CN111450592A

CN111450592A - Front filter

Info

Publication number: CN111450592A
Application number: CN202010283238.5A
Authority: CN
Inventors: 苏杰; 林细勇; 秦燕芝; 蒋玉林; 赖化明; 谢承志
Original assignee: Foshan Rifeng Enterprise Co Ltd; Rifeng Enterprise Group Co Ltd; Rifeng Technology Co Ltd
Current assignee: Foshan Rifeng Enterprise Co Ltd; Rifeng Enterprise Group Co Ltd; Rifeng Technology Co Ltd
Priority date: 2020-04-10
Filing date: 2020-04-10
Publication date: 2020-07-28

Abstract

The invention relates to the technical field of filters, and discloses a pre-filter which comprises a valve body, a shell, a valve core assembly and a blow-down valve, wherein the valve body is arranged at the top end of the shell, the valve core assembly and the blow-down valve are both arranged in the shell, the valve body is provided with a water inlet end, a water outlet end and a filter cavity respectively communicated with the water inlet end and the water outlet end, the top side of the inner wall of the filter cavity extends downwards to form a baffle, and the valve core assembly comprises an inner framework, an impeller, a lower filter screen, a spray gun, a piston body and an elastic part. When the pre-filter provided by the invention is used, the problem that large-particle dirt and residue are difficult to wash out can be solved only by simple sewage discharge operation, and the operation is convenient and quick.

Description

Front filter

Technical Field

The invention relates to the technical field of filters, in particular to a pre-filter.

Background

The pre-filter is the first coarse filter for water used in whole house, and can filter silt, rust, algae and other large particle impurity from tap water.

At present, most backwash pre-filter on the market can have dirty accumulation to block up the clearance after using a period of time, this is because: the back washing filter screen is arranged in the upper end of the filter element, when the filter element moves up and down in the working process, impurities in raw water firstly enter the filter element along with the raw water and then flow into the filter screen, the impurities can be trapped in a gap between the filter screen and the inner wall of the filter element, and the situation that the normal work of the back washing function is influenced due to the accumulation of dirt in the past for a long time is caused. Moreover, the existing pre-filter has poor backwashing decontamination effect, and the bottom inside the pre-filter is often accumulated with dirt, so that the filter screen is easily blocked, and the filtering work is influenced.

Disclosure of Invention

The purpose of the invention is: the utility model provides a leading filter, it only needs simple blowdown operation can solve the dirty attached problem of remaining being difficult to the sanitization of large granule, and convenient operation is swift.

In order to achieve the above object, the present invention provides a prefilter comprising a valve body, a housing, a valve core assembly and a blowoff valve, wherein the valve body is mounted at the top end of the housing, the blowoff valve is mounted in the housing,

the valve body is provided with a water inlet end, a water outlet end and a filter cavity respectively communicated with the water inlet end and the water outlet end, the top side of the inner wall of the filter cavity extends downwards to form a baffle plate,

the valve core component comprises an inner framework, an impeller, a lower filter screen, a spray gun, a piston body and an elastic part, wherein the inner framework is arranged in the shell, the top side of the inner framework is provided with a water inlet, the side surface of the inner framework is provided with a water through hole, the impeller is positioned below the water inlet and is rotatably sleeved outside the inner framework, the lower filter screen is sleeved outside the inner framework, a containing cavity is formed between the lower filter screen and the shell and is communicated with the water inlet, the spray gun is vertically arranged in the inner framework, the outer side of the upper part of the spray gun is sleeved with the upper filter screen, the top side of the upper filter screen is connected with the bottom side of the baffle, a water purifying cavity vertically penetrates through the spray gun and is respectively communicated with the filtering cavity and the containing cavity, the spray gun is provided with an extending part along the radial direction of the spray gun, and the spray gun can move up and down in the inner, when the spray gun moves upwards, the top side of the spray gun is abutted against the baffle, the water inlet end is communicated with the water inlet hole, when the spray gun moves downwards, the extending part covers the upper part of the water inlet hole,

the piston body is arranged at the bottom side of the spray gun, a lower cavity is formed among the piston body, the shell and the blow-down valve, the bottom of the lower cavity is communicated with a water inlet of the blow-down valve, a blow-down through hole is formed in the piston body and is respectively communicated with the containing cavity and the lower cavity, the elastic piece is arranged in the lower cavity, the top side of the elastic piece is connected with the piston body, and the bottom side of the elastic piece is connected with the top side of the blow-down valve.

As a preferred scheme, the upper filter screen is sleeved on the upper part of the spray gun through a backwashing framework, the upper filter screen is fixedly sleeved on the outer side of the backwashing framework, the backwashing framework is sleeved on the upper part of the spray gun, a channel for the spray gun to move up and down is vertically arranged in the backwashing framework, the top side of the backwashing framework is connected with the bottom side of the baffle, the backwashing framework is arranged on the top side of the inner framework, a space for the extension part of the spray gun to move up and down is formed by the bottom side of the backwashing framework and the top side of the inner framework, and a plurality of cleaning through holes are formed in the side surface of the backwashing framework.

Preferably, the impeller comprises an annular sleeve body, the sleeve body is sleeved on the outer side of the inner framework, at least two obliquely arranged fins are arranged on the outer side of the sleeve body, and an oblique water channel is formed between every two adjacent fins.

As a preferred scheme, the inner frame includes the water portion of crossing, the shape of water portion of crossing is the tube-shape, it sets up to cross the water through-hole the side of water portion of crossing, the cup joint body cup joints outside the water portion of crossing, the top side of crossing the water portion has water inlet portion along radially extending, the top side of water inlet portion is into water terminal surface, the inlet opening sets up on the terminal surface of intaking.

As the preferred scheme, the water passing part is extended with a clamping platform along the radial direction, the clamping platform surrounds the lower part of the water inlet part,

at least two clamping sheets are protruded from the inner side of the sleeving body, and the bottom sides of the clamping sheets are abutted to the top side of the clamping platform.

Preferably, the valve element assembly further comprises a water sprayer, the water sprayer is located in the inner framework and rotatably sleeved on the periphery of the spray gun, the bottom side of the water sprayer abuts against the top side of the piston body, a plurality of water spray holes are formed in the side face of the water sprayer, the water spray holes are communicated with the filter holes of the lower filter screen and the purified water cavity, and the total area of the water spray holes is smaller than the cross section area of the top end of the purified water cavity.

Preferably, a water flowing channel is arranged at the upper part of the water sprayer and is respectively communicated with the water purifying cavity and the filtering holes.

As a preferable scheme, the sewage treatment device further comprises an outer framework, the outer framework is arranged in the shell, the inner framework and the piston body are both arranged in the outer framework, the bottom of the outer framework is connected with the top side of the sewage discharge valve, the outer framework divides the accommodating cavity into an upper cavity and an outer cavity, the upper cavity is formed between the outer framework and the inner framework, the outer cavity is formed between the outer framework and the shell, the upper cavity is respectively communicated with the water inlet hole and the filter hole, and the sewage discharge through hole is communicated with the upper cavity and the lower cavity.

Preferably, the outer frame is connected with the blowoff valve through a connecting piece, the top side of the connecting piece is connected with the outer frame, the bottom side of the connecting piece is connected with the top side of the blowoff valve, the bottom side of the elastic piece is abutted against the top side of the connecting piece, the piston body, the outer frame and the connecting piece form the lower cavity, a water through hole vertically penetrates through the connecting piece, and the water through hole is communicated with the lower cavity and a water inlet of the blowoff valve.

Preferably, the filter comprises a filter bottle, the filter bottle is detachably mounted in the shell, the filter bottle is detachably connected with the valve body, and the outer framework is mounted in the filter bottle.

As the preferred scheme, be connected with two at least scraping and washing pieces on the exoskeleton, the outside of scraping and washing piece with the inner wall laminating of filter flask, the inboard of scraping and washing piece with the outside laminating of lower filter screen.

Preferably, the outer side of the scraping and washing piece is provided with an outer scraping and washing strip which is obliquely arranged, the outer scraping and washing strip is attached to the filter flask, the oblique direction of the outer scraping and washing strip is the same as that of the fins,

the inner side of the scraping and washing piece is provided with an inner scraping and washing strip which is obliquely arranged, and the inner scraping and washing strip is attached to the lower filter screen.

Preferably, the shell comprises an upper shell and a lower shell detachably connected with the upper shell, the outer framework is installed in the upper shell, and the blowoff valve and the connecting piece are fixedly installed in the lower shell.

Preferably, the upper housing comprises a front cover and a rear cover, and the front cover and the rear cover are detachably connected.

Preferably, a protective shell is arranged outside the valve body and connected with the top side of the shell.

As a preferred scheme, a pressure gauge is installed in the protective shell, a protective lens is installed on the protective shell, and the protective lens corresponds to the pressure gauge.

Preferably, the protective shell is provided with a memory knob, the memory knob comprises a recording disk and a rotary disk, the recording disk is connected to the top side of the protective shell, and the rotary disk is rotatably connected to the recording disk.

As a preferred scheme, a pressure stabilizing regulating valve is arranged on the valve body.

Preferably, the sewage draining device further comprises a sewage draining knob, wherein the sewage draining knob is connected with the sewage draining valve, and the sewage draining knob is rotatably connected outside the shell.

Preferably, the sewage draining device further comprises a controller and a power supply, wherein the controller and the power supply are both arranged on the outer side of the shell, the power supply is electrically connected with the controller, and the controller is electrically connected with the sewage draining valve.

Compared with the prior art, the pre-filter provided by the embodiment of the invention has the beneficial effects that:

1. the upper filter screen is arranged outside the spray gun, when the spray gun is back flushed, the upper end of the spray gun and the upper filter screen are exposed out of the filter cavity, raw water is filtered by the upper filter screen and then enters the interior of the spray gun for back flushing operation, and because the spray gun moves in the interior of the upper filter screen, dirt cannot enter between the upper filter screen and the spray gun to influence the normal operation of back flushing, so that a back flushing structure can be protected from long-term and effective operation;

2. the impeller is rotatably sleeved on the inner framework, raw water enters the accommodating cavity from the water inlet and impacts the impeller to rotate the impeller, and meanwhile, the raw water is accelerated and can rapidly enter the accommodating cavity to impact impurities in the accommodating cavity, so that the phenomenon that dirt is attached to the accommodating cavity for a long time to cause the blockage of the lower filter screen can be avoided, and the service life of the filter can be prolonged;

3. when the blowoff valve is opened, the pressure difference formed between the water inlet end and the drain outlet makes the pressure in the filter different, and the elastic element is arranged to change the upper and lower positions of the spray gun in the filter cavity, so that the valve core assembly moves along the axial direction, the spray gun moves down along the axis, the extension part of the spray gun seals the water inlet hole of the inner framework, a back washing water passage is formed between the spray gun and the lower filter screen, the change of the water flow passage is realized, and the better filtering and back washing effects are achieved.

Drawings

FIG. 1 is a front view of a pre-filter according to a first embodiment of the present invention in a filtered state;

FIG. 2 is a cross-sectional view of a pre-filter in a filtration state according to a first embodiment of the present invention;

FIG. 3 is a front view of a pre-filter according to a first embodiment of the present invention in a backflushed state;

FIG. 4 is a cross-sectional view of a pre-filter in a backwash state according to a first embodiment of the present invention;

FIG. 5 is an exploded view of a pre-filter according to a first embodiment of the present invention;

FIG. 6 is a perspective view of a valve body according to a first embodiment of the present invention;

FIG. 7 is a cross-sectional view of a valve body according to a first embodiment of the present invention;

FIG. 8 is a perspective view of the valve cartridge assembly (with the water jet removed) according to a first embodiment of the present invention;

FIG. 9 is a cross-sectional view of an inner skeleton according to a first embodiment of the invention;

FIG. 10 is a perspective view of an impeller according to a first embodiment of the present invention;

FIG. 11 is a perspective view of a lower filter according to a first embodiment of the present invention;

FIG. 12 is a perspective view of a spray gun according to a first embodiment of the present invention;

fig. 13 is a perspective view of a piston body according to a first embodiment of the present invention;

FIG. 14 is a perspective view of a sprinkler according to a first embodiment of the present invention;

FIG. 15 is a schematic view of the connection of the exoskeleton, the filter flask, the connector, the valve body and the housing according to the first embodiment of the invention;

FIG. 16 is an exploded view of the filter cartridge, connector, lower housing, valve body and housing of the first embodiment of the present invention;

FIG. 17 is an exploded view of a filter cartridge, connector, valve body and housing in accordance with an embodiment of the present invention;

FIG. 18 is a perspective view of an exoskeleton according to a first embodiment of the invention;

FIG. 19 is a perspective view of a lower housing of a first embodiment of the present invention;

FIG. 20 is a perspective view of the lower housing of the first embodiment of the present invention;

FIG. 21 is a perspective view of a backwash framework according to the first embodiment of the invention;

FIG. 22 is a perspective view of a scraper in accordance with a first embodiment of the invention

FIG. 23 is a perspective view of a pressure gauge in accordance with a first embodiment of the present invention;

FIG. 24 is a schematic view of the connection between the memory knob and the housing according to the first embodiment of the present invention;

FIG. 25 is a top view of the memory knob;

FIG. 26 is an enlarged view at A in FIG. 25;

FIG. 27 is a perspective view of a turntable according to a first embodiment of the present invention;

FIG. 28 is a perspective view of a Y-gasket in accordance with a first embodiment of the present invention;

FIG. 29 is a perspective view of a pre-filter to which a regulator valve according to a first embodiment of the present invention is attached;

FIG. 30 is a perspective view of a universal prefilter of a second embodiment of the present invention;

FIG. 31 is a perspective view of a prefilter of a second embodiment of the present invention;

fig. 32 is a perspective view of a prefilter of a third embodiment of the present invention.

In the figure, 1, a valve body; 1a, a water inlet end; 1b, a water outlet end; 1c, a filter cavity; 1d, a water measuring end of a pressure gauge; 2. a blowoff valve; 3. a baffle plate; 4. a lower cavity; 5. a water outlet; 6. steel rings; 7. an accommodating chamber; 71. an upper cavity; 72. an outer cavity; 8. a valve core assembly; 81. an inner skeleton; 811. a water passing part; 812. a water inlet part; 812a water inlet end surface; 82. an impeller; 821. a socket body; 822. a fin; 83. a lower filter screen; 83a, a filter hole; 84. a spray gun; 85. a piston body; 86. an elastic member; 87. a water sprayer; 9. memorizing a knob; 91. a recording disk; 92. a turntable; 10. a connecting member; 101. an outer connecting member; 102. an inner connecting member; 11. a housing; 111. an upper housing; 1111. a front cover body; 1112. a rear cover body; 112. a lower housing; 12. a filter screen is arranged; 13. a water purifying cavity; 14. an extension portion; 15. a sewage discharge through hole; 16. backwashing the framework; 17. a channel; 18. clamping the platform; 19. a clip sheet; 20. a water spray hole; 21. a water flow channel; 22. an outer skeleton; 23. a water through hole; 24. a filter flask; 25. a scraping and washing member; 26. scraping and washing the strips; 27. inner scraping and washing strips; 28. a protective shell; 29. a pressure gauge; 30. protecting the lens; 31. a pressure stabilizing regulating valve; 32. an AC plug; 33. a controller; 34. a power source; 35. a recoil seal ring; 36. connecting a sealing ring; 37. a first seal ring; 38. a second seal ring; 39. a universal adapter; 40. a convex tooth; 41. an arc-shaped groove; 42. a handle; 43. a convex portion; 44. a clamp spring; 45. a special spanner; 46. a pollution discharge knob; 47. elastic buckle; 48. a magnet; 49. cleaning the through hole; 50. a Y-shaped gasket; 51. a water passing through hole; 52. sealing the cover; 53. blind holes; 54. a fastener; 55. a lower cover body; 56. a protrusion; 57. a cartridge hole; 58. a card; 59. sealing the inclined plane; 60. installing an inclined plane; 61. a water inlet hole; 62. a positioning projection; 63. and (6) positioning a groove.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the present invention, it should be understood that the terms used in the present invention are used in the description of the present invention, and it should be understood that the directions or positional relationships indicated by the terms "center", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. used in the present invention are based on the directions or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention.

It should be understood that the terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, which are only used to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example one

As shown in fig. 1 to 29, a prefilter according to a preferred embodiment of the present invention includes a valve body 1, a housing 11, a spool assembly 8, and a waste valve 2.

The valve body 1 is arranged at the top end of the shell 11, and the valve core assembly 8 and the blow-down valve 2 are sequentially arranged in the shell 11 from top to bottom. One end of the valve body 1 is provided with a water inlet end 1a, and the other end of the valve body 1 is provided with a water outlet end 1b, namely, the water inlet end 1a and the water outlet end 1b are oppositely arranged and are positioned on the same horizontal line. In other embodiments, the water inlet and outlet ends 1a and 1b may not be in the same horizontal line, or the water inlet and outlet ends 1a may be disposed obliquely, which is not limited to this example. The ends of the water inlet end 1a and the water outlet end 1b can be provided with mounting positions for connecting pipelines. The valve body 1 is provided with a filter cavity 1c, and two ends of the filter cavity 1c are respectively communicated with the water inlet end 1a and the water outlet end 1 b. The baffle 3 extends downwards from the top side of the inner wall of the filter cavity 1c, and the baffle 3 is vertically arranged on one side close to the water inlet end 1 a.

The drain outlet of the drain valve 2 is connected with a floor drain, and the drain valve 2 can be a drain ball valve. The lower end of the blowoff valve 2 is in threaded connection with a fastening piece 54, and the fastening piece 54 can be connected with an external rubber pipe through a blowoff pipe quick plug assembly, so that impurities discharged from the blowoff valve 2 are discharged into a sewer.

The valve core assembly 8 corresponds to a filter element of a conventional filter device. The valve core assembly 8 comprises an inner frame 81, an impeller 82, a lower filter screen 83, a spray gun 84, a piston body 85 and an elastic piece 86.

Inner frame 81 is fixedly mounted in housing 11, as shown in fig. 9, the top side of inner frame 81 is provided with water inlet holes 61, the number of water inlet holes 61 in this embodiment is four, and four water inlet holes 61 are equidistantly spaced around the central axis of inner frame 81. The outer peripheral side of the inner frame 81 is provided with a water passing through hole 51. In this embodiment, the number of the water passing holes 51 is several, and the several water passing holes 51 are uniformly distributed on the periphery of the inner frame 81.

Impeller 82 sets up in the below of inlet opening 61 and rotationally the suit outside inner frame 81, and impeller 82 can be around inner frame 81360 rotations.

As shown in fig. 11, the lower filter screen 83 is a hollow cylindrical structure, and the steel rings 6 are arranged at the upper end and the lower end of the lower filter screen, so that the strength of the whole lower filter screen 83 can be increased, the lower filter screen 83 can be conveniently disassembled, and repeated disassembly and assembly can be realized. The lower filter screen 83 has a plurality of filter holes 83a formed in the outer periphery thereof, the shape of the filter holes 83a is not limited, and the size of the filter holes 83a is set according to the size of the impurities to be filtered. Lower filter screen 83 cup joints and hugs closely in inner frame 81 periphery, forms between lower filter screen 83 and the casing 11 and holds chamber 7, holds chamber 7 and communicates with the filtration hole 83a in inlet opening 61 and the lower filter screen 83 respectively.

The lance 84 is vertically installed within the inner frame 81 and can move up and down in the inner frame 81. As shown in fig. 12, the lance 84 has a structure with a large upper part and a small lower part, and the lance 84 can be divided into an upper part, a middle part and a lower part. The upper part and the lower part of the spray gun 84 are both cylindrical, the outer diameter of the upper part of the spray gun 84 is larger than the outer diameter of the lower part, the middle part of the spray gun 84 is of a transition structure which is in transition from the upper part with large outer diameter to the lower part with small outer diameter, and the longitudinal section of the middle part of the spray gun 84 is in an isosceles trapezoid shape. The upper part of the lance 84 is provided with an extension part 14 along the radial direction, and the extension part 14 is an annular sheet structure which protrudes from the outer surface of the lance 84 and is horizontally arranged. The upper part of the spray gun 84 is sleeved with the upper filter screen 12, the upper filter screen 12 is arranged above the extension part 14, the upper part of the upper filter screen 12 is connected with the bottom side of the baffle 3, and the spray gun 84 can move up and down in the inner framework 81 and the upper filter screen 12. The spray gun 84 vertically penetrates through the water purifying cavity 13, and the upper end of the water purifying cavity 13 is communicated with the filter cavity 1 c. The clean water chamber 13 can be divided into upper and lower parts, the upper part of the clean water chamber 13 corresponds to the part from the top side of the spray gun 84 to the extension part 14, and the lower part of the clean water chamber 13 corresponds to the part from the extension part 14 to the bottom end of the spray gun 84. The upper portion of the clean water chamber 13 has an inner diameter larger than that of the lower portion thereof. The water purifying cavity 13 is a stepped circular hole. The side surface of the lower part of the spray gun 84 is provided with a plurality of water outlets 5, the water outlets 5 are uniformly distributed on the periphery of the lower part of the spray gun 84, and the water outlets 5 are respectively communicated with the filter holes 83a and the water purifying cavity 13. When the spray gun 84 moves upwards, the upper part of the spray gun 84 is positioned in the filter cavity 1c, specifically, the part from the top side of the spray gun 84 to the extension part 14 is positioned in the filter cavity 1c, the water flow from the water inlet end 1a to the filter cavity 1c in the valve body 1 is blocked, at this time, the top side of the spray gun 84 is abutted against the bottom side of the baffle plate 3, the water inlet end 1a is communicated with the water inlet hole 61, and the purified water cavity 13 is communicated with the water outlet end 1b through the filter cavity 1 c. When the lance 84 is moved down, the extension 14 covers over the inlet opening 61, preventing water from flowing from the inlet end 1a into the inlet opening 61. At this time, the upper portion of the lance 84 is located at the lower side of the filter chamber 1 c.

As shown in fig. 13, the piston body 85 includes three parts of an upper part, a middle part and a lower part, the upper part, the middle part and the lower part of the piston body 85 are all cylindrical in shape, the middle part of the piston body 85 has an outer diameter larger than the upper part of the piston body 85 and smaller than the lower part of the piston body 85, and the piston body 85 has a stepped structure. As shown in fig. 2, the piston body 85 is provided at an upper portion thereof with an internal thread, the spray gun 84 is provided at a bottom thereof with an external thread threadedly engaged with the internal thread, and the piston body 85 is threadedly mounted at a bottom side of the spray gun 84. The middle and lower portions of the piston body 85 are provided with cylindrical blind holes 53. A lower cavity 4 is formed among the piston body 85, the shell 11 and the blow-down valve 2, and the bottom of the lower cavity 4 is communicated with the water inlet of the blow-down valve 2. And a sewage discharge through hole 15 is formed in the bottom side of the middle part of the piston body 85, and the sewage discharge through hole 15 is respectively communicated with the accommodating cavity 7 and the lower die cavity 4. The blind hole 53 of the piston body 85 is provided with a guide post, and the guide post is sleeved with an elastic piece 86.

The elastic piece 86 is vertically arranged in the lower cavity 4, the elastic piece 86 is connected with the piston body 85, the top side of the elastic piece 86 abuts against the upper side of the inner wall of the blind hole 53, and the bottom side of the elastic piece 86 is connected with the top side of the blow-off valve 2. In this embodiment, the elastic member 86 is a tower spring.

In the non-working state, the blowoff valve 2 is closed, the elastic force of the elastic member 86 is larger than the gravity of the spray gun 84 and the piston body 85, the elastic member 86 is in the extending state, the spray gun 84 and the piston body 85 are moved upwards by the upward elastic force of the elastic member 86, the upper part of the spray gun 84 is positioned in the filter chamber 1c of the valve body 1, the top side of the spray gun 84 is abutted against the bottom side of the baffle plate 3, and the extending part 14 is positioned above the water inlet end face 812a and is not contacted with the water inlet end face 812 a.

As shown in fig. 1 and 2, when the pre-filter is in a filtering state, the blowoff valve 2 is still in a closed state, and raw water enters the valve body 1 from the water inlet end 1 a. The upper part of the spray gun 84 is located in the filter chamber 1c and abuts against the baffle 3, and the passage of the raw water flowing from the water inlet end 1a to the filter chamber 1c and the water outlet end 1b is cut off, and the raw water flows from the water inlet end 1a into the accommodating chamber 7 through the water inlet hole 61. Because impeller 82 installs in the below of intaking terminal surface 812a, rivers receive pipeline pressure F1's influence, impact impeller 82 for impeller 82360 encircles the inner frame 81 rotation, produce centrifugal force, the rivers through impeller 82 also do 360 rotatory holding chamber 7 in correspondingly, make the raw water with higher speed get rid of along impeller 82 and hold the chamber 7 in, play the effect with higher speed to the raw water. At the beginning, the raw water is left to the lower die cavity 4 from the containing cavity 7 under the action of self gravity and then flows to the water inlet of the drain valve 2. As the amount of water increases, when the lower cavity 4 is filled with raw water, the raw water is introduced into the clean water chamber 13 from the plurality of filter holes 83a of the lower filter screen 83 through the outlet 5 of the spray gun 84 by the pipe pressure F1. The filtered water flowing into the purified water chamber 13 passes through the purified water chamber 13 of the spray gun 84, flows into the filter chamber 1c, is discharged to the water outlet end 1b, and finally flows into the lower full house purified water pipeline.

And opening the drain valve 2 to enable the pre-filter to be in a back-flushing and scraping state. As shown in fig. 3 and 4, the drain pressure F2 is smaller than the water inlet pressure, the drain pressure F2 and the pipe pressure F1 form a downward pressure difference F3, the pressure F3 is greater than the elastic force of the elastic member 86, the pressure F3 acts on the top side of the spray gun 84, and the spray gun 84 is pressed to drive the piston body 85 to move downward, so that the tower spring is compressed and deformed. The top side of the spray gun 84 is not in contact with the baffle 3, and the bottom side of the extension part 14 seals the water inlet hole 61, so that the water inlet hole 61 is not communicated with the water inlet end 1a, and the water inlet end 1a is communicated with the filter chamber 1 c. Raw water flows into the filter cavity 1c from the water inlet end 1a, and because the water inlet end 1a and the water outlet end 1b are positioned on the same horizontal line, and the filter cavity 1c is simultaneously communicated with the water outlet end 1b and the vertically arranged purified water cavity 13, water flow can preferentially flow into the purified water cavity 13 under the influence of self gravity. Before the raw water flows into the spray gun 84, the raw water is filtered into filtered water through the upper filter screen 12, and impurities in the raw water are blocked by the upper filter screen 12. The filtered water flows into the water purifying cavity 13 to wash the inner side of the filter screen through the water outlet 5, the dirt which is strongly attached to the lower filter screen 83 is washed into the accommodating cavity 7, and then the dirt is flushed into the dirt discharging through hole 15 of the piston body 85 along with the water flow and is discharged into the floor drain through the dirt discharging valve 2.

And (3) closing the blowoff valve 2, enabling the pressure of the water inlet end 1a to be consistent with the internal pressure of the pre-filter, resetting the tower-shaped spring, moving the spray gun 84 upwards, enabling the inner framework 81 not to cover the water inlet hole 61 any more, and opening the water inlet hole 61, so that the water enters a normal filtering state.

In summary, in the filtering state, the blowoff valve 2 is closed, the elastic piece is in the normal extension state, the piston body 85 and the spray gun 84 are pushed upwards, the top side of the spray gun 84 is connected with the baffle 3 in the filter chamber 1c, and the water flow channel directly flowing into the filter chamber 1c from the water inlet end 1a is cut off. Raw water flows into the water inlet hole 61 from the water inlet end 1a, is accelerated by the impeller 82 to enter the accommodating cavity 7, flows into the purified water cavity 13 through the filter hole 83a of the lower filter screen 83, enters the filter cavity 1c from the purified water cavity 13 and flows out from the water outlet end 1 b. The impurities are blocked on the accommodating chamber 7 and the lower filter screen 83 by the lower filter screen 83. When the blowoff valve 2 is opened, the spray gun 84 and the piston body 85 move down along the axis under the action of the pressure of the sewage draining port and the pressure of the pipeline, the top side of the spray gun 84 is not abutted against the baffle 3, the elastic piece 86 contracts, the extension part 14 covers the water inlet hole 61, and the water flow is blocked from flowing into the channel 17 of the water inlet hole 61 from the water inlet end 1 a. Raw water is filtered through the upper filter screen 12, impurities in the raw water are separated outside the upper filter screen 12, dirty impurities are prevented from flowing into the water purification cavity 13, the impurities are deposited at the bottom of the water purification cavity 13, water safety of a user is affected, and meanwhile long-term effective work of structures such as the spray gun 84 can be guaranteed. Filtered water flows out from the water outlet 5, washes impurities adhered to the lower filter screen 83, falls into the bottom of the accommodating cavity 7, flows into the lower cavity 4 along with water through the sewage discharge through hole 15, and is finally discharged from the sewage discharge valve 2.

Based on the technical scheme, the spray gun 84 can move up and down in the upper filter screen 12, the upper filter screen 12 is in contact with raw water before the spray gun 84, dirt is isolated outside through the upper filter screen 12, and the dirt cannot permeate into the space between the filter screen and the spray gun 84 like other existing products, so that the spray gun 84 cannot move up and down to influence the back washing function of the spray gun 84. The impeller 82 is rotatably sleeved on the inner framework 81, raw water enters the accommodating cavity 7 from the water inlet hole 61 and impacts the impeller 82, so that the impeller 82 rotates, the raw water is accelerated, the raw water rapidly enters the accommodating cavity 7, the impact is used for accommodating impurities in the cavity 7, the dirt can be prevented from being attached to the accommodating cavity 7 for a long time, the lower filter screen 83 is blocked, and the device can work effectively for a long time. When the drain valve 2 is opened or closed, the pressure in the filter is different, and the elastic piece 86 is arranged to change the upper position and the lower position of the spray gun 84 in the filter cavity 1c, so that the change of a water flow channel is realized, and better filtering and back washing effects are achieved.

Wherein, upper filter screen 12 is connected to the upper part of spray gun 84 through back flush skeleton 16 in a sleeving manner, and back flush skeleton 16 provides a fixing and mounting position for upper filter screen 12. The backwash framework 16 is cylindrical, the backwash framework 16 is sleeved on the upper portion of the spray gun 84, a channel 17 for the spray gun 84 to move up and down is vertically arranged in the backwash framework 16, the spray gun 84 can move up and down in the channel 17, the upper filter screen 12 is fixedly sleeved on the outer side of the backwash framework 16, the top side of the backwash framework 16 is in sealing connection with the bottom side of the baffle plate 3 through the backwash sealing ring 35, the backwash framework 16 is fixedly arranged on the top side of the inner framework 81, a space for the extension portion 14 of the spray gun 84 to move up and down is formed between the bottom side of the backwash framework 16 and the top side of the inner framework 81, a plurality of cleaning through holes 49 are formed in the side face of the backwash framework 16. During backwashing, raw water enters the water passage holes through the plurality of cleaning through holes 49, which is beneficial to increasing the water pressure of the raw water. When the water pressure in the pipeline is low, a plurality of cleaning through holes 49 are formed in the backwashing framework 16 to ensure that water flows into the water purifying cavity 13.

Specifically, as shown in fig. 10, the impeller 82 includes an annular sleeve 821, the sleeve 821 is sleeved outside the inner frame 81, at least two obliquely arranged fins 822 are arranged outside the sleeve 821, an inclination of the fins 822 is 0 ° to 90 °, and an inclination direction may be clockwise or counterclockwise. The fins 822 are obliquely arranged, so that impurities are not easy to attach to the fins for a long time, and dirty deposition caused by long-time pollution discharge is avoided. Inclined water passing channels are formed between the adjacent fins 822. The water passing channel has a flow guiding function, a plurality of water channels are formed between the lower filter screen and the outer framework during filtering, water is uniformly distributed to enter the water passing channel, and water flow is guided to enter the accommodating cavity. The rivers striking drives impeller 82 and rotates on fin 822, and impeller 82 rotates simultaneously, also makes the rivers form the swirl, under pressure and centrifugal force dual function of intaking, has increased water velocity, is favorable to assaulting the dirt of deposit in holding the chamber 7 bottom.

More specifically, as shown in fig. 9, the inner frame 81 includes a water passing portion 811, and the water passing portion 811 has a cylindrical shape. The number of the water passing holes 51 is several, and the water passing holes 51 are uniformly arranged on the peripheral side surface of the water passing part 811 and are used for communicating the filtering holes 83a of the lower filtering net 83 and the purified water cavity 13. The sleeve 821 is sleeved outside the water passing portion 811, the top side of the water passing portion 811 extends along the radial direction to form a water inlet portion 812, the top side of the water inlet portion 812 is a water inlet end face 812a, and the water inlet hole 61 is formed in the water inlet end face 812 a. When the back flush mode is activated, the bottom side of extension 14 abuts against inlet end 812a and covers inlet opening 61. The number of the water inlet holes 61 is plural, and the plural water inlet holes 61 are uniformly arranged at equal intervals with the axis of the inner frame 81 as the center. The water passing part 811 is provided with a clamping platform 18 along the radial extension thereof, the clamping platform 18 surrounds the lower part of the water inlet part 812, the inner side of the sleeve joint body 821 is protruded with at least two clamping sheets 19, and each clamping sheet 19 is uniformly arranged with the axis of the inner framework 81 as the center at equal intervals. The bottom side of the latch piece 19 abuts against the top side of the latch platform 18, so that the socket 821 is latched on the latch platform 18 to ensure that the impeller 82 can rotate around the inner frame 81 and maintain a connection relation with the inner frame 81.

Preferably, the valve core assembly 8 further comprises a water sprayer 87, the water sprayer 87 is positioned in the inner framework 81 and rotatably sleeved on the periphery of the spray gun 84, the bottom side of the water sprayer 87 abuts on the top side of the piston body 85 through the cover 52, the side surface of the water sprayer 87 is provided with a plurality of water spraying holes 20, the water spraying holes 20 are communicated with the filter holes 83a of the lower filter screen 83 and the clean water cavity 13, and water can flow into the clean water cavity 13 from the accommodating cavity 7 through the filter holes 83a and the water spraying holes 20 or reversely flow into the accommodating cavity 7 from the clean water cavity 13. The total opening area of the water spray holes 20 is smaller than the cross-sectional area of the top end of the clear water cavity 13. In the back flushing state, the blowoff valve 2 is opened, water flows into the water spray holes 20 from the water outlet 5 of the spray gun 84, and the water spray holes 20 play a role of pressurization under the pressure of the pipeline because the cross-sectional area of the top end of the clear water cavity 13 is larger than the total opening area of the water spray holes 20. Under the effect of water pressure, pressure in the upper end of the water sprayer 87 is greater than pressure in the lower end, internal pressure is greater than external pressure, pressure difference is formed between the water spray holes 20 and the water purification cavity 13, pressure at the outlet of the water spray holes 20 is increased, water flow is pressurized when passing through the water spray holes 20, the water flow with enhanced pressure can drive the water sprayer 87360 to rotate and move up and down, the water sprayer 87 is from top to bottom, and the filter screen 83 is sprayed from inside to outside, so that the effect of rotary spraying is realized. The water flow sprayed from the water spray holes 20 washes the inner side of the lower filter screen 83, and the lower filter screen 83 is washed strongly from inside to outside, so that the dirt strongly attached to the filter screen 83 can be easily and effectively removed, and the effective back washing effect is achieved. The water spray 87 is divided into an upper part and a lower part, the upper part of the water spray 87 is in the shape of a circular truncated cone, the inner wall of the water spray 87 is attached to the outer wall of the upper part of the spray gun 84, and the water spray hole 20 is arranged at the lower part of the water spray 87. The upper part of the water sprayer 87 is provided with a plurality of water flowing channels 21, the water flowing channels 21 are positioned at the bottom side of the upper part of the water sprayer 87, and the water flowing channels 21 are respectively communicated with the purified water cavity 13 and the filtering holes 83 a. The water channel 21 is arranged on the water sprayer 87, so that the rapid water flow after passing through the impeller 82 can rush through the water channel 21 and enter the water purifying cavity 13. In the filtering state, water flows from the lower filter screen 83 into the clean water chamber 13 through the water flow passage 21 along the upper end of the water sprayer 87 under the action of the pipe pressure.

In addition, the prefilter further comprises an outer frame 22, wherein the outer frame 22 is installed in the housing 11, the inner frame 81 and the piston body 85 are both installed in the outer frame 22, and the outer frame 22 can fix the positions of the inner frame 81 and the piston body 85. The bottom of the outer framework 22 is connected with the top side of the blowoff valve 2, the containing cavity 7 is divided into an upper cavity 71 and an outer cavity 72 by the outer framework 22, the upper cavity 71 is formed between the outer framework 22 and the inner framework 81, the outer cavity 72 is formed between the outer framework 22 and the shell 11, the upper cavity 71 is respectively communicated with the water inlet hole 61 and the filter hole 83a, the blowoff through hole 15 is communicated with the upper cavity 71 and the lower cavity 4, and dirty dirt and dirt are distributed at the bottom of the upper cavity 71. The impeller 82 is positioned above the outer framework 22, and the distance between the top surface of the outer framework 22 and the water inlet end surface 812a of the inner framework 81 is greater than the height of the impeller 82, so that the impeller 82 can rotate by 360 degrees. As shown in fig. 18, the bottom of exoskeleton 22 is provided with a sealing bevel 59. The sealing slope 59 is sealed with the bottom of the piston body 85 by the Y-shaped packing 50 (shown in fig. 28). The outer frame 22 is connected with the drain valve 2 through the connecting piece 10, the top side of the connecting piece 10 is connected with the outer frame 22, and the bottom side of the connecting piece 10 is in threaded connection with the top side of the drain valve 2. The bottom side of the elastic piece 86 is abutted against the top side of the connecting piece 10, the piston body 85, the outer framework 22 and the connecting piece 10 form a lower cavity 4, the connecting piece 10 vertically penetrates through a water through hole 23, and the water through hole 23 is communicated with the lower cavity 4 and a water inlet of the drain valve 2. The connector 10 is used to connect the exoskeleton 22 and the waste valve 2. The connector 10 includes an outer connector 101 and an inner connector 102, the inner connector 102 is sleeved in the outer connector 101, as shown in fig. 4, and the inner connector 102 and the outer connector 101 are hermetically connected by a connection sealing ring 36. The inner connecting piece 102 is in threaded connection with the drain valve 2, the bottom side of the outer framework 22 is provided with a polygonal convex part, the top side of the outer connecting piece 101 is provided with a polygonal hole matched with the polygonal convex part, and the outer connecting piece 101 is connected with the bottom side of the outer framework 22 through the polygonal convex part clamped in the polygonal hole. The lower end of the outer connecting piece 101 is provided with a clamp spring groove, and the clamp spring 44 is sleeved in the clamp spring groove, so that the outer connecting piece 101 is fixed at the lower end of the filter flask 24.

In addition, the prefilter includes a filter flask 24, the filter flask 24 protecting the exoskeleton 22 and the valve core assembly 8, the filter flask 24 being mounted in the outer cavity 72. As shown in fig. 4, the exoskeleton 22 is sealingly mounted in the filter flask 24 by a first sealing ring 37. Filter flask 24 detachably installs in casing 11, and filter flask 24 is connected with valve body 1 detachably, and filter flask 24's top is equipped with the external screw thread, and valve body 1's bottom side is equipped with the internal thread, and filter flask 24 is connected with valve body 1 through threaded connection's mode. The filter flask 24 is connected to the valve body 1 in a sealing manner by means of a second sealing ring 38. As shown in fig. 17, the filter flask 24 is provided with a projection 56 on its outer periphery. When the water quality is poor for a long time, under the condition that the pre-filter cannot be normally cleaned, a worker can unscrew or tighten the filter flask 24 according to the instruction by using the special wrench 45 (the special wrench 45 is provided with the concave part matched with the bulge 56), and then the internal lower filter screen 83 and the filter flask 24 are detached and washed. The material of the filter flask 24 and the housing 11 can be transparent material, when the impeller 82 rotates, the user can observe the water inlet condition through the transparent filter flask 24, and the visualization effect is better.

At least two scraping and cleaning pieces 25 are connected to the outer framework 22, and the scraping and cleaning pieces 25 are uniformly distributed on the outer framework 22. The outer side of the scraping and washing piece 25 is attached to the inner wall of the filter flask 24, so that the inner wall of the filter flask 24 can be scraped and washed, and the inner wall of the filter flask 24 can be kept clean. The inner side of the scraper 25 is attached to the outer side of the lower filter screen 83 to brush the lower filter screen 83 and remove stubborn dirt on the lower filter screen 83. Because the scraping and washing piece 25 is connected on the outer framework 22, the outer framework 22 is connected on the blow-off valve 2 through the connecting piece 10, and the blow-off valve 2 is installed on the shell body 11, therefore, the shell body 11 is rotated to drive the scraping and washing piece 25 to rotate in the filter flask 24, the filter flask 24 and the lower filter screen 83 are scraped and washed, and the scraping and washing functions are realized. As shown in fig. 22, the inner side of the scraper 25 is provided with an inner scraper 27 disposed obliquely, and the inner scraper 27 is attached to the lower filter screen 83. The inner scraping and washing strip 27 is obliquely arranged, so that scraped dirt has an inclination which can flow out downwards along with water flow, and meanwhile, water washed by back flushing can rotate along with the inclination to form centripetal force, so that the cleaning effect is improved, and stubborn stains on the lower filter screen 83 are removed. The outer side of the scraping and washing piece 25 is provided with an outer scraping and washing strip 26 which is obliquely arranged, the outer scraping and washing strip 26 is attached to the filter flask 24, the oblique direction of the outer scraping and washing strip 26 is the same as that of the fins 822, and when the impeller 82 rotates along the lower filter screen 83, the outer scraping and washing strip 26 which is the same as that of the fins 822 of the impeller 82 does not influence the rotating direction of water flow. Meanwhile, the scraped dirt flows down on the outer scraping strip along with water flow and is discharged into the blow-down valve 2 along with the blow-down through hole 15, so that a better blow-down effect is achieved, and the cleanness of the outer scraping and washing strip 26 can be kept. In this embodiment, the inclination angles of the outer wiping strip 26 and the inner wiping strip 27 are 0 ° to 90 °.

Alternatively, as shown in fig. 17, the housing 11 includes an upper housing 111 and a lower housing 112 detachably connected to the upper housing 111, specifically, the detachable connection can be realized by clamping or the like. In other embodiments, the upper housing 111 and the lower housing 112 may be connected by other methods, and are not limited to this example. The outer frame 22 and the filter flask 24 are both arranged in the upper shell 111, the drainage valve 2 and the connecting piece 10 are fixedly arranged in the lower shell 112, and the drainage valve 2 can be arranged in the lower shell 112 in a threaded manner. The lower housing 112 is rotated to drive the scraper 25 on the outer frame 22 to scrape the filter flask 24 and the lower filter screen 83. As shown in fig. 20, the lower case 112 is provided with a cartridge hole 57. A lower cover 55 is arranged in the lower housing 112, as shown in fig. 19, a card 58 is arranged on the lower cover 55, and the lower cover 55 is clamped in the card seat hole 57 through the card 58 to realize connection with the lower housing 112. The upper end of the lower cover 55 supports the bottom side of the filter flask 24 to ensure that the filter flask 24 is vertically arranged. The lower cover 55 is provided with an installation inclined plane 60 which is matched with the bottom plate of the outer connecting piece 101 in a positioning way, so that the connecting piece 10 is connected on the lower cover 55. As shown in FIG. 17, the upper housing 111 includes a front enclosure 1111 and a rear enclosure 1112, the front enclosure 1111 and the rear enclosure 1112 being removably attached. The rear cover 1112 is fixedly connected with a magnet 48, and the front cover 1111 is provided with a metal piece with magnetism or a magnet with magnetism opposite to that of the magnet 48. The surface of the front cover 1111 is provided with a positioning convex part 62, the rear cover 1112 is provided with a positioning groove 63 matched with the positioning convex part 62, the front cover 1111 and the rear cover 1112 are connected in a magnetic attraction mode, and meanwhile, the positioning convex part 62 is clamped into the positioning groove 63, so that the front cover 1111 and the rear cover 1112 are detachably connected. The front cover 1111 and the rear cover 1112 are connected by a magnetic attraction manner, so that a user can easily open the filter and can simply mount the filter back. When it is desired to periodically clean the cartridge assembly, the lower housing 112 is rotated so that the wiper 25 wipes the filter flask 24 and the lower filter screen 83. The front cover body 1111 and the rear cover body 1112 are detached, the filter flask 24 is unscrewed by using the special wrench 45, the valve core assembly 8 is taken out, the lower filter screen 83 is brushed by using a brush, and deposited, stubborn and ultra-strong attached dirt on the lower filter screen 83 due to long-time non-cleaning or over-poor water quality and other reasons is removed, so that the dirt can be thoroughly removed, and the service life of the product can be prolonged. Because upper filter screen 12 is only sleeved on backwash framework 16, after filter flask 24 is disassembled, backwash framework 16 can be disassembled from inner framework 81, and upper filter screen 12 can be disassembled for cleaning. When a user needs to be installed outdoors and is under the condition of illumination, the shell 11 has light transmission, algae can be easily bred in the inner cavity of the transparent filter bottle 24, and the water quality and the performance of the pre-filter are affected, so that the problem that the pre-filter needs to be installed outdoors and algae can be easily bred is solved by spraying a light-proof material or sticking a light-proof film on the inner wall of the shell 11, and the pre-filter provided by the invention is not limited by the environment and can be installed indoors or outdoors.

Preferably, as shown in fig. 1, a protective casing 28 is disposed outside the valve body 1, and the protective casing 28 is used for protecting the valve body 1 from external factors, so as to ensure that the valve body 1 can normally operate. The bottom side of the protective case 28 is connected to the upper case 111. Install manometer 29 in the protective housing 28 (see fig. 23), as shown in fig. 6, still be equipped with manometer water measuring end 1d on the valve body 1, manometer water measuring end 1d and manometer 29 are connected, are provided with the manometer hole that is used for installing manometer 29 on the manometer test end 1d, and manometer 29 imbeds in the manometer hole, can realize the visual, real-time effect of pressure monitoring. The user can know the pressure in the pre-filter from the change in pressure value displayed by the pressure gauge 29. The protective shell 28 is provided with a protective lens 30, and the protective lens 30 corresponds to the pressure gauge 29. The pressure gauge 29 is enclosed by the protective shell and the protective lens 30, and the pressure gauge 29 is effectively protected from being damaged by external force.

Further, be equipped with memory knob 9 on the protective housing 28, convenience of customers notes next corresponding cleaning time, plays the warning function. The memory knob 9 includes a recording disk 91 and a turntable 92, the recording disk 91 and the turntable 92 are both circular in cross-sectional shape, and the recording disk 91 is attached to the top side of the protective case 28 body 6. The recording disc 91 is provided with a card hole for the turntable 92 to be clamped in, and the upper surface of the recording disc 91 is provided with 1-12 numbers around the periphery of the card hole along the clockwise direction. As shown in fig. 27, at least two elastic buckles 47 are arranged on the bottom side of the rotating disc 92, and the material of the elastic buckles 47 is plastic. The elastic buckles 47 are sheet-shaped structures which are obliquely arranged towards the outer side of the rotating disc 92, each elastic buckle 47 surrounds a circle, and the outer diameter of the circle formed by each elastic buckle 47 is larger than the inner diameter of the clamping hole. During installation, the turntable 92 is pressed downwards, so that the turntable 92 is clamped into the clamping hole, and the elastic buckle 47 is stressed to tightly press against the clamping hole, so that the turntable 92 is clamped in the recording disc 91 and is rotatably connected to the recording disc 91. In this embodiment, as shown in fig. 26, the periphery of the turntable 92 extends with a convex tooth 40, the inner wall of the card hole of the recording disc 91 is provided with a plurality of arc-shaped grooves 41 matching with the convex tooth 40, and a gap is formed between the convex tooth 40 and the arc-shaped grooves 41. The turntable 92 is provided with a handle 42, one end of the handle 42 is provided with a convex part 43, the handle 42 is rotated to enable the convex teeth 40 to rotate between the arc-shaped grooves 41, and the number, which is arranged on the recording disc 91 and is pointed by the convex part 43 of the handle 42, is the corresponding cleaning month. For example, after the user has cleaned the pre-filter in 1 month and 15 days, the user rotates the dial 92 to make the convex portion 43 correspond to the intermediate position between 1 and 2, records that the user has cleaned in the middle ten days of 1 month, and needs to clean the filter 1 time in 1 month according to the use requirement, that is, the user can be reminded to clean the pre-filter in 2 months and 15 days later, and the user can also check the last cleaning time at any time in the following date. The user has cleaned at every turn and has rotated carousel 92, can take notes the cleaning time, and convenient good usefulness can in time remind the user to wash the water purification.

Preferably, as shown in fig. 29, the valve body 1 is provided with a pressure-stabilizing regulating valve 31 capable of regulating the pressure of the raw water flowing from the pipe into the water inlet end 1 a.

In addition, the prefilter still includes blowdown knob 46, and blowdown knob 46 is connected with blowoff valve 2, and concrete accessible screw or U type jump ring are connected. The drain knob 46 is rotatably coupled to the outside of the housing 11. Turning the waste knob 46 controls the closure of the waste valve 2.

It is worth mentioning that the part material of the pre-filter is low-lead brass, such as brass in the patent with the publication number of CN104032176A or CN104004941A or CN106103755A, the lead precipitation content of the product is greatly reduced through the modified low-lead technology and the lead removing treatment technology on the surface of the copper part, and the lead heavy metal precipitation content is greatly lower than the national standard, so that the secondary pollution of heavy metal is avoided, and the healthy drinking water of users is really achieved.

Example two

Referring to fig. 30 and 31, the difference between the present embodiment and the first embodiment is that the pre-filter in the second embodiment includes a controller 33 and a power source 34, the controller 33 and the power source 34 are both installed outside the housing 11, the power source 34 is electrically connected to the controller 33, the controller 33 is electrically connected to the waste valve 2, the power source 34 may be a lithium battery or other batteries to provide power to the controller 33, the controller 33 may be a P L C controller 33, and the controller 33 controls the waste valve 2 to close without manually opening or closing the waste valve 2, so as to automatically open or close the waste valve 2.

As shown in fig. 30, the pre-filter may be a gimbaled pre-filter. The valve body 1 is provided with a universal adapter 39, so that the front filter can be conveniently installed in a pipeline with a complex position by a worker.

Except for the above differences, other structures of the present embodiment are the same as those of the first embodiment, and corresponding effects and principles are also the same, which are not described herein again.

EXAMPLE III

Referring to fig. 32, the prefilter of the third embodiment differs from the second embodiment in that: the power supply is powered by an external power supply, an alternating current plug 32 for being electrically connected with the external power supply extends out of the lower shell 112, and the controller 33 is integrated in the lower shell 112, so that the installation space of the pre-filter is saved.

Except for the above differences, other structures of this embodiment are the same as those of the first and second embodiments, and corresponding effects and principles are also the same, which are not described herein again.

The working process of the invention is as follows:

in a filtering state, raw water enters the filter cavity 1c through the water inlet end 1a of the valve body 1 and then flows into the water passing channels obliquely arranged on the impeller 82 along the water inlet holes 61 in the inner frame 81, the impeller 82 is driven by water flow under the action of pipeline pressure F1 and centripetal force to rotate for 360 degrees, and the water passing channels rotating out of the water passing channels correspondingly rotate for 360 degrees and enter the upper cavity 71 between the lower filter screen 83 and the outer frame 22. Since the scraping and washing members 25 are uniformly distributed on the outer frame 22, the inclination directions of the outer scraping and washing strips 26 and the inner scraping and washing strips 27 on the scraping and washing members 25 are the same as the inclination directions of the fins 822, the water channel which rotates out is not influenced by the scraping and washing members 25, and the rotating water channel quickly enters the filtering holes 83a on the lower filtering net 83. The diameter of the filter hole 83a is set according to the size of the filtered impurities. The rotating water flow can enter the inner side of the lower filter screen 83, and impurities are blocked outside the lower filter screen 83 and deposited at the lower end of the upper cavity 71 or attached to the lower filter screen 83. The filtered water passing through the lower filter screen 83 enters the clean water chamber 13 in the spray gun 84 along the upper end of the water sprayer 87 and the water flow path 21 by the pipe pressure F1. The water is discharged into the water outlet end 1c through the water purifying cavity 13 and flows into the water purifying pipeline of the whole house at the lower end. During this process, the waste valve 2 is in a closed state.

When back flushing is needed, under the condition that the tail end pipeline element fitting is not in a working state, the drain knob 46 is opened anticlockwise, the drain ball valve 2 is in an open state, a large pressure difference F3 is formed between drain outlet pressure F2 and pipeline pressure F1, and under the action, the extension part 14 of the spray gun 84 is driven by the pressure difference F3 to drive the water sprayer 87, the sealing cover 52, the piston body 85, the Y-shaped sealing gasket 50 and the related sealing gasket to compress the tower-shaped spring. Until the lower end surface of the extension portion 14 is tightly attached to the water inlet end surface 812a of the inner frame 81, the tower spring is compressed and deformed, and the Y-shaped gasket 50 forms a seal with the inclined seal surface 59 inside the outer frame 22. When the raw water is switched from the original filtering state to the back flushing state, the raw water washes the upper filter screen 12 from the filter chamber 1c, and the water flows into the purified water chamber 13 through the cleaning through holes 49 at the upper end of the back flushing framework 16. The impurities in the raw water are blocked by the upper filter screen 12, and the filtered water entering the water purifying chamber 13 flows into the water sprayer 87 through the water outlet of the spray gun 84, and then enters the water spraying holes 20 on the water sprayer 87. In this state, the inner cavity pressure difference can be formed, the cross-sectional area of the upper end of the water purifying cavity 13 is larger than the total surface area of the water spraying holes 20, so that the pressure at the outlet of the water spraying holes 20 is increased, the water sprayer 87 rotates 360 degrees and moves up and down, the pressurized filtered water is sprayed on the inner side of the lower filter screen 83, the dirt which is strongly attached to the lower filter screen 83 is powerfully washed into the upper cavity 71, and then the dirt is flushed into the dirt discharging through hole 15 of the piston body 31 along with the water flow and discharged out of the filter through the dirt discharging valve 2. The lower shell 112 is rotated, the connecting piece 10 drives the outer framework 22 to rotate along with the lower shell 112, the outer scraping and washing strip 26 of the scraping and washing piece 25 arranged on the outer framework 22 scrapes and washes dirt on the inner wall of the filter bottle 24, the inner scraping and washing strip 27 scrapes and washes the outer side of the lower filter screen 83, accumulated dirt on the lower filter screen 83 is effectively removed, and meanwhile, the scraping and washing dirt is flushed into the sewage discharge through hole 15 of the piston body 31 along with water flow and discharged out of the filter through the sewage discharge valve 2. Under the condition of deposition, stubborn and super-strong attached dirt caused by long-time non-cleaning or over-poor water quality and the like, the main water inlet valve and the tail end pipeline switch can be turned off firstly, the filter flask 24 is unscrewed by the special wrench 45 attached to the filter, the valve core assembly 8 in the filter flask 24 is taken out, the piston body 85 is unscrewed, the lower filter screen 82 is taken out downwards, the stubborn dirt on the lower filter screen 82 is brushed off by the brush, then the lower filter screen 82 is put back, and the filter flask 24 is screwed down. Through multiple combined cleaning, not only can the strong attached dirt in the lower filter screen 83 be removed, but also the strong attached dirt on the upper inner wall of the filter bottle 24 can be removed.

To sum up, the embodiment of the present invention provides a prefilter, which has the following beneficial effects:

the upper filter screen is arranged outside the spray gun, when the spray gun is back flushed, the upper end of the spray gun and the upper filter screen are exposed out of the filter cavity, raw water is filtered by the upper filter screen and then enters the interior of the spray gun for back flushing operation, and because the spray gun moves in the interior of the upper filter screen, dirt cannot enter between the upper filter screen and the spray gun to influence the normal operation of back flushing, so that a back flushing structure can be protected from long-term and effective operation;

the impeller is rotatably sleeved on the inner framework, raw water enters the accommodating cavity from the water inlet and impacts the impeller to rotate the impeller, and meanwhile, the raw water is accelerated and can rapidly enter the accommodating cavity to impact impurities in the accommodating cavity, so that the phenomenon that dirt is attached to the accommodating cavity for a long time to cause the blockage of the lower filter screen can be avoided, and the service life of the filter can be prolonged;

when the blowoff valve is opened, the pressure difference formed between the water inlet end and the drain outlet makes the pressure in the filter different, and the elastic element is arranged to change the upper and lower positions of the spray gun in the filter cavity, so that the valve core assembly moves along the axial direction, the spray gun moves down along the axis, the extension part of the spray gun seals the water inlet hole of the inner framework, a back washing water passage is formed between the spray gun and the lower filter screen, the change of the water flow passage is realized, and the better filtering and back washing effects are achieved.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. The prefilter is characterized by comprising a valve body, a shell, a valve core assembly and a blowdown valve, wherein the valve body is arranged at the top end of the shell, the valve core assembly and the blowdown valve are both arranged in the shell,

2. The prefilter of claim 1 wherein said upper filter screen is sleeved on the upper part of said spray gun through a back-washing frame, said upper filter screen is fixedly sleeved on the outer side of said back-washing frame, said back-washing frame is sleeved on the upper part of said spray gun, a channel for said spray gun to move up and down is vertically arranged in said back-washing frame, the top side of said back-washing frame is connected with the bottom side of said baffle, said back-washing frame is arranged on the top side of said inner frame, the bottom side of said back-washing frame and the top side of said inner frame form a space for said extension part of said spray gun to move up and down, and the side of said back-washing frame is provided with a plurality of cleaning through.

3. The prefilter of claim 1 wherein said impeller includes an annular sleeve-connected body, said sleeve-connected body is sleeved outside said inner frame, at least two obliquely arranged fins are arranged outside said sleeve-connected body, and an oblique water channel is formed between two adjacent fins.

4. The pre-filter of claim 3, wherein the inner frame comprises a water passing part, the water passing part is cylindrical, the water passing through hole is arranged on the side surface of the water passing part, the sleeve body is sleeved outside the water passing part, a water inlet part extends along the radial direction on the top side of the water passing part, the top side of the water inlet part is a water inlet end surface, and the water inlet hole is arranged on the water inlet end surface.

5. The prefilter of claim 4 wherein said water inlet portion has a snap-in platform extending radially therefrom, said snap-in platform surrounding said water inlet portion,

6. The prefilter of claim 1 wherein said cartridge assembly further comprises a water sprayer, said water sprayer is located in said inner frame and rotatably sleeved on the outer periphery of said spray gun, the bottom side of said water sprayer abuts against the top side of said piston body, the side of said water sprayer is provided with a plurality of water spray holes, said water spray holes are communicated with said filter holes of said lower filter screen and said clean water chamber, and the total area of each of said water spray holes is smaller than the cross-sectional area of the top end of said clean water chamber.

7. The prefilter of claim 6 wherein said water sprayer has a water flow passage at its upper portion, said water flow passage communicating with said clean water chamber and said filter aperture, respectively.

8. The prefilter of claim 1 further comprising an outer frame, said outer frame being mounted within said housing, said inner frame and said piston body both being mounted within said outer frame, a bottom of said outer frame being connected to a top side of said blowoff valve, said outer frame dividing said holding cavity into an upper cavity and an outer cavity, said upper cavity being formed between said outer frame and said inner frame, said outer cavity being formed between said outer frame and said housing, said upper cavity being in communication with said inlet opening and said filter opening, respectively, said blowoff through opening being in communication with said upper cavity and said lower cavity.

9. The prefilter of claim 8 wherein said outer frame is connected to said blowoff valve by a connecting member, said connecting member having a top side connected to said outer frame, said connecting member having a bottom side connected to a top side of said blowoff valve, said elastic member having a bottom side abutting the top side of the connecting member, said piston body, said outer frame and said connecting member defining said lower cavity, said connecting member having a water passage extending vertically therethrough, said water passage communicating said lower cavity with said water inlet of said blowoff valve.

10. The prefilter of claim 9 further comprising a filter cartridge, said filter cartridge being removably mounted within said housing, said filter cartridge being removably connected to said valve body, said exoskeleton being mounted within said filter cartridge.

11. The prefilter of claim 10 wherein said outer frame has attached thereto at least two scraping elements, the outer sides of said scraping elements engaging the inner walls of said filter flask, and the inner sides of said scraping elements engaging the outer sides of said lower filter screen.

12. The prefilter of claim 11 wherein said scraper is provided on its outer side with obliquely disposed outer scraper bars engaging said filter flask, said outer scraper bars being inclined in the same direction as said fins,

13. The prefilter of claim 8 wherein said housing comprises an upper housing and a lower housing removably connected to said upper housing, said exoskeleton being mounted in said upper housing, said waste valve and said attachment member being fixedly mounted in said lower housing.

14. The prefilter of claim 13 wherein said upper housing includes a front housing body and a rear housing body, said front housing body and said rear housing body being removably attached.

15. The prefilter of claim 1 wherein said valve body is externally provided with a protective shell, said protective shell being attached to a top side of said housing.

16. The prefilter of claim 15 wherein said protective shell has a pressure gauge mounted therein, said protective shell having a protective lens mounted thereon, said protective lens corresponding to the position of said pressure gauge.

17. The prefilter of claim 15 wherein said protective shell has a memory knob, said memory knob including a recording disk and a turntable, said recording disk being attached to a top side of said protective shell, said turntable being rotatably attached to said recording disk.

18. The prefilter of any one of claims 1 to 17 wherein said valve body is provided with a pressure regulator valve.

19. The prefilter of any one of claims 1 to 17 further comprising a drain knob, said drain knob being connected to said drain valve, said drain knob being rotatably connected outside said housing.

20. The prefilter of any one of claims 1 to 17 further comprising a controller and a power source, said controller and said power source both being mounted outside said housing, said power source being electrically connected to said controller, said controller being electrically connected to said blowoff valve.