CN212511970U - Refrigerant recovery system, compressor test device and air conditioning system - Google Patents
Refrigerant recovery system, compressor test device and air conditioning system Download PDFInfo
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- CN212511970U CN212511970U CN202021896475.0U CN202021896475U CN212511970U CN 212511970 U CN212511970 U CN 212511970U CN 202021896475 U CN202021896475 U CN 202021896475U CN 212511970 U CN212511970 U CN 212511970U
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Abstract
The utility model provides a refrigerant recovery system, compressor test device and air conditioning system, wherein, refrigerant recovery system includes: the oil separator is arranged between a suction inlet and a recovery end of the recovery compressor. In the refrigerant recovery system, the compressor test device and the air conditioning system that this application provided, through set up the oil separator between the suction inlet of the recovery end at the refrigerant and recovery compressor for oil in the refrigerant can not be accumulated among the recovery compressor, reduces from this the fault rate of recovery compressor, in addition utilize control system can retrieve the refrigerant totally, further improve refrigerant recovery efficiency.
Description
Technical Field
The application relates to the technical field of compressors, in particular to a refrigerant recovery system, a compressor testing device and an air conditioning system.
Background
Existing air conditioning systems typically include a compressor, an oil separator, a four-way reversing valve, a reservoir, an outdoor heat exchanger, a throttling device, and an indoor heat exchanger. The compressor is a core device of the air conditioning system and can compress a refrigerant to participate in circulation.
In order to recycle the refrigerant and avoid the refrigerant from being directly discharged to pollute the loop, a compressor testing station (such as a durable station or a refrigeration station) usually needs to recover the refrigerant from the tested compressor and the connecting pipeline thereof after the compressor testing is finished. The refrigerant recovery of present compressor test bench position is generally gone on through external recovery compressor, and the refrigerant of retrieving is sent and is carried to the reservoir or the external recovery tank of being surveyed the compressor.
However, in the actual recycling process, it is found that the refrigerant in the compressor and the pipeline cannot be recycled completely because the operation time of the recycling compressor is short (generally within 10 seconds). Moreover, after long-time operation, oil dissolved in the refrigerant can be slowly accumulated in the recovery compressor, so that the oil level of the recovery compressor is continuously increased, and the current of the coil is increased until the coil is burnt out. Therefore, the conventional recovery compressor often fails to operate. In addition, the refrigerants with certain combustibility such as R32 and R290 have certain safety hazards if the refrigerants are not recovered cleanly and leak on site.
SUMMERY OF THE UTILITY MODEL
To the defect among the prior art, the utility model aims to provide a refrigerant recovery system, compressor test device and air conditioning system has overcome prior art's difficulty, can avoid the refrigerant to retrieve unclean problem, improves the recovery efficiency of refrigerant to reduce the fault rate of retrieving the compressor.
According to an aspect of the utility model, a refrigerant recovery system is provided, refrigerant recovery system includes: the device comprises a tested compressor, an air suction pipeline, an exhaust pipeline, a vacuum gauge, an oil separator, a recovery compressor and a control unit;
one end of each of the suction pipeline and the exhaust pipeline is connected with the tested compressor, the other end of each of the suction pipeline and the exhaust pipeline is connected to a recovery end, the recovery compressor is connected with the recovery end, the oil separator is arranged between a suction inlet and the recovery end of the recovery compressor, and the vacuum gauge is arranged in the suction pipeline;
the control unit comprises a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, a fourth electromagnetic valve and a fifth electromagnetic valve, the first electromagnetic valve is arranged between the air suction pipeline and an external evaporator, the second electromagnetic valve is arranged between the exhaust pipeline and an external condenser, the third electromagnetic valve is arranged between the air suction pipeline and the recovery end, the fourth electromagnetic valve is arranged between the recovery end and the oil separator, and one end of the fifth electromagnetic valve is connected with a discharge port of the recovery compressor.
Optionally, in the refrigerant recovery system, the control unit further includes a main control system, the first to fifth electromagnetic valves are all connected to the main control system, and the main control system is configured to control on and off of the first to fifth electromagnetic valves.
Optionally, in the refrigerant recovery system, the refrigerant recovery system further includes: a low voltage control and a high voltage control;
the low-pressure control device is arranged in the air suction pipeline and used for detecting whether the pressure of the air suction pipeline exceeds a set lower limit or not and sending a signal to the main control system;
the high-pressure control device is arranged in the exhaust pipeline and used for detecting whether the pressure of the exhaust pipeline exceeds a set upper limit or not and sending a signal to the main control system.
Optionally, in the refrigerant recovery system, the refrigerant recovery system further includes: a first sensing unit and a second sensing unit;
the first sensing unit comprises a first temperature sensor and a first pressure sensor, and the first temperature sensor and the first pressure sensor are both arranged in the air suction pipeline and are used for respectively sensing the temperature and the pressure of the air suction pipeline;
the second sensing unit comprises a second temperature sensor and a second pressure sensor, and the second temperature sensor and the second pressure sensor are both arranged in the exhaust pipeline and used for respectively sensing the temperature and the pressure of the exhaust pipeline.
Optionally, in the refrigerant recovery system, the refrigerant recovery system further includes: an air suction hose and an air discharge hose;
the pressure-measured compressor is connected with the air suction pipeline through the air suction hose, and the pressure-measured compressor is connected with the air exhaust pipeline through the air exhaust hose.
Optionally, in the refrigerant recovery system, the other end of the fifth electromagnetic valve is connected to the condenser, and the oil separator is provided with an oil drain valve.
Optionally, the refrigerant recovery system further includes a recovery tank, and the recovery tank is connected to the discharge port of the recovery compressor through the other end of the fifth electromagnetic valve.
According to the utility model discloses a compressor test device is provided in another aspect, compressor test device includes as above refrigerant recovery system.
According to another aspect of the present invention, there is provided an air conditioning system, comprising the refrigerant recovery system as described above.
The utility model provides an among refrigerant recovery system, compressor test device and air conditioning system, through set up the oil separator between the sunction inlet at the recovery end of refrigerant and recovery compressor for oil in the refrigerant can not accumulate among the recovery compressor, reduce from this the fault rate of recovery compressor utilizes control system can further improve refrigerant recovery efficiency in addition, retrieves the refrigerant totally, and then avoids leaking the problem that causes environmental pollution and potential safety hazard because of the refrigerant.
Drawings
The technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments so that the features and advantages of the present invention will be more apparent.
Fig. 1 is a schematic structural view of a refrigerant recovery system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a refrigerant testing machine according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a refrigerant recovery system according to another embodiment of the present invention.
Detailed Description
Detailed descriptions will be given below of embodiments of the present invention. Although the invention will be described and illustrated in connection with certain specific embodiments, it should be understood that the invention is not limited to these embodiments. On the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the scope of the invention as defined by the appended claims.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present invention. It will be understood by those skilled in the art that the present invention may be practiced without these specific details. In other instances, well-known structures and components have not been described in detail so as not to obscure the present invention.
The technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments so that the features and advantages of the present invention will be more apparent.
Please refer to fig. 1, which is a schematic structural diagram of a refrigerant recovery system according to an embodiment of the present invention. As shown in fig. 1, the refrigerant recovery system 10 includes: a tested compressor 1, an air suction pipeline (the reference numbers in the figure are not shown), an air exhaust pipeline (the reference numbers in the figure are not shown), a vacuum gauge 2, an oil separator 3, a recovery compressor 4 and a control unit; one end of each of the suction pipe and the exhaust pipe is connected to the compressor 1 to be tested, the other end of each of the suction pipe and the exhaust pipe is connected to a recovery end R, the recovery compressor 4 is connected to the recovery end R, the oil separator 3 is disposed between a suction port of the recovery compressor 4 and the recovery end R, the vacuum gauge 2 is disposed in the suction pipe, the control unit includes a first solenoid valve EV1, a second solenoid valve EV2, a third solenoid valve EV3, a fourth solenoid valve EV4 and a fifth solenoid valve EV5, the first solenoid valve EV1 is disposed between the suction pipe and an external evaporator 21, the second solenoid valve EV2 is disposed between the exhaust pipe and an external condenser 22, the third solenoid valve EV3 is disposed between the suction pipe and the recovery end R, and the fourth solenoid valve EV4 is disposed between the recovery end R and the oil separator 3, the fifth electromagnetic valve EV5 is provided between the discharge port of the recovery compressor 4 and the condenser 22.
Specifically, an air suction port of the compressor 1 to be tested is connected with one end of the air suction pipeline, an air exhaust port of the compressor 1 to be tested is connected with one end of the air exhaust pipeline, the vacuum gauge 2 is arranged in the air suction pipeline, the other end of the air suction pipeline and the other end of the air exhaust pipeline are both connected to a recovery end R, an air suction port of the recovery compressor 4 is connected with the recovery end R, and the oil separator 3 is arranged between the air suction port of the recovery compressor 4 and the recovery end R.
An oil discharge valve NV3 is arranged on the oil separator 3, and oil in the oil separator 3 can be manually or automatically discharged through the oil discharge valve NV 3.
As shown in fig. 1, the refrigerant recovery system 10 further includes: a suction hose 5 and an exhaust hose 6, the compressor 1 being tested being connected to the suction pipe through the suction hose 5, and the compressor 1 being tested being connected to the exhaust pipe through the exhaust hose 6.
As shown in fig. 1, the refrigerant recovery system 10 further includes a first sensing unit and a second sensing unit, the first sensing unit includes a first temperature sensor T1 and a first pressure sensor P1, the first temperature sensor T1 and a first pressure sensor P1 are both disposed in the air intake duct, the first temperature sensor T1 is used for sensing a temperature of the air intake duct, the first pressure sensor P1 is used for sensing a pressure of the air intake duct, the second sensing unit includes a second temperature sensor T2 and a second pressure sensor P2, the second temperature sensor T2 and a second pressure sensor P2 are both disposed in the air exhaust duct, the second temperature sensor T2 is used for sensing a temperature of the air exhaust duct, and the second pressure sensor P2 is used for sensing a pressure of the air exhaust duct.
Referring to fig. 1, the control unit further includes a main control system (not shown), the first electromagnetic valve EV1 to the fifth electromagnetic valve EV5 are connected to the main control system, the main control system is configured to control the on and off of the first electromagnetic valve EV1 to the fifth electromagnetic valve EV5, the refrigerant recovery system 10 further includes a low-pressure control LC and a high-pressure control HC, the low-pressure control LC is disposed in the suction pipe and is configured to detect whether the pressure of the suction pipe exceeds a set lower limit and send a signal to the main control system, and the high-pressure control LC is disposed in the exhaust pipe and is configured to detect whether the pressure of the exhaust pipe exceeds a set upper limit and send a signal to the main control system.
Correspondingly, the embodiment also provides a refrigerant recovery method. Referring to fig. 1, the refrigerant recycling method includes:
step one, providing the refrigerant recovery system 10;
step two, closing the first electromagnetic valve EV1, and recycling the refrigerant in the suction pipeline into the condenser 22 through the tested compressor 1 until the reading of the vacuum gauge 2 reaches the set value
Step three, closing the second electromagnetic valve EV2 and the tested compressor 1;
opening a third electromagnetic valve EV3, a fourth electromagnetic valve EV4 and a fifth electromagnetic valve EV5, and starting the recovery compressor 4 until the reading of the vacuum gauge 2 reaches a set value;
step five, closing the recovery compressor 4, the fourth electromagnetic valve EV4 and the fifth electromagnetic valve EV5, and acquiring the reading of the vacuum gauge 2; if the reading of the vacuum gauge 2 does not rise back within the preset time, the recovery is finished; if the reading of the vacuum gauge 2 rises back within a predetermined time, the fourth step and the fifth step are repeated.
Specifically, first, the refrigerant recovery system 10 as described above is provided. When the compressor system test is finished, the refrigerant recovery system 10 starts to recover the refrigerant. At this time, the compressor 1 is not stopped.
Next, the first electromagnetic valve EV1 (i.e. the suction valve) is closed, and the refrigerant in the suction pipe is recovered to the condenser 22 by the compressor 1 until the reading of the vacuum gauge 2 reaches a first set value (e.g. 500 Pa);
then, the second solenoid valve EV2 (i.e., the exhaust valve) and the subject compressor 1 are closed;
thereafter, the third solenoid valve EV3 (balancing valve), the fourth solenoid valve EV4 and the fifth solenoid valve EV5 are opened and the recovery compressor 4 is started until the reading of the vacuum gauge 2 reaches a second set value (for example 500 Pa);
thereafter, the recovery compressor 4, the fourth solenoid valve EV4 and the fifth solenoid valve EV5 are closed, and a reading is taken looking at the vacuum gauge 2.
If the reading of the vacuum gauge 2 does not rise back within the preset time (5 seconds), the recovery is finished; if the reading of the vacuum gauge 2 rises back within a predetermined time (5 seconds), the above-mentioned fourth and fifth steps are repeated. That is, the third solenoid valve EV3 (balancing valve), the fourth solenoid valve EV4 and the fifth solenoid valve EV5 are re-opened and the recovery compressor 4 is started until the reading of the vacuum gauge 2 reaches the second set value (for example, 500 Pa). Thereafter, the recovery compressor 4, the fourth electromagnetic valve EV4, and the fifth electromagnetic valve EV5 are closed. Wait a certain time (e.g., 5 seconds) to see the reading of gauge 2 until the reading of gauge 2 does not rise back within a predetermined time (5 seconds).
The first setting value, the second setting value and the predetermined time are only examples, but not limited, and a person skilled in the art may set the first setting value, the second setting value and the predetermined time according to actual needs.
In this embodiment, the first set value and the second set value are both 500Pa, and the predetermined time is 5 seconds. In other embodiments, the first set value and the second set value may also be 300Pa, 400Pa, 600Pa or other pressure set values, and the predetermined time may also be 3 seconds, 4 seconds, 6 seconds or other predetermined times, which is not limited herein.
Correspondingly, the present embodiment further provides an air conditioning system, which includes the refrigerant recovery system 10 as described above.
Correspondingly, the present embodiment further provides a compressor testing apparatus, which includes the refrigerant recovery system 10 as described above. The compressor testing device comprises a refrigerant testing machine, a durable platform, a cold platform or other testing equipment.
The compressor testing device provided by the embodiment is described below by taking a refrigerant testing machine as an example, and the refrigerant testing machine can simulate the operation of the refrigeration and heating working conditions of the compressor air conditioner.
Please refer to fig. 1 and fig. 2, which are schematic structural diagrams of a refrigerant testing machine according to an embodiment of the present invention. As shown in fig. 1 and 2, the refrigerant testing machine 100 includes: the system comprises a vacuumizing system, a tested machine system, a refrigerant recovery system 10 and a four-way reversing valve 9, wherein the tested machine system is connected with the refrigerant recovery system 10 through the four-way reversing valve 9, the vacuumizing system is connected with a suction pipeline of the refrigerant recovery system 10 and is connected with an exhaust pipeline of the refrigerant recovery system 10 through a third electromagnetic valve EV 3.
Specifically, the vacuum pumping system includes a vacuum pump 31, and the vacuum pump 31 is connected to the refrigerant recovery system 10 through a second stop valve NV 2. The tested machine system comprises an evaporator 21, a condenser 22, a first fan 23, a second fan 24, a system liquid storage device 25, a drying filter 26, a throttling device and four one-way valves, wherein the evaporator 21, the system liquid storage device 25, the drying filter 26, the throttling device and the condenser 22 are sequentially connected, the first fan 23 is aligned with the evaporator 21, the second fan 24 is aligned with the condenser 22, a first one-way valve CK1 and a second one-way valve CK2 are arranged in the same direction, the first one-way valve CK1 is connected between the throttling device and the condenser 22, a refrigerant flows to the condenser 22 through the first one-way valve CK1, the second one-way valve CK2 is connected between the throttling device and the evaporator 21, the refrigerant flows to the evaporator 21 through the second one-way valve CK2, a third one-way valve CK3 and a fourth one-way valve CK4 are arranged in the same direction, and the third one-way valve CK3 is connected between the condenser 22 and the system liquid storage device 3, the refrigerant flows to the system accumulator 25 through the third check valve CK3, the fourth check valve CK4 is connected between the evaporator 21 and the system accumulator 25, and the refrigerant flows to the system accumulator 25 through the fourth check valve CK 4.
The throttling device comprises a capillary tube 27, a sixth electromagnetic valve EV6 and a bidirectional electronic expansion valve EXV1 which are arranged in parallel, and a throttling unit consisting of the capillary tube 27 and the sixth electromagnetic valve EV6 is arranged in parallel with the bidirectional electronic expansion valve EXV 1. A first ball valve BV1 is arranged between the throttling device and the dry filter 26, and a second ball valve BV2 is arranged between the dry filter 26 and the system liquid storage device 25.
In this embodiment, the wind speeds of the first fan 23 and the second fan 24 are adjustable, and both have three-gear wind speeds (high speed, medium speed, and low speed).
In this embodiment, the system reservoir 25 has a sight glass, and the refrigerant condition of the system reservoir 25 can be directly observed through the sight glass.
With reference to fig. 1 and fig. 2, the recovery compressor 4 of the refrigerant recovery system 10 is connected to the first end of the four-way reversing valve 9 through a fifth electromagnetic valve EV5, the exhaust pipe of the refrigerant recovery system 10 is also connected to the first end of the four-way reversing valve 9 through a second electromagnetic valve EV2, the suction pipe of the refrigerant recovery system 10 is connected to the second end of the four-way reversing valve 9 through a first electromagnetic valve EV1, the evaporator 21 of the machine under test system is connected to the third end of the four-way reversing valve 9, and the condenser 22 of the machine under test system is connected to the fourth end of the four-way reversing valve 9.
With reference to fig. 2, the system under test further includes a first filling opening AL1, a second filling opening AL2, and an evacuation opening EL1, where the first filling opening AL1 is connected to the system reservoir 25 through a first stop valve NV1, the second filling opening AL2 is connected to the suction pipe of the refrigerant recovery system 10 through a second stop valve NV2, and is connected to the exhaust pipe of the refrigerant recovery system 10 through a second stop valve NV2 and a third electromagnetic valve EV3, and the evacuation opening EL1 is connected to the suction pipe of the refrigerant recovery system 10 through a seventh electromagnetic valve EV7, and is connected to the exhaust pipe of the refrigerant recovery system 10 through a seventh electromagnetic valve EV7 and a third electromagnetic valve EV 3.
In this embodiment, the liquid can be added to the system reservoir 25 through the first liquid adding port AL1, the liquid is generally added in a liquid state at this time, the liquid is added to the refrigerant recovery system 10 through the second liquid adding port AL2, and the liquid is generally added in a gas state at this time.
In the refrigerant testing machine 100 provided in this embodiment, by using the refrigerant recovery system 10, the refrigerant in the compressor and the pipeline to be tested can be recovered completely, the machine does not need to be stopped frequently to supplement the amount of the refrigerant in the system, and the situation of environmental pollution caused by refrigerant leakage does not occur when the machine is dismounted. The method is particularly suitable for a compressor test system or an air conditioning system which adopts refrigerants with certain combustibility such as R32 and R290, and the flammable refrigerants cannot cause safety problems due to leakage. In addition, since the refrigerant passes through the oil separator 3 before entering the recovery compressor 4, oil in the refrigerant is separated and is not accumulated in the recovery compressor 4, and thus the failure rate of the recovery compressor 4 is reduced.
Please refer to fig. 3, which is a schematic structural diagram of a refrigerant recovery system according to another embodiment of the present invention. As shown in fig. 3, the refrigerant recovery system 20 of another embodiment further includes a recovery tank 7, and the recovery tank 7 is connected to the discharge port of the recovery compressor 4 through a fifth electromagnetic valve EV 5.
In this embodiment, the refrigerant recovery system is connected to a system accumulator connected to the refrigerant recovery system, and the refrigerant recovered by the recovery compressor 4 is delivered to the system accumulator through a pipeline. In another embodiment, the refrigerant recovery system 20 is not connected to a system accumulator, and the refrigerant recovered by the recovery compressor 4 is directly delivered to the recovery tank 7 through the fifth electromagnetic valve EV 5.
To sum up, the utility model discloses a refrigerant recovery system, compressor test device and air conditioning system through set up the oil separator between the sunction inlet at the recovery end of refrigerant and recovery compressor for oil in the refrigerant can not accumulate among the recovery compressor, reduce from this the fault rate of recovery compressor utilizes control system can further improve refrigerant recovery efficiency in addition, retrieves the refrigerant totally, and then avoids causing the problem of environmental pollution and potential safety hazard because of the refrigerant leaks.
The foregoing is a more detailed description of the present application in connection with specific preferred embodiments and it is not intended that the present application be limited to these specific details. For those skilled in the art to which the present application pertains, several simple deductions or substitutions may be made without departing from the concept of the present application, and all should be considered as belonging to the protection scope of the present application.
Claims (9)
1. A refrigerant recovery system, comprising: the device comprises a tested compressor, an air suction pipeline, an exhaust pipeline, a vacuum gauge, an oil separator, a recovery compressor and a control unit;
one end of each of the suction pipeline and the exhaust pipeline is connected with the tested compressor, the other end of each of the suction pipeline and the exhaust pipeline is connected to a recovery end, the recovery compressor is connected with the recovery end, the oil separator is arranged between a suction inlet and the recovery end of the recovery compressor, and the vacuum gauge is arranged in the suction pipeline;
the control unit comprises a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, a fourth electromagnetic valve and a fifth electromagnetic valve, the first electromagnetic valve is arranged between the air suction pipeline and an external evaporator, the second electromagnetic valve is arranged between the exhaust pipeline and an external condenser, the third electromagnetic valve is arranged between the air suction pipeline and the recovery end, the fourth electromagnetic valve is arranged between the recovery end and the oil separator, and one end of the fifth electromagnetic valve is connected with a discharge port of the recovery compressor.
2. The refrigerant recovery system as claimed in claim 1, wherein the control unit further includes a main control system, the first to fifth solenoid valves are all connected to the main control system, and the main control system is configured to control on and off of the first to fifth solenoid valves.
3. The refrigerant recovery system as set forth in claim 2, further comprising: a low voltage control and a high voltage control;
the low-pressure control device is arranged in the air suction pipeline and used for detecting whether the pressure of the air suction pipeline exceeds a set lower limit or not and sending a signal to the main control system;
the high-pressure control device is arranged in the exhaust pipeline and used for detecting whether the pressure of the exhaust pipeline exceeds a set upper limit or not and sending a signal to the main control system.
4. The refrigerant recovery system as set forth in claim 1, further comprising: a first sensing unit and a second sensing unit;
the first sensing unit comprises a first temperature sensor and a first pressure sensor, and the first temperature sensor and the first pressure sensor are both arranged in the air suction pipeline and are used for respectively sensing the temperature and the pressure of the air suction pipeline;
the second sensing unit comprises a second temperature sensor and a second pressure sensor, and the second temperature sensor and the second pressure sensor are both arranged in the exhaust pipeline and used for respectively sensing the temperature and the pressure of the exhaust pipeline.
5. The refrigerant recovery system as set forth in claim 1, further comprising: an air suction hose and an air discharge hose;
the pressure-measured compressor is connected with the air suction pipeline through the air suction hose, and the pressure-measured compressor is connected with the air exhaust pipeline through the air exhaust hose.
6. The refrigerant recovery system as claimed in claim 1, wherein the other end of the fifth solenoid valve is connected to the condenser, and the oil separator is provided with an oil drain valve.
7. The refrigerant recovery system as claimed in claim 1, further comprising a recovery tank connected to a discharge port of the recovery compressor through the other end of the fifth solenoid valve.
8. A compressor test apparatus, comprising: the refrigerant recovery system as claimed in any one of claims 1 to 7.
9. An air conditioning system, comprising: the refrigerant recovery system as claimed in any one of claims 1 to 7.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113007932A (en) * | 2021-03-18 | 2021-06-22 | 珠海格力电器股份有限公司 | Refrigerant adjusting device, refrigerant recovery equipment and control method of refrigerant recovery equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113007932A (en) * | 2021-03-18 | 2021-06-22 | 珠海格力电器股份有限公司 | Refrigerant adjusting device, refrigerant recovery equipment and control method of refrigerant recovery equipment |
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