Vehicle air conditioner HVAC assembly noise test device and test method

Abstract

The invention provides a vehicle air conditioner HVAC assembly noise test device and test method, a test bench is used for accommodating an air conditioner HVAC assembly, and a noise collector is arranged above the test bench; the test rack comprises a frame, side plates are hermetically mounted on the side surfaces of the frame, a bottom plate is hermetically mounted on the bottom surface of the frame, a top surface opening is formed in the top surface of the frame, and the cover plate seals the test rack when rotating to cover the top surface opening; the side plates comprise an air inlet side plate and an air door side plate, the air inlet side plate is provided with an air inlet, the air inlet is provided with a pressure detector and is connected with an air inducing opening of the air conditioner HVAC assembly, the air door side plate is provided with an air door opening, and an air plate installed on the air door opening is arranged in a sliding mode so as to adjust the opening degree of the air door opening. By providing the test bench with the back pressure, the air volume and the sealing conditions, the noise of the air conditioner HVAC assembly carried on the whole vehicle is accurately simulated, data with reference value is provided for the noise of the air conditioner HVAC assembly after the air conditioner HVAC assembly is installed on the whole vehicle, and the probability of rectification due to the noise problem in the later stage of research and development is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of vehicle air conditioner noise, and relates to a vehicle air conditioner HVAC assembly noise testing device and testing method. BACKGROUND

[0002] With the development of automobile manufacturing level and the improvement of people's requirement for riding comfort, the requirement for the whole vehicle NVH performance is also higher and higher, and the vehicle interior air conditioner blowing noise is an important factor influencing the comfort of passengers. In addition to the basic requirements of the vehicle air conditioner heating, refrigeration and defrosting, the requirement for the operating noise performance under these modes is also higher and higher, so that the air conditioner noise testing and optimization scheme also receive more and more attention.

[0003] At present, the noise test of the air conditioner HVAC system by the host factory or the air conditioner part supplier is measured in the environment similar to the free field, such as no back pressure, no air volume, no sealing (simulating the whole vehicle environment). The measured result is quite different from the noise of the air conditioner HVAC system under the whole vehicle condition, and the noise problem of the air conditioner HVAC system mounted on the whole vehicle cannot be accurately restored. Once the HVAC system noise is judged to meet the above test method and is directly mounted on the whole vehicle, the whole vehicle air conditioner system noise will be large due to the large air conditioner HVAC assembly noise, the sound quality is poor, and there are problems of great difficulty in rectification, long cycle and high cost in the later stage. SUMMARY

[0004] The application provides a vehicle air conditioner HVAC assembly noise testing device and testing method to solve the problems in the prior art, provides a test bench with back pressure, air volume and sealing conditions, accurately simulates the noise of the air conditioner HVAC assembly mounted on the whole vehicle, provides data with reference value for the noise of the air conditioner HVAC assembly mounted on the whole vehicle, and reduces the probability of rectification due to noise problems in the later stage of research and development.

[0005] The application provides a vehicle air conditioner HVAC assembly noise testing device, which comprises a test bench for accommodating an air conditioner HVAC assembly, wherein a noise collector is arranged above the test bench; the test bench comprises a frame, a side plate is sealingly arranged on the side of the frame, a bottom plate is sealingly arranged on the bottom surface of the frame, and a top surface of the frame is provided with a top surface opening and connected with a rotatably arranged cover plate; when the cover plate is rotated to cover the top surface opening, the test bench is sealed; the side plate comprises an air inlet side plate and a damper side plate arranged on opposite sides of the frame respectively, an air inlet is arranged on the air inlet side plate, a pressure detector is arranged on the air inlet and connected with an air inlet of the air conditioner HVAC assembly, a damper opening is arranged on the damper side plate, and a damper plate is arranged on the side of the damper opening and can be slidingly arranged to adjust the opening degree of the damper opening.

[0006] Optionally, the number of air inlets is at least two, the pressure detector is detachably arranged on one of the air inlets, and a sealing baffle is detachably arranged on the remaining air inlets.

[0007] Optionally, the pressure detector comprises a detection body, a pressure sensor is arranged on the detection body, an air passage is arranged in the detection body, and the outer periphery of the detection body is detachably and sealingly connected with the air inlet.

[0008] Optionally, a first sliding rail is arranged on the upper part of the damper opening, a second sliding rail is arranged on the lower part of the damper opening, and the two sides of the damper plate are slidingly arranged on the first sliding rail and the second sliding rail respectively.

[0009] Optionally, the noise collector comprises a microphone, and the microphone is arranged above the test bench.

[0010] Optionally, a sealable air bag is circumferentially arranged on the side wall of the cover plate, and the air bag is sealingly abutted on the side wall of the top surface opening after being inflated when the cover plate covers the top surface opening.

[0011] Optionally, a temperature control interlayer is arranged on the outer wall of the bottom plate or the side plate, and a heat exchange channel is arranged in the temperature control interlayer.

[0012] The application further provides a vehicle air conditioner HVAC assembly bench noise testing method, which tests the noise of the air conditioner HVAC assembly by the vehicle air conditioner HVAC assembly noise testing device.

[0013] Optionally, the method further comprises the following step: the distance between the upper surface of the air conditioner HVAC assembly and the inner top surface of the test bench is L1, and 150mm≤L1≤250mm.

[0014] Optionally, the method further comprises the following step: the air inlet of the test bench is provided with three air inlets, the air inlet of the air conditioner HVAC assembly is connected to one corresponding air inlet, and the other two air inlets are sealed.

[0015] The above technical scheme has the following beneficial effects: The vehicle air conditioner HVAC assembly noise testing device and the testing method provided by the application realize the air inlet adjustment of the HVAC by connecting the air inlet of the test bench to the air inlet of the air conditioner HVAC assembly, realize the back pressure adjustment of the test bench by adjusting the opening degree of the air door opening through the air door side plate of the test bench, and realize the sealing of the test bench by rotating the cover plate, so that the air conditioner HVAC assembly can be operated when the top opening is opened and the test bench is sealed when the top opening is closed, thereby forming a sealed environment in the test bench. The noise collector is arranged above the test bench to collect the noise emitted by the air conditioner HVAC assembly during operation, thereby accurately simulating the noise of the air conditioner HVAC assembly mounted on the whole vehicle, providing data with reference value for the noise of the air conditioner HVAC assembly mounted on the whole vehicle, and reducing the probability of rectification due to noise problems in the late development stage. BRIEF DESCRIPTION OF DRAWINGS

[0016] The preferred embodiments of the application will be described in detail below with reference to the accompanying drawings, which are intended to help understand the purpose and advantages of the application.

[0017] Figure 1A structure schematic view of a vehicle air conditioner HVAC assembly noise test device provided by an optional embodiment of the present application is provided with an air inlet side plate.

[0018] Figure 2 A structure schematic view of a vehicle air conditioner HVAC assembly noise test device provided by an optional embodiment of the present application is provided with an air inlet side plate.

[0019] Figure 3 A flow chart of a vehicle air conditioner HVAC assembly bench noise test method provided by an optional embodiment of the present application.

[0020] Figure 4 A noise curve measured by a test bench and a test method provided by the present application, a noise curve measured by a traditional test bench and a noise curve in a whole vehicle environment.

[0021] Explanation of reference signs: 1-test bench, 10-frame, 100-top opening, 11-side plate, 110-air inlet side plate, 110a-air inlet, 110b-sealing baffle, 111-air door side plate, 111a-air door opening, 12-air baffle, 120-first sliding rail, 121-second sliding rail, 13-pressure detector, 130-detection main body, 131-pressure sensor, 132-air passage, 14-bottom plate, 15-cover plate. DETAILED DESCRIPTION

[0022] The technical solutions of the present application will be further described in detail below by embodiments and in combination with the drawings. In the present specification, the orientation terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or possibly mentioned are defined with respect to the structure shown in the drawings, and the words "inner" and "outer" respectively refer to the direction towards or away from the geometric center of a particular component. They are relative concepts, so they may change accordingly according to their different positions, different use states. Therefore, these or other orientation terms should not be interpreted as restrictive terms.

[0023] The vehicle air conditioner HVAC assembly noise test device provided by the present application comprises a test bench 1, the test bench 1 is used to accommodate an air conditioner HVAC assembly, and a noise collector is arranged above the test bench 1.

[0024] The test bench 1 comprises a frame 10, a side plate 11 is sealingly installed on the side of the frame 10, a bottom plate 14 is sealingly installed on the bottom of the frame 10, a top opening 100 is arranged on the top of the frame 10 and a rotatably arranged cover plate 15 is connected, and the cover plate 15 is sealing when it is rotated to cover the top opening 100.

[0025] The embodiment of the present application provides a closed and openable test cavity. The frame 10 can be welded by aluminum profiles or steel materials to provide a main support structure. The side plate 11, the bottom plate 14 and the cover plate 15 can be made of light-transmitting materials such as glass and plastic, so that the inside of the test bench 1 can be observed from the outside. The side plate 11, the bottom plate 14 and the cover plate 15 can also be made of soundproof and heat-insulating materials such as composite steel plates, which are connected to the frame 10 by bolts and sealed with sealing strips at the joints, so as to effectively isolate external noise and temperature interference and create a stable semi-free sound field test environment inside.

[0026] Further, the air inlet side plate 110 and the air door side plate 111 can be individually provided as steel plate structures to increase the stability of the upper parts thereof, and the other positions of the side plate 11 are provided as glass, plastic or the like structure so that the internal structure can be seen.

[0027] The top opening 100 is used for lifting and placing the air conditioner HVAC assembly, which is convenient to operate. The rotatable cover plate 15 is connected to the frame 10 by hinges or rotating shaft mechanisms, so that it can be opened and closed like a door. The cover plate 15 seals the test bench 1 after being closed, which ensures the airtightness of the test environment. A sealing ring can be provided at the joint between the cover plate 15 and the top opening 100 after the cover plate 15 covers the top opening 100, so as to increase the sealing stability of the joint.

[0028] As shown in Figure 1 and Figure 2 , the side plate 11 includes an air inlet side plate 110 and an air door side plate 111 respectively arranged on the two opposite sides of the frame 10. The air inlet side plate 110 is provided with an air inlet 110a, and the pressure detector 13 is installed on the air inlet 110a and connected to the air inlet of the air conditioner HVAC assembly. The air door side plate 111 is provided with an air door opening 111a, and the air door 12 is installed on the side of the air door opening 111a. The air door 12 is slidably arranged to adjust the opening degree of the air door opening 111a, thereby adjusting the back pressure of the test bench 1.

[0029] The air inlet side plate 110 and the air door side plate 111 respectively simulate the air inlet environment and the air outlet environment of the air conditioner HVAC assembly in the actual vehicle. The air inlet side plate 110 and the air door side plate 111 are arranged opposite to each other to form an air flow path through the test bench 1. The air inlet 110a is the inlet of the controlled air flow.

[0030] In an optional embodiment, the air inlet of the air conditioning HVAC assembly can be located at the air flow inlet of the air blower, and the air blower of the air conditioning HVAC assembly introduces the air outside the test bench 1 through the air inlet 110a when working. The damper opening 111a and the air baffle 12 jointly simulate the inlet and outlet resistance of the vehicle air duct. By adjusting the position of the air baffle 12 to change the effective cross section of the damper opening 111a, the air resistance under different vehicle models and different air baffles can be accurately reproduced, so that the test working condition is closer to the actual situation, and the measured noise data has more reference value.

[0031] The vehicle air conditioning HVAC assembly noise test device provided by the embodiment of the application is characterized in that: the air inlet of the test bench is connected with the air inlet of the air conditioning HVAC assembly, so as to realize the air inlet adjustment of the HVAC; the damper side plate 111 of the test bench is provided with a damper opening 111a, and the air baffle 12 is arranged on the side of the damper opening 111a; the air baffle 12 is slidably arranged to adjust the opening degree of the damper opening 111a, so as to adjust the back pressure of the test bench 1; the cover plate 15 is rotatable, so that the air conditioning HVAC assembly can be operated when the top opening is opened, and the test bench 1 is sealed when the cover plate 15 is closed, thereby forming a sealed environment in the test bench 1; the noise collector is arranged above the test bench 1 to collect the noise radiated by the air conditioning HVAC assembly during operation, so as to accurately simulate the noise of the air conditioning HVAC assembly mounted on the whole vehicle, provide data with reference value for the noise of the air conditioning HVAC assembly mounted on the whole vehicle, and reduce the probability of rectification due to noise problems in the late research and development.

[0032] In an optional embodiment, the number of the air inlets 110a is at least two, and the pressure detector 13 is detachably arranged on one of the air inlets 110a, and the remaining air inlets 110a are all detachably provided with the sealing baffle 110b.

[0033] In the embodiment of the application, the number of the air inlets 110a is preferably three, which correspond to the left-biased, middle and right-biased positions of the air inlets of the air conditioning HVAC assembly on different vehicle models, as shown in the drawing. Figure 1 According to the arrangement of common vehicle models, three air inlets 110a are sequentially arranged at positions with the same height but different horizontal positions. During the test, the air inlet 110a corresponding to the horizontal position is selected according to the vehicle model simulated by the air conditioning HVAC assembly to be tested, so as to increase the adaptability of the air conditioning HVAC assembly, effectively reduce the length of the air pipe and reduce the noise deviation. When the air inlet and the air inlet 110a are connected, the air inlet 110a corresponding to the air inlet is selected for sealing connection, the remaining two air inlets 110a are covered with the sealing baffle 110b, and the sealing baffle 110b and the air inlet 110a are sealed by the sealing ring or the sealing strip, so as to ensure that the sealing baffle 110b is sealed on the air inlet 110a.

[0034] The sealing baffle 110b is also equipped with a sleeve, block, column and other structures embedded inside the air inlet 110a. The outer wall of the sleeve, block and column and other embedded structures is equipped with a sealing ring or sealing strip to seal with the inner wall of the air inlet 110a, thereby increasing the sealing and blocking effect of the air inlet 110a.

[0035] In an optional embodiment, the pressure detector 13 includes a detection body 130, on which a pressure sensor 131 is mounted. An air vent 132 is formed inside the detection body 130. The outer periphery of the detection body 130 is detachably and sealed to the air inlet 110a. The pressure detector 13 is configured as a modular component and can be detachably installed on the air inlet 110a that needs to be tested, eliminating the need to install a pressure sensor 131 at each air inlet 110a, thus saving costs.

[0036] Among them, such as Figure 1 As shown, the detection body 130 can be a hollow cylindrical or annular structure, with the air vent 132 ensuring smooth airflow from the outside. The pressure sensor 131 is mounted on the inner wall of the air vent 132, with its probe extending to measure fluid pressure. The outer periphery of the detection body 130 can be detachably connected to the air inlet 110a via flanges, snap-fit ​​connections, or quick couplings, with a sealing ring at the interface to ensure airtightness. This allows for quick installation or removal of the pressure sensor 130 when testing different items.

[0037] Furthermore, a humidifying nozzle can be provided on the side wall of the detection body. The humidifying nozzle is connected to a humidifier through a pipe. A peristaltic pump and a control valve are installed on the pipe. The humidifying nozzle is used to simulate a humidified environment. When the humidification mode is turned on, the peristaltic pump and the control valve are turned on to deliver water in the humidifier to the humidifying nozzle at a small flow rate. The water is then sprayed through the humidifying nozzle towards the air inlet 110a.

[0038] Furthermore, three pressure sensors 131 can be installed on the detection body 130. The three pressure sensors 131 are located on both sides and between the two sides of the detection body 130 along the horizontal direction, respectively, to measure the pressure values ​​on both sides and in the middle of the air outlet 132, and calculate the average pressure value of the air outlet 132, thereby increasing the accuracy of pressure detection.

[0039] In an alternative embodiment, the upper portion of the damper opening 111a is provided with a first sliding rail 120, and the lower portion of the damper opening 111a is provided with a second sliding rail 121, and the two sides of the damper plate 12 are respectively slidably arranged on the first sliding rail 120 and the second sliding rail 121. The structure of the upper and lower double sliding rails of the first sliding rail 120 and the second sliding rail 121 ensures that the damper plate 12 is stable and does not shake during sliding, and can be accurately stopped at any intermediate position, thereby realizing stepless adjustment of the damper opening degree.

[0040] The first sliding rail 120 and the second sliding rail 121 can be groove-shaped structures embedded in the upper edge and the lower edge of the damper opening 111a, and the groove openings are all directed towards the damper opening 111a; or can be metal or plastic sliding rails installed on the upper portion and the lower portion outside the damper opening 111a. The damper plate 12 can be made of the same sound insulation material as the side plate 11, and the two side edges are embedded in the groove-shaped structure or the sliding rail. In order to fix the opening degree, a locking mechanism can also be provided, for example, a knob is designed on the damper plate 12, and after being tightened, the end portion can abut against the first sliding rail 120, the second sliding rail 121 or the side plate 11 to prevent the damper plate 12 from moving due to air flow impact.

[0041] In an alternative embodiment, the noise collector includes a microphone, and the microphone is arranged above the test stand. When the cover plate 15 is sealed and covers the top opening 100, the microphone can be vertically spaced apart from the top surface of the cover plate 15 by about 350mm-450mm, and the height can be set according to the required test height to test the noise value radiated from the test stand 1.

[0042] In an alternative embodiment, the microphone is installed on an adjustable tripod or a mechanical arm to facilitate adjustment of the vertical height and the lateral position.

[0043] Further, the microphone can be provided in two, and both of the microphones are arranged directly above the test stand 1.

[0044] In an alternative embodiment, a sealable air bag is circumferentially installed on the side wall of the cover plate 15, and the air bag is inflated and sealed against the side wall of the top opening 100 after the cover plate 15 covers the top opening 100. The air bag in the embodiment of the present application can be made of rubber or elastic polymer and is installed in the annular groove formed in the side wall of the cover plate 15. When the cover plate 15 covers the top opening 100, the air bag is inflated by an air pump, so that it is tightly abutted against the side wall of the top opening 100, and even if there is a slight unevenness on the contact surface, a perfect seal can be achieved. After the test is completed, the air bag is deflated and shrunk, and the cover plate 15 can be easily opened, which greatly reduces the operation difficulty and ensures the sealing reliability during long-term use.

[0045] Wherein, the top of the cover plate 15 can be provided with an inflation port, the inflation port is communicated with the sealed air bag, the air pump is connected to the inflation port through an elastic pipeline, and a control valve is arranged on the elastic pipeline; when the sealed air bag needs to be inflated, the control valve is opened to inflate and closed after the inflation to make the sealed air bag in a sealed state.

[0046] In an optional embodiment, the outer wall of the bottom plate 14 or the side plate 11 is provided with a temperature control interlayer, and a heat exchange channel is arranged in the temperature control interlayer. The heat exchange channel can be connected with a liquid bath or a refrigeration unit, so that the constant-temperature liquid (such as water or glycol solution) circulates in the heat exchange channel, thereby heating, cooling or constant-temperature controlling the air inside the whole test bench 1, so as to simulate the working conditions of the vehicle in different climate environments, and make the noise test conditions more comprehensive and accurate.

[0047] The application further provides a vehicle air conditioner HVAC assembly noise test method, which tests the noise of the air conditioner HVAC assembly by using the vehicle air conditioner HVAC assembly noise test device according to any one of the above embodiments, and comprises the following steps.

[0048] S1: fixing the air conditioner HVAC assembly on the clamp to form a test whole, putting the test whole into the test bench 1 through the top surface opening 100 of the frame 10, sealing and covering the cover plate 15 on the top surface opening 100, and installing the noise collector above the test bench 1. The noise collector can be a microphone, and the distance between the microphone and the top surface of the cover plate 15 is about 350mm-450mm when the cover plate 15 is sealed and covered on the top surface opening 100. The height can be set according to the required test height to test the noise value radiated from the test bench 1.

[0049] Optionally, the microphone can be installed on an adjustable tripod or a mechanical arm to adjust the vertical height and the horizontal position.

[0050] S2: connecting the air inlet of the air conditioner HVAC assembly with the air inlet 110a of the test bench 1 and sealing the connection, connecting the air conditioner HVAC with the air volume table control, setting the required air volume input into the air inlet 110a through the air volume table, and adjusting the opening degree of the air door opening 111a by adjusting the position of the air baffle 12. In the embodiment of the application, the air volume table can be a controller arranged outside the test bench 1, and the controller is connected with the air blower control to control the operation mode of the air blower and adjust the air volume.

[0051] S3: start the vehicle HVAC assembly noise test device, adjust the air volume according to the blowing mode to test the blowing noise and collect the noise data. In this step, the blowing mode can be selected from the blowing modes provided by the vehicle, i.e. the highest blowing mode, the lowest blowing mode, the face blowing mode, the coldest blowing mode and the internal circulation mode. The above different modes correspond to different air volumes, and the speed of the air blower is adjusted by the regulator.

[0052] In addition, the HVAC is powered on and set to the required blowing mode, and then tested after preheating for 5-10 minutes at the highest voltage.

[0053] S4: after the noise data collection in the blowing mode is completed, the data is processed. In this step, the noise quality is represented by the 1 / 3 octave curve, and the analysis frequency range is 50-10000 Hz.

[0054] In an optional embodiment, the following steps are further included: the distance between the upper surface of the HVAC assembly and the inner top surface of the test bench 1 is set to L1, 150≤L1≤250 mm. The above setting can make the airflow flow smoothly between the upper surface of the HVAC assembly and the inner top surface of the test bench 1. This step can be set in the step S1, after the HVAC test is placed in the test bench 1, the height of the HVAC is adjusted to make the distance between the upper surface of the HVAC assembly and the inner top surface of the test bench 1 between 150 mm and 250 mm.

[0055] In an optional embodiment, the following steps are further included: the air inlet 110a of the test bench 1 is set to three, the air inlet of the HVAC assembly is sealed and connected with one of the corresponding air inlets 110a, and the other two air inlets 110a are sealed by blind plates or plugs. On the air inlet side plate 110, according to the arrangement of common vehicle models, three air inlets 110a are opened at positions with the same height but different horizontal positions. During the test, according to the vehicle model simulated by the tested HVAC assembly, the corresponding air inlet 110a is selected for connection. For example, for a front offset vehicle model, the most lateral air inlet 110a is connected.

[0056] Figure 4 The noise curves measured by the test bench 1 and the test method provided by the present application, the noise curves measured by the traditional test bench and the noise curves in the whole vehicle environment are shown. From the comparison of the three curves, it can be seen that the test bench 1 and the test method provided by the present application can simulate the actual working environment of the HVAC assembly in the whole vehicle environment more accurately, and the test results are more accurate and reliable. Figure 4It can be seen that in the low frequency range, the test bench 1 and the test method provided by the application are obviously closer to the noise curve in the vehicle environment, and can better represent the blowing noise performance trend of the air conditioner HVAC assembly in the vehicle environment, making up for the large difference between the traditional HVAC bench low frequency noise and the actual vehicle performance. The noise trend within 300Hz provided by the application has obvious advantages, and has important guiding significance for the selection of key components related to vehicle blowing noise in the early stage of vehicle project development.

[0057] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A noise testing device for a vehicle air conditioning (HVAC) assembly, characterized in that, include: A test bench for accommodating an air conditioning (HVAC) assembly, with a noise collector mounted on top of the test bench; The test bench includes a frame, side plates are sealed and installed on the sides of the frame, a bottom plate is sealed and installed on the bottom surface of the frame, and a top opening is provided on the top surface of the frame and a rotatable cover plate is connected thereto. When the cover plate is rotated to cover the top opening, it seals the test bench. The side panel includes an air inlet side panel and an air damper side panel respectively disposed on opposite sides of the frame. The air inlet side panel is provided with an air inlet, a pressure detector is installed on the air inlet and connected to the air vent of the air conditioning HVAC assembly. The air damper side panel is provided with an air damper opening, and an air baffle is installed on the side of the air damper opening. The air baffle is slidably disposed to adjust the opening degree of the air damper opening.

2. The vehicle air conditioning (HVAC) assembly noise testing device according to claim 1, characterized in that, The number of air inlets is at least two, the pressure detector is detachably mounted on one of the air inlets, and the remaining air inlets are detachably mounted with sealing baffles.

3. The vehicle air conditioning (HVAC) assembly noise testing device according to claim 1, characterized in that, The pressure detector includes a detection body, on which a pressure sensor is installed. An air inlet is provided inside the detection body, and the outer periphery of the detection body is detachably and sealed to the air inlet.

4. The vehicle air conditioning (HVAC) assembly noise testing device according to claim 1, characterized in that, The upper part of the damper opening is provided with a first slide rail, and the lower part of the damper opening is provided with a second slide rail. The two sides of the air plate are respectively slidably mounted on the first slide rail and the second slide rail.

5. The vehicle air conditioning (HVAC) assembly noise testing device according to claim 1, characterized in that, The noise acquisition device includes a microphone, which is positioned above the test bench.

6. The vehicle air conditioning (HVAC) assembly noise testing device according to claim 1, characterized in that, The cover plate has an inflatable and deflated sealing airbag installed circumferentially on its side wall. After the cover plate covers the top opening, the sealing airbag is inflated and seals against the side wall of the top opening.

7. The vehicle air conditioning (HVAC) assembly noise testing device according to claim 1, characterized in that, The outer wall of the base plate or the side plate is provided with a temperature control interlayer, and a heat exchange channel is provided inside the temperature control interlayer.

8. A bench noise testing method for a vehicle air conditioning (HVAC) assembly, characterized in that, Testing the noise of the air conditioning HVAC assembly using the vehicle air conditioning HVAC assembly noise testing device according to any one of claims 1-7 includes the following steps: The air conditioning HVAC assembly is fixed on the fixture to form a test unit. After the test unit is placed into the test bench through the top opening of the frame, the cover plate is sealed and covered over the top opening. A noise collector is installed on top of the test bench. Connect the air outlet of the air conditioning HVAC assembly to the air inlet of the test bench and seal the connection. Connect the air conditioning HVAC to the air volume control unit. Set the required air volume input to the air inlet through the air volume control unit and adjust the opening of the damper by adjusting the position of the air vane. Start the vehicle air conditioning (HVAC) assembly noise testing device, adjust the air volume according to the blowing mode to conduct blowing noise test and collect noise data; After the noise data for this blowing mode is collected, the data is processed.

9. The vehicle air conditioning (HVAC) assembly bench noise testing method according to claim 8, characterized in that, It also includes the following steps: The distance between the upper surface of the HVAC assembly and the inner top surface of the test bench is set to L1, where 150mm≤L1≤250mm.

10. The vehicle air conditioning (HVAC) assembly bench noise testing method according to claim 8, characterized in that, It also includes the following steps: The test bench has three air inlets. The air outlet of the air conditioning HVAC assembly is sealed to one of the corresponding air inlets, and the other two air inlets are sealed.

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