Multi-stage filter device for water tank

Abstract

The utility model discloses a kind of pool multistage filter devices, to solve the filter inside installation is the filter core of single material, the insufficient of poor filtering effect. The utility model includes a reversing valve and several filter units, the flow path of several filter units is connected together, filter unit is loaded filter material, water flow is filtered in turn through the filter material in several filter units;The flow direction of water flow is switched by the reversing valve. The pool multistage filter device of the application is filtered by multistage, improves filtering effect, and is conducive to prolonging the service life of filter material.

Description

Technical Field

[0001] This utility model relates to water tank supporting equipment, and more specifically, it relates to a multi-stage filtration device for water tanks. Background Technology

[0002] Filters are common accessories for water tanks, allowing water to circulate after filtration and ensuring water quality. Many filter media are available, such as fiber balls, filter sand, and glass filter media, each with different filtration effects. However, existing filters typically use only a single filter material, resulting in suboptimal filtration. Chinese patent application number 2018115783888 discloses a filter that achieves upstream venting through an upstream vent communicating with the space between the outer periphery of the filter element and the inner wall of the cylinder, and downstream venting through a downstream vent communicating with the upper interface at the top of the filter element and the internal fluid of the filter element, thus providing better venting performance. However, this filter uses a single-material filter element, resulting in insufficient filtration efficiency. Utility Model Content

[0003] To overcome the above shortcomings, this utility model provides a multi-stage filtration device for water tanks. Through multi-stage filtration, the filtration effect is improved and the service life of the filter media is extended.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a multi-stage filtration device for a water tank, including a reversing valve and several filtration units, the flow paths of the several filtration units are connected in series, the filtration units are loaded with filter media, and the water flows through the filter media in the several filtration units in sequence to achieve filtration; the reversing valve reverses and switches the flow direction of the water.

[0005] Water flows sequentially through several filtration units, where filter media filters the water in turn, greatly improving the filtration effect. Using different filter media allows for different filtration performances, thereby enhancing filtration efficiency and extending the lifespan of the filter media. The reversing valve can switch the direction of water flow, enabling different operating modes such as filtration, backwashing, and flow interception, offering flexibility and convenience.

[0006] The multi-stage filtration device for water tanks in this application improves the filtration effect through multi-stage filtration, which helps to extend the service life of the filter media.

[0007] Preferably, the filtration units include a primary filtration unit and a secondary filtration unit. The primary filtration unit contains primary filter media, and the secondary filtration unit contains secondary filter media. The primary filter media is filter sand or glass filter media, and the secondary filter media is fiber balls.

[0008] Filter sand has a relatively low filtration precision, typically around 5-20 micrometers; glass filter media is used in the same way as filter sand, with a filtration precision of 1-20 micrometers. Filter sand mainly traps impurities through the gaps between particles and the contact surface, and its pores are relatively large. Filter sand has advantages such as high mechanical strength, good chemical stability, and low price, and is widely used in some water treatment scenarios where the filtration precision requirements are not particularly high.

[0009] Fiber balls offer relatively high filtration precision, effectively removing suspended solids, colloids, organic matter, and other impurities from water, with a filtration accuracy of 1-5 microns. Because fiber balls possess a large specific surface area, high porosity, and strong adsorption capacity, the fiber filaments form a three-dimensional filtration layer in the water, effectively trapping and adsorbing impurities.

[0010] Preferably, the primary filtration unit includes a filter cartridge and a core tube, with the lower end of the core tube extending to the bottom of the filter cartridge, and the primary filter media loaded in the filter cartridge.

[0011] When the primary filtration unit filters the water flow, the water flow is delivered from the top of the filter cartridge into the filter cartridge, filtered by the primary filter media, and then delivered from the bottom of the core tube into the core tube, and output from the top of the core tube into the secondary filtration unit.

[0012] As a preferred option, several horizontally arranged flow tubes are installed at the lower part of the core tube, and the flow tubes are densely covered with several filter holes.

[0013] The horizontally arranged flow pipes increase the range and area through which water flows, which is beneficial for water to be transported from the primary filter media to the core tube.

[0014] Preferably, the bottom of the core tube is connected to a mounting base, which is supported at the bottom of the filter cartridge. The mounting base has several insertion holes spaced circumferentially, and the flow tube is inserted into the insertion holes.

[0015] The mounting base enables a reliable connection between the core tube and the flow tube, while the mounting base supports the bottom of the filter cartridge, ensuring the reliable installation of the entire core tube.

[0016] Preferably, the reversing valve is provided with an inlet, an outlet, and a drain outlet. The reversing valve is provided with an installation cavity and a flow sleeve. A rotating reversing disk is installed in the installation cavity. A baffle is provided at the bottom of the installation cavity to form an inlet baffle, an outlet baffle, a flow baffle, a barrier cavity, and a drain baffle. The reversing disk is provided with a flow notch and a flow channel. The inlet and the flow notch are connected. The outlet and the outlet baffle are connected. The drain outlet and the drain baffle are connected. The inlet baffle is connected to the inlet end of the primary filter unit. The flow baffle and the flow sleeve are connected.

[0017] The direction of water flow is switched by rotating the reversing disc. The inlet is always connected to the flow passage notch, which, when rotated, connects to the inlet baffle, outlet baffle, flow passage baffle, barrier chamber, and drain baffle. During normal filtration, the flow passage notch connects to the inlet baffle, and the flow passage settling tank connects to the outlet baffle and flow passage baffle. During backwashing, the flow passage notch connects to the flow passage baffle, and the flow passage settling tank connects to the inlet baffle and drain baffle. During flow interception, the flow passage notch connects to the barrier chamber.

[0018] In the first scheme, the reversing valve is installed at the top of the primary filtration unit. The secondary filtration unit includes a filter tank and an outlet channel. The secondary filter media is loaded in the filter tank. One end of the outlet channel extends to the bottom of the filter tank, and the other end extends to the outside of the filter tank. The opening at the top of the filter tank is connected to the outlet of the primary filtration unit through a pipe and the reversing valve.

[0019] In this scheme, after being filtered by the primary filtration unit, the water flows through the reversing valve and the pipeline into the filter tank of the secondary filtration unit from the opening at the top of the filter tank. After being filtered by the secondary filter media in the filter tank, the water is transported to the outlet channel and then transported outward from the opening at the top of the outlet channel.

[0020] In the second scheme, the reversing valve is installed at the top of the primary filtration unit. The secondary filtration unit includes a filter bottle, in which the secondary filter media is loaded. The filter bottle has an inlet at the top and an outlet at the bottom. The inlet is connected to the outlet of the primary filtration unit through a pipe and the reversing valve.

[0021] In this scheme, after being filtered by the primary filtration unit, the water flows through the reversing valve and the pipeline from the inlet at the top of the filter bottle into the filter bottle of the secondary filtration unit. After being filtered by the secondary filter media in the filter bottle, the water is transported outward from the outlet at the bottom of the filter bottle.

[0022] In the third scheme, the secondary filter unit is installed between the reversing valve and the primary filter unit. The secondary filter unit includes several circumferentially spaced flow tubes. An inlet pipe is installed inside the flow tube. The secondary filter material is loaded in the flow tube. One end of the inlet pipe extends to the bottom of the flow tube, and the other end of the inlet pipe is connected to the reversing valve. The flow tube is connected to the outlet end of the primary filter unit.

[0023] In this design, the secondary filtration unit is directly installed between the reversing valve and the primary filtration unit to form an integrated structure. After being filtered by the primary filtration unit, the water flows into the flow tube, is filtered by the secondary filter media in the flow tube, and is then transported to the inlet pipe and discharged outward after passing through the reversing valve.

[0024] Compared with the prior art, the beneficial effects of this utility model are: (1) The multi-stage filtration device of this application improves the filtration effect through multi-stage filtration, which is conducive to extending the service life of the filter material; (2) The filtration unit uses different filter materials for filtration, giving full play to different filtration performance, thereby improving the filtration effect and extending the service life of the filter material; (3) The water flow direction is switched by rotating the reversing plate, thereby realizing different working modes such as water filtration, backwashing, and interception, which is flexible and convenient. Attached Figure Description

[0025] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention.

[0026] Figure 2 This is a cross-sectional view of Embodiment 1 of this utility model.

[0027] Figure 3 This is a cross-sectional view of the primary filter unit in embodiments 1 and 2 of this utility model.

[0028] Figure 4 This is an exploded view of the reversing valve of this utility model.

[0029] Figure 5 This is a structural schematic diagram of Embodiment 2 of this utility model.

[0030] Figure 6 This is a cross-sectional view of Embodiment 2 of this utility model.

[0031] Figure 7 This is a structural schematic diagram of Embodiment 3 of this utility model.

[0032] Figure 8 This is a cross-sectional view of Embodiment 3 of this utility model.

[0033] Figure 9 This is a cross-sectional view of Embodiment 3 of this utility model from another direction.

[0034] In the diagram: 1. Reversing valve; 2. Primary filter unit; 3. Secondary filter unit; 4. Primary filter media; 5. Secondary filter media; 6. Filter cartridge; 7. Core tube; 8. Flow tube; 9. Mounting base; 10. Positioning boss; 11. Liquid inlet; 12. Liquid outlet; 13. Drain outlet; 14. Mounting cavity; 15. Flow sleeve; 16. Reversing plate; 17. Liquid inlet baffle; 18. Liquid outlet baffle; 19. Flow baffle; 20. Barrier cavity; 21. Drain baffle; 22. Partition plate; 23. Connecting column. 24. Flow notch, 25. Liquid settling tank, 26. Inlet pipe, 27. Water pump, 28. Convex ring, 29. Drive motor, 30. Sealing cover, 31. Filter tank, 32. Outlet channel, 33. End cap, 34. Filter bottle, 35. Inlet, 36. Outlet, 37. Bottle cap, 38. Upper filter plate, 39. Lower filter plate, 40. Flow tube, 41. Inlet pipe, 42. External flow cavity, 43. Internal flow cavity, 44. Connecting slot, 45. Support, 46. Return cavity. Detailed Implementation

[0035] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings: Example 1: A multi-stage filtration device for a water tank (see...) Figure 1 , Figure 2 , Figure 3 , Figure 4 The system includes a reversing valve 1 and several filter units. The flow paths of the filter units are connected in series. The filter units are loaded with filter media. Different filter media are selected for different filter units to improve the filtration effect. The water flows through the filter media in the filter units in sequence to achieve filtration. The reversing valve 1 reverses and switches the flow direction of the water.

[0036] Several filtration units include a primary filtration unit 2 and a secondary filtration unit 3. Primary filtration unit 2 contains primary filter media 4, and secondary filtration unit 3 contains secondary filter media 5. Primary filter media 4 is either filter sand or glass filter media, and secondary filter media 5 is fiber balls. Filter sand has a relatively low filtration precision, typically around 5-20 micrometers; glass filter media is used in the same way as filter sand, with a filtration precision of 1-20 micrometers. Filter sand mainly traps impurities through the gaps between particles and the contact surface, and its pores are relatively large. Filter sand has advantages such as high mechanical strength, good chemical stability, and low price, and is widely used in water treatment scenarios where filtration precision requirements are not particularly high. Fiber balls have a relatively high filtration precision, effectively removing suspended solids, colloids, organic matter, and other impurities from water, with a filtration precision of 1-5 micrometers. Because fiber balls have a large specific surface area, high porosity, and strong adsorption capacity, the fiber filaments form a three-dimensional filter layer in the water, which has a good trapping and adsorption effect on impurities.

[0037] The primary filtration unit 2 includes a filter cartridge 6 and a core tube 7. The lower end of the core tube 7 extends to the bottom of the filter cartridge 6, and the primary filter media 4 is loaded inside the filter cartridge 6. The filter cartridge 6 is open at the top and has a base at the bottom, which is supported on the ground. Several horizontally arranged flow tubes 8 are installed at the lower part of the core tube 7. The outer ends of the flow tubes 8 are closed, and the flow tubes 8 are densely covered with several filter holes. A mounting base 9 is connected to the bottom of the core tube 7 and is supported at the bottom of the filter cartridge 6. The mounting base 9 has several circumferentially spaced insertion holes, and the flow tubes 8 are inserted into these holes. A positioning boss 10 is provided at the bottom of the filter cartridge 6, and the lower end of the mounting base 9 is fitted and connected to the positioning boss 10.

[0038] When the primary filtration unit 2 filters the water flow, the water is transported from the upper end of the filter cylinder 6 into the filter cylinder 6, filtered by the primary filter media 4, and then transported from the lower end of the core tube 7 into the core tube 7, and exited from the upper end of the core tube 7 into the secondary filtration unit 3. The horizontally arranged flow pipe 8 increases the range and area through which the water flows, which is beneficial for the water flow to be transported from the primary filter media 4 into the core tube 7.

[0039] The reversing valve 1 is provided with an inlet 11, an outlet 12 and a drain 13. The reversing valve 1 is provided with an installation cavity 14 and a flow sleeve 15. The reversing disk 16 is installed in the installation cavity 14 and a baffle 22 is provided at the bottom of the installation cavity 14 to form an inlet baffle 17, an outlet baffle 18, a flow baffle 19, a barrier cavity 20 and a drain baffle 21. The baffle 22 is connected between the flow sleeve 15 and the inner wall of the installation cavity 14. The upper end of the flow sleeve 15 is closed and the lower end of the flow sleeve 15 is open. A connecting post 23 is provided at the upper end of the flow sleeve 15. The reversing disk 16 is rotatably connected to the connecting post 23. A gap is provided between the outer wall of the reversing disk 16 and the side wall of the installation cavity 14 to facilitate the flow of water in the installation cavity 14. The reversing plate 16 is provided with a flow passage notch 24 and a liquid passage trough 25. The liquid passage notch has a V-shaped structure, and the liquid passage trough 25 has a semi-circular structure. The liquid inlet 11 is connected to the flow passage notch 24, the liquid outlet 12 is connected to the liquid outlet diaphragm 18, the liquid drain 13 is connected to the liquid drain diaphragm 21, the liquid inlet diaphragm 17 is connected to the inlet end of the primary filter unit 2, and the flow passage diaphragm 19 is connected to the flow passage sleeve 15. The reversing valve 1 is connected to the water inlet pipe 26, which is connected to the water outlet end of the water pump 27 and the liquid inlet 11 of the reversing valve 1.

[0040] A raised ring 28 is provided on the inner wall of the mounting cavity 14. The reversing plate 16 is sealed and covered on the raised ring 28. The liquid inlet 11 is located above the raised ring 28. The partition plate 22 is connected to the inner wall of the raised ring 28. A drive motor 29 is installed on the reversing valve 1. The output shaft of the drive motor 29 is connected to the drive gear. The driven gear is connected to the reversing plate 16. The drive gear and the driven gear mesh and drive each other. A sealing cover 30 is installed inside the reversing valve 1. The sealing cover 30 is placed above the reversing plate 16, thereby sealing the mounting cavity 14.

[0041] The direction of water flow is switched by rotating the reversing disc 16. The inlet 11 is always connected to the flow passage 24. The flow passage 24 can rotate to connect with the inlet baffle 17, the outlet baffle 18, the flow passage baffle 19, the barrier chamber 20, and the drain baffle 21. During normal filtration, the flow passage 24 is connected to the inlet baffle 17, and the flow passage settling tank 25 is connected between the outlet baffle 18 and the flow passage baffle 19. During backwashing, the flow passage 24 is connected to the flow passage baffle 19, and the flow passage settling tank 25 is connected between the inlet baffle 17 and the drain baffle 21. During flow interception, the flow passage 24 is connected to the barrier chamber 20.

[0042] The reversing valve 1 is installed on the upper end of the primary filter unit 2. The secondary filter unit 3 includes a filter tank 31 and an outlet channel 32. The secondary filter media 5 is loaded in the filter tank 31. One end of the outlet channel 32 extends to the bottom of the filter tank 31, and the other end of the outlet channel 32 extends to the outside of the filter tank 31. The upper opening of the filter tank 31 is connected to the outlet end of the primary filter unit 2 through a pipe and the reversing valve 1.

[0043] Several horizontally arranged flow pipes 8 are installed at intervals around the lower end of the water outlet channel 32. The outer ends of the flow pipes 8 are closed, and several filter holes are densely distributed on the flow pipes 8. A mounting base 9 is connected to the bottom of the water outlet channel 32. The mounting base 9 is supported on the bottom of the filter cylinder 6. Several insertion holes are arranged at intervals around the mounting base 9, and the flow pipes 8 are inserted into the insertion holes. A positioning boss 10 is provided at the bottom of the filter tank 31, and the lower end of the mounting base 9 is adapted to connect with the positioning boss 10. An end cap 33 is connected to the upper end of the filter tank 31, and a filter plug is connected to the bottom of the end cap 33. An inlet and an outlet pipe are provided on the end cap 33. The upper end of the water outlet channel 32 is connected to the outlet pipe, and a pipe is connected between the inlet and the liquid outlet 12 of the reversing valve 1.

[0044] The filter cartridge 6 of the primary filtration unit 2 has an open top and is connected to the lower end of the reversing valve 1. The lower end of the reversing valve 1 is connected to the filter plug. The upper end of the core tube 7 is connected to the flow sleeve 15. The open top of the filter cartridge 6 is connected to the inlet chamber 17. The reversing valve 1 can switch the flow direction of the water, thereby realizing different working modes such as filtration, backwashing, and interception of the water circuit, which is flexible and convenient.

[0045] During filtration, the flow passage 24 is connected to the inlet chamber 17, and the flow settling tank 25 is connected between the outlet chamber 18 and the flow passage chamber 19. Water is fed in from the inlet 11, passes through the flow passage 24 and the inlet chamber 17, and is transported to the filter cylinder 6 of the first-stage filtration unit 2. After being filtered by the first-stage filter media 4, it flows into the core tube 7, and then passes through the flow passage chamber 19, the outlet chamber 18, and the outlet 12 to the filter tank 31 of the second-stage filtration unit 3. After being filtered by the second-stage filter media 5, it flows into the outlet channel 32 and is finally discharged outward from the outlet pipe on the end cap 33.

[0046] During backwashing, the flow notch 24 is connected to the flow-through baffle 19, and the liquid-through settling tank 25 is connected between the liquid inlet baffle 17 and the liquid outlet baffle 21. Water is fed in from the liquid inlet 11, passes through the flow notch 24 and the flow-through baffle 19 and is transported to the core tube 7 of the primary filter unit 2. It then flows upward from the bottom of the primary filter media 4, passes through the open end of the primary filter unit 2 and is transported upward to the liquid inlet baffle 17. After passing through the liquid-through settling tank 25 and the liquid outlet baffle 21, it is discharged outward from the liquid outlet 13.

[0047] When the flow is cut off, the flow gap 24 is connected to the barrier cavity 20. At this time, the water flow is cut off in the barrier cavity 20 and cannot flow.

[0048] The water flows sequentially through the primary filtration unit 2 and the secondary filtration unit 3. The primary filter media 4 in primary filtration unit 2 and the secondary filter media 5 in secondary filtration unit 3 filter the water in sequence, greatly improving the filtration effect. Using different filter media allows for different filtration performances, thereby improving the filtration effect and extending the service life of the filter media. The reversing valve 1 can switch the direction of water flow, thus realizing different working modes such as filtration, backwashing, and interception, offering flexibility and convenience.

[0049] Example 2: A multi-stage filtration device for a water tank (see...) Figure 3 , Figure 4 , Figure 5 , Figure 6 Its structure is similar to that of Embodiment 1, with the main difference being that in this embodiment, the reversing valve 1 is installed on the upper end of the primary filtration unit 2, and the secondary filtration unit 3 includes a filter bottle 34, in which secondary filter media 5 is loaded. An inlet 35 is provided at the upper part of the filter bottle 34, and an outlet 36 is provided at the lower part. The inlet 35 is connected to the outlet of the primary filtration unit 2 via a pipe and the reversing valve 1. A bottle cap 37 is provided at the upper end of the filter bottle 34, and the inlet 35 is located on the bottle cap 37. A filter plate 38 is installed at the bottom of the bottle cap 37, and a lower filter plate 39 is provided at the bottom of the filter bottle 34. The secondary filter media 5 is loaded on the lower filter plate 39, and the outlet 36 is located below the lower filter plate 39. The inlet 35 on the bottle cap 37 is connected to the outlet 12 on the reversing valve 1 via a pipe. Other structures are the same as in Embodiment 1.

[0050] During filtration, the flow notch 24 is connected to the inlet chamber 17, and the flow settling tank 25 is connected between the outlet chamber 18 and the flow passage chamber 19. Water is fed in from the inlet 11, passes through the flow notch 24 and the inlet chamber 17, and is transported to the filter cylinder 6 of the primary filtration unit 2. After being filtered by the primary filter media 4, it flows into the core tube 7, and then passes through the flow passage chamber 19, the outlet chamber 18, and the outlet 12 to the filter bottle 34 of the secondary filtration unit 3. After being filtered by the secondary filter media 5, it is discharged from the outlet 36 on the filter bottle 34.

[0051] During backwashing, the flow notch 24 is connected to the flow-through baffle 19, and the liquid-through settling tank 25 is connected between the liquid inlet baffle 17 and the liquid outlet baffle 21. Water is fed in from the liquid inlet 11, passes through the flow notch 24 and the flow-through baffle 19 and is transported to the core tube 7 of the primary filter unit 2. It then flows upward from the bottom of the primary filter media 4, passes through the open end of the primary filter unit 2 and is transported upward to the liquid inlet baffle 17. After passing through the liquid-through settling tank 25 and the liquid outlet baffle 21, it is discharged outward from the liquid outlet 13.

[0052] When the flow is cut off, the flow gap 24 is connected to the barrier cavity 20. At this time, the water flow is cut off in the barrier cavity 20 and cannot flow.

[0053] The water flows sequentially through the primary filtration unit 2 and the secondary filtration unit 3. The primary filter media 4 in primary filtration unit 2 and the secondary filter media 5 in secondary filtration unit 3 filter the water in sequence, greatly improving the filtration effect. Using different filter media allows for different filtration performances, thereby improving the filtration effect and extending the service life of the filter media. The reversing valve 1 can switch the direction of water flow, thus realizing different working modes such as filtration, backwashing, and interception, offering flexibility and convenience.

[0054] Example 3: A multi-stage filtration device for a water tank (see...) Figure 4 , Figure 7 , Figure 8 , Figure 9 Its structure is similar to that of Embodiment 1, with the main difference being that in this embodiment, the secondary filter unit 3 is installed between the reversing valve 1 and the primary filter unit 2. The secondary filter unit 3 includes a connecting seat and several circumferentially spaced flow tubes 40. In this embodiment, four flow tubes 40 are evenly distributed circumferentially, forming a cross-shaped structure. An inlet pipe 41 is installed inside the flow tube 40, and the secondary filter material 5 is loaded in the flow tube 40. One end of the inlet pipe 41 extends to the bottom of the flow tube 40, and the other end of the inlet pipe 41 is connected to the flow sleeve 15 on the reversing valve 1. The flow tube 40 is connected to the outlet end of the primary filter unit 2.

[0055] The connecting seat is provided with an external flow cavity 42, an internal flow cavity 43, and several circumferentially arranged connecting slots 44. All connecting slots 44 communicate with the internal flow cavity 43. The open end of the flow tube 40 is tightly connected to the connecting slots 44. The upper end of the core tube 7 communicates with the internal flow cavity 43. The external flow cavity 42 communicates between the liquid inlet diaphragm 17 on the reversing valve 1 and the upper opening of the filter cartridge 6. A support 45 is provided inside the internal flow cavity 43, and a return cavity 46 is provided inside the support 45. The inlet pipe 41 is connected to the support 45, and the support 45 is connected to the flow sleeve 15, thereby connecting the return cavity 46 between the inlet pipe 41 and the flow sleeve 15. Other structures are the same as in Embodiment 1.

[0056] During filtration, the flow notch 24 is connected to the inlet chamber 17, and the flow settling tank 25 is connected between the outlet chamber 18 and the flow passage chamber 19. Water is fed in from the inlet 11, passes through the flow notch 24, the inlet chamber 17, and the outer flow passage chamber 42, and is transported to the filter cylinder 6 of the first-stage filtration unit 2. After being filtered by the first-stage filter media 4, it flows into the core tube 7, and then passes through the inner flow passage chamber 43 and the connecting slot 44 to the flow passage cylinder 40 of the second-stage filtration unit 3. After being filtered by the second-stage filter media 5, it is transported outward from the inlet pipe 41 to the return chamber 46 on the support 45, and is discharged outward through the flow sleeve 15, the flow passage chamber 19, the outlet chamber 18, and the outlet 12.

[0057] During backwashing, the flow notch 24 is connected to the flow-through baffle 19, and the liquid-through settling tank 25 is connected between the liquid inlet baffle 17 and the liquid outlet baffle 21. Water is fed in from the liquid inlet 11, passes through the flow notch 24, the flow-through baffle 19, the flow-through sleeve 15, and the return cavity 46 on the support 45, and is then transported to the inlet pipe 41. After rinsing the secondary filter media 5 in the flow-through cylinder 40, the water is transported from the outlet of the flow-through cylinder 40 to the inner flow-through cavity 43 and the core tube 7 of the primary filter unit 2, and flows upward from the bottom of the primary filter media 4. It is then transported upward through the opening end of the primary filter unit 2 to the outer flow-through cavity 42 and the liquid inlet baffle 17, and is discharged outward from the liquid outlet 13 after passing through the liquid-through settling tank 25 and the liquid outlet baffle 21.

[0058] When the flow is cut off, the flow gap 24 is connected to the barrier cavity 20. At this time, the water flow is cut off in the barrier cavity 20 and cannot flow.

[0059] The water flows sequentially through the primary filtration unit 2 and the secondary filtration unit 3. The primary filter media 4 in primary filtration unit 2 and the secondary filter media 5 in secondary filtration unit 3 filter the water in sequence, greatly improving the filtration effect. Using different filter media allows for different filtration performances, thereby improving the filtration effect and extending the service life of the filter media. The reversing valve 1 can switch the direction of water flow, thus realizing different working modes such as filtration, backwashing, and interception, offering flexibility and convenience.

[0060] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. A multi-stage filtration device for a water tank, characterized in that, It includes a reversing valve and several filter units. The flow paths of the filter units are connected in series. The filter units are loaded with filter media. The water flows through the filter media in the filter units in sequence to achieve filtration. The reversing valve reverses the flow direction of the water. The filter units include primary filter units and secondary filter units. The primary filter units are loaded with primary filter media, and the secondary filter units are loaded with secondary filter media.

2. The multi-stage filtration device for a water tank according to claim 1, characterized in that, The primary filter media is filter sand or glass filter media, and the secondary filter media is fiber balls.

3. The multi-stage filtration device for water tanks according to claim 1, characterized in that, The primary filtration unit includes a filter cartridge and a core tube. The lower end of the core tube extends to the bottom of the filter cartridge, and the primary filter media is loaded in the filter cartridge.

4. The multi-stage filtration device for a water tank according to claim 3, characterized in that, Several horizontally arranged flow tubes are installed at the bottom of the core tube, and the flow tubes are densely covered with filter holes.

5. The multi-stage filtration device for a water tank according to claim 4, characterized in that, The bottom of the core tube is connected to a mounting base, which is supported at the bottom of the filter cartridge. The mounting base has several insertion holes spaced around the circumference, and the flow tube is inserted into the insertion holes.

6. The multi-stage filtration device for a water tank according to claim 1, characterized in that a reversing valve... The valve is equipped with an inlet, an outlet, and a drain outlet. The reversing valve has an installation cavity and a flow sleeve. The reversing disc is installed in the installation cavity and rotated. A baffle is installed at the bottom of the installation cavity to form an inlet baffle, an outlet baffle, a flow baffle, a barrier cavity, and a drain baffle. The reversing disc has a flow notch and a flow trough. The inlet and the flow notch are connected. The outlet and the outlet baffle are connected. The drain outlet and the drain baffle are connected. The inlet baffle is connected to the inlet of the first-stage filter unit. The flow baffle is connected to the flow sleeve.

7. The multi-stage filtration device for a water tank according to any one of claims 1 to 6, characterized in that, The reversing valve is installed at the top of the primary filtration unit. The secondary filtration unit includes a filter tank and an outlet channel. The secondary filter media is loaded in the filter tank. One end of the outlet channel extends to the bottom of the filter tank, and the other end extends to the outside of the filter tank. The opening at the top of the filter tank is connected to the outlet of the primary filtration unit through a pipe and the reversing valve.

8. The multi-stage filtration device for a water tank according to any one of claims 1 to 6, characterized in that, The reversing valve is installed at the top of the primary filtration unit. The secondary filtration unit includes a filter bottle, in which the secondary filter media is loaded. The filter bottle has an inlet at the top and an outlet at the bottom. The inlet is connected to the outlet of the primary filtration unit via a pipe and the reversing valve.

9. The multi-stage filtration device for a water tank according to any one of claims 1 to 6, characterized in that, The secondary filter unit is installed between the reversing valve and the primary filter unit. The secondary filter unit includes several circumferentially spaced flow tubes. An inlet pipe is installed inside the flow tube. The secondary filter media is loaded in the flow tube. One end of the inlet pipe extends to the bottom of the flow tube, and the other end of the inlet pipe is connected to the reversing valve. The flow tube is connected to the outlet end of the primary filter unit.

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