Backwash filter

Abstract

The invention relates to a backwashing filter. It solves the problem that the existing filter has a complex structure and is inconvenient to switch the flow direction of water flow in the backwashing and filtering states. It includes a filter cup body, an end cover with a water inlet and a water outlet is provided at the upper end of the filter cup body, a sewage discharge assembly is provided at the lower end of the filter cup body, a filter element assembly is provided inside the filter cup body, a scraping frame is sleeved on the circumferential outer side of the filter element assembly, a raw water cavity is provided between the circumferential outer side of the filter element assembly and the circumferential inner side of the filter cup body, a clean water cavity is provided on the circumferential inner side of the filter element assembly, a backwashing cavity is provided in the end cover, the clean water cavity is connected to the backwashing cavity through a one-way flow guide structure provided at the upper end of the filter element assembly, a backwashing water flow switching assembly is provided on the end cover, and a scraping drive mechanism is provided between the backwashing water flow switching assembly and the filter element assembly, which can drive the scraping frame to rotate circumferentially when the water inlet is connected to the backwashing cavity. The advantages of the invention are: simple structure and convenient switching of the flow direction of water flow in the backwashing and filtering states.

Description

Technical Field

[0001] The invention relates to the field of filter equipment, in particular to a backwashing filter. Background Art

[0002] As environmental pollution becomes increasingly serious, water quality is getting worse and worse. Therefore, water filters as a water quality filtration device are becoming more and more popular. Among them, the pre-filter, as a reliable impurity filtration device, is the first coarse filtration equipment for the whole house water. It can effectively filter the mud, rust, and large particles in the tap water. The accuracy range of the pre-filter screen varies from 5 to 30 microns according to different brands and models. It mainly removes the precipitated impurities and bacteria, microbial debris, rust, sand and mud and other particle impurities larger than 5 microns generated by the pipeline to avoid harm to the human body and skin; and it can also effectively filter the mud, rust, and sand in the downstream pipelines, water purifiers, water heaters, washing machines, etc. It plays a positive protective role in washing machines, high-end faucets and showers. However, the commonly used pre-filter does not have a backwashing function, which causes the dirt particles in the water to hang on the filter material of the filter. As time goes by, the filter material is mixed in, which can easily cause the filter material to be blocked, affecting the amount of water filtered by the filter and even reducing the filtering effect of the filter material. Therefore, the filter needs to be cleaned or updated regularly to maintain the water flow and filtering effect of the filter. The cleaning of the pre-filter requires disassembly, which is inconvenient for users. At the same time, the existing backwashing filter has a complex structure and it is inconvenient to switch the water flow direction in the backwashing and filtering states.

[0003] In order to solve the deficiencies of the prior art, people have conducted long-term exploration and proposed various solutions. For example, a Chinese patent document discloses a backwash pre-filter [CN201420630652.9], which includes a backwash valve, the backwash valve is provided with a water inlet port and a water outlet port opening in a horizontal direction, the upper end of the backwash valve is provided with a backwash valve body port, the backwash valve core, the backwash valve sealing ring, the backwash valve body top cover and the backwash knob are installed in sequence from bottom to top at the backwash valve body port; the lower end of the backwash valve is connected to a filter cylinder, the filter cylinder is installed with a filter element; the lower end of the filter cylinder is connected to a sewage valve body.

[0004] The above solution solves the problem of the existing filter being troublesome to disassemble and use when cleaning the internal filter material to a certain extent, but the solution still has many shortcomings, such as: the backwashing structure is complicated, and it is inconvenient to switch the water flow direction between backwashing and filtering. Summary of the invention

[0005] The object of the present invention is to provide a backwash filter with reasonable design, simple structure and convenient water flow direction switching in view of the above problems.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical scheme: the backwash filter comprises a filter cup body, an end cover with a water inlet and a water outlet is provided at the upper end of the filter cup body, a sewage discharge assembly with a sewage discharge outlet is provided at the lower end of the filter cup body, a cylindrical filter element assembly is movably provided on the circumferential inner side of the filter cup body, and a scraping frame is sleeved on the circumferential outer side of the filter element assembly, an annular raw water cavity is provided between the circumferential outer side of the filter element assembly and the circumferential inner side of the filter cup body, and a clean water cavity is provided on the circumferential inner side of the filter element assembly, a backwash cavity is provided in the end cover, the clean water cavity is connected with the backwash cavity through a one-way flow guide structure arranged at the upper end of the filter element assembly, and a backwash water flow switching assembly for connecting the backwash cavity with the water inlet or the water outlet is provided on the end cover, and a scraping drive mechanism is provided between the backwash water flow switching assembly and the filter element assembly, which can drive the scraping frame to rotate circumferentially when the water inlet is connected to the backwash cavity. When normal filtration is performed, the channel between the water inlet and the raw water chamber is closed by rotating the backwash water flow switching component, and the channel between the raw water chamber and the water outlet is opened, so that the flow direction of the water in the filtration state can be achieved. When backwashing is performed, the channel between the water inlet and the raw water chamber is opened by rotating the backwash water flow switching component, and the channel between the raw water chamber and the water outlet is closed, so that the flow direction of the water in the backwashing state can be achieved. Not only is the structure simple, but the switching of the water flow direction in the backwashing and filtration states is also more convenient.

[0007] In the above-mentioned backwash filter, the backwash water flow switching assembly includes a water flow switching body rotatably arranged on the inner side of the end cover in the circumferential direction, the water flow switching body is connected to a water flow direction switching driving assembly capable of driving the water flow switching body to rotate circumferentially in the end cover, and the backwash chamber is formed in the water flow switching body, and the water flow switching body is provided with a water flow direction switching structure capable of connecting the backwash chamber with the water inlet or the water outlet when the water flow switching body rotates. The water flow switching body can be synchronously rotated by rotating the water flow direction switching driving assembly, so that the water flow direction switching structure can close the channel between the backwash chamber and the water inlet or the water inlet, which not only has good linkage performance but also is easy to operate.

[0008] In the above-mentioned backwash filter, the water flow direction switching drive assembly includes a switching body connection part connected to the upper end of the water flow switching body and extending to the circumferential outer side of the end cover, and the switching body connection part is connected to the backwash switching knob; or, the switching body connection part is connected to the electric driver. The water flow state can be quickly switched by using the backwash switching knob or the electric driver, saving time and effort.

[0009] In the above-mentioned backwashing filter, the water flow direction switching structure includes a water inlet and a water outlet which are arranged on the water flow switching body and are respectively connected to the backwashing chamber, and the water inlet and the water outlet are arranged in an L-shaped staggered manner and are connected to each other to form the above-mentioned backwashing chamber, the water inlet corresponds to the first water retaining part, the water outlet corresponds to the second water retaining part, and when the water inlet is connected to the water inlet, the first water retaining part is blocked at the end of the water outlet, or, when the water outlet is connected to the water outlet, the second water retaining part is blocked at the end of the water inlet. This arrangement allows the backwashing chamber to be connected to only one of the water inlet or the water outlet.

[0010] In the above-mentioned backwash filter, the lower end of the water flow switching body is provided with a recoil gear member located on the circumferential outer side of the upper end of the filter element assembly, the upper end of the recoil gear member is provided with a plurality of filter guide holes that can connect the water inlet and the raw water chamber when the water outlet is connected to the water outlet and the second water retaining portion is blocked at the end of the water inlet, and the lower end of the recoil gear member is provided with a backwash guide hole that can connect the backwash chamber and the raw water chamber when the water inlet is connected to the water inlet and the first water retaining portion is blocked at the end of the water outlet. The filter guide hole facilitates water flow from the water inlet into the raw water chamber, and the backwash guide hole can make water flow from the backwash chamber impact the recoil gear member, thereby driving the scraping frame to rotate.

[0011] In the above-mentioned backwash filter, the scraping and washing driving mechanism includes a tooth mouth of a recoil gear formed on the circumferential outer side of the lower end of the recoil gear, and a hydraulic rotating member corresponding to the backwashing guide hole is rotatably arranged between the tooth mouth of the recoil gear and the backwashing guide hole, and the hydraulic rotating member is connected to the scraping and washing frame. Since the recoil gear is relatively fixed, when the water flow impacts the tooth mouth of the recoil gear, the hydraulic rotating member generates a reverse driving force to rotate the scraping and washing frame.

[0012] In the above-mentioned backwash filter, the hydraulic rotating member is in the shape of an impeller, and the lower end of the tooth opening of the recoil gear is open and the opening faces the raw water chamber.

[0013] In the above-mentioned backwash filter, the filter element assembly includes a filter element cylinder body which is cylindrical and has a plurality of through holes in the circumference. The upper and lower ends of the filter element cylinder body are respectively closed, a filter screen is sleeved on the circumferential outer side of the filter element cylinder body, and the scraping frame is respectively in contact with the circumferential inner wall of the filter cup body and / or the circumferential outer wall of the filter screen.

[0014] In the above-mentioned backwash filter, the one-way flow guide structure includes a mounting hole arranged at the upper end of the filter cartridge body, a one-way water flow barrier is movably arranged in the mounting hole, and one end of the one-way water flow barrier extends to the outside of the filter cartridge body, and the other end is located inside the filter cartridge body, and one end of the one-way water flow barrier located outside the filter cartridge body is provided with a water retaining portion abutting against the circumferential outer side of the mounting hole, and the one-way water flow barrier has an elastic support structure that can keep the water retaining portion abutting against the circumferential outer side of the mounting hole. The one-way flow guide structure can allow water in the clean water chamber to enter the backwash chamber, while water in the backwash chamber cannot enter the clean water chamber.

[0015] In the above-mentioned backwash filter, the elastic support structure includes an elastic member which is sleeved on one end of the one-way water flow barrier located on the inner side of the filter element cylinder, and one end of the elastic member acts on the inner side of the filter element cylinder, and the other end acts on a limiting portion arranged on the one end of the one-way water flow barrier away from the water retaining portion.

[0016] Compared with the existing technology, the advantages of the present invention are: simple structure, through the cooperation of the backwash water flow switching component and the one-way guide structure, the flow direction of water in the normal filtering state and the backwashing state can be realized, not only the linkage is better, but also the operation is convenient and more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 It is a structural cross-sectional view of the present invention;

[0019] Figure 3 It is a vertical cross-sectional view of the water flow direction during filtration of the present invention;

[0020] Figure 4 is a transverse cross-sectional view of the water flow direction during filtration of the present invention;

[0021] Figure 5 It is a vertical cross-sectional view of the water flow direction during backwashing of the present invention;

[0022] Figure 6 It is a transverse cross-sectional view of the water flow direction during backwashing of the present invention.

[0023] In the figure, the filter cup body 1, the raw water chamber 11, the end cover 2, the water inlet 21, the water outlet 22, the backwash chamber 23, the sewage discharge component 3, the sewage discharge port 31, the filter element component 4, the scraping frame 41, the clean water chamber 42, the filter element cylinder 43, the filter screen 44, the one-way flow guide structure 5, the mounting hole 51, the one-way water flow barrier 52, the water retaining part 53, the elastic support structure 54, the elastic part 541, the limit part 542, the backwash water flow switching component 6, the water Flow switching body 61, water flow direction switching drive assembly 62, switching body connecting part 621, backwash switching knob 622, electric driver 623, water flow direction switching structure 63, water inlet part 631, water outlet part 632, first water retaining part 633, second water retaining part 634, scraping and washing drive mechanism 7, recoil gear part tooth mouth part 71, hydraulic rotating part 72, recoil gear part 8, filtration guide hole 81, backwash guide hole 82. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] like Figure 1-6 As shown, the backwash filter comprises a filter cup 1, an end cap 2 having a water inlet 21 and a water outlet 22 is provided at the upper end of the filter cup 1, a sewage discharge assembly 3 having a sewage discharge port 31 is provided at the lower end of the filter cup 1, a cylindrical filter element assembly 4 is movably provided on the inner side of the filter cup 1, and a scraping frame 41 is sleeved on the outer side of the filter element assembly 4, an annular raw water cavity 11 is provided between the outer side of the filter element assembly 4 and the inner side of the filter cup 1, and the inner side of the filter element assembly 4 has a There is a clean water chamber 42, and a backwash chamber 23 is provided in the end cover 2. The clean water chamber 42 is connected with the backwash chamber 23 through a one-way flow guide structure 5 arranged on the upper end of the filter element assembly 4, and a backwash water flow switching assembly 6 for connecting the backwash chamber 23 with the water inlet 21 or the water outlet 22 is provided on the end cover 2, and a scraping drive mechanism 7 is provided between the backwash water flow switching assembly 6 and the filter element assembly 4, which can drive the scraping frame 41 to rotate circumferentially when the water inlet 21 is connected with the backwash chamber 23. When normal filtration is performed, the backwash water flow switching component 6 is rotated to close the channel between the water inlet 21 and the raw water chamber 11, and the channel between the raw water chamber 11 and the water outlet 22 is opened, so that the flow direction of the water in the filtration state can be achieved. When backwashing is performed, the backwash water flow switching component 6 is rotated to open the channel between the water inlet 21 and the raw water chamber 11, and the channel between the raw water chamber 11 and the water outlet 22 is closed, so that the flow direction of the water in the backwashing state can be achieved. Not only is the structure simple, but the switching of the water flow direction in the backwashing and filtration states is also more convenient.

[0026] The backwash water flow switching assembly 6 includes a water flow switching body 61 rotatably arranged on the inner side of the end cover 2 in the circumferential direction, the water flow switching body 61 is connected to a water flow direction switching driving assembly 62 capable of driving the water flow switching body 61 to rotate circumferentially in the end cover 2, and the backwash chamber 23 is formed in the water flow switching body 61, and a water flow direction switching structure 63 is arranged in the water flow switching body 61, which can connect the backwash chamber 23 with the water inlet 21 or the water outlet 22 when the water flow switching body 61 rotates. The outer arc shape of the water flow direction switching structure 63 here is arranged to fit the inner wall of the end cover 2.

[0027] Further, the water flow direction switching drive assembly 62 includes a switching body connection portion 621 connected to the upper end of the water flow switching body 61 and extending to the circumferential outer side of the end cover 2, and the switching body connection portion 621 is connected to the backwash switching knob 622; or, the switching body connection portion 621 is connected to the electric driver 623. The upper end of the backwash switching knob 622 is provided with a pressure gauge for detecting the air pressure in the backwash chamber.

[0028] It can be seen that the water flow direction switching structure 63 includes a water inlet 631 and a water outlet 632 which are arranged on the water flow switching body 61 and are respectively connected to the backwash chamber 23, and the water inlet 631 and the water outlet 632 are L-shaped staggered and interconnected to form the above-mentioned backwash chamber 23, the water inlet 631 and the first water retaining portion 633 correspond to each other, the water outlet 632 and the second water retaining portion 634 correspond to each other, and when the water inlet 631 is connected to the water inlet 21, the first water retaining portion 633 is blocked at the end of the water outlet 22, or, when the water outlet 632 is connected to the water outlet 22, the second water retaining portion 634 is blocked at the end of the water inlet 21.

[0029] Obviously, the lower end of the water flow switching body 61 is provided with a recoil gear member 8 located on the circumferential outer side of the upper end of the filter element assembly 4, and the upper end of the recoil gear member 8 is provided with a plurality of filtering guide holes 81 that can connect the water inlet 21 with the raw water chamber 11 when the water outlet 632 is connected to the water outlet 22 and the second water retaining portion 634 is blocked at the end of the water inlet 21, and the lower end of the recoil gear member 8 is provided with a backwashing guide hole 82 that can connect the backwashing chamber 23 with the raw water chamber 11 when the water inlet 631 is connected to the water inlet 21 and the first water retaining portion 633 is blocked at the end of the water outlet 22. The filtering guide hole 81 facilitates water flow from the water inlet 21 to enter the raw water chamber 11, and the backwashing guide hole 82 can make the water flow from the backwashing chamber 23 impact the recoil gear member 8, thereby driving the scraping frame 41 to rotate.

[0030] Specifically, the scraping and washing driving mechanism 7 includes a recoil gear tooth mouth portion 71 formed on the circumferential outer side of the lower end of the recoil gear 8, and a hydraulic rotating member 72 corresponding to the backwashing guide hole 82 is rotatably arranged between the recoil gear tooth mouth portion 71 and the backwashing guide hole 82, and the hydraulic rotating member 72 is connected to the scraping and washing frame 41. When the water flow impacts the recoil gear tooth mouth portion 71, the hydraulic rotating member 72 can generate a reverse thrust to drive the scraping and washing frame 41 to rotate and scrape the filter element cylinder 43 and the filter screen 44.

[0031] Furthermore, the hydraulic rotating member 72 is in the shape of an impeller, and the lower end of the tooth opening of the recoil gear is open and the opening faces the raw water chamber 11 .

[0032] Preferably, the filter element assembly 4 includes a filter element cylinder 43 which is cylindrical and has a plurality of through holes circumferentially. The upper and lower ends of the filter element cylinder 43 are respectively closed, a filter screen 44 is sleeved on the circumferential outer side of the filter element cylinder 43, and the scraping and washing frame 41 is respectively in contact with the circumferential inner wall of the filter cup body 1 and / or the circumferential outer wall of the filter screen 44.

[0033] In detail, the one-way flow guide structure 5 includes a mounting hole 51 disposed at the upper end of the filter cartridge body 43, a one-way water flow barrier 52 is movably provided in the mounting hole 51, and one end of the one-way water flow barrier 52 extends to the outside of the filter cartridge body 43, and the other end is located inside the filter cartridge body 43, and one end of the one-way water flow barrier 52 located outside the filter cartridge body 43 is provided with a water retaining portion 53 abutting against the circumferential outer side of the mounting hole 51, and the one-way water flow barrier 52 is provided with an elastic support structure 54 that can keep the water retaining portion 53 abutting against the circumferential outer side of the mounting hole 51. A plurality of one-way water flow barrier silicone pieces are provided on the circumferential outer side of the part of the one-way water flow barrier 52 located inside the filter cartridge body 43.

[0034] More specifically, the elastic support structure 54 includes an elastic member 541 which is sleeved on one end of the one-way water flow barrier 52 located on the inner side of the filter cartridge cylinder 43, and one end of the elastic member 541 acts on the inner side of the filter cartridge cylinder 43, and the other end acts on a limiting portion 542 arranged on the one end of the one-way water flow barrier 52 away from the water retaining portion 53.

[0035] The principle of this embodiment is that when backwashing is performed, the backwashing switching knob 622 is turned or the electric driver 623 is used to make the switching body connecting part 621 drive the water flow direction switching structure 63 to rotate, so that the water inlet part 631 is connected with the water inlet 21 and the first water retaining part 633 is blocked at the end of the water outlet 22. At this time, the water flows into the backwashing chamber 23 from the water inlet part 631. Due to the setting of the one-way flow guide structure 5, the water flows out from the backwashing guide hole 82 and impacts the tooth mouth part 71 of the recoil gear part, so that the hydraulic rotating part 72 forms a reverse thrust and drives the scraping frame 41 to rotate. The filter element cylinder 43 and the filter screen 44 are scraped and cleaned, and the scraped sewage flows out through the sewage outlet 31; when normal filtration is performed, the water outlet 632 is connected to the water outlet 22 through the backwash water flow switching component 6 and the second water retaining part 634 is blocked at the end of the water inlet 21. At this time, the water flows into the raw water chamber 11 from the filter guide hole 81 and is filtered by the filter element component 4. The water flows from the clean water chamber 42 through the one-way guide structure 5 into the backwash chamber 23. Since the water outlet 632 and the water outlet 22 are connected to each other, the water flows from the backwash chamber 23 into the water outlet 22 to complete the filtration.

[0036] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0037] Although the present invention makes more use of the filter cup body 1, the raw water cavity 11, the end cover 2, the water inlet 21, the water outlet 22, the backwash cavity 23, the sewage discharge component 3, the sewage discharge port 31, the filter element component 4, the scraping frame 41, the clean water cavity 42, the filter element cylinder 43, the filter screen 44, the one-way flow guide structure 5, the mounting hole 51, the one-way water flow barrier 52, the water retaining part 53, the elastic support structure 54, the elastic part 541, the limit part 542, the backwash water flow switching component 6, and the water flow switching body 61, the filter element 41 is a filter element. , water flow direction switching drive assembly 62, switching body connecting part 621, backwashing switching knob 622, electric driver 623, water flow direction switching structure 63, water inlet 631, water outlet 632, first water retaining part 633, second water retaining part 634, scraping and washing drive mechanism 7, tooth mouth part of recoil gear part 71, hydraulic rotating part 72, recoil gear part 8, filtering guide hole 81, backwashing guide hole 82 and other terms, but the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A backwash filter, comprising a filter cup (1), the upper end of the filter cup (1) being provided with an end cover (2) having a water inlet (21) and a water outlet (22), the lower end of the filter cup (1) being provided with a sewage discharge assembly (3) having a sewage discharge port (31), a cylindrical filter element assembly (4) being movably provided on the inner side of the filter cup (1), and a scraping frame (41) being sleeved on the outer side of the filter element assembly (4), an annular raw water cavity (11) being provided between the outer side of the filter element assembly (4) and the inner side of the filter cup (1), and a clean water cavity (42) being provided on the inner side of the filter element assembly (4), characterized in that: The end cover (2) has a backwash chamber (23) therein, the clean water chamber (42) is connected to the backwash chamber (23) via a one-way flow guide structure (5) arranged at the upper end of the filter element assembly (4), and the end cover (2) is provided with a backwash water flow switching assembly (6) for connecting the backwash chamber (23) with the water inlet (21) or the water outlet (22), and a scraping drive mechanism (7) is provided between the backwash water flow switching assembly (6) and the filter element assembly (4) for driving the scraping frame (41) to rotate in a circumferential direction when the water inlet (21) is connected to the backwash chamber (23); the backwash chamber (23) is connected to the filter element assembly (4) by the backwash chamber (23) and the clean water chamber (42). The flushing water flow switching assembly (6) comprises a water flow switching body (61) rotatably arranged on the inner side of the end cover (2) in the circumferential direction, the water flow switching body (61) being connected to a water flow direction switching driving assembly (62) capable of driving the water flow switching body (61) to rotate in the circumferential direction within the end cover (2), the backwashing chamber (23) being formed in the water flow switching body (61), and a water flow direction switching structure (63) capable of connecting the backwashing chamber (23) with the water inlet (21) or the water outlet (22) when the water flow switching body (61) rotates; the water flow switching body (61) The lower end of the recoil gear member (8) is provided with a recoil gear member (8) located on the circumferential outer side of the upper end of the filter element assembly (4); the upper end of the recoil gear member (8) is provided with a plurality of filtering guide holes (81) that can connect the water inlet (21) and the raw water chamber (11) when the water outlet (632) is connected to the water outlet (22) and the second water retaining portion (634) is blocked at the end of the water inlet (21); and the lower end of the recoil gear member (8) is provided with a plurality of filtering guide holes (81) that can connect the water inlet (21) and the raw water chamber (11) when the water outlet (632) is connected to the water outlet (22) and the first water retaining portion (634) is blocked at the end of the water outlet (22). The scraping and washing driving mechanism (7) comprises a recoil gear tooth mouth portion (71) formed on the circumferential outer side of the lower end of the recoil gear member (8), and a hydraulic rotating member (72) corresponding to the backwashing guide hole (82) is rotatably arranged between the recoil gear tooth mouth portion (71) and the backwashing guide hole (82), and the hydraulic rotating member (72) is connected to the scraping and washing frame (41); the hydraulic rotating member (72) is in the shape of an impeller, and the lower end of the recoil gear tooth mouth portion (71) is open and the opening faces the raw water chamber (11);The one-way flow guide structure (5) comprises a mounting hole (51) arranged at the upper end of the filter cartridge body (43), a one-way water flow barrier (52) movably penetrated in the mounting hole (51), one end of the one-way water flow barrier (52) extends to the outside of the filter cartridge body (43), and the other end is located on the inside of the filter cartridge body (43), the one-way water flow barrier (52) is provided with a water retaining portion (53) abutting against the outer side of the mounting hole (51) in the circumferential direction at the end of the one-way water flow barrier (52) located on the outside of the filter cartridge body (43), and the one-way water flow barrier (52) is provided with a water retaining portion (53) abutting against the outer side of the mounting hole (51) in the circumferential direction at the end of the one-way water flow barrier (52) located on the outside of the filter cartridge body (43). The barrier (52) has an elastic support structure (54) capable of keeping the water retaining portion (53) against the outer side of the mounting hole (51) in a circumferential direction; the elastic support structure (54) comprises an elastic member (541) sleeved on one end of the one-way water flow barrier (52) located inside the filter cartridge body (43); one end of the elastic member (541) acts on the inner side of the filter cartridge body (43), and the other end acts on a limiting portion (542) provided on the one end of the one-way water flow barrier (52) away from the water retaining portion (53).

2. The backwash filter according to claim 1, characterized in that: The water flow direction switching drive assembly (62) comprises a switching body connecting portion (621) connected to the upper end of the water flow switching body (61) and extending to the circumferential outer side of the end cover (2), and the switching body connecting portion (621) is connected to the backwash switching knob (622); or, the switching body connecting portion (621) is connected to the electric driver (623).

3. The backwash filter according to claim 2, characterized in that: The water flow direction switching structure (63) comprises a water inlet (631) and a water outlet (632) which are arranged on the water flow switching body (61) and are respectively connected to the backwash chamber (23), and the water inlet (631) and the water outlet (632) are arranged in an L-shaped staggered manner and are connected to each other to form the above-mentioned backwash chamber (23), the water inlet (631) and the first water retaining portion (633) correspond to each other, and the water outlet (632) and the second water retaining portion (634) correspond to each other, and when the water inlet (631) is connected to the water inlet (21), the first water retaining portion (633) is blocked at the end of the water outlet (22), or, when the water outlet (632) is connected to the water outlet (22), the second water retaining portion (634) is blocked at the end of the water inlet (21).

4. The backwash filter according to claim 1, characterized in that: The filter element assembly (4) comprises a filter element cylinder (43) which is cylindrical and has a plurality of through holes in the circumferential direction. The upper and lower ends of the filter element cylinder (43) are respectively closed. A filter screen (44) is sleeved on the circumferential outer side of the filter element cylinder (43). The scraping and washing frame (41) is respectively in contact with the circumferential inner wall of the filter cup body (1) and / or the circumferential outer wall of the filter screen (44).

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