A prefilter for a filter battery

Abstract

This utility model discloses a pre-filter with multiple filter bottles, relating to the field of water purification technology. It aims to solve the technical problem that current multi-filter bottle water purifiers on the market only improve filtration efficiency but do not enhance water flow efficiency during filtration. The key technical points are: it includes a machine head and filter bottles installed on the machine head; the number of filter bottles is at least two; the machine head includes an inlet pipe and an outlet pipe; the inlet pipe has several raw water interfaces connected in parallel, each connected to the raw water area of ​​a corresponding filter bottle; the outlet pipe has several clean water interfaces connected in parallel, each connected to the clean water area of ​​a corresponding filter bottle. The purpose of this utility model is to provide a pre-filter with multiple filter bottles.

Description

Technical Field

[0001] This utility model relates to the field of water purification, and more specifically, it relates to a pre-filter with multiple filter bottles. Background Technology

[0002] Municipal tap water is subject to secondary pollution such as pipe corrosion and sediment, which deteriorates the quality of household water. Pre-filters are usually installed on the pipes entering the house to improve the water quality.

[0003] The applicant has filed a patent application for a stacked disc composite vertical forward filter with backwashing function, as published in Chinese Patent Publication No. CN219149403U. The key technical features are: a head with an inlet and an outlet; a filter bottle adapted to the head; a drain device at the bottom of the filter bottle; a base adapted to the end of the filter bottle; a base cavity within the base; the base cavity communicating with the outlet; a stacked disc composite filtration unit within the filter bottle; the stacked disc composite filtration unit comprising a filtration and backwashing subunit and a stacked disc subunit; the filtration and backwashing subunit being inserted within the stacked disc subunit; the filtration and backwashing subunit comprising a filtration functional section and a backwashing functional section; a raw water chamber between the stacked disc subunit and the filter bottle; a primary purification water chamber between the stacked disc subunit and the filtration functional section; a secondary purification water chamber within the filtration functional section; and the raw water chamber and the primary purification water chamber communicating through the filter holes of the stacked disc subunit.

[0004] The above-mentioned technical solution is a typical bottom-mounted single-filter pre-filter water purifier. In order to improve the water flow efficiency during filtration, the existing product design generally increases the filtration surface of a single filter element, that is, increases the length of the filter bottle and the filter element. However, the multi-filter water purifiers on the market are generally series-connected, which aims to improve the filtration effect through multiple filtrations, but does not improve the water flow efficiency during filtration. Therefore, the existing technology lacks a water purifier that uses a multi-filter solution to improve the water flow efficiency during filtration, and a new solution is needed to solve this problem.

[0005] Therefore, a new technical solution is urgently needed to solve the above-mentioned technical problems. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a pre-filter with multiple filter bottles.

[0007] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a pre-filter with multiple filter bottles, including a head and filter bottles installed on the head, wherein the number of filter bottles is at least two; The machine head includes an inlet pipe and an outlet pipe; the inlet pipe is provided with several raw water interfaces in parallel, and each is connected to the raw water area of ​​the corresponding filter bottle; the outlet pipe is provided with several clean water interfaces in parallel, and each is connected to the clean water area of ​​the corresponding filter bottle.

[0008] By adopting the above technical solution, the pre-filter can increase the water inflow and improve the filtration efficiency by installing multiple filter bottles. In specific use, raw water enters from the inlet pipe of the machine head and, after being diverted, enters the raw water area of ​​the corresponding filter bottle through the raw water interface. Thus, multiple filter bottles simultaneously filter the allocated raw water. The filtered clean water enters the clean water area and is then converged through the clean water interface, finally being discharged through the outlet pipe to supply clean water. In summary, this application adopts a parallel multi-filter bottle structure to achieve simultaneous filtration of raw water distribution, effectively improving the water flow efficiency during filtration.

[0009] The present invention is further configured such that: the specific number of the filter bottles is two, and they are arranged in an upper and lower layout, namely an upper filter bottle and a lower filter bottle; The machine head is enclosed in a machine head shell, and the upper and lower filter bottles are threadedly connected to the machine head shell. The inlet pipe has a vertical outer pipe, and the two raw water inlets are located at both ends of the vertical outer pipe; the outlet pipe has a vertical core pipe, which is coaxially suspended and fixed to the vertical outer pipe, and the two purified water inlets are located at both ends of the vertical core pipe.

[0010] The present invention is further configured such that: an upper stacked plate frame is fixedly fixed inside the upper filter bottle, a plurality of filter plates are sleeved on the upper stacked plate frame, an upper core frame is telescopically connected inside the upper stacked plate frame, and an upper core frame is provided with an upper cap; an elastic element is provided between the upper stacked plate frame and the upper core frame, and the elastic element releases elastic potential energy to force the upper cap to press the plurality of filter plates together. The lower filter bottle has a lower filter plate frame fixed inside, and multiple filter plates are sleeved on the lower filter plate frame. A lower core frame is telescopically connected inside the lower filter plate frame, and the lower core frame is provided with a lower end cap. An elastic element is provided between the lower filter plate frame and the lower core frame, and the elastic element forces the lower end cap to press the multiple filter plates together.

[0011] The present invention is further configured such that: a backwashing switching mechanism is provided between the machine head and the upper filter bottle and the lower filter bottle respectively; The backwashing switching mechanism includes an inner guide sleeve, an outer guide sleeve, and a valve core tube. The inner guide sleeve is fixed to the machine head, the outer guide sleeve is fixed to the opening ends of the corresponding upper and lower filter bottles, and the valve core tube is fixed to the corresponding upper and lower core frames. The valve core tube is provided with a bidirectional sealing element. In the filtration state, the bidirectional seal is sealed in the inner guide sleeve. Raw water enters the raw water area outside the multiple filter discs through the raw water interface and the outer guide sleeve. After passing through the filtration gaps of the multiple filter discs, the raw water enters the clean water area inside the multiple filter discs. The clean water enters the clean water interface through the inside of the valve core tube. In the backflushing state, the bidirectional seal is sealed to the outer guide sleeve. Raw water enters the clean water zone within multiple filter stacks through the raw water interface, the inner guide sleeve, and the valve core tube, and backflushes through the gaps between the multiple filter stacks to enter the raw water zone outside the multiple filter stacks.

[0012] The present invention is further configured such that: the vertical core tube is provided with an assembly core sleeve, and the inner guide sleeve is sleeved and snapped to the assembly core sleeve.

[0013] The present invention is further configured as follows: the upper cap is provided with an upper sewage seal, which separates the upper sewage seal from the closed end of the upper filter bottle to form an upper sewage discharge chamber; the upper cap is provided with a connecting groove for connecting the upper sewage discharge chamber and the raw water area of ​​the upper filter bottle; the upper core frame is provided with an upper sewage discharge core tube, the top end of which passes through the upper cap and connects to the upper sewage discharge chamber; the lower cap is provided with a sludge collection cover, which cooperates with the lower cap to form a sludge collection chamber; the lower core frame is provided with a lower sewage discharge core tube, the top end of which connects to the upper sewage discharge core tube, and the bottom end of which connects to the sludge collection chamber; the lower cap is provided with a vortex groove for connecting the sludge collection chamber and the raw water area of ​​the lower filter bottle.

[0014] The present invention is further configured such that: the lower cap and the sludge collection cover are fixed together with a lower sewage seal, the lower sewage seal is separated from the closed end of the lower filter bottle to form a pressure difference forming cavity, the bottom end of the lower filter bottle is provided with an opening and closing valve, and the sludge collection cover is provided with a sewage outlet that communicates with the pressure difference forming cavity.

[0015] The present invention is further configured such that: movable water seals are respectively provided between the assembly core sleeve and the upper and lower sewage core pipes.

[0016] The present invention is further configured such that: the upper core frame and the lower core frame are respectively provided with water-blocking base plates, and the upper stacked plate frame and the lower stacked plate frame are respectively provided with water-blocking pipe walls; in the backflushing state, the valve core tube is connected to the water-blocking pipe wall, and the water-blocking base plate is closed at the far end of the water-blocking pipe wall, thus forming a water collection cavity; the upper stacked plate frame and the lower stacked plate frame are respectively provided with jet arms whose inner cavities are connected to the water collection cavity, and the jet arms are provided with jet holes at equal intervals along the length direction.

[0017] The present invention is further configured such that: the lower core frame is provided with an inner extension tube, and the lower stacked plate frame is provided with an outer extension tube; in the backflush state, the valve core tube, the outer extension tube, the inner extension tube, the water-blocking pipe wall, and the water-blocking base plate cooperate to form a water collection cavity with a greater depth.

[0018] The present invention has the following beneficial effects: 1. By connecting multiple filter bottles in parallel to share the water flow, the cross-sectional area of ​​water flow per unit time and the total amount of water processed are significantly increased, thereby greatly improving the overall filtration efficiency and meeting the needs of high-flow water use scenarios.

[0019] 2. The water collection chamber formed during backwashing, together with the evenly distributed jet holes on the jet arm, can transform the backwash water into multiple uniform and powerful jets, which thoroughly flush the filter discs from the inside out, effectively removing dirt and avoiding cleaning dead corners.

[0020] 3. The coaxial arrangement of the vertical outer tube and the vertical core tube integrates the inlet and outlet water pipes, resulting in a compact and rationally laid-out head structure. Simultaneously, the layout of the upper and lower filter bottles makes full use of longitudinal space, minimizing the footprint of the multi-filter system.

[0021] 4. A pressure differential forming chamber is set at the bottom of the lower filter bottle, which can enhance the suction force of sewage discharge by utilizing fluid principles. Combined with the control of the on / off valve, the sewage is discharged more quickly and thoroughly, preventing blockage. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of this embodiment; Figure 2 This is a cross-sectional view of this embodiment; Figure 3 This is a cross-sectional view of the machine head and the upper filter bottle in this embodiment; Figure 4 This is a cross-sectional view of the head unit and the lower filter bottle in this embodiment; Figure 5 This is a cross-sectional view of the upper stack holder and the upper core holder in the recoil state of this embodiment; Figure 6 This is a cross-sectional view of the lower stacker and lower core holder in the recoil state of this embodiment; Figure 7 This is a flow diagram showing the filtering state in this embodiment; Figure 8 This is a flow diagram of the backflush state in this embodiment.

[0023] Attached diagram descriptions: 1. Filter head; 11. Inlet pipe; 12. Outlet pipe; 13. Raw water interface; 14. Clean water interface; 15. Filter head housing; 16. Vertical outer pipe; 17. Vertical core tube; 18. Assembly core sleeve; 2. Upper filter bottle; 21. Upper disc frame; 22. Filter discs; 23. Upper core frame; 24. Upper cap; 25. Elastic element; 26. Upper wastewater seal; 27. Upper drain chamber; 28. Connecting groove; 29. ​​Upper drain core tube; 3. Lower filter bottle; 31. Lower disc frame; 32. Lower... 33. Core frame; 34. Lower end cap; 35. Sewage collection cover; 36. Sewage collection chamber; 37. Lower sewage discharge core pipe; 38. Swirl channel; 39. Lower sewage seal; 40. Differential pressure forming chamber; 41. On / off valve; 42. Sewage outlet; 53. Movable water seal; 54. Inner guide sleeve; 55. Outer guide sleeve; 56. Valve core tube; 57. Bidirectional seal; 58. Water-blocking base plate; 59. Water-blocking pipe wall; 50. Water collection chamber; 61. Jet arm; 62. Jet orifice; 63. Inner extension pipe; 64. Outer extension pipe. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings.

[0025] Identical parts are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "bottom surface," "top surface," "inner," and "outer" refer to directions toward or away from the geometric center of a specific part, respectively.

[0026] A pre-filter with multiple filter bottles, such as Figure 1 , Figure 2 As shown, it includes a machine head 1 and filter bottles installed on the machine head, with at least two filter bottles; the machine head 1 includes an inlet pipe 11 and an outlet pipe 12; the inlet pipe 11 is provided with several raw water interfaces 13 in parallel, and each is connected to the raw water area of ​​the corresponding filter bottle; the outlet pipe 12 is provided with several clean water interfaces 14 in parallel, and each is connected to the clean water area of ​​the corresponding filter bottle.

[0027] This pre-filter can increase the water intake and improve filtration efficiency by installing multiple filter bottles. In actual use, raw water enters from the inlet pipe 11 of the head 1, and after being diverted, it enters the raw water area of ​​the corresponding filter bottle through the raw water interface 13. Thus, multiple filter bottles simultaneously filter the allocated raw water. The filtered clean water enters the clean water area and is collected through the clean water interface 1. Finally, it is discharged from the outlet pipe 12 to supply clean water. In summary, this application adopts a parallel multi-filter bottle structure to achieve synchronous filtration of raw water distribution, effectively improving the water flow efficiency during filtration.

[0028] In this embodiment, there are two filter bottles, arranged in an upper and lower layout, namely the upper filter bottle 2 and the lower filter bottle 3. In other embodiments, three or four filter bottles can also be used. The third filter bottle can be set at the rear of the machine head 1, and the fourth filter bottle can be set at the front of the machine head 1. The specific selection can be made according to the actual water consumption.

[0029] The more specific structure of the nose section 1 is as follows: Figure 1 , Figure 2 As shown, the head 1 is enclosed by a head housing 15, and the upper filter bottle 2 and the lower filter bottle 3 are threadedly connected to the head housing 15. On the one hand, the head housing 15 provides protection for the head 1, and on the other hand, it enables the upper filter bottle 2 and the lower filter bottle 3 to be detached and installed, providing convenience for users' maintenance.

[0030] The more specific structure of the water inlet pipe 11 is as follows: Figure 2 As shown, the inlet pipe 11 has a vertical outer pipe 16, with two raw water inlets 13 located at both ends of the vertical outer pipe 16, thus forming a traditional three-way pipe structure to achieve bidirectional diversion of raw water; the outlet pipe 11 has a more specific structure as shown in the figure. Figure 2 As shown, the water outlet pipe 12 has a vertical core tube 17, which is coaxially fixed to the vertical outer pipe 16. Two water purification interfaces 14 are located at both ends of the vertical core tube 17, thus forming a core-type tee pipe with both the vertical axis and the horizontal axis collinear with the water inlet pipe 11, ensuring bidirectional water purification flow while isolating it from the water inlet pipe 11.

[0031] The filtration structure of the top-mounted filter bottle 2 is as follows: Figure 3 As shown, an upper filter plate holder 21 is fixedly installed inside the upper filter bottle 2. Multiple filter plates 22 are sleeved on the upper filter plate holder 21. An upper core frame 23 is telescopically connected inside the upper filter plate holder 21. The upper core frame 23 is provided with an upper cap 24. An elastic element 25 is provided between the upper filter plate holder 21 and the upper core frame 23. The elastic element 25 releases elastic potential energy to force the upper cap 24 to press the multiple filter plates 22 tightly. This allows the multiple filter plates 22 to be loosely clamped and installed, ensuring the filtration effect with minimal gaps when the multiple filter plates 22 are in the filtration state. During cleaning, the clamping of the multiple filter plates 22 can be loosened, providing convenience for cleaning.

[0032] The filtration structure of the lower filter bottle 3 is as follows: Figure 4 As shown, a lower filter plate frame 31 is fixedly installed inside the lower filter bottle 3. Multiple filter plates 22 are sleeved on the lower filter plate frame 31. A lower core frame 32 is telescopically connected inside the lower filter plate frame 31. The lower core frame 32 is provided with a lower end cap 33. An elastic element 25 is provided between the lower filter plate frame 31 and the lower core frame 32. The elastic element 25 forces the lower end cap 33 to press the multiple filter plates 22 tightly. The design concept and design effect of the lower filter bottle 3 are the same as those of the upper filter bottle 2 mentioned above.

[0033] It should be noted that this embodiment is also equipped with a backwashing function to achieve efficient switching between filtration and backwashing modes, such as... Figure 2 As shown, a backwashing switching mechanism is provided between the machine head 1 and the upper filter bottle 2 and the lower filter bottle 3 respectively; the backwashing switching mechanism includes an inner guide sleeve 51, an outer guide sleeve 52, and a valve core tube 53. The inner guide sleeve 51 is fixed to the machine head 1, the outer guide sleeve 52 is fixed to the opening end of the corresponding upper filter bottle 2 and lower filter bottle 3, and the valve core tube 53 is fixed to the corresponding upper core frame 23 and lower core frame 32. The valve core tube 53 is provided with a bidirectional sealing element 54.

[0034] The working principle of the backwash switching mechanism is as follows: Figure 7 As shown, in the filtration state, the bidirectional seal 54 seals the inner guide sleeve 51. Raw water enters the raw water zone outside the multiple filter discs 22 through the raw water interface 13 and the outer guide sleeve 52. After passing through the filtration gaps of the multiple filter discs 22, the raw water enters the purified water zone inside the multiple filter discs 22. The purified water enters the purified water interface 14 through the inside of the valve core tube 53. In the backwash state, as shown... Figure 8 As shown, the bidirectional seal 54 seals the outer guide sleeve 52. Raw water enters the clean water zone within the multiple filter stacks 22 through the raw water interface 13, the inner guide sleeve 51, and the valve core tube 53, and then backwashes through the gaps between the multiple filter stacks 22 to enter the raw water zone outside the multiple filter stacks 22. In summary, the backwashing switching mechanism is directly linked to the axial displacement of the upper core frame 23 and the lower core frame 32 to achieve a high-level switching between the two working states. Furthermore, in the backwashing state, the multiple filter stacks 22 are in a relaxed state, achieving a better backwashing effect.

[0035] It should be noted that, as Figure 3 , Figure 4 As shown, the vertical core tube 17 is suspended and equipped with an assembly core sleeve 18. The inner guide sleeve 51 is sleeved and snapped to the assembly core sleeve 18, thereby realizing the installation of the inner guide sleeve 51 and avoiding the inner guide sleeve 51 from interfering with the flow channel of the purified water.

[0036] In this embodiment, a single-port drain design is used during backwashing. In other embodiments, a design for individual draining of a single filter bottle can also be used.

[0037] The specific structure of a single-outlet sewage discharge is as follows: Figure 2 , Figure 3 As shown, the upper cap 24 is provided with an upper sewage seal 26, which separates the upper filter bottle 2 from the closed end to form an upper sewage discharge chamber 27. The upper cap 24 is provided with a connecting groove 28 for connecting the upper sewage discharge chamber 27 and the raw water area of ​​the upper filter bottle 2. The upper core frame 23 is provided with an upper sewage discharge core tube 29, the top end of which passes through the upper cap 24 and connects to the upper sewage discharge chamber 27. Figure 2 , Figure 4As shown, the lower cap 33 is provided with a sludge collection cover 34, and the sludge collection cover 34 and the lower cap 33 cooperate to form a sludge collection chamber 35. The lower core frame 32 is provided with a lower sludge discharge core tube 36. The top end of the lower sludge discharge core tube 36 is connected to the upper sludge discharge core tube 29, and the bottom end of the lower sludge discharge core tube 36 is connected to the sludge collection chamber 35. The lower cap 33 is provided with a vortex groove 37 for connecting the sludge collection chamber 35 and the raw water area of ​​the lower filter bottle 3.

[0038] In the backwashing operation, the raw water in the upper filter bottle 2 is backwashed into the raw water area through the clean water area, carrying away the dirt retained on the filter media and turning it into sewage. The sewage passes through the connecting groove 28 and enters the upper sewage discharge chamber 27. Under the action of water pressure, it flows along the lower sewage discharge core pipe 29 and the lower sewage discharge core pipe 36, thus passing through the upper filter bottle 2, the machine head 1 and the lower filter bottle 3 without leakage and entering the sewage collection chamber 35. The raw water in the lower filter bottle 2 is backwashed into the raw water area through the clean water area and turns into sewage. The sewage passes through the vortex groove 37 and directly enters the sewage collection chamber 35, realizing the convergence of the two sewage streams, and then the sewage is discharged from the collection cover 34.

[0039] To achieve one-click switching between backwashing mode and sewage discharge, such as Figure 4 As shown, the lower cap 33 and the sludge collection cover 34 are fixed together with a lower sewage seal 38. The lower sewage seal 38 is separated from the closed end of the lower filter bottle 3 to form a pressure difference forming chamber 39. The bottom end of the lower filter bottle 3 is provided with an opening and closing valve 40. The sludge collection cover 34 is provided with a sewage outlet 41 that communicates with the pressure difference forming chamber 39.

[0040] When switching to backwash mode is required, opening the on / off valve 40 drains the stagnant liquid in the differential pressure chamber 39, creating a low-pressure zone below the lower wastewater seal 38. Water pressure then applies force to the lower wastewater seal 38, pushing the lower core frame 32 downwards, thus automatically switching between filtration and backwash modes. Simultaneously, the stagnant liquid in the upper drain chamber 27 is also drained through the upper drain core pipe 29 and the lower drain core pipe 36, creating a low-pressure zone at the closed end of the upper filter bottle 2. Water pressure then applies force to the upper wastewater seal 26, pushing the upper core frame 23 upwards, achieving a synchronous automatic switch to backwash mode. In summary, users only need to open the on / off valve 40 to switch between the two filter bottles to backwash mode with a single button, and achieve wastewater discharge, effectively improving ease of use.

[0041] In actual testing, it was found that because the upper core frame 23 and the lower core frame 32 need to be displaced axially, in order to avoid sewage leakage, such as... Figure 2 , Figure 3 , Figure 4 As shown, movable water seals 42 are respectively provided between the assembly core sleeve 18 and the upper drain core pipe 29 and the lower drain core pipe 36, so that the upper drain core pipe 29 and the lower drain core pipe 36 can be movably connected.

[0042] like Figure 5 , Figure 6 As shown, the upper core frame 23 and the lower core frame 32 are respectively provided with water-blocking base plates 55, and the upper stacked plate frame 21 and the lower stacked plate frame 31 are respectively provided with water-blocking pipe walls 56; in the backflushing state, the valve core tube 53 is connected to the water-blocking pipe wall 56, and the water-blocking base plate 55 is closed at the far end of the water-blocking pipe wall 56, forming a water collection cavity 57; the upper stacked plate frame 21 and the lower stacked plate frame 31 are respectively provided with jet arms 58 whose inner cavities are connected to the water collection cavity 57, and the jet arms 58 are provided with jet holes 59 at equal intervals along the length direction.

[0043] The lower core frame 32 is provided with an inner extension tube 60, and the lower stacked plate frame 31 is provided with an outer extension tube 61; in the backflush state, the valve core tube 53, the outer extension tube 61, the inner extension tube 60, the water-blocking pipe wall 56, and the water-blocking base plate 55 work together to form a deeper water collection cavity 57.

[0044] The raw water for backwashing is collected in the water collection chamber 57. After being guided by the jet arm 58, the raw water is ejected from each jet hole 59, thereby impacting the filter discs 22 and forcing them to rotate. This avoids dead corners in the rinsing process and greatly improves the cleaning efficiency and thoroughness of the filter discs 22. The water collection chamber 57 is further enlarged by the inner extension pipe 60 and the outer extension pipe 61, allowing more raw water to pass through and further improving the cleaning efficiency of the filter discs 22.

[0045] The specific embodiments are merely explanations of this utility model and are not intended to limit it. After reading this specification, those skilled in the art can make modifications to these embodiments without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this utility model.

Claims

1. A pre-filter with multiple filter bottles, comprising a head unit (1) and filter bottles mounted on the head unit, characterized in that: The number of filter bottles is at least two; The machine head (1) includes an inlet pipe (11) and an outlet pipe (12); the inlet pipe (11) is provided with several raw water interfaces (13) in parallel, and is connected to the raw water area of ​​the corresponding filter bottle respectively; the outlet pipe (12) is provided with several clean water interfaces (14) in parallel, and is connected to the clean water area of ​​the corresponding filter bottle respectively.

2. A pre-filter with multiple filter bottles according to claim 1, characterized in that: The filter bottles are two in number, arranged in an upper and lower layout, namely the upper filter bottle (2) and the lower filter bottle (3). The machine head (1) is wrapped with a machine head shell (15), and the upper filter bottle (2) and the lower filter bottle (3) are threadedly connected to the machine head shell (15). The inlet pipe (11) has a vertical outer pipe (16), and the two raw water interfaces (13) are located at both ends of the vertical outer pipe (16); the outlet pipe (12) has a vertical core pipe (17), the vertical core pipe (17) is coaxially suspended and fixed to the vertical outer pipe (16), and the two purified water interfaces (14) are located at both ends of the vertical core pipe (17).

3. A pre-filter with multiple filter bottles according to claim 2, characterized in that: The upper filter bottle (2) has an upper stacked plate frame (21) fixed inside, and multiple filter stacks (22) are sleeved on the upper stacked plate frame (21). An upper core frame (23) is telescopically connected inside the upper stacked plate frame (21), and the upper core frame (23) is provided with an upper cap (24). An elastic element (25) is provided between the upper stacked plate frame (21) and the upper core frame (23). The elastic element (25) releases elastic potential energy to force the upper cap (24) to press the multiple filter stacks (22) together. The lower filter bottle (3) has a lower plate frame (31) fixed inside it. The lower plate frame (31) is fitted with multiple filter plates (22). The lower core frame (32) is telescopically connected inside the lower plate frame (31). The lower core frame (32) is provided with a lower end cap (33). An elastic element (25) is provided between the lower plate frame (31) and the lower core frame (32). The elastic element (25) forces the lower end cap (33) to press the multiple filter plates (22).

4. A pre-filter with multiple filter bottles according to claim 3, characterized in that: A backwashing switching mechanism is provided between the machine head (1) and the upper filter bottle (2) and the lower filter bottle (3); The backwashing switching mechanism includes an inner guide sleeve (51), an outer guide sleeve (52), and a valve core tube (53). The inner guide sleeve (51) is fixed to the machine head (1), the outer guide sleeve (52) is fixed to the opening ends of the corresponding upper filter bottle (2) and lower filter bottle (3), and the valve core tube (53) is fixed to the corresponding upper core frame (23) and lower core frame (32). The valve core tube (53) is provided with a bidirectional sealing element (54). In the filtration state, the bidirectional seal (54) is sealed in the inner guide sleeve (51). The raw water enters the raw water area outside the multiple filter plates (22) through the raw water interface (13) and the outer guide sleeve (52). After passing through the filtration gap of the multiple filter plates (22), the raw water enters the clean water area inside the multiple filter plates (22). The clean water enters the clean water interface (14) through the inside of the valve core tube (53). In the backflush state, the bidirectional seal (54) is sealed to the outer guide sleeve (52). The raw water enters the clean water zone within the multiple filter stacks (22) through the raw water interface (13), the inner guide sleeve (51) and the valve core tube (53), and backflushes through the gaps between the multiple filter stacks (22) to enter the raw water zone outside the multiple filter stacks (22).

5. A pre-filter with multiple filter bottles according to claim 4, characterized in that: The vertical core tube (17) is provided with an assembly core sleeve (18) in an overhead manner, and the inner guide sleeve (51) is sleeved and snapped to the assembly core sleeve (18).

6. A pre-filter with multiple filter bottles according to claim 5, characterized in that: The upper cap (24) is provided with an upper sewage seal (26), which is separated from the closed end of the upper filter bottle (2) to form an upper sewage discharge chamber (27). The upper cap (24) is provided with a connecting groove (28) for connecting the upper sewage discharge chamber (27) and the raw water area of ​​the upper filter bottle (2). The upper core frame (23) is provided with an upper sewage discharge core tube (29), the top end of which passes through the upper cap (24) and connects to the upper sewage discharge chamber (27). The lower cap (33) is provided with a sludge collection cover (34), and the sludge collection cover (34) and the lower cap (33) cooperate to form a sludge collection cavity (35). The lower core frame (32) is provided with a lower sludge discharge core tube (36), the top end of the lower sludge discharge core tube (36) is connected to the upper sludge discharge core tube (29), and the bottom end of the lower sludge discharge core tube (36) is connected to the sludge collection cavity (35). The lower cap (33) is provided with a vortex groove (37) for connecting the sludge collection cavity (35) and the raw water area of ​​the lower filter bottle (3).

7. A pre-filter with multiple filter bottles according to claim 6, characterized in that: The lower cap (33) and the sludge collection cover (34) are fixed together with a lower sewage seal (38). The lower sewage seal (38) is separated from the closed end of the lower filter bottle (3) to form a pressure difference forming chamber (39). The bottom end of the lower filter bottle (3) is provided with an opening and closing valve (40). The sludge collection cover (34) is provided with a sewage outlet (41) that communicates with the pressure difference forming chamber (39).

8. A pre-filter with multiple filter bottles according to claim 6, characterized in that: Movable water seals (42) are respectively provided between the assembly core sleeve (18) and the upper drain core pipe (29) and the lower drain core pipe (36).

9. A pre-filter with multiple filter bottles according to claim 4, characterized in that: The upper core frame (23) and the lower core frame (32) are respectively provided with water-blocking base plates (55), and the upper stacked plate frame (21) and the lower stacked plate frame (31) are respectively provided with water-blocking pipe walls (56); in the backflush state, the valve core tube (53) is connected to the water-blocking pipe wall (56), and the water-blocking base plate (55) is closed at the far end of the water-blocking pipe wall (56), forming a water collection cavity (57); the upper stacked plate frame (21) and the lower stacked plate frame (31) are respectively provided with jet arms (58) whose inner cavities are connected to the water collection cavity (57), and the jet arms (58) are provided with jet holes (59) at equal intervals along the length direction.

10. A pre-filter with multiple filter bottles according to claim 9, characterized in that: The lower core frame (32) is provided with an inner extension tube (60), and the lower stack frame (31) is provided with an outer extension tube (61). In the backflush state, the valve core tube (53), the outer extension tube (61), the inner extension tube (60), the water-blocking pipe wall (56), and the water-blocking base plate (55) cooperate to form a deeper water collection cavity (57).

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