Natural gas impurity filtering device

Abstract

The invention discloses a natural gas impurity filtering device, and relates to the technical field of impurity separation. Comprising a shell and a distance adjusting assembly, a top cover is installed at the top end of the shell through bolts, an air inlet pipe is installed at the left end of the shell, an air outlet pipe is installed at the right end of the shell, a connecting pipe is rotationally connected to the bottom of the top cover, and a pressing plate is slidably arranged on the surface of the connecting pipe in a limiting mode; a mounting frame is mounted at one end of the sliding table, a cleaning and collecting assembly is arranged in the mounting frame, and a rotating roller is rotationally connected into the mounting frame. The surface of the filter element can be cleaned in the natural gas filtering process, impurities can be effectively prevented from being accumulated in the filter element by cleaning the surface of the filter element in real time, the situation that the filter element is abraded due to long-time impurity impact is avoided, and meanwhile the blocking risk is reduced; and the cleaning and collecting assembly can clean impurities collected on the surface of the rotating roller.

Description

Technical Field

[0001] The present invention relates to the technical field of impurity separation, and specifically relates to a natural gas impurity filtering device. Background Art

[0002] Under the background of the accelerating transformation of the global energy structure towards cleaner energy, natural gas has become the "new favorite" in the energy field due to its significant advantages such as high combustion efficiency and low carbon emissions. During the extraction, transportation, and storage of natural gas, various impurities will inevitably be mixed in. Among them, solid impurities such as sediment and rust will cause serious wear to natural gas transmission pipelines and related equipment. Taking a long-distance gas transmission pipeline as an example, solid particles are carried by high-speed airflows and continuously impact the inner wall of the pipeline, resulting in a gradual thinning of the pipeline wall thickness, reducing the pressure-bearing capacity of the pipeline, and increasing the leakage risk. At the same time, these impurities may also block precision components such as valves and meters, affecting the normal operation of the equipment and the measurement accuracy. Therefore, it is necessary to filter the impurities in natural gas through a filtering device.

[0003] However, filtering natural gas for a long time may cause more impurities to accumulate on the surface of the filter element of the filtering device, thereby clogging the filter element. The clogging of the filter element will reduce the output of filtered natural gas. At this time, the continuous input gas will increase the pressure inside the filtering device, and excessive pressure may damage the filter element. The existing methods usually require regular disassembly, cleaning, or replacement of the filter element, which is not convenient for cleaning the surface of the filter element during the natural gas filtering process. Frequent disassembly, cleaning, or replacement of the filter element will increase the frequency and difficulty of maintenance work, thereby increasing the maintenance cost, and frequent disassembly and installation may also cause additional damage to the filter element and the equipment.

[0004] In view of the above problems, there is an urgent need for innovative design on the original basis. Summary of the Invention

[0005] The purpose of the present invention is to provide a natural gas impurity filtering device to solve the problems proposed in the above background art that filtering natural gas for a long time may cause more impurities to accumulate on the surface of the filter element, clogging the filter element and increasing the pressure inside the filtering device, and the existing methods are not convenient for cleaning the surface of the filter element during the natural gas filtering process.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A natural gas impurity filtering device, which includes a housing. The top of the housing is installed with a top cover through bolts. The left end of the housing is installed with an air inlet pipe, and the right end of the housing is installed with an air outlet pipe. The bottom of the top cover is rotatably connected with a connecting pipe. A pressing plate is limited and slid on the surface of the connecting pipe. A connecting frame is installed on the inner wall surface of the housing. A sliding table is limited and slid inside the connecting frame. One end of the sliding table is installed with a mounting frame. A cleaning and collecting assembly is arranged inside the mounting frame. A rotating roller is rotatably connected inside the mounting frame; Distance adjustment assembly. The distance adjustment assembly includes a toothed ring installed on the top surface of the connecting pipe, and also includes a gear installed at the bottom of the top cover. The toothed ring meshes with the gear. A rotating rod is installed at the bottom of the gear, and a sleeve is sleeved on the surface of the rotating rod. The sleeve is fixed on the pressing plate. An oil tank is installed inside the pressing plate, and a connecting rod is installed at the top of the pressing plate.

[0007] Preferably, a flow sensor is installed on the air outlet pipe. An air delivery pipe is installed inside the housing. The top end of the air delivery pipe is rotatably connected to a rotating ring. A filter element is sleeved on the surface of the rotating ring, and the top end of the filter element is sleeved on the surface of the connecting pipe.

[0008] Preferably, the side end of the air delivery pipe is connected to the inner wall of the housing, and the air delivery pipe is internally connected and communicated with the air outlet pipe.

[0009] Preferably, a metal plate is vertically installed at the bottom edge of the pressing plate. An electromagnet magnetically connected to the metal plate is installed at the side end of the housing. Both the electromagnet and the flow sensor are electrically connected to a controller installed on the housing.

[0010] Preferably, the sliding table is perpendicularly composed of three mutually parallel round rods and a vertical plate. The connecting frame is composed of an outer plate, four rods, and an inner plate. The outer plate and the inner plate are fixedly connected by four rods. The vertical plate is located between the outer plate and the inner plate. Springs are sleeved on the surfaces of the three round rods. The two ends of the springs sleeved on the surfaces of the round rods are respectively fixed to the vertical plate and the inner plate. The ends of the round rods penetrate through the holes on the inner plate and are connected to the outside of the mounting frame.

[0011] Preferably, spiral grooves are formed on the surface of the sleeve, and a convex block is installed at the bottom of the rotating rod. The convex block is limited to slide in the spiral grooves on the surface of the sleeve.

[0012] Preferably, two groups of oil cavities are formed inside the oil tank. A piston rod A slides in the upper oil cavity of the oil tank, and a piston rod B slides in the lower oil cavity of the oil tank. A pressing block is installed at the end of the piston rod B. An inclined surface is formed on the surface of the pressing block, and the surface of the pressing block abuts against the outside of the vertical plate of the sliding table.

[0013] Preferably, the number of connecting rods is three groups. The three groups of connecting rods are circumferentially distributed on the surface of the pressing plate. Springs are sleeved on the surfaces of the connecting rods, and the top ends of the connecting rods are limited to slide inside the top cover.

[0014] Preferably, the cleaning and collection assembly includes a long plate that is limited to slide in the inner cavity of the mounting frame. A convex platform is installed at one end of the long plate close to the rotating roller. An electric push rod is installed on one side of the mounting frame close to the connecting frame. The extending end of the electric push rod penetrates through the mounting frame and is connected to the end of the long plate far from the convex platform. A groove is formed in the inner cavity of the mounting frame, and a collection bin is vertically and slidably attached in the groove. The collection bin is in a "C" shape.

[0015] Preferably, the long plate and the convex platform are combined to form a scraping plate, and a chamfer is provided at the end of the convex platform.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: In the present invention, through the flow sensor, connecting frame, sliding table, mounting frame and roller provided, when the internal pressure of natural gas is detected to be too high, the surface of the filter element can be cleaned during the filtration of natural gas, preventing impurities from accumulating inside the filter element, reducing the wear and blockage of the filter element. Cleaning the surface of the filter element in real time can effectively prevent impurities from accumulating inside the filter element, avoid the wear of the filter element due to long-term impact of impurities, and at the same time reduce the risk of blockage, thereby maintaining the filtration efficiency and permeability of the filter element and ensuring the smooth flow of natural gas.

[0017] In the present invention, through the distance adjustment component provided, the distance and contact area between the roller and the filter element can be adjusted according to the pressure of natural gas inside the housing. When the pressure is relatively high, the roller will increase the contact area with the filter element. In the case of relatively high natural gas pressure, impurities are more likely to accumulate on the surface of the filter element. Therefore, a greater cleaning force is required. By increasing the contact area between the roller and the filter element, a stronger cleaning effect can be provided at high pressure to effectively remove impurities on the surface of the filter element. When the pressure is relatively low, appropriately reducing the contact area between the roller and the filter element can avoid the wear of the filter element caused by excessive cleaning.

[0018] In the present invention, through the cleaning and collection component provided, the impurities collected on the surface of the roller can be cleaned, preventing these impurities from gathering on the surface of the filter element again, thereby ensuring the cleanliness of the surface of the filter element and preventing the problem that impurities are not effectively collected and processed, resulting in their possible reattachment to the surface of the filter element, leading to secondary blockage of the filter element. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of one perspective of the present invention; Figure 2 is a schematic structural diagram of a cross-section of the present invention; Figure 3 is an exploded schematic structural diagram of a cross-section of the present invention; Figure 4 is the present invention Figure 3 an enlarged schematic structural diagram of part A in; Figure 5 is a schematic structural diagram of the inside of the oil tank of the present invention; Figure 6 is a schematic structural diagram of the top cover of the present invention; Figure 7 is the present invention Figure 6 an enlarged schematic structural diagram of part B in; Figure 8 is a schematic installation structure diagram of the connecting frame and the sliding table of the present invention; Figure 9 is an exploded schematic structural diagram of the connecting frame and the sliding table of the present invention Figure 10 Schematic cross-sectional structure diagram of the cleaning and collection component of the present invention; Figure 11 For the present invention Figure 10 Enlarged structure diagram at position C in Figure 12 Exploded structure diagram of the cleaning and collection component of the present invention and the sliding table; Figure 13 For the present invention Figure 12 Enlarged structure diagram at position D in

[0020] In the figure: 1, housing; 2, top cover; 3, intake pipe; 4, exhaust pipe; 5, flow sensor; 6, gas transmission pipe; 7, filter element; 8, connecting pipe; 9, pressing plate; 91, metal plate; 10, electromagnet; 11, connecting frame; 12, sliding table; 13, mounting frame; 141, toothed ring; 142, gear; 143, rotating rod; 144, sleeve; 145, oil tank; 146, piston rod A; 147, piston rod B; 148, pressing block; 149, connecting rod; 15, rotating roller; 161, long plate; 162, electric push rod; 163, collection bin; 164, convex platform. Detailed implementation manners

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0022] Please refer to Figures 1 - 13 , an embodiment of the present invention provides a natural gas impurity filtering device, including a housing 1, a top cover 2 is installed at the top end of the housing 1 through bolts, an intake pipe 3 is installed at the left end of the housing 1, an exhaust pipe 4 is installed at the right end of the housing 1, a connecting pipe 8 is rotatably connected to the bottom of the top cover 2, a pressing plate 9 is slidably limited on the surface of the connecting pipe 8, a connecting frame 11 is installed on the inner wall surface of the housing 1, a sliding table 12 is slidably limited inside the connecting frame 11, an installation frame 13 is installed at one end of the sliding table 12, a cleaning and collection component is arranged inside the installation frame 13, and a rotating roller 15 is rotatably connected inside the installation frame 13; Distance adjustment component, the distance adjustment component includes a toothed ring 141 installed on the top surface of the connecting pipe 8, and further includes a gear 142 installed at the bottom of the top cover 2, the toothed ring 141 is engaged with the gear 142, a rotating rod 143 is installed at the bottom of the gear 142, a sleeve 144 is sleeved on the surface of the rotating rod 143, the sleeve 144 is fixed on the pressing plate 9, an oil tank 145 is installed inside the pressing plate 9, and a connecting rod 149 is installed at the top of the pressing plate 9.

[0023] As an implementation manner of the present invention, a flow sensor 5 is installed on the air outlet pipe 4, and an air delivery pipe 6 is installed inside the housing 1. The top end of the air delivery pipe 6 is rotatably connected with a rotating ring, a filter element 7 is sleeved on the surface of the rotating ring, and the top end of the filter element 7 is sleeved on the surface of the connecting pipe 8. The side end of the air delivery pipe 6 is connected to the inner wall of the housing 1, and the air delivery pipe 6 is internally communicated with the air outlet pipe 4. The distance adjusting assembly can adjust the distance and contact area between the rotating roller 15 and the filter element 7 according to the pressure of natural gas inside the housing 1. When the pressure is relatively high, the contact area between the rotating roller 15 and the filter element 7 will be increased. When the pressure is relatively low, the contact area between the rotating roller 15 and the filter element 7 will be appropriately reduced to avoid wear of the filter element 7 caused by excessive cleaning. The flow sensor 5 can monitor the gas flow in the air outlet pipe 4.

[0024] As an implementation manner of the present invention, a metal plate 91 is vertically installed at the bottom edge of the pressing plate 9, and an electromagnet 10 magnetically connected to the metal plate 91 is installed on the side end of the housing 1. Both the electromagnet 10 and the flow sensor 5 are electrically connected to a controller installed on the housing 1, and the electromagnet 10 and the flow sensor 5 are controlled by the controller on the housing 1; the controller can control the adsorption or non-adsorption of the electromagnet 10 and the metal plate 91 according to the detection result of the flow sensor 5.

[0025] As an implementation manner of the present invention, the sliding table 12 is vertically combined by three mutually parallel round rods and a vertical plate. The connecting frame 11 is composed of an outer plate, four rods and an inner plate. The outer plate and the inner plate are fixedly connected through four rods. The vertical plate is located between the outer plate and the inner plate. Springs are sleeved on the surfaces of the three round rods, and the two ends of the springs sleeved on the surfaces of the round rods are respectively fixed to the vertical plate and the inner plate. The ends of the round rods penetrate through the holes on the inner plate and are connected to the outside of the mounting frame 13; when the sliding table 12 is limited and slides inside the connecting frame 11, the distance between the rotating roller 15 and the filter element 7 can be adjusted. The surface of the rotating roller 15 is made of silica gel, and the silica gel can preferably adsorb the impurities inside the filter element 7.

[0026] As an implementation manner of the present invention, spiral grooves are formed on the surface of the sleeve 144, and a convex block is installed at the bottom of the rotating rod 143. The convex block is limited and slides in the spiral grooves on the surface of the sleeve 144; when the pressing plate 9 drives the sleeve 144 to move up and down, the rotating rod 143 can be driven to rotate through the spiral grooves, and then the toothed ring 141 can be driven to rotate through the gear 142.

[0027] As an implementation manner of the present invention, two sets of oil chambers are provided inside the oil tank 145. A piston rod A 146 slides inside the upper oil chamber of the oil tank 145, and a piston rod B 147 slides inside the lower oil chamber of the oil tank 145. A pressing block 148 is installed at the end of the piston rod B 147. An inclined surface is provided on the surface of the pressing block 148. The surface of the pressing block 148 abuts against the outer side of the vertical plate of the sliding table 12. The inner diameter of the upper oil chamber inside the oil tank 145 is larger than the inner diameter of the lower oil chamber inside the oil tank 145; when the inclined surface of the pressing block 148 contacts the outer side of the vertical plate of the sliding table 12, the distance between the rotating roller 15 and the filter element 7 can be adjusted.

[0028] As an implementation manner of the present invention, the number of the connecting rods 149 is three. The three connecting rods 149 are distributed in a circular shape on the surface of the pressing plate 9. Springs are sleeved on the surfaces of the connecting rods 149. The bottom ends of the springs sleeved on the surfaces of the connecting rods 149 are connected to the pressing plate 9, and the top ends are connected to the bottom of the top cover 2. The top ends of the connecting rods 149 are limited and slide inside the top cover 2.

[0029] As an implementation manner of the present invention, the cleaning and collecting assembly includes a long plate 161 that is limited and slides inside the inner cavity of the mounting frame 13. A boss 164 is installed at one end of the long plate 161 close to the rotating roller 15. An electric push rod 162 is installed on one side of the mounting frame 13 close to the connecting frame 11. The extending end of the electric push rod 162 penetrates through the mounting frame 13 and is connected to the end of the long plate 161 far from the boss 164. A groove is provided in the inner cavity of the mounting frame 13. A collecting bin 163 is vertically and slidably attached inside the groove. The collecting bin 163 is in a "C" shape. The long plate 161 and the boss 164 are combined to form a scraping plate, and a chamfer is provided at the end of the boss 164.

[0030] Aiming at the problem that long-term filtration of natural gas may cause more impurities to accumulate on the surface of the filter element 7, resulting in blockage of the filter element 7 and an increase in the pressure inside the filtration device, and the existing method is not convenient for cleaning the surface of the filter element 7 during the filtration of natural gas, the natural gas impurity filtration device provided by the embodiment of the present invention can solve this problem, and the specific method is as follows: During use, natural gas enters the housing 1 through the intake pipe 3 at a fixed flow rate, and the natural gas is filtered by the filter element 7 to retain impurities in the natural gas on the surface of the filter element 7. The filtered natural gas enters the outlet pipe 4 through the delivery pipe 6. The flow sensor 5 detects the gas flow rate in the outlet pipe 4 in real time. When the flow sensor 5 detects that the gas flow rate in the outlet pipe 4 decreases (relative to when the filter element 7 was just replaced or just cleaned), it is determined that the pressure of the natural gas in the housing 1 increases. The controller controls the electromagnet 10 to be powered off, so that the electromagnet 10 no longer attracts the metal plate 91, thereby releasing the pressing plate 9. The internal pressure of the housing 1 squeezes the pressing plate 9 to move it upward. The pressing plate 9 drives the sleeve 144 to move upward. At this time, the convex block at the bottom of the rotating rod 143 slides in the spiral groove of the sleeve 144, and then drives the rotating rod 143 to rotate in the sleeve 144 through the convex block. The rotation of the rotating rod 143 drives the gear 142 to rotate. The gear 142 drives the connecting pipe 8 to rotate through the toothed ring 141, and the connecting pipe 8 drives the filter element 7 to rotate.

[0031] While the pressing plate 9 moves upward, the top cover 2 presses the piston rod A146. The oil in the upper oil cavity in the oil tank 145 is squeezed by the piston rod A146, and the oil in the upper oil cavity in the oil tank 145 is injected into the lower oil cavity. The oil in the lower oil cavity pushes the piston rod B147 to extend. The extension of the piston rod B147 will push the pressing block 148 to squeeze the vertical plate of the sliding table 12. The upper space of the piston rod A146 is connected to the lower space of the piston rod B147, and the lower space of the piston rod A146 is connected to the upper space of the piston rod B147. The round rod of the sliding table 12 drives the mounting frame 13 to move, so that the roller 15 contacts the filter element 7. The rotation of the filter element 7 drives the roller 15 to rotate, and the roller 15 adsorbs the impurities on the surface of the filter element 7. When the roller 15 rotates, the controller controls the electric push rod 162 to push the long plate 161 to extend. The convex block 164 at the end of the long plate 161 contacts the surface of the roller 15, and the scraper scrapes the impurities on the surface of the roller 15.

[0032] After the flow sensor 5 detects that the flow rate in the outlet pipe 4 is stable (the same as or similar to the flow rate when the filter element 7 was just replaced or just cleaned), the pressure of the natural gas in the housing 1 returns to normal. The spring on the surface of the connecting rod 149 makes the pressing plate 9 automatically reset. The controller controls the electromagnet 10 to adsorb the metal plate 91 at the bottom of the pressing plate 9. The reset of the pressing plate 9 pulls the piston rod A146, so that the oil inside the oil tank 145 drives the piston rod B147 to move upward. The piston rod B147 drives the pressing block 148 to move upward. The sliding table 12 loses the resistance of the pressing block 148, and the spring sleeved on the round rod rebounds to drive the sliding table 12 to automatically reset. After the roller 15 leaves the filter element 7, the extending end of the electric push rod 162 drives the scraper to retract. When the scraper retracts, the impurities on its surface fall into the collection bin 163 in the internal cavity of the mounting frame 13. When the collection bin 163 is taken out, its bottom contacts the convex block 164, and scrapes the impurities remaining on the convex block 164 into the collection bin 163, and is taken to the outside along with the collection bin 163.

[0033] When replacing the filter element 7, the controller controls the electromagnet 10 to cut off the power and release the pressing plate 9, removes the bolt from the surface of the top cover 2, then moves the top cover 2 upward and removes it from the top of the housing 1. Then, slide the filter element 7 upward on the surface of the swivel ring at the top of the air delivery pipe 6 to remove the filter element 7. Move the collection bin 163 upward and remove it from the inner cavity of the mounting bracket 13, clean the impurities in the collection bin 163. Then, sleeved the new filter element 7 on the surface of the swivel ring at the top of the air delivery pipe 6, insert the connecting pipe 8 at the bottom of the top cover 2 into the top of the filter element 7, make the pressing block 148 contact with the outer side of the vertical plate of the sliding table 12, energize the electromagnet 10 through the controller to adsorb the metal plate 91, and then fix the top cover 2 and the housing 1 with bolts.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "connected" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0035] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A natural gas impurity filtering device, characterized in that: It includes a housing (1), a top cover (2) is installed at the top end of the housing (1) through bolts, an air inlet pipe (3) is installed at the left end of the housing (1), an air outlet pipe (4) is installed at the right end of the housing (1), a connecting pipe (8) is rotatably connected to the bottom of the top cover (2), a pressing plate (9) is limited and slid on the surface of the connecting pipe (8), a connecting frame (11) is installed on the inner wall surface of the housing (1), a sliding table (12) is limited and slid inside the connecting frame (11), a mounting frame (13) is installed at one end of the sliding table (12), a cleaning and collecting assembly is arranged inside the mounting frame (13), and a rotating roller (15) is rotatably connected inside the mounting frame (13); A distance adjusting assembly, the distance adjusting assembly includes a toothed ring (141) installed on the top surface of the connecting pipe (8), and further includes a gear (142) installed at the bottom of the top cover (2), the toothed ring (141) is engaged with the gear (142), a rotating rod (143) is installed at the bottom of the gear (142), a sleeve (144) is sleeved on the surface of the rotating rod (143), the sleeve (144) is fixed on the pressing plate (9), an oil tank (145) is installed inside the pressing plate (9), and a connecting rod (149) is installed at the top of the pressing plate (9).

2. The natural gas impurity filtering device according to claim 1, wherein: A flow sensor (5) is installed on the air outlet pipe (4), an air delivery pipe (6) is installed inside the housing (1), a rotating ring is rotatably connected to the top end of the air delivery pipe (6), a filter element (7) is sleeved on the surface of the rotating ring, and the top end of the filter element (7) is sleeved on the surface of the connecting pipe (8).

3. The natural gas impurity filtering device according to claim 2, wherein: The side end of the air delivery pipe (6) is connected to the inner wall of the housing (1), and the air delivery pipe (6) is internally connected to the air outlet pipe (4).

4. The natural gas impurity filtering device according to claim 1, characterized in that: A metal plate (91) is vertically installed at the bottom edge of the pressing plate (9), an electromagnet (10) magnetically connected to the metal plate (91) is installed at the side end of the housing (1), and both the electromagnet (10) and the flow sensor (5) are electrically connected to a controller installed on the housing (1).

5. The natural gas impurity filtering device according to claim 1, characterized in that: The sliding table (12) is vertically combined by three mutually parallel round rods and a vertical plate. The connecting frame (11) is composed of an outer plate, four rods and an inner plate. The outer plate and the inner plate are fixedly connected by four rods. The vertical plate is located between the outer plate and the inner plate. Springs are sleeved on the surfaces of the three round rods. The two ends of the springs sleeved on the round rod surfaces are respectively fixed to the vertical plate and the inner plate. The ends of the round rods penetrate through the holes on the inner plate and are connected to the outside of the mounting frame (13).

6. The natural gas impurity filtering device according to claim 1, characterized in that: A spiral groove is formed on the surface of the sleeve (144), a convex block is installed at the bottom of the rotating rod (143), and the convex block is limited and slid in the spiral groove on the surface of the sleeve (144).

7. A natural gas impurity filtration device according to claim 5, characterized in that: Two groups of oil cavities are formed inside the oil tank (145). A piston rod A (146) slides in the upper oil cavity of the oil tank (145), a piston rod B (147) slides in the lower oil cavity of the oil tank (145), a pressing block (148) is installed at the end of the piston rod B (147), an inclined surface is formed on the surface of the pressing block (148), and the surface of the pressing block (148) abuts against the outside of the vertical plate of the sliding table (12).

8. A natural gas impurity filtration device according to claim 1, characterized in that: The number of the connecting rods (149) is three groups. The three groups of connecting rods (149) are circumferentially distributed on the surface of the pressing plate (9). Springs are sleeved on the surfaces of the connecting rods (149), and the top ends of the connecting rods (149) are limited and slid inside the top cover (2).

9. The natural gas impurity filtering device according to claim 1, wherein: The cleaning and collection assembly includes a long plate (161) that is limited and slides inside the inner cavity of the mounting frame (13). A boss (164) is installed at one end of the long plate (161) close to the roller (15). An electric push rod (162) is installed on one side of the mounting frame (13) close to the connecting frame (11). The extending end of the electric push rod (162) penetrates through the mounting frame (13) and is connected to the end of the long plate (161) away from the boss (164). A groove is formed in the inner cavity of the mounting frame (13), and a collection bin (163) is vertically and closely slidably fitted in the groove. The collection bin (163) is in a "C" shape.

10. A natural gas impurity filtration device according to claim 9, characterized in that: The long plate (161) and the boss (164) are combined to form a scraper, and a chamfer is provided at the end of the boss (164).

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