CN111365897A - Motor cooling loop of compressor, cooling method, refrigerating system and air conditioner - Google Patents
Motor cooling loop of compressor, cooling method, refrigerating system and air conditioner Download PDFInfo
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- CN111365897A CN111365897A CN201811599031.8A CN201811599031A CN111365897A CN 111365897 A CN111365897 A CN 111365897A CN 201811599031 A CN201811599031 A CN 201811599031A CN 111365897 A CN111365897 A CN 111365897A
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- 238000001816 cooling Methods 0.000 title claims abstract description 213
- 239000003507 refrigerant Substances 0.000 claims abstract description 125
- 238000005057 refrigeration Methods 0.000 claims abstract description 53
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 239000002826 coolant Substances 0.000 abstract description 5
- 239000000110 cooling liquid Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000007774 longterm Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000006200 vaporizer Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
- F25B31/006—Cooling of compressor or motor
- F25B31/008—Cooling of compressor or motor by injecting a liquid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
The invention relates to a motor cooling loop of a compressor, a cooling method, a refrigerating system and an air conditioner. Wherein, the motor cooling circuit of compressor includes: a motor of the compressor; a refrigeration cycle pipeline where the compressor is located; a cooling pipeline communicated with the refrigeration cycle pipeline and the motor and used for guiding part of refrigerant in the refrigeration cycle pipeline to the motor so as to cool the motor; and the pressurizing piece is arranged on the cooling pipeline and used for adjusting the pressure of the refrigerant in the cooling pipeline. The invention can adjust the flow of the cooling medium for cooling the motor by realizing the variable pressure of the cooling medium for cooling the motor so as to adapt to the required quantity of the cooling medium under different working conditions.
Description
Technical Field
The invention relates to the field of compressors, in particular to a motor cooling loop of a compressor with adjustable refrigerant quantity, a cooling method, a refrigerating system and an air conditioner.
Background
The motor of the centrifugal compressor is a special motor with high power and high rotating speed, the rated power of the motor is increased along with the increase of a cold quantity section, and the power of the motor of the centrifugal machine used for refrigeration in the industry at present is up to 1300 kW. However, because the motor has copper loss and iron loss, the motor efficiency cannot reach 100%, the lost motor efficiency is converted into heat, and the larger the motor power is, the larger the heat productivity is. The overflowing heat can reduce the output power of the motor, and can cause the rotor to demagnetize when the output power is serious, or even burn the motor. Therefore, motor cooling is a necessary means for ensuring stable operation of the centrifuge.
The related art currently has the following problems in cooling the motor of the compressor:
1) before the centrifugal machine is started, the pressure of each part of the system is in a balanced state, so after the centrifugal machine is started, the refrigerant required by the cooling motor cannot be directly obtained from refrigerant containers such as a condenser, an evaporator or a flash evaporator and the like before the pressure difference is not established;
2) when working conditions such as low pressure difference are switched, the motor cooling liquid fluctuation caused by the reduction of the system pressure difference can cause the shortage of the motor cooling liquid;
3) when working conditions such as high pressure difference are switched, in order to improve the pressure ratio, the load of the compressor is increased, the power of the motor is increased at the moment, the heat productivity is also increased, and the required cooling liquid is also increased.
Disclosure of Invention
One of the purposes of the invention is to provide a motor cooling loop of a compressor with adjustable refrigerant quantity, a cooling method, a refrigeration system and an air conditioner, which are used for relieving the problem that the pressure difference of the motor cooling loop cannot be ensured.
Some embodiments of the present invention provide a motor cooling circuit of a compressor, including: a motor of the compressor; a refrigeration cycle pipeline where the compressor is located; a cooling pipeline communicated with the refrigeration cycle pipeline and the motor and used for guiding part of refrigerant in the refrigeration cycle pipeline to the motor so as to cool the motor; and the pressurizing piece is arranged on the cooling pipeline and used for adjusting the pressure of the refrigerant in the cooling pipeline.
In some embodiments, the cooling circuit comprises a first cooling circuit and a second cooling circuit connected in parallel; the refrigerant in the first cooling pipeline and the second cooling pipeline is sourced from the refrigeration cycle pipeline; the first cooling pipeline and the second cooling pipeline can be switched to select one cooling pipeline to provide a refrigerant for the motor; the pressurizing piece is arranged on one of the first cooling pipeline and the second cooling pipeline and used for adjusting the pressure of a refrigerant in the pipeline where the pressurizing piece is located.
In some embodiments, the cooling circuit comprises: a refrigerant leading-out pipeline, the first end of which is communicated with the refrigeration cycle pipeline; a second end is in communication with the first cooling line and the second cooling line.
In some embodiments, the motor cooling circuit of the compressor comprises: the first end of the three-way regulating valve is connected with the refrigerant leading-out pipeline; the second end is connected with the first cooling pipeline; the third end is connected with the second cooling pipeline.
In some embodiments, the cooling circuit comprises: a converging line having a first end communicating with the first cooling line and the second cooling line; the second end is communicated with the motor and is used for providing a refrigerant for the motor.
In some embodiments, the motor cooling circuit of the compressor includes a check valve disposed on the merging line for flowing the refrigerant to the motor.
In some embodiments, the motor cooling circuit of the compressor comprises: a refrigerant return pipeline, the first end of which is communicated with the motor; the second end is communicated with the refrigeration cycle pipeline; the refrigerant return pipeline is used for leading the refrigerant which releases heat in the motor and cools the motor back to the refrigeration cycle pipeline.
In some embodiments, the refrigeration cycle line comprises a condenser; the cooling pipeline is communicated with the output end of the condenser.
In some embodiments, the refrigeration cycle line comprises an evaporator or a flash tank; the motor cooling circuit further includes: a refrigerant return pipeline, the first end of which is communicated with the motor; the second end is communicated with the input end of the evaporator or the flash tank.
In some embodiments, a motor cooling circuit of a compressor includes a first pressure detecting element for detecting a pressure P1 of a refrigerant before flowing into the motor, and a second pressure detecting element for detecting a pressure P2 of the refrigerant after flowing out of the motor, wherein the pressure increasing element is used for adjusting the pressure of the refrigerant in the cooling pipeline to enable △ P not to be lower than a preset value, and △ P is P1-P2.
In some embodiments, an electrically operated valve is disposed on the cooling line.
In some embodiments, a filter is disposed on the cooling line.
In some embodiments, the plenum comprises a variable frequency booster pump.
The motor cooling method comprises the steps of switching to a pipeline provided with a pressurizing piece when a refrigeration circulation pipeline is just started or is in an unstable operation state, adjusting the pressure of a refrigerant in the pipeline by the pressurizing piece to enable the pressure difference △ P between the pressure P1 of the refrigerant before flowing into the motor and the pressure P2 of the refrigerant after flowing out of the motor to meet a preset value, wherein △ P is P1-P2, and switching to the pipeline without the pressurizing piece when the pressure difference △ P meets the preset value.
In some embodiments, the state where the refrigeration cycle line is in the unstable operation state includes a state where the amount of cooling required by the user side is increased or a state where the amount of cooling required by the user side is decreased.
In some embodiments, in a state where the required cooling capacity at the user end is increased: the pressure of the refrigerant in the pipeline where the pressure increasing part is located is increased through the pressure increasing part; or, the refrigerant pressure in the pipeline where the refrigerant is located is reduced through the pressurizing piece in the state that the refrigerating capacity needed by the user side is reduced.
Some embodiments of the present invention provide a refrigeration system comprising the motor cooling circuit of the above embodiments.
Some embodiments of the present invention provide an air conditioner including the refrigeration system of the above embodiments.
Based on the technical scheme, the invention at least has the following beneficial effects:
in some embodiments, the motor cooling circuit of the compressor comprises a cooling pipeline and a pressurizing part, wherein the cooling pipeline is communicated with the refrigeration circulation pipeline and the motor and is used for guiding part of refrigerant in the refrigeration circulation pipeline to the motor so as to cool the motor; the pressurizing piece is arranged on the cooling pipeline and used for adjusting the pressure of a refrigerant in the cooling pipeline, so that the pressure of the refrigerant for cooling the motor is variable, and the flow of the refrigerant for cooling the motor is adjusted to adapt to the amount of the refrigerant required under different working conditions.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a schematic view of a motor cooling circuit of a compressor according to some embodiments of the present invention.
Reference numerals in the drawings indicate:
1-a compressor; 2, a motor; 3-a first cooling circuit; 4-a second cooling circuit; 5-a pressure increasing piece; 6-refrigerant leading-out pipeline; 7-a three-way regulating valve; 8-a converging pipeline; 9-a one-way valve; 10-refrigerant return line; 11-a condenser; 12-an evaporator or flash tank; 13-a first pressure-detecting element; 14-a second pressure-sensing element; 15-electric valve; 16-filter.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the present invention.
As shown in fig. 1, a schematic diagram of a motor cooling circuit of a compressor is provided in some embodiments.
In some embodiments, the motor cooling circuit of the compressor comprises a refrigeration cycle circuit in which the compressor 1 is located. Part of the refrigerant in the refrigeration cycle line is used for cooling the motor 2.
In some embodiments, the refrigeration cycle circuit includes a compressor 1, a condenser 11, and an evaporator or flash tank 12.
Further, the compressor 1 comprises a centrifugal compressor 1.
In some embodiments, the motor cooling circuit of the compressor comprises the motor 2 of the compressor 1.
In some embodiments, the motor cooling circuit of the compressor includes a cooling pipeline, and the cooling pipeline is communicated with the refrigeration cycle pipeline and the motor 2 and is used for guiding a part of refrigerant in the refrigeration cycle pipeline to the motor 2 so as to cool the motor 2.
In some embodiments, the motor cooling circuit of the compressor includes a pressurizing member 5, and the pressurizing member 5 is disposed in the cooling pipeline and is configured to adjust a pressure of a refrigerant in the cooling pipeline, so as to vary a pressure of the refrigerant for cooling the motor 2, and further adjust a flow rate of the refrigerant for cooling the motor 2, so as to adapt to amounts of the refrigerant required under different working conditions.
In some embodiments, the cooling circuit comprises a first cooling circuit 3 and a second cooling circuit 4 in parallel. The refrigerant in the first cooling pipeline 3 and the second cooling pipeline 4 is derived from a refrigeration cycle pipeline.
Since the pressure difference is a guarantee for driving the refrigerant to flow in the circulation line, and an excessively small pressure difference reduces the amount of the refrigerant for cooling the motor 2, which easily causes overheating of the motor 2. Thus, in some embodiments, the motor cooling circuit of the compressor comprises a plenum 5, the plenum 5 being provided in one of the first cooling circuit 3 and the second cooling circuit 4.
The pressurizing piece 5 is used for adjusting the pressure of a refrigerant in a pipeline where the pressurizing piece is located, so that the pressure of the refrigerant for cooling the motor 2 is variable, and further, the flow of the refrigerant for cooling the motor 2 is adjusted to adapt to the amount of the refrigerant required under different working conditions.
Optionally, the pressure increasing member 5 is disposed on the second cooling pipeline 4, and the pressure increasing member 5 is used for adjusting the pressure of the refrigerant in the second cooling pipeline 4.
In some embodiments, the first cooling circuit 3 and the second cooling circuit 4 are switchable to alternatively provide the refrigerant to the motor 2. The pipeline for providing the refrigerant for the motor 2 is variable, the adjustability of the cooling liquid of the motor 2 can be realized, and the energy conservation of long-term operation of the system is facilitated.
In some embodiments, the cooling circuit includes a first cooling circuit 3 and a second cooling circuit 4 connected in parallel, and the first cooling circuit 3 and the second cooling circuit 4 are switchable to alternatively provide a cooling medium to the motor 2; the pressurizing piece 5 is arranged on one of the first cooling pipeline 3 and the second cooling pipeline 4, the pressurizing piece 5 is used for adjusting the pressure of a refrigerant in a pipeline where the pressurizing piece is located, the pressure of the refrigerant for cooling the motor 2 is variable, the flow of the refrigerant for cooling the motor 2 is adjusted, and therefore the required refrigerant amount is adapted to different working conditions, and the problem that the differential pressure of a cooling loop of the motor cannot be guaranteed is solved.
In some embodiments, the cooling line includes a coolant outlet line 6. The first end of the refrigerant leading-out pipeline 6 is communicated with a refrigeration cycle pipeline; the second end of the refrigerant leading-out pipeline 6 is communicated with the first cooling pipeline 3 and the second cooling pipeline 4.
In some embodiments, the motor cooling circuit of the compressor comprises a three-way regulating valve 7. The first end of the three-way regulating valve 7 is connected with the refrigerant leading-out pipeline 6; the second end of the three-way regulating valve 7 is connected with the first cooling pipeline 3; the third end of the three-way regulating valve 7 is connected with the second cooling pipeline 4.
The switching between the first cooling pipeline 3 and the second cooling pipeline 4 is realized by arranging the three-way regulating valve 7.
Optionally, after the system pressure difference is stabilized, the pipeline without the pressurizing part 5 is switched to reduce the operation of the pressurizing part 5 in long-term operation, which is beneficial to saving energy and reducing faults.
Of course, it is also possible to provide no three-way regulating valve 7, and to provide switching valves on the first cooling line 3 and the second cooling line 4, respectively, to switch the first cooling line 3 and the second cooling line 4.
In some embodiments, the cooling circuit includes a merged circuit 8, a first end of the merged circuit 8 communicating with the first cooling circuit 3 and the second cooling circuit 4; and the second end of the confluence pipeline 8 is communicated with the motor 2 and is used for providing a refrigerant for the motor 2.
In some embodiments, the motor cooling circuit of the compressor comprises a check valve 9, and the check valve 9 is disposed on the converging line 8 and is used for flowing the refrigerant to the motor 2.
The check valve 9 mainly functions as a one-way constant flow function for preventing a refrigerant for cooling the motor 2 from flowing backward to cause a shortage of the cooling liquid in the motor 2 and causing an impact on components (e.g., the motor valve 15, the filter 16, the pressurizing member 5, etc.) provided on the first cooling line 3 and the second cooling line 4.
In some embodiments, the motor cooling circuit of the compressor comprises a refrigerant return line 10. A first end of the refrigerant return pipeline 10 is communicated with the motor 2; the second end of the refrigerant return line 10 is communicated with the refrigeration cycle line.
The refrigerant return line 10 is used to return the refrigerant, which has released heat from the motor 2 and cooled the motor 2, to the refrigeration cycle line.
In some embodiments, the refrigeration cycle line includes a condenser 11. The cooling line communicates with the output of the condenser 11.
In some embodiments, the first cooling circuit 3 and the second cooling circuit 4 are in communication with the output of the condenser 11.
Because the pressure of the refrigerant at the output end of the condenser 11 is high, the refrigerant is led out from the output end of the condenser 11, and the flowing of the refrigerant in the motor cooling loop is favorably realized. Of course, the refrigerant is not limited to being drawn from the output end of the condenser 11.
In some embodiments, the refrigeration cycle circuit includes an evaporator or flash tank 12. A first end of the refrigerant return pipeline 10 is communicated with the motor 2; the second end of the refrigerant return line 10 is communicated with the input end of an evaporator or flash tank 12.
In some embodiments, to ensure that the amount of cooling liquid (refrigerant) provided to the motor 2 is sufficient, the refrigerant for cooling the motor 2 is taken from the condenser 11 with the highest pressure, and the refrigerant after cooling the motor 2 is returned to the evaporator or flash tank 12, so that the motor cooling circuit has a certain pressure difference, and self-circulation is achieved.
In some embodiments, the motor cooling circuit of the compressor includes a first pressure detecting element 13, and the first pressure detecting element 13 is used for detecting the pressure P1 of the refrigerant before flowing into the motor 2.
Alternatively, the first pressure detecting element 13 is provided in the merged pipe line 8.
In some embodiments, the motor cooling circuit of the compressor includes a second pressure detecting element 14, and the second pressure detecting element 14 is used for detecting the pressure P2 of the refrigerant flowing out of the motor 2.
Optionally, a second pressure sensing element 14 is provided at the input of the vaporizer or flash tank 12.
In some embodiments, the pressurizing unit 5 is configured to adjust the pressure of the refrigerant in the pipeline, so that △ P is not lower than a preset value, wherein △ P is P2-P1.
Alternatively, △ P is not less than 100kPa to ensure cooling effect.
In some embodiments, an electric valve 15 is provided on the cooling line.
In some embodiments, the first cooling line 3 is provided with an electric valve 15 or a throttle valve.
In some embodiments, since the refrigerant output from the output end of the condenser 11 is in a high-temperature and high-pressure state, which cannot achieve the effect of cooling the motor, the refrigerant for cooling the motor 2 first passes through the electric valve 15, and the diameter of the via hole is adjusted by the electric valve 15, so as to achieve the purpose of throttling, obtain a low-pressure and low-temperature refrigerant, and further cool the motor 2 of the compressor 1. The refrigerant after cooling the motor 2 returns to the evaporator or the flash tank 12 and is finally collected in the compressor 1, and the refrigerant increases the pressure through the compressor 1 and then flows to the condenser 11 again, thereby completing the refrigerant circulation for cooling the motor 2.
In some embodiments, an electric valve 15 or a throttle is provided on the second cooling line 4.
In some embodiments, a filter 16 is provided on the cooling circuit.
In some embodiments, a filter 16 is provided on the first cooling line 3.
In some embodiments, a filter 16 is provided on the second cooling line 4.
Alternatively, the filter 16 is made of a high strength wire mesh that is resistant to refrigerant erosion and high pressure shock. In order to ensure the filtering effect, the filtering precision is preferably not lower than 3 um.
In some embodiments, the plenum 5 comprises a variable frequency booster pump.
In some embodiments, the variable frequency booster pump is mainly used to boost the pressure of the refrigerant used to cool the motor 2 to be higher than the pressure at the input end of the evaporator or flash evaporator 12, thereby achieving circulation of the motor cooling loop.
Furthermore, the variable frequency booster pump can also realize variable frequency speed regulation, thereby obtaining refrigerants with different pressures for cooling the motor 2 and adapting to different working condition requirements.
The variable frequency speed regulation of the variable frequency booster pump is jointly controlled by the first pressure detection element 13 and the second pressure detection element 14.
Some embodiments provide a motor cooling method of a compressor, which is implemented by using the motor cooling circuit.
In some embodiments, a method of cooling an electric machine includes:
when the refrigeration circulation pipeline is in a just starting state:
switching to a pipeline provided with a pressurizing piece 5;
the pressure of the refrigerant in the pipeline where the booster 5 is located is adjusted through the booster 5, so that the pressure difference △ P between the pressure P1 of the refrigerant before flowing into the motor 2 and the pressure P2 of the refrigerant after flowing out of the motor 2 meets a preset value, wherein △ P is P1-P2.
The embodiment is used for solving the problems that the refrigerant for cooling the motor 2 cannot be obtained due to the fact that the pressure difference of the motor cooling loop is not established when the motor is started, and the pressure ratio is difficult to increase due to the refrigerant with larger specific volume, so that the cooling of the motor 2 is influenced.
In some embodiments, a method of cooling an electric machine includes:
in a state where the refrigeration cycle line is in unstable operation:
switching to a pipeline provided with a pressurizing piece 5;
the pressure of the refrigerant in the pipeline where the booster 5 is located is adjusted through the booster 5, so that the pressure difference △ P between the pressure P1 of the refrigerant before flowing into the motor 2 and the pressure P2 of the refrigerant after flowing out of the motor 2 meets a preset value, wherein △ P is P1-P2.
The embodiment is used for solving the problem of the fluctuation of the cooling liquid of the motor 2 caused by the fluctuation of the pressure difference in the operation process of the refrigeration cycle pipeline.
In some embodiments, a method of cooling an electric machine includes:
when the refrigeration cycle pipeline is in a stable operation state, that is, a pressure difference △ P between a refrigerant pressure P1 before flowing into the motor 2 and a refrigerant pressure P2 after flowing out of the motor 2 meets a preset value:
switching to the circuit without the plenum 5.
In some embodiments, the second cooling line 4 is provided with a plenum 5.
Before starting or when the system working condition changes, the pressure difference △ P does not meet the preset value, the three-way regulating valve 7 is switched to the second cooling pipeline 4, at the moment, the first cooling pipeline 3 is closed, the variable-frequency booster pump does work, and the pressure difference △ P is increased.
And after the system operates stably, the pressure at the output end of the condenser 11 is greater than the pressure at the input end of the evaporator or the flash evaporator 12, and is adjusted by combining the electric valve 15 to form an effective pressure difference △ P, at the moment, the pressure is switched to the first cooling pipeline 3 through the three-way adjusting valve 7, at the moment, the second cooling pipeline 4 is closed, so that the operation of the variable-frequency booster pump during long-term operation is reduced, and the energy conservation is realized.
In some embodiments, the state where the refrigeration cycle line is in the unstable operation state includes a state where the amount of cooling required by the user side is increased or a state where the amount of cooling required by the user side is decreased.
In some embodiments, in a state where the required cooling capacity at the user end is increased: the pressure of the refrigerant in the pipeline is increased by the pressurizing piece 5.
When the amount of refrigeration required by the user side increases, the power of the motor 2 increases, the heat productivity of the motor 2 also increases, and at this time, the flow rate of the refrigerant for cooling the motor 2 can be increased by improving the capacity of the pressurizing member 5, so that more refrigerants can be provided to cool the motor 2.
In some embodiments, the refrigerant pressure in the pipeline where the booster 5 is located is reduced by the booster 5 in the state that the required cooling capacity of the user end is reduced.
When the required refrigeration capacity of user descends, the power of motor 2 reduces, and the calorific capacity of motor 2 also reduces, and if the refrigerant that is used for cooling motor 2 was too much this moment, can make motor 2 temperature hang down excessively, causes the condensation phenomenon, consequently, the accessible reduces the ability of supercharging piece 5, reduces the flow of the refrigerant that is used for cooling motor 2 to reduce cooling effect.
Some embodiments provide a refrigeration system comprising the motor cooling circuit of the above embodiments.
Some embodiments provide an air conditioner including the refrigeration system of the above embodiments.
In the description of the present invention, it should be understood that the terms "first", "second", "third", etc. are used to define the components, and are used only for the convenience of distinguishing the components, and if not otherwise stated, the terms have no special meaning, and thus, should not be construed as limiting the scope of the present invention.
Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (18)
1. A motor cooling circuit of a compressor, comprising:
a motor (2) of the compressor (1);
a refrigeration cycle pipeline where the compressor (1) is located;
the cooling pipeline is communicated with the refrigeration circulation pipeline and the motor (2) and is used for guiding part of refrigerant in the refrigeration circulation pipeline to the motor (2) so as to cool the motor (2); and
and the pressurizing piece (5) is arranged on the cooling pipeline and is used for adjusting the pressure of a refrigerant in the cooling pipeline.
2. -motor-cooling circuit of a compressor, according to claim 1, characterized in that said cooling circuit comprises a first cooling circuit (3) and a second cooling circuit (4) connected in parallel; the refrigerants in the first cooling pipeline (3) and the second cooling pipeline (4) are sourced from the refrigeration cycle pipeline; the first cooling pipeline (3) and the second cooling pipeline (4) can be switched to select one to provide a refrigerant for the motor (2); the pressurizing piece (5) is arranged on one of the first cooling pipeline (3) and the second cooling pipeline (4), and the pressurizing piece (5) is used for adjusting the pressure of a refrigerant in the pipeline where the pressurizing piece is located.
3. The motor cooling circuit of a compressor according to claim 2, wherein the cooling line comprises:
a refrigerant leading-out pipeline (6), the first end of which is communicated with the refrigeration cycle pipeline; the second end is communicated with the first cooling pipeline (3) and the second cooling pipeline (4).
4. The motor cooling circuit of a compressor as set forth in claim 3, comprising:
a three-way regulating valve (7), the first end of which is connected with the refrigerant leading-out pipeline (6); the second end is connected with the first cooling pipeline (3); the third end is connected with the second cooling pipeline (4).
5. The motor cooling circuit of a compressor according to claim 2, wherein the cooling line comprises:
a merging line (8) having a first end communicating with the first cooling line (3) and the second cooling line (4); the second end is communicated with the motor (2) and is used for providing a refrigerant for the motor (2).
6. The motor cooling circuit of compressor according to claim 5, comprising a check valve (9) provided in the merging line (8) for allowing the refrigerant to flow toward the motor (2).
7. The motor cooling circuit of a compressor as set forth in claim 1, comprising:
a refrigerant return pipeline (10), the first end of which is communicated with the motor (2); the second end is communicated with the refrigeration cycle pipeline; the refrigerant return pipeline (10) is used for leading the refrigerant which releases heat in the motor (2) and cools the motor (2) back to the refrigeration cycle pipeline.
8. The motor cooling circuit of a compressor according to claim 1, characterized in that said refrigeration cycle circuit comprises a condenser (11);
the cooling pipeline is communicated with the output end of the condenser (11).
9. The motor cooling circuit of a compressor according to claim 1 or 8, characterized in that said refrigeration cycle circuit comprises an evaporator or a flash-tank (12);
the motor cooling circuit further includes:
a refrigerant return pipeline (10), the first end of which is communicated with the motor (2); the second end is in communication with the input of the evaporator or flash tank (12).
10. The motor cooling circuit of a compressor as set forth in claim 1, comprising:
a first pressure detection element (13) for detecting a pressure P1 of the refrigerant before flowing into the motor (2); and
a second pressure detection element (14) for detecting a refrigerant pressure P2 after flowing out of the motor (2);
the pressurizing piece (5) is used for adjusting the pressure of a refrigerant in the cooling pipeline so that △ P is not lower than a preset value, wherein △ P is P1-P2.
11. The motor cooling circuit of compressor according to claim 1, characterized in that said cooling circuit is provided with an electric valve (15).
12. The motor-cooling circuit of a compressor according to claim 1, characterized in that said cooling line is provided with a filter (16).
13. Motor cooling circuit of a compressor according to claim 1, characterized in that said booster (5) comprises a variable frequency booster pump.
14. A motor cooling method of a compressor, characterized in that the motor cooling circuit of claim 2 is used, the motor cooling method comprising:
in a state where the refrigeration cycle pipe is just started or is in unstable operation:
switching to a pipeline provided with a pressurizing piece (5);
the refrigerant pressure in the pipeline where the pressure increasing piece (5) is located is adjusted through the pressure increasing piece (5), so that the pressure difference △ P between the refrigerant pressure P1 before flowing into the motor (2) and the refrigerant pressure P2 after flowing out of the motor (2) meets a preset value;
wherein △ P is P1-P2;
in a state where the pressure difference △ P satisfies a preset value:
switching to the pipeline without the booster (5).
15. The motor cooling method of a compressor according to claim 14, wherein the state where the refrigerant cycle circuit is in the unstable operation includes a state where a cooling capacity required by the user side is increased or a state where a cooling capacity required by the user side is decreased.
16. The motor cooling method of a compressor according to claim 15,
under the state that the required refrigeration capacity of the user side is improved: the pressure of the refrigerant in the pipeline where the pressure increasing piece (5) is arranged is increased; or,
and under the condition that the refrigerating capacity required by the user side is reduced, the refrigerant pressure in the pipeline where the user side is located is reduced through the pressurizing piece (5).
17. A refrigeration system comprising an electric machine cooling circuit as claimed in any one of claims 1 to 13.
18. An air conditioner comprising a refrigeration system as recited in claim 17.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811599031.8A CN111365897A (en) | 2018-12-26 | 2018-12-26 | Motor cooling loop of compressor, cooling method, refrigerating system and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811599031.8A CN111365897A (en) | 2018-12-26 | 2018-12-26 | Motor cooling loop of compressor, cooling method, refrigerating system and air conditioner |
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| Publication Number | Publication Date |
|---|---|
| CN111365897A true CN111365897A (en) | 2020-07-03 |
Family
ID=71208961
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811599031.8A Withdrawn CN111365897A (en) | 2018-12-26 | 2018-12-26 | Motor cooling loop of compressor, cooling method, refrigerating system and air conditioner |
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| Country | Link |
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| CN (1) | CN111365897A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112803670A (en) * | 2021-01-04 | 2021-05-14 | 珠海格力电器股份有限公司 | Magnetic suspension centrifugal compressor cooling method and device |
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| AU2010246499A1 (en) * | 2009-12-01 | 2011-06-16 | Shell Internationale Research Maatschappij B.V. | Method and system for cooling a hydrocarbon stream |
| CN103782117A (en) * | 2011-09-16 | 2014-05-07 | 丹佛斯特波科尔压缩机有限公司 | Motor cooling and sub-cooling circuits for compressor |
| JP2015169352A (en) * | 2014-03-05 | 2015-09-28 | 荏原冷熱システム株式会社 | turbo refrigerator |
| CN205561324U (en) * | 2016-01-28 | 2016-09-07 | 苏州必信空调有限公司 | Refrigerating system |
| CN209246462U (en) * | 2018-12-26 | 2019-08-13 | 珠海格力电器股份有限公司 | Motor cooling loop of compressor, refrigerating system and air conditioner |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2928256A (en) * | 1957-11-25 | 1960-03-15 | Gen Electric | Refrigerating system including auxiliary hot gas defrosting circuit |
| AU2010246499A1 (en) * | 2009-12-01 | 2011-06-16 | Shell Internationale Research Maatschappij B.V. | Method and system for cooling a hydrocarbon stream |
| CN103782117A (en) * | 2011-09-16 | 2014-05-07 | 丹佛斯特波科尔压缩机有限公司 | Motor cooling and sub-cooling circuits for compressor |
| JP2015169352A (en) * | 2014-03-05 | 2015-09-28 | 荏原冷熱システム株式会社 | turbo refrigerator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112803670A (en) * | 2021-01-04 | 2021-05-14 | 珠海格力电器股份有限公司 | Magnetic suspension centrifugal compressor cooling method and device |
| CN112803670B (en) * | 2021-01-04 | 2022-04-15 | 珠海格力电器股份有限公司 | Magnetic suspension centrifugal compressor cooling method and device |
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