Backwash axial adjusting structure of prefilter with top-mounted filter bottle and prefilter

Abstract

The backwashing axial adjusting 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 backwashing axial adjusting structure of the prefilter with the top-mounted filter bottle is simple in structure, more optimized in structure and easy to match with an installation occasion, and can realize the switching of three states of filtering, pollution discharge and backwashing pollution discharge.

Description

Technical Field

[0001] The utility model relates to an axial adjustment structure for backwashing a pre-filter with an upper-mounted filter bottle and a pre-filter, belonging to the technical field of water purification equipment. Background Art

[0002] The mainstream products of pre-filters in the prior art are of the type with a lower-mounted filter bottle, including: a machine head, a filter bottle connected to the upper end of the machine head, and a drain ball valve connected to the lower end of the filter bottle. A filter screen skeleton is arranged inside the filter bottle, and a filter screen is sleeved on the outer wall of the filter screen skeleton. During use, water flows into the gap between the filter bottle and the filter screen from the water inlet of the machine head, flows through the filter screen and then into the center of the filter screen skeleton after being filtered, and then flows from the center of the filter screen skeleton to the water outlet of the machine head. When sewage discharge is required, the drain ball valve at the lower end of the filter bottle is opened to achieve this. In some installation scenarios, the installation of this type of pre-filter with a lower-mounted filter bottle is inconvenient. For this reason, the pre-filter with an upper-mounted filter bottle emerged in response to market demand. For the valve head of this type of pre-filter, in addition to setting a water inlet, a water outlet, and a filter bottle installation port, a sewage discharge port also needs to be set, that is, the function of the original drain ball valve arranged at the lower end of the filter bottle needs to be transferred to the valve head. Therefore, the traditional backwashing axial adjustment structure needs to be optimized and adjusted. In addition, the pre-filter in the prior art has a composite function of filtering and backwashing. During backwashing, the principle of pressure difference is used to enable the backwashing skeleton to move axially. This method also has certain defects, that is, it is prone to failure.

[0003] The utility model aims to provide an axial adjustment structure for backwashing a pre-filter with an upper-mounted filter bottle that has a more optimized structure and is easy to match the installation scenario, can realize the switching among three states of filtering, sewage discharge, and backwashing sewage discharge, and solves the problem of the failure of the axial movement of the backwashing skeleton. The utility model also aims to provide a pre-filter with the axial adjustment structure for backwashing a pre-filter with an upper-mounted filter bottle. Summary of the Utility Model

[0004] One of the purposes of the utility model is to solve the deficiencies of the pre-filter in the prior art, provide an axial adjustment structure for backwashing a pre-filter with an upper-mounted filter bottle that has a more optimized structure and is easy to match the installation scenario, and can realize the switching among three states of filtering, sewage discharge, and backwashing sewage discharge.

[0005] Another purpose of the utility model is to further provide a pre-filter with the axial adjustment structure for backwashing a pre-filter with an upper-mounted filter bottle.

[0006] The technical solution adopted by the utility model to solve its technical problems is as follows:

[0007] The upper-mounted pre-filter backwashing axial adjustment structure for the filter bottle includes a valve housing, which 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 component, and a flow path switching component is arranged in the valve housing cavity. The flow path switching component is provided with a raw water flow path, a purified water flow path, a sewage discharge flow path, and a backwashing water flow path. The flow path switching component is circumferentially rotationally sealed or axially slidably sealed with the valve housing cavity, and the flow path switching component rotates under the action of an external force to realize the flow path switching between the filtration mode and the backwashing sewage discharge mode.

[0008] The flow path switching component is fixedly provided with a rotating and lifting mechanism, which can cooperate with the backwashing skeleton of the pre-filter to realize the lifting of the backwashing skeleton during the rotation of the rotating and lifting mechanism and the flow path switching component.

[0009] Preferably, the rotating and lifting mechanism includes a fixing part, a rotating shaft part, and a guide rail part with an inclination. It is fixed to the flow path switching component or the valve housing through the fixing part, rotatably connected to the backwashing skeleton through the rotating shaft part, and a suitable guide part is also provided at the end of the backwashing skeleton. Through the cooperation of the guide part and the guide rail part, the axial adjustment of the backwashing skeleton is realized.

[0010] Preferably, the guide rail part is arranged in a continuous arc shape along the circumference of the rotating and lifting mechanism, and the height from the lowest point to the highest point of the guide rail part is consistent with the maximum stroke of the axial adjustment of the backwashing skeleton.

[0011] Preferably, a limiting part is also provided at the end of the guide rail part, and the limiting part is a limiting convex block and / or an arc-shaped limiting groove.

[0012] Preferably, the flow path switching component rotates under the action of an external force, can close the raw water flow path and / or the purified water flow path, and open the backwashing water flow path to switch to the backwashing mode; it can open the raw water flow path and the purified water flow path, and close the backwashing water flow path to switch to the filtration mode.

[0013] Preferably, the flow path switching component rotates 30 - 180° under the action of an external force to switch to the backwashing mode; the flow path switching component rotates reversely and resets by the same angle under the action of an external force to switch to the filtration mode.

[0014] The utility model realizes the setting of a water inlet, a water outlet and a filter bottle installation port on the valve head, and also sets a sewage discharge port, that is, the function of the drain ball valve originally arranged at the lower end of the filter bottle is transferred to the valve head, and the traditional backwashing axial adjustment structure is effectively optimized and adjusted. Specifically, during filtration, through the rotation of the flow channel switching component, the raw water end is connected to the raw water flow channel, and the purified water flow channel is connected to the purified water end; when sewage discharge is required, rotate the flow channel switching component to close the raw water flow channel and / or the purified water flow channel, and open the sewage discharge valve; when backwashing sewage discharge is required, connect the backwashing water flow channel to the raw water flow channel, wash the impurities accumulated on the valve head, and then discharge them through the sewage discharge valve.

[0015] Preferably, the filter bottle assembly end is provided with a quick installation structure for assembling with the filter bottle. The quick installation structure adopts a detachable structure, including a screwing structure and a clamping structure. This kind of quick installation structure is convenient for users to install, and is also convenient for the replacement and maintenance of the filter bottle. Or when impurities remain blocked inside the valve head, it is convenient to disassemble and clean.

[0016] Preferably, at least one limiting part A is arranged in the valve housing cavity, and at least one matching limiting part B is arranged on the flow channel switching component. Through the cooperation of the limiting part A and the limiting part B, circumferential limiting or circumferential and axial synchronous limiting of the flow channel switching component is realized. Through the simple cooperation of the limiting parts A and B, circumferential limiting or circumferential and axial synchronous limiting is realized, avoiding axial misalignment when the flow channel switching component rotates circumferentially, and being able to conveniently determine the target position of circumferential rotation.

[0017] More preferably, one limiting part A is respectively arranged at the upper and lower parts in the valve housing cavity, and two matching limiting parts B are correspondingly arranged on the flow channel switching component. Through the double cooperation of the upper and lower limiting parts A and B, double limiting of the flow channel switching component is realized. Through the simple double cooperation of the limiting parts A and B, double limiting is realized, avoiding axial misalignment when the flow channel switching component rotates circumferentially, and being able to conveniently determine the target position of circumferential rotation, further improving the reliability of the flow channel switching of the valve head.

[0018] Preferably, the limiting part A is a groove or convex block structure, and the limiting part B is a convex block or groove structure. This kind of limiting structure is convenient for mold processing, easy to demold, and has high limiting reliability.

[0019] Preferably, the flow channel switching component is provided with a rotation driving member, which is a driving element extending axially upward along the filter bottle to the bottom of the filter bottle and rotationally and sealingly connected. The flow channel switching component is driven by the rotation of the driving element, or the flow channel switching component is linked with the sewage discharging component, and the sewage discharging component is rotationally and sealingly connected to the sewage discharging end. The rotation of the sewage discharging component realizes the rotation of the flow channel switching component. The present utility model designs two different rotation driving members, respectively realizing the driving from the top of the filter bottle or from the sewage discharging end. During specific processing, selection can be made according to needs, and both can effectively drive the flow channel switching component, preferably realizing the flow channel switching function of the valve head, and having excellent practical performance.

[0020] Preferably, through the linkage mode of the flow channel switching component and the sewage discharging component, the sewage discharging component includes a sewage discharging seal and a sewage discharging valve. The sewage discharging seal is rotationally and sealingly connected to the sewage discharging end, and the sewage discharging valve is fixedly connected to the sewage discharging seal.

[0021] Preferably, the driving element is a manual driving element and / or an electric driving element. It realizes the driving rotation of the flow channel switching component manually, automatically or in a manual and automatic integrated manner, and improves the application scenarios of the product.

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

[0023] A pre-filter adopts the backwashing axial adjustment structure of the present utility model.

[0024] The beneficial effects of the present utility model are as follows: 1) The present utility model realizes that in addition to setting the water inlet, water outlet and filter bottle installation port on the valve head, a sewage discharge port is also set, that is, the function of the drain ball valve originally set at the lower end of the filter bottle is transferred to the valve head, and an effective optimization adjustment is made to the traditional backwashing axial adjustment structure. Specifically, during filtration, through the rotation of the flow channel switching component, the raw water end is communicated with the raw water flow channel, and the purified water flow channel is communicated with the purified water end; when sewage discharge is required, the flow channel switching component is rotated to close the raw water flow channel and / or the purified water flow channel, and the sewage discharge valve is opened; 2) Through the cooperation of the simple limiting parts A and B for circumferential limiting or circumferential and axial synchronous limiting, the axial misalignment during the circumferential rotation of the flow channel switching component is avoided, and the target position of the circumferential rotation can be conveniently determined; 3) The present utility model designs two different rotation driving members, respectively realizing the driving from the top of the filter bottle or from the sewage discharging end. During specific processing, selection can be made according to needs, and both can effectively drive the flow channel switching component, preferably realizing the flow channel switching function of the valve head, and having excellent practical performance; 3) Through the cooperation of the guide rail part and the guide part, the axial adjustment of the backwashing framework is driven by an external force, overcoming the situation where the pressure difference principle in the prior art fails. Description of the Drawings

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0026] Figure 1 is the structural schematic diagram of the present invention;

[0027] Figure 2 is Figure 1 the cross-sectional view of

[0028] Figure 3 is Figure 1 the cross-sectional view of (opening the original water flow channel and the purified water flow channel);

[0029] Figure 4 is Figure 1 the cross-sectional view of (closing the original water flow channel and the purified water flow channel);

[0030] Figure 5 is the exploded view of the present invention.

[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. original water flow channel, 22. purified 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. guide rail part, 71. fixing part, 72. rotating part, 73. guide rail part, 74. limiting part, 8. guiding part. Specific embodiments

[0032] The following will describe in detail the embodiments of the present invention. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0033] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0034] In the description of the present utility model, if the first and the second are described only for the purpose of distinguishing technical features, they should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features or implicitly specifying the sequence of the indicated technical features.

[0035] In the description of the present utility model, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the relevant technical field can reasonably determine the specific meanings of the above terms in the present utility model in combination with the specific content of the technical solution. Embodiment

[0036] As Figures 1-5 As shown, the filter bottle top-mounted pre-filter backwashing axial adjustment structure includes a valve housing 1. The valve housing 1 is provided with a raw water end 11, a purified water end 12, an upward filter bottle assembly end 13, a downward sewage discharge end 14 and a valve housing cavity 15. The sewage discharge end 14 is provided with a sewage discharge assembly. A flow path switching assembly 2 is arranged in the valve housing cavity 15. The flow path switching assembly 2 is provided with a raw water flow path 21 corresponding to the raw water end 11, a purified water flow path 22 corresponding to the filter bottle assembly end 13 and the purified water end 12, and a sewage discharge flow path corresponding to the sewage discharge end 14. An anti-backwashing flow path 24 is also arranged between the raw water flow path 21 and the purified water flow path 22. The flow path switching assembly 2 is rotationally and sealingly connected to the valve housing cavity 15. When the flow path switching assembly 2 rotates under the action of an external force, the flow path switching between the filtering and backwashing modes is realized.

[0037] The flow path switching assembly 2 is fixedly provided with a rotating and lifting mechanism 7. The rotating and lifting mechanism 7 can cooperate with the backwashing framework of the pre-filter, and the backwashing framework is lifted and lowered during the relative rotation of the rotating and lifting mechanism and the flow path switching assembly 2. In this embodiment, by rotating the flow path switching assembly 2, the rotating and lifting mechanism 7 is driven to rotate, driving the backwashing framework to lift and lower.

[0038] Specifically, the rotating and lifting mechanism 7 includes a fixing part 71, a rotating shaft part 72 and a guide rail part 73 with an inclination. It is fixed to the flow path switching assembly 2 through the fixing part 71, and is rotatably connected to the backwashing framework through the rotating shaft part 72. A matching guide part 8 is also arranged at the end of the backwashing framework. Through the cooperation of the guide part 8 and the guide rail part 73, the axial adjustment of the backwashing framework is realized.

[0039] Specifically, the guide rail part 73 is arranged in a continuous arc shape along the circumferential direction of the rotating and lifting mechanism 7. The height from the lowest point to the highest point of the guide rail part 73 is consistent with the maximum stroke of the axial adjustment of the backwashing framework. A limiting part 74 is also arranged at the end of the guide rail part 73. The limiting part 74 is a limiting convex block and / or an arc-shaped limiting groove.

[0040] Specifically, the flow channel switching component 2 rotates under the action of an external force, and can close the original water flow channel 21 and / or the purified water flow channel 22 (either close them simultaneously or close any one of them), open the sewage discharge valve 6, and enter the sewage discharge mode. It can also open the backwash water flow channel 24 simultaneously and switch to the backwash sewage discharge mode; it can open the original 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.

[0041] In addition, the flow channel switching component 2 can also be axially slidably and sealingly connected to the valve housing cavity 15, which can be selected by those skilled in the art according to needs.

[0042] As a specific implementable solution, the flow channel switching component 2 rotates 30 - 180° under the action of an external force, such as 30°, 45°, 60°, 90°, 120°, 180°. In this embodiment, 45° is selected to switch to the backwash mode; the flow channel switching component 2 rotates reversely and resets by the same angle (45° is selected in this embodiment) under the action of an external force to switch to the filtration mode.

[0043] The utility model realizes that in addition to setting an inlet, an outlet and a filter bottle installation port on the valve head, a sewage discharge port is also set, that is, the function of the drain ball valve originally set at the lower end of the filter bottle is transferred to the valve head, and the traditional backwash axial adjustment structure is effectively optimized and adjusted. Specifically, during filtration, through the rotation of the flow channel switching component 2, the connection between the raw water end 11 and the original water flow channel 21 is realized, and the connection between the purified water flow channel 22 and the purified water end 12 is realized; when sewage discharge is required, rotate the flow channel switching component 2 to close the original water flow channel 21 and / or the purified water flow channel 22, and open the sewage discharge valve; when backwash sewage discharge is required, connect the backwash water flow channel 24 with the original water flow channel 21 to wash the impurities accumulated on the valve head, and then discharge them through the sewage discharge valve 6.

[0044] In this embodiment, the filter bottle assembly end 13 is provided with a quick installation structure for assembling with the filter bottle. The quick installation structure adopts a detachable structure, including a screwing structure and a clamping structure. This kind of quick installation structure is convenient for users to install, and is also convenient for the replacement and maintenance of the filter bottle, or when impurities remain blocked inside the valve head, it is convenient for disassembly and cleaning.

[0045] Specifically, at least one limiting part A3 is provided in the valve housing cavity 15, and at least one matching limiting part B4 is provided on the flow channel switching component 2. Through the cooperation of the limiting part A3 and the limiting part B4, the circumferential limiting or circumferential and axial synchronous limiting of the flow channel switching component 2 is realized. Through the simple cooperation of the limiting parts A and B, circumferential limiting or circumferential and axial synchronous limiting is realized, avoiding axial misalignment when the flow channel switching component 2 rotates circumferentially, and being able to conveniently determine the target position of circumferential rotation.

[0046] More specifically, as a better alternative, a limiting part A3 is respectively provided above and below in the valve housing cavity 15, and the flow path switching assembly 2 is correspondingly provided with two matching limiting parts B4. Through the double cooperation of the upper and lower limiting parts A3 and the limiting parts B4, double axial limiting of the flow path switching assembly 2 is achieved. Through the simple cooperation of the double limiting parts A and B, double limiting is realized, avoiding axial misalignment when the flow path switching assembly 2 rotates circumferentially, and being able to conveniently determine the target position of circumferential rotation, further improving the reliability of the flow path switching of the valve head.

[0047] In this embodiment, the limiting part A3 is a groove or a convex block structure, and the limiting part B4 is a convex block or a groove structure. This kind of limiting structure is convenient for mold processing, easy to demold, and has high limiting reliability. The flow path switching assembly 2 is provided with a rotation driving part, and the rotation driving part is a driving element that extends axially upward along the filter bottle to the bottom of the filter bottle and is rotationally and sealingly connected. The flow path switching assembly 2 is driven by the rotation of the driving element, or the flow path switching assembly 2 is linked with the sewage discharge assembly, and the sewage discharge assembly is rotationally and sealingly connected with the sewage discharge end 14. The rotation of the sewage discharge assembly realizes the rotation of the flow path switching assembly 2. The present utility model designs two different rotation driving parts, respectively realizing driving from the top of the filter bottle or from the sewage discharge end. During specific processing, selection can be made according to needs, and both can effectively drive the flow path switching assembly, preferably realizing the flow path switching function of the valve head, and having excellent practical performance.

[0048] In this embodiment, through the linkage mode of the flow path switching assembly 2 and the sewage discharge assembly, the sewage discharge assembly includes a sewage discharge seal 5 and a sewage discharge valve 6. The sewage discharge seal 5 is rotationally and sealingly connected with the sewage discharge end 14, and the sewage discharge valve 6 is fixedly connected with the sewage discharge seal 5. The driving element is a manual driving element and / or an electric driving element. Realize the driving rotation of the flow path switching assembly 2 manually, automatically or in a manual-automatic integrated manner, improving the application scenarios of the product. A sealing element is provided between the flow path switching assembly 2 and the valve housing cavity 15, and through the cooperation of the sealing element, rotational and sealing connection is realized. Embodiment

[0049] A pre-filter adopts the backwashing axial adjustment structure described in the present utility model, and the flow channel switching structure is the same as that in Embodiment 1. The beneficial effects of the present utility model are as follows: 1) The present utility model realizes that in addition to setting the water inlet, water outlet and filter bottle installation port on the valve head, a sewage discharge port is also set, that is, the function of the drain ball valve originally set at the lower end of the filter bottle is transferred to the valve head, and the traditional backwashing axial adjustment structure is effectively optimized and adjusted. Specifically, during filtration, through the rotation of the flow channel switching component, the raw water end is connected to the raw water flow channel, and the purified water flow channel is connected to the purified water end; when sewage discharge is required, rotate the flow channel switching component, close the raw water flow channel and / or the purified water flow channel, and open the sewage discharge valve; 2) Through the cooperation of the simple limit parts A and B, circumferential limit or circumferential and axial synchronous limit is realized, avoiding axial misalignment when the flow channel switching component rotates circumferentially, and the target position of circumferential rotation can be conveniently determined; 3) The present utility model designs two different rotation driving parts, which respectively realize driving from the top of the filter bottle or from the sewage discharge end. During specific processing, selection can be made according to needs, and both can effectively drive the flow channel switching component, and preferably realize the flow channel switching function of the valve head, with 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 an external force, overcoming the situation where the pressure difference principle of the prior art fails.

[0050] 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. The anti - flushing axial adjustment structure of the upper - mounted pre - filter on the filter bottle, including a valve housing (1), the valve housing (1) is provided with a raw water end (11), a purified water end (12), an upward filter bottle assembly end (13), a downward sewage discharge end (14) and a valve housing cavity (15), the sewage discharge end (14) is provided with a sewage discharge component, and it is characterized in that: A flow path switching component (2) is provided in the valve housing cavity (15). The flow path switching component (2) is provided with an original water flow path (21), a purified water flow path (22), a sewage discharge flow path (23), and a backwash water flow path (24). The flow path switching component (2) is circumferentially rotatably and sealingly connected or axially slidably and sealingly connected to the valve housing cavity (15). The flow path switching component (2) rotates under the action of an external force to achieve the switching of the flow paths between the filtration mode and the backwash and sewage discharge mode. The flow path switching component (2) is fixedly provided with a rotation and lifting mechanism (7). The rotation and lifting mechanism (7) can cooperate with the backwash framework of the pre-filter to achieve the lifting of the backwash framework during the rotation of the rotation and lifting mechanism (7) and the flow path switching component (2).

2. The axial adjustment structure for backwashing of the upper-mounted pre-filter on the filter bottle according to claim 1, characterized in that: The rotation and lifting mechanism (7) includes a fixing part (71), a rotating shaft part (72), and a guide rail part (73) with an inclination. It is fixed to the flow path switching component (2) or the valve housing (1) through the fixing part (71), and is rotatably connected to the backwash framework through the rotating shaft part (72). A matching guide part (8) is also provided at the end of the backwash framework. Through the cooperation of the guide part (8) and the guide rail part (73), the axial adjustment of the backwash framework is achieved.

3. The axial adjustment structure for backwashing of the upper-mounted pre-filter on the filter bottle according to claim 2, characterized in that: The guide rail part (73) is arranged in a continuous arc shape along the circumference of the rotation and lifting mechanism (7). The height from the lowest point to the highest point of the guide rail part (73) is consistent with the maximum stroke of the axial adjustment of the backwash framework.

4. The backwashing axial adjustment structure of the upper-mounted pre-filter on the filter bottle according to claim 1, characterized in that: A limiting part (74) is also provided at the end of the guide rail part (73). The limiting part (74) is a limiting convex block and / or an arc-shaped limiting groove.

5. The axial adjustment structure for backwashing of the upper-mounted pre-filter on the filter bottle according to claim 1, characterized in that: The flow path switching component (2) rotates under the action of an external force, can close the original water flow path (21) and / or the purified water flow path (22), and at the same time open the backwash water flow path (24) to switch to the backwash mode; it can open the original water flow path (21) and the purified water flow path (22), and close the backwash water flow path (24) to switch to the filtration mode.

6. The axial adjustment structure for backwashing of the upper-mounted pre-filter on the filter bottle according to claim 5, wherein: The flow path switching component (2) rotates 30 - 180° under the action of an external force to switch to the backwash mode; the flow path switching component (2) rotates reversely and resets by the same angle under the action of an external force to switch to the filtration mode.

7. The axial adjustment structure for backwashing of the upper-mounted pre-filter on the filter bottle according to claim 1 or 2 or 3 or 4 or 5 or 6, characterized in that: At least one limiting part A (3) is provided in the valve housing cavity (15), and at least one matching limiting part B (4) is provided on the flow path switching component (2). Through the cooperation of the limiting part A (3) and the limiting part B (4), the circumferential limiting or the circumferential and axial synchronous limiting of the flow path switching component (2) is achieved.

8. The anti - flushing axial adjustment structure of the upper - placed pre - filter on the filter bottle according to claim 7, characterized in that: One limiting part A (3) is respectively provided above and below in the valve housing cavity (15), and two matching limiting parts B (4) are correspondingly provided on the flow path switching component (2). Through the double cooperation of the upper and lower limiting parts A (3) and the limiting parts B (4), the double limiting of the flow path switching component (2) is achieved. The limiting part A (3) is a groove or a convex block structure, and the limiting part B (4) is a convex block or a groove structure.

9. The backwashing axial adjustment structure of the upper-mounted pre-filter on the filter bottle according to claim 1 or 2 or 3 or 4 or 5 or 6, characterized in that: The flow path switching component (2) is provided with a rotation driving member, and the rotation driving member is a driving element that extends axially upward along the filter bottle to the bottom of the filter bottle and is rotationally and sealingly connected. The flow path switching component (2) is driven by the rotation of the driving element, or the flow path switching component (2) is linked with the sewage draining component. The sewage draining component is rotationally and sealingly connected to the sewage draining end (14), and the rotation of the sewage draining component is used to realize the rotation of the flow path switching component (2).

10. The axial adjustment structure for backwashing of the upper-mounted pre-filter on the filter bottle according to claim 9, characterized in that: In the way that the flow path switching component (2) is linked with the sewage draining component, the sewage draining component includes a sewage draining seal (5) and a sewage draining valve (6). The sewage draining seal (5) is rotationally and sealingly connected to the sewage draining end (14), and the sewage draining valve (6) is fixedly connected to the sewage draining seal (5).

11. The backwashing axial adjustment structure of the upper-mounted pre-filter on the filter bottle according to claim 9, characterized in that: The driving element is a manual driving element and / or an electric driving element.

12. The backwashing axial adjustment structure of the upper-mounted pre-filter on the filter bottle according to claim 1 or 2, characterized in that: A sealing element is provided between the flow path switching component (2) and the valve housing cavity (15), and rotational sealing connection is realized through the cooperation of the sealing element.

13. A pre-filter, characterized in that, The anti-flushing axial adjustment structure according to any one of claims 1-9 is adopted.

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