Special equipment for testing ignition temperature of A2L hot surface

Abstract

The utility model discloses an A2L hot surface ignition temperature test special device, which comprises a test box and a spraying type pipe arranged in the test box, the surface of one end of the spraying type pipe is fixedly connected with a refrigerant tank with a valve, one side of the refrigerant tank is provided with the valve which is communicated with the interior of the refrigerant tank through the spraying type pipe, and the other side of the refrigerant tank is provided with the spraying type pipe. A glass barrel is arranged on the peripheral side, close to one end, of the spraying type pipe, a metal disc is fixedly installed on the surface of the lower end of the glass barrel, a thermocouple is fixedly installed on the surface of one side of the metal disc, a heat insulation pad is fixedly connected to the peripheral side surface of the metal disc, and one side, extending to the heat insulation pad, of one end of the metal disc is fixedly connected with a heating plate; according to the utility model, through the arrangement of the spraying type pipe, stable conveying and controlled release of the refrigerant can be realized, the refrigerant can be accurately sprayed on the metal disc, and the refrigerant is fully contacted with the hot surface, so that the ignition temperature of the hot surface is tested, and the effect of accurate test result is achieved.

Description

Technical Field

[0001] This utility model relates to the technical field of special equipment for testing the ignition temperature of A2L hot surfaces, and in particular to special equipment for testing the ignition temperature of A2L hot surfaces. Background Technology

[0002] The A2L hot surface ignition temperature testing equipment is a specialized testing device designed for A2L-class flammable refrigerants. It is used to accurately determine the ignition temperature of this type of flammable and explosive refrigerant on a hot surface to meet the safety testing requirements of explosion-proof design for refrigeration equipment.

[0003] As the global refrigeration industry continues to grow, traditional refrigerants, represented by CFCs and HFCs, have exposed significant environmental risks—their ozone depletion potential (ODP ≥ 0.05) and global warming potential (GWP > 2000) have already caused irreversible damage to the atmosphere. According to the Kigali Amendment to the Montreal Protocol, hydrocarbon refrigerants with zero ODP and low GWP (< 10) (such as R290 and R32) have become the industry's alternative. However, these refrigerants share a common weakness—flammability and explosiveness. This imposes stringent explosion-proof design requirements on refrigeration equipment, and there is a lack of equipment on the market specifically designed for testing the hot surface ignition temperature of A2L flammable refrigerants.

[0004] Therefore, we provide a dedicated device for testing the ignition temperature of A2L hot surfaces. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned technical problems by providing a dedicated device for testing the ignition temperature of the A2L hot surface, thereby ensuring both safety during the testing process and accuracy of the test results.

[0006] In view of this, the present invention provides a special device for testing the ignition temperature of A2L hot surface, including a test chamber and a spray tube built into the test chamber, wherein a refrigerant tank with a valve is fixedly connected to one end of the spray tube.

[0007] A valve is provided on one side of the refrigerant tank, which is connected to the interior of the tank through the spray pipe;

[0008] A glass cylinder is provided near one end of the spray pipe, and a metal plate is fixedly installed on the lower surface of the glass cylinder. A thermocouple is fixedly installed on one side of the metal plate.

[0009] A heat insulation pad is fixedly connected to the peripheral surface of the metal disk, and a heating plate is fixedly connected to one side of the heat insulation pad at one end of the metal disk. The surface of the heat insulation pad near one side is fixedly connected to the heating plate.

[0010] Preferably, the distance between the valve and the valve on the refrigerant tank is sufficient to retain a liquid volume of 1.0 m³ ± 0.2 m³.

[0011] Preferably, the length of the spray pipe is 250mm ± 5.0mm, the outer diameter of the spray pipe is ≤ 4mm, and the inner diameter of the spray pipe is 1.6mm ± 0.1mm.

[0012] Preferably, the glass cylinder has a length of 230mm ± 10mm and an inner diameter of 70mm ± 10mm.

[0013] Preferably, the diameter of the metal disk is 50mm±2.0mm, the thickness of the metal disk is 6±2.0mm, and the surface texture of the metal disk is ISO1302.

[0014] Preferably, the insulation pad has a thickness of 6 mm.

[0015] Preferably, an observation window is fixedly installed on one side surface of the test chamber, and an exhaust port is fixedly installed on the upper side surface of the test chamber.

[0016] Compared with the prior art, this utility model provides a dedicated device for testing the ignition temperature of A2L hot surfaces, which has the following beneficial effects:

[0017] This invention, by setting up a test chamber, provides a relatively stable and controllable environment for the entire test, confining the test to a specific space. This facilitates precise setting and adjustment of environmental conditions such as temperature, humidity, and airflow, while effectively avoiding interference from external environmental factors on the test results, ensuring the accuracy and reliability of the test. Its internal air circulation system ensures uniform air distribution within the chamber, guaranteeing the consistency of the test environment and helping to more accurately simulate actual working conditions, thereby achieving both safety in the testing process and accuracy in the test results.

[0018] This invention utilizes a refrigerant tank 1 equipped with a valve for storing refrigerant. The valve design facilitates control over the amount and timing of refrigerant release, enabling precise release of a specific amount of refrigerant according to testing requirements. This satisfies the quantitative requirements of the test and achieves accurate test results.

[0019] This invention, by setting up a glass cylinder 4, allows for easy observation of the refrigerant's reaction on the metal disc through its transparent glass material, such as whether ignition (flame) occurs. This provides an intuitive basis for recording and analyzing test data. At the same time, its structure can protect the test process to a certain extent, preventing the diffusion of refrigerant and the influence of external factors on the test, thereby achieving the effects of test process safety and test result accuracy.

[0020] This invention features an insulating pad made of ceramic fiber, which allows it to withstand high temperatures while also possessing excellent heat insulation properties. This effectively prevents heat loss from the heating plate and metal disc to the surrounding environment, reducing heat loss and improving heating efficiency. At the same time, it protects surrounding components from the effects of high temperatures, thereby achieving both safety during the testing process and accuracy in the test results.

[0021] 1. This utility model, by setting up a spray pipe, can achieve stable delivery and controlled release of refrigerant, and can accurately spray the refrigerant onto the metal plate, so that the refrigerant can fully contact the hot surface, thereby conducting the test of the hot surface ignition temperature, achieving the effect of accurate test results.

[0022] 2. This utility model, by setting a metal disc, enables it to evenly conduct the heat of the heating plate, so that the refrigerant is heated evenly on its surface, thereby achieving the effect of accurate test results.

[0023] 3. This utility model, by setting an observation window and an exhaust port, allows for safe observation of the testing process, thereby achieving the effect of test process safety. At the same time, the exhaust port can quickly discharge the residual waste gas inside the test chamber, preparing for the next test, thereby improving the efficiency of the test.

[0024] The parts of this device not covered herein are the same as or can be implemented using existing technologies. This utility model has a simple structure and is easy to operate. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the special device for testing the ignition temperature of the A2L hot surface proposed in this utility model;

[0026] Figure 2 This is a top view of the metal disk structure of the A2L hot surface ignition temperature testing device proposed in this utility model;

[0027] Figure 3 This is a side view of the metal disk structure of the A2L hot surface ignition temperature testing device proposed in this utility model;

[0028] Figure 4 This is a bottom view of the test chamber structure of the special equipment for testing the ignition temperature of the A2L hot surface proposed in this utility model;

[0029] Figure 5 This is a top view of the test chamber structure of the special equipment for testing the ignition temperature of the A2L hot surface proposed in this utility model;

[0030] Figure 6 This is a front view structural diagram of the test chamber of the special equipment for testing the ignition temperature of the A2L hot surface proposed in this utility model;

[0031] Figure 7 This is a side view of the test chamber structure of the A2L hot surface ignition temperature testing equipment proposed in this utility model.

[0032] In the diagram: 1. Refrigerant tank; 2. Valve; 3. Spray pipe; 4. Glass cylinder; 5. Metal disc; 6. Thermocouple; 7. Insulation pad; 8. Heating plate; 10. Test chamber; 11. Observation window; 12. Exhaust port. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0034] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] Example: A2L hot surface ignition temperature testing equipment, such as... Figures 1-7 As shown, it includes a test chamber 10 and a spray pipe 3 built into the test chamber 10. A refrigerant tank 1 with a valve is fixedly connected to one end of the spray pipe 3.

[0036] A valve 2 is installed on one side of the refrigerant tank 1, which is connected to the inside of the tank through a spray pipe 3;

[0037] A glass cylinder 4 is provided near one end of the spray pipe 3. A metal plate 5 is fixedly installed on the lower surface of the glass cylinder 4. A thermocouple 6 is fixedly installed on one side of the metal plate 5.

[0038] A heat insulation pad 7 is fixedly connected to the periphery of the metal disk 5, and a heating plate 8 is fixedly connected to one side of the heat insulation pad 7 at one end of the metal disk 5. The surface of the heat insulation pad 7 near one side is fixedly connected to the heating plate 8.

[0039] The insulation pad 7 is made of ceramic fiber and can withstand a temperature of 815℃. The thermocouple 6 is a type K thermocouple, which has the characteristics of wide temperature measurement range, high accuracy, good stability, high sensitivity and low cost. The thermocouple 6 is connected to the PID controller. The connection between the thermocouple 6 and the PID controller is common knowledge in the field and will not be described in detail here or shown in the figure. The PID controller can collect the temperature signal of the thermocouple 6 and adjust the power of the heating plate 8 to control the temperature at the required value. The heating plate 8 can provide a maximum temperature of 815℃. At the same time, the test environment conditions should be set at 23℃±3℃ and relative humidity of (50±5)%. During the experiment, a constant air flow rate is established between the glass cylinder 4 and the heating plate 8. This air flow dilutes the steam so that an optimal concentration for ignition is formed on the hot surface.

[0040] In this process, the heating value is set on the PID controller, and then the heating switch is turned on. The heating plate 8 starts heating, and the air circulation system of the test chamber 10 is turned on simultaneously. At this time, the valve of the refrigerant tank 1 is opened, and the valve is closed after 30 seconds. At this time, the temperature of the metal plate 5 should be stabilized. The temperature of the metal plate 5 should be stable within ±15℃ of the target temperature and be maintained for 5 minutes. Then, the valve 2 is opened. At this time, the refrigerant released onto the metal plate 5 is observed and recorded through the observation window 11. It is observed whether the refrigerant ignites (flames) within 3 minutes. If the flammable refrigerant is ignited, the temperature is reduced in increments of 20℃ until no ignition occurs. This temperature is recorded as the hot surface ignition temperature. At the same time, the exhaust port 12 of the test chamber 10 should be opened before each test to exhaust the gas, and the exhaust time should be at least 5 minutes to remove the residual flammable refrigerant gas inside the test chamber 10. At the same time, the above steps should be repeated for at least 5 tests for each test temperature before the temperature is recorded as the hot surface ignition temperature.

[0041] By setting up the test chamber 10, a relatively stable and controllable environment is provided for the entire test, confining the test to a specific space. This facilitates precise setting and adjustment of environmental conditions such as temperature, humidity, and airflow, while effectively avoiding interference from external environmental factors, ensuring the accuracy and reliability of the test. Its internal air circulation system ensures uniform air distribution within the chamber, guaranteeing a consistent test environment and helping to more accurately simulate actual working conditions, thus achieving both safety and accuracy in the test process. A refrigerant tank 1 with a valve is used to store refrigerant. The valve design facilitates control over the amount and timing of refrigerant release, allowing for precise release of a certain amount of refrigerant according to test requirements, meeting the quantitative needs of the test and ensuring accurate test results. A glass cylinder 4, with its transparent glass material, facilitates observation of the refrigerant's reaction on the metal plate, such as whether ignition (flame) occurs, for recording test data. The recording and analysis provide intuitive evidence. Simultaneously, its structure can protect the testing process to a certain extent, preventing refrigerant diffusion and the influence of external factors, thus achieving both testing safety and accurate results. The insulation pad 7, made of ceramic fiber, can withstand temperatures up to 815℃ and has excellent insulation properties, effectively preventing heat loss from the heating plate 8 and metal disc 5 to the surrounding environment, reducing heat loss, improving heating efficiency, and protecting surrounding components from high temperatures, thus achieving both testing safety and accurate results. The spray pipe 3 enables stable refrigerant delivery and controlled release, precisely spraying the refrigerant onto the metal disc 5, ensuring full contact between the refrigerant and the hot surface for accurate hot surface ignition temperature testing. The metal disc 5 also allows for uniform heat conduction from the heating plate 8, ensuring uniform heating of the refrigerant on its surface, thus achieving accurate test results.

[0042] like Figures 1-7 As shown, the distance between valve 2 and the valve on refrigerant tank 1 can hold a liquid volume of 1.0m³ ± 0.2m³.

[0043] By setting a certain spacing, the volume of retained liquid is guaranteed, which ensures that the amount of cooling agent sprayed onto the metal plate is relatively stable and can be precisely controlled during each test, thus achieving accurate test results.

[0044] like Figures 1-7 As shown, the length of the spray pipe 3 is 250mm ± 5.0mm, the outer diameter of the spray pipe 3 is ≤ 4mm, and the inner diameter of the spray pipe 3 is 1.6mm ± 0.1mm.

[0045] A spray pipe 3 of a certain length and outer diameter can reduce space occupation inside the test chamber 10 and improve space utilization. At the same time, a certain outer diameter helps to control the flow rate and pressure of the refrigerant in the pipe, so that the refrigerant can maintain an appropriate flow rate and pressure in the spray pipe 3, so that it can reach the surface of the metal plate 5 in a suitable state during spraying, ensuring the uniformity and stability of the spraying effect, thereby achieving accurate test results. In addition, by setting a certain inner diameter, the amount of refrigerant sprayed can be kept relatively stable during each test, thereby eliminating the interference of flow rate changes on the test results, and further improving the accuracy of the test results.

[0046] like Figures 1-7 As shown, the glass cylinder 4 has a length of 230mm ± 10mm and an inner diameter of 70mm ± 10mm.

[0047] The glass cylinder 4 of a certain length allows the tester to easily observe the internal conditions from the outside. The tester can clearly see the spraying of the refrigerant on the metal plate 5, the evaporation process, and whether there is any ignition, which is beneficial for accurately recording the test phenomena. Moreover, this length helps to establish a stable airflow velocity between the glass cylinder 4 and the heating plate 8. The air can form a relatively uniform airflow field inside the glass cylinder 4, making the dilution effect of the airflow on the refrigerant vapor more stable and uniform. This provides good airflow conditions for forming the optimal concentration for ignition on the hot surface, thus achieving accurate test results. Furthermore, the glass cylinder 4 of a certain inner diameter provides suitable space for the evaporation and possible combustion process of the refrigerant on the metal plate 5. This prevents the refrigerant vapor from being too dispersed due to an excessively large inner diameter, making it difficult to form the optimal concentration for ignition, and also prevents the space from being too cramped due to an excessively small inner diameter, which would restrict the evaporation of the refrigerant and the flow of airflow. Thus, the test can be carried out in a reasonable spatial environment.

[0048] like Figures 1-7 As shown, the diameter of metal disk 5 is 50mm±2.0mm, the thickness of metal disk 5 is 6±2.0mm, and the surface texture of metal disk 5 is ISO1302.

[0049] A metal disk 5 with a certain diameter and thickness facilitates heat conduction within the disk, resulting in a uniform surface temperature. This allows for a more accurate simulation of the thermal surface conditions under actual operating conditions, providing a reliable thermal environment for studying the ignition characteristics of the refrigerant. Consequently, the test results are more accurate. Furthermore, the surface texture of the metal disk 5 allows for better wetting and spreading of the refrigerant, forming a uniform liquid film. This facilitates more uniform absorption of heat from the metal disk surface by the refrigerant, promoting uniform evaporation and enhancing the repeatability and comparability of the test results.

[0050] like Figures 1-7As shown, the insulation pad 7 has a thickness of 6mm.

[0051] A more effective heat insulation layer is formed around the heating plate 8 and the metal disk 5, thereby reducing the loss of heat generated by the heating plate 8 to the surrounding environment, improving heating efficiency, enabling the metal disk 5 to reach and maintain the target temperature more quickly, and also helping to maintain the stability of the test environment temperature, reducing interference with the test results, thus achieving the stability of the test results.

[0052] like Figures 1-7 As shown, an observation window 11 is fixedly installed on one side surface of the test chamber 10, and an exhaust port 12 is fixedly installed on the upper surface of the test chamber 10.

[0053] The observation window 11 is made of explosion-proof glass.

[0054] By setting up the observation window 11 and the exhaust port 12, the testing process can be safely observed, thus achieving the effect of testing process safety. At the same time, the exhaust port 12 can quickly discharge the residual exhaust gas inside the test chamber 10, preparing for the next test, thereby improving the efficiency of the test.

[0055] Working principle: When the test begins, the test environment is first adjusted inside the test chamber 10. Then, the heating value is set by PID, the heating switch is turned on, the air circulation system of the test chamber 10 is turned on, the refrigerant tank 1 is opened, the valve 2 is opened, the refrigerant released onto the metal plate 5 is observed, and the test results are recorded to complete the test.

[0056] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A dedicated device for testing the ignition temperature of a hot surface (A2L), comprising a test chamber (10) and a spray pipe (3) built into the test chamber (10), characterized in that, One end of the spray pipe (3) is fixedly connected to a refrigerant tank (1) with a valve. A valve (2) is provided on one side of the refrigerant tank (1) and is connected to its interior through the spray pipe (3); A glass cylinder (4) is provided on one side of the spray pipe (3), and a metal plate (5) is fixedly installed on the lower surface of the glass cylinder (4). A thermocouple (6) is fixedly installed on one side of the metal plate (5). A heat insulation pad (7) is fixedly connected to the peripheral surface of the metal disk (5), and a heating plate (8) is fixedly connected to one side of the heat insulation pad (7) at one end of the metal disk (5). The surface of the heat insulation pad (7) near one side is fixedly connected to the heating plate (8).

2. The special equipment for testing the ignition temperature of A2L hot surface according to claim 1, characterized in that, The distance between the valve (2) and the valve on the refrigerant tank (1) is sufficient to retain a liquid volume of 1.0m³ ± 0.2m³.

3. The special equipment for testing the ignition temperature of A2L hot surface according to claim 1, characterized in that, The length of the spray pipe (3) is 250mm ± 5.0mm, the outer diameter of the spray pipe (3) is ≤ 4mm, and the inner diameter of the spray pipe (3) is 1.6mm ± 0.1mm.

4. The special equipment for testing the ignition temperature of A2L hot surface according to claim 1, characterized in that, The glass cylinder (4) is 230mm ± 10mm long and has an inner diameter of 70mm ± 10mm.

5. The special equipment for testing the ignition temperature of A2L hot surface according to claim 1, characterized in that, The metal disk (5) has a diameter of 50mm ± 2.0mm, a thickness of 6 ± 2.0mm, and a surface texture of ISO1302.

6. The special equipment for testing the ignition temperature of A2L hot surface according to claim 1, characterized in that, The insulation pad (7) has a thickness of 6 mm.

7. The special equipment for testing the ignition temperature of A2L hot surface according to claim 1, characterized in that, An observation window (11) is fixedly installed on one side surface of the test chamber (10), and an exhaust port (12) is fixedly installed on the upper surface of the test chamber (10).

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