CN112460859A - Water chilling unit and control method thereof - Google Patents
Water chilling unit and control method thereof Download PDFInfo
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- CN112460859A CN112460859A CN202011457045.3A CN202011457045A CN112460859A CN 112460859 A CN112460859 A CN 112460859A CN 202011457045 A CN202011457045 A CN 202011457045A CN 112460859 A CN112460859 A CN 112460859A
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- water chilling
- condenser
- throttling element
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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
- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
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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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
Abstract
The invention provides a water chilling unit and a control method thereof, wherein the water chilling unit comprises a compressor, a condenser, a first throttling element and an evaporator, wherein a refrigerant flows through the condenser, the first throttling element and the evaporator from an air outlet of the compressor in sequence and flows back to the compressor through an air inlet of the compressor to form refrigerant circulation of a centrifugal unit, and the water chilling unit further comprises a motor cooling pipeline, and the motor cooling pipeline can guide the refrigerant flowing out of the condenser to a motor of the compressor and can flow back to the air inlet of the compressor through the evaporator. According to the invention, the refrigerant flowing out of the condenser is guided to the motor of the compressor through the motor cooling pipeline, so that the temperature of the motor can be effectively reduced, and the heat dissipation requirement of the motor under the working condition of high-pressure ratio operation is particularly met.
Description
Technical Field
The invention belongs to the technical field of air conditioning, and particularly relates to a water chilling unit and a control method thereof.
Background
Magnetic suspension centrifugal assemblies have many inherent advantages: one is that the product does not use mechanical bearings and has no mechanical friction; secondly, oil is not used, and the influence of the oil on the heat exchange efficiency of the refrigeration system is completely eliminated; thirdly, the rotating speed is high, and the three advantages jointly promote the efficiency of the magnetic suspension centrifugal machine set to be 35-60% higher than that of the conventional product.
The existing magnetic suspension centrifugal machine set is widely applied to a water cooling machine set, the technology of the existing magnetic suspension centrifugal machine set tends to be mature, the application of the magnetic suspension centrifugal machine set on the air cooling machine set becomes a development direction, when a compressor surges, the compressor is in a stall running state, and a magnetic suspension bearing is in an unstable state at the moment, so that the bearing is damaged after long-term running, and the service life of the machine set is shortened; meanwhile, the magnetic suspension unit has no refrigeration oil in the compressor and can take away partial heat of the motor, and the air-cooled magnetic suspension unit has a large pressure ratio, so that the heat productivity of the motor of the compressor is very large under the operating condition of the large pressure ratio, and the problem of cooling the motor in the unit is also urgently solved.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to provide a water chiller and a control method thereof, wherein a cooling medium flowing out of a condenser is guided to a motor of a compressor through a motor cooling pipeline, so that the temperature of the motor can be effectively reduced, and the heat dissipation requirement of the motor under a high pressure ratio operation condition is particularly satisfied.
In order to solve the above problems, the present invention provides a water chilling unit, which includes a compressor, a condenser, a first throttling element, an evaporator, a motor cooling pipeline, and a motor cooling pipeline, wherein a refrigerant flows through the condenser, the first throttling element, the evaporator from an air outlet of the compressor in sequence, and flows back to the compressor through an air inlet of the compressor to form a refrigerant circulation of a centrifugal unit, and the motor cooling pipeline can guide the refrigerant flowing out of the condenser to a motor of the compressor and flows back to the air inlet of the compressor through the evaporator.
Preferably, a second throttling element is arranged on a section of the motor cooling pipeline entering the compressor on a refrigerant flow path in the motor cooling pipeline.
Preferably, the water chilling unit further comprises an air supplement pipeline, an economizer is arranged on a pipeline between the first throttling element and the condenser, the compressor is provided with an air supplement port, and the air supplement pipeline can guide gaseous refrigerant in the economizer to the air supplement port.
Preferably, the water chilling unit further comprises a bypass pipeline, a first end of the bypass pipeline is connected with an air outlet of the compressor, a second end of the bypass pipeline is communicated with a refrigerant pipeline of the evaporator so as to achieve selective communication between the air outlet of the compressor and the evaporator, and a motor rotating shaft in the compressor is supported by a magnetic suspension bearing.
Preferably, a first electromagnetic valve is arranged on the bypass pipeline.
Preferably, the bypass pipeline and the air outlet of the compressor are connected to a first position, and a check valve is arranged on a pipeline between the first position and the condenser.
Preferably, the water chilling unit further comprises a pressure balance pipeline, a first end of the pressure balance pipeline is connected to the bypass pipeline between the first electromagnetic valve and the first position, and a second end of the pressure balance pipeline is communicated with the air inlet of the compressor so as to realize selective communication between the air outlet and the air inlet of the compressor.
Preferably, a second electromagnetic valve is arranged on the pressure balancing pipeline.
The invention also provides a control method of the water chilling unit, which is used for controlling the water chilling unit and comprises the following steps:
obtaining a motor temperature Tdj of the compressor;
comparing the motor temperature Tdj with a motor first temperature threshold value Tmax;
and when Tdj is larger than or equal to Tmax, controlling to increase the opening of the second throttling element.
Preferably, when Tdj < Tmax, comparing Tdj with the magnitude relation of the second temperature threshold value Tc of the motor, wherein Tc is Tmax-c, c is the floating value of the temperature, and c >;
when Tdj is less than or equal to Tmax-c, controlling to reduce the opening of the second throttling element; alternatively, the first and second electrodes may be,
and when Tdj is larger than Tmax-c, controlling the opening degree of the second throttling element to be unchanged.
Preferably, when the water chilling unit includes a bypass line and the bypass line is not through, before obtaining the motor temperature Tdj of the compressor, the method further includes:
acquiring a real-time operation frequency Fs, a real-time minimum operation frequency Fmin, a maximum design operation frequency Fmax and a first preset frequency value Fy of a compressor;
comparing the size relation between Fs and Fmin and the size relation between (Fmax-Fmin) and Fy;
when Fs is larger than or equal to Fmin and (Fmax-Fmin) < Fy, controlling the conduction of a bypass pipeline, and acquiring the supercooling degree Tgl of the refrigerant at the outlet of the condenser;
comparing the magnitude relation between the supercooling degree Tgl and the preset supercooling degree Tgls of the refrigerant at the outlet of the condenser;
when Tgl < Tgls, controlling to reduce the opening of the first throttling element.
Preferably, the first and second electrodes are formed of a metal,
when Tgl is more than or equal to Tgls, comparing the size relation between the supercooling degree Tgl and the minimum supercooling degree Tglmin of the refrigerant at the outlet of the condenser, wherein Tglmin is more than Tgls,
when Tglmin is more than or equal to Tgl and more than or equal to Tgls, controlling to reduce the opening of the first throttling element; alternatively, the first and second electrodes may be,
when Tgl > Tglmin, obtaining Tdj;
comparing Tdj with the magnitude relationship of Tmax;
and when Tdj is larger than or equal to Tmax, controlling to increase the opening of the second throttling element.
Preferably, when the bypass pipeline is controlled to be conducted, the opening degree of the second throttling element is controlled to be adjusted to a first preset opening degree at the same time.
According to the water chilling unit and the control method thereof, the motor cooling pipeline guides the refrigerant flowing out of the condenser 2 to the motor of the compressor 1, so that the temperature of the motor is effectively reduced, and the heat dissipation requirement of the motor under the working condition of high-pressure ratio operation is particularly met.
Drawings
Fig. 1 is a schematic system structure diagram of a water chilling unit according to an embodiment of the present invention;
fig. 2 is a logic flow diagram of a control method of a water chilling unit according to another embodiment of the present invention.
The reference numerals are represented as:
1. a compressor; 2. a condenser; 21. a check valve; 3. a first throttling element; 4. an evaporator; 5. an economizer; 6. a ball valve; 7. drying the filter; 100. a bypass line; 101. a first solenoid valve; 200. a pressure balancing line; 201. a second solenoid valve; 300. a motor cooling pipeline; 301. a second throttling element; 400. and (4) an air supplement pipeline.
Detailed Description
Referring to fig. 1 to 2 in combination, according to an embodiment of the present invention, a water chiller is provided, which includes a compressor 1, a condenser 2, a first throttling element 3, an evaporator 4, a refrigerant flowing from an air outlet of the compressor 1 through the condenser 2, the first throttling element 3, the evaporator 4 in sequence and flowing back to the compressor 1 through an air inlet of the compressor 1 to form a refrigerant cycle of a centrifugal chiller, and a motor cooling pipeline 300, where the motor cooling pipeline 300 is capable of guiding the refrigerant flowing out of the condenser 2 to a motor of the compressor 1 and flowing back to the air inlet of the compressor 1 through the evaporator 4. In the technical scheme, the motor cooling pipeline guides the refrigerant flowing out of the condenser 2 to the motor of the compressor 1, so that the temperature of the motor is effectively reduced, and the heat dissipation requirement of the motor under the operation condition of a high pressure ratio is particularly met.
It can be understood that the motor cooling pipeline 300 is located at a pipeline section of the compressor 1, and has a pipeline section capable of exchanging heat with the motor and the magnetic suspension bearing, so that the motor and the magnetic suspension bearing are cooled by using a circulating refrigerant of a water chilling unit. Further, on a refrigerant flow path in the motor cooling pipeline 300, a second throttling element 301 is disposed on a pipe section of the motor cooling pipeline 300 entering the compressor 1, and the second throttling element 301 can adjust the refrigerant flow rate in the motor cooling pipeline 300 by adjusting the opening degree thereof.
In some embodiments, the chiller further has an air supply line 400, an economizer 5 is provided on a line between the first throttling element 3 and the condenser 2, the compressor has an air supply port, and the air supply line 400 can guide the gaseous refrigerant in the economizer 5 to the air supply port, so that the compressor 1 with the air supply port is more energy-efficient.
A plurality of ball valves 6 and a dry filter 7 are further provided on a refrigerant pipe between the condenser 2 and the economizer 5.
The evaporator 4 may be, for example, a shell-and-tube evaporator, and the first throttling element 3 and the second throttling element 301 may be implemented by electronic expansion valves.
In the technical scheme, the bypass pipeline is arranged between the air outlet of the compressor 1 and the evaporator 4, and the bypass pipeline 100 can be conducted under the preset condition, so that the flow of the compressor is increased, the pressure ratio of the compressor is reduced, the magnetic suspension bearing can be under the working condition of relatively smaller pressure ratio, the stable operation of the magnetic suspension bearing is ensured, the damage probability of the bearing is reduced, and the service life of a unit is prolonged. Specifically, the bypass line 100 can be selectively penetrated by providing a first solenoid valve 101 in the bypass line 100.
In some embodiments, the bypass line 100 and the air outlet of the compressor 1 are connected to a first location (that is, the air outlet line of the compressor 1), a check valve 21 is disposed on a line between the first location and the condenser 2, and the check valve 21 is disposed to block communication between the high-pressure refrigerant in the condenser 2 and the compressor 1 under some operating conditions, for example, after the compressor 1 stops, so as to prevent the high-pressure refrigerant from flowing back into the compressor 1, further, the chiller further includes a pressure balance line 200, a first end of the pressure balance line 200 is connected to the bypass line 100 between the first electromagnetic valve 101 and the first location, a second end of the pressure balance line 200 is communicated with the air inlet of the compressor 1 to achieve selective communication between the air outlet and the air inlet of the compressor 1, the pressure balance pipeline 200 can be communicated under a preset condition, for example, when the compressor 1 is stopped, so that pressure balance at two ends of the compressor 1 is realized, which is beneficial to the stable falling of the magnetic suspension bearing, and the damage probability of the magnetic suspension bearing is reduced. For example, a second solenoid valve 201 may be provided on the pressure compensation line 200, so as to enable selective communication of the pressure compensation line 200.
According to an embodiment of the present invention, there is also provided a control method of a water chilling unit, for controlling the water chilling unit, including the steps of:
acquiring a motor temperature Tdj of the compressor 1;
comparing the motor temperature Tdj with a motor first temperature threshold value Tmax;
when Tdj is greater than or equal to Tmax, control increases the opening of the second throttling element 301.
In the technical scheme, when the temperature of the motor is higher than the first temperature threshold of the motor, the opening degree of the second throttling element 301 on the motor cooling pipeline 300 is controlled to be increased, so that the flow of the refrigerant for cooling the motor is increased, and the motor can be cooled in time.
Further, when Tdj < Tmax, comparing Tdj with a motor second temperature threshold value Tc, wherein Tc is Tmax-c, c is a temperature floating value, and c is greater than 0, and is characterized in that whether the motor temperature is too low; at this time, when Tdj is less than or equal to Tmax-c, the temperature of the motor is too low, which has an adverse effect on the performance of the motor, so that the control reduces the opening degree of the second throttling element 301, and reduces the cooling capacity of the motor; when Tdj is greater than Tmax-c, the motor temperature is moderate, and the opening degree of the second throttling element 301 is controlled to be unchanged, that is, the opening degree of the second throttling element 301 is controlled to be kept unchanged.
In some embodiments, when the water chilling unit includes the bypass line 100 and the bypass line 100 is not through, before obtaining the motor temperature Tdj of the compressor 1, the method further includes:
acquiring a real-time operation frequency Fs of the compressor 1, a real-time minimum operation frequency Fmin of the compressor, a maximum design operation frequency Fmax of the compressor and a first preset frequency value Fy;
comparing the size relation between Fs and Fmin and the size relation between (Fmax-Fmin) and Fy;
when Fs is larger than or equal to Fmin and (Fmax-Fmin) < Fy, indicating that the magnetic suspension bearing has a stall risk at the moment, namely judging whether a destabilization risk exists or not, controlling the bypass pipeline 100 to be conducted at the moment, and acquiring the supercooling degree Tgl of the refrigerant at the outlet of the condenser 2;
comparing the magnitude relation between the supercooling degree Tgl and the preset supercooling degree Tgls of the refrigerant at the outlet of the condenser;
when Tgl < Tgls, control decreases the opening of the first throttling element 3.
In the technical scheme, on one hand, the real-time operation stability of the compressor 1 is judged through the size relation between Fs and Fmin and the size relation between (Fmax-Fmin) and Fy, and then when the conditions are met, the bypass pipeline 100 is conducted, the flow of the compressor is increased, the pressure ratio of the compressor is reduced, the magnetic suspension bearing can be enabled to be under a relatively small pressure ratio working condition, the surge phenomenon of the compressor is effectively prevented, so that the stable operation of the magnetic suspension bearing is ensured, the damage probability of the bearing is reduced, and the service life of a unit is prolonged, the surge phenomenon in the prior art is generally judged under the condition that the current of the compressor vibrates and stalls, the current change of the compressor is not obvious in the stall state, the actual operation frequency Fs reaches an anti-surge line, the surge of the unit cannot be judged through the current state, the actual compressor is in the unstable state, and the stall bearing, the bearing is damaged due to long-term operation, the service life of the unit is shortened, the actual operation frequency Fs possibly reaches or approaches to Fmax, and the compressor cannot continuously increase the frequency at the moment, and the technical scheme of the invention is adopted, specifically, the flow of the compressor is increased by opening the first electromagnetic valve 101, so that the stalling phenomenon is eliminated, and the bearing stability of the compressor in the operation process is ensured; on the other hand, considering that the refrigerant pressure in the condenser 2 is reduced when the bypass pipeline 100 is through, which may have a hidden danger that the supercooling degree of the refrigerant at the outlet of the condenser 2 is reduced, and further affect the cooling capacity of the motor cooling pipeline 300 on the motor, in this technical scheme, whether to control the opening degree of the first throttling element 3 to change is determined by obtaining the supercooling degree of the refrigerant at the outlet of the condenser and comparing the obtained supercooling degree with the preset supercooling degree Tgls, specifically, when Tgl is less than Tgls, the opening degree of the first throttling element 3 is controlled to be reduced, and further the refrigerant pressure in the condenser 2 can be increased, and further the cooling capacity of the motor cooling pipeline 300 on the motor is ensured.
When Tgl < Tgls indicates insufficient supercooling of the refrigerant at the outlet of the condenser 2 as described above, it directly indicates insufficient cooling capacity of the motor cooling circuit 300, and thus it is possible to directly control to reduce the opening degree of the first throttling element 3, on the contrary, when Tgl is larger than or equal to Tgls, the refrigerant at the outlet of the condenser 2 has a certain degree of supercooling, but the cooling capacity of the motor still has difference due to the degree of supercooling, at this time, the relationship between the degree of supercooling Tgl and the minimum degree of supercooling Tglmin of the refrigerant at the outlet of the condenser can be further compared, wherein Tglmin is greater than Tgls, when Tglmin is greater than or equal to Tgls, the opening degree of the first throttling element 3 is controlled to be reduced, namely the degree of supercooling of the refrigerant at the outlet of the condenser 2 at this time is not enough although it is sufficient, the supercooling degree of the first throttling element 3 can be further increased by reducing the opening degree thereof; and when Tgl is greater than Tglmin, the supercooling degree of the refrigerant in the motor cooling pipeline 300 is enough, the Tdj can be obtained, the size relationship between the Tdj and the Tmax is compared, and when Tdj is greater than or equal to the Tmax, the opening degree of the second throttling element 301 is controlled to be increased.
In some embodiments, when the bypass line 100 is controlled to be conducted, the opening degree of the second throttling element 301 may also be controlled to be adjusted to a first preset opening degree, a specific value of the first preset opening degree may be obtained through experiments, and this control step is provided to prevent a sudden increase of the motor temperature, which may be caused by a severe decrease of the cooling capacity due to an extreme insufficient degree of supercooling of the refrigerant in the motor cooling line 300 caused by a sudden drop of the refrigerant pressure of the condenser 2 after the bypass line 100 is conducted, and the cooling capacity of the motor cooling line 300 may be ensured to some extent by adjusting the opening degree in a preset manner.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.
Claims (13)
1. The utility model provides a water chilling unit, characterized in that, includes compressor (1), condenser (2), first throttling element (3), evaporimeter (4), the refrigerant by the gas outlet of compressor (1) flows through in proper order condenser (2), first throttling element (3), evaporimeter (4) and via the air inlet of compressor (1) flows back to form centrifugal unit's refrigerant circulation in compressor (1), still includes motor cooling pipeline (300), motor cooling pipeline (300) can be with by the refrigerant that condenser (2) flow out guide to the motor department of compressor (1) and via evaporimeter (4) flow back to the air inlet of compressor (1).
2. The water chilling unit according to claim 1, characterized in that a second throttling element (301) is provided on a section of the motor cooling line (300) entering the compressor (1) on a refrigerant flow path in the motor cooling line (300).
3. The water chilling unit according to claim 2, characterized in that an air supply line (400) is provided, an economizer (5) is provided on a line between the first throttling element (3) and the condenser (2), the compressor (1) has an air supply port, and the air supply line (400) is capable of guiding gaseous refrigerant in the economizer (5) to the air supply port.
4. The water chilling unit according to claim 1, further comprising a bypass pipeline (100), wherein a first end of the bypass pipeline (100) is connected to an air outlet of the compressor (1), a second end of the bypass pipeline (100) is communicated with a refrigerant pipeline of the evaporator (4) to achieve selective communication between the air outlet of the compressor (1) and the evaporator (4), and a motor rotating shaft in the compressor (1) is supported by a magnetic suspension bearing.
5. Water chilling unit according to claim 4, characterized in that the bypass line (100) is provided with a first solenoid valve (101).
6. Water chilling unit according to claim 5, characterized in that the bypass line (100) is connected to the outlet of the compressor (1) in a first position, and a check valve (21) is arranged in the line between the first position and the condenser (2).
7. The water chilling unit according to claim 6, further comprising a pressure balancing line (200), a first end of the pressure balancing line (200) being connected to the bypass line (100) between the first solenoid valve (101) and the first position, a second end of the pressure balancing line (200) being in communication with an air inlet of the compressor (1) to enable selective communication between an air outlet and an air inlet of the compressor (1).
8. Water chilling unit according to claim 7, characterized in that a second solenoid valve (201) is provided on the pressure balancing line (200).
9. A control method of a water chiller for controlling the water chiller according to any one of claims 2 to 8, comprising the steps of:
obtaining a motor temperature Tdj of the compressor (1);
comparing the motor temperature Tdj with a motor first temperature threshold value Tmax;
when Tdj is larger than or equal to Tmax, the opening degree of the second throttling element (301) is controlled to be increased.
10. The control method according to claim 9,
when Tdj < Tmax, comparing Tdj with a second temperature threshold value Tc of the motor, wherein Tc is Tmax-c, c is a temperature floating value, and c is more than 0;
when Tdj is less than or equal to Tmax-c, controlling to reduce the opening of the second throttling element (301); alternatively, the first and second electrodes may be,
when Tdj is larger than Tmax-c, the opening degree of the second throttling element (301) is controlled to be unchanged.
11. The control method of the water chilling unit according to claim 9, wherein when the water chilling unit includes a bypass line (100) and the bypass line (100) is not through, before obtaining the motor temperature Tdj of the compressor (1), the method further comprises:
acquiring a real-time operation frequency Fs, a real-time minimum operation frequency Fmin, a maximum design operation frequency Fmax and a first preset frequency value Fy of a compressor (1);
comparing the size relation between Fs and Fmin and the size relation between (Fmax-Fmin) and Fy;
when Fs is larger than or equal to Fmin and (Fmax-Fmin) < Fy, controlling the conduction of a bypass pipeline (100) and obtaining the supercooling degree Tgl of the refrigerant at the outlet of the condenser (2);
comparing the magnitude relation between the supercooling degree Tgl and the preset supercooling degree Tgls of the refrigerant at the outlet of the condenser;
when Tgl < Tgls, controlling to reduce the opening of the first throttling element (3).
12. The control method of a water chilling unit according to claim 11,
when Tgl is more than or equal to Tgls, comparing the size relation between the supercooling degree Tgl and the minimum supercooling degree Tglmin of the refrigerant at the outlet of the condenser, wherein Tglmin is more than Tgls,
when Tglmin is more than or equal to Tgl and more than or equal to Tgls, controlling to reduce the opening degree of the first throttling element (3); alternatively, the first and second electrodes may be,
when Tgl > Tglmin, obtaining Tdj;
comparing Tdj with the magnitude relationship of Tmax;
when Tdj is larger than or equal to Tmax, the opening degree of the second throttling element (301) is controlled to be increased.
13. The control method of the water chilling unit according to claim 11, characterized by controlling the opening degree of the second throttling element (301) to be adjusted to a first preset opening degree at the same time when the bypass pipeline (100) is controlled to be conducted.
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| CN117145999A (en) * | 2023-07-21 | 2023-12-01 | 江森自控日立万宝空调(广州)有限公司 | Refrigerant control method, system, device and storage medium |
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| CN114198828A (en) * | 2021-11-22 | 2022-03-18 | 青岛海尔空调电子有限公司 | Air suspension unit system and control method |
| CN114198828B (en) * | 2021-11-22 | 2024-03-22 | 青岛海尔空调电子有限公司 | Air suspension unit system and control method |
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