A security filter cartridge backwash recycling device

Abstract

The utility model discloses a security filter filter element back flush reuse device relates to back flush reuse device technical field, including platform, filter structure and fixed structure, first, make the two electric push rods of fixed frame top synchronous stretch out, push both sides clamping plate to the middle movement, the inside protection soft board of flexible clamping is carried out to filter outer wall, subsequently, stretch telescopic fixed band, make the clamping block embed in the card slot, the convex button in the clamping block is under the spring effect and is clamped into the connecting groove, and this double locking design not only can bear the high pressure water flow impact in back flush process, still possess quick dismounting function, through the starting of washing water pump, at this moment, can choose different pipeline washing mode according to actual demand, one, open second control valve on the second shunt pipe, and the reverse osmosis water production flows into the first water holding chamber of filter element back flush water tank through the water inlet pipe, under the effect of washing water pump, through second shunt pipe into the filter, thereby carries out the powerful washing to filter core.

Description

Technical Field

[0001] This utility model relates to the technical field of backwashing and reuse devices, specifically a backwashing and reuse device for a security filter element. Background Technology

[0002] Security filter cartridges are filter media made from non-toxic and odorless polypropylene through heating, melting, spraying, drawing, and receiving molding. These PP cartridges have a deep filtration structure with uniform pore size and a loose outer layer and dense inner layer, exhibiting high filtration efficiency and excellent acid and alkali resistance. They effectively remove suspended solids, particles, rust, and other impurities from water and are commonly used in the front-end security filters of reverse osmosis units in water treatment. They are the core filtration component of these front-end security filters. However, existing cartridges are disposable consumables, easily clogging due to fluctuations in incoming water quality. Replacement is required when the pressure difference exceeds 0.1 MPa, resulting in short lifespan, frequent replacements, and high consumption. This not only increases the operating costs of water treatment but also generates a large amount of solid waste, raising disposal costs. Therefore, those skilled in the art have developed a backwashing and reuse device for security filter cartridges to address the problems mentioned in the background. Utility Model Content

[0003] The purpose of this invention is to provide a backwashing and reuse device for a security filter element, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A security filter cartridge backwashing and reuse device includes a platform, a filter structure, and a fixing structure. A connecting plate is fixedly connected to one side of the top of the platform, and a fixing structure is fixedly connected to one side of the top of the connecting plate. Support plates are fixedly connected to both sides of the bottom of the platform. A base plate is fixedly connected between the two support plates at the bottom. A filter cartridge backwashing water tank is fixedly connected to the top center of the base plate. A sliding groove is opened on the inner side wall of the filter cartridge backwashing water tank. Sealing rings are fixedly connected to both sides of the inner wall of the sliding groove. A filter structure is slidably connected in the sliding groove.

[0006] As a further embodiment of this utility model: the filter structure includes a fixed frame, an activated carbon plate, a handle, a secondary filter plate, bolts, nuts, and a primary filter plate. The fixed frame is slidably connected to the slide groove. A handle is fixedly connected to the middle of one side of the fixed frame. An installation frame is fixedly connected inside the fixed frame. An activated carbon plate is placed on one side of the installation frame. The primary filter plate and the secondary filter plate are placed sequentially from the outside to the inside on the other side of the installation frame. The four corners of the primary filter plate, the secondary filter plate, and the activated carbon plate are all connected to the installation frame by bolts. The bolts pass through the primary filter plate, the secondary filter plate, the installation frame, and the activated carbon plate in sequence. Nuts are threaded onto the bolts, the outer ends of the primary filter plate, and the activated carbon plate.

[0007] As a further embodiment of this utility model: the fixing structure includes a fixing frame, an electric push rod, a connecting groove, a slot, a raised button, a locking block, a telescopic fixing strap, a clamping plate, and a protective soft plate. Two electric push rods are fixedly connected to one side of the fixing frame, and the other side of the electric push rods are connected through the clamping plate. A clamping groove is formed between the two clamping plates, and a protective soft plate is fixedly connected to the inner wall of each clamping plate. Two telescopic fixing straps are fixedly connected to the top of one clamping plate.

[0008] As a further improvement of this utility model: the telescopic fixing strap is fixedly connected to a locking block on the side away from the clamping plate, and a raised button is movably connected to one side of the locking block by a spring. Two connecting blocks are fixedly connected to the top of the clamping plate on the other side. The top of the connecting blocks is provided with a slot corresponding to the locking block, and a connecting groove is provided on one side of the slot corresponding to the raised button. The connecting groove is snapped to the raised button, and the slot is embedded in the locking block.

[0009] As a further embodiment of this utility model: a partition plate is fixedly connected inside the filter element backwash water tank. A first water-holding cavity is opened on one side of the partition plate, and a second water-holding cavity is opened on the other side of the partition plate. A placement frame is slidably connected to the bottom wall and one side of the slide groove of the second water-holding cavity. A lockable cabinet door is hinged to one edge of the second water-holding cavity. Two drain pipes are fixedly connected to the lower part of one side of the filter element backwash water tank, and a drain valve is fixedly connected to each drain pipe.

[0010] As a further embodiment of this utility model: an inlet pipe is fixedly connected to the upper part of one side of the filter element backwash water tank, and an inlet valve is fixedly connected to the inlet pipe. The drain pipe and the inlet pipe on one side pass through one side of the filter element backwash water tank and extend into the first water-holding chamber. The drain pipe on the other side passes through one side of the filter element backwash water tank and extends into the second water-holding chamber.

[0011] As a further embodiment of this utility model: a flushing water pump is installed on one side of the filter element backwash water tank and the top of the base plate. The flushing water pump is connected to the filter element backwash water tank through a connecting pipe. A delivery pipe is fixedly connected to the other side of the flushing water pump. A first control valve is fixedly connected to both the delivery pipe and the connecting pipe. The side of the delivery pipe away from the flushing water pump passes through the platform and the connecting plate and is threadedly connected to a filter. The filter is located between two clamping plates on the fixed structure.

[0012] As a further embodiment of this utility model: the filter is threadedly connected to a second diversion pipe on the side away from the delivery pipe, and a first diversion pipe is fixedly connected to one side of the second diversion pipe. A second control valve is fixedly connected to both the first and second diversion pipes. The bottom of the first diversion pipe passes through the platform and the filter element backwash water tank on one side and extends into the second water chamber. The bottom of the second diversion pipe passes through the platform and the filter element backwash water tank on one side and extends into the first water chamber. An exhaust pipe is fixedly connected to one side of the top of the filter, and an exhaust valve is fixedly connected to the exhaust pipe.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. In use, firstly, extend the two electric push rods at the top of the fixing frame simultaneously, pushing the clamping plates on both sides to move towards the middle. The inner protective soft plate fits against the outer wall of the filter for flexible clamping, which not only prevents rigid contact from damaging the equipment, but also allows for adaptive adjustment of the clamping force according to the size of the filter. Then, stretch the telescopic fixing strap at the top of one clamping plate, so that the locking block is embedded in the slot at the top of the connecting block of the other clamping plate. The protruding button inside the locking block is engaged in the connecting slot under the action of the spring, forming a mechanical buckle lock. This double locking design can not only withstand the impact of high-pressure water flow during backwashing, but also has a quick disassembly function, which facilitates the replacement or maintenance of the filter and effectively reduces the maintenance cost of the equipment.

[0015] 2. Then start the flushing water pump. At this time, different pipeline flushing methods can be selected according to actual needs. First, open the second control valve on the second diversion pipe. The reverse osmosis permeate flows into the first water chamber of the filter cartridge backwash water tank through the inlet pipe. Under the action of the flushing water pump, it directly enters the filter through the second diversion pipe, thereby powerfully flushing the filter cartridge and quickly removing pollutants from the surface and pores of the filter cartridge. The wastewater generated by backwashing flows into the flushing water pump through the conveying pipe and is then transported to the second water chamber through the connecting pipe.

[0016] 3. At this point, when sewage flows into the second water chamber, it first passes through the primary filter plate to intercept suspended particles and flocculent matter. Then, the water flows through the secondary filter plate to further capture fine impurities. Finally, the water flows into the activated carbon plate, which adsorbs residual chlorine, organic matter, and other odor sources. At the same time, the antibacterial components inhibit the growth of microorganisms, achieving deep purification. The precipitated impurities fall into the placement frame and can be treated by opening the lockable cabinet door. When maintenance is required, the operator only needs to hold the handle and pull the fixed frame out along the slide to expose the internal filter components. Since the primary filter plate, secondary filter plate, and activated carbon plate are independently fixed to the mounting frame with bolts and nuts, any one of the plates can be disassembled and replaced individually, thus ensuring that the filtration effect is always maintained at its best.

[0017] 4. Secondly, open the second control valve on the first diversion pipe. At this time, the flushing water pump draws the purified water from the second water chamber out of the first diversion pipe and then sends it into the filter through the second diversion pipe to clean the filter element, thereby removing residual impurities. The cleaned water flows back to the second water chamber through the delivery pipe, flushing water pump and connecting pipe, thus forming a circulating flush. When it is necessary to discharge wastewater, open the drain valve on the corresponding drain pipe and the sewage can be discharged from the drain pipe. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a backwashing and reuse device for a security filter cartridge.

[0019] Figure 2 This is a schematic diagram of the platform connection structure in a backwashing and reuse device for a security filter cartridge.

[0020] Figure 3 This is a schematic diagram of the connection structure of the filter cartridge backwashing water tank in a security filter cartridge backwashing and reuse device.

[0021] Figure 4 This is a schematic diagram of the internal structure of the filter cartridge backwashing water tank in a security filter cartridge backwashing and reuse device.

[0022] Figure 5 This is a schematic diagram of the filtration structure in a backwashing and reuse device for a security filter cartridge.

[0023] Figure 6 This is a schematic diagram of the fixed structure in a backwashing and reuse device for a security filter cartridge.

[0024] In the diagram: 1. Platform; 2. Support plate; 3. Base plate; 4. Filter cartridge backwash water tank; 5. Filtration structure; 51. Fixing frame; 52. Activated carbon plate; 53. Handle; 54. Secondary filter plate; 55. Bolt; 56. Nut; 57. Primary filter plate; 6. Fixing structure; 61. Fixing bracket; 62. Electric push rod; 63. Connecting groove; 64. Card slot; 65. Raised button; 66. Locking block; 67. Telescopic fixing strap; 68. Clamping plate; 69. Protective soft 7. Cabinet door with lock; 8. Flushing water pump; 9. Filter; 10. Connecting plate; 11. Drain pipe; 12. Drain valve; 13. Inlet valve; 14. Inlet pipe; 15. Connecting pipe; 16. First control valve; 17. First diversion pipe; 18. Second control valve; 19. Second diversion pipe; 20. Exhaust valve; 21. Exhaust pipe; 22. Conveying pipe; 23. Divider plate; 24. Placement frame; 25. Slide chute; 26. First water chamber; 27. Second water chamber. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Example 1

[0027] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6This embodiment provides a backwashing and reuse device for a security filter cartridge, including a platform 1, a filter structure 5, and a fixing structure 6. A connecting plate 10 is fixedly connected to one side of the top of the platform 1, and the fixing structure 6 is fixedly connected to one side of the top of the connecting plate 10. Support plates 2 are fixedly connected to both sides of the bottom of the platform 1. A bottom plate 3 is fixedly connected between the two support plates 2. A filter cartridge backwashing water tank 4 is fixedly connected to the top center of the bottom plate 3. A sliding groove 25 is formed on the inner side wall of the filter cartridge backwashing water tank 4. Sealing rings are fixedly connected to both sides of the inner wall of the sliding groove 25. The filter structure 5 is slidably connected inside the sliding groove 25. A partition plate 23 is fixedly connected inside the filter cartridge backwashing water tank 4. A first water-holding chamber 26 is provided on one side of the partition plate 23, and a second water-holding chamber 27 is provided on the other side. A placement frame 24 is slidably connected to the bottom wall and one side of the slide groove 25 of the second water-holding chamber 27. A lockable cabinet door 7 is hinged to one edge of the second water-holding chamber 27. Two drain pipes 11 are fixedly connected to the lower part of one side of the filter element backwash water tank 4, and drain valves 12 are fixedly connected to each drain pipe 11. An inlet pipe 14 is fixedly connected to the upper part of one side of the filter element backwash water tank 4, and an inlet valve 13 is fixedly connected to the inlet pipe 14. The drain pipe 11 and the inlet pipe 14 on one side pass through one side of the filter element backwash water tank 4 and extend into the first water-holding chamber 26. The drain pipe 11 on the other side passes through the first water-holding chamber 26. A filter element backwash water tank 4 extends to one side and into the second water chamber 27. A flushing water pump 8 is installed on one side of the filter element backwash water tank 4 and on the top of the base plate 3. The flushing water pump 8 is connected to the filter element backwash water tank 4 via a connecting pipe 15. A delivery pipe 22 is fixedly connected to the other side of the flushing water pump 8. A first control valve 16 is fixedly connected to both the delivery pipe 22 and the connecting pipe 15. The side of the delivery pipe 22 away from the flushing water pump 8 passes through the platform 1 and the connecting plate 10 and is threadedly connected to a filter 9. The filter 9 is located between two clamping plates 68 on the fixed structure 6. A second diversion pipe 19 is threadedly connected to the side of the filter 9 away from the delivery pipe 22. A first diversion pipe 17 is fixedly connected to one side of filter 9, and a second control valve 18 is fixedly connected to both the first diversion pipe 17 and the second diversion pipe 19. The bottom of the first diversion pipe 17 passes through the platform 1 and the filter element backwash water tank 4 and extends into the second water chamber 27. The bottom of the second diversion pipe 19 passes through the platform 1 and the filter element backwash water tank 4 and extends into the first water chamber 26. An exhaust pipe 21 is fixedly connected to one side of the top of filter 9, and an exhaust valve 20 is fixedly connected to the exhaust pipe 21. When the second control valve 18 on the second diversion pipe 19 is opened, the reverse osmosis permeate flows into the first water chamber 26 of the filter element backwash water tank 4 through the inlet pipe 14. Under the action of the flushing water pump 8, it directly enters the filter 9 through the second diversion pipe 19, thereby powerfully flushing the filter element and quickly removing pollutants from the surface and pores of the filter element. The wastewater generated by backwashing flows into the flushing water pump 8 through the conveying pipe 22 and is then transported to the second water chamber 27 through the connecting pipe 15.Open the second control valve 18 on the first diversion pipe 17. At this time, the flushing water pump 8 draws the purified water from the second water chamber 27 out of the first diversion pipe 17, and then sends it through the second diversion pipe 19 into the filter 9 to clean the filter element, thereby removing residual impurities. The cleaned water flows back to the second water chamber 27 through the delivery pipe 22, the flushing water pump 8, and the connecting pipe 15, thus forming a circulating flush. When wastewater needs to be discharged, open the drain valve 12 on the corresponding drain pipe 11, and the sewage can be discharged from the drain pipe 11.

[0028] Example 2

[0029] Reference Figure 5-6This embodiment is based on the previous embodiment, but differs in that the filter structure 5 includes a fixed frame 51, an activated carbon plate 52, a handle 53, a secondary filter plate 54, bolts 55, nuts 56, and a primary filter plate 57. The fixed frame 51 is slidably connected to the slide groove 25. A handle 53 is fixedly connected to the middle of one side of the fixed frame 51. A mounting frame is fixedly connected inside the fixed frame 51. An activated carbon plate 52 is placed on one side of the mounting frame, and a primary filter plate 57 and a secondary filter plate 54 are placed sequentially from the outside to the inside on the other side of the mounting frame. The four corners of the primary filter plate 57, the secondary filter plate 54, and the activated carbon plate 52 are all connected to the mounting frame by bolts 55. The bolts 55 pass through the primary filter plate 57, the secondary filter plate 54, the mounting frame, and the activated carbon plate 52 in sequence, and the bolts 55 are attached to the primary filter plate 57 and the activated carbon plate 52. Each side end is threaded with a nut 56. When sewage flows into the second water chamber 27, it first passes through the primary filter plate 57 to intercept suspended particles and flocculent matter. Then, the water flows through the secondary filter plate 54 to further capture fine impurities. Finally, the water flows into the activated carbon plate 52, which adsorbs residual chlorine, organic matter, and other odor sources. At the same time, the antibacterial components inhibit the growth of microorganisms, achieving deep purification. The precipitated impurities fall into the placement frame 24 and can be treated by opening the lockable cabinet door 7. When maintenance is required, the operator only needs to hold the handle 53 to pull out the fixing frame 51 along the slide 25 to expose the internal filter components. Since the primary filter plate 57, the secondary filter plate 54, and the activated carbon plate 52 are independently fixed to the mounting frame by bolts 55 and nuts 56, any plate can be disassembled and replaced individually, so that the filtration effect is always maintained at the best level.The fixing structure 6 includes a fixing frame 61, electric push rods 62, connecting grooves 63, slots 64, raised buttons 65, locking blocks 66, telescopic fixing straps 67, clamping plates 68, and protective flexible plates 69. Two electric push rods 62 are fixedly connected to one side of the fixing frame 61, and the other side of each electric push rod 62 is connected via clamping plates 68. A clamping groove is formed between the two clamping plates 68, and protective flexible plates 69 are fixedly connected to their inner walls. Two telescopic fixing straps 67 are fixedly connected to the top of one clamping plate 68. Locking blocks 66 are fixedly connected to the side of each telescopic fixing strap 67 away from the clamping plate 68. Raised buttons 65 are movably connected to one side of each locking block 66 via springs. Two connecting blocks are fixedly connected to the top of the other clamping plate 68. Each connecting block has a locking groove 64 corresponding to the locking block 66. 4. Each side has a connecting groove 63 corresponding to the raised button 65, and the connecting groove 63 is snapped into the raised button 65. The slot 64 is embedded into the locking block 66. First, the two electric push rods 62 extend synchronously, pushing the clamping plates 68 on both sides to move towards the middle. The inner protective soft plate 69 fits against the outer wall of the filter 9 for flexible clamping, which not only prevents rigid contact damage to the equipment, but also adaptively adjusts the clamping force according to the filter size. Then, the telescopic fixing strap 67 is stretched, so that the locking block 66 is embedded in the slot 64. The raised button 65 in the locking block 66 is snapped into the connecting groove 63 under the action of the spring, forming a mechanical snap lock. This double locking design can not only withstand the impact of high-pressure water flow during backwashing, but also has a quick disassembly function, which facilitates the replacement or maintenance of the filter 9 and effectively reduces the maintenance cost of the equipment.

[0030] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0031] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A backwashing and reuse device for a security filter cartridge, comprising a platform (1), a filtration structure (5), and a fixing structure (6), characterized in that, A connecting plate (10) is fixedly connected to one side of the top of the platform (1), and a fixing structure (6) is fixedly connected to one side of the top of the connecting plate (10). Support plates (2) are fixedly connected to both sides of the bottom of the platform (1). A bottom plate (3) is fixedly connected between the two support plates (2). A filter element backwash water tank (4) is fixedly connected to the top center of the bottom plate (3). A sliding groove (25) is opened on the inner side wall of the filter element backwash water tank (4). Sealing rings are fixedly connected to both sides of the inner wall of the sliding groove (25). A filter structure (5) is slidably connected inside the sliding groove (25).

2. The backwashing and reuse device for a security filter element according to claim 1, characterized in that, The filter structure (5) includes a fixed frame (51), an activated carbon plate (52), a handle (53), a secondary filter plate (54), bolts (55), nuts (56), and a primary filter plate (57). The fixed frame (51) is slidably connected to the slide groove (25). A handle (53) is fixedly connected to the middle of one side of the fixed frame (51). An installation frame is fixedly connected inside the fixed frame (51). An activated carbon plate (52) is placed on one side of the installation frame. A primary filter plate (57) and a secondary filter plate (54) are placed sequentially from the outside to the inside on the other side of the installation frame. The four corners of the primary filter plate (57), the secondary filter plate (54), and the activated carbon plate (52) are all connected to the installation frame by bolts (55). The bolts (55) pass through the primary filter plate (57), the secondary filter plate (54), the installation frame, and the activated carbon plate (52) in sequence. Nuts (56) are threaded onto the bolts (55), the outer ends of the primary filter plate (57), and the activated carbon plate (52).

3. The backwashing and reuse device for a security filter element according to claim 1, characterized in that, The fixing structure (6) includes a fixing frame (61), an electric push rod (62), a connecting groove (63), a slot (64), a raised button (65), a locking block (66), a telescopic fixing strap (67), a clamping plate (68), and a protective soft plate (69). Two electric push rods (62) are fixedly connected to one side of the fixing frame (61), and the other side of the electric push rods (62) are connected through the clamping plate (68). A clamping groove is formed between the two clamping plates (68), and a protective soft plate (69) is fixedly connected to the inner side wall of each clamping plate (68). Two telescopic fixing straps (67) are fixedly connected to the top of one clamping plate (68).

4. A backwashing and reuse device for a security filter element according to claim 3, characterized in that, The telescopic fixing strap (67) is fixedly connected to a locking block (66) on the side away from the clamping plate (68). A raised button (65) is movably connected to one side of the locking block (66) via a spring. Two connecting blocks are fixedly connected to the top of the clamping plate (68) on the other side. Each connecting block has a slot (64) on its top that corresponds to the locking block (66). Each slot (64) has a connecting groove (63) on one side that corresponds to the raised button (65). The connecting groove (63) is snapped to the raised button (65), and the slot (64) is embedded to the locking block (66).

5. A backwashing and reuse device for a security filter element according to claim 1, characterized in that, The filter cartridge backwash water tank (4) is fixedly connected to a partition plate (23). A first water chamber (26) is opened on one side of the partition plate (23), and a second water chamber (27) is opened on the other side of the partition plate (23). A placement frame (24) is slidably connected to the bottom wall and the side of the slide groove (25) of the second water chamber (27). A lockable cabinet door (7) is hinged at the edge of one side of the second water chamber (27). Two drain pipes (11) are fixedly connected to the lower part of one side of the filter cartridge backwash water tank (4), and a drain valve (12) is fixedly connected to each drain pipe (11).

6. A backwashing and reuse device for a security filter element according to claim 1, characterized in that, The filter element backwash water tank (4) is fixedly connected to an inlet pipe (14) on one side. An inlet valve (13) is fixedly connected to the inlet pipe (14). The drain pipe (11) and the inlet pipe (14) on one side pass through one side of the filter element backwash water tank (4) and extend into the first water chamber (26). The drain pipe (11) on the other side passes through one side of the filter element backwash water tank (4) and extends into the second water chamber (27).

7. A backwashing and reuse device for a security filter element according to claim 1, characterized in that, A flushing water pump (8) is installed on one side of the filter element backwash water tank (4) and on the top of the base plate (3). The flushing water pump (8) is connected to the filter element backwash water tank (4) through a connecting pipe (15). A delivery pipe (22) is fixedly connected to the other side of the flushing water pump (8). A first control valve (16) is fixedly connected to both the delivery pipe (22) and the connecting pipe (15). The side of the delivery pipe (22) away from the flushing water pump (8) passes through the platform (1) and the side of the connecting plate (10) and is threadedly connected to a filter (9). The filter (9) is located between two clamping plates (68) on the fixed structure (6).

8. A backwashing and reuse device for a security filter element according to claim 7, characterized in that, The filter (9) is threadedly connected to a second diversion pipe (19) on the side away from the delivery pipe (22). A first diversion pipe (17) is fixedly connected to one side of the second diversion pipe (19). A second control valve (18) is fixedly connected to both the first diversion pipe (17) and the second diversion pipe (19). The bottom of the first diversion pipe (17) passes through one side of the platform (1) and the filter element backwash water tank (4) and extends into the second water chamber (27). The bottom of the second diversion pipe (19) passes through one side of the platform (1) and the filter element backwash water tank (4) and extends into the first water chamber (26). An exhaust pipe (21) is fixedly connected to one side of the top of the filter (9). An exhaust valve (20) is fixedly connected to the exhaust pipe (21).

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