CN110360777A - A kind of control method of coolant circulating system - Google Patents
A kind of control method of coolant circulating system Download PDFInfo
- Publication number
- CN110360777A CN110360777A CN201810312720.XA CN201810312720A CN110360777A CN 110360777 A CN110360777 A CN 110360777A CN 201810312720 A CN201810312720 A CN 201810312720A CN 110360777 A CN110360777 A CN 110360777A
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- compressor
- operational mode
- circulating system
- coolant circulating
- control method
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Classifications
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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
- F25B31/002—Lubrication
- F25B31/004—Lubrication oil recirculating arrangements
-
- 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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
Abstract
The invention discloses a kind of control methods of coolant circulating system.The control method includes: that the operating parameter of the coolant circulating system is adjusted according to the degree of superheat of the coolant circulating system and/or degree of supercooling in first operational mode, to reduce oil drain quantity of the compressor during first operational mode.In the control method of coolant circulating system provided by the present application, coolant circulating system has the first operational mode without compressor oil return, in this operating mode, it can be according to the degree of superheat of indoor heat exchanger and/or degree of supercooling to the compressor frequency of coolant circulating system, outdoor fan frequency, the operating parameters such as throttling set aperture are adjusted, to reduce the oil drain quantity of compressor, to increase indoor band oil, guarantee the reliability service oil mass of the compressor during the operational mode, when user needs to keep quite environment, operation module can be switched to the first operational mode, to guarantee the usage comfort of user.
Description
Technical field
The present invention relates to refrigerant circulation technical field, especially a kind of control method of coolant circulating system.
Background technique
The compressor oil return control of for example multi-joint machine equipment of air-conditioning equipment currently on the market is most of using timing
The control of oil return carries out an oil return at interval of regular hour control compressor, oil return process may occur at night
User rest during or users conference during etc. need to keep quite environment when, unit can shut down when carrying out oil return
Interior machine in generate liquid stream sound, and in being reduced in interior mechanism heat machine leaving air temp, to influence the use of user comfortably
Degree.
Summary of the invention
In view of this, one of the objects of the present invention is to provide one kind to improve while guarantee system is reliable for operation
The control method of the coolant circulating system of user's usage comfort.
In order to achieve the above objectives, on the one hand, the present invention adopts the following technical scheme:
A kind of control method of coolant circulating system, the coolant circulating system have first without compressor oil return
Operational mode and the second operational mode for carrying out Conventional press oil return, the control method include:
In first operational mode, according to the interior machine degree of superheat and/or interior machine degree of supercooling pair of the coolant circulating system
The operating parameter of the coolant circulating system is adjusted, to reduce row of the compressor during first operational mode
Oil mass.
Preferably, the coolant circulating system further includes outdoor fan and throttling set, and the operating parameter includes compression
The aperture of unit frequency, outdoor fan frequency and/or the throttling set.
Preferably, according to the interior machine degree of superheat of the coolant circulating system to the operating parameter of the coolant circulating system into
Row adjust method include:
When the interior machine degree of superheat is greater than or equal to the first predetermined temperature value, the compressor frequency is increased, and/or,
The outdoor fan frequency is increased, and/or, increase the aperture of the throttling set；And/or
When the interior machine degree of superheat is less than or equal to the second predetermined temperature value, the compressor frequency is reduced, and/or,
The outdoor fan frequency is reduced, and/or, reduce the aperture of the throttling set.
Preferably, first predetermined temperature value is 2.5 DEG C to 3.5 DEG C；
Second predetermined temperature value is 0.5 DEG C to 1.5 DEG C.
Preferably, according to the interior machine degree of supercooling of the coolant circulating system to the operating parameter of the coolant circulating system into
Row adjust method include:
When the interior machine degree of supercooling is greater than or equal to third predetermined temperature value, the compressor frequency is reduced, and/or,
The outdoor fan frequency is increased, and/or, increase the aperture of the throttling set；And/or
When the interior machine degree of supercooling is less than or equal to four predetermined temperature values, the compressor frequency is increased, and/or,
The outdoor fan frequency is reduced, and/or, reduce the aperture of the throttling set.
Preferably, the third predetermined temperature value is 22 DEG C to 28 DEG C；
4th predetermined temperature value is 7 DEG C to 13 DEG C.
Preferably, it before entering first operational mode, controls the compressor and carries out an oil return.
Preferably, before entering first operational mode, according in current compressor frequency and/or compressor
Oil temperature determines recirculating oil quantity and/or the oil return time of compressor oil return, and compressor is carried out by determining recirculating oil quantity and/or oil return time
Oil return.
Preferably, when exiting first operational mode, judge whether the operation duration of the first operational mode is big
In or be equal to the first scheduled duration, if so, the compressor carry out an oil return after be switched to second operational mode, it is no
Then it is directly switch to second operational mode.
Preferably, first scheduled duration is 5 to 15 minutes；And/or
The duration that the compressor carries out an oil return is 5 to 15 minutes.
Preferably, the coolant circulating system automatically exits from after first the second scheduled duration of operational mode continuous service
One operational mode.
Preferably, it after the coolant circulating system automatically exits from the first operational mode, controls the compressor and carries out one
Secondary oil return.
Preferably, it is 5 to 15 minutes that the compressor, which carries out the duration of an oil return,；And/or
Second scheduled duration is 5 to 15 minutes.
In the control method of coolant circulating system provided by the present application, coolant circulating system has without compressor oil return
The first operational mode in this operating mode can be according to the degree of superheat and/or degree of supercooling of indoor heat exchanger to refrigerant circulation
The operating parameters such as compressor frequency, outdoor fan frequency, the throttling set aperture of system are adjusted, to reduce the row of compressor
Oil mass guarantees the reliability service oil mass of the compressor during the operational mode, when user needs to protect to increase indoor band oil
When holding quiet environment, operation module can be switched to the first operational mode, to guarantee the usage comfort of user.
Detailed description of the invention
By referring to the drawings to the description of the embodiment of the present invention, the above and other purposes of the present invention, feature and
Advantage will be apparent from, in the accompanying drawings:
Fig. 1 shows one of the control method flow chart of coolant circulating system of specific embodiment of the invention offer；
Fig. 2 shows the two of the control method flow chart of the coolant circulating system of specific embodiment of the invention offer.
Specific embodiment
Below based on embodiment, present invention is described, but the present invention is not restricted to these embodiments.In order to
It avoids confusion essence of the invention, there is no narrations in detail for well known method, process, process, element.
In addition, it should be understood by one skilled in the art that provided herein attached drawing be provided to explanation purpose, and
What attached drawing was not necessarily drawn to scale.
Unless the context clearly requires otherwise, "include", "comprise" otherwise throughout the specification and claims etc. are similar
Word should be construed as the meaning for including rather than exclusive or exhaustive meaning；That is, be " including but not limited to " contains
Justice.
In the description of the present invention, it is to be understood that, term " first ", " second " etc. are used for description purposes only, without
It can be interpreted as indication or suggestion relative importance.In addition, in the description of the present invention, unless otherwise indicated, the meaning of " multiple "
It is two or more.
This application provides a kind of control method of coolant circulating system, which is suitable for single refrigeration, single heating
And the coolant circulating system of cooling and warming, it is particularly suitable in multi-variable air conditioning unit.The refrigerant circulation of coolant circulating system returns
Road is provided with compressor, indoor heat exchanger, throttling set and outdoor heat exchanger, and coolant circulating system further includes for promoting room
The outdoor fan that external heat exchanger and external environment exchange heat and the control device for carrying out various controls to coolant circulating system.
Throttling set can be the device, such as capillary, electric expansion valve etc. that can arbitrarily adjust flow.
There is coolant circulating system the first operational mode and compressor without compressor oil return to carry out conventional oil return
The second operational mode, the second operational mode for example can be at interval of a period of time compressor carry out an oil return, work as user
When needing a quiet environment, coolant circulating system can be switched to the first operational mode, in this mode, control device root
The operating parameter of coolant circulating system is adjusted according to the interior machine degree of superheat and/or interior machine degree of supercooling of coolant circulating system, is led to
The adjusting to operating parameter is crossed to reduce the oil drain quantity of compressor, to increase indoor band oil, is guaranteed in the operational mode phase
Between compressor reliability service oil mass, in addition, since compressor in this operating mode not will do it oil return, will not including
The sound that liquid flowing is generated in machine guarantees the usage comfort of user to provide the user with the quiet environment of comparison.
Wherein, the detection mode of the interior machine degree of superheat and interior machine degree of supercooling is consistent with existing detection method, is existed by setting
The temperature and pressure of temperature sensor and/or pressure sensor in coolant circulating system to position each in coolant circulating system
It is detected, the interior machine degree of superheat and interior machine degree of supercooling is calculated in control device according to testing result.The interior machine degree of superheat, that is, room
Saturation temperature corresponding to outlet refrigerant temperature-indoor heat exchanger refrigerant actual pressure of interior heat exchanger, interior machine degree of supercooling are
The import refrigerant temperature of the corresponding saturation temperature-indoor heat exchanger of the refrigerant actual pressure of indoor heat exchanger.
Operating parameter for example may include compressor frequency, outdoor fan frequency and throttling set such as electric expansion valve
Aperture etc..
Specifically, when the interior machine degree of superheat is greater than or equal to the first predetermined temperature value, compressor frequency can be increased, and/
Or, outdoor fan frequency is increased, and/or, increase the aperture of throttling set, the first predetermined temperature value therein is, for example, 2.5 DEG C
To 3.5 DEG C, further preferably 3 DEG C.In a preferred embodiment, predetermined when being greater than or equal to first for the interior machine degree of superheat
When temperature value, current compression unit frequency can be kept or compressor frequency is increased into A1Hz, the predetermined temperature of the machine degree of superheat-the first in A1=
Angle value keeps current outdoor blower frequency or outdoor fan frequency is increased B1Hz, B1=(the predetermined temperature of the interior machine degree of superheat-the first
Angle value) * 2, the aperture of throttling set such as electric expansion valve is increased into C1, C1=(interior the-the first predetermined temperature value of the machine degree of superheat) *
5PLS。
When the interior machine degree of superheat is less than or equal to the second predetermined temperature value, compressor frequency can be reduced, and/or, it reduces
Outdoor fan frequency, and/or, reducing the aperture of throttling set, the second predetermined temperature value therein is, for example, 0.5 DEG C to 1.5 DEG C,
Further preferably 1 DEG C.It in a preferred embodiment, can when the interior machine degree of superheat is greater than or equal to the second predetermined temperature
It keeps current compression unit frequency or compressor frequency is reduced into A2Hz, the second predetermined temperature value of the A2=-interior machine degree of superheat keeps working as
Outdoor fan frequency is reduced B2Hz by cup exogenous wind unit frequency, and B2=(the second predetermined temperature value-interior machine degree of superheat) * 2 will be saved
The aperture for flowing device such as electric expansion valve reduces C2, C2=(the second predetermined temperature value-interior machine degree of superheat) * 5PLS.
When interior machine degree of supercooling is greater than or equal to third predetermined temperature value, compressor frequency can be reduced, and/or, it increases
Outdoor fan frequency, and/or, increase the aperture of throttling set, third predetermined temperature therein is, for example, 22 DEG C to 28 DEG C, into one
Preferably 25 DEG C of step.In a preferred embodiment, it when interior machine degree of supercooling is greater than or equal to third predetermined temperature value, can protect
It holds current compression unit frequency or compressor frequency is reduced into A3Hz, machine degree of supercooling-third predetermined temperature value in A3=, by outdoor wind
Unit frequency increases B3Hz, B3=(interior machine degree of supercooling-third predetermined temperature value) * 2, by opening for throttling set such as electric expansion valve
Degree increases C3, C3=(interior machine degree of supercooling-third predetermined temperature value) * 5PLS.
When interior machine degree of supercooling is less than or equal to four predetermined temperature values, compressor frequency can be increased, and/or, it reduces
Outdoor fan frequency, and/or, reducing the aperture of throttling set, the 4th predetermined temperature value therein is, for example, 7 DEG C to 13 DEG C, into
One step is preferably 10 DEG C.It in a preferred embodiment, can when interior machine degree of supercooling is less than or equal to four predetermined temperature values
It keeps current compression unit frequency or compressor frequency is increased into A4Hz, the 4th predetermined temperature value of A4=-interior machine degree of supercooling will be outdoor
Blower frequency reduces B4Hz, B4=(the 4th predetermined temperature value-interior machine degree of supercooling) * 2, by throttling set such as electric expansion valve
Aperture reduces C4, C4=(the 4th predetermined temperature value-interior machine degree of supercooling) * 5PLS.
Further, before entering the first operational mode, compressor carries out an oil return, that is, is entering the first operation mould
Enough oil returns are carried out first before formula, are influencing system just because of compressor oil starvation to avoid when running the first operational mode
Often operation.The calculation formula of the mass flow of refrigerant and oil mixture is as follows in system:
M=v × P ÷ θ
In formula: m --- the mass flow kg/s of refrigerant
The discharge capacity of V --- compressor, m3/s
The frequency of P --- compressor, Hz
The inspiratory volume of θ --- compressor, m3/kg
As shown from the above formula, compressor frequency is higher, and oil extraction rate is faster, and therefore, compressor carries out returning for oil return
Oil mass and/or oil return time can determine according to current compressor frequency.
In a specific embodiment, it can be obtained in refrigerant+oil mixture shared by oil by testing detection
The oil extraction flow under current compressor frequency status then can be obtained according to above-mentioned formula, according to oil extraction flow and fortune in ratio
The oil extraction total amount of compressor can be obtained in the duration of the first operational mode of row, and recirculating oil quantity can be obtained according to oil extraction total amount,
The oil return time can also be determined according to oil return speed.
In addition, oil temperature is higher in compressor, oily meltage is more in unit mass oil+refrigerant mixture, therefore preferably
Ground, can also be determined according to oil temperature in current compressor frequency and current compressor compressor carry out oil return recirculating oil quantity and/
Or the oil return time, meltage oily in oil under different oil temperatures+refrigerant mixture can be obtained according to experiment detection, it can in conjunction with oil temperature
To obtain the ratio shared by oil in refrigerant+oil mixture, in this way, making the calculating of recirculating oil quantity more accurate.
It, can be according to the operation duration of the first operational mode after coolant circulating system exits the first operational mode
To determine whether needing to execute oil return operation to compressor immediately, when the operation duration of the first operational mode is compared with Short Compression
For machine there is no oil starvation risk, coolant circulating system can be directly switch to the second operational mode without oil return immediately, second
Conventional oil return is carried out under operational mode, and when the operation duration of the first operational mode is longer, compressor may
There are oil starvation risks to carry out one for this purpose, coolant circulating system, which exits after the first operational mode, carries out oil return to compressor immediately
The second operational mode is switched to after secondary oil return again.
In a specific embodiment, after exiting first operational mode, judge the fortune of the first operational mode
Whether row duration is greater than or equal to the first scheduled duration, if so, the compressor carries out an oil return, the otherwise pressure
Contracting machine is without oil return.First scheduled duration therein and compressor carry out oil return oil return duration be it is corresponding, first is pre-
Timing length is preferably pre-stored in control device, for example, 5 to 15 minutes, further preferably 10 minutes.When compressor is returned
When oily, oil return in 5 to 15 minutes is preferably carried out, oil return in 10 minutes is further preferably carried out.
The setting duration of the first operational mode continuous service, for example, the second scheduled duration are prestored in control device, it is cold
Matchmaker's circulatory system automatically exits from the first operational mode after first the second scheduled duration of operational mode continuous service, to avoid refrigerant
The first operational mode of circulatory system operation is too long and influences the stability of system, which can be pre-stored in control before factory
In device, it is preferable that this when a length of more limit duration, that is, when the duration of the first operational mode continuous service is more than
The normal operation of system may be will affect when the second scheduled duration, it is preferable that this when it is 5 to 15 minutes a length of, further preferably
10 minutes.
After coolant circulating system automatically exits from the first operational mode, compressor needs to carry out an oil return, recirculating oil quantity and/or
The oil return time precalculated can be stored in control device.For example, in a specific embodiment, when refrigerant circulation system
After system automatically exits from the first operational mode, compressor carries out oil return in 5 to 10 minutes.
It is, of course, understood that user can also be with the operation duration of the first operational mode of sets itself, it is preferable that when
When duration set by user is more than the duration of the above-mentioned more limit prestored, system can issue prompting, remind user may
There can be risk, to guarantee the operational reliability of system.
In a specific embodiment, as shown in Figure 1, the control method of the coolant circulating system includes the following steps:
S001, system run the second operational mode；
S002, user's operation control system are switched to the first operational mode and customized setting first by the second operational mode
The duration of operational mode is the second scheduled duration；
S003, system detection compressor current frequency and oil temperature；
S004, the recirculating oil quantity that compressor oil return is determined according to compressor frequency and oil return time；
S005, control compressor carry out pressure oil return by the S004 recirculating oil quantity determined and oil return time；
S006, systems stay run the first operational mode and carry out oil return compensation mechanism in this period；
S007, judge whether to receive the order for the first operational mode of end that user issues manually, if so, carrying out
Otherwise S008 carries out S011；
S008, system exit the first operational mode；
S009, judge whether the first operational mode duration is greater than or equal to the first scheduled duration, if so, carrying out
Otherwise S010 returns to S001；
S010, control compressor carry out forcing oil return and continue to return to S001 after ten minutes；
S011, judge whether the first operational mode duration is greater than or equal to the second scheduled duration, if so, carrying out
Otherwise S012 returns to S007；
S012, control compressor carry out forcing oil return and continue to return to S001 after ten minutes.
The control method for carrying out oil return compensation mechanism includes the following steps:
The degree of superheat and degree of supercooling of S100, detection system；
S200, compensation policy is determined according to the degree of superheat and degree of supercooling；
S300, compensation policy is executed.
Executing compensation policy includes:
S310, compressor frequency is adjusted；
S320, regulation room exogenous wind unit frequency；
S330, the aperture for adjusting throttling set.
In the control method of coolant circulating system provided by the present application, coolant circulating system has without compressor oil return
The first operational mode in this operating mode can be according to the degree of superheat and/or degree of supercooling of indoor heat exchanger to refrigerant circulation
The operating parameters such as compressor frequency, outdoor fan frequency, the throttling set aperture of system are adjusted, to reduce the row of compressor
Oil mass guarantees the reliability service oil mass of the compressor during the operational mode, when user needs to protect to increase indoor band oil
When holding quiet environment, operation module can be switched to the first operational mode, to guarantee the usage comfort of user.
Those skilled in the art will readily recognize that above-mentioned each preferred embodiment can be free under the premise of not conflicting
Ground combination, superposition.
It should be appreciated that above-mentioned embodiment is merely exemplary, and not restrictive, without departing from of the invention basic
In the case where principle, those skilled in the art can be directed to the various apparent or equivalent modification or replace that above-mentioned details is made
It changes, is all included in scope of the presently claimed invention.
Claims (13)
1. a kind of control method of coolant circulating system, which is characterized in that the coolant circulating system has without compressor
First operational mode of oil return and the second operational mode for carrying out Conventional press oil return, the control method include:
In first operational mode, according to the interior machine degree of superheat of the coolant circulating system and/or interior machine degree of supercooling to described
The operating parameter of coolant circulating system is adjusted, to reduce oil extraction of the compressor during first operational mode
Amount.
2. control method according to claim 1, which is characterized in that the coolant circulating system further include outdoor fan and
Throttling set, the operating parameter include the aperture of compressor frequency, outdoor fan frequency and/or the throttling set.
3. control method according to claim 2, which is characterized in that according to the interior machine degree of superheat of the coolant circulating system
The method that the operating parameter of the coolant circulating system is adjusted includes:
When the interior machine degree of superheat is greater than or equal to the first predetermined temperature value, the compressor frequency is increased, and/or, it increases
The outdoor fan frequency, and/or, increase the aperture of the throttling set；And/or
When the interior machine degree of superheat is less than or equal to the second predetermined temperature value, the compressor frequency is reduced, and/or, it reduces
The outdoor fan frequency, and/or, reduce the aperture of the throttling set.
4. control method according to claim 3, which is characterized in that first predetermined temperature value is 2.5 DEG C to 3.5
℃；
Second predetermined temperature value is 0.5 DEG C to 1.5 DEG C.
5. control method according to claim 2, which is characterized in that according to the interior machine degree of supercooling of the coolant circulating system
The method that the operating parameter of the coolant circulating system is adjusted includes:
When the interior machine degree of supercooling is greater than or equal to third predetermined temperature value, the compressor frequency is reduced, and/or, it increases
The outdoor fan frequency, and/or, increase the aperture of the throttling set；And/or
When the interior machine degree of supercooling is less than or equal to four predetermined temperature values, the compressor frequency is increased, and/or, it reduces
The outdoor fan frequency, and/or, reduce the aperture of the throttling set.
6. control method according to claim 5, which is characterized in that the third predetermined temperature value is 22 DEG C to 28 DEG C；
4th predetermined temperature value is 7 DEG C to 13 DEG C.
7. control method according to one of claims 1 to 6, which is characterized in that enter first operational mode it
Before, it controls the compressor and carries out an oil return.
8. control method according to claim 7, which is characterized in that before entering first operational mode, according to
Oil temperature in current compressor frequency and/or compressor determines recirculating oil quantity and/or the oil return time of compressor oil return, compressor
Oil return is carried out by determining recirculating oil quantity and/or oil return time.
9. control method according to one of claims 1 to 6, which is characterized in that when exiting first operational mode,
Judge whether the operation duration of the first operational mode is greater than or equal to the first scheduled duration, if so, the compressor into
It is switched to second operational mode after oil return of row, is otherwise directly switch to second operational mode.
10. control method according to claim 9, which is characterized in that first scheduled duration is 5 to 15 minutes；With/
Or,
The duration that the compressor carries out an oil return is 5 to 15 minutes.
11. control method according to one of claims 1 to 6, which is characterized in that the coolant circulating system is in the first fortune
The first operational mode is automatically exited from after row mode the second scheduled duration of continuous service.
12. control method according to claim 11, which is characterized in that automatically exit from first in the coolant circulating system
After operational mode, controls the compressor and carry out an oil return.
13. control method according to claim 12, which is characterized in that the compressor carry out an oil return it is lasting when
A length of 5 to 15 minutes；And/or
Second scheduled duration is 5 to 15 minutes.
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| CN114374025A (en) * | 2021-12-03 | 2022-04-19 | 东风柳州汽车有限公司 | Method, device and system for controlling cooling medium and cooling liquid for cooling power battery |
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| CN111426039A (en) * | 2020-04-03 | 2020-07-17 | 广东美的暖通设备有限公司 | Air conditioner, operation control method of air conditioner, and readable storage medium |
| CN111426039B (en) * | 2020-04-03 | 2021-10-08 | 广东美的暖通设备有限公司 | Air conditioner, operation control method of air conditioner, and readable storage medium |
| CN113294884A (en) * | 2021-06-21 | 2021-08-24 | 宁波奥克斯电气股份有限公司 | Heating control method and device and air conditioner |
| CN113294884B (en) * | 2021-06-21 | 2022-04-19 | 宁波奥克斯电气股份有限公司 | Heating control method and device and air conditioner |
| CN113587353A (en) * | 2021-08-16 | 2021-11-02 | 广东积微科技有限公司 | Control method for oil return of multi-split air conditioning system |
| CN113587353B (en) * | 2021-08-16 | 2022-07-08 | 广东积微科技有限公司 | Control method for oil return of multi-split air conditioning system |
| CN114374025A (en) * | 2021-12-03 | 2022-04-19 | 东风柳州汽车有限公司 | Method, device and system for controlling cooling medium and cooling liquid for cooling power battery |
| CN114543255A (en) * | 2021-12-24 | 2022-05-27 | 青岛海尔空调电子有限公司 | Oil return control method and device, multi-split air conditioning system and storage medium |
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