A dual-filter backwashing structure for single-discharge sewage

Abstract

This utility model discloses a dual-filter backwashing structure for single-discharge sewage, relating to the field of filter technology, and aims to solve the technical problem that the backwashing unit can only adapt to the backwashing of a single filter element. The key technical points are: it includes a head, filter element assemblies, and switching mechanisms. The filter element assembly includes a first filter element assembly and a second filter element assembly; the head is provided with an inlet pipe and two raw water interfaces connected to the inlet pipe; the number of switching mechanisms is two, and the two switching mechanisms respectively control the raw water area or purified water area of ​​the first filter element assembly and the second filter element assembly to connect to the corresponding raw water interface. The purpose of this utility model is to provide a dual-filter backwashing structure for single-discharge sewage.

Description

Technical Field

[0001] This utility model relates to filters, and more specifically, to a dual-filter backwashing structure for single-discharge sewage. Background Technology

[0002] Municipal tap water is susceptible to secondary pollution from pipe corrosion and sediment, leading to deterioration of household water quality. Pre-filters are typically installed on the inlet pipes to improve water quality. Over time, contaminants accumulate on the filter media, affecting filtration efficiency. Currently, common methods for cleaning filter media include forward rinsing, backwashing, siphon cleaning, and brushing. Market feedback indicates that backwashing is a convenient and efficient method for cleaning filter media.

[0003] Regarding the backwash filter, the applicant has filed a Chinese patent application with publication number CN219149403U, which discloses a stacked disc composite vertical forward filter with backwashing function. 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 filter unit within the filter bottle; the stacked disc composite filter 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] To improve the water purification efficiency of the filter, the applicant has developed a water purifier with two filter bottles connected in parallel. However, the backwashing unit of the above-mentioned technical solution can only accommodate the backwashing of a single filter element. Therefore, 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] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a dual-filter backwashing structure for single-discharge sewage.

[0007] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a dual-filter backwashing structure for single-discharge sewage, comprising a head, a filter element assembly, and a switching mechanism, characterized in that:

[0008] The filter element assembly includes a first filter element assembly and a second filter element assembly. Both the first and second filter element assemblies include a filter element structure frame and filter media arranged around the filter element structure frame. The outside of the filter media is the raw water area, and the inside of the filter media is the purified water area. The filter element structure frame of both the first and second filter element assemblies includes a central drain pipe, and one end of the two central drain pipes is connected.

[0009] The machine head is equipped with a water inlet pipe and two raw water interfaces connected to the water inlet pipe; there are two switching mechanisms, and the two switching mechanisms respectively control the raw water area or purified water area of ​​the first filter element assembly and the second filter element assembly to be connected to the corresponding raw water interface.

[0010] By adopting the above technical solution: the first filter element assembly and the second filter element assembly adopt a parallel filtration layout, which effectively improves the water flow rate during filtration; and the sewage is collected through two central drain pipes, so that the backwashing sewage discharge requirement of a single outlet can be achieved during backwashing.

[0011] The present invention is further configured such that: the machine head is provided with a water purification core tube, the water purification core tube is connected to a water outlet pipe, the water purification core tube is provided with two water purification interfaces, and the two water purification interfaces are respectively connected to the water purification areas of the first filter element assembly and the second filter element assembly.

[0012] The present invention is further configured such that: a central sleeve is coaxially suspended from the water purification core tube, and two central sewage pipes are inserted into the central sleeve.

[0013] The present invention is further configured such that: the filter element structure frame also includes a fixed frame, the fixed frame is provided with an end head, the central drain pipe is provided with an end cap, and the end head and the end cap cooperate to form a clamp for setting filter media;

[0014] The fixed frame is fixed relative to the filter bottle of the water purifier, the central drain pipe is movably connected to the axis of the fixed frame, and an elastic element is provided between the fixed frame and the central drain pipe.

[0015] The present invention is further configured such that: a distal end is provided at the end of the fixed frame away from the head end, a pressure plate is snapped and fixed at the distal end, an inner sealing element and an outer sealing element are provided between the pressure plate and the distal end, the inner sealing element is movably sealed with the central sewage pipe, and the outer sealing element is movably sealed with the end cap.

[0016] The present invention is further configured such that: the top end cap of the central drain pipe of the first filter element assembly is the drain inlet, and the bottom end cap of the central drain pipe of the second filter element assembly is the drain outlet;

[0017] The end cap of the second filter element assembly is provided with a dirt collection cover, which is connected to the sewage outlet. The dirt collection cover is provided with a vortex groove that is connected to the raw water area of ​​the second filter element assembly.

[0018] The present invention is further configured such that: the end cap of the first filter element assembly and the dirt collection cap of the second filter element assembly are both provided with piston rubber parts, the piston rubber parts are movably sealed with the filter bottle of the water purifier, the end cap of the first filter element assembly is provided with a sewage passage groove, and the bottom end of the dirt collection cap is provided with a negative pressure sewage outlet, the negative pressure sewage outlet is located in the negative pressure space formed by the piston rubber parts and the filter bottle of the water purifier.

[0019] The present invention is further configured such that: the filter material includes multiple annular pieces sleeved on a fixed frame, and each annular piece has a protruding strip on its end face to limit the minimum spacing between adjacent pieces.

[0020] The present invention is further configured such that: the switching mechanism includes a valve core tube fixed to the central sewage pipe, an inner guide sleeve fixed to the central sleeve, and an outer guide sleeve fixed to the fixed frame; the valve core tube is provided with a bidirectional sealing element.

[0021] When the bidirectional seal is pressed against the inner guide sleeve, it is in a filtering state, and the raw water enters the raw water area through the raw water interface, the outer wall of the valve core tube and the outer guide sleeve.

[0022] When the bidirectional seal is pressed against the outer guide sleeve, it is in a backflushing state, and the raw water enters the valve core tube through the raw water interface and passes through the backflushing into the clean water zone.

[0023] The present invention is further configured such that: the central drain pipe is provided with a water-blocking base plate, and the fixed frame is provided with a water-blocking pipe wall; in the backwashing state, the valve core pipe 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, forming a water collection cavity; the fixed frame is provided with a jet arm whose inner cavity is connected to the water collection cavity, and the jet arm is provided with jet holes at equal intervals along its length.

[0024] The present invention has the following beneficial effects: 1. Through a unique path switching, high-pressure backwashing from the inside to the outside is achieved, which can effectively remove deep impurities from the filter material.

[0025] 2. The flushing wastewater is collected in two interconnected central drain pipes and finally discharged through the drain outlet, which simplifies the external pipeline connection and makes installation more convenient.

[0026] 3. The design of uniform water distribution by the jet arm and adjustable gap between the filter plates ensures that there are no dead corners in the backwashing, resulting in a more uniform and thorough cleaning effect.

[0027] 4. The switching between filtration and backwashing states is controlled by water pressure and elastic components, and the water circuit is separated in each mode through multi-stage dynamic sealing, ensuring stable operation and no leakage. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural diagram of this embodiment;

[0029] Figure 2 This is a cross-sectional view of this embodiment;

[0030] Figure 3 This is a cross-sectional view of the head and the first filter element assembly in the filtration state of this embodiment;

[0031] Figure 4 This is a cross-sectional view of the head and the second filter element assembly in the filtration state of this embodiment;

[0032] Figure 5 This is a cross-sectional view of the machine head and the first filter element assembly under backwashing conditions in this embodiment;

[0033] Figure 6 This is a cross-sectional view of the machine head and the second filter element assembly in the backwashing state of this embodiment;

[0034] Figure 7 This is a three-dimensional structural diagram of the filter material in this embodiment;

[0035] Figure 8 This is a flow diagram showing the filtering state in this embodiment;

[0036] Figure 9 This is a flow path diagram of the backwashing state in this embodiment.

[0037] Figure Descriptions: 11. Inlet pipe; 12. Raw water interface; 13. Purified water core pipe; 14. Outlet pipe; 15. Purified water interface; 16. Center sleeve; 21. Filter element structure frame; 22. Filter media; 221. Annular plate; 222. Raised strip; 23. Center drain pipe; 45. Water-blocking base plate; 46. Water-blocking pipe wall; 47. Water collection chamber; 48. Jet arm; 49. Jet orifice; 24. Fixing frame; 2 5. End head; 26. End cap; 27. Elastic element; 28. Distal end; 29. ​​Pressure plate; 30. Inner seal; 31. Outer seal; 32. Sewage inlet; 33. Sewage outlet; 34. Sewage collection cover; 35. Swirl channel; 36. Piston rubber part; 37. Sewage channel; 38. Negative pressure sewage outlet; 41. Valve core tube; 42. Inner guide sleeve; 43. Outer guide sleeve; 44. Bidirectional seal. Detailed Implementation

[0038] The present invention will be further described in detail below with reference to the accompanying drawings.

[0039] 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.

[0040] A dual-filter backwashing structure for single-discharge sewage, such as... Figure 1 , Figure 2 , Figure 8 , Figure 9 As shown, it includes the machine head, filter assembly, and switching mechanism.

[0041] The filter element assembly includes a first filter element assembly and a second filter element assembly. Both the first and second filter element assemblies include a filter element structure frame 21 and filter media 22 arranged around the filter element structure frame 21. The outside of the filter media 22 is the raw water area, and the inside of the filter media 22 is the purified water area. The filter element structure frame 21 of both the first and second filter element assemblies includes a central drain pipe 23, and the two central drain pipes 23 are connected at one end.

[0042] The machine head is equipped with a water inlet pipe 11 and two raw water interfaces 12 connected to the water inlet pipe 11; there are two switching mechanisms, which respectively control the raw water area or purified water area of ​​the first filter element assembly and the second filter element assembly to be connected to the corresponding raw water interface 12.

[0043] In the filtration state, raw water enters through the inlet pipe 11. The entire structure is switched to the filtration state by the switching mechanism. The raw water enters the outside of the filter media 22 through the raw water interface 12, that is, it enters the raw water zone. It passes through the filter media 22 and enters the clean water zone to complete the filtration. The two streams of clean water after filtration are combined and supplied.

[0044] In the backwashing state, raw water also enters through the inlet pipe 11. The entire structure is switched to the backwashing state through the switching mechanism. The raw water inlet 12 enters the clean water zone. The raw water passes through the filter media 22 and enters the raw water zone, thereby achieving backwashing of the filter media 22. It should be noted that the water discharge paths of the first filter element assembly and the second filter element assembly after backwashing the filter media are slightly different. After the first filter element assembly finishes washing the filter media, the raw water enters the central drain pipe 23 at the top through water pressure. Since the two central drain pipes 23 are connected, the sewage can pass through the first filter element assembly, the machine head and the second filter element assembly without leakage through the two central drain pipes 23. After the second filter element assembly finishes washing the filter media 22, it can be collected together with the sewage discharged by the first filter element assembly through water pressure.

[0045] In summary, the first and second filter cartridges adopt a parallel filtration layout, which effectively increases the water flow rate during filtration; wastewater is collected through two central drain pipes 23, and the backwashing discharge requirement of a single outlet is met during backwashing.

[0046] like Figure 2 and Figure 3 As shown, the machine head is equipped with a water purification core tube 13, which is connected to a water outlet pipe 14. The water purification core tube 13 is equipped with two water purification interfaces 15, which are respectively connected to the water purification areas of the first filter element assembly and the second filter element assembly.

[0047] The raw water is filtered by the filter media 22 on the first filter element assembly and the second filter element assembly. After the filter media 22 on the first filter element assembly has filtered the raw water, it is isolated from the raw water through the water purification core tube 13, and the two streams of purified water are collected to achieve the collection and supply of purified water.

[0048] like Figure 2 As shown, a central sleeve 16 is coaxially suspended on the water purification core tube 13, and two central drain pipes 23 are inserted into the central sleeve 16; the adjacent ends of the two central drain pipes 23 are connected through the central sleeve 16, thereby achieving a movable seal between the two.

[0049] like Figure 3 , Figure 4 As shown, the filter element structure frame 21 also includes a fixed frame 24, the fixed frame 24 is provided with an end head 25, the central drain pipe 23 is provided with an end cap 26, and the end head 25 and the end cap 26 cooperate to form a clamp for setting the filter material 22.

[0050] The fixed frame 24 is fixed relative to the filter bottle of the water purifier. The central drain pipe 23 is movably connected to the axis of the fixed frame 24. An elastic element 27 is provided between the fixed frame 24 and the central drain pipe 23. In this embodiment, the elastic element 27 is a metal helical spring. In other embodiments, a rubber spring or a butterfly spring can also be used.

[0051] The elastic potential energy released by the elastic element 27 pushes the central drain pipe 23, forcing the clamp formed by the end head 25 and the end cap 26 to clamp and restrict the filter material 22, thereby achieving a loose and tight installation of the filter material 22.

[0052] like Figure 3 , Figure 4 As shown, the fixed frame 24 is provided with a distal end 28 at the end away from the end head 25. The distal end 28 is snapped and fixed with a pressure plate 29. An inner seal 30 and an outer seal 31 are provided between the pressure plate 29 and the distal end 28. The inner seal 30 is movably sealed with the central drain pipe 23, and the outer seal 31 is movably sealed with the end cap 26.

[0053] This achieves a dynamic seal between the fixed frame 24 and the central drain pipe 23 without affecting their relative mobility, effectively preventing liquid from entering between the distal end 28 and the end cap 26.

[0054] like Figure 3 , Figure 4 As shown, the top end cap 26 of the central drain pipe 23 of the first filter element assembly is the drain inlet 32, and the bottom end cap 26 of the central drain pipe 23 of the second filter element assembly is the drain outlet 33. The end cap 26 of the second filter element assembly is provided with a sludge collection cover 34, which is connected to the drain outlet 33. The sludge collection cover 34 is provided with a vortex channel 35, which is connected to the raw water area of ​​the second filter element assembly. In the backwashing state, the sewage of the first filter element assembly enters through the drain inlet 32, flows through the two central drain pipes 23, and is discharged into the sludge collection cover 34 through the drain outlet 33. The sewage of the second filter element assembly is flushed into the drain cover 34 through the vortex channel 35, so that the two streams of sewage are collected by the sludge collection cover 34.

[0055] like Figure 3 , Figure 4 , Figure 9 As shown, the end cap 26 of the first filter element assembly and the dirt collection cover 34 of the second filter element assembly are both provided with piston rubber parts 36. The piston rubber parts 36 are movably sealed with the filter bottle of the water purifier. The end cap 26 of the first filter element assembly is provided with a sewage passage 37. The bottom end of the dirt collection cover 34 is provided with a negative pressure sewage outlet 38. The negative pressure sewage outlet 38 is located in the negative pressure space formed by the piston rubber parts 36 and the filter bottle of the water purifier.

[0056] When backwashing is required, the liquid in the negative pressure space is discharged by controlling the solenoid valve or manual valve, thus making the space a negative pressure zone. Through the two central drain pipes 23, a negative pressure zone is also formed between the end cap 26 of the first filter element assembly and the closed end of the filter bottle. Under the action of water pressure, the central drain pipes 23 of the first and second filter elements can be pushed and moved synchronously. On the one hand, this realizes the switching from the filtration state to the backwashing state. On the other hand, it expands the clamping distance formed by the end head 25 and the end cap 26, thereby relaxing the filter material 22 and making it easier to be backwashed.

[0057] like Figures 7 to 9As shown, to enhance the backwashing effect by expanding the clamp opening, the filter media 22 in this embodiment includes multiple annular plates 221 fitted onto the fixed frame 24. Each annular plate 221 has a protrusion 222 on its end face to limit the minimum spacing between adjacent plates. This ensures that the annular plates 221 maintain a uniform gap during filtration, allowing raw water to smoothly pass through the filter media from the raw water zone into the clean water zone. During backwashing, the clamp opening formed by the end head 25 and the end cap 26 expands, allowing the gap between adjacent annular plates 221 to widen and change under the impact of water flow. This makes it easier to flush away the dirt clogging between adjacent annular plates 221, effectively improving the backwashing effect.

[0058] like Figure 3 , Figure 4 As shown, the switching mechanism includes a valve core tube 41 fixed to the central drain pipe 23, an inner guide sleeve 42 fixed to the central sleeve 16, and an outer guide sleeve 43 fixed to the fixed frame 24. The valve core tube 41 is provided with a bidirectional seal 44. When the bidirectional seal 44 is pressed against the inner guide sleeve 42, it is in the filtration state, and the raw water enters the raw water zone through the raw water interface 12, the outer wall of the valve core tube 41, and the outer guide sleeve 43. When the bidirectional seal 44 is pressed against the outer guide sleeve 43, it is in the backflushing state, and the raw water enters the valve core tube 41 through the raw water interface 12 and passes through the backflushing into the clean water zone.

[0059] like Figure 3 and Figure 4 As shown, when in filtration mode, under the action of elastic element 27, bidirectional seal 44 abuts against inner guide sleeve 42. At this time, raw water enters the raw water zone through the flow channel between the outer wall of valve core tube 41 and outer guide sleeve 43, and passes through filter media 22 to enter the clean water zone to complete filtration. The filtered clean water passes through the inside of valve core tube 41 and enters clean water core tube 13. When switching to backwash mode, the central drain pipe 23 undergoes axial displacement under water pressure, driving valve core tube 41 to move, causing bidirectional seal 44 to disengage from inner guide sleeve 42 and abut against outer guide sleeve 43. In this state, raw water interface 12 is connected to the inside of valve core tube 41, and raw water directly enters the clean water zone through the inside of valve core tube 41, thereby backwashing the filter media 22 into the raw water zone under water pressure. In summary, the switching mechanism achieves efficient switching between filtration mode and drain mode through axial displacement linkage with central drain pipe 23.

[0060] like Figure 5 , Figure 6As shown, the central drain pipe 23 is equipped with a water-blocking base plate 45, and the fixed frame 24 is equipped with a water-blocking pipe wall 46. In the backwashing state, the valve core pipe 41 is connected to the water-blocking pipe wall 46, and the water-blocking base plate 45 is closed at the far end of the water-blocking pipe wall 46, forming a water collection cavity 47. The fixed frame 24 is equipped with a jet arm 48 whose inner cavity is connected to the water collection cavity 47, and the jet arm 48 is provided with jet holes 49 at equal intervals along the length direction.

[0061] The raw water for backwashing is collected in the water collection chamber 47. After being guided by the jet arm 48, the raw water is ejected from each jet hole 49, thereby impacting the filter media 22 and forcing it to rotate. This avoids dead corners in the rinsing process and greatly improves the cleaning efficiency and thoroughness of the filter media 22.

[0062] 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 single-discharge, dual-filter backwashing structure for wastewater, comprising a head, a filter element assembly, and a switching mechanism, characterized in that: The filter element assembly includes a first filter element assembly and a second filter element assembly. Both the first and second filter element assemblies include a filter element structure frame (21) and filter media (22) arranged around the filter element structure frame (21). The outside of the filter media (22) is the raw water area, and the inside of the filter media (22) is the purified water area. The filter element structure frame (21) of both the first and second filter element assemblies includes a central drain pipe (23), and one end of the two central drain pipes (23) is connected. The machine head is provided with a water inlet pipe (11) and two raw water interfaces (12) connected to the water inlet pipe (11); the number of the switching mechanisms is two, and the two switching mechanisms respectively control the raw water area or purified water area of ​​the first filter element assembly and the second filter element assembly to be connected to the corresponding raw water interface (12).

2. The wastewater single-discharge dual-filter backwashing structure according to claim 1, characterized in that: The machine head is provided with a water purification core tube (13), which is connected to a water outlet pipe (14). The water purification core tube (13) is provided with two water purification interfaces (15), which are respectively connected to the water purification areas of the first filter element assembly and the second filter element assembly.

3. The wastewater single-discharge dual-filter backwashing structure according to claim 2, characterized in that: The water purification core tube (13) is coaxially suspended with a central sleeve (16), and the two central sewage pipes (23) are inserted into the central sleeve (16).

4. The wastewater single-discharge dual-filter backwashing structure according to claim 3, characterized in that: The filter element structure frame (21) also includes a fixed frame (24), the fixed frame (24) is provided with an end head (25), the central drain pipe (23) is provided with an end cap (26), and the end head (25) and the end cap (26) cooperate to form a clamp for setting the filter material (22); The fixed frame (24) is fixed relative to the filter bottle of the water purifier, the central drain pipe (23) is movably connected to the axis of the fixed frame (24), and an elastic element (27) is provided between the fixed frame (24) and the central drain pipe (23).

5. The wastewater single-discharge dual-filter backwashing structure according to claim 4, characterized in that: The fixed frame (24) has a distal end (28) at the end away from the head (25). The distal end (28) is fixed with a pressure plate (29). An inner seal (30) and an outer seal (31) are provided between the pressure plate (29) and the distal end (28). The inner seal (30) is movably sealed with the central drain pipe (23), and the outer seal (31) is movably sealed with the end cap (26).

6. The wastewater single-discharge dual-filter backwashing structure according to claim 5, characterized in that: The top end cap (26) of the central drain pipe (23) of the first filter element assembly is the drain inlet (32), and the bottom end cap (26) of the central drain pipe (23) of the second filter element assembly is the drain outlet (33). The end cap (26) of the second filter element assembly is provided with a dirt collection cover (34), which is connected to the sewage outlet (33). The dirt collection cover (34) is provided with a vortex groove (35) which is connected to the raw water area of ​​the second filter element assembly.

7. The wastewater single-discharge dual-filter backwashing structure according to claim 6, characterized in that: Both the end cap (26) of the first filter element assembly and the sludge collection cap (34) of the second filter element assembly are provided with piston rubber parts (36). The piston rubber parts (36) are movably sealed with the filter bottle of the water purifier. The end cap (26) of the first filter element assembly is provided with a sewage passage groove (37). The bottom end of the sludge collection cap (34) is provided with a negative pressure sewage outlet (38). The negative pressure sewage outlet (38) is located in the negative pressure space formed by the piston rubber parts (36) and the filter bottle of the water purifier.

8. The wastewater single-discharge dual-filter backwashing structure according to claim 4, characterized in that: The filter material (22) includes multiple annular pieces (221) fitted onto a fixed frame (24), and each annular piece (221) has a protrusion (222) on its end face to define the minimum spacing between adjacent pieces.

9. The wastewater single-discharge dual-filter backwashing structure according to claim 4, characterized in that: The switching mechanism includes a valve core tube (41) fixed to the central drain pipe (23), an inner guide sleeve (42) fixed to the central sleeve (16), and an outer guide sleeve (43) fixed to the fixed frame (24). The valve core tube (41) is provided with a bidirectional seal (44). When the bidirectional seal (44) is pressed against the inner guide sleeve (42), it is in a filtering state, and the raw water enters the raw water area through the raw water interface (12), the outer wall of the valve core tube (41) and the outer guide sleeve (43); When the bidirectional seal (44) is pressed against the outer guide sleeve (43), it is in a backflush state. The raw water enters the valve core tube (41) through the raw water interface (12) and passes through the backflush into the clean water area.

10. The wastewater single-discharge dual-filter backwashing structure according to claim 9, characterized in that: The central drain pipe (23) is provided with a water-blocking base plate (45), and the fixed frame (24) is provided with a water-blocking pipe wall (46). In the backwashing state, the valve core pipe (41) is connected to the water-blocking pipe wall (46), and the water-blocking base plate (45) is closed at the far end of the water-blocking pipe wall (46), forming a water collection cavity (47). The fixed frame (24) is provided with a jet arm (48) whose inner cavity is connected to the water collection cavity (47), and the jet arm (48) is provided with jet holes (49) at equal intervals along the length direction.

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