Preposed filter of PE (Poly Ethylene) valve for anti-corrosion directly-buried gas pipeline

Abstract

The invention relates to a PE valve preposed filter for a corrosion-free directly-buried gas pipeline, which comprises a body, the interior of the body is provided with a purification channel, the two ends of the purification channel respectively penetrate through the surface of the body to form a medium inlet and a medium outlet, the body comprises a detachable inlet flange elbow, the surface of the inlet flange elbow is provided with a cleaning port, and the cleaning port is communicated with the purification channel; the filter element is arranged in the purification channel and is opposite to the inlet flange elbow, and the filter surface of the filter element is opposite to the medium inlet; the cleaning assembly is movably mounted in the cleaning opening, extends into the purification channel, is connected with the filter element and is used for cleaning the filter element; the vertical pipe is arranged on the surface of the body relative to the cleaning opening and penetrates upwards to the ground surface. According to the technical scheme, the overall sealing performance is good, the inner filter element is stably positioned, the impact of a high-flow-speed gas medium can be dealt with, meanwhile, cleaning of the filter element is not affected by the buried working condition, disassembly and maintenance are convenient, and then the filter element is matched with a gas pipe network system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of filtration, more particularly to a PE valve pre-filter for direct-buried gas pipelines without corrosion protection. BACKGROUND

[0002] PE ball valves are plastic valves made of polyethylene, widely used in modern gas pipeline systems, and are usually installed underground. The valve core is a rotating ball with a hole, which can be quickly opened and closed by rotating 90 degrees. The chemical inertness and electrical insulation of polyethylene make PE ball valves perfectly suitable for harsh conditions of gas transportation.

[0003] During long-term operation, the connection between new and old pipelines (especially metal pipelines) and the particulate impurities contained in the transported medium will accumulate in the sealing joint of the ball valve over the years. When the valve core rotates to open and close, it will scratch the sealing joint, eventually leading to sealing failure and internal leakage.

[0004] To solve the problem of internal leakage caused by sealing failure of PE ball valves, a filter can be added at the front end of the valve to continuously intercept particulate impurities in the medium, effectively reducing the wear of the sealing surface, thereby improving the sealing reliability and ensuring the smoothness and safety of the pipeline system. However, the current pre-filter is mainly used in household water supply systems, laboratory equipment, and other small devices. For example, the pre-filter with a ball valve stem disclosed in Chinese Patent No. CN115738464A is suitable for the front end of household pipelines or small devices such as water heaters, dishwashers, and water heaters. It includes a housing, one end of the housing is connected to a valve body, the valve body is provided with a connection end for fluid inlet and outlet, a valve cavity is formed in the valve body, a valve core is arranged in the valve cavity, and a water outlet and a water return are arranged on the valve core. The valve core also includes a rotating shaft, and there is a solid part in the valve cavity. The solid part is provided with an inlet groove, which is in communication with the water inlet end. The valve cavity is in communication with the water outlet end. The rotating shaft extends outside the valve body and is connected to a rotating sleeve. The housing is provided with a filter element, the open end is connected to the valve body and is in communication with the water return. The housing is connected to the valve body at one end. A blowdown valve is connected to the housing. The operator can switch the working mode of the filter by rotating the rotating sleeve. The working modes include filtration mode and blowdown mode. In filtration mode, impurities wrapped in the fluid move to the closed end of the filter element under the scouring of the fluid, and gradually accumulate in the housing segment other than the valve body. In blowdown mode, the water return is blocked, and all fluid is scoured out of the blowdown valve.

[0005] The current conventional pre-filter represented by the above pre-filter can easily cause the filtration function to fail in high-flow-rate gas media and underground corrosive environments, and the buried application scenario will face the following problems:

[0006] ① Body buried will lead to spin sleeve operation function failure, mode switching is blocked, resulting in filter dirt accumulation and significantly shorten the maintenance cycle;

[0007] ② Limited to compact structure, and the underground installation environment aggravates the complexity of filter screen maintenance operation, and the conventional disassembly and assembly method cannot cope with the soil working condition.

[0008] Therefore, the current pre-filter is difficult to adapt to the gas pipe network system. SUMMARY

[0009] In view of the above situation, in order to overcome the above-mentioned problems that the existing pre-filter is easy to cause the failure of the filtering function in the high flow rate of the gas medium and the underground corrosion environment, and the mode switching is blocked in the buried working condition, and the maintenance operation of the filter screen is greatly increased in complexity, the purpose of the present application is to provide a PE valve pre-filter for corrosion-free direct-buried gas pipeline, which has good overall sealing, stable positioning of the internal filter element, can cope with the impact of high flow rate of gas medium, and the cleaning of the filter element is not affected by the buried working condition, and is convenient to disassemble and maintain, thereby adapting to the PE valve pre-filter for corrosion-free direct-buried gas pipeline.

[0010] In order to achieve the above-mentioned purpose, the technical solution of the present application is:

[0011] A PE valve pre-filter for corrosion-free direct-buried gas pipeline, comprising:

[0012] The body has a purification channel inside, the two ends of the purification channel penetrate the surface of the body to form a medium inlet and a medium outlet, and the body includes a detachable inlet flange elbow, the surface of the inlet flange elbow has a cleaning port, and the cleaning port is in communication with the purification channel;

[0013] The filter element is arranged in the purification channel, the filter element is opposite to the inlet flange elbow, and the filter surface is opposite to the medium inlet;

[0014] The cleaning assembly is movably installed in the cleaning port and extends into the purification channel to connect with the filter element, and is used for cleaning the filter element;

[0015] The stand pipe is arranged on the surface of the body opposite to the cleaning port and penetrates upward to the ground surface.

[0016] As a preferred, the body has a diffusion channel inside, one end of the diffusion channel is in communication with the bottom of the purification channel, the other end penetrates the surface of the body and is connected with a diffusion valve, and the filter element is located between the medium inlet and the diffusion channel.

[0017] As a preferred, the body further comprises:

[0018] The sediment well has an end pipe and an end pipe, the inlet of the end pipe is the medium inlet, the end pipe is close to the bottom of the sediment well, the filter element is located between the end pipe and the end pipe, and the wellhead of the sediment well is connected with the inlet flange elbow.

[0019] The outlet flange elbow is connected with the inlet flange elbow, and the outlet flange elbow is provided with a clearance opening;

[0020] The tee pipe has an upper pipe body, a lower pipe body and a branch pipe body. The upper pipe body is connected with the outlet flange elbow, the outlet of the branch pipe body serves as a medium outlet, and the lower pipe body is provided with a mounting opening. The end pipe penetrates through the mounting opening to the inside of the lower pipe body.

[0021] The diffusion pipe group is arranged in the tee pipe and the outlet flange elbow, is connected with the end pipe, penetrates through the clearance opening to the outside, and is connected with the diffusion valve.

[0022] Preferably, the diffusion pipe group comprises:

[0023] The electric melting elbow is connected with the end pipe.

[0024] The first sealing reducing pipe is sealingly connected with the electric melting elbow. The lower pipe body is formed with a sealing plate. The sealing plate is formed with a first connecting pipe. The first sealing reducing pipe is fixedly connected with the first connecting pipe.

[0025] The central pipe is sealingly connected with the first sealing reducing pipe through the first connecting pipe. The outer periphery of the clearance opening is formed with a second connecting pipe. The central pipe further penetrates through the second connecting pipe to the outside.

[0026] The second sealing reducing pipe is sleeved with the second connecting pipe and sealingly connected with the central pipe. The diffusion valve is arranged in the central pipe.

[0027] Preferably, the outer wall of the sediment well is formed with a positioning pipe. The outer wall of the tee pipe is formed with a positioning shaft extending in the opposite direction. The positioning shaft is insertedly connected with the positioning pipe.

[0028] Preferably, the number of the sediment wells is multiple. The body further comprises a collecting pipe. The collecting pipe comprises:

[0029] A main pipe body;

[0030] A primary branch pipe is equal in number to the sediment wells and is arranged in the axial direction of the main pipe body. The primary branch pipe is connected with the end pipe of the corresponding sediment well.

[0031] A secondary branch pipe is connected with the diffusion pipe group through the end pipe.

[0032] Preferably, the filter core is rotationally connected with the purification channel. The cleaning assembly comprises:

[0033] A brush is arranged on one side of the filter core and close to the filter surface of the filter core.

[0034] A support is connected with the brush and fixed in the purification channel.

[0035] A rotating shaft is connected with the filter core and penetrates through the cleaning opening and is connected with a rotating square head.

[0036] Preferably, the filter core outer edge is formed with a support framework, the inner wall of the purification channel is correspondingly provided with a clamping groove, the support framework is embedded in the clamping groove and is in clearance fit with the clamping groove, and a sealing ring is arranged between the clamping groove and the support framework.

[0037] Preferably, the filter core is internally provided with at least one of a molecular sieve, activated carbon and activated alumina.

[0038] Preferably, the upper end of the vertical pipe is provided with an openable well lid.

[0039] Compared with the prior art, the present application has the following advantages:

[0040] ①The filter core is arranged in the purification channel of the body and is opposite to the flow direction of the gas, the impact kinetic energy of the high-speed gas is converted into static pressure, a stable laminar flow region is formed at the filter surface, flow disturbance is significantly reduced, and the filter core is stably kept in the purification channel

[0041] ②The cleaning port is axially aligned with the inner pipe section of the vertical pipe, the lower end of the vertical pipe is connected with the surface of the body, the upper end penetrates upward to the ground surface, the inner pipe section of the vertical pipe serves as an operation channel penetrating the underground and the ground surface, the operation end of the cleaning assembly is exposed to the operation interface on the ground surface, and the ground operation personnel can directly control the underground cleaning assembly.

[0042] ③The body comprises an inlet flange elbow, flange interfaces are formed at the two ends of the inlet flange elbow, the standardized flange interfaces are connected with other parts of the body, the sealing reliability under the buried working condition and the impact of high-speed gas medium is ensured, the flange connection at the two ends of the inlet flange elbow is released, the inlet flange elbow can be detached from the other parts of the body connected therewith, the internal space of the body is exposed, and the filter core can be conveniently detached, replaced and directly cleaned. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 is the overall structure schematic diagram of the filter of the present application;

[0044] Figure 2 is the enlarged structure schematic diagram of A part of the present application Figure 1 ;

[0045] Figure 3 is the overall structure schematic diagram of the inlet flange elbow of the filter body and the filter core after being detached of the present application;

[0046] Figure 4 is the exploded structure schematic diagram of the filter of the present application;

[0047] Figure 5 is the overall structure schematic diagram of the sediment well of the filter body of the present application;

[0048] Figure 6is the overall structure schematic diagram of the inlet flange elbow of the filter body of the present application;

[0049] Figure 7 is the overall structure schematic diagram of the outlet flange elbow of the filter body of the present application;

[0050] Figure 8 is the overall structure schematic diagram of the tee pipe of the filter body of the present application;

[0051] Figure 9 is the overall structure schematic diagram of the diffusion pipe group of the filter body of the present application provided with a diffusion valve;

[0052] Figure 10 is the overall structure schematic diagram of the filter core connected with the cleaning assembly of the present application;

[0053] Figure 11 is the overall structure schematic diagram of the filter in the overhead state when multiple sedimentation wells are connected with the manifold pipe.

[0054] As shown in the figure:

[0055] 100, body; 100a, purification channel; 100b, medium inlet; 100c, medium outlet; 100d, diffusion channel; 100e, clamping groove; 11, inlet flange elbow; 111, cleaning port; 12, sedimentation well; 121, end pipe; 122, drain pipe; 123, positioning pipe; 13, outlet flange elbow; 131, avoiding port; 132, second butt joint pipe; 14, tee pipe; 141, upper pipe body; 142, lower pipe body; 142a, mounting port; 142b, sealing plate; 142c, first butt joint pipe; 143, branch pipe body; 144, positioning shaft; 15, diffusion pipe group; 151, electric melting elbow; 152, first sealing reducing pipe; 153, center pipe; 154, second sealing reducing pipe; 16, manifold pipe; 161, main pipe body; 162, primary branch pipe; 163, secondary branch pipe; 200, filter core; 21, support framework; 300, cleaning assembly; 31, brush; 32, support; 33, rotating shaft; 331, rotating square head; 400, vertical pipe; 500, diffusion valve; 600, sealing ring; 700, well lid. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical scheme and advantages of the present application more clear, the technical scheme of the present application and how the technical scheme of the present application solves the above technical problems will be described clearly and completely below with specific examples and in combination with the drawings in the present application. Obviously, the described examples are part of the examples of the present application, but not all the examples. Based on the examples in the present application, all the other examples obtained by those skilled in the art without making creative efforts fall within the scope of protection of the present application.

[0057] In the description of the application, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "linking" should be understood in a broad sense, for example, it can be fixed connection, or indirect connection through intermediate medium, or internal communication of two elements or interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0058] In the description of the application, it is necessary to understand that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the application.

[0059] The terms "first", "second", "third", "fourth" and the like in the specification and claims of the application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily have to describe a particular order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein.

[0060] In the embodiments of the application, the words "exemplary" or "for example" are used to mean example, instance, or illustration. Any embodiment or design scheme described as "exemplary" or "for example" in the application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the use of "exemplary" or "for example" is intended to present the relevant concept in a specific manner.

[0061] As the background art, PE ball valves are widely configured in modern gas pipeline systems, and are generally installed in a buried manner. In long-term operation, particles contained in the connecting part of new and old pipelines (especially metal pipelines) and the conveying medium are deposited in the sealing joint of the ball valve over the years. When the valve core rotates to open and close, the sealing joint will be scratched, eventually leading to sealing failure and internal leakage. However, the front filter is mainly used in household water supply systems, laboratory equipment and other small devices. If it is configured in a gas pipeline system, it must be installed in a buried manner. In a high-flow gas medium and underground corrosion environment, it is easy to cause the filter function to fail. The overall buried installation will also cause the manual operation function to fail, causing a large amount of dirt to accumulate on the filter element 200, greatly shortening the maintenance cycle. At the same time, due to the compact structure, and the underground installation environment increases the complexity of filter screen maintenance operation. The conventional disassembly and assembly method cannot cope with the soil working condition, so the current front filter is difficult to adapt to the gas pipeline system.

[0062] As shown in Figure 1 , Figure 3 and Figure 4 , based on this, the application provides a PE valve front filter for non-corrosion direct-buried gas pipeline, which comprises a body 100, a filter element 200, a cleaning assembly 300 and a stand pipe 400;

[0063] As shown in Figure 1 , Figure 3 and Figure 4 , the body 100 is the body 100 of the front filter, which refers to the part excluding the filter element 200, the cleaning assembly 300, the stand pipe 400 and other components attached to the body 100. The body 100 comprises an inlet flange elbow 11, and the two ends of the inlet flange elbow 11 are formed with flange interfaces. The inlet flange elbow 11 is connected to other parts of the body 100 through standardized flange interfaces to ensure the sealing reliability under buried working conditions and high-speed gas medium impact. The flange connection at both ends of the inlet flange elbow 11 is released, so that it can be detached from other parts of the body 100 connected thereto to expose the internal space of the body 100, facilitating maintenance and cleaning operations;

[0064] As shown in Figure 1As shown, the body 100 has a purification channel 100a inside, the inner pipe section of the inlet flange elbow 11 also serves as a part of the purification channel 100a, the front and rear ends of the purification channel 100a respectively penetrate the surface of the body 100, and respectively form a medium inlet 100b and a medium outlet 100c on the surface of the body 100, the body 100 is integrated in the gas pipeline upstream of the PE ball valve, the dusty gas medium is input into the inside of the body 100 at the medium inlet 100b, flows along the preset purification flow channel, filters out the contained particulate impurities in the purification channel 100a, and finally outputs clean gas from the outlet, in addition, the surface of the inlet flange elbow 11 has a cleaning port 111, the cleaning port 111 communicates with the purification channel 100a, and then facilitates the cleaning operation in the purification channel 100a;

[0065] As Figure 3 shown, the filter element 200 is fixedly installed inside the purification channel 100a relative to the inlet flange elbow 11, when the inlet flange elbow 11 is disassembled, the corresponding installation position of the body 100 forms a through-type maintenance window, the purification channel 100a communicates with the external space through the window, at this time the filter element 200 will be completely exposed to the external field of view, thereby facilitating the disassembly and assembly of the filter element 200, it needs to be mentioned that at the position of the medium outlet 100c of the body 100, a detection device such as an electronic flowmeter can be added, and the operator can evaluate the use (blockage) degree of the filter element 200 based on the clean gas flow monitoring data fed back by the detection device, when the clean gas flow is reduced below the critical value, the filter element 200 needs to be disassembled for direct cleaning or replacement;

[0066] As Figure 1As shown, the filter surface of filter element 200 is densely covered with filter pores. The filter surface is located on the axial extension line of the medium inlet 100b, thus directly opposite the medium inlet 100b. The filter surface of filter element 200 completely covers the flow section of the medium inlet 100b. After the dust-laden gas medium is input through the medium inlet 100b, it will be filtered by filter element 200, thereby effectively intercepting solid particulate impurities contained in the medium. The filter element 200 assembly should be fixedly installed relative to the purification channel 100a in the axial direction. The filter element 200 forms an axial positioning fit with the support structure in the purification channel 100a through its central axis, while allowing the filter element 200 to rotate around the central axis. In addition, the filter element 200 can be installed in the purification channel through multiple positioning points. In channel 100a, if an annular positioning flange is formed on the outer periphery of filter element 200 and a corresponding shoulder is opened on the inner wall of purification channel 100a, the positioning flange and the shoulder will form a radial constraint after they are engaged. In the axial direction, filter element 200 can be pressed onto the shoulder by bolts. Alternatively, an interference fit can be used to form multiple tight fits between the outer surface of filter element 200 and the inner wall of purification channel 100a, so as to achieve a stable connection with purification channel 100a. Of course, the fixing method of filter element 200 is not limited to the above two. Since filter element 200 is directly opposite to the flow direction of gas, the impact kinetic energy of high-speed gas will be converted into static pressure, forming a stable laminar flow zone at the filter surface, significantly reducing flow disturbance, and keeping filter element 200 stably in purification channel 100a.

[0067] In one embodiment, the filter element 200 is a conical stainless steel filter element 200, thereby increasing the filter surface area and improving the filtration efficiency when the dust-laden gas medium is input into the medium inlet 100b. At the same time, the gradient filter surface of the conical structure can perform secondary filtration when the gas medium floats up along the purification channel 100a.

[0068] like Figure 1 As shown, the cleaning component 300 is used to clean the dirt accumulated on the filter surface of the filter element 200. The cleaning component 300 is located inside the cleaning port 111. The cleaning component 300 has an operating end and a cleaning end. The operating end extends to the outside of the cleaning port 111 for control, while the cleaning end extends into the purification channel 100a and is connected to the filter element 200. When the operating end is subjected to external driving force, it will be linked to the cleaning end to perform at least one cleaning action such as scraping and vibration on the filter surface of the filter element 200 to peel off and remove the dirt attached to the filter surface, thereby improving the service life of the filter element 200. The operator can evaluate the usage level of the filter element 200 based on the clean gas flow monitoring data of the media outlet 100c, and select the cleaning component 300 to clean the filter element 200 according to the actual working conditions, or perform a maintenance plan of disassembly, cleaning, and replacement. When the clean gas flow rate decline does not exceed the set threshold, the cleaning component 300 can be used to clean the filter element 200.

[0069] likeFigure 1 As shown, the riser 400 is arranged relative to the cleaning port 111, that is, the cleaning port 111 is axially aligned with the inner tube section of the riser 400, the lower end of the riser 400 is connected to the surface of the body 100, and the upper end penetrates upwardly to the ground surface, the inner tube section of the riser 400 serves as an operation channel penetrating the underground and the ground surface, so that the operation end of the cleaning assembly 300 is exposed to the operation interface on the ground surface, and the ground operation personnel can directly control the underground assembly in a visualized manner.

[0070] As shown in FIGS. 1 and 2, the filter element 200 is arranged in the purification channel 100a of the body 100, and the filter element 200 is arranged in the purification channel 100a of the body 100. Figure 1 As shown in FIGS. 1 and 2, the filter element 200 is arranged in the purification channel 100a of the body 100, and the filter element 200 is arranged in the purification channel 100a of the body 100. Figure 9 As shown in FIGS. 1 and 2, the filter element 200 is arranged in the purification channel 100a of the body 100, and the filter element 200 is arranged in the purification channel 100a of the body 100. As shown in FIGS. 1 and 2, the filter element 200 is arranged in the purification channel 100a of the body 100, and the filter element 200 is arranged in the purification channel 100a of the body 100.

[0071] In addition, the filter element of the present application also has the function of a condensate cylinder during the operation of the gas pipeline network. Specifically, when the gas medium flows through the purification channel 100a, condensate water will be formed on the inner wall of the purification channel 100a due to the temperature difference. Under the action of gravity, the condensate water will deposit and collect on the bottom along the inner wall of the purification channel 100a. After the dispersion valve 500 is opened, the condensate water will be discharged along with the solid particle impurities to the outside through the dispersion channel 100d. Thus, the liquid water generated during the gas transmission process can be effectively collected, and the problems of corrosion and increased flow resistance caused by the accumulation of water in the body 100 can be avoided, thereby improving the safety and stability of the gas pipeline network.

[0072] In one embodiment, the dispersion valve 500 is an equal-potential dn50 dispersion ball valve, which can direct the particle impurities to be discharged to the outside along the dispersion channel 100d and eliminate the risk of static electricity during discharge, while ensuring the sealing of the shell under high pressure conditions to ensure safe discharge.

[0073] In an embodiment, the purification channel 100a has a bottom wall inclined to the direction of the discharge channel 100d, the bottom wall forms a flow guide structure, the solid particle impurities filtered by the filter screen are deposited on the bottom wall and converge along the bottom wall to the discharge channel 100d, so as to accelerate the discharge process.

[0074] As shown in Figure 1 and Figures 3 to 8 In addition to the inlet flange elbow 11, the body 100 further includes a sediment well 12, an outlet flange elbow 13, a tee pipe 14, and a discharge pipe group 15.

[0075] The outer wall of the sediment well 12 is integrated with an end pipe 121 and a drain pipe 122, both of which are in communication with the inside of the sediment well 12. The inlet of the end pipe 121 is the medium inlet 100b, and the drain pipe 122 is close to the bottom of the sediment well 12. The filter element 200 is located between the end pipe 121 and the drain pipe 122. The well mouth of the sediment well 12 is connected to one end of the inlet flange elbow 11. More specifically, the well mouth of the sediment well 12 is shaped into a flange interface that is adapted to the inlet flange elbow 11, so as to be detachably connected to the inlet flange elbow 11.

[0076] The outlet flange elbow 13 has a flange interface at one end, and is detachably connected to the other end of the inlet flange elbow 11 through the flange interface. The outlet flange elbow 13 is provided with an avoiding opening 131, which is in communication with the purification channel 100a. The avoiding opening 131 releases the flange connection between the two ends of the inlet flange elbow 11, so that the inlet flange elbow 11 can be separated from the sediment well 12 and the outlet flange elbow 13. The internal space of the sediment well 12 is exposed to the field of view, which facilitates the disassembly, cleaning or replacement of the filter screen.

[0077] The tee pipe 14 is composed of an upper pipe body 141, a lower pipe body 142 and a branch pipe body 143. The upper pipe body 141 is fixed to the other end of the outlet flange elbow 13 by welding. The outlet of the branch pipe body 143 serves as the medium outlet 100c. The pipe wall of the lower pipe body 142 has a socket, which is opposite to the drain pipe 122. The drain pipe 122 is inserted into the lower pipe body 142 through the socket.

[0078] The discharge pipe group 15 is arranged in the tee pipe 14 and the outlet flange elbow 13. One end of the discharge pipe group 15 is connected to the drain pipe 122, and the other end extends to the outside through the avoiding opening 131 and is connected to the discharge valve 500. The discharge pipe group 15 and the drain pipe 122 form a discharge channel 100d therebetween, which is blocked when the valve is in the closed position.

[0079] The internal space of the sedimentation well 12, the inlet flange elbow 11, the outlet flange elbow 13 and the tee pipe 14 are communicated to form a purification channel 100a, the dust-containing gas medium enters from the medium inlet 100b of the sedimentation well 12, and after being filtered by the internal filter element 200, most of the solid particle impurities are intercepted at the bottom of the sedimentation well 12, and the clean gas medium flows through the inlet flange elbow 11, the outlet flange elbow 13 in turn, and is finally discharged through the medium outlet 100c of the upper pipe body 141 and the branch pipe body 143 of the tee pipe 14. When the clean gas medium is output from the medium outlet 100c, when the diffusion valve 500 is opened, the driving force is provided by the internal gas pressure of the purification channel 100a, so that the solid particle impurities deposited at the bottom of the sedimentation well 12 are sequentially discharged to the outside space through the discharge pipe 122 and the diffusion pipe group 15, so as to avoid the blockage of the purification channel 100a and realize the self-cleaning function.

[0080] As shown in Figure 1 , and it should be noted that the diffusion pipe group 15 is arranged in the internal cavity of the tee pipe 14 and the outlet flange elbow 13, forming a compact built-in structure, and the overall size of the filter is reduced by sharing the internal space of the tee pipe 14 and the outlet flange elbow 13 to adapt to the space limitation of the buried installation, and at the same time, the tee pipe 14 and the outlet flange elbow 13 are used as protective shells to ensure the safety and reliability of the diffusion process.

[0081] As shown in Figure 1 and Figure 9 , the diffusion pipe group 15 includes an electric melting elbow 151, a first sealing reducing pipe 152, a center pipe 153 and a second sealing reducing pipe 154:

[0082] The front end of the electric melting elbow 151 is connected to the discharge pipe 122;

[0083] The front end of the first sealing reducing pipe 152 is sealingly connected to the rear end of the electric melting elbow, and the lower pipe body 142 is formed with a sealing plate 142b, the sealing plate 142b is formed with a first butt joint pipe 142c, the space of the lower pipe body 142 on both sides of the sealing plate 142b is communicated through the first butt joint pipe 142c, the rear end of the first sealing reducing pipe 152 is fixedly connected to the first butt joint pipe 142c, and the opening is abutted with the sealing plate 142b, the sealing plate 142b and the first butt joint pipe 142c are used as the force supporting point of the first sealing reducing pipe 152, so that the diffusion pipe group 15 is stably positioned in the radial and axial directions;

[0084] The front end of the center pipe 153 is sealingly connected to the first sealing reducing pipe 152 through the first butt joint pipe 142c, and the first sealing reducing pipe 152 communicates the center pipe 153 with the electric melting elbow pipe, the outer periphery of the avoidance port 131 is formed with a second butt joint pipe 132, and the rear end of the center pipe 153 is arranged in the second butt joint pipe 132;

[0085] The second sealing reducing pipe 154 is sleeved on the second connecting pipe 132 and sealingly connects the central pipe 153, and the diffusion valve 500 is arranged on the central pipe 153;

[0086] When the diffusion valve 500 is opened, the solid particle impurities deposited at the bottom of the sediment well 12 form a directional flow under the driving of the internal gas pressure, sequentially flow through the discharge pipe 122, the electrically fused elbow 151 and the central pipe 153 and are finally forced to be discharged to the outside, avoiding the blockage of the purification channel 100a and realizing the self-cleaning function.

[0087] As shown in Figure 1 , Figure 5 and Figure 8 , the outer wall of the sediment well 12 is formed with a positioning pipe 123, the positioning pipe 123 is arranged in the radial direction and extends to the tee pipe 14, the outer wall of the tee pipe 14 is formed with a positioning shaft 144 extending opposite to the positioning pipe 123, the positioning shaft 144 is insertedly matched with the positioning pipe 123, the locking is realized without additional fasteners, and the assembly stability and coaxiality of the sediment well 12 and the tee pipe 14 are further ensured.

[0088] As shown in Figure 11 , the number of the sediment well 12 is multiple, and the main body 100 further comprises a collecting pipe 16, the collecting pipe 16 is composed of a main pipe body 161, a first branch pipe 162 and a second branch pipe 163:

[0089] The two ends of the main pipe body 161 are closed;

[0090] The number of the first branch pipe 162 is equal to that of the sediment well 12, each first branch pipe 162 is arranged on the outer wall of the main pipe body 161 in the axial direction and communicates with the main pipe body 161, and each first branch pipe 162 is connected with the discharge pipe 122 of the corresponding sediment well 12,

[0091] The second branch pipe 163, the discharge pipe 122 is connected with the diffusion pipe group 15 through the second branch pipe 163, that is, the second branch pipe 163 enters the inside and is connected with the diffusion pipe group 15 through the installation opening 142a on the tee pipe body 142 along with the discharge pipe 122;

[0092] By increasing the number of the sediment well 12, the number of the filter element 200 is correspondingly increased, each sediment well 12 is connected with each other in series through the collecting pipe 16, the dust-containing gas medium is uniformly distributed to each filter element 200 for synchronous filtration, the load of each filter element 200 is effectively dispersed, and the solid particle impurities after filtration are respectively deposited at the bottom of each sediment well 12, when the diffusion valve 500 is opened, the impurities are driven by the internal gas pressure to sequentially pass through the discharge pipe 122, the first branch pipe 162 of the collecting pipe 16, the main pipe and the second branch pipe 163 and enter the diffusion pipe group 15, and finally the centralized discharge is completed.

[0093] In an embodiment, the manifold 16 can be configured in two groups, wherein another group of the manifold 16 is connected with the medium inlet 100b of the sedimentation well 12 through the primary branch pipe 162 thereof, and the secondary branch pipe 163 is connected with the gas medium input end, so that the input gas medium sequentially passes through the secondary branch pipe 163, enters the main pipe body 161, is distributed to each primary branch pipe 162 through the main pipe body 161, and is finally distributed to the corresponding sedimentation well 12, thereby realizing uniform delivery of the gas medium and simplifying the pipeline layout while ensuring uniformity of medium distribution.

[0094] As shown in Figure 1 , Figure 2 and Figure 10 , the filter core 200 is rotationally coupled with the purification channel 100a, and the filter core 200 can rotate horizontally in the purification channel 100a. The cleaning assembly 300 includes a brush 31, a bracket 32, and a rotating shaft 33.

[0095] The brush 31 is located at one side of the filter core 200 and is close to the filter surface of the filter core 200.

[0096] The bracket 32 is connected with the brush 31 and is fixed in the purification channel 100a, so that the brush 31 is also relatively fixed with the purification channel 100a.

[0097] One end of the rotating shaft 33 is connected with the filter core 200, the other end is arranged in the cleaning port 111, and a rotating square head 331 is connected. It is to be noted that the rotating shaft 33 is rotationally coupled with the cleaning port 111, and the shapes of the coupling surfaces of the two ends of the rotating shaft 33 and the filter core 200 and the rotating square head 331 are all non-circular. When the rotating square head 331 is driven by an external force, the rotating shaft 33 drives the filter core 200 to rotate as a whole around the axis through the transmission action of the non-circular coupling surfaces. At this time, the fixedly installed brush 31 moves relative to the filter core 200, thereby mechanically scraping off the dirt attached to the filter surface.

[0098] As shown in Figure 2 , a support framework 21 is formed at the outer edge of the filter core 200, and a clamping groove 100e is correspondingly arranged on the inner wall of the purification channel 100a. More specifically, the clamping groove 100e includes a groove body arranged at the well opening position of the sedimentation well 12. After the inlet flange elbow 11 is connected with the sedimentation well 12, the upper opening of the groove body is closed, and a complete clamping groove 100e is formed. The support framework is inserted into the clamping groove 100e and is gap-coupled with the clamping groove 100e. The clamping groove 100e provides support for the filter core 200 and allows the filter core 200 to rotate horizontally in the purification channel 100a under the action of the rotating shaft 33 of the cleaning assembly. A sealing ring 600 is arranged between the clamping groove 100e and the support framework 21, thereby forming a dynamic seal, effectively blocking the particles from entering the coupling gap, reducing friction loss, and prolonging the service life of the filter core 200.

[0099] Furthermore, the filter element 200 contains at least one adsorbent material selected from molecular sieve, activated carbon, and activated alumina. During installation, the selected adsorbent material is uniformly filled into the filter element 200 and a stable adsorption layer can be formed by compression. When the dust-laden gas medium flows through the filter element 200, the dust particles in the medium will be adsorbed by the adsorbent material. Among them, the molecular sieve captures inorganic dust through microporous sieving, the activated carbon adsorbs organic aerosols, and the activated alumina captures hydrophilic particles, so that the gas medium is purified to meet the cleanliness standard.

[0100] In one embodiment, a leak-proof component may be provided at the net inlet of the filter element 200. The leak-proof component is covered with through holes, including but not limited to perforated metal mesh or porous sintered metal mesh. The pore size of each through hole is smaller than the minimum particle size of the adsorbent material. The leak-proof component can be fixed at the net inlet of the filter element 200 by snap-fit ​​or welding, forming a mechanical barrier to the internal adsorbent material, while allowing the purified gas medium to pass smoothly to the other side of the purification channel 100a.

[0101] like Figure 1 As shown, the upper end of the riser 400 is provided with an openable and closable sealing manhole cover 700. The manhole cover 700 is detachably connected to or hinged to the riser 400, allowing the riser 400 to be selectively locked. When the manhole cover 700 is in the closed state, it forms a sealing fit with the upper end of the riser 400, keeping the internal cleaning component 300 in a sealed protective state, effectively preventing external rainwater and dust from entering. When maintenance operations are required on the filter element 200, the locked state of the riser 400 can be released by removing or rotating the manhole cover 700, and the cleaning operation can be performed quickly.

[0102] It should be mentioned that the main materials of the sedimentation well 12, inlet flange elbow 11, outlet flange elbow 13, tee pipe 14, riser 400, well cover 700, rotating square head 331, electrofusion elbow 151, first sealing reducer 152, center pipe 153, second sealing reducer 154, and vent valve 500 are all PE, which gives them excellent chemical corrosion resistance and allows them to operate better in buried conditions.

[0103] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in this application can be executed in parallel, sequentially or in different orders, as long as the desired result of the technical solution disclosed in this application can be achieved, and this is not limited herein.

[0104] The embodiments and descriptions above are merely illustrative of the principles and preferred embodiments of this application. Various changes and modifications may be made to this application without departing from the spirit and scope thereof, and all such changes and modifications fall within the scope of this application as claimed.

Claims

1. A PE pre-filter for valve of direct-buried gas pipeline without corrosion prevention, characterized in that, It comprises: a body (100) having a purification channel (100a) inside, two ends of the purification channel (100a) penetrating the surface of the body (100) to form a medium inlet (100b) and a medium outlet (100c) respectively, the body (100) comprising a detachable inlet flange elbow (11), the surface of the inlet flange elbow (11) having a cleaning port (111) in communication with the purification channel (100a); a filter element (200) arranged in the purification channel (100a), the filter element (200) being opposite to the inlet flange elbow (11) and its filter surface being opposite to the medium inlet (100b); a cleaning assembly (300) movably mounted in the cleaning port (111) and extending into the purification channel (100a) to connect with the filter element (200) for cleaning the filter element (200); a stand pipe (400) arranged on the surface of the body (100) opposite to the cleaning port (111) and penetrating upward to the ground surface.

2. The pre-filter for PE valve of the non-corrosion direct-buried gas pipeline according to claim 1, characterized in that, The body (100) has a diffusion channel (100d) inside, one end of the diffusion channel (100d) being in communication with the bottom of the purification channel (100a) and the other end penetrating the surface of the body (100) and being connected with a diffusion valve (500), the filter element (200) being located between the medium inlet (100b) and the diffusion channel (100d).

3. The pre-filter for PE valve of the non-corrosion direct-buried gas pipeline according to claim 2, characterized in that, The body (100) further comprises: a sedimentation well (12) having an end pipe (121) and an end pipe (122), the inlet of the end pipe (121) being the medium inlet (100b), the end pipe (122) being close to the bottom of the sedimentation well (12), the filter element (200) being located between the end pipe (121) and the end pipe (122), the well mouth of the sedimentation well (12) being connected with the inlet flange elbow (11); an outlet flange elbow (13) connected with the inlet flange elbow (11), the outlet flange elbow (13) being provided with a bypass port (131); a tee pipe (14) having an upper pipe body (141), a lower pipe body (142) and a branch pipe body (143), the upper pipe body (141) being connected with the outlet flange elbow (13), the branch pipe body (143) having an outlet as the medium outlet (100c), the lower pipe body (142) being provided with a mounting port (142a), the end pipe (122) penetrating the mounting port (142a) to the inside of the lower pipe body (142); a diffusion pipe group (15) penetrating the tee pipe (14) and the outlet flange elbow (13), the diffusion pipe group (15) being connected with the end pipe (122) and extending to the outside through the bypass port (131) and being connected with the diffusion valve (500).

4. The pre-filter for PE valve of the non-corrosion direct-buried gas pipeline according to claim 3, characterized in that, The diffusion pipe group (15) comprises: an electrically fused elbow (151) connected with the end pipe (122); A first sealing reducing pipe (152) is sealingly connected with the electrically fused elbow (151), a sealing plate (142b) is formed in the lower pipe body (142), a first connecting pipe (142c) is formed on the sealing plate (142b), the first sealing reducing pipe (152) is fixedly connected with the first connecting pipe (142c); A central pipe (153) is sealingly connected with the first connecting pipe (142c) and the first sealing reducing pipe (152), a second connecting pipe (132) is formed on the outer periphery of the avoiding opening (131), the central pipe (153) further passes through the second connecting pipe (132) to the outside; A second sealing reducing pipe (154) is sleeved on the second connecting pipe (132) and sealingly connected with the central pipe (153), and the diffusion valve (500) is arranged on the central pipe (153).

5. The pre-filter for PE valve of the non-corrosion direct-buried gas pipeline according to claim 3, characterized in that, An outer wall of the precipitation well (12) is formed with a positioning pipe (123), an outer wall of the three-way pipe (14) is formed with a positioning shaft (144) extending in opposition, and the positioning shaft (144) is insertedly matched with the positioning pipe (123).

6. The pre-filter for PE valve of the non-corrosion direct-buried gas pipeline according to claim 3, characterized in that, The number of the precipitation wells (12) is multiple, and the body (100) further comprises a collecting pipe (16), which comprises: A main pipe body (161); A primary branch pipe (162) is arranged in the same number as the precipitation wells (12) and axially arranged along the main pipe body (161), and the primary branch pipe (162) is connected with the end pipe (122) of the corresponding precipitation well (12); A secondary branch pipe (163), the end pipe (122) is connected with the diffusion pipe group (15) through the secondary branch pipe (163).

7. The pre-filter for PE valve of the non-corrosion direct-buried gas pipeline according to claim 1, characterized in that, The filter core (200) is rotationally matched with the purification channel (100a), and the cleaning assembly (300) comprises: A brush (31) is located on one side of the filter core (200) and close to the filter surface of the filter core (200); A support (32) is connected with the brush (31) and fixed in the purification channel (100a); A rotating shaft (33) is connected with the filter core (200) and passes through the cleaning opening (111) and is connected with a rotating square head (331).

8. The pre-filter for PE valve of the non-corrosion direct-buried gas pipeline according to claim 7, characterized in that, An outer edge of the filter core (200) is formed with a support framework (21), an inner wall of the purification channel (100a) is correspondingly formed with a clamping groove (100e), the support framework (21) is embedded in the clamping groove (100e) and is gap matched with the clamping groove (100e), and a sealing ring is arranged between the clamping groove (100e) and the support framework (21).

9. The pre-filter for PE valve of the non-corrosion direct-buried gas pipeline according to claim 1, characterized in that, The filter core (200) is internally provided with at least one of a molecular sieve, activated carbon and activated alumina.

10. The pre-filter for PE valve of the non-corrosion direct-buried gas pipeline according to claim 1, characterized in that, An upper end of the vertical pipe (400) is provided with an openable and closable well lid (700).

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