Tap water backwashing filter

Abstract

The utility model discloses a tap water backwashing filter which comprises a body, a filter cartridge and a valve body, a cavity is arranged in the body, a water inlet channel, a water outlet channel and a waste water channel are arranged on the body, the filter cartridge is arranged in the cavity, a hollow flow channel is arranged in the filter cartridge, and the valve body can enable the filter to be in a filtering state or a backwashing state. In a backwashing state, the water inlet channel is communicated with the cavity, and the waste water channel is communicated with the hollow flow channel, so that backwashing water in the cavity is backwashed into the hollow flow channel from outside to inside through the filter cartridge and is discharged from the waste water channel; the water flow velocity of the inner wall of the filter cartridge is larger than that of the outer wall of the filter cartridge, the backwashing water is provided by the water inlet channel, the backwashing water amount is enough, the backwashing effect can be remarkably improved, impurities are discharged, the user experience feeling is good, and the product practicability is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to filter technical field especially relates to a tap water backwash filter. BACKGROUND

[0002] At present, with the improvement of people's life quality, part family and business place will install water quality filter, these filters not only can purify water source, filter fine impurity etc, but also can filter and separate gravel, rust and other impurities, but after using a period of time, these gravel, rust and other impurities will accumulate and adhere on filter cartridge, cause filter cartridge's blockage and breed bacteria, also can reduce the filtering effect and slow down the water flow rate to some extent.

[0003] On the one hand, the impurity cleaning of the filter in the prior art is generally by disassembling the filter cartridge of the filter for cleaning, thus, the operation is relatively cumbersome, the user's use cost is relatively high, and the use experience is relatively poor, on the other hand, in some water purifiers with backwashing function, the backwashing effect is poor due to the non-concentration of water source pressure and the small amount of backwashing water, part of the impurities still remain on the filter screen and cannot be removed, and the internal structure of the filter is relatively complex, and switching is relatively inconvenient, which cannot meet the user's demand. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a tap water backwash filter, which aims at solving at least one of the technical problems in the prior art.

[0005] In order to achieve the above-mentioned purpose, the technical scheme of the utility model provides a tap water backwash filter, which comprises:

[0006] A body, wherein a cavity is arranged in the body, and a water inlet channel, a water outlet channel and a waste water channel are arranged on the body;

[0007] A filter cartridge, which is installed in the cavity, and a hollow flow channel is arranged in the filter cartridge;

[0008] A valve body, which is rotatably installed on the body, and the valve body can make the filter be in a filtering state or a backwashing state, in the filtering state, the water inlet channel and the hollow flow channel are communicated by the valve body, the water outlet channel and the cavity are communicated, so that the raw water in the hollow flow channel flows into the cavity after being filtered by the filter cartridge from inside to outside and is discharged from the water outlet channel, in the backwashing state, the water inlet channel and the cavity are communicated by the valve body, and the waste water channel and the hollow flow channel are communicated, so that the backwashing water in the cavity is backwashed into the hollow flow channel from outside to inside by the filter cartridge and is discharged from the waste water channel.

[0009] Further, a first fluid control surface is formed on the outer circumferential surface of the valve body, and a second fluid control surface is formed on the cavity wall where the cavity communicates with the water inlet channel, the water outlet channel and the waste water channel, the first fluid control surface and the second fluid control surface are arranged in abutment, and the first fluid control surface can cooperate with the second fluid control surface at least in a first position or a second position when the valve body is rotated, in the first position the filter is in a filtering state, and in the second position the filter is in a backwashing state.

[0010] Further, at least a first channel and a second channel are formed on the valve body, the second channel communicates with the cavity at the bottom, and the top of the filter cartridge is provided with an opening to communicate the bottom of the first channel with the hollow flow passage through the opening.

[0011] Further, a first through hole and a second through hole are formed on the first fluid control surface, the first through hole communicates with the first channel, and the second through hole communicates with the second channel, in the first position the water inlet channel communicates with the hollow flow passage through the first through hole, and in the second position the water inlet channel communicates with the cavity through the second through hole, and the waste water channel communicates with the hollow flow passage through the first through hole.

[0012] Further, the diameter of the first through hole, the diameter of the second through hole, the diameter of the water outlet channel and the diameter of the waste water channel are substantially equal.

[0013] Further, the body comprises:

[0014] a lower shell, the filter cartridge is arranged in the lower shell in a vertical direction;

[0015] an upper shell, the upper shell is detachably mounted on the lower shell to form a cavity between the upper shell and the lower shell.

[0016] Further, the upper shell is provided with a cylindrical accommodating cavity, the valve body is rotatably mounted in the accommodating cavity, and the water inlet channel and the waste water channel are respectively arranged through the side wall of the accommodating cavity to make the backwashing filter in a filtering state or a backwashing state by rotating the valve body.

[0017] Further, the valve body comprises:

[0018] a valve core, the valve core is rotatably mounted in the accommodating cavity, a connecting portion is arranged at the top of the valve core, and the top of the connecting portion penetrates out of the top of the upper shell;

[0019] a control handle, the control handle is arranged at the top of the connecting portion.

[0020] Further, the middle axis of the water inlet channel extends along a horizontal direction, the middle axis of the wastewater channel extends along a horizontal direction, and the middle axis of the wastewater channel is perpendicular to the middle axis of the water inlet channel.

[0021] Further, the inner wall of the body extends radially to form a convex wall, the convex wall is provided with a mounting platform, the mounting platforms combine to form a mounting plane, and the bottom of the filter cartridge is arranged on the mounting plane.

[0022] As can be seen from the above technical solution, the filter can be switched between the filtering state and the backwashing state by the user through the control valve body. In the filtering state, raw water enters the hollow flow channel through the water inlet channel, and the raw water is filtered from the inside of the filter cartridge to the outside of the filter cartridge. The filtered clean water is located in the cavity, and the clean water in the cavity is discharged from the water outlet channel for the user. The impurities in the raw water are retained in the hollow flow channel and the filter cartridge, and most of the impurities are attached to the inner wall of the filter cartridge. The filter can be switched to the backwashing state by the user through the control valve body. The cleaning water enters the cavity through the water inlet channel, and the cleaning water is backwashed from the outside of the filter cartridge to the inside of the filter cartridge. The backwashing water carries the impurities and is discharged from the wastewater channel. In this way, the user can conveniently and quickly switch the state of the filter. The backwashing is performed from the outside of the filter cartridge to the inside of the filter cartridge. It can be understood that the outer surface area of the filter cartridge is greater than the inner surface area of the filter cartridge. Therefore, during the flow of the backwashing water from the outside of the filter cartridge to the inside of the filter cartridge, the water pressure per unit area gradually increases. When the backwashing water reaches the inner wall of the filter cartridge, the water pressure reaches a limit value. The backwashing water is provided by the water inlet channel, so the water quantity of the backwashing is large enough. The backwashing water with large water pressure and large water quantity can effectively wash the impurities retained in the hollow flow channel and the filter cartridge, especially the impurities attached to the inner wall of the filter cartridge, thereby improving the washing efficiency. The user does not need to disassemble the filter to clean the filter cartridge, the user experience is good, and the product has strong practicability.

[0023] To make the technical concept and other purposes, advantages, features and effects of the present application more clearly understood, a preferred embodiment will be described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0024] To more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating any labor.

[0025] Figure 1 is a perspective view of the tap water backwashing filter provided by the embodiment of the present application;

[0026] Figure 2 This is a schematic diagram of the internal structure of the tap water backwash filter provided in the embodiments of this application;

[0027] Figure 3 This is an exploded view of the structure of the tap water backwash filter provided in the embodiments of this application;

[0028] Figure 4 This is an exploded view of the structure of the tap water backwash filter provided in the embodiments of this application from another perspective;

[0029] Figure 5 This is a front view of the tap water backwash filter provided in the embodiment of this application under the filtration state;

[0030] Figure 6 This is provided by the embodiments of this application. Figure 5 Sectional view at point AA;

[0031] Figure 7 This is a front view of the tap water backwash filter provided in the embodiment of this application under backwashing conditions;

[0032] Figure 8 This is provided by the embodiments of this application. Figure 7 Sectional view at point BB;

[0033] Figure 9 This is a schematic diagram of the valve body provided in this application;

[0034] Figure 10 This is a front view of the valve body provided in this application;

[0035] Figure 11 This application provides Figure 10 Sectional view at CC;

[0036] Figure 12 This is a front view of a tap water backwash filter according to another embodiment provided in this application;

[0037] Figure 13 This is a schematic diagram of the internal structure of a tap water backwash filter according to another embodiment of the present application;

[0038] The above figures include the following reference numerals:

[0039] 100. Body; 110. Cavity; 120. Water inlet channel; 130. Water outlet channel; 140. Wastewater channel; 150. Lower shell; 160. Upper shell; 161. Receiving cavity; 170. Protruding wall; 171. Mounting platform;

[0040] 200, filter cartridge; 210, hollow flow channel; 220, opening; 221, annular mounting portion; 222, first sealing ring;

[0041] 300, valve body; 310, first passage; 320, second passage; 330, valve core; 331, connecting portion; 332, second sealing ring; 340, operating handle; 350, annular convex wall;

[0042] 400, first fluid control surface; 410, first through hole; 420, second through hole;

[0043] 500, second fluid control surface;

[0044] 600, pressure relief valve. DETAILED DESCRIPTION

[0045] The self-cleaning filter for tap water provided by the embodiment of the present application at least solves one of the technical problems existing in the prior art. The filter cartridge 200 adopts a filtering mode opposite to that of the prior art. The filter cartridge 200 is filtered step by step from the inside to the outside. The reverse cleaning process of the filter cartridge 200 is also opposite to that of the prior art. The filter cartridge 200 is reversely cleaned from the outside to the inside. The outer surface area of the filter cartridge 200 is greater than the inner surface area of the filter cartridge 200. Therefore, under the same cleaning amount, the water flow speed of the inner wall of the filter cartridge 200 is greater than that of the outer wall of the filter cartridge 200 in unit area. The reverse cleaning water is provided by the water inlet channel 120. The reverse cleaning water amount is sufficient enough to significantly improve the cleaning effect of the filter cartridge 200 and the hollow flow channel 210. The impurities are discharged by the waste water channel 140. The user does not need to disassemble the filter to clean the filter cartridge 200. The user experience is better. The product has high practicability.

[0046] In order for those skilled in the art to better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0047] Please refer to Figures 1 to 11The embodiment provides a tap water backwashing filter which comprises a body 100, a filter cartridge 200 and a valve body 300, the body 100 is provided with a cavity 110, the body 100 is provided with a water inlet channel 120, a water outlet channel 130 and a waste water channel 140, the filter cartridge 200 is installed in the cavity 110, the filter cartridge 200 is provided with a hollow flow channel 210, the valve body 300 can make the filter be in a filtering state or a backwashing state, in the filtering state, the water inlet channel 120 and the hollow flow channel 210 are communicated by the valve body 300, the water outlet channel 130 and the cavity 110 are communicated, so that raw water in the hollow flow channel 210 flows into the cavity 110 after being filtered by the filter cartridge 200 from inside to outside and is discharged by the water outlet channel 130, in the backwashing state, the water inlet channel 120 and the cavity 110 are communicated and the waste water channel 140 and the hollow flow channel 210 are communicated by the valve body 300, so that backwashing water in the cavity 110 is backwashed into the hollow flow channel 210 from outside to inside by the filter cartridge 200 and is discharged by the waste water channel 140.

[0048] It can be seen that the filter of the embodiment can be switched between the filtering state and the backwashing state by controlling the valve body 300, in the filtering state, raw water enters into the hollow flow channel 210 from the water inlet channel 120, and the raw water is filtered by the filter cartridge 200 from inside to outside, the filtered clean water is located in the cavity 110, the clean water in the cavity 110 is discharged from the water outlet channel 130 to supply the user, and the impurities in the raw water are retained in the hollow flow channel 210 and the filter cartridge 200, and most of the impurities are attached to the inner wall of the filter cartridge 200, the filter can be switched to the backwashing state by controlling the valve body 300, the cleaning water enters into the cavity 110 from the water inlet channel 120, the cleaning water is backwashed by the filter cartridge 200 from outside to inside, and the backwashing water carries the impurities and is discharged from the waste water channel 140, the filter state can be conveniently and quickly switched by the user, the backwashing is performed from outside to inside of the filter cartridge 200, and it can be understood that the outer surface area of the filter cartridge 200 is greater than the inner surface area of the filter cartridge 200, so that the water pressure in a unit area gradually increases in the flow process of the backwashing water from outside to inside of the filter cartridge 200, the water pressure reaches a limit value when the backwashing water is on the inner wall of the filter cartridge 200, the water quantity of the backwashing water provided by the water inlet channel 120 is large enough, the backwashing water with large water pressure and large water quantity can effectively wash the impurities retained in the hollow flow channel 210 and the filter cartridge 200, especially the impurities attached to the inner wall of the filter cartridge 200, the washing efficiency is improved, the user does not need to disassemble the filter to clean the filter cartridge 200, the user experience is good, and the product has high practicability.

[0049] Preferably, the filter cartridge 200 is arranged as a pleated filter cartridge structure to arrange the filter cartridge 200 as a structure with an outer surface area much larger than an inner surface area, specifically, the area of the outer surface of the filter cartridge 200 is 8-30 times the area of the inner surface of the filter cartridge 200, in addition, the filter cartridge 200 can be made of pp cotton material, the pp cotton material is made of non-toxic and odorless polypropylene as raw material, the pp cotton filter cartridge 200 has uniform pore size, deep filtration structure with outer sparse and inner dense, and has high filtration efficiency and excellent characteristics of acid and alkali resistance, in other embodiments, the filter cartridge can be made of other materials, which is prior art and will not be described in detail here.

[0050] It is worth noting that in the description of the present application, backwashing refers to the opposite direction of the filter cartridge 200, that is, the filter direction of the filter cartridge 200 is opposite to the backwashing direction, that is, the filter direction of the filter cartridge 200 is from the inside to the outside of the filter cartridge 200, and the backwashing direction is from the outside to the inside of the filter cartridge 200, wherein the filter cartridge 200 is a deep filtration structure with outer sparse and inner dense, that is, the pore size of the filter hole on one side of the filter cartridge 200 close to the hollow flow channel 210 is larger than the pore size of the filter hole on the side away from the hollow flow channel 210, so that in the filtering state, the raw water is dispersed through the filter cartridge 200, and the raw water is gradually filtered from the inside to the outside of the filter cartridge 200. Although the pore size of the filter hole is gradually reduced and the filtration precision is gradually improved, the filtration rate will not be greatly affected by the gradual increase of the filtration precision due to the gradual diffusion of the raw water, which is beneficial to improve the filtration effect and improve the filtration rate, in the backwashing state, since the area of the outer surface of the filter cartridge 200 is 8-30 times the area of the inner surface, the backwashing water is gradually gathered to the hollow flow channel 210, under the same washing amount, the water flow rate per unit area of the inner surface of the filter cartridge 200 is greater than the water flow rate per unit area of the outer surface of the filter cartridge 200, and the backwashing water is continuously provided by the water inlet channel 120, so that the backwashing water can continuously backwash the filter cartridge 200 to restore the filtering state of the filter cartridge 200, without the need for multiple operations of the backwashing structure. The filter of the utility model not only improves the filtration effect and filtration rate in the filtering state, but also significantly improves the backwashing effect in the backwashing state, and the internal structure of the filter is simple, the operability is strong, the product is practical, and the user experience is good.

[0051] Preferably, the body 100 is made of transparent material, so that the user can observe the state of the filter cartridge 200 through the transparent body 100, when the filter has been filtering for a certain period of time, the filter cartridge 200 will appear different degrees of discoloration, and the user can choose whether to switch the filter to the backwashing state according to the discoloration degree of the filter cartridge 200.

[0052] Optionally, an air bag is further arranged in the cavity 110, which is used to reduce the water hammer impact on the filter, and the air bag is prior art and will not be described in detail here.

[0053] In the present embodiment, asFigures 1 to 11 As shown, the valve body 300 is rotatably installed on the body 100, the outer peripheral surface of the valve body 300 is formed with a first fluid control surface 400, a second fluid control surface 500 is formed on the cavity wall of the cavity 110 in communication with the water inlet channel 120, the water outlet channel 130 and the waste water channel 140, the first fluid control surface 400 and the second fluid control surface 500 are arranged in abutment, so that when the valve body 300 is rotated, the first fluid control surface 400 can be cooperated with the second fluid control surface 500 at least in a first position or a second position, in the first position the filter is in a filtering state, in the second position the filter is in a backwashing state, by rotating the valve body 300 to switch the first fluid control surface 400 to different positions of the second fluid control surface 500, the filter is switched between the filtering state and the backwashing state, the first fluid control surface 400 and the second fluid control surface 500 are both arranged in a curved surface, the cooperation mode of the first fluid control surface 400 and the second fluid control surface 500 is simple, which is beneficial to simplify the internal structure of the filter, so that the switching structure is simple and the state conversion between the filtering state and the backwashing state of the filter is more reliable.

[0054] Further, the valve body 300 is formed with at least a first channel 310 and a second channel 320 which are not communicated with each other, the bottom of the second channel 320 is communicated with the cavity 110, the top of the filter cartridge 200 is provided with an opening 220 to communicate the bottom of the first channel 310 with the hollow flow channel 210 through the opening 220.

[0055] Among them, the valve body 300 is a hollow cylindrical structure with an opening 220 at the bottom, the top surface in the valve body 300 is downwardly and protrusively extended to form an annular partition wall to separate the inner cavity of the valve body 300 into the first channel 310 and the second channel 320, the first channel 310 is located in the annular protruding wall 350, the second channel 320 is located outside the annular protruding wall 350, the outer peripheral surface of the opening 220 is upwardly and protrusively extended to form an annular mounting portion 221, the annular protruding wall 350 and the annular mounting portion 221 are arranged in abutment, so that the bottom of the second channel 320 is communicated with the cavity 110 and the bottom of the first channel 310 is communicated with the hollow flow channel 210, in addition, the first sealing ring 222 is further arranged between the annular protruding wall 350 and the annular mounting portion 221, so that the annular protruding wall 350 and the annular mounting portion 221 are always in sealing connection when the valve body 300 is rotated.

[0056] Further, the valve body 300 is rotatably installed on the body 100, the first fluid control surface 400 is formed with a first through hole 410 and a second through hole 420, the first through hole 410 is communicated with the first channel 310, and the second through hole 420 is communicated with the second channel 320, so that in the first position, the water inlet channel 120 is communicated with the hollow flow channel 210 through the first through hole 410, the water outlet channel 130 is communicated with the cavity 110 through the second through hole 420 and the cavity 110, or the water outlet channel 130 is directly communicated with the cavity 110, and in the second position, the water inlet channel 120 is communicated with the cavity 110 through the second through hole 420, and the waste water channel 140 is communicated with the hollow flow channel 210 through the first through hole 410.

[0057] The first through hole 410 and the second through hole 420 are both formed in the side circumferential surface of the outer wall of the valve body 300, and the valve body 300 is further provided with a communication channel, which is radially outwardly extended to the first through hole 410 by the annular protruding wall 350, so that the first through hole 410 is communicated with the first channel 310. In this way, the use of complex pipeline and valve system is avoided, the conversion between the filtering and backwashing states is clearly and reliably realized, the structure of the filter is more simple and compact, and the manufacturing cost and maintenance difficulty are reduced.

[0058] Preferably, the diameter of the first through hole 410, the diameter of the second through hole 420, the diameter of the water outlet channel 130 and the diameter of the waste water channel 140 are substantially equal.

[0059] The first through hole 410 and the second through hole 420 can be one or more, and the shape of the first through hole 410 and the second through hole 420 can be changed, and the water outlet channel 130 and the waste water channel 140 can be one or more, and such simple replacement should be within the protection scope of the utility model.

[0060] In the embodiment, as shown in Figures 1 to 4 The body 100 includes a lower shell 150 and an upper shell 160, the filter cartridge 200 is vertically arranged in the lower shell 150, and the upper shell 160 is detachably installed on the lower shell 150, so as to form the cavity 110 between the upper shell 160 and the lower shell 150.

[0061] The first through hole 410 and the second through hole 420 are both formed in the side circumferential surface of the outer wall of the valve body 300, and the valve body 300 is further provided with a communication channel, which is radially outwardly extended to the first through hole 410 by the annular protruding wall 350, so that the first through hole 410 is communicated with the first channel 310. In this way, the use of complex pipeline and valve system is avoided, the conversion between the filtering and backwashing states is clearly and reliably realized, the structure of the filter is more simple and compact, and the manufacturing cost and maintenance difficulty are reduced. Figures 1 to 11As shown, the top of the outer circumferential surface of the lower shell 150 is provided with external threads, and the bottom of the inner circumferential surface of the upper shell 160 is provided with internal threads. The upper shell 160 can be detachably mounted to the lower shell 150 by threads. When the filter cartridge 200 needs to be replaced or the inside of the filter needs to be overhauled, the upper shell 160 can be easily detached, which facilitates quick inspection of the internal components and reduces maintenance cost and difficulty. The filter cartridge 200 is vertically arranged in the lower shell 150. This layout can make full use of space and enable the filter to achieve a larger filtering area in a limited space, thereby improving filtering efficiency. At the same time, the vertically arranged filter cartridge 200 is also conducive to the natural flow of water in the filter, reduces water flow resistance, and improves the smoothness of water flow through the filter.

[0062] Preferably, as Figure 4 shown, the upper shell 160 is provided with a cylindrical accommodating cavity 161, and the valve body 300 is rotatably installed in the accommodating cavity 161. The water inlet channel 120 and the wastewater channel 140 are respectively provided through the side wall of the accommodating cavity 161, so as to communicate the water inlet channel 120 and the hollow flow channel 210 and communicate the water outlet channel 130 and the hollow cavity 110 or communicate the water inlet channel 120 and the hollow cavity 110 and communicate the wastewater channel 140 and the hollow flow channel 210 by rotating the valve body 300.

[0063] Preferably, as

[0064] shown, the upper shell 160 is provided with a cylindrical accommodating cavity 161, and the valve body 300 is rotatably installed in the accommodating cavity 161. The water inlet channel 120 and the wastewater channel 140 are respectively provided through the side wall of the accommodating cavity 161, so as to communicate the water inlet channel 120 and the hollow flow channel 210 and communicate the water outlet channel 130 and the hollow cavity 110 or communicate the water inlet channel 120 and the hollow cavity 110 and communicate the wastewater channel 140 and the hollow flow channel 210 by rotating the valve body 300. Figures 1 to 10

[0065] ​The manual operation mode is simple and operable by rotating the operating handle 340 to rotate the valve core 330. The connecting portion 331 and the operating handle are detachable structures. Specifically, a square protrusion is arranged on the top of the connecting portion 331, and a square groove is arranged on the side circumferential surface of the operating handle, so that the square protrusion is inserted into the square groove to detachably mount the operating handle on the connecting portion 331. Optionally, a second sealing ring 332 is arranged on the outer circumferential surface of the connecting portion 331 to achieve good sealing between the connecting portion 331 and the upper shell 160.

[0066] In a possible implementation mode, the electronic driving control system can be used to drive the valve core 330 to rotate.

[0067] In the embodiment, as shown in the figure, Figures 1 to 6 The valve body 300 further comprises a pressure relief valve 600 arranged on the valve core 330. One end of the pressure relief valve 600 is in communication with the external atmosphere, and the other end of the pressure relief valve 600 is in communication with the top of the body 100. The pressure relief valve 600 can control the communication between the inside of the body 100 and the external atmosphere. When the upper shell 160 is detached, the pressure relief valve 600 is controlled to relieve the pressure in the body 100. In other embodiments, the pressure relief valve 600 can also be installed at other positions, as long as the pressure relief function is achieved, and the installation position of the pressure relief valve 600 should not be regarded as a limitation of the utility model.

[0068] Preferably, the axis of the operating handle and the axis of the first through hole 410 are arranged on the same horizontal plane and are parallel to each other, that is, the extension direction of the operating handle is the same as the direction of the opening 220 of the first through hole 410. In this way, by judging the extension direction of the operating handle pointing to the water inlet channel 120 or the waste water channel 140, the state of the filter can be known, the visibility of the user is enhanced, the situation of misoperation of the user can be effectively prevented, and the practicability of the product is improved.

[0069] In the embodiment, as shown in the figure, Figures 2 to 7 The middle axis of the water inlet channel 120 extends along the horizontal direction, the middle axis of the waste water channel 140 extends along the horizontal direction, and the middle axis of the waste water channel 140 is perpendicular to the middle axis of the water inlet channel 120.

[0070] In the embodiment, the second through hole 420 is provided with two, one of which is parallel to the middle axis of the first through hole 410, and the other of which is perpendicular to the middle axis of the first through hole 410. When it is necessary to switch the state of the filter, the valve body 300 is rotated by ninety degrees in the clockwise or counterclockwise direction to complete the switching. In this way, the user operation is simple, and the switching accuracy is high.

[0071] In one possible implementation, as shown in Figures 12 to 13 the water outlet channel 130 directly communicates with the cavity 110, and the second through hole 420 is provided with one, and the central axis of the second through hole 420 is vertically arranged with the central axis of the first through hole 410, so that the valve body 300 is rotated by ninety degrees in the clockwise or counterclockwise direction to complete the switching when the state of the filter needs to be switched. Of course, the water outlet channel 130 is closed by the external valve in the backwashing state. Such an arrangement makes the user operation simple and the switching accuracy high.

[0072] In the embodiment, as shown in Figure 2 the inner wall of the body 100 extends radially to form a protruding wall 170, and the protruding wall 170 is provided with a mounting platform 171, and the mounting platforms 171 are combined to form a mounting plane. The size of the bottom of the filter cartridge 200 is substantially equal to the size of the mounting plane, and the bottom of the filter cartridge 200 is arranged on the mounting plane. In this way, the filter cartridge 200 can be effectively positioned and mounted, and the filter cartridge 200 and the lower shell 150 are coaxially arranged, thereby ensuring the stability and accuracy of the internal structure of the filter, preventing the filter cartridge 200 from being displaced during the working process, and effectively playing a filtering role. During assembly, the filter cartridge 200 can be conveniently placed on the mounting platform 171, improving the assembly efficiency and being conducive to large-scale production and application of the filter.

[0073] From the above description, it can be seen that the above-mentioned embodiments of the utility model realize the following technical effects: the user can switch the filter between the filtering state and the backwashing state through the control valve body 300, in the filtering state, the raw water enters into the hollow flow channel 210 from the water inlet channel 120, and the raw water is filtered from inside the filter cartridge 200 to outside the filter cartridge 200, the filtered clean water is located in the cavity 110, the clean water in the cavity 110 will be discharged from the water outlet channel 130 to supply the user, the impurities in the raw water will be retained in the hollow flow channel 210 and the filter cartridge 200, and the impurities attached to the inner wall of the filter cartridge 200 are the most; the user can make the filter switch to the backwashing state through the control valve body 300, the cleaning water enters into the cavity 110 from the water inlet channel 120, the cleaning water is backwashed from outside the filter cartridge 200 to inside the filter cartridge 200, and the backwashing water will carry the impurities and be discharged from the waste water channel 140; in this way, the user can conveniently and quickly switch the state of the filter, and the backwashing is performed from outside the filter cartridge 200 to inside the filter cartridge 200, it can be understood that the outer surface area of the filter cartridge 200 is greater than the inner surface area of the filter cartridge 200, so in the flow process of the backwashing water from outside the filter cartridge 200 to inside the filter cartridge 200, the water pressure in the unit area will gradually increase, the water pressure reaches a limit value when the backwashing water is on the inner wall of the filter cartridge 200, and the backwashing water is provided by the water inlet channel 120, so the water quantity of the backwashing is large enough, the backwashing water with large water pressure and large water quantity can effectively wash the impurities retained in the hollow flow channel 210 and the filter cartridge 200, especially the impurities attached to the inner wall of the filter cartridge 200, the washing efficiency is improved, the user does not need to disassemble the filter to clean the filter cartridge 200, the user experience is good, and the product has strong practicability.

[0074] It is to be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the example embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that the terms "comprise" and / or "include" as used in the specification mean the presence of features, steps, operations, devices, components and / or combinations thereof.

[0075] The application is not limited by the relative positioning of parts and steps, numerical expressions, and values set forth in these embodiments unless otherwise specifically stated. It is to be understood that the dimensions of the various parts shown in the drawings are not drawn to scale for ease of illustration. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail because such techniques, methods, and apparatus are considered to be part of the base art. In all examples shown and discussed herein, any specific value is to be interpreted as merely an example and not a limitation. Thus, other examples of the example embodiments can have different values. It is noted that like numbers and letters refer to like elements throughout the several views of the drawings, and as such, no further discussion with regard thereto is deemed necessary. In the description of the application, the terms "center", "upper", "lower", "front", "rear", "left", "right", "lateral", "longitudinal", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate relative positions or orientation based on the orientation or position shown in the drawings, and are used merely for convenience in describing the application and simplifying the description, and are not intended to indicate or imply that the referred device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.

[0076] It should be noted that, in the description of the present application, unless otherwise specifically stated and limited, the terms "set, connected, connected, installed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be in contact or integrally connected; for those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0077] It should also be noted that, unless otherwise specifically stated and limited, the terms "installation", "connection", "connection", "fixing", "setting" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0078] In addition, it should be noted that in the description of the present application, the use of "first", "second" and the like to limit parts is only for the convenience of distinguishing the corresponding parts, and unless otherwise stated, the above words have no special meaning, and therefore cannot be understood as limiting the scope of protection of the present application. In the description of the present application, unless otherwise stated, the meaning of "multiple" is two or more.

[0079] The above is the preferred embodiment of the present application, it should be noted that, for those skilled in the ordinary in the art, without departing from the principles of the present application, can make a number of improvements and refinements, these improvements and refinements also as the protection scope of the present application.

Claims

1. A tap water backwash filter characterized by, The utility model discloses a filter device, which comprises: a body provided with a cavity, a water inlet channel, a water outlet channel and a waste water channel; a filter cartridge installed in the cavity and provided with a hollow flow channel; a valve body rotatably installed on the body, which can make the filter be in a filtering state or a backwashing state, in the filtering state, the water inlet channel and the hollow flow channel are communicated through the valve body, the water outlet channel and the cavity are communicated, so that raw water in the hollow flow channel flows into the cavity and is discharged through the water outlet channel after being filtered by the filter cartridge from inside to outside, in the backwashing state, the water inlet channel and the cavity are communicated through the valve body, and the waste water channel and the hollow flow channel are communicated, so that backwashing water in the cavity is backwashed into the hollow flow channel from outside to inside through the filter cartridge and is discharged through the waste water channel.

2. The municipal water backflushing filter according to claim 1, characterized in that The outer peripheral surface of the valve body is provided with a first fluid control surface, and the cavity wall where the water inlet channel, the water outlet channel and the waste water channel are communicated is provided with a second fluid control surface, the first fluid control surface and the second fluid control surface are arranged in abutment, so that the first fluid control surface can be matched with the second fluid control surface at least in a first position or a second position when the valve body is rotated, in the first position, the filter is in the filtering state, and in the second position, the filter is in the backwashing state.

3. The municipal water backflushing filter according to claim 2, characterized in that The valve body is provided with a first channel and a second channel which are not communicated with each other, the bottom of the second channel is communicated with the cavity, and the top of the filter cartridge is provided with an opening to communicate the bottom of the first channel with the hollow flow channel through the opening.

4. The municipal water backflushing filter according to claim 3, characterized in that The first fluid control surface is provided with a first through hole and a second through hole, the first through hole is communicated with the first channel, and the second through hole is communicated with the second channel, so that in the first position, the water inlet channel is communicated with the hollow flow channel through the first through hole, and in the second position, the water inlet channel is communicated with the cavity through the second through hole, and the waste water channel is communicated with the hollow flow channel through the first through hole.

5. The municipal water backflushing filter according to claim 4, characterized in that The diameter of the first through hole, the diameter of the second through hole, the diameter of the water outlet channel and the diameter of the waste water channel are substantially equal.

6. The municipal water backflushing filter according to any one of claims 1 to 5, characterized in that The body comprises: a lower shell, the filter cartridge is arranged in the lower shell in the vertical direction; an upper shell which is detachably installed on the lower shell to form a cavity between the upper shell and the lower shell.

7. The municipal water backflushing filter according to claim 6, characterized in that The upper shell is provided with a cylindrical accommodating cavity, the valve body is rotatably installed in the accommodating cavity, and the water inlet channel and the waste water channel are respectively communicated with the side wall of the accommodating cavity, so that the backwashing filter can be in the filtering state or the backwashing state by rotating the valve body.

8. The municipal water backflushing filter according to claim 7, characterized in that The valve body comprises: a valve core which is rotatably installed in the accommodating cavity, the top of the valve core is provided with a connecting portion, and the top of the connecting portion penetrates out of the top of the upper shell; a control handle arranged on the top of the connecting portion.

9. The municipal water backflushing filter according to any one of claims 1 to 5, characterized in that The middle axis of the water inlet channel extends along a horizontal direction, the middle axis of the wastewater channel extends along a horizontal direction, and the middle axis of the wastewater channel is arranged perpendicularly to the middle axis of the water inlet channel.

10. The municipal water backflushing filter according to any one of claims 1 to 5, characterized in that The inner wall of the body extends radially to form a convex wall, the convex wall is provided with a mounting platform, the mounting platforms are combined to form a mounting plane, and the bottom of the filter cartridge is arranged on the mounting plane.

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