CN102878737A - Method for implementing normal heating of indoor units of modular multi-unit device during defrosting - Google Patents
Method for implementing normal heating of indoor units of modular multi-unit device during defrosting Download PDFInfo
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- CN102878737A CN102878737A CN201210380811XA CN201210380811A CN102878737A CN 102878737 A CN102878737 A CN 102878737A CN 201210380811X A CN201210380811X A CN 201210380811XA CN 201210380811 A CN201210380811 A CN 201210380811A CN 102878737 A CN102878737 A CN 102878737A
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Abstract
A method for implementing normal heating of indoor units of a modular multi-unit device during defrosting is characterized by comprising steps that when all modules in a multi-module system run in heating modes and one of the modules meets the defrosting condition, power supplied for a four-way valve in the module is interrupted, the module is in a defrosting mode, in other word, the original heating mode of the module is changed into a refrigerating mode, and the other modules keep in the heating modes; and when only one module in the multi-module system runs in the heating mode and other modules are in shutdown modes, power supplied for a four-way valve of the running module is interrupted after the running module meets the defrosting condition, the running module is in a defrosting mode, in other word, the original heating mode of the running module is changed into a refrigerating mode, compressors of the other modules in the shutdown modes are started, and the other modules run in the heating modes. When outdoor units need defrosting, heat required by the outdoor units is supplied by an outdoor unit system without being supplied by the indoor units to achieve the purpose of defrosting, so that the room temperature is furthest guaranteed against fluctuating due to influence of defrosting on an indoor air conditioning system, and comfort of users when the air conditioning system is used for heating is improved.
Description
Technical field
The present invention relates to a kind of air-conditioning technical, the Defrost method of especially a kind of multi-joint unit when heating state, specifically a kind of realize during the Modular multi-connected machine defrosting in the method that normally heats of machine.
Background technology
At present, the multi-connected machine system is applied to large-scale office and commercial facility more and more, and various Deluxe villas, indoor usable floor area is larger, outer machine generally all will adopt the structure of modular parallel, and namely by the indoor circulatory systems that form an independent sealing of many off-premises stations and many, major part all such system can be freezed or heating operation according to client's demand, the such system of multi-connected machine is equivalent to strengthen outdoor heat exchanger when sub-load, can give play to superior performance
But when heating operation, outdoor heat exchanger can't be avoided the meeting frosting, the heat exchange efficiency of unit will decrease after frost knot had arrived to a certain degree, the efficient that heats also can significantly reduce, thereby affect indoor heating effect, thus the control that this time, system will enter a kind of defrosting mode, after the Ex-all of outdoor heat exchanger frost, carry out again heating mode, to guarantee that unit can carry out heating operation under higher efficient
In the prior art, traditional Modular multi-connected machine defrosting mode generally is to adopt cross valve is switched, outdoor heat exchanger in the system has been switched to condenser by evaporimeter, and indoor heat exchanger has switched to evaporimeter by condenser, and the refrigerant that compressor is discharged is through the outside heat release condensation of outdoor heat exchanger, liberated heat has heated the outdoor heat exchanger surface, removed the frost layer on it, i.e. defrosting, then refrigerant is through after the throttling, at the indoor heat exchanger evaporation endothermic, according to this circulation.Part multi-connected machine system this kind patterns that adopt when heating operation defrost more at present, although be the technology of comparative maturity, many problems are arranged still also
Multi-connected machine system under this operation Defrost operation pattern has following several aspects impact:
(1), during Defrost operation, for off-premises station, to have changed into refrigeration mode by heating mode in fact, remove the frost of its heat exchanger surface, just must be through outdoor heat exchanger condensation heat release, its liberated heat, used heat namely defrosts, being the electric energy of input on the one hand, is exactly the heat that absorbs through indoor heat exchanger from indoor, during this period namely on the other hand, for indoor with side, indoor set has stopped heating operation, also has the refrigeration phenomenon in the part, causes indoor local temperature to reduce, the process of general defrosting all can continue about (4-10) minute, during this, indoor all is the state that keeps so all the time, and the temperature of this whole indoor of process all can slowly reduce.
(2), during Defrost operation, indoor set stops to heat, because indoor heat exchanger is evaporimeter in fact, it not only can not heat, also will be from the indoor environment absorbing heat, generation be the refrigeration phenomenon, if what continue out that interior machine fan will cause blowing out this moment is cold wind rather than hot blast, so for the situation that prevents from obviously blowing a cold wind over occurs, the control of indoor set generally is that fan is out of service.After indoor machine fan is out of service, this moment, the heat exchange of indoor heat exchanger just changed free convection into by forced convertion, heat exchange efficiency obviously descends, refrigerant major part in the indoor heat exchanger does not all evaporate, and can get back to off-premises station with a kind of form of liquid state, be that liquid is returning in system, although general multi-connected machine off-premises station all can dispose gas-liquid separator in the suction side of compressor, but this also can't be avoided system to have a certain amount of liquid refrigerants and get back to compressor by air intake duct, air-breathing time liquid all can produce certain impact to compressor, when heating at present generally speaking, about one hour of system will be except frost once, uses this system will be larger for the impact in compressor life-span for heating long area of cycle.
(3), after such defrost process finishes, system recovers heating mode again, general multi-connected machine system boot may also need 3-5 minute to heating normal operation, be that general situation is possible in this (7-15) minute, the indoor without any heating effect, if heat insulation effect is not well to build, the fluctuation of its indoor temperature may be larger, can bring a kind of uncomfortable experience to the user.
Summary of the invention
The objective of the invention is for can be because part of generating units defrosting be directed at the excessive problem of fluctuations in indoor temperature in the existing multi-joint unit heating process, invent a kind of method that realizes that interior machine normally heats during the defrosting of Modular multi-connected machine.
Technical scheme of the present invention is:
A kind of realize during the Modular multi-connected machine defrosting in the method that normally heats of machine, it is characterized in that it may further comprise the steps:
1) whether at first, judging in the outer machine module of multi-connected machine has outer machine module to enter defrost state, and makes in addition that the machine module normally defrosts, and other module heating operations, interior machine normally carry out heating operation;
2) when the outer machine module of defrosting enters defrosting mode,, other modules keep the heating mode operation if being in heating mode, be in holding state if satisfy the defrosting conditioned disjunction, it is the cross valve switching that powered on, but because interior function power demand very little, compressor does not start, and then should force the outer machine module that is in standby or satisfied defrosting condition to enter heating mode, the compressor start operation;
3) make the outer machine module that is in heating mode carry a part of heat to the outer machine module that is defrosting, to improve defrosting speed, another part then is delivered to indoor set, to guarantee the normal heating operation of interior machine.
The operation control step of described step 1) is: close the cross valve that needs the defrosting module, make the exhaust of this unit enter the frost that heat exchanger surface is removed in outdoor parallel operation heat release, after refrigerant flows through heat exchanger, directly flow to other modules that heating through ball valve, through after the throttling, again from the heat of the outdoor heat exchanger suction chamber external environment of the module that heating.
Described step 2) operation control step is: the outer machine module of standby enters heating mode after receiving the signal that outer machine module begins to defrost, according to interior function power demand, determine the unlatching capacity of compressor.
During the outer machine module defrosting of described step 3), the refrigerant part that the compressor of the outer machine module that operation heats is discharged heats through ball valve to indoor set, a part is through the ball valve of the outer machine module of Defrost operation, the gas that enters the Defrost operation unit through cross valve divides, for the outer machine module that defrosts provides heat, accelerate defrosting speed.
The quantity of outer machine module is greater than the quantity of interior machine module.
In a word; all modules in multi-module system are all at the operation heating mode; when one of them module has reached the defrosting condition; cross valve outage in this module; enter defrosting; namely be converted into refrigeration mode by original heating mode; other modules keep heating mode, only have a module to heat in operation in multi-module system, and other modules are in shutdown mode; after the module of operation reaches the defrosting condition; the cross valve outage enters defrosting, namely is converted into refrigeration mode by original heating mode; other modules that are in stopped status start compressor, the operation heating mode.
Concrete steps:
Step S 1, at first makes the inside and outside machine of unit all be in heating mode;
Step S 2, judged whether that unit satisfies the defrosting condition, as then not getting back to step S1;
Whether step S 3, no matter have outer machine to satisfy the defrosting condition, make interior machine remain heating mode;
Step S 4, make the outer machine module that satisfies the defrosting condition enter Defrost operation;
Step S 7, judged whether that other modules are standby mode, if having then enter step S8, if not then enter step S9;
Step S 8, make the compressor start operation in the machine pack module of standby;
Beneficial effect of the present invention:
The module that the present invention can make Defrost operation in the whole unit when it defrosts in the required heat except electric energy, other heat is not to obtain by interior machine, but obtain by other modules that are in the state of heating in the system, and these modules that are in heating operation not only provide heat to the module of Defrost operation, improved also for simultaneously the indoor set that is moving and heat required heat, so the indoor set of this moment can normally carry out heating operation, guaranteeing that the indoor heating effect can not make a big impact to indoor temperature
The refrigerant of the suction side of Defrost operation module of the present invention no longer is that the liquid cooling matchmaker is with in the not evaporation of returning in the indoor completely, but the refrigerant of the part exhaust of other modules, so just do not have the risk of compressor band liquid operation, improve simultaneously pressure at expulsion and the delivery temperature of defrosting module, accelerated speed and the effect of defrosting
The present invention can be after defrosting finishes, and the unit front state that can recover rapidly to defrost has further reduced the fluctuation of indoor temperature during the defrosting.
Description of drawings
Fig. 1 is a kind of Modular multi-connected machine structural representation involved in the present invention, and illustrated outdoor machine system is three module combinations
Fig. 2 be the present invention during defrosting in the flow chart of the Modular multi-connected machine control method that normally heats of machine.
The specific embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
Shown in Fig. 1-2.
A kind of realize during the Modular multi-connected machine defrosting in the method that normally heats of machine, it may further comprise the steps:
1) whether at first, judging in the outer machine module of multi-connected machine has outer machine module to enter defrost state, and makes in addition that the machine module normally defrosts, and other module heating operations, interior machine normally carry out heating operation; Preferably make the quantity of off-premises station greater than the quantity of indoor set during implementation; Concrete operations comprise the cross valve of closing needs defrosting module, make the exhaust of this unit enter the frost that heat exchanger surface is removed in outdoor parallel operation heat release, after refrigerant flows through heat exchanger, directly flow to other modules that heating through ball valve, through after the throttling, again from the heat of the outdoor heat exchanger suction chamber external environment of the module that heating.
2) when the outer machine module of defrosting enters defrosting mode,, other modules keep the heating mode operation if being in heating mode, be in holding state if satisfy the defrosting conditioned disjunction, it is the cross valve switching that powered on, but because interior function power demand very little, compressor does not start, and then should force the outer machine module that is in standby or satisfied defrosting condition to enter heating mode, the compressor start operation; Control model is: the outer machine module of standby enters heating mode after receiving the signal that outer machine module begins to defrost, and according to interior function power demand, determines the unlatching capacity of compressor.
3) make the outer machine module that is in heating mode carry a part of heat to the outer machine module that is defrosting, to improve defrosting speed, another part then is delivered to indoor set, to guarantee the normal heating operation of interior machine.During the outer machine module defrosting, the refrigerant part that the compressor of the outer machine module that operation heats is discharged heats through ball valve to indoor set, a part is through the ball valve of the outer machine module of Defrost operation, the gas that enters the Defrost operation unit through cross valve divides, for the outer machine module that defrosts provides heat, accelerate defrosting speed.
The Modular multi-connected machine that machine normally heats in during the defrosting shown in Figure 1, comprise outdoor machine system and indoor set system that three outdoor unit modules form, adopt the system of three outdoor unit modules parallel connections among Fig. 1, interior machine is take two as example (quantity of machine is less than outer machine quantity namely), described outdoor unit modules is outer machine modules A (OU_1), outer machine module B (OU_2) and outer machine module C(OU_3), its China and foreign countries' machine modules A (OU_1) mainly comprise compressor (a1), outdoor heat exchanger (a5), cross valve (a4).Compressor (a1) refrigerant outlet and oil eliminator (a2) refrigerant inlet are joined, oil eliminator (a2) cold-producing medium middle outlet and cross valve (a4) import are joined, oil eliminator (a2) oil export and gas-liquid separator (a1) outlet are joined, be provided with check valve (a3) on the pipeline between oil eliminator (a2) and the cross valve (a4), cross valve (a4) outlet is joined with outdoor heat exchanger (a5) refrigerant inlet, outdoor heat exchanger (a5) adopts electric motor fan assembly (a6) to carry out forced heat-exchanging, outdoor heat exchanger (a5) outlet respectively with outdoor electric expansion valve (a8), check valve (a7) joins, and the outlet of outdoor electric expansion valve (a8) and check valve (a7) converges into one the tunnel and joins with ball valve (a9) entrance.Outer machine module B (OU_2), outer machine module C(OU_3) identical with outer machine modules A (OU_1) structure, ball valve (a9), ball valve (b9), after gathering, ball valve (c9) links to each other with indoor set system IN, elder generation's connecting electronic expansion valve (i1), electric expansion valve (i6), respectively with indoor machine evaporation (i3), (i4) link to each other, indoor fan (i2) and indoor fan (i5) are the heat exchange fan, indoor evaporator (i3), (i4) gather rear respectively with off-premises station ball valve (a10), ball valve (b10), ball valve (c10) links to each other respectively, ball valve (a10) links to each other with cross valve (a4), cross valve (a4), the S end divides (a12) to link to each other with gas, and gas divides (12) to link to each other with compressor (a1) air entry
Fig. 2 be during defrosting in the flow chart of the Modular multi-connected machine control method that normally heats of machine.
Step S 1, and the inside and outside machine of unit all is in heating mode
Step S 2, judged whether that unit satisfies the defrosting condition, as then not getting back to S1
Whether step S 3, no matter have outer machine to satisfy the defrosting condition, and interior machine remains heating mode
Step S 4, and the outer machine module that satisfies the defrosting condition enters the defrosting condition
Step S 7, judged whether that other modules are standby mode, if having then enter step S8; If not then enter step S9
Step S 8, compressor start operation in the module of standby
Be further described specifically below in conjunction with accompanying drawing 1 and Fig. 2:
The state of unit: outer machine modules A (OU_1) satisfies the defrosting condition, outer machine module B(OU_2) be in heating mode, outer machine module C(OU_3) be in standby mode;
Step S 1, and the inside and outside machine of unit all is in heating mode;
Step S 2, judged whether that unit satisfies the defrosting condition, and outer machine modules A this moment (OU_1) satisfies the defrosting condition;
Whether step S 3, no matter have outer machine to satisfy the defrosting condition, and interior machine remains heating mode;
Step S 4, the outer machine module that satisfies the defrosting condition enters the defrosting condition, outer machine modules A this moment (OU_1) satisfies the defrosting condition, cross valve (a4) outage, the refrigerant that compressor (a1) is discharged is through oil content (a2), check valve (a3), cross valve (a4) flowed into chamber external heat exchanger (a5), this moment outdoor fan (a6), out of service, to improve condensing pressure, improve defrosting effect, the condensed refrigerant of heat release is through check valve (a7) in heat exchanger (a5), ball valve (a9), flow out outer machine modules A (OU_1), flow into outer machine module B(OU_2 through ball valve (b9)), through flowing into outdoor heat exchanger (b5) evaporation endothermic after electric expansion valve (b8) throttling.Outer machine module B(OU_2) gaseous coolant of compressor (b1) discharge flows out outer machine module B(OU_2 through oil content (b2), check valve (b3), cross valve (b4), ball valve (b10)), a part is to indoor set (IN), heat through indoor heat exchanger (i3) and indoor heat exchanger (i4), machine-processed thermal effect in the holding chamber, a part flows into gas through ball valve a (10), cross valve (a4) and divides (a12), for the outer machine modules A (OU_1) that is defrosting provides heat;
Step S 7, judged whether that other modules are standby mode, if having then enter step S8; If not then enter step S9;
Step S 8, compressor start operation in the module of standby, outer machine module C(OU_3) be in standby mode, receive outer machine modules A (OU_1) defrosting signal after, start compressor (C1), cold medium flux wherein is with outer machine module B(OU_1);
In sum, in the method for the present invention, if there is module to need defrosting in the heating process, this directly switches cross valve and enters the Defrost operation pattern, if being in heating mode, other modules continue to keep, if be in the standby module, then start compressor and enter heating mode, its condensed refrigerant of pattern of defrosting evaporates with regard to not needing to enter indoor set like this, can evaporate in other modules that are in heating mode of off-premises station, guaranteed normally heating operation of indoor set, do not needed to shut down and wait for that defrosting finishes just can heat; A refrigerant part of moving the module that heats is for interior machine-processed heat, a part is delivered to the outdoor unit modules that is defrosting, provide for it defrosting needed heat, avoid a large amount of liquid refrigerants to get back to the off-premises station of Defrost operation, improve simultaneously the efficient of defrosting, shortened the time of Defrost operation.Such defrosting control method can reduce defrost process to greatest extent on system, on the impact of indoor environment temperature, has improved to greatest extent user's comfortableness.
The part that the present invention does not relate to all prior art that maybe can adopt same as the prior art is realized.
Claims (6)
- One kind realize during the Modular multi-connected machine defrosting in the method that normally heats of machine, it is characterized in that it may further comprise the steps:1) whether at first, judging in the outer machine module of multi-connected machine has outer machine module to enter defrost state, and makes in addition that the machine module normally defrosts, and other module heating operations, interior machine normally carry out heating operation;2) when the outer machine module of defrosting enters defrosting mode,, other modules keep the heating mode operation if being in heating mode, be in holding state if satisfy the defrosting conditioned disjunction, it is the cross valve switching that powered on, but because interior function power demand very little, compressor does not start, and then should force the outer machine module that is in standby or satisfied defrosting condition to enter heating mode, the compressor start operation;3) make the outer machine module that is in heating mode carry a part of heat to the outer machine module that is defrosting, to improve defrosting speed, another part then is delivered to indoor set, to guarantee the normal heating operation of interior machine.
- 2. the method for claim 1, the operation control step that it is characterized in that described step 1) is: the cross valve of closing needs defrosting module, make the exhaust of this unit enter the frost that heat exchanger surface is removed in outdoor parallel operation heat release, after refrigerant flows through heat exchanger, directly flow to other modules that heating through ball valve, through after the throttling, again from the heat of the outdoor heat exchanger suction chamber external environment of the module that heating.
- 3. the method for claim 1, it is characterized in that: operation control step described step 2) is: the outer machine module of standby is after receiving the signal that outer machine module begins to defrost, enter heating mode, according to interior function power demand, determine the unlatching capacity of compressor.
- 4. the method for claim 1, it is characterized in that: during the outer machine module defrosting of described step 3), the refrigerant part that the compressor of the outer machine module that operation heats is discharged heats through ball valve to indoor set, a part is through the ball valve of the outer machine module of Defrost operation, the gas that enters the Defrost operation unit through cross valve divides, for the outer machine module that defrosts provides heat, accelerate defrosting speed.
- 5. the method for claim 1, it is characterized in that: the quantity of described outer machine module is greater than the quantity of interior machine module.
- 6. the method for claim 1 is characterized in that it comprises following concrete steps:Step S 1, at first makes the inside and outside machine of unit all be in heating mode;Step S 2, judged whether that unit satisfies the defrosting condition, as then not getting back to step S1;Whether step S 3, no matter have outer machine to satisfy the defrosting condition, make interior machine remain heating mode;Step S 4, make the outer machine module that satisfies the defrosting condition enter Defrost operation;Step S 5, judged whether that other modules also reach the defrosting condition;Step S 6, make the module of rear satisfied defrosting condition keep heating operation, wait for defrosting;Step S 7, judged whether that other modules are standby mode, if having then enter step S8, if not then enter step S9;Step S 8, make the compressor start operation in the machine pack module of standby;Step S 9, make the module of heating operation keep the heating operation pattern;Step S 10, reach the defrosting exit criteria, and unit is got back to heating mode, enter step S1.
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| CN109798703B (en) * | 2019-01-15 | 2021-03-02 | 广东芬尼克兹节能设备有限公司 | Heat pump unit and defrosting control method and device thereof |
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| CN110645675B (en) * | 2019-09-23 | 2021-02-02 | 南京天加环境科技有限公司 | Improved defrosting control method for air conditioner |
| CN112484238A (en) * | 2020-11-16 | 2021-03-12 | 珠海格力电器股份有限公司 | Defrosting control method and device, multi-module unit and heating and ventilation equipment |
| CN112539520A (en) * | 2020-12-17 | 2021-03-23 | 珠海格力电器股份有限公司 | Defrosting control method and device and multi-split air conditioner |
| CN112539520B (en) * | 2020-12-17 | 2021-10-22 | 珠海格力电器股份有限公司 | Defrosting control method and device and multi-split air conditioner |
| WO2022127309A1 (en) * | 2020-12-17 | 2022-06-23 | 珠海格力电器股份有限公司 | Defrosting control method and device, and vrf air conditioner |
| CN112984595A (en) * | 2021-03-10 | 2021-06-18 | 青岛海信日立空调系统有限公司 | Ground heating unit |
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