Dynamic test cold plate and compressor test system

Abstract

This invention provides a dynamic cooling capacity test bench and a compressor testing system. The dynamic cooling capacity test bench includes a constant temperature and pressure gas supply system, a back pressure stabilization system, and a compressor testing module. The gas supply system independently controls the compressor's suction pressure and suction temperature, and includes a high-pressure gas source, an electric heating module, a filter, an electronic pressure controller, an intake temperature pretreatment module, an intake working chamber, and a first constant temperature bath circulation system. The back pressure stabilization system independently controls the compressor's discharge pressure, and includes an exhaust working chamber and an electronic back pressure regulator. The compressor testing module's intake end is connected to the gas supply system, and its discharge end is connected to the back pressure stabilization system. This invention employs two independent open systems to precisely control the compressor's suction pressure, suction temperature, and discharge pressure, achieving high-precision, fast-response boundary condition simulation and supporting the study of the compressor's dynamic response characteristics.

Description

Technical Field

[0001] This invention relates to the field of compressor testing, and more specifically, to a dynamic cooling capacity test bench and a compressor testing system. Background Technology

[0002] With the increasing popularity of variable frequency energy-saving technology, air conditioning systems and refrigeration compressors face higher dynamic performance requirements. In actual operation, the compressor speed changes frequently with load demand, and is also subject to dynamic disturbances from multiple factors such as ambient temperature and condenser heat dissipation conditions. Therefore, studying the dynamic response characteristics of compressors under variable speed and operating conditions is of vital importance for optimizing compressor design, improving system energy efficiency, and enhancing user comfort.

[0003] Existing compressor performance testing benches are generally built based on the calorimeter method, and their core design architecture is a thermal equilibrium closed-loop system. This system maintains a steady-state thermal equilibrium inside the calorimeter, that is, the compressor's cooling capacity is precisely equal to the electric heating capacity, and relies on the expansion valve opening, condenser air volume or cooling water flow rate to stabilize boundary conditions such as evaporation temperature and condensation temperature, thereby achieving high-precision measurement of cooling capacity under steady-state operating conditions.

[0004] However, this closed-loop design has a fundamental characteristic: the system possesses enormous thermal inertia. The water or air, working fluid, and metal components throughout the test loop collectively form a massive heat reservoir, exhibiting a significant "low-pass filtering" effect on transient processes. When attempting to change the compressor's operating conditions, this thermal inertia results in extremely slow temperature changes. Simultaneously, the control system's response speed lags significantly behind dynamic changes. The adjustment delays of actuators such as expansion valves and electronic expansion valves cause key boundary conditions such as suction superheat and suction / discharge pressure to deviate significantly from target values ​​during dynamic processes, leading to distorted test data and compromising test validity—meaning it cannot accurately reflect the compressor's instantaneous dynamic behavior. Therefore, this type of test bench is essentially a steady-state measurement device, rather than a dynamic analysis tool.

[0005] In view of the problems existing in the above-mentioned technologies, there is an urgent need for a compressor testing device that can simulate real dynamic working conditions, has high response speed and high boundary condition control accuracy, so as to support in-depth research on the dynamic response characteristics of compressors.

[0006] In view of this, the present invention provides a dynamic testing platform for cooling capacity and a compressor testing system. Summary of the Invention

[0007] In view of this, the present invention provides a dynamic cooling capacity test bench and a compressor test system to solve the problem that existing compressor performance test benches cannot be used for dynamic operating condition testing due to large system thermal inertia and slow response speed.

[0008] This invention provides a dynamic testing cold capacity stage, comprising: A constant temperature and pressure gas supply system, wherein the constant temperature and pressure gas supply system is configured to independently control the suction pressure and suction temperature of the compressor; A back pressure stabilizing system, configured to independently control the discharge pressure of the compressor; A compressor testing module is configured to accommodate and test a compressor. The inlet of the compressor testing module is connected to the constant temperature and pressure air supply system, and the outlet is connected to the back pressure stabilizing system. The constant temperature and pressure gas supply system, the back pressure stabilizing system, and the compressor test module together constitute a dynamic test loop.

[0009] Preferably, the constant temperature and pressure gas supply system includes: High-pressure air source; The electric heating module is connected to the high-pressure gas source; An electronic pressure controller, wherein the air inlet of the electronic pressure controller is connected to the electric heating module, and the electronic pressure controller adopts a downstream pressure control mode; An inlet air temperature pretreatment module, wherein the working fluid inlet of the inlet air temperature pretreatment module is connected to the outlet of the electronic pressure controller; An air intake working chamber, wherein the working fluid inlet of the air intake working chamber is connected to the working fluid outlet of the air intake temperature pretreatment module, and the working fluid outlet of the air intake working chamber is configured to connect to the air intake end of the compressor test module. The system includes a first constant temperature bath circulation system, comprising a first constant temperature bath, a first circulation pump, and pipelines. The first constant temperature bath is connected to the first circulation pump via pipelines. The pipeline at the outlet of the first circulation pump is connected to the constant temperature medium inlet of the intake air temperature pretreatment module and flows through the intake air temperature pretreatment module. A pipeline leading out from the constant temperature medium outlet of the intake air temperature pretreatment module is connected to the constant temperature medium inlet of the intake working chamber and passes through the intake working chamber. A pipeline leading out from the constant temperature medium outlet of the intake working chamber returns to the first constant temperature bath, forming a circulation loop.

[0010] Preferably, the constant temperature medium inlet of the air intake working chamber is located at the bottom of the air intake working chamber, and the constant temperature medium outlet of the air intake working chamber is located at the top of the air intake working chamber and at a diagonal position opposite to the constant temperature medium inlet. The pipeline is arranged in a serpentine pattern inside the air intake working chamber, so that the constant temperature medium forms a piston flow state from bottom to top.

[0011] Preferably, the constant temperature and pressure gas supply system further includes: The first shut-off valve is installed on the pipeline between the intake working chamber and the intake end of the compressor test module; A second pressure sensor and a second temperature sensor are disposed in the air intake working chamber, and the second pressure sensor is electrically connected to the electronic pressure controller. A filter is disposed between the electric heating module and the electronic pressure controller; A first pressure sensor and a first temperature sensor are disposed between the electric heating module and the filter.

[0012] Preferably, the back pressure stabilizing system includes: An exhaust working chamber, wherein the inlet end of the exhaust working chamber is configured to connect to the exhaust end of the compressor test module; An electronic back pressure regulator, wherein the inlet end of the electronic back pressure regulator is connected to the outlet end of the exhaust working chamber, and the outlet end of the electronic back pressure regulator is connected to a working fluid recovery device, and the electronic back pressure regulator adopts an upstream pressure control mode. The second shut-off valve is installed on the pipeline between the exhaust end of the compressor test module 3 and the exhaust working chamber; the exhaust working chamber is equipped with a third pressure sensor and a third temperature sensor, and the third pressure sensor is electrically connected to the electronic back pressure regulator.

[0013] Preferably, the compressor testing module includes: The second constant temperature bath circulation system is configured to control the ambient temperature of the compressor test module; A temperature and pressure test sensor assembly, comprising an intake pressure sensor and an intake temperature sensor disposed on the intake side of the compressor, an exhaust pressure sensor and an exhaust temperature sensor disposed on the exhaust side of the compressor, an oil sump temperature sensor disposed on the compressor body, a pump body temperature sensor, a motor temperature sensor, a housing temperature sensor, and an ambient temperature sensor for testing the ambient temperature of the compressor test module. A power testing device configured to test the power of a compressor; A flow meter, located after the oil separator of the compressor, is configured to test the mass flow rate of the working fluid in the compressor.

[0014] Preferably, the compressor testing module further includes: An oil separator, wherein the inlet of the oil separator is connected to the exhaust pipe of the compressor, the gas outlet of the oil separator is connected to the exhaust working chamber, and the oil outlet pipe of the oil separator is connected to the pipe between the liquid receiver and the cylinder of the compressor; The second constant temperature bath circulation system includes a second constant temperature bath, a second circulation pump, a heat exchanger, and pipelines. The second constant temperature bath is connected to the second circulation pump via pipelines. The pipeline at the outlet of the second circulation pump is connected to the constant temperature medium inlet of the heat exchanger. The constant temperature medium outlet of the heat exchanger is connected to the second constant temperature bath via pipelines, forming a circulation loop. The heat exchanger is located inside the compressor test module and is equipped with a fan to maintain the temperature uniformity inside the compressor test module. The ambient temperature sensor is located at the return air of the heat exchanger.

[0015] Preferably, the electronic pressure controller, the intake air temperature pretreatment module, the intake working chamber, the first constant temperature bath circulation system, and the first shut-off valve are all provided with an external heat insulation layer.

[0016] Preferably, the second constant temperature bath circulation system, compressor, oil separator, power testing device, flow meter, and temperature and pressure testing sensor assembly are all installed inside the insulated box.

[0017] The present invention also provides a compressor testing system, including the dynamic cooling capacity test bench as described above.

[0018] The dynamic cooling capacity test bench and compressor test system of this invention employ two independent open systems to precisely control the compressor's suction pressure, suction temperature, and discharge pressure, achieving high-precision, fast-response boundary condition simulation and ensuring that the boundary conditions remain constant under dynamic changes. This provides a comprehensive solution with high precision, high reliability, and high response speed for dynamic performance testing of different types of compressors under varying operating conditions. Specifically, the two independent open systems—a constant temperature and pressure gas supply system and a back pressure stabilization system—independently control the compressor's suction boundary (pressure, temperature) and discharge boundary (pressure). The gas supply system uses a downstream control mode of an electronic pressure controller, combined with a "downstream extraction, upstream pressure replenishment" mechanism, to compensate for flow fluctuations under dynamic operating conditions in real time, ensuring a highly constant suction pressure. Simultaneously, through a two-stage heat exchange between the intake temperature pretreatment module and the intake working chamber, the suction temperature is ensured to be infinitely close to the set value. The back pressure stabilization system uses an electronic back pressure regulator to automatically adjust the valve opening through real-time pressure feedback, precisely maintaining a constant discharge pressure. Therefore, when the compressor speed changes dynamically, its suction temperature, suction pressure, and discharge pressure remain constant at the set state, providing accurate and stable boundary conditions for the study of dynamic response characteristics. Furthermore, by introducing a feedforward control strategy into the controller, when a change in compressor speed or power is detected, the system pre-calculates and adjusts the control parameters of the electronic back pressure regulator and electronic pressure controller, avoiding boundary condition fluctuations caused by control lag and significantly improving the system's accuracy under dynamic operating conditions. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the dynamic testing cold energy stage in the first embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the constant temperature and pressure gas supply system in the first embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the back pressure stabilizing system in the first embodiment of the present invention.

[0023] Figure 4 This is a schematic diagram of the compressor test module in the first embodiment of the present invention.

[0024] Figure 5 This is a partial structural diagram of the compressor testing module in the first embodiment of the present invention.

[0025] Figure Labels

[0026] 1. Constant temperature and pressure gas supply system

[0027] 10 First Circulation Pump

[0028] 11 High-pressure air source

[0029] 12 Electric heating modules

[0030] 13 Filters

[0031] 14 Electronic pressure controller

[0032] 15. Intake Air Temperature Pretreatment Module

[0033] 16. Intake working chamber

[0034] 18 First shut-off valve

[0035] 19 The first constant temperature bath

[0036] 2 Back pressure stabilizing system

[0037] 21 Exhaust working chamber

[0038] 22 Electronic back pressure regulator

[0039] 23 Second shut-off valve

[0040] 3. Compressor Test Module

[0041] 32 Second constant temperature bath

[0042] 33 Second Circulation Pump

[0043] 34 Compressor

[0044] 35 Oil separator

[0045] 36 Heat exchanger

[0046] 37 Flowmeter

[0047] P power testing device

[0048] p1 First pressure sensor

[0049] T1 First Temperature Sensor

[0050] p2 Second pressure sensor

[0051] T2 Second Temperature Sensor

[0052] p3 Third pressure sensor

[0053] T3 Third Temperature Sensor

[0054] T4 Ambient Temperature Sensor

[0055] p4 Inhalation pressure sensor

[0056] T9 Intake Temperature Sensor

[0057] p5 Exhaust Pressure Sensor

[0058] T10 Exhaust Temperature Sensor

[0059] T5 oil sump temperature sensor

[0060] T6 Pump Body Temperature Sensor

[0061] T7 Motor Temperature Sensor

[0062] T8 Case Temperature Sensor Detailed Implementation

[0063] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0064] The use of terms such as "first," "second," and similar terms in the specific description does not indicate any order, quantity, or importance, but is merely used to distinguish different components. Furthermore, in the description of this invention, terms such as "upper," "lower," etc., indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention.

[0065] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features in different embodiments can be combined with each other.

[0066] Figure 1 This is a schematic diagram of the overall structure of the dynamic testing cold energy stage in the first embodiment of the present invention. Figure 2 This is a schematic diagram of the constant temperature and pressure gas supply system in the first embodiment of the present invention. Figure 3 This is a schematic diagram of the back pressure stabilizing system in the first embodiment of the present invention. Figure 4 This is a schematic diagram of the compressor test module in the first embodiment of the present invention. Figure 5 This is a partial structural diagram of the compressor testing module in the first embodiment of the present invention. (See diagram below.) Figures 1 to 5 As shown, the dynamic cooling capacity test bench of the present invention includes a constant temperature and pressure air supply system 1, a back pressure stabilizing system 2, and a compressor test module 3. The constant temperature and pressure air supply system 1 is configured to independently control the suction pressure and suction temperature of the compressor. The back pressure stabilizing system 2 is configured to independently control the discharge pressure of the compressor. The compressor test module 3 is configured to accommodate a compressor 34 and to test the compressor 34. The inlet end of the compressor test module 3 is connected to the constant temperature and pressure air supply system 1, and the discharge end of the compressor test module 3 is connected to the back pressure stabilizing system 2. The constant temperature and pressure air supply system 1, the back pressure stabilizing system 2, and the compressor test module 3 together constitute a dynamic test loop. The present invention, by using two independent open systems to control the suction and discharge boundaries of the compressor respectively, abandons the closed-loop thermal balance mode of the traditional calorimeter method, eliminates the problems of thermal inertia and control lag of the closed-loop system, and enables the cooling capacity test bench to quickly respond to the dynamic changes of the compressor, supporting real-time performance testing of the compressor under dynamic operating conditions such as sudden changes in speed and load. Meanwhile, the constant temperature and pressure air supply system 1 and the back pressure stabilizing system 2 are independent of each other, so that the intake pressure and exhaust pressure can be controlled independently without interference, providing accurate and stable boundary conditions for dynamic testing.

[0067] In a preferred embodiment, the constant temperature and pressure gas supply system 1 includes: a high-pressure gas source 11, an electric heating module 12, an electronic pressure controller 14, an inlet air temperature pretreatment module 15, an inlet working chamber 16, and a first constant temperature bath circulation system. The electric heating module 12 is connected to the high-pressure gas source 11. The inlet end of the electronic pressure controller 14 is connected to the electric heating module 12, and the electronic pressure controller 14 adopts a downstream pressure control mode. The working fluid inlet of the inlet air temperature pretreatment module 15 is connected to the outlet end of the electronic pressure controller 14. The working fluid inlet of the inlet working chamber 16 is connected to the working fluid outlet of the inlet air temperature pretreatment module 15, and the working fluid outlet of the inlet working chamber 16 is configured to connect to the inlet end of the compressor test module 3, i.e., the inlet of the liquid reservoir of the compressor 34. The first constant temperature bath circulation system includes a first constant temperature bath 19, a first circulation pump 10, and pipelines. The first thermostatic bath 19 is connected to the first circulating pump 10 via a pipeline. The pipeline from the outlet of the first circulating pump 10 is connected to the thermostatic medium inlet of the intake air temperature pretreatment module 15 and flows through the intake air temperature pretreatment module 15. The pipeline leading out from the thermostatic medium outlet of the intake air temperature pretreatment module 15 is connected to the thermostatic medium inlet of the intake working chamber 16 and passes through the intake working chamber 16. The pipeline leading out from the thermostatic medium outlet of the intake working chamber 16 returns to the first thermostatic bath 19, forming a circulation loop.

[0068] In this embodiment, the high-pressure gas source 11 provides driving potential energy to overcome system flow resistance and maintain flow compensation capability when the downstream gas extraction volume changes, achieving rapid response. The electronic pressure controller 14 adopts a downstream pressure control mode, collects downstream pressure signals in real time, and automatically adjusts the valve opening according to the downstream pressure changes to control the intake flow from the gas source to the working chamber, achieving a dynamic balance of "downstream gas extraction and upstream pressure replenishment" to ensure a highly constant suction pressure. The first constant temperature bath circulation system provides a stable constant temperature medium for the intake temperature pretreatment module 15 and the intake working chamber 16. Through two-stage heat exchange, it ensures that the temperature of the supplementary gas is infinitely close to the set temperature before entering the compressor, meeting the control accuracy requirements.

[0069] In a preferred embodiment, the constant temperature medium inlet of the intake working chamber 16 is located at the bottom of the intake working chamber 16, and the constant temperature medium outlet of the intake working chamber 16 is located at the top of the intake working chamber 16 and at a diagonal position opposite to the constant temperature medium inlet. The pipeline is arranged in a serpentine pattern inside the intake working chamber 16, so that the constant temperature medium forms a piston flow state from bottom to top.

[0070] In this embodiment, by setting the inlet of the constant temperature medium at the bottom and the outlet at the top diagonal position, and using a serpentine pipeline arrangement, the constant temperature medium forms a piston flow state from bottom to top, ensuring that the constant temperature medium flows uniformly throughout the working chamber, avoiding temperature deviation in the working chamber caused by insufficient local heat exchange, and thus ensuring that the temperature of the working gas medium inside the working chamber is uniform and constant at the set value.

[0071] In a preferred embodiment, the constant temperature and pressure gas supply system 1 further includes: a first shut-off valve 18, a second pressure sensor p2, a second temperature sensor T2, a filter 13, a first pressure sensor p1, and a first temperature sensor T1. The first shut-off valve 18 is disposed on the pipeline between the air intake working chamber 16 and the air intake end of the compressor test module 3, i.e., the air intake port of the liquid receiver of the compressor 34. The second pressure sensor p2 and the second temperature sensor T2 are disposed in the air intake working chamber 16, and the second pressure sensor p2 is electrically connected to the electronic pressure controller 14. The filter 13 is disposed between the electric heating module 12 and the electronic pressure controller 14. The first pressure sensor p1 and the first temperature sensor T1 are disposed between the electric heating module 12 and the filter 13.

[0072] In this embodiment, the first shut-off valve 18 is used for isolation and leak detection after system shutdown, improving system safety and maintainability. The second pressure sensor p2 provides real-time pressure feedback signals to the electronic pressure controller 14, forming a closed-loop control to ensure that the intake pressure is accurately and stably maintained at the set value. The filter 13 filters impurities in the working fluid, ensuring accurate control and long-term reliable operation of the electronic pressure controller 14. The first pressure sensor p1 and the first temperature sensor T1 are used to monitor the state of the working fluid after the electric heating module 12 in order to adjust the electric heating amount and ensure that the working fluid has a superheat of 5~10℃.

[0073] In a preferred embodiment, the back pressure stabilization system 2 includes: an exhaust working chamber 21, an electronic back pressure regulator 22, and a second shut-off valve 23. The inlet of the exhaust working chamber 21 is configured to connect to the exhaust end of the compressor test module 3. The inlet of the electronic back pressure regulator 22 is connected to the outlet of the exhaust working chamber 21, and the outlet of the electronic back pressure regulator 22 is connected to a working fluid recovery device. The electronic back pressure regulator 22 employs an upstream pressure control mode. The second shut-off valve 23 is located on the pipeline between the exhaust end of the compressor test module 3 and the exhaust working chamber 21. A third pressure sensor p3 and a third temperature sensor T3 are installed on the exhaust working chamber 21, and the third pressure sensor p3 is electrically connected to the electronic back pressure regulator 22.

[0074] In this embodiment, the electronic back pressure regulator 22 adopts an upstream pressure control mode, which collects the pressure signal of the exhaust working chamber 21 in real time and automatically adjusts the valve opening according to the pressure feedback to accurately maintain a constant upstream pressure. This adapts to the continuous and variable exhaust flow operating mode, ensuring that the exhaust pressure remains constant under dynamic operating conditions. The third pressure sensor p3 provides real-time pressure feedback signals to the electronic back pressure regulator 22, forming a closed-loop control. The second shut-off valve 23 is used for isolation and leak detection after system shutdown, improving the system's safety and maintainability.

[0075] In a preferred embodiment, the compressor test module 3 includes: a second constant-temperature bath circulation system, a temperature and pressure test sensor assembly, a power test device P, and a flow meter 37. The second constant-temperature bath circulation system is configured to control the ambient temperature of the compressor test module 3. The temperature and pressure test sensor assembly includes a suction pressure sensor p4 and a suction temperature sensor T9 disposed on the suction side of the compressor, a discharge pressure sensor p5 and a discharge temperature sensor T10 disposed on the discharge side of the compressor, an oil sump temperature sensor T5 disposed on the compressor body, a pump body temperature sensor T6, a motor temperature sensor T7, a casing temperature sensor T8, and an ambient temperature sensor T4 for testing the ambient temperature of the compressor test module 3. The power test device P is configured to test the power of the compressor. The flow meter 37 is disposed after the oil separator of the compressor and is configured to test the working fluid mass flow rate of the compressor.

[0076] In this embodiment, by setting up a comprehensive set of temperature and pressure testing sensor components, a power testing device, and a flow meter, various performance parameters of the compressor under dynamic operating conditions can be monitored in real time, including suction state, discharge state, temperature of various parts of the compressor, power, and working fluid flow rate, providing complete and accurate data support for the dynamic performance evaluation of the compressor. The second constant temperature bath circulation system ensures that the ambient temperature of the compressor testing module 3 is constant, improving the accuracy and repeatability of the test.

[0077] In a preferred embodiment, the compressor test module 3 further includes an oil separator 35, the inlet of which is connected to the compressor's exhaust pipe, the gas outlet of which is connected to the exhaust working chamber 21, and the oil outlet pipe of which is connected to the pipe between the compressor's receiver and cylinder. The second constant-temperature bath circulation system includes a second constant-temperature bath 32, a second circulation pump 33, a heat exchanger 36, and piping. The second constant-temperature bath 32 is connected to the second circulation pump 33 via piping, the outlet pipe of the second circulation pump 33 is connected to the constant-temperature medium inlet of the heat exchanger 36, and the constant-temperature medium outlet of the heat exchanger 36 is connected to the second constant-temperature bath 32 via piping, forming a circulation loop. The heat exchanger 36 is located inside the compressor test module 3 and includes a fan to maintain temperature uniformity within the compressor test module 3. An ambient temperature sensor T4 is located at the return air outlet of the heat exchanger 36.

[0078] In this embodiment, the oil separator 35 separates the lubricating oil discharged from the compressor and returns it to the compressor, ensuring normal lubrication of the compressor and preventing lubricating oil from entering subsequent pipelines and affecting test accuracy. The second constant temperature bath circulation system, through the cooperation of the heat exchanger 36 and the fan, achieves a uniform temperature distribution inside the compressor test module 3, avoiding the influence of local temperature differences on the test results. The ambient temperature sensor T4 is set at the return air of the heat exchanger 36, which can accurately reflect the average temperature inside the test module and provide accurate feedback for temperature control.

[0079] In a preferred embodiment, the electronic pressure controller 14, the intake air temperature pretreatment module 15, the intake working chamber 16, the first constant temperature bath circulation system, and the first shut-off valve 18 are all provided with an external insulation layer. In this embodiment, the external insulation layer effectively reduces the thermal interference of the external environment on the constant temperature and pressure air supply system, reduces the system's heat loss, improves the accuracy and stability of temperature control, and also helps to reduce energy consumption.

[0080] In a preferred embodiment, the second constant temperature bath circulation system, compressor 34, oil separator 35, power testing device P, flow meter 37, and temperature and pressure testing sensor assembly are all housed inside the insulated box.

[0081] In this embodiment, the insulation box effectively reduces the thermal interference of the external environment on the compressor test module, ensuring the stability and consistency of the test environment and improving the accuracy and repeatability of the test data.

[0082] This embodiment provides a compressor testing system, including the aforementioned dynamic cooling capacity test bench. The specific structure and technical features of the dynamic cooling capacity test bench are described above and will not be repeated here. The compressor testing system in this embodiment, including the dynamic cooling capacity test bench, can provide a comprehensive solution with high precision, high reliability, and high response speed for dynamic performance testing of different types of compressors under varying operating conditions. This system can be widely used in R&D testing and product verification in the fields of refrigeration and air conditioning, and compressor technology.

[0083] The specific embodiments of the present invention are as follows: refer to Figures 1 to 5 In this preferred embodiment, a cooling capacity test bench suitable for dynamic testing is provided. This test bench is specifically designed for dynamic performance testing of compressors and can achieve high-precision, fast-response boundary condition simulation. The cooling capacity test bench consists of three core components: a constant temperature and pressure gas supply system 1, a back pressure stabilization system 2, and a compressor testing module 3. These three components together form a complete dynamic test loop. Each system will be described in detail below.

[0084] See Figure 1 and Figure 2 The constant temperature and pressure air supply system 1 is configured to independently control the suction pressure and suction temperature of the compressor. This system adopts an open architecture, eliminating the thermal inertia problem of traditional closed-loop systems and enabling rapid response to dynamic changes in the compressor. Specifically, the constant temperature and pressure air supply system 1 includes a high-pressure air source 11, an electric heating module 12, a filter 13, an electronic pressure controller 14, an intake air temperature pretreatment module 15, an intake working chamber 16, a first constant temperature bath circulation system, a first shut-off valve 18, and related sensor components.

[0085] The high-pressure gas source 11 is used to provide driving potential energy, overcome system flow resistance, achieve rapid response, and maintain flow compensation capability when the downstream pumping volume changes. The high-pressure gas source 11 can be any working fluid source that can provide a stable high-pressure working fluid, and its outlet pressure should be sufficient to overcome the flow resistance of the entire gas supply system to ensure that the set suction pressure can still be maintained under maximum flow conditions.

[0086] The electric heating module 12 is connected to the high-pressure gas source 11 and is used to heat the working fluid flowing out of the high-pressure gas source. To prevent the working fluid from liquefying, it should be heated to a superheated state. However, the superheat cannot be too high, otherwise the compressor exhaust temperature will be too high, which does not conform to the actual operating state of the compressor in an air conditioner. Therefore, the electric heating module 12 is configured to heat the working fluid to a superheat of 5~10℃. The heating power of the electric heating module 12 can be adjusted according to the feedback signals from the first pressure sensor p1 and the first temperature sensor T1.

[0087] The filter 13 is located between the electric heating module 12 and the electronic pressure controller 14 to filter impurities and particulate matter in the working fluid, ensuring the precise control and long-term reliable operation of the electronic pressure controller 14.

[0088] The inlet of the electronic pressure controller 14 is connected to the electric heating module 12, employing a downstream pressure control mode. The electronic pressure controller 14 is a precision control element capable of automatically adjusting the valve opening based on the downstream pressure signal. In this embodiment, the electronic pressure controller 14 is configured to control the pressure downstream of it (i.e., the inlet working chamber 16 side). Specifically, the electronic pressure controller 14 acquires the pressure signal of the inlet working chamber 16 measured by the second pressure sensor p2 in real time, compares it with the set suction pressure value ps, and automatically adjusts the opening of its internal valve to control the intake flow from the high-pressure air source 11 to the inlet working chamber 16, ensuring that the pressure in the inlet working chamber 16 is always equal to ps. This "downstream suction, upstream pressure replenishment" working mode ensures that regardless of changes in the compressor's suction volume, the electronic pressure controller 14 can achieve dynamic pressure balance while resisting negative pressure effects.

[0089] The working fluid inlet of the inlet temperature pretreatment module 15 is connected to the outlet of the electronic pressure controller 14. The inlet temperature pretreatment module 15 is a heat exchanger used to pre-treat the temperature of the gas entering the system. The gas from the electronic pressure controller 14 first enters the inlet temperature pretreatment module 15 and exchanges heat with the isothermal medium from the first isothermal bath circulation system, so that the gas temperature initially approaches the set temperature Tset.

[0090] The working fluid inlet of the intake working chamber 16 is connected to the working fluid outlet of the intake temperature pretreatment module 15. The working fluid outlet of the intake working chamber 16 is configured to connect to the intake end of the compressor test module 3, i.e., the inlet of the liquid reservoir of the compressor 34. As the core area for gas storage and action, the temperature uniformity and stability of the intake working chamber 16 directly affect the accuracy of the intake temperature control. A serpentine arrangement of pipes is provided inside the intake working chamber 16. The constant temperature medium flows through these pipes and undergoes secondary heat exchange with the gas in the working chamber, ensuring that the gas temperature is further close to the set temperature Tset.

[0091] See Figure 2 The thermostatic medium inlet of the intake working chamber 16 is located at the bottom of the chamber, and the thermostatic medium outlet is located at the top of the chamber, diagonally opposite the inlet. This arrangement, with the inlet at the bottom and the outlet at the top, combined with the serpentine arrangement of the piping inside the intake working chamber 16, creates a bottom-up "piston flow" for the thermostatic medium. This flow pattern ensures uniform flow of the thermostatic medium throughout the working chamber, preventing temperature deviations caused by insufficient local heat exchange.

[0092] The first constant-temperature bath circulation system includes a first constant-temperature bath 19, a first circulation pump 10, and piping. The first constant-temperature bath 19 contains a constant-temperature medium (such as water or heat transfer oil) and is equipped with heating and cooling devices to precisely control the constant-temperature medium at a set temperature. The first constant-temperature bath 19 is connected to the first circulation pump 10 via piping. The piping at the outlet of the first circulation pump 10 connects to the constant-temperature medium inlet of the inlet air temperature pretreatment module 15 and flows through the inlet air temperature pretreatment module 15. A piping leading from the constant-temperature medium outlet of the inlet air temperature pretreatment module 15 connects to the constant-temperature medium inlet of the inlet working chamber 16 and passes through a serpentine pipe inside the inlet working chamber 16. The piping leading from the constant-temperature medium outlet of the inlet working chamber 16 returns to the first constant-temperature bath 19, forming a complete circulation loop. The first circulation pump 10 is configured to overcome flow resistance, ensuring that the flow velocity of the constant-temperature medium in the circulation pipe is greater than 1 m / s, achieving efficient heat exchange and rapidly removing or replenishing heat.

[0093] The first shut-off valve 18 is installed on the pipeline between the air intake working chamber 16 and the air intake end of the compressor test module 3, i.e. the air intake port of the liquid receiver of the compressor 34, for isolation and leak detection after the system is shut down.

[0094] In terms of sensor configuration, the constant temperature and pressure air supply system 1 includes: a first pressure sensor p1 and a first temperature sensor T1 disposed between the electric heating module 12 and the filter 13, for monitoring the working fluid state after the electric heating module 12 in order to adjust the electric heating amount; a second pressure sensor p2 and a second temperature sensor T2 disposed on the air intake working chamber 16, wherein the second pressure sensor p2 is electrically connected to the electronic pressure controller 14 for providing pressure feedback signal, and the second temperature sensor T2 is electrically connected to the first constant temperature bath circulation system for providing temperature feedback signal to achieve a constant air intake working chamber temperature.

[0095] To reduce external thermal interference, the electronic pressure controller 14, the intake air temperature pretreatment module 15, the intake working chamber 16, the first constant temperature bath circulation system, and the first shut-off valve 18 are each equipped with an external insulation layer. Alternatively, the electronic pressure controller 14, the intake air temperature pretreatment module 15, the intake working chamber 16, the first constant temperature bath circulation system, and the first shut-off valve 18 are all housed inside a large first insulation chamber.

[0096] See Figure 1 and Figure 3 The back pressure stabilizing system 2 is configured to independently control the compressor's discharge pressure. This system employs an open architecture, enabling it to adapt to continuous and variable discharge flow modes, ensuring a constant system inlet pressure even with continuous and variable flow of external air. Specifically, the back pressure stabilizing system 2 includes an exhaust working chamber 21, an electronic back pressure regulator 22, a second shut-off valve 23, and related sensor components.

[0097] The inlet of the exhaust working chamber 21 is configured to connect to the exhaust end of the compressor test module 3, i.e., the gas outlet of the oil separator 35. The exhaust working chamber 21 is used to maintain a constant exhaust pressure, and its internal volume is optimized to buffer the pulsating airflow from the compressor, providing a stable upstream pressure for the electronic back pressure regulator 22.

[0098] The inlet of the electronic back pressure regulator 22 is connected to the outlet of the exhaust working chamber 21, and the outlet of the electronic back pressure regulator 22 is connected to the working fluid recovery device (such as a condenser or a liquid storage tank). The electronic back pressure regulator 22 adopts an upstream pressure control mode, that is, by acquiring the pressure signal of the exhaust working chamber 21 in real time, it automatically adjusts the valve opening according to the pressure feedback to accurately maintain a constant pressure upstream (on the exhaust working chamber 21 side). Specifically, the electronic back pressure regulator 22 acquires the pressure signal of the exhaust working chamber 21 measured by the third pressure sensor p3 in real time, compares it with the set exhaust pressure value pd, and automatically adjusts the opening of its internal valve to control the gas flow from the exhaust working chamber 21 to the working fluid recovery device, so that the pressure of the exhaust working chamber 21 is always equal to pd. Regardless of the change in the compressor's exhaust volume, the electronic back pressure regulator 22 can achieve dynamic balance of the upstream pressure.

[0099] The second shut-off valve 23 is installed on the pipeline between the gas outlet of the oil separator 35 and the exhaust working chamber 21 at the exhaust end of the compressor test module 3, and is used for isolation and leak detection after the system is shut down.

[0100] The exhaust working chamber 21 is equipped with a third pressure sensor p3 and a third temperature sensor T3. The third pressure sensor p3 is electrically connected to the electronic back pressure regulator 22 and is used to provide pressure feedback signals.

[0101] See Figure 1 , Figure 4 and Figure 5 The compressor test module 3 is configured to accommodate and test the compressor 34. The inlet of the compressor test module 3 is connected to the constant temperature and pressure air supply system 1 (specifically connected to the working fluid outlet of the inlet working chamber 16), and the outlet is connected to the back pressure stabilizing system 2 (specifically connected to the exhaust working chamber 21 via the oil separator 35). The compressor test module 3 includes a second constant temperature bath circulation system, temperature and pressure test sensor components, a power test device P, a flow meter 37, and an oil separator 35.

[0102] The operation of the second constant-temperature bath circulation system is controlled by the test value of the ambient temperature sensor T4, thereby maintaining the ambient temperature at the set value. The second constant-temperature bath circulation system includes a second constant-temperature bath 32, a second circulation pump 33, a heat exchanger 36, and piping. The second constant-temperature bath 32 contains a constant-temperature medium and is equipped with heating and cooling devices, which can accurately control the constant-temperature medium at the set temperature. The second constant-temperature bath 32 is connected to the second circulation pump 33 via piping. The piping at the outlet of the second circulation pump 33 is connected to the constant-temperature medium inlet of the heat exchanger 36, and the constant-temperature medium outlet of the heat exchanger 36 is connected to the second constant-temperature bath 32 via piping, forming a circulation loop. The heat exchanger 36 is located inside the compressor test module 3 and is equipped with a fan. The fan forces air circulation, allowing the constant-temperature medium to exchange heat with the air inside the test module, maintaining the temperature uniformity inside the compressor test module 3. The ambient temperature sensor T4 is located at the return air of the heat exchanger 36 to accurately reflect the temperature inside the test module, providing precise feedback for temperature control.

[0103] The temperature and pressure testing sensor assembly includes: a suction pressure sensor p4 and a suction temperature sensor T9 located on the compressor suction side to measure the compressor suction pressure and suction temperature; a discharge pressure sensor p5 and a discharge temperature sensor T10 located on the compressor discharge side to measure the compressor discharge pressure and discharge temperature; and an oil sump temperature sensor T5, a pump body temperature sensor T6, a motor temperature sensor T7, and a casing temperature sensor T8 located on the compressor body to monitor the temperature of various critical components of the compressor. All temperature sensors have sufficiently high response speeds to capture temperature and pressure changes under dynamic operating conditions.

[0104] The power testing device P is configured to test the power of the compressor. The power testing device P can be a high-precision power analyzer capable of measuring the compressor's input voltage, current, and power factor in real time, and calculating the compressor's input power.

[0105] Flow meter 37 is located after the oil separator 35 of the compressor (i.e., between the gas outlet of the oil separator 35 and the exhaust working chamber 21) and is configured to test the working fluid mass flow rate of the compressor. Flow meter 37 is a high-precision mass flow meter that can measure the mass flow rate of the working fluid in real time, providing key data for compressor performance calculations.

[0106] The inlet of oil separator 35 is connected to the compressor's exhaust pipe, and the gas outlet of oil separator 35 is connected to the exhaust working chamber 21. The oil outlet pipe of oil separator 35 is connected to the pipe between the compressor's liquid receiver and cylinder. Oil separator 35 separates the lubricating oil discharged from the compressor and returns it to the compressor through the oil outlet pipe, ensuring normal lubrication of the compressor and preventing lubricating oil from entering subsequent pipes and affecting test accuracy.

[0107] To reduce external thermal interference, the second constant temperature bath circulation system, compressor 34, oil separator 35, power testing device P, flow meter 37, and temperature and pressure testing sensor assembly are all installed inside the second insulation cavity.

[0108] This implementation scheme also includes an advanced control system (not shown in the figure) that implements a feedforward-feedback composite control strategy.

[0109] In terms of feedback control: the controller collects the intake working chamber pressure (pressure value of the second pressure sensor p2) and the set pressure ps, and performs closed-loop feedback control on the electronic pressure controller 14; the controller collects the exhaust working chamber pressure (pressure value of the third pressure sensor p3) and the set pressure pd, and performs closed-loop feedback control on the electronic back pressure regulator 22; the controller collects the intake working chamber temperature (temperature value of the second temperature sensor T2) and the set temperature Tset, and performs closed-loop feedback control on the first constant temperature bath circulation system; the controller collects the test module temperature (temperature value of the ambient temperature sensor T4) and the set temperature Ttset, and performs closed-loop feedback control on the second constant temperature bath circulation system.

[0110] In terms of feedforward control: when a change in compressor speed or power is detected, the controller provides an estimated adjustment to the electronic back pressure regulator 22 and the electronic pressure controller 14 in advance, instead of relying solely on pressure feedback for pure closed-loop regulation. This feedforward-feedback composite control strategy significantly improves the system's response speed and accuracy under dynamic operating conditions, avoiding boundary condition fluctuations caused by control lag.

[0111] The working process of the dynamic testing cold air stage in this implementation plan is as follows: Before the test begins, the test conditions are first set: intake pressure ps, intake temperature Tset, exhaust pressure pd, and ambient temperature of the test module Ttset. Then, the first and second constant temperature bath circulation systems are started to bring each system to the set temperature conditions.

[0112] After the test begins, the working fluid from the high-pressure gas source 11 first passes through the electric heating module 12. The electric heating module 12 adjusts the heating power according to the feedback signals from the first pressure sensor p1 and the first temperature sensor T1 to ensure that the working fluid has a superheat of 5~10℃. After being heated, the working fluid is filtered through the filter 13 and then enters the electronic pressure controller 14. The electronic pressure controller 14 automatically adjusts the valve opening according to the pressure signal of the intake working chamber 16 fed back by the second pressure sensor p2, so that the pressure of the intake working chamber 16 is stabilized at the set value ps.

[0113] The gas flowing out from the electronic pressure controller 14 sequentially enters the inlet temperature pretreatment module 15 and the inlet working chamber 16. In the first constant temperature bath circulation system, the constant temperature medium circulates within the inlet temperature pretreatment module 15 and the inlet working chamber 16, undergoing two-stage heat exchange with the gas, so that the gas temperature is infinitely close to the set temperature Tset before entering the compressor. The gas, after precise temperature and pressure control, enters the suction port of the compressor 34 through the first shut-off valve 18.

[0114] After compressor 34 starts, the mixture of high-temperature, high-pressure gaseous working fluid and lubricating oil discharged from its exhaust port enters oil separator 35. Oil separator 35 separates the lubricating oil and returns it to the compressor through the oil outlet pipeline. The gaseous working fluid after oil separation enters the exhaust working chamber 21 through the second shut-off valve 23. The third pressure sensor p3 on the exhaust working chamber 21 measures the pressure in the chamber in real time. The electronic back pressure regulator 22 automatically adjusts the valve opening according to the pressure signal to stabilize the pressure in the exhaust working chamber 21 at the set value pd. The gas flowing out of the electronic back pressure regulator 22 enters the subsequent working fluid recovery device.

[0115] Throughout the testing process, the temperature and pressure sensor assembly monitored various performance parameters of the compressor in real time: suction pressure sensor P4 and suction temperature sensor T9 measured the suction status; discharge pressure sensor P5 and discharge temperature sensor T10 measured the discharge status; oil sump temperature sensor T5, pump body temperature sensor T6, motor temperature sensor T7, and casing temperature sensor T8 monitored the temperature of various parts of the compressor; power testing device P measured the compressor power; and flow meter 37 measured the working fluid mass flow rate. All data was acquired in real time and transmitted to the control system for analysis and processing.

[0116] When the compressor speed changes, the control system uses a feedforward-feedback composite control strategy to make advance adjustments to the electronic pressure controller 14 and the electronic back pressure regulator 22 to ensure that the intake pressure and exhaust pressure remain constant during the dynamic process.

[0117] This specific implementation scheme fully embodies the core technical concept of the present invention. This dynamic testing cold capacity stage successfully resolves the long-standing contradiction between "insufficient dynamic testing capability" and "low boundary condition control accuracy" in existing technologies. Through creative functional decomposition and re-integration, it achieves independent control of the intake and exhaust boundaries, high response speed of the open system architecture, high-precision temperature control of the two-stage heat exchange, and high dynamic accuracy of the feedforward-feedback composite control, ultimately achieving excellent comprehensive performance with high testing accuracy, fast response speed, stable boundary conditions, and high testing efficiency.

[0118] In summary, the dynamic testing platform of this invention successfully solves the problem that existing compressor performance testing platforms cannot be used for dynamic operating condition testing due to large system thermal inertia and slow response speed. By creatively employing two independent open systems to control the compressor's suction and discharge boundaries respectively, it abandons the closed-loop thermal balance mode of the traditional calorimeter method and eliminates the "low-pass filtering" effect of system thermal inertia on dynamic testing. Specifically, the gas supply system adopts the downstream control mode of an electronic pressure controller, combined with a "downstream extraction, upstream pressure replenishment" mechanism, which can compensate for flow fluctuations under dynamic operating conditions in real time, ensuring a highly constant suction pressure. Simultaneously, through the intake temperature pretreatment module and the two-stage heat exchange of the intake working chamber, as well as the piston flow design, it ensures that the suction temperature is infinitely close to the set value. The back pressure stabilization system adopts the upstream pressure control mode of an electronic back pressure regulator, automatically adjusting the valve opening through real-time pressure feedback to accurately maintain a constant discharge pressure. The introduction of the feedforward-feedback composite control strategy avoids boundary condition fluctuations caused by control lag, significantly improving the system's accuracy under dynamic operating conditions.

[0119] The above description, in conjunction with specific optional embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A dynamic testing stage for cold energy, characterized in that, include: A constant temperature and pressure gas supply system (1) is configured to independently control the suction pressure and suction temperature of the compressor; A back pressure stabilizing system (2) is configured to independently control the discharge pressure of the compressor; The compressor test module (3) is configured to accommodate the compressor (34) and to test the compressor (34). The inlet end of the compressor test module (3) is connected to the constant temperature and pressure air supply system (1), and the outlet end of the compressor test module (3) is connected to the back pressure stabilizing system (2). The constant temperature and pressure gas supply system (1), the back pressure stabilizing system (2), and the compressor test module (3) together constitute a dynamic test circuit.

2. The dynamic testing cold energy stage according to claim 1, characterized in that, The constant temperature and pressure gas supply system (1) includes: High-pressure gas source (11); An electric heating module (12) is connected to the high-pressure gas source (11); An electronic pressure controller (14) is provided, the air inlet of which is connected to the electric heating module (12), and the electronic pressure controller (14) adopts a downstream pressure control mode. An inlet temperature pretreatment module (15) is provided, wherein the working fluid inlet of the inlet temperature pretreatment module (15) is connected to the outlet of the electronic pressure controller (14). An intake working chamber (16) is provided, wherein the working fluid inlet of the intake working chamber (16) is connected to the working fluid outlet of the intake temperature pretreatment module (15), and the working fluid outlet of the intake working chamber (16) is configured to connect to the intake end of the compressor test module (3); and The first constant temperature bath circulation system includes a first constant temperature bath (19), a first circulation pump (10), and pipelines. The first constant temperature bath (19) is connected to the first circulation pump (10) via pipelines. The pipeline at the outlet of the first circulation pump (10) is connected to the constant temperature medium inlet of the intake air temperature pretreatment module (15) and flows through the intake air temperature pretreatment module (15). The pipeline leading out from the constant temperature medium outlet of the intake air temperature pretreatment module (15) is connected to the constant temperature medium inlet of the intake air working chamber (16) and passes through the intake air working chamber (16). The pipeline leading out from the constant temperature medium outlet of the intake air working chamber (16) returns to the first constant temperature bath (19) to form a circulation loop.

3. The dynamic testing cold energy stage according to claim 2, characterized in that, The constant temperature medium inlet of the air intake working chamber (16) is located at the bottom of the air intake working chamber (16), and the constant temperature medium outlet of the air intake working chamber (16) is located at the top of the air intake working chamber (16) and at a diagonal position opposite to the constant temperature medium inlet. The pipeline is arranged in a serpentine pattern inside the air intake working chamber (16), so that the constant temperature medium forms a piston flow state from bottom to top.

4. The dynamic testing cold energy stage according to claim 2, characterized in that, The constant temperature and pressure gas supply system (1) also includes: The first shut-off valve (18) is installed on the pipeline between the intake working chamber (16) and the intake end of the compressor test module (3); The second pressure sensor (p2) and the second temperature sensor (T2) are disposed in the air intake working chamber (16), and the second pressure sensor (p2) is electrically connected to the electronic pressure controller (14); A filter (13) is disposed between the electric heating module (12) and the electronic pressure controller (14); The first pressure sensor (p1) and the first temperature sensor (T1) are disposed between the electric heating module (12) and the filter (13).

5. The dynamic testing cold energy stage according to claim 1, characterized in that, The back pressure stabilizing system (2) includes: The exhaust working chamber (21) has its inlet end configured to connect to the exhaust end of the compressor test module (3); Electronic back pressure regulator (22), the inlet end of the electronic back pressure regulator (22) is connected to the outlet end of the exhaust working chamber (21), the outlet end of the electronic back pressure regulator (22) is connected to the working fluid recovery device, and the electronic back pressure regulator (22) adopts the upstream pressure control mode. The second shut-off valve (23) is located on the pipeline between the exhaust end of the compressor test module (3) and the exhaust working chamber (21); the exhaust working chamber (21) is equipped with a third pressure sensor (p3) and a third temperature sensor (T3), and the third pressure sensor (p3) is electrically connected to the electronic back pressure regulator (22).

6. The dynamic testing cold energy stage according to claim 5, characterized in that, The compressor test module (3) includes: The second constant temperature bath circulation system is configured to control the ambient temperature of the compressor test module (3); The temperature and pressure test sensor assembly includes a suction pressure sensor (p4) and a suction temperature sensor (T9) disposed on the suction side of the compressor, a discharge pressure sensor (p5) and a discharge temperature sensor (T10) disposed on the discharge side of the compressor, an oil sump temperature sensor (T5), a pump body temperature sensor (T6), a motor temperature sensor (T7), a housing temperature sensor (T8), and an ambient temperature sensor (T4) for testing the ambient temperature of the compressor test module (3). A power testing device (P) configured to test the power of a compressor; A flow meter (37) is disposed after the oil separator of the compressor and is configured to test the working fluid mass flow rate of the compressor.

7. The dynamic testing cold energy stage according to claim 6, characterized in that, The compressor test module (3) also includes: An oil separator (35) is provided, with its inlet connected to the compressor's exhaust pipe, its gas outlet connected to the exhaust working chamber (21), and its oil outlet pipe connected to the pipe between the compressor's liquid receiver and cylinder. The second constant temperature bath circulation system includes a second constant temperature bath (32), a second circulation pump (33), a heat exchanger (36), and pipelines; the second constant temperature bath (32) is connected to the second circulation pump (33) via pipelines, the pipeline at the outlet of the second circulation pump (33) is connected to the constant temperature medium inlet of the heat exchanger (36), and the constant temperature medium outlet of the heat exchanger (36) is connected to the second constant temperature bath (32) via pipelines to form a circulation loop; the heat exchanger (36) is installed inside the compressor test module (3) and is equipped with a fan, which can maintain the temperature uniformity inside the compressor test module (3), and the ambient temperature sensor (T4) is installed at the return air of the heat exchanger (36).

8. The dynamic testing cold energy stage according to claim 3, characterized in that, The electronic pressure controller (14), the intake air temperature pretreatment module (15), the intake working chamber (16), the first constant temperature bath circulation system, and the first shut-off valve (18) are all equipped with an external heat insulation layer.

9. The dynamic testing cold capacity stage according to claim 7, characterized in that, The second constant temperature bath circulation system, compressor (34), oil separator (35), power testing device (P), flow meter (37), and temperature and pressure testing sensor assembly are all installed inside the insulated box.

10. A compressor testing system, characterized in that, Includes the dynamic testing cooling platform as described in claim 1.

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