Online self-cleaning filtering device

Abstract

The invention belongs to the technical field of filter screen filtering devices, and discloses an online self-cleaning filtering device which comprises an inner barrel, an outer barrel, a filtering barrel, a cleaning assembly and a pollution discharge section. The inner cylinder is sleeved with the outer cylinder, the inner cylinder is provided with a liquid inlet and a drain outlet, the outer cylinder is provided with a liquid outlet, the filter cylinder is located in the inner cylinder, and an overflowing hole is formed in the inner cylinder; the cleaning assembly comprises a push-type broach, the push-type broach is located in the inner cylinder, and a backflow hole is formed in the push-type broach and can be opened or closed; the pollution discharge section comprises a pollution discharge cylinder and a pollution discharge cover assembly, and the pollution discharge cover assembly is located in the pollution discharge cylinder and used for closing or opening the pollution discharge port of the inner cylinder. When the sewage draining exit is closed, the backflow hole is opened, and the push broach can move in the axial direction of the inner barrel body to scrape impurities on the filter barrel body and push the impurities to be accumulated to the sewage draining exit; when the sewage draining exit is opened, the backflow hole is closed, and the push broach can push impurities into the sewage draining barrel. The on-line self-cleaning filtering device can realize continuous filtration of the stock solution and can avoid loss of the stock solution.

Description

Technical Field

[0001] This invention relates to the field of filter screen filtration devices, and more particularly to an online self-cleaning filtration device. Background Technology

[0002] In the continuous polymerization process of spandex, the filter screen is a key piece of equipment for separating impurities and ensuring the stable operation of subsequent processes. To ensure the filtration effect of the filter screen in the filter screen, it is necessary to clean or replace the filter screen regularly.

[0003] Typically, filter screen filtration devices include cleaning components (such as push blades) to achieve automatic online cleaning of the filter screen, avoiding downtime for disassembly and reassembly. However, this type of online self-cleaning filter screen filtration device cleans the filter screen by mechanical scraping and centrifugal separation. That is, the scraped impurities are effectively separated by gravity or centrifugal force, and its separation efficiency is highly dependent on the density difference between the material and the impurities. In spandex production, the raw solution is a high-viscosity polymer solution, and the density of the gel impurities generated by the reaction is close to that of the raw solution. This characteristic means that the gel (impurities) after mechanical scraping cannot settle quickly, but instead will be re-mixed into the system due to the flow disturbance of the raw solution, resulting in poor filtration effect.

[0004] Therefore, there is an urgent need to develop an online self-cleaning filtration device to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide an online self-cleaning filtration device that can achieve online self-cleaning while continuously filtering the original liquid and avoiding loss of the original liquid.

[0006] To achieve this objective, the present invention adopts the following technical solution: Online self-cleaning filter device, including: The inner cylinder and the outer cylinder are fitted around the outer side of the inner cylinder, and there is a gap between the outer side wall of the inner cylinder and the inner side wall of the outer cylinder. One end of the inner cylinder is provided with a liquid inlet, and one end of the outer cylinder is provided with a liquid outlet. The liquid outlet is connected to the gap, and the other end of the inner cylinder is provided with a drain outlet. A filter cylinder is located inside the inner cylinder and is positioned near the drain outlet. The outer wall of the filter cylinder is in contact with the inner wall of the inner cylinder. The filter cylinder is provided with filter holes. The part of the inner cylinder that is in contact with the filter cylinder is provided with flow holes, and the flow holes are in communication with the filter holes. The cleaning assembly includes a pusher blade located within the inner cylinder and movably connected to the inner wall of the filter cylinder. The pusher blade is provided with a return hole that can be opened or closed. The sewage discharge section includes a sewage discharge cylinder and a sewage discharge cover assembly. The sewage discharge cylinder is located at the end of the outer cylinder opposite to the liquid inlet, and the sewage discharge cover assembly is located inside the sewage discharge cylinder for closing or opening the sewage outlet of the inner cylinder. When the drain outlet is closed, the reflux hole is open, and the pusher can move axially along the inner cylinder to scrape off impurities on the filter cylinder and push the impurities to accumulate at the drain outlet; when the drain outlet is open, the reflux hole is closed, and the pusher can push the impurities into the drain cylinder.

[0007] As an optional technical solution for an online self-cleaning filter device, the drain cover assembly includes a piston, which is movably connected to the drain cylinder, so that the piston can move along the axial direction of the inner cylinder toward or away from the drain outlet to close or open the drain outlet.

[0008] As an optional technical solution for an online self-cleaning filter device, the piston has a plunger on the side facing the pusher, the plunger is adapted to the reflux hole, and the plunger can pass through the reflux hole to close the reflux hole.

[0009] As an optional technical solution for an online self-cleaning filtration device, the drain cover assembly further includes an elastic element, the two ends of which are respectively connected to the inner wall of the drain cylinder and the piston; the piston has a top post on the side facing the pusher, the length of the top post is less than the length of the plunger, the plunger is in clearance fit with the return hole, and the pusher can push the piston through the top post to open the drain port.

[0010] As an optional technical solution for an online self-cleaning filtration device, the drain cover assembly also includes a fixing seat, which is fixed to the inner wall of the drain cylinder, and the elastic element is located between the piston and the fixing seat.

[0011] As an optional technical solution for an online self-cleaning filter device, the online self-cleaning filter device further includes a partition plate located between the sewage discharge cylinder and the outer cylinder. The partition plate is provided with a through hole, which is directly opposite to the sewage discharge port. The inner cylinder passes through the through hole and is connected to the partition plate.

[0012] As an optional technical solution for an online self-cleaning filter device, the pusher blade has a groove on the side facing the sewage discharge section, and the groove extends along the outer circumference of the pusher blade and is arranged in a closed loop; And / or, the cleaning assembly further includes a push rod, one end of which is connected to the side of the push blade away from the drain section, and the other end extends out of the inner cylinder body; And / or, the inner cylinder includes a first inner cylinder and a second inner cylinder, the outer cylinder includes a first outer cylinder and a second outer cylinder, the first outer cylinder, the second outer cylinder and the drain cylinder are sequentially and sealed together, the first inner cylinder, the second inner cylinder and the drain cover assembly are sequentially connected, the liquid inlet is located in the first inner cylinder, the filter cylinder is located in the second inner cylinder, and the liquid outlet is located in the first outer cylinder.

[0013] As an optional technical solution for an online self-cleaning filter device, the online self-cleaning filter device further includes a first end cap, an inlet pipe, and an outlet pipe. The first end cap is sealed at the end of the outer cylinder and the inner cylinder that is away from the sewage discharge cylinder. The inlet pipe passes through the side wall of the outer cylinder and communicates with the inlet port. The outlet port is located on the side wall of the outer cylinder and communicates with the outlet pipe.

[0014] As an optional technical solution for an online self-cleaning filter device, the online self-cleaning filter device further includes a mechanical seal, which is located at the center of the first end cap to mechanically seal the first end cap, the outer cylinder, and the inner cylinder.

[0015] As an optional technical solution for an online self-cleaning filter device, the inner cylinder and the outer cylinder are placed horizontally. The online self-cleaning filter device also includes a base, which is vertically set on the ground, and the top of the base abuts and supports the bottom of the outer cylinder. The liquid inlet is located at the bottom of the inner cylinder, and the liquid outlet is located at the top of the outer cylinder.

[0016] The beneficial effects of this invention are: The online self-cleaning filtration device provided by this invention includes an inner cylinder, an outer cylinder, a filter cylinder, a cleaning component, and a drain section. In actual operation, the drain port is closed, and the raw liquid enters the inner cylinder through the inlet. Under pressure differential, it permeates through the filter pores of the filter cylinder, trapping impurities in the raw liquid on the inner wall of the filter cylinder. The filtered clean liquid enters the compartment through the flow hole and is then discharged from the outlet. During this process, when cleaning of the filter cylinder is required, the pusher is pushed axially towards the drain section along the inner cylinder, and the reflux hole is opened to balance the pressure on both sides of the pusher. This allows the pusher to scrape off impurities adhering to the inner wall of the filter cylinder and push them forward to accumulate at the drain port. When excessive impurities accumulate and need to be discharged from the inner cylinder, the reflux hole of the pusher closes, the drain port opens, and the pusher continues to push the impurities to the drain cylinder while preventing the raw liquid from entering the drain cylinder through the reflux hole. After draining, the drain port closes, the reflux hole opens, and the pusher returns to its original position, achieving separate storage of the raw liquid and impurities to avoid affecting subsequent raw liquid filtration.

[0017] Therefore, this online self-cleaning filtration device, while achieving the traditional online cleaning and scraping function, also has the ability to continuously filter raw liquid and store impurities in separate areas, solving the core contradiction between traditional filtration and cleaning. It is especially suitable for filtering high-viscosity polymer solutions such as spandex. At the same time, it can continue to supply liquid during cleaning and sewage discharge to ensure continuous filtration of raw liquid with high filtration efficiency. Moreover, during sewage discharge, the return hole is closed, and the pusher pushes out impurities while sealing the inner cylinder, thereby preventing raw liquid from entering the sewage discharge cylinder and causing raw liquid loss. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the online self-cleaning filter device provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the piston structure provided in an embodiment of the present invention; Figure 3 This is a first working state diagram of the online self-cleaning filter device (partial) provided in an embodiment of the present invention; Figure 4 This is a partial diagram of the second working state of the online self-cleaning filter device provided in an embodiment of the present invention; Figure 5 This is a third working state diagram of the online self-cleaning filter device (partial) provided in an embodiment of the present invention; Figure 6 This is a diagram showing the fourth working state of the online self-cleaning filter device (partial) provided in an embodiment of the present invention.

[0019] In the picture: 110. First inner cylinder; 111. Liquid inlet pipe; 120. Second inner cylinder; 130. Mechanical seal; 210. First outer cylinder; 211. Liquid outlet pipe; 220. Second outer cylinder; 230. First end cap; 240. First screw; 250. First bolt pair; 260. Second bolt pair; 300. Filter cylinder; 410. Push knife; 411. Return hole; 412. Groove; 420. Push rod; 510. Drainage cylinder; 511. Drainage pipe; 520. Piston; 521. Plunger; 522. Top column; 523. Base; 524. Sealing ring; 530. Elastic element; 540. Fixing seat; 550. Partition plate; 560. Second screw; 570. Second end cap; 600. Foot. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0021] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0024] This embodiment provides an online self-cleaning filtration device that can achieve online self-cleaning while continuously filtering the original liquid and avoiding loss of the original liquid.

[0025] Specifically, such as Figures 1 to 6As shown, the online self-cleaning filtration device includes an inner cylinder, an outer cylinder, a filter cylinder 300, a cleaning component, and a drain section. The outer cylinder is fitted over the outer side of the inner cylinder, and a gap is provided between the outer wall of the inner cylinder and the inner wall of the outer cylinder. One end of the inner cylinder has a liquid inlet, and one end of the outer cylinder has a liquid outlet, which communicates with the gap. The other end of the inner cylinder has a drain outlet. The filter cylinder 300 is located inside the inner cylinder and is positioned near the drain outlet. The outer wall of the filter cylinder 300 is in contact with the inner wall of the inner cylinder. The filter cylinder 300 has filter holes, and the part where the inner cylinder and the filter cylinder 300 are in contact has flow holes that communicate with the filter holes. Normally, the diameter of the flow-through orifice is larger than that of the filter orifice, facilitating the flow of clean liquid after filtration into the gap. The cleaning component includes a pusher 410, which is located inside the inner cylinder and movably connected to the inner wall of the filter cylinder 300. The pusher 410 is provided with a return hole 411, which can be opened or closed. The drain section includes a drain cylinder 510 and a drain cover assembly. The drain cylinder 510 is located at the end of the outer cylinder opposite to the liquid inlet, and the drain cover assembly is located inside the drain cylinder 510 to close or open the drain port of the inner cylinder. When the drain port is closed, the return hole 411 is open, and the pusher 410 can move axially along the inner cylinder to scrape off impurities on the filter cylinder 300 and push the impurities to accumulate at the drain port. When the drain port is open, the return hole 411 is closed, and the pusher 410 can push the impurities into the drain cylinder 510.

[0026] In actual operation, the drain outlet is closed, and the raw liquid enters the inner cylinder through the feed inlet. Under the action of pressure difference, it permeates through the filter holes of the filter cylinder 300. Impurities in the raw liquid are trapped on the inner wall of the filter cylinder 300. The filtered clean liquid enters the compartment through the flow hole and is then discharged from the outlet. During this process, when the filter cylinder 300 needs to be cleaned, the pusher 410 is pushed along the axial direction of the inner cylinder towards the drain section (forward), and the return hole 411 is opened to balance the pressure on both sides of the pusher 410, so that the pusher 410 can scrape off the impurities attached to the inner wall of the filter cylinder 300 and push them forward to accumulate at the drain port; when too many impurities accumulate and need to be discharged from the inner cylinder, the return hole 411 of the pusher 410 is closed, the drain port is opened, and the pusher 410 is pushed to push the impurities to the drain cylinder 510 while preventing the raw liquid from entering the drain cylinder 510 through the return hole 411. When the draining is finished, the drain port is closed, the return hole 411 is opened, and the pusher 410 returns to its original position (backward), so as to realize the separate storage of raw liquid and impurities (raw liquid in the inner cylinder, impurities in the drain cylinder 510), so as to avoid affecting the subsequent raw liquid filtration. Therefore, this online self-cleaning filtration device, while achieving the traditional online cleaning and scraping function, also has the ability to continuously filter raw liquid and store impurities in separate areas, solving the core contradiction between traditional filtration and cleaning. It is especially suitable for filtering high-viscosity polymer solutions such as spandex. At the same time, it can continue to supply liquid during cleaning and sewage discharge to ensure continuous filtration of raw liquid and high filtration efficiency. Moreover, during sewage discharge, the return hole 411 is closed, and the pusher 410 pushes out impurities while sealing the inner cylinder, thereby preventing raw liquid from entering the sewage discharge cylinder 510 and causing raw liquid loss.

[0027] It should be noted that during the filtration process, if the filter cylinder 300 does not require cleaning, the pusher 410 should be positioned at the end of the inner cylinder away from the drain section, preferably on the side of the inlet away from the drain section, i.e., the leftmost end in the diagram, to avoid affecting the flow of the original liquid. If the filter cylinder 300 requires cleaning, push the pusher 410 forward. The pusher 410 enters the filter cylinder 300 and continues to move forward, scraping off the impurities attached to the inner wall of the filter cylinder 300 and pushing the impurities forward until they reach the drain port. When the pusher 410 is about to leave the filter cylinder 300, close the return hole 411 and open the drain port to discharge the impurities into the drain cylinder 510. Alternatively, the impurities can be temporarily not discharged, the pusher 410 can return to its original position, and then move forward again. In other words, the pusher 410 repeatedly scrapes and pushes the impurities until too many impurities accumulate, and then the drain port is opened to discharge the impurities.

[0028] Optionally, the drain cylinder 510 is provided with a drain pipe 511 for discharging impurities. In this embodiment, the drain pipe 511 is located at the bottom of the drain cylinder 510 to facilitate the discharge of impurities.

[0029] Optionally, the pusher 410 has a groove 412 on the side facing the sewage discharge section. The groove 412 extends along the outer periphery of the pusher 410 and is arranged in a closed loop. The groove 412 can temporarily store the scraped impurities and prevent too many impurities from entering the other side of the pusher 410 (left side in the figure) through the return hole 411.

[0030] Optionally, continue as follows Figure 1 As shown, the inner and outer cylinders are placed horizontally. The online self-cleaning filter also includes a base 600, which is vertically set on the ground. The top of the base 600 abuts against and supports the bottom of the outer cylinder. The base 600 supports and fixes the outer cylinder, providing strong stability.

[0031] The number of base feet 600 can be multiple, and the multiple base feet 600 are evenly distributed along the axial direction of the outer cylinder. For example, there can be two, three or four.

[0032] Optionally, the inlet and outlet are located at the same end of the online self-cleaning filter.

[0033] Optionally, the liquid inlet is located at the bottom of the inner cylinder, and the liquid outlet is located at the top of the outer cylinder. The raw material is liquid, which enters from the bottom and flows out from the top, filling the cavity of the device (the cavity formed by the inner cylinder and the cavity formed by the spacers) by gravity.

[0034] Optionally, the inner cylinder includes a first inner cylinder 110 and a second inner cylinder 120, and the outer cylinder includes a first outer cylinder 210 and a second outer cylinder 220. The first outer cylinder 210, the second outer cylinder 220, and the drain cylinder 510 are sequentially and sealed together. The first inner cylinder 110, the second inner cylinder 120, and the drain cover assembly are sequentially connected. The liquid inlet (liquid inlet pipe 111) is located in the first inner cylinder 110, the filter cylinder 300 is located in the second inner cylinder 120, and the liquid outlet (liquid outlet pipe 211) is located in the first outer cylinder 210. That is to say, the inner cylinder and the outer cylinder are each composed of two sections. The first inner cylinder 110 and the first outer cylinder 210 form the raw material section, and the second inner cylinder 120, the second outer cylinder 220, and the filter cylinder 300 form the filter section. The split design facilitates manufacturing and installation.

[0035] Optionally, the online self-cleaning filter also includes a first end cap 230, an inlet pipe 111, and an outlet pipe 211. The first end cap 230 is sealed at the end of the outer cylinder and the inner cylinder opposite to the drain cylinder 510. The inlet pipe 111 passes through the side wall of the outer cylinder and communicates with the inlet port. The outlet port is located on the side wall of the outer cylinder and communicates with the outlet pipe 211. That is, both the inlet pipe 111 and the outlet pipe 211 are located in the part of the raw material section near the front end. The first end cap 230 is sealed at the end openings of the inner cylinder and the outer cylinder, respectively. The inlet pipe 111 and the outlet pipe 211 are located on the side walls of the inner cylinder and the outer cylinder, respectively, so that the raw liquid enters from the side wall of the inner cylinder and the clean liquid (filtered liquid) flows out from the side wall of the outer cylinder.

[0036] Optionally, the cleaning assembly also includes a push rod 420, one end of which is connected to the side of the push knife 410 away from the sewage discharge section, and the other end extends to the outside of the inner cylinder. That is, the other end of the push rod 420 passes through the first end cap 230 and is located outside the first inner cylinder 110, and the push knife 410 is driven to move by the push rod 420.

[0037] Furthermore, the online self-cleaning filter also includes a mechanical seal 130, which is located at the center of the first end cap 230 to mechanically seal the first end cap 230, the outer cylinder, and the inner cylinder. The mechanical seal 130 seals the push rod 420 that protrudes from the first end cap 230 to prevent leakage of the original liquid.

[0038] Optionally, the online self-cleaning filter device also includes a partition 550, which is located between the drain cylinder 510 and the outer cylinder. The partition 550 has a through hole that is directly opposite the drain outlet. The inner cylinder passes through the through hole and is connected to the partition 550. The partition 550 is used to seal the rear end of the gap between the outer cylinder and the inner cylinder, and facilitates the connection and sealing of the rear ends of the outer cylinder and the inner cylinder, as well as the connection and sealing of the drain cylinder 510 of the outer cylinder.

[0039] It should be noted that the drain outlet and the through hole are flush with the side facing the drain cylinder 510. Therefore, it can also be said that the drain cover assembly is used to open and close the through hole.

[0040] In this embodiment, the front end of the first outer cylinder 210 is fixedly connected to the first end cap 230 by the first screw 240, and the rear end of the first outer cylinder 210 is coaxially nested with the first inner cylinder 110 and fixed by welding. The front end of the first inner cylinder 110 is in sealed contact with the first end cap 230, and the rear end is in sealed contact with the second inner cylinder 120, forming a closed feed chamber. At the same time, the first outer cylinder 210 and the second outer cylinder 220 are detachably connected by the first bolt pair 250, which facilitates equipment maintenance. The filter cylinder 300 is coaxially sleeved inside the second inner cylinder 120, constituting the core filtration area. The rear end of the second inner cylinder 120 is in contact with the drain cover assembly, forming a closed filtration chamber, ensuring that the raw liquid can only permeate through the filter cylinder 300 and enter the subsequent chamber under the action of pressure difference. The second outer cylinder 220 and the partition plate 550 are detachably connected by the second bolt pair 260. The partition plate 550 and the second outer cylinder 220 are sealed together to form a closed cavity for the filtered liquid. The front end of the sewage discharge cylinder 510 is welded to the partition plate 550, and the rear end of the sewage discharge cylinder 510 is fixedly connected to the second end cap 570 by the second screw 560. A closed space for temporary storage of impurities is formed inside the sewage discharge cylinder 510.

[0041] There are two bases 600, which are located at the bottom of the raw material section and the bottom of the filter section, specifically at the bottom of the first outer cylinder 210 and the bottom of the second outer cylinder 220.

[0042] Optionally, continuing as shown in the figure, the drain cover assembly includes a piston 520, which is movably connected to the drain cylinder 510, allowing the piston 520 to move axially along the inner cylinder toward or away from the drain outlet to close or open the drain outlet. The piston 520's structural design enables the drain cover assembly to open and close the drain outlet through a push-pull-back operation.

[0043] Furthermore, a plunger 521 is provided on the side of the piston 520 facing the pusher 410. The plunger 521 is adapted to the reflux hole 411 and can pass through the reflux hole 411 to close it. The structure for closing the reflux hole 411 is provided on the piston 520. While pushing the pusher 410 forward, the reflux hole 411 can be closed, making the operation simple. Specifically, when it is necessary to expel impurities, the pusher 410 is pushed forward until the plunger 521 on the piston 520 is inserted into the reflux hole 411 to close it. The pusher 410 and the piston 520 move together as a whole in the direction away from the liquid inlet. That is to say, while pushing the pusher 410 forward, the piston 520 is also pulled back to open the drain port.

[0044] Furthermore, the drain cover assembly also includes an elastic element 530, with its two ends connected to the inner wall of the drain cylinder 510 and the piston 520, respectively. The piston 520 has a top post 522 on the side facing the pusher 410. The length of the top post 522 is less than the length of the plunger 521. The plunger 521 is clearance-fitted with the return hole 411. The pusher 410 can push the piston 520 through the top post 522 to open the drain port. In the initial state, piston 520, under the elastic force of elastic element 530, presses against the drain port (through hole of partition 550), achieving a sealed isolation between drain cylinder 510 and second outer cylinder 220. When excessive impurities accumulate and need to be discharged, pusher 410 is pushed forward, and plunger 521 on piston 520 contacts return hole 411 of pusher 410 to form a sealed cavity. Continuing to push pusher 410 forward, top pin 522 on piston 520 contacts pusher 410 first, causing piston 520 to move as a whole and open drain port. After draining, pusher 410 returns to its original position, and piston 520 rebounds under the restoring force of elastic element 530 to close drain port. The length of top pin 522 is less than the length of plunger 521, ensuring that return hole 411 of pusher 410 contacts plunger 521 first to form a sealed cavity, ensuring that raw materials do not leak into the drain section during cleaning, before contacting top pin 522 to push piston 520.

[0045] In this embodiment, the top post 522 is located at the center of the piston 520, so that the piston 520 is subjected to uniform force; there are multiple plungers 521, and the multiple plungers 521 are evenly spaced along the outer circumference of the top post 522, and the corresponding return holes 411 are evenly spaced along the circumference of the pusher 410, with each plunger 521 corresponding to a return hole 411.

[0046] The drain cover assembly also includes a sealing ring 524. The piston 520 is provided with a sealing groove, which extends along the outer circumference of the piston 520 and is arranged in a closed loop. The sealing ring 524 is located in the sealing groove to increase the sealing performance of the piston 520 at the drain outlet.

[0047] Furthermore, the sealing ring 524 is made of fluororubber, and the sealing groove has a V-shaped cross section, which can achieve self-tightening sealing under pressure.

[0048] In this embodiment, the drain cover assembly also includes a fixing seat 540, which is fixed to the inner wall of the drain cylinder 510, and the elastic element 530 is located between the piston 520 and the fixing seat 540.

[0049] Similarly, a base 523 is provided on the side of the piston 520 facing the fixed seat 540, and the two ends of the elastic member 530 abut against the base 523 and the fixed seat 540 respectively, which facilitates the connection of the elastic member 530.

[0050] In this embodiment, the elastic element 530 is a spring.

[0051] Continue as Figures 3 to 6 As shown, the specific working process of this online self-cleaning filter device is as follows: Filtration stage: The raw liquid enters the first inner cylinder 110 of the raw material section through the inlet pipe 111. Under the pressure difference between the feed chamber and the post-filtration chamber, it permeates the filter pores of the filter cylinder 300. Impurities in the raw liquid (such as gel impurities) are trapped on the inner wall of the filter cylinder 300. The filtered clean liquid enters the space between the second inner cylinder 120 and the second outer cylinder 220 of the filtration section, and then flows to the space between the first outer cylinder 210 and the first inner cylinder 110 of the raw material section. Finally, it is discharged from the outlet pipe 211, realizing continuous filtration.

[0052] Cleaning stage: As the filtration time increases, impurities trapped on the filter cylinder 300 accumulate, leading to increased filtration resistance. At this time, the pusher 410 is driven to move along the axial direction of the filter cylinder 300 (inner cylinder) towards the drain section. The outer ring of the pusher 410 fits tightly against the inner wall of the filter cylinder 300, thoroughly scraping off the attached gel impurities, which accumulate in the groove 412 of the pusher 410 and are pushed forward. During the movement of the pusher 410, the return hole 411 and the plunger 521 on the piston 520 form a clearance fit. This structure can block the raw material and prevent it from flowing to the drain section during the cleaning process. When the pusher 410 moves to the piston 520, its thrust overcomes the spring force and pushes the piston 520 to the right, connecting the filtration section and the drain section. The scraped gel impurities are pushed into the drain cylinder 510 by the pusher 410, realizing the partitioned storage of impurities.

[0053] Reset phase: After cleaning, the drive pusher 410 is reversed and reset, the cooperation between the return hole 411 and the plunger 521 of the piston 520 is released, and the piston 520 is pressed against the through hole of the partition 550 again under the action of the spring force, realizing the re-sealing and isolation between the sewage discharge section and the filtration section; the gel impurities are periodically discharged and recycled by opening the valve at the sewage discharge pipe 511. The entire cleaning process does not require stopping the machine and does not affect the continuous filtration of the original liquid.

[0054] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An online self-cleaning filter device, characterized in that, include: The inner cylinder and the outer cylinder are fitted around the outer side of the inner cylinder, and there is a gap between the outer side wall of the inner cylinder and the inner side wall of the outer cylinder. One end of the inner cylinder is provided with a liquid inlet, and one end of the outer cylinder is provided with a liquid outlet. The liquid outlet is connected to the gap, and the other end of the inner cylinder is provided with a drain outlet. A filter cylinder (300) is located inside the inner cylinder and near the drain outlet. The outer side wall of the filter cylinder (300) is attached to the inner side wall of the inner cylinder. The filter cylinder (300) is provided with filter holes. The part of the inner cylinder and the filter cylinder (300) that are attached together is provided with flow holes. The flow holes are connected to the filter holes. The cleaning assembly includes a pusher (410) located inside the inner cylinder and movably connected to the inner wall of the filter cylinder (300). The pusher (410) is provided with a return hole (411) which can be opened or closed. The sewage discharge section includes a sewage discharge cylinder (510) and a sewage discharge cover assembly. The sewage discharge cylinder (510) is located at the end of the outer cylinder opposite to the liquid inlet. The sewage discharge cover assembly is located inside the sewage discharge cylinder (510) and is used to close or open the sewage discharge port of the inner cylinder. When the drain outlet is closed, the reflux hole (411) is opened, and the pusher (410) can move axially along the inner cylinder to scrape off impurities on the filter cylinder (300) and push the impurities to accumulate at the drain outlet; when the drain outlet is open, the reflux hole (411) is closed, and the pusher (410) can push the impurities into the drain cylinder (510).

2. The online self-cleaning filter device according to claim 1, characterized in that, The drain cover assembly includes a piston (520) which is movably connected to the drain cylinder (510) so that the piston (520) can move along the axial direction of the inner cylinder toward or away from the drain outlet to close or open the drain outlet.

3. The online self-cleaning filter device according to claim 2, characterized in that, The piston (520) has a plunger (521) on the side facing the pusher (410). The plunger (521) is adapted to the return hole (411). The plunger (521) can pass through the return hole (411) to close the return hole (411).

4. The online self-cleaning filter device according to claim 3, characterized in that, The drain cover assembly also includes an elastic element (530), the two ends of which are respectively connected to the inner wall of the drain cylinder (510) and the piston (520); the piston (520) has a top post (522) on the side facing the pusher (410), the length of the top post (522) is less than the length of the plunger (521), the plunger (521) is in clearance fit with the return hole (411), and the pusher (410) can push the piston (520) through the top post (522) to open the drain port.

5. The online self-cleaning filter device according to claim 4, characterized in that, The drain cover assembly also includes a fixing seat (540), which is fixed to the inner wall of the drain cylinder (510), and the elastic element (530) is located between the piston (520) and the fixing seat (540).

6. The online self-cleaning filter device according to claim 1, characterized in that, The online self-cleaning filter device also includes a partition (550), which is located between the sewage discharge cylinder (510) and the outer cylinder. The partition (550) has a through hole, which is directly opposite to the sewage discharge port. The inner cylinder passes through the through hole and is connected to the partition (550).

7. The online self-cleaning filter device according to claim 1, characterized in that, The pusher (410) has a groove (412) on the side facing the sewage discharge section. The groove (412) extends along the outer periphery of the pusher (410) and is arranged in a closed loop. And / or, the cleaning assembly further includes a push rod (420), one end of which is connected to the side of the pusher (410) away from the drain section, and the other end extends out of the inner cylinder body; And / or, the inner cylinder includes a first inner cylinder (110) and a second inner cylinder (120), the outer cylinder includes a first outer cylinder (210) and a second outer cylinder (220), the first outer cylinder (210), the second outer cylinder (220) and the drain cylinder (510) are sequentially and sealed together, the first inner cylinder (110), the second inner cylinder (120) and the drain cover assembly are sequentially connected, the liquid inlet is located in the first inner cylinder (110), the filter cylinder (300) is located in the second inner cylinder (120), and the liquid outlet is located in the first outer cylinder (210).

8. The online self-cleaning filter device according to claim 1, characterized in that, The online self-cleaning filter device further includes a first end cap (230), an inlet pipe (111), and an outlet pipe (211). The first end cap (230) is sealed at the end of the outer cylinder and the inner cylinder away from the sewage discharge cylinder (510). The inlet pipe (111) passes through the side wall of the outer cylinder and communicates with the inlet port. The outlet port is located on the side wall of the outer cylinder and communicates with the outlet pipe (211).

9. The online self-cleaning filter device according to claim 8, characterized in that, The online self-cleaning filter also includes a mechanical seal (130) located at the center of the first end cap (230) to mechanically seal the first end cap (230), the outer cylinder, and the inner cylinder.

10. The online self-cleaning filter device according to claim 1, characterized in that, The inner cylinder and the outer cylinder are placed horizontally. The online self-cleaning filter device also includes a base (600), which is vertically set on the ground. The top of the base (600) abuts and supports the bottom of the outer cylinder. The liquid inlet is located at the bottom of the inner cylinder, and the liquid outlet is located at the top of the outer cylinder.

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