A test device that meets the requirements of R744 supercritical and subcritical valves

Abstract

The present invention discloses a device for testing R744 supercritical and subcritical valves, and relates to the technical field of refrigeration system valve testing. The present invention includes a parallel compression component, a test component, and an auxiliary component. The test component is connected in series with the parallel compression component at the head and tail, and the auxiliary component is connected in series to the test component; the test component includes a condenser and a second air cooler, the oil separation refrigerant outlet is connected to the condenser and the second air cooler respectively through a three-way joint, the condenser refrigerant end outlet is connected to the liquid storage tank, and the liquid storage tank refrigerant end outlet is connected to the second air cooler inlet through a refrigerant pipeline; the second air cooler is sequentially connected to an oil heater, a valve under test, and a second evaporator through a refrigerant pipeline. The present invention ensures that the inlet and outlet flow directions of the valve under test are automatically switched without disassembling the valve under test, which is conducive to frequent switching tests in the positive and negative directions of the durability test, and can also realize the performance test of the valve under test without disassembling the valve under test.

Description

Technical Field

[0001] The invention belongs to the technical field of refrigeration system valve component testing, and in particular relates to a device for testing R744 supercritical and subcritical valve components. Background Art

[0002] With the development of the global environmentally friendly refrigerant replacement process, natural refrigerant R744 (carbon dioxide) has begun to be widely used in large supermarkets, cold storage and new energy vehicles. However, since its operating pressure is 5-10 times higher than that of conventional refrigerants, the operating pressure range can reach 5~15MPa, and the exhaust temperature can reach 130℃, all components in the refrigeration system need to be newly developed. As one of the important components of the refrigeration system, valves (including expansion valves, solenoid valves, three-way joint valves, etc.) have a great impact on the overall system energy efficiency due to their flow performance, flow resistance state, stability, durability, abnormal sound, etc., so there is an urgent need for comprehensive and stable test equipment to test them.

[0003] At present, all major refrigeration system manufacturers have increased the intensity of matching tests for compressors and valves. Among them, the expansion valve, as one of the important valves, can automatically adjust the refrigerant flow to ensure that the refrigeration system can always maintain the best operating conditions, speed up the refrigeration speed, accurately control the temperature, and achieve energy saving. However, since R744 is rarely used as a refrigerant, the corresponding test equipment is also mainly built according to the actual use system, such as Figure 1 The original test system diagram shows that this type of test equipment has poor working condition control stability, slow stabilization speed and narrow control range; when testing the expansion valve, it is mainly necessary to control the temperature, pressure and refrigerant flow before and after the expansion valve refrigerant end; while the above test system diagram only relies on the compressor frequency conversion to control the flow. Due to the limited frequency conversion range and large adjustment range of the single-stage compressor, the flow control range is small and the stability is poor. At the same time, the high-pressure pressure is controlled by the water volume or water temperature on the air cooler side, resulting in a very slow control speed; when testing the durability or performance of some valves, there will be a need for reverse testing of the valves, and the above test equipment does not have the ability to test reverse flow. The valves need to be removed and reversed for testing. If the durability test requires repeated changes in the flow direction, it cannot be met; when testing the inlet high temperature condition, the inlet temperature is controlled by the compressor exhaust temperature, and the exhaust temperature depends on the suction superheat, resulting in stability deviation and a narrow control range.

[0004] Existing valve testing equipment cannot quickly and stably control the refrigerant inlet temperature, inlet and outlet pressures, and refrigerant flow rate of the valve to be tested, and cannot meet the requirements of fast and stable working conditions. At the same time, the valve needs to be frequently disassembled and assembled during reverse testing, which is rather troublesome. For this reason, the present invention proposes a test device that meets the requirements of R744 supercritical and subcritical valves. Summary of the invention

[0005] The purpose of the present invention is to provide a supercritical and subcritical valve testing device that meets the requirements of R744, so as to solve the problem that the existing valve testing equipment cannot quickly and stably control the refrigerant inlet temperature, inlet and outlet pressures, and refrigerant flow rate of the valve to be tested, and cannot meet the requirements of fast and stable working conditions. At the same time, the valve needs to be frequently disassembled and assembled during reverse testing, which is quite troublesome.

[0006] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0007] The present invention is a device for testing R744 supercritical and subcritical valve components, comprising a parallel compression component, a test component and an auxiliary component, wherein the test component is connected in series with the parallel compression component at the head and tail, and the auxiliary component is connected in series with the test component;

[0008] The parallel compression assembly comprises a primary compressor and a secondary compressor connected in parallel to each other, and the inlet and outlet ends of the parallel circuit formed by the primary compressor and the secondary compressor are respectively connected to a gas separator and an oil separator; a first air cooler is also connected between the primary compressor and the secondary compressor;

[0009] The test assembly includes a condenser and a second air cooler, the oil-separator refrigerant outlet is connected to the condenser and the second air cooler respectively through a three-way joint, the condenser refrigerant outlet is connected to a liquid storage tank, and the liquid storage tank refrigerant outlet is connected to the second air cooler inlet through a refrigerant pipeline; the second air cooler is connected to an oil heater, a valve under test and a second evaporator in sequence through a refrigerant pipeline, and the second evaporator is connected to the gas-separator refrigerant inlet through a refrigerant pipe to form a loop.

[0010] Preferably, the auxiliary component includes a first evaporator, the refrigerant inlet of the first evaporator is connected to the outlet of the liquid storage tank through a refrigerant pipe, and the refrigerant outlet of the first evaporator is connected to the refrigerant pipe between the second evaporator and the gas separator; a regulating valve UNW3 is installed on the refrigerant pipe between the first evaporator and the liquid storage tank.

[0011] Preferably, the air inlet end of the first-stage compressor is provided with a pneumatic ball valve UNS1, and the air outlet end of the first-stage compressor is provided with a temperature measurement and control point TWS2 and a pneumatic ball valve UNS2; the air inlet end of the second-stage compressor is provided with a pneumatic ball valve UNS4 and a temperature measurement and control point TIS3, and the air outlet end of the second-stage compressor is provided with a temperature measurement and control point TWS4 and a pneumatic ball valve UNS1; a pneumatic ball valve UNS25 is provided on the refrigerant pipeline at the air inlet end of the first air cooler; the refrigerant pipeline at the air inlet end of the first air cooler is connected between the temperature measurement and control point TWS2 and the pneumatic ball valve UNS2; a pneumatic ball valve UNS26 is provided on the refrigerant pipeline at the air outlet end of the first air cooler; the refrigerant pipeline at the air outlet end of the first air cooler is connected between the pneumatic ball valve UNS4 and the temperature measurement and control point TIS3.

[0012] Preferably, a pressure measurement and control point PSE1 and a temperature measurement and control point TIS1 are provided at the gas outlet end of the gas separator; and the oil return end of the oil separator is respectively connected to the primary compressor and the secondary compressor through two oil return pipes.

[0013] Preferably, a regulating valve UNW5 is provided on the refrigerant pipeline between the condenser and the oil separator, and a pneumatic ball valve UNS28 is connected in parallel at both ends of the inlet and outlet of the regulating valve UNW5; a pneumatic ball valve UNS13 is provided on the refrigerant pipeline between the second air cooler and the oil separator; a pneumatic ball valve UNS29 is provided on the refrigerant pipeline between the liquid storage tank and the second air cooler, and the refrigerant pipeline is connected between the pneumatic ball valve UNS13 and the second air cooler;

[0014] A temperature measurement and control point TIS10 is arranged between the second air cooler and the oil heater, and a pneumatic ball valve UNS19, a temperature measurement and control point TIS6, a pressure measurement and control point PSE6, a valve under test, a temperature measurement and control point TIS7, a pressure measurement and control point PSE7, a pneumatic ball valve UNS20 and a regulating valve UNW1 are arranged in sequence on the refrigerant pipeline between the outlet end of the oil heater and the second evaporator; a pneumatic ball valve UNS15 is connected in parallel between the air inlet end of the pneumatic ball valve UNS19 and the air inlet end of the pneumatic ball valve UNS20; a pneumatic ball valve UNS16 is connected in parallel between the outlet end of the pneumatic ball valve UNS19 and the outlet end of the pneumatic ball valve UNS20; a temperature measurement and control point TIS5 and a pneumatic ball valve UNS14 are respectively arranged at the outlet end of the second evaporator.

[0015] Preferably, the parameters to be controlled in the performance test of the valve under test include the following: valve pre-pressure PSE6: controlled by the condenser during subcritical test, and controlled by the regulating valve UNW5 during supercritical test; valve pre-temperature TIS6: controlled by the second air cooler and the oil heater; valve under test outlet pressure PSE6: controlled by the regulating valve UNW3;

[0016] The parameters that need to be controlled for the flow resistance test sample of the valve under test include the following: the valve pre-pressure PSE6: controlled by the condenser during subcritical testing and controlled by the regulating valve UNW5 during supercritical testing; the valve pre-temperature TIS6: controlled by the second air cooler and the oil heater; the valve under test outlet pressure PSE6: controlled by the regulating valve UNW1.

[0017] Preferably, when the valve is tested under the subcritical forward state, the first-stage compressor and the second-stage compressor remain in parallel, and the pneumatic ball valve UNS13, regulating valve UNW5, pneumatic ball valve UNS15, and pneumatic ball valve UNS16 are closed. The refrigerant enters the test assembly from the parallel compression assembly and flows in sequence through the pneumatic ball valve UNS28, condenser, liquid storage tank, pneumatic ball valve UNS29, second air cooler, oil heater, pneumatic ball valve UNS19, temperature measurement and control point TIS6, pressure measurement and control point PSE6, the valve under test, temperature measurement and control point TIS7, pressure measurement and control point PSE7, pneumatic ball valve UNS20, regulating valve UNW1 and the second evaporator until the gas separation completes a loop.

[0018] Preferably, when the valve is tested under the subcritical reverse state, the first-stage compressor and the second-stage compressor remain in parallel, and the pneumatic ball valve UNS13, the regulating valve UNW5, the pneumatic ball valve UNS19, and the pneumatic ball valve UNS20 are closed. The refrigerant enters the test assembly from the parallel compression assembly and flows in sequence through the pneumatic ball valve UNS28, the condenser, the liquid storage tank, the pneumatic ball valve UNS29, the second air cooler, the oil heater, the pneumatic ball valve UNS15, the pressure measurement and control point PSE7, the temperature measurement and control point TIS7, the valve under test, the pressure measurement and control point PSE6, the temperature measurement and control point TIS6, the pneumatic ball valve UNS16, the regulating valve UNW1 and the second evaporator until the gas separation completes a loop.

[0019] Preferably, when the valve components are tested under the supercritical forward state, the first-stage compressor and the second-stage compressor remain in parallel, and the pneumatic ball valve UNS28, pneumatic ball valve UNS29, pneumatic ball valve UNS15, and pneumatic ball valve UNS16 are closed. After the refrigerant is discharged from the parallel compression assembly, it is divided into two liquid circuits, in which the refrigerant in one liquid circuit flows through the regulating valve UNW5, the condenser, the liquid storage tank, and the first evaporator in sequence until the gas component completes a circuit; the refrigerant in the other liquid circuit flows through the pneumatic ball valve UNS13, the second air cooler, the oil heater, the pneumatic ball valve UNS19, the temperature measurement and control point TIS6, the pressure measurement and control point PSE6, the valve component under test, the temperature measurement and control point TIS7, the pressure measurement and control point PSE7, the pneumatic ball valve UNS20, the regulating valve UNW1, and the second evaporator in sequence until the gas component completes a circuit.

[0020] Preferably, when the valve components are tested under the supercritical forward state, the first-stage compressor and the second-stage compressor remain in parallel, and the pneumatic ball valve UNS28, pneumatic ball valve UNS29, pneumatic ball valve UNS19, and pneumatic ball valve UNS20 are closed. After the refrigerant is discharged from the parallel compression assembly, it is divided into two liquid circuits, in which the refrigerant in one liquid circuit flows through the regulating valve UNW5, the condenser, the liquid storage tank, and the first evaporator in sequence until the gas component completes a circuit; the refrigerant in the other liquid circuit flows through the pneumatic ball valve UNS13, the second air cooler, the oil heater, the pneumatic ball valve UNS15, the pressure measurement and control point PSE7, the temperature measurement and control point TIS7, the valve component under test, the pressure measurement and control point PSE6, the temperature measurement and control point TIS6, the pneumatic ball valve UNS16, the regulating valve UNW1, and the second evaporator in sequence until the gas component completes a circuit.

[0021] The present invention has the following beneficial effects:

[0022] The present invention improves the transcritical operating range of the compressor by setting the compressor to a series-parallel scheme to meet the use of high-pressure ratio conditions. In the series mode, multiple compressors can be used in parallel at each stage to meet the large flow test requirements under high-pressure ratio conditions; at the same time, a large range of inlet temperature control is achieved through air cooling and oil heating; through compressor frequency conversion and auxiliary component bypass flow control, energy saving is achieved while meeting the requirements of large flow span and working condition stability.

[0023] The present invention controls the refrigerant flow of the test component by setting two compressor frequency conversions and a regulating valve UNW3 in the auxiliary circuit component. The first-stage compressor and the second-stage compressor select high, medium and low frequency operation to fix the approximate total refrigerant flow of the system, and then shunts the refrigerant flow through the auxiliary circuit regulating valve UNW3 to achieve precise control of the refrigerant flow of the test circuit.

[0024] The present invention controls the compressor exhaust section pressure by adjusting the opening of the valve UNW5, and further controls the valve pre-pressure PSE6 of the valve under test; since the regulating valve opening responds quickly, it is faster and more direct than the original method of adjusting the condenser water path temperature or flow.

[0025] In the present invention, since a single-stage compressor has its own operating range limitations, when operating under supercritical conditions, under some heat pump conditions, the operating pressure ratio required for the valve under test test will exceed the compressor operating range. In order to avoid excessively high compressor exhaust temperature and reliable compressor operation, two auxiliary compressors are connected in series to operate. At this time, auxiliary compressor MCM1 is a first-stage compressor (low-pressure stage), and auxiliary compressor MCM2 is a high-pressure stage. The exhaust of the first-stage compressor is cooled by the first air cooler and then enters the suction end of the second-stage compressor, thereby realizing high-pressure ratio operation.

[0026] In the present invention, the pneumatic ball valves UNS15, UNS16, UNS19 and UNS20 are switched accordingly according to the flow direction of the valve component under test. When testing the forward flow, the pneumatic ball valves UNS15 and UNS16 are closed, and the pneumatic ball valves UNS19 and UNS20 are opened. When testing the reverse flow, the pneumatic ball valves UNS15 and UNS16 are opened, and the pneumatic ball valves UNS19 and UNS20 are closed. In this way, the inlet and outlet flow directions of the valve component under test can be automatically switched without disassembling the valve component under test, which is beneficial to the frequent switching test of the forward and reverse directions of the durability test, and the performance test of the valve component under test can also be realized without disassembling the valve component under test.

[0027] In the present invention, the condenser inlet temperature is controlled by the second air cooler and the oil heater. When the inlet temperature is medium or low, it is pre-cooled or directly controlled by the second air cooler. When controlling extremely high temperature conditions, it is directly controlled by the oil heater, which can achieve a wide range of inlet temperature control with a maximum temperature of 160°C. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0029] Figure 1 This is a schematic diagram of the supercritical valve test in the prior art;

[0030] Figure 2 The general diagram of the R744 supercritical and subcritical heat exchanger testing device provided by the present invention;

[0031] Figure 3 This is a diagram of the parallel operation of compressors in the present invention;

[0032] Figure 4 This is a diagram of the compressors in series operation in the present invention;

[0033] Figure 5 A test operation diagram of a subcritical forward valve provided by the present invention;

[0034] Figure 6 A test operation diagram of a subcritical reverse valve provided by the present invention;

[0035] Figure 7 A test operation diagram of a supercritical forward valve provided by the present invention;

[0036] Figure 8 This is a test operation diagram of the supercritical reverse valve provided by the present invention.

[0037] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0038] 1. First-stage compressor; 2. Second-stage compressor; 3. First air cooler; 4. Oil separator; 5. Gas separator; 6. Condenser; 7. Second air cooler; 8. Oil heater; 9. First evaporator; 10. Second evaporator; 11. Liquid storage tank; 12. Tested valve. DETAILED DESCRIPTION

[0039] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0040] See also Figure 1-3 The present invention is a device for testing R744 supercritical and subcritical valve components, comprising a parallel compression assembly, a test assembly and an auxiliary assembly, wherein the test assembly is connected in series with the parallel compression assembly at the head and tail, and the auxiliary assembly is connected in series with the test assembly;

[0041] The parallel compression assembly includes a primary compressor 1 and a secondary compressor 2 connected in parallel to each other. The inlet and outlet ends of the parallel loop formed by the primary compressor 1 and the secondary compressor 2 are respectively connected with a gas separator 5 and an oil separator 4; a first air cooler 3 is also connected between the primary compressor 1 and the secondary compressor 2; the primary compressor 1 and the secondary compressor 2 are used to provide the refrigerant flow of the test system, thereby establishing a system operating pressure difference; the first air cooler 3 is used to control the suction temperature of the secondary compressor 2 when the compressors are connected in series; the oil separator 4 is used to separate the compressor oil in the refrigerant discharged from the two compressors and return it to the compressor again through the oil return pipeline; the gas separator is used to protect the compressor from sucking liquid;

[0042] The test assembly includes a condenser 6 and a second air cooler 7. The refrigerant outlet of the oil separator 4 is connected to the condenser 6 and the second air cooler 7 respectively through a three-way joint. The refrigerant outlet of the condenser 6 is connected to the liquid storage tank 11. The refrigerant outlet of the liquid storage tank 11 is connected to the inlet of the second air cooler 7 through a refrigerant pipeline. The second air cooler 7 is connected to the oil heater 8, the valve component 12 under test and the second evaporator 10 in sequence through the refrigerant pipeline. The second evaporator 10 is connected to the refrigerant inlet of the gas separator 5 through a refrigerant pipe to form a loop.

[0043] Among them, the auxiliary component includes a first evaporator 9, the refrigerant inlet of the first evaporator 9 is connected to the outlet of the liquid storage tank 11 through a refrigerant pipe, and the refrigerant outlet of the first evaporator 9 is connected to the refrigerant pipe between the second evaporator 10 and the gas separator 5; a regulating valve UNW3 is installed on the refrigerant pipe between the first evaporator 9 and the liquid storage tank 11.

[0044] Among them, a pneumatic ball valve UNS1 is provided at the air inlet end of the first-stage compressor 1, and a temperature measurement and control point TWS2 and a pneumatic ball valve UNS2 are provided at the air outlet end of the first-stage compressor 1; a pneumatic ball valve UNS4 and a temperature measurement and control point TIS3 are provided at the air inlet end of the second-stage compressor 2, and a temperature measurement and control point TWS4 and a pneumatic ball valve UNS1 are provided at the air outlet end of the second-stage compressor 2; a pneumatic ball valve UNS25 is provided on the refrigerant pipeline at the air inlet end of the first air cooler 3; the refrigerant pipeline at the air inlet end of the first air cooler 3 is connected between the temperature measurement and control point TWS2 and the pneumatic ball valve UNS2; a pneumatic ball valve UNS26 is provided on the refrigerant pipeline at the air outlet end of the first air cooler 3; the refrigerant pipeline at the air outlet end of the first air cooler 3 is connected between the pneumatic ball valve UNS4 and the temperature measurement and control point TIS3.

[0045] Among them, the gas outlet end of the gas separator 5 is provided with a pressure measurement and control point PSE1 and a temperature measurement and control point TIS1; the oil return end of the oil separator 4 is connected to the first-stage compressor 1 and the second-stage compressor 2 respectively through two oil return pipes.

[0046] Among them, a regulating valve UNW5 is provided on the refrigerant pipeline between the condenser 6 and the oil separator 4, and a pneumatic ball valve UNS28 is connected in parallel at both ends of the inlet and outlet of the regulating valve UNW5; a pneumatic ball valve UNS13 is provided on the refrigerant pipeline between the second air cooler 7 and the oil separator 4; a pneumatic ball valve UNS29 is provided on the refrigerant pipeline between the liquid storage tank 11 and the second air cooler 7, and the refrigerant pipeline is connected between the pneumatic ball valve UNS13 and the second air cooler 7;

[0047] A temperature measurement and control point TIS10 is arranged between the second air cooler 7 and the oil heater 8, and a pneumatic ball valve UNS19, a temperature measurement and control point TIS6, a pressure measurement and control point PSE6, a valve component 12 to be measured, a temperature measurement and control point TIS7, a pressure measurement and control point PSE7, a pneumatic ball valve UNS20 and a regulating valve UNW1 are arranged in sequence on the refrigerant pipeline between the air outlet end of the oil heater 8 and the second evaporator 10; a pneumatic ball valve UNS15 is connected in parallel between the air inlet end of the pneumatic ball valve UNS19 and the air inlet end of the pneumatic ball valve UNS20; a pneumatic ball valve UNS16 is connected in parallel between the air outlet end of the pneumatic ball valve UNS19 and the air outlet end of the pneumatic ball valve UNS20; a temperature measurement and control point TIS5 and a pneumatic ball valve UNS14 are respectively arranged at the air outlet end of the second evaporator 10.

[0048] Among them, the parameters that need to be controlled in the performance test of the tested valve component 12 include the following: the valve front pressure PSE6: controlled by the condenser 6 during the subcritical test, and controlled by the regulating valve UNW5 during the supercritical test; the valve front temperature TIS6: controlled by the second air cooler 7 and the oil heater 8; the tested valve component 12 outlet pressure PSE6: controlled by the regulating valve UNW3;

[0049] The parameters that need to be controlled for the resistance test sample of the valve component 12 under test include the following: pre-valve pressure PSE6: controlled by condenser 6 during subcritical test and controlled by regulating valve UNW5 during supercritical test; pre-valve temperature TIS6: controlled by the second air cooler 7 and the oil heater 8; outlet pressure PSE6 of the valve component 12 under test: controlled by regulating valve UNW1.

[0050] Among them, the pneumatic ball valve is used to switch the system refrigerant flow path; the regulating valve is used to adjust the refrigerant flow rate of the corresponding flow path, thereby controlling the temperature and pressure measurement and control points in the system; the condenser 6 controls the system intermediate pressure in the supercritical state, and the condenser 6 controls the system high pressure in the subcritical state; the second air cooler 7 and the oil heater are used to control the pre-valve temperature or the inlet temperature of the condenser 6; the first evaporator 9 is used to control the suction superheat of the two compressors; the second evaporator 10 is used to control the superheat of the refrigerant before the flowmeter in the test flow path, ensuring that the flowmeter inlet is superheated gaseous refrigerant, ensuring measurement accuracy; the liquid storage tank 11 is used to store the refrigerant amount in the buffer system.

[0051] Example 1: See Figure 5 When the valve is tested under the subcritical positive state, the first-stage compressor 1 and the second-stage compressor 2 remain in parallel, and the pneumatic ball valve UNS13, regulating valve UNW5, pneumatic ball valve UNS15, and pneumatic ball valve UNS16 are closed. The refrigerant enters the test assembly from the parallel compression assembly and flows through the pneumatic ball valve UNS28, condenser 6, liquid storage tank 11, pneumatic ball valve UNS29, the second air cooler 7, oil heater 8, pneumatic ball valve UNS19, temperature measurement and control point TIS6, pressure measurement and control point PSE6, the valve under test 12, temperature measurement and control point TIS7, pressure measurement and control point PSE7, pneumatic ball valve UNS20, regulating valve UNW1 and the second evaporator 10 until the gas separator 5 completes a loop.

[0052] Example 2: See Figure 6 When the valve is tested under the subcritical reverse state, the first-stage compressor 1 and the second-stage compressor 2 remain in parallel, and the pneumatic ball valve UNS13, the regulating valve UNW5, the pneumatic ball valve UNS19, and the pneumatic ball valve UNS20 are closed. The refrigerant enters the test assembly from the parallel compression assembly and flows through the pneumatic ball valve UNS28, the condenser 6, the liquid storage tank 11, the pneumatic ball valve UNS29, the second air cooler 7, the oil heater 8, the pneumatic ball valve UNS15, the pressure measurement and control point PSE7, the temperature measurement and control point TIS7, the valve under test 12, the pressure measurement and control point PSE6, the temperature measurement and control point TIS6, the pneumatic ball valve UNS16, the regulating valve UNW1 and the second evaporator 10 until the gas separator 5 completes a loop.

[0053] Example 3: See Figure 7When the valve is tested under the supercritical forward state, the first-stage compressor 1 and the second-stage compressor 2 are kept in parallel, and the pneumatic ball valve UNS28, pneumatic ball valve UNS29, pneumatic ball valve UNS15, and pneumatic ball valve UNS16 are closed. After the refrigerant is discharged from the parallel compression component, it is divided into two liquid circuits. The refrigerant in one liquid circuit flows through the regulating valve UNW5, condenser 6, liquid storage tank 11, and the first evaporator 9 in turn until the gas separator completes a circuit; the refrigerant in the other liquid circuit flows through the pneumatic ball valve UNS13, the second air cooler 7, the oil heater 8, the pneumatic ball valve UNS19, the temperature measurement and control point TIS6, the pressure measurement and control point PSE6, the valve under test 12, the temperature measurement and control point TIS7, the pressure measurement and control point PSE7, the pneumatic ball valve UNS20, the regulating valve UNW1, and the second evaporator 10 in turn until the gas separator 5 completes a circuit.

[0054] Example 4: See Figure 8 When the valve is tested under the supercritical forward state, the first-stage compressor 1 and the second-stage compressor 2 are kept in parallel, and the pneumatic ball valve UNS28, pneumatic ball valve UNS29, pneumatic ball valve UNS19, and pneumatic ball valve UNS20 are closed. After the refrigerant is discharged from the parallel compression component, it is divided into two liquid circuits. The refrigerant in one liquid circuit flows through the regulating valve UNW5, condenser 6, liquid storage tank 11, and the first evaporator 9 in turn until the gas part completes a circuit; the refrigerant in the other liquid circuit flows through the pneumatic ball valve UNS13, the second air cooler 7, the oil heater 8, the pneumatic ball valve UNS15, the pressure measurement and control point PSE7, the temperature measurement and control point TIS7, the valve part 12 under test, the pressure measurement and control point PSE6, the temperature measurement and control point TIS6, the pneumatic ball valve UNS16, the regulating valve UNW1, and the second evaporator 10 in turn until the gas part 5 completes a circuit.

[0055] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A test device for supercritical and subcritical valves meeting the requirements of R744, characterized in that: It includes a parallel compression component, a test component and an auxiliary component, wherein the test component is connected in series with the parallel compression component at the head and tail, and the auxiliary component is connected in series with the test component; The parallel compression assembly comprises a first compressor (1) and a second compressor (2) connected in parallel to each other, wherein the inlet and outlet ends of the parallel circuit formed by the first compressor (1) and the second compressor (2) are respectively connected to a gas separator (5) and an oil separator (4); a first air cooler (3) is also connected between the first compressor (1) and the second compressor (2); The test assembly comprises a condenser (6) and a second air cooler (7); the refrigerant outlet of the oil separator (4) is connected to the condenser (6) and the second air cooler (7) respectively via a three-way joint; the refrigerant outlet of the condenser (6) is connected to a liquid storage tank (11); the refrigerant outlet of the liquid storage tank (11) is connected to an inlet of the second air cooler (7) via a refrigerant pipeline; the second air cooler (7) is sequentially connected to an oil heater (8), a valve component to be tested (12) and a second evaporator (10) via a refrigerant pipeline; the second evaporator (10) is connected to the refrigerant inlet of the gas separator (5) via a refrigerant pipe to form a loop; The auxiliary component comprises a first evaporator (9), a refrigerant inlet of the first evaporator (9) being connected to an outlet of a liquid storage tank (11) via a refrigerant pipeline, and the refrigerant outlet of the first evaporator (9) being connected to a refrigerant pipeline between a second evaporator (10) and a gas separator (5); a regulating valve UNW3 is installed on the refrigerant pipeline between the first evaporator (9) and the liquid storage tank (11); A regulating valve UNW5 is provided on the refrigerant pipeline between the condenser (6) and the oil separator (4), and a pneumatic ball valve UNS28 is connected in parallel at both ends of the inlet and outlet of the regulating valve UNW5; a pneumatic ball valve UNS13 is provided on the refrigerant pipeline between the second air cooler (7) and the oil separator (4); a pneumatic ball valve UNS29 is provided on the refrigerant pipeline between the liquid storage tank (11) and the second air cooler (7), and the refrigerant pipeline is connected between the pneumatic ball valve UNS13 and the second air cooler (7); A temperature measurement and control point TIS10 is provided between the second air cooler (7) and the oil heater (8); a pneumatic ball valve UNS19, a temperature measurement and control point TIS6, a pressure measurement and control point PSE6, a valve to be measured (12), a temperature measurement and control point TIS7, a pressure measurement and control point PSE7, a pneumatic ball valve UNS20 and a regulating valve UNW1 are provided in sequence on the refrigerant pipeline between the outlet end of the oil heater (8) and the second evaporator (10); a pneumatic ball valve UNS15 is connected in parallel between the air inlet end of the pneumatic ball valve UNS19 and the air inlet end of the pneumatic ball valve UNS20; a pneumatic ball valve UNS16 is connected in parallel between the air outlet end of the pneumatic ball valve UNS19 and the air outlet end of the pneumatic ball valve UNS20; and a temperature measurement and control point TIS5 and a pneumatic ball valve UNS14 are provided at the air outlet end of the second evaporator (10).

2. The device for testing R744 supercritical and subcritical valves according to claim 1, characterized in that: The air inlet end of the first-stage compressor (1) is provided with a pneumatic ball valve UNS1, and the air outlet end of the first-stage compressor (1) is provided with a temperature measurement and control point TWS2 and a pneumatic ball valve UNS2; the air inlet end of the second-stage compressor (2) is provided with a pneumatic ball valve UNS4 and a temperature measurement and control point TIS3, and the air outlet end of the second-stage compressor (2) is provided with a temperature measurement and control point TWS4 and a pneumatic ball valve UNS1; a pneumatic ball valve UNS25 is provided on the refrigerant pipeline at the air inlet end of the first air cooler (3); the refrigerant pipeline at the air inlet end of the first air cooler (3) is connected between the temperature measurement and control point TWS2 and the pneumatic ball valve UNS2; a pneumatic ball valve UNS26 is provided on the refrigerant pipeline at the air outlet end of the first air cooler (3); the refrigerant pipeline at the air outlet end of the first air cooler (3) is connected between the pneumatic ball valve UNS4 and the temperature measurement and control point TIS3.

3. The R744 supercritical and subcritical valve component testing device according to claim 2 is characterized in that: The gas outlet of the gas separator (5) is provided with a pressure measurement and control point PSE1 and a temperature measurement and control point TIS1; the oil return end of the oil separator (4) is connected to the first-stage compressor (1) and the second-stage compressor (2) respectively through two oil return pipelines.

4. The R744 supercritical and subcritical valve component testing device according to claim 3 is characterized in that: The parameters to be controlled for the performance test and the flow resistance test of the valve component (12) under test include the following: the pressure before the valve is controlled by the condenser (6) during the subcritical test and by the regulating valve UNW5 during the supercritical test; the temperature before the valve is controlled by the second air cooler (7) and the oil heater (8); wherein the outlet pressure during the performance test of the valve component (12) under test is controlled by the regulating valve UNW3; and the outlet pressure during the flow resistance test of the valve component (12) under test is controlled by the regulating valve UNW1.

5. The device for testing R744 supercritical and subcritical valves according to claim 4, characterized in that: When the valve is tested under the subcritical positive state, the first-stage compressor (1) and the second-stage compressor (2) are kept in parallel, and the pneumatic ball valve UNS13, the regulating valve UNW5, the pneumatic ball valve UNS15, and the pneumatic ball valve UNS16 are closed. The refrigerant enters the test assembly from the parallel compression assembly and flows in sequence through the pneumatic ball valve UNS28, the condenser (6), the liquid storage tank (11), the pneumatic ball valve UNS29, the second air cooler (7), the oil heater (8), the pneumatic ball valve UNS19, the temperature measurement and control point TIS6, the pressure measurement and control point PSE6, the valve under test (12), the temperature measurement and control point TIS7, the pressure measurement and control point PSE7, the pneumatic ball valve UNS20, the regulating valve UNW1, and the second evaporator (10) until the gas separator (5) completes a loop.

6. The device for testing R744 supercritical and subcritical valves according to claim 5, characterized in that: When the valve is tested under the subcritical reverse state, the first-stage compressor (1) and the second-stage compressor (2) are kept in parallel, and the pneumatic ball valve UNS13, the regulating valve UNW5, the pneumatic ball valve UNS19, and the pneumatic ball valve UNS20 are closed. The refrigerant enters the test assembly from the parallel compression assembly and flows in sequence through the pneumatic ball valve UNS28, the condenser (6), the liquid storage tank (11), the pneumatic ball valve UNS29, the second air cooler (7), the oil heater (8), the pneumatic ball valve UNS15, the pressure measurement and control point PSE7, the temperature measurement and control point TIS7, the valve under test (12), the pressure measurement and control point PSE6, the temperature measurement and control point TIS6, the pneumatic ball valve UNS16, the regulating valve UNW1, and the second evaporator (10) until the gas separator (5) completes a loop.

7. The device for testing R744 supercritical and subcritical valves according to claim 6, characterized in that: When the valve component is tested under the supercritical forward state, the first-stage compressor (1) and the second-stage compressor (2) are kept in parallel, and the pneumatic ball valve UNS28, the pneumatic ball valve UNS29, the pneumatic ball valve UNS15, and the pneumatic ball valve UNS16 are closed. After the refrigerant is discharged from the parallel compression assembly, it is divided into two liquid paths, in which the refrigerant in one liquid path flows in sequence through the regulating valve UNW5, the condenser (6), the liquid storage tank (11), and the first evaporator (9) until the gas component completes a circuit; the refrigerant in the other liquid path flows in sequence through the pneumatic ball valve UNS13, the second air cooler (7), the oil heater (8), the pneumatic ball valve UNS19, the temperature measurement and control point TIS6, the pressure measurement and control point PSE6, the valve component (12) under test, the temperature measurement and control point TIS7, the pressure measurement and control point PSE7, the pneumatic ball valve UNS20, the regulating valve UNW1, and the second evaporator (10) until the gas component (5) completes a circuit.

8. The R744 supercritical and subcritical valve component testing device according to claim 7 is characterized in that: When the valve component is tested under the supercritical forward state, the first-stage compressor (1) and the second-stage compressor (2) are kept in parallel, and the pneumatic ball valve UNS28, the pneumatic ball valve UNS29, the pneumatic ball valve UNS19, and the pneumatic ball valve UNS20 are closed. After the refrigerant is discharged from the parallel compression assembly, it is divided into two liquid paths, in which the refrigerant in one liquid path flows in sequence through the regulating valve UNW5, the condenser (6), the liquid storage tank (11), and the first evaporator (9) until the gas component completes a circuit; the refrigerant in the other liquid path flows in sequence through the pneumatic ball valve UNS13, the second air cooler (7), the oil heater (8), the pneumatic ball valve UNS15, the pressure measurement and control point PSE7, the temperature measurement and control point TIS7, the valve component (12) under test, the pressure measurement and control point PSE6, the temperature measurement and control point TIS6, the pneumatic ball valve UNS16, the regulating valve UNW1, and the second evaporator (10) until the gas component (5) completes a circuit.

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