CN101473177A

CN101473177A - Air conditioner

Info

Publication number: CN101473177A
Application number: CNA2007800233194A
Authority: CN
Inventors: 西村忠史; 笠原伸一; 山口贵弘
Original assignee: Daikin Industries Ltd
Current assignee: Daikin Industries Ltd
Priority date: 2006-06-26
Filing date: 2007-06-22
Publication date: 2009-07-01
Anticipated expiration: 2027-06-22
Also published as: KR101207004B1; US20090100849A1; AU2007264431A1; EP2034261A4; WO2008001687A1; CN101473177B; KR20090027223A; EP2034261A1; JP2008002786A; AU2007264431B2; JP4155313B2

Abstract

The labor of inputting information on a refrigerant communication pipe before operating a separate type air conditioner is minimized, and at the same time, the adequacy of the refrigerant quantity in a refrigerant circuit can be judged with high accuracy. An air conditioner (1) includes a pipe volume calculating means and a refrigerant circuit (10) configured by the interconnection of a heat source unit (2) and a utilization unit (4, 5) via a refrigerant communication pipe (6, 7). The pipe volume calculating means calculates the volume (Vlp, Vgp) of the refrigerant communication pipe (6, 7) based on an additional charging quantity (Ma) which is a refrigerant quantity to be additionally charged after the refrigerant circuit (10) is configured by interconnecting the heat source unit (2) and the utilization unit (4, 5) via the refrigerant communication pipe (6, 7).

Description

Aircondition

Technical field

The present invention relates to the suitable function of judging whether of the refrigerant amount in the refrigerant loop of aircondition, relate in particular to by heat source unit with utilize the unit to be communicated with the refrigerant amount suitable function of judging whether in the refrigerant loop of the aircondition that pipe arrangement connects and composes by cold-producing medium.

Background technology

In the past, by heat source unit with utilize the unit to be communicated with by cold-producing medium in the split-type air conditioner device that pipe arrangement is formed by connecting, for can judge accurately in the refrigerant loop refrigerant amount too much or not enough and the input cold-producing medium is communicated with the information such as length (for example with reference to patent documentation 1) of pipe arrangement.

Patent documentation 1: Japanese patent laid-open 8-200905 communique

But the operation that above-mentioned input cold-producing medium is communicated with the information of pipe arrangement extremely bothers, and also has the problem that is easy to generate input error simultaneously.

Summary of the invention

The objective of the invention is to reduce the trouble of input cold-producing medium connection pipe arrangement information before the operation of split-type air conditioner device, and can judge accurately whether the refrigerant amount in the refrigerant loop is suitable.

The aircondition of the 1st invention comprises: by heat source unit with utilize the unit to be connected refrigerant loop and the pipe arrangement volume arithmetic unit that constitutes by cold-producing medium connection pipe arrangement.Pipe arrangement volume arithmetic unit comes the computing cold-producing medium to be communicated with the volume of pipe arrangement based on appending loading, and the described loading that appends is meant that being communicated with pipe arrangement by cold-producing medium connects heat source unit and utilize the unit to constitute the refrigerant amount that is added filling behind the refrigerant loop.

In above-mentioned aircondition, based on appending loading, promptly being communicated with pipe arrangement connection heat source unit and utilizing the unit to constitute the refrigerant amount that is added filling behind the refrigerant loop by cold-producing medium, come the computing cold-producing medium to be communicated with the volume of pipe arrangement, therefore, even be communicated with the volume of pipe arrangement when unknown, also can come the computing cold-producing medium to be communicated with the volume of pipe arrangement by the value that loading is appended in input at cold-producing medium.Thus, can in the trouble that reduces input cold-producing medium connection pipe arrangement information, obtain the volume that cold-producing medium is communicated with pipe arrangement, consequently, can judge accurately whether the refrigerant amount in the refrigerant loop is suitable.

The aircondition of the 2nd invention is in the aircondition of the 1st invention, also comprise the determining amount of refrigerant device, this determining amount of refrigerant device is filled the cold-producing medium that flows in service or the running status amount of constitution equipment automatically based on cold-producing medium being appended the cold-producing medium that is filled in the refrigerant loop in refrigerant loop, judge whether the refrigerant amount that is filled in the refrigerant loop has reached the target loading.Appending loading is to fill the refrigerant amount that is filled in the refrigerant loop that is added in service automatically at cold-producing medium.

In above-mentioned aircondition, can judge whether reached the target loading based on the cold-producing medium that in refrigerant loop, flows or the running status amount of constitution equipment, therefore, can carry out the filling of appending of cold-producing medium reliably, and can fill the required value of appending loading of volume that operation obtains computing cold-producing medium connection pipe arrangement automatically by carrying out cold-producing medium.

The aircondition of the 3rd invention comprises: by heat source unit with utilize the unit to be connected refrigerant loop and the pipe arrangement volume arithmetic unit that constitutes by cold-producing medium connection pipe arrangement.Pipe arrangement volume arithmetic unit comes the computing cold-producing medium to be communicated with the volume of pipe arrangement based on being communicated with the pipe arrangement refrigerant amount, described connection pipe arrangement refrigerant amount be meant from appending filled the refrigerant amount of refrigerant loop integral body behind the cold-producing medium, be deduct the integral-filled refrigerant amount refrigerant loop remove refrigerant amount that cold-producing medium is communicated with the part the pipe arrangement, be unit inner refrigerant amount and refrigerant amount in the cold-producing medium connection pipe arrangement that obtains.

In above-mentioned aircondition, based on be communicated with the pipe arrangement refrigerant amount, promptly filled the refrigerant amount of refrigerant loop integral body behind the cold-producing medium from appending, be deduct the integral-filled refrigerant amount refrigerant loop remove refrigerant amount that cold-producing medium is communicated with the part the pipe arrangement, be unit inner refrigerant amount and refrigerant amount in the cold-producing medium connection pipe arrangement that obtains, come the computing cold-producing medium to be communicated with the volume of pipe arrangement, therefore, even be communicated with the volume of pipe arrangement when unknown, also can come the computing cold-producing medium to be communicated with the volume of pipe arrangement by the value that loading is appended in input at cold-producing medium.Thus, can in the trouble that reduces input cold-producing medium connection pipe arrangement information, obtain the volume that cold-producing medium is communicated with pipe arrangement, consequently, can judge accurately whether the refrigerant amount in the refrigerant loop is suitable.

The aircondition of the 4th invention is in the aircondition of the 2nd invention, also comprise the refrigerant amount arithmetic unit, this refrigerant amount arithmetic unit is automatically filled the cold-producing medium that flows in service or the running status amount of constitution equipment according to cold-producing medium in refrigerant loop, come the computing refrigerant loop the refrigerant amount that removes the part the cold-producing medium connection pipe arrangement, be unit inner refrigerant amount.Pipe arrangement volume arithmetic unit is by being filled into the refrigerant amount in the refrigerant loop before cold-producing medium is filled operation automatically, be to add on the initial refrigerant amount that appending loading obtains the refrigerant amount that cold-producing medium is filled the refrigerant loop integral body after operation has just been finished automatically, it is integral-filled refrigerant amount, obtain cold-producing medium and be communicated with refrigerant amount in the pipe arrangement by from integral-filled refrigerant amount, deducting unit inner refrigerant amount, promptly be communicated with the pipe arrangement refrigerant amount, the density of coming the cold-producing medium that computing flows according to the running status amount of cold-producing medium that in refrigerant loop, flows or constitution equipment in cold-producing medium is communicated with pipe arrangement, and come the computing cold-producing medium to be communicated with the volume of pipe arrangement based on being communicated with pipe arrangement refrigerant amount and density.

In above-mentioned aircondition, by filling the unit inner refrigerant amount that the running status amount of cold-producing medium that flows in service or constitution equipment is carried out computing automatically in refrigerant loop from adding at pre-filled volume to append to deduct the integral-filled refrigerant amount that loading obtains according to cold-producing medium, connection pipe arrangement refrigerant amount when the computing cold-producing medium is filled operation automatically accurately, therefore, the computing cold-producing medium is communicated with the volume of pipe arrangement accurately.

The aircondition of the 5th invention is in the aircondition of the 4th invention, and cold-producing medium is communicated with pipe arrangement and comprises that liquid refrigerant is communicated with pipe arrangement and gas refrigerant is communicated with pipe arrangement.Pipe arrangement volume arithmetic unit to the density that is communicated with flowing liquid cold-producing medium in the pipe arrangement at liquid refrigerant, be liquid refrigerant density and the gas refrigerant that in gas refrigerant is communicated with pipe arrangement, flows density, be that gas refrigerant density is carried out computing, be communicated with volumetric ratio, liquid refrigerant density and gas refrigerant density between pipe arrangement with gas refrigerant based on connection pipe arrangement refrigerant amount, liquid refrigerant connection pipe arrangement, come the computing liquid refrigerant to be communicated with the volume of pipe arrangement and gas refrigerant connection pipe arrangement.

Because being arranged for to be connected with gas refrigerant connection pipe arrangement, liquid refrigerant connection pipe arrangement utilizes unit and heat source unit, therefore piping length is roughly the same, because the density difference of mobile cold-producing medium in pipe, so the pipe arrangement diameter, be the flow path cross sectional area difference.Therefore, it is roughly corresponding with the ratio of both flow path cross sectional areas with the volumetric ratio that gas refrigerant is communicated with between pipe arrangement that liquid refrigerant is communicated with pipe arrangement, and the ratio of flow path cross sectional area depends on ability, the form of utilizing unit and heat source unit, therefore, this volumetric ratio is the value in certain scope.If it is known that liquid refrigerant is communicated with the volumetric ratio that pipe arrangement is communicated with between pipe arrangement with gas refrigerant, then the volume of liquid refrigerant connection pipe arrangement is multiplied by value and value sum after the volume of gas refrigerant connection pipe arrangement is multiplied by gas refrigerant density after the liquid refrigerant density with to be communicated with the pipe arrangement refrigerant amount identical.Consequently, the computing liquid refrigerant be can distinguish and the volume of pipe arrangement and the volume that gas refrigerant is communicated with pipe arrangement are communicated with.

Therefore, in above-mentioned aircondition, be communicated with pipe arrangement and be communicated with volumetric ratio between pipe arrangement with gas refrigerant, can distinguish the volume of computing liquid refrigerant connection pipe arrangement and the volume of gas refrigerant connection pipe arrangement simply by preestablishing liquid refrigerant.

The aircondition of the 6th invention is in the aircondition of the 4th invention or the 5th invention, the cold-producing medium arithmetic unit is communicated with the volume of pipe arrangement based on the cold-producing medium that calculated by pipe arrangement volume arithmetic unit and to having or not cold-producing medium to leak the cold-producing medium leak detection of the judging cold-producing medium that flows in service or the running status amount of constitution equipment from refrigerant loop in refrigerant loop, come computing refrigerant loop integral body refrigerant amount, be the integral operation refrigerant amount.The determining amount of refrigerant device is judged to have or not cold-producing medium to leak from refrigerant loop by having or not cold-producing medium to compare from the benchmark refrigerant amount of the benchmark of refrigerant loop leakage to the integral operation refrigerant amount with as judgement.

In above-mentioned aircondition, can utilize pipe arrangement volume arithmetic unit to come the computing cold-producing medium to be communicated with the volume of pipe arrangement, therefore, even when cold-producing medium was communicated with volume the unknown of pipe arrangement, the volume that also can use the cold-producing medium that is calculated by pipe arrangement volume arithmetic unit to be communicated with pipe arrangement came the computing cold-producing medium leak detection refrigerant amount in refrigerant loop in service.Thus, can when reducing the trouble that the input cold-producing medium is communicated with pipe arrangement information, judge accurately and have or not cold-producing medium to leak from refrigerant loop.

The aircondition of the 7th invention is in the aircondition of the 2nd invention, pipe arrangement volume arithmetic unit comes computing mobile cold-producing medium in cold-producing medium is communicated with pipe arrangement based on the running status amount of cold-producing medium that flows or constitution equipment in refrigerant loop density, and based on appending the volume that loading and density are come computing cold-producing medium connection pipe arrangement.

In above-mentioned aircondition, for example, refrigerant amount by in advance will be in refrigerant loop is filled operation approximate quantity of removing refrigerant amount that cold-producing medium is communicated with the part the pipe arrangement, unit inner refrigerant amount of refrigerant loop when having reached the target loading automatically by cold-producing medium cold-producing medium is filled into cold-producing medium as initial cold-producing medium and fills automatically in the refrigerant loop before operation is carried out, the automatic filling of the cold-producing medium refrigerant amount that is filled in the refrigerant loop that is added in service can be regarded as with to be present in the refrigerant amount that cold-producing medium is communicated with in the pipe arrangement suitable.Thus, can come the volume of computing cold-producing medium connection pipe arrangement accurately based on appending loading and density.

The aircondition of the 8th invention is in the aircondition of the 7th invention, and cold-producing medium is communicated with pipe arrangement and comprises that liquid refrigerant is communicated with pipe arrangement and gas refrigerant is communicated with pipe arrangement.Pipe arrangement volume arithmetic unit to the density that is communicated with flowing liquid cold-producing medium in the pipe arrangement at liquid refrigerant, be liquid refrigerant density and the gas refrigerant that in gas refrigerant is communicated with pipe arrangement, flows density, be that gas refrigerant density is carried out computing, be communicated with pipe arrangement and be communicated with volumetric ratio, liquid refrigerant density and gas refrigerant density between pipe arrangement with gas refrigerant based on appending loading, liquid refrigerant, come the volume of computing liquid refrigerant connection pipe arrangement and gas refrigerant connection pipe arrangement.

Because being arranged for to be connected with gas refrigerant connection pipe arrangement, liquid refrigerant connection pipe arrangement utilizes unit and heat source unit, therefore piping length is roughly the same, because the density difference of mobile cold-producing medium in pipe, so the pipe arrangement diameter, be the flow path cross sectional area difference.Therefore, it is roughly corresponding with the ratio of both flow path cross sectional areas with the volumetric ratio that gas refrigerant is communicated with between pipe arrangement that liquid refrigerant is communicated with pipe arrangement, and the ratio of flow path cross sectional area depends on ability, the form of utilizing unit and heat source unit, therefore, this volumetric ratio is the value in certain scope.If the volumetric ratio that liquid refrigerant connection pipe arrangement is communicated with between pipe arrangement with gas refrigerant is known, then the liquid refrigerant volume that is communicated with pipe arrangement is multiplied by volume that value and gas refrigerant after the liquid refrigerant density be communicated with pipe arrangement and is multiplied by the value sum after the gas refrigerant density and appends loading identical, consequently, the computing liquid refrigerant be can distinguish and the volume of pipe arrangement and the volume that gas refrigerant is communicated with pipe arrangement are communicated with.

The aircondition of the 9th invention is in the aircondition of the 7th invention or the 8th invention, also comprise the refrigerant amount arithmetic unit, this cold-producing medium arithmetic unit is communicated with the volume of pipe arrangement based on the cold-producing medium that calculated by pipe arrangement volume arithmetic unit and to having or not cold-producing medium to leak the cold-producing medium leak detection of the judging cold-producing medium that flows in service or the running status amount of constitution equipment from refrigerant loop in refrigerant loop, the refrigerant amount that comes computing refrigerant loop integral body is the integral operation refrigerant amount.The determining amount of refrigerant device is judged to have or not cold-producing medium to leak from refrigerant loop by having or not cold-producing medium to compare from the benchmark refrigerant amount of the benchmark of refrigerant loop leakage to the integral operation refrigerant amount with as judgement.

Description of drawings

Fig. 1 is the summary construction diagram of the aircondition of the present invention's one example.

Fig. 2 is the controlling party block diagram of aircondition.

Fig. 3 is the flow chart of test/trial running mode.

Fig. 4 is the flow chart that cold-producing medium is filled operation automatically.

Fig. 5 is the schematic diagram (four-way switching valve etc. are not shown) of the state of the expression determining amount of refrigerant cold-producing medium that flows in refrigerant loop in service.

Fig. 6 is the flow chart of pipe arrangement volume calculation process.

Fig. 7 is the flow chart of cold-producing medium leak detection operational mode.

(symbol description)

1 aircondition

2 outdoor units (heat source unit)

4,5 indoor units (utilizing the unit)

6 liquid refrigerants are communicated with pipe arrangement (cold-producing medium connection pipe arrangement)

7 gas refrigerants are communicated with pipe arrangement (cold-producing medium connection pipe arrangement)

10 refrigerant loops

The specific embodiment

Example to aircondition of the present invention describes with reference to the accompanying drawings.

(1) structure of aircondition

Fig. 1 is the summary construction diagram of the aircondition 1 of the present invention's one example.Aircondition 1 is to move the indoor refrigeration that is used for building etc., the device of heating by the kind of refrigeration cycle of carrying out steam compression type.Aircondition 1 mainly comprises: the outdoor unit 2 as heat source unit; With its a plurality of (in this example being two) that is connected side by side as the indoor unit 4,5 that utilizes the unit; And the liquid refrigerant as cold-producing medium connection pipe arrangement that connects outdoor unit 2 and indoor unit 4,5 is communicated with pipe arrangement 6 and gas refrigerant is communicated with pipe arrangement 7.That is, the steam compression type refrigeration agent loop 10 of the aircondition 1 of this example is formed by connecting by outdoor unit 2, indoor unit 4,5 and liquid refrigerant connection pipe arrangement 6 and gas refrigerant connection pipe arrangement 7.

＜indoor unit 〉

Indoor unit 4,5 is by hanging oneself inferior or be hung on that indoor wall is first-class to be provided with in the indoor ceiling of imbedding building etc. or from ceiling.Indoor unit 4,5 is communicated with pipe arrangement 6 by liquid refrigerant and is connected with outdoor unit 2 with gas refrigerant connection pipe arrangement 7, constitutes the part of refrigerant loop 10.

Structure to indoor unit 4,5 describes below.Because indoor unit 4 is identical with the structure of indoor unit 5, therefore only the structure of indoor unit 4 is described at this, as for the structure of indoor unit 5, the symbol of No. 40 sections of expression indoor unit 4 each several parts is marked the symbol of No. 50 sections, the explanation of omitting each several part respectively.

Indoor unit 4 mainly has the indoor refrigerant loop 10a (being indoor refrigerant loop 10b in indoor unit 5) of a part that constitutes refrigerant loop 10.This indoor refrigerant loop 10a mainly has as the indoor expansion valve 41 of expansion mechanism with as the indoor heat converter 42 that utilizes the side heat exchanger.

In this example, indoor expansion valve 41 is the electric expansion valves that are connected with the hydraulic fluid side of indoor heat converter 42 for the flow of the cold-producing medium that flows in the refrigerant loop 10a of indoor being regulated etc.

In this example, indoor heat converter 42 is the finned fin-tube heat exchangers of intersection that are made of heat-transfer pipe and a large amount of fins, is to play a role as the evaporimeter of cold-producing medium when refrigerating operaton and heat exchanger that room air is cooled off, plays a role as the condenser of cold-producing medium when the heating operation and room air is heated.

In this example, indoor unit 4 has the indoor fan 43 as Air Blast fan, this indoor fan 43 is used for room air is drawn in the unit and makes it carry out heat exchange with cold-producing medium in indoor heat converter 42, and after with its as air supply to indoor supply.Indoor fan 43 is the fans that can change the air quantity Wr of the air that indoor heat converter 42 is supplied with, and is the centrifugal fan that drives of the motor 43a that is subjected to be made of dc fan motor and multi blade fan etc. in this example.

In indoor unit 4, be provided with various sensors.Be provided with the hydraulic fluid side temperature sensor 44 that temperature to cold-producing medium (the corresponding refrigerant temperature of evaporating temperature Te when condensation temperature Tc during promptly with heating operation or refrigerating operaton) detects in the hydraulic fluid side of indoor heat converter 42.Be provided with the gas side temperature sensor 45 that the temperature T eo to cold-producing medium detects at the gas side of indoor heat converter 42.Be provided with convection current at the suction oral-lateral of the room air of indoor unit 4 and go into the indoor temperature transmitter 46 that the temperature of the room air in the indoor unit (being indoor temperature Tr) detects.In this example, hydraulic fluid side temperature sensor 44, gas side temperature sensor 45 and indoor temperature transmitter 46 are made of thermistor.Indoor unit 4 has the indoor control part 47 that the action of the each several part that constitutes indoor unit 4 is controlled.Indoor control part 47 has in order to control indoor unit 4 microcomputer that is provided with and memory etc., can and be used for operating separately carrying out between the remote controller (not shown) of indoor unit 4 exchange of control signal etc., or and outdoor unit 2 between carry out the exchange of control signal etc. by transmission line 8a.

＜outdoor unit 〉

Outdoor unit 2 is arranged on the outdoor of building etc., is communicated with pipe arrangement 6 and gas refrigerant by liquid refrigerant and is communicated with pipe arrangement 7 and is connected formation refrigerant loop 10 between indoor unit 4,5 with indoor unit 4,5.

Structure to outdoor unit 2 describes below.Outdoor unit 2 mainly has the outside refrigerant loop 10c of a part that constitutes refrigerant loop 10.This outside refrigerant loop 10c mainly has: compressor 21, four-way switching valve 22, as the outdoor heat converter 23 of heat source side heat exchanger, the outdoor expansion valve 38, accumulator 24 as expansion mechanism, subcooler 25, hydraulic fluid side stop valve 26 and the gas side stop valve 27 as thermoregulation mechanism.

Compressor 21 is the compressors that can change working capacity, is the positive displacement compressor that is driven by motor 21a in this example, and the rotating speed Rm of this motor 21a is controlled by converter.In this example, compressor 21 is one, but is not limited thereto, also can be according to connection number of indoor unit etc. and connect compressor more than two side by side.

Four-way switching valve 22 is the valves that are used to switch direction of refrigerant flow, when refrigerating operaton, in order to make outdoor heat converter 23 as being played a role by the condenser of compressor 21 refrigerant compressed and making indoor heat converter 42,52 evaporimeters as the cold-producing medium that is condensed in outdoor heat converter 23 play a role, the gas side of the discharge side of compressor 21 and outdoor heat converter 23 can be connected and the suction side (particularly being accumulator 24) of compressor 21 is communicated with pipe arrangement 7 sides with gas refrigerant and be connected (with reference to the solid line of the four-way switching valve among Fig. 1 22), when heating operation, in order to make indoor heat converter 42,52 as being played a role by the condenser of compressor 21 refrigerant compressed and making outdoor heat converter 23 conducts at outdoor heat converter 42, the evaporimeter of the cold-producing medium that is condensed in 52 plays a role, and the discharge side of compressor 21 and gas refrigerant can be communicated with pipe arrangement 7 sides and be connected and the suction side of compressor 21 and the gas side of outdoor heat converter 23 are connected (with reference to the dotted line of the four-way switching valve among Fig. 1 22).

In this example, outdoor heat converter 23 is the finned fin-tube heat exchangers of intersection that are made of heat-transfer pipe and a large amount of fins, is the heat exchanger that the condenser as cold-producing medium plays a role, plays a role as the evaporimeter of cold-producing medium when heating operation when refrigerating operaton.The gas side of outdoor heat converter 23 is connected with four-way switching valve 22, and the hydraulic fluid side is communicated with pipe arrangement 6 with liquid refrigerant and is connected.

In this example, outdoor expansion valve 38 is the electric expansion valves that are connected with the hydraulic fluid side of outdoor heat converter 23 for the pressure of the cold-producing medium that flows in the refrigerant loop 10c of outside and flow etc. are regulated.

In this example, outdoor unit 2 has the outdoor fan 28 as Air Blast fan, and this outdoor fan 28 is used for outdoor air is drawn in the unit and makes it carry out heat exchange with cold-producing medium in outdoor heat converter 23, and after with it to outdoor discharge.This outdoor fan 28 is the fans that can change the air quantity Wo of the air that outdoor heat converter 23 is supplied with, and is the propeller fan that drives of the motor 28a that is subjected to be made of dc fan motor etc. in this example.

Accumulator 24 is connected between four-way switching valve 22 and the compressor 21, is the container that can store the residual refrigerant that produces because of the change of the running load of indoor unit 4,5 etc. in refrigerant loop 10.

In this example, subcooler 25 is dual tubing heat exchanger, is provided with for the cold-producing medium that is sent to

indoor expansion valve

41,51 after the condensation in outdoor heat converter 23 is cooled off.In this example, subcooler 25 is connected between outdoor expansion valve 38 and the hydraulic fluid side stop valve 26.

In this example, be provided with bypass refrigerant loop 61 as the cooling source of subcooler 25.In the following description, for convenience the part except that bypass refrigerant loop 61 in the refrigerant loop 10 is called main refrigerant circuit.

Bypass refrigerant loop 61 is so that be sent to the part of the cold-producing medium of indoor expansion valve 41,51 and return the form of the suction side of compressor 21 from main refrigerant circuit shunting and be connected with main refrigerant circuit from outdoor heat converter 23.Particularly, bypass refrigerant loop 61 has: so that be sent to shunting circuit 61a that form that the part of the cold-producing medium of indoor expansion valve 41,51 shunts in outdoor heat converter 23 and the position between the subcooler 25 is connected and the loop 61b that confluxes that is connected with the suction side of compressor 21 with the form of returning towards the suction side of compressor 21 from the outlet by bypass refrigerant loop side of subcooler 25 from outdoor expansion valve 38.Be provided with bypass expansion valve 62 on shunting circuit 61a, this bypass expansion valve 62 is used for the flow of the cold-producing medium that flows in bypass refrigerant loop 61 is regulated.At this, bypass expansion valve 62 is made of electric expansion valve.Thus, be sent to the cold-producing medium refrigerant cools that quilt flows in subcooler 25 of indoor expansion valve 41,51 in by bypass expansion valve 62 post-decompression bypass refrigerant loops 61 from outdoor heat converter 23.That is, subcooler 25 is regulated the ability of carrying out control by the aperture of bypass expansion valve 62.

Hydraulic fluid side stop valve 26 and gas side stop valve 27 be provided in a side of with external equipment, pipe arrangement (particularly being that liquid refrigerant is communicated with pipe arrangement 6 and gas refrigerant is communicated with pipe arrangement 7) between connector on valve.Hydraulic fluid side stop valve 26 is connected with outdoor heat converter 23.Gas side stop valve 27 is connected with four-way switching valve 22.

On outdoor unit 2, be provided with various sensors.Particularly, on outdoor unit 2, be provided with: the suction pressure sensor 29 that the suction pressure Ps of compressor 21 is detected, the discharge pressure sensor 30 that the discharge pressure Pd of compressor 21 is detected, the inlet temperature sensor 31 that the inlet temperature Ts of compressor 21 is detected and the discharge temperature sensor 32 that the discharge temperature Td of compressor 21 is detected.Inlet temperature sensor 31 is located on the position between accumulator 24 and the compressor 21.Be provided with the heat exchange temperature sensor 33 that temperature to the cold-producing medium that flows (the corresponding refrigerant temperature of evaporating temperature Te when condensation temperature Tc during promptly with refrigerating operaton or heating operation) detects on the outdoor heat converter 23 in outdoor heat converter 23.Be provided with the hydraulic fluid side temperature sensor 34 that the temperature T co to cold-producing medium detects in the hydraulic fluid side of outdoor heat converter 23.The outlet by the main refrigerant circuit side at subcooler 25 is provided with the fluid pipeline temperature sensor 35 that the temperature (being fluid pipeline temperature T lp) to cold-producing medium detects.Be provided with bypass temperature sensor 63 on the loop 61b that confluxes of bypass refrigerant loop 61, this bypass temperature sensor 63 is used for the temperature of the cold-producing medium that flows through from the outlet by bypass refrigerant loop side of subcooler 25 is detected.Suction oral-lateral at the outdoor air of outdoor unit 2 is provided with the outdoor temperature sensor 36 that the temperature (being outdoor temperature Ta) that flows into the outdoor air in the unit is detected.In this example, inlet temperature sensor 31, discharge temperature sensor 32, heat exchange temperature sensor 33, hydraulic fluid side temperature sensor 34, fluid pipeline temperature sensor 35, outdoor temperature sensor 36 and bypass temperature sensor 63 are made of thermistor.Outdoor unit 2 has the outside control part 37 that the action of the each several part that constitutes outdoor unit 2 is controlled.Outside control part 37 has the converter loop of the microcomputer, memory and the control motor 21a that are provided with for the control of carrying out outdoor unit 2 etc., carries out the exchange of control signal etc. between can the indoor control part 47,57 by transmission line 8a and indoor unit 4,5.That is, constitute the control part 8 that aircondition 1 integral body is moved control by indoor control part 47,57, outside control part 37 with control part 37,47,57 transmission line 8a connected to one another.

As shown in Figure 2, control part 8 connects into the detection signal that can receive various sensors 29～36,44～46,54～56,63, and connects into to wait based on these signals and control various device and

valve

21,22,24,28a, 38,41,43a, 51,53a, 62.Control part 8 is provided with input part 9a, with the input and the change of the setting value that can carry out various control usefulness, perhaps input comprises that filling operation automatically by following cold-producing medium appends the refrigerant amount that is filled in the refrigerant loop 10 and the integral-filled refrigerant amount of initial refrigerant amount.On control part 8, be connected with the alarm display part 9b that constitutes by LED etc., this alarm display part 9b is used to report automatically fill at following cold-producing medium and in servicely appends filling and finish, perhaps reports at the following cold-producing medium leak detection cold-producing medium that detects in service and leaks.At this, Fig. 2 is the controlling party block diagram of aircondition 1.Input part 9a is not limited to be arranged on the control part 8, also can be connected with control part 8 as required when loading or integral-filled amount are appended in input.

＜cold-producing medium is communicated with pipe arrangement 〉

Cold-producing medium is communicated with pipe arrangement the 6, the 7th, aircondition 1 is being arranged at the refrigerant piping of constructing at the scene when building etc. is provided with the place, can the pipe arrangement that condition is used all lengths and caliber be set according to combination between place and outdoor unit and the indoor unit etc. is set.Therefore, for example when newly aircondition being set,, need accurately to hold cold-producing medium and be communicated with information such as the length of

pipe arrangement

6,7 and caliber, and the calculating of this information management and refrigerant amount itself being very loaded down with trivial details in order to calculate the loading that appends of cold-producing medium.Utilizing establishing pipe to upgrade the occasion of indoor unit and outdoor unit and so on, cold-producing medium is communicated with information such as the length of

pipe arrangement

6,7 and caliber and loses sometimes.

As mentioned above,

indoor refrigerant loop

10a, 10b, outside refrigerant loop 10c and cold-producing medium are communicated with

pipe arrangement

6,7 connections and the refrigerant loop 10 of formation aircondition 1.In addition, this refrigerant loop 10 also can be described as and is made of bypass refrigerant loop 61 and the main refrigerant circuit except that bypass refrigerant loop 61.The aircondition 1 of this example utilize the control part 8 that constitutes by

indoor control part

47,57 and outside control part 37 and by four-way switching valve 22 and between refrigerating operaton and heating operation switchover operation, and control each equipment of outdoor unit 2 and indoor unit 4,5 according to the running load of each indoor unit 4,5.

(2) action of aircondition

Action to the aircondition 1 of this example describes below.

Operational mode as the aircondition 1 of this example comprises: the common operational mode of controlling the constitution equipment of outdoor unit 2 and indoor unit 4,5 according to the running load of each indoor unit 4,5; The test/trial running mode of the trial run usefulness that (particularly be not limited to after the initial equipment setting, for example also comprise after the transformations such as constitution equipment to indoor unit etc. appends and removes, after equipment fault has been carried out repairing etc.) carries out after the constitution equipment setting of aircondition 1; And after finishing and begin operation usually, trial run have or not cold-producing medium to leak the cold-producing medium leak detection operational mode of judging to refrigerant loop 10.Usually operational mode mainly comprises to the indoor refrigerating operaton that freezes with to the indoor heating operation that heats.Test/trial running mode mainly comprises: the cold-producing medium of filling cold-producing medium in refrigerant loop 10 is filled operation automatically and cold-producing medium is communicated with the pipe arrangement volume calculation process that the volume of

pipe arrangement

6,7 carries out computing.

Action under each operational mode describes to aircondition 1 below.

＜common operational mode 〉

(refrigerating operaton)

At first the refrigerating operaton under the common operational mode is described with Fig. 1 and Fig. 2.

When refrigerating operaton, four-way switching valve 22 is in the state shown in the solid line among Fig. 1, and the discharge side that promptly becomes compressor 21 is connected with the gas side of outdoor heat converter 23 and the suction side of compressor 21 is communicated with the state that pipe arrangement 7 is connected with the gas side of indoor heat converter 42,52 by gas side stop valve 27 and gas refrigerant.Outdoor expansion valve 38 is in full-gear.Hydraulic fluid side stop valve 26 and gas side stop valve 27 are in open mode.Each indoor expansion valve 41,51 is carried out aperture regulate, so that the degree of superheat SHr of the cold-producing medium that indoor heat converter 42,52 outlets (being the gas side of indoor heat converter 42,52) are located is stabilized in degree of superheat desired value SHr2.In this example, each indoor heat converter 42, the degree of superheat SHr of the cold-producing medium in 52 exits passes through from using hydraulic fluid side temperature sensor 14, deduct in the 55 detected refrigerant temperature values with hydraulic fluid side temperature sensor 44,54 detected refrigerant temperature values (Te is corresponding with evaporating temperature) detect, or by being converted into the saturation temperature value corresponding with evaporating temperature Te with the suction pressure Ps of the detected compressor 21 of suction pressure sensor 29, and from using gas side temperature sensor 45, the saturation temperature value that deducts this cold-producing medium in the 55 detected refrigerant temperature values detects.Though in this example, do not adopt, but the temperature sensor that the temperature to the cold-producing medium that flows detects can be set also in each indoor heat converter 42,52, by will with the corresponding refrigerant temperature value of the detected evaporating temperature Te of this temperature sensor from deducting the detected refrigerant temperature value of gas side temperature sensor 45,55, detect the degree of superheat SHr of the cold-producing medium in each indoor heat converter 42,52 exit.In addition, bypass expansion valve 62 is carried out aperture regulate, so that the degree of superheat SHb of the cold-producing medium in the exit of leaning on bypass refrigerant loop side of subcooler 25 becomes degree of superheat desired value SHbs.In this example, subcooler 25 by the degree of superheat SHb in the exit of bypass refrigerant loop side by being converted into the saturation temperature value corresponding with the suction pressure Ps of the detected compressor 21 of suction pressure sensor 29 and from detecting with the saturation temperature value that deducts this cold-producing medium the detected refrigerant temperature value of bypass temperature sensor 63 with evaporating temperature Te.Though in this example, do not adopt, but also can subcooler 25 by the inlet of bypass refrigerant side temperature sensor is set, by will be with the detected refrigerant temperature value of this temperature sensor from the degree of superheat SHb that deducts the cold-producing medium in the exit of leaning on the bypass refrigerant side of detecting subcooler 25 the detected refrigerant temperature value of bypass temperature sensor 63.

When starting compressor 21, outdoor fan 28 and indoor fan 43,53 under the state of this refrigerant loop 10, the gas refrigerant of low pressure is sucked and is collapsed into the gas refrigerant of high pressure by compressor 21.Afterwards, the gas refrigerant of high pressure is sent to outdoor heat converter 23 via four-way switching valve 22, carries out heat exchange with the outdoor air of being supplied with by outdoor fan 28, thereby is condensed into the liquid refrigerant of high pressure.Then, the liquid refrigerant of this high pressure flows through outdoor expansion valve 38 and flows in the subcooler 25, carries out heat exchange with the cold-producing medium that flows in bypass refrigerant loop 61, becomes supercooled state thereby be further cooled.At this moment, the part of the high pressure liquid refrigerant of condensation is shunted to bypass refrigerant loop 61 in outdoor heat converter 23, and returns the suction side of compressor 21 after being reduced pressure by bypass expansion valve 62.At this, the cold-producing medium that flows through bypass expansion valve 62 is depressurized to the suction pressure Ps near compressor 21, thereby its part evaporation.In addition, the cold-producing medium that flows towards the suction side of compressor 21 from the outlet of the bypass expansion valve 62 of bypass refrigerant loop 61 flows through subcooler 25, and the high pressure liquid refrigerant that is sent to indoor unit 4,5 with outdoor heat converter 23 from the main refrigerant circuit side carries out heat exchange.

Then, the high pressure liquid refrigerant that becomes supercooled state is communicated with pipe arrangement 6 via hydraulic fluid side stop valve 26 and liquid refrigerant and is sent to indoor unit 4,5.This high pressure liquid refrigerant that is sent to indoor unit 4,5 is sent to indoor heat converter 42,52 behind the cold-producing medium that is decompressed to the gas-liquid two-phase state that becomes low pressure near the suction pressure Ps of compressor 21 by

indoor expansion valve

41,51, in indoor heat converter 42,52, carry out heat exchange, thereby flash to the gas refrigerant of low pressure with room air.

The gas refrigerant of this low pressure is communicated with pipe arrangement 7 via gas refrigerant and is sent to outdoor unit 2, and flows in the accumulator 24 via gas side stop valve 27 and four-way switching valve 22.Then, the low-pressure refrigerant gas that flows in the accumulator 24 is sucked by compressor 21 once more.

(heating operation)

Below the heating operation under the common operational mode is described.

When heating operation, four-way switching valve 22 is in the state shown in the dotted line among Fig. 1, and the discharge side that promptly becomes compressor 21 is communicated with pipe arrangement 7 by gas side stop valve 27 with gas refrigerant and is connected with the gas side of indoor heat converter 42,52 and state that the suction side of compressor 21 is connected with the gas side of outdoor heat converter 23.Outdoor expansion valve 38 is carried out aperture regulate for the cold-producing medium in the inflow outdoor heat exchanger 23 is decompressed to the pressure (being evaporating pressure Pe) that can evaporate in outdoor heat converter 23.Hydraulic fluid side stop valve 26 and gas side stop valve 27 are in open mode.Indoor expansion valve 41,51 is carried out aperture regulate, so that the degree of supercooling SCr of the cold-producing medium in indoor heat converter 42,52 exits is stabilized in degree of supercooling desired value SCrs.In this example, the degree of supercooling SCr of the cold-producing medium in indoor heat converter 42,52 exits detects by being converted into the saturation temperature value corresponding with condensation temperature Tc with the discharge pressure Pd of discharge pressure sensor 30 detected compressors 21 and deducting from the saturation temperature value of this cold-producing medium with hydraulic fluid side temperature sensor 44,54 detected refrigerant temperature values.Though in this example, do not adopt, but the temperature sensor that the temperature to the cold-producing medium that flows in each indoor heat converter 42,52 detects also can be set, by will with the corresponding refrigerant temperature value of the detected condensation temperature Tc of this temperature sensor from the degree of supercooling SCr that deducts the cold-producing medium that detects indoor heat converter 42,52 exits the detected refrigerant temperature value of hydraulic fluid side temperature sensor 44,54.In addition, bypass expansion valve 62 is closed.

When under the state of this refrigerant loop 10, starting compressor 21, outdoor fan 28 and indoor fan 43,53, the gas refrigerant of low pressure is sucked and is collapsed into the gas refrigerant of high pressure by compressor 21, and is communicated with pipe arrangement 7 via four-way switching valve 22, gas side stop valve 27 and gas refrigerant and is sent to indoor unit 4,5.

Then, the high-pressure gas refrigerant that is sent to indoor unit 4,5 carries out heat exchange with room air and is condensed into the liquid refrigerant of high pressure in indoor heat converter 42,52, afterwards, when flowing through

indoor expansion valve

41,51, be depressurized accordingly with the valve opening of

indoor expansion valve

41,51.

This cold-producing medium that flows through behind the

indoor expansion valve

41,51 is sent to outdoor unit 2 via liquid refrigerant connection pipe arrangement 6, and is further depressurized via hydraulic fluid side stop valve 26, subcooler 25 and outdoor expansion valve 38, afterwards, and in the inflow outdoor heat exchanger 23.Then, the cold-producing medium of the gas-liquid two-phase state of the low pressure in the inflow outdoor heat exchanger 23 flashes to the gas refrigerant of low pressure with carrying out heat exchange by the next outdoor air of outdoor fan 28 supplies, and flows in the accumulators 24 via four-way switching valve 22.Then, the low-pressure refrigerant gas that flows in the accumulator 24 is sucked by compressor 21 once more.

Operation under aforesaid common operational mode control is undertaken by control part 8 (more specifically being with

indoor control part

47,57, outside control part 37 and with

control part

37,47,57 transmission line 8a connected to one another), this control part 8 comprises the common operation of refrigerating operaton and heating operation, plays a role as common operating control device.

＜test/trial running mode 〉

With Fig. 1～Fig. 3 test/trial running mode is described below.At this, Fig. 3 is the flow chart of test/trial running mode.In this example, under test/trial running mode, at first carry out the cold-producing medium of step S1 and fill operation automatically, then carry out the pipe arrangement volume calculation process of step S2.

In this example, be that example describes with following occasion, promptly, outdoor unit 2, the indoor unit 4,5 that is pre-charged with cold-producing medium is arranged on building etc. to be provided with the place and to be communicated with pipe arrangement 6 and gas refrigerant by liquid refrigerant and be communicated with pipe arrangement 7 and be connected, thereby constitute refrigerant loop 10, afterwards, be communicated with the volume that pipe arrangement 6 and gas refrigerant are communicated with pipe arrangement 7 according to liquid refrigerant, the cold-producing medium of deficiency is appended be filled in the refrigerant loop 10.

(step S1: cold-producing medium is filled operation automatically)

At first, open the hydraulic fluid side stop valve 26 and the gas side stop valve 27 of outdoor unit 2, the cold-producing medium that is pre-filled in the outdoor unit 2 is full of in the refrigerant loop 10.

Then, is connected with the maintenance port (not shown) of refrigerant loop 10 when the operator who trys out will append the refrigerant tank of filling usefulness, also direct or when remotely sending the instruction that begins to try out by remote controller (not shown) etc., carry out the processing of step S11 shown in Figure 4～step S13 by control part 8.At this, Fig. 4 is the flow chart that cold-producing medium is filled operation automatically.

(step S11: the determining amount of refrigerant operation)

When sending cold-producing medium and fill the sign on of operation automatically, the four-way switching valve 22 of the outdoor unit 2 in refrigerant loop 10 is in the

indoor expansion valve

41,51 of state shown in the solid line among Fig. 1 and indoor unit 4,5 and outdoor expansion valve 38 under the situation of open mode, compressor 21, outdoor fan 28 and indoor fan 43,53 start, and indoor unit 4,5 is all carried out refrigerating operaton (below be called indoor unit all move) forcibly.

So, as shown in Figure 5, in refrigerant loop 10, flowing in the stream till from compressor 21 to the outdoor heat converter 23 that plays a role as condenser in compressor 21, be compressed the high-pressure gas refrigerant of discharging the back (with reference to the diagonal line hatches part of Fig. 5 from compressor 21 to outdoor heat converter the part till 23), in the outdoor heat converter 23 that plays a role as condenser, flowing and be phase-changed into liquid high-pressure refrigerant (with reference to part corresponding the diagonal line hatches part of Fig. 5 and the blacking dash area) from gaseous state with outdoor heat converter 23 because of carrying out heat exchange with outdoor air, from outdoor heat converter 23 to indoor expansion valve 41, till 51, comprise outdoor expansion valve 38, the part and the liquid refrigerant by the main refrigerant circuit side of subcooler 25 are communicated with pipe arrangement 6 at interior stream, and the liquid refrigerant of the high pressure that flowing in the stream till from outdoor heat converter 23 to bypass expansion valve 62 (with reference to the blacking dash area of Fig. 5 from outdoor heat converter 23 to indoor expansion valve 41,51 and bypass expansion valve 62 till part), the indoor heat converter 42 that is playing a role as evaporimeter, 52 part and subcooler 25 be phase-changed into the low pressure refrigerant of gaseous state (with reference to the clathrate shade of Fig. 5 and diagonal line hatches indoor heat converter 42 partly because of carrying out heat exchange from the gas-liquid two-phase state by flowing on the part of bypass refrigerant loop side with room air, the part of 52 part and subcooler 25), from indoor heat converter 42,52 till the compressor 21, comprise that gas refrigerant is communicated with the stream of pipe arrangement 7 and accumulator 24, and from subcooler 25 by in the part of the bypass refrigerant loop side stream till the compressor 21, the gas refrigerant of the low pressure that flowing (with reference in the diagonal line hatches part of Fig. 5 from indoor heat converter 42,52 till the compressor 21 part and from subcooler 25 by the part of the bypass refrigerant loop side part till the compressor 21).Fig. 5 is the schematic diagram (four-way switching valve 22 etc. are not shown) of the state of the expression determining amount of refrigerant cold-producing medium that flows in refrigerant loop 10 in service.

Then, transfer to by following equipment and control the operation that the state of the cold-producing medium that makes in refrigerant loop 10 circulation becomes stable.Particularly, to

indoor expansion valve

41,51 control so that the indoor heat converter 42 that plays a role as evaporimeter, 52 degree of superheat SHr becomes necessarily (below be called the degree of superheat control), the working capacity of compressor 21 is controlled so that evaporating pressure Pe becomes necessarily (below be called evaporating pressure control), the air quantity Wo of the outdoor air supplied with to outdoor heat converter 23 with outdoor fan 28 is controlled so that the condensing pressure Pc of the cold-producing medium outdoor heat converter 23 in becomes necessarily (below be called condensing pressure control), the ability of subcooler 25 is controlled so that be sent to indoor expansion valve 41 from subcooler 25, the temperature of 41 cold-producing medium becomes necessarily (below be called fluid pipeline temperature control), and make by indoor fan 43,53 to indoor heat converter 42, the air quantity Wr of 52 room airs of supplying with becomes necessarily, so that the evaporating pressure Pe of cold-producing medium is by above-mentioned evaporating pressure control control stably.

At this, why carry out evaporating pressure control and be because: in the indoor heat converter 42,52 that plays a role as evaporimeter, flowing because of carrying out heat exchange is phase-changed into gaseous state from the gas-liquid two-phase state low pressure refrigerant with room air, the refrigerant amount of (part with reference to corresponding with indoor heat converter 42,52 in the clathrate shade of Fig. 5 and the diagonal line hatches part is called evaporator portion C below) of flowing in the indoor heat converter 42,52 of low pressure refrigerant can produce bigger influence to the evaporating pressure Pe of cold-producing medium.At this, utilize rotating speed Rm be transformed device control motor 21a control the working capacity of compressor 21, thereby the evaporating pressure Pe of the cold-producing medium in the indoor heat converter 42,52 is become necessarily, make the state of the cold-producing medium that in evaporimeter C, flows become stable, thereby form the state that mainly refrigerant amount in the evaporimeter C is changed by evaporating pressure Pe.In the control of 21 couples of evaporating pressure Pe of compressor of this example, to convert the saturation pressure value to hydraulic fluid side temperature sensor 44, the 54 detected refrigerant temperature values (Te is corresponding with evaporating temperature) of indoor heat converter 42,52, so that this force value is stabilized in the form of low voltage target value Pes (promptly making the control of the rotating speed Rm variation of motor 21a) controlled in the operation of compressor 21, realized by the circulating mass of refrigerant Wc that flows in refrigerant loop 10 is increased and decreased.Though in this example, do not adopt, but also can control the working capacity of compressor 21, so that with indoor heat converter 42, the running status amount of the refrigerant pressure equivalence of cold-producing medium under evaporating pressure Pe in 52, the suction pressure Ps that is the detected compressor 21 of suction pressure sensor 29 is stabilized in low voltage target value Pes, or the saturation temperature value (with evaporating temperature Te corresponding) corresponding with suction pressure Ps is stabilized in low voltage target value Tes, can also control the working capacity of compressor 21, so that indoor heat converter 42,52 hydraulic fluid side temperature sensor 44,54 detected refrigerant temperatures (Te is corresponding with evaporating temperature) are stabilized in low voltage target value Tes.

By carrying out this evaporating pressure control, from indoor heat converter 42,52 till the compressor 21 comprise gas refrigerant be communicated with in the refrigerant piping of pipe arrangement 7 and accumulator 24 (with reference in the diagonal line hatches part of Fig. 5 from indoor heat converter 42,52 arrive the part till the compressor 21, be called gas refrigerant throughput D below) state of mobile cold-producing medium also becomes stable, thereby be formed in the gas refrigerant throughput D refrigerant amount mainly because of with the running status amount of the refrigerant pressure equivalence of gas refrigerant throughput D, be evaporating pressure Pe (being suction pressure Ps) and the state that changes.

Why carry out condensing pressure control and be because: be phase-changed in the outdoor heat converter 23 of high-pressure refrigerant of liquid state (the part corresponding with reference to the diagonal line hatches of Fig. 5 and blacking dash area from gaseous state because of carrying out heat exchange flowing with outdoor heat converter 23 with outdoor air, be called condenser portion A below), refrigerant amount can produce bigger influence to the condensing pressure Pc of cold-producing medium.In addition, because the condensing pressure Pc of the cold-producing medium at this condenser portion A place can change by a larger margin than the influence of outdoor temperature Ta, therefore, control by air quantity Wo the room air supplied with to outdoor heat converter 23 from outdoor fan 28 by motor 28a, the condensing pressure Pc of the cold-producing medium in the outdoor heat converter 23 is become necessarily, make in condenser portion A the state of the cold-producing medium that flows become stable, thereby form the state that the refrigerant amount in the condenser portion A mainly changes because of the degree of supercooling Sco of the hydraulic fluid side (being called the outlet of outdoor heat converter 23 in the related description of determining amount of refrigerant operation below) of outdoor heat converter 23.In the control of 28 couples of condensing pressure Pc of outdoor fan of this example, use be with outdoor heat converter 23 in cold-producing medium condensing pressure Pc equivalence running status, be the temperature (being condensation temperature Tc) of the detected cold-producing medium that in outdoor heat converter 23, flows of the discharge pressure Pd of the detected compressor 21 of discharge pressure sensor 30 or heat exchange temperature sensor 33.

By carrying out this condensing pressure control, from outdoor heat converter 23 to indoor expansion valve 41, comprise outdoor expansion valve 38 till 51, the part and the liquid refrigerant by the main refrigerant circuit side of subcooler 25 are communicated with pipe arrangement 6 at interior stream, and the liquid refrigerant of the high pressure that flowing in the stream till the bypass expansion valve 62 from outdoor heat converter 23 to bypass refrigerant loop 61, from outdoor heat converter 23 to

indoor expansion valve

41,51 and bypass expansion valve 62 till part (with reference to the blacking dash area of Fig. 5, be called liquid refrigerant path B below) on the pressure of cold-producing medium also stable, liquid refrigerant path B is sealed to form by liquid refrigerant and is stable state.

Why carry out fluid pipeline temperature control and be not changing for the density that makes the liquid refrigerant that comprises from subcooler 25 to indoor expansion valve 41; 51 be communicated with in the refrigerant piping of pipe arrangement, 6 cold-producing medium of (with reference to the part till from subcooler 25 to

indoor expansion valve

41,51 the liquid refrigerant path B shown in Figure 5). by so that be located at form that the temperature T lp of the detected cold-producing medium of the fluid pipeline temperature sensor 35 by the exit of main refrigerant circuit side of subcooler 25 is stabilized in fluid pipeline temperature objectives value Tlps to the flow at the interior mobile cold-producing medium of bypass refrigerant loop 61 increase and decrease, at the cold-producing medium of the main refrigerant circuit side flow of subcooler 25 and the capability control that the heat-shift between the cold-producing medium of bypass refrigerant loop side flow regulates to realize subcooler 25. Regulate the flow that increases and decreases the above-mentioned cold-producing medium that in bypass refrigerant loop 61, flows by the aperture of bypass expansion valve 62.Like this, just can realize fluid pipeline temperature control, the refrigerant temperature that the liquid refrigerant that comprises from subcooler 25 to

indoor expansion valve

41,51 is communicated with in the refrigerant piping of pipe arrangement 6 becomes necessarily.

By carrying out this fluid pipeline temperature control, even the refrigerant amount in refrigerant loop 10 increases gradually because of refrigerant loop 10 is filled cold-producing medium, the refrigerant temperature Tco (being the degree of supercooling Sco of the cold-producing medium in outdoor heat converter 23 exits) that causes outdoor heat converter 23 exits simultaneously is when changing, the variation of the refrigerant temperature Tco in outdoor heat converter 23 exits also just influences the refrigerant piping that is exported to subcooler 25 from outdoor heat converter 23, does not comprise among the liquid refrigerant circulation B of portion from subcooler 25 to indoor expansion valve 41 and can not influence, liquid refrigerant till 51 is communicated with pipe arrangement 6 at interior refrigerant piping.

Why carrying out degree of superheat control, is because the refrigerant amount of evaporator portion C can produce bigger influence to the aridity of the cold-producing medium in indoor heat converter 42,52 exits.Degree of superheat SHr for the cold-producing medium in these indoor heat converter 42,52 exits, by the aperture of

indoor expansion valve

41,51 is controlled, make the degree of superheat SHr of cold-producing medium of the gas side (being called the outlet of indoor heat converter 42,52 in the related description of below determining amount of refrigerant operation) of indoor heat converter 42,52 be stabilized in degree of superheat desired value SHrs (promptly, make the gas refrigerant in indoor heat converter 42,52 exits become superheat state), thus make the state of the cold-producing medium that in evaporator portion C, flows become stable.

By carrying out this degree of superheat control, can form the state that gas refrigerant is flowed reliably in gas refrigerant interconnecting part D.

By above-mentioned various controls, the cold-producing medium of circulation is in stable condition in refrigerant loop 10, the distributional stability of the refrigerant amount in refrigerant loop 10, therefore, fill when begin to refrigerant loop 10 in, to fill cold-producing medium when appending, can make the variation of the refrigerant amount in the refrigerant loop 10 mainly show as the variation (below this operation being called determining amount of refrigerant moves) of the interior refrigerant amount of outdoor heat converter 23 by the cold-producing medium that then carries out.

Above-mentioned control is carried out as the processing of step S11 by carrying out control part 8 determining amount of refrigerant operation, that play a role as the determining amount of refrigerant operating control device (more specifically be

indoor control part

47,57, outside control part 37 and with

control part

37,47,57 transmission line 8a connected to one another).

(step S12: the computing of refrigerant amount)

Then, in refrigerant loop 10, append the filling cold-producing medium while carrying out above-mentioned determining amount of refrigerant operation, at this moment, the control part 8 that utilization plays a role as the refrigerant amount arithmetic unit comes refrigerant amount in the computing refrigerant loop 10 based on the running status amount of appending when filling cold-producing medium cold-producing medium mobile refrigerant loop 10 in or constitution equipment among the step S12.

At first the refrigerant amount arithmetic unit to this example describes.The refrigerant amount arithmetic unit is divided into a plurality of parts with refrigerant loop 10 and to cutting apart the each several part computing refrigerant amount of formation, comes the refrigerant amount in the computing refrigerant loop 10 thus.More specifically, to the each several part of cutting apart formation set the refrigerant amount of each several part and the running status amount of the cold-producing medium that in refrigerant loop 10, flows or constitution equipment between relational expression, can use these relational expressions to come the refrigerant amount of computing each several part.In this example, be in the state shown in the solid line among Fig. 1 at four-way switching valve 22, be that the discharge side of compressor 21 is connected with the gas side of outdoor heat converter 23 and the suction side of compressor 21 is communicated with under pipe arrangement 7 and the state that the gas side of indoor heat converter 42,52 is connected by gas side stop valve 27 and gas refrigerant, refrigerant loop 10 is divided into: the part of compressor 21 and the part from compressor 21 to the outdoor heat converter 23 that comprises four-way switching valve 22 (representing Fig. 5) (below be called the E of high-pressure gas pipe portion); The part of outdoor heat converter 23 (being condenser portion A); Among the liquid refrigerant circulation B of portion from outdoor heat converter 23 to subcooler half one of entrance side of the part till 25 and subcooler 25 (below be called the high-temp liquid pipe B1 of portion) by the part of main refrigerant circuit side; The part till (expression Fig. 5) by half one of outlet side of the part of main refrigerant circuit side with from subcooler 25 to hydraulic fluid side stop valve 26 of subcooler 25 among the liquid refrigerant path B (below be called the cryogenic liquid pipe B2 of portion); Liquid refrigerant among the liquid refrigerant path B is communicated with the part (below be called liquid refrigerant be communicated with the pipe arrangement B3 of portion) of pipe arrangement 6; Liquid refrigerant from liquid refrigerant path B is communicated with part till the gas refrigerant of pipe arrangement 6 in the gas refrigerant throughput D of the part that comprises indoor expansion valve 41,51 and indoor heat converter 42,52 (being evaporator portion C) is communicated with pipe arrangement 7 (below be called the F of indoor unit portion); Gas refrigerant among the gas refrigerant throughput D is communicated with the part (below be called gas refrigerant be communicated with the pipe arrangement G of portion) of pipe arrangement 7; Among the gas refrigerant throughput D from the part that comprise four-way switching valve 22 and accumulator 24 of gas side stop valve 27 (Fig. 5 expression) till compressor 21 (below be called the H of low-pressure gas pipe portion); And among the liquid refrigerant path B from the part by the part of bypass refrigerant loop side that comprise bypass expansion valve 62 and subcooler 25 of the high-temp liquid pipe B1 of portion till the H of low-pressure gas pipe portion (below be called the I of bypass circulation portion), each several part has been set relational expression.The following describes the relational expression that each part mentioned above is set.

In this example, the relational expression between the running status amount of the refrigerant amount Mog1 of the E of high-pressure gas pipe portion and cold-producing medium that flows in refrigerant loop 10 or constitution equipment is for example represented by following functional expression:

Mog1＝Vog1×ρd

This functional expression is the density p d that the volume V og1 of the E of high-pressure gas pipe portion of outdoor unit 2 is multiplied by the cold-producing medium of the E of high-pressure gas pipe portion.Wherein, the volume V og1 of the E of high-pressure gas pipe portion be outdoor unit 2 is arranged at the place is set before known value, be stored in advance in the memory of control part 8.The density p d of the cold-producing medium of the E of high-pressure gas pipe portion can obtain by conversion discharge temperature Td and discharge pressure Pd.

Relational expression between the running status amount of the refrigerant amount Mc of condenser portion A and cold-producing medium that flows in refrigerant loop 10 or constitution equipment is for example represented by the following functional expression that outdoor temperature Ta, condensation temperature Tc, compressor are discharged the refrigerant density ρ co in the saturated solution density p c of the cold-producing medium in degree of superheat SHm, circulating mass of refrigerant Wc, the outdoor heat converter 23 and outdoor heat converter 23 exits:

Mc＝kc1×Ta+kc2×Tc+kc3×SHm+kc4×Wc

+kc5×ρc+kc6×ρco+kc7

Parameter kc1 in the above-mentioned relation formula～kc7 is stored in the memory of control part 8 in advance by test and detailed Simulation result are carried out obtaining after the regression analysis.It is the degree of superheat that compressor is discharged the cold-producing medium of side that compressor is discharged degree of superheat SHm, can obtain by the saturation temperature value that discharge pressure Pd is converted into the saturation temperature value of cold-producing medium and deducts this cold-producing medium from discharge temperature Td.Circulating mass of refrigerant Wc is expressed as function (that is Wc=f (Te, Tc)), of evaporating temperature Te and condensation temperature Tc.The saturated solution density p c of cold-producing medium can obtain by conversion condensation temperature Tc.The refrigerant density ρ co in outdoor heat converter 23 exits can convert by the temperature T co of condensing pressure Pc that conversion condensation temperature Tc is drawn and cold-producing medium and obtain.

Relational expression between the running status amount of the refrigerant amount Mol1 of the high-temp liquid pipe B1 of portion and cold-producing medium that flows in refrigerant loop 10 or constitution equipment is for example represented by following functional expression:

Mol1＝Vol1×ρco

This functional expression is the refrigerant density ρ co (being the density of the cold-producing medium in above-mentioned outdoor heat converter 23 exits) that the volume V ol1 of the high-temp liquid pipe B1 of portion of outdoor unit 2 is multiplied by the high-temp liquid pipe B1 of portion.The volume V ol1 of the high-temp liquid pipe B1 of portion be outdoor unit 2 is arranged at the place is set before known value, be stored in advance in the memory of control part 8.

Relational expression between the running status amount of the refrigerant amount Mol2 of the cryogenic liquid pipe B2 of portion and cold-producing medium that flows in refrigerant loop 10 or constitution equipment is for example represented by following functional expression:

Mol2＝Vol2×ρlp

This functional expression is the refrigerant density ρ lp that the volume V ol2 of the cryogenic liquid pipe B2 of portion of outdoor unit 2 is multiplied by the cryogenic liquid pipe B2 of portion.The volume V ol2 of the cryogenic liquid pipe B2 of portion be outdoor unit 2 is arranged at the place is set before known value, be stored in advance in the memory of control part 8.The refrigerant density ρ lp of the cryogenic liquid pipe B2 of portion is the refrigerant density in subcooler 25 exits, can obtain by the refrigerant temperature Tlp in conversion condensing pressure Pc and subcooler 25 exits.

Relational expression between the refrigerant amount Mlp of the liquid refrigerant connection pipe arrangement B3 of portion and the running status amount of cold-producing medium that flows in refrigerant loop 10 or constitution equipment is for example represented by following functional expression:

Mlp＝Vlp×ρlp

This functional expression is that the volume V lp that liquid refrigerant is communicated with pipe arrangement 6 is multiplied by the refrigerant density ρ lp (being the density of the cold-producing medium in subcooler 25 exits) that liquid refrigerant is communicated with the pipe arrangement B3 of portion.

Relational expression between the running status amount of the refrigerant amount Mr of the F of indoor unit portion and cold-producing medium that flows in refrigerant loop 10 or constitution equipment is for example represented by the following functional expression of the air quantity Wr of the degree of superheat SHr of the cold-producing medium in temperature T lp, the temperature difference Δ T that has deducted evaporating temperature Te from indoor temperature Tr of the cold-producing medium in subcooler 25 exits, indoor heat converter 42,52 exits and indoor fan 43,53:

Mr＝kr1×Tlp+kr2×ΔT+kr3×SHr+kr4×Wr+kr5

Parameter kr1 in the above-mentioned relation formula～kr5 is stored in the memory of control part 8 in advance by test and detailed Simulation result are carried out obtaining after the regression analysis.At this, corresponding two indoor units 4,5 have been set the relational expression of refrigerant amount Mr respectively, by with the refrigerant amount Mr of the refrigerant amount Mr of indoor unit 4 and indoor unit 5 whole refrigerant amounts of Calais's computing indoor unit F of portion mutually.At the type of indoor unit 4 and indoor unit 5 and capacity not simultaneously, the different relational expression of the value of operation parameter kr1～kr5 then.

Relational expression between the refrigerant amount Mgp of the gas refrigerant connection pipe arrangement G of portion and the running status amount of cold-producing medium that flows in refrigerant loop 10 or constitution equipment is for example represented by following functional expression:

Mgp＝Vgp×ρgp

This functional expression is that the volume V gp that gas refrigerant is communicated with pipe arrangement 7 is multiplied by the refrigerant density ρ gp that gas refrigerant is communicated with the pipe arrangement H of portion.The refrigerant density ρ gp that gas refrigerant is communicated with the pipe arrangement G of portion is the refrigerant density ρ s of compressor 21 suction sides and the mean value of the refrigerant density ρ eo that indoor heat converter 42,52 outlets (being the inlet that gas refrigerant is communicated with pipe arrangement 7) are located.Refrigerant density ρ s can obtain by conversion suction pressure Ps and inlet temperature Ts, refrigerant density ρ eo can by to the scaled value of evaporating temperature Te, be that the outlet temperature Teo of evaporating pressure Pe and indoor heat converter 42,52 converts and obtains.

Relational expression between the running status amount of the refrigerant amount Mog2 of the H of low-pressure gas pipe portion and cold-producing medium that flows in refrigerant loop 10 or constitution equipment is for example represented by following functional expression:

Mog2＝Vog2×ρs

This functional expression is the refrigerant density ρ s that the volume V og2 of the H of low-pressure gas pipe portion in the outdoor unit 2 is multiplied by the H of low-pressure gas pipe portion.The volume V og2 of the H of low-pressure gas pipe portion be arranged at the place is set before known value, be stored in advance in the memory of control part 8.

Relational expression between the running status amount of the refrigerant amount Mob of the I of bypass circulation portion and cold-producing medium that flows in refrigerant loop 10 or constitution equipment is representing by the density p s of the cold-producing medium in the exit of bypass circulation side and the following functional expression of evaporating pressure Pe by the refrigerant density ρ co in outdoor heat converter 23 exits, subcooler 25 for example:

Mob＝kob1×ρco+kob2×ρs+kob3×Pe+kob4

Parameter kob1 in the above-mentioned relation formula～kob3 is stored in the memory of control part 8 in advance by test and detailed Simulation result are carried out obtaining after the regression analysis.Because it is less that the volume Mob of the I of bypass circulation portion and other parts are compared refrigerant amount, therefore also available more simple relation is come computing.For example represent by following functional expression:

Mob＝Vob×ρe×kob5

This functional expression is saturated solution density p e and the correction factor kob that the volume V ob of the I of bypass circulation portion is multiplied by the part of leaning on the bypass circulation side of subcooler 25.The volume V ob of the I of bypass circulation portion be outdoor unit 2 is arranged at the place is set before known value, be stored in advance in the memory of control part 8.The saturated solution density p e of the part of leaning on the bypass circulation side of subcooler 25 can obtain by conversion suction pressure Ps or evaporating temperature Te.

An outdoor unit 2 is arranged in this example, but when connecting a plurality of outdoor unit, refrigerant amount Mog1, Mc, Mol1, Mol2, Mog2 and the Mob relevant with outdoor unit, the relational expression of the refrigerant amount by a plurality of outdoor units being set each several part respectively and with whole refrigerant amounts of refrigerant amount phase Calais's computing outdoor unit of the each several part of a plurality of outdoor units.

As mentioned above, in this example, dependency relation formula by using refrigerant loop 10 each several parts is also come the refrigerant amount of computing each several part based on the running status amount of determining amount of refrigerant cold-producing medium mobile refrigerant loop 10 in service or constitution equipment, can calculate the refrigerant amount of refrigerant loop 10.

Owing to carry out the whether suitable decision condition of the refrigerant amount of this step S12 in satisfying following step S13 repeatedly, therefore, cold-producing medium append filling till from beginning to finish during in, can use the dependency relation formula of refrigerant loop 10 each several parts and the operating condition amount when filling based on cold-producing medium calculates the refrigerant amount of each several part.More specifically, refrigerant amount Mo and refrigerant amount Mr in each indoor unit 4,5 (refrigerant amount of the each several part of the refrigerant loop 10 except cold-producing medium is communicated with pipe arrangement 6,7) in can be when judging among the following step S13 that refrigerant amount is the whether suitable required outdoor unit 2 carry out computing.At this, the refrigerant amount Mo in the outdoor unit 2 can obtain by refrigerant amount Mog1, Mc, Mol1, Mol2, Mog2 and the Mob addition with the each several part in the above-mentioned outdoor unit 2.

Like this, carry out the processing of step S12 by the control part 8 that plays a role as the refrigerant amount arithmetic unit, this control part 8 comes the refrigerant amount of computing refrigerant loop 10 each several parts based on the automatic running status amount of filling cold-producing medium that flows in service or constitution equipment in refrigerant loop 10 of cold-producing medium.

(step S13: the judgement whether refrigerant amount is suitable)

As mentioned above, when the filling cold-producing medium was appended in beginning in refrigerant loop 10, the refrigerant amounts in the refrigerant loop 10 increased gradually.At this, when cold-producing medium is communicated with the volume of pipe arrangement 6,7 when unknown, can't with cold-producing medium append refrigerant amount that the refrigerant amount that will be filled into after the filling in the refrigerant loop 10 is defined as refrigerant loop 10 integral body, be integral-filled refrigerant amount Mt.But, if only be conceived to outdoor unit 2 and indoor unit 4,5 (promptly are communicated with pipe arrangement 6 except cold-producing medium, refrigerant loop 10 beyond 7), then can predict the refrigerant amount Mo and the indoor unit 4 of best outdoor unit 2 by test and detailed simulation, 5 refrigerant amount Mr, therefore, carry out the filling of appending of cold-producing medium after needing only in the memory that in advance this refrigerant amount is stored in control part 8 as target loading Ms, up to refrigerant amount Mo and indoor unit 4 with outdoor unit 2, refrigerant amount after 5 the refrigerant amount Mr addition (be refrigerant loop 10 be communicated with pipe arrangement 6 except cold-producing medium, the refrigerant amount of the part beyond 7) till reaching this target loading Ms, value (below be called unit inner refrigerant amount Mu) gets final product the refrigerant amount Mo of outdoor unit 2 and indoor unit 4,5 refrigerant amount Mr can be by using the above-mentioned relation formula and carry out computing based on the automatic filling of the cold-producing medium cold-producing medium that flows in service or the running status amount of constitution equipment in refrigerant loop 10.That is, whether step S13 reaches target loading Ms and judges by cold-producing medium automatically being filled unit inner refrigerant amount Mu in service, judges thus whether fill the refrigerant amount that is filled in the refrigerant loop 10 by appending of cold-producing medium suitable.

In step S13, when unit inner refrigerant amount Mu less than target loading Ms, cold-producing medium append filling imperfect tense, carry out the processing of step S13 repeatedly, up to reaching target loading Ms.When unit inner refrigerant amount Mu has reached target loading Ms, make display part 9b show the completed information of filling of appending of cold-producing medium, stop from refrigerant tank the supply system cryogen, the step S1 that fills the operation processing as cold-producing medium automatically finishes.

Like this, utilization is filled the control part 8 that decision maker plays a role automatically as the cold-producing medium of one of determining amount of refrigerant device and is carried out the processing of step S13, and the refrigerant amounts in the determining amount of refrigerant that 8 pairs of cold-producing mediums of this control part the are filled operation automatically refrigerant loop 10 in service whether judge by suitable (promptly whether reaching target loading Ms).Automatically fill operation by this cold-producing medium, before cold-producing medium is filled operation automatically, be filled into refrigerant amount (promptly being filled into the amount of the cold-producing medium in the outdoor unit 3 in advance) in the refrigerant loop 10, be added on the pre-filled volume Mi refrigerant amount that appends filling, promptly append refrigerant amount behind the loading Ma, be that integral-filled refrigerant amount Mt just is filled in the refrigerant loop 10.

(step S2: the computing of pipe arrangement volume)

Automatically fill after operation finishes at the cold-producing medium of above-mentioned steps S1, transfer to the pipe arrangement volume calculation process of step S2.In pipe arrangement volume calculation process, carry out the processing of step S21 shown in Figure 6～step S25 by the control part 8 that plays a role as pipe arrangement volume arithmetic unit, this control part 8 comes the computing cold-producing medium to be communicated with the volume of

pipe arrangement

6,7 based on appending loading Ma.At this, Fig. 6 is the flow chart of pipe arrangement volume calculation process.

(step S21, S22: the data when the storage cold-producing medium is filled operation automatically, loading is appended in input)

In step S21, the service data when above-mentioned cold-producing medium is filled operation automatically stores in the memory of control part 8, can in following step S23 the density of cold-producing medium mobile in cold-producing medium is communicated with

pipe arrangement

6,7 being carried out computing.At this, as the data in the memory that is stored in control part 8, comprise that required suction pressure Ps, inlet temperature Ts, evaporating pressure Pe, outlet temperature Teo, the cold-producing medium of computing that liquid refrigerant is communicated with the density p gp of the temperature T lp of the cold-producing medium in required condensing pressure Pc of the computing of density p lp of cold-producing medium of the pipe arrangement B3 of portion and subcooler 25 exits, cold-producing medium that gas refrigerant is communicated with the pipe arrangement H of portion fill the unit inner refrigerant amount Mu of operation when finishing automatically.

In step S22, will append loading Ma or comprise that the value of the integral-filled refrigerant amount Mt that appends loading Ma is input in the memory of control part 8 by input part 9a.At this, append loading Ma and be the value of filling the refrigerant amount that the weight change etc. of refrigerant tank in service obtains according to cold-producing medium automatically, both can manually be input in the memory of control part 8 by the input part 9a that is arranged on the control part 8 by the operator who appends filling, the scale of weight change that also can be by will being used to measure refrigerant tank is connected with control part 8 as input part 9a and automatically is input in the memory of control part 8.

The processing of these steps S21, S22 is to carry out in the processing of pipe arrangement volume computing at this, but also can carry out in above-mentioned cold-producing medium is filled the processing of operation automatically.

(step S23, S24: be communicated with the computing of pipe arrangement refrigerant amount, the computing of density, the computing of pipe arrangement volume)

In step S23, at first, before cold-producing medium is filled operation automatically, be filled into refrigerant amount in the refrigerant loop 10, be add on the initial refrigerant amount Mi in step S22, be transfused to control part 8 append loading Ma, to fill the refrigerant amount of operation back refrigerant loop 10 integral body automatically be integral-filled refrigerant amount Mt thereby obtain cold-producing medium.At this, initial refrigerant amount Mi has been stored in control part 8.Then, from this integral-filled refrigerant amount Mt, deduct the unit inner refrigerant amount Mu (or target loading Ms) that in step S21, is stored in the control part 8, be communicated with refrigerant amount in the

pipe arrangement

6,7, promptly be communicated with pipe arrangement refrigerant amount Mp thereby obtain cold-producing medium.

In step S23, when obtaining cold-producing medium and fill operation automatically based on the temperature T lp of the cold-producing medium that in step S21, is stored in condensing pressure Pc in the control part 8 and subcooler 25 exits in liquid refrigerant is communicated with the pipe arrangement B3 of portion (liquid refrigerant is communicated with pipe arrangement 6) flowing liquid refrigerant density ρ lp, and based on the suction pressure Ps that in step S21, is stored in the control part 8, inlet temperature Ts, evaporating pressure Pe, outlet temperature Teo obtains cold-producing medium and fill gas refrigerant density p gp (because these density p lp that flows when moving automatically in gas refrigerant is communicated with the pipe arrangement H of portion (gas refrigerant is communicated with pipe arrangement 7), the computing of ρ gp and above-mentioned cold-producing medium are filled the density p lp in the refrigerant amount computing among the step S12 of operation automatically, ρ gp is identical, therefore omits its explanation at this).

In step S24, come the computing cold-producing medium to be communicated with the volume (particularly being that liquid refrigerant is communicated with the volume V lp of pipe arrangement 6 and the volume V gp that gas refrigerant is communicated with pipe arrangement) of

pipe arrangement

6,7 based on the connection pipe arrangement refrigerant amount Mp that in step S23, obtains and density p lp, ρ gp.

At this, at first the operation method that the cold-producing medium of this example is communicated with the volume of

pipe arrangement

6,7 describes.

Because being communicated with pipe arrangement 6, liquid refrigerant is arranged to indoor unit 4,5 is connected with outdoor unit 2 with gas refrigerant connection pipe arrangement 7, therefore piping length is roughly the same, because the density difference of mobile cold-producing medium in pipe, so the pipe arrangement diameter, be the flow path cross sectional area difference.Therefore, it is roughly corresponding with the ratio of both flow path cross sectional areas that liquid refrigerant is communicated with the volumetric ratio that pipe arrangement 6 and gas refrigerant be communicated with 7 of pipe arrangements (the volume V gp that in the following description gas refrigerant is communicated with pipe arrangement 7 divided by the value Vgp/Vlp of the volume V lp of liquid refrigerant connection pipe arrangement 6 as volumetric ratio Rv), and, the ratio of flow path cross sectional area depends on ability, the form of indoor unit 4,5 and outdoor unit 2, therefore, this volumetric ratio Rv is the value in certain scope.

If liquid refrigerant connection pipe arrangement 6 is communicated with the volumetric ratio Rv of 7 of pipe arrangements with gas refrigerant known, then shown in following functional expression, the volume V lp that liquid refrigerant is communicated with pipe arrangement 6 is multiplied by value and value sum after the volume V gp of gas refrigerant connection pipe arrangement 7 is multiplied by gas refrigerant density p gp behind the liquid refrigerant density ρ lp with to be communicated with pipe arrangement refrigerant amount Mp identical.

Vlp×ρlp+Vgp×ρgp＝Vlp×ρlp+(Vlp×Rv)×ρgp

＝Vlp×(ρlp+Rv×ρgp)

＝Mp

Thus, the volume V lp of liquid refrigerant connection pipe arrangement can utilize following functional expression to come computing:

Vlp＝Mp/(ρlp+Rv×ρgp)

The volume V gp that gas refrigerant is communicated with pipe arrangement 7 can utilize following functional expression to come computing:

Vgp＝Vlp×Rv

In this example, liquid refrigerant is communicated with pipe arrangement 6 is communicated with 7 of pipe arrangements with gas refrigerant volumetric ratio Rv to be stored in the memory of control part 8 in advance as the corresponding value of ability, form with indoor unit 4,5 and outdoor unit 2, based on the connection pipe arrangement refrigerant amount Mp that in step S23, obtains and density p lp, ρ gp and volumetric ratio Rv, use above-mentioned arithmetic expression to come the computing cold-producing medium to be communicated with the volume (particularly being that liquid refrigerant is communicated with the volume V lp of pipe arrangement 6 and the volume V gp that gas refrigerant is communicated with pipe arrangement) of

pipe arrangement

6,7.

＜cold-producing medium leak detection operational mode 〉

With Fig. 1, Fig. 2, Fig. 5 and Fig. 7 cold-producing medium leak detection operational mode is described below.At this, Fig. 7 is the flow chart of cold-producing medium leak detection operational mode.

In this example, whether unexpectedly leaking into outside situation from refrigerant loop 10 with regular (for example needn't carry out the time period of air conditioning etc. in the day off and the late into the night etc.) detection cold-producing medium is that example describes.

(step S31: the determining amount of refrigerant operation)

At first, after having moved certain hour (for example every half a year～one year etc.) under the such common operational mode of above-mentioned refrigerating operaton and heating operation, switch to cold-producing medium leak detection operational mode from common operational mode automatically or manually, comprise the samely that with the determining amount of refrigerant operation that initial coolant amount detection is moved indoor unit all moves, condensing pressure is controlled, the fluid pipeline temperature is controlled, the degree of superheat is controlled and evaporating pressure is controlled at interior determining amount of refrigerant operation.At this, the degree of superheat desired value SHrs in the fluid pipeline temperature objectives value Tlps in the fluid pipeline temperature control, the degree of superheat control and low voltage target value Pes in the evaporating pressure control use in principle with cold-producing medium and fill the identical value of desired value among the step S11 of determining amount of refrigerant operation in service automatically.

This determining amount of refrigerant operates in when carrying out the operation of cold-producing medium leak detection at every turn and carries out, even for example, also can keep certain with same liquid pipe temperature desired value Tlps by the temperature T lp that the control of fluid pipeline temperature make liquid refrigerant be communicated with the cold-producing medium in the pipe arrangement 6 different because of condensing pressure Pc or when cold-producing medium taking place leaking the refrigerant temperature Tco change that such service condition difference causes outdoor heat converter 23 exits.

Like this, carry out the processing of step S31 by the control part 8 that plays a role as the determining amount of refrigerant operating control device, this control part 8 comprises that indoor unit all moves, condensing pressure is controlled, the fluid pipeline temperature is controlled, the degree of superheat is controlled and evaporating pressure is controlled at interior determining amount of refrigerant operation.

(step S32: the computing of refrigerant amount)

Then, utilize on one side and carry out control part 8 that above-mentioned determining amount of refrigerant operation plays a role as the refrigerant amount arithmetic unit and come refrigerant amount in the computing refrigerant loop 10 based on the running status amount of the initial determining amount of refrigerant of step S32 cold-producing medium mobile in refrigerant loop 10 in service or constitution equipment.The computing of the refrigerant amount in the refrigerant loop 10 use the refrigerant amount of above-mentioned refrigerant loop 10 each several parts with the running status amount of cold-producing medium mobile in refrigerant loop 10 or constitution equipment between relational expression carry out computing, at this moment, because the unknown cold-producing medium in back that is provided with at the constitution equipment of aircondition 1 is communicated with pipe arrangement 6,7 volume V lp, Vgp carries out computing by above-mentioned pipe arrangement volume calculation process to be become known, therefore by these cold-producing mediums are communicated with pipe arrangement 6,7 volume V lp, Vgp is multiplied by refrigerant density and comes the computing cold-producing medium to be communicated with pipe arrangement 6, refrigerant amount Mlp in 7, Mgp, and add the refrigerant amount (the step S12 of operation is filled in the computing of the refrigerant amount of other each several part automatically with reference to cold-producing medium) of other each several part, can calculate the refrigerant amount (below be called integral operation refrigerant amount M) of refrigerant loop 10 integral body.

At this, as mentioned above, because the temperature T lp that makes liquid refrigerant be communicated with the cold-producing medium in the pipe arrangement 6 by the control of fluid pipeline temperature keeps certain under fluid pipeline temperature objectives value Tlps, therefore, no matter whether the service condition of cold-producing medium leak detection operation is different, even when the refrigerant temperature Tco in heat exchanger 23 exits change, the refrigerant amount Mlp that liquid refrigerant is communicated with the pipe arrangement B3 of portion also can keep certain.

Like this, carry out the processing of step S32 by the control part 8 that plays a role as the refrigerant amount arithmetic unit, this control part 8 comes the refrigerant amount of computing refrigerant loop 10 each several parts based on the running status amount of cold-producing medium leak detection cold-producing medium that flows in service or constitution equipment in refrigerant loop 10.

(step S33, S34: whether suitable judgement, alarm shows refrigerant amount)

In a single day cold-producing medium leaks into the outside from refrigerant loop 10, the refrigerant amounts in the refrigerant loop 10 just can reduce.If the refrigerant amount in the refrigerant loop 10 reduces, then mainly can present the tendency that the degree of supercooling SCo in outdoor heat converter 23 exits diminishes, occur correspondingly that refrigerant amount Mc in the outdoor heat converter 23 reduce, the refrigerant amount of other parts roughly keeps certain tendency.Therefore, the integral operation refrigerant amount M that calculates among the above-mentioned steps S32 is the refrigerant amount that cold-producing medium is filled refrigerant loop 10 integral body after operation has just been finished automatically when the cold-producing medium leakage takes place refrigerant loop 10, liken to judging that cold-producing medium has or not the integral-filled refrigerant amount Mt of the benchmark refrigerant amount when leaking little, do not have cold-producing medium when refrigerant loop 10 leaks and integral-filled refrigerant amount Mt roughly the same.

In step S33, have or not leakage to judge according to foregoing to cold-producing medium.In step S33,, finish cold-producing medium leak detection operational mode when being judged to be refrigerant loop 10 when cold-producing medium not taking place leaking.

On the other hand, in step S33, when being judged to be refrigerant loop 10 generation cold-producing mediums leakages, transfer to the processing of step S34, in display part 9b, show to report to detect the alarm that cold-producing medium leaks, finish cold-producing medium leak detection operational mode afterwards.

Like this, the control part 8 that is played a role by the refrigerant leakage detecting device as one of determining amount of refrigerant device carries out the processing of step S32～S34, this control part 8 is judged whether the refrigerant amount refrigerant loop 10 in is suitable while carrying out determining amount of refrigerant operation under cold-producing medium leak detection operational mode, thereby detection has or not the cold-producing medium leakage.

As mentioned above, in the aircondition 1 of this example, control part 8 plays a role as determining amount of refrigerant running gear, refrigerant amount arithmetic unit, determining amount of refrigerant device and pipe arrangement volume arithmetic unit, thereby is configured for being filled into the refrigerant amount suitable coolant amount judgment system of judging whether in the refrigerant loop 10.

(3) feature of aircondition

The aircondition 1 of this example has following feature.

(A) in the aircondition 1 of this example, based on appending loading Ma, promptly being communicated with

pipe arrangement

6,7 and connecting outdoor units 2 and indoor unit 4,5 and constituted the refrigerant amount that is added filling behind the refrigerant loop 10 by cold-producing medium, come the computing cold-producing medium to be communicated with the volume of

pipe arrangement

6,7, therefore, even be communicated with the volume of

pipe arrangement

6,7 when unknown, also can come the computing cold-producing medium to be communicated with the volume of

pipe arrangement

6,7 by the value that loading Ma is appended in input at cold-producing medium.Thus, can in the trouble that as far as possible reduces input cold-producing medium

connection pipe arrangement

6,7 information, obtain the volume that cold-producing medium is communicated with

pipe arrangement

6,7, consequently, can judge accurately whether the refrigerant amount in the refrigerant loop 10 is suitable, particularly, can judge accurately and have or not cold-producing medium to leak from refrigerant loop 10.

(B) in the aircondition 1 of this example, owing to can carry out judging that based on the running status amount of cold-producing medium mobile refrigerant loop 10 in or constitution equipment the cold-producing medium that whether reaches target loading Ms fills operation automatically, therefore can carry out the filling of appending of cold-producing medium reliably, and can fill the required value of appending loading Ma of volume that operation obtains computing cold-producing medium

connection pipe arrangement

6,7 automatically by carrying out cold-producing medium.

(C) in the aircondition 1 of this example, by from before cold-producing medium is filled operation automatically, being filled into the refrigerant amount in the refrigerant loop 10, be to add on the pre-filled volume Mi to deduct the unit inner refrigerant amount Mu that calculates according to the automatic running status amount of filling cold-producing medium that in refrigerant loop 10, flows in service or constitution equipment of cold-producing medium among the integral-filled refrigerant amount Mt that appends loading Ma and obtain, connection pipe arrangement refrigerant amount Mp when the computing cold-producing medium is filled operation automatically accurately, therefore, the computing cold-producing medium is communicated with pipe arrangement 6 accurately, 7 volume.In the aircondition 1 of this example, by liquid refrigerant being communicated with pipe arrangement 6 is communicated with 7 of pipe arrangements with gas refrigerant volumetric ratio Rv, can calculate liquid refrigerant respectively simply and be communicated with the volume V lp of pipe arrangement 6 and the volume V gp that gas refrigerant is communicated with pipe arrangement 7 as setting in advance with the corresponding value of ability, form of indoor unit 4,5 and outdoor unit 2.

(4) variation

In above-mentioned example, be by unit inner refrigerant amount Mu being carried out computing according to the automatic filling of the cold-producing medium cold-producing medium that in refrigerant loop 10, flows in service or the running status amount of constitution equipment, from integral-filled refrigerant amount Mt, deduct the unit inner refrigerant amount Mu that computing obtains, obtain the computing cold-producing medium and be communicated with pipe arrangement 6, the connection pipe arrangement refrigerant amount Mp that 7 volume is required fills the (indoor units 4 of delivering the place being set in the refrigerant loop 10 before operation is carried out automatically but the cold-producing medium that also refrigerant amount in the refrigerant loop 10 can be filled automatically the approximate quantity of the unit inner refrigerant amount Mu of operation when having reached target loading Ms by cold-producing medium is pre-charged with cold-producing medium as pre-filled volume Mi, 5 and outdoor unit 2 in).

In this case, can produce certain error because of ability, form or the platform number etc. of outdoor unit 4,5, but in servicely be added the refrigerant amount that is filled in the refrigerant loop 10, promptly append loading Ma and regard as and be present in that cold-producing medium is communicated with the interior refrigerant amount of

pipe arrangement

6,7, promptly to be communicated with pipe arrangement refrigerant amount Mp suitable owing to cold-producing medium automatically can be filled, therefore, different with above-mentioned example, need not to use unit inner refrigerant amount Mu and integral-filled refrigerant amount Mt to come computing to be communicated with pipe arrangement refrigerant amount Mp, the computing cold-producing medium is communicated with the volume of

pipe arrangement

6,7 simply.

On the contrary, in above-mentioned example, as mentioned above, owing to come arithmetic element inner refrigerant amount Mu according to the automatic filling of the cold-producing medium cold-producing medium that in refrigerant loop 10, flows in service or the running status amount of constitution equipment, therefore, even the cold-producing medium that will fill the different amount of the corresponding amount of the unit inner refrigerant amount Mu of operation when having reached target loading Ms automatically by cold-producing medium with refrigerant amount in the refrigerant loop 10 is filled into cold-producing medium as pre-filled volume Mi and fills (the indoor units 4 of delivering the place being set in the refrigerant loop 10 before operation is carried out automatically, 5 and outdoor unit 2 in), also can be communicated with pipe arrangement refrigerant amount Mp accurately under the condition of various pre-filled volume Mi, the computing cold-producing medium is communicated with pipe arrangement 6 accurately, 7 volume.

(5) other example

With reference to accompanying drawing example of the present invention is illustrated above, but concrete structure is not limited to above-mentioned example, can in the scope that does not break away from inventive concept, changes.

For example, but in above-mentioned example, the example that applies the present invention to the aircondition that changes in temperature switch is illustrated, but is not limited thereto, also can apply the present invention to special-purpose other airconditions such as aircondition that freeze.In addition, the example to the aircondition that applies the present invention to have an outdoor unit in above-mentioned example is illustrated, but is not limited thereto, and also can apply the present invention to have the aircondition of a plurality of outdoor units.

Industrial utilizability

Adopt the present invention, can reduce before the Split for conditioner operation agent of input refrigeration and be communicated with and join pipe The trouble of information, and can judge accurately whether the refrigerant amount in the refrigerant loop is suitable.

Claims

1. an aircondition (1) is characterized in that, comprising:

Refrigerant loop (10), this refrigerant loop (10) by heat source unit (2) with utilize unit (4,5) to be communicated with pipe arrangement (6,7) to be connected and to constitute by cold-producing medium; And

Pipe arrangement volume arithmetic unit, this pipe arrangement volume arithmetic unit comes the described cold-producing medium of computing to be communicated with the volume of pipe arrangement based on appending loading, and the described loading that appends is meant and is communicated with by described cold-producing medium that pipe arrangement connects described heat source unit and the described unit that utilizes has constituted the refrigerant amount that is added filling behind the described refrigerant loop.

2. aircondition as claimed in claim 1 (1), it is characterized in that, also comprise the determining amount of refrigerant device, this determining amount of refrigerant device is filled the cold-producing medium that flows in service or the running status amount of constitution equipment automatically based on cold-producing medium being appended the cold-producing medium that is filled in the described refrigerant loop (10) in described refrigerant loop, judge whether the refrigerant amount that is filled in the described refrigerant loop has reached the target loading

The described loading that appends is to fill the refrigerant amount that is filled in the described refrigerant loop that is added in service automatically at described cold-producing medium.

3. an aircondition (1) is characterized in that, comprising:

Pipe arrangement volume arithmetic unit, this pipe arrangement volume arithmetic unit comes the described cold-producing medium of computing to be communicated with the volume of pipe arrangement based on being communicated with the pipe arrangement refrigerant amount, and described connection pipe arrangement refrigerant amount is meant from appending the refrigerant amount of having filled the described refrigerant loop integral body behind the cold-producing medium, be the refrigerant amount that deducts the part except described cold-producing medium is communicated with pipe arrangement of described refrigerant loop the integral-filled refrigerant amount, be unit inner refrigerant amount and refrigerant amount in the described cold-producing medium connection pipe arrangement that obtains.

4. aircondition as claimed in claim 2 (1), it is characterized in that, also comprise the refrigerant amount arithmetic unit, this refrigerant amount arithmetic unit is filled the cold-producing medium that flows in service or the running status amount of constitution equipment automatically according to described cold-producing medium in described refrigerant loop (10), come the part except that described cold-producing medium is communicated with pipe arrangement (6,7) of the described refrigerant loop of computing refrigerant amount, be unit inner refrigerant amount

Described pipe arrangement volume arithmetic unit is by being filled into the refrigerant amount in the described refrigerant loop before described cold-producing medium is filled operation automatically, be to add the above on the initial refrigerant amount to append loading and obtain the refrigerant amount that described cold-producing medium is filled the described refrigerant loop integral body after operation has just been finished automatically, it is integral-filled refrigerant amount, obtain described cold-producing medium and be communicated with refrigerant amount in the pipe arrangement by from described integral-filled refrigerant amount, deducting described unit inner refrigerant amount, promptly be communicated with the pipe arrangement refrigerant amount, the density of coming the cold-producing medium that computing flows according to the running status amount of cold-producing medium that in described refrigerant loop, flows or constitution equipment in described cold-producing medium is communicated with pipe arrangement, and come the described cold-producing medium of computing to be communicated with the volume of pipe arrangement based on described connection pipe arrangement refrigerant amount and described density.

5. aircondition as claimed in claim 4 (1) is characterized in that,

Described cold-producing medium is communicated with pipe arrangement and comprises that liquid refrigerant is communicated with pipe arrangement (6) and gas refrigerant is communicated with pipe arrangement (7),

Described pipe arrangement volume arithmetic unit is to the density of flowing liquid cold-producing medium in described liquid refrigerant is communicated with pipe arrangement, be the density of liquid refrigerant density and the gas refrigerant that in described gas refrigerant is communicated with pipe arrangement, flows, be that gas refrigerant density is carried out computing, based on described connection pipe arrangement refrigerant amount, described liquid refrigerant connection pipe arrangement is communicated with the volumetric ratio between pipe arrangement with described gas refrigerant, described liquid refrigerant density and described gas refrigerant density come the described liquid refrigerant of computing to be communicated with the volume of pipe arrangement and described gas refrigerant connection pipe arrangement.

6. as claim 4 or 5 described airconditions (1), it is characterized in that,

Described cold-producing medium arithmetic unit is communicated with the volume of pipe arrangement (6,7) based on the described cold-producing medium that is calculated by described pipe arrangement volume arithmetic unit and to having or not cold-producing medium to leak the cold-producing medium leak detection of the judging cold-producing medium that flows in service or the running status amount of constitution equipment from described refrigerant loop (10) in described refrigerant loop, come the described refrigerant loop integral body of computing refrigerant amount, be the integral operation refrigerant amount

Described determining amount of refrigerant device is judged to have or not cold-producing medium to leak from described refrigerant loop by having or not cold-producing medium to compare from the benchmark refrigerant amount of the benchmark of described refrigerant loop leakage to described integral operation refrigerant amount with as judgement.

7. aircondition as claimed in claim 2 (1), it is characterized in that, described pipe arrangement volume arithmetic unit comes the cold-producing medium that computing flows based on the running status amount of cold-producing medium that flows or constitution equipment in described cold-producing medium is communicated with pipe arrangement in described refrigerant loop density, and append loading and described density comes the described cold-producing medium of computing to be communicated with the volume of pipe arrangement based on described.

8. aircondition as claimed in claim 7 (1) is characterized in that,

Described pipe arrangement volume arithmetic unit to the density of flowing liquid cold-producing medium in described liquid refrigerant is communicated with pipe arrangement, be liquid refrigerant density and the gas refrigerant that in described gas refrigerant is communicated with pipe arrangement, flows density, be that gas refrigerant density is carried out computing, be communicated with pipe arrangement and be communicated with the volumetric ratio between pipe arrangement, described liquid refrigerant density and described gas refrigerant density with described gas refrigerant based on the described loading, described liquid refrigerant of appending, come the volume of described liquid refrigerant connection pipe arrangement of computing and described gas refrigerant connection pipe arrangement.

9. as claim 7 or 8 described airconditions (1), it is characterized in that, also comprise the refrigerant amount arithmetic unit, this cold-producing medium arithmetic unit is communicated with pipe arrangement (6 based on the described cold-producing medium that is calculated by described pipe arrangement volume arithmetic unit, 7) volume and to having or not cold-producing medium to leak the cold-producing medium leak detection the judge cold-producing medium that in described refrigerant loop, flows in service or the running status amount of constitution equipment from described refrigerant loop (10), come the refrigerant amount of the described refrigerant loop integral body of computing, it is the integral operation refrigerant amount