CN106823535B

CN106823535B - Front filter

Info

Publication number: CN106823535B
Application number: CN201710114897.4A
Authority: CN
Inventors: 林细勇; 何群赞; 蒋玉林; 何旺枝; 罗庆敏
Original assignee: Rifeng Enterprise Group Co Ltd; Rifeng Technology Co Ltd
Current assignee: Rifeng Enterprise Group Co Ltd; Rifeng Technology Co Ltd
Priority date: 2017-02-28
Filing date: 2017-02-28
Publication date: 2020-01-17
Anticipated expiration: 2037-02-28
Also published as: CN106823535A

Abstract

The invention relates to a pre-filter, which comprises a reversing valve, wherein the reversing valve comprises a valve core, a connecting pipe and a valve cover, the valve core comprises a valve body, a first connecting body and a second connecting body, and the first connecting body and the second connecting body are oppositely arranged and are respectively fixed on two sides of the valve body; the scraping and washing assembly comprises a cup body and a connecting piece which is rotatably arranged in the cup body, the cup body is provided with a cavity communicated with the through hole, and the inner wall of the cavity is provided with a convex edge; and the filter element assembly can be arranged in the cavity of the cup body, and water flow is guided to enter the filter element assembly through the rotation of the valve body to be filtered or used for cleaning the filter element assembly. This leading filter can guide rivers and filter or be used for wasing filter element group spare in getting into filter element group spare, makes the inside rivers flow direction of filter more reasonable, can be simultaneously when wasing with water from inside outside blowout of filter element group spare, make filter element group spare wash cleaner.

Description

Front filter

Technical Field

The invention relates to the technical field of pipeline water purification equipment, in particular to a pre-filter.

Background

At present, pre-filters are installed at the front end of a pipeline for filtering and purifying water. It has the following problems: the filter only has a filtering function, and the filter is detached for cleaning after a pipeline is cut off during cleaning, so that the operation is complex, and the trouble and the labor are wasted; the pre-filter with scraping technology has certain scraping function, but because impurity permeates into the filter core component hole of the filter screen, the filter core component hole can not be thoroughly scraped and washed, so that bacteria are bred. If the filter core component needs to be cleaned, the pipeline still needs to be cut off to disassemble and wash the filter core component of the filter screen.

Disclosure of Invention

Accordingly, there is a need for a pre-filter that can be cleaned without cutting off the line when cleaning the filter.

The technical scheme is as follows:

a pre-filter comprises a reversing valve, wherein the reversing valve comprises a valve core, a connecting pipe and a valve cover, the valve core comprises a valve body, a first connecting body and a second connecting body, the first connecting body and the second connecting body are oppositely arranged and are respectively fixed on two sides of the valve body, the valve body is provided with a first inlet and a first outlet and a matching bulge protruding towards the length direction of the valve body, the first connecting body is provided with a second inlet and a second outlet, and a first channel which is respectively communicated with the first inlet and the second inlet is arranged between the valve body and the first connecting body; the connecting pipe is provided with an accommodating cavity, a first connecting hole, a second connecting hole, a third connecting hole and a fourth connecting hole which are respectively communicated with the accommodating cavity, the first connecting hole and the second connecting hole are oppositely arranged at two ends of the connecting pipe, the third connecting hole and the fourth connecting hole are oppositely arranged at the peripheral side of the connecting pipe, the valve body is rotatably arranged in the accommodating cavity, the first connecting body is in sealing fit with the inner side wall of the first connecting hole, and the inner side wall of the first connecting hole is provided with a limit bulge which is in limit fit with the matching bulge, the second connecting body is in sealing fit with the valve cover, the free end of the second connecting body is arranged outside the valve body, the valve cover is in sealing fit with the inner side wall of the second connecting hole, the valve core is arranged in the connecting pipe, and a through hole which is arranged at an interval with the first connecting hole is formed in the inner wall of the accommodating cavity; the reversing valve further comprises a first joint and a second joint, the first joint is in threaded connection and matching with the third connecting hole, the outer wall of the first joint is in sealing connection with the connecting pipe through the third connecting hole, the second joint is in threaded connection and matching with the fourth connecting hole, the outer wall of the second joint is in sealing connection with the connecting pipe through the fourth connecting hole, and the inner end part of the first joint and the inner end part of the second joint are respectively provided with a sealing gasket and are mutually matched to form a sealing part in sealing matching with the outer wall of the valve body; the scraping and washing assembly comprises a cup body and a connecting piece which is rotatably arranged in the cup body, the cup body is provided with a cavity communicated with the through hole, the inner wall of the cavity is provided with a convex edge, one end of the cup body is connected with the connecting pipe, the other end of the cup body is also provided with a first mounting hole, the connecting piece is in sealing fit with the first mounting hole, one end of the connecting piece is provided with a switch valve, and the connecting piece is provided with a third channel communicated with the cavity; and a filter element assembly which can be arranged in the cavity of the cup body.

When the preposed filter is used, the switch valve is closed, the second connecting body is rotated to enable the valve body to be positioned at the first position, the first inlet/outlet is in butt joint with the fourth connecting hole, water flows into the accommodating cavity from the third connecting hole and flows into the filter through the through hole for filtering, and filtered water or water flowing out of other equipment enters the second inlet/outlet and flows into the fourth connecting hole from the first inlet/outlet through the first channel; when the filter element assembly needs to be scraped and washed, the second connecting body is rotated to enable the valve body to be located at the second position, the first inlet and the first outlet are in butt joint with the third connecting hole, meanwhile, the connecting piece is rotated to enable the filter element assembly to be in scraping and washing fit with the convex edge on the cup body, and sundries and the like on the outer wall of the filter element assembly are scraped and washed; and then the switch valve is opened, water flows into the first channel from the third connecting hole through the first inlet and outlet, flows into the filter element assembly of the filter from the second inlet and outlet, and seeps outwards through the inside of the filter element assembly, so that impurities on the outer wall of the filter element assembly can be washed away. The pre-filter can guide water flow to enter the first inlet and outlet to be in butt joint with the third connecting hole or the fourth connecting hole; when filter element group spare is washd to needs, can guide rivers to get into and filter or be used for wasing filter element group spare in the filter element group spare, make the inside rivers flow direction of filter more reasonable, can be simultaneously when wasing with water from inside outside blowout of filter element group spare, make filter element group spare wash cleaner.

The technical solution is further explained below:

in one embodiment, the outer wall of the filter element assembly is matched with the convex edge in a scraping and washing way, one end of the filter element assembly is matched with the inner side wall of the first connecting hole of the connecting pipe in a sealing way and is communicated with the fourth inlet and outlet, and the other end of the filter element assembly is fixed at the other end of the connecting piece.

In one embodiment, the valve body is further provided with a third inlet and outlet and a fourth inlet and outlet, the third inlet and outlet is arranged opposite to the first inlet and outlet, a second channel communicated with the third inlet and outlet is further arranged between the inner side wall of the first channel and the outer wall of the valve body, the second channel is not communicated with the first channel, and the fourth inlet and outlet is communicated with the third inlet and outlet through the second channel.

In one embodiment, the connecting pipe further comprises a first joint and a second joint, wherein the outer wall of the first joint is connected with the connecting pipe in a sealing manner through the third connecting hole, and the outer wall of the second joint is connected with the connecting pipe in a sealing manner through the fourth connecting hole; the inner end part of the first joint and the inner end part of the second joint are respectively provided with a sealing gasket and are matched with each other to form a sealing part which is in sealing fit with the outer wall of the valve body.

In one embodiment, the inner side wall of one end of the first connecting hole is in sealing fit with the first connecting body, and the other end of the first connecting hole is provided with a sleeve part in sealing fit with the filter element assembly.

In one embodiment, a fifth connecting hole in sealing fit with the cup body is further arranged between the outer wall of the sleeve joint part and the outer wall of the connecting pipe, and the through hole is arranged between the inner wall of the fifth connecting hole and the outer wall of the sleeve joint part.

In one embodiment, the protruding edges extend along the length direction of the cup body, and the protruding edges are at least two and are arranged at intervals along the peripheral side of the cup body.

In one embodiment, the end of the connecting piece is provided with a clamping body protruding outwards, and the filter element assembly is provided with a clamping hole in snap fit with the clamping body.

In one embodiment, the number of the card bodies is at least two, the card bodies are arranged at intervals along the edge of the end part of the connecting piece, and a gap is formed between every two adjacent card bodies; the connecting piece is also provided with a groove which is concave downwards, the groove is communicated with the third channel, and when the filter element assembly is fixed with the connecting piece, a gap is formed between the notch and the filter element assembly.

In one embodiment, the scraping and washing assembly further comprises a scraping and washing hand wheel, the scraping and washing hand wheel is fixedly sleeved with the connecting piece, and the scraping and washing hand wheel is further provided with a second mounting hole matched with the outer wall of the cup body in a sleeved mode.

In one embodiment, the circumferential side of the valve body is cylindrical, and the cylindrical edge is provided with a rounded corner, and the first inlet/outlet and the third inlet/outlet are arranged at intervals on the circumferential side of the valve body and between the first connecting body and the second connecting body.

Drawings

FIG. 1 is a schematic view of a first embodiment of a pre-filter according to the present invention;

FIG. 2 is a schematic view of a second embodiment of a pre-filter according to the present invention;

FIG. 3 is an exploded view of a pre-filter according to the present invention;

FIG. 4 is a schematic view of a cup according to the present invention;

FIG. 5 is a schematic view of a connector according to the present invention;

FIG. 6 is a schematic view of the assembly of the reversing valve of the present invention;

FIG. 7 is a schematic view of the valve body of the present invention in a first position;

FIG. 8 is a schematic view of the valve body of the present invention in a second position;

FIG. 9 is a schematic structural view of a connecting tube according to the present invention;

FIG. 10 is a schematic cross-sectional view of a connecting tube according to the present invention;

FIG. 11 is a first schematic cross-sectional view of the valve cartridge of the present invention;

FIG. 12 is a second schematic cross-sectional view of the valve cartridge of the present invention;

fig. 13 is a schematic structural view of a pre-filter according to the present invention.

Description of reference numerals:

10. the reversing valve comprises a 100, a valve core, 110, a valve body, 111, a first channel, 112, a first inlet/outlet, 113, a third inlet/outlet, 114, a fourth inlet/outlet, 115, a second channel, 116, a matching part, 120, a first connecting body, 122, a second inlet/outlet, 124, a first annular groove, 126, a matching protrusion, 130, a second connecting body, 132, a second annular groove, 134, a force application part, 200, a connecting pipe, 210, a containing cavity, 220, a first connecting hole, 224, a sleeving part, 226, a limiting protrusion, 230, a second connecting hole, 240, a third connecting hole, 250, a fourth connecting hole, 260, a through hole, 270, a fifth connecting hole, 300, a valve cover, 310, a third mounting hole, 400, a first joint, 500, a second joint, 502, a sealing part, 600, a sealing gasket, 20, a scraping and washing assembly, 22, a cup body, 22a cavity, 22b, a flange, 22c and a first mounting hole, 24. the filter comprises a connecting piece, a 24a, a switch valve, a 24b, a third channel, a 24c, a clamping body, a 24d, a notch, a 24e, a groove, a 24f, a scraping and washing hand wheel, a 30, a filter element component, a 32, a filter screen, a 34 and an inner core.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

It will be understood that when an element is referred to as being "secured to," "disposed on" or "mounted to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The particular manner in which one element is said to be "sealingly connected" to another element may be achieved by known techniques and will not be described further herein.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The terms "first," "second," "third," "fourth," and "fifth" in the present application do not denote any particular order or quantity, but rather are used to distinguish one element from another.

As shown in fig. 1 to 3 and fig. 6, the prefilter according to the present invention includes a direction valve 10, wherein the direction valve 10 includes a valve core 100, the valve core 100 includes a valve body 110, a first connecting body 120 and a second connecting body 130, the first connecting body 120 and the second connecting body 130 are disposed opposite to each other and fixed to two sides of the valve body 110 respectively; the valve body 110 is provided with a first inlet and outlet 112, the first connecting body 120 is provided with a second inlet and outlet 122, and a first channel 111 which is respectively communicated with the first inlet and outlet 112 and the second inlet and outlet 122 is arranged between the valve body 110 and the first connecting body 120; the connecting pipe 200 is provided with an accommodating cavity 210, a first connecting hole 220, a second connecting hole 230, a third connecting hole 240 and a fourth connecting hole 250 which are respectively communicated with the accommodating cavity 210, the first connecting hole 220 and the second connecting hole 230 are oppositely arranged at two ends of the connecting pipe 200, and the third connecting hole 240 and the fourth connecting hole 250 are oppositely arranged on the peripheral side of the connecting pipe 200; the valve body 110 is rotatably disposed in the accommodating chamber 210, the first connection body 120 is in sealing engagement with an inner sidewall of the first connection hole 220, the second connection body 130 is in sealing engagement with the valve cap 300, a free end of the second connection body 130 is disposed outside the valve body 110, the valve cap 300 is in sealing engagement with an inner sidewall of the second connection hole 230, and the valve cartridge 100 is installed in the connection pipe 200; the inner wall of the accommodating cavity 210 is provided with a through hole 260 spaced from the first connecting hole 220; the scraping and washing assembly 20 comprises a cup body 22 and a connecting piece 24 which is rotatably arranged in the cup body 22, the cup body 22 is provided with a cavity 22a communicated with the through hole 260, the inner wall of the cavity 22a is provided with a convex edge 22b, one end of the cup body 22 is connected with a connecting pipe, the other end of the cup body 22 is also provided with a first mounting hole 22c, the connecting piece 24 is in sealing fit with the first mounting hole 22c, one end of the connecting piece 24 is provided with a switch valve 24a, and the connecting piece 24 is provided with a third channel 24b communicated with the cavity 22 a; and a filter element assembly 30 positionable within the cavity 22a of the cup 22.

As shown in fig. 1 to 3, 7 and 8, when the pre-filter is used, the switch valve 24a is closed, and when the second connecting body 130 is rotated to make the valve body 110 located at the first position, the first inlet/outlet 112 is in butt joint with the fourth connecting hole 250, water flows into the accommodating cavity 210 from the third connecting hole 240, flows into the cup body through the through hole 260, water is filtered by the filter element assembly, and the filtered water flows into the second inlet/outlet 122, and flows into the fourth connecting hole 250 from the first inlet/outlet 112 through the first passage 111; when the filter element assembly 30 needs to be scraped, the second connecting body 130 is rotated to enable the valve body 110 to be located at the second position, at the moment, the first inlet/outlet 112 is butted with the third connecting hole 240, and meanwhile, the connecting piece 24 is rotated to enable the filter element assembly 30 to be in scraping fit with the convex edge 22b on the cup body 22, so that impurities and the like on the outer wall of the filter element assembly 30 are scraped; then the switch valve 24a is opened, the water flows into the first passage 111 from the third connecting hole 240 through the first inlet/outlet 112, flows into the filter element assembly 30 in the cup body from the second inlet/outlet 122, seeps out from the interior of the filter element assembly 30 to wash away impurities attached to the filter screen 32 and scraped impurities, and is discharged through the outlet of the switch valve 24a, thereby achieving the purpose of cleaning the filter element assembly 30. The pre-filter can guide water flow to enter the first inlet and outlet to be in butt joint with the third connecting hole or the fourth connecting hole; when filter element group spare 30 is washd to needs, can guide rivers to get into and filter or be used for wasing filter element group spare 30 in the filter element group spare 30, make the inside rivers flow direction of filter more reasonable, can outwards spout water from filter element group spare 30 inside simultaneously when wasing, make filter element group spare 30 wash cleaner, and then can reach and come abluent purpose without dismantling the filter.

As shown in fig. 1 to 3, and fig. 7, 8, 9, and 11, specifically, the outer side wall of the first port 112 is provided with a fitting portion 116 that is in sealing engagement with the gasket 600, and the fitting portion 116 is press-fitted with the gasket 600. Further, the first connection body 120 is provided with a matching protrusion 126 protruding in the length direction, the inner side wall of the first connection hole 220 is provided with a limiting protrusion 226, the matching protrusion 126 is in limiting matching with the limiting protrusion 226, and therefore the control of the rotation angle of the valve core is realized, and the first inlet/outlet 112 is conveniently butted with the third connection hole 240 or the fourth connection hole 250. The filter element assembly 30 includes a filter mesh 32 and an inner core 34.

As shown in fig. 3 to 5, in the above embodiment, the protruding ridges 22b extend in the longitudinal direction of the cup body 22, and at least two protruding ridges 22b are provided at intervals along the circumferential side of the cup body 22. Preferably, two convex edges 22b are provided in one set, and three sets of convex edges 22b are provided at intervals on the peripheral side of the cup body 22. The scraping effect is improved without causing excessive friction between the bead 22b and the outer wall of the cartridge, which would make it difficult to rotate the coupling 24.

As shown in fig. 3 to 5, in addition, the end of the connecting member 24 is provided with a clamping body 24c protruding outwards, and the filter element assembly 30 is provided with a clamping hole in snap fit with the clamping body 24c, so that the detachable connection between the connecting member 24 and the filter element assembly 30 can be realized through the snap fit of the clamping body 24c and the clamping hole, and the filter element can be replaced at a later stage. Furthermore, at least two card bodies 24c are arranged at intervals along the edge of the end part of the connecting piece 24, and a gap 24d is formed between two adjacent card bodies 24 c; the connecting member 24 is further provided with a recess 24e recessed downward, the recess 24e is communicated with the third passage 24b, and when the filter element assembly 30 is fixed to the connecting member 24, a gap is formed between the notch 24d and the filter element assembly 30. Therefore, a gap exists between the connecting piece 24 and the filter element assembly 30, so that sewage can conveniently flow into the third channel 24b from the gap, the sewage can be discharged, and the secondary pollution of the filter element caused by incomplete sewage discharge is avoided. Still further, the scraping and washing assembly 20 further comprises a scraping and washing hand wheel 24f, the scraping and washing hand wheel 24f is fixedly sleeved with the connecting piece 24, and the scraping and washing hand wheel 24f is further provided with a second mounting hole in sleeved fit with the outer wall of the cup body 22. Thereby facilitating the rotation of the connecting piece 24 and simultaneously ensuring that the cup body 22 is jointed through the second mounting hole, and leading the front filter to be more beautiful.

As shown in fig. 2, 3 and 6, in the above embodiment, the direction valve 10 further includes a first joint 400 and a second joint 500, wherein an outer wall of the first joint 400 is hermetically connected to the connection pipe 200 through a third connection hole 240, and an outer wall of the second joint 500 is hermetically connected to the connection pipe 200 through a fourth connection hole 250. Thus, the reversing valve 10 can be conveniently installed in a water supply pipeline or other equipment by being connected to the pipeline through the first joint 400 and the second joint 500 respectively; meanwhile, the connecting pipe 200 is easy to manufacture, and the production cost is reduced. Further, the inner end of the first joint 400 and the inner end of the second joint 500 are respectively provided with a gasket 600, and are engaged with each other to form a sealing portion 502 which is sealingly engaged with the outer wall of the valve body 110. Therefore, the sealing portion 502 formed by the sealing gasket 600 of the first joint 400 and the sealing gasket 600 of the second joint 500 is engaged with the outer wall of the valve body 110 in a better sealing manner, so that water flows through a predetermined path. Further, the first joint 400 is in threaded connection and fit with the third connecting hole 240, and the second joint 500 is in threaded connection and fit with the fourth connecting hole 250, so that the amount of the first joint 400 and the second joint 500 extending into the first connecting hole can be adjusted to adjust the amount of the extrusion force generated between the sealing gasket 600 and the outer wall of the valve body.

As shown in fig. 6 to 10, in addition, an inner sidewall of one end of the first connection hole 220 is in sealing fit with the first connection body 120, and a socket portion 224 is disposed at the other end of the first connection hole 220. So that the filter element assembly 30 can be communicated with the first connection hole 220 through the sealing engagement of the socket 224 and the filter element assembly 30, and further can be communicated with the second channel of the first connector 120. Further, a fifth connection hole 270 is further disposed between the outer wall of the sleeve joint portion 224 and the outer wall of the connection pipe 200, and the through hole 260 is disposed between the inner wall of the fifth connection hole 270 and the outer wall of the sleeve joint portion 224. Therefore, the bowl 22 of the filter can be installed on the reversing valve 10 through the fifth connecting hole 270, and when the valve body 110 is located at the first position, the third inlet/outlet 113 is abutted with the third connecting hole 240, and the first inlet/outlet 112 is abutted with the fourth connecting hole 250, and at this time, the water flows in and out from the third inlet/outlet into the accommodating cavity 210, and then flows in the bowl 22 from the accommodating cavity 210 through the through hole 260, so that the water flows in the filter element assembly 30 from the outer wall of the filter element assembly 30, and then flows out from the second inlet/outlet 122.

As shown in fig. 3, in the above embodiment, the valve cover 300 is provided with the third mounting hole 310 which is in sealing engagement with the second connection body 130. The valve cap 300 may pass through the free end of the second connection body 130 through the third mounting hole 310 to sealingly mount the second connection body 130 on the connection pipe 200.

As shown in fig. 2, 3, 6, 11 and 12, in the above embodiment, the valve body 110 further has a third inlet/outlet 113 and a fourth inlet/outlet 114, the third inlet/outlet 113 is disposed opposite to the first inlet/outlet 112, a second passage communicated with the third inlet/outlet 113 is further disposed between the inner side wall of the first passage 111 and the outer wall of the valve body 110, the second passage is not communicated with the first passage 111, and the fourth inlet/outlet 114 is communicated with the third inlet/outlet 113 through the second passage. Therefore, when the reversing valve 10 is used, when the valve body 110 is in the first position, the third inlet/outlet 113 is in butt joint with the third connecting hole 240, the first inlet/outlet 112 is in butt joint with the fourth connecting hole 250, water flows into the second passage from the third inlet/outlet 113, flows into the accommodating cavity 210 from the fourth inlet/outlet 114, flows into the cup body through the through hole 260, is filtered by the filter element assembly, and flows into the second inlet/outlet 122 from the filter element and flows into the fourth connecting hole 250 from the first inlet/outlet 112 through the first passage 111; when the filter element assembly 30 needs to be scraped, the second connecting body 130 is rotated to enable the valve body 110 to be located at the second position, at the moment, the first inlet/outlet 112 is butted with the third connecting hole 240, and meanwhile, the connecting piece 24 is rotated to enable the filter element assembly 30 to be in scraping fit with the convex edge 22b on the cup body 22, so that impurities and the like on the outer wall of the filter element assembly 30 are scraped; when the switch valve 24a is opened, the water flows into the first passage 111 from the first inlet/outlet 112, flows into the filter element assembly 30 in the cup body from the second inlet/outlet 122, and seeps out through the inside of the filter element assembly 30 to wash away impurities attached to the filter screen 32 and scraped impurities. Therefore, the water flow can be guided to enter the first inlet/outlet 112 or the third inlet/outlet 113, and the guiding effect on the water flow is further enhanced through the first passage 111 and the second passage, so that the flow direction of the water flow in the filter is more reasonable, and the filter element assembly 30 is cleaned more cleanly.

Preferably, the through-hole 260 is opposite the fourth port 114 when the valve body 110 is in the first position.

In the above embodiment, at least two fourth inlets/outlets 114 are provided and are respectively communicated with the third inlet/outlet 113 through the second passage. Therefore, the fourth port 114 can be disposed on the periphery of the valve body 110 as required, so as to rapidly and uniformly guide the water entering from the third port 113 to the fourth port 114 through the second channel.

In addition, the valve body 110 is cylindrical at the periphery and the cylindrical edge is provided with a fillet, so that the valve body is convenient to be matched with the sealing gasket 600 in a sealing way; the first inlet/outlet port 112 and the third inlet/outlet port 113 are disposed at intervals on the circumferential side of the valve body 110 and between the first connecting body 120 and the second connecting body 130. Therefore, the reciprocating rotary valve body 110 can be used to switch the different interfaces between the first inlet/outlet 112 and the third inlet/outlet 113, such as the third inlet/outlet 113 being connected to the water inlet pipe, the first inlet/outlet 112 being connected to the water outlet pipe, or the first inlet/outlet 112 being connected to the water inlet pipe, the third inlet/outlet 113 being connected to the water outlet pipe.

As shown in fig. 3, 11 and 12, the first connecting body 120 is provided with at least one first annular groove 124, and/or the second connecting body 130 is provided with at least one second annular groove 132. A sealing ring, preferably an O-ring, may thus be provided by the annular groove 24 e. Further, the first connecting body 120 is provided with at least two first annular grooves 124, or/and the second connecting body 130 is provided with at least two second annular grooves 132. The sealing performance of the connection between the first and

second connection bodies

120 and 130 and other pipes or connection holes is further improved.

In the above embodiment, the free end of the second connecting body 130 is provided with the force application portion 134, and the force application portion 134 can be a knob or a handle. The operator can control the second connecting body 130 to rotate back and forth.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A pre-filter, comprising:

the reversing valve comprises a valve core, a connecting pipe and a valve cover, wherein the valve core comprises a valve body, a first connecting body and a second connecting body, the first connecting body and the second connecting body are oppositely arranged and are respectively fixed on two sides of the valve body, the valve body is provided with a first inlet and a first outlet and a matching bulge protruding in the length direction of the valve body, the first connecting body is provided with a second inlet and a second outlet, and a first channel which is respectively communicated with the first inlet and the second inlet is arranged between the valve body and the first connecting body; the connecting pipe is provided with an accommodating cavity, a first connecting hole, a second connecting hole, a third connecting hole and a fourth connecting hole which are respectively communicated with the accommodating cavity, the first connecting hole and the second connecting hole are oppositely arranged at two ends of the connecting pipe, the third connecting hole and the fourth connecting hole are oppositely arranged at the peripheral side of the connecting pipe, the valve body is rotatably arranged in the accommodating cavity, the first connecting body is in sealing fit with the inner side wall of the first connecting hole, and the inner side wall of the first connecting hole is provided with a limit bulge which is in limit fit with the matching bulge, the second connecting body is in sealing fit with the valve cover, the free end of the second connecting body is arranged outside the valve body, the valve cover is in sealing fit with the inner side wall of the second connecting hole, the valve core is arranged in the connecting pipe, and a through hole which is arranged at an interval with the first connecting hole is formed in the inner wall of the accommodating cavity; the reversing valve further comprises a first joint and a second joint, the first joint is in threaded connection and matching with the third connecting hole, the outer wall of the first joint is in sealing connection with the connecting pipe through the third connecting hole, the second joint is in threaded connection and matching with the fourth connecting hole, the outer wall of the second joint is in sealing connection with the connecting pipe through the fourth connecting hole, and the inner end part of the first joint and the inner end part of the second joint are respectively provided with a sealing gasket and are mutually matched to form a sealing part in sealing matching with the outer wall of the valve body;

the scraping and washing assembly comprises a cup body and a connecting piece which is rotatably arranged in the cup body, the cup body is provided with a cavity communicated with the through hole, the inner wall of the cavity is provided with a convex edge, one end of the cup body is connected with the connecting pipe, the other end of the cup body is also provided with a first mounting hole, the connecting piece is in sealing fit with the first mounting hole, one end of the connecting piece is provided with a switch valve, and the connecting piece is provided with a third channel communicated with the cavity; and

a filter element assembly positionable within the cavity of the cup body.

2. The prefilter of claim 1 wherein said valve body further defines a third inlet and outlet opening and a fourth inlet and outlet opening, said third inlet and outlet opening being disposed opposite said first inlet and outlet opening, a second passageway being disposed between an inner wall of said first passageway and an outer wall of said valve body and communicating with said third inlet and outlet opening, said second passageway being non-communicating with said first passageway, said fourth inlet and outlet opening communicating with said third inlet and outlet opening through said second passageway.

3. The pre-filter of claim 2, further comprising a first joint and a second joint, wherein the outer wall of the first joint is hermetically connected with the connecting pipe through the third connecting hole, and the outer wall of the second joint is hermetically connected with the connecting pipe through the fourth connecting hole; the inner end part of the first joint and the inner end part of the second joint are respectively provided with a sealing gasket and are matched with each other to form a sealing part which is in sealing fit with the outer wall of the valve body.

4. The prefilter of claim 1 wherein said first connecting hole has an inner sidewall at one end in sealing engagement with said first connecting body and a socket at the other end in sealing engagement with said filter element assembly.

5. The pre-filter of claim 4, wherein a fifth connecting hole in sealing fit with the cup body is further formed between the outer wall of the sleeve joint part and the outer wall of the connecting pipe, and the through hole is formed between the inner wall of the fifth connecting hole and the outer wall of the sleeve joint part.

6. The pre-filter of claim 1, wherein the ridges extend along a length of the bowl, and the ridges are at least two and are spaced apart along a peripheral side of the bowl.

7. The pre-filter of claim 1, wherein the connector is provided at an end thereof with an outwardly projecting catch, and the filter element assembly is provided with a catch hole for snap-fitting with the catch.

8. The prefilter of claim 7 wherein said at least two card bodies are spaced apart along the edge of said end of said connector, and a gap is formed between two adjacent card bodies; the connecting piece is also provided with a groove which is concave downwards, the groove is communicated with the third channel, and when the filter element assembly is fixed with the connecting piece, a gap is formed between the notch and the filter element assembly.

9. The pre-filter of claim 1, wherein the scraping assembly further comprises a scraping hand wheel, the scraping hand wheel is fixedly sleeved with the connecting piece, and the scraping hand wheel is further provided with a second mounting hole matched with the outer wall of the cup body in a sleeved mode.

10. The prefilter of claim 2 wherein said valve body has a cylindrical periphery and rounded edges, said first and third ports being spaced circumferentially of said valve body and being disposed between said first and second connectors.