Filter screen cleaning device

Abstract

The invention relates to the technical field of filter screen cleaning, in particular to a filter screen cleaning device. The filter screen cleaning device comprises a central pipe, a guide frame and a cleaning frame, the axial first end of the central pipe can be communicated with the water supply pipe, and the axial second end of the central pipe is closed. And the guide frame is arranged on the central pipe and is supported on the inner wall of the filter screen. The water supply pipe is configured to pull the center pipe to move in the axial direction of the filter screen, and the guide frame slides along the inner wall of the filter screen. The cleaning frame comprises a sleeve and a cleaning pipe extending in the radial direction of the sleeve, the sleeve is arranged on the central pipe in a sleeving mode, one end of the cleaning pipe is connected with the sleeve, and the central pipe is communicated with the cleaning pipe through the sleeve. The other end of the cleaning pipe communicates with a flushing head, a water outlet facing the circumferential direction of the sleeve is formed in the periphery of the cleaning pipe, and water flow sprayed out of the water outlet drives the sleeve to rotate in the axial direction of the center pipe. The filter screen does not need to be dismounted from the conveying pipe, dismounting operation of the filter screen is omitted, cleaning of the filter screen under the condition that a core is not pulled is achieved, and the cleaning efficiency of the filter screen is improved.

Description

Technical Field

[0001] The invention relates to the technical field of filter screen cleaning, and in particular to a filter screen cleaning device. Background Art

[0002] In the medium delivery pipe, it is usually necessary to install a filter to filter out foreign matter and impurities that may exist in the medium. After long-term use, the filter needs to be cleaned to avoid clogging.

[0003] At present, the conventional filter cleaning method is to pull the filter out of the pipeline (this process is also called core pulling), then move it to the cleaning area to rinse the filter with water, and finally reinstall the cleaned filter into the delivery pipe. The above filter cleaning method requires disassembly and assembly of the filter, which is complicated to operate and has low cleaning efficiency. Moreover, when the weight of the filter is large, the delivery pipe is located at a high position, or the disassembly and assembly space in the delivery pipe is limited, the difficulty of disassembly and assembly of the filter is further increased, and the cleaning efficiency of the filter is reduced. Summary of the invention

[0004] The object of the present invention is to provide a filter screen cleaning device, which can clean the filter screen without core extraction, thereby improving the cleaning efficiency of the filter screen.

[0005] To achieve this purpose, the technical solution adopted by the present invention is:

[0006] The filter screen cleaning device is used to clean the cylindrical filter screen; the filter screen cleaning device comprises:

[0007] A central tube, wherein a first axial end of the central tube can be communicated with a water supply pipe, and a second axial end of the central tube is closed;

[0008] A guide frame is arranged on the central tube and supported on the inner wall of the filter screen; the water supply pipe is configured to pull the central tube to move along the axial direction of the filter screen, and the guide frame slides along the inner wall of the filter screen;

[0009] A cleaning rack, the cleaning rack comprising a sleeve and a cleaning pipe extending radially along the sleeve, the sleeve being sleeved on the central tube, one end of the cleaning pipe being connected to the sleeve, and the central tube being connected to the cleaning pipe through the sleeve; a flushing head is installed at the other end of the cleaning pipe, a water outlet facing the circumference of the sleeve is opened on the outer periphery of the cleaning pipe, and the water flow sprayed from the water outlet drives the sleeve to rotate around the axial direction of the central tube.

[0010] As an optional solution, the cleaning rack further comprises a nozzle, one end of which is connected and installed at the water outlet, and the other end of the nozzle is provided with a flared opening facing the circumference of the sleeve.

[0011] As an optional solution, at least two cleaning pipes are arranged on the sleeve at equal intervals along the circumferential direction, the nozzles on at least two cleaning pipes are located on the same virtual circle, and the axial direction of the flared opening is parallel to the tangent direction of the virtual circle.

[0012] As an optional solution, the filter cleaning device also includes a mechanical sealing assembly, the center tube is provided with a cache groove along the circumferential direction, the mechanical sealing assembly is sealedly installed at both ends of the cache groove along the axial direction of the center tube, the static ring of the mechanical sealing assembly is seal-connected to the side wall of the cache groove, the sleeve is sleeved in the cache groove and the sealing clamp is arranged on the two dynamic rings of the mechanical sealing assembly.

[0013] As an optional solution, the cache groove, the two moving rings and the inner wall of the sleeve form a cache cavity, and the central tube is connected to the sleeve through the cache cavity.

[0014] As an optional solution, the guide frame includes:

[0015] A shaft sleeve, sleeved on the central tube;

[0016] Support arm, the shaft sleeve is provided with at least two support arms at intervals along the circumferential direction, and one end of the support arm away from the shaft sleeve is supported on the inner wall of the filter screen.

[0017] As an optional solution, a rolling body is rotatably mounted on one end of the support arm away from the sleeve, and the rolling body is supported on the inner wall of the filter screen; when the center tube moves axially along the filter screen, the rolling body slides along the inner wall of the filter screen.

[0018] As an optional solution, the rolling body is a roller, and one end of the support arm away from the sleeve is pivotally connected to the roller.

[0019] As an optional solution, a support plate is provided on the second axial end of the central tube, and a scraper is provided on the support plate. The circumferential edge of the scraper is elastically pressed against the inner wall of the filter screen.

[0020] As an optional solution, the scraper is a rubber ring plate, and the outer ring of the rubber ring plate elastically presses against the inner wall of the filter screen.

[0021] The beneficial effects of the present invention are:

[0022] The filter cleaning device proposed by the present invention has a water supply pipe supplying water to the cleaning pipe of the cleaning rack through the central pipe, a part of the water in the cleaning pipe is sprayed on the inner wall of the filter through the flushing head, and the other part of the water is sprayed out through the water outlet, and the cleaning rack is driven to rotate around the axial direction of the central pipe by the spraying power of the water at the water outlet, so that the foreign matter and impurities on the inner wall of the filter are flushed through the rotating flushing head. At the same time, the central pipe is pulled by the water supply pipe to move along the axial direction of the filter, and the guide frame slides along the inner wall of the filter, so that the flushing head moves from one end of the axial direction of the filter to the other end of the axial direction of the filter, so as to achieve the cleaning operation of the inner wall of the filter. The filter cleaning device of this embodiment directly extends into the interior of the filter, and then the filter cleaning device is pulled by the water supply pipe to move axially in the filter to complete the cleaning of the inner wall of the filter, without removing the filter from the conveying pipe, saving the disassembly and assembly operation when cleaning the filter, realizing the cleaning of the filter without core extraction, and improving the cleaning efficiency of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of a filter screen cleaning device provided by an embodiment of the present invention when cleaning a filter screen;

[0024] Figure 2 1 is a schematic structural diagram of a filter screen cleaning device provided by an embodiment of the present invention when the filter screen is cleaned without a delivery pipe;

[0025] Figure 3 is a schematic structural diagram of a filter screen cleaning device provided by an embodiment of the present invention;

[0026] Figure 4 It is a partial cross-sectional view of a filter cleaning device provided in an embodiment of the present invention.

[0027] The names and numbers of the components in the figure are as follows:

[0028] 10. Delivery pipe; 20. Filter screen;

[0029] 1. Center tube; 11. Buffer slot; 2. Guide frame; 21. Bushing; 22. Support arm; 23. Rolling body; 3. Cleaning frame; 31. Sleeve; 32. Cleaning pipe; 33. Flushing head; 34. Nozzle; 340. Flaring; 4. Mechanical seal assembly; 41. Moving ring; 42. Stationary ring; 5. Support plate; 6. Scraper. DETAILED DESCRIPTION

[0030] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, not all.

[0031] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, the terms "upper", "lower", "right", "left" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0034] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0035] like Figure 1 As shown, in the medium delivery pipe 10, the filter screen 20 is installed in the delivery pipe 10 in a cylindrical shape. The medium is usually water, a flowing chemical solution or a preparation. Figure 1 The medium flows from the inlet end of the delivery pipe 10 into the filter screen 20 in the direction indicated by the middle arrow, is filtered through the mesh of the filter screen 20, and then flows out from the outlet of the delivery pipe 10 to intercept foreign matter and impurities that may exist in the medium through the filter screen 20.

[0036] When the filter 20 is used for a certain period of time or becomes clogged, the filter 20 is pulled out of the pipeline (this process is also called core pulling), and then moved to the cleaning area to rinse the filter 20 with water, and finally the cleaned filter 20 is reinstalled into the delivery pipe 10. The above-mentioned cleaning method of the filter 20 requires the disassembly and assembly of the filter 20, which is complicated to operate and has low cleaning efficiency. Moreover, when the weight of the filter 20 is large, the delivery pipe 10 is located at a high position, or the disassembly and assembly space in the delivery pipe 10 is limited, the difficulty of disassembly and assembly of the filter 20 is further increased, and the cleaning efficiency of the filter 20 is reduced.

[0037] To solve the above problems, Figure 2 and Figure 3 As shown, this embodiment proposes a filter screen cleaning device, which is used to clean a cylindrical filter screen 20. The filter screen cleaning device includes a central tube 1, a guide frame 2 and a cleaning frame 3. The first axial end of the central tube 1 can be connected to the water supply pipe, and the second axial end of the central tube 1 is closed. The guide frame 2 is arranged on the central tube 1 and supported on the inner wall of the filter screen 20. The water supply pipe is configured to pull the central tube 1 to move along the axial direction of the filter screen 20, and the guide frame 2 slides along the inner wall of the filter screen 20. The cleaning frame 3 includes a sleeve 31 and a cleaning pipe 32 extending radially along the sleeve 31. The sleeve 31 is sleeved on the central tube 1, one end of the cleaning pipe 32 is connected to the sleeve 31, and the central tube 1 is connected to the cleaning pipe 32 through the sleeve 31. The other end of the cleaning pipe 32 is connected and installed with a flushing head 33, and the outer periphery of the cleaning pipe 32 is provided with a water outlet facing the circumference of the sleeve 31, and the water flow sprayed from the water outlet drives the sleeve 31 to rotate around the axial direction of the central tube 1.

[0038] In this embodiment, the water supply pipe supplies water to the cleaning pipe 32 of the cleaning rack 3 through the central pipe 1. A part of the water in the cleaning pipe 32 is sprayed on the inner wall of the filter screen 20 through the flushing head 33, and the other part of the water is sprayed out through the water outlet. The power of the water spray at the water outlet is used to drive the cleaning rack 3 to rotate around the axial direction of the central pipe 1, so that the foreign matter and impurities on the inner wall of the filter screen 20 are flushed through the rotating flushing head 33. At the same time, the central pipe 1 is pulled by the water supply pipe to move along the axial direction of the filter screen 20, and the guide frame 2 slides along the inner wall of the filter screen 20, so that the flushing head 33 moves from one end of the axial direction of the filter screen 20 to the other end of the axial direction of the filter screen 20, thereby achieving the cleaning operation of the inner wall of the filter screen 20. The filter cleaning device of the present embodiment directly extends into the interior of the filter 20, and then is pulled by the water supply pipe to move axially in the filter 20 to complete the cleaning of the inner wall of the filter 20. There is no need to remove the filter 20 from the delivery pipe 10, thereby saving the disassembly and assembly operations when cleaning the filter 20, and realizing the cleaning of the filter 20 without core extraction, thereby improving the cleaning efficiency of the filter 20.

[0039] Specifically, the first end of the central tube 1 is threadedly connected to the external water supply pipe to ensure the stability and sealing of the connection between the central tube 1 and the water supply pipe, improve the disassembly and assembly efficiency of the central tube 1 and the water supply pipe, and avoid water leakage during the water supply process.

[0040] like Figure 2 and Figure 3 As shown, the guide frame 2 includes a sleeve 21 and a support arm 22, and the sleeve 21 is sleeved on the center tube 1. The sleeve 21 is provided with at least two support arms 22 at intervals along the circumferential direction, and one end of the support arm 22 away from the sleeve 21 is supported on the inner wall of the filter screen 20. Specifically, the sleeve 21 is threadedly connected to the center tube 1 to achieve a stable installation of the sleeve 21 and the center tube 1. The support arm 22 extends along the radial direction of the sleeve 21, so that the filter screen 20, the center tube 1 and the sleeve 21 are coaxially arranged. The guide frame 2 is supported on the inner wall of the filter screen 20 by at least two support arms 22, so that the guide frame 2 has at least two support points on the inner wall of the filter screen 20, so as to improve the stability of the guide frame 2 supporting the center tube 1, avoid the center tube 1 from tilting or eccentricity when moving along the axial direction of the filter screen 20, and ensure the coaxiality of the center tube 1 and the filter screen 20.

[0041] Specifically, the present embodiment has four support arms 22, and four support arms 22 are evenly spaced on the outer circumference of the sleeve 21, so that the four support arms 22 form a cross-shaped structure, and the guide frame 2 has four support points on the inner wall of the filter screen 20, thereby improving the stability of the guide frame 2. In other embodiments, the number of support arms 22 may be three or more, which is not specifically limited here. In other embodiments, the support arm 22 may also be set as a telescopic arm, and the length of the support arm 22 may be adaptively adjusted according to the inner diameter of the filter screen 20 to ensure that the support arm 22 is adapted to the filter screens 20 of different inner diameters, thereby improving the versatility of the filter screen cleaning device. Since the telescopic structure of the telescopic arm is a prior art, the telescopic structure of the support arm 22 is not described in detail.

[0042] Furthermore, a rolling body 23 is rotatably mounted on one end of the support arm 22 away from the shaft sleeve 21, and the rolling body 23 is supported on the inner wall of the filter screen 20. When the central tube 1 moves along the axial direction of the filter screen 20, the rolling body 23 slides along the inner wall of the filter screen 20. There is rolling friction between the rolling body 23 and the inner wall of the filter screen 20, which reduces the friction between the support arm 22 and the filter screen 20, reduces the pulling resistance of the water supply pipe, and facilitates the filter screen cleaning device to quickly clean the filter screen 20, thereby improving the cleaning efficiency.

[0043] In this embodiment, the rolling body 23 is a roller, and the end of the support arm 22 away from the sleeve 21 is pivotally connected with the roller. The end of the support arm 22 away from the sleeve 21 (i.e., the other end close to the inner wall of the filter screen 20) has a receiving groove, and the roller is installed in the receiving groove by pivoting, and the wheel surface of the roller abuts against the inner wall of the filter screen 20. The guide frame 2 slides on the inner wall of the filter screen 20 through the roller to ensure smooth sliding of the guide frame 2. In other embodiments, the rolling body 23 can also be a sphere or the like.

[0044] like Figure 3 and Figure 4 As shown, the filter screen cleaning device also includes a mechanical seal assembly 4, a buffer groove 11 is opened in the circumferential direction of the central tube 1, and the mechanical seal assembly 4 is sealed and installed at both ends of the buffer groove 11 along the axial direction of the central tube 1, and the static ring 42 of the mechanical seal assembly 4 is sealed and connected to the side wall of the buffer groove 11, and the sleeve 31 is sleeved in the buffer groove 11 and sealed and clamped on the dynamic rings 41 of the two mechanical seal assemblies 4. The sleeve 31 is rotatably installed on the central tube 1 through two mechanical seal assemblies 4, and a static seal is maintained between the static ring 42 and the central axis, a dynamic seal is maintained between the dynamic ring 41 and the static ring 42, and a dynamic seal is maintained between the dynamic ring 41 and the sleeve 31, thereby ensuring the sealing effect between the sleeve 31 and the central tube 1, and avoiding the problem of water leakage at the sleeve 31.

[0045] It should be noted that the above-mentioned mechanical seal assembly 4 includes a dynamic ring 41 (dynamic sealing ring), a static ring 42 (static sealing ring), an auxiliary seal (sealing ring), a clamping member (spring or push ring) and a transmission member (spring seat and key or fixing screw) and other components. Since the mechanical seal assembly 4 is a prior art, the specific structure of the mechanical seal assembly 4 is not repeated here.

[0046] like Figure 4 As shown, the cache groove 11, the two moving rings 41 and the inner wall of the sleeve 31 form a cache cavity, and the central tube 1 is connected to the sleeve 31 through the cache cavity. Specifically, the tube wall of the central tube 1 is provided with a first water-permeable hole connected to the cache cavity, and the water inside the central tube 1 enters the cache cavity through the first water-permeable hole. The sleeve 31 is provided with a plurality of second water-permeable holes connected to the cache cavity along the circumferential direction, and one end of each second water-permeable hole is connected to the cache cavity, and the other end of each second water-permeable hole is connected to the inside of the cleaning pipe 32 in a one-to-one correspondence. After the water from the water supply pipe passes through the central tube 1, the first water-permeable hole, the cache cavity, the second water-permeable hole and the cleaning pipe 32 in sequence, a part of the water is sprayed on the inner wall of the filter screen 20 through the flushing head 33, and the other part of the water is sprayed out through the water outlet, and the cleaning rack 3 is driven to rotate around the axial direction of the central tube 1 by the spraying power of the water at the water outlet.

[0047] Furthermore, if Figure 3As shown, the cleaning rack 3 further includes a nozzle 34, one end of which is connected and installed at the water outlet, and the other end of the nozzle 34 is provided with a flared opening 340 facing the circumference of the sleeve 31. The water at the water outlet is ejected through the flared opening 340, so that the water pressure of the water flow at the nozzle 34 decreases and the kinetic energy increases, thereby converting more of the water pressure at the water outlet into kinetic energy to drive the cleaning rack 3 to rotate, increasing the rotation speed of the cleaning rack 3, and thus improving the cleaning effect of the filter 20.

[0048] Specifically, at least two cleaning pipes 32 are arranged at equal intervals along the circumferential direction of the sleeve 31, and the nozzles 34 on at least two cleaning pipes 32 are located on the same virtual circle, and the axial direction of the flared opening 340 is parallel to the tangent direction of the virtual circle. Since the cleaning pipes 32 are arranged at equal intervals, the dynamic balance of the cleaning rack 3 during the rotation process is ensured, the cleaning rack 3 is prevented from shaking or positional displacement, and the stability of the cleaning rack 3 is improved. At the same time, the direction of the water flow sprayed by each nozzle 34 is parallel to the tangent direction of the virtual circle, so that the driving force provided by each nozzle 34 is parallel to the tangent direction of the virtual circle, so as to ensure the stable rotation of the cleaning pipe 32.

[0049] In this embodiment, the sleeve 31 is provided with five cleaning pipes 32 at equal intervals along the circumferential direction, and the five nozzles 34 are located in the same virtual circle. The inner wall of the filter screen 20 is cleaned by multiple cleaning pipes 32, thereby improving the cleaning effect. In other embodiments, the number of cleaning pipes 32 can also be two, three, four or more than six.

[0050] like Figure 3 As shown, a support plate 5 is provided at the second axial end of the central tube 1, and a scraper 6 is provided on the support plate 5, and the circumferential edge of the scraper 6 is elastically pressed against the inner wall of the filter screen 20. The support plate 5 is in contact with the inner wall of the filter screen 20 through the scraper 6, so that the support plate 5 (scraper 6) and the guide frame 2 jointly support the central tube 1 and the cleaning frame 3 to ensure that the filter screen cleaning device moves stably in the axial direction in the filter screen 20. At the same time, when the scraper 6 moves in the axial direction in the filter screen 20, it can also scrape off the foreign matter and impurities remaining on the inner wall of the filter screen 20 to achieve secondary cleaning and decontamination, thereby improving the cleaning effect of the filter screen 20.

[0051] Furthermore, the scraper 6 is a rubber ring plate, and the outer ring of the rubber ring plate is elastically pressed against the inner wall of the filter screen 20. Specifically, the scraper 6 is a flexible plate, so that the scraper 6 can be elastically deformed to avoid scratching the filter screen 20, and at the same time, the scraper 6 can be tightly pressed against the inner wall of the filter screen 20, thereby improving the scraping ability of the scraper 6, thereby ensuring the secondary cleaning and decontamination effect. The scraper 6 of this embodiment is locked on the support plate 5 by screws, realizing the detachable installation of the scraper 6, and facilitating the disassembly and replacement of the scraper 6.

[0052] The above embodiments are only to illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A filter cleaning device, characterized in that: Used for cleaning a cylindrical filter screen (20); the filter screen cleaning device comprises: A central tube (1), wherein a first axial end of the central tube (1) is capable of being communicated with a water supply pipe, and a second axial end of the central tube (1) is closed; a guide frame (2) arranged on the central tube (1) and supported on the inner wall of the filter screen (20); the water supply pipe is configured to pull the central tube (1) to move along the axial direction of the filter screen (20), and the guide frame (2) slides along the inner wall of the filter screen (20); A cleaning rack (3), the cleaning rack (3) comprising a sleeve (31) and a cleaning pipe (32) extending radially along the sleeve (31), the sleeve (31) being sleeved on the central tube (1), one end of the cleaning pipe (32) being connected to the sleeve (31), the central tube (1) being communicated with the cleaning pipe (32) through the sleeve (31); the other end of the cleaning pipe (32) being connected to a flushing head (33), the outer periphery of the cleaning pipe (32) being provided with a water outlet facing the circumference of the sleeve (31), the water flow sprayed from the water outlet driving the sleeve (31) to rotate around the axial direction of the central tube (1).

2. The filter screen cleaning device according to claim 1, characterized in that: The cleaning rack (3) further comprises a nozzle (34), one end of which is connected and installed at the water outlet, and the other end of which is provided with a flared opening (340) facing the circumference of the sleeve (31).

3. The filter screen cleaning device according to claim 2, characterized in that: The sleeve (31) is provided with at least two cleaning pipes (32) at equal intervals along the circumferential direction, the nozzles (34) on at least two cleaning pipes (32) are located on the same virtual circle, and the axial direction of the flared opening (340) is parallel to the tangent direction of the virtual circle.

4. The filter screen cleaning device according to claim 1, characterized in that: The filter cleaning device also includes a mechanical sealing assembly (4), the central tube (1) is provided with a buffer groove (11) along the circumferential direction, the buffer groove (11) is sealed with the mechanical sealing assembly (4) at both ends along the axial direction of the central tube (1), the static ring (42) of the mechanical sealing assembly (4) is sealed and connected to the side wall of the buffer groove (11), the sleeve (31) is sleeved in the buffer groove (11) and the sealing clamp is arranged on the two dynamic rings (41) of the mechanical sealing assembly (4).

5. The filter screen cleaning device according to claim 4, characterized in that: The cache groove (11), the two movable rings (41) and the inner wall of the sleeve (31) form a cache cavity, and the central tube (1) is connected to the sleeve (31) through the cache cavity.

6. The filter screen cleaning device according to any one of claims 1 to 5, characterized in that: The guide frame (2) comprises: A shaft sleeve (21) is sleeved on the central tube (1); A support arm (22), wherein the shaft sleeve (21) is provided with at least two support arms (22) spaced apart along the circumferential direction, and one end of the support arm (22) away from the shaft sleeve (21) is supported on the inner wall of the filter screen (20).

7. The filter screen cleaning device according to claim 6, characterized in that: A rolling body (23) is rotatably mounted on one end of the support arm (22) away from the shaft sleeve (21), and the rolling body (23) is supported on the inner wall of the filter screen (20); when the central tube (1) moves along the axial direction of the filter screen (20), the rolling body (23) slides along the inner wall of the filter screen (20).

8. The filter screen cleaning device according to claim 7, characterized in that: The rolling body (23) is a roller, and one end of the support arm (22) away from the shaft sleeve (21) is pivotally connected to the roller.

9. The filter screen cleaning device according to any one of claims 1 to 5, characterized in that: A support plate (5) is provided at the second axial end of the central tube (1), a scraper (6) is provided on the support plate (5), and the circumferential edge of the scraper (6) is elastically pressed against the inner wall of the filter screen (20).

10. The filter screen cleaning device according to claim 9, characterized in that: The scraper (6) is a rubber ring plate, and the outer ring of the rubber ring plate elastically presses against the inner wall of the filter screen (20).

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