CO2 air conditioner heat exchanger performance test system

Abstract

The utility model discloses a CO2 air conditioner heat exchanger performance test system which comprises a compressor, an auxiliary condenser, a flowmeter, first to fourteenth regulating valves, an auxiliary evaporator, a gas-liquid separator, a calorimeter, a superheater and a flash tank. And a test loop with different CO2 condenser test modes and CO2 evaporator test modes is formed through the opening and closing combination of the regulating valves. According to the utility model, the flash tank and the liquid path regulating valve between the flash tank and the auxiliary evaporator are added for secondary throttling to replace the compressor to control the suction pressure of the compressor / the refrigerant flow of the system in a frequency conversion manner, the control coupling is smaller than that in the prior art, and the control stability is better; a gas path adjusting valve from the flash tank to the auxiliary evaporator outlet is added to adjust the middle pressure and adjust the liquid storage amount, so that the charging and discharging of a refrigerant can be avoided or reduced when experiments under different working conditions are carried out; by additionally arranging the gas storage tank, equipment damage caused by CO2 overpressure in the system can be avoided when the environment temperature is too high, and the problem that part of refrigerants need to be discharged in summer is solved.

Description

Technical Field

[0001] The utility model relates to the field of air conditioning, in particular to a test system for an air conditioning heat exchanger using CO2 as a refrigerant. Background Art

[0002] Compared with traditional refrigerants, CO2 has obvious advantages in terms of environmental protection, non-toxicity, economy and unit volume cooling capacity. As long as the pressure resistance of the air-conditioning system is reasonably designed, the safety and reliability of the CO2 refrigerant system under transcritical pressure can be guaranteed, and the performance of the heat exchanger can be improved, and the cycle efficiency of the system can be improved. As one of the environmentally friendly refrigerants, CO2 has a good application prospect and will be widely used with the development of refrigeration and air-conditioning technology.

[0003] Since the CO2 refrigeration system is affected by many factors such as temperature fluctuations, start-stop cycles, and heat pump defrosting during actual operation, its internal pressure is in frequent alternation. Therefore, in order to meet the testing requirements for heat exchangers used in CO2 air-conditioning systems, there is an urgent need for safe and reliable testing equipment to perform performance tests on such heat exchangers.

[0004] Chinese patent 201810971944.1 discloses a CO2 air conditioning heat exchanger performance test system including: a compressor, an auxiliary condenser, a flow meter, the first to eleventh regulating valves, an auxiliary evaporator, a gas-liquid separator, a calorimeter, a superheater, and the first to fifth temperature and pressure measuring points; the opening and closing combination of the regulating valve forms a test loop with different CO2 condenser test mode and CO2 evaporator test mode. This scheme can control the working state of each component in the test system, so that the temperature and pressure at the high-pressure and low-pressure inlet and outlet of the CO2 heat exchanger under test, as well as the flow through the CO2 heat exchanger under test, can always be kept under the test conditions, thereby accurately monitoring whether the performance of the CO2 heat exchanger under test meets the requirements; the test conditions and test objects can be switched by setting and switching the valves and changing the positions of the measuring points, and the flow direction of the refrigerant in the pipeline can be changed as needed without increasing the hardware cost, so as to realize the function of testing the CO2 air conditioning heat exchanger.

[0005] However, the above CO2 air conditioning heat exchanger performance test system has the following technical problems to be solved:

[0006] 1. When the experimental working conditions change too much, it may be necessary to charge and discharge the refrigerant during the experiment. In summer, the refrigerant pressure in the system will exceed the limit, and the refrigerant will need to be released to reduce the pressure. The system does not have the ability to adjust the refrigerant injection amount, and the refrigerant pressure will exceed the limit.

[0007] 2. Since the high-pressure condensation of CO2 does not involve phase change heat transfer, the condensation pressure needs to be controlled by the second regulating valve 5, and the refrigerant flow is controlled by the compressor frequency conversion. Although the control coupling of the entire system is strong, the stability is poor. Utility Model Content

[0008] The technical problem to be solved by the utility model is to provide an improvement plan for the existing technology, provide a refrigerant adjustment function when the working conditions change greatly and the temperature is high in summer, and at the same time solve the CO2 air-conditioning heat exchanger performance test system with poor system stability caused by the compressor variable frequency control.

[0009] In order to solve the above technical problems, the CO2 air conditioning heat exchanger performance test system provided by the utility model includes: a compressor 1, an auxiliary condenser 2, a flow meter 3, first to eleventh regulating valves 4 to 14, an auxiliary evaporator 15, a gas-liquid separator 16, a calorimeter 17, a superheater 18, and first to fifth temperature and pressure measuring points 19-23;

[0010] The compressor 1 is respectively connected to the auxiliary condenser 2, the gas-liquid separator 16, the calorimeter 17 and the first end of the superheater 18, the second end of the auxiliary condenser 2 is respectively connected to the flow meter 3, the auxiliary evaporator 15 and the first end of the heat exchanger A under test, the second end of the auxiliary evaporator 15 is connected to the second end of the gas-liquid separator 16, the first end of the heat exchanger A under test is respectively connected to the first end of the auxiliary evaporator 15 and the second end of the flow meter 3, and the second end of the heat exchanger A under test is respectively connected to the second end of the calorimeter 17 and the second end of the superheater 18;

[0011] The first regulating valve 4 is arranged on the pipeline between the second end of the auxiliary condenser 2 and the first end of the flow meter 3, the second regulating valve 5 and the third regulating valve 6 are connected in parallel on the pipeline between the second end of the auxiliary condenser 2 and the first end of the auxiliary evaporator 15, the fourth regulating valve 7 and the fifth regulating valve 8 are connected in parallel and then connected in series with the sixth regulating valve 9 between the second end of the flow meter 3 and the first end of the heat exchanger A under test, the seventh regulating valve 10 and the sixth regulating valve 9 are connected in series between the first end of the auxiliary evaporator 15 and the first end of the heat exchanger A under test, the first regulating valve 4 and the eighth regulating valve 11 are connected in series between the second end of the auxiliary condenser 2 and the first end of the heat exchanger A under test, the ninth regulating valve 12 is arranged between the first end of the compressor 1 and the first end of the calorimeter 17, the tenth regulating valve 13 is arranged between the second end of the calorimeter 17 and the second end of the heat exchanger A under test, and the eleventh regulating valve 14 is arranged between the second end of the superheater 18 and the second end of the heat exchanger A under test;

[0012] Wherein, compressor 1 is a non-stepless variable frequency compressor, that is, not a stepless variable frequency compressor, and further includes:

[0013] A flasher 38, a first end of which is connected to the junction of the second regulating valve 5, the third regulating valve 6 and the seventh regulating valve 10, and a second end of which is connected to the first end of the auxiliary evaporator 15, which is used to adjust the pressure of the first point 22 (measuring the pressure of the compressor suction point), and then adjust the refrigerant flow, replacing the compressor to achieve stepless frequency conversion control;

[0014] The twelfth regulating valve 35 and the thirteenth regulating valve 36 are connected in parallel between the flasher 38 and the auxiliary evaporator 15; they are used to adjust the pressure of the first point 22 during the evaporator and condenser test process, and then adjust the refrigerant flow, replacing the compressor variable frequency control of the prior art; that is, the compressor variable frequency control of the prior art is changed into a step-by-step control to provide high stability;

[0015] The fourteenth regulating valve 37 is connected between the second end of the flash device 38 and the second end of the auxiliary evaporator 15, and is used to adjust the pressure of the second point 40 (intermediate pressure).

[0016] Preferably, the CO2 air conditioning heat exchanger performance test system is further improved, further comprising:

[0017] The air storage tank 39 is arranged on the air suction end pipeline of the compressor 1.

[0018] The volume of the gas storage tank 39 should be determined based on the maximum CO2 filling amount in the system and the volume calculated at the highest ambient temperature that does not exceed the pressure resistance requirement of the system.

[0019] Preferably, the CO2 air conditioning heat exchanger performance test system is further improved, and the first temperature and pressure measuring point 19 is set between the sixth regulating valve 9 and the first end of the heat exchanger A under test;

[0020] The second temperature and pressure measuring point 20 is set between the tenth regulating valve 13 and the second end of the heat exchanger A under test;

[0021] The third temperature and pressure measuring point 21 is arranged between the fourth regulating valve 7 and the second end of the flow meter 3;

[0022] The fourth temperature and pressure measuring point 22 is arranged between the second end of the compressor 1 and the first end of the gas-liquid separator 16;

[0023] The fifth temperature and pressure measuring point 23 is arranged between the ninth regulating valve 12 and the first end of the calorimeter 17;

[0024] The sixth pressure measuring point 40 is disposed between the second end of the flasher 38 and the fourteenth regulating valve 37 .

[0025] Preferably, the CO2 air conditioning heat exchanger performance test system is further improved, and when the system executes the CO2 condenser test mode, the first regulating valve 4, the sixth regulating valve 9 and the tenth regulating valve 13 are closed to form a CO2 condenser test loop.

[0026] Preferably, the CO2 air conditioning heat exchanger performance test system is further improved, and when the system executes the CO2 evaporator test mode, the seventh regulating valve 10, the eighth regulating valve 11 and the eleventh regulating valve 14 are closed to form a CO2 evaporator test loop.

[0027] Preferably, the CO2 air conditioning heat exchanger performance test system is further improved, further comprising: a cooling water circulation unit, the cooling water circulation unit comprising a constant temperature water tank 30, a circulating water pump 31 and first to fourth water flow regulating valves 32 to 34;

[0028] The constant temperature water tank 30 is connected to the auxiliary condenser 2, the auxiliary evaporator 15 and the gas-liquid separator 16 through a water outlet pipe and a water return pipe respectively. A circulating water pump 31 is provided on the water outlet pipe of the constant temperature water tank 30. A first water flow regulating valve 32 is provided on the return pipe connecting the constant temperature water tank 30 and the auxiliary condenser 2. A second water flow regulating valve 33 is provided on the return pipe connecting the constant temperature water tank 30 and the auxiliary evaporator 15. A third water flow regulating valve 34 is provided on the return pipe connecting the constant temperature water tank 30 and the gas-liquid separator 16.

[0029] Preferably, the CO2 air conditioning heat exchanger performance test system is further improved, further comprising: a constant temperature chamber 25, in which the heat exchanger A under test, the tenth regulating valve 13, the eleventh regulating valve 14, the first temperature and pressure measuring point 19 and the second temperature and pressure measuring point 20 are arranged.

[0030] Preferably, the CO2 air conditioning heat exchanger performance test system is further improved, and the constant temperature chamber 25 includes an air volume measuring device 24, an air conditioning cabinet 26, a refrigeration coil 27, an air conditioning cabinet circulating fan 28 and a humidifier 29;

[0031] The air volume measuring device 24 is connected to the air outlet of the heat exchanger A under test, the air conditioning cabinet 26, the refrigeration coil 27, the air conditioning cabinet circulating fan 28 and the humidifier 29 are arranged in the constant temperature room 25, and the heat exchanger A under test is arranged at the air outlet of the air conditioning cabinet in the environmental room.

[0032] Preferably, the CO2 air-conditioning heat exchanger performance testing system is further improved, the first regulating valve 4, the sixth regulating valve 9, the seventh regulating valve 10, the eighth regulating valve 11, the tenth regulating valve 13 and the eleventh regulating valve 14 are ball valves, and the second regulating valve 5, the third regulating valve 6, the fourth regulating valve 7, the fifth regulating valve 8, the ninth regulating valve 12, the twelfth regulating valve 35, the thirteenth regulating valve 36 and the fourteenth regulating valve 37 are electric expansion valves.

[0033] Preferably, the CO2 air conditioning heat exchanger performance test system is further improved, and the flasher 38 includes:

[0034] The protective cover 41 is formed at the top of the tank body 42 and is formed in a funnel shape, and the height of the funnel mouth is lower than the height of the gas outlet 43; the function of the funnel-shaped protective cover is to prevent liquid refrigerant from entering the flash gas outlet 43;

[0035] A gas outlet 43 formed at the upper portion of the tank body 42;

[0036] Two orifice plates 44 are arranged in the tank body 42 from top to bottom. The orifice plates 44 are used to allow the liquid refrigerant to fully flash under the controlled intermediate pressure, and the gas flows out from the upper outlet 43, and the liquid flows out from the lower flash liquid refrigerant outlet 45. The tank body space below the upper orifice plate can be used for liquid storage, and the volume can be calculated according to the liquid storage amount required by the system.

[0037] A liquid refrigerant outlet 45 is formed at the bottom of the tank body 42 .

[0038] The flasher of the utility model can also be replaced by other structural types, as long as it can play the role of flashing and storing liquid.

[0039] Working principle of this utility model:

[0040] In the CO2 condenser test mode, the high-pressure inlet of the CO2 condenser under test is connected to the outlet of the superheater 18, and the high-pressure outlet is connected to the inlet of the flow meter 3. The high-pressure inlet temperature and pressure measuring point of the CO2 condenser under test is located between the outlet of the superheater 18 and the high-pressure inlet of the CO2 condenser under test; the high-pressure outlet temperature and pressure measuring point is located between the inlet of the flow meter 3 and the high-pressure outlet of the CO2 condenser under test. The outlet of compressor 1 is connected to the inlet of a superheater 18, the outlet of superheater 18 is connected to the high-pressure inlet of the CO2 condenser to be tested, the high-pressure outlet of the CO2 condenser is connected to the inlet of a flowmeter 3, the outlet of flowmeter 3 is connected to a regulating valve (a bypass valve in parallel with the regulating valve), the outlet of the regulating valve is connected to the inlet of an auxiliary evaporator 15, the outlet of the auxiliary evaporator 15 is connected to a gas-liquid separator 16, the gas-liquid separator 16 is connected to the inlet of compressor 1, forming a main loop; in addition, an auxiliary condenser 2 is bypassed at the outlet of compressor 1, and a regulating valve (a bypass valve in parallel with the regulating valve) is connected between the outlet of the auxiliary condenser 2 and the inlet of the auxiliary evaporator 15, forming a bypass loop; in addition, there is a valve at the inlet and outlet of the CO2 condenser to be tested, and there is a valve after the regulating valve at the outlet of flowmeter 3. The high-pressure inlet temperature and pressure measuring point of the CO2 condenser to be tested is located between the outlet of superheater 18 and the high-pressure inlet of the CO2 condenser to be tested; the high-pressure outlet temperature and pressure measuring point is located between the inlet of flowmeter 3 and the high-pressure outlet of the CO2 condenser to be tested. In addition, there is a pressure and temperature measuring point between the outlet of the flow meter 3 and the inlet of the regulating valve thereafter, and between the outlet of the gas-liquid separator 16 and the inlet of the compressor 1.

[0041] In the CO2 evaporator test mode, the low-pressure inlet of the CO2 evaporator under test is connected to the regulating valve at the outlet of the flow meter 3, and the low-pressure outlet is connected to the inlet of the calorimeter 17. The low-pressure inlet temperature and pressure measuring point of the CO2 evaporator under test is located between the outlet of the flow meter 3 and the low-pressure inlet of the CO2 evaporator under test; the low-pressure outlet temperature and pressure measuring point is located between the inlet of the calorimeter 17 and the low-pressure outlet of the CO2 evaporator under test. The outlet of compressor 1 is connected to the inlet of auxiliary condenser 2, the outlet of auxiliary condenser 2 is connected to flowmeter 3, the outlet of flowmeter 3 is connected to a regulating valve (a bypass valve in parallel with the regulating valve), the outlet of the regulating valve is connected to the inlet of the CO2 evaporator to be measured, the outlet of the CO2 evaporator to be measured is connected to the inlet of calorimeter 17, the outlet of calorimeter 17 is connected to a regulating valve, the outlet of the regulating valve is connected to the inlet of compressor 1, forming a main loop; in addition, a regulating valve (a bypass valve in parallel with the regulating valve) is connected to the outlet of auxiliary condenser 2 in a bypass manner, the outlet of the regulating valve is connected to the inlet of auxiliary evaporator 15, the outlet of auxiliary evaporator 15 is connected to gas-liquid separator 16, the outlet of gas-liquid separator 16 is connected to the inlet of compressor 1, forming a bypass loop; in addition, there is a valve at the inlet of flowmeter 3, and there is a valve at the inlet and outlet of the CO2 evaporator to be measured. The low-pressure inlet temperature and pressure measuring points of the tested CO2 evaporator are located between the outlet of the flow meter 3 and the low-pressure inlet of the tested CO2 evaporator; the low-pressure outlet temperature and pressure measuring points are located between the inlet of the calorimeter 17 and the low-pressure outlet of the tested CO2 evaporator. In addition, there is a pressure and temperature measuring point between the outlet of the flow meter 3 and the inlet of the regulating valve behind it, between the outlet of the gas-liquid separator 16 and the inlet of the compressor 1, and between the outlet of the calorimeter 17 and the inlet of the compressor 1.

[0042] By adding the flasher 38, the twelfth regulating valve 35, the thirteenth regulating valve 36, the fourteenth regulating valve 37 and the gas storage tank 39, the utility model can at least achieve the following beneficial effects compared with the prior art:

[0043] 1. The utility model replaces the compressor variable frequency control of the compressor suction pressure / system refrigerant flow by adding a liquid regulating valve between the flasher and the auxiliary steam to perform secondary throttling. The control coupling is smaller than the existing technology and the control stability is better.

[0044] 2. The utility model can play the role of system refrigerant liquid storage by adding a flasher, and the regulating valve of the gas path from the flasher to the auxiliary steam outlet can adjust the intermediate pressure and the storage amount at the same time, which can avoid or reduce the charging and discharging of the refrigerant when conducting experiments under different working conditions.

[0045] 3. The utility model can avoid damage to the equipment caused by overpressure of CO2 in the system when the ambient temperature is too high by adding a gas storage tank, thereby solving the problem that part of the refrigerant needs to be released from the system in summer. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1This is a schematic structural diagram of the first embodiment of the CO2 air conditioning heat exchanger performance test system of the utility model;

[0047] Figure 2 This is a structural schematic diagram of the second embodiment of the CO2 air conditioning heat exchanger performance testing system of the utility model;

[0048] Figure 3 It is a cross-sectional view of a preferred embodiment of the flasher of the utility model;

[0049] Figure 4 It is a schematic diagram of the interior of a preferred embodiment of the flasher of the utility model.

[0050] The following are the descriptions of the reference numerals:

[0051] Compressor 1

[0052] Auxiliary condenser 2

[0053] Flow meter 3

[0054] 1st to 11th regulating valves 4 to 14

[0055] Auxiliary evaporator 15

[0056] Gas-liquid separator 16

[0057] Calorimeter 17

[0058] Superheater 18

[0059] The first to fifth temperature and pressure measuring points 19-23

[0060] Air volume measuring device 24

[0061] Constant temperature room 25

[0062] Air conditioning cabinet 26

[0063] Refrigeration coil 27

[0064] Air conditioning cabinet circulation fan 28

[0065] Humidifier 29

[0066] Warm water tank 30

[0067] Circulating water pump 31

[0068] First to fourth water flow regulating valves 32 to 34

[0069] Twelfth regulating valve 35

[0070] Thirteenth regulating valve 36

[0071] Fourteenth regulating valve 37

[0072] Flasher 38

[0073] Gas tank 39

[0074] Second point 40

[0075] Protective cover 41

[0076] Tank 42

[0077] Gas outlet 43

[0078] Orifice plate 44

[0079] Liquid refrigerant outlet 45

[0080] Tested heat exchanger (i.e., tested CO2 condenser or tested CO2 evaporator) A. DETAILED DESCRIPTION

[0081] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0082] like Figure 1 As shown, the first embodiment of the CO2 air conditioning heat exchanger performance test system provided by the utility model includes: a compressor 1, an auxiliary condenser 2, a flow meter 3, first to eleventh regulating valves 4 to 14, an auxiliary evaporator 15, a gas-liquid separator 16, a calorimeter 17, a superheater 18, and first to fifth temperature and pressure measuring points 19-23;

[0083] The compressor 1 is a non-stepless frequency conversion compressor, the compressor 1 is respectively connected to the auxiliary condenser 2, the gas-liquid separator 16, the calorimeter 17 and the first end of the superheater 18, the second end of the auxiliary condenser 2 is respectively connected to the flow meter 3, the auxiliary evaporator 15 and the first end of the heat exchanger A under test, the second end of the auxiliary evaporator 15 is connected to the second end of the gas-liquid separator 16, the first end of the heat exchanger A under test is respectively connected to the first end of the auxiliary evaporator 15 and the second end of the flow meter 3, and the second end of the heat exchanger A under test is respectively connected to the second end of the calorimeter 17 and the second end of the superheater 18;

[0084] The first regulating valve 4 is arranged on the pipeline between the second end of the auxiliary condenser 2 and the first end of the flow meter 3, the second regulating valve 5 and the third regulating valve 6 are connected in parallel on the pipeline between the second end of the auxiliary condenser 2 and the first end of the auxiliary evaporator 15, the fourth regulating valve 7 and the fifth regulating valve 8 are connected in parallel and then connected in series with the sixth regulating valve 9 between the second end of the flow meter 3 and the first end of the heat exchanger A under test, the seventh regulating valve 10 and the sixth regulating valve 9 are connected in series between the first end of the auxiliary evaporator 15 and the first end of the heat exchanger A under test, the first regulating valve 4 and the eighth regulating valve 11 are connected in series between the second end of the auxiliary condenser 2 and the first end of the heat exchanger A under test, the ninth regulating valve 12 is arranged between the first end of the compressor 1 and the first end of the calorimeter 17, the tenth regulating valve 13 is arranged between the second end of the calorimeter 17 and the second end of the heat exchanger A under test, and the eleventh regulating valve 14 is arranged between the second end of the superheater 18 and the second end of the heat exchanger A under test;

[0085] A flasher 38, a first end of which is connected to the junction of the second regulating valve 5, the third regulating valve 6 and the seventh regulating valve 10, and a second end of which is connected to the first end of the auxiliary evaporator 15, which is used to adjust the pressure at the first point 22, and then adjust the refrigerant flow, replacing the compressor to achieve stepless frequency conversion control;

[0086] The twelfth regulating valve 35 and the thirteenth regulating valve 36 are connected in parallel between the flash evaporator 38 and the auxiliary evaporator 15;

[0087] A fourteenth regulating valve 37, which is connected between the second end of the flash evaporator 38 and the second end of the auxiliary evaporator 15, and is used to adjust the pressure at the second point 40;

[0088] The first temperature and pressure measuring point 19 is set between the sixth regulating valve 9 and the first end of the heat exchanger A under test, the second temperature and pressure measuring point 20 is set between the tenth regulating valve 13 and the second end of the heat exchanger A under test, the third temperature and pressure measuring point 21 is set between the fourth regulating valve 7 and the second end of the flowmeter 3, the fourth temperature and pressure measuring point 22 is set between the second end of the compressor 1 and the first end of the gas-liquid separator 16, and the fifth temperature and pressure measuring point 23 is set between the ninth regulating valve 12 and the first end of the calorimeter 17.

[0089] In this embodiment, the first regulating valve 4, the sixth regulating valve 9, the seventh regulating valve 10, the eighth regulating valve 11, the tenth regulating valve 13 and the eleventh regulating valve 14 are ball valves, the second regulating valve 5, the third regulating valve 6, the fourth regulating valve 7, the fifth regulating valve 8, the ninth regulating valve 12, the twelfth regulating valve 35, the thirteenth regulating valve 36 and the fourteenth regulating valve 37 are electric expansion valves, the auxiliary condenser 2 and the auxiliary evaporator 15 are shell and tube heat exchangers, and the superheater 18 is a plate heat exchanger.

[0090] Second embodiment;

[0091] refer to Figure 2As shown, the second embodiment of the CO2 air conditioning heat exchanger performance test system provided by the utility model is based on the above-mentioned first embodiment, and a cooling water circulation unit and a constant temperature chamber 25 are added;

[0092] The cooling water circulation unit includes a constant temperature water tank 30, a circulating water pump 31 and first to fourth water flow regulating valves 32 to 34;

[0093] The constant temperature water tank 30 is connected to the auxiliary condenser 2, the auxiliary evaporator 15 and the gas-liquid separator 16 through a water outlet pipe and a water return pipe respectively. A circulating water pump 31 is provided on the water outlet pipe of the constant temperature water tank 30. A first water flow regulating valve 32 is provided on the return pipe connecting the constant temperature water tank 30 and the auxiliary condenser 2. A second water flow regulating valve 33 is provided on the return pipe connecting the constant temperature water tank 30 and the auxiliary evaporator 15. A third water flow regulating valve 34 is provided on the return pipe connecting the constant temperature water tank 30 and the gas-liquid separator 16.

[0094] The constant temperature room 25 includes an air volume measuring device 24, an air conditioning cabinet 26, a refrigeration coil 27, an air conditioning cabinet circulation fan 28 and a humidifier 29;

[0095] The air volume measuring device 24 is connected to the air outlet of the heat exchanger A under test, the air conditioning cabinet 26, the refrigeration coil 27 and the humidifier 29 are arranged in the constant temperature room 25, the heat exchanger A under test is arranged at the air outlet of the air conditioning cabinet in the environment room, the refrigeration coil 27 is arranged next to the air conditioning cabinet 26, and the air conditioning cabinet circulation fan 28 is arranged next to the refrigeration coil 27. The air conditioning cabinet 26 and the refrigeration coil 27 control the temperature of the constant temperature room 25, and the humidifier 29 controls the humidity of the constant temperature room 25. The heat exchanger A under test, the tenth regulating valve 13, the eleventh regulating valve 14, the first temperature and pressure measuring point 19 and the second temperature and pressure measuring point 20 are arranged in the constant temperature room 25.

[0096] Third embodiment

[0097] refer to Figure 3 As shown, the utility model provides a flasher that can be used in the first embodiment or the second embodiment, including:

[0098] A protective cover 41 is formed at the top of the tank body 42 and is formed in a funnel shape, and the height of the funnel mouth is lower than the height of the gas outlet 43;

[0099] A gas outlet 43 formed at the upper portion of the tank body 42;

[0100] Two orifice plates 44 are arranged in the tank body 42 from top to bottom;

[0101] A liquid refrigerant outlet 45 is formed at the bottom of the tank body 42 .

[0102] The utility model can control the working state of each component in the test system, so that the temperature and pressure at the high-pressure and low-pressure inlet and outlet of the CO2 heat exchanger under test, as well as the flow through the CO2 heat exchanger under test, can always be maintained under the test conditions, thereby accurately monitoring whether the performance of the CO2 heat exchanger under test meets the requirements; the system can switch its test conditions and test objects through the setting and switching of valves and the position change of measuring points, and change the flow direction of the refrigerant in the pipeline as needed without increasing the hardware cost, thereby realizing the function of testing the CO2 air conditioning heat exchanger.

[0103] The utility model replaces the compressor frequency conversion control of the compressor suction pressure / system refrigerant flow by adding a liquid circuit regulating valve between the flasher and the flasher and the auxiliary steam to perform secondary throttling, adds a gas circuit regulating valve from the flasher to the auxiliary steam outlet to adjust the intermediate pressure and the liquid storage volume at the same time, and adds a gas storage tank to avoid CO2 overpressure in the system causing equipment damage when the ambient temperature is too high.

[0104] The above is a detailed description of the present invention through specific embodiments, which are only preferred embodiments of the present invention and do not limit the present invention. Without departing from the principle of the present invention, equivalent replacements and improvements made by technicians in the field to the setting of components in the test system, the position setting of valves, and the selection of the position of measuring points should be regarded as within the technical scope protected by the present invention.

Claims

1. A CO2 air conditioning heat exchanger performance test system, comprising: Compressor (1), auxiliary condenser (2), flow meter (3), first to eleventh regulating valves (4 to 14), auxiliary evaporator (15), gas-liquid separator (16), calorimeter (17), superheater (18), first to fifth temperature and pressure measuring points (19 to 23); The compressor (1) is respectively connected to the first ends of the auxiliary condenser (2), the gas-liquid separator (16), the calorimeter (17) and the superheater (18); the second end of the auxiliary condenser (2) is respectively connected to the flow meter (3), the auxiliary evaporator (15) and the first end of the heat exchanger (A) to be tested; the second end of the auxiliary evaporator (15) is connected to the second end of the gas-liquid separator (16); the first end of the heat exchanger (A) to be tested is respectively connected to the first end of the auxiliary evaporator (15) and the second end of the flow meter (3); and the second end of the heat exchanger (A) to be tested is respectively connected to the second end of the calorimeter (17) and the second end of the superheater (18); The first regulating valve (4) is arranged on the pipeline between the second end of the auxiliary condenser (2) and the first end of the flow meter (3); the second regulating valve (5) and the third regulating valve (6) are connected in parallel on the pipeline between the second end of the auxiliary condenser (2) and the first end of the auxiliary evaporator (15); the fourth regulating valve (7) and the fifth regulating valve (8) are connected in parallel and then connected in series with the sixth regulating valve (9) between the second end of the flow meter (3) and the first end of the heat exchanger (A) to be measured; the seventh regulating valve (10) and the sixth regulating valve (9) are connected in series with the auxiliary evaporator (15) ) between the first end of the auxiliary condenser (2) and the first end of the heat exchanger (A) to be tested, the first regulating valve (4) and the eighth regulating valve (11) are arranged in series between the second end of the auxiliary condenser (2) and the first end of the heat exchanger (A) to be tested, the ninth regulating valve (12) is arranged between the first end of the compressor (1) and the first end of the calorimeter (17), the tenth regulating valve (13) is arranged between the second end of the calorimeter (17) and the second end of the heat exchanger (A) to be tested, and the eleventh regulating valve (14) is arranged between the second end of the superheater (18) and the second end of the heat exchanger (A) to be tested; The invention is characterized in that the compressor (1) is a non-stepless variable frequency compressor, and further comprises: A flasher (38), a first end of which is connected to the junction of the second regulating valve (5), the third regulating valve (6) and the seventh regulating valve (10), and a second end of which is connected to the first end of the auxiliary evaporator (15), and is used to adjust the pressure at the first point (22), thereby adjusting the flow rate of the refrigerant, and replacing the compressor to achieve stepless frequency conversion control; The twelfth regulating valve (35) and the thirteenth regulating valve (36) are connected in parallel between the flash evaporator (38) and the auxiliary evaporator (15); The fourteenth regulating valve (37) is connected between the second end of the flash device (38) and the second end of the auxiliary evaporator (15), and is used to adjust the pressure at the second point (40).

2. The CO2 air conditioning heat exchanger performance testing system according to claim 1, characterized in that: Also includes: The air storage tank (39) is arranged on the air suction end pipeline of the compressor (1).

3. The CO2 air conditioning heat exchanger performance testing system as claimed in claim 2, characterized in that: The first temperature and pressure measuring point (19) is arranged between the sixth regulating valve (9) and the first end of the heat exchanger (A) to be measured; The second temperature and pressure measuring point (20) is arranged between the tenth regulating valve (13) and the second end of the heat exchanger (A) to be measured; The third temperature and pressure measuring point (21) is arranged between the fourth regulating valve (7) and the second end of the flow meter (3); The fourth temperature and pressure measuring point (22) is arranged between the second end of the compressor (1) and the first end of the gas-liquid separator (16); The fifth temperature and pressure measuring point (23) is arranged between the ninth regulating valve (12) and the first end of the calorimeter (17); The sixth pressure measuring point (40) is arranged between the second end of the flasher (38) and the fourteenth regulating valve (37).

4. The CO2 air conditioning heat exchanger performance testing system as claimed in claim 2, characterized in that: When the system executes the CO2 condenser test mode, the first regulating valve (4), the sixth regulating valve (9) and the tenth regulating valve (13) are closed to form a CO2 condenser test loop.

5. The CO2 air conditioning heat exchanger performance testing system as claimed in claim 2, characterized in that: When the system executes the CO2 evaporator test mode, the seventh regulating valve (10), the eighth regulating valve (11) and the eleventh regulating valve (14) are closed to form a CO2 evaporator test loop.

6. The CO2 air conditioning heat exchanger performance testing system according to claim 1, characterized in that: Also includes: A cooling water circulation unit, the cooling water circulation unit comprising a constant temperature water tank (30), a circulating water pump (31) and first to fourth water flow regulating valves (32 to 34); The thermostatic water tank (30) is respectively connected to the auxiliary condenser (2), the auxiliary evaporator (15) and the gas-liquid separator (16) via a water outlet pipeline and a water return pipeline; a circulating water pump (31) is provided on the water outlet pipeline of the thermostatic water tank (30); a first water flow regulating valve (32) is provided on the water return pipeline connecting the thermostatic water tank (30) and the auxiliary condenser (2); a second water flow regulating valve (33) is provided on the water return pipeline connecting the thermostatic water tank (30) and the auxiliary evaporator (15); and a third water flow regulating valve (34) is provided on the water return pipeline connecting the thermostatic water tank (30) and the gas-liquid separator (16).

7. The CO2 air conditioning heat exchanger performance testing system according to any one of claims 1 to 6, characterized in that: Also includes: A constant temperature chamber (25), a heat exchanger to be tested (A), a tenth regulating valve (13), an eleventh regulating valve (14), a first temperature and pressure measuring point (19), and a second temperature and pressure measuring point (20) are arranged in the constant temperature chamber (25).

8. The CO2 air conditioning heat exchanger performance testing system as claimed in claim 7, characterized in that: The constant temperature room (25) includes an air volume measuring device (24), an air conditioning cabinet (26), a refrigeration coil (27), an air conditioning cabinet circulation fan (28) and a humidifier (29); The air volume measuring device (24) is connected to the air outlet of the heat exchanger (A) under test, the air conditioning cabinet (26), the refrigeration coil (27), the air conditioning cabinet circulation fan (28) and the humidifier (29) are arranged in the constant temperature room (25), and the heat exchanger (A) under test is arranged at the air outlet of the air conditioning cabinet in the environmental room.

9. The CO2 air conditioning heat exchanger performance testing system according to any one of claims 1 to 6, characterized in that: The first regulating valve (4), the sixth regulating valve (9), the seventh regulating valve (10), the eighth regulating valve (11), the tenth regulating valve (13) and the eleventh regulating valve (14) are ball valves, and the second regulating valve (5), the third regulating valve (6), the fourth regulating valve (7), the fifth regulating valve (8), the ninth regulating valve (12), the twelfth regulating valve (35), the thirteenth regulating valve (36) and the fourteenth regulating valve (37) are electric expansion valves.

10. The CO2 air conditioning heat exchanger performance testing system according to any one of claims 1 to 6, characterized in that: The flasher (38) comprises: A protective cover (41) is formed at the top of the tank body (42) and is formed in a funnel shape, wherein the height of the funnel opening is lower than the height of the gas outlet (43); A gas outlet (43) formed at the upper portion of the tank body (42); Two orifice plates (44) are arranged in the tank body (42) one above the other; A liquid refrigerant outlet (45) is formed at the bottom of the tank body (42).

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