Inverted lamination backwash pre-filter capable of adjusting tightness of laminations

Abstract

The utility model relates to an inverted lamination backwash prefilter capable of adjusting lamination tightness, which comprises a valve casing, a filtering and backwash mechanism and a filter bottle, the valve casing is provided with a water inlet end, a water outlet end, an upward filter bottle assembling end and a valve casing cavity, the filter bottle is matched and fixed with the filter bottle assembling end, the filtering and backwash mechanism is arranged in the filter bottle, and the valve casing cavity is communicated with the filter bottle. A cavity between the filtering mechanism and the filtering bottle forms a raw water cavity, the filtering and backwashing mechanism comprises a filtering mechanism and a backwashing mechanism which are coaxially arranged, a flow guide seat is arranged in the valve shell cavity and divides the valve shell cavity into a water inlet end valve shell cavity, a central end valve shell cavity and a water outlet end valve shell cavity, and the water inlet end valve shell cavity, the central end valve shell cavity and the water outlet end valve shell cavity are communicated through the flow guide seat. The water inlet end valve shell cavity is communicated with the water inlet end and is provided with a particle blow-down control valve, the central end valve shell cavity is communicated with a filter screen backwashing blow-down valve through a central blow-down pipe, and the water outlet end valve shell cavity is communicated with the water outlet end. The structure is more optimized, installation occasions can be easily matched, and the multiple drainage channels are arranged so that different application modes can be met.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of inverted adjustable laminated tightness's laminated backwash prefilter, belong to water purification equipment technical field. BACKGROUND

[0002] The mainstream product of prefilter in prior art is filter bottle down type, comprising: head, filter bottle connected with the upper end of head, drain ball valve connected with the lower end of filter bottle, laminated skeleton is arranged in filter bottle, filter laminated is sleeved on the outer wall of laminated skeleton. In the process of use, water flows into the gap between filter bottle and filter laminated from the water inlet of head, flows into the center of laminated skeleton after being filtered by filter laminated, and then flows to the water outlet of head from the center of laminated skeleton, when it is necessary to discharge sewage, open the drain ball valve at the lower end of filter bottle to realize.

[0003] Some installation occasions, this kind of filter bottle down type prefilter is inconvenient to install, therefore, inverted prefilter is born according to market demand, the valve head of this kind of prefilter needs to be set in addition to the water inlet, water outlet and filter bottle mounting port, and also needs to be set sewage outlet, that is, the function of the drain ball valve originally set at the lower end of filter bottle needs to be transferred to the valve head, so the traditional valve head structure needs to be optimized and adjusted.

[0004] In addition, during the use of prefilter, filter laminated and other filter elements need to be cleaned regularly, which is usually realized by reverse flushing mechanism, and then discharged through sewage outlet. The structure of filter element and filter laminated does not change during reverse flushing, for example, the spacing of filter laminated is not adjusted, and there is a situation that flushing is not complete. Therefore, it is considered to automatically adjust the tightness of laminated, improve the efficiency of flushing and improve the effect of flushing during reverse flushing, and the reverse flushing filter screen of reverse flushing mechanism itself also needs to be solved the problem of regular flushing and sewage discharge. The utility model aims to provide an inverted adjustable laminated tightness's laminated backwash prefilter with more optimized structure, easy to match installation occasion, multiple sewage channels to meet different application modes. CONTENT OF UTILITY MODEL

[0005] One of the purposes of the utility model is to solve the deficiencies of prefilter in prior art, and provide an inverted adjustable laminated tightness's laminated backwash prefilter with more optimized structure, easy to match installation occasion, multiple sewage channels to meet different application modes.

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

[0007] The application discloses an inverted adjustable gauze backwashing pre-filter, which comprises a valve shell, a filtering and backwashing mechanism and a filter bottle.

[0008] The filtering mechanism comprises a gauze framework and filtering gauze, the gauze framework comprises a framework body, an inlet end cover and a framework bottom cover, the inlet end cover is provided with an original water inlet channel and a backwashing framework assembly opening, and the framework bottom cover is provided with a backwashing framework assembly opening; the filtering mechanism further comprises a gauze adjusting part which is fixed with the backwashing mechanism and is in abutment with the filtering gauze to press the filtering gauze in the filtering mode and is separated from the filtering gauze to release the filtering gauze in the backwashing mode.

[0009] The application realizes the arrangement of the water inlet end, the water outlet end and the upward filter bottle assembly end on the valve head, and further provides two independent particle discharge channels of the discharge valve and a gauze backwashing discharge channel, that is, the function of the originally arranged drain ball valve at the lower end of the filter bottle is transferred to the valve head, and the traditional valve head structure is effectively optimized and adjusted.

[0010] Preferably, the backwashing mechanism comprises a backwashing skeleton and a backwashing filter element, the backwashing skeleton is divided into a backwashing section, an assembly section and a driving section, the assembly section is inserted into the skeleton body, the backwashing section and the driving section extend out of the backwashing skeleton assembly opening, the backwashing filter element is fixed to the backwashing section, the backwashing section is located in the central end valve shell cavity and is in sliding sealing connection with the central end valve shell cavity, the backwashing section is also provided with a sealing part, and the backwashing mechanism can close or open the raw water inlet channel through the sealing part during axial movement; the driving section is fixedly provided with a backwashing cover, and the backwashing cover is provided with a backwashing water hole; the backwashing mechanism further comprises an elastic reset member, which is arranged between the skeleton body and the backwashing skeleton or between the backwashing cover and the inner wall of the filter bottle, and drives the backwashing mechanism to move axially relative to the filter mechanism under the action of the pressure difference on both sides of the backwashing cover; upward movement closes the raw water inlet channel, the backwashing section is exposed from the central end valve shell cavity, enters the backwashing mode, downward movement opens the raw water inlet channel, the backwashing section extends into the central end valve shell cavity, and enters the filtering mode; and the backwashing filter element is a filter screen, PP cotton or a filter laminated sheet.

[0011] Preferably, there is a pressure difference ΔP on both sides of the backwashing cover, ΔP≥0, when the force corresponding to ΔP is greater than the counterforce of the elastic reset member, the elastic reset member is stretched or compressed, and the backwashing mechanism moves axially upward against the direction of the sewage flow; when the force corresponding to ΔP is less than the counterforce of the elastic reset member, the elastic reset member resets, and the backwashing mechanism moves axially downward along the direction of the sewage flow; and the size of the pressure difference ΔP is adjusted by opening and closing of the laminated sheet backwashing sewage discharge channel.

[0012] Preferably, the water outlet end valve shell cavity is also provided with a backwashing filter cavity, the backwashing filter cavity is provided with a backwashing filter element flushing sewage discharge channel, and the central end valve shell cavity is provided with a backwashing filter element flushing channel. In the backwashing mode of the backwashing filter screen, the sewage for backwashing the backwashing filter screen enters the water outlet end valve shell cavity and is discharged through the backwashing filter element flushing sewage discharge channel, and multiple sewage discharge channels are expanded to meet different application modes.

[0013] Preferably, the filter bottle assembly end is provided with a quick assembly structure for assembly with the filter bottle, and the quick assembly structure adopts a detachable structure comprising a screw connection structure and a clamping structure. The quick assembly structure facilitates user installation and also facilitates replacement and maintenance of the filter bottle, or facilitates disassembly and cleaning when impurities are left in the valve head and cause blockage.

[0014] Preferably, the flow guide seat is provided with a buffer wall in the water inlet end valve shell cavity, and a buffer zone is formed below the buffer wall. The buffer wall and the buffer zone are arranged to allow large-particle impurities to deposit and be discharged through the particle sewage discharge channel, thereby delaying the blockage of the filter element and improving the performance of the pre-filter.

[0015] Preferably, the buffer wall comprises a blocking part, a slanting flow guiding part and a vertical flow guiding part, and the joint of the blocking part, the slanting flow guiding part and the vertical flow guiding part is a circular arc transition. Through the change of water flow direction and flow rate, the effect of large particle impurities deposition is improved, the performance of the pre-filter is further improved, and the service life is prolonged.

[0016] Preferably, the flow guiding seat is provided with a flow guiding pipe at the water outlet end valve shell cavity, and the flow guiding pipe is provided with a transition zone. Through the setting of the flow guiding pipe and the transition zone, the purified water at the water outlet end is stably discharged, and the large flow and flow rate fluctuation is avoided.

[0017] Preferably, the transition zone is a circular arc transition, and the axial direction of the flow guiding pipe is consistent with the axial direction of the water outlet end. The setting of the circular arc transition zone and the axial direction consistent can reduce the resistance of the purified water outflow, stably discharge the purified water at the water outlet end, and avoid large flow and flow rate fluctuation.

[0018] Preferably, the flow guiding seat is integrally formed by inert material, the inert material is rubber or plastic, or at least one side in contact with water is provided with an inert material coating, and the inert material is plastic, rubber or ceramic.

[0019] Preferably, the flow guiding seat is provided with an assembly part at the central end valve shell cavity, the assembly part is matched with the backwashing section of the filter and backwashing filter mechanism, and the inner cavity of the filter and backwashing mechanism can communicate with the central end valve shell cavity.

[0020] Preferably, the water inlet end, the water outlet end and the filter bottle assembly end are provided with an isolation bushing, the isolation bushing is processed by inert material, the isolation bushing comprises a water inlet end isolation bushing, a water outlet end isolation bushing and an assembly end isolation bushing, and is integrally injection molded by plastic or rubber material; or at least one side in contact with water of the isolation bushing is provided with an inert material coating, and the inert material is plastic, rubber or ceramic.

[0021] The utility model discloses beneficial effect is: the utility model realizes to the valve head setting water inlet end, water outlet end, the filter bottle assembly end of going up, still sets up two independent blowdown valve particle blowdown channel, laminated backflushing blowdown channel, namely the function of the original setting in the filter bottle lower end drain ball valve is transferred to the valve head, and the effective optimization adjustment of traditional valve head structure is made. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, below will to the drawing needed using in the embodiment or prior art description simple introduction, obviously, below description in the drawing only some embodiments of the utility model, for the ordinary skilled person in the art comes, under the premise of not paying the creative labor, can also obtain other drawings according to these drawings.

[0023] Figure 1 It is the structure schematic diagram of the utility model;

[0024] Figure 2 It is the structure schematic diagram of the utility model;

[0025] Figure 3 It is the sectional view (filtering state) of the utility model;

[0026] Figure 4 It is the sectional view (particle direct discharge) of the utility model;

[0027] Figure 5 It is the sectional view (backflushing filter element flush blowdown) of the utility model;

[0028] Figure 6 It is the sectional view particle direct discharge (laminated backflushing blowdown) of the utility model;

[0029] Figure 7 It is the exploded view of the utility model;

[0030] Figure 8 It is Figure 7 partial exploded view.

[0031] In the figure: 1, valve shell, 11, water inlet end, 12, water outlet end, 13, filter bottle assembly end, 14, valve shell cavity, 14a, water inlet end valve shell cavity, 14b, central end valve shell cavity, 14c, water outlet end valve shell cavity, 14d, backwashing filter cavity, 2, flow guide seat, 21, buffer wall, 22, buffer zone, 23, flow guide pipe, 24, transition zone, 3, particle discharge channel, 4, central discharge pipe, 5, laminated backwashing discharge channel, 6, backwashing filter element flushing discharge channel, 7, filter bottle, 8, laminated skeleton, 81, water inlet end cover, 82, skeleton bottom cover, 9, filter laminates, 10, backwashing skeleton, 10a, backwashing filter element, 10b, backwashing cover, 10c, sealing part, 10d, laminated adjusting part, A, elastic reset part. DETAILED DESCRIPTION

[0032] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0033] In the description of the present application, it should be understood that, if there is a description of the orientation, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation of the present application.

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

[0035] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application according to the specific content of the technical scheme.

[0036] Embodiment 1

[0037] As Figures 1-8As shown, the inverted adjustable gauze backwashing pre-filter comprises a valve shell 1, a filtering and backwashing mechanism and a filter bottle 7, the valve shell 1 is provided with a water inlet end 11, a water outlet end 12, an upward filter bottle assembly end 13 and a valve shell cavity 14, the filter bottle 7 is fixedly connected with the filter bottle assembly end 13, the filtering and backwashing mechanism is arranged in the filter bottle 7, and a cavity between the filtering mechanism and the filter bottle 7 forms a raw water cavity, the filtering and backwashing mechanism comprises a filtering mechanism and a backwashing mechanism arranged coaxially, characterized in that: a flow guide seat 2 is arranged in the valve shell cavity 14, the flow guide seat 2 divides the valve shell cavity 14 into a water inlet end valve shell cavity 14a, a central end valve shell cavity 14b and a water outlet end valve shell cavity 14c, the water inlet end valve shell cavity 14a is communicated with the water inlet end 11 and is provided with a particle discharge channel 3, the central end valve shell cavity 14b is communicated through a central discharge pipe 4 and is provided with a gauze backwashing discharge channel 5, and the water outlet end valve shell cavity 14c is communicated with the water outlet end 12; an end of the backwashing mechanism is matched with the central end valve shell cavity 14b, and the backwashing mechanism can move axially relative to the filtering mechanism under the action of a pressure difference, so as to switch a filtering mode and a backwashing mode.

[0038] The filtering mechanism comprises a gauze skeleton 8 and a filtering gauze 9, the gauze skeleton 8 comprises a skeleton body, a water inlet end cover 81 and a skeleton bottom cover 82, the water inlet end cover 81 is provided with a raw water inlet channel and a backwashing skeleton assembly opening, the skeleton bottom cover 82 is provided with a backwashing skeleton assembly opening; further comprising a gauze adjusting part (10d, fixedly arranged on the inner side of the backwashing cover 10b), which is fixed with the backwashing mechanism and abuts against and compresses the filtering gauze 9 in the filtering mode and releases the abutment with the filtering gauze 9 in the backwashing mode to loosen the filtering gauze.

[0039] The utility model realizes to valve head setting water inlet end, water outlet end, upward filter bottle assembly end, still sets up two independent blowdown valve particle discharge channel, gauze backwashing discharge channel, namely will the function that the original setting is in the filter bottle lower extreme blowdown ball valve is transferred to the valve head, to the traditional valve head structure has carried out effective optimization adjustment. When filtering, raw water flows into the raw water cavity between the filtering mechanism and the filter bottle from the water inlet end, the water inlet end valve shell cavity in turn, after filtering, flows out through the central end valve shell cavity, the water outlet end valve shell cavity and the water outlet end; large particle impurities are accumulated in the water inlet end valve shell cavity and can be directly discharged through the particle direct discharge control valve, when the backwashing mode, the sewage for backwashing the filtering gauze enters the raw water cavity, and the raw water cavity is discharged through the central discharge pipe to the gauze backwashing discharge channel. The structure is more optimized, easy to match installation occasion, has multiple blowdown channels to meet the application mode.

[0040] Specifically, the backwashing mechanism includes a backwashing frame 10 and a backwashing filter element 10a. The backwashing frame 10 is divided into a backwashing section, an assembly section, and a drive section. The assembly section is inserted into the frame body. The backwashing section and the drive section extend from the assembly port of the backwashing frame. The backwashing filter element 10a is fixed to the backwashing section. The backwashing section is located in the central valve housing cavity 14b and is slidably sealed to the central valve housing cavity 14b. The backwashing section is also provided with a sealing part 10c. When the backwashing mechanism moves axially, the sealing part 10c can close or open the raw water inlet channel. The drive section is fixedly provided with a backwashing cover 10b. The wash cover 10b is provided with a backwash water hole; it also includes an elastic reset member A, which is located between the skeleton body and the backwash skeleton 10a, or between the backwash cover 10b and the inner wall of the filter bottle 7. Under the pressure difference on both sides of the backwash cover 10b, the backwash mechanism is driven to move axially relative to the filtration mechanism; when it moves upward, it closes the raw water inlet channel, and the backwash section is exposed from the central end valve shell cavity 14b, entering the backwash mode; when it moves downward, it opens the raw water inlet channel, and the backwash section extends into the central end valve shell cavity 14b, entering the filtration mode; the backwash filter element 10a is a filter screen, PP cotton, or filter disc.

[0041] In this embodiment, there is a pressure difference ΔP on both sides of the backwash cover 10b. When ΔP ≥ 0 and the force corresponding to ΔP is greater than the reaction force of the elastic reset member A, the elastic reset member A is stretched or compressed, and the backwash mechanism moves upward axially against the direction of sewage flow. When the force corresponding to ΔP is less than the reaction force of the elastic reset member A, the elastic reset member A is reset, and the backwash mechanism moves downward axially in the direction of sewage flow. The pressure difference ΔP is adjusted by opening and closing the stacked backwash sewage discharge channel 5.

[0042] In this embodiment, the outlet valve housing 14c is further provided with a backwashing filtration chamber 14d, which has a backwashing filter element flushing and drainage channel 6. The central valve housing 14b is provided with a backwashing filter element flushing channel. In the backwashing mode of the backwashing filter, the wastewater that backwashes the backwashing filter enters the outlet valve housing and is discharged through the backwashing filter element flushing and drainage channel, thus expanding the drainage channels to meet different application modes. The filter bottle assembly end 13 is provided with a quick-installation structure for assembling the filter bottle. The quick-installation structure is detachable and includes a screw connection and a snap-fit ​​connection. This quick-installation structure facilitates user installation, filter bottle replacement and maintenance, and easy disassembly and cleaning when impurities remain and clog the valve head.

[0043] More specifically, the flow guide base 2 is provided with a buffer wall 21 at the water inlet end valve shell cavity 14a, and a buffer area 22 is formed below the buffer wall 21. By setting the buffer wall and the buffer area, the large particle impurities are deposited when passing through, and are discharged through the particle discharge channel, which delays the clogging of the filter element and improves the performance of the pre-filter. The buffer wall 21 includes a blocking part, a slanting flow guiding part and a vertical flow guiding part, and the junction of the blocking part, the slanting flow guiding part and the vertical flow guiding part is a circular arc transition. By changing the direction and speed of the water flow, the deposition effect of large particle impurities is improved, the performance of the pre-filter is further improved, and the service life is prolonged. The flow guide base 2 is provided with a flow guide pipe 23 at the water outlet end valve shell cavity 14c, and the flow guide pipe 23 is provided with a transition area 24. By setting the flow guide pipe and the transition area, the purified water at the water outlet end is stably discharged, and large flow and speed fluctuations are avoided.

[0044] In this embodiment, the transition area 24 is a circular arc transition, and the axial direction of the flow guide pipe 23 is consistent with the axial direction of the water outlet end 12. The circular arc transition area and the axial direction are consistent, which can reduce the resistance of the purified water flowing out, stably discharge the purified water at the water outlet end, and avoid large flow and speed fluctuations.

[0045] In this embodiment, the environmental friendliness of the valve head is improved. The flow guide base is integrally formed of inert materials, the inert materials are rubber or plastic, or at least one side in contact with water is provided with an inert material coating, and the inert materials are plastic, rubber or ceramic.

[0046] Specifically, the flow guide base 2 is provided with an assembly part at the central end valve shell cavity 14b, the assembly part is adapted to the backwashing section of the backwashing filter mechanism of the inverted adjustable gasket backwashing pre-filter, and the inner cavities of the filter and backwashing mechanism can communicate with the central end valve shell cavity 14b. The water inlet end 11, the water outlet end 12 and the filter bottle assembly end 13 are provided with isolation bushings, the isolation bushings are made of inert materials, the isolation bushings include water inlet end isolation bushings, water outlet end isolation bushings and assembly end isolation bushings, and are integrally injection molded by plastic or rubber materials; or at least one side in contact with water of the isolation bushings is provided with an inert material coating, and the inert materials are plastic, rubber or ceramic.

[0047] The utility model discloses a valve head is provided with the water inlet end, the water outlet end, the filter bottle assembly end of going up, still is provided with two independent blowdown valve particle blowdown channel, lamination backflushing blowdown channel, namely the function of the original setting in the filter bottle lower end blowdown ball valve is transferred to the valve head, and the effective optimization adjustment is made to the traditional valve head structure. When filtering, raw water flows into the raw water cavity between the filter mechanism and the filter bottle from the water inlet end, the water inlet end valve shell cavity in proper order, and after filtering, flows out through the central end valve shell cavity, the water outlet end valve shell cavity and the water outlet end, and the big particle impurity is accumulated in the water inlet end valve shell cavity, can be directly discharged through the particle direct discharge control valve, when the backflushing mode, the sewage of the reverse washing of filter lamination enters the raw water cavity, and the raw water cavity is reserved to the lamination backflushing blowdown channel through the central blowdown pipe and is discharged. The structure is more optimized, and the matching installation occasion is easy, has multiple blowdown channels to satisfy the application mode. Under the backflushing mode of the backflushing filter screen, the sewage of the reverse washing of the backflushing filter screen enters the water outlet end valve shell cavity, and is discharged through the backflushing filter element flushing blowdown channel, and multiple blowdown channels are expanded to satisfy the application mode.

[0048] The above-mentioned embodiment is only a preferred scheme of the utility model, and does not limit the utility model in any form, and other variants and modifications are still possible without exceeding the technical scheme recorded in the claims.

Claims

1. An inverted adjustable disc backwashing pre-filter, comprising a valve housing (1), a filtration and backwashing mechanism, and a filter bottle (7), wherein the valve housing (1) has an inlet end (11), an outlet end (12), an upward-facing filter bottle assembly end (13), and a valve housing cavity (14), the filter bottle (7) is fixedly fitted to the filter bottle assembly end (13), the filtration and backwashing mechanism is located inside the filter bottle (7), and the cavity between the filtration mechanism and the filter bottle (7) constitutes a raw water cavity, wherein the filtration and backwashing mechanism comprises a filtration mechanism and a backwashing mechanism arranged coaxially, characterized in that: The valve shell cavity (14) is provided with a flow guide seat (2), which divides the valve shell cavity (14) into a water inlet end valve shell cavity (14a), a central end valve shell cavity (14b) and a water outlet end valve shell cavity (14c). The water inlet end valve shell cavity (14a) is communicated with the water inlet end (11) and is provided with a particle blowdown channel (3). The central end valve shell cavity (14b) is communicated by a central blowdown pipe (4) and is provided with a laminated backwashing blowdown channel (5). The water outlet end valve shell cavity (14c) is communicated with the water outlet end (12). The end of the backwashing mechanism is adapted to the central end valve shell cavity (14b), and the backwashing mechanism can move axially relative to the filtering mechanism under the action of pressure difference to switch the filtering mode and the backwashing mode. The filtering mechanism includes a laminated skeleton (8) and a filtering laminated sheet (9). The laminated skeleton (8) includes a skeleton body, a water inlet end cover (81) and a skeleton bottom cover (82). The water inlet end cover (81) is provided with a raw water inlet channel and a backwashing skeleton assembly opening. The skeleton bottom cover (82) is provided with a backwashing skeleton assembly opening. The filtering mechanism further includes a laminated sheet adjusting member (10d) which is fixed with the backwashing mechanism and abuts against and presses the filtering laminated sheet (9) in the filtering mode and releases the abutment with the filtering laminated sheet (9) to loosen the filtering laminated sheet (9) in the backwashing mode.

2. The inverted adjustable gapped backflush prefilter of claim 1, wherein: The backwashing mechanism includes a backwashing skeleton (10) and a backwashing filtering element (10a). The backwashing skeleton (10) is divided into a backwashing section, an assembly section and a driving section. The assembly section is inserted into the skeleton body. The backwashing section and the driving section extend out of the backwashing skeleton assembly opening. The backwashing filtering element (10a) is fixed to the backwashing section. The backwashing section is located in the central end valve shell cavity (14b) and is in sliding sealing connection with the central end valve shell cavity (14b). The backwashing section is further provided with a sealing part (10c). When the backwashing mechanism moves axially, the sealing part (10c) can close or open the raw water inlet channel. The driving section is fixedly provided with a backwashing cover (10b) which is provided with a backwashing water hole. The backwashing mechanism further includes an elastic return member (A) which is arranged between the skeleton body and the backwashing skeleton (10) or between the backwashing cover (10b) and the inner wall of the filter bottle. Under the action of the pressure difference on both sides of the backwashing cover (10b), the backwashing mechanism is driven to move axially relative to the filtering mechanism. When moving upward, the raw water inlet channel is closed, the backwashing section is exposed from the central end valve shell cavity (14b), the backwashing mode is entered, and when moving downward, the raw water inlet channel is opened, the backwashing section is inserted into the central end valve shell cavity (14b), and the filtering mode is entered. The backwashing filtering element (10a) is a filtering screen, PP cotton or a filtering laminated sheet (9).

3. The inverted adjustable gapped backflush prefilter of claim 2, wherein: When the pressure difference △P on both sides of the backwashing cover (10b) is greater than or equal to 0, and the corresponding force is greater than the counterforce of the elastic reset member (A), the elastic reset member (A) is stretched or compressed, and the backwashing mechanism moves axially in the direction opposite to the sewage flow; when the corresponding force is less than the counterforce of the elastic reset member (A), the elastic reset member (A) resets, and the backwashing mechanism moves axially in the direction of the sewage flow; the opening and closing of the laminated backwashing sewage discharge channel (5) adjusts the size of the pressure difference △P.

4. The inverted adjustable gapped backflush prefilter of claim 2 or 3, wherein: The water outlet end valve housing cavity (14c) is further provided with a backwashing filtration cavity (14d) provided with a backwashing filtration element flushing sewage discharge channel (6), and the central end valve housing cavity (14b) is provided with a backwashing filtration element flushing channel; the filter bottle assembly end (13) is provided with a quick assembly structure matched with the filter bottle, and the quick assembly structure adopts a detachable structure including a screw connection structure and a clamping structure.

5. The inverted adjustable gauze backflushing prefilter of claim 1 or 2 or 3, wherein: The flow guide base (2) is provided with a buffer wall (21) in the water inlet end valve housing cavity (14a), and a buffer area (22) is formed below the buffer wall (21).

6. The inverted adjustable gapped backflush prefilter of claim 5, wherein: The buffer wall (21) includes a blocking part, an inclined flow guide part and a vertical flow guide part, and the junction of the blocking part, the inclined flow guide part and the vertical flow guide part is a circular arc transition.

7. The inverted adjustable gapped-flush backwash prefilter of claim 5, wherein: The flow guide base (2) is provided with a flow guide pipe (23) in the water outlet end valve housing cavity (14c), and the flow guide pipe (23) is provided with a transition area (24); the transition area (24) is a circular arc transition, and the axial direction of the flow guide pipe (23) is consistent with the axial direction of the water outlet end (12).

8. The inverted adjustable gauze backflushing prefilter of claim 1 or 2 or 3, wherein: The flow guide base is integrally formed of inert materials, the inert materials are rubber or plastic, or at least one side in contact with water is provided with an inert material coating, and the inert materials are plastic, rubber or ceramic.

9. The inverted adjustable gauze backflushing prefilter of claim 1 or 2 or 3, wherein: The water inlet end (11), the water outlet end (12) and the filter bottle assembly end (13) are provided with isolation bushings, the isolation bushings are made of inert materials, the isolation bushings include water inlet end isolation bushings, water outlet end isolation bushings and assembly end isolation bushings, and are integrally injection molded by plastic or rubber materials; or at least one side in contact with water of the isolation bushings is provided with an inert material coating, and the inert materials are plastic, rubber or ceramic.

10. The inverted adjustable gauze backflushing prefilter of claim 1 or 2 or 3, wherein: The flow guide base (2) located in the central end valve housing cavity (14b) is provided with an assembly part adapted to the backwashing section of the filtering and backwashing mechanism, and the inner cavity of the filtering and backwashing mechanism can communicate with the central end valve housing cavity (14b).

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