Natural gas filtering structure with self-replacement function

Abstract

The invention relates to a natural gas filtering structure with a self-replacement function applied to the field of separation equipment, the structure is provided with a plurality of filtering bins for replacement of the filtering structure, the filtering effect is effectively improved, the pressure difference at an air inlet and an air outlet is used for triggering automatic replacement action, a new filtering bin is used for replacing an old filtering bin, and the replacement efficiency is improved. The trouble and danger of manual replacement can be omitted, the efficient filtering effect on the natural gas can be effectively maintained, the natural gas is not leaked in the whole filtering process, the old filtering bins can be conveniently taken out to be cleaned, the maintenance frequency and times can be effectively reduced through the arrangement of the multiple filtering bins, and therefore the workload of maintenance personnel is relieved, and the maintenance efficiency is improved. In addition, the filtering bin can be detached for cleaning, the repeated utilization rate of the filtering structure is improved, and cost is effectively saved.

Description

Technical Field

[0001] The present invention relates to a natural gas filter structure with a self-replacement function, in particular to a natural gas filter structure with a self-replacement function applied in the field of separation equipment. Background Art

[0002] Natural gas filters are an indispensable device for conveying medium pipelines. They are usually installed at the inlet of pressure reducing valves, pressure relief valves, positioning valves or other equipment to remove impurities in the medium, protect the normal use of valves and equipment, and reduce equipment maintenance costs. Natural gas filters need regular maintenance to avoid internal blockage that affects the filtering effect. However, the maintenance of existing filters is troublesome, time-consuming and labor-intensive. In order to solve the problem of troublesome cleaning of natural gas filters, a filter in the market adopts a design of interchangeable directions of the inlet and outlet, which has a certain market share.

[0003] The specification of Chinese patent CN201310377914.5 discloses a stable natural gas filter. Compared with the existing filter, the bottom of the outer bottom of the filter cartridge of the present invention is a steel plate, and the direction of the air inlet and the air outlet of the filter are in a straight line. By exchanging the directions of the air inlet and the air outlet of the filter, the impurities removed by dust can adhere to the outside of the filter cartridge or settle on the steel plate at the bottom of the shell, so that the dust holding capacity of the filter is increased and can be discharged regularly through the sewage outlet, so that its operation is stable.

[0004] The specification of Chinese patent CN201410537002.4 discloses a natural gas filter. The invention effectively and reliably forms a redundant design with two filter mechanisms. The two filter mechanisms can not only filter clean natural gas at the same time, but also form a "spare tire" for each other, thereby ensuring the normal operation of the natural gas transmission pipeline, with high reliability and strong practicality. Although the above two inventions are designed by interchanging directions and adopting a "spare tire", they still have defects. The purpose of interchanging directions is to flush, but the actual flushing effect is limited after a long time. Although the "spare tire" can ensure the normal operation of the conveying pipeline, its structure is large and inconvenient to maintain. It is also very troublesome to disassemble one of them for maintenance. Summary of the invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is to realize automatic replacement of the filter structure.

[0006] In order to solve the above problems, the present invention provides a natural gas filtering structure with a self-replacement function, including a filter box, wherein the upper and lower ends of the filter box are respectively connected with an outlet pipe and an inlet pipe, and the outlet pipe and the inlet pipe are on the same vertical line, and a sealing box cover is installed on the upper side wall of the filter box relative to the outlet pipe, a driving motor is installed in the middle of the upper end of the filter box, and a driving shaft connected to the output end of the driving motor is installed inside the filter box, a telescopic shaft is slidably connected to the lower end of the driving shaft, and a plurality of equally spaced sliding grooves are opened on the side wall of the driving shaft, each sliding groove is slidably connected with a rotating hanger, and the transverse bracket of the rotating hanger is connected to the bottom of the sliding groove by a spring, and a filter bin is placed on each rotating hanger, and the side wall of the filter bin is fixedly connected with A magnetic plug is provided, and a slot which is engaged with the magnetic plug is provided on the side wall of the rotating hanger, the magnetic plug and the slot are magnetically attracted to each other, a filter cartridge is connected to the interior of the filter bin, an electric telescopic motor is installed in the middle of the lower end of the filter box, and an air blocking plug which is fixedly connected to the output end of the electric telescopic motor is sealed and slidably connected to the inner wall of the filter box, the lower end of the telescopic shaft is rotatably connected to the air blocking plug, the lower end of the air outlet pipe and the upper end side wall of the air blocking plug are both connected with a self-closing connecting sleeve, and the upper and lower ends of the filter bin are both inserted into the interior of the self-closing connecting sleeve and are connected with it, air pressure sensors are installed inside the air outlet pipe and the air inlet pipe, and a pressure difference monitoring module is electrically connected to the air pressure sensor, and the pressure difference monitoring module is electrically connected to the drive motor and the electric telescopic motor through the control processor.

[0007] In the above-mentioned natural gas filter structure with a self-replacement function, the gas pressure difference between the gas inlet and the gas outlet is used to automatically replace the filter structure, thereby eliminating the trouble of manual operation and making maintenance convenient and efficient.

[0008] As a further improvement of the present application, the self-closing connecting sleeve includes a sleeve, and the inner wall of the sleeve is fixedly connected with an elastic sealing ring, the side wall of the elastic sealing ring is fixedly connected with a plurality of air-blocking plates spliced ​​into a circle, and a closing plate gate is fixedly connected between the side wall of each air-blocking plate and the side wall of the sleeve. Under normal filtering state of natural gas, the filter bin rises under the drive of the air stagnation plug, and the upper and lower conical connecting heads both push the air-blocking plate, thereby opening the channel to connect the conical connecting head with the self-closing connecting sleeve, and when the filter bin is automatically replaced, the conical connecting head is out of contact with the upper and lower self-closing connecting sleeves, at this time, the elastic force of the closing plate gate resets the air-blocking plate to a horizontal state, and the plurality of air-blocking plates fit tightly to form a gate of a closed channel, thereby realizing the closure of the self-closing connecting sleeve, wherein the closing plate gate relies on elastic force to offset the impact force of the gas, so as to keep the air-blocking plate in a closed state.

[0009] As a further improvement of the present application, the air-blocking plate includes a fan-shaped plate body, and closing plate pads are fixedly connected to the two edges of the fan-shaped plate body. The fan-shaped plate body serves as a main body support to resist the impact of gas without deformation, and the closing plate pad is designed to allow two adjacent air-blocking plates to fit tightly without leaving any gaps, thereby achieving a better sealing effect.

[0010] As a further improvement of the present application, the closing plate gate includes an elastic seat, and the outside of the elastic seat is wrapped with a flexible protective film. The elastic seat is also fixedly connected to an elastic rod at the position of its maximum chord length. The elastic seat relies on elastic force to keep the air-blocking plate closed, and the elastic rod provides the elastic seat with a supporting force that can offset the impact force of the gas, so as to prevent the air-blocking plate from being loosely closed and causing natural gas leakage when replacing the filter bin.

[0011] As another improvement of the present application, the filter bin includes an upper bin body and a lower bin body which are threadedly connected, and the upper bin body and the lower bin body are both connected with a conical connecting head. The lower end of the filter cartridge is snap-fitted to the bottom of the lower bin body, and the interior of the filter cartridge is connected to the conical connecting head. The filter cartridge is installed inside the filter bin, so that natural gas will not leak into the interior of the filter box during the filtration process. This makes it convenient for workers to replace the filter bin, and the natural gas flows from the inside to the outside of the filter cartridge, which can play a good filtering role. Moreover, after separating the upper bin body and the lower bin body, the filter cartridge can be disassembled, cleaned and replaced, thereby realizing the reuse of the filter cartridge and effectively saving maintenance costs.

[0012] As another improved supplement of the present application, the filter cartridge includes a filter layer, and the upper and lower ends of the filter layer are respectively fixedly connected with an upper sealing cover and a bottom connecting cover, and the filter layer is composed of an outer metal filter material and an inner fiber filter material. Natural gas enters the interior of the filter cartridge and then flows out through the filter cartridge, so that impurities and droplets carried in the gas are trapped on the inner surface of the filter cartridge, and the filter layer made of composite materials can effectively filter the natural gas and can also be repeatedly cleaned and reused.

[0013] As another improvement supplement of the present application, a plurality of groups of symmetrically distributed stretch wires are fixedly connected between the upper cover and the bottom connecting cover, and an impact-resistant elastic bag is fixedly connected between each group of two stretch wires. The stretch wires and the impact-resistant elastic bag connect the upper and lower ends of the filter cartridge. Since the internal pressure of the natural gas pipeline is not stable during the gas transportation process, when the air pressure changes, it will cause local vibration of the filter cartridge, and the gas will also directly impact the upper cover. At this time, the impact-resistant elastic bag can offset part of the impact force of the gas by relying on elastic force, thereby effectively improving the stability of the filter cartridge.

[0014] As another improvement of the present application, the method for using the filtering structure includes the following steps: S1. First, place the filter box vertically, then connect the natural gas inlet pipe with the inlet pipe, and connect the natural gas outlet pipe with the outlet pipe. In the initial stage, the electric telescopic motor pushes the air blocking plug to connect the filter chamber with the upper and lower self-closing connecting sleeves. After the natural gas enters from the inlet pipe, it passes through the filter cartridge inside the filter chamber and goes out from the outlet pipe, thereby completing the filtration of the natural gas; S2. During the filtering process, the air pressure sensors in the air outlet pipe and the air inlet pipe monitor the air pressure at the air inlet and the air outlet in real time. Once the filter cartridge begins to be blocked, the gas pressure value at the air outlet pipe is bound to decrease. When the pressure difference monitoring module detects that the pressure difference between the air outlet pipe and the air inlet pipe exceeds the set threshold, the pressure difference monitoring module immediately triggers the drive motor and the electric telescopic motor through the control processor. At this stage, the electric telescopic motor first drives the air stagnation plug to move downward, so that the filter bin is disconnected from the self-closing connecting sleeve below. When the air stagnation plug descends, the rotating hanger drives the filter bin to disconnect from the self-closing connecting sleeve above under the resetting elastic force of the spring. In this way, the filter bin is out of contact with the upper and lower self-closing connecting sleeves, and the gas coming in from the air inlet pipe is temporarily stored in the space below the air stagnation plug. Then the drive motor drives the drive shaft to rotate, so that the new filter bin replaces the old filter bin, and then the electric telescopic motor drives the air stagnation plug to rise and reset, so that the new filter bin is reconnected with the upper and lower self-closing connecting sleeves, so that the filter bin can be automatically replaced; S3. When the replaced filter bin needs to be taken out for cleaning, open the sealed box cover and directly pull out the filter bin, then unscrew the upper and lower bin bodies, remove the filter cartridge from the lower bin body for cleaning, reinstall the new filter cartridge, and then assemble the upper and lower bin bodies. When installing the new filter bin, insert the filter bin back along the opening of the sealed box cover, and the magnetic plug realizes a firm connection between the filter bin and the rotating hanger.

[0015] To sum up, by setting up multiple filter chambers to replace the filter structure, the filtering effect is effectively improved, and the pressure difference at the inlet and outlet is used to trigger the automatic replacement action, so that the new filter chamber replaces the old filter chamber, which not only saves the trouble and danger of manual replacement, but also effectively maintains the efficient filtering effect of natural gas. During the entire filtration process, the natural gas will not leak, which makes it convenient to take out the old filter chamber for cleaning. The setting of multiple filter chambers can effectively reduce the frequency and number of maintenance, thereby reducing the workload of maintenance personnel. In addition, the filter chamber can be disassembled for cleaning, which improves the reuse rate of the filter structure and effectively saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a three-dimensional diagram of the filtering structure of the first embodiment of the present application; Figure 2 This is a three-dimensional cross-sectional view of the filter chamber in the first embodiment of the present application when in operation; Figure 3 This is a three-dimensional cross-sectional view of the filter bin during replacement according to the first embodiment of the present application; Figure 4 This is a schematic diagram of the installation of the filter bin according to the first embodiment of the present application; Figure 5 This is a schematic diagram of the connection between the filter bin and the rotating hanger in the first embodiment of the present application; Figure 6 A three-dimensional diagram of a self-closing connecting sleeve according to a first embodiment of the present application; Figure 7 A top view of a self-closing connecting sleeve according to a first embodiment of the present application; Figure 8 This is a cross-sectional view of the first embodiment of the present application when the filter bin is connected to the self-closing connecting sleeve; Fig. 9 This is a cross-sectional view of the filter bin and the self-closing connecting sleeve when the filter bin is separated from the self-closing connecting sleeve of the first embodiment of the present application; Fig.10 for Fig. 9 A magnified view of the structure at center A; Fig.11 This is a front cross-sectional view of the filter bin according to the second embodiment of the present application; Fig.12 This is a three-dimensional diagram of a filter cartridge according to a second embodiment of the present application; Fig.13 This is a front cross-sectional view of the filter cartridge according to the second embodiment of the present application.

[0017] Description of the numbers in the figure: 1 filter box, 2 air outlet pipe, 3 air inlet pipe, 4 sealing box cover, 5 drive motor, 6 drive shaft, 601 slide slot, 7 telescopic shaft, 8 rotating hanger, 801 slot, 9 filter bin, 901 upper bin body, 902 lower bin body, 903 conical connecting head, 10 filter cartridge, 1001 filter layer, 1002 upper cover, 1003 bottom connecting cover, 1004 impact-resistant elastic bag, 1005 stretching wire, 11 electric telescopic motor, 12 air stagnation plug, 13 self-closing connecting sleeve, 1301 pipe sleeve, 1302 elastic sealing ring, 1303 air-blocking plate, 13031 fan-shaped plate body, 13032 closing plate pad, 1304 closing plate gate, 13041 elastic seat, 13042 elastic rod, 14 magnetic plug. DETAILED DESCRIPTION

[0018] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0019] The first implementation method: Figure 1 , 2 , 3, 4 and Figure 5As shown, it includes a filter box 1, the upper and lower ends of the filter box 1 are respectively connected with an outlet pipe 2 and an inlet pipe 3, and the outlet pipe 2 and the inlet pipe 3 are on the same vertical line, and a sealing box cover 4 is installed on the upper side wall of the filter box 1 relative to the outlet pipe 2, and a driving motor 5 is installed in the middle of the upper end of the filter box 1 (the specific model is selected according to actual needs and is not described in detail here), and a driving shaft 6 connected to the output end of the driving motor 5 is installed inside the filter box 1, and a telescopic shaft 7 is slidably connected to the lower end of the driving shaft 6, and a plurality of equally spaced sliding grooves 601 are opened on the side wall of the driving shaft 6, and a rotating hanger 8 is slidably connected in each sliding groove 601, and the horizontal rotation of the rotating hanger 8 is The bracket is connected to the bottom of the slide groove 601 by a spring, and a filter bin 9 is placed on each rotating hanger 8. A magnetic plug 14 is fixedly connected to the side wall of the filter bin 9, and a slot 801 is provided on the side wall of the rotating hanger 8 to be engaged with the magnetic plug 14. The magnetic plug 14 and the slot 801 are magnetically attracted to each other. A filter cartridge 10 is connected to the inside of the filter bin 9, and an electric telescopic motor 11 (the specific model is selected according to actual needs and is not described in detail here) is installed in the middle of the lower end of the filter box 1, and an air stagnation plug 12 fixedly connected to the output end of the electric telescopic motor 11 is sealed and slidably connected to the inner wall of the filter box 1, and the lower end of the telescopic shaft 7 is rotatably connected to the air stagnation plug 12; Figure 6 , 7 As shown, the lower end of the air outlet pipe 2 and the upper end side wall of the air stagnation plug 12 are both connected with a self-closing connecting sleeve 13, the self-closing connecting sleeve 13 includes a sleeve 1301, and the inner wall of the sleeve 1301 is fixedly connected with an elastic sealing ring 1302 (preferably made of low-temperature resistant rubber material, and other materials can also be selected according to actual needs), the side wall of the elastic sealing ring 1302 is fixedly connected with a plurality of air-blocking plates 1303 spliced ​​into a circle, the air-blocking plate 1303 includes a fan-shaped plate body 13031, and the two sides of the fan-shaped plate body 13031 are fixedly connected with closing plate pads 13032 (preferably made of low-temperature resistant silicone material, and other materials can also be selected according to actual needs), the fan-shaped plate body 13031 plays the role of main body support, used to resist the impact of gas without deformation, the closing plate pad 13032 is to allow two adjacent air-blocking plates 1303 to fit tightly without leaving gaps, thereby achieving a better sealing effect; Figure 7 , 8 , 9 and Fig.10As shown, a closing plate gate 1304 is fixedly connected between the side wall of each air-blocking plate 1303 and the side wall of the pipe sleeve 1301, and the closing plate gate 1304 includes an elastic seat 13041, and the outside of the elastic seat 13041 is wrapped with a flexible protective film (preferably a low-temperature resistant rubber material, and other materials can also be selected according to actual needs), and the elastic seat 13041 is located at the position of its maximum chord length. Fixedly connected to the elastic rod 13042 (preferably a polyurethane elastic material, and can also be selected according to actual needs Other materials), the elastic seat 13041 relies on elastic force to keep the air-blocking plate 1303 closed, and the elastic rod 13042 provides the elastic seat 13041 with a supporting force that can offset the impact force of the gas, so as to prevent the air-blocking plate 1303 from being closed tightly and causing natural gas leakage when replacing the filter chamber 9. Under the normal filtering state of natural gas, the filter chamber 9 rises under the drive of the air stagnation plug 12, and the upper and lower conical connecting heads 903 push the air-blocking plate 1303, thereby opening the channel to allow the conical connecting head 903 to be connected with the self-closing connecting head 1303. The connecting sleeve 13 is connected, and when the filter bin 9 is automatically replaced, the conical connecting head 903 is out of contact with the upper and lower self-closing connecting sleeves 13. At this time, the elastic force of the closing plate gate 1304 resets the air-closing plate 1303 to make it horizontal, and multiple air-closing plates 1303 fit tightly to form a gate of a closed channel, thereby realizing the closure of the self-closing connecting sleeve 13, wherein the closing plate gate 1304 relies on elastic force to offset the impact force of the gas, so that the air-closing plate 1303 remains in a closed state, and the upper and lower ends of the filter bin 9 are inserted into the self-closing connecting sleeve 13 and connected thereto, and air pressure sensors are installed inside the air outlet pipe 2 and the air inlet pipe 3 (the specific model is selected according to actual needs and is not described in detail here), and the air pressure sensor is electrically connected to a pressure difference monitoring module, and the pressure difference monitoring module is electrically connected to the drive motor 5 and the electric telescopic motor 11 through the control processor (the specific connection structure and control principle between these modules are well-known technologies to technical personnel in the relevant field and are not described in detail here).

[0020] The second implementation method: Fig.11 As shown, the filter bin 9 includes an upper bin body 901 and a lower bin body 902 which are threadedly connected, and the upper bin body 901 and the lower bin body 902 are both connected with a conical connecting head 903, the lower end of the filter cartridge 10 is snap-fitted with the bottom of the lower bin body 902, and the interior of the filter cartridge 10 is connected with the conical connecting head 903, and the filter cartridge 10 is installed inside the filter bin 9, so that the natural gas will not leak into the inside of the filter box 1 during the filtering process, which is convenient for workers to replace the filter bin 9, and the natural gas flows from the inside of the filter cartridge 10 to the outside, which can play a good filtering role, and after separating the upper bin body 901 and the lower bin body 902, the filter cartridge 10 can be disassembled, cleaned and replaced, so as to realize the reuse of the filter cartridge 10 and effectively save maintenance costs; Fig.12 ,13 As shown, the filter cartridge 10 includes a filter layer 1001, and the upper and lower ends of the filter layer 1001 are fixedly connected with an upper cover 1002 and a bottom connecting cover 1003, respectively. The filter layer 1001 is composed of an outer metal filter material and an inner fiber filter material. Natural gas enters the interior of the filter cartridge 10 and then flows out through the filter cartridge 10, so that impurities and droplets carried in the gas are trapped on the inner surface of the filter cartridge 10. The filter layer 1001 made of a composite material can effectively filter the natural gas and can be repeatedly cleaned and reused. A plurality of groups of symmetrically distributed stretched wires are also fixedly connected between the upper cover 1002 and the bottom connecting cover 1003. 1005, and an impact-resistant elastic capsule 1004 (preferably made of low-temperature resistant rubber material, and other materials can also be selected according to actual needs) is fixedly connected between each group of two stretched wires 1005. The stretched wires 1005 and the impact-resistant elastic capsule 1004 connect the upper and lower ends of the filter cartridge 10. Since the internal pressure of the natural gas pipeline is not stable during the gas transportation process, when the gas pressure changes, it will cause local vibration of the filter cartridge 10, and the gas will also directly impact the upper cover 1002. At this time, the impact-resistant elastic capsule 1004 can offset part of the impact force of the gas by relying on elastic force, thereby effectively improving the stability of the filter cartridge 10; Figure 2 , 3 , 8 and Fig. 9 It is shown that the method of using the filtering structure includes the following steps: S1. First, the filter box 1 is placed vertically, and then the natural gas inlet pipe is connected to the inlet pipe 3, and the natural gas outlet pipe is connected to the outlet pipe 2. In the initial stage, the electric telescopic motor 11 pushes the air blocking plug 12 to connect the filter chamber 9 with the upper and lower self-closing connecting sleeves 13. After the natural gas enters from the inlet pipe 3, it passes through the filter cartridge 10 inside the filter chamber 9 and goes out from the outlet pipe 2, thereby completing the filtration of the natural gas; S2. During the filtering process, the air pressure sensors in the air outlet pipe 2 and the air inlet pipe 3 monitor the air pressure at the air inlet and outlet in real time. Once the filter cartridge 10 begins to be blocked, the gas pressure value at the air outlet pipe 2 is bound to decrease. When the pressure difference monitoring module detects that the pressure difference between the air outlet pipe 2 and the air inlet pipe 3 exceeds the set threshold, the pressure difference monitoring module immediately triggers the drive motor 5 and the electric telescopic motor 11 through the control processor. At this stage, the electric telescopic motor 11 first drives the air stagnation plug 12 to move downward, disconnecting the filter chamber 9 from the self-closing connecting sleeve 13 below, and the air stagnation plug 12 moves downward. At the same time, the rotating hanger 8 drives the filter bin 9 to be disconnected from the upper self-closing connecting sleeve 13 under the resetting elastic force of the spring, so that the filter bin 9 is out of contact with the upper and lower self-closing connecting sleeves 13, and the gas coming in from the air inlet pipe 3 is temporarily stored in the space below the air stagnation plug 12. Then the driving motor 5 drives the driving shaft 6 to rotate, so that the new filter bin 9 replaces the old filter bin 9, and then the electric telescopic motor 11 drives the air stagnation plug 12 to rise and reset, so that the new filter bin 9 is connected with the upper and lower self-closing connecting sleeves 13 again, so that the automatic replacement of the filter bin 9 can be realized; S3. When the replaced filter bin 9 needs to be taken out for cleaning, open the sealed box cover 4 and directly pull out the filter bin 9, then unscrew the upper bin body 901 and the lower bin body 902, remove the filter cartridge 10 from the lower bin body 902 for cleaning, reinstall the new filter cartridge 10, and then assemble the upper bin body 901 and the lower bin body 902. When installing the new filter bin 9, insert the filter bin 9 back along the opening of the sealed box cover 4, and the magnetic plug 14 realizes a firm connection between the filter bin 9 and the rotating hanger 8.

[0021] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A natural gas filter structure with a self-replacement function, characterized in that: The filter box (1) comprises a filter box (1), wherein the upper and lower ends of the filter box (1) are respectively connected to an air outlet pipe (2) and an air inlet pipe (3), and the air outlet pipe (2) and the air inlet pipe (3) are on the same vertical line. The filter box (1) is provided with a sealing box cover (4) on the upper side wall opposite to the air outlet pipe (2). A driving motor (5) is provided at the middle of the upper end of the filter box (1), and a driving shaft (6) connected to the output end of the driving motor (5) is provided inside the filter box (1). The driving shaft (6) The lower end of the drive shaft (6) is slidably connected to a telescopic shaft (7), and the side wall of the drive shaft (6) is provided with a plurality of equally spaced and surrounding sliding grooves (601), each of the sliding grooves (601) is slidably connected to a rotating hanger (8), and a transverse support of the rotating hanger (8) is connected to the bottom of the sliding groove (601) via a spring, and a filter bin (9) is placed on each of the rotating hangers (8), and a magnetic plug (14) is fixedly connected to the side wall of the filter bin (9), and the side of the rotating hanger (8) is provided with a magnetic plug (14). A slot (801) is provided on the wall thereof and is engaged with a magnetic plug (14); the magnetic plug (14) and the slot (801) are magnetically attracted to each other; a filter cartridge (10) is connected to the interior of the filter bin (9); an electric telescopic motor (11) is installed at the middle of the lower end of the filter box (1); an air blocking plug (12) fixedly connected to the output end of the electric telescopic motor (11) is sealingly and slidably connected to the inner wall of the filter box (1); the lower end of the telescopic shaft (7) is rotatably connected to the air blocking plug (12) The lower end of the air outlet pipe (2) and the upper side wall of the air stagnation plug (12) are both connected to a self-closing connecting sleeve (13), and the upper and lower ends of the filter chamber (9) are inserted into the interior of the self-closing connecting sleeve (13) and are connected thereto. Air pressure sensors are installed inside the air outlet pipe (2) and the air inlet pipe (3), and a pressure difference monitoring module is electrically connected to the air pressure sensor. The pressure difference monitoring module is electrically connected to the drive motor (5) and the electric telescopic motor (11) through a control processor.

2. A natural gas filter structure with self-replacement function according to claim 1, characterized in that: The self-closing connecting sleeve (13) comprises a sleeve (1301), and the inner wall of the sleeve (1301) is fixedly connected to an elastic sealing ring (1302), the side wall of the elastic sealing ring (1302) is fixedly connected to a plurality of air-sealing plates (1303) spliced ​​into a circle, and a closing plate gate (1304) is fixedly connected between the side wall of each air-sealing plate (1303) and the side wall of the sleeve (1301).

3. A natural gas filter structure with self-replacement function according to claim 2, characterized in that: The air-blocking plate (1303) comprises a fan-shaped plate body (13031), and two sides of the fan-shaped plate body (13031) are fixedly connected with a closing plate pad (13032).

4. The natural gas filter structure with self-replacement function according to claim 2, characterized in that: The closed plate gate (1304) comprises an elastic seat (13041), and the outside of the elastic seat (13041) is wrapped with a flexible protective film, and the elastic seat (13041) is also fixedly connected to an elastic rod (13042) at the position of the maximum chord length.

5. The natural gas filter structure with self-replacement function according to claim 1, characterized in that: The filter bin (9) comprises an upper bin body (901) and a lower bin body (902) which are threadedly connected, and the upper bin body (901) and the lower bin body (902) are both connected with a conical connecting head (903), the lower end of the filter cartridge (10) is clamped with the bottom of the lower bin body (902), and the interior of the filter cartridge (10) is connected with the conical connecting head (903).

6. The natural gas filter structure with self-replacement function according to claim 1, characterized in that: The filter cartridge (10) comprises a filter layer (1001), and the upper and lower ends of the filter layer (1001) are respectively fixedly connected with an upper cover (1002) and a bottom connecting cover (1003), and the filter layer (1001) is composed of an outer layer of metal filter material and an inner layer of fiber filter material.

7. A natural gas filter structure with self-replacement function according to claim 6, characterized in that: A plurality of groups of symmetrically distributed stretching threads (1005) are also fixedly connected between the upper cover (1002) and the bottom connecting cover (1003), and an anti-impact elastic bag (1004) is fixedly connected between two stretching threads (1005) in each group.

8. A natural gas filter structure with self-replacement function according to claims 1-7, characterized in that: The method for using the filtering structure comprises the following steps: S1. First, the filter box (1) is placed vertically, and then the natural gas inlet pipe is connected to the inlet pipe (3), and the natural gas outlet pipe is connected to the outlet pipe (2). In the initial stage, the electric telescopic motor (11) pushes the air blocking plug (12) to connect the filter chamber (9) with the upper and lower self-closing connecting sleeves (13). After the natural gas enters through the inlet pipe (3), it passes through the filter cartridge (10) inside the filter chamber (9) and exits from the outlet pipe (2), thereby completing the filtration of the natural gas. S2. During the filtering process, the air pressure sensors in the air outlet pipe (2) and the air inlet pipe (3) monitor the air pressure at the air inlet and the air outlet in real time. Once the filter cartridge (10) begins to become clogged, the gas pressure value at the air outlet pipe (2) is bound to decrease. When the pressure difference monitoring module detects that the pressure difference between the air outlet pipe (2) and the air inlet pipe (3) exceeds a set threshold value, the pressure difference monitoring module immediately triggers the drive motor (5) and the electric telescopic motor (11) through the control processor. At this stage, the electric telescopic motor (11) first drives the air stagnation plug (12) to move downward, disconnecting the filter chamber (9) from the self-closing connecting sleeve (13) below. At the same time, the air stagnation plug (12) descends. When the rotating hanger (8) is rotated, the filter bin (9) is driven to disconnect from the upper self-closing connecting sleeve (13) under the resetting elastic force of the spring, so that the filter bin (9) is disconnected from the upper and lower self-closing connecting sleeves (13), and the gas entering from the air inlet pipe (3) is temporarily stored in the space below the air stagnation plug (12). Then, the driving motor (5) drives the driving shaft (6) to rotate, so that the new filter bin (9) replaces the old filter bin (9), and then the electric telescopic motor (11) drives the air stagnation plug (12) to rise and reset, so that the new filter bin (9) is connected to the upper and lower self-closing connecting sleeves (13) again, so that the automatic replacement of the filter bin (9) can be realized; S3. When it is necessary to remove the replaced filter bin (9) for cleaning, open the sealed box cover (4) and directly pull out the filter bin (9), then unscrew the upper bin body (901) and the lower bin body (902), remove the filter cartridge (10) from the lower bin body (902) for cleaning, reinstall the new filter cartridge (10), and then assemble the upper bin body (901) and the lower bin body (902). When installing the new filter bin (9), insert the filter bin (9) back along the opening of the sealed box cover (4), and the magnetic plug (14) realizes a stable connection between the filter bin (9) and the rotating hanger (8).

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