A backwash pre-filter with a one-way valve

Abstract

This utility model discloses a backwashing pre-filter with a one-way valve, relating to the field of pre-filter technology. It includes a filter bottle and a valve seat, a diverter located at the port of the filter bottle with diverting holes on its bottom surface, a filter support inside the diverter, several filter plates on its outer periphery, retaining rings corresponding to each diverting hole on the side wall of the filter support near the valve seat, a ring platform inside the port of the filter support with several guide holes on its end face, and several cleaning holes connected to the guide holes, a one-way valve inside the port of the ring platform that can only open towards the side closest to the valve seat, and a control valve with an openable and closable drain hole connected to the inner cavity of the filter bottle. The control valve is connected to a piston plate via an elastic element, causing the piston plate to hold the filter plates. This application solves the technical problem of existing pre-filters accumulating debris between filter plates after long-term use, making it difficult to clean the filter plates and leading to filter equipment failure.

Description

Technical Field

[0001] This utility model relates to the field of pre-filter technology, and in particular to a backwashing pre-filter with a one-way valve. Background Technology

[0002] Urban water supply pipelines are old and extensive. Rust, silt, and other impurities in the pipes can cause water-using equipment to malfunction, thus requiring filtration devices. Pre-filters are typically installed after the water meter, primarily to restore tap water to its pre-treatment standard, protecting downstream equipment. Pre-filters have a filtration precision of 5-100 microns, filtering out visible impurities such as silt, rust, and suspended matter, significantly extending the lifespan of subsequent equipment. However, after prolonged use, silt, rust, and other impurities accumulate between the filter elements, reducing the filtration efficiency of the pre-filter. Existing pre-filters generally have low flow rates, relatively complex structures, and high costs. During wastewater discharge, the filter elements are difficult to disperse, leaving many impurities trapped between them, hindering efficient flushing.

[0003] In summary, developing a pre-filter that facilitates rinsing away debris between filter elements and maintains high filtration efficiency is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] The purpose of this invention is to provide a backwashing pre-filter with a one-way valve, which solves the technical problem that existing filter pre-filters are difficult to clean, leading to easy failure of the filtration equipment.

[0005] To achieve the above objectives, this utility model provides a backwashing pre-filter with a one-way valve, comprising:

[0006] The filter bottle has its port connected to a valve seat. The valve seat has a guide plate inside, which is perpendicular to the axis of the valve seat. The guide plate divides the port of the filter bottle into an inlet and an outlet.

[0007] A diverter is located at the port of the filter bottle. The bottom surface of the diverter has several diverting holes that connect the inner cavity of the diverter to the inner cavity of the filter bottle.

[0008] A filter support is slidably disposed within the distributor. Several filter plates are disposed on the outer periphery of the filter support. A retaining ring is disposed on the side wall of the filter support near the valve seat. The retaining ring corresponds to each distributor hole. An annular platform is disposed inside the port of the filter support. Several guide holes are disposed on the end face of the annular platform. Each guide hole extends along the axial direction of the filter support and forms a flushing channel in the side wall of the filter support. Several cleaning holes extend from the flushing channel and are used to flush each filter plate.

[0009] A check valve is located inside the port of the ring platform. The check valve can only be opened to the side closest to the valve seat.

[0010] The control valve has an openable and closable drain hole that is connected to the inner cavity of the filter bottle. The control valve is connected to a piston plate via an elastic element, which holds the filter plate against the filter.

[0011] Preferably, the filter elements are stacked sequentially along the axial direction of the filter support, and the stacked filter elements are spaced apart from the side wall of the filter bottle, with the flow diversion holes corresponding to the gaps between the filter bottle and the filter elements.

[0012] Preferably, the filter support includes a top plate and a bottom plate that are parallel to each other, and a support rod is vertically provided between the top plate and the bottom plate. Each support rod corresponds to each guide hole. The rinsing channel is provided inside the support rod, and each cleaning hole is provided on the side wall of the support rod. The opening direction of each cleaning hole is parallel to each filter element.

[0013] Preferably, the piston plate includes a support plate and a connecting plate, with a support plate vertically provided between the support plate and the connecting plate, and a docking plate extending from the support plate. When the retaining ring docks with the outlet, the support plate supports each filter element. The connecting plate is provided with a connecting hole that communicates with the drain hole.

[0014] Preferably, the base plate is provided with connecting holes, and the bearing plate is connected to a compression plug through each mating plate. The compression plug includes an abutment plate, and the abutment plate is provided with a number of sealing blocks, which can be inserted into the connecting holes.

[0015] Preferably, there are three sealing blocks, which are evenly distributed around the axis of the filter support, so that the sealing blocks are distributed in a Y shape. There are mating holes between the sealing blocks for inserting mating plates.

[0016] Preferably, the bottom plate has a buckle on the side opposite to the piston plate. When the pressing plug abuts against the bottom plate, the mating plate extends into the inner cavity of the filter bracket and engages with the buckle.

[0017] Preferably, the port sidewall of the filter support is provided with a number of mesh holes, and a backwashing net is fitted around the outer periphery of the mesh holes and the port of the filter support. The backwashing net is used to filter the sewage generated by backwashing. A net cover is also snapped into the port of the filter support to fix the backwashing net.

[0018] Preferably, the connecting plate has a snap-fit ​​groove on the side opposite to the bearing plate, and the snap-fit ​​groove is connected to one end of the elastic element.

[0019] Preferably, an isolation sleeve is provided on the inner wall of the valve seat to prevent water from contacting the valve seat.

[0020] Compared to the aforementioned background technology, the backwashing pre-filter with a one-way valve provided by this utility model includes: a filter bottle connected to a valve seat, the inner cavities of which are interconnected; a guide plate is provided at the port where the valve seat and the filter bottle communicate, the guide plate being perpendicular to the axis of the filter bottle and dividing the port of the filter bottle into an inlet and an outlet, the inlet being located on one side of the valve seat inlet end and the outlet being located on one side of the valve seat outlet end; a diverter is provided inside the port of the filter bottle, the bottom surface of the diverter having several diverting holes that connect the inner cavity of the diverter to the inner cavity of the filter bottle; a filter support is provided inside the diverter, and the filter support is located inside the outlet, the filter support being axially sliding within the inner cavity of the filter bottle; and the outer periphery of the filter support is provided with... Several filter elements are provided. A retaining ring is provided on the outer periphery of the filter support near the valve seat. The retaining ring moves with the filter support and can abut against the water outlet to seal the water outlet. An annular platform is provided on the inner side of the port of the filter support. Several guide holes are provided on the end face of the annular platform. Each guide hole extends along the axial direction of the filter support, so that the guide holes form a flushing channel in the side wall of the filter support. Several cleaning holes extend into the inner cavity of the filter support through the flushing channel. The cleaning holes correspond to the filter elements. A one-way valve is provided in the port of the annular platform, which can only be opened on the side closer to the valve seat. A control valve is provided at the bottom of the filter bottle to control the opening and closing of the drain hole. The control valve is connected to a piston plate through an elastic element. The piston plate is used to hold each filter element. When this application performs filtration, the control valve closes the drain hole, and the retaining ring of the filter bracket abuts against the outlet, sealing the outlet. When water enters the inner cavity of the valve seat, the guide plate guides the water to the outlet. The water permeates from the outside of each filter element to the inside of the filter bracket. The water in the inner cavity of the filter bracket presses against the one-way valve, which opens towards the end closest to the valve seat. The filtered water overflows from the inner cavity of the ring platform into the inner cavity of the valve seat. When this application performs backwashing, the control valve opens the drain hole, allowing water to flow out from the drain hole after entering the inner cavity of the filter bottle. The flowing water exerts a certain impact force on the piston plate, causing the piston plate to move the filter bracket downwards. The retaining ring closes the diversion hole, and the water flows into the port of the filter bracket. At this time, the impact of the water on the one-way valve prevents it from opening. The water enters the guide hole of the ring platform and sprays out from the cleaning hole, rinsing the filter elements located on the outside of the filter bracket. After cleaning, the wastewater is discharged from the drain hole.

[0021] This application provides a method to switch between filter cleaning and water filtration by controlling the opening and closing of the drain hole, controlling the flow direction of the water, changing the setting position of the filter support, switching the flow diversion hole to be connected or closed, and limiting the flow direction of the water through a one-way valve, thereby improving the service life of this application. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 A cross-sectional view of a backwashing pre-filter with a one-way valve provided in an embodiment of this utility model;

[0024] Figure 2 This is a first structural diagram of the filter holder provided in an embodiment of the present utility model;

[0025] Figure 3 This is a second structural diagram of the filter holder provided in an embodiment of the present utility model;

[0026] Figure 4 This is a structural diagram of the shunt provided in an embodiment of the present utility model;

[0027] Figure 5 This is a first structural diagram of the piston plate provided in an embodiment of the present utility model;

[0028] Figure 6 This is a second structural diagram of the piston plate provided in an embodiment of the present utility model;

[0029] Figure 7 This is a structural diagram of the compression plug provided in an embodiment of the present utility model.

[0030] Among them, 1-filter bottle; 2-valve seat; 21-guide plate; 3-filter bracket; 31-retaining ring; 32-ring platform; 33-one-way valve; 34-guide hole; 35-connection hole; 36-buckle; 37-cleaning hole; 38-support rod; 4-diverter; 41-diverting hole; 42-clearance hole; 5-filter plate; 6-control valve; 61-drain hole; 7-compression plug; 71-abutment plate; 72-sealing block; 73-connection hole; 8-piston plate; 81-bearing plate; 82-connecting plate; 83-connecting hole; 84-connection plate; 85-clamping groove; 9-elastic element; 10-backwashing screen. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] This application provides a backwash pre-filter with a one-way valve; please refer to the attached instruction manual. Figures 1 to 3 This utility model includes a filter bottle 1, with a valve seat 2 connected to its port. The inner cavities of the two are interconnected. A guide plate 21 is provided in the inner cavity of the valve seat 2, perpendicular to the axis of the filter bottle 1, and dividing the port of the filter bottle 1 into an inlet and an outlet. The inlet is near the inlet end of the valve seat 2, and the outlet is near the outlet end of the valve seat 2. A diverter 4 is provided inside the port of the filter bottle 1, with several diverting holes 41 on the bottom surface of the diverter 4. The diverting holes 41 connect the inner cavity of the diverter 4 with the inner cavity of the filter bottle 1, allowing water to enter the inner cavity of the filter bottle 1 through the diverting holes 41. A filter support 3 is provided inside the diverter 4, located inside the outlet. The filter support 3 can slide axially within the inner cavity of the filter bottle 1. Several filter plates 5 are provided on the outer periphery of the filter support 3, with a filter plate 5 on the outer periphery near the valve seat 2. A retaining ring 31 moves together with the filter support 3. The retaining ring 31 can abut against the water outlet and seal the water outlet. An annular platform 32 is provided on the inner side of the port of the filter support 3. Several guide holes 34 are provided on the end face of the annular platform 32. Each guide hole 34 extends along the axial direction of the filter support 3, so that the guide holes 34 form a flushing channel in the side wall of the filter support 3. Several cleaning holes 37 extend into the inner cavity of the filter support 3. The cleaning holes 37 correspond to the filter plates 5. A one-way valve 33 is provided in the port of the annular platform 32, which can only be opened to the side closer to the valve seat 2. A control valve 6 is provided at the bottom of the filter bottle 1 to control the opening and closing of the drain hole 61. The control valve 6 is connected to a piston plate 8 through an elastic element 9. The piston plate 8 is used to support each filter plate 5 and the filter support 3, so that the retaining ring 31 of the filter support 3 abuts against the water outlet.

[0034] When this utility model is performing filtration, the operator keeps the drain hole 61 of the control valve 6 closed. At this time, the outlet of the inner cavity of the filter bottle 1 is only the water outlet. When the water flows through the inner cavity of the valve seat 2, the water comes into contact with the guide plate 21 and is guided to the inlet. At this time, the elastic element 9 holds the filter bracket 3 through the piston plate 8, so that the retaining ring 31 on the outer periphery of the filter bracket 3 comes into contact with the outlet. The water enters the distributor 4 from the inlet and continues to flow, entering the inner cavity of the filter bottle 1 through the distributor hole 41. It should be noted that... After the baffle ring 31 comes into contact with the outlet, the water cannot flow directly out of the outlet. Instead, the water is forced to pass through the gaps between the filter plates 5. As the water gradually fills the filter bottle 1, it passes through the gaps between the filter plates 5. During this process, the filter plates 5 adsorb dust, rust, and other impurities in the water. After the water fills the inner cavity of the filter support 3, it generates an upward impact force. The water pushes up the one-way valve 33 in the ring platform 32, and the one-way valve 33 opens. The water flows from the outlet into the inner cavity of the valve seat 2, completing the water filtration process.

[0035] When the filter element 5 needs to be backwashed, the operator opens the drain hole 61 of the control valve 6. At this time, the outlet of the inner cavity of the filter bottle 1 is the drain hole 61. The water is guided by the guide plate 21 and enters the distributor 4 from the inlet. The water continues to flow and enters the inner cavity of the filter bottle 1 from the distributor hole 41. Subsequently, some water flows to the outside from the drain hole 61. Since the piston plate 8 supporting the filter support 3 is close to the drain hole 61, the water enters the drain hole 61 and also exerts a certain impact force on the piston plate 8. The water causes the piston plate 8 to move away from the valve seat 2. Correspondingly, each filter element 5 loses its position. With the piston plate 8 removed from its support, the filter plates 5 become loose, and the filter support 3 connected to the piston plate 8 moves down together. The moved retaining ring 31 abuts against the diversion hole 41. At this time, the water enters the diverter 4 but cannot enter the inner cavity of the filter bottle 1 through the diversion hole 41. The water flows to the port of the filter support 3. Since the one-way valve 33 cannot open to the side away from the valve seat 2, the water can only enter the guide holes 34. Then the water sprays out from the cleaning hole 37 to rinse the filter plates 5 on the outside of the filter support 3. After that, the cleaned wastewater is discharged from the drain hole 61, completing the backwashing operation of the pre-filter.

[0036] Please refer to the instruction manual appendix. Figure 4The diverter 4 is specifically a trough. The edge of the port of the diverter 4 extends in a direction away from its axis to form a bearing ring. After the diverter 4 is placed in the filter support 3, the bearing ring abuts against the port of the diverter 4. It should be noted that the outer periphery of the filter support 3 is provided with several filter plates 5, and each filter plate 5 is stacked sequentially along the axis of the filter support 3. The stacked filter plates 5 are spaced apart from the inner wall of the filter bottle 1. The diverter hole 41 corresponds to the gap between the filter plate 5 and the inner wall of the filter bottle 1. The diverter 4 with this structure ensures that the water entering from the inlet first flows to the outside of the filter plate 5. The water needs to pass through the filter plate 5 to enter the inner cavity of the filter support 3 and then flow out from the opening of the one-way valve 33.

[0037] In addition, the filter support 3 includes a top plate and a bottom plate that are parallel to each other. A support rod 38 is provided between the top plate and the bottom plate. Each support rod 38 corresponds to a guide hole 34. That is, the flushing channel formed by the extension of the guide hole 34 is provided inside the support rod 38. Several cleaning holes 37 are provided on the side wall of each support rod 38. The port of each cleaning hole 37 is parallel to each filter element 5. When the cleaning hole 37 sprays water to clean the filter element 5, the water impacts the filter element 5 in a circumferential direction. In the backwashing state, the piston plate 8 releases the support of the filter element 5. The filter elements 5 are relatively loosely distributed. Under the flushing of the water, each filter element 5 rotates. The filter elements 5 remove the accumulated impurities through friction, which improves the backwashing effect. In addition, the support rods 38 are spaced apart to provide a sufficiently large inlet for water to enter the filter support 3.

[0038] Preferably, the control valve 6 is located below the filter bottle 1, and the upper end of the control valve 6 is connected to the piston plate 8 through the elastic element 9. The piston plate 8 can move axially within the filter bottle 1. Furthermore, a clamping plug 7 is connected to the end face of the piston plate 8 near the valve seat 2. Correspondingly, a number of connecting holes 35 are provided on the bottom plate of the filter support 3. When the elastic element 9 holds the piston plate 8, the piston plate 8 drives the clamping plug 7 to move upward, and the clamping plug 7 is engaged with the connecting hole 35. In addition, an annular platform 32 is provided on the top plate, and the inner cavity of the annular platform 32 is connected to the inner cavity of the filter support 3.

[0039] See the instruction manual appendix Figure 5 To be continued Figure 7The compression plug 7 includes a circular abutment plate 71 and several sealing blocks 72 disposed on the abutment plate 71. Preferably, there are three sealing blocks 72, and the included angle between each sealing block 72 is 120°, so that the sealing blocks 72 are distributed in a Y-shape. Similarly, the connecting holes 35 that engage with each sealing block 72 are Y-shaped. When the sealing block 72 and the connecting hole 35 are engaged, the filter bracket 3 and the compression plug 7 are locked in position. Further, the piston plate 8 includes a bearing plate 81 and a connecting plate 82 that are parallel to each other. Several support plates are vertically connected between the bearing plate 81 and the connecting plate 82. The bearing plate 81 is used to support each filter element 5. A connecting hole 83 is provided at the center of the connecting plate 82. The connecting hole 83 is connected to the drain hole 61. A snap-fit ​​groove 85 is provided on the side end face of the connecting plate 82 away from the bearing plate 81. The snap-fit ​​groove 85 engages with one of the elastic elements 9. The end connection allows the elastic element 9 to apply a stable thrust to the piston plate 8. Three docking plates 84 extend from the end face of the bearing plate 81 away from the connecting plate 82. Correspondingly, docking holes 73 corresponding to the positions of each docking plate 84 are provided on the abutment plate 71 and the bottom plate of the filter bracket 3. Each docking hole 73 is located between adjacent sealing blocks 72. When the elastic element 9 holds the piston plate 8, each docking plate 84 passes through the docking holes 73 of the abutment plate 71 and the bottom plate of the filter bracket 3 in sequence. Furthermore, several buckles 36 are provided on the end of the bottom plate of the filter bracket 3 away from the piston plate 8. Each buckle 36 corresponds to each docking hole 73. After the piston plate 8, the pressure plug 7 and the filter bracket 3 are engaged, the docking plates 84 extend into the inner cavity of the filter bracket 3 and engage with each buckle 36, completing the axial locking between the piston plate 8, the pressure plug 7 and the filter bracket 3.

[0040] Please refer to the instruction manual appendix. Figure 1 A sealing gasket is fitted around the outer periphery of the retaining ring 31 to ensure that the upper and lower end faces of the retaining ring 31 abut against the water inlet and the diversion hole 41, completely sealing the water inlet and the diversion hole 41. An annular groove is provided on the side wall of the filter bracket 3 near the valve seat 2. The annular groove is used to set the first sealing ring. The annular groove corresponds to the side wall of the relief hole 42 of the diverter 4. During the sliding process of the filter bracket 3, the first sealing ring is always in contact with the side wall of the relief hole 42, preventing water from entering the diverter 4 and overflowing from the gap between the relief hole 42 and the filter bracket 3 into the inner cavity of the filter bracket 3. Unfiltered water is discharged from the port of the filter bracket 3, thereby reducing the filtration effect of this application.

[0041] Furthermore, the filter bottle 1 is threadedly connected to the valve seat 2. A boss extends outward from the threaded section of the filter bottle 1 away from the valve seat 2, and a sealing ring is provided on the boss. When the valve seat 2 and the filter bottle 1 are screwed together, the end of the valve seat 2 and the boss tightly clamp the sealing ring, ensuring that this application has sufficient sealing performance. Furthermore, several mesh holes are provided on the side wall of the port of the filter support 3. The mesh holes allow water to flow into the inner cavity of the filter support 3. A backwashing net 10 is fitted around the outer periphery of the mesh holes and at the port of the filter support 3. In actual use, the water entering the port of the filter support 3 is difficult to completely enter each guide hole 34. Some water is guided by the side wall of the inner cavity of the filter support 3 and flows to the port of the filter support 3. The backwashing net 10 is used to filter the sewage generated by backwashing. A net cover is also snapped at the port of the filter support 3 to fix the backwashing net 10.

[0042] Since the valve seat 2 is made of metal, and some valve seats 2 contain heavy metals such as lead, an isolation sleeve is provided on the inner wall of the valve seat 2 to prevent water from contacting the valve seat 2.

[0043] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0044] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. A backwash pre-filter with a one-way valve, characterized in that, include: A filter bottle (1) has its port connected to a valve seat (2). The valve seat (2) has a guide plate (21) in its inner cavity. The guide plate (21) is perpendicular to the axis of the valve seat (2). The guide plate (21) divides the port of the filter bottle (1) into an inlet and an outlet. A diverter (4) is provided at the port of the filter bottle (1). The bottom surface of the diverter (4) is provided with a plurality of diverting holes (41), which connect the inner cavity of the diverter (4) with the inner cavity of the filter bottle (1). A filter support (3) is slidably disposed within the diverter (4). A plurality of filter plates (5) are provided on the outer periphery of the filter support (3). A retaining ring (31) is provided on the side wall of the filter support (3) near the valve seat (2). The retaining ring (31) corresponds to each of the diverting holes (41). A ring platform (32) is provided in the port of the filter support (3). A plurality of guide holes (34) are provided on the end face of the ring platform (32). Each guide hole (34) extends along the axial direction of the filter support (3) and forms a flushing channel in the side wall of the filter support (3). The flushing channel extends with a plurality of cleaning holes (37). Each cleaning hole (37) is used to flush each of the filter plates (5). A one-way valve (33) is located in the port of the ring platform (32), and the one-way valve (33) can only be opened to the side closer to the valve seat (2); The control valve (6) is provided with a drain hole (61) that can be opened and closed. The drain hole (61) is connected to the inner cavity of the filter bottle (1). The control valve (6) is connected to a piston plate (8) through an elastic element (9), so that the piston plate (8) holds the filter sheet (5).

2. The backwash pre-filter with a one-way valve according to claim 1, characterized in that, Each of the filter elements (5) is stacked sequentially along the axial direction of the filter support (3). The stacked filter elements (5) are spaced apart from the side wall of the filter bottle (1). The flow diversion hole (41) corresponds to the gap between the filter bottle (1) and the filter elements (5).

3. The backwash pre-filter with a one-way valve according to claim 2, characterized in that, The filter support (3) includes a top plate and a bottom plate that are parallel to each other. A support rod (38) is provided vertically between the top plate and the bottom plate. Each support rod (38) corresponds to each of the guide holes (34). The flushing channel is located inside the support rod (38). Each cleaning hole (37) is located on the side wall of the support rod (38). The opening direction of each cleaning hole (37) is parallel to each of the filter plates (5).

4. The backwash pre-filter with a one-way valve according to claim 3, characterized in that, The piston plate (8) includes a support plate (81) and a connecting plate (82). A support plate is vertically provided between the support plate (81) and the connecting plate (82). A docking plate (84) extends from the support plate (81). When the retaining ring (31) docks with the outlet, the support plate (81) supports each of the filter sheets (5). The connecting plate (82) is provided with a connecting hole (83), which communicates with the drain hole (61).

5. The backwash pre-filter with a one-way valve according to claim 4, characterized in that, The top plate supports the ring platform (32), the bottom plate is provided with a connecting hole (35), the support plate (81) is connected to a compression plug (7) through each of the docking plates (84), the compression plug (7) includes an abutment plate (71), the abutment plate (71) is provided with a plurality of sealing blocks (72), the sealing blocks (72) can be inserted into the connecting hole (35).

6. The backwash pre-filter with a one-way valve according to claim 5, characterized in that, Specifically, there are three sealing blocks (72), and each sealing block (72) is evenly distributed around the axis of the filter bracket (3) so that each sealing block (72) is distributed in a Y shape. Each sealing block (72) is provided with a docking hole (73), and the docking hole (73) is used to pass through the docking plate (84).

7. The backwash pre-filter with a one-way valve according to claim 5, characterized in that, The bottom plate is provided with a buckle (36) on the side opposite to the piston plate (8). When the pressing plug (7) abuts against the bottom plate, the docking plate (84) extends into the inner cavity of the filter bracket (3) and engages with the buckle (36).

8. The backwash pre-filter with a one-way valve according to claim 1, characterized in that, The filter support (3) has several mesh holes on its port sidewall. A backwashing net (10) is fitted around the outer periphery of the mesh holes and at the port of the filter support (3). The backwashing net (10) is used to filter the sewage generated by backwashing. A net cover is also snapped into the port of the filter support (3). The net cover is used to fix the backwashing net (10).

9. The backwash pre-filter with a one-way valve according to claim 4, characterized in that, The connecting plate (82) has a snap-fit ​​groove (85) on the side opposite to the bearing plate (81), and the snap-fit ​​groove (85) is connected to one end of the elastic member (9).

10. The backwash pre-filter with a one-way valve according to claim 1, characterized in that, The valve seat (2) is provided with an isolation sleeve on its inner wall, which is used to prevent water from contacting the valve seat (2).

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