Device and method for testing hot airflow resistance of filter element of air filter

Abstract

The invention relates to a heat-resistant test technology for a filter element of an air filter, in particular to a heat-resistant airflow test device and method for the filter element of the air filter. The air filter element hot airflow resistance test device comprises a fan, a heater, an air inlet pipe, a test box body and a main air outlet pipe, one end of the heater is connected with the fan through a first air pipe, the other end of the heater is connected with the air inlet pipe through a second air pipe, the other end of the air inlet pipe is connected with the test box body, and the other end of the test box body is connected with the main air outlet pipe; the second air pipe is provided with a three-way electromagnetic valve and is connected with a bypass pipe through the three-way electromagnetic valve; and a filter element mounting part is mounted in the test box body. The test device provided by the invention has the function of inputting the hot air flow with the preset temperature and flow, and the hot air flow with the preset temperature and flow is input to realize the heat-resistant air flow test on the filter element of the air filter; the test method provided by the invention provides a new thought of how to carry out the hot airflow 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 a heat resistance airflow 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 are burned, 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 hot air flow generated 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 heat-resistant air flow performance, be able to withstand the high temperature of open flames 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 heat-resistant air flow test is a necessary test link, which can verify the filtering effect and heat-resistant performance 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 combustion environment. It is necessary to carry out targeted heat-resistant air flow 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 heat airflow resistance test device and method, to achieve scientific and reasonable air filter element heat airflow 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 air filter element heat-resistant airflow test device comprises a fan, a heater, an air inlet pipe, a test box and a main air outlet pipe; a heating element is arranged inside the heater, one end of the heater is connected to the fan through a first air duct, and the other end is connected to the air inlet pipe through a second air duct, the other end of the air inlet pipe is connected to the test box, and the other end of the test box is connected to the main air outlet pipe, the air inlet of the main air outlet pipe faces the air supply direction of the fan, and the main air outlet pipe has a closable air outlet; a three-way solenoid valve is installed on the second air duct and is connected to a bypass pipe through the three-way solenoid valve; a filter element installation part is installed in the test box, and the air filter element is fixed in front of the air inlet of the main air outlet pipe through the filter element installation part; The bypass pipe is connected to a preheating external air outlet. Before testing the heat air flow resistance of the air filter element, the second air duct and the bypass pipe are first connected, and the air inlet pipe is not connected. The fan inputs air flow to the heater, and the heater outputs hot air flow, which is output through the bypass pipe. When the hot air flow output by the heater meets the test temperature and flow conditions, the bypass pipe is closed, and the second air duct is connected to the air inlet pipe. The air inlet pipe inputs hot air flow that meets the temperature and flow conditions into the test box to test the heat air flow resistance of the air filter element installed in the test box.

[0005] The second air duct is installed with a temperature sensor and a flow meter A. The temperature sensor 5 and the flow meter A are installed on the second air duct between the three-way solenoid valve and the heater.

[0006] The air inlet pipe is equipped with an intelligent pressure transmitter and an emergency air release valve. The intelligent pressure transmitter measures the internal pressure of the air inlet pipe, and the emergency air release valve releases pressure when the internal pressure of the air inlet pipe exceeds a set threshold.

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

[0008] The test box is connected to an intelligent temperature transmitter, which measures the internal temperature of the test box.

[0009] A leakage monitoring pipeline is connected between the main air outlet pipe and the test box, and the leakage monitoring pipeline is connected to a flow meter B; 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 installation part is a frame structure, which is inserted into the test box. The test box is provided with an insertion port for the filter element installation part to be inserted. The insertion port and the filter element installation part are sealed by a sealing ring.

[0011] The test box is provided with a visual window and an infrared thermal imager at a position corresponding to the filter element installation portion, and the infrared thermal imager observes whether the air filter element generates flames.

[0012] The main air outlet pipe is connected to a second air outlet pipe, a solenoid valve is arranged on the second air outlet pipe, a water cooling control box is arranged 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 a method for testing the heat flow resistance of an air filter element using the test device as described above, comprising the following steps: Step 1: Test preparation: Remove 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: Perform an air tightness test on the test pipeline; at this time, first close the air outlet of the main air outlet duct and the solenoid valve on the second air outlet duct, turn on the fan, and the fan sends the airflow into the main air outlet duct through the air inlet duct, 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 second air duct, the solenoid valve or the air outlet is opened 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, adjust the hot air flow to the set temperature and flow rate; at this time, connect the second air duct and the bypass pipe, do not connect the air inlet pipe, input air flow to the heater by the fan, and the heater outputs hot air flow, which is output through the bypass pipe, and adjust the output power of the fan until the hot air flow output by the heater meets the test set temperature and flow conditions; Step 4: Conduct a heat-resistant airflow performance test. After completing step 3, open the air outlet of the main air outlet duct or the solenoid valve on the second air outlet duct, connect the second air duct and the air inlet duct, close the bypass duct, and allow the hot air flow that meets the test set temperature and flow conditions to enter the test box to conduct a heat-resistant airflow test on the air filter element. During the test, monitor the internal environment of the test box and the measured values ​​of the two plate hole flow meters in real time, and observe whether the air filter element generates flames through an infrared thermal imager. Step 5: End of the test.

[0014] Beneficial effects of the present invention: The test device provided by the present invention has the function of inputting a hot air flow with a preset temperature and flow, and realizes the heat air flow resistance test of the air filter element by inputting a hot air flow with a preset temperature and flow; The test method of the present invention provides a new idea on how to carry out the heat air flow resistance test of the air filter element, and provides scientific and reasonable technical support for the heat air flow 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 1In: 1- frequency converter, 2- fan, 3- heating electric control cabinet, 4- heater, 5- temperature sensor, 6- first flange, 7- preheating external air outlet, 8- second flange, 9- air inlet pipe, 10- first orifice flowmeter, 11- third flange, 12- intelligent pressure transmitter, 13- intelligent temperature transmitter, 14- visual window, 15- infrared thermal imager, 17- filter element installation part, 18- filter element, 19- flowmeter B, 20- second orifice flowmeter, 21- air leakage monitoring pipeline, 22- fourth flange, 23- water cooling control box, 24- solenoid valve, 25- outlet, 26- sealing ring, 27- support seat, 28- test box, 29- emergency relief valve, 30- three-way solenoid valve, 31- bypass pipe, 32- heating element, 33- clamping fixture, 34- air outlet, 35- second air duct, 36- flowmeter A. 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 1 As shown, the present invention first provides an air filter element heat resistance airflow test device, comprising a fan 2, a heater 4, an air inlet pipe 9, a test box 28 and a main air outlet pipe; a heating element 32 is arranged inside the heater 4, one end of the heater 4 is connected to the fan 2 through a first air duct, and the other end is connected to the air inlet pipe 9 through a second air duct 35, the other end of the air inlet pipe 9 is connected to the test box 28, and the other end of the test box 28 is connected to the main air outlet pipe, the air inlet of the main air outlet pipe faces the air supply direction of the fan 2, and the main air outlet pipe has a closable air outlet 34; a three-way solenoid valve 30 is installed on the second air duct 35 and a bypass pipe 31 is connected through the three-way solenoid valve 30; a filter element mounting portion 17 is installed in the test box 28, and the air filter element 18 is fixed in front of the air inlet of the main air outlet pipe through the filter element mounting portion 17; The bypass pipe 31 is connected to the preheating external air outlet 7. Before testing the heat air flow resistance performance of the air filter element 18, the second air duct 35 and the bypass pipe 31 are first connected, and the air inlet pipe 9 is not connected. The fan 2 inputs air flow to the heater 4, and the heater 4 outputs hot air flow, which is output through the bypass pipe 31. When the hot air flow output by the heater 4 meets the test temperature and flow conditions, the bypass pipe 31 is closed, and the second air duct 35 is connected to the air inlet pipe 9. The air inlet pipe 9 inputs hot air flow that meets the temperature and flow conditions into the test box 28 to test the heat air flow resistance performance of the air filter element 18 installed in the test box 28.

[0020] In one embodiment of the present invention, the test device is installed on a movable support seat 27, the fan 2 is an axial flow fan controlled by a frequency converter 1, the heater 4 is an electric heater controlled by a heating electric control cabinet 3, the heating element 32 adopts a cyclic heating method for the input airflow, and the pressure of the circulating airflow in the pipeline is balanced and adjusted by connecting the air inlet and the preheating external air outlet 7 during the cyclic heating and heating process; the three-way solenoid valve 30 is installed on the second air duct 35 through the first flange 6 (model DN300) and the second flange 8 (model DN350). The axial flow fan, the electric heater and the three-way solenoid valve 30 are all existing technologies and will not be described in detail.

[0021] The second air duct 35 is installed with a temperature sensor 5 and a flow meter A36 . The temperature sensor 5 and the flow meter A36 are installed on the second air duct 35 between the three-way solenoid valve 30 and the heater 4 .

[0022] The air inlet pipe 9 is equipped with an intelligent pressure transmitter 12 and an emergency air release valve 29. The intelligent pressure transmitter 12 measures the internal pressure of the air inlet pipe 9, and the emergency air release valve 29 releases pressure when the internal pressure of the air inlet pipe 9 exceeds a set threshold. In one embodiment of the present invention, the intelligent pressure transmitter 12 and the emergency air release valve 29 are linked through a control system. When the intelligent pressure transmitter 12 measures that the internal pressure of the air inlet pipe 9 reaches the set threshold, the emergency air release valve 29 releases pressure.

[0023] The first orifice flowmeter 10 is installed on the air inlet pipe 9, and the second orifice flowmeter 20 is installed on the main air outlet pipe. In one embodiment of the present invention, the first orifice flowmeter 10 is installed on the air inlet pipe 9 through a third flange (model DN350), and the second orifice flowmeter 20 is installed on the main air outlet pipe through a fourth flange (model DN350). During the test, according to the measured values ​​of the first orifice flowmeter 10 and the second orifice flowmeter 20, it can be determined whether the air filter element 18 is damaged.

[0024] The test box 28 is connected to an intelligent temperature transmitter 13 , and the intelligent temperature transmitter 13 measures the internal temperature of the test box 28 .

[0025] A leakage monitoring pipe 21 is connected between the main air outlet pipe and the test box 28, and the leakage monitoring pipe 21 is connected to a flow meter B19; the pipe opening of the leakage monitoring pipe 21 communicating with the test box 28 is located at a position on the test box 28 corresponding to the filter element installation portion 17, and the leakage monitoring pipe 21 returns the airflow in the main air outlet pipe to the air filter element 18. Specifically, the air filter element 18 has a filtering working direction. During the test, the test airflow is introduced from the filtering working direction. Figure 1In the test, the filtering working direction of the air filter element 18 is from the left side to the right side. Therefore, the pipe opening connecting the air leakage monitoring pipe 21 and the test box 28 is between the left side and the right side of the air filter element 18, that is, the direction in which the airflow returned by the air leakage monitoring pipe 23 enters the air filter element 18 is perpendicular to the filtering working direction of the air filter element 18, which can make the air tightness test result of the test pipeline more accurate.

[0026] The filter element installation part 17 is a frame structure, which is inserted into the test box 28. The test box 28 is provided with an insertion port for the filter element installation part 17 to be inserted, and the insertion port and the filter element installation part 17 are sealed by a sealing ring 26. In one embodiment of the present invention, the air filter element 18 in the filter element installation part 17 is installed using a snap-on clamp 33, which can be installed and removed conveniently and quickly.

[0027] The test box 28 is provided with a visual window 14 and an infrared thermal imager 15 at a position corresponding to the filter element installation portion 17, and the infrared thermal imager 15 observes whether the air filter element 18 generates flames. In one embodiment of the present invention, the infrared thermal imager 15 is also connected to a camera and has a video recording function during the test process.

[0028] The main air outlet pipe is connected to the second air outlet pipe, the second air outlet pipe is provided with a solenoid valve 24, a water cooling control box 23 is provided below the outlet 25 of the second air outlet pipe, and the outlet 25 of the second air outlet pipe is immersed under the liquid level of the water cooling control box 23. This structure realizes the cold treatment discharge of the gas.

[0029] The present invention also provides a method for testing the heat flow resistance of an air filter element using the test device as described above, comprising the following steps: Step 1, test preparation; remove the filter element installation part 17, install the air filter element 18 into the filter element installation part 17, and then insert the filter element installation part 17 together with the air filter element 18 into the plug interface of the test box 28, and make a good seal between the filter element installation part 17 and the plug interface of the test box 28; Step 2, perform air tightness test on the test pipeline; at this time, first close the air outlet 34 of the main air outlet pipe and the solenoid valve 24 on the second air outlet pipe, turn on the fan 2, and the fan 2 sends the airflow into the main air outlet pipe through the air inlet pipe 9, and the airflow returns to the air filter element 18 through the air leakage monitoring pipeline 21. When the value measured by the air leakage monitoring pipeline 21 is the same as that of the second air duct 35, the solenoid valve 24 or the air outlet 34 is opened synchronously, and the airflow is monitored and recorded by the second orifice flowmeter 20. When the readings of the second orifice flowmeter 20 and the first orifice flowmeter 10 are the same, it is proved that the air tightness of the test pipeline is qualified; Step 3, adjusting the hot air flow to the set temperature and flow rate; at this time, the second air duct 35 and the bypass pipe 31 are connected, and the air inlet pipe 9 is not connected, the fan 2 inputs air flow to the heater 4, and the heater 4 outputs hot air flow, which is output through the bypass pipe 31, and the output power of the fan 2 is adjusted until the hot air flow output by the heater 4 meets the test set temperature and flow rate conditions; in one embodiment of the present invention, the test set temperature is required to be 371±28°C. Through the device of the present invention, the above temperature conditions can be met at different set flow rates; Step 4: Conduct a heat-resistant airflow performance test; after completing step 3, open the air outlet 34 of the main air outlet duct or the solenoid valve 24 on the second air outlet duct, connect the second air duct 35 and the air inlet duct 9, close the bypass duct, and allow the hot air flow that meets the test set temperature and flow conditions to enter the test box 28, and conduct a heat-resistant airflow test on the air filter element 18; during the test, monitor the internal environment of the test box 28 and the measured values ​​of the two plate hole flow meters in real time, and observe whether the air filter element 18 generates flames through the infrared thermal imager 15; Step 5: End of the test.

[0030] Parts of the present invention not described in detail are prior art.

Claims

1. An air filter element heat resistance airflow test device, comprising a fan (2), a heater (4), an air inlet pipe (9), a test box (28) and a main air outlet pipe; wherein: The heater (4) is provided with a heating element (32) inside. One end of the heater (4) is connected to the fan (2) via a first air duct, and the other end is connected to the air inlet pipe (9) via a second air duct (35). The other end of the air inlet pipe (9) is connected to a test box (28). The other end of the test box (28) is connected to a main air outlet pipe. The air inlet of the main air outlet pipe faces the air supply direction of the fan (2). The main air outlet pipe has a closable air outlet (34). A three-way solenoid valve (30) is installed on the second air duct (35) and is connected to a bypass pipe (31) via the three-way solenoid valve (30). A filter element mounting portion (17) is installed in the test box (28). The air filter element (18) is fixed in front of the air inlet of the main air outlet pipe via the filter element mounting portion (17). The bypass pipe (31) is connected to a preheating external air outlet (7). Before testing the heat-resistant airflow performance of the air filter element (18), the second air pipe (35) and the bypass pipe (31) are first connected, and the air inlet pipe (9) is disconnected. The fan (2) inputs airflow to the heater (4), and the heater (4) outputs hot airflow, which is output through the bypass pipe (31). When the hot airflow output by the heater (4) meets the test temperature and flow conditions, the bypass pipe (31) is closed, the second air pipe (35) is connected to the air inlet pipe (9), and the air inlet pipe (9) inputs hot airflow that meets the temperature and flow conditions to the test box (28), so as to test the heat-resistant airflow performance of the air filter element (18) installed in the test box (28).

2. The air filter element heat resistance airflow test device according to claim 1, characterized in that: The second air duct (35) is installed with a temperature sensor (5) and a flow meter A (36). The temperature sensor (5) and the flow meter A (36) are installed on the second air duct (35) between the three-way solenoid valve (30) and the heater (4).

3. The air filter element heat resistance airflow test device according to claim 1, characterized in that: The air inlet pipe (9) is installed with an intelligent pressure transmitter (12) and an emergency air release valve (29). The intelligent pressure transmitter (12) measures the internal pressure of the air inlet pipe (9), and the emergency air release valve (29) releases pressure when the internal pressure of the air inlet pipe (9) exceeds a set threshold.

4. The air filter element heat resistance airflow test device according to claim 1, characterized in that: A first orifice flow meter (10) is installed on the air inlet pipe (9), and a second orifice flow meter (20) is installed on the main air outlet pipe.

5. The air filter element heat resistance airflow test device according to claim 1, characterized in that: The test box (28) is connected to an intelligent temperature transmitter (13), and the intelligent temperature transmitter (13) measures the internal temperature of the test box (28).

6. The air filter element heat resistance airflow test device according to claim 1, characterized in that: An air leakage monitoring pipe (21) is connected between the main air outlet pipe and the test box (28), and the air leakage monitoring pipe (21) is connected to a flow meter B19; the pipe opening of the air leakage monitoring pipe (21) communicating with the test box (28) is located at a position on the test box (28) corresponding to the filter element mounting portion (17), and the air leakage monitoring pipe (21) returns the air flow in the main air outlet pipe to the air filter element (18).

7. The air filter element heat resistance airflow test device according to claim 1, characterized in that: The filter element mounting portion (17) is a frame structure, which is inserted into the interior of the test box (28); the test box (28) is provided with an insertion port for the filter element mounting portion (17) to be inserted; the insertion port and the filter element mounting portion (17) are sealed by a sealing ring (26).

8. The air filter element heat resistance airflow test device according to claim 1, characterized in that: The test box (28) is provided with a visual window (14) and an infrared thermal imager (15) at a position corresponding to the filter element mounting portion (17), and the infrared thermal imager (15) observes whether the air filter element (18) generates flames.

9. The air filter element heat resistance airflow test device according to claim 1, characterized in that: The main air outlet pipe is connected to a second air outlet pipe, a solenoid valve (24) is provided on the second air outlet pipe, a water cooling control box (23) is provided below the outlet (25) of the second air outlet pipe, and the outlet (25) of the second air outlet pipe is immersed below the liquid surface of the water cooling control box (23).

10. A method for testing the heat flow resistance of an air filter element using the test device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Test preparation: remove the filter element installation part (17), install the air filter element (18) into the filter element installation part (17), and then insert the filter element installation part (17) together with the air filter element (18) into the plug-in interface of the test box (28), and make a good seal between the filter element installation part (17) and the plug-in interface of the test box (28); Step 2: Perform an air tightness test on the test pipeline; at this time, first close the air outlet (34) of the main air outlet pipe and the solenoid valve (24) on the second air outlet pipe, turn on the fan (2), and the fan (2) sends the airflow into the main air outlet pipe through the air inlet pipe (9), and the airflow then returns to the air filter element (18) through the air leakage monitoring pipe (21). When the value measured by the air leakage monitoring pipe (21) is the same as that of the second air pipe (35), the solenoid valve (24) or the air outlet (34) is opened synchronously, and the airflow is monitored and recorded by the second orifice flowmeter (20). When the readings of the second orifice flowmeter (20) and the first orifice flowmeter (10) are the same, it is proved that the air tightness of the test pipeline is qualified; Step 3: Adjust the hot air flow to a set temperature and flow rate; at this time, the second air duct (35) and the bypass duct (31) are connected, and the air inlet duct (9) is disconnected, and the air flow is input from the fan (2) to the heater (4), and the heater (4) outputs the hot air flow, which is output through the bypass duct (31), and the output power of the fan (2) is adjusted until the hot air flow output by the heater (4) meets the set temperature and flow rate conditions of the test; Step 4: Conduct a heat-resistance airflow performance test; after completing step 3, open the air outlet (34) of the main air outlet duct or the solenoid valve (24) on the second air outlet duct, connect the second air duct (35) and the air inlet duct (9), close the bypass duct, and allow the hot air flow that meets the test set temperature and flow conditions to enter the test box (28), and conduct a heat-resistance airflow test on the air filter element (18); During the test, the internal environment of the test box (28) and the measured values ​​of the two plate hole flow meters are monitored in real time, and at the same time, an infrared thermal imager (15) is used to observe whether the air filter element (18) generates flames; Step 5: End of the test.

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