A test platform and test method for flammable refrigerant sensors

Abstract

The application discloses a kind of flammable refrigerant sensor test platform and test method, including oil tank, refrigerant tank, sensitive gas tank, toxic gas tank, first tank body, second tank body, third tank body, fourth tank body and integrated control cabinet, wherein: the first tank body is provided with first tank body import, first tank body fan, first tank body air vent and stainless steel grid;The second tank body is provided with sensitive gas or toxic gas import, second tank body gas inlet, second tank body fan and second tank body pressure control module;The third tank body is provided with third tank body gas inlet, third tank body fan and third tank body temperature and humidity control module;The fourth tank body is explosion-proof tank, is provided with fourth tank body gas inlet, fourth tank body fan and fourth tank body pressure control module;The application can meet the multiple test requirements of sensor, and allow multiple tests to be carried out simultaneously, improve test efficiency.

Description

Technical Field

[0001] This invention relates to the field of electrical safety testing, and in particular to a testing platform and testing method for a flammable refrigerant sensor. Background Technology

[0002] Currently, the testing equipment for flammable refrigerant sensors used in household appliances in the industry is mainly based on the test chambers built according to the reliability testing requirements for flammable refrigerant sensors in the electrical safety standards IEC 60335-2-40:2022 "Safety of household and similar electrical appliances, heat pumps, air conditioners and dehumidifiers" and UL 60335-2-40:2022 "Safety of household and similar electrical appliances, heat pumps, air conditioners and dehumidifiers".

[0003] However, in actual testing, due to the numerous tests and procedures, and the high precision requirements for gas mixing, many operational problems arise. For example, the standard does not provide guidance on the methods for configuring specific concentrations of toxic gases, refrigerants, or refrigerant-oil mixtures, nor does it offer guidance on how to achieve different testing environments. This results in equipment designed based on the standard often failing to maintain stable testing accuracy and time efficiency, ultimately leading to low overall testing efficiency.

[0004] Existing testing devices, such as the "Method and Apparatus for Testing the Reliability of a Flammable Refrigerant Sensor" disclosed in patent application CN117368409A, are mainly derived from the requirements of Annex LL of the international electrical safety standard IEC 60335-2-40. These devices can test calibration and short-term stability, sensitive gases, resistance to gas contamination, temperature and humidity, and vibration. However, they cannot be used for the sensor ignition risk test required by the standard. Furthermore, Annex LL of UL 60335-2-40 adds pressure conditions to the test environment. This standard requires that the sensor be located in a test chamber capable of controlling temperature, humidity, and ambient pressure, and capable of delivering a specific concentration of refrigerant into the chamber, allowing the test sample (sensor) to respond to the gas. During specific tests, the chamber needs to be able to be evacuated, or a refrigerant-oil mixture needs to be sprayed at a certain rate to deliver a specific concentration of toxic gas into the chamber, and it must possess explosion-proof characteristics (for testing the sensor ignition risk).

[0005] Existing testing equipment cannot be used to prepare specific concentrations of toxic gases, refrigerants, or refrigerant-oil mixtures for testing. The detection device described in CN117368409A has a gas inlet for adding sensitive gases into the detection container, but it does not address how to ensure the required concentration of the test gas. In actual testing, the concentration of the added gas must be precisely controlled according to standards. If the test gas is prepared manually, for example, by determining the mass of each component of the input mixture using a quantitative method, and then taking it from the corresponding gas / liquid container and mixing it, this process cannot guarantee constant pressure and sealing, making it difficult to ensure the accuracy of the added gas concentration. Furthermore, the tests required by the standard vary depending on environmental conditions, while the detection device described in CN117368409A is designed with a single test chamber for calibration and multiple tests including short-term stability, temperature detection, humidity detection, and oil contamination detection. Different tests have different requirements for the tank material. For example, for sensitive gas and gas contamination resistance tests, the tank material needs to be resistant to corrosion from multiple gases; however, for sensor ignition risk tests, the tank material must guarantee explosion-proof characteristics, without needing to consider gas corrosion resistance. This type of testing method places very stringent requirements on the test tank. Summary of the Invention

[0006] One of the objectives of this invention is to provide a test platform for flammable refrigerant sensors that meets all the test requirements of IEC60335-2-40 and UL 60335-2-40 Annex LL, and allows multiple tests to be performed simultaneously, thereby improving test efficiency.

[0007] A test platform for a flammable refrigerant sensor includes an oil tank, a refrigerant tank, a sensitive gas tank, and a toxic gas tank, and also includes a first tank body, a second tank body, a third tank body, a fourth tank body, and an integrated control cabinet, wherein:

[0008] The first tank is provided with a first tank inlet, a first tank fan for mixing the gas in the first tank, a first tank vent for allowing outside air to enter the first tank, and a stainless steel mesh as required by the test standard. The first tank inlet is connected to the outlet of an oil and refrigerant mixing device. One inlet of the oil and refrigerant mixing device is connected to the oil tank through a pipeline equipped with a metering oil inlet device, and the other inlet of the oil and refrigerant mixing device is connected to the refrigerant tank through a pipeline equipped with a first refrigerant flow control device.

[0009] The second tank is provided with a sensitive gas or toxic gas inlet for the entry of sensitive gas or toxic gas, a second tank inlet, a second tank fan for mixing the gas in the second tank, and a second tank pressure control module for controlling the internal pressure of the second tank. The sensitive gas or toxic gas inlet is connected to the sensitive gas tank or the toxic gas tank through a pipeline equipped with a toxic gas flow control device. The second tank inlet is connected to the refrigerant tank through a pipeline equipped with a second refrigerant flow control device.

[0010] The third tank is provided with a third tank air inlet, a third tank fan for mixing the gas in the third tank, and a third tank temperature and humidity control module for controlling the temperature and humidity inside the third tank. The third tank air inlet is connected to the refrigerant tank through a pipeline equipped with a third refrigerant flow control device.

[0011] The fourth tank is an explosion-proof tank, equipped with a fourth tank air inlet, a fourth tank fan for mixing the gas in the fourth tank, and a fourth tank pressure control module for controlling the internal pressure of the fourth tank. The fourth tank air inlet is connected to the outlet of a high-pressure refrigerant preparation device, and the inlet of the high-pressure refrigerant preparation device is connected to the refrigerant tank through a pipeline equipped with a fourth refrigerant flow control device.

[0012] The integrated control cabinet is equipped with a controller and a control panel. The controller is connected to the second tank pressure control module, the third tank temperature and humidity control module, the fourth tank pressure control module, the metering oil inlet device, the first refrigerant flow control device, the toxic gas flow control device, the second refrigerant flow control device, the third refrigerant flow control device, and the fourth refrigerant flow control device. The control panel is used to set test parameters and send them to the controller.

[0013] The controller of this invention can be programmed to perform the following functions according to the test requirements of the appendices of IEC 60335-2-40 and UL 60335-2-40: It calculates and sets the required refrigerant dosage for each tank test, the required refrigerant dosage and oil quantity for oil spraying test, and the amount of sensitive or toxic gas based on the alarm threshold of the sensor sample under test. Then, it controls the quantitative oil inlet device, the first refrigerant flow control device, the toxic gas flow control device, the second refrigerant flow control device, the third refrigerant flow control device, and the fourth refrigerant flow control device to add the gas of the required concentration according to the test standard to each tank. The oil and refrigerant mixing device can fully mix the oil and refrigerant before spraying it into the first tank through the first tank inlet. The high-pressure refrigerant preparation device can compress the refrigerant to a set pressure and deliver it to the fourth tank. A fan in each tank mixes the gas evenly, improving the overall test accuracy. The four tanks can simultaneously perform different tests on multiple sensor samples, improving testing efficiency.

[0014] The present invention also has the following preferred designs:

[0015] The second tank pressure control module and the fourth tank pressure control module of the present invention both include a vacuum pump, a booster pump and a pressure sensor. The vacuum pump evacuates the tank to reduce the pressure, the booster pump inflates the tank to increase the pressure, and the pressure sensor monitors the internal pressure of the tank. After the sensor sample is placed in the corresponding tank, the pressure environment of the corresponding tank is adjusted.

[0016] The second tank of the present invention is also connected to an exhaust gas treatment module for treating sensitive gases, toxic gases, and residual refrigerant.

[0017] As one possible implementation, the exhaust gas treatment module includes a fume hood and a filter.

[0018] The integrated control cabinet of the present invention is equipped with a quantitative oil inlet device capable of quantitative oil or gas inlet, a first refrigerant flow control device, a toxic gas flow control device, a second refrigerant flow control device, a third refrigerant flow control device, and a fourth refrigerant flow control device.

[0019] The second, third, and fourth tanks of the present invention are all equipped with a refrigerant detection device for detecting the refrigerant concentration inside each tank.

[0020] A second objective of this invention is to provide a testing method for a testing platform employing the aforementioned combustible refrigerant sensor, comprising the following steps:

[0021] S1. According to the test requirements, select the corresponding oil, refrigerant, sensitive gas and toxic gas and store them in the oil tank, refrigerant tank, sensitive gas tank and toxic gas tank respectively;

[0022] S2. Set the test parameters through the control panel of the integrated control cabinet, including the pressure conditions of the second tank, the temperature and humidity conditions of the third tank, and the pressure conditions of the fourth tank;

[0023] S3. Place the sensor to be tested into the first tank, the second tank, the third tank, and the fourth tank respectively;

[0024] S4. Start the test via the controller in the integrated control cabinet;

[0025] The sensors are tested for calibration, short-term stability, long-term stability, response time, fuel injection, vibration, and electromagnetic compatibility according to IEC 60335-2-40LL.3, LL.4, LL.6, ​​LL.7 and UL 60335-2-40LL.3, LL.4, LL.6, ​​LL.7, LL11.3, LL.12 in the first tank. Sensitive gas testing and pressure environment testing are conducted for the sensors according to IEC 60335-2-40LL.5 and UL 60335-2-40LL.5, LL.10 in the second tank. High and low temperature and humidity condition testing are conducted for the sensors according to IEC 60335-2-40 and UL 60335-2-40LL.8, LL.9 in the third tank. The ignition risk testing for the sensors according to IEC 60335-2-40LL.11 and UL 60335-2-40LL.13 is conducted in the fourth tank.

[0026] This invention reduces the stringency of requirements for test tank materials, as different test items have different material requirements. For example, for sensitive gas and gas contamination resistance tests, the tank material must be resistant to corrosion from multiple gases. However, for sensor ignition risk tests, the tank material must guarantee explosion-proof properties, without needing to consider gas corrosion resistance. This invention, by using four tanks, can meet all test requirements of IEC 60335-2-40 and UL 60335-2-40 Annex LL, and allows multiple tests to be performed simultaneously, improving testing efficiency. Furthermore, this invention reduces the proportion of manual operation during testing, ensuring test accuracy.

[0027] After the test is completed, the waste gas and residual refrigerant of this invention need to be treated.

[0028] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0029] 1. By setting up four tanks, this invention can meet all the test requirements of IEC 60335-2-40 and UL 60335-2-40 Annex LL, and allows multiple tests to be performed simultaneously, thus improving test efficiency.

[0030] 2. Because the present invention sets up four tanks, each used for different test items, the stringency of the requirements for the test tank materials is reduced, and the cost of the tanks is reduced.

[0031] 3. This invention introduces the required gas concentration according to the test standard into each tank through a quantitative oil inlet device, a first refrigerant flow control device, a toxic gas flow control device, a second refrigerant flow control device, a third refrigerant flow control device, and a fourth refrigerant flow control device. This allows for rapid and accurate configuration of the gas concentration according to the test standard. The oil and refrigerant mixing device thoroughly mixes the oil and refrigerant before spraying them into the first tank through the inlet. The high-pressure refrigerant preparation device compresses the refrigerant to the set pressure and then delivers it to the fourth tank. Fans in each tank mix the gas evenly, thus improving the overall accuracy of the test. Attached Figure Description

[0032] Figure 1 A schematic diagram illustrating the working principle of a test platform for a flammable refrigerant sensor provided by the present invention;

[0033] Figure 2 This is a schematic diagram of the first tank in the embodiment;

[0034] Figure 3 This is a schematic diagram of the second tank in the embodiment;

[0035] Figure 4 This is a schematic diagram of the third tank in the embodiment;

[0036] Figure 5 This is a schematic diagram of the fourth tank in the embodiment.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1-First tank; 11-First tank inlet; 12-First tank fan; 13-First tank vent; 14-Stainless steel mesh; 2-Second tank; 21-Second tank air inlet; 22-Sensitive or toxic gas inlet; 23-Second tank fan; 24-Second tank pressure control module; 3-Third tank; 31-Third tank air inlet; 32-Third tank fan; 33-Third tank temperature and humidity control module; 4-Fourth tank; 41-Fourth tank air inlet; 42-Fourth tank fan; 43-Fourth tank pressure control module; 5-Integrated control cabinet; 51-Oil and refrigerant mixing device; 52-Quantitative oil inlet device; 53-First refrigerant flow control device; 54-Toxic gas flow control device; 55-Second refrigerant flow control device; 56-Third refrigerant flow control device; 57-High-pressure refrigerant preparation device; 58-Fourth refrigerant flow control device; 6-Oil tank; 7-Refrigerant tank; 8-Storage box; 9-Waste gas treatment module. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the present invention more apparent, exemplary embodiments according to the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are merely a part of the embodiments of the present invention, and not all of the embodiments of the present invention. It should be understood that the present invention is not limited to the exemplary embodiments described herein. Based on the embodiments of the present invention described herein, all other embodiments obtained by those skilled in the art without inventive effort should fall within the protection scope of the present invention.

[0040] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid obscuring the invention.

[0041] It should be understood that the invention can be embodied in various forms and should not be construed as being limited to the embodiments set forth herein. Rather, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0042] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. When used herein, the singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising” and / or “including,” when used in this specification, identify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0043] To fully understand this invention, a detailed structure will be presented in the following description to illustrate the technical solution proposed by this invention. Optional embodiments of the invention are described in detail below; however, in addition to these detailed descriptions, the invention may have other embodiments.

[0044] like Figures 1 to 5 As shown, a test platform for a flammable refrigerant sensor includes an oil tank 6, a refrigerant tank 7, a storage box 8 for placing sensitive gas or toxic gas canisters, and also includes a first tank body 1, a second tank body 2, a third tank body 3, a fourth tank body 4, and an integrated control cabinet 5. The first tank body 1 is provided with a first tank body inlet 11, a first tank body fan 12 for mixing the gas in the first tank body 1, a first tank body vent 13 for allowing external air to enter the first tank body 1, and a stainless steel mesh 14 as required by the test standard. The first tank body inlet 11 is connected to the outlet of an oil and refrigerant mixing device 51. One inlet of the oil and refrigerant mixing device 51 is connected to the oil tank 6 through a pipeline equipped with a metering oil inlet device 52, and the other inlet of the oil and refrigerant mixing device 51 is connected to the refrigerant tank 7 through a pipeline equipped with a first refrigerant flow control device 53.

[0045] The second tank 2 is provided with a second tank inlet 21, a sensitive gas or toxic gas inlet 22 for the entry of sensitive gas or toxic gas, a second tank fan 23 for mixing the gas in the second tank 2, and a second tank pressure control module 24 for controlling the internal pressure of the second tank 2. The sensitive gas or toxic gas inlet 22 is connected to the sensitive gas tank or the toxic gas tank through a pipeline equipped with a toxic gas flow control device 54. The second tank inlet 21 is connected to the refrigerant tank 7 through a pipeline equipped with a second refrigerant flow control device 55.

[0046] The third tank 3 is provided with a third tank air inlet 31, a third tank fan 32 for mixing the gas in the third tank 3, and a third tank temperature and humidity control module 33 for controlling the internal temperature and humidity of the third tank 3. The third tank air inlet 31 is connected to the refrigerant tank 7 through a pipeline equipped with a third refrigerant flow control device 56.

[0047] The fourth tank 4 is an explosion-proof tank, equipped with a fourth tank air inlet 41, a fourth tank fan 42 for mixing the gas in the fourth tank 4, and a fourth tank pressure control module 43 for controlling the internal pressure of the fourth tank 4. The fourth tank air inlet 41 is connected to the outlet of a high-pressure refrigerant preparation device 57, and the inlet of the high-pressure refrigerant preparation device 57 is connected to the refrigerant tank 7 through a pipeline equipped with a fourth refrigerant flow control device 58.

[0048] The integrated control cabinet 5 is equipped with a controller and a control panel. The controller is connected to the second tank pressure control module 24, the third tank temperature and humidity control module 33, the fourth tank pressure control module 43, the quantitative oil inlet device 52, the first refrigerant flow control device 53, the toxic gas flow control device 54, the second refrigerant flow control device 55, the third refrigerant flow control device 56, and the fourth refrigerant flow control device 58. The control panel is used to set test parameters and send them to the controller. The programmable controller can intelligently adjust the internal pressure of the second tank 2 and the fourth tank 4, as well as the internal temperature and humidity of the third tank 3.

[0049] The controller of this invention can be programmed to perform the following functions according to the test requirements of the appendices of IEC 60335-2-40 and UL 60335-2-40: It calculates and sets the required refrigerant dosage for each tank test, the required refrigerant dosage and oil quantity for oil spraying test, and the amount of sensitive or toxic gas based on the alarm threshold of the sensor sample under test. Then, it controls the quantitative oil inlet device 52, the first refrigerant flow control device 53, the toxic gas flow control device 54, the second refrigerant flow control device 55, the third refrigerant flow control device 56, and the fourth refrigerant flow control device 58 to add the gas of the required concentration according to the test standard to each tank. The oil and refrigerant mixing device 51 can fully mix the oil and refrigerant before spraying it into the first tank 1 through the first tank inlet 11. The high-pressure refrigerant preparation device 57 can compress the refrigerant to the set pressure and deliver it to the fourth tank 4. A fan in each tank mixes the gas evenly, improving the overall test accuracy. The four tanks can simultaneously perform different tests on multiple sensor samples, improving test efficiency.

[0050] In one embodiment, both the second tank pressure control module 24 and the fourth tank pressure control module 33 include a vacuum pump, a booster pump, and a pressure sensor. The vacuum pump evacuates the tank to reduce pressure, the booster pump inflates the tank to increase pressure, and the pressure sensor monitors the internal pressure of the tank, thus adjusting the pressure environment of the corresponding tank before testing.

[0051] In one embodiment, the second tank 2 is further connected to an exhaust gas treatment module 9 for treating sensitive gases, toxic gases, and residual refrigerant. The exhaust gas treatment module 9 includes a fume hood and a filter for treating residual refrigerant in the exhaust gas.

[0052] In one embodiment, the integrated control cabinet 5 is equipped with a quantitative oil inlet device 52, a first refrigerant flow control device 53, a toxic gas flow control device 54, a second refrigerant flow control device 55, a third refrigerant flow control device 56, and a fourth refrigerant flow control device 58 capable of quantitative oil or gas inlet. The quantitative oil or gas inlet or flow control device can be implemented by using electromagnetic valves or electronic scales.

[0053] In one embodiment, the third tank temperature and humidity control module 33 of the third tank 3 can be implemented by combining functional modules such as temperature and humidity sensor, electric heating, refrigeration and dehumidification system, and humidifier.

[0054] In one embodiment, the oil and refrigerant mixing device 51 can be implemented by combining a mixing container, a stirring device, a flow regulating device, etc.

[0055] In one embodiment, the high-pressure refrigerant preparation device 58 can be implemented by combining modules such as a container, a vacuum pump, a booster pump, and a pressure sensor.

[0056] The metered oil inlet, metered air inlet, temperature and humidity control module, oil and refrigerant mixing device, and high-pressure refrigerant preparation device can all be implemented using other methods in the existing technology, which will not be elaborated here.

[0057] In one embodiment, the second tank 2, the third tank 3, and the fourth tank 4 are all equipped with refrigerant detection devices for detecting the refrigerant concentration inside each tank. During testing, the refrigerant concentration in each tank is controlled by quantitative gas and oil injection. A common method is to inject a specific ratio of oil, a sensitive gas, and refrigerant into the tank based on its volume. The refrigerant is then thoroughly stirred and diluted within the tank to achieve the desired concentration. However, due to various factors, the refrigerant concentration obtained using this method alone may contain errors and cannot be directly monitored for changes in the refrigerant concentration. Therefore, refrigerant detection devices are installed in the respective tanks to verify whether the refrigerant concentration meets the requirements. These devices can consist of a refrigerant concentration detector and a corresponding gas concentration sensor, as used in existing technologies.

[0058] A test method for a test platform using the above-mentioned combustible refrigerant sensor includes the following steps:

[0059] S1. Based on the testing requirements, select the corresponding oil, refrigerant, sensitive gas and toxic gas and store them in oil tank 6, refrigerant tank 7, sensitive gas tank and toxic gas tank respectively;

[0060] S2. Set the test parameters through the control panel of the integrated control cabinet 5, including the pressure conditions of the second tank 2, the temperature and humidity conditions of the third tank 3, and the pressure conditions of the fourth tank 4.

[0061] S3. Place the sensor to be tested into the first tank 1, the second tank 2, the third tank 3, and the fourth tank 4 respectively;

[0062] S4. Start the test via the controller in integrated control cabinet 5;

[0063] The sensors in IEC 60335-2-40LL.3, LL.4, LL.6, ​​LL.7 and UL 60335-2-40LL.3, LL.4, LL.6, ​​LL.7, LL11.3, LL.12 are tested for calibration, short-term stability, long-term stability, response time, fuel injection, vibration, and electromagnetic compatibility. The sensors in IEC 60335-2-40LL.5 and UL 60335-2-40LL.5, LL.10 are tested for sensitive gases and pressure environments. The sensors in IEC 60335-2-40 and UL 60335-2-40LL.8, LL.9 are tested for high and low temperature and humidity conditions. The sensors in IEC 60335-2-40 and UL 60335-2-40LL.13 are tested for ignition risk. The sensors in IEC 60335-2-40LL.11 and UL 60335-2-40LL.13 are tested in the fourth tank.

[0064] This invention reduces the stringency of requirements for test tank materials, as different test items have different material requirements. For example, for sensitive gas and gas contamination resistance tests, the tank material must be resistant to corrosion from multiple gases. However, for sensor ignition risk tests, the tank material must guarantee explosion-proof properties, without needing to consider gas corrosion resistance. This invention, by using four tanks, can meet all test requirements of IEC 60335-2-40 and UL 60335-2-40 Annex LL, and allows multiple tests to be performed simultaneously, improving testing efficiency. Furthermore, this invention reduces the proportion of manual operation during testing, ensuring test accuracy.

[0065] After the test is completed, the waste gas and residual refrigerant of this invention need to be treated.

[0066] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A test platform for a flammable refrigerant sensor, comprising an oil tank, a refrigerant tank, a sensitive gas tank, and a toxic gas tank, characterized in that, It also includes a first tank, a second tank, a third tank, a fourth tank, and an integrated control cabinet, wherein: The first tank is provided with a first tank inlet, a first tank fan for mixing the gas in the first tank, a first tank vent for allowing outside air to enter the first tank, and a stainless steel mesh as required by the test standard. The first tank inlet is connected to the outlet of an oil and refrigerant mixing device. One inlet of the oil and refrigerant mixing device is connected to the oil tank through a pipeline equipped with a metering oil inlet device, and the other inlet of the oil and refrigerant mixing device is connected to the refrigerant tank through a pipeline equipped with a first refrigerant flow control device. The second tank is provided with a second tank inlet, a sensitive gas or toxic gas inlet for the entry of sensitive gas or toxic gas, a second tank fan for mixing the gas in the second tank, and a second tank pressure control module for controlling the internal pressure of the second tank. The sensitive gas or toxic gas inlet is connected to the sensitive gas tank or the toxic gas tank through a pipeline equipped with a toxic gas flow control device. The second tank inlet is connected to the refrigerant tank through a pipeline equipped with a second refrigerant flow control device. The third tank is provided with a third tank air inlet, a third tank fan for mixing the gas in the third tank, and a third tank temperature and humidity control module for controlling the temperature and humidity inside the third tank. The third tank air inlet is connected to the refrigerant tank through a pipeline equipped with a third refrigerant flow control device. The fourth tank is an explosion-proof tank, equipped with a fourth tank air inlet, a fourth tank fan for mixing the gas in the fourth tank, and a fourth tank pressure control module for controlling the internal pressure of the fourth tank. The fourth tank air inlet is connected to the outlet of a high-pressure refrigerant preparation device, and the inlet of the high-pressure refrigerant preparation device is connected to the refrigerant tank through a pipeline equipped with a fourth refrigerant flow control device. The integrated control cabinet is equipped with a controller and a control panel. The controller is connected to the second tank pressure control module, the third tank temperature and humidity control module, the fourth tank pressure control module, the metering oil inlet device, the first refrigerant flow control device, the toxic gas flow control device, the second refrigerant flow control device, the third refrigerant flow control device, and the fourth refrigerant flow control device. The control panel is used to set test parameters and send them to the controller.

2. The test platform for the combustible refrigerant sensor according to claim 1, characterized in that: Both the second tank pressure control module and the fourth tank pressure control module include a vacuum pump, a booster pump, and a pressure sensor.

3. The test platform for the combustible refrigerant sensor according to claim 1, characterized in that: The second tank is also connected to an exhaust gas treatment module.

4. The test platform for the combustible refrigerant sensor according to claim 3, characterized in that: The exhaust gas treatment module includes a fume hood and a filter.

5. The test platform for the combustible refrigerant sensor according to claim 1, characterized in that: The integrated control cabinet is equipped with a quantitative oil inlet device, a first refrigerant flow control device, a toxic gas flow control device, a second refrigerant flow control device, a third refrigerant flow control device, and a fourth refrigerant flow control device.

6. The test platform for the combustible refrigerant sensor according to claim 1, characterized in that: The second, third, and fourth tanks are all equipped with refrigerant detection devices for detecting the refrigerant concentration inside each tank.

7. A test method using a test platform employing a flammable refrigerant sensor as described in any one of claims 1 to 6, characterized in that, Including the following steps: S1. According to the test requirements, select the corresponding oil, refrigerant, sensitive gas and toxic gas and store them in the oil tank, refrigerant tank, sensitive gas tank and toxic gas tank respectively; S2. Set the test parameters through the control panel of the integrated control cabinet, including the pressure conditions of the second tank, the temperature and humidity conditions of the third tank, and the pressure conditions of the fourth tank; S3. Place the sensor to be tested into the first tank, the second tank, the third tank, and the fourth tank respectively; S4. Start the test via the controller in the integrated control cabinet; The sensors are tested for calibration, short-term stability, long-term stability, response time, fuel injection, vibration, and electromagnetic compatibility according to IEC 60335-2-40LL.3, LL.4, LL.6, ​​LL.7 and UL 60335-2-40LL.3, LL.4, LL.6, ​​LL.7, LL11.3, LL.12 in the first tank. Sensitive gas testing and pressure environment testing are conducted for the sensors according to IEC 60335-2-40LL.5 and UL 60335-2-40LL.5, LL.10 in the second tank. High and low temperature and humidity condition testing are conducted for the sensors according to IEC 60335-2-40 and UL 60335-2-40LL.8, LL.9 in the third tank. The ignition risk testing for the sensors according to IEC 60335-2-40LL.11 and UL 60335-2-40LL.13 is conducted in the fourth tank.

8. The test method according to claim 7, characterized in that: After the test is completed, the exhaust gas and residual refrigerant are treated.

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