Automatic pollution discharge structure of prefilter with top-mounted filter bottle

Abstract

The automatic pollution discharge structure comprises a valve shell, the valve shell is provided with a raw water end, a purified water end, an upward filter bottle assembling end, a downward pollution discharge end and a valve shell cavity, the pollution discharge end is provided with a pollution discharge assembly, a flow channel switching assembly is arranged in the valve shell cavity, and the flow channel switching assembly is connected with the valve shell cavity. The flow channel switching assembly is provided with a raw water flow channel, a purified water flow channel, a pollution discharge flow channel and a backwashing water flow channel, the flow channel switching assembly is in circumferential rotating sealing connection or axial sliding sealing connection with the valve shell cavity, and the flow channel switching assembly rotates under the action of external force to achieve flow channel switching between a filtering mode and a backwashing pollution discharge mode. The filter is simple in structure and more optimized in structure, can be easily matched with an installation occasion, can realize switching of three states of filtering, pollution discharge and backwashing pollution discharge, and solves the problems of axial movement failure of the backwashing framework and synchronous opening of the pollution discharge pipe in the axial lifting process of the backwashing framework.

Description

Technical Field

[0001] The utility model relates to an automatic sewage discharge structure of a filter bottle mounted pre-filter and the pre-filter, belonging to the technical field of water purification equipment. Background Art

[0002] The mainstream pre-filter products in the prior art are of the filter bottle bottom type, including: a machine head, a filter bottle connected to the machine head at the upper end, and a drainage ball valve connected to the lower end of the filter bottle. A filter screen frame is arranged in the filter bottle, and a filter screen is arranged on the outer wall of the filter screen frame. During use, water flows into the gap between the filter bottle and the filter screen from the water inlet of the machine head, flows into the center of the filter screen frame after being filtered by the filter screen, and then flows from the center of the filter screen frame to the water outlet of the machine head. When sewage needs to be discharged, the drainage ball valve at the lower end of the filter bottle is opened to achieve it. In some installation occasions, this type of filter bottle bottom-mounted pre-filter is inconvenient to install. For this reason, the filter bottle top-mounted pre-filter is born in response to market demand. In addition to the water inlet, water outlet and filter bottle installation port, the valve head of this type of pre-filter also needs to be provided with a sewage outlet, that is, the function of the drainage ball valve originally set at the lower end of the filter bottle needs to be transferred to the valve head, so it is necessary to optimize and adjust the traditional automatic sewage discharge structure. In addition, the pre-filter in the prior art has the combined functions of filtering and backwashing. During backwashing, the principle of pressure difference is used to allow the backwashing skeleton to achieve axial movement. This method also has certain defects, that is, it is easy to fail.

[0003] In addition, the sewage discharge structure of the existing pre-filter mostly uses a sewage valve, which is opened by manually or electrically driving the sewage valve to rotate and discharge sewage, and realizes the synchronous opening of the sewage pipe during the axial lifting of the backwashing frame, which is also a solution that technicians in this field are trying to design. The utility model aims to provide a multifunctional manual and automatic pre-filter with a filter bottle on a more optimized structure and easy to match the installation occasion, which can realize the switching of the three states of filtering, sewage discharge and backwashing sewage discharge, and solves the problem of axial movement failure of the backwashing frame and synchronous opening of the sewage pipe during the axial lifting of the backwashing frame. Utility Model Content

[0004] One of the purposes of the utility model is to solve the deficiencies of the pre-filter in the prior art and to provide a multifunctional manual-automatic pre-filter mounted on a filter bottle with a more optimized structure and easy to match the installation occasion, which can realize the switching of the three states of filtering, draining and backwashing, and solves the problems of axial movement failure of the backwashing skeleton and synchronous opening of the drain pipe during the axial lifting and lowering of the backwashing skeleton.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] The automatic sewage discharge structure of the filter bottle mounted pre-filter comprises a valve housing, the valve housing is provided with a raw water end, a purified water end, an upward filter bottle assembly end, a downward sewage discharge end and a valve housing cavity, the sewage discharge end is provided with a sewage discharge assembly, a flow channel switching assembly is provided in the valve housing cavity, the flow channel switching assembly is provided with a raw water flow channel, a purified water flow channel, a sewage discharge flow channel and a backwash water flow channel, the flow channel switching assembly is circumferentially rotatingly sealed or axially slidingly sealed with the valve housing cavity, and the flow channel switching assembly rotates under the action of an external force to realize the flow channel switching between the filtering mode and the backwash sewage discharge mode;

[0007] The flow channel switching assembly is fixedly provided with a rotating lifting mechanism, which can cooperate with the backwashing frame of the pre-filter to realize the lifting and lowering of the backwashing frame during the rotation of the rotating lifting mechanism and the flow channel switching assembly; the lower end of the backwashing frame is provided with a sewage discharge switching element, which can open or close the sewage discharge end as the backwashing frame is lifted and lowered.

[0008] Preferably, the sewage discharge switching element is a ceramic valve core sealing element or a sewage discharge switching plug body made of an inert material capable of generating deformation.

[0009] Preferably, the sewage discharge switching plug body is made of rubber or silicone.

[0010] Preferably, the rotating lifting mechanism includes a fixing part, a rotating shaft part and a guide rail part with an inclination, which is fixed to the flow channel switching assembly through the fixing part and is rotatably connected to the backwash skeleton through the rotating shaft part. An adaptive guide member is also provided at the end of the backwash skeleton, and the axial adjustment of the backwash skeleton is achieved through the cooperation between the guide member and the guide rail part.

[0011] Preferably, the guide rail portion is arranged in a continuous arc shape along the circumference of the rotating lifting mechanism, and the height from the lowest point to the highest point of the guide rail portion is consistent with the maximum stroke of the axial adjustment of the backwashing skeleton.

[0012] Preferably, a limiting portion is further provided at the end of the guide rail portion, and the limiting portion is a limiting protrusion and / or an arc-shaped limiting groove.

[0013] Preferably, the flow channel switching assembly rotates under the action of external force, can close the raw water flow channel and / or the purified water flow channel, and open the backwash water flow channel, switching to the backwash mode; can open the raw water flow channel and the purified water flow channel, and close the backwash water flow channel, switching to the filtration mode.

[0014] Preferably, the channel switching component rotates 30-180° under the action of external force and switches to the backwash mode; the channel switching component rotates reversely and resets to the same angle under the action of external force and switches to the filtration mode.

[0015] The utility model realizes that in addition to setting the water inlet, water outlet and filter bottle installation port on the valve head, a sewage outlet is also set, that is, the function of the drainage ball valve originally set at the lower end of the filter bottle is transferred to the valve head, and the traditional automatic sewage discharge structure is effectively optimized and adjusted. Specifically, during filtration, the flow channel switching component is rotated to realize the connection between the raw water end and the raw water flow channel, and the connection between the purified water flow channel and the clean water end is realized; when sewage needs to be discharged, the flow channel switching component is rotated, the raw water flow channel and / or the purified water flow channel are closed, and the sewage valve is opened; when backwashing and sewage discharge are required, the backwashing water flow channel is connected with the raw water flow channel, and the impurities accumulated on the flushing valve head are flushed, and then discharged through the sewage valve.

[0016] Preferably, the filter bottle assembly end is provided with a quick-install structure assembled with the filter bottle, and the quick-install structure adopts a detachable structure, including a screw connection structure and a clamping structure. This quick-install structure is convenient for users to install, and is also convenient for replacement and maintenance of the filter bottle, or when the valve head is blocked by impurities, it is easy to disassemble and clean.

[0017] Preferably, at least one limiting portion A is provided in the valve housing cavity, and the flow channel switching assembly is provided with at least one matching limiting portion B, and the circumferential limiting or circumferential and axial synchronous limiting of the flow channel switching assembly is achieved through the cooperation of the limiting portion A and the limiting portion B. The circumferential limiting or circumferential and axial synchronous limiting is achieved through the simple cooperation of the limiting portions A\B, thereby avoiding axial misalignment of the flow channel switching assembly during circumferential rotation, and being able to conveniently determine the target position of the circumferential rotation.

[0018] More preferably, a limit portion A is provided at the upper and lower parts of the valve housing cavity, respectively, and the flow channel switching assembly is provided with two matching limit portions B, and the double limit of the flow channel switching assembly is achieved through the double cooperation of the upper and lower limit portions A and the limit portions B. The double limit is achieved through the simple cooperation of the double limit portions A\B, which avoids axial misalignment of the flow channel switching assembly during circumferential rotation, and can conveniently determine the target position of the circumferential rotation, further improving the reliability of the valve head flow channel switching.

[0019] Preferably, the limiting part A is a groove or a convex block structure, and the limiting part B is a convex block or a groove structure. This type of limiting structure is convenient for mold processing, easy to demould, and has high limiting reliability.

[0020] Preferably, the flow channel switching assembly is provided with a rotating driving member, which is a driving element extending upward along the filter bottle axial direction to the bottom of the filter bottle and connected in a rotating seal, and the flow channel switching assembly is driven by the rotation of the driving element. The utility model realizes the drive from the top of the filter bottle, can effectively drive the flow channel switching assembly, better realizes the flow channel switching function of the valve head, and has excellent practical performance.

[0021] Preferably, the driving element is a manual driving element and / or an electric driving element, so as to realize manual, automatic or manual-automatic driving rotation of the flow channel switching component and improve the application scenarios of the product.

[0022] Preferably, a sealing element is provided between the flow channel switching assembly and the valve housing cavity, and a rotating sealing connection is achieved through the cooperation of the sealing element.

[0023] The beneficial effects of the utility model are: 1) the utility model realizes that in addition to the water inlet, the water outlet and the filter bottle installation port are set on the valve head, a sewage outlet is also set, that is, the function of the drainage ball valve originally set at the lower end of the filter bottle is transferred to the valve head, which effectively optimizes and adjusts the traditional automatic sewage discharge structure. Specifically, during filtration, the flow channel switching assembly is rotated to achieve communication between the raw water end and the raw water flow channel, and communication between the purified water flow channel and the clean water end; when sewage needs to be discharged, the flow channel switching assembly is rotated to close the raw water flow channel and / or the purified water flow channel, and the sewage valve is opened; 2) Through the circumferential limit or circumferential and axial synchronous limit of the simple limit part A\B, axial misalignment of the flow channel switching assembly during circumferential rotation is avoided, and the target position of the circumferential rotation can be conveniently determined; 3) The utility model realizes the drive from the top of the filter bottle, can effectively drive the flow channel switching assembly, better realize the flow channel switching function of the valve head, and has excellent practical performance; 3) Through the cooperation of the guide rail part and the guide member, the axial adjustment of the backwashing skeleton is driven by external force, which overcomes the failure of the pressure difference principle in the prior art, and can realize the synchronous opening of the sewage pipe during the axial lifting and lowering of the backwashing skeleton. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a structural schematic diagram of the utility model;

[0026] Figure 2 yes Figure 1 A cross-sectional view of

[0027] Figure 3 yes Figure 1 Cross-sectional view (opening the raw water flow channel and the purified water flow channel);

[0028] Figure 4 yes Figure 1 Cross-sectional view (closing the raw water flow channel and the purified water flow channel);

[0029] Figure 5 It is a structural schematic diagram of the utility model;

[0030] Figure 6 It is a structural schematic diagram of the utility model.

[0031] In the figure: 1. valve housing, 11. water inlet end, 12. water outlet end, 13. filter bottle assembly end, 14. sewage discharge end, 15. valve housing cavity, 2. flow channel switching assembly, 21. raw water flow channel, 22. clean water flow channel, 23. sewage discharge flow channel, 24. backwash water flow channel, 3. limiting part A, 4. limiting part B, 5. sewage discharge seal, 6. sewage discharge valve, 7. rotating lifting mechanism, 71. fixed part, 72. rotating part, 73. guide rail part, 74. limiting part, 8. guide part, g. sewage discharge switching element. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0033] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating 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, and do not indicate or imply that the device or element referred to 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.

[0034] In the description of the utility model, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0035] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0036] like Figure 1-6As shown, the automatic sewage discharge structure of the filter bottle upper pre-filter comprises a valve housing 1, wherein the valve housing 1 is provided with a raw water end 11, a clean water end 12, an upward filter bottle assembly end 13, a downward sewage discharge end 14 and a valve housing cavity 15, wherein the sewage discharge end 14 is provided with a sewage discharge assembly, wherein a flow channel switching assembly 2 is provided in the valve housing cavity 15, wherein the flow channel switching assembly 2 is provided with a raw water flow channel 21 corresponding to the raw water end 11, a purified water flow channel 22 corresponding to the filter bottle assembly end 13 and the clean water end 12, a sewage discharge flow channel corresponding to the sewage discharge end 14, and a backwash water flow channel 24 is further provided between the raw water flow channel 21 and the purified water flow channel 22, wherein the flow channel switching assembly 2 is rotatably sealedly connected to the valve housing cavity 15, and the flow channel switching of the filtration and backwashing modes is realized when the flow channel switching assembly 2 rotates under the action of an external force;

[0037] A rotating lifting mechanism 7 is fixedly provided in the flow channel switching assembly 2, and the rotating lifting mechanism 7 can cooperate with the backwashing frame of the pre-filter, and the backwashing frame can be lifted and lowered when the rotating lifting mechanism 7 rotates with the flow channel switching assembly 2;

[0038] A sewage switching element g is provided at the lower end of the backwash skeleton. The sewage switching element g can open or close the sewage end as the backwash skeleton rises and falls. The sewage switching element g is a sewage switching plug body made of a ceramic valve core sealing element or an inert material that can produce deformation. The sewage switching plug body is made of rubber or silicone.

[0039] Specifically, the rotating lifting mechanism 7 includes a fixing portion 71, a rotating shaft portion 72 and a guide rail portion 73 with an inclination. It is fixed to the flow channel switching assembly 2 through the fixing portion 71, and is rotatably connected to the backwashing skeleton through the rotating shaft portion 72. An adaptive guide member 8 is also provided at the end of the backwashing skeleton. The axial adjustment of the backwashing skeleton is achieved through the cooperation between the guide member 8 and the guide rail portion 73.

[0040] Specifically, the guide rail portion 73 is arranged in a continuous arc shape along the circumference of the rotating lifting mechanism 7, and the height from the lowest point to the highest point of the guide rail portion 73 is consistent with the maximum stroke of the axial adjustment of the backwashing frame. A limiting portion 74 is also provided at the end of the guide rail portion 73, and the limiting portion 74 is a limiting protrusion and / or an arc-shaped limiting groove.

[0041] Specifically, the flow channel switching component 2 rotates under the action of external force, can close the raw water flow channel 21 and / or the purified water flow channel 22 (close them at the same time or close any one of them), open the drain valve 6, and enter the drain mode, and can also open the backwash water flow channel 24 at the same time and switch to the backwash drain mode; can open the raw water flow channel 21 and the purified water flow channel 22, and close the backwash water flow channel 24, and switch to the filtration mode.

[0042] In addition, the flow channel switching assembly 2 and the valve housing cavity 15 can also be axially slidably sealed in connection, and those skilled in the art can make a choice as needed.

[0043] As a specific solution that can be implemented, the flow channel switching component 2 rotates 30-180° under the action of external force, such as 30°, 45°, 60°, 90°, 120°, 180°, and 45° is selected in this embodiment to switch to the backwash mode; the flow channel switching component 2 reversely resets and rotates the same angle (45° is selected in this embodiment) under the action of external force to switch to the filtration mode.

[0044] The utility model realizes that in addition to setting the water inlet, water outlet and filter bottle installation port on the valve head, a sewage outlet is also set, that is, the function of the drainage ball valve originally set at the lower end of the filter bottle is transferred to the valve head, and the traditional automatic sewage discharge structure is effectively optimized and adjusted. Specifically, during filtering, the flow channel switching component 2 is rotated to realize the connection between the raw water end 11 and the raw water flow channel 21, and the connection between the purified water flow channel 22 and the clean water end 12; when sewage needs to be discharged, the flow channel switching component 2 is rotated, the raw water flow channel 21 and / or the purified water flow channel 22 are closed, and the sewage valve is opened; when backwashing and sewage discharge are required, the backwashing water flow channel 24 is connected with the raw water flow channel 21, and the impurities accumulated on the flushing valve head are flushed, and then discharged through the sewage valve 6.

[0045] In this embodiment, the filter bottle assembly end 13 is provided with a quick-install structure assembled with the filter bottle, and the quick-install structure adopts a detachable structure, including a screw connection structure and a clamping structure. This quick-install structure is convenient for users to install, and is also convenient for replacement and maintenance of the filter bottle, or when the valve head is blocked by impurities, it is easy to disassemble and clean.

[0046] Specifically, at least one limiting portion A3 is provided in the valve housing cavity 15, and at least one matching limiting portion B4 is provided in the flow channel switching assembly 2. The limiting portion A3 cooperates with the limiting portion B4 to achieve circumferential limiting or circumferential and axial synchronous limiting of the flow channel switching assembly 2. The circumferential limiting or circumferential and axial synchronous limiting is achieved by simply cooperating with the limiting portions A\B, thereby avoiding axial misalignment when the flow channel switching assembly 2 rotates circumferentially, and being able to conveniently determine the target position of the circumferential rotation.

[0047] More specifically, as a better alternative, a limit portion A3 is provided at the upper and lower parts of the valve housing cavity 15, and two matching limit portions B4 are provided at the flow channel switching component 2. The double axial limit of the flow channel switching component 2 is achieved through the double cooperation of the upper and lower limit portions A3 and the limit portions B4. The double limit is achieved through the simple cooperation of the double limit portions A\B, which avoids axial misalignment of the flow channel switching component 2 during circumferential rotation, and can conveniently determine the target position of the circumferential rotation, further improving the reliability of the valve head flow channel switching.

[0048] In this embodiment, the limiting portion A3 is a groove or a convex block structure, and the limiting portion B4 is a convex block or a groove structure. This type of limiting structure mold is easy to process, easy to demould, and has high reliability of limiting. The flow channel switching component 2 is provided with a rotating drive member, which is a driving element extending axially upward to the bottom of the filter bottle and rotating and sealingly connected along the filter bottle. The flow channel switching component 2 is driven by the rotation of the driving element, or the flow channel switching component 2 is linked with the sewage discharge component, and the sewage discharge component is rotationally sealed and connected to the sewage discharge end 14, and the flow channel switching component 2 is rotated by the rotation of the sewage discharge component. The utility model designs two different rotating drive members, which respectively realize the drive from the top of the filter bottle or the drive from the sewage discharge end. The specific processing can be selected according to the needs. Both can effectively drive the flow channel switching component, better realize the flow channel switching function of the valve head, and have excellent practical performance.

[0049] In this embodiment, the flow channel switching component 2 is linked with the sewage discharge component, the sewage discharge component includes a sewage discharge seal 5 and a sewage discharge valve 6, the sewage discharge seal 5 is connected to the sewage discharge end 14 in a rotational sealing manner, the sewage discharge valve 6 is fixedly connected to the sewage discharge seal 5, and the driving element is a manual driving element and / or an electric driving element. The manual, automatic or manual-automatic driving rotation of the flow channel switching component 2 is realized, and the application scenario of the product is improved. A sealing element is provided between the flow channel switching component 2 and the valve housing cavity 15, and a rotational sealing or axial sealing connection is realized through the cooperation of the sealing element.

[0050] The beneficial effects of the utility model are: 1) the utility model realizes that in addition to the water inlet, the water outlet and the filter bottle installation port are set on the valve head, a sewage outlet is also set, that is, the function of the drainage ball valve originally set at the lower end of the filter bottle is transferred to the valve head, which effectively optimizes and adjusts the traditional automatic sewage discharge structure. Specifically, during filtration, the flow channel switching assembly is rotated to realize the connection between the raw water end and the raw water flow channel, and the connection between the purified water flow channel and the clean water end; when sewage needs to be discharged, the flow channel switching assembly is rotated to close the raw water flow channel and / or the purified water flow channel, and the sewage valve is opened; 2) Circumferential limiting or circumferential and axial synchronous limiting is realized through the cooperation of simple limiting parts A\B, so as to avoid axial misalignment during circumferential rotation of the flow channel switching assembly, and the target position of circumferential rotation can be conveniently determined; 3) The utility model designs two different rotating drive parts, which respectively realize the drive from the top of the filter bottle or from the sewage discharge end. The specific processing can be selected according to the needs. Both can effectively drive the flow channel switching assembly, better realize the flow channel switching function of the valve head, and have excellent practical performance; 3) Through the cooperation of the guide rail part and the guide part, the axial adjustment of the backwashing skeleton is driven by external force, which overcomes the failure of the pressure difference principle in the prior art.

[0051] The above-described embodiments are only a preferred solution of the present utility model, and do not impose any form of limitation on the present utility model. There are other variations and modifications without exceeding the technical solutions recorded in the claims.

Claims

1. An automatic sewage discharge structure for a filter bottle mounted pre-filter, comprising a valve housing (1), wherein the valve housing (1) is provided with a raw water end (11), a clean water end (12), an upward filter bottle assembly end (13), a downward sewage discharge end (14) and a valve housing cavity (15), wherein the sewage discharge end (14) is provided with a sewage discharge assembly, and wherein: A flow channel switching assembly (2) is provided in the valve housing cavity (15), the flow channel switching assembly (2) being provided with a raw water flow channel (21), a purified water flow channel (22), a sewage discharge flow channel (23) and a backwash water flow channel (24), the flow channel switching assembly (2) being circumferentially rotatingly sealed or axially slidingly sealedly connected to the valve housing cavity (15), and the flow channel switching assembly (2) rotates under the action of an external force to realize flow channel switching between a filtering mode and a backwash sewage discharge mode; The flow channel switching assembly (2) is fixedly provided with a rotating lifting mechanism (7), and the rotating lifting mechanism (7) can cooperate with the backwashing frame of the pre-filter to realize the lifting and lowering of the backwashing frame during the rotation of the rotating lifting mechanism (7) and the flow channel switching assembly (2); A sewage discharge switching element is provided at the lower end of the backwashing frame, and the sewage discharge switching element can open or close the sewage discharge end as the backwashing frame rises and falls.

2. The automatic sewage discharge structure of the filter bottle mounted pre-filter according to claim 1 is characterized by: The sewage discharge switching element is a ceramic valve core sealing element or a sewage discharge switching plug body made of an inert material capable of generating deformation.

3. The automatic sewage discharge structure of the filter bottle mounted pre-filter according to claim 2 is characterized by: The sewage discharge switching plug body is made of rubber or silicone.

4. The automatic sewage discharge structure of the filter bottle mounted pre-filter according to claim 1, 2 or 3, characterized in that: The rotating lifting mechanism (7) comprises a fixing portion (71), a rotating shaft portion (72) and a guide rail portion (73) with an inclination, and is fixed to the flow channel switching assembly (2) via the fixing portion (71), and is rotatably connected to the backwashing skeleton via the rotating shaft portion (72). An adaptable guide member (8) is also provided at the end of the backwashing skeleton, and the axial adjustment of the backwashing skeleton is achieved through the cooperation between the guide member (8) and the guide rail portion (73).

5. The automatic sewage discharge structure of the filter bottle mounted pre-filter according to claim 4 is characterized by: The guide rail portion (73) is arranged in a continuous arc shape along the circumference of the rotating lifting mechanism (7), and the height from the lowest point to the highest point of the guide rail portion (73) is consistent with the maximum stroke of the axial adjustment of the backwashing skeleton.

6. The automatic sewage discharge structure of the filter bottle mounted pre-filter according to claim 4 is characterized by: A limiting portion (74) is also provided at the end of the guide rail portion (73), and the limiting portion (74) is a limiting protrusion and / or an arc-shaped limiting groove.

7. The automatic sewage discharge structure of the filter bottle mounted pre-filter according to claim 1, 2 or 3, characterized in that: At least one limiting portion A (3) is provided in the valve housing cavity (15), and the flow channel switching assembly (2) is provided with at least one matching limiting portion B (4), and through the cooperation of the limiting portion A (3) and the limiting portion B (4), circumferential limiting or synchronous circumferential and axial limiting of the flow channel switching assembly (2) is achieved.

8. The automatic sewage discharge structure of the filter bottle mounted pre-filter according to claim 7 is characterized by: A limiting portion A (3) is provided at the upper and lower parts of the valve shell cavity (15), respectively, and the flow channel switching component (2) is correspondingly provided with two matching limiting portions B (4). Through the dual cooperation of the upper and lower limiting portions A (3) and the limiting portions B (4), the flow channel switching component (2) is double-limited, and the limiting portion A (3) is a groove or a convex block structure, and the limiting portion B (4) is a convex block or a groove structure.

9. The automatic sewage discharge structure of the filter bottle mounted pre-filter according to claim 1, 2 or 3, characterized in that: The flow channel switching assembly (2) is provided with a rotating driving member, which is a driving element extending upward along the axial direction of the filter bottle to the bottom of the filter bottle and connected in a rotating seal, and the flow channel switching assembly (2) is driven by the rotation of the driving element, and the driving element is a manual driving element and / or an electric driving element.

10. The automatic sewage discharge structure of the filter bottle mounted pre-filter according to claim 1, 2 or 3, characterized in that: A sealing element is provided between the flow channel switching assembly (2) and the valve housing cavity (15), and a rotating sealing connection is achieved through the cooperation of the sealing element.

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