PM2.5 dust sensor testing equipment

Abstract

The utility model discloses PM2.5 dust sensor testing equipment, and aims to provide PM2.5 dust sensor testing equipment which can provide a stable dust sensor testing environment so as to improve the detection precision; the PM2.5 dust sensor testing equipment can meet the requirements of mass production detection of dust sensors. The device comprises a test cabin body which is provided with a cabin door; the smoke generating unit is used for providing smoke for the test cabin body; testing the computer; the dust detector is used for collecting the PM2.5 smoke concentration value in the test cabin body and is electrically connected with the test computer; and the at least one test frame comprises a data acquisition board and a plurality of sensor interfaces which are arranged and distributed and are used for installing PM2.5 dust sensors, the sensor interfaces are electrically connected with the data acquisition board, and the data acquisition board is electrically connected with the test computer.

Description

Technical Field

[0001] The utility model relates to the field of dust sensor testing, and particularly to a PM2.5 dust sensor testing device. Background Art

[0002] With the continuous improvement of people's living conditions and the emphasis on human health, it is very necessary to monitor the PM2.5 dust concentration value in the atmospheric environment. At present, dust sensors are widely used in environmental monitoring systems, air fresh systems, and air purifiers. With the popularization of new energy vehicles, monitoring PM2.5 in the vehicle cabin has also become a standard configuration for new energy vehicles. As the application scenarios of PM2.5 dust sensors become more and more extensive, on the one hand, the demand for dust sensors increases sharply; on the other hand, the detection accuracy requirements for dust sensors are getting higher and higher.

[0003] As a new technology industry, with the sharp increase in demand and the higher and higher detection accuracy requirements, a test environmental chamber for testing the accuracy of dust sensors is required to test the product performance and accuracy before the production and shipment of dust sensors to detect whether the dust sensors are qualified and meet the requirements. However, the current test environmental chambers for dust sensors have the following deficiencies: First, they are only suitable for testing a small number of dust sensors and cannot meet the mass production detection needs of dust sensors; second, they do not provide a stable test environment for dust sensors, which affects the detection accuracy. Summary of the Utility Model

[0004] The first object of the utility model is to provide a PM2.5 dust sensor testing device that can not only provide a stable test environment for dust sensors to improve the detection accuracy, but also meet the mass production detection needs of dust sensors.

[0005] Another object of the utility model is to provide a PM2.5 dust sensor testing device that can change the smoke concentration value in the test chamber to meet the detection needs of dust sensors in different pollution environments.

[0006] The technical solution of the utility model is as follows:

[0007] A PM2.5 dust sensor testing device includes:

[0008] A test chamber body with a chamber door thereon;

[0009] A smoke generating unit for providing smoke in the test chamber body;

[0010] A test computer;

[0011] A dust detector for collecting the PM2.5 smoke concentration value in the test chamber body and being electrically connected to the test computer;

[0012] At least one test rack, which includes a data acquisition board and several sensor interfaces arranged and distributed for installing PM2.5 dust sensors. The sensor interfaces are electrically connected to the data acquisition board, and the data acquisition board is electrically connected to a test computer. The specific operation of a PM2.5 dust sensor test device in this solution is as follows.

[0013] Install the PM2.5 dust sensor to be detected on the sensor interface (one PM2.5 dust sensor is installed on one sensor interface) so that the PM2.5 dust sensor is electrically connected to the data acquisition board. During actual testing, according to mass production requirements, one or more test racks can be placed in the test chamber, and several PM2.5 dust sensors can be installed on each test rack; thus, a large number of PM2.5 dust sensors can be detected simultaneously each time.

[0014] Next, the smoke generation unit operates to input smoke into the test chamber.

[0015] Then, each PM2.5 dust sensor real-time collects the PM2.5 smoke concentration value in the test chamber and uploads it to the test computer, and the dust detector real-time collects the PM2.5 smoke concentration value in the test chamber and uploads it to the test computer. By comparing the collected values of the PM2.5 dust sensor and the dust detector, it is judged whether the PM2.5 dust sensor is qualified, and then the product yield of the PM2.5 dust sensor is judged. Since the PM2.5 dust sensor is tested in the test chamber, a stable dust sensor test environment can be provided to improve the detection accuracy; since a large number of PM2.5 dust sensors can be detected simultaneously, the mass production detection requirements of the dust sensor can be met.

[0016] Preferably, it further includes a filtering device, which includes a circulation pipeline, a smoke filtering unit arranged on the circulation pipeline, and a pipeline fan or a pipeline pump arranged on the circulation pipeline. Both ends of the circulation pipeline are communicated with the inner cavity of the test chamber. In this solution, the PM2.5 dust concentration value in the test chamber can be controlled by the filtering device. For example, an example of the dust concentration value control method is as follows: when the PM2.5 dust sensor tests the PM2.5 concentration values of 1500 PPM, 1000 PPM, and 100 PPM smoke values, the smoke generation unit operates to input smoke into the test chamber to raise the PM2.5 concentration value in the test chamber to 1500 PPM. When a concentration value of 1000 PPM is required, the pipeline fan or the pipeline pump is turned on to make the gas in the test chamber circulate through the circulation pipeline, so that the PM2.5 dust is filtered by the smoke filtering unit to reduce the concentration value in the chamber to 1000 PPM. Similarly, a concentration value of 100 PPM or other PM2.5 values can be obtained; thus, the smoke concentration value in the test chamber can be changed to meet the detection requirements of the dust sensor quantity in different pollution environments.

[0017] Preferably, one end of the circulation pipeline is an air outlet end, which is communicated with the top wall of the inner cavity of the test chamber; the other end of the two ends of the circulation pipeline is a return air end, which is communicated with the side wall of the inner cavity of the test chamber; at least one end of the air outlet end and the return air end is provided with a valve. When the filtering device works, the valve is opened, the pipeline fan or the pipeline pump is started to work, the gas in the test chamber enters the circulation pipeline through the air outlet end, and then flows back into the test chamber through the return air end. During this process, the PM2.5 dust is filtered by the smoke filtering unit. Since the air outlet end is communicated with the top wall of the inner cavity of the test chamber, thus, it is beneficial to suck the gas in the test chamber into the circulation pipeline; while the return air end is communicated with the side wall of the inner cavity of the test chamber and is far away from the air outlet end, which is beneficial to the air flow in the test chamber to circulate through the circulation pipeline.

[0018] Preferably, it further includes an air circulation stirring device arranged in the test chamber. In this way, the smoke in the test chamber can be evenly dispersed to each position inside the chamber through the air circulation stirring device, so that the detection environments of each PM2.5 dust sensor are the same, and the detection accuracy is improved.

[0019] Preferably, the air circulation stirring device includes:

[0020] A stirring fan, arranged on the top wall of the test chamber to form a stirring air flow in the up and down direction;

[0021] A circulation fan, arranged on the top wall or the side wall of the test chamber to form a stirring air flow in the left and right and / or front and back directions. In this way, the smoke in the test chamber can be stirred in the up and down direction by the stirring fan, and circulated and stirred in the left and right and / or front and back directions by the circulation fan, so as to ensure that the smoke in the test chamber is evenly dispersed to each position inside the chamber, and the detection environments of each PM2.5 dust sensor are the same.

[0022] Preferably, it further includes:

[0023] A constant temperature and humidity device, which adjusts and controls the temperature and humidity in the test chamber and is electrically connected to the test computer;

[0024] A temperature and humidity sensor, arranged in the test chamber and electrically connected to the test computer. Before the PM2.5 dust sensor detects, according to the detected temperature and humidity requirements, the temperature and humidity in the test chamber can be adjusted and controlled by the constant temperature and humidity device, and detected by the temperature and humidity sensor until the temperature and humidity in the test chamber reach the detection requirements; during the detection process, the temperature and humidity in the test chamber can be kept constant by the constant temperature and humidity device. In this way, not only can the detection of different dust sensors under different temperature and humidity conditions be satisfied; but also the temperature and humidity in the test chamber can be kept constant, thereby further improving the detection accuracy.

[0025] Preferably, the test rack includes one or more layers of planks arranged successively from top to bottom, and a plurality of the above-mentioned sensor interfaces are provided on each layer of plank, and the sensor interfaces on each layer of plank are evenly arranged and distributed. In this way, a plurality of PM2.5 dust sensors can be installed on each layer of the test rack, thereby further increasing the number of detections of the PM2.5 dust sensors to meet the mass production detection requirements of the dust sensors.

[0026] Preferably, the test rack includes a skeleton and rollers provided at the bottom of the skeleton, and the plank is an anti-static plank. The test rack can be moved through the rollers to install the PM2.5 dust sensor in the test cabin; then it is moved to a designated position in the test cabin to shorten the interval time for detecting adjacent batches of PM2.5 dust sensors and further improve the detection efficiency. The plank being an anti-static plank can prevent static electricity from being generated and affecting the detection accuracy of the PM2.5 dust sensor.

[0027] Preferably, the smoke generating unit is a cigarette lighter, and the cigarette lighter is arranged in the test cabin. In this way, it is convenient for the installation and production of the smoke generating unit.

[0028] Preferably, the smoke generating unit includes a smoke generator, a suction pump, and a pipeline connecting the suction pump to the inner cavity of the test cabin, and the suction pump inputs the smoke generated by the smoke generator into the test cabin. In this way, the operator can control the smoke generating unit outside the test cabin, which is convenient for actual operation.

[0029] The beneficial effects of the present utility model are:

[0030] Firstly, it can not only provide a stable test environment for the dust sensor to improve the detection accuracy, but also meet the mass production detection requirements of the dust sensor.

[0031] Secondly, it can change the smoke concentration value in the test cabin, thereby meeting the detection requirements of the dust sensor in different pollution environments during mass production. Description of the Drawings

[0032] Figure 1 is a three-dimensional structure schematic diagram of a PM2.5 dust sensor test device of the present utility model.

[0033] Figure 2 is a side view of a PM2.5 dust sensor test device of the present utility model.

[0034] Figure 3 is a structure schematic diagram of the test rack of a PM2.5 dust sensor test device of the present utility model.

[0035] Figure 4 is a schematic diagram of the hardware system framework of a PM2.5 dust sensor test device of the present utility model.

[0036] Test chamber 1, hatch 1.1;

[0037] Smoke generation unit 2;

[0038] Test computer 3;

[0039] Dust detector 4;

[0040] Air circulation and stirring device 5, stirring fan 5.1, circulation fan 5.2;

[0041] Test stand 6, table board 6.1, sensor interface 6.2;

[0042] Filter device 7, circulation pipeline 7.1, smoke filtering unit 7.2;

[0043] Temperature and humidity sensor 8;

[0044] Control cabinet 9. Detailed implementation mode

[0045] Specific embodiment 1, as Figure 1 、 Figure 2 shown, a PM2.5 dust sensor test device includes a test chamber 1, a smoke generation unit 2, a test computer 3, a dust detector 4, and one or more test stands 6. The test chamber 1 is provided with a hatch 1.1, and there is a sealing structure between the hatch 1.1 and the test chamber 1. When the hatch 1.1 is closed, the hatch 1.1 is sealingly connected to the test chamber 1.

[0046] The smoke generation unit 2 provides smoke inside the test chamber 1.

[0047] The dust detector 4 is electrically connected to the test computer 3. In this embodiment, the dust detector 4 is a TSI dust detector. The dust detector 4 collects the PM2.5 smoke concentration value inside the test chamber 1.

[0048] The test stand 6 includes a data acquisition board and a number of sensor interfaces 6.2 arranged and distributed. The sensor interface 6.2 is used to install the PM2.5 dust sensor. The sensor interface 6.2 is electrically connected to the data acquisition board, and the data acquisition board is electrically connected to the test computer 3.

[0049] The specific operation of the PM2.5 dust sensor test device in this embodiment is as follows,

[0050] Install the PM2.5 dust sensor to be detected on the sensor interface 6.2 (one PM2.5 dust sensor is installed on one sensor interface 6.2) so that the PM2.5 dust sensor is electrically connected to the data acquisition board. During actual testing, according to mass production requirements, one or more test racks 6 can be placed in the test chamber 1, and several PM2.5 dust sensors can be installed on each test rack 6; thus, a large number of PM2.5 dust sensors can be detected simultaneously each time.

[0051] Close the hatch door 1.1.

[0052] Next, the smoke generation unit 2 operates to input smoke into the test chamber 1. During this process, the PM2.5 smoke concentration value in the test chamber 1 is collected in real time by the dust detector 4 until the PM2.5 smoke concentration value in the test chamber 1 reaches the set value required for detection.

[0053] Then, each PM2.5 dust sensor collects the PM2.5 smoke concentration value in the test chamber 1 in real time and uploads it to the test computer 3, and the dust detector 4 collects the PM2.5 smoke concentration value in the test chamber 1 in real time and uploads it to the test computer 3. By comparing the values collected by the PM2.5 dust sensor with those collected by the dust detector 4, it is determined whether the PM2.5 dust sensor is qualified, and further the product yield rate of the PM2.5 dust sensor is judged. Since the PM2.5 dust sensor is tested in the test chamber 1, a stable dust sensor test environment can be provided to improve the detection accuracy; since a large number of PM2.5 dust sensors can be detected simultaneously, the mass production detection requirements of the dust sensor can be met.

[0054] Specific Embodiment 2, as Figure 1 、 Figure 2 、 Figure 3 shown, a PM2.5 dust sensor test device includes a test chamber 1, a smoke generation unit 2, a test computer 3, a dust detector 4, an air circulation stirring device 5, and one or more test racks 6. The test chamber 1 is provided with a hatch door 1.1, and there is a sealing structure between the hatch door 1.1 and the test chamber 1. When the hatch door 1.1 is closed, the hatch door 1.1 is hermetically connected to the test chamber 1.

[0055] The smoke generation unit 2 provides smoke for the test chamber 1. The air circulation stirring device 5 is arranged in the test chamber 1 to circulate and stir the smoke in the test chamber 1 so that the smoke in the test chamber 1 is evenly dispersed to various positions inside the chamber.

[0056] The dust detector 4 is electrically connected to the test computer 3. In this embodiment, the dust detector 4 is a TSI dust detector. The dust detector 4 collects the PM2.5 smoke concentration value in the test chamber 1.

[0057] The test rack 6 includes a data acquisition board and a number of sensor interfaces 6.2 arranged and distributed. The sensor interface 6.2 is used to install a PM2.5 dust sensor. The sensor interface 6.2 is electrically connected to the data acquisition board, and the data acquisition board is electrically connected to the test computer 3.

[0058] The specific operation of a PM2.5 dust sensor test device in this embodiment is as follows.

[0059] Install the PM2.5 dust sensor to be detected on the sensor interface 6.2 (one PM2.5 dust sensor is installed on one sensor interface 6.2) so that the PM2.5 dust sensor is electrically connected to the data acquisition board. During actual testing, according to mass production requirements, one or more test racks 6 can be placed in the test chamber 1, and several PM2.5 dust sensors can be installed on each test rack 6; thus, a large number of PM2.5 dust sensors can be detected simultaneously each time.

[0060] Close the hatch 1.1.

[0061] Next, the smoke generating unit 2 operates to input smoke into the test chamber 1; at the same time, the air circulation and stirring device 5 operates to circulate and stir the smoke in the test chamber 1, evenly dispersing the smoke in the test chamber 1 to various positions inside the chamber, so that the detection environment of each PM2.5 dust sensor is the same, improving the detection accuracy. During this process, the PM2.5 smoke concentration value in the test chamber 1 is continuously collected by the dust detector 4 until the PM2.5 smoke concentration value in the test chamber 1 reaches the set value required for detection.

[0062] Then, each PM2.5 dust sensor continuously collects the PM2.5 smoke concentration value in the test chamber 1 and uploads it to the test computer 3, and the dust detector 4 continuously collects the PM2.5 smoke concentration value in the test chamber 1 and uploads it to the test computer 3. By comparing the values collected by the PM2.5 dust sensor with the values collected by the dust detector 4, it is determined whether the PM2.5 dust sensor is qualified, and thus the product yield rate of the PM2.5 dust sensor is judged. Since the PM2.5 dust sensor is tested in the test chamber 1, a stable dust sensor test environment can be provided to improve the detection accuracy; since a large number of PM2.5 dust sensors can be detected simultaneously, the mass production detection requirements of the dust sensor can be met.

[0063] Specifically, the test chamber 1 uses metal as the frame, the top and bottom walls are steel plates, and the surrounding side walls are made of tempered glass. In this way, the entire test process can be directly observed through the surrounding side walls of the test chamber 1. Of course, it should be noted that the top, bottom, and surrounding side walls of the test chamber 1 can also be made of other transparent or opaque materials.

[0064] As Figure 1 , Figure 2 shown, the air circulation stirring device 5 includes a stirring fan 5.1 and a circulation fan 5.2. The stirring fan 5.1 is arranged on the top wall of the test chamber 1 to form a stirring air flow in the up and down direction; the circulation fan 5.2 is arranged on the top wall or the side wall of the test chamber 1 to form a stirring air flow in the left and right and / or front and back directions. In this way, the smoke in the test chamber 1 can be stirred in the up and down direction by the stirring fan 5.1, and circulated and stirred in the left and right and / or front and back directions by the circulation fan 5.2 to ensure that the smoke in the test chamber 1 is evenly dispersed to each position inside the chamber, so that the detection environments of each PM2.5 dust sensor are the same.

[0065] The TSI dust detector is arranged inside or outside the test chamber 1 as required. In one implementation of this embodiment, the TSI dust detector is arranged inside the test chamber 1, and the TSI dust detector can directly collect the PM2.5 smoke concentration value inside the test chamber 1.

[0066] In another implementation of this embodiment, as Figure 1 , Figure 2 shown, the TSI dust detector is arranged outside the test chamber 1, and the TSI dust detector is communicated with the inner cavity of the test chamber 1 through a collection pipe. There is a suction pump in the TSI dust detector, and the gas inside the test chamber 1 is pumped into the TSI dust detector through the collection pipe by the suction pump to achieve the collection of the PM2.5 smoke concentration value inside the test chamber 1.

[0067] Furthermore, as Figure 1 , Figure 3 shown, the test rack 6 includes one or more layers of planks 6.1 distributed successively from top to bottom. A number of the sensor interfaces 6.2 are arranged on each plank 6.1, and the sensor interfaces 6.2 on each plank 6.1 are evenly arranged and distributed. In this embodiment, the plank 6.1 has two layers, and each plank 6.1 has 150 sensor interfaces 6.2. As Figure 3 shown, six test racks 6 are arranged inside the test chamber 1. 150 PM2.5 dust sensors can be installed on each layer of the plank 6.1 of the test rack 6, and 300 PM2.5 dust sensors can be installed on each test rack 6. In this way, the test chamber 1 can simultaneously detect 1800 PM2.5 dust sensors at a time to meet the mass production detection requirements of the dust sensors.

[0068] Furthermore, as Figure 3As shown, the test stand 6 includes a framework and rollers provided at the bottom of the framework. In this embodiment, the rollers are universal wheels. The test stand 6 can be moved through the rollers to install the PM2.5 dust sensor in the test cabin 1; then it is moved to a designated position inside the test cabin 1 to shorten the interval time between detections of adjacent batches of PM2.5 dust sensors, thereby further improving the detection efficiency.

[0069] The platen 6.1 is an anti-static plate. The platen 6.1 being an anti-static plate can prevent the generation of static electricity, which may affect the detection accuracy of the PM2.5 dust sensor.

[0070] Furthermore, as Figure 1 、 Figure 2 shown, a PM2.5 dust sensor test device further includes a filtering device 7. The filtering device 7 includes a circulation pipeline 7.1, a smoke filtering unit 7.2 provided on the circulation pipeline 7.1, and a pipeline fan or a pipeline pump provided on the circulation pipeline 7.1. The smoke filtering unit 7.2 is used for PM2.5 dust. The smoke filtering unit 7.2 is composed of one or more filter materials. The specific manner and structure of the smoke filtering unit 7.2 are prior art, and its specific structure is not the inventive point of this application. Therefore, this application does not elaborate on the specific manner and structure and other conventional technical means of the smoke filtering unit 7.2. Both ends of the circulation pipeline 7.1 are communicated with the inner cavity of the test cabin 1. Based on this, the PM2.5 dust concentration value inside the test cabin 1 can be controlled through the filtering device 7. For example, as an example of the dust concentration value control method, when the PM2.5 dust sensor tests PM2.5 concentration values of 1500 PPM, 1000 PPM, and 100 PPM smoke values, the smoke generating unit 2 works to input smoke into the test cabin 1 to raise the PM2.5 concentration value inside the test cabin 1 to 1500 PPM, and then the PM2.5 dust sensor is detected; when a concentration value of 1000 PPM is required, the pipeline fan or the pipeline pump is turned on to make the gas inside the test cabin 1 circulate through the circulation pipeline 7.1, thereby filtering PM2.5 dust through the smoke filtering unit 7.2 to reduce the concentration value inside the cabin to 1000 PPM, and then the PM2.5 dust sensor is detected; similarly, a concentration value of 100 PPM or other PM2.5 values are obtained; thus, the smoke concentration value inside the test cabin is changed to meet the detection requirements of the dust sensor under different pollution environments.

[0071] In this embodiment, the circulation pipeline 7.1 is located outside the test chamber 1. One end of the two ends of the circulation pipeline 7.1 is an air outlet end, which is communicated with the top wall of the inner cavity of the test chamber 1. The other end of the two ends of the circulation pipeline 7.1 is a return air end, which is communicated with the side wall of the inner cavity of the test chamber 1. At least one of the air outlet end and the return air end is provided with a valve. In this embodiment, an air outlet valve is provided on the air outlet end, and an intake valve is provided on the return air end. Both the air outlet valve and the intake valve are automatically controlled valves. A pipeline fan or a pipeline pump is located on the circulation pipeline 7.1 between the smoke filtering unit 7.2 and the intake valve. When the filtering device 7 works, the air outlet valve and the intake valve are opened, the pipeline fan or the pipeline pump is started to work, the gas in the test chamber 1 enters the circulation pipeline 7.1 through the air outlet end, and then flows back into the test chamber 1 through the return air end. During this process, the PM2.5 dust is filtered by the smoke filtering unit 7.2. Since the air outlet end is communicated with the top wall of the inner cavity of the test chamber 1, thus, it is beneficial to suck the gas in the test chamber 1 into the circulation pipeline 7.1; while the return air end is communicated with the side wall of the inner cavity of the test chamber 1 and is far away from the air outlet end, so that it is beneficial to the air flow in the test chamber 1 to circulate through the circulation pipeline 7.1. When the filtering device stops working, the air outlet valve and the intake valve are closed.

[0072] In an implementation manner of this embodiment, as Figure 1 , Figure 2 shown, the smoke generating unit 2 includes a smoke generator, a suction pump and a pipeline connecting the suction pump and the inner cavity of the test chamber 1. The suction pump inputs the smoke generated by the smoke generator into the test chamber 1. The smoke generator is a cigarette lighter. The specific operation of the smoke generating unit 2 to provide smoke in the test chamber 1 is as follows. The operator lights a cigarette with the cigarette lighter outside the test chamber 1, and the suction pump inputs the smoke generated by the smoke generator into the test chamber 1 through the pipeline. Thus, the operator can control the smoke generating unit 2 outside the test chamber 1, which is convenient for actual operation.

[0073] In another implementation manner of this embodiment, the smoke generating unit 2 is a cigarette lighter, and the cigarette lighter is arranged in the test chamber 1. The specific operation of the smoke generating unit 2 to provide smoke in the test chamber 1 is as follows. The cigarette lighter lights a cigarette, and the smoke is directly emitted into the test chamber 1. Thus, it is convenient for the installation and manufacture of the smoke generating unit 2.

[0074] Specific Embodiment Three. The rest of the structure of this embodiment refers to Specific Embodiment Two, and the difference is that

[0075] As Figure 1As shown in the figure, a PM2.5 dust sensor testing device further includes a constant temperature and humidity device (not shown in the figure) and a temperature and humidity sensor 8. The temperature and humidity sensor 8 is disposed inside the test chamber 1 for detecting the temperature and humidity inside the test chamber 1. The constant temperature and humidity device adjusts and controls the temperature and humidity inside the test chamber 1. The constant temperature and humidity device is electrically connected to the test computer 3. The temperature and humidity sensor 8 is electrically connected to the test computer 3. The specific manner and structure of the constant temperature and humidity device are prior art, and its specific structure is not the inventive point of this application. Therefore, this application does not elaborate on the conventional technical means such as the specific manner and structure of the constant temperature and humidity device. Based on this, before the PM2.5 dust sensor is detected, the temperature and humidity inside the test chamber 1 can be adjusted and controlled by the constant temperature and humidity device according to the detected temperature and humidity requirements, and detected by the temperature and humidity sensor 8 until the temperature and humidity inside the test chamber 1 reach the detection requirements; during the detection process, the temperature and humidity inside the test chamber 1 can also be kept constant by the constant temperature and humidity device. In this way, not only can the detection of different dust sensors under different temperature and humidity conditions be satisfied; but also the temperature and humidity inside the test chamber 1 can be kept constant, thereby further improving the detection accuracy.

[0076] Specific Embodiment Four. The remaining structure of this embodiment refers to Specific Embodiment Two or Specific Embodiment Three. The difference lies in that

[0077] As Figure 4 shown in the figure, a PM2.5 dust sensor testing device further includes a control cabinet 9 and a digital switch. The control cabinet is internally provided with a switching power supply, a serial server, and a serial relay. The digital switch is electrically connected to the test computer 3. The serial server is electrically connected to the digital switch. The data acquisition board, the serial relay, the constant temperature and humidity device, and the temperature and humidity sensor 8 are respectively electrically connected to the serial server. The stirring fan 5.1, the circulation fan 5.2, the air outlet valve, the air inlet valve, and the filtering device 7 are respectively electrically connected to the serial relay.

[0078] The above are only the preferred embodiments of the present utility model and do not impose any limitation on the present utility model. Any simple modification, change, and equivalent transformation made to the above embodiments according to the technical essence of the present utility model still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A PM2.5 dust sensor testing device, characterized in that: include: A test cabin having a hatch provided thereon; A smoke generating unit for providing smoke inside the test chamber; Testing computers; Dust detector, which collects PM2.5 smoke concentration values ​​in the test chamber and is electrically connected to the test computer; At least one test frame includes a data acquisition board and a plurality of distributed sensor interfaces for installing PM2.5 dust sensors, the sensor interface is electrically connected to the data acquisition board, and the data acquisition board is electrically connected to the test computer.

2. The PM2.5 dust sensor testing device according to claim 1 is characterized in that: It also includes a filtering device, which includes a circulation pipeline, a smoke filtering unit arranged on the circulation pipeline, and a pipeline fan or a pipeline pump arranged on the circulation pipeline. Both ends of the circulation pipeline are connected to the inner cavity of the test cabin.

3. The PM2.5 dust sensor testing device according to claim 2 is characterized in that: One of the two ends of the circulation pipeline is an air outlet end, which is connected to the top wall of the inner cavity of the test chamber; the other end of the circulation pipeline is an air return end, which is connected to the side wall of the inner cavity of the test chamber; at least one of the air outlet end and the air return end is provided with a valve.

4. A PM2.5 dust sensor testing device according to claim 1, 2 or 3, characterized in that: It also includes an air circulation stirring device arranged in the test cabin.

5. The PM2.5 dust sensor testing device according to claim 4 is characterized in that: The air circulation stirring device comprises: A stirring fan is arranged on the top wall of the test chamber to form a stirring airflow in the up and down directions; The circulation fan is arranged on the top wall or the side wall of the test chamber to form a stirring airflow in the left-right and / or front-back directions.

6. A PM2.5 dust sensor testing device according to claim 1, 2 or 3, characterized in that: include: Constant temperature and humidity equipment, which regulates and controls the temperature and humidity in the test chamber and is electrically connected to the test computer; The temperature and humidity sensor is arranged in the test cabin and is electrically connected to the test computer.

7. A PM2.5 dust sensor testing device according to claim 1, 2 or 3, characterized in that: The test stand comprises one or more layers of platforms which are sequentially arranged from top to bottom, each layer of the platforms is provided with a number of the sensor interfaces, and the sensor interfaces on each layer of the platforms are evenly arranged and distributed.

8. The PM2.5 dust sensor testing device according to claim 7 is characterized in that: The test frame comprises a frame and rollers arranged at the bottom of the frame, and the table is an antistatic plate.

9. A PM2.5 dust sensor testing device according to claim 1, 2 or 3, characterized in that: The smoke generating unit is a cigarette lighter, which is arranged in the test cabin.

10. A PM2.5 dust sensor testing device according to claim 1, 2 or 3, characterized in that: The smoke generating unit comprises a smoke generator, a suction pump and a pipe connecting the suction pump and the inner cavity of the test chamber. The suction pump inputs the smoke generated by the smoke generator into the test chamber.

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