A pre-filter

Abstract

This invention relates to the field of filter technology and discloses a pre-filter, which includes a valve body, a housing, a valve core assembly, and a drain valve. The valve body is installed at the top of the housing, and the valve core assembly and the drain valve are both installed inside the housing. The valve body has an inlet end, an outlet end, and filter chambers communicating with the inlet end and the outlet end respectively. A baffle extends downward from the top side of the inner wall of the filter chamber. The valve core assembly includes an inner frame, an impeller, a lower filter screen, a spray gun, a piston body, and an elastic element. The pre-filter provided by this invention solves the problem of large particles of dirt remaining and being difficult to rinse away with a simple drain operation, making it convenient and quick to operate.

Description

Technical Field

[0001] The invention relates to the technical field of filters, in particular to a pre-filter. Background Art

[0002] The pre-filter is the first coarse filtration device for the water used in the whole house. It can filter out mud, rust, algae and other large particles of impurities in tap water. It is usually installed behind the water meter in the water inlet pipe.

[0003] At present, most of the backwash pre-filters on the market will have dirt accumulation and clogging gaps after being used for a period of time. This is because: the backwash filter is installed inside the upper end of the filter element. When the filter element moves up and down during operation, impurities in the raw water first enter the filter element with the raw water, and then flow into the filter. The impurities will fall into the gap between the filter and the inner wall of the filter element, causing dirt accumulation over a long period of time, affecting the normal operation of the backwash function. In addition, the existing pre-filter has a poor backwashing decontamination effect. Dirt often accumulates at the bottom of the pre-filter, which easily clogs the filter and affects the filtering work. Summary of the invention

[0004] The purpose of the present invention is to provide a pre-filter which can solve the problem that large particles of dirt and residues are difficult to rinse out with a simple sewage discharge operation, and the operation is convenient and quick.

[0005] In order to achieve the above object, the present invention provides a pre-filter, which includes a valve body, a shell, a valve core assembly and a drain valve, wherein the valve body is installed at the top of the shell and the drain valve is installed in the shell.

[0006] The valve body is provided with a water inlet end, a water outlet end and a filter cavity respectively connected with the water inlet end and the water outlet end, and a baffle is extended downward from the top side of the inner wall of the filter cavity.

[0007] The valve core assembly includes an inner frame, an impeller, a lower filter, a spray gun, a piston body and an elastic member. The inner frame is installed in the shell. The top side of the inner frame is provided with a water inlet hole. The side of the inner frame is provided with a water through hole. The impeller is located below the water inlet hole and is rotatably mounted outside the inner frame. The lower filter is sleeved outside the inner frame. A accommodating cavity is formed between the lower filter and the shell, and the accommodating cavity is communicated with the water inlet hole. The spray gun is vertically installed in the inner frame. An upper filter screen is sleeved on the outer side of the upper part of the gun, and the top side of the upper filter screen is connected to the bottom side of the baffle. A clean water chamber is vertically penetrated through the spray gun, and the clean water chamber is communicated with the filter chamber and the accommodating chamber respectively. The spray gun is provided with an extension portion along its radial direction, and the spray gun can move up and down in the inner skeleton and the upper filter screen. When the spray gun moves up, the top side of the spray gun abuts against the baffle, and the water inlet end is communicated with the water inlet hole. When the spray gun moves down, the extension portion covers the top of the water inlet hole.

[0008] The piston body is installed on the bottom side of the spray gun, and a lower cavity is formed between the piston body, the shell and the drain valve. The bottom of the lower cavity is connected to the water inlet of the drain valve. The piston body is provided with a drain through hole, which is respectively connected to the accommodating cavity and the lower cavity. The elastic member is arranged in the lower cavity, the top side of the elastic member is connected to the piston body, and the bottom side of the elastic member is connected to the top side of the drain valve.

[0009] As a preferred embodiment, the upper filter is sleeved on the upper part of the spray gun through a backwash frame, the upper filter is fixedly sleeved on the outer side of the backwash frame, the backwash frame is sleeved on the upper part of the spray gun, a channel for the spray gun to move up and down is vertically provided in the backwash frame, the top side of the backwash frame is connected to the bottom side of the baffle, the backwash frame is arranged on the top side of the inner frame, the bottom side of the backwash frame and the top side of the inner frame form a space for the extension part of the spray gun to move up and down, and a plurality of cleaning through holes are provided on the side of the backwash frame.

[0010] As a preferred solution, the impeller comprises an annular sleeve body, the sleeve body is sleeved on the outside of the inner frame, the outside of the sleeve body has at least two inclined fins, and an inclined water passage is formed between two adjacent fins.

[0011] As a preferred embodiment, the inner skeleton includes a water passing portion, the water passing portion is cylindrical in shape, the water passing hole is arranged on the side of the water passing portion, the sleeve body is sleeved outside the water passing portion, the top side of the water passing portion has a water inlet portion extending radially, the top side of the water inlet portion is a water inlet end face, and the water inlet hole is arranged on the water inlet end face.

[0012] As a preferred solution, the water passing portion is provided with a clamping platform extending along its radial direction, and the clamping platform surrounds the lower part of the water inlet portion.

[0013] At least two clamping plates are protruded from the inner side of the sleeve body, and the bottom sides of the clamping plates are in contact with the top side of the clamping platform.

[0014] As a preferred embodiment, the valve core assembly also includes a water sprayer, which is located in the inner skeleton and rotatably sleeved on the outer periphery of the spray gun, the bottom side of the water sprayer abuts against the top side of the piston body, and a plurality of water spray holes are provided on the side of the water sprayer, the water spray holes connect the filter holes of the lower filter screen and the clean water chamber, and the total area of ​​each of the water spray holes is smaller than the cross-sectional area of ​​the top of the clean water chamber.

[0015] As a preferred solution, a water flow channel is provided on the upper portion of the sprinkler, and the water flow channel is communicated with the water purification chamber and the filter hole respectively.

[0016] As a preferred embodiment, it also includes an exoskeleton, which is installed in the shell, and the inner skeleton and the piston body are both installed in the exoskeleton. The bottom of the exoskeleton is connected to the top side of the drain valve. The exoskeleton divides the accommodating cavity into an upper cavity and an outer cavity. The upper cavity is formed between the exoskeleton and the inner skeleton, and the outer cavity is formed between the exoskeleton and the shell. The upper cavity is connected to the water inlet hole and the filter hole respectively, and the drain through hole is connected to the upper cavity and the lower cavity.

[0017] As a preferred embodiment, the exoskeleton is connected to the drain valve through a connecting piece, the top side of the connecting piece is connected to the exoskeleton, the bottom side of the connecting piece is connected to the top side of the drain valve, the bottom side of the elastic piece abuts against the top side of the connecting piece, the piston body, the exoskeleton and the connecting piece form the lower cavity, the connecting piece is vertically penetrated by a water hole, and the water hole connects the lower cavity and the water inlet of the drain valve.

[0018] As a preferred solution, it further comprises a filter bottle, which is detachably mounted in the shell, the filter bottle is detachably connected to the valve body, and the exoskeleton is mounted in the filter bottle.

[0019] As a preferred solution, at least two scraping members are connected to the outer frame, the outer sides of the scraping members are in contact with the inner wall of the filter bottle, and the inner sides of the scraping members are in contact with the outer side of the lower filter screen.

[0020] As a preferred solution, an inclined outer scraping strip is provided on the outer side of the scraping member, the outer scraping strip is in contact with the filter bottle, and the inclination direction of the outer scraping strip is the same as the inclination direction of the fin.

[0021] An inner scraping strip is arranged obliquely on the inner side of the scraping member, and the inner scraping strip is fitted with the lower filter screen.

[0022] As a preferred solution, the shell includes an upper shell and a lower shell detachably connected to the upper shell, the exoskeleton is installed in the upper shell, and the drain valve and the connecting piece are fixedly installed in the lower shell.

[0023] As a preferred solution, the upper shell includes a front cover and a rear cover, and the front cover and the rear cover are detachably connected.

[0024] As a preferred solution, a protective shell is provided on the outside of the valve body, and the protective shell is connected to the top side of the shell.

[0025] As a preferred solution, a pressure gauge is installed in the protective shell, and a protective lens is installed on the protective shell, and the position of the protective lens corresponds to that of the pressure gauge.

[0026] As a preferred solution, a memory knob is provided on the protective shell, and the memory knob includes a recording disk and a turntable, the recording disk is connected to the top side of the protective shell, and the turntable is rotatably connected to the recording disk.

[0027] As a preferred solution, a pressure-stabilizing regulating valve is provided on the valve body.

[0028] As a preferred solution, it also includes a sewage discharge knob, which is connected to the sewage discharge valve and is rotatably connected to the outside of the shell.

[0029] As a preferred solution, it also includes a controller and a power supply, wherein the controller and the power supply are both installed outside the shell, the power supply is electrically connected to the controller, and the controller is electrically connected to the drain valve.

[0030] Compared with the prior art, the pre-filter of the embodiment of the present invention has the following beneficial effects:

[0031] 1. The upper filter screen of the embodiment of the present invention is arranged outside the spray gun. During backwashing, the upper end of the spray gun and the upper filter screen are exposed in the filter cavity. The raw water is filtered through the upper filter screen and then enters the spray gun for backwashing. Since the spray gun moves inside the upper filter screen, dirt will not enter between the upper filter screen and the spray gun to affect the normal operation of backwashing, and the backwashing structure can be protected to work effectively for a long time.

[0032] 2. An impeller is rotatably mounted on the inner frame. Raw water enters the containing chamber from the water inlet hole and impacts the impeller, causing the impeller to rotate. At the same time, the raw water is accelerated and can quickly enter the containing chamber, impacting the impurities in the containing chamber, which can prevent dirt from adhering to the containing chamber for a long time and causing the lower filter screen to be blocked, which is beneficial to prolonging the service life of the filter;

[0033] 3. When the drain valve is opened, the pressure difference between the water inlet and the drain port makes the pressure inside the filter different. By setting the elastic part, the upper and lower positions of the spray gun in the filter chamber are changed, so that the valve core assembly moves axially, and the spray gun moves downward along the axis. The extension of the spray gun seals the water inlet hole of the inner skeleton, and a backwashing water channel is formed between the spray gun and the lower filter screen, realizing the change of the water flow channel and achieving better filtering and backwashing effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a front view of the pre-filter in the filtering state according to the first embodiment of the present invention;

[0035] Figure 2 is a cross-sectional view of the pre-filter in the filtering state of the first embodiment of the present invention;

[0036] Figure 3 is a front view of the pre-filter in the backwashing state according to the first embodiment of the present invention;

[0037] Figure 4 is a cross-sectional view of the pre-filter in the backwashing state of the first embodiment of the present invention;

[0038] Figure 5 is an exploded view of the pre-filter of the first embodiment of the present invention;

[0039] Figure 6 is a three-dimensional diagram of a valve body according to a first embodiment of the present invention;

[0040] Figure 7 is a cross-sectional view of a valve body according to a first embodiment of the present invention;

[0041] Figure 8 is a three-dimensional diagram of the valve core assembly (excluding the sprinkler) of the first embodiment of the present invention;

[0042] Fig. 9 is a cross-sectional view of the inner frame of the first embodiment of the present invention;

[0043] Fig.10 is a three-dimensional diagram of an impeller according to Embodiment 1 of the present invention;

[0044] Fig.11 is a three-dimensional diagram of the lower filter screen of the first embodiment of the present invention;

[0045] Fig.12 is a stereoscopic diagram of a spray gun according to a first embodiment of the present invention;

[0046] Fig.13 is a three-dimensional diagram of a piston body according to a first embodiment of the present invention;

[0047] Fig.14is a three-dimensional diagram of a sprinkler according to a first embodiment of the present invention;

[0048] Fig.15 This is a schematic diagram of the connection between the exoskeleton, filter bottle, connector, valve body and housing of the first embodiment of the present invention;

[0049] Fig.16 It is an exploded view of the filter bottle, the connector, the lower cover, the valve body and the housing of the first embodiment of the present invention;

[0050] Fig.17 is an exploded view of a filter bottle, a connector, a valve body and a housing according to a first embodiment of the present invention;

[0051] Fig.18 is a stereoscopic diagram of the exoskeleton of the first embodiment of the present invention;

[0052] Fig.19 is a three-dimensional diagram of the lower cover body of the first embodiment of the present invention;

[0053] Fig. 20 is a three-dimensional diagram of the lower housing of the first embodiment of the present invention;

[0054] Fig.21 is a three-dimensional diagram of a backwashing skeleton according to the first embodiment of the present invention;

[0055] Fig. 22 3D diagram of the scraping and cleaning member of the first embodiment of the present invention

[0056] Fig.23 is a three-dimensional diagram of a pressure gauge according to a first embodiment of the present invention;

[0057] Fig.24 is a schematic diagram of the connection between the memory knob and the housing according to the first embodiment of the present invention;

[0058] Fig.25 This is a top view of the memory knob;

[0059] Fig.26 yes Fig.25 The enlarged view of point A in the middle;

[0060] Fig. 27 is a three-dimensional diagram of a turntable according to a first embodiment of the present invention;

[0061] Fig.28 is a three-dimensional diagram of a Y-shaped sealing gasket according to a first embodiment of the present invention;

[0062] Fig.29 is a stereoscopic diagram of a pre-filter equipped with a pressure-stabilizing regulating valve according to a first embodiment of the present invention;

[0063] Fig.30 is a stereoscopic diagram of a universal pre-filter according to a second embodiment of the present invention;

[0064] Fig.31 is a stereoscopic diagram of a pre-filter according to a second embodiment of the present invention;

[0065] Fig.32 It is a stereoscopic diagram of the pre-filter of the third embodiment of the present invention.

[0066] In the figure, 1, valve body; 1a, water inlet end; 1b, water outlet end; 1c, filter chamber; 1d, water measuring end of pressure gauge; 2, drain valve; 3, baffle; 4, lower cavity; 5, water outlet; 6, steel ring; 7, accommodating chamber; 71, upper cavity; 72, outer cavity; 8, valve core assembly; 81, inner frame; 811, water passing part; 812, water inlet part; 812a, water inlet end face; 82, impeller; 821, sleeve body; 822, fin; 83, lower filter screen; 83a, filter hole; 84 , spray gun; 85, piston body; 86, elastic member; 87, sprinkler; 9, memory knob; 91, recording disk; 92, turntable; 10, connector; 101, external connector; 102, internal connector; 11, shell; 111, upper shell; 1111, front cover; 1112, rear cover; 112, lower shell; 12, upper filter; 13, clean water chamber; 14, extension; 15, sewage discharge hole; 16, backwash frame; 17, channel; 18, clamping platform; 19, Card connector; 20, water spray hole; 21, water flow channel; 22, outer frame; 23, water hole; 24, filter bottle; 25, scraper; 26, outer scraper strip; 27, inner scraper strip; 28, protective shell; 29, pressure gauge; 30, protective lens; 31, voltage regulating valve; 32, AC plug; 33, controller; 34, power supply; 35, recoil seal ring; 36, connecting seal ring; 37, first seal ring; 38, second seal ring; 39, universal conversion joint; 40, convex Teeth; 41. arc-shaped groove; 42. handle; 43. convex part; 44. retaining ring; 45. special spanner; 46. drain knob; 47. elastic buckle; 48. magnet; 49. cleaning hole; 50. Y-type sealing gasket; 51. water through hole; 52. cover; 53. blind hole; 54. fastener; 55. lower cover; 56. protrusion; 57. card seat hole; 58. card; 59. sealing slope; 60. installation slope; 61. water inlet hole; 62. positioning convex part; 63. positioning groove. DETAILED DESCRIPTION

[0067] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0068] In the description of the present invention, it should be understood that the terms "center", "up", "down", "vertical", "horizontal", "top", "bottom", "inside" and "outside" used in the present invention to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0069] It should be understood that the present invention uses the terms "first", "second", etc. to describe various information, but these information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0070] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] Embodiment 1

[0072] like Figures 1 to 29 As shown, a pre-filter according to a preferred embodiment of the present invention includes a valve body 1, a shell 11, a valve core assembly 8 and a drain valve 2.

[0073] The valve body 1 is installed at the top of the shell 11, and the valve core assembly 8 and the drain valve 2 are installed in the shell 11 from top to bottom. A water inlet end 1a is provided at one end of the valve body 1, and a water outlet end 1b is provided at the other end of the valve body 1, that is, the water inlet end 1a and the water outlet end 1b are arranged opposite to each other and are located on the same horizontal line. In other embodiments, the water inlet and outlet ends 1a and the water outlet ends 1b may not be on the same horizontal line, or the water inlet and outlet ends 1a may be arranged obliquely, but are not limited to this example. The ends of the water inlet end 1a and the water outlet end 1b may be provided with installation positions for connecting pipes. The valve body 1 is provided with a filter chamber 1c, and the two ends of the filter chamber 1c are respectively connected to the water inlet end 1a and the water outlet end 1b. A baffle 3 extends downward from the top side of the inner wall of the filter chamber 1c, and the baffle 3 is vertically arranged on the side close to the water inlet end 1a.

[0074] The drain outlet of the drain valve 2 is connected to the floor drain, and the drain valve 2 can be a drain ball valve. The lower end of the drain valve 2 is threadedly connected with a fastener 54, which can be connected to an external hose through a drain pipe quick plug assembly, so that the impurities discharged by the drain valve 2 are discharged into the sewer.

[0075] The valve core assembly 8 is equivalent to the filter element of the existing filter device. The valve core assembly 8 includes an inner frame 81, an impeller 82, a lower filter screen 83, a spray gun 84, a piston body 85 and an elastic member 86.

[0076] The inner frame 81 is fixedly installed in the housing 11. Fig. 9 As shown, a water inlet hole 61 is provided on the top side of the inner frame 81. In this embodiment, there are four water inlet holes 61, which are equally spaced around the central axis of the inner frame 81. A water through hole 51 is provided on the outer peripheral side of the inner frame 81. In this embodiment, there are a plurality of water through holes 51, which are evenly distributed on the outer periphery of the inner frame 81.

[0077] The impeller 82 is horizontally disposed below the water inlet 61 and is rotatably mounted outside the inner frame 81 . The impeller 82 can rotate 360° around the inner frame 81 .

[0078] like Fig.11 As shown, the lower filter screen 83 is a hollow cylindrical structure, and a steel ring 6 is provided at the upper and lower ends thereof, which can not only increase the strength of the entire lower filter screen 83, but also facilitate the disassembly and assembly of the lower filter screen 83, and realize repeated disassembly and assembly. The outer periphery of the lower filter screen 83 is provided with a plurality of filter holes 83a, and 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. The lower filter screen 83 is sleeved and tightly attached to the outer periphery of the inner frame 81, and a receiving chamber 7 is formed between the lower filter screen 83 and the shell 11, and the receiving chamber 7 is respectively connected to the water inlet hole 61 and the filter hole 83a in the lower filter screen 83.

[0079] The spray gun 84 is vertically mounted in the inner frame 81 and can move up and down in the inner frame 81. Fig.12As shown, the spray gun 84 is a structure that is larger at the top and smaller at the bottom, and the spray gun 84 can be divided into an upper part, a middle part and a lower part. The upper and lower parts of the spray gun 84 are both cylindrical in shape, 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 a transition structure from the upper part with a large outer diameter to the lower part with a small outer diameter, and the longitudinal section of the middle part of the spray gun 84 is an isosceles trapezoid. The upper part of the spray gun 84 is provided with an extension portion 14 along its radial direction, and the extension portion 14 is an annular sheet structure protruding from the outer surface of the spray gun 84 and arranged horizontally. The upper part of the spray gun 84 is sleeved with an upper filter screen 12, which is arranged above the extension portion 14, and the upper part of the upper filter screen 12 is connected to the bottom side of the baffle 3, and the spray gun 84 can move up and down in the inner frame 81 and the upper filter screen 12. The spray gun 84 is vertically penetrated by a clean water chamber 13, and the upper end of the clean water chamber 13 is connected to the filter chamber 1c. The water purification chamber 13 can be divided into two parts, the upper part of the water purification 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 water purification chamber 13 corresponds to the part from the extension part 14 to the bottom end of the spray gun 84. The inner diameter of the upper part of the water purification chamber 13 is larger than the inner diameter of the lower part. The water purification chamber 13 is a stepped circular hole. The lower side of the spray gun 84 is provided with a plurality of water outlets 5, each of which is evenly distributed on the lower periphery of the spray gun 84, and the water outlets 5 are respectively connected to the filter hole 83a and the water purification chamber 13. When the spray gun 84 moves upward, the upper part of the spray gun 84 is located in the filter chamber 1c, specifically, the part from the top side of the spray gun 84 to the extension part 14 is located in the filter chamber 1c, blocking the water flow from the water inlet end 1a to the filter chamber 1c in the valve body 1. At this time, the top side of the spray gun 84 abuts against the bottom side of the baffle 3, the water inlet end 1a is connected to the water inlet hole 61, and the clean water chamber 13 is connected to the water outlet end 1b through the filter chamber 1c. When the spray gun 84 moves downward, the extension part 14 covers the top of the water inlet hole 61, preventing the water flow from the water inlet end 1a to the water inlet hole 61. At this time, the upper part of the spray gun 84 is located at the lower side of the filter chamber 1c.

[0080] like Fig.13 As shown, the piston body 85 includes three parts: 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, and the outer diameter of the middle part of the piston body 85 is larger than the outer diameter of the upper part of the piston body 85, and smaller than the outer diameter of the lower part of the piston body 85. The piston body 85 is a stepped structure. Figure 2 As shown, the upper part of the piston body 85 is provided with an internal thread, the bottom of the spray gun 84 is provided with an external thread matching the internal thread, and the piston body 85 is installed on the bottom side of the spray gun 84 through the thread. The middle and lower parts of the piston body 85 are provided with a cylindrical blind hole 53. A lower cavity 4 is formed between the piston body 85, the housing 11 and the drain valve 2, and the bottom of the lower cavity 4 is connected to the water inlet of the drain valve 2. A drain through hole 15 is provided on the bottom side of the middle part of the piston body 85, and the drain through hole 15 is respectively connected to the accommodating cavity 7 and the lower cavity 4. A guide column is provided in the blind hole 53 of the piston body 85, and an elastic member 86 is sleeved on the guide column.

[0081] The elastic member 86 is vertically arranged in the lower cavity 4, connected to the piston body 85, the top side of the elastic member 86 abuts against the upper side of the inner wall of the blind hole 53, and the bottom side of the elastic member 86 is connected to the top side of the drain valve 2. In this embodiment, the elastic member 86 is a conical spring.

[0082] In the non-working state, the drain valve 2 is closed, the elastic force of the elastic member 86 is greater than the gravity of the spray gun 84 and the piston body 85, the elastic member 86 is in an extended state, the spray gun 84 and the piston body 85 move upward under the upward elastic force of the elastic member 86, the upper part of the spray gun 84 is located in the filter chamber 1c of the valve body 1, the top side of the spray gun 84 abuts against the bottom side of the baffle 3, and the extension portion 14 is located above the water inlet end face 812a and does not contact the water inlet end face 812a.

[0083] like Figure 1 and Figure 2 As shown, when the pre-filter is in the filtering state, the drain valve 2 is still in the closed state, and the raw water enters the valve body 1 from the water inlet end 1a. The upper part of the spray gun 84 is located in the filter chamber 1c and abuts against the baffle 3, cutting off the channel for the raw water to flow from the water inlet end 1a to the filter chamber 1c and the water outlet end 1b, and the raw water flows from the water inlet end 1a through the water inlet hole 61 into the accommodating chamber 7. Since the impeller 82 is installed below the water inlet end face 812a, the water flow is affected by the pipeline pressure F1 and impacts the impeller 82, causing the impeller 82 to rotate 360° around the inner frame 81, generating centrifugal force, and the water flow passing through the impeller 82 also rotates 360° in the accommodating chamber 7 accordingly, so that the raw water is accelerated along the impeller 82 and thrown into the accommodating chamber 7, which has an accelerating effect on the raw water. At the beginning, the raw water is affected by its own gravity and stays in the lower cavity 4 from the accommodating chamber 7, 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, under the action of the pipeline pressure F1, enters the water purification chamber 13 through the multiple filter holes 83a of the lower filter screen 83 through the water outlet 5 of the spray gun 84. The filtered water flowing into the water purification chamber 13 passes through the water purification chamber 13 of the spray gun 84, flows into the filter chamber 1c, and then is discharged to the water outlet 1b, and finally flows into the lower end whole house water purification pipeline.

[0084] Open the drain valve 2 to put the pre-filter in the backwash and scrape state. Figure 3 and Figure 4As shown, the pressure F2 at the sewage outlet is less than the water inlet pressure. The pressure F2 at the sewage outlet and the pipeline 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, pressing the spray gun 84 to drive the piston body 85 to move downward, so that the tower-shaped spring is compressed and deformed. The top side of the spray gun 84 does not contact the baffle 3, and the bottom side of the extension 14 seals the water inlet hole 61. At this time, the water inlet hole 61 is not connected to the water inlet end 1a, and the water inlet end 1a is connected to the filter chamber 1c. The raw water flows from the water inlet end 1a into the filter chamber 1c. Since the water inlet end 1a and the water outlet end 1b are located on the same horizontal line, and the filter chamber 1c is connected to the water outlet end 1b and the vertically arranged clean water chamber 13 at the same time, the water flow will preferentially flow into the clean water chamber 13 due to its own gravity. Before the raw water flows into the spray gun 84, it is filtered into filtered water through the upper filter screen 12, and the impurities in the raw water are blocked by the upper filter screen 12. The filtered water flows into the clean water chamber 13 and rinses the inner side of the filter screen through the water outlet 5, flushing the dirt strongly attached to the lower filter screen 83 into the accommodating chamber 7, and then rushes into the drainage hole 15 of the piston body 85 with the water flow and is discharged into the floor drain through the drainage valve 2.

[0085] Close the drain valve 2, the pressure at the water inlet end 1a is consistent with the internal pressure of the pre-filter, the tower spring is reset, the spray gun 84 moves up, the inner frame 81 no longer covers the water inlet hole 61, and the water inlet hole 61 is opened. In this state, the filter enters the normal filtering state.

[0086] In summary, in the filtering state, the drain valve 2 is closed, the elastic sheet is in a normal extension state, the piston body 85 and the spray gun 84 are pushed upward, and the top side of the spray gun 84 is connected to the baffle 3 in the filter chamber 1c, cutting off the water flow channel that directly flows from the water inlet end 1a into the filter chamber 1c. The raw water flows into the water inlet hole 61 from the water inlet end 1a, is accelerated into the accommodating chamber 7 through the impeller 82, flows into the clean water chamber 13 through the filter hole 83a of the lower filter screen 83, and flows into the filter chamber 1c from the clean water chamber 13 and out of the water outlet end 1b. The impurities are blocked by the lower filter screen 83 in the accommodating chamber 7 and the lower filter screen 83. When the sewage valve 2 is opened, the spray gun 84 and the piston body 85 move downward along the axis under the effect of the sewage outlet pressure and the pipeline pressure, the top side of the spray gun 84 does not contact the baffle 3, the elastic member 86 shrinks, and the extension 14 covers the water inlet 61, blocking the water flow from the water inlet end 1a to the channel 17 of the water inlet 61. The raw water is filtered through the upper filter 12, and the impurities in the raw water are blocked outside the upper filter 12, preventing the dirty impurities from flowing into the clean water chamber 13, and making the impurities deposited at the bottom of the clean water chamber 13, affecting the user's water safety, and at the same time ensuring the long-term effective operation of the spray gun 84 and other structures. The filtered water flows out from the water outlet 5, washing the impurities adhering to the outside of the lower filter 83, and the impurities fall into the bottom of the accommodating chamber 7, and flow into the lower cavity 4 with the water through the sewage through hole 15, and finally discharged from the sewage valve 2.

[0087] Based on the above technical solution, the spray gun 84 can move up and down inside the upper filter 12. The upper filter 12 contacts the raw water before the spray gun 84. The dirt is isolated from the upper filter 12 and will not penetrate between the filter and the spray gun 84 like other existing products, causing the spray gun 84 to be unable to move up and down, affecting its backwashing function. The inner frame 81 is rotatably sleeved with an impeller 82. The raw water enters the accommodating chamber 7 from the water inlet 61 and impacts the impeller 82, causing the impeller 82 to rotate. At the same time, the raw water is accelerated and can quickly enter the accommodating chamber 7, impacting the impurities in the accommodating chamber 7, which can prevent the dirt from adhering to the accommodating chamber 7 for a long time and causing the lower filter 83 to be blocked, so that the device can work effectively for a long time. The pre-filter uses the different pressures in the filter when the drain valve 2 is opened or closed. By setting an elastic member 86, the upper and lower positions of the spray gun 84 in the filter chamber 1c are changed to achieve a change in the water flow channel, achieving a better filtering and backwashing effect.

[0088] Among them, the upper filter screen 12 is sleeved on the upper part of the spray gun 84 through the backwashing frame 16, and the backwashing frame 16 provides a fixed and installed position for the upper filter screen 12. The backwashing frame 16 is cylindrical in shape, and the backwashing frame 16 is sleeved on the upper part of the spray gun 84. A channel 17 for the spray gun 84 to move up and down is vertically provided in the backwashing frame 16, and 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 backwashing frame 16, and the top side of the backwashing frame 16 is sealed and connected with the bottom side of the baffle 3 through the backwashing sealing ring 35. The backwashing frame 16 is fixedly set on the top side of the inner frame 81, and the bottom side of the backwashing frame 16 and the top side of the inner frame 81 form a space for the extension part 14 of the spray gun 84 to move up and down. The side of the backwashing frame 16 is provided with a plurality of cleaning through holes 49, and the plurality of cleaning through holes 49 are evenly arranged on the backwashing frame 16. During backwashing, the raw water enters the waterway hole through the plurality of cleaning through holes 49, which is conducive to increasing the water pressure of the raw water. When the water pressure in the pipeline is relatively low, a plurality of cleaning through holes 49 are provided on the backwashing frame 16 to ensure that the water flows into the clean water chamber 13 .

[0089] Specifically, Fig.10As shown, the impeller 82 includes an annular sleeve body 821, which is sleeved on the outside of the inner frame 81. The outer side of the sleeve body 821 has at least two inclined fins 822, and the inclination of the fins 822 is 0° to 90°, and the inclination direction can be clockwise or counterclockwise. The fins 822 are inclined, so impurities are not easy to adhere to them for a long time, and the dirt deposition caused by long-term non-discharge is avoided. An inclined waterway is formed between two adjacent fins 822. The waterway has a diversion function. During filtration, multiple waterways are formed between the lower filter screen and the outer frame to evenly distribute the incoming water and guide the water flow into the accommodating cavity. The water flow hits the fins 822, driving the impeller 82 to rotate. At the same time, the impeller 82 rotates, which also causes the water flow to form a vortex. Under the dual effects of the inlet pressure and the centrifugal force, the water flow speed is increased, which is conducive to impacting the dirt deposited at the bottom of the accommodating cavity 7.

[0090] More specifically, if Fig. 9 As shown, the inner frame 81 includes a water passing portion 811, and the shape of the water passing portion 811 is cylindrical. There are several water passing holes 51, and multiple water passing holes 51 are evenly arranged on the outer peripheral side of the water passing portion 811, which are used to connect the filter hole 83a of the lower filter screen 83 and the clean water chamber 13. The sleeve body 821 is sleeved outside the water passing portion 811, and the top side of the water passing portion 811 is radially extended with a water inlet portion 812, and the top side of the water inlet portion 812 is a water inlet end face 812a, and the water inlet hole 61 is arranged on the water inlet end face 812a. When the backwash mode is turned on, the bottom side of the extension portion 14 abuts on the water inlet end face 812a and covers the water inlet hole 61. There are multiple water inlet holes 61, and multiple water inlet holes 61 are evenly arranged at equal intervals with the axis of the inner frame 81 as the center. The water-passing portion 811 has a clamping platform 18 extending radially therefrom, and the clamping platform 18 surrounds the lower portion of the water-inlet portion 812. At least two clamping pieces 19 protrude from the inner side of the sleeve body 821, and each clamping piece 19 is evenly arranged at equal intervals with the axis of the inner frame 81 as the center. The bottom side of the clamping piece 19 abuts against the top side of the clamping platform 18, so that the sleeve body 821 is clamped on the clamping platform 18, ensuring that the impeller 82 can rotate around the inner frame 81 while maintaining a connection relationship with the inner frame 81.

[0091] Preferably, the valve core assembly 8 further comprises a water sprayer 87, which is located in the inner frame 81 and rotatably sleeved on the outer periphery of the spray gun 84. The bottom side of the water sprayer 87 abuts against the top side of the piston body 85 through the cover 52. The side of the water sprayer 87 is provided with a plurality of water spray holes 20, which are connected with the filter hole 83a of the lower filter screen 83 and the clean water chamber 13. The water flow can flow from the accommodating chamber 7 through the filter hole 83a and the water spray hole 20 into the clean water chamber 13, or flow from the clean water chamber 13 into the accommodating chamber 7 in the reverse direction. The total opening area of ​​each water spray hole 20 is smaller than the cross-sectional area of ​​the top of the clean water chamber 13. In the backwashing state, the drain valve 2 is opened, and the water flow enters the water spray hole 20 from the water outlet 5 of the spray gun 84. Since the cross-sectional area of ​​the top of the clean water chamber 13 is larger than the total opening area of ​​the water spray hole 20, the water spray hole 20 plays a role of pressurization under the pipeline pressure. Under the action of water pressure, the pressure at the upper end of the water sprayer 87 is greater than the pressure at the lower end, and the internal pressure is greater than the external pressure. A pressure difference is formed between the water spray hole 20 and the clean water chamber 13, and the pressure at the outlet of the water spray hole 20 increases. When the water flows through the water spray hole 20, the pressure is increased. The water flow with increased pressure can drive the water sprayer 87 to rotate 360 ​​degrees and move up and down. The water sprayer 87 sprays the lower filter screen 83 from top to bottom and from inside to outside, achieving the effect of rotating spraying. The water flow sprayed from the water spray hole 20 washes the inner side of the lower filter screen 83, and washes the lower filter screen 83 from inside to outside, which can easily and effectively remove the dirt strongly attached to the filter screen 83, and achieve an effective backwashing effect. The water sprayer 87 can be divided into an upper part and a lower part. The upper part of the water sprayer 87 is truncated cone-shaped, and its inner wall is in contact with the upper outer wall of the spray gun 84. The water spray hole 20 is arranged at the lower part of the water sprayer 87. The upper part of the water sprayer 87 is provided with a water flow channel 21, which is located at the bottom side of the upper part of the water sprayer 87. The number of the water flow channel 21 can be multiple, and the water flow channel 21 is respectively connected with the clean water chamber 13 and the filter hole 83a. The provision of the water flow channel 21 on the water sprayer 87 is conducive to the rapid water flow after passing through the impeller 82 to rush through the water flow channel 21 into the clean water chamber 13. In the filtering state, the water flows from the lower filter screen 83 under the action of the pipeline pressure, along the upper end of the water sprayer 87 through the water flow channel 21 into the clean water chamber 13.

[0092] In addition, the pre-filter also includes an exoskeleton 22, which is installed in the shell 11, and the inner skeleton 81 and the piston body 85 are both installed in the exoskeleton 22. The exoskeleton 22 can fix the positions of the inner skeleton 81 and the piston body 85. The bottom of the exoskeleton 22 is connected to the top side of the drain valve 2, and the exoskeleton 22 divides the accommodating chamber 7 into an upper cavity 71 and an outer cavity 72. The upper cavity 71 is formed between the exoskeleton 22 and the inner skeleton 81, and the outer cavity 72 is formed between the exoskeleton 22 and the shell 11. The upper cavity 71 is connected to the water inlet hole 61 and the filter hole 83a respectively, and the drain through hole 15 is connected to the upper cavity 71 and the lower cavity 4, and the dirt is distributed at the bottom of the upper cavity 71. The impeller 82 is located above the exoskeleton 22, and the distance between the top surface of the exoskeleton 22 and the water inlet end surface 812a of the inner skeleton 81 is greater than the height of the impeller 82, so as to ensure that the impeller 82 can rotate 360°. Fig.18 As shown, the bottom of the outer frame 22 is provided with a sealing slope 59. The sealing slope 59 and the bottom of the piston body 85 are connected by a Y-shaped sealing gasket 50 (such as Fig.28 The outer frame 22 is connected to the drain valve 2 through the connector 10. The top side of the connector 10 is connected to the outer frame 22. The bottom side of the connector 10 is threadedly connected to the top side of the drain valve 2. The bottom side of the elastic member 86 abuts against the top side of the connector 10. The piston body 85, the outer frame 22 and the connector 10 form a lower cavity 4. The connector 10 is vertically penetrated by a water hole 23. The water hole 23 connects the lower cavity 4 and the water inlet of the drain valve 2. The connector 10 is used to connect the outer frame 22 and the drain 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. Figure 4 As shown, the inner connecting member 102 and the outer connecting member 101 are sealed and connected via the connecting sealing ring 36. The inner connecting member 102 is threadedly connected to the drain valve 2, the bottom side of the outer frame 22 is provided with a polygonal convex portion, and the top side of the outer connecting member 101 is provided with a polygonal hole matching therewith, and the polygonal convex portion is clamped in the polygonal hole to realize the connection between the outer connecting member 101 and the bottom side of the outer frame 22. A retaining spring groove is provided at the lower end of the outer connecting member 101, and the retaining spring 44 is inserted into the retaining spring groove, so that the outer connecting member 101 is fixed to the lower end of the filter bottle 24.

[0093] In addition, the pre-filter further comprises a filter bottle 24, which is used to protect the outer frame 22 and the valve core assembly 8, and the filter bottle 24 is installed in the outer cavity 72. Figure 4 As shown, the outer frame 22 is sealed and installed in the filter bottle 24 through the first sealing ring 37. The filter bottle 24 is detachably installed in the housing 11, and the filter bottle 24 is detachably connected to the valve body 1. The top of the filter bottle 24 is provided with an external thread, and the bottom side of the valve body 1 is provided with an internal thread. The filter bottle 24 is connected to the valve body 1 by a threaded connection. The filter bottle 24 is sealed and connected to the valve body 1 through a second sealing ring 38. Fig.17As shown, the outer periphery of the filter bottle 24 is provided with a protrusion 56. When the water quality is very poor for a long time and the pre-filter cannot be cleaned properly, the staff can use a special wrench 45 (the special wrench 45 is provided with a recessed portion that matches the protrusion 56) to unscrew or tighten the filter bottle 24 according to the instructions, and disassemble and clean the internal lower filter screen 83 and the filter bottle 24. The material of the filter bottle 24 and the housing 11 can be a transparent material. When the impeller 82 rotates, the user can observe the water inflow through the transparent filter bottle 24, and the visualization effect is better.

[0094] At least two scraping members 25 are connected to the outer frame 22, and each scraping member 25 is evenly distributed on the outer frame 22. The outer side of the scraping member 25 fits with the inner wall of the filter bottle 24, and can scrape the inner wall of the filter bottle 24 to keep the inner wall of the filter bottle 24 clean. The inner side of the scraping member 25 fits with the outer side of the lower filter screen 83, and is used to brush the lower filter screen 83 to remove stubborn dirt on the lower filter screen 83. Since the scraping member 25 is connected to the outer frame 22, the outer frame 22 is connected to the drain valve 2 through the connecting member 10, and the drain valve 2 is installed on the shell 11, therefore, rotating the shell 11 can drive the scraping member 25 to rotate in the filter bottle 24, scrape the filter bottle 24 and the lower filter screen 83, and realize the scraping function. Fig. 22 As shown, the inner side of the scraping member 25 is provided with an inner scraping strip 27 which is inclined and fits with the lower filter screen 83. The inner scraping strip 27 is inclined so that the scraped dirt has a slope to flow downward with the water flow, and at the same time, the backwashing water can rotate with the slope to form a centripetal force, increase the cleaning effect, and remove the stubborn stains of the lower filter screen 83. The outer side of the scraping member 25 is provided with an outer scraping strip 26 which is inclined and fits with the filter bottle 24. The inclination direction of the outer scraping strip 26 is the same as the inclination direction of the fin 822. When the impeller 82 rotates along the lower filter screen 83, the outer scraping strip 26 which has the same inclination angle as the fin 822 of the impeller 82 will not affect the rotation direction of the water flow. At the same time, the scraped dirt flows down on the outer scraping strip with the water flow, and is discharged into the drain valve 2 along the drain through hole 15, which has a better drain effect and can also keep the outer scraping strip 26 clean. In this embodiment, the inclination angles of the outer scraping strip 26 and the inner scraping strip 27 are 0° to 90°.

[0095] Alternatively, if Fig.17 As shown, the shell 11 includes an upper shell 111 and a lower shell 112 detachably connected to the upper shell 111, and the detachable connection can be achieved by means of snap connection or the like. In other embodiments, the upper shell 111 and the lower shell 112 can also be connected by other means, not limited to this example. The outer frame 22 and the filter bottle 24 are both installed in the upper shell 111, the drain valve 2 and the connecting piece 10 are fixedly installed in the lower shell 112, and the drain valve 2 can be installed in the lower shell 112 by screw connection. Rotating the lower shell 112 can drive the scraping member 25 on the outer frame 22 to scrape the filter bottle 24 and the lower filter screen 83. As shown Fig. 20 As shown, the lower shell 112 is provided with a card seat hole 57. The lower shell 112 is provided with a lower cover 55, as shown in FIG. Fig.19 As shown, the lower cover 55 is provided with a card 58, and the lower cover 55 is connected to the card seat hole 57 through the card 58 to achieve connection with the lower shell 112. The upper end of the lower cover 55 supports the bottom side of the filter bottle 24 to ensure that the filter bottle 24 is set vertically. The lower cover 55 is provided with a mounting inclined surface 60 that is positioned and matched with the bottom plate of the external connecting member 101 to ensure that the connecting member 10 is connected to the lower cover 55. Fig.17 As shown, the upper shell 111 includes a front cover 1111 and a rear cover 1112, and the front cover 1111 and the rear cover 1112 are detachably connected. A magnet 48 is fixedly connected to the rear cover 1112, and a magnetic metal piece or a magnet having a magnetic opposite magnetic property to the magnet 48 is provided on the front cover 1111. A positioning protrusion 62 is provided on the surface of the front cover 1111, and a positioning groove 63 cooperating with the positioning protrusion 62 is provided on the rear cover 1112. The front cover 1111 and the rear cover 1112 are connected by magnetic attraction. At the same time, the positioning protrusion 62 is inserted into the positioning groove 63 to realize the detachable connection between the front cover 1111 and the rear cover 1112. The front cover 1111 and the rear cover 1112 are connected by magnetic attraction, so that the user can easily open the filter and simply install it back. When the filter element assembly needs to be cleaned regularly, the lower housing 112 is rotated so that the scraping member 25 scrapes the filter bottle 24 and the lower filter screen 83. The front cover 1111 and the rear cover 1112 are removed, the filter bottle 24 is unscrewed with a special wrench 45, the valve core assembly 8 is taken out, and the lower filter screen 83 is scrubbed with a brush to remove the deposited, stubborn, and strongly attached dirt on the lower filter screen 83 due to long-term non-cleaning or poor water quality, which can not only completely remove the dirt, but also enhance the product life. Since the upper filter screen 12 is only sleeved on the backwashing frame 16, after the filter bottle 24 is removed, the backwashing frame 16 can be removed from the inner frame 81, and the upper filter screen 12 can be removed for cleaning. When the user must install it outdoors and exposed to light, since the shell 11 is light-transmitting, it is easy for algae to grow in the inner cavity of the transparent filter bottle 24, affecting the water quality and the performance of the pre-filter. Therefore, an anti-light-transmitting material is sprayed on the inner wall of the shell 11 or an anti-light-transmitting film is pasted to solve the problem that the pre-filter must be installed outdoors and is prone to algae growth. The pre-filter provided by the present invention is not limited by the environment and can be installed indoors or outdoors.

[0096] More preferably, if Figure 1 As shown, a protective shell 28 is provided outside the valve body 1, and the protective shell 28 is used to protect the valve body 1 from external factors and ensure that the valve body 1 can work normally. The bottom side of the protective shell 28 is connected to the upper shell 111. A pressure gauge 29 (see Fig.23 ),like Figure 6As shown, the valve body 1 is also provided with a pressure gauge water testing end 1d, which is connected to the pressure gauge 29. The pressure gauge testing end 1d is provided with a pressure gauge hole for installing the pressure gauge 29. The pressure gauge 29 is embedded in the pressure gauge hole, which can achieve visual and real-time pressure monitoring. The user can understand the pressure in the pre-filter from the change of the pressure value displayed by the pressure gauge 29. A protective lens 30 is installed on the protective shell 28, and the protective lens 30 corresponds to the position of the pressure gauge 29. The protective shell and the protective lens 30 cover the pressure gauge 29, effectively protecting the pressure gauge 29 from external force damage.

[0097] Furthermore, the protective shell 28 is provided with a memory knob 9, which is convenient for the user to record the next corresponding cleaning time and serves as a reminder. The memory knob 9 includes a recording disk 91 and a turntable 92. The cross-sectional shapes of the recording disk 91 and the turntable 92 are both circular, and the recording disk 91 is connected to the top side of the protective shell 28 body 6. The recording disk 91 is provided with a card hole for the turntable 92 to be inserted. The upper surface of the recording disk 91 is written with numbers 1 to 12 in a clockwise direction around the card hole. Fig. 27 As shown, at least two elastic buckles 47 are provided on the bottom side of the turntable 92, and the material of the elastic buckles 47 is plastic. The elastic buckles 47 are sheet-like structures inclined toward the outside of the turntable 92, and each elastic buckle 47 is surrounded to form 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 downward so that the turntable 92 is clamped into the clamping hole. At this time, the elastic buckles 47 are forced to press against the clamping hole, so that the turntable 92 is clamped in the recording disk 91 and is rotatably connected to the recording disk 91. In this embodiment, as shown in FIG. Fig.26 As shown, the periphery of the turntable 92 is provided with a convex tooth 40, and the inner wall of the clamping hole of the recording disk 91 is provided with a plurality of arc-shaped grooves 41 that cooperate with the convex teeth 40, and there is a gap between the convex teeth 40 and the arc-shaped grooves 41. The turntable 92 is provided with a handle 42, and one end of the handle 42 is provided with a convex portion 43. The handle 42 is turned so that the convex teeth 40 rotate between the arc-shaped grooves 41, and the number on the recording disk 91 pointed to by the convex portion 43 of the handle 42 is the corresponding cleaning month. For example, after the user cleans the pre-filter on January 15, the turntable 92 is turned so that the convex portion 43 corresponds to the middle position between 1 and 2, and the user is recorded to have cleaned it in mid-January. According to the use requirements, the filter needs to be cleaned once a month, that is, the user can be reminded to clean it around February 15, and the user can also check the last cleaning time at any time in the subsequent dates. The user can record the cleaning time by turning the turntable 92 every time after cleaning, which is convenient and easy to use, and can remind the user to clean the water in time.

[0098] Preferably, Fig.29 As shown, a pressure-stabilizing regulating valve 31 is provided on the valve body 1, which can regulate the water pressure of raw water flowing from the pipeline into the water inlet end 1a.

[0099] In addition, the pre-filter further includes a drain knob 46, which is connected to the drain valve 2, specifically by screws or U-shaped retaining rings. The drain knob 46 is rotatably connected to the outside of the housing 11. Rotating the drain knob 46 can control the closing of the drain valve 2.

[0100] It is worth mentioning that the parts material of the pre-filter is low-lead brass, such as the brass in the patents with publication numbers CN104032176A or CN104004941A or CN106103755A. Through modified low-lead technology and copper surface lead removal treatment technology, the lead precipitation content of the product is greatly reduced, and the lead heavy metal precipitation content is much lower than the national standard, thereby eliminating secondary pollution of heavy metals and truly achieving healthy drinking water for users.

[0101] Embodiment 2

[0102] See also Fig.30 and Fig.31 The difference between this embodiment and the first embodiment is that the pre-filter in the second embodiment includes a controller 33 and a power supply 34, both of which are installed outside the housing 11, the power supply 34 is electrically connected to the controller 33, and the controller 33 is electrically connected to the drain valve 2. The power supply 34 can be a lithium battery or other battery to provide energy for the controller 33, and the controller 33 can be a PLC controller 33. The controller 33 controls the drain valve 2 to close, and there is no need to manually open or close the drain valve 2, so that the drain valve 2 can be opened or closed automatically.

[0103] like Fig.30 As shown, the pre-filter can be a universal pre-filter. A universal conversion joint 39 is installed on the valve body 1, which is convenient for the staff to install the pre-filter in a pipeline with a complex position.

[0104] Except for the above differences, other structures of this embodiment are consistent with those in the first embodiment, and the corresponding effects and principles are also consistent, which will not be repeated here.

[0105] Embodiment 3

[0106] See also Fig.32 The difference between the pre-filter in the third embodiment and the second embodiment is that the power supply is an external power supply, the lower shell 112 extends with an AC plug 32 for electrically connecting to the external power supply, and the controller 33 is integrated in the lower shell 112, saving the installation space of the pre-filter.

[0107] Except for the above differences, other structures of this embodiment are consistent with those of Embodiment 1 and Embodiment 2, and the corresponding effects and principles are also consistent, which will not be repeated here.

[0108] The working process of the present invention is as follows:

[0109] In the filtering state, the raw water enters the filter chamber 1c through the water inlet end 1a of the valve body 1, and then flows into the water channel inclined on the impeller 82 along the water inlet hole 61 in the inner frame 81. The water flow drives the impeller 82 to rotate 360° under the pipeline pressure F1 and the centripetal force, and the water channel rotated out of each water channel also rotates 360° accordingly and enters the upper cavity 71 between the lower filter screen 83 and the outer frame 22. Since each scraper 25 is evenly distributed on the outer frame 22, the inclination direction of the outer scraper strip 26 and the inner scraper strip 27 on the scraper 25 is the same as the inclination direction of the fin 822, and the rotated water channel will not be affected by the scraper 25, and the rotating water channel quickly enters the filter hole 83a on the lower filter screen 83. Among them, the aperture of the filter hole 83a is set according to the size of the impurities to be filtered. The rotating water flow can enter the inner side of the lower filter screen 83, and the impurities are blocked outside the lower filter screen 83, and are deposited on 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 channel 21 under the action of the pipeline pressure F1. It is discharged into the water outlet end 1c through the clean water chamber 13 and flows into the whole house clean water pipeline at the lower end. In this process, the sewage valve 2 is in a closed state.

[0110] When backwashing is required, when the terminal pipe components are not in working state, the drain knob 46 is turned counterclockwise, and the drain ball valve 2 is in an open state. A large pressure difference F3 is formed between the drain outlet pressure F2 and the pipeline pressure F1. Under this effect, the extension 14 of the spray gun 84 is driven by the pressure difference F3 to drive the water sprayer 87, the cover 52, the piston body 85, the Y-type sealing gasket 50 and the related sealing rings to compress the tower spring. Until the lower end surface of the extension 14 is close to the water inlet end surface 812a of the inner frame 81, the tower spring is compressed and deformed, and the Y-type sealing gasket 50 forms a seal with the sealing inclined surface 59 inside the outer frame 22. The raw water is transferred from the original filtering state to the backwashing state, and the raw water flushes the upper filter screen 12 from the filter chamber 1c, and the water flows into the clean water chamber 13 through the cleaning through hole 49 at the upper end of the backwashing frame 16. The impurities in the raw water are blocked by the upper filter screen 12, and the filtered water entering the clean water chamber 13 flows into the water sprayer 87 through the water outlet of the spray gun 84, and then the filtered water enters the water spray hole 20 on the water sprayer 87. In this state, a pressure difference in the inner cavity can be formed, and the cross-sectional area of ​​the upper end of the clean water chamber 13 is larger than the total surface area of ​​the water spray hole 20, causing the pressure at the outlet of the water spray hole 20 to increase. In this state, the water sprayer 87 will rotate 360 ​​degrees and move up and down, and the pressurized filtered water will be sprayed on the inner side of the lower filter screen 83, effectively flushing the dirt strongly attached to the lower filter screen 83 into the upper cavity 71, and then rushing into the sewage discharge through hole 15 of the piston body 31 with the water flow and discharged outside the filter through the sewage valve 2. The lower housing 112 is rotated, and the connecting member 10 drives and the outer frame 22 rotates with the lower housing 112. The outer scraping strip 26 of the scraping member 25 provided on the outer frame 22 scrapes the dirt on the inner wall of the filter bottle 24, and the inner scraping strip 27 scrapes the outer side of the lower filter screen 83, effectively removing the dirt accumulated on the lower filter screen 83. At the same time, the scraped dirt is washed into the sewage discharge through hole 15 of the piston body 31 with the water flow and discharged from the filter through the sewage discharge valve 2. In the case of sedimentation, stubbornness, and strong adhesion of dirt caused by long-term non-cleaning or poor water quality, the main water inlet valve and the terminal pipeline switch can be turned off first, the filter bottle 24 can be unscrewed with the special wrench 45 attached to the filter, the valve core assembly 8 in the filter bottle 24 can be taken out, the piston body 85 can be unscrewed, the lower filter screen 82 can be taken out downward, the stubborn dirt on the lower filter screen 82 can be brushed off with a brush, and then the lower filter screen 82 can be installed back and the filter bottle 24 can be tightened. Through multiple combined cleaning, not only the strongly attached dirt in the lower filter screen 83 can be removed, but also the strongly attached dirt on the inner wall of the filter bottle 24 can be removed.

[0111] In summary, the embodiment of the present invention provides a pre-filter, which has the following beneficial effects:

[0112] The upper filter screen of the embodiment of the present invention is arranged outside the spray gun. During backwashing, the upper end of the spray gun and the upper filter screen are exposed in the filter cavity. The raw water is filtered through the upper filter screen and then enters the spray gun for backwashing. Since the spray gun moves inside the upper filter screen, dirt will not enter between the upper filter screen and the spray gun to affect the normal operation of backwashing, and the backwashing structure can be protected to work effectively for a long time.

[0113] The inner frame is rotatably sleeved with an impeller. Raw water enters the accommodating chamber from the water inlet hole and impacts the impeller, causing the impeller to rotate. At the same time, the raw water is accelerated and can quickly enter the accommodating chamber, impacting the impurities in the accommodating chamber, which can prevent dirt from adhering to the accommodating chamber for a long time and causing the lower filter screen to be blocked, which is beneficial to prolonging the service life of the filter.

[0114] When the drain valve is opened, the pressure difference between the water inlet and the drain port causes the pressure inside the filter to be different. By setting an elastic part, the upper and lower positions of the spray gun in the filter chamber are changed, so that the valve core assembly moves axially, and the spray gun moves downward along the axis. The extended part of the spray gun seals the water inlet hole of the inner skeleton, and a backwashing water channel is formed between the spray gun and the lower filter screen, thereby realizing the change of the water flow channel and achieving better filtering and backwashing effects.

[0115] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A pre-filter, characterized in that: It includes a valve body, a shell, a valve core assembly and a drain valve, wherein the valve body is installed at the top of the shell, and the valve core assembly and the drain valve are both installed in the shell. The valve body is provided with a water inlet end, a water outlet end and a filter cavity respectively connected with the water inlet end and the water outlet end, and a baffle is extended downward from the top side of the inner wall of the filter cavity. The valve core assembly includes an inner frame, an impeller, a lower filter, a spray gun, a piston body and an elastic member. The inner frame is installed in the shell. The top side of the inner frame is provided with a water inlet hole. The side of the inner frame is provided with a water through hole. The impeller is located below the water inlet hole and is rotatably mounted outside the inner frame. The lower filter is sleeved outside the inner frame. A accommodating cavity is formed between the lower filter and the shell, and the accommodating cavity is communicated with the water inlet hole. The spray gun is vertically installed in the inner frame. An upper filter screen is sleeved on the outer side of the upper part of the gun, and the top side of the upper filter screen is connected to the bottom side of the baffle. A clean water chamber is vertically penetrated through the spray gun, and the clean water chamber is communicated with the filter chamber and the accommodating chamber respectively. The spray gun is provided with an extension portion along its radial direction, and the spray gun can move up and down in the inner skeleton and the upper filter screen. When the spray gun moves up, the top side of the spray gun abuts against the baffle, and the water inlet end is communicated with the water inlet hole. When the spray gun moves down, the extension portion covers the top of the water inlet hole. The piston body is installed on the bottom side of the spray gun, and a lower cavity is formed between the piston body, the housing and the drain valve. The bottom of the lower cavity is connected to the water inlet of the drain valve. A drain through hole is provided on the piston body, and the drain through hole is connected to the accommodating cavity and the lower cavity respectively. The elastic member is arranged in the lower cavity, and the top side of the elastic member is connected to the piston body, and the bottom side of the elastic member is connected to the top side of the drain valve. The valve core assembly also includes a water sprayer, which is located in the inner frame and rotatably sleeved on the outer periphery of the spray gun, the bottom side of the water sprayer abuts against the top side of the piston body, and the side of the water sprayer is provided with a plurality of water spray holes, the water spray holes are connected to the filter holes of the lower filter screen and the clean water chamber, the total area of ​​each of the water spray holes is smaller than the cross-sectional area of ​​the top of the clean water chamber, and a pressure difference is formed between the water spray pipe and the clean water chamber, so that the pressure-enhanced water flow drives the water sprayer to rotate 360 ​​degrees and move up and down, so as to spray and wash the lower filter screen from the inside to the outside; the upper part of the water sprayer is provided with a water flow channel, and the water flow channel is respectively connected to the clean water chamber and the filter hole; A protective shell is provided on the outside of the valve body, and the protective shell is connected to the top side of the shell body. A memory knob is provided on the protective shell, and the memory knob includes a recording disk and a turntable. The recording disk is connected to the top side of the protective shell, and the turntable is rotatably connected to the recording disk; convex teeth extend from the periphery of the turntable, and a plurality of arc-shaped grooves matching with the convex teeth are provided on the inner wall of the clamping hole of the recording disk, and a gap is provided between the convex teeth and the arc-shaped grooves; a handle is also provided on the turntable, and a convex portion is provided at one end of the handle, and the handle can rotate between the arc-shaped grooves, and the number set on the recording disk pointed to by the convex portion of the handle is the corresponding cleaning month.

2. The pre-filter according to claim 1, characterized in that: The upper filter is sleeved on the upper part of the spray gun through a backwashing frame, the upper filter is fixedly sleeved on the outer side of the backwashing frame, the backwashing frame is sleeved on the upper part of the spray gun, a channel for the spray gun to move up and down is vertically provided in the backwashing frame, the top side of the backwashing frame is connected to the bottom side of the baffle, the backwashing frame is arranged on the top side of the inner frame, the bottom side of the backwashing frame and the top side of the inner frame form a space for the extension part of the spray gun to move up and down, and a plurality of cleaning through holes are provided on the side of the backwashing frame.

3. The pre-filter according to claim 1, characterized in that: The impeller comprises an annular sleeve body, the sleeve body is sleeved on the outer side of the inner frame, the outer side of the sleeve body has at least two fins arranged obliquely, and an inclined water passage is formed between two adjacent fins.

4. The pre-filter according to claim 3, characterized in that: The inner skeleton includes a water passing portion, which is cylindrical in shape. The water passing hole is arranged on the side of the water passing portion. The sleeve body is sleeved outside the water passing portion. The top side of the water passing portion has a water inlet portion extending radially. The top side of the water inlet portion is a water inlet end face, and the water inlet hole is arranged on the water inlet end face.

5. The pre-filter according to claim 4, characterized in that: The water passing portion is provided with a clamping platform extending along its radial direction, and the clamping platform surrounds the lower part of the water inlet portion. At least two clamping plates are protruded from the inner side of the sleeve body, and the bottom sides of the clamping plates are in contact with the top side of the clamping platform.

6. The pre-filter according to claim 3, characterized in that: It also includes an exoskeleton, which is installed in the shell, and the inner skeleton and the piston body are both installed in the exoskeleton. The bottom of the exoskeleton is connected to the top side of the drain valve. The exoskeleton divides the accommodating cavity into an upper cavity and an outer cavity. The upper cavity is formed between the exoskeleton and the inner skeleton, and the outer cavity is formed between the exoskeleton and the shell. The upper cavity is connected to the water inlet hole and the filter hole respectively, and the drain through hole is connected to the upper cavity and the lower cavity.

7. The pre-filter according to claim 6, characterized in that: The exoskeleton is connected to the drain valve through a connecting piece, the top side of the connecting piece is connected to the exoskeleton, the bottom side of the connecting piece is connected to the top side of the drain valve, the bottom side of the elastic piece abuts against the top side of the connecting piece, the piston body, the exoskeleton and the connecting piece form the lower cavity, the connecting piece is vertically penetrated by a water hole, the water hole connects the lower cavity and the water inlet of the drain valve.

8. The pre-filter according to claim 7, characterized in that: It also includes a filter bottle, which is detachably installed in the shell, the filter bottle is detachably connected to the valve body, and the exoskeleton is installed in the filter bottle.

9. The pre-filter according to claim 8, characterized in that: At least two scraping parts are connected to the outer frame, the outer sides of the scraping parts are in contact with the inner wall of the filter bottle, and the inner sides of the scraping parts are in contact with the outer side of the lower filter screen.

10. The pre-filter according to claim 9, characterized in that: The outer side of the scraping member is provided with an inclined outer scraping strip, the outer scraping strip is in contact with the filter bottle, and the inclination direction of the outer scraping strip is the same as the inclination direction of the fin. An inner scraping strip is arranged obliquely on the inner side of the scraping member, and the inner scraping strip is fitted with the lower filter screen.

11. The pre-filter according to claim 7, characterized in that: The shell comprises an upper shell and a lower shell detachably connected to the upper shell, the outer frame is installed in the upper shell, and the drain valve and the connecting member are fixedly installed in the lower shell.

12. The pre-filter according to claim 11, characterized in that: The upper shell includes a front cover and a rear cover, and the front cover and the rear cover are detachably connected.

13. The pre-filter according to claim 1, characterized in that: A pressure gauge is installed in the protective shell, and a protective lens is installed on the protective shell, and the position of the protective lens corresponds to that of the pressure gauge.

14. The pre-filter according to any one of claims 1 to 13, characterized in that: The valve body is provided with a pressure stabilizing regulating valve.

15. The pre-filter according to any one of claims 1 to 13, characterized in that: It also includes a sewage discharge knob, which is connected to the sewage discharge valve and is rotatably connected to the outside of the shell.

16. The pre-filter according to any one of claims 1 to 13, characterized in that: It also includes a controller and a power supply, both of which are installed outside the shell, the power supply is electrically connected to the controller, and the controller is electrically connected to the drain valve.

Images