Fresh air module testing device, system and method

Abstract

The invention discloses a fresh air module testing device, a fresh air module testing system and a fresh air module testing method, and belongs to the technical field of testing. The testing device comprises a testing bin, a testing assembly arranged in the testing bin and a testing controller arranged on the testing bin, wherein the testing assembly comprises a wind speed sensor and an acoustic array; the test controller is electrically connected with the test assembly and is provided with an electric control connecting mechanism extending into the test bin, and the electric control connecting mechanism is used for being connected with the control end of the to-be-tested fresh air module, so that the test controller is in electric control connection with the to-be-tested fresh air module, and the to-be-tested fresh air module can be adjusted to work in different modes; the test controller is connected with the test assembly and can obtain the wind speed and abnormal sound sensing signals of the test assembly. According to the invention, the air speed and abnormal sound of the fresh air module can be subjected to sealing test; therefore, the wind speed and abnormal sound data of the fresh air module under each operation condition can be accurately measured.

Description

Technical Field

[0001] The present invention belongs to the technical field of detection and testing, and specifically relates to a testing device, a testing system and a testing method for detecting wind speed and abnormal sound of a fresh air module. Background Art

[0002] The fresh air module, also known as the fresh air component or fresh air assembly, is a system component used to achieve the exchange of indoor air and outdoor air. It is widely used in air conditioners in hospitals, office buildings, shopping malls, residences and other environments. As an important component of the air conditioner, it is used to help improve the air quality of the corresponding environment.

[0003] Figure 1 The figure shows a fresh air module 50, which has an air outlet 51, a fan blade 52 and an air inlet 53. The fresh air module 5 mainly realizes the circulation and ventilation of indoor and outdoor air by designing the air duct between the air outlet 51 and the air inlet 53 and by using the cooperation between the fan blade and the air duct. In addition, the fresh air module can also filter, disinfect, sterilize and other processes on the air entering the room to ensure the cleanliness and health of the indoor air.

[0004] It can be seen that in the air conditioning system, the performance of the fresh air module directly affects the indoor air quality, comfort and energy saving effect. However, the existing fresh air modules have many challenges in terms of wind speed stability and noise control, especially it is difficult to achieve stable wind speed and low noise under different working conditions. This not only affects the overall performance of the air conditioning system, but may also lead to a decline in user experience.

[0005] At present, the wind speed of the fresh air module is mainly detected by the test personnel on site to make empirical judgments; the abnormal sound of the fresh air module is mainly detected on site by a decibel tester. In addition to requiring high physical strength and proficiency of workers, such a testing process cannot effectively guarantee the time and testing procedures used for the test, and the test results and conclusions are also controversial, which does not meet the requirements of lean production. Summary of the invention

[0006] The purpose of the present invention is to provide a fresh air module testing device, a testing system and a testing method, aiming to improve the testing efficiency of the fresh air module; the present invention is achieved through the following scheme.

[0007] A first aspect of the present invention provides a fresh air module testing device, comprising:

[0008] The test chamber comprises a chamber body, a chamber door, and a bearing member disposed in the chamber body and used for bearing the fresh air module to be tested;

[0009] A test assembly is arranged in the test chamber, comprising: a wind speed sensor for sensing the wind speed of the fresh air module to be tested; and an acoustic array for sensing abnormal sound of the fresh air module to be tested;

[0010] A test controller is arranged on the test chamber and is electrically connected to the test assembly; the test controller has an electrical control connection mechanism extending into the test chamber and used to connect to the control end of the fresh air module to be tested.

[0011] As a preferred technical solution, the front end face of the bin body is open, and the bin door is opened and closed at the front end face opening of the bin body; the bearing member is arranged at the inner bottom of the bin body.

[0012] As a preferred technical solution, it comprises at least four acoustic arrays arranged around the supporting member.

[0013] As a preferred technical solution, at least one of the acoustic arrays is arranged on the warehouse door.

[0014] As a preferred technical solution, at least four of the acoustic arrays are arranged around the carrier through a three-dimensional adjustment bracket, and the directions of at least four of the acoustic arrays cover the air inlet, air outlet and fan blades of the fresh air module to be tested.

[0015] As a preferred technical solution, the wind speed sensor is arranged around the bearing component through a three-dimensional adjustment bracket, and the wind receiving end of the wind speed sensor is configured to face the exhaust port of the fresh air module to be tested.

[0016] As a preferred technical solution, the inner walls of the warehouse body and the warehouse door are provided with sound insulation cotton.

[0017] As a preferred technical solution, the test controller includes:

[0018] A data acquisition module connected to the wind speed sensor and the acoustic array;

[0019] A data processing module connected to the data acquisition module;

[0020] A warning module connected to the data processing module;

[0021] An instruction generation module connected to the data processing module;

[0022] The electric control module is connected to the instruction generating module and is also connected to the electric control connecting mechanism.

[0023] The fresh air module testing device provided by the above technical solution has the following beneficial effects: it can perform a closed test on the wind speed and abnormal sound of the fresh air module; the test controller can obtain the wind speed and abnormal sound sensing signals of the test component by connecting with the test component; the test controller can adjust the fresh air module to be tested to work in different modes (or power levels) by connecting with the electronic control of the fresh air module to be tested; thereby accurately measuring the wind speed and abnormal sound data of the fresh air module under various operating conditions.

[0024] The second aspect of the present invention provides a fresh air module testing system, comprising at least two sets of the fresh air module testing devices described above, and the test controller of each set of the fresh air module testing devices also includes a communication module; the test controller of one set of the fresh air module testing devices is configured as a host, and the test controllers of the other fresh air module testing devices are configured as slaves, and the host is communicatively connected with the slaves.

[0025] As a preferred technical solution, the test controller configured as the host further includes a data storage module and an information display module, which are respectively connected to the data processing module of the test controller configured as the host.

[0026] The fresh air module testing system provided by the above scheme has the beneficial effect of: at least two sets of fresh air module testing devices are formed into a testing system, and the test data of each slave can be collected through the communication connection between the host and other slaves, and the data is stored and further uploaded on the host side; thereby, the wind speed and abnormal sound tests of different working modes of multiple fresh air modules to be tested can be carried out separately, which is more efficient. The fresh air module testing system provided by the present invention has a higher degree of automation, and the data management is more centralized and comprehensive.

[0027] A third aspect of the present invention provides a fresh air module testing method, comprising:

[0028] (1) Setting the sampling frequency of the acoustic array and wind speed sensor of the fresh air module test device described above;

[0029] (2) Conduct at least one of the following tests: wind speed test, sound pressure level test, and abnormal sound test.

[0030] As a preferred technical solution, when conducting wind speed tests, in each fresh air condition, the wind speed curve of the entire operation process is obtained through a wind speed sensor, and the maximum, minimum, average and standard deviation of the wind speed curve are calculated to evaluate the overall level and fluctuation of the wind speed in each condition.

[0031] As a preferred technical solution, when conducting a sound pressure level test, under each fresh air condition, the A-weighted sound pressure level at each acoustic array is calculated at fixed time intervals to obtain the sound pressure level curve of the corresponding acoustic array, and the maximum, minimum, average and standard deviation of each curve are calculated to evaluate the overall level and fluctuation of the sound pressure level under each condition and at each position.

[0032] As a preferred technical solution, the abnormal sound test specifically includes:

[0033] ②Build a deep neural network including feature extractor, decoder and prototype-based classifier;

[0034] ②Use the sound signal as the input of the feature extractor to extract learning features; at the same time, extract traditional time domain, frequency domain, and time-frequency domain features from the sound signal x;

[0035] ③ Take the learned features as the input of the decoder, reconstruct the sound signal x, and calculate the reconstruction error; at the same time, take the learned features and traditional features as the input of the prototype classifier, calculate the similarity between the sample and the prototype, and further calculate the confidence that the sample is an abnormal sample;

[0036] ④ Use positive and abnormal samples to train the model, optimize the parameters of the feature extractor, decoder, and prototype classifier, improve the model's ability to reconstruct normal samples, and improve the effectiveness of prototype and category confidence;

[0037] ⑤ Evaluate whether the fresh air module is abnormal through the reconstruction error and category confidence of the sample.

[0038] The beneficial effect of the fresh air module testing method provided by the above scheme is that it can accurately measure and analyze the wind speed curve and abnormal sound level of the fresh air module under various operating conditions, provide a complete set of testing and evaluation methods, help optimize the fresh air module operation mode and structural design, thereby improving the wind speed control accuracy and abnormal sound performance of the fresh air module, and provide users with a more comfortable and energy-saving experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a structural diagram of a fresh air module.

[0040] Figure 2 A schematic diagram of the structure of a fresh air module testing device provided in a specific embodiment of the present invention.

[0041] Figure 3 A detailed schematic diagram of a fresh air module testing device provided for a specific embodiment of the present invention.

[0042] Figure 4 A block diagram of the structure of a test controller in a fresh air module test device provided in a specific embodiment of the present invention.

[0043] Figure 5 A schematic diagram of the structure of a fresh air module testing system provided for a specific implementation of the present invention.

[0044] Figure 6 A block diagram of the structure of a test controller serving as a host in a fresh air module test system provided in a specific embodiment of the present invention.

[0045] Figure 7 A flow chart of wind speed testing in a fresh air module testing method provided in a specific implementation manner of the present invention.

[0046] Figure 8 A flow chart of the sound pressure level test in the fresh air module test method provided in a specific embodiment of the present invention.

[0047] Fig. 9 A flowchart of abnormal sound testing in a fresh air module testing method provided in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0048] The technical solutions of the embodiments of the present invention are explained and illustrated below in conjunction with the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, not all. In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "front", "back", etc., indicating directions or positional relationships, are all based on the directions or relative positional relationships shown in the drawings, and are intended to facilitate a clear description of the structure of the product or device, and are not used to limit the actual directions of the product or device during production, use, sales, etc.

[0049] In addition, the terms "first" and "second" are only used for the purpose of distinction in the description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more, unless otherwise clearly defined.

[0050] The specific implementation modes of the present invention are described in detail below with reference to the accompanying drawings. The technical features of each specific implementation mode can be used interchangeably without conflicting with each other.

[0051] Combination Figure 2 and Figure 3As shown, a fresh air module testing device 100 provided in this embodiment is used to detect the wind speed and abnormal sound of the fresh air module; the fresh air module testing device 100 includes: a testing chamber 10, a testing component 20 and a testing controller 30.

[0052] The test chamber 10 includes a chamber body 11, a chamber door 12 and a bearing member 13. The bearing member 13 is disposed in the chamber body 11 and is used to bear the fresh air module to be tested. Figure 1 The fresh air module 50 is shown. Specifically, the warehouse body 11 is a square warehouse, the front end of the warehouse body 11 is open, the warehouse door 12 is openably arranged at the opening of the front end of the warehouse body 11, and the bearing member 13 is arranged at the bottom of the warehouse body 11.

[0053] The test component 20 is arranged in the test chamber 10, and the test component 20 includes a wind speed sensor 21 and an acoustic array 22; the wind speed sensor 21 is used to sense the wind speed of the fresh air module 50 to be tested, and the acoustic array 22 is used to sense the abnormal sound of the fresh air module 50 to be tested.

[0054] The test controller 30 is disposed above the test chamber 10 and is electrically connected to the test assembly 20. The two cooperate to test the fresh air module 50 to be tested in the test chamber 10. The test controller 30 includes a controller body and an electric control connection mechanism (not shown in the figure). The controller body is used to control the test process. The electric control connection mechanism is used to extend into the test chamber 10 and connect to the control end of the fresh air module 50 to be tested, so as to adjust the working mode of the fresh air module 50, for example, to control the fresh air module 50 to be tested to work in high, medium and low gears respectively.

[0055] The fresh air module testing device 100 provided in this embodiment further includes a transfer rack 40 , on which the testing chamber 10 is fixedly disposed. The transfer rack 40 has moving wheels to facilitate the movement of the entire fresh air module testing device 100 .

[0056] The acoustic array 22 is composed of a plurality of miniature microphones arranged in an array, and is used to collect abnormal sounds of the fresh air module 50 to be tested under different working conditions. As a preferred embodiment, in the fresh air module test device 100 provided in this embodiment, the test assembly 20 includes four acoustic arrays 22, which are arranged around the carrier 13. Among them, one acoustic array 22 is arranged on the door 12, and when the door is closed, the acoustic array 22 is located in front of the carrier 13. In addition, the other three acoustic arrays 22 are arranged on the left, right, and rear of the carrier 13, respectively.

[0057] Four acoustic arrays 22 are arranged around the bearing member through three-dimensional adjustment brackets, so that the height and angle thereof can be adjusted so that the four acoustic arrays 22 are oriented to cover the air inlet, air outlet and fan blade of the fresh air module to be tested. Thus, abnormal sounds at the air outlet, air inlet, fan blade and other locations prone to noise are collected, and the overall noise of the fresh air module 50 to be tested can be better and more comprehensively collected.

[0058] In addition, the wind speed sensor 21 is disposed on the periphery of the supporting member 13 through a three-dimensional adjustment bracket, and the wind receiving end of the wind speed sensor 21 faces the exhaust port of the fresh air module 50 to be tested.

[0059] In order to eliminate the interference of external airflow and noise, the test needs to be carried out in a soundproof environment. In this embodiment, the inner walls of the warehouse body 11 and the warehouse door 12 are provided with soundproof cotton 15. As a preferred embodiment, the five panels (upper, lower, left, right and back) of the warehouse door 12 and the warehouse body 11 have the same thickness and structure, and are all provided with soundproof cotton 15 with sound-absorbing structure (sound-absorbing holes).

[0060] Combination Figure 4 As shown, the test controller 30 includes: a data acquisition module, a data processing module, a warning module, an instruction generation module and an electronic control module. The data acquisition module is connected to the wind speed sensor 21 and the acoustic array 22, and is used to collect sensing signals from the wind speed sensor 21 and the acoustic array 22. The data processing module is connected to the data acquisition module, and is used to analyze and process the collected data to determine whether there is an abnormality in the detection data. The warning module is connected to the data processing module to alarm for abnormal detection data. The instruction generation module is connected to the data processing module, and is used to receive control information input by the user and generate corresponding control instructions. The electronic control module is connected to the instruction generation module, and is also connected to the electronic control connection mechanism, and is used to respond to control instructions, thereby controlling the working mode of the fresh air module 50 to be tested.

[0061] The fresh air module testing device 100 provided in the above embodiment can perform a closedness test on the wind speed and abnormal sound of the fresh air module 50; the test controller 30 can obtain the wind speed and abnormal sound sensing signals of the test component 20 by connecting with the test component 20, and analyze and process them; the test controller 30 can adjust the fresh air module 50 to work in different modes by electrically connecting with the fresh air module 50 to be tested, thereby accurately measuring the wind speed and abnormal sound data of the fresh air module under various operating conditions.

[0062] See also Figure 5 As shown, this embodiment also provides a fresh air module testing system, including at least two sets of fresh air module testing devices 100 described above. Figure 6As shown, the test controller 30 of each fresh air module test device also includes a communication module; wherein the test controller of the first fresh air module test device 100 is configured as a host, and the test controllers 30 of other fresh air module test devices 100 are configured as slaves, and the host is communicatively connected with the slaves.

[0063] Continue to see Figure 6 The test controller 30 configured as a host also includes a data storage module and an information display module, which are respectively connected to the data processing module of the host.

[0064] The fresh air module test system provided by the above scheme combines at least two sets of fresh air module test devices into a test system. Through the communication connection between the host and other slaves, the test data of each slave can be collected, and the data can be stored and further uploaded on the host side; thereby, the wind speed and abnormal sound tests can be carried out on different working modes of multiple fresh air modules to be tested, with a higher degree of automation, higher efficiency, and more centralized and comprehensive data management.

[0065] In addition, based on the above-mentioned fresh air module testing device 100, this embodiment also provides a fresh air module testing method, including:

[0066] (1) The sampling frequency of the acoustic array 22 and the wind speed sensor 21 is set, for example, the sampling frequency is 48 kHz.

[0067] (2) Conduct at least one of the following tests: wind speed test, sound pressure level test, or abnormal sound test:

[0068] When the test starts, the fresh air module in the test chamber will start to operate, and the four acoustic arrays 22 will respectively receive the noise signals of the fresh air module air inlet, fresh air module air outlet, and fresh air module fan blades in each fresh air working condition, and then convert the received signal into a sound pressure curve through signal conversion and send it to the electronic control host, which analyzes and calculates the curve, and finally evaluates and automatically outputs the test results. If the test results do not meet the standards, they are automatically sent to the alarm device in the control box for alarm. The wind speed test is synchronized with the noise test through the wind speed sensor 21 set at the air outlet of the fresh air module to collect data, collect wind speed data of the entire operation process under each working condition, transmit the collected data signal to the electronic control host and pre-process the data (such as removing outliers, etc.), and then calculate and analyze the output results based on the data. If the test results do not meet the standards, they are automatically sent to the alarm device in the control box for alarm.

[0069] 2.1. Wind speed test:

[0070] The process of wind speed test is as follows: Figure 7As shown, in each fresh air condition, the wind speed curve of the entire operation process is obtained by the wind speed sensor, and the maximum value, minimum value, average value and standard deviation of the wind speed curve are calculated to evaluate the overall level and fluctuation of the wind speed in each condition.

[0071] 2.2. Sound pressure level test:

[0072] Since the human ear has different sensitivities to sounds of different frequencies, in order to obtain a sound pressure level close to the human ear's hearing perception and considering the frequency response characteristics of the human ear to sound, the A-weighted sound pressure level is used to evaluate the noise level of the fresh air module.

[0073] The process of sound pressure level test is as follows: Figure 8 As shown, in each fresh air condition, the A-weighted sound pressure level at each acoustic array is calculated at fixed time intervals to obtain four sound pressure level curves corresponding to the four acoustic arrays. The maximum, minimum, average and standard deviation of each curve are calculated to evaluate the overall level and fluctuation of the sound pressure level in each condition and at each position.

[0074] 2.3. Abnormal sound test:

[0075] The abnormal sound test of the fresh air module is carried out by combining machine learning and traditional feature engineering. The schematic diagram is as follows Fig. 9 shown.

[0076] ①Build a deep neural network (feature extractor, decoder) and a prototype-based classifier.

[0077] ② Use the sound signal as the input of the feature extractor to extract learning features; at the same time, extract traditional time domain, frequency domain, and time-frequency domain features from the sound signal x.

[0078] ③ Use the learned features as the input of the decoder, reconstruct the sound signal x, and calculate the reconstruction error; at the same time, use the learned features and traditional features as the input of the prototype classifier, calculate the similarity between the sample and the prototype (normal sample), and further calculate the confidence that the sample is an abnormal sample.

[0079] ④ Use positive and abnormal samples to train the model, optimize the parameters of the feature extractor, decoder, and prototype classifier, and improve the model's ability to reconstruct normal samples, as well as the effectiveness of prototype and category confidence.

[0080] ⑤ Evaluate whether the fresh air module is abnormal through the reconstruction error and category confidence of the sample.

[0081] The above disclosure is only the preferred embodiment of the present application, which certainly cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A fresh air module testing device, characterized in that: include: The test chamber includes a chamber body, a chamber door, and a bearing member disposed in the chamber body for bearing the fresh air module to be tested; A test assembly is arranged in the test chamber, comprising: a wind speed sensor for sensing the wind speed of the fresh air module to be tested; and an acoustic array for sensing abnormal sound of the fresh air module to be tested; A test controller is arranged on the test chamber and is electrically connected to the test assembly; the test controller has an electrical control connection mechanism extending into the test chamber and used to connect to the control end of the fresh air module to be tested.

2. The fresh air module testing device according to claim 1, characterized in that: The front end face of the bin body is open, and the bin door is opened and closed at the front end face opening of the bin body; the bearing member is arranged at the inner bottom of the bin body.

3. The fresh air module testing device according to claim 1, characterized in that: It comprises at least four acoustic arrays arranged around the supporting member.

4. The fresh air module testing device according to claim 3, characterized in that: At least one of the acoustic arrays is disposed on the cabin door.

5. The fresh air module testing device according to claim 4, characterized in that: At least four of the acoustic arrays are arranged around the bearing member through a three-dimensional adjustment bracket, and the directions of the at least four acoustic arrays cover the air inlet, air outlet and fan blade of the fresh air module to be tested.

6. The fresh air module testing device according to claim 1, characterized in that: The wind speed sensor is arranged around the bearing component through a three-dimensional adjustment bracket, and the wind receiving end of the wind speed sensor is configured to face the exhaust port of the fresh air module to be tested.

7. The fresh air module testing device according to claim 1, characterized in that: The inner walls of the warehouse body and the warehouse door are provided with sound insulation cotton.

8. The fresh air module testing device according to any one of claims 1 to 7, characterized in that: The test controller comprises: A data acquisition module connected to the wind speed sensor and the acoustic array; A data processing module connected to the data acquisition module; A warning module connected to the data processing module; An instruction generation module connected to the data processing module; The electric control module is connected to the instruction generating module and is also connected to the electric control connecting mechanism.

9. A fresh air module testing system, characterized in that: It comprises at least two sets of the fresh air module test devices as described in any one of claims 1 to 8, and the test controller of each set of the fresh air module test devices also includes a communication module; the test controller of one set of the fresh air module test devices is configured as a host, and the test controllers of the other fresh air module test devices are configured as slaves, and the host is communicatively connected with the slaves.

10. The fresh air module testing system according to claim 9, characterized in that: The test controller configured as the host further includes a data storage module and an information display module, which are respectively connected to the data processing module of the test controller configured as the host.

11. A fresh air module testing method, characterized in that: include: (1) Setting the sampling frequency of the acoustic array and wind speed sensor of the fresh air module test device according to any one of claims 1 to 8; (2) Conduct at least one of the following tests: wind speed test, sound pressure level test, and abnormal sound test.

12. The fresh air module testing method according to claim 11, characterized in that: When conducting a wind speed test, in each fresh air condition, the wind speed curve of the entire operation process is obtained through the wind speed sensor, the maximum value, minimum value, average value and standard deviation of the wind speed curve are calculated, and the overall level and fluctuation of the wind speed in each condition are evaluated.

13. The fresh air module testing method according to claim 11, characterized in that: When conducting the sound pressure level test, under each fresh air condition, the A-weighted sound pressure level at each of the acoustic arrays is calculated at fixed time intervals to obtain the sound pressure level curve of the corresponding acoustic array, and the maximum, minimum, average and standard deviation of each curve are calculated to evaluate the overall level and fluctuation of the sound pressure level under each condition and at each position.

14. The fresh air module testing method according to claim 11, characterized in that: When conducting abnormal sound test, it includes: ①Build a deep neural network including feature extractor, decoder and prototype-based classifier; ②Use the sound signal as the input of the feature extractor to extract learning features; at the same time, extract traditional time domain, frequency domain, and time-frequency domain features from the sound signal x; ③ Take the learned features as the input of the decoder, reconstruct the sound signal x, and calculate the reconstruction error; at the same time, take the learned features and traditional features as the input of the prototype classifier, calculate the similarity between the sample and the prototype, and further calculate the confidence that the sample is an abnormal sample; ④ Use positive and abnormal samples to train the model, optimize the parameters of the feature extractor, decoder, and prototype classifier, improve the model's ability to reconstruct normal samples, and improve the effectiveness of prototype and category confidence; ⑤ Evaluate whether the fresh air module is abnormal through the reconstruction error and category confidence of the sample.

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