A replaceable filter element filter absorber with self-checking function and a replacement and self-checking method

Abstract

The present invention provides a replaceable filter element filter absorber with a self-checking function and a replacement and self-checking method, which comprises a replaceable filter element filter absorber and a self-checking device, wherein the replaceable filter element filter absorber has an air filling port and a pressure taking port, and the self-checking device is installed on the replaceable filter element filter absorber and connected to the air filling port and the pressure taking port of the replaceable filter element filter absorber through an air pipe. The replaceable filter element filter absorber with a self-checking function can filter dust and aerosols, and filter toxic and harmful gases, and has the functions of replacing fine filter elements and poison filter elements, as well as a self-checking function for air leakage coefficient.

Description

Technical Field

[0001] The present invention relates to a replaceable filter element filter absorber with a self-checking function, which belongs to collective protection equipment in the field of chemical defense technology. The equipment is mainly used in various collective protection systems to filter out chemical agents, biological warfare agents and radioactive dust in contaminated air and provide clean air to the collective protection system. The equipment has the functions of replacing fine filter elements and gas filter elements and self-checking of air leakage coefficient. Background Art

[0002] At present, replaceable products all have replacement and installation process risks, and replaceable filter absorbers for nuclear, biological and chemical applications are no exception. If the fine filter element and the gas filter element of the filter absorber are replaced, if the product is not installed in place, there will be an airflow short circuit, and the fine filter element and the gas filter element will not function, causing product failure. In order to solve this problem, the mass structure of the filter absorber is analyzed and it is believed that if the fine filter element and the gas filter element are not installed in place, the leakage coefficient test of the filter absorber will fail. Therefore, after the fine filter element and the gas filter element are replaced, if the leakage coefficient test can be performed, it will greatly reduce the replacement risk and improve the reliability of the product. Summary of the invention

[0003] The purpose of the present invention is to provide a replaceable filter element filter absorber with a self-checking function and a replacement and self-checking method in view of the above-mentioned defects. The fine filter element and the gas filter element of the filter absorber can be replaced. After replacement, the leakage coefficient test can be carried out, the leakage coefficient value can be read out in real time, and it can be intelligently judged whether the product is installed properly.

[0004] In order to realize the above technical features, the object of the present invention is achieved as follows: a replaceable filter element filter absorber with a self-checking function, comprising a replaceable filter element filter absorber, wherein a self-checking device for detecting whether it is leaking is fixedly installed on the top of the replaceable filter element filter absorber;

[0005] The replaceable filter element filter absorber comprises a shell, an air outlet grille and a filter absorber air outlet cylinder are fixedly mounted on the bottom of the shell through a steel ring, a top cover is fixedly mounted on the top of the shell, a filter absorber air inlet cylinder is arranged at the top center of the top cover, and a central cylinder, a fine filter element and a poison filter element are positioned and mounted in sequence from the center to the periphery between the air outlet grille and the top cover;

[0006] The top cover is provided with a filter absorber inflation port and a filter absorber pressure port, and the filter absorber inflation port and the filter absorber pressure port are both connected with the annular cavity surrounded by the fine filter element and the poison filter element; the filter absorber inflation port and the filter absorber pressure port are connected to the self-test device in a detachable manner.

[0007] The top cover is detachably mounted on the top of the housing through a butterfly nut, and a second sealing ring is provided between the top cover and the housing;

[0008] The self-checking device is detachably mounted on the top of the replaceable filter element filter absorber by means of a plurality of cross pan head screws.

[0009] An air outlet cover is fixedly mounted on the bottom end of the air outlet cylinder of the filter absorber via a butterfly nut, and an air outlet sealing gasket is arranged on the contact end surface between the air outlet cover and the air outlet cylinder of the filter absorber.

[0010] An air inlet cover is fixed on the top of the air inlet cylinder of the filter absorber, and an air inlet is arranged on the air inlet cylinder of the filter absorber.

[0011] The bottom end of the central cylinder is welded and fixed on the air outlet grille, and the top end is fixedly connected to the top cover through a circular flange, and a first sealing ring is arranged on the joint end surface of the two.

[0012] The bottom end of the fine filter element is positioned and installed on the upper end surface of the air outlet grille through a first bottom positioning ring, and the top end is positioned and installed on the lower end surface of the top cover through a first top positioning ring; a first bottom V-shaped sealing ring is provided at the contact end surface between the fine filter element and the air outlet grille; a first top V-shaped sealing ring is provided at the contact end surface between the fine filter element and the top cover; a first O-shaped sealing ring is provided between the fine filter element and the first bottom positioning ring.

[0013] The bottom end of the drug filter element is positioned and installed on the upper end surface of the air outlet grille by a second bottom positioning ring, and the top end is positioned and installed on the lower end surface of the top cover by a second top positioning ring; a second bottom V-shaped sealing ring is provided on the contact end surface of the drug filter element and the air outlet grille; a second top V-shaped sealing ring is provided on the contact end surface of the drug filter element and the top cover; a second O-shaped sealing ring is provided between the drug filter element and the second bottom positioning ring.

[0014] The self-test device comprises an air pump, the air inlet of the air pump is connected to the atmosphere, the air outlet is connected to a tee, one end of the tee is connected to a flow meter, the other end of the flow meter is connected to the air inlet, the air inlet is connected to the air inlet of the filter absorber through an air inlet pipe; the other end of the tee is connected to one end of a needle valve, the other end of the needle valve is connected to the atmosphere;

[0015] The pressure port of the filter absorber is connected to the pressure port of the pressure sensor through a pressure pipe; the pressure sensor, flow meter, and air pump are connected to a microcontroller, a display screen is connected to the signal output end of the microcontroller, and the microcontroller and the air pump are both connected to a power supply;

[0016] The self-checking device increases or reduces the pressure inside the replaceable filter element filter absorber through the filter absorber inflation port, and displays the flow in real time. At the same time, it obtains the internal pressure of the replaceable filter element filter absorber in real time through the filter absorber pressure taking port.

[0017] A method for replacing a filter element of a replaceable filter element filter absorber with a self-checking function comprises the following steps:

[0018] The first step is to determine the time to replace the filter element: when the replaceable filter element filter absorber with a self-checking function has been used for a period of time, a large amount of dust has accumulated on the fine filter element, or the gas filter element is contaminated, moldy, or damaged, the gas filter element needs to be replaced;

[0019] Step 2: Remove the old filter element: Under the premise of taking necessary personal protection measures, loosen the butterfly nut on the top cover, remove the top cover, take out the gas filter element or fine filter element to be replaced, and seal it with a sealing bag;

[0020] Step 3: Check and clean: Check the top cover, the second bottom V-shaped seal ring, the first bottom V-shaped seal ring, the first top V-shaped seal ring and the second top V-shaped seal ring for damage. If damaged, they should be replaced and the inside of the shell should be cleaned;

[0021] The fourth step is to install the new filter element: glue the second bottom V-shaped sealing ring, the first bottom V-shaped sealing ring, the first top V-shaped sealing ring and the second top V-shaped sealing ring to the original installation position of the fine filter element or the gas filter element, put the fine filter element or the gas filter element into the original position in the housing, cover the top cover, and tighten the butterfly nut.

[0022] The air tightness self-checking method of the replaceable filter element filter absorber with self-checking function comprises the following steps:

[0023] The first step is sealing: cover and seal the filter absorber air inlet and filter absorber air outlet, connect the filter absorber air inlet and air inlet with an air filling pipe, and connect the filter absorber pressure taking port and pressure taking port with a pressure taking pipe;

[0024] The second step is to start the machine: connect the power supply of the self-test device and start it;

[0025] Step 3: Set the rated air volume: Enter the rated air volume A of the replaceable filter element filter absorber with self-checking function on the display screen of the self-checking device;

[0026] Step 4: Inflation: Start the air pump on the display screen of the self-test device to inflate the replaceable filter element filter absorber, and adjust the needle valve opening to stabilize the internal pressure of the replaceable filter element filter absorber at D and maintain T. At this time, the flow rate measured by the flow meter is the leakage volume B;

[0027] The fifth step is to read the result. According to the formula: Leakage coefficient C = (B\A) × 100%, the self-test device automatically calculates the leakage coefficient and displays it on the display screen.

[0028] The present invention has the following beneficial effects:

[0029] 1. Both the fine filter element and the gas filter element can be quickly replaced according to actual usage.

[0030] 2. The air tightness of the filter absorber can be tested in real time at the user's site, so that the user can quickly obtain the air tightness information of the filter absorber, thereby judging the reliability of the product's performance and providing a decision-making basis for whether the filter absorber can be used.

[0031] 3. Within the measurement accuracy range of the flow meter, the accurate value of the leakage coefficient of the filter absorber can be measured, instead of only being able to obtain the range of the leakage coefficient during normal testing, which makes it easier to accurately grasp the air tightness quality level of the filter absorber.

[0032] 4. After the filter element of a replaceable filter absorber is replaced, the quality level of the filter element replacement and whether the air tightness of the product is guaranteed have always been a blind spot. The present invention can perform on-site air tightness inspection on the filter absorber after the filter element is replaced, providing a quick evaluation method that is easy to use on-site to eliminate the blind spot.

[0033] 5. Compared with ordinary replaceable filter absorbers, the replaceable filter element filter absorber with self-checking function does not increase the product volume much.

[0034] 6. The above-mentioned self-test device can pressurize or relieve the pressure inside the replaceable filter element filter absorber through the filter absorber inflation port on the top cover, and display the flow in real time. At the same time, the internal pressure of the replaceable filter element filter absorber can be obtained in real time through the filter absorber pressure taking port.

[0035] 7. Before the replaceable filter element filter absorber with self-test function is used for the first time, or before being used after being stored for a long time, or before being used again after the fine filter element or the poison filter element is replaced, the product leakage coefficient can be tested directly at the use or replacement site to determine whether the product is leaking on site, providing a decision-making basis for whether the product can be used, without returning to the factory or going to the laboratory for performance testing to determine whether the product can be used. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0037] Figure 1 It is a schematic diagram of the top structure of the present invention.

[0038] Figure 2 It is a front view structural schematic diagram of the present invention.

[0039] Figure 3 It is the gas path principle diagram of the present invention.

[0040] Figure 4 It is the control principle diagram of the present invention.

[0041] In the figure: replaceable filter element filter absorber 1, self-test device 2, cross pan head screw 3, inflation pipe 4, filter absorber inflation port 5, air inlet cover 6, filter absorber air inlet 7, hexagon head screw 8, filter absorber pressure port 9, pressure pipe 10, inflation port 11, needle valve 12, flow meter 13, power supply 14, display screen and microcontroller 15, pressure sensor 16, inflation pump 17, pressure port 18, top cover 19, butterfly nut 20, shell 21, filter absorber air outlet 22, air outlet sealing gasket 23, Air outlet cover 24, steel ring 25, air outlet grille 26, second bottom V-shaped sealing ring 27, poison filter element 28, second O-shaped sealing ring 29, second bottom positioning ring 30, first bottom V-shaped sealing ring 31, first O-shaped sealing ring 32, first bottom positioning ring 33, fine filter element 34, center cylinder 35, circular flange 36, first sealing ring 37, first top V-shaped sealing ring 38, first top positioning ring 39, second top V-shaped sealing ring 40, second top V-shaped sealing ring 41, second sealing ring 42. DETAILED DESCRIPTION

[0042] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0043] Embodiment 1:

[0044] See also Figure 1-4 A replaceable filter element filter absorber with a self-checking function, comprising a replaceable filter element filter absorber 1, wherein a self-checking device 2 for detecting whether it is leaking is fixedly installed on the top of the replaceable filter element filter absorber 1; the replaceable filter element filter absorber 1 comprises a shell 21, wherein an air outlet grille 26 and a filter absorber air outlet cylinder 22 are fixedly installed on the bottom of the shell 21 through a steel ring 25, a top cover 19 is fixedly installed on the top of the shell 21, and a filter absorber air inlet is arranged at the top center of the top cover 19. Cylinder 7, a central cylinder 35, a fine filter element 34 and a gas filter element 28 are positioned and installed in sequence from the center to the periphery between the air outlet grille 26 and the top cover 19; the top cover 19 is provided with a filter absorber air filling port 5 and a filter absorber pressure port 9, the filter absorber air filling port 5 and the filter absorber pressure port 9 are both connected to the annular cavity surrounded by the fine filter element 34 and the gas filter element 28; the filter absorber air filling port 5 and the filter absorber pressure port 9 are connected to the self-test device 2 in a detachable manner. By adopting the above-mentioned replaceable filter element filter absorber, dust and aerosol filtration, toxic and harmful gas filtration can be performed, and it has the function of replacing the fine filter element and the gas filter element, as well as the function of self-testing the air leakage coefficient.

[0045] Furthermore, the top cover 19 is detachably mounted on the top of the housing 21 through a butterfly nut 20, and a second sealing ring 42 is provided between the top cover 19 and the housing 21; the self-test device 2 is detachably mounted on the top of the replaceable filter element filter absorber 1 through a plurality of cross pan head screws 3. The above structure allows for convenient disassembly.

[0046] Furthermore, an air outlet cover 24 is fixedly mounted on the bottom end of the filter absorber air outlet cylinder 22 via a butterfly nut, and an air outlet sealing gasket 23 is provided on the contact end surface between the air outlet cover 24 and the filter absorber air outlet cylinder 22; an air outlet is provided on the side wall of the filter absorber air outlet cylinder 22.

[0047] Furthermore, an air inlet cover plate 6 is fixed to the top of the filter absorber air inlet cylinder 7 , and an air inlet port is arranged on the filter absorber air inlet cylinder 7 .

[0048] Furthermore, the bottom end of the central cylinder 35 is welded and fixed on the air outlet grille 26, and the top end thereof is fixedly connected to the top cover 19 via a circular flange 36, and a first sealing ring 37 is provided at the joint end surface of the two. The above connection method ensures air tightness.

[0049] Furthermore, the bottom end of the fine filter element 34 is positioned and installed on the upper end surface of the air outlet grille 26 through the first bottom positioning ring 33, and the top end thereof is positioned and installed on the lower end surface of the top cover 19 through the first top positioning ring 39; the contact end surface of the fine filter element 34 with the air outlet grille 26 is provided with a first bottom V-shaped sealing ring 31; the contact end surface of the fine filter element 34 with the top cover 19 is provided with a first top V-shaped sealing ring 38; and a first O-shaped sealing ring 32 is provided between the fine filter element 34 and the first bottom positioning ring 33. The fine filter element 34 can be easily replaced through the above positioning and installation structure.

[0050] Furthermore, the bottom end of the gas filter element 28 is positioned and installed on the upper end surface of the air outlet grille 26 through the second bottom positioning ring 30, and the top end thereof is positioned and installed on the lower end surface of the top cover 19 through the second top positioning ring 41; the contact end surface of the gas filter element 28 and the air outlet grille 26 is provided with a second bottom V-shaped sealing ring 27; the contact end surface of the gas filter element 28 and the top cover 19 is provided with a second top V-shaped sealing ring 40; and a second O-shaped sealing ring 29 is provided between the fine filter element 34 and the second bottom positioning ring 30. The gas filter element 28 can be easily replaced through the above positioning and installation structure.

[0051] Furthermore, the self-test device 2 includes an air pump 17, the air inlet of the air pump 17 is connected to the atmosphere, and the air outlet is connected to a tee, one end of the tee is connected to a flow meter 13, the other end of the flow meter 13 is connected to an air inlet 11, and the air inlet 11 is connected to an air inlet 5 of the filter absorber through an air inlet pipe 4; the other end of the tee is connected to one end of a needle valve 12, and the other end of the needle valve 12 is connected to the atmosphere;

[0052] Furthermore, the filter absorber pressure port 9 is connected to the pressure port 18 of the pressure sensor 16 through the pressure pipe 10; the pressure sensor 16, the flow meter 13, the air pump 17 are connected to the microcontroller 43, the signal output end of the microcontroller 43 is connected to the display screen 15, and the microcontroller 43 and the air pump 17 are both connected to the power supply 14;

[0053] Furthermore, the self-test device 2 increases or reduces the pressure inside the replaceable filter element filter absorber 1 through the filter absorber inflation port 5, displays the flow in real time, and simultaneously obtains the internal pressure of the replaceable filter element filter absorber 1 in real time through the filter absorber pressure taking port 9.

[0054] Furthermore, the self-checking device 2 of the replaceable filter element filter absorber with self-checking function can be installed at a fixed position on the top cover 19, and the self-checking device 2 can be removed after the leakage coefficient test, and the filter absorber air inlet 5 and the filter absorber pressure port 9 can be blocked with an external thread plug, which does not affect the normal use of the filter absorber, thereby improving its flexibility in use.

[0055] Embodiment 2:

[0056] A method for replacing a filter element of a replaceable filter element filter absorber with a self-checking function comprises the following steps:

[0057] The first step is to determine the time to replace the filter element: when the replaceable filter element filter absorber with a self-checking function has been used for a period of time, a large amount of dust has accumulated on the fine filter element 34, or the gas filter element 28 is contaminated, moldy, or damaged, the gas filter element 28 needs to be replaced;

[0058] Step 2: Remove the old filter element: Under the premise of taking necessary personal protection measures, loosen the butterfly nut 20 on the top cover 19, remove the top cover 19, take out the gas filter element 28 or fine filter element 34 to be replaced, and seal it with a sealing bag;

[0059] Step 3: Check and clean: Check whether the top cover 19, the second bottom V-shaped seal ring 27, the first bottom V-shaped seal ring 31, the first top V-shaped seal ring 38 and the second top V-shaped seal ring 40 are damaged. If damaged, they should be replaced and the inside of the housing 21 should be cleaned;

[0060] Step 4, install the new filter element: glue the second bottom V-shaped sealing ring 27, the first bottom V-shaped sealing ring 31, the first top V-shaped sealing ring 38 and the second top V-shaped sealing ring 40 to the original installation position of the fine filter element 34 or the gas filter element 28, put the fine filter element 34 or the gas filter element 28 into the original position in the housing 21, cover the top cover 19, and tighten the butterfly nut 20.

[0061] Embodiment 3:

[0062] The air tightness self-checking method of the replaceable filter element filter absorber with self-checking function comprises the following steps:

[0063] The first step is sealing: cover and seal the filter absorber air inlet 7 and the filter absorber air outlet 22, connect the filter absorber air inlet 5 and the air inlet 11 with the air inlet pipe 4, and connect the filter absorber pressure port 9 and the pressure port 18 with the pressure taking pipe 10;

[0064] Step 2: Turn on the power of the self-test device 2 and turn it on;

[0065] The third step is to set the rated air volume: input the rated air volume A of the replaceable filter element filter absorber with self-test function on the display screen 15 of the self-test device 2;

[0066] Step 4, inflation: start the inflation pump 17 on the display screen 15 of the self-test device 2 to inflate the replaceable filter element filter absorber 1, and at the same time adjust the opening of the needle valve 12 to stabilize the internal pressure of the replaceable filter element filter absorber 1 at D and maintain T. At this time, the flow rate measured by the flow meter 13 is the leakage amount B;

[0067] The fifth step is to read the result. According to the formula: leakage coefficient C = (B / A) × 100%, the self-test device 2 automatically calculates the leakage coefficient and displays it on the display screen.

[0068] Embodiment 4:

[0069] The first step is sealing: cover and seal the filter absorber air inlet 7 and the filter absorber air outlet 22, connect the filter absorber air inlet 5 and the air inlet 11 with the air inlet pipe 4, and connect the filter absorber pressure port 9 and the pressure port 18 with the pressure taking pipe 10;

[0070] Step 2: Turn on the power of the self-test device 2 and turn it on;

[0071] The third step is to set the rated air volume: input the rated air volume A of the replaceable filter element filter absorber with self-test function on the display screen 15 of the self-test device 2;

[0072] Step 4, inflation: start the inflation pump 17 on the display screen and microcontroller 15 of the self-test device 2 to inflate the replaceable filter element filter absorber 1, and at the same time adjust the opening of the needle valve 12 to stabilize the internal pressure of the replaceable filter element filter absorber 1 at 2940Pa, and maintain it for 1 minute. At this time, the flow rate measured by the flow meter 13 is the leakage amount B;

[0073] The fifth step is to read the result. According to the formula: leakage coefficient C = (B / A) × 100%, the self-test device 2 automatically calculates the leakage coefficient and displays it on the display screen.

[0074] like Figure 4 As shown, the control principle of any replaceable filter element filter absorber with a self-test function is adopted, the power supply supplies power to the microcontroller, the microcontroller controls the start and stop and the speed of the inflation pump, the microcontroller collects signals from the flow meter and the pressure sensor, the pressure sensor collects the pressure signal in the replaceable filter element filter absorber, and after processing, the leakage coefficient self-test information is displayed on the display screen for human-computer interaction.

Claims

1. A replaceable filter element filter absorber with a self-checking function, comprising a replaceable filter element filter absorber (1), wherein a self-checking device (2) for detecting whether the replaceable filter element filter absorber (1) is fixedly mounted on the top of the replaceable filter element filter absorber (1); The replaceable filter element filter absorber (1) comprises a housing (21), an air outlet grille (26) and a filter absorber air outlet cylinder (22) are fixedly mounted on the bottom of the housing (21) via a steel ring (25), a top cover (19) is fixedly mounted on the top of the housing (21), a filter absorber air inlet cylinder (7) is arranged at the top center of the top cover (19), and a central cylinder (35), a fine filter element (34) and a gas filter element (28) are positioned and mounted in sequence from the center to the periphery between the air outlet grille (26) and the top cover (19); The top cover (19) is provided with a filter absorber air filling port (5) and a filter absorber pressure taking port (9), and the filter absorber air filling port (5) and the filter absorber pressure taking port (9) are both connected to an annular cavity surrounded by a fine filter element (34) and a gas filter element (28); the filter absorber air filling port (5) and the filter absorber pressure taking port (9) are connected to the self-test device (2) in a detachable manner; The bottom end of the central cylinder (35) is welded and fixed to the air outlet grille (26), and the top end is fixedly connected to the top cover (19) via a circular flange (36), and a first sealing ring (37) is provided on the joint end surface of the two. The bottom end of the fine filter element (34) is positioned and mounted on the upper end surface of the air outlet grille (26) via a first bottom positioning ring (33), and the top end is positioned and mounted on the lower end surface of the top cover (19) via a first top positioning ring (39); a first bottom V-shaped sealing ring (31) is provided at the contact end surface of the fine filter element (34) and the air outlet grille (26); a first top V-shaped sealing ring (38) is provided at the contact end surface of the fine filter element (34) and the top cover (19); and a first O-shaped sealing ring (32) is provided between the fine filter element (34) and the first bottom positioning ring (33); The bottom end of the gas filter element (28) is positioned and mounted on the upper end surface of the air outlet grille (26) via a second bottom positioning ring (30), and the top end is positioned and mounted on the lower end surface of the top cover (19) via a second top positioning ring (41); a second bottom V-shaped sealing ring (27) is provided at the contact end surface between the gas filter element (28) and the air outlet grille (26); a second top V-shaped sealing ring (40) is provided at the contact end surface between the gas filter element (28) and the top cover (19); a second O-shaped sealing ring (29) is provided between the gas filter element (28) and the second bottom positioning ring (30); The self-test device (2) comprises an air pump (17), the air inlet of the air pump (17) is connected to the atmosphere, the air outlet is connected to a tee, one end of the tee is connected to a flow meter (13), the other end of the flow meter (13) is connected to an air inlet (11), the air inlet (11) is connected to an air inlet (5) of a filter absorber via an air inlet pipe (4); the other end of the tee is connected to one end of a needle valve (12), the other end of the needle valve (12) is connected to the atmosphere; The filter absorber pressure port (9) is connected to the pressure port (18) of the pressure sensor (16) via a pressure pipe (10); the pressure sensor (16), the flow meter (13), and the air pump (17) are connected to a microcontroller (43); a display screen (15) is connected to the signal output end of the microcontroller (43); and the microcontroller (43) and the air pump (17) are both connected to a power source (14); The self-checking device (2) increases or reduces the pressure inside the replaceable filter element filter absorber (1) through the filter absorber inflation port (5), displays the flow rate in real time, and simultaneously obtains the internal pressure of the replaceable filter element filter absorber (1) in real time through the filter absorber pressure taking port (9).

2. According to claim 1, a replaceable filter element filter absorber with self-checking function, characterized in that: The top cover (19) is detachably mounted on the top of the housing (21) via a butterfly nut (20), and a second sealing ring (42) is provided between the top cover (19) and the housing (21); The self-checking device (2) is detachably mounted on the top of the replaceable filter element filter absorber (1) via a plurality of cross pan head screws (3).

3. The replaceable filter element filter absorber with self-checking function according to claim 1, characterized in that: An air outlet cover plate (24) is fixedly mounted on the bottom end of the filter absorber air outlet cylinder (22) via a butterfly nut, and an air outlet sealing gasket (23) is provided on the contact end surfaces of the air outlet cover plate (24) and the filter absorber air outlet cylinder (22).

4. The replaceable filter element filter absorber with self-checking function according to claim 1, characterized in that: An air inlet cover plate (6) is fixed to the top of the filter absorber air inlet cylinder (7), and an air inlet port is provided on the filter absorber air inlet cylinder (7).

5. The air tightness self-checking method of the replaceable filter element filter absorber with self-checking function according to any one of claims 1 to 4, characterized in that: It includes the following steps: The first step is sealing: the filter absorber air inlet tube (7) and the filter absorber air outlet tube (22) are covered and sealed, the filter absorber air inlet (5) and the air inlet (11) are connected with the air inlet tube (4), and the filter absorber pressure port (9) and the pressure port (18) are connected with the pressure taking tube (10); Step 2: Turn on the power: connect the power supply of the self-test device (2) and turn it on; Step 3: Setting the rated air volume: input the rated air volume A of the replaceable filter element filter absorber with self-test function on the display screen (15) of the self-test device (2); Step 4: Inflation: Start the air pump (17) on the display screen (15) of the self-test device (2) to inflate the replaceable filter element filter absorber (1), and at the same time adjust the opening of the needle valve (12) so that the internal pressure of the replaceable filter element filter absorber (1) is stabilized at D for a period of time T. At this time, the flow rate measured by the flow meter (13) is the leakage amount B; The fifth step is to read the result. According to the formula: leakage coefficient C = (B / A) × 100%, the self-test device (2) automatically calculates the leakage coefficient and displays it on the display screen.

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