Device and method for testing open fire resistance of filter element of air filter

Abstract

The invention relates to a heat resistance test technology for a filter element of an air filter, in particular to an open fire resistance test device and method for the filter element of the air filter. The open fire resistance test device for the filter element of the air filter comprises a fan, an air inlet pipe, a test box body, a three-axis displacement mechanism, a flame nozzle and a first air outlet pipe, the three-axis displacement mechanism is installed in the test box body, and the filter element of the air filter is installed between the three-axis displacement mechanism and an air inlet of the first air outlet pipe through a filter element installation part. The flame nozzle is installed on the three-axis displacement mechanism and is moved by the three-axis displacement mechanism, the spraying direction of the flame nozzle is the same as the air supply direction, and the filtering working direction of the air filter element is the same as the spraying direction of the flame nozzle. According to the test method, the observation and detection basis in the open fire resistance test process of the filter element of the air filter is determined, and scientific and reasonable technical support is provided for the open fire resistance test of the filter element of the air filter.

Description

Technical Field

[0001] The invention relates to a heat resistance test technology for an air filter element, in particular to an open flame resistance test device and method for an air filter element. Background Art

[0002] The high-efficiency air filter filters out dust, particles, bacteria and other impurities in the air through its internal filter to ensure the cleanliness of the air. In some flammable environments, after the combustibles produce open flames, a large amount of smoke and dust will be generated in the air. If these impurities cannot be effectively filtered by the filter, they will affect the cleanliness of the air and even affect people's health. At the same time, the open flames produced by the combustibles will also destroy the filtering effect of the filter. Therefore, nuclear-grade high-efficiency air filters with higher safety performance should have certain open flame resistance performance, be able to withstand the high temperature of the open flame for a certain period of time, ensure that the filter and its internal filter are not burned or melted, and ensure the service life and safety of the filter. Based on the above considerations, the open flame heat resistance test is a necessary test link, which can verify the filtering effect and heat resistance of the nuclear-grade high-efficiency air filter and provide guarantee for its performance in actual use. According to the structure of the air filter, the filter element is the component that is most prone to problems in the open flame environment. It is necessary to carry out targeted open flame resistance tests on the filter element of the air filter. However, the existing technology rarely involves this. Summary of the invention

[0003] In view of the problems pointed out in the background technology, the purpose of the present invention is to provide an air filter element open flame resistance test device and method, to achieve scientific and reasonable air filter element open flame resistance test, and to provide technical guarantee for the practical application of air filter elements.

[0004] To achieve the above object, the present invention adopts the following technical solutions: An open flame resistance test device for an air filter element, comprising a fan, an air inlet pipe, a test box, a three-axis displacement mechanism, a flame nozzle and a first air outlet pipe; one end of the test box is connected to the fan through the air inlet pipe, and the other end is connected to the first air outlet pipe, the air inlet of the first air outlet pipe faces the air supply direction of the fan, and the first air outlet pipe has a closable air outlet; the three-axis displacement mechanism is installed in the test box, the air filter element is installed between the three-axis displacement mechanism and the air inlet of the first air outlet pipe through a filter element installation part, the flame nozzle is installed on the three-axis displacement mechanism and moved by the three-axis displacement mechanism, the spray direction of the flame nozzle is the same as the air supply direction, the filtering working direction of the air filter element is the same as the spray direction of the flame nozzle, and the flame nozzle is connected to an external combustible gas source through a high-temperature resistant hose; the flame nozzle sprays flame to the air filter element to test the open flame resistance performance of the air filter element.

[0005] The three-axis displacement mechanism includes a first linear slide rail driven by a first motor, a second linear slide rail driven by a second motor, and a third linear slide rail driven by a third motor. The base of the first linear slide rail is fixedly connected to the test box. The moving direction of the slider A of the first linear slide rail is parallel to the injection direction of the flame nozzle. The base B of the second linear slide rail is installed on the slider A of the first linear slide rail. The base C of the third linear slide rail is installed on the slider B of the second linear slide rail. The flame nozzle 15 is installed on the slider C of the third linear slide rail.

[0006] The air inlet pipe is equipped with a pressure transmitter and an emergency air relief valve. The pressure transmitter measures the internal pressure of the air inlet pipe, and the emergency air relief valve releases pressure when the internal pressure of the air inlet pipe exceeds a set threshold. The air inlet pipe is equipped with a gas interface, and a high-temperature resistant hose is connected to an external combustible gas source through the gas interface.

[0007] A first orifice flow meter is installed on the air inlet pipe, and a second orifice flow meter is installed on the first air outlet pipe.

[0008] The test box is connected with an intelligent temperature transmitter, which measures the internal temperature of the test box; the flame nozzle is connected with a thermocouple and an electric ignition device, and the thermocouple measures the core flame temperature of the flame sprayed by the flame nozzle.

[0009] A leakage monitoring pipeline is connected between the first air outlet pipe and the test box, and the leakage monitoring pipeline is connected to a flow meter; the pipe opening of the leakage monitoring pipeline connected to the test box is located at a position on the test box corresponding to the filter element installation part, and the leakage monitoring pipeline returns the airflow in the main air outlet pipe to the air filter element.

[0010] The filter element mounting part is a frame structure, which is inserted into the inside of the test box. The test box is provided with an insertion port for inserting the filter element mounting part, and the insertion port and the filter element mounting part are sealed by a sealing ring; the test box is provided with a visual window and an infrared thermal imager at a position corresponding to the filter element mounting part, and the infrared thermal imager observes the flame length sprayed by the flame nozzle and whether the air filter element generates a flame at a specified position.

[0011] The filter element installation portion is connected with a core flame scale, and the core flame scale measures the distance from the core flame of the flame sprayed by the flame nozzle to the air filter element.

[0012] The first air outlet pipe is connected to the second air outlet pipe, the second air outlet pipe is provided with a solenoid valve, a water cooling control box is provided below the outlet of the second air outlet pipe, and the outlet of the second air outlet pipe is immersed under the liquid surface of the water cooling control box.

[0013] The present invention also provides an open flame resistance test method for an air filter element using the test device as described above, comprising the following steps: Step 1: Test preparation: Open the filter element installation part, install the air filter element into the filter element installation part, and then insert the filter element installation part together with the air filter element into the plug-in interface of the test box, and make a good seal between the filter element installation part and the plug-in interface of the test box; Step 2: Test the air tightness of the test pipeline; at this time, close the air outlet of the first air outlet pipe and the solenoid valve on the second air outlet pipe, turn on the fan, and the fan sends the airflow into the first air outlet pipe through the air inlet pipe, and the airflow returns to the air filter element through the air leakage monitoring pipeline. When the value measured by the air leakage monitoring pipeline is the same as that of the first orifice flowmeter, open the solenoid valve or the air outlet synchronously, and the airflow is monitored and recorded by the second orifice flowmeter. When the readings of the second orifice flowmeter and the first orifice flowmeter are the same, it proves that the air tightness of the test pipeline is qualified; Step 3: First measure the distance H from the flame core flame to the air filter element; at this time, open the air outlet of the first air outlet pipe or the solenoid valve on the second air outlet pipe, control the flame nozzle to reach the preset first measurement position through the three-axis displacement mechanism, turn on the fan, and input combustible gas into the flame nozzle; after the flame nozzle is ignited, measure the flame core flame temperature through a thermocouple, measure the H value through the core flame ruler, and adjust the H value to make the H value meet the test requirements; Step 4: Develop a test plan; develop a test plan with different measuring points and different air volumes based on the flame core temperature and H value; Step 5: Conduct the test according to the test plan. During the test, monitor the internal environment of the test box in real time, and use an infrared thermal imager to observe the flame length and whether the air filter element produces flames at the specified position. Step 6: End of the test.

[0014] Beneficial effects of the present invention: The test device provided by the present invention realizes the open flame resistance test of different positions of the air filter element through a three-axis displacement mechanism. The application of the three-axis displacement mechanism can control the open flame distance and is also convenient for digital control; the test method of the present invention determines the observation and detection basis during the open flame resistance test of the air filter element, and provides scientific and reasonable technical support for the open flame resistance test of the air filter element. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The present invention is a schematic diagram of the overall structure of an air filter element open flame resistance test device.

[0016] Figure 2 Flow chart of the test method of the present invention.

[0017] Figure 11- movable support plate, 2- inverter, 3- fan, 4- first flange, 5- first orifice flowmeter, 6- second flange, 7- high temperature hose, 8- pressure transmitter, 9- first motor, 10- temperature transmitter, 11- first linear slide, 12- second motor, 13- third linear slide, 14- first limit sensor, 15- flame nozzle, 16- infrared thermal imager, 17- visual window, 18- filter element installation part, 19- air filter Filter element, 20-flow meter 20, 21-second orifice flow meter, 22-third flange, 23-leakage monitoring pipeline, 24-air outlet, 25-water cooling control box, 26-outlet, 27-solenoid valve, sealing ring 28, 29-tightening clamp, core flame scale 30, 31-third motor, 32-second limit sensor, 33-test box, 34-emergency air release valve, 35-gas interface, 36-air inlet pipe, 37-connecting pipe, 38-thermocouple. DETAILED DESCRIPTION

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] like Figure 1As shown, the present invention first provides an air filter element open flame resistance test device, comprising a fan 3, an air inlet pipe 36, a test box 33, a three-axis displacement mechanism, a flame nozzle 15 and a first air outlet pipe; one end of the test box 33 is connected to the fan 3 through the air inlet pipe 36, and the other end is connected to the first air outlet pipe, the air inlet of the first air outlet pipe faces the air supply direction of the fan 3, and the first air outlet pipe has a closable air outlet 24; the three-axis displacement mechanism is installed in the test box 33, the air filter element 19 is installed between the three-axis displacement mechanism and the air inlet of the first air outlet pipe through the filter element installation part 18, the flame nozzle 15 is installed on the three-axis displacement mechanism and moved by the three-axis displacement mechanism, the injection direction of the flame nozzle 15 is the same as the air supply direction, the filtering working direction of the air filter element 19 is the same as the injection direction of the flame nozzle 15, and the flame nozzle 15 is connected to an external combustible gas source through a high temperature resistant hose 7; the flame nozzle 15 sprays flame to the air filter element 19 to test the open flame resistance performance of the air filter element 19. The three-axis displacement mechanism includes a first linear slide 11 driven by a first motor 9, a second linear slide (not shown) driven by a second motor 12, and a third linear slide 13 driven by a third motor 31. The base A (not shown) of the first linear slide 11 is fixedly connected to the test box 33. The moving direction of the slider A (not shown) of the first linear slide 11 is parallel to the injection direction of the flame nozzle 15. The base B (not shown) of the second linear slide (not shown) is installed on the slider A (not shown) of the first linear slide 11. The base C (not shown) of the third linear slide 13 is installed on the slider B (not shown) of the second linear slide (not shown), and the flame nozzle 15 is installed on the slider C (not shown) of the third linear slide 13. In the above structure, since the structure of the three-axis displacement mechanism and the linear slide belongs to the prior art, some structures are not shown in the figure, but the unshown parts do not affect the understanding of the technical solution of the present invention by those skilled in the art.

[0020] In one embodiment of the present invention, the travel of the three-axis displacement mechanism is limited by the first limit sensor 14 and the second limit sensor 32 to prevent collision accidents.

[0021] In one embodiment of the present invention, the test device is installed on a movable support plate 1, and the fan 3 is an axial flow fan controlled by a frequency converter 2. The fan 3 is connected together through a first flange 4 (model DN300), a connecting pipe 37 and an air inlet pipe 36. During the test, the frequency converter 2 drives the fan 3 to blow an adjustable rated air volume into the air inlet pipe 36, and is monitored in real time by a first orifice flowmeter 5. The air inlet pipe 36 is installed with a pressure transmitter 8 and an emergency air release valve 34. The pressure transmitter 8 measures the internal pressure of the air inlet pipe 36, and the emergency air release valve 34 releases the pressure when the internal pressure of the air inlet pipe 36 exceeds a set threshold. The air inlet pipe 36 is installed with a gas interface 35, and the high temperature resistant hose 7 is connected to an external combustible gas source through the gas interface 35. The flame nozzle 15 generates a flame length and temperature that meet the standard requirements. The air inlet pipe 36 is installed with a first orifice flowmeter 5, and the first air outlet pipe is installed with a second orifice flowmeter 21. In one embodiment of the present invention, the first orifice flowmeter 5 on the air inlet pipe 36 is connected to the air inlet pipe 36 through the connection of the second flange 6 (model DN350), and the second orifice flowmeter 21 is connected to the first air outlet pipe through the third flange 22; the structure and connection method of the orifice flowmeter are prior art and will not be repeated.

[0022] The test box 33 is connected to an intelligent temperature transmitter 10, which measures the internal temperature of the test box 33; the flame nozzle 15 is connected to a thermocouple 38 and an electric ignition device, and the thermocouple 38 measures the core flame temperature of the flame sprayed by the flame nozzle 15. The electric ignition device is a prior art and is not shown in the figure.

[0023] A leakage monitoring pipe 23 is connected between the first air outlet pipe and the test box 33, and the leakage monitoring pipe 23 is connected to a flow meter 20; the pipe opening of the leakage monitoring pipe 23 communicating with the test box 33 is located at a position on the test box 33 corresponding to the filter element installation portion 18, and the leakage monitoring pipe 23 returns the airflow in the main air outlet pipe to the air filter element 19. Specifically, the air filter element 19 has a filtering working direction. During the test, the test airflow is introduced from the filtering working direction. Figure 1 In the test, the filtering working direction of the air filter element 19 is from the left side to the right side. Therefore, the pipe opening connecting the air leakage monitoring pipe 23 and the test box 33 is between the left side and the right side of the air filter element 19, that is, the airflow returned by the air leakage monitoring pipe 23 enters the air filter element 19 from a direction perpendicular to the filtering working direction of the air filter element 19, which can make the air tightness test result of the test pipeline more accurate.

[0024] The filter element installation part 18 is a frame structure, which is inserted into the test box 33. The test box 33 is provided with an insertion port for the filter element installation part 18 to be inserted, and the insertion port and the filter element installation part 18 are sealed by a sealing ring 28; the test box 33 is provided with a visual window 17 and an infrared thermal imager 16 at a position corresponding to the filter element installation part 18, and the infrared thermal imager 16 observes the flame length sprayed by the flame nozzle 15 and whether the air filter element 19 generates a flame at a specified position. In one embodiment of the present invention, the air filter element 19 in the filter element installation part 18 is installed using a snap-on clamp 33, which can be easily and quickly installed and removed.

[0025] The filter element mounting portion 18 is connected to a core flame scale 30, which measures the distance from the core flame of the flame sprayed by the flame nozzle 15 to the air filter element 19, and can also measure the length of the core flame of the flame.

[0026] The first air outlet pipe is connected to the second air outlet pipe, the second air outlet pipe is provided with a solenoid valve 27 , a water cooling control box 25 is provided below the outlet 26 of the second air outlet pipe, and the outlet 26 of the second air outlet pipe is immersed under the liquid surface of the water cooling control box 25 .

[0027] The present invention also provides an open flame resistance test method for an air filter element using the test device as described above, comprising the following steps: Step 1, test preparation; open the filter element installation part 18, install the air filter element 19 into the filter element installation part 18, and then insert the filter element installation part 18 together with the air filter element 19 into the plug interface of the test box 33, and make a good seal between the filter element installation part 18 and the plug interface of the test box 33; Step 2: Test the air tightness of the test pipeline to ensure the rationality of the test; at this time, close the air outlet 24 of the first air outlet pipe and the solenoid valve 27 on the second air outlet pipe, turn on the fan 3, and the fan 3 sends the airflow into the first air outlet pipe through the air inlet pipe 36, and the airflow returns to the air filter element 19 through the air leakage monitoring pipeline 23. When the value measured by the air leakage monitoring pipeline 23 is the same as that of the first orifice flowmeter 5, the solenoid valve 27 or the air outlet 24 is opened synchronously, and the airflow is monitored and recorded by the second orifice flowmeter 21. When the readings of the second orifice flowmeter 21 and the first orifice flowmeter 5 are the same, it is proved that the air tightness of the test pipeline is qualified; Step 3: First measure the distance H from the flame core flame to the air filter element 19; at this time, open the air outlet 24 of the first air outlet pipe or the solenoid valve 27 on the second air outlet pipe, control the flame nozzle 15 to reach the preset first measurement position through the three-axis displacement mechanism, turn on the fan, and input combustible gas to the flame nozzle 15; after the flame nozzle 15 is ignited, measure the flame core flame temperature through the thermocouple 38, measure the H value through the core flame scale 30, and adjust the H value so that the H value meets the test requirements; Step 4: Develop a test plan; develop a test plan with different measuring points and different air volumes based on the flame core temperature and H value; Step 5: Conduct the test according to the test plan; during the test, monitor the internal environment of the test box 33 in real time, and observe the flame length and whether the air filter element 19 generates a flame at a specified position through the infrared thermal imager 16; Step 6: End of the test.

[0028] Specifically, in an example of the present invention, the test process adopts a fully automatic mode controlled by a host computer, wherein the three-axis displacement mechanism adopts PLC control, and the PLC controls the first motor 9, the second motor 12 and the third motor 31, and adjusts the position of the flame nozzle 15 through the first linear slide 11, the second linear slide and the third linear slide 13 to meet the requirements of the five test points of the open flame, and can be set to automatically adjust the position of the test point, or manually adjust. The thermocouple 38 detects the flame temperature and transmits it to the host computer; the infrared thermal imager 16 monitors the flame length in real time, and the host computer transmits the flame length and temperature signal to the PLC, which controls the external combustible gas input by calculation to change the flame length and temperature and stabilize it at the specified value. Each test point is tested for 5 minutes. When the test point is changed, that is, during the movement of the first linear slide 11, the second linear slide and the third linear slide 13, the flame nozzle 15 can be set to continue burning, or the device can turn off the flame after each test point is completed, and ignite again after the flame nozzle 15 moves to the test point.

[0029] Certainly, the test device of the present invention also has manual and automatic switching functions. At this moment, visual inspection is adopted in the test process, and the infrared thermal imager 16 has the video recording function in the test process in addition, and can detect whether the air filter element 19 has flame.

[0030] The parts not described in detail in this invention are prior art.

Claims

1. An air filter element open flame resistance test device, comprising a fan (3), an air inlet pipe (36), a test box (33), a three-axis displacement mechanism, a flame nozzle (15) and a first air outlet pipe; wherein: One end of the test box (33) is connected to the fan (3) via an air inlet pipe (36), and the other end is connected to a first air outlet pipe. The air inlet of the first air outlet pipe faces the air supply direction of the fan (3), and the first air outlet pipe has a closable air outlet (24). The three-axis displacement mechanism is installed in the test box (33). The air filter element (19) is installed between the three-axis displacement mechanism and the air inlet of the first air outlet pipe via a filter element installation portion (18). The flame nozzle (15) is installed on the three-axis displacement mechanism and moved by the three-axis displacement mechanism. The spraying direction of the flame nozzle (15) is the same as the air supply direction. The filtering working direction of the air filter element (19) is the same as the spraying direction of the flame nozzle (15). The flame nozzle (15) is connected to an external combustible gas source via a high temperature resistant hose (7). The flame nozzle (15) sprays flames onto the air filter element (19) to test the open flame resistance performance of the air filter element (19).

2. The air filter element flame resistance test device according to claim 1, characterized in that: The three-axis displacement mechanism comprises a first linear slide rail (11) driven by a first motor (9), a second linear slide rail driven by a second motor (12), and a third linear slide rail (13) driven by a third motor (31); a base A of the first linear slide rail (11) is fixedly connected to a test box (33); a moving direction of a slider A of the first linear slide rail (11) is parallel to a spraying direction of a flame nozzle (15); a base B of the second linear slide rail is mounted on the slider A of the first linear slide rail (11); a base C of the third linear slide rail (13) is mounted on the slider B of the second linear slide rail; and the flame nozzle (15) is mounted on the slider C of the third linear slide rail (13).

3. The air filter element flame resistance test device according to claim 1, characterized in that: The air inlet pipe (36) is installed with a pressure transmitter (8) and an emergency air release valve (34). The pressure transmitter (8) measures the internal pressure of the air inlet pipe (36), and the emergency air release valve (34) releases the pressure when the internal pressure of the air inlet pipe (36) exceeds a set threshold. The air inlet pipe (36) is installed with a gas interface (35), and the high temperature resistant hose (7) is connected to an external combustible gas source via the gas interface (35).

4. The air filter element flame resistance test device according to claim 1, characterized in that: A first orifice flow meter (5) is installed on the air inlet pipe (36), and a second orifice flow meter (21) is installed on the first air outlet pipe.

5. The air filter element flame resistance test device according to claim 1, characterized in that: The test box (33) is connected to an intelligent temperature transmitter (10), and the intelligent temperature transmitter (10) measures the internal temperature of the test box (33); the flame nozzle (15) is connected to a thermocouple (38) and an electric ignition device, and the thermocouple (38) measures the core flame temperature of the flame sprayed by the flame nozzle (15).

6. The air filter element flame resistance test device according to claim 1, characterized in that: An air leakage monitoring pipe (23) is connected between the first air outlet pipe and the test box (33), and the air leakage monitoring pipe (23) is connected to a flow meter (20); a pipe opening of the air leakage monitoring pipe (23) communicating with the test box (33) is located at a position on the test box (33) corresponding to the filter element mounting portion (18), and the air leakage monitoring pipe (23) returns the airflow in the main air outlet pipe to the air filter element (19).

7. The air filter element flame resistance test device according to claim 1, characterized in that: The filter element mounting portion (18) is a frame structure, which is inserted into the test box (33); the test box (33) is provided with an insertion port for the filter element mounting portion (18) to be inserted, and the insertion port and the filter element mounting portion (18) are sealed by a sealing ring (28); the test box (33) is provided with a visual window (17) and an infrared thermal imager (16) at a position corresponding to the filter element mounting portion (18), and the infrared thermal imager (16) observes the length of the flame sprayed by the flame nozzle (15) and whether the air filter element (19) generates a flame at a specified position.

8. The open flame resistance test device for an air filter element according to claim 7, characterized in that: The filter element mounting portion (18) is connected to a core flame scale (30), and the core flame scale (30) measures the distance from the core flame of the flame sprayed by the flame nozzle (15) to the air filter element (19).

9. The air filter element flame resistance test device according to claim 1, characterized in that: The first air outlet pipe is connected to a second air outlet pipe, a solenoid valve (27) is provided on the second air outlet pipe, a water cooling control box (25) is provided below the outlet (26) of the second air outlet pipe, and the outlet (26) of the second air outlet pipe is immersed below the liquid surface of the water cooling control box (25).

10. A method for testing the resistance of an air filter element to open flames using the test device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Experimental preparation; Open the filter element installation part (18), install the air filter element (19) into the filter element installation part (18), and then insert the filter element installation part (18) together with the air filter element (19) into the plug-in interface of the test box (33), and make a good seal between the filter element installation part (18) and the plug-in interface of the test box (33); Step 2: Test the air tightness of the test pipeline; at this time, close the air outlet (24) of the first air outlet pipe and the solenoid valve (27) on the second air outlet pipe, turn on the fan (3), and the fan (3) sends the airflow into the first air outlet pipe through the air inlet pipe (36), and the airflow then returns to the air filter element (19) through the air leakage monitoring pipeline (23). When the value measured by the air leakage monitoring pipeline (23) is the same as that of the first orifice flowmeter (5), the solenoid valve (27) or the air outlet (24) is opened synchronously, and the airflow is monitored and recorded by the second orifice flowmeter (21). When the readings of the second orifice flowmeter (21) and the first orifice flowmeter (5) are the same, it is proved that the air tightness of the test pipeline is qualified; Step 3: first measure the distance H between the flame core flame and the air filter element (19); at this time, open the air outlet (24) of the first air outlet pipe or the solenoid valve (27) on the second air outlet pipe, control the flame nozzle (15) to reach the preset first measurement position through the three-axis displacement mechanism, start the fan (3), and input combustible gas into the flame nozzle (15); after the flame nozzle (15) is ignited, measure the flame core flame temperature through the thermocouple (38), measure the H value through the core flame scale (30), and adjust the H value so that the H value meets the test requirements; Step 4: Develop a test plan; develop a test plan with different measuring points and different air volumes based on the flame core temperature and H value; Step 5: Conduct the test according to the test plan; during the test, monitor the internal environment of the test box (33) in real time, and observe the flame length and whether the air filter element (19) generates a flame at a designated position through an infrared thermal imager (16); Step 6: End of the test.

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