Automatic backwash filter

Abstract

The present invention provides an automatic backwash filter, which solves the problems of inconvenient cleaning inside the filter and insufficient internal sealing. The filter includes a filter cup, an end cap with a water inlet and a water outlet can be detachably provided at the upper end of the filter cup, a sewage discharge assembly with a sewage discharge outlet is provided at the lower end, a hydraulic movable filter assembly is movably provided on the inner side of the filter cup in the circumferential direction, and an elastic top pressure assembly is connected to the lower end of the filter cup, a raw water cavity is provided between the outer side of the hydraulic movable filter assembly and the inner side of the filter cup in the circumferential direction, and a clean water cavity connected to the water outlet is provided on the inner side of the hydraulic movable filter assembly in the circumferential direction, and a cup body rotating scraper is sleeved on the outer side of the hydraulic movable filter assembly in the circumferential direction, a backwashing filtering structure is provided at the upper end of the hydraulic movable filter assembly, and a sealing structure is provided between the upper end of the hydraulic movable filter assembly and the upper end of the cup body rotating scraper, and a connecting structure is provided at the lower end of the cup body rotating scraper. The present invention has the advantages of good internal sealing and convenient cleaning.

Description

Technical Field

[0001] The invention belongs to the technical field of filters, and in particular relates to an automatic backwashing filter. Background Art

[0002] The filter is an indispensable device on the pipeline for conveying media. It is usually installed at the inlet end of the pressure reducing valve, pressure relief valve, water level valve, and other equipment of Fanggong filter. The filter consists of a cylinder, a stainless steel filter, a sewage discharge part, a transmission device, and an electrical control part. After the water to be treated passes through the filter cartridge of the filter screen, its impurities are blocked. However, in actual use, the internal filter screen of the filter will be blocked by impurities after long-term use and it is inconvenient to clean. In addition, there is a problem of too large a gap inside the filter, which leads to insufficient sealing of the filter screen after installation, thus affecting the filtering effect.

[0003] In order to solve the deficiencies in existing technologies, people have conducted long-term explorations and proposed a variety of solutions. For example, a Chinese patent document discloses a double scraping filter [201720921238.7], which includes a hollow outer cylinder, an end cover with a water inlet and a water outlet is connected to the upper end of the outer cylinder, a filter cylinder concentric with the outer cylinder and in a cylindrical shape is provided in the outer cylinder through a circumferential positioning structure, and the circumferential outer side of the filter cylinder and the circumferential inner side of the outer cylinder form a raw water cavity in an annular shape and connected to the water inlet, the lower end of the filter cylinder is closed and the circumferential inner side of the filter cylinder forms a clean water cavity connected to the water outlet, a scraping frame located in the raw water cavity is sleeved on the circumferential outer side of the filter cylinder, the lower end of the scraping frame is circumferentially fixedly connected to the sewage discharge assembly penetrating the lower end of the outer cylinder, the scraping frame is circumferentially rotatably connected relative to the filter cylinder and the outer cylinder respectively, and the circumferential outer side of the scraping frame has a first scraping structure in contact with the circumferential inner wall of the outer cylinder, and the circumferential inner side of the scraping frame has a second scraping structure in contact with the circumferential outer wall of the filter cylinder.

[0004] The above solution solves the problem of inconvenient cleaning inside the filter to a certain extent, but the solution still has many shortcomings, such as insufficient sealing inside the filter. Summary of the invention

[0005] The object of the present invention is to provide an automatic backwashing filter with reasonable design and good internal sealing effect in view of the above problems.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: the automatic backwashing filter comprises a filter cup body, the upper end of the filter cup body is detachably provided with an end cover with a water inlet and a water outlet, the lower end is provided with a sewage discharge assembly with a sewage discharge outlet, a cylindrical water pressure movable filter screen assembly is movably provided on the circumferential inner side of the filter cup body, and an elastic top pressure assembly is connected to the lower end of the filter cup body, an annular raw water cavity is provided between the circumferential outer side of the water pressure movable filter screen assembly and the circumferential inner side of the filter cup body, and the circumferential inner side of the water pressure movable filter screen assembly is provided with a clean water cavity connected with the water outlet, and the circumferential outer side of the water pressure movable filter screen assembly is sleeved with a cylindrical cup body rotating scraper located in the raw water cavity, a backwashing filtering structure having a backwashing channel that can connect the water inlet and the clean water cavity is provided on the upper end of the water pressure movable filter screen assembly, and a sealing structure that can close the backwashing channel is provided between the upper end of the water pressure movable filter screen assembly and the upper end of the cup body rotating scraper, and a connecting structure connected with the sewage discharge assembly is provided at the lower end of the cup body rotating scraper. By setting up a sealing structure, the backwash channel between the water inlet and the water outlet can be isolated to prevent sewage from flowing into the water purification chamber during filtration, thereby improving the sealing between the hydraulic movable filter assembly and the cup body rotating scraper.

[0007] In the above-mentioned automatic backwashing filter, the hydraulic movable filter screen assembly includes a cylindrical lifting filter cartridge body, the upper end of the lifting filter cartridge body is open, the lower end is closed, and the lifting filter cartridge body has a filter screen body around it.

[0008] In the above-mentioned automatic backwashing filter, the backwashing filter structure includes a cylindrical backwashing filter cartridge body arranged at the upper end of the lifting filter cartridge body, the backwashing filter cartridge body and the lifting filter cartridge body are connected internally, the lifting filter cartridge body has a plurality of water inlets in the circumference, and the lifting filter cartridge body is provided with a small filter screen body in the circumference, and the water inlet, the water inlet and the clean water cavity are sequentially connected to form a backwashing channel. The small filter screen body and the water inlet can guide water from the water inlet into the clean water cavity, thereby flushing out impurities on the outside of the lifting filter cartridge body from the sewage discharge assembly at the lower end.

[0009] In the above-mentioned automatic backwashing filter, the cup body rotating scraper comprises a rotating scraper cylinder coaxially sleeved on the circumferential outer side of the backwashing filter cylinder, the upper end of the rotating scraper cylinder is provided with a scraper cylinder mounting seat connected to the filter cup body through a circumferential positioning structure, and the scraper cylinder mounting seat is provided with a plurality of through holes connected to the water inlet respectively on the circumferential outer side. Water can flow into the clean water chamber or the raw water chamber from the through holes.

[0010] In the above-mentioned automatic backwashing filter, the sealing structure includes a sealing cylinder body which is coaxially arranged at the upper end of the scraper cylinder mounting seat and is in a cylindrical shape, and the through holes are circumferentially and evenly arranged at the lower end of the sealing cylinder body, the backwashing filter cylinder body is penetrated into the sealing cylinder body, and a sealing assembly is arranged between the backwashing filter cylinder body and the sealing cylinder body, an annular sealing body is provided at the upper end of the lifting filter cylinder body, and an annular sealing surface corresponding to the through hole is formed on one side of the annular sealing body, and the lower end of the sealing cylinder body is abutted against the annular sealing surface under the action of the elastic top pressure assembly.

[0011] In the above-mentioned automatic backwashing filter, the sealing assembly includes a sealing ring installation groove arranged on the circumferential outer side of the backwashing filter cylinder, and a sealing ring body in contact with the circumferential inner wall of the sealing cylinder is arranged in the sealing ring installation groove.

[0012] In the above-mentioned automatic backwashing filter, the circumferential positioning structure includes a plurality of positioning convex strips arranged on the circumferential outer side of the scraper drum mounting seat, and a positioning groove corresponding to the positioning convex strips is arranged on the circumferential inner side of the upper end of the filter cup body, and the positioning convex strips are inserted into the positioning grooves; the lower end of the scraper drum mounting seat is inserted into the upper end of the rotating scraper drum body, and the scraper drum mounting seat and the rotating scraper drum body are connected in circumferential rotation. The circumferential positioning structure ensures that the scraper drum mounting seat and the filter cup body remain relatively fixed.

[0013] In the above-mentioned automatic backwashing filter, the communication structure includes a scraper base formed at the lower end of the rotating scraper body, and the scraper base has a plurality of openings in the circumference, and the openings are respectively connected to the sewage outlet.

[0014] In the above-mentioned automatic backwash filter, the sewage discharge assembly includes a sewage discharge member rotatably arranged at the lower end of the filter cup body and having a sewage discharge port, and the upper end of the sewage discharge member is penetrated through the lower end of the scraper base and the sewage discharge member and the scraper base are circumferentially positioned and connected.

[0015] In the above-mentioned automatic backwashing filter, the elastic pressing assembly includes a pressing spring arranged between the scraper base and the lifting filter cartridge body, and one end of the pressing spring acts on the scraper base, and the other end acts on the bottom of the lifting filter cartridge body. The pressing spring presses the lifting filter cartridge body upward to ensure that the upper and lower ends of the lifting filter cartridge base are isolated.

[0016] Compared with the existing technology, the advantages of the present invention are: the impurities accumulated inside the filter can be automatically removed through the backwash structure; the dirt on the outside of the filter can be scraped off in time by adding a rotating scraper cylinder; and a sealing structure is added to the upper end of the water pressure movable filter assembly to improve the sealing isolation inside the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural cross-sectional view of the present invention during filtration;

[0018] Figure 2 This is a structural cross-sectional view of the present invention during automatic backwashing;

[0019] Figure 3 It is a schematic diagram of the structure expansion of the present invention;

[0020] In the figure, filter cup body 1, raw water chamber 11, clean water chamber 12, end cover 2, water inlet 21, water outlet 22, sewage discharge component 3, sewage discharge port 31, sewage discharge part 32, water pressure movable filter screen component 4, backwashing filter structure 41, backwashing channel 42, lifting filter cylinder body 43, filter screen body 44, backwashing filter cylinder body 45, water inlet 46, small filter screen body 47, elastic top pressure component 5, top pressure spring 51, cup body rotating scraper 6, rotating scraper cylinder body 61, scraper cylinder mounting seat 62, through hole 63, sealing structure 7, sealing cylinder body 71, sealing component 72, annular sealing body 73, annular sealing surface 74, sealing ring mounting groove 75, sealing ring body 76, connecting structure 8, scraper cylinder base 81, opening 82, circumferential positioning structure 9, positioning convex strip 91, positioning groove 92. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] like Figure 1-3 As shown, the automatic backwash filter comprises a filter cup 1, the upper end of the filter cup 1 is detachably provided with an end cap 2 having a water inlet 21 and a water outlet 22, the lower end is provided with a sewage discharge assembly 3 having a sewage discharge port 31, a cylindrical water pressure movable filter assembly 4 is movably provided on the inner side of the filter cup 1, and an elastic top pressure assembly 5 is connected to the lower end of the filter cup 1, an annular raw water cavity 11 is provided between the outer side of the water pressure movable filter assembly 4 and the inner side of the filter cup 1, and the inner side of the water pressure movable filter assembly 4 has a water outlet 31 connected to the outlet 31. The water pressure active filter assembly 4 is provided with a cylindrical cup body rotating scraper 6 located in the raw water chamber 11, and the upper end of the water pressure active filter assembly 4 is provided with a backwashing filter structure 41 having a backwashing channel 42 that can connect the water inlet 21 and the water pressure active filter assembly 12, and a sealing structure 7 that can close the backwashing channel 42 is provided between the upper end of the water pressure active filter assembly 4 and the upper end of the cup body rotating scraper 6, and a connecting structure 8 connected to the sewage discharge assembly 3 is provided at the lower end of the cup body rotating scraper 6. When the filter is backwashed, water enters from the water inlet 21, flows into the water pressure active filter assembly 4 from the backwashing channel 42, and then enters the raw water chamber 11 through the water pressure active filter assembly 4, and finally is discharged from the sewage discharge port 31, so as to achieve the purpose of cleaning the outer side of the water pressure active filter assembly 4.

[0023] Furthermore, the hydraulic movable filter assembly 4 comprises a cylindrical lifting filter cylinder body 43, the lifting filter cylinder body 43 is open at the upper end and closed at the lower end, and the lifting filter cylinder body 43 has a filter mesh body 44 around it. Water passes through the filter mesh body 44 to filter out impurities in the water.

[0024] Specifically, the backwash filter structure 41 includes a cylindrical backwash filter cartridge body 45 disposed at the upper end of the lifting filter cartridge body 43, the backwash filter cartridge body 45 is connected to the inside of the lifting filter cartridge body 43, the lifting filter cartridge body 43 has a plurality of water inlets 46 in the circumference, and the lifting filter cartridge body 43 is provided with a small filter body 47 in the circumference, and the water inlet 21, the water inlet 46 and the clean water chamber 12 are sequentially connected to form a backwash channel 42. After the sewage outlet 31 is opened, the backwash channel 42 is connected, and the water inlet 46 transports water from the water inlet 21 to the clean water chamber 12.

[0025] Preferably, the cup body rotating scraper 6 includes a rotating scraper cylinder body 61 coaxially sleeved on the circumferential outer side of the backwash filter cylinder body 45, and the upper end of the rotating scraper cylinder body 61 is provided with a scraper cylinder mounting seat 62 connected to the filter cup body 1 through a circumferential positioning structure 9, and the scraper cylinder mounting seat 62 is provided with a plurality of through holes 63 on the circumferential outer side which are respectively connected to the water inlet 22.

[0026] In addition, the sealing structure 7 includes a cylindrical sealing cylinder 71 coaxially arranged at the upper end of the scraper mounting seat 62, and the through holes 63 are uniformly arranged in the circumferential direction at the lower end of the sealing cylinder 71, the backwash filter cylinder 45 is penetrated in the sealing cylinder 71, and a sealing assembly 72 is arranged between the backwash filter cylinder 45 and the sealing cylinder 71, and an annular sealing body 73 is provided at the upper end of the lifting filter cylinder 43, and an annular sealing surface 74 corresponding to the through hole 63 is formed on one side of the annular sealing body 73, and the lower end of the sealing cylinder 71 is abutted against the annular sealing surface 74 under the action of the elastic pressing assembly 5. When the sewage outlet 31 is closed, the elastic pressing assembly 5 is pressed upward, so that the sealing assembly 72 between the sealing cylinder 71 and the backwash filter cylinder 45 isolates the water inlet 21 from the water outlet 22.

[0027] Specifically, the sealing assembly 72 includes a sealing ring installation groove 75 disposed on the circumferential outer side of the backwash filter cylinder body 45 , and a sealing ring body 76 in contact with the circumferential inner wall of the sealing cylinder body 71 is disposed in the sealing ring installation groove 75 .

[0028] Furthermore, the circumferential positioning structure 9 includes a plurality of positioning convex strips 91 arranged on the circumferential outer side of the scraper barrel mounting seat 62, and a positioning groove 92 corresponding to the positioning convex strips 91 is arranged on the circumferential inner side of the upper end of the filter cup body 1, and the positioning convex strips 91 are inserted into the positioning grooves 92; the lower end of the scraper barrel mounting seat 62 is inserted into the upper end of the rotating scraper barrel body 61, and the scraper barrel mounting seat 62 and the rotating scraper barrel body 61 are connected in a circumferential rotation. The positioning convex strips 91 fix the scraper barrel mounting seat 62 on the inner side of the upper end of the filter cup body 1, wherein the rotating scraper barrel body 61 can rotate to scrape off the dirt inside the filter cup body 1.

[0029] It can be seen that the communication structure 8 includes a scraper base 81 formed at the lower end of the rotating scraper body 61, and the scraper base 81 has a plurality of openings 82 in the circumference, and the openings 82 are respectively connected to the sewage outlet 31. When the sewage outlet 31 is opened, the lifting filter body 43 is lowered to the bottom end under the water flow pressure, and the raw water chamber 11 is connected to the sewage outlet through the opening 82.

[0030] Obviously, the sewage discharge assembly 3 includes a sewage discharge member 32 rotatably disposed at the lower end of the filter cup body 1 and having a sewage discharge port 31, and the upper end of the sewage discharge member 32 is penetrated through the lower end of the scraper base 81, and the sewage discharge member 32 and the scraper base 81 are circumferentially positioned and connected. The cavity at the upper end of the sewage discharge assembly 3 connects the raw water cavity 11 with the sewage discharge port 31.

[0031] Furthermore, the elastic pressing assembly 5 includes a pressing spring 51 disposed between the scraper base 81 and the lifting filter cartridge body 43, and one end of the pressing spring 51 acts on the scraper base 81, and the other end acts on the bottom of the lifting filter cartridge body 43. The expansion and contraction of the pressing spring 51 is controlled by the opening and closing of the sewage outlet 31. When closed, the bottom of the lifting filter cartridge body 43 is not subjected to water flow pressure, and the spring is extended. When the sewage outlet 31 is opened, the bottom of the lifting filter cartridge body 43 is subjected to water flow pressure, compressing the spring.

[0032] The principle of this embodiment is that by adding a sealing structure 7 between the hydraulic active filter assembly 4 and the cup body rotating scraper 6, the water inlet 21 and the clean water chamber 12 are relatively isolated when the filter is filtering; when the filter is flushing, the water inlet 21 is isolated from the raw water chamber 11 to avoid leakage. The top pressure spring 51 in the elastic top pressure assembly 5 is compressed when the sewage outlet 31 is opened, connecting the backwash channel 42, and the water flows from the water inlet 21 through the water inlet 46 into the clean water chamber 12, and then enters the raw water chamber 11 through the filter mesh body 44, thereby flushing the dirt outside the filter mesh body 44.

[0033] 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.

[0034] Although this article uses more terms such as filter cup body 1, raw water chamber 11, clean water chamber 12, end cover 2, water inlet 21, water outlet 22, sewage discharge assembly 3, sewage discharge port 31, sewage discharge part 32, water pressure movable filter screen assembly 4, backwashing filter structure 41, backwashing channel 42, lifting filter cylinder body 43, filter screen body 44, backwashing filter cylinder body 45, water inlet 46, small filter screen body 47, elastic top pressure assembly 5, top pressure spring 51, cup body rotating scraper 6, rotating scraper cylinder body 61, scraper cylinder mounting seat 62, through hole 63, sealing structure 7, sealing cylinder body 71, sealing assembly 72, annular sealing body 73, annular sealing surface 74, sealing ring mounting groove 75, sealing ring body 76, connecting structure 8, scraper cylinder base 81, opening 82, circumferential positioning structure 9, positioning convex strip 91, positioning groove 92, etc., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the present invention; any additional limitations interpreted as them are contrary to the spirit of the present invention.

Claims

1. An automatic backwash filter, comprising a filter cup (1), the filter cup (1) having an end cover (2) with a water inlet (21) and a water outlet (22) detachably disposed at its upper end, a sewage discharge assembly (3) with a sewage discharge outlet (31) disposed at its lower end, a cylindrical hydraulic movable filter assembly (4) movably disposed on the inner circumferential side of the filter cup (1), and an elastic top pressure assembly (5) connected to the lower end of the filter cup (1), an annular raw water cavity (11) being disposed between the outer circumferential side of the hydraulic movable filter assembly (4) and the inner circumferential side of the filter cup (1), a clean water cavity (12) communicating with the water outlet (22) being disposed on the inner circumferential side of the hydraulic movable filter assembly (4), and a cylindrical cup body rotating scraper (6) being disposed in the raw water cavity (11) being sleeved on the outer circumferential side of the hydraulic movable filter assembly (4), characterized in that: The upper end of the hydraulic movable filter assembly (4) is provided with a backwashing filter structure (41) having a backwashing channel (42) that can connect the water inlet (21) and the clean water chamber (12), and a sealing structure (7) that can close the backwashing channel (42) is provided between the upper end of the hydraulic movable filter assembly (4) and the upper end of the cup body rotating scraper (6), and the lower end of the cup body rotating scraper (6) is provided with a connecting structure (8) connected to the sewage discharge assembly (3); the hydraulic movable filter assembly (4) includes a cylindrical lifting filter body (43), the upper end of the lifting filter body (43) is open, the lower end is closed, and the lifting filter body (43) has a filter body (44) in the circumferential direction; the backwashing The filtering structure (41) comprises a cylindrical backwashing filter cartridge (45) disposed at the upper end of the lifting filter cartridge (43); the backwashing filter cartridge (45) and the lifting filter cartridge (43) are internally connected; the lifting filter cartridge (43) has a plurality of water inlets (46) in the circumferential direction; the lifting filter cartridge (43) is provided with a small filter screen (47) in the circumferential direction; and the water inlet (21), the water inlet (46) and the clean water chamber (12) are sequentially connected to form a backwashing channel (42); the cup body rotating scraper (6) comprises a rotating scraper cylinder (61) coaxially sleeved on the circumferential outer side of the backwashing filter cartridge (45); the upper end of the rotating scraper cylinder (61) is provided with a circumferential positioning structure (9) connected to the filter cup. The scraper mounting seat (62) is connected to the body (1), and the scraper mounting seat (62) is provided with a plurality of through holes (63) respectively connected to the water inlet (21) on the circumferential outer side; the sealing structure (7) comprises a sealing cylinder (71) coaxially arranged at the upper end of the scraper mounting seat (62) and in a cylindrical shape, and the through holes (63) are sequentially and evenly arranged circumferentially at the lower end of the sealing cylinder (71); the backwashing filter cylinder (45) is penetrated in the sealing cylinder (71), and a sealing assembly (72) is provided between the backwashing filter cylinder (45) and the sealing cylinder (71); an annular sealing body (73) is provided at the upper end of the lifting filter cylinder (43), and one side of the annular sealing body (73) is formed to be connected to the through holes (63) ) corresponding to the annular sealing surface (74), and the lower end of the sealing cylinder (71) is arranged against the annular sealing surface (74) under the action of the elastic pressing component (5); the connecting structure (8) comprises a scraper base (81) formed at the lower end of the rotating scraper cylinder (61), the scraper base (81) having a plurality of openings (82) in the circumferential direction, and the openings (82) are respectively connected to the sewage outlet (31); the sewage discharge component (3) comprises a sewage discharge member (32) rotatably arranged at the lower end of the filter cup body (1) and having a sewage outlet (31), and the upper end of the sewage discharge member (32) is inserted through the lower end of the scraper base (81), and the sewage discharge member (32) and the scraper base (81) are circumferentially positioned and connected;The elastic pressing assembly (5) comprises a pressing spring (51) arranged between the scraper base (81) and the lifting filter cartridge body (43), and one end of the pressing spring (51) acts on the scraper base (81) and the other end acts on the bottom of the lifting filter cartridge body (43). ; 2. The automatic backwash filter according to claim 1, characterized in that: The sealing assembly (72) comprises a sealing ring installation groove (75) arranged on the circumferential outer side of the backwash filter cylinder (45), and a sealing ring body (76) in contact with the circumferential inner wall of the sealing cylinder (71) is arranged in the sealing ring installation groove (75).

3. The automatic backwash filter according to claim 2, characterized in that: The circumferential positioning structure (9) comprises a plurality of positioning convex strips (91) arranged on the circumferential outer side of the scraper barrel mounting seat (62), and a positioning groove (92) corresponding to the positioning convex strips (91) is arranged on the circumferential inner side of the upper end of the filter cup body (1), and the positioning convex strips (91) are inserted into the positioning grooves (92); the lower end of the scraper barrel mounting seat (62) is inserted into the upper end of the rotating scraper barrel body (61), and the scraper barrel mounting seat (62) and the rotating scraper barrel body (61) are connected to each other in a circumferential rotational manner.

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