A device and method for testing automobile refrigerant flow noise

Abstract

The present invention relates to a vehicle refrigerant flow noise test device and method, belonging to the field of automobile air conditioning system noise test, the device includes an enthalpy difference performance platform, and a collection and analysis system, a noise reduction system and a tested air conditioner arranged therein. The enthalpy difference performance platform includes a first evaporation chamber, a second evaporation chamber and a condensation chamber that are isolated from each other, and a refrigeration / heating system and a controller thereof that are arranged outside the first evaporation chamber, the second evaporation chamber or the condensation chamber. The controller controls the refrigeration / heating system to provide ambient temperature and humidity to the first evaporation chamber, the second evaporation chamber and the condensation chamber, thereby ensuring that the ambient background noise is small during the noise test, while introducing ambient temperature and humidity control factors, more realistically simulating the situation where noise occurs in the refrigerant flow during the operation of the actual vehicle.

Description

Technical Field

[0001] The invention belongs to the field of automobile air-conditioning system noise testing, and relates to an automobile refrigerant flow noise testing device and method. Background Art

[0002] Air conditioning is an important component of a car. During the refrigerant flow noise test phase of a traditional car air-conditioning system, the ambient noise floor is only guaranteed to be ≤38dB, and no clear requirements are made for ambient temperature and humidity.

[0003] When the automobile air conditioner is operating in real road conditions, it is affected by environmental factors such as seasons and regions (temperature, humidity, compressor speed), which will affect the refrigerant pressure inside the automobile air-conditioning system. The current refrigerant flow noise test method does not control the ambient temperature and humidity, resulting in the traditional refrigerant flow noise test process not being simulated, and noise occurs in the refrigerant flow during actual vehicle operation. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a vehicle refrigerant flow noise testing device and method to solve the problem that the traditional vehicle refrigerant flow noise test cannot simulate the actual situation due to the lack of control of the ambient temperature and humidity.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A vehicle refrigerant flow noise test device comprises an enthalpy difference performance platform, a collection and analysis system, a noise reduction system and an air conditioner to be tested; the enthalpy difference performance platform comprises a first evaporation chamber, a second evaporation chamber and a condensation chamber which are isolated from each other, and a refrigeration / heating system and a controller thereof which are arranged outside the first evaporation chamber, the second evaporation chamber or the condensation chamber; the air conditioner to be tested comprises a condenser, a compressor and an evaporator, the condenser is connected to the evaporator through one refrigerant pipeline, and is connected to the evaporator through another refrigerant pipeline via the compressor; an air duct is arranged in the condensation chamber, the compressor and condenser of the air conditioner to be tested are arranged in the condensation chamber, and the condenser is connected to the air duct; the noise reduction system and the collection and analysis system are respectively arranged in two different evaporation chambers and are connected to each other, and the evaporator of the air conditioner to be tested is arranged in the noise reduction system; the refrigeration / heating system is controlled by the controller to provide ambient temperature and humidity to the first evaporation chamber, the second evaporation chamber and the condensation chamber.

[0007] Furthermore, the acquisition and analysis system includes a dynamic thermomechanical analyzer, a noise collection microphone, a head acoustic multi-channel data acquisition system and a head acoustic data analysis software; the dynamic thermomechanical analyzer and the noise collection microphone are arranged in the noise reduction system, the dynamic thermomechanical analyzer is in contact with the evaporator, the head acoustic data analysis software is arranged in an evaporation chamber different from the noise reduction system, and the signal line of the head acoustic multi-channel data acquisition system runs through the two evaporation chambers, one end is connected to the dynamic thermomechanical analyzer and the noise collection microphone, and the other end is connected to the head acoustic data analysis software, receives the information collected by the dynamic thermomechanical analyzer and the noise collection microphone, transmits it to the head acoustic data analysis software for analysis, and obtains the noise test decibel value.

[0008] Furthermore, the noise collecting microphone is installed at a horizontal distance of 10 mm from the evaporator through a supporting frame.

[0009] Furthermore, the noise reduction system includes a soundproof room surrounded by soundproof panels, a silencer arranged outside the soundproof room and connected to the soundproof room, an insulation pipe connected to the silencer at one end, a resonance silencer chamber connected to the other end of the insulation pipe, and a blower connected to the resonance silencer chamber; the evaporator is arranged in the soundproof room; the ambient temperature and humidity of the evaporation chamber are sucked by the blower, and the ambient temperature and humidity required for the test are provided to the soundproof room through the resonance silencer chamber, the insulation pipe and the silencer in turn.

[0010] Furthermore, the air conditioner under test also includes an expansion valve, which is installed on two refrigerant pipelines connected to the evaporator and is arranged in the noise reduction system.

[0011] Furthermore, one or all of the first evaporation chamber and the second evaporation chamber and the condensation chamber are provided with openable and closable doors, and openable and closable doors are also provided between the first evaporation chamber, the second evaporation chamber and the condensation chamber.

[0012] A method for testing the flow noise of automobile refrigerant, using the automobile refrigerant flow noise testing device as described in any one of the above items, comprises the following steps:

[0013] Debug the test conditions: turn on the enthalpy difference performance bench, and use the controller to adjust and output the test conditions required for the test according to the test requirements. The cooling / heating system receives the output of the controller and adjusts the ambient temperature and humidity of the first evaporation chamber, the second evaporation chamber, and the condensation chamber;

[0014] Test noise: The noise test decibel value of the air conditioner under test is tested through the acquisition and analysis system to simulate the noise caused by the flow of air-conditioning refrigerant in the actual operation of the car.

[0015] Furthermore, the ambient noise floor within the noise reduction system is controlled at ≤38dB.

[0016] Furthermore, the control accuracy of the ambient temperature is ±0.3°C, and the control accuracy of the ambient humidity is ±3%RH.

[0017] The beneficial effects of the present invention are:

[0018] While ensuring the ambient noise floor through the noise reduction system, the enthalpy difference performance table provides ambient temperature and humidity for noise testing, more realistically simulating the noise caused by the flow of refrigerant during actual vehicle operation.

[0019] The control accuracy of ambient temperature is ±0.3℃, and the control accuracy of ambient humidity is ±3%RH, providing a low-cost, high-standard noise testing solution.

[0020] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0022] Figure 1 It is a schematic diagram of the overall arrangement of the automobile refrigerant flow noise testing device of the present invention;

[0023] Figure 2 Schematic diagram of the noise reduction system layout.

[0024] Figure numerals: first evaporation chamber 1, second evaporation chamber 2, air duct 3, condensation chamber 4, controller 5, cooling / heating system 6, dynamic thermomechanical analyzer 7, noise collection microphone 8, head acoustic multi-channel data acquisition system 9, head acoustic data analysis software 10, soundproof room 11, soundproof board 12, muffler 13, insulation pipe 14, resonance muffler chamber 15, blower 16, refrigerant pipeline 17, condenser 18, compressor 19, expansion valve 20, evaporator 21. DETAILED DESCRIPTION

[0025] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0026] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0027] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0028] See also Figure 1 and Figure 2 , which is a vehicle refrigerant flow noise testing device, including an enthalpy difference performance platform, a collection and analysis system, a noise reduction system and the air conditioner under test.

[0029] The enthalpy difference performance table includes a first evaporation chamber 1, a second evaporation chamber 2 and a condensation chamber 4 which are isolated from each other, and a cooling / heating system and a controller 5 thereof which are arranged outside the second evaporation chamber 2. The cooling / heating system is controlled by the controller 5 to provide ambient temperature and humidity to the first evaporation chamber 1, the second evaporation chamber 2 and the condensation chamber 4. The second evaporation chamber 2 and the condensation chamber 4 are respectively provided with doors that can be opened and closed to facilitate entry and exit of the corresponding spaces. There are also doors that can be opened and closed between the first evaporation chamber 1, the second evaporation chamber 2 and the condensation chamber 4 to facilitate switching in and out of the three spaces.

[0030] The tested air conditioner includes a condenser 18 (simulating the environmental conditions of the engine compartment under different scenarios), a compressor 19 (adjusting the speed of the compressor 19 to simulate the operation of the air conditioner mode under different conditions), an evaporator 21 (also called an air conditioner box) and an expansion valve 20. The condenser 18 is connected to the evaporator 21 through one refrigerant pipeline 17, and is connected to the evaporator 21 through another refrigerant pipeline 17 via the compressor 19. The expansion valve 20 is installed on the two refrigerant pipelines 17 connected to the evaporator 21.

[0031] An air duct 3 is provided in the condensation chamber 4 , a compressor 19 and a condenser 18 of the tested air conditioner are provided in the condensation chamber 4 , and the condenser 18 is communicated with the air duct 3 .

[0032] The noise reduction system is arranged in the first evaporation chamber 1, including a soundproof room 11 surrounded by a soundproof board 12, a muffler 13 arranged outside the soundproof room 11 and connected to the soundproof room 11, a heat preservation pipe 14 connected to the muffler 13 at one end, a resonance muffler chamber 15 connected to the other end of the heat preservation pipe 14, and a blower 16 connected to the resonance muffler chamber 15. The length, width and height of the internal space of the soundproof room 11 are ≥1.4*1.4*2.16m. The evaporator 21 and the expansion valve 20 of the tested air conditioner are arranged in the soundproof room 11.

[0033] The ambient temperature and humidity of the first evaporation chamber 1 are sucked by the blower 16, and the ambient temperature and humidity required for the test are provided to the soundproof room 11 through the resonance silencer chamber 15, the insulation pipe 14 and the silencer 13. The soundproof room 11 provides a silent test chamber, the silencer 13 eliminates the noise caused by the vibration source of the insulation pipe 14, and the resonance silencer chamber 15 cuts off or slows down the noise transmitted by the blowing vibration of the blower 16.

[0034] The collection and analysis system includes a dynamic thermomechanical analyzer 7 (Artemis analyzer is used in this embodiment), a noise collection microphone 8, a head acoustic multi-channel data collection system 9 and a head acoustic data analysis software 10; the dynamic thermomechanical analyzer 7 and the noise collection microphone 8 are arranged in a soundproof room 11, the dynamic thermomechanical analyzer 7 is in contact with the evaporator 21 (the vibration spectrum of the evaporator 21 is collected by a three-axis vibration sensor and transmitted to the analyzer), and the noise collection microphone 8 is installed at a horizontal distance of 10 mm from the evaporator 21 through a support frame; the head acoustic data analysis software 10 is arranged in the second evaporation chamber 2, and the signal line of the head acoustic multi-channel data acquisition system 9 runs through the two evaporation chambers, one end is connected to the dynamic thermomechanical analyzer 7 and the noise collection microphone 8, and the other end is connected to the head acoustic data analysis software 10, receives the information collected by the dynamic thermomechanical analyzer 7 and the noise collection microphone 8, and transmits it to the head acoustic data analysis software 10 for analysis to obtain the noise test decibel value.

[0035] The testing method of the automobile refrigerant flow noise testing device comprises the following steps:

[0036] S1. Pre-treatment:

[0037] S101. Install the noise reduction system: in the first evaporation chamber 1, a soundproof room 11 with an internal space length, width and height of ≥1.4*1.4*2.16m is enclosed by the soundproof board 12, and then the silencer 13, the insulation pipe 14, the resonance silencer chamber 15 and the blower 16 are installed in sequence; ensure that the ambient noise floor in the soundproof room 11 is ≤38dB;

[0038] S102. Install the tested air conditioner: The compressor 19 and the condenser 18 are fixed in the condensing chamber 4, the condenser 18 is inserted into the air duct 3 and communicates with the air duct 3, the evaporator 21 is installed in the soundproof room 11, and the condenser 18, the compressor 19 and the evaporator 21 are connected with the refrigerant pipe 17;

[0039] S103. Install the acquisition and analysis system: attach the dynamic thermomechanical analyzer 7 to the surface of the evaporator 21, install the noise collection microphone 8 at a horizontal distance of 10 mm from the evaporator 21 through a support frame, set the head acoustic data analysis software 10 in the second evaporation chamber 2, and the signal line of the head acoustic multi-channel data acquisition system 9 passes through the two evaporation chambers, one end is connected to the dynamic thermomechanical analyzer 7 and the noise collection microphone 8, and the other end is connected to the head acoustic data analysis software 10;

[0040] S2. Debugging test conditions: Turn on the enthalpy difference performance bench, and according to the test requirements, use the controller 5 to adjust and output the test conditions required for the test. The cooling / heating system receives the output of the controller 5 and adjusts the ambient temperature and humidity of the first evaporation chamber 1, the second evaporation chamber 2, and the condensation chamber 4; the control accuracy of the ambient temperature is ±0.3°C, and the control accuracy of the ambient humidity is ±3%RH;

[0041] S3. Test noise: The information of the expansion valve 20, the refrigerant pipeline 17 or the evaporator 21 is collected by the dynamic thermomechanical analyzer 7 and the noise collection microphone 8. The head acoustic multi-channel data acquisition system 9 receives the information collected by the dynamic thermomechanical analyzer 7 and the noise collection microphone 8, and transmits it to the head acoustic data analysis software 10. The head acoustic data analysis software 10 obtains the noise test decibel value according to the collected information, simulating the noise generated by the flow of air-conditioning refrigerant under actual operation of the car.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A vehicle refrigerant flow noise testing device, characterized in that: It includes an enthalpy difference performance platform, a collection and analysis system, a noise reduction system and an air conditioner under test; the enthalpy difference performance platform includes a first evaporation chamber, a second evaporation chamber and a condensation chamber which are isolated from each other, and a refrigeration / heating system and a controller thereof which are arranged outside the first evaporation chamber, the second evaporation chamber or the condensation chamber; the air conditioner under test includes a condenser, a compressor and an evaporator, the condenser is connected to the evaporator through one refrigerant pipeline, and is connected to the evaporator through another refrigerant pipeline via the compressor; an air duct is arranged in the condensation chamber, the compressor and condenser of the air conditioner under test are arranged in the condensation chamber, and the condenser is connected to the air duct; the noise reduction system and the collection and analysis system are respectively arranged in two different evaporation chambers and are connected to each other, and the evaporator of the air conditioner under test is arranged in the noise reduction system; the refrigeration / heating system is controlled by the controller to provide ambient temperature and humidity to the first evaporation chamber, the second evaporation chamber and the condensation chamber; The air conditioner under test also includes an expansion valve, which is installed on two refrigerant pipelines connected to the evaporator and is set in the noise reduction system; One or all of the first evaporation chamber and the second evaporation chamber and the condensation chamber are provided with doors that can be opened and closed, and doors that can be opened and closed are also provided between the first evaporation chamber, the second evaporation chamber and the condensation chamber.

2. The automobile refrigerant flow noise testing device according to claim 1, characterized in that: The acquisition and analysis system includes a dynamic thermomechanical analyzer, a noise collection microphone, a head acoustic multi-channel data acquisition system and a head acoustic data analysis software; the dynamic thermomechanical analyzer and the noise collection microphone are arranged in the noise reduction system, the dynamic thermomechanical analyzer is in contact with the evaporator, the head acoustic data analysis software is arranged in an evaporation chamber different from the noise reduction system, and the signal line of the head acoustic multi-channel data acquisition system runs through the two evaporation chambers, one end is connected to the dynamic thermomechanical analyzer and the noise collection microphone, and the other end is connected to the head acoustic data analysis software, receives the information collected by the dynamic thermomechanical analyzer and the noise collection microphone, transmits it to the head acoustic data analysis software for analysis, and obtains the noise test decibel value.

3. The automobile refrigerant flow noise testing device according to claim 2, characterized in that: The noise collection microphone is installed at a horizontal distance of 10 mm from the evaporator through a support frame.

4. The automobile refrigerant flow noise testing device according to claim 1, characterized in that: The noise reduction system includes a soundproof room surrounded by soundproof panels, a silencer arranged outside the soundproof room and connected to the soundproof room, a heat preservation pipe connected to the silencer at one end, a resonance silencer cavity connected to the other end of the heat preservation pipe, and a blower connected to the resonance silencer cavity; the evaporator is arranged in the soundproof room; the ambient temperature and humidity of the evaporation chamber are sucked by the blower, and the ambient temperature and humidity required for the test are provided to the soundproof room through the resonance silencer cavity, the heat preservation pipe and the silencer in turn.

5. A method for testing automobile refrigerant flow noise, characterized in that: The automobile refrigerant flow noise testing device according to any one of claims 1 to 4 is used, comprising the following steps: Debug the test conditions: turn on the enthalpy difference performance bench, and use the controller to adjust and output the test conditions required for the test according to the test requirements. The cooling / heating system receives the output of the controller and adjusts the ambient temperature and humidity of the first evaporation chamber, the second evaporation chamber, and the condensation chamber; Test noise: The noise test decibel value of the air conditioner under test is tested through the acquisition and analysis system to simulate the noise caused by the flow of air-conditioning refrigerant in the actual operation of the car.

6. The automobile refrigerant flow noise testing method according to claim 5, characterized in that: The ambient noise floor within the noise reduction system is controlled at ≤38dB.

7. The automobile refrigerant flow noise testing method according to claim 5, characterized in that: The control accuracy of ambient temperature is ±0.3℃, and the control accuracy of ambient humidity is ±3%RH.

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