A compressor test system

Abstract

The present disclosure provides a compressor test system, comprising: a condenser, an evaporator, and a first throttling device. The condenser can be connected to the exhaust port of the compressor, and the outlet of the condenser can be connected to the inlet of the evaporator. The compressor is an R507 screw parallel compressor, where R507 is the refrigerant, that is, the compressor is a screw parallel compressor using R507 as the refrigerant for the refrigeration cycle. The first throttling device is arranged between the outlet of the condenser and the inlet of the evaporator, and the outlet of the evaporator can be connected to the suction port of the compressor. According to the present disclosure, the performance of the compressor can be accurately tested, thereby ensuring the normal operation of the compressor unit and enabling the effective application of the R507 refrigerant. This system is transformed based on the traditional chilled water unit test experimental system, saving the construction cost and maintenance cost of the large-scale test experimental system. The test transformation tooling has a simple structure, easy control, and strong reliability.

Description

Technical Field

[0001] The present disclosure relates to the technical field of compressors, and particularly to a compressor test system. Background Art

[0002] With the booming development of the national cold chain system and industrial refrigeration, more and more equipment manufacturers have increased their R & D and production investment in refrigeration and cold storage equipment. At present, large and medium-sized refrigeration equipment uses R22 refrigerant. Especially for screw parallel compressor units, a test and experimental system for R22 is constructed accordingly. Due to environmental protection reasons, R22 refrigerant is gradually phased out. Therefore, some environmental protection and green projects adopt refrigeration and cold storage equipment using R507A refrigerant. The investment in the test and experimental system for large and medium-sized refrigeration equipment is huge, and the R507A refrigerant system is incompatible with the R22 refrigerant system. Therefore, the R507A screw parallel compressor unit is transformed using the traditional chiller test and experimental system.

[0003] Due to the technical problems in the existing compressors that the R507A refrigerant system is incompatible with the R22 refrigerant system, the R507 screw parallel compressor unit cannot be tested to ensure the normal operation of the compressor unit, resulting in the ineffective application of R507A, etc. Therefore, the present disclosure researches and designs a compressor test system.

[0004] Disclosed content

[0005] Therefore, the technical problem to be solved by the present disclosure is to overcome the defect that the existing compressor cannot test the R507 screw parallel compressor unit to ensure the normal operation of the compressor unit, resulting in the ineffective application of R507A, so as to provide a compressor test system.

[0006] To solve the above problems, the present disclosure provides a compressor test system, which includes:

[0007] A condenser, an evaporator and a first throttling device. The condenser can be connected to the exhaust port of the compressor. The compressor is an R507 screw parallel compressor, where R507 is the refrigerant, that is, the compressor is a screw parallel compressor using R507 as the refrigerant for refrigeration cycle. The outlet of the condenser can be connected to the inlet of the evaporator. The first throttling device is arranged between the outlet of the condenser and the inlet of the evaporator. The outlet of the evaporator can be connected to the suction port of the compressor.

[0008] In some embodiments, it further includes a first secondary refrigerant inlet pipe and a first secondary refrigerant outlet pipe. One end of the first secondary refrigerant inlet pipe is connected to the first secondary refrigerant, and the other end is led into the evaporator to exchange heat with the refrigerant in the evaporator. One end of the first secondary refrigerant outlet pipe is in communication with the interior of the evaporator to lead out the first secondary refrigerant.

[0009] In some embodiments, it further includes a second secondary refrigerant inlet pipe and a second secondary refrigerant outlet pipe. One end of the second secondary refrigerant inlet pipe is connected to the second secondary refrigerant, and the other end is led into the condenser to exchange heat with the refrigerant in the condenser. One end of the second secondary refrigerant outlet pipe is in communication with the interior of the condenser to lead out the second secondary refrigerant.

[0010] In some embodiments, it further includes a first refrigerant pipeline. One end of the first refrigerant pipeline can be connected to the inlet of the condenser, and the other end can be connected to the exhaust port of the compressor;

[0011] It further includes a second refrigerant pipeline and a third refrigerant pipeline. One end of the second refrigerant pipeline can be connected to the outlet of the condenser, and one end of the third refrigerant pipeline can be connected to the inlet of the evaporator; a first throttling device is arranged on the third refrigerant pipeline;

[0012] It further includes a fourth refrigerant pipeline. One end of the fourth refrigerant pipeline can be connected to the outlet of the evaporator, and one end of the fourth refrigerant pipeline can be connected to the inlet of the compressor.

[0013] In some embodiments, it further includes a fifth refrigerant pipeline. One end of the fifth refrigerant pipeline is in communication with the interior of the condenser, and the other end can also be connected to the inlet of the compressor;

[0014] It further includes a gas collector. The other end of the fourth refrigerant pipeline is connected to the interior of the gas collector, and the other end of the fifth refrigerant pipeline is also connected to the interior of the gas collector to exchange heat inside the gas collector. The gas collector is connected to the inlet of the compressor through a sixth refrigerant pipeline.

[0015] In some embodiments, it further includes a second throttling device, and the second throttling device is arranged on the fourth refrigerant pipeline; and / or, a suction liquid injection valve is further arranged on the fifth refrigerant pipeline.

[0016] In some embodiments, it further includes an oil separator and a seventh refrigerant pipeline. The oil separator is arranged between the exhaust port of the compressor and the condenser. One end of the seventh refrigerant pipeline is connected to the exhaust port of the compressor, and the other end is connected to the inlet of the oil separator. The outlet of the oil separator (6) can be connected to the first refrigerant pipeline.

[0017] In some embodiments, the oil cooler, an eighth refrigerant pipeline, a ninth refrigerant pipeline, a third brine inlet pipe and a third brine outlet pipe are further included, one end of the eighth refrigerant pipeline is connected to the interior of the oil separator and can absorb oil from the interior of the oil separator, the other end of the eighth refrigerant pipeline is connected to the first inlet of the oil cooler, the first outlet of the oil cooler can be connected to the first inlet, and the oil is discharged through the ninth refrigerant pipeline;

[0018] One end of the third coolant inlet pipe introduces the third coolant, and the other end is connected to the second inlet of the oil cooler. The second outlet of the oil cooler can be connected to the second inlet and the third coolant is discharged through the third coolant outlet pipe.

[0019] In some embodiments, a liquid reservoir is further included, the liquid reservoir is connected between the outlet of the condenser and the inlet of the evaporator, and the other end of the second refrigerant pipeline is connected to the interior of the liquid reservoir.

[0020] In some embodiments, an economizer and a tenth refrigerant pipeline are also included, wherein the inlet of the economizer is connected to an inlet pipeline, the gas outlet of the economizer is connected to a gas pipeline, and the liquid outlet of the economizer is connected to a liquid pipeline, one end of the tenth refrigerant pipeline is connected to the outlet of the liquid reservoir, and the other end is connected to the inlet pipeline, the gas pipeline can be connected to the air supply port of the compressor, and the liquid pipeline is connected to the third refrigerant pipeline.

[0021] The compressor testing system provided by the present disclosure has the following beneficial effects:

[0022] 1. The present invention connects the compressor (especially the R507 screw parallel compressor) into the refrigeration cycle system through the condenser, the evaporator and the first throttling device and the corresponding pipeline connection method, and can accurately test the performance of the compressor, thereby ensuring that the compressor unit can operate normally and the R507 refrigerant can be effectively used. The system is modified on the basis of the traditional chiller test experimental system, saving the construction cost and maintenance cost of the large-scale test experimental system. The test modification tooling has a simple structure, simple control and strong reliability.

[0023] 2. The present disclosure can also effectively and precisely adjust the suction temperature before the compressor suction port through the second throttling device, the fifth refrigerant pipeline, and the gas collector tank, forming a suction temperature control system. From the liquid extraction port of the tooling condenser, it is connected to the suction liquid injection port of the unit gas collector tank through the suction liquid injection valve to control the suction superheat of the unit, so that the suction superheat of the compressor will not be too high. The present disclosure passes through an oil cooling system (including an oil cooler, a third coolant inlet pipe, and a third coolant outlet pipe). The cold source side of the unit oil cooler is directly connected to the heat recovery water circulation system of the chiller test bench. The heat recovery water inlet is connected to the oil cooling inlet of the oil cooler, and the heat recovery water outlet is connected to the oil cooling outlet of the oil cooler, which can precisely and effectively adjust the oil temperature and accurately control the oil return temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is the system structure diagram of the compressor test system of the present disclosure;

[0025] Figure 2 is the physical structure diagram of the compressor test system of the present disclosure.

[0026] The reference numerals are shown as:

[0027] 1. Compressor; 2. Condenser; 3. Evaporator; 41. First throttling device; 42. Second throttling device; 43. Suction liquid injection valve; 5. Gas collector tank; 6. Oil separator; 7. Oil cooler; 8. Liquid storage tank; 9. Economizer; 101. First refrigerant pipeline; 102. Second refrigerant pipeline; 103. Third refrigerant pipeline; 104. Fourth refrigerant pipeline; 105. Fifth refrigerant pipeline; 106. Sixth refrigerant pipeline; 107. Seventh refrigerant pipeline; 108. Eighth refrigerant pipeline; 109. Ninth refrigerant pipeline; 110. Tenth refrigerant pipeline; 111. Inlet pipeline; 112. Gas pipeline; 113. Liquid pipeline; 201. First coolant inlet pipe; 202. First coolant outlet pipe; 301. Second coolant inlet pipe; 302. Second coolant outlet pipe; 401. Third coolant inlet pipe; 402. Third coolant outlet pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] As Figure 1-2 shown, the present disclosure provides a compressor test system, which includes:

[0029] A condenser 2, an evaporator 3, and a first throttling device 41. The condenser 2 can be connected to the exhaust port of a compressor 1 (preferably a screw compressor), where the compressor 1 is an R507 screw parallel compressor, and where R507 is a refrigerant, that is, the compressor is a screw parallel compressor using R507 as the refrigerant for the refrigeration cycle. The outlet of the condenser 2 can be connected to the inlet of the evaporator 3. The first throttling device 41 is arranged between the outlet of the condenser 2 and the inlet of the evaporator 3. The outlet of the evaporator 3 can be connected to the suction port of the compressor 1.

[0030] R507 is a mixture of R125 (pentafluoroethane) and R143 (trifluoroethane), that is, an azeotropic agent, and is a long-term substitute for R-502 refrigerant (HFC substance), with an ODP value of zero and containing no ozone-depleting substances. Since the refrigerating capacity and efficiency of R507 refrigerant are very close to those of R502, and it has excellent heat transfer performance and low toxicity, R507 is more suitable for applications in the medium and low temperature refrigeration field than any other known substitute for R-502.

[0031] Like R404A, R507 is an environmentally friendly refrigerant used to replace R502, but R507 can usually reach lower temperatures than R404A. R507 is applicable to new commercial refrigeration equipment (supermarket freezers and refrigerators, cold storages, display cabinets, transportation) for medium and low temperatures, ice-making equipment, transportation refrigeration equipment, marine refrigeration equipment, or retrofit equipment, and is applicable to all environments where R502 can operate normally.

[0032] Through the condenser, evaporator, first throttling device, and the corresponding pipeline connection method, the present disclosure enables a compressor (especially an R507 screw parallel compressor) to be connected into the refrigeration cycle system, so as to accurately test the performance of the compressor, thereby ensuring the normal operation of the compressor unit and enabling the effective application of R507 refrigerant. This system is modified based on the traditional chilled water unit test experimental system, saving the construction cost and maintenance cost of a large test experimental system. The test retrofit tooling has a simple structure, easy control, and strong reliability.

[0033] In some embodiments, it further includes a first secondary refrigerant inlet pipe 201 and a first secondary refrigerant outlet pipe 202. One end of the first secondary refrigerant inlet pipe 201 is connected to a first secondary refrigerant, and the other end is led into the evaporator 3 to exchange heat with the refrigerant in the evaporator 3. One end of the first secondary refrigerant outlet pipe 202 is internally connected to the evaporator 3 to lead out the first secondary refrigerant. This is a further preferred structural form of the present disclosure. Through the first secondary refrigerant inlet pipe, a first secondary refrigerant (preferably water) can be introduced from the outside into the evaporator to exchange heat with the refrigerant. The water is cooled by absorbing heat and is discharged from the first secondary refrigerant outlet pipe, completing the effective evaporation and heat absorption effect of the refrigerant in the evaporator.

[0034] In some embodiments, a second secondary refrigerant inlet pipe 301 and a second secondary refrigerant outlet pipe 302 are further included. One end of the second secondary refrigerant inlet pipe 301 is connected to the second secondary refrigerant, and the other end is led into the condenser 2 to exchange heat with the refrigerant in the condenser 2. One end of the second secondary refrigerant outlet pipe 302 is in internal communication with the condenser 2 to lead out the second secondary refrigerant. This is a further preferred structural form of the present disclosure. Through the second secondary refrigerant inlet pipe, a second secondary refrigerant (preferably water) can be introduced from the outside and enter the condenser to exchange heat with the refrigerant. The water is heated by releasing heat and is discharged from the second secondary refrigerant outlet pipe, completing the effective condensation heat release effect of the refrigerant in the condenser.

[0035] In some embodiments, a first refrigerant pipeline 101 is further included. One end of the first refrigerant pipeline 101 can be connected to the inlet of the condenser 2, and the other end can be connected to the exhaust port of the compressor.

[0036] A second refrigerant pipeline 102 and a third refrigerant pipeline 103 are further included. One end of the second refrigerant pipeline 102 can be connected to the outlet of the condenser 2, and one end of the third refrigerant pipeline 103 can be connected to the inlet of the evaporator 3; a first throttling device 41 is arranged on the third refrigerant pipeline 103.

[0037] A fourth refrigerant pipeline 104 is further included. One end of the fourth refrigerant pipeline 104 can be connected to the outlet of the evaporator 3, and one end of the fourth refrigerant pipeline 104 can be connected to the intake port of the compressor 1.

[0038] This is the preferred pipeline and its connection method in the compressor test system of the present disclosure. Through the first refrigerant pipeline, the compressor exhaust can be connected and led into the condenser. Through the second refrigerant pipeline, the refrigerant at the outlet of the condenser can be led out. Through the third refrigerant pipeline, the refrigerant after condensation heat release can be led into the evaporator, and the first throttling device is arranged on the third refrigerant pipeline to throttle and depressurize the refrigerant; through the fourth refrigerant pipeline, the refrigerant after evaporation heat absorption in the evaporator can be led out and finally led back to the intake port of the compressor to complete the refrigeration cycle.

[0039] In some embodiments, a fifth refrigerant pipeline 105 is further included. One end of the fifth refrigerant pipeline 105 is in internal communication with the condenser 2, and the other end can also be connected to the intake port of the compressor 1.

[0040] It further includes a gas collector 5. The other end of the fourth refrigerant pipeline 104 communicates with the interior of the gas collector 5, and the other end of the fifth refrigerant pipeline 105 also communicates with the interior of the gas collector 5 to perform heat exchange inside the gas collector 5. The gas collector 5 is communicated with the intake port of the compressor 1 through a sixth refrigerant pipeline 106.

[0041] Through the setting of the fifth refrigerant pipeline and the gas collector, the present disclosure can effectively and precisely adjust the suction temperature before the refrigerant enters the suction port of the compressor (the refrigerant led out from the condenser can heat the suction refrigerant to avoid the situation of liquid carry - over in suction due to too low suction temperature), forming a suction temperature control system. The liquid extraction port of the tooling condenser is connected to the suction liquid injection port of the unit gas collector through the suction liquid injection valve to control the suction superheat degree of the unit, so that the suction superheat degree of the compressor will not be too low.

[0042] In some embodiments, it further includes a second throttling device 42, and the second throttling device 42 is arranged on the fourth refrigerant pipeline 104; and / or, a suction liquid injection valve 43 is also arranged on the fifth refrigerant pipeline 105.

[0043] Through the setting of the second throttling device, the present disclosure can perform a secondary throttling and pressure - reducing effect on the refrigerant before it enters the suction port of the compressor, reduce the suction temperature, effectively and precisely adjust the suction temperature, and avoid the situation that the volumetric compressor has a low density of the suction refrigerant and a small main flow rate due to too high suction temperature, forming a suction temperature control system, so that the suction superheat degree of the compressor will not be too high. Since the screw compressor needs to avoid liquid carry - over in suction causing liquid hammer or oil bleeding, and at the same time avoid too high suction temperature resulting in low density of the suction refrigerant and small main flow rate of the volumetric compressor, according to relevant standards, the suction superheat degree should be controlled at 10°C.

[0044] The outlet of the evaporator of the tooling of the present disclosure is connected to the suction port of the unit through a secondary throttling valve (i.e., the second throttling device). The compressor sucks in low - pressure gaseous refrigerant. The unit discharges high - temperature and high - pressure gaseous refrigerant through the exhaust port of the oil separator. The exhaust port of the unit is connected to the intake port of the tooling condenser through a check valve to discharge the high - temperature and high - pressure gaseous refrigerant into the condenser. After being cooled into high - pressure liquid refrigerant through the cooling water circulation system of the chiller test bench, it enters the liquid - dropping port of the liquid receiver of the unit through the liquid outlet of the condenser. After the high - pressure liquid refrigerant is sub - cooled by the economizer of the unit, it is discharged from the liquid supply port, throttled into low - pressure gas - liquid two - phase refrigerant through the electronic expansion valve, then enters the evaporator, evaporates into low - pressure gaseous refrigerant through the coolant circulation system of the chiller test bench, is discharged from the outlet, and is connected to the suction port of the unit gas collector through the secondary throttling valve to complete the main refrigerant circulation system of the refrigeration equipment.

[0045] There are also two auxiliary control devices: one is the suction temperature control system, which is connected from the liquid extraction port of the tooling condenser to the suction liquid injection port of the unit gas collector through the suction liquid injection valve to control the suction superheat of the unit. The other is the oil cooling system. The cold source side of the unit oil cooler is directly connected to the heat recovery water circulation system of the chiller test bench. The heat recovery water inlet is connected to the oil cooling inlet of the oil cooler, and the heat recovery water outlet is connected to the oil cooling outlet of the oil cooler.

[0046] In some embodiments, an oil separator 6 and a seventh refrigerant pipeline 107 are further included. The oil separator 6 is arranged between the exhaust port of the compressor 1 and the condenser 2. One end of the seventh refrigerant pipeline 107 communicates with the exhaust port of the compressor 1, and the other end communicates with the inlet of the oil separator 6. The outlet of the oil separator 6 can communicate with the first refrigerant pipeline 101. The present disclosure can effectively separate oil from the compressor exhaust through the oil separator and the seventh refrigerant pipeline, and guide the entrained oil back to the compressor to ensure that there is enough lubricating oil in the compressor to play a lubricating and cooling role.

[0047] In some embodiments, an oil cooler 7, an eighth refrigerant pipeline 108, a ninth refrigerant pipeline 109, a third coolant inlet pipe 401 and a third coolant outlet pipe 402 are further included. One end of the eighth refrigerant pipeline 108 communicates with the inside of the oil separator 6 and can suck oil from the inside of the oil separator 6. The other end of the eighth refrigerant pipeline 108 communicates with the first inlet of the oil cooler 7. The first outlet of the oil cooler 7 can communicate with the first inlet and export the oil through the ninth refrigerant pipeline 109;

[0048] One end of the third coolant inlet pipe 401 introduces the third coolant, and the other end communicates with the second inlet of the oil cooler 7. The second outlet of the oil cooler 7 can communicate with the second inlet and export the third coolant through the third coolant outlet pipe 402.

[0049] Through the oil cooling system (including the oil cooler, the third coolant inlet pipe and the third coolant outlet pipe) of the present disclosure, the cold source side of the unit oil cooler is directly connected to the heat recovery water circulation system of the chiller test bench. The heat recovery water inlet is connected to the oil cooling inlet of the oil cooler, and the heat recovery water outlet is connected to the oil cooling outlet of the oil cooler, which can accurately and effectively adjust the oil temperature and accurately control the oil return temperature.

[0050] In some embodiments, a liquid receiver 8 is further included. The liquid receiver 8 is connected between the outlet of the condenser 2 and the inlet of the evaporator 3. The other end of the second refrigerant pipeline 102 communicates with the inside of the liquid receiver 8. The present disclosure can store the refrigerant at the outlet of the condenser through the liquid receiver and perform the function of gas-liquid separation.

[0051] In some embodiments, an economizer 9 and a tenth refrigerant pipeline 110 are further included. The inlet of the economizer 9 is connected to an inlet pipeline 111, the gas outlet of the economizer 9 is connected to a gas pipeline 112, and the liquid outlet of the economizer 9 is connected to a liquid pipeline 113. One end of the tenth refrigerant pipeline 110 is connected to the outlet of the accumulator 8, and the other end is connected to the inlet pipeline 111. The gas pipeline 112 can be connected to the gas supplement port of the compressor 1, and the liquid pipeline 113 is connected to the third refrigerant pipeline 103. Through the arrangement of the economizer and the tenth refrigerant pipeline, the present disclosure can make the refrigerant at the outlet of the accumulator enter and flash in the economizer, supplement the gas formed by flashing to the compressor through the gas pipeline, and the formed liquid further enters the evaporator to complete the process of evaporation and heat absorption, forming the function and effect of gas injection and enthalpy increase.

[0052] After the R507A screw parallel compressor unit of the present disclosure is connected to the transformation tooling, vacuum pumping, pressure holding, and leak detection tests are carried out, and the refrigerant and refrigeration oil are matched after operation.

[0053] For the R507A screw parallel compressor unit test tooling, it is necessary to control the suction pressure, discharge pressure, suction temperature, and subcooling degree of the screw parallel compressor unit.

[0054] The suction pressure is roughly adjusted through the tooling electronic expansion valve and the secondary refrigerant circulation system, and finely adjusted through the secondary throttle valve. The secondary refrigerant flow rate is controlled according to (= nominal refrigeration capacity / secondary refrigerant density / secondary refrigerant specific heat capacity / secondary refrigerant inlet and outlet temperature difference), and the secondary refrigerant outlet temperature is controlled according to the saturation temperature corresponding to the suction pressure minus 5°C.

[0055] The discharge pressure is regulated through the cooling water circulation system. The cooling water flow rate is controlled according to (= (nominal refrigeration capacity + power - oil cooling heat)) / cooling water density / cooling water specific heat capacity / cooling water inlet and outlet temperature difference), and the cooling water inlet temperature is preset according to the saturation temperature corresponding to the discharge pressure minus 7°C, and then finely adjusted according to the discharge pressure.

[0056] Since the standard subcooling degree requirement is 0, a condenser without a subcooling section is used in this tooling.

[0057] The suction temperature is adjusted by trial through the suction liquid injection valve and the secondary throttle valve of the suction temperature regulation system.

[0058] The oil cooling system is regulated through the heat recovery water circulation system of the chiller test bench. The heat recovery water flow rate is controlled according to (= oil cooling heat / heat recovery water density / heat recovery water specific heat capacity / heat recovery water inlet and outlet temperature difference), and the heat recovery water inlet temperature is controlled according to the cooling water inlet temperature.

[0059] The R507A screw parallel compressor unit can directly use the chiller test bench through the test modification tooling, and the liquid secondary refrigerant method is used for test determination and calculation of the refrigerating capacity, and the heat balance method is used for verification.

[0060] The R507A screw parallel compressor unit saves a set of dedicated R507A test benches through the test modification tooling.

[0061] The above are only the preferred embodiments of the present disclosure, and are not intended to limit the present disclosure. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present disclosure shall be included within the protection scope of the present disclosure. The above is only the preferred implementation manner of the present disclosure. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present disclosure, several improvements and modifications can still be made, and these improvements and modifications should also be regarded as the protection scope of the present disclosure.

Claims

1. A compressor test system, characterized in that: Comprising: A condenser (2), an evaporator (3), and a first throttling device (41). The condenser (2) can be connected to the exhaust port of a compressor (1), where the compressor (1) is a parallel screw compressor using R507. Here, R507 is the refrigerant, that is, the compressor is a parallel screw compressor using R507 as the refrigerant for the refrigeration cycle. The outlet of the condenser (2) can be connected to the inlet of the evaporator (3). The first throttling device (41) is arranged between the outlet of the condenser (2) and the inlet of the evaporator (3). The outlet of the evaporator (3) can be connected to the suction port of the compressor (1); It further includes a first refrigerant pipeline (101), one end of the first refrigerant pipeline (101) can be connected to the inlet of the condenser (2), and the other end can be connected to the exhaust port of the compressor; It further includes a second refrigerant pipeline (102) and a third refrigerant pipeline (103). One end of the second refrigerant pipeline (102) can be connected to the outlet of the condenser (2), and one end of the third refrigerant pipeline (103) can be connected to the inlet of the evaporator (3). The first throttling device (41) is arranged on the third refrigerant pipeline (103); It further includes a fourth refrigerant pipeline (104), one end of the fourth refrigerant pipeline (104) can be connected to the outlet of the evaporator (3), and one end of the fourth refrigerant pipeline (104) can be connected to the intake port of the compressor (1); It further includes a fifth refrigerant pipeline (105), one end of the fifth refrigerant pipeline (105) is internally connected to the condenser (2), and the other end can also be connected to the intake port of the compressor (1); It further includes a gas collector (5). The other end of the fourth refrigerant pipeline (104) is connected to the inside of the gas collector (5), and the other end of the fifth refrigerant pipeline (105) is also connected to the inside of the gas collector (5) for heat exchange inside the gas collector (5). The gas collector (5) is connected to the intake port of the compressor (1) through a sixth refrigerant pipeline (106); It further includes a liquid receiver (8). The liquid receiver (8) is connected between the outlet of the condenser (2) and the inlet of the evaporator (3), and the other end of the second refrigerant pipeline (102) is connected to the inside of the liquid receiver (8).

2. The compressor test system according to claim 1, characterized in that: It further includes a first coolant inlet pipe (201) and a first coolant outlet pipe (202). One end of the first coolant inlet pipe (201) is connected to the first coolant, and the other end is introduced into the evaporator (3) to exchange heat with the refrigerant in the evaporator (3). One end of the first coolant outlet pipe (202) is internally connected to the evaporator (3) to export the first coolant.

3. The compressor test system according to claim 1, characterized in that: It further includes a second secondary refrigerant inlet pipe (301) and a second secondary refrigerant outlet pipe (302). One end of the second secondary refrigerant inlet pipe (301) is connected to the second secondary refrigerant, and the other end is led into the condenser (2) to exchange heat with the refrigerant in the condenser (2). One end of the second secondary refrigerant outlet pipe (302) is internally connected to the condenser (2) to lead out the second secondary refrigerant.

4. The compressor testing system according to claim 1, characterized in that: It further includes a second throttling device (42) provided on the fourth refrigerant pipeline (104); and / or, a suction liquid injection valve (43) is further provided on the fifth refrigerant pipeline (105).

5. The compressor testing system according to claim 1, characterized in that: It further includes an oil separator (6) and a seventh refrigerant pipeline (107). The oil separator (6) is arranged between the exhaust port of the compressor (1) and the condenser (2). One end of the seventh refrigerant pipeline (107) is communicated with the exhaust port of the compressor (1), and the other end is communicated with the inlet of the oil separator (6). The outlet of the oil separator (6) can be communicated with the first refrigerant pipeline (101).

6. The compressor testing system according to claim 5, characterized in that: It further includes an oil cooler (7), an eighth refrigerant pipeline (108), a ninth refrigerant pipeline (109), a third secondary refrigerant inlet pipe (401) and a third secondary refrigerant outlet pipe (402). One end of the eighth refrigerant pipeline (108) is internally connected to the oil separator (6) and can suck oil from the inside of the oil separator (6). The other end of the eighth refrigerant pipeline (108) is communicated with the first inlet of the oil cooler (7). The first outlet of the oil cooler (7) can be communicated with the first inlet and lead out the oil through the ninth refrigerant pipeline (109); One end of the third secondary refrigerant inlet pipe (401) introduces the third secondary refrigerant, and the other end is communicated with the second inlet of the oil cooler (7). The second outlet of the oil cooler (7) can be communicated with the second inlet and lead out the third secondary refrigerant through the third secondary refrigerant outlet pipe (402).

7. The compressor testing system according to claim 1, characterized in that: It further includes an economizer (9) and a tenth refrigerant pipeline (110). The inlet of the economizer (9) is communicated with an inlet pipeline (111), the gas outlet of the economizer (9) is communicated with a gas pipeline (112), and the liquid outlet of the economizer (9) is communicated with a liquid pipeline (113). One end of the tenth refrigerant pipeline (110) is communicated with the outlet of the accumulator (8), and the other end is communicated with the inlet pipeline (111). The gas pipeline (112) can be communicated with the gas replenishing port of the compressor (1), and the liquid pipeline (113) is communicated with the third refrigerant pipeline (103).

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