CN104110367A - Low-pressure-chamber compressor system and superheat degree control method thereof and outdoor unit - Google Patents
Low-pressure-chamber compressor system and superheat degree control method thereof and outdoor unit Download PDFInfo
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- CN104110367A CN104110367A CN201310140693.XA CN201310140693A CN104110367A CN 104110367 A CN104110367 A CN 104110367A CN 201310140693 A CN201310140693 A CN 201310140693A CN 104110367 A CN104110367 A CN 104110367A
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Abstract
The invention discloses a low-pressure-chamber compressor system. The low-pressure-chamber compressor system comprises a low-pressure-chamber compressor, an oil heating device, a first temperature sensor, a second temperature sensor and a control module. The oil heating device is arranged at the bottom of the low-pressure-chamber compressor; the first temperature sensor is arranged at a muffler of the low-pressure-chamber compressor and used for detecting the back temperature of the muffler of the low-pressure-chamber compressor at intervals of a preset period; the second temperature sensor is arranged at the bottom of the low-pressure-chamber compressor or the oil heating device and used for detecting the oil temperature of the low-pressure-chamber compressor at intervals of a preset period; the control module is used for computing the degree of superheat of the low-pressure-chamber compressor at intervals of a preset period according to the back temperature and the oil temperature and controlling on or off of the oil heating device according to the degree of superheat. The invention further discloses an outdoor unit and a superheat degree control method of the low-pressure-chamber compressor system. The oil heating device can be accurately started when lubricant in the low-pressure-chamber compressor needs to be heated and can be stopped when not needed, and accordingly energy sources can be saved, so that energy consumption is reduced, and accuracy in control and simplicity and convenience in operation are achieved.
Description
Technical field
The present invention relates to air-conditioning technical field, particularly the control method for overheat of a kind of low-pressure cavity compressor system, this low-pressure cavity compressor system and there is the outdoor unit of this low-pressure cavity compressor system.
Background technique
Compressor is in the time doing cold start lower than 6 DEG C, and in particularly winter, lubricant oil and liquid refrigerants can fuse, and cause lubricant movement reduced viscosity, and compressor long-time running is easy to wear, even there will be liquid hit phenomenon.For fear of the generation of this situation, existing compressor generally all disposes oil temperature heating tape, adds the lubricant oil of thermocompressor during for low temperature, makes its kinematical viscosity can be applicable to the requirement of compressor lubrication.
The method that on market, conventional control compressor oil temperature heating tape opens and closes now comprises following several:
1, open in the time that air-conditioning system powers on compressor oil temperature heating tape, in the time of air-conditioning system power-off, closes.
Obviously, fully separate with refrigerant though this controlling method can ensure compressor lubricant oil in the time opening, lubricating oil flow is good, but long-term superheating is not only wasted electric energy, even can destroy the lubricated attribute of lubricant oil, be unfavorable for the action of moving element, affect the compressor life-span.
2, open in the time that air-conditioning outer machine starts compressor oil temperature heating tape, in the time that air-conditioning outer machine is shut down, closes.
There is critical defect in this controlling method: compressor for example, when under lower ambient temperature, (: winter) does cold start, and because just opening oil temperature heating tape, lubricant oil not yet fully heats.Run up in process at compressor, lubricant oil and refrigerant are fused can produce bubble, and then causes lubricant movement reduced viscosity.Compressor long-time running is easy to wear, affects the life-span, even there will be liquid hit phenomenon.
3, compressor oil temperature heating tape is according to its open and close of compressor ambient temperature control.
Before air-conditioning system starts, temperature transducer can detect compressor ambient temperature, if the ambient temperature detecting lower than setting value, compressor oil temperature heating tape open, until compressor ambient temperature reaches setting value, close oil temperature heating tape; If the ambient temperature detecting is higher than setting value, compressor oil temperature heating tape keeps closed condition.There is control lag phenomenon in the method: can not be in time, accurately according to the open and close of the running state control oil temperature heating tape of compressor, and long-time running meeting affects the compressor life-span, and has to a certain extent the phenomenon of waste electric energy.
Summary of the invention
The present invention is intended to one of solve the problems of the technologies described above at least to a certain extent.First object of the present invention is to provide a kind of low-pressure cavity compressor system, and this low-pressure cavity compressor system can energy saving, reduces energy consumption, and controls accurately, easy and simple to handle.Second object of the present invention is to provide a kind of outdoor unit.The 3rd object of the present invention is to provide a kind of control method for overheat of low-pressure cavity compressor system.
For achieving the above object, the embodiment of first aspect present invention provides a kind of low-pressure cavity compressor system, comprising:
Low-pressure cavity compressor;
Oil temperature heating equipment, described oil temperature heating equipment is arranged at the bottom of described low-pressure cavity compressor;
The first temperature transducer, described the first temperature transducer is arranged on the muffler place of described low-pressure cavity compressor, for detect the suction temperature of the muffler of described low-pressure cavity compressor every predetermined period;
The second temperature transducer, described the second temperature transducer is arranged on the bottom or described oil temperature heating equipment of described low-pressure cavity compressor, for detect the oil temperature temperature of described low-pressure cavity compressor every described predetermined period; And
Control module, described control module is electrically connected with described the first temperature transducer, the second temperature transducer and described oil temperature heating equipment, for every described predetermined period according to the degree of superheat of low-pressure cavity compressor described in described suction temperature and described oil temperature temperature computation, and according to described in the described degree of superheat control oil temperature heating equipment open or close.
According to the low-pressure cavity compressor system of the embodiment of the present invention, can ensure that low-pressure cavity compressor starts time, the kinematical viscosity of lubricant oil can be applicable to the requirement of compressor lubrication.Adopt the degree of superheat control gear of the low-pressure cavity compressor of the embodiment of the present invention, both can in the time that needs heat low-pressure cavity compressor lubricant oil, open accurately oil temperature heating tape and close while not needing, thus can energy saving, reduce energy consumption, and control accurately, easy and simple to handle.In addition,, when the low-pressure cavity compressor system of the embodiment of the present invention can prevent low-pressure cavity compressor cold start again effectively, lubricant oil and liquid refrigerants are fused causes lubricant movement reduced viscosity, even there will be liquid hit phenomenon, has improved the working life of compressor.
Wherein, described oil temperature heating equipment is oil temperature heating tape.
And control module comprises: computing unit, for according to the degree of superheat of low-pressure cavity compressor described in described suction temperature and described oil temperature temperature computation; Control unit, described control unit is connected with described computing unit electricity, for opening or close according to oil temperature heating equipment described in described degree of superheat control.
Wherein, the described computing unit calculating degree of superheat is: the described degree of superheat=described oil temperature temperature-described suction temperature.
Particularly, described control unit is used for judging whether the described degree of superheat is less than or equal to default unlatching value, if so, controls described oil temperature heating equipment and opens; Described control unit is also for judging that whether the described degree of superheat is greater than default unlatching value, if so, controls described oil temperature heating equipment and closes.
The embodiment of second aspect present invention provides a kind of outdoor unit, comprising: the low-pressure cavity compressor system that first aspect of the present invention embodiment provides; Four-way valve, the exhaust end of described four-way valve is connected with the outlet pipe of the low-pressure cavity compressor of described low-pressure cavity compressor system; Heat exchanger, one end of described heat exchanger is connected with the condenser end of described four-way valve; Throttle part, one end of described throttle part is connected with the other end of described heat exchanger; The first stop valve, described the first stop valve is connected with the other end of described throttle part; The second stop valve, described the second stop valve is connected with the evaporator end of described four-way valve; Gas-liquid separator, described gas-liquid separator is connected with the muffler of the air-breathing pipe end of described four-way valve and the low-pressure cavity compressor of described low-pressure cavity compressor system.
According to the outdoor unit of the embodiment of the present invention, can ensure that low-pressure cavity compressor starts time, the kinematical viscosity of lubricant oil can be applicable to the requirement of compressor lubrication.Adopt the degree of superheat control gear of the low-pressure cavity compressor of the embodiment of the present invention, both can in the time that needs heat low-pressure cavity compressor lubricant oil, open accurately oil temperature heating tape and close while not needing, thus can energy saving, reduce energy consumption, and control accurately, easy and simple to handle.In addition,, when the outdoor unit of the embodiment of the present invention can prevent low-pressure cavity compressor cold start again effectively, lubricant oil and liquid refrigerants are fused causes lubricant movement reduced viscosity, even there will be liquid hit phenomenon, has improved the working life of compressor.
Third aspect present invention embodiment provides the control method for overheat of a kind of first aspect present invention embodiment's low-pressure cavity compressor system, and wherein, this controlling method, every predetermined period, is carried out following steps:
Detect the suction temperature of muffler and the oil temperature temperature of described low-pressure cavity compressor of described low-pressure cavity compressor;
According to the degree of superheat of low-pressure cavity compressor described in described suction temperature and described oil temperature temperature computation; And
Open or close according to oil temperature heating equipment described in described degree of superheat control.
According to the control method for overheat of the low-pressure cavity compressor system of the embodiment of the present invention, can ensure that low-pressure cavity compressor starts time, the kinematical viscosity of lubricant oil can be applicable to the requirement of compressor lubrication.Adopt the degree of superheat control gear of the low-pressure cavity compressor of the embodiment of the present invention, both can in the time that needs heat low-pressure cavity compressor lubricant oil, open accurately oil temperature heating tape and close while not needing, thus can energy saving, reduce energy consumption, and control accurately, easy and simple to handle.In addition, when the control method for overheat of the low-pressure cavity compressor system of the embodiment of the present invention can prevent low-pressure cavity compressor cold start again effectively, lubricant oil and liquid refrigerants are fused causes lubricant movement reduced viscosity, even there will be liquid hit phenomenon, has improved the working life of compressor.
Particularly, oil temperature heating equipment is positioned at the bottom of described low-pressure cavity compressor.
In addition, the computational methods of the described degree of superheat are: the described degree of superheat=described oil temperature temperature-described suction temperature.
And, described according to described in the described degree of superheat control oil temperature heating equipment open or close, comprise the steps:
Judge that whether the described degree of superheat is less than or equal to default unlatching value, if so, opens described oil temperature heating equipment;
Judge whether the described degree of superheat is greater than or default unlatching value, if so, close described oil temperature heating equipment.
Additional aspect of the present invention and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Brief description of the drawings
Above-mentioned and/or additional aspect of the present invention and advantage accompanying drawing below combination is understood becoming embodiment's description obviously and easily, wherein:
Fig. 1 is according to the schematic diagram of the low-pressure cavity compressor system of the embodiment of the present invention;
Fig. 2 is the system schematic of the outdoor unit of separate unit low-pressure cavity compressor system shown in the application drawing 1 of the embodiment of the present invention;
Fig. 3 is the system schematic of the outdoor unit of many low-pressure cavity compressor systems shown in the application drawing 1 of another embodiment of the present invention; And
Fig. 4 is the flow chart of the control method for overheat of the low-pressure cavity compressor system of the embodiment of the present invention.
Reference character:
1: the first low-pressure cavity compressor outlet pipe; 2: low-pressure cavity compressor muffler; 3: the first temperature transducers;
4: the first oil temperature heating tapes; 5: the second temperature transducers; 6: the first low-pressure cavity compressors;
8: four-way valve; 9: heat exchanger; 10: throttle part; 11,12: stop valve;
13: gas-liquid separator; 15: the second low-pressure cavity compressors;
16: the second oil temperature heating tapes.
Embodiment
Describe embodiments of the invention below in detail, described embodiment's example is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Be exemplary below by the embodiment who is described with reference to the drawings, be intended to for explaining the present invention, and can not be interpreted as limitation of the present invention.
In description of the invention, it will be appreciated that, term " " center ", " longitudinally ", " laterally ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", orientation or the position relationship of instructions such as " counterclockwise " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of device or the element of instruction or hint indication must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as limitation of the present invention.
In addition, term " first ", " second " be only for describing object, and can not be interpreted as instruction or hint relative importance or the implicit quantity that indicates indicated technical characteristics.Thus, one or more these features can be expressed or impliedly be comprised to the feature that is limited with " first ", " second ".In description of the invention, the implication of " multiple " is two or more, unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the terms such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and for example, can be to be fixedly connected with, and can be also to removably connect, or connect integratedly; Can be mechanical connection, can be also electrical connection; Can be to be directly connected, also can indirectly be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, can understand as the case may be above-mentioned term concrete meaning in the present invention.
In the present invention, unless otherwise clearly defined and limited, First Characteristic Second Characteristic it " on " or D score can comprise that the first and second features directly contact, also can comprise that the first and second features are not directly contacts but by the other feature contact between them.And, First Characteristic Second Characteristic " on ", " top " and " above " comprise First Characteristic directly over Second Characteristic and oblique upper, or only represent that First Characteristic level height is higher than Second Characteristic.First Characteristic Second Characteristic " under ", " below " and " below " comprise First Characteristic directly over Second Characteristic and oblique upper, or only represent that First Characteristic level height is less than Second Characteristic.
Describe according to the low-pressure cavity compressor system of the embodiment of the present invention below with reference to Fig. 1.
As shown in Figure 1, the low-pressure cavity compressor system of the embodiment of the present invention comprises the first temperature transducer 3, oil temperature heating equipment 4, the second temperature transducer 5, low-pressure cavity compressor 6 and control module (not shown).
Particularly, oil temperature heating equipment 4 is arranged on the bottom of low-pressure cavity compressor 6.Oil temperature heating equipment 4 can heat the lubricant oil in low-pressure cavity compressor 6, thereby makes the kinematical viscosity of lubricant oil can be applicable to the lubricating requirement of low-pressure cavity compressor 6.In an example of the present invention, oil temperature heating equipment 4 can be oil temperature heating tape.Be understandable that, oil temperature heating equipment 4 is not limited to above-mentioned example, can also be the device that the temperature of lubricant oil is heated that has of other shapes or structure.
The first temperature transducer 3 is arranged on muffler 2 places of low-pressure cavity compressor 6, for detect the suction temperature Tp1 of the muffler 2 of low-pressure cavity compressor 6 every predetermined period.
The second temperature transducer 5 is arranged on the bottom or oil temperature heating equipment 4 of low-pressure cavity compressor 6, for detect the oil temperature temperature Tp 2 of low-pressure cavity compressor 6 or oil temperature heating equipment 4 every predetermined period.
Control module is connected with the first temperature transducer 3, oil temperature heating equipment 4 and the second temperature transducer 5, for calculate the Δ of crossing of low-pressure cavity compressor 6 according to suction temperature Tp1 and oil temperature temperature Tp 2 every predetermined period, and open or close according to degree of superheat Δ control oil temperature heating equipment 4.
In examples more of the present invention, predetermined period can be 20 seconds.
In one embodiment of the invention, control module comprises: computing unit and control unit.Particularly, computing unit is used for according to the degree of superheat of suction temperature and oil temperature temperature computation low-pressure cavity compressor.Wherein, the degree of superheat=oil temperature temperature-suction temperature, i.e. Δ=Tp2-Tp1.Control unit is connected with computing unit, for opening or close according to degree of superheat Δ control oil temperature heating tape.
Particularly, control unit judges whether degree of superheat Δ is less than or equal to default unlatching value, if so, controls oil temperature heating tape and opens, heating low-pressure cavity compressor lubricant oil; Otherwise, keep present situation.In addition, control unit also, for judging the whether default unlatching value of degree of superheat Δ, if so, is controlled oil temperature heating tape and is closed, and stops heating low-pressure cavity compressor lubricant oil; Otherwise, keep present situation.Wherein, default unlatching value can be 10 degree.
The first temperature transducer 3, the second temperature transducer 5 and control module repeat above-mentioned action every predetermined period, so circulation, thereby the control that can realize the unlatching to oil temperature heating equipment or close, and then make the kinematical viscosity of lubricant oil can be applicable to the lubricating requirement of low-pressure cavity compressor 6.
In the time that low-pressure cavity compressor starts, the every suction temperature Tp1 that detects low-pressure cavity compressor muffler 2 places through predetermined period Δ t of the first temperature transducer 3, the every oil temperature temperature Tp 2 that detects 4 places, oil temperature heating tape, a low-pressure cavity compressor cavity bottom through predetermined period Δ t of the second temperature transducer 5, control module is calculated the degree of superheat Δ of low-pressure cavity compressor, wherein, Δ=Tp2-Tp1.
When low-pressure cavity compressor 6 has just started, if low-pressure cavity compressor 6 temperature are lower, the lubricant oil in low-pressure cavity compressor and refrigerant temperature are also lower, be that control module is while judging low-pressure cavity compressor degree of superheat Δ lower than default unlatching value a, Δ≤a, reach the condition of opening oil temperature heating tape, control module is opened oil temperature heating equipment, heating low-pressure cavity compressor lubricant oil; If control module judges low-pressure cavity compressor degree of superheat Δ and is greater than default unlatching value a always, i.e. Δ > a, without opening oil temperature heating equipment, keeps present situation.Wherein, a=10 degree.
Along with the growth of starting time of oil temperature heating equipment, low-pressure cavity compressor cavity temperature slowly raises, the oil temperature temperature Tp 2 at oil temperature heating equipment place rises gradually, when judging low-pressure cavity compressor degree of superheat Δ, control module is more than or equal to default close value b, while being Δ >=b, control module is closed oil temperature heating equipment, stops heating low-pressure cavity compressor lubricant oil; Otherwise i.e. Δ < b, continues to open oil temperature heating equipment, continue the heating of low-pressure cavity compressor lubricant oil, until close again oil temperature heating equipment while meeting Δ >=b.
According to the low-pressure cavity compressor system of the embodiment of the present invention, can ensure that low-pressure cavity compressor starts time, the kinematical viscosity of lubricant oil can be applicable to the requirement of compressor lubrication.Adopt the degree of superheat control gear of the low-pressure cavity compressor of the embodiment of the present invention, both can in the time that needs heat low-pressure cavity compressor lubricant oil, open accurately oil temperature heating tape and close while not needing, thus can energy saving, reduce energy consumption, and control accurately, easy and simple to handle.In addition,, when the low-pressure cavity compressor system of the embodiment of the present invention can prevent low-pressure cavity compressor cold start again effectively, lubricant oil and liquid refrigerants are fused causes lubricant movement reduced viscosity, even there will be liquid hit phenomenon, has improved the working life of compressor.
Below with reference to Fig. 2 and Fig. 3, the outdoor unit of the embodiment of the present invention is described.
As shown in Figure 2, the outdoor unit that the embodiment of the present invention provides comprises: low-pressure cavity compressor system, four-way valve 8, heat exchanger 9, throttle part 10, the first stop valve 11, the second stop valve 12 and the gas-liquid separator 13 of the above embodiment of the present invention.Four-way valve 8 comprises exhaust end (d), condenser end (c), evaporator end (e) and air-breathing pipe end (s), and gas-liquid separator 13 comprises suction port and air outlet.The outlet pipe 1 of the first low-pressure cavity compressor 6 is connected with the exhaust end (d) of four-way valve 8.One end of heat exchanger 9 is connected with the condenser end (c) of four-way valve 8, one end of throttle part 10 is connected with the other end of heat exchanger 9, the first stop valve 11 is connected with the other end of throttle part 10, the second stop valve 12 is connected with the evaporator end (e) of four-way valve 8, and gas-liquid separator 12 connects for the air-breathing pipe end (s) of four-way valve 8.The air outlet of gas-liquid separator 13 is connected with the muffler 2 of the first low-pressure cavity compressor 6.The other end of heat exchanger 9 is connected in series with throttle part 10 and the first stop valve 11 successively.
Taking process of refrigerastion as example, the workflow of the outdoor unit to the embodiment of the present invention is described below.When refrigeration, the pressurized gas that the outlet pipe 1 of compressor is discharged.Pressurized gas are drawn oil separator through the pipe at many neutrals Ban You center.Working medium gas carries out heat exchange through four-way valve 8 to heat exchanger 9, makes superheated vapor become gradually saturated vapour, and then becomes saturated liquids or overcooled liquid.Enter indoor set heat exchanger by the refrigerant liquid after capillary-compensated step-down to the first stop valve of outdoor unit, flash to gas from environment heat absorption, realize refrigeration.In evaporation process, the temperature and pressure of refrigeration agent remains unchanged.Dry saturated vapor or the superheated vapor of the degree of superheat are slightly become from indoor set heat exchanger refrigeration agent out.Indoor set return-air: the muffler 2 of low-pressure cavity compressor 6 enters four-way valve 8 to outdoor unit via the second stop valve 12 and completes refrigeration cycle to compressor low pressure return-air side.Gas-liquid separator 13 is arranged on muffler 2 places of low-pressure cavity compressor 6, for gas-liquid separation.
In one embodiment of the invention, between low-pressure cavity compressor system 6 and four-way valve 8, can also be provided with oil separator, wherein, one end of oil separator is connected with the outlet pipe of low-pressure cavity compressor system 6, and the other end is connected with the exhaust end (d) of four-way valve 8.
Taking process of refrigerastion as example, the workflow of the outdoor unit to the embodiment of the present invention is described below.When refrigeration, the pressurized gas that the outlet pipe 1 of compressor is discharged enter after oil separator, enter the directing vane of oil separator, flow in the shape of a spiral along directing vane, by centrifugal force and gravity, lubricant oil are separated from Working medium gas, flow down along the inwall of cylindrical shell.Working medium gas is drawn oil separator through the pipe at many neutrals Ban You center.Working medium gas carries out heat exchange through four-way valve 8 to heat exchanger 9, makes superheated vapor become gradually saturated vapour, and then becomes saturated liquids or overcooled liquid.Enter indoor set heat exchanger by the refrigerant liquid after capillary-compensated step-down to the first stop valve of outdoor unit, flash to gas from environment heat absorption, realize refrigeration.In evaporation process, the temperature and pressure of refrigeration agent remains unchanged.Dry saturated vapor or the superheated vapor of the degree of superheat are slightly become from indoor set heat exchanger refrigeration agent out.Indoor set return-air: the muffler 2 of low-pressure cavity compressor 6 enters four-way valve 8 to outdoor unit via the second stop valve 12 and completes refrigeration cycle to compressor low pressure return-air side.Gas-liquid separator 13 is arranged on muffler 2 places of low-pressure cavity compressor 6, for gas-liquid separation.
In the time that low-pressure cavity compressor 6 starts, the every suction temperature Tp1 that detects low-pressure cavity compressor muffler 2 places through predetermined period Δ t of the first temperature transducer 3, the every oil temperature temperature Tp 2 that detects oil temperature heating equipment 4 places, a low-pressure cavity compressor cavity bottom through predetermined period Δ t of the second temperature transducer 5, and calculate the degree of superheat Δ of low-pressure cavity compressor 6, wherein, Δ=Tp2-Tp1.
When low-pressure cavity compressor 6 has just started, if low-pressure cavity compressor 6 temperature are lower, the lubricant oil in low-pressure cavity compressor 6 and refrigerant temperature are also lower, be that low-pressure cavity compressor degree of superheat Δ is lower than default unlatching value a, Δ≤a, reach the condition of opening oil temperature heating equipment 4, open oil temperature heating equipment 4, heating low-pressure cavity compressor lubricant oil; If low-pressure cavity compressor degree of superheat Δ is greater than default unlatching value a always, i.e. Δ > a,, without opening oil temperature heating equipment 4, keeps present situation.Wherein, a=10 degree.
Along with the growth of 4 starting times of oil temperature heating equipment, low-pressure cavity compressor 6 cavity temperatures slowly raise, the oil temperature temperature Tp 2 at oil temperature heating equipment 4 places rises gradually, when low-pressure cavity compressor degree of superheat Δ is more than or equal to default close value b, while being Δ >=b, close oil temperature heating equipment 4, stop heating low-pressure cavity compressor lubricant oil; Otherwise i.e. Δ < b, continues to open oil temperature heating equipment 4, continue the heating of low-pressure cavity compressor lubricant oil, until close again oil temperature heating equipment 4 while meeting Δ >=b
It should be noted that, Fig. 2 is the system schematic of the outdoor unit of the separate unit low-pressure cavity compressor system shown in application drawing 1.The present invention also proposes a kind of outdoor unit of applying the low-pressure cavity compressor system shown in many Fig. 1.
Each low-pressure cavity compressor is to there being an oil temperature heating equipment, can adopt two temperature transducers to realize suction temperature to the primary low cavity compressor in system and the detection of oil temperature temperature, thereby by the degree of superheat of primary low cavity compressor is detected, control the open and close of the oil temperature heating equipment of all low-pressure cavity compressors in this system.Adopt two temperature temperature transducers to realize oil temperature temperature to two low-pressure cavity compressors and the detection of suction temperature.
As shown in Figure 3, the outdoor unit that the embodiment of the present invention provides comprises: low-pressure cavity compressor system, four-way valve 8, heat exchanger 9, throttle part 10, the first stop valve 11, the second stop valve 12 and the gas-liquid separator 13 of two the above embodiment of the present invention, wherein two low-pressure cavity compressor systems are respectively the first low-pressure cavity compressor 6 and the second low-pressure cavity compressor 15.Four-way valve 8 comprises exhaust end (d), condenser end (c), evaporator end (e) and air-breathing pipe end (s), and gas-liquid separator 13 comprises suction port and air outlet.The outlet pipe 1 of the first low-pressure cavity compressor 6 is connected with the exhaust end (d) of four-way valve 8 with the outlet pipe of the second low-pressure cavity compressor 15.One end of heat exchanger 9 is connected with the condenser end (c) of four-way valve 8, one end of throttle part 10 is connected with the other end of heat exchanger 9, the first stop valve 11 is connected with the other end of throttle part 10, the second stop valve 12 is connected with the vaporizer (e) of four-way valve 8, and gas-liquid separator 12 connects for the air-breathing pipe end (s) of four-way valve 8.The air outlet of gas-liquid separator 13 is connected with the muffler 2 of the first low-pressure cavity compressor 6 and the outlet pipe of the second low-pressure cavity compressor 15.The other end of heat exchanger 9 is connected in series with throttle part 10 and the first stop valve 11 successively.
Oil temperature heating equipment 4 is placed in the first low-pressure cavity compressor 6 cavity bottoms, and the first temperature transducer 3 is placed in the first low-pressure cavity compressor muffler 2 places, and wherein the first temperature transducer 3 detects that this place's suction temperature is Tp1.The second temperature transducer 5 is placed in the bottom of the first low-pressure cavity compressor, and wherein, the second temperature transducer 5 detects that this place's oil temperature temperature is Tp2.Particularly, the second temperature transducer 5 is positioned at the lower position of low-pressure cavity compressor.
In the time that the first low-pressure cavity compressor 6 and the second low-pressure cavity compressor 15 are applied to air-conditioning system, its structural system as shown in Figure 4.Wherein, the first low-pressure cavity compressor 6 is primary low cavity compressor.Detect by the degree of superheat to the first low-pressure cavity compressor 6, control the open and close of the oil temperature heating equipment 4 of the first low-pressure cavity compressor in this system and the oil temperature heating equipment 16 of the second low-pressure cavity compressor 15, make the kinematical viscosity of lubricant oil can be applicable to the lubricating requirement of low-pressure cavity compressor.
Wherein, the same to the control method for overheat of the first low-pressure cavity compressor 6.Particularly, as shown in Figure 4, in the time that this first low-pressure cavity compressor 6 and the second low-pressure cavity compressor 5 start, control module is every detects the suction temperature Tp1 at first low-pressure cavity compressor 6 muffler 2 places and the oil temperature temperature Tp 2 at the first low-pressure cavity compressor 6 oil temperature heating equipment 4 places, cavity bottom through predetermined period Δ t, and calculate the degree of superheat Δ of the first low-pressure cavity compressor 6, i.e. Δ=Tp2-Tp1.
When the first low-pressure cavity compressor 6 and the second low-pressure cavity compressor 15 have just started, if the first low-pressure cavity compressor 6 and the second low-pressure cavity compressor 15 temperature are lower, lubricant oil and the refrigerant temperature of the inside are also lower, the first low-pressure cavity compressor 6 degree of superheat Δs are lower than certain unlatching value a, Δ≤a, reach the condition of opening the first oil temperature heating equipment 4 and the second oil temperature heating equipment 16, open the first oil temperature heating equipment 4 and the second oil temperature heating equipment 16, the lubricant oil of heating the first low-pressure cavity compressor 6 and the second low-pressure cavity compressor 15; If the first low-pressure cavity compressor 6 degree of superheat Δs are greater than certain unlatching value a always, i.e. Δ > a, without opening the first oil temperature heating equipment 4 and the second oil temperature heating equipment 16.Wherein, a=10 degree.
Along with the low-pressure cavity compressor growth of starting time, the first low-pressure cavity compressor 6 and the second low-pressure cavity compressor 15 cavity temperatures slowly raise, the oil temperature temperature Tp 2 at the first oil temperature heating equipment 4 places rises gradually, when the first low-pressure cavity compressor 6 degree of superheat Δs are more than or equal to certain close value b, while being Δ >=b, close an oil temperature heating equipment 4 and the second oil temperature heating equipment 16, stop heating the lubricant oil of the first low-pressure cavity compressor 6 and the second low-pressure cavity compressor 15; Otherwise, be Δ < b, continue to open the first oil temperature heating equipment 4 and the second oil temperature heating equipment 16, continue the first low-pressure cavity compressor 6 and the second low-pressure cavity compressor 15 lubricant oil heating, until close again the first oil temperature heating equipment 4 and the second oil temperature heating equipment 16 while meeting Δ >=b.
In one embodiment of the invention, between the outlet pipe of the first low-pressure cavity compressor system 6 and the exhaust end (d) of four-way valve 8, can be provided with oil separator, and also can be provided with oil separator between the outlet pipe of the second low-pressure cavity compressor system 15 and the exhaust end (d) of four-way valve 8.The workflow of outdoor unit can be with reference to the above-mentioned description to single low-pressure cavity compressor particularly.
According to the outdoor unit of the embodiment of the present invention, can ensure that low-pressure cavity compressor starts time, the kinematical viscosity of lubricant oil can be applicable to the requirement of compressor lubrication.Adopt the degree of superheat control gear of the low-pressure cavity compressor of the embodiment of the present invention, both can in the time that needs heat low-pressure cavity compressor lubricant oil, open accurately oil temperature heating tape and close while not needing, thus can energy saving, reduce energy consumption, and control accurately, easy and simple to handle.In addition,, when the outdoor unit of the embodiment of the present invention can prevent low-pressure cavity compressor cold start again effectively, lubricant oil and liquid refrigerants are fused causes lubricant movement reduced viscosity, even there will be liquid hit phenomenon, has improved the working life of compressor.
Below with reference to Fig. 4, the control method for overheat of the low-pressure cavity compressor system that above-described embodiment is provided of the present invention is described.
As shown in Figure 4, the control method for overheat of the low-pressure cavity compressor system of the embodiment of the present invention, each predetermined period, wherein, predetermined period can be 20 seconds, carries out following steps:
Step S101, the suction temperature of muffler and the oil temperature temperature of low-pressure cavity compressor of detection low-pressure cavity compressor.Wherein, the oil temperature temperature of low-pressure cavity compressor is the temperature of the lubricant oil of low-pressure cavity compressor inside.
Step S102, according to the degree of superheat of suction temperature and oil temperature temperature computation low-pressure cavity compressor.
In one embodiment of the invention, degree of superheat computational methods are as follows: the degree of superheat=oil temperature temperature-suction temperature.
Step S103, according to the unlatching of degree of superheat control oil temperature heating tape or close.Wherein, oil temperature heating tape is positioned at the bottom of low-pressure cavity compressor.Oil temperature heating tape can be heated the lubricant oil in low-pressure cavity compressor, thereby makes the kinematical viscosity of lubricant oil can be applicable to the lubricating requirement of low-pressure cavity compressor.
Particularly, judge whether the degree of superheat is less than or equal to default unlatching value, and for example 10 degree, if so, open oil temperature heating tape, heating low-pressure cavity compressor lubricant oil; Otherwise, keep present situation.
Judge whether the degree of superheat is greater than default unlatching value, and for example 10 degree, if so, close oil temperature heating tape, stop heating low-pressure cavity compressor lubricant oil; Otherwise, keep present situation.
Repeated above-mentioned steps S101 to step S103 every 20 seconds, so circulation, thereby the control that can realize the unlatching to oil temperature heating tape or close, and then make the kinematical viscosity of lubricant oil can be applicable to the lubricating requirement of low-pressure cavity compressor.
With reference to figure 2, in the time that low-pressure cavity compressor 6 starts, the every suction temperature Tp1 that detects low-pressure cavity compressor muffler 2 places through predetermined period Δ t of the first temperature transducer 3, the every oil temperature temperature Tp 2 that detects 4 places, oil temperature heating tape, a low-pressure cavity compressor cavity bottom through predetermined period Δ t of the second temperature transducer 5, and calculate the degree of superheat Δ of low-pressure cavity compressor 6, wherein, Δ=Tp2-Tp1.
When low-pressure cavity compressor 6 has just started, if low-pressure cavity compressor 6 temperature are lower, the lubricant oil in low-pressure cavity compressor 6 and refrigerant temperature are also lower, be that low-pressure cavity compressor degree of superheat Δ is lower than default unlatching value a, Δ≤a, reach the condition of opening oil temperature heating tape 4, open oil temperature heating tape 4, heating low-pressure cavity compressor lubricant oil; If low-pressure cavity compressor degree of superheat Δ is greater than default unlatching value a always, i.e. Δ > a,, without opening oil temperature heating tape 4, keeps present situation.Wherein, a=10 degree.
Along with the growth of 4 starting times of oil temperature heating tape, low-pressure cavity compressor 6 cavity temperatures slowly raise, the oil temperature temperature Tp 2 at 4 places, oil temperature heating tape rises gradually, when low-pressure cavity compressor degree of superheat Δ is more than or equal to default close value b, while being Δ >=b, close oil temperature heating tape 4, stop heating low-pressure cavity compressor lubricant oil; Otherwise i.e. Δ < b, continues to open oil temperature heating tape 4, continue low-pressure cavity compressor lubricant oil heating, until close again oil temperature heating tape 4 while meeting Δ >=b.
According to the control method for overheat of the low-pressure cavity compressor system of the embodiment of the present invention, can ensure that low-pressure cavity compressor starts time, the kinematical viscosity of lubricant oil can be applicable to the requirement of compressor lubrication.Adopt the degree of superheat control gear of the low-pressure cavity compressor of the embodiment of the present invention, both can in the time that needs heat low-pressure cavity compressor lubricant oil, open accurately oil temperature heating tape and close while not needing, thus can energy saving, reduce energy consumption, and control accurately, easy and simple to handle.In addition, when the control method for overheat of the low-pressure cavity compressor system of the embodiment of the present invention can prevent low-pressure cavity compressor cold start again effectively, lubricant oil and liquid refrigerants are fused causes lubricant movement reduced viscosity, even there will be liquid hit phenomenon, has improved the working life of compressor.
Any process of otherwise describing in flow chart or at this or method are described and can be understood to, represent to comprise that one or more is for realizing module, fragment or the part of code of executable instruction of step of specific logical function or process, and the scope of the preferred embodiment of the present invention comprises other realization, wherein can be not according to order shown or that discuss, comprise according to related function by the mode of basic while or by contrary order, carry out function, this should be understood by embodiments of the invention person of ordinary skill in the field.
The logic and/or the step that in flow chart, represent or otherwise describe at this, for example, can be considered to the sequencing list of the executable instruction for realizing logical function, may be embodied in any computer-readable medium, use for instruction execution system, device or equipment (as computer based system, comprise that the system of processor or other can and carry out the system of instruction from instruction execution system, device or equipment instruction fetch), or use in conjunction with these instruction execution systems, device or equipment.With regard to this specification, " computer-readable medium " can be anyly can comprise, device that storage, communication, propagation or transmission procedure use for instruction execution system, device or equipment or in conjunction with these instruction execution systems, device or equipment.The example more specifically (non-exhaustive list) of computer-readable medium comprises following: the electrical connection section (electronic equipment) with one or more wirings, portable computer diskette box (magnetic device), random-access memory (ram), ROM (read-only memory) (ROM), the erasable ROM (read-only memory) (EPROM or flash memory) of editing, fiber device, and portable optic disk ROM (read-only memory) (CDROM).In addition, computer-readable medium can be even paper or other the suitable medium that can print described program thereon, because can be for example by paper or other media be carried out to optical scanner, then edit, decipher or process in electronics mode and obtain described program with other suitable methods if desired, be then stored in computer storage.
Should be appreciated that each several part of the present invention can realize with hardware, software, firmware or their combination.In the above-described embodiment, multiple steps or method can realize with being stored in software or the firmware carried out in storage and by suitable instruction execution system.For example, if realized with hardware, the same in another embodiment, can realize by any one in following technology well known in the art or their combination: there is the discrete logic for data-signal being realized to the logic gates of logical function, there is the specific integrated circuit of suitable combinational logic gate circuit, programmable gate array (PGA), field programmable gate array (FPGA) etc.
Those skilled in the art are appreciated that realizing all or part of step that above-described embodiment method carries is can carry out the hardware that instruction is relevant by program to complete, described program can be stored in a kind of computer-readable recording medium, this program, in the time carrying out, comprises step of embodiment of the method one or a combination set of.
In addition, the each functional unit in each embodiment of the present invention can be integrated in a puocessing module, can be also that the independent physics of unit exists, and also can be integrated in a module two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, and also can adopt the form of software function module to realize.If described integrated module realizes and during as production marketing independently or use, also can be stored in a computer read/write memory medium using the form of software function module.
The above-mentioned storage medium of mentioning can be ROM (read-only memory), disk or CD etc.
In the description of this specification, the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or example in conjunction with specific features, structure, material or the feature of this embodiment or example description.In this manual, the schematic statement of above-mentioned term is not necessarily referred to identical embodiment or example.And specific features, structure, material or the feature of description can be with suitable mode combination in any one or more embodiments or example.
Although illustrated and described embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, those of ordinary skill in the art can change above-described embodiment within the scope of the invention in the situation that not departing from principle of the present invention and aim, amendment, replacement and modification.
Claims (10)
1. a low-pressure cavity compressor system, is characterized in that, comprising:
Low-pressure cavity compressor;
Oil temperature heating equipment, described oil temperature heating equipment is arranged at the bottom of described low-pressure cavity compressor;
The first temperature transducer, described the first temperature transducer is arranged on the muffler place of described low-pressure cavity compressor, for detect the suction temperature of the muffler of described low-pressure cavity compressor every predetermined period;
The second temperature transducer, described the second temperature transducer is arranged on the bottom or described oil temperature heating equipment of described low-pressure cavity compressor, for detect the oil temperature temperature of described low-pressure cavity compressor every described predetermined period; And
Control module, described control module is electrically connected with described the first temperature transducer, the second temperature transducer and described oil temperature heating equipment, for every described predetermined period according to the degree of superheat of low-pressure cavity compressor described in described suction temperature and described oil temperature temperature computation, and according to described in the described degree of superheat control oil temperature heating equipment open or close.
2. low-pressure cavity compressor system as claimed in claim 1, is characterized in that, described oil temperature heating equipment is oil temperature heating tape.
3. low-pressure cavity compressor system as claimed in claim 1, is characterized in that, described control module comprises:
Computing unit, for according to the degree of superheat of low-pressure cavity compressor described in described suction temperature and described oil temperature temperature computation; And
Control unit, described control unit is connected with described computing unit electricity, for opening or close according to oil temperature heating equipment described in described degree of superheat control.
4. the low-pressure cavity compressor system as described in claim 1 or 3, is characterized in that, described computing unit calculates the degree of superheat and is: the described degree of superheat=described oil temperature temperature-described suction temperature.
5. the low-pressure cavity compressor system as described in claim 1 or 3, is characterized in that, described control unit is used for judging whether the described degree of superheat is less than or equal to default unlatching value, if so, controls described oil temperature heating equipment and opens;
Described control unit is also for judging that whether the described degree of superheat is greater than default unlatching value, if so, controls described oil temperature heating equipment and closes.
6. an outdoor unit, is characterized in that, comprising:
Low-pressure cavity compressor system described in claim 1-5 any one;
Four-way valve, the exhaust end of described four-way valve is connected with the outlet pipe of the low-pressure cavity compressor of described low-pressure cavity compressor system;
Heat exchanger, one end of described heat exchanger is connected with the condenser end of described four-way valve;
Throttle part, one end of described throttle part is connected with the other end of described heat exchanger;
The first stop valve, described the first stop valve is connected with the other end of described throttle part;
The second stop valve, described the second stop valve is connected with the evaporator end of described four-way valve; And
Gas-liquid separator, described gas-liquid separator is connected with the muffler of the air-breathing pipe end of described four-way valve and the low-pressure cavity compressor of described low-pressure cavity compressor system.
7. the control method for overheat to the low-pressure cavity compressor system described in claim 1-5 any one, is characterized in that, every predetermined period, carries out following steps:
Detect the suction temperature of muffler and the oil temperature temperature of described low-pressure cavity compressor of described low-pressure cavity compressor;
According to the degree of superheat of low-pressure cavity compressor described in described suction temperature and described oil temperature temperature computation; And
Open or close according to oil temperature heating equipment described in described degree of superheat control.
8. the control method for overheat of low-pressure cavity compressor system as claimed in claim 7, is characterized in that, described oil temperature heating equipment is positioned at the bottom of described low-pressure cavity compressor.
9. the control method for overheat of low-pressure cavity compressor system as claimed in claim 7, is characterized in that, the computational methods of the described degree of superheat are: the described degree of superheat=described oil temperature temperature-described suction temperature.
10. the control method for overheat of low-pressure cavity compressor system as claimed in claim 7, is characterized in that, describedly opens or closes according to oil temperature heating equipment described in described degree of superheat control, comprises the steps:
Judge that whether the described degree of superheat is less than or equal to default unlatching value, if so, opens described oil temperature heating equipment;
Judge whether the described degree of superheat is greater than or default unlatching value, if so, close described oil temperature heating equipment.
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| CN106288570A (en) * | 2016-08-19 | 2017-01-04 | 芜湖美智空调设备有限公司 | The method for heating and controlling of compressor oil sump and compressor, air conditioning system |
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| CN106895557A (en) * | 2017-02-21 | 2017-06-27 | 广东美的暖通设备有限公司 | Air-conditioning system and its expansion valve control method and control device |
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| CN110762914A (en) * | 2019-10-25 | 2020-02-07 | 青岛海尔空调电子有限公司 | Method for controlling heating belt of compressor |
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| WO2022116611A1 (en) * | 2020-12-04 | 2022-06-09 | 广东美的暖通设备有限公司 | Compressor return air dryness measurement method, apparatus, device, and storage medium |
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Application publication date: 20141022 |