A test bench and test method for NVH of air conditioner compressor

Abstract

The present application relates to the measurement of mechanical vibration, and discloses a test bench and a test method for NVH of an air-conditioning compressor. The test bench is set up in a soundproof room, and the test bench includes: an isolation box, an air-conditioning compressor, a refrigerant high-pressure pipe, a refrigerant low-pressure pipe, a condenser, an evaporator, an electronic fan, and a blower. The inner wall of the isolation box is provided with sound insulation material and heat insulation material, and the isolation box is provided with a first through hole and a second through hole. The refrigerant high-pressure pipe passes through the first through hole, and the refrigerant low-pressure pipe passes through the second through hole. The condenser is connected to the air-conditioning compressor through the refrigerant high-pressure pipe, and the evaporator is connected to the air-conditioning compressor through the refrigerant low-pressure pipe. The electronic fan is installed on the condenser, and the blower is installed on the evaporator. The condenser, the evaporator, the electronic fan and the blower are all placed in the isolation box. The test method is applied to the test bench, and the test method may include: starting the air-conditioning compressor, the electronic fan and the blower, collecting sound data in the soundproof room and outside the isolation box, and analyzing the sound data.

Description

Technical Field

[0001] The present application relates to the measurement of mechanical vibration, and in particular to a test bench and a test method for NVH of an air-conditioning compressor. Background Art

[0002] With the improvement of automobile production technology, vehicle power noise has gradually decreased. Especially with the widespread development of electric vehicles today, the noise of the power system has almost disappeared, and the vibration noise of the air-conditioning compressor has gradually become prominent.

[0003] The vibration noise of the air-conditioning compressor is classified as active noise, which conforms to the "source-path-response" model. The path can be optimized by the OEM through finite element simulation, while the optimization of the source requires the help of early NVH (Noise Vibration Harshness) testing.

[0004] In NVH testing, existing test benches usually place the compressor in an anechoic chamber, connect the refrigerant high and low pressure pipelines to the refrigerant control cabinet, and control the compressor refrigerant pipeline pressure through the refrigerant control cabinet. The refrigerant control cabinet can only stably control the refrigerant pipeline pressure at a certain set value, which is usually controlled at 0.8-2.0Mpa. However, in the case of the whole vehicle, the refrigerant pressure changes dynamically between 0.8-2.0Mpa, and the refrigerant pressure value corresponding to each compressor speed is also different. Therefore, there is a large gap between the refrigerant pipeline pressure of this bench and the whole vehicle. The load simulated by the refrigerant control cabinet leads to a large gap in test accuracy between the compressor NVH and the whole vehicle. Summary of the invention

[0005] The technical problem to be solved by this application is: how to reduce the gap in test accuracy between the NVH test bench and the whole vehicle.

[0006] In order to solve the above technical problems, the present application provides a test bench and test method for NVH of an air-conditioning compressor. Specifically, the present application is implemented through the following solutions:

[0007] In a first aspect of the present application, a test bench for NVH of an air-conditioning compressor is provided, the test bench is set up in a soundproof room, and the test bench comprises: an isolation box, the inner wall of the isolation box is provided with sound insulation material and heat insulation material, and the isolation box is provided with a first through hole and a second through hole; an air-conditioning compressor; a refrigerant high-pressure pipe, the refrigerant high-pressure pipe passes through the first through hole; a refrigerant low-pressure pipe, the refrigerant low-pressure pipe passes through the second through hole; a condenser, the condenser is connected to the air-conditioning compressor through the refrigerant high-pressure pipe; an evaporator, the evaporator is connected to the air-conditioning compressor through the refrigerant low-pressure pipe; an electronic fan, the electronic fan is installed on the condenser; a blower, the blower is installed on the evaporator; wherein the condenser, the evaporator, the electronic fan and the blower are placed in the isolation box.

[0008] In one embodiment, the length of the refrigerant high-pressure pipe or the length of the refrigerant low-pressure pipe is 250 mm to 300 mm.

[0009] In another embodiment, the test bench also includes a controller and a temperature sensor; the temperature sensor is installed in the isolation box, and the controller is electrically connected to the electronic fan and the blower respectively; the controller is used to control the speed of the electronic fan and the blower according to the temperature collected by the temperature sensor.

[0010] In another embodiment, the test bench further includes a pressure sensor, and the pressure sensor is installed in the middle of the refrigerant high-pressure pipe or the middle of the refrigerant low-pressure pipe.

[0011] In another embodiment, the test bench also includes a compressor mounting frame, which includes: a base plate; four legs, which are mounted on the base plate; two bases, with a base fixed on every two legs; two compressor support plates, and the two compressor support plate frames are both arranged above the two bases, and a number of fixing holes are opened on the compressor support plates, and the number of fixing holes are used to fix the air-conditioning compressor.

[0012] In one embodiment, the compressor mounting frame also includes a first pipe bracket and a second pipe bracket, and the first pipe bracket and the second pipe bracket are respectively installed on both sides of the two compressor support plates; one of the first pipe bracket and the second pipe bracket is used to fix the refrigerant high-pressure pipe, and the other is used to fix the refrigerant low-pressure pipe.

[0013] In yet another embodiment, the test bench further includes at least three hanging ropes, which are used to hang the air-conditioning compressor in the anechoic chamber, and the hanging ropes are made of soft materials.

[0014] According to a second aspect of the present application, a method for testing the NVH of an air-conditioning compressor is provided. The method is applied to the test bench provided in the first aspect of the present application. The method includes: starting the air-conditioning compressor, the electronic fan and the blower; collecting sound data inside the soundproof room and outside the isolation box; and analyzing the sound data.

[0015] In one embodiment, the testing method further comprises:

[0016] The speed of the electronic fan or blower is adjusted according to the temperature data collected by the temperature sensor.

[0017] In another embodiment, the testing method further comprises:

[0018] The speed of the air conditioning compressor is adjusted according to the pressure data collected by the pressure sensor.

[0019] Compared with the prior art, the test bench and test method for NVH of an air-conditioning compressor in the embodiment of the present application have the following beneficial effects:

[0020] The test bench of the embodiment of the present application eliminates the refrigerant control cabinet system that can only control the set pressure value, and adopts a condenser and an evaporator. Different from the use process of conventional condensers and evaporators, the condenser and the evaporator are placed in the same container in the present application, cleverly utilizing the principle of air conditioning in reverse. The heat-generating condenser and the heat-absorbing evaporator can affect each other in the same space, so coupling the condenser and the evaporator can form a dynamically variable load. The innovative design of the test bench of the present application enables these changes to be reflected in real time during the test process. Compared with the solution of the refrigerant control cabinet, dynamic NVH data that is closer to the actual situation of the vehicle can be obtained, reducing the gap in test accuracy between the test bench and the whole vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a framework diagram of a test bench for NVH of an air-conditioning compressor exemplarily shown in an embodiment of the present application.

[0022] Figure 2 It is a schematic structural diagram of a compressor mounting bracket exemplarily shown in an embodiment of the present application.

[0023] Figure 3 It is a structural schematic diagram of a condenser mounting bracket exemplarily shown in an embodiment of the present application.

[0024] Figure 4 It is a structural schematic diagram of an evaporator mounting bracket exemplarily shown in an embodiment of the present application.

[0025] Figure 5 It is a flow chart of a method for testing NVH of an air-conditioning compressor exemplarily shown in an embodiment of the present application.

[0026] Reference numerals:

[0027] 1. Test bench, 2. anechoic chamber, 11. isolation box, 12. air conditioning compressor, 13. refrigerant high-pressure pipe, 14. refrigerant low-pressure pipe, 15. condenser, 16. evaporator, 17. electronic fan, 18. blower, 19. compressor mounting bracket, 191. bottom plate, 192. support foot, 193. base, 194. compressor support plate, 1941. fixing hole, 195. first pipeline bracket, 196. second pipeline bracket, 20. condenser mounting bracket, 201. metal bottom plate, 202. column support plate, 203. horizontal support plate, 204. pad, 205. support block, 206. third pipeline mounting bracket, 207. fourth pipeline mounting bracket, 208. roller, 21. evaporator mounting bracket, 211. large bracket, 212. small bracket, 213. bracket pad. DETAILED DESCRIPTION

[0028] The specific implementation methods of the present application are further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but are not intended to limit the scope of the present application.

[0029] In the description of the present application, it should be understood that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are intended to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such terms are interchangeable where appropriate so that the embodiments of the present application can be implemented in a marking manner other than illustrated or described. In addition, "including", "having" and any variation thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of components, steps or units is not necessarily limited to those components, steps or units explicitly listed, and may also include other components, steps or units that are not explicitly listed but are inherent to these processes, methods, products or devices.

[0030] As a means of estimation, the difference between the estimated conditions and results and the actual situation is directly related to the accuracy of the test. The same is true for NVH (Noise, Vibration and Harshness) testing.

[0031] For vehicles, as one of the private spaces, there are certain requirements for the noise level. With the change of energy types and technological innovation, both electric vehicles and fuel vehicles have significantly reduced the noise level in the power source, which also makes the noise of the air-conditioning compressor gradually stand out. Therefore, NVH testing of the air-conditioning compressor is necessary.

[0032] In the traditional test bench, the refrigerant high and low pressure pipelines are connected to the refrigerant control cabinet, and the refrigerant pipeline pressure of the compressor is controlled by the refrigerant control cabinet. Its control method is relatively simple, and the refrigerant pipeline pressure can only be stably controlled at a certain set value, which is generally in the range of 0.8-2.0Mpa.

[0033] However, in actual vehicle operation, the refrigerant pressure is not constant, but changes dynamically between 0.8-2.0Mpa. And different compressor speeds correspond to different refrigerant pressure values. This means that the refrigerant pressure simulated by the refrigerant control cabinet in the traditional test bench cannot truly restore the dynamic change characteristics of the refrigerant pressure in the whole vehicle.

[0034] Since there is a large gap between the simulated refrigerant pressure and the actual vehicle conditions, the compressor NVH data measured based on the test bench deviates greatly from the actual NVH conditions of the vehicle. Such test results cannot accurately reflect the actual NVH performance of the compressor under complex vehicle working conditions, which may make subsequent optimization measures for the compressor NVH problem lack of pertinence and difficult to effectively improve the NVH level of the vehicle.

[0035] Based on this, the present application provides a test bench 1 and a test method for NVH of an air-conditioning compressor.

[0036] like Figure 1 As shown, in the first aspect of the present application, a test bench 1 for NVH of an air-conditioning compressor is provided. The test bench 1 is arranged in a silencing chamber 2, and the test bench 1 includes: an isolation box 11, an air-conditioning compressor 12, a refrigerant high-pressure pipe 13, a refrigerant low-pressure pipe 14, a condenser 15, an evaporator 16, an electronic fan 17, and a blower 18.

[0037] The inner wall of the isolation box 11 is provided with sound insulation material and heat insulation material, and the isolation box 11 is provided with a first through hole and a second through hole. The refrigerant high-pressure pipe 13 passes through the first through hole, and the refrigerant low-pressure pipe 14 passes through the second through hole. The condenser 15 is connected to the air-conditioning compressor 12 through the refrigerant high-pressure pipe 13, and the evaporator 16 is connected to the air-conditioning compressor 12 through the refrigerant low-pressure pipe 14. The electronic fan 17 is installed on the condenser 15, and the blower 18 is installed on the evaporator 16. The condenser 15, the evaporator 16, the electronic fan 17 and the blower 18 are all placed in the isolation box 11.

[0038] Through the above scheme, the condenser 15 and the evaporator 16 are placed in the same isolation box 11, and heat exchange is formed inside. The condenser 15 and the evaporator 16 have opposite physical properties. The present application cleverly utilizes the air conditioning principle in reverse, and couples the opposite condenser 15 and evaporator 16. The operation of the condenser 15 will increase the working power of the evaporator 16, and the operation of the evaporator 16 will increase the working power of the condenser 15. Placing the condenser 15 and the evaporator 16 together can spontaneously and gradually increase the power of each other.

[0039] As the load, the condenser 15 and the evaporator 16 gradually increase their load power, forming a dynamic load, and the refrigerant high-pressure pipe 13 connected to the condenser 15 and the refrigerant low-pressure pipe 14 connected to the evaporator 16 can both dynamically increase the pressure. Since the condenser 15 and the evaporator 16 are the main loads of the vehicle air conditioner, the dynamic pressure brought to the refrigerant high-pressure pipe 13 and the refrigerant low-pressure pipe 14 is closer to the actual situation of the vehicle.

[0040] At the same time, since the isolation box 11 has sound insulation and heat insulation materials, the condenser 15 and the evaporator 16 located in the isolation box 11 have less impact on the noise test of the air-conditioning compressor 12 located outside the isolation box 11, thereby reducing interference with the test.

[0041] On the other hand, the refrigerant control cabinet system in the traditional solution is arranged outside the anechoic chamber, which is far away from the compressor. Therefore, the pipeline is longer than that of the whole vehicle. The pipeline length of the whole vehicle is usually only 250mm-300mm, while the length of the pipeline connecting the refrigerant control cabinet system usually needs to reach 3m-10m. This is also the reason for the huge gap between the traditional solution and the whole vehicle.

[0042] In order to further improve the closeness between the test bench 1 and the actual situation of the vehicle, in one embodiment of the present application, the length of the refrigerant high-pressure pipe 13 or the length of the refrigerant low-pressure pipe 14 is 250 mm to 300 mm.

[0043] Since all the components of the test bench 1 in the present application are located in the anechoic chamber 2, and the isolation box 11 has the functions of sound insulation and heat insulation, even if the isolation box 11 where the condenser 15 and the evaporator 16 are located is close to the air-conditioning compressor 12, it will not have much negative impact on the air-conditioning compressor 12. Therefore, in the present application, the refrigerant high-pressure and refrigerant low-pressure pipes 14 with the same length as the whole vehicle can be used, that is, the length is 250 mm to 300 mm.

[0044] In yet another embodiment of the present application, the test bench 1 may further include a controller and a temperature sensor.

[0045] The temperature sensor is installed in the isolation box 11, and the controller is electrically connected to the electronic fan 17 and the blower 18. The controller is used to control the speed of the electronic fan 17 and the blower 18 according to the temperature collected by the temperature sensor.

[0046] The speed of the electronic fan 17 is related to the surface air velocity of the condenser 15, and the speed of the blower 18 is related to the surface air velocity of the evaporator 16. Through the above scheme, when the air temperature in the isolation box 11 is measured, the speed of the electronic fan 17 or the blower 18 is adjusted to control the surface velocity, thereby changing the heat exchange rate, that is, changing the load power, so as to change the pressure of the refrigerant high-pressure pipe 13 or the refrigerant low-pressure pipe 14, and realize human intervention adjustment. Human adjustment can control the rate of dynamic change to meet more abundant test requirements.

[0047] It is understandable that when heat absorption and heat release occur simultaneously, there is always a difference. Since the condenser 15 and the evaporator 16 have opposite physical properties, during the test, they absorb and release heat simultaneously, and there is a difference. The temperature in the isolation box 11 can intuitively reflect the size and positive and negative of this difference. This feature provides the test bench 1 with the ability to accurately monitor energy transfer and thermal management.

[0048] In another embodiment of the present application, the test bench 1 may further include a pressure sensor, which is installed in the middle of the refrigerant high-pressure pipe 13 or the middle of the refrigerant low-pressure pipe 14 .

[0049] Through the above solution, the pressure of the refrigerant high-pressure pipe 13 and the refrigerant low-pressure pipe 14 can be monitored. Since the installation position of the pressure sensor is close to the middle, the measurement accuracy is higher.

[0050] On this basis, in one embodiment, if Figure 2 As shown, the test bench 1 may further include a compressor mounting frame 19 , and the compressor mounting frame 19 includes: a bottom plate 191 , four legs 192 , two bases 193 and two compressor support plates 194 .

[0051] Among them, four supporting legs 192 are installed on the bottom plate 191, and a base 193 is fixed on every two supporting legs 192. Two compressor support plates 194 are arranged above the two bases 193. Several fixing holes 1941 are opened on the compressor support plate 194, and the several fixing holes 1941 are used to fix the air-conditioning compressor 12.

[0052] Through the above scheme, a series of mounting components enable the compressor mounting bracket 19 to have multiple adjustable parameters, such as the size and position of the compressor support plate 194, the position of the fixing hole 1941, the installation spacing of the two bases 193, etc., so that the compressor mounting bracket can more realistically simulate the installation environment of the air-conditioning compressor 12 in the engine compartment of various models, so that the test accuracy of the test bench 1 in this application is more accurate and closer to the test requirements.

[0053] In the NVH (noise, vibration and harshness) test of vehicle air conditioners, the installation method of the compressor has a great influence on its vibration and noise characteristics. The purpose of simulating the fixed boundary of the whole vehicle installation is to make the installation state of the compressor in the test environment as close as possible to its actual installation condition on the car. The purpose of this is to obtain more accurate test results, because the installation position and method of the compressor on the whole vehicle will affect its vibration transmission path and noise radiation characteristics.

[0054] In one embodiment, the compressor mounting frame 19 also includes a first pipe bracket 195 and a second pipe bracket 196, and the first pipe bracket 195 and the second pipe bracket 196 are respectively installed on both sides of the two compressor support plates 194; one of the first pipe bracket 195 and the second pipe bracket 196 is used to fix the refrigerant high-pressure pipe 13, and the other is used to fix the refrigerant low-pressure pipe 14.

[0055] On this basis, two pipe brackets may be provided so that the peripheral components that may affect the air-conditioning compressor 12 are closer to the actual vehicle.

[0056] In the present application, the test bench 1 may further include a condenser 15 mounting bracket or an evaporator 16 mounting bracket to provide a stable heat exchange environment.

[0057] Specifically, Figure 3 As shown, the condenser 15 mounting bracket in the present application may include a metal base plate 201191 , three column support plates 202 , two transverse support plates 203 , a number of pads 204 and two support blocks 205 .

[0058] Three column support plates 202 are arranged on the metal base plate 201191. The head end, middle part and tail end of any transverse support plate 203 are respectively fixed on the three column support plates 202. The two transverse support plates 203 are arranged up and down. A pad 204 is provided at the connection between the transverse support plate 203 and the column support plate 202. Two support blocks 205 are also installed on the transverse support plate 203 located below. The transverse support plate 203 and the support block are used to install the condenser 15.

[0059] A third pipe mounting bracket 206 and a fourth pipe mounting bracket 207 may also be provided on the mounting bracket of the condenser 15 to further fix one end of the condensation high-pressure pipe and the condensation low-pressure pipe in the isolation box 11 .

[0060] Specifically, Figure 4 As shown, the evaporator 16 mounting bracket in the present application may include a metal bottom plate 201191, a large bracket 211, a small bracket 212, and a plurality of bracket pads 213204. The large bracket 211 and the small bracket 212 are both vertically mounted on the metal bottom plate 201191, and bracket pads 213204 are mounted on the large bracket 211 and the small bracket 212, and the bracket pads 213204 are used to mount the evaporator 16.

[0061] The mounting bracket of the condenser 15 and the mounting bracket of the evaporator 16 can share the same bottom plate 191 to increase stability and reduce the influence of relative shaking between the two on heat exchange.

[0062] Furthermore, the mounting bracket of the condenser 15 and the mounting bracket of the evaporator 16 can be installed with rollers 208 to facilitate adjustment of the placement position during the test process and improve flexibility.

[0063] In another embodiment of the present application, the test bench 1 may further include at least three hanging ropes, which are used to hang the air-conditioning compressor 12 in the anechoic chamber 2, and the hanging ropes are made of soft materials.

[0064] Under the condition that the load is consistent with the vehicle state, the test unit of the compressor is hoisted by a soft rope, which is an innovative test method. This method is mainly used to study the NVH characteristics of the compressor itself, eliminating the interference of other components (such as brackets, connecting pipes, etc.) on the test results. When the load (such as refrigerant pressure, flow, etc.) is the same as the vehicle state, the NVH performance of the compressor unit can be tested in a relatively "pure" environment.

[0065] Correspondingly, such as Figure 5 As shown, the present application also provides a method for testing NVH of an air-conditioning compressor. The testing method is applied to the test bench 1 provided in the first aspect of the present application. The testing method may include:

[0066] S101 , start the air-conditioning compressor 12 , the electronic fan 17 and the blower 18 .

[0067] S102 , collecting sound data inside the anechoic chamber 2 and outside the isolation box 11 .

[0068] S103: Analyze the sound data.

[0069] In one embodiment of the present application, the testing method may further include: adjusting the rotation speed of the electronic fan 17 or the blower 18 according to the temperature data collected by the temperature sensor.

[0070] In another embodiment of the present application, the testing method may further include: adjusting the rotation speed of the air-conditioning compressor 12 according to the pressure data collected by the pressure sensor.

[0071] Compared with the prior art, the test bench 1 and test method for NVH of an air-conditioning compressor in the embodiment of the present application have the following beneficial effects:

[0072] The test bench 1 of the embodiment of the present application eliminates the refrigerant control cabinet system that can only control the set pressure value, and adopts a condenser 15 and an evaporator 16. Different from the use process of the conventional condenser 15 and the evaporator 16, the condenser 15 and the evaporator 16 are placed in the same container in the present application, cleverly utilizing the principle of air conditioning in reverse. The heat-generating condenser 15 and the heat-absorbing evaporator 16 can affect each other in the same space, so coupling the condenser 15 and the evaporator 16 can form a dynamically variable load. The innovative design of the test bench 1 of the present application enables these changes to be reflected in real time during the test process, and compared with the solution of the refrigerant control cabinet, dynamic NVH data that is closer to the actual situation of the vehicle can be obtained.

[0073] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present application. These improvements and substitutions should also be regarded as the scope of protection of the present application.

Claims

1. A test bench for NVH of an air-conditioning compressor, characterized in that: The test bench (1) is arranged in a anechoic chamber (2), and the test bench (1) comprises: An isolation box (11), the inner wall of the isolation box (11) being provided with sound insulation material and heat insulation material, and the isolation box (11) being provided with a first through hole and a second through hole; Air conditioning compressor (12); A refrigerant high-pressure pipe (13), wherein the refrigerant high-pressure pipe (13) passes through the first through hole; A refrigerant low-pressure pipe (14), wherein the refrigerant low-pressure pipe (14) passes through the second through hole; A condenser (15), the condenser (15) being connected to the air-conditioning compressor (12) via the refrigerant high-pressure pipe (13); an evaporator (16), the evaporator (16) being connected to the air-conditioning compressor (12) via the refrigerant low-pressure pipe (14); an electronic fan (17), wherein the electronic fan (17) is mounted on the condenser (15); a blower (18), the blower (18) being mounted on the evaporator (16); Wherein, the condenser (15), the evaporator (16), the electronic fan (17) and the blower (18) are placed in the isolation box (11).

2. The test bench according to claim 1, characterized in that: The length of the refrigerant high-pressure pipe (13) or the length of the refrigerant low-pressure pipe (14) is 250 mm to 300 mm.

3. The test bench according to claim 1, characterized in that: The test bench (1) also includes a controller and a temperature sensor; The temperature sensor is installed in the isolation box (11), and the controller is electrically connected to the electronic fan (17) and the blower (18) respectively; The controller is used to control the rotation speed of the electronic fan (17) and the rotation speed of the blower (18) according to the temperature collected by the temperature sensor.

4. The test bench according to claim 3, characterized in that: The test bench (1) also includes a pressure sensor, which is installed in the middle of the refrigerant high-pressure pipe (13) or the middle of the refrigerant low-pressure pipe (14).

5. The test bench according to claim 1, characterized in that: The test bench (1) further comprises a compressor mounting frame (19), wherein the compressor mounting frame (19) comprises: Bottom plate (191); Four supporting legs (192), the four supporting legs (192) being mounted on the bottom plate (191); Two bases (193), one base (193) being fixed on every two of the legs (192); Two compressor support plates (194), the two compressor support plates (194) are both arranged above the two bases (193), and a plurality of fixing holes (1941) are provided on the compressor support plates (194), and the plurality of fixing holes (1941) are used to fix the air-conditioning compressor (12).

6. The test bench according to claim 5, characterized in that: The compressor mounting frame (19) further comprises a first pipeline support (195) and a second pipeline support (196), wherein the first pipeline support (195) and the second pipeline support (196) are respectively mounted on both sides of the two compressor support plates (194); Of the first pipe bracket (195) and the second pipe bracket (196), one is used to fix the refrigerant high-pressure pipe (13), and the other is used to fix the refrigerant low-pressure pipe (14).

7. The test bench according to claim 1, characterized in that: The test bench (1) further comprises at least three hanging ropes, the hanging ropes being used to hang the air-conditioning compressor (12) in the anechoic chamber (2), the hanging ropes being made of soft material.

8. A method for testing NVH of an air-conditioning compressor, characterized in that: The test method is applied to the test bench (1) according to any one of claims 1 to 7, and the test method comprises: Starting the air conditioning compressor (12), the electronic fan (17) and the blower (18); Collecting sound data inside the anechoic chamber (2) and outside the isolation box (11); The sound data is analyzed.

9. The testing method according to claim 8, characterized in that: The test method also includes: The rotation speed of the electronic fan (17) or the blower (18) is adjusted according to the temperature data collected by the temperature sensor.

10. The testing method according to claim 9, characterized in that: The test method also includes: The rotation speed of the air-conditioning compressor (12) is adjusted according to the pressure data collected by the pressure sensor.

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