Automatically-controlled inverted backwashing pre-filter

Abstract

The invention relates to an automatically controlled inverted backwashing pre-filter, which comprises a valve casing, a filtering and backwashing 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 and the filter bottle assembling end are fixed in a matched manner, the filtering and backwashing mechanism is arranged in the filter bottle, and the valve casing cavity is provided with a water inlet and a water outlet. 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 inverted backwashing pre-filter is simple in structure, more optimized in structure and easy to match with an installation occasion, and is provided with a plurality of blowdown channels to meet the requirement of different application modes for automatic control.

Description

Technical Field

[0001] The invention relates to an automatically controlled inverted backwashing 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 mesh frame is arranged in the filter bottle, and a filter mesh is sleeved on the outer wall of the filter mesh frame. During use, water flows from the water inlet of the machine head into the gap between the filter bottle and the filter mesh, flows into the center of the filter mesh frame after being filtered by the filter mesh, and then flows from the center of the filter mesh 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.

[0003] In some installation occasions, the installation of the pre-filter with the filter bottle below is inconvenient. Therefore, an inverted pre-filter is born to meet market demand. The valve head of this pre-filter, in addition to the water inlet, water outlet and filter bottle installation port, also needs to be equipped 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 the traditional valve head structure needs to be optimized and adjusted.

[0004] In addition, during the use of the pre-filter, the filter element and the filter screen need to be cleaned regularly, which is generally achieved by a backwashing mechanism and then discharged through the sewage outlet. However, the backwashing filter screen of the backwashing mechanism itself also needs to be regularly flushed and drained. The present invention aims to provide an inverted backwashing pre-filter with a more optimized structure, easy to match the installation occasion, and multiple sewage discharge channels to meet the automatic control of different application modes. Summary of the invention

[0005] One of the purposes of the present invention is to solve the deficiencies of the prior art pre-filter and to provide an inverted backwash pre-filter with a more optimized structure, easy to match the installation occasion, and having multiple sewage discharge channels to meet the automatic control of different application modes.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] An automatically controlled inverted backwashing pre-filter comprises a controller, a valve housing, a filtering and backwashing mechanism and a filter bottle, wherein the valve housing is provided with a water inlet end, a water outlet end, an upward filter bottle assembly end and a valve housing cavity, the filter bottle is fixed with the filter bottle assembly end, the filtering and backwashing mechanism is arranged in the filter bottle, the cavity between the filtering mechanism and the filter bottle constitutes a raw water cavity, the filtering and backwashing mechanism comprises a coaxially arranged filtering mechanism and a backwashing mechanism, a guide seat is arranged in the valve housing cavity, the guide seat divides the valve housing cavity into a water inlet end valve housing cavity, a central end valve housing cavity and a water outlet end valve housing cavity, the water inlet end valve housing cavity is connected with the water inlet end and is provided with a particle discharge control valve, the central end valve housing cavity is connected with a filter net backwashing discharge valve through a central discharge pipe, and the water outlet end valve housing cavity is connected with the water outlet end; the end of the backwashing mechanism is adapted to the central end valve housing cavity, and the backwashing mechanism can move axially relative to the filtering mechanism under the action of the pressure difference to switch the filtering mode and the backwashing mode;

[0008] The particle discharge control valve and the filter screen backwash discharge valve both adopt electric control valves or manual electric integrated control valves, and are both electrically connected to the controller.

[0009] The present invention realizes setting the water inlet end, the water outlet end, and the upward filter bottle assembly end on the valve head, and also sets two independent sewage valves, a particle sewage control valve, and a filter screen backwash sewage valve, 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 valve head structure is effectively optimized and adjusted. During filtration, the raw water flows into the raw water cavity between the filter mechanism and the filter bottle from the water inlet end and the water inlet end valve shell cavity in sequence, and after filtration, it flows out through the central end valve shell cavity, the water outlet end valve shell cavity and the water outlet end; large particle impurities accumulate in the water inlet end valve shell cavity, which can be directly discharged through the particle direct discharge control valve. In the backwash mode, the sewage backwashed on the filter screen enters the raw water cavity, and the raw water cavity is retained by the central sewage pipe to the filter screen backwash sewage valve for discharge. The structure is more optimized, easy to match the installation occasion, and has multiple sewage discharge channels to meet different application modes.

[0010] Preferably, a scraping mechanism is provided on the outside of the filtering mechanism, and the scraping mechanism includes a scraping frame and a scraping strip, and the scraping strip abuts against the inner wall of the filter bottle and / or the outer wall of the filtering mechanism. The scraping mechanism can rotate circumferentially relative to the filtering mechanism to scrape the inner wall of the filter bottle and / or the outer wall of the filtering mechanism, and the scraper is made of plastic, silicone or a brush.

[0011] Preferably, the filtering mechanism comprises a filtering skeleton and a filtering element, the filtering skeleton comprises a skeleton body, an inlet end cover and a skeleton bottom cover, the inlet end cover is provided with a raw water inlet channel and a backwashing skeleton assembly port, the skeleton bottom cover is provided with a backwashing skeleton assembly port; the backwashing mechanism comprises a backwashing skeleton and a backwashing filtering 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 from the backwashing skeleton assembly port, the backwashing filtering element is fixed to the backwashing section, the backwashing section is located in the central end valve shell cavity, and is slidingly sealed and connected to the central end valve shell cavity, the backwashing section is also provided with a sealing The backwash mechanism comprises a sealing part, wherein the sealing part can close or open the raw water inlet channel when the backwash mechanism moves axially; the driving section is fixedly provided with a backwash cover, and the backwash cover is provided with a backwash water hole; the driving section also comprises an elastic reset member, and the elastic reset member is provided between the skeleton body and the backwash skeleton, or between the backwash cover and the inner wall of the filter bottle, and under the action of the pressure difference on both sides of the backwash cover, the backwash mechanism is driven to move axially relative to the filtering mechanism; the backwash mechanism moves upward to close the raw water inlet channel, and the backwash section is exposed from the central end valve shell cavity to enter the backwash mode; the driving section moves downward to open the raw water inlet channel, and the backwash section extends into the central end valve shell cavity to enter the filtering mode.

[0012] Preferably, there is a pressure difference △P on both sides of the backwash cover, △P ≥ 0, when the action force corresponding to △P is greater than the reaction force of the elastic reset member, the elastic reset member is stretched or compressed, and the backwash mechanism moves axially upward in the direction opposite to the sewage flow; when the action force corresponding to △P is less than the reaction force of the elastic reset member, the elastic reset member is reset, and the backwash mechanism moves axially downward in the direction of the sewage flow; the size of the pressure difference △P is adjusted by opening and closing the backwash drain valve of the filter.

[0013] Preferably, the outlet valve housing cavity is also provided with a backwash filter flushing drain valve, the central valve housing cavity is provided with a backwash filter element flushing channel, the backwash filter element flushing drain valve adopts an electric control valve or a manual electric integrated control valve, and is electrically connected to the controller. In the backwash mode of the backwash filter, the sewage backwashed on the backwash filter enters the outlet valve housing cavity and is discharged through the backwash filter flushing drain valve, expanding multiple drain channels to meet different application modes.

[0014] 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.

[0015] Preferably, the guide seat is provided with a buffer wall in the valve housing cavity at the water inlet end, and a buffer zone is formed under the buffer wall. By setting the buffer wall and the buffer zone, large particle impurities are deposited when passing through and discharged through the particle discharge control valve, delaying the clogging of the filter element and improving the performance of the pre-filter.

[0016] Preferably, the buffer wall includes a blocking portion, an oblique flow guide portion and a vertical flow guide portion, and the junction of the blocking portion, the oblique flow guide portion and the vertical flow guide portion is in an arc transition. By changing the direction and velocity of the water flow, the effect of large particle impurity deposition is improved, the performance of the pre-filter is further improved, and its service life is extended.

[0017] Preferably, the guide seat is provided with a guide pipe in the valve shell cavity at the water outlet end, and the guide pipe is provided with a transition zone. Through the arrangement of the guide pipe and the transition zone, the purified water at the water outlet end can flow out stably, avoiding large flow rate and flow velocity fluctuations.

[0018] Preferably, the transition zone is in the form of an arc transition, and the axial direction of the flow guide tube is consistent with the axial direction of the water outlet. The setting of the arc transition zone and the axial direction being consistent can reduce the resistance of the purified water outflow, allowing the purified water at the water outlet to flow out stably and avoiding large flow and flow rate fluctuations.

[0019] Preferably, the guide seat is integrally formed of an 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, the inert material is plastic, rubber or ceramic.

[0020] Preferably, the guide seat is provided with an assembly part in the central end valve shell cavity, and the assembly part is adapted to the backwash section of the backwash filtration mechanism of the automatically controlled inverted backwash pre-filter, and the inner cavity of the filtration and backwash mechanism can be connected to the central end valve shell cavity.

[0021] Preferably, the water inlet end, the water outlet end and the filter bottle assembly end are provided with isolation bushings, and the isolation bushings are made of inert materials. The isolation bushings include an isolation bushing at the water inlet end, an isolation bushing at the water outlet end and an isolation bushing at the assembly end, which are integrally injection molded using plastic or rubber materials; or at least one side of the isolation bushing in contact with water is provided with an inert material coating, and the inert material is plastic, rubber or ceramic.

[0022] The beneficial effects of the present invention are as follows: the present invention realizes setting the water inlet end, the water outlet end, and the upward filter bottle assembly end on the valve head, and also sets two independent sewage valves, a particle sewage control valve, and a filter screen backwash sewage valve, that is, the function of the drainage ball valve originally set at the lower end of the filter bottle is to be transferred to the valve head, and the traditional valve head structure is effectively optimized and adjusted. During filtration, the raw water flows into the raw water cavity between the filter mechanism and the filter bottle from the water inlet end and the water inlet end valve shell cavity in sequence, and after filtration, it flows out through the central end valve shell cavity, the water outlet end valve shell cavity and the water outlet end; large particle impurities accumulate in the water inlet end valve shell cavity, which can be directly discharged through the particle direct discharge control valve. In the backwash mode, the sewage backwashed on the filter screen enters the raw water cavity, and the raw water cavity is retained through the central sewage pipe to the filter screen backwash sewage valve for discharge. The structure is more optimized, easy to match the installation occasion, and has multiple sewage discharge channels to meet different application modes. In the backwash mode of the backwash filter, the sewage that is backwashed on the backwash filter enters the valve shell cavity at the outlet end and is discharged through the backwash filter flushing drain valve, expanding multiple drain channels to meet different application modes. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the structure of the present invention;

[0026] Figure 3 It is a schematic diagram of the structure of the present invention;

[0027] Figure 4 It is a schematic diagram of the structure of the present invention;

[0028] Figure 5 It is a schematic diagram of the structure of the present invention;

[0029] Figure 6 is a cross-sectional view of the present invention (filtering state);

[0030] Figure 7 It is a cross-sectional view of the present invention (large particles are arranged in a straight line);

[0031] Figure 8 is a cross-sectional view of the present invention (backwashing filter element flushing and sewage discharge);

[0032] Fig. 9It is a cross-sectional view of the present invention showing direct particle discharge (backwashing and sewage discharge of the filter element).

[0033] In the figure: 1. valve housing, 11. water inlet end, 12. water outlet end, 13. filter bottle assembly end, 14. valve housing cavity, 14a. water inlet end valve housing cavity, 14b. central end valve housing cavity, 14c. water outlet end valve housing cavity, 14d. backwashing filtration cavity, 2. guide seat, 21. buffer wall, 22. buffer zone, 23. guide pipe, 24. transition zone, 3. particle discharge control valve, 4. central discharge pipe, 5. filter screen backwashing discharge valve, 6. backwashing filter screen flushing discharge valve, 7. filter bottle, 8. filter skeleton, 81. water inlet end cover, 82. skeleton bottom cover, 9. filter element, 10. backwashing skeleton, 10a. backwashing filter element, 10b. backwashing cover, 10c. sealing part, A. elastic reset part, B. scraping mechanism, C. controller, D. electric ball valve. DETAILED DESCRIPTION

[0034] Embodiments of the present invention are described in detail below, examples of which 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 are not to be construed as limitations of the present invention.

[0035] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated 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 should not be understood as a limitation on the present invention.

[0036] In the description of the present invention, 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.

[0037] 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.

[0038] Example 1

[0039] like Figure 1-9As shown, the automatically controlled inverted backwashing pre-filter comprises a controller, a valve housing 1, a filtering and backwashing mechanism and a filter bottle 7, wherein the valve housing 1 is provided with a water inlet end 11, a water outlet end 12, an upward filter bottle assembly end 13 and a valve housing cavity 14, the filter bottle 7 is fixedly matched with the filter bottle assembly end 13, the filtering and backwashing mechanism is arranged in the filter bottle 7, and the cavity between the filtering mechanism and the filter bottle 7 constitutes a raw water cavity, the filtering and backwashing mechanism comprises a coaxially arranged filtering mechanism and a backwashing mechanism, and is characterized in that: a guide seat 2 is arranged in the valve housing cavity 14, and the guide seat 2 The valve shell cavity 14 is divided 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 connected to the water inlet end 11 and is provided with a particle discharge control valve 3. The central end valve shell cavity 14b is connected to a filter screen backwashing discharge valve 5 through a central discharge pipe 4. The water outlet end valve shell cavity 14c is connected to the water outlet end 12. The end of the backwashing mechanism is adapted to the central end valve shell cavity 14b. The backwashing mechanism can move axially relative to the filtering mechanism under the action of the pressure difference to switch between the filtering mode and the backwashing mode.

[0040] The particle discharge control valve 3 and the filter backwash discharge valve 5 are both electric control valves (such as electric ball valve D) or manual electric integrated control valves, and are both electrically connected to the controller C.

[0041] In this embodiment, a scraping mechanism B is provided on the outside of the filtering mechanism, and the scraping mechanism B includes a scraping frame and a scraping strip. The scraping strip abuts against the inner wall of the filter bottle 7 and / or the outer wall of the filtering mechanism. The scraping mechanism B can rotate circumferentially relative to the filtering mechanism to scrape the inner wall of the filter bottle 7 and / or the outer wall of the filtering mechanism. The scraping strip is made of plastic, silicone or a brush.

[0042] The present invention realizes setting the water inlet end, the water outlet end, and the upward filter bottle assembly end on the valve head, and also sets two independent sewage valves, a particle sewage control valve, and a filter screen backwash sewage valve, 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 valve head structure is effectively optimized and adjusted. During filtration, the raw water flows into the raw water cavity between the filter mechanism and the filter bottle from the water inlet end and the water inlet end valve shell cavity in sequence, and after filtration, it flows out through the central end valve shell cavity, the water outlet end valve shell cavity and the water outlet end; large particle impurities accumulate in the water inlet end valve shell cavity, which can be directly discharged through the particle direct discharge control valve. In the backwash mode, the sewage backwashed on the filter screen enters the raw water cavity, and the raw water cavity is retained by the central sewage pipe to the filter screen backwash sewage valve for discharge. The structure is more optimized, easy to match the installation occasion, and has multiple sewage discharge channels to meet different application modes.

[0043] Specifically, the filtering mechanism includes a filtering skeleton 8 and a filtering element 9. The filtering skeleton includes a skeleton body, an inlet end cover 81 and a skeleton bottom cover 82. The inlet end cover 81 is provided with a raw water inlet channel and a backwashing skeleton assembly port, and the skeleton bottom cover 82 is provided with a backwashing skeleton assembly port; 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, and the backwashing section and the driving section extend from the backwashing skeleton assembly port. 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 slidably sealed with the central end valve shell cavity 14b. The backwashing section is also provided with a sealing The backwashing mechanism is provided with a sealing portion 10c, and the raw water inlet channel can be closed or opened through the sealing portion 10c when the backwashing mechanism moves axially; the driving section is fixedly provided with a backwashing cover 10b, and the backwashing cover 10b is provided with a backwashing water hole; it also includes an elastic reset member A, and the elastic reset member A 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 7. 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; it moves upward to close the raw water inlet channel, and the backwashing section is exposed from the central end valve shell cavity 14b to enter the backwashing mode; it moves downward to open the raw water inlet channel, and the backwashing section extends into the central end valve shell cavity 14b to enter the filtering mode.

[0044] In this embodiment, there is a pressure difference △P on both sides of the backwash cover 10b, △P≥0, when the action force corresponding to △P 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 axially upward in the direction opposite to the sewage flow; when the action force corresponding to △P is less than the reaction force of the elastic reset member A, the elastic reset member A is reset, and the backwash mechanism moves axially downward in the direction of the sewage flow; the size of the pressure difference △P is adjusted by opening and closing the filter backwash drain valve 5.

[0045] In this embodiment, the outlet valve shell cavity 14c is also provided with a backwash filter cavity 14d, and the backwash filter cavity 14d is provided with a backwash filter element flushing sewage channel 6, and the backwash filter element flushing sewage valve 6 adopts an electric control valve or a manual electric integrated control valve, and is electrically connected to the controller C; in the backwash mode of the backwash filter, the sewage that is backwashed on the backwash filter enters the outlet valve shell cavity, and is discharged through the backwash filter flushing sewage valve, thereby expanding multiple sewage channels to meet different application modes. 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 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 clogged by residual impurities, it is easy to disassemble and clean.

[0046] More specifically, the guide seat 2 is provided with a buffer wall 21 at the valve shell cavity 14a at the water inlet end, and a buffer zone 22 is formed under the buffer wall 21. Through the setting of the buffer wall and the buffer zone, large particle impurities are allowed to settle when passing through, and are discharged through the particle discharge control valve, delaying the clogging of the filter element and improving the performance of the pre-filter. The buffer wall 21 includes a blocking portion, an oblique flow guide portion and a vertical flow guide portion, and the junction of the blocking portion, the oblique flow guide portion and the vertical flow guide portion is in an arc transition. Through the change of the water flow direction and flow velocity, the effect of the deposition of large particle impurities is improved, the performance of the pre-filter is further improved, and its service life is extended. The guide seat 2 is provided with a guide pipe 23 at the valve shell cavity 14c at the water outlet end, and the guide pipe 23 is provided with a transition zone 24. Through the setting of the guide pipe and the transition zone, the purified water at the water outlet can flow out stably to avoid large flow and flow velocity fluctuations.

[0047] In this embodiment, the transition zone 24 is an arc transition, and the axial direction of the flow guide tube 23 is consistent with the axial direction of the water outlet 12. The setting of the arc transition zone and the axial direction being consistent can reduce the resistance of the purified water outflow, allowing the purified water at the water outlet to flow out stably and avoiding large flow rate and flow velocity fluctuations.

[0048] In this embodiment, in order to improve the environmental friendliness of the valve head, the guide seat is integrally formed of an 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, the inert material is plastic, rubber or ceramic.

[0049] Specifically, the guide seat 2 is provided with an assembly part in the central end valve shell cavity 14b, and the assembly part is adapted to the backwash section of the backwash filtration mechanism of the automatically controlled inverted backwash pre-filter, and the inner cavity of the filtration and backwash mechanism can be connected 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, which are made of inert materials. The isolation bushings include the water inlet end isolation bushing, the water outlet end isolation bushing and the assembly end isolation bushing, which are integrally injection molded with plastic or rubber materials; or the isolation bushing is provided with an inert material coating on at least one side in contact with water, and the inert material is plastic, rubber or ceramic.

[0050] The present invention realizes setting the water inlet end, the water outlet end, and the upward filter bottle assembly end on the valve head, and also sets two independent sewage valves, a particle sewage control valve, and a filter screen backwash sewage valve, 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 valve head structure is effectively optimized and adjusted. During filtration, the raw water flows into the raw water cavity between the filter mechanism and the filter bottle from the water inlet end and the water inlet end valve shell cavity in sequence, and after filtration, it flows out through the central end valve shell cavity, the water outlet end valve shell cavity and the water outlet end; large particle impurities accumulate in the water inlet end valve shell cavity, which can be directly discharged through the particle direct discharge control valve. In the backwash mode, the sewage backwashed on the filter screen enters the raw water cavity, and the raw water cavity is retained by the central sewage pipe to the filter screen backwash sewage valve for discharge. The structure is more optimized, easy to match the installation occasion, and has multiple sewage discharge channels to meet different application modes. In the backwash mode of the backwash filter, the sewage that is backwashed on the backwash filter enters the valve shell cavity at the outlet end and is discharged through the backwash filter flushing drain valve, expanding multiple drain channels to meet different application modes.

[0051] The above-described embodiment is only a preferred solution of the present invention and does not limit the present invention in any form. There are other variations and modifications without exceeding the technical solution described in the claims.

Claims

1. An automatically controlled inverted backwashing pre-filter, comprising a controller (C), a valve housing (1), a filtering and backwashing mechanism and a filter bottle (7), wherein the valve housing (1) is provided with a water inlet end (11), a water outlet end (12), an upwardly directed filter bottle assembly end (13) and a valve housing cavity (14), the filter bottle (7) and the filter bottle assembly end (13) are fixed in cooperation, the filtering and backwashing mechanism is arranged in the filter bottle (7), the filtering and backwashing mechanism comprises a coaxially arranged filtering mechanism and a backwashing mechanism, the cavity between the filtering mechanism and the filter bottle (7) constitutes a raw water cavity, and the characteristics are as follows: A flow guide seat (2) is provided in the valve housing cavity (14), and the flow guide seat (2) divides the valve housing cavity (14) into a water inlet end valve housing cavity (14a), a central end valve housing cavity (14b) and a water outlet end valve housing cavity (14c); the water inlet end valve housing cavity (14a) is connected to the water inlet end (11) and is provided with a particle discharge control valve (3); the central end valve housing cavity (14b) is connected to a filter screen backwashing discharge valve (5) through a central discharge pipe (4); and the water outlet end valve housing cavity (14c) is connected to the water outlet end (12); the end of the backwashing mechanism is adapted to the central end valve housing cavity (14b); the backwashing mechanism can move axially relative to the filtering mechanism under the action of a pressure difference to switch between a filtering mode and a backwashing mode; The particle discharge control valve (3) and the filter screen backwash discharge valve (5) are both electric control valves or manual electric integrated control valves, and are both electrically connected to the controller (C).

2. The automatically controlled inverted backwash pre-filter according to claim 1 is characterized in that: The filter mechanism is externally sleeved with a scraping mechanism (B), the scraping mechanism (B) comprising a scraping frame and a scraping strip, the scraping strip abutting against the inner wall of the filter bottle (7) and / or the outer wall of the filter mechanism, the scraping mechanism (B) can rotate circumferentially relative to the filter mechanism to scrape the inner wall of the filter bottle (7) and / or the outer wall of the filter mechanism, and the scraping strip is made of plastic, silica gel or a brush.

3. The automatically controlled inverted backwash pre-filter according to claim 1 or 2, characterized in that: The filtering mechanism comprises a filtering frame (8) and a filtering element (9), wherein the filtering frame (8) comprises a frame body, a water inlet end cover (81) and a frame bottom cover (82), wherein the water inlet end cover (81) is provided with a raw water inlet channel and a backwashing frame assembly port, and the frame bottom cover (82) is provided with a backwashing frame assembly port; the backwashing mechanism comprises a backwashing frame (10) and a backwashing filtering element (10a), wherein the backwashing frame (10) is provided with a backwashing section, an assembly section and a driving section, wherein the assembly section is inserted into the frame body, the backwashing section and the driving section extend from the backwashing frame assembly port, 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 slidably sealed and connected to the central end valve shell cavity (14b), and the backwashing section is also provided with a backwashing section. The backwash mechanism comprises a sealing portion (B), and the sealing portion (B) can close or open the raw water inlet channel when the backwash mechanism moves axially; the driving section is fixedly provided with a backwash cover (10b), and the backwash cover (10b) is provided with a backwash water hole; and also comprises an elastic reset member (A), and the elastic reset member (A) is provided between the skeleton body and the backwash skeleton (10), or between the backwash cover (10b) and the inner wall of the filter bottle, and under the action of the pressure difference on both sides of the backwash cover (10b), the backwash mechanism is driven to move axially relative to the filtering mechanism; it moves upward to close the raw water inlet channel, and the backwash section is exposed from the central end valve shell cavity (14b), and enters the backwash mode; it moves downward to open the raw water inlet channel, and the backwash section extends into the central end valve shell cavity (14b), and enters the filtering mode.

4. The automatically controlled inverted backwash pre-filter according to claim 3 is characterized in that: There is a pressure difference △P on both sides of the backwash cover (10b), △P≥0, when the action force corresponding to △P 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 axially upward in the direction opposite to the sewage flow; when the action force corresponding to △P is less than the reaction force of the elastic reset member (A), the elastic reset member (A) is reset, and the backwash mechanism moves axially downward in the direction of the sewage flow; the size of the pressure difference △P is adjusted by opening and closing the filter screen backwash drain valve (5).

5. The automatically controlled inverted backwashing pre-filter according to claim 3 is characterized in that: The outlet valve shell cavity (14c) is also provided with a backwash filter cavity (14d), and the backwash filter cavity (14d) is provided with a backwash filter element flushing and drainage channel (6), and the central valve shell cavity (14b) is provided with a backwash filter element (10a) flushing channel, and the backwash filter element flushing and drainage valve (6) adopts an electric control valve or a manual electric integrated control valve, and is electrically connected to the controller (C); 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.

6. The automatically controlled inverted backwash pre-filter according to claim 3 is characterized in that: The filter skeleton (8) is a filter mesh skeleton, and the filter element (9) is a filter mesh or PP cotton; the backwash skeleton (10) is a backwash filter mesh skeleton, and the backwash filter element (10a) is a filter mesh or PP cotton; or, the filter skeleton (8) and the backwash skeleton (10) are both laminated skeletons, and the filter element (9) and the backwash filter element (10a) are both filter laminates.

7. The automatically controlled inverted backwash pre-filter according to claim 1 or 2, characterized in that: The guide seat (2) is provided with a buffer wall (21) at the water inlet end valve housing cavity (14a), and a buffer zone (22) is formed under the buffer wall (21).

8. The automatically controlled inverted backwash pre-filter according to claim 7, characterized in that: The buffer wall (21) comprises a blocking portion, an oblique flow guide portion and a vertical flow guide portion, and the junction of the blocking portion, the oblique flow guide portion and the vertical flow guide portion is in an arc transition.

9. The automatically controlled inverted backwash pre-filter according to claim 8, characterized in that: The flow guide seat (2) is provided with a flow guide pipe (23) in the valve shell cavity (14c) at the water outlet end, and the flow guide pipe (23) is provided with a transition zone (24); the transition zone (24) is in the form of an arc transition, and the axial direction of the flow guide pipe (23) is consistent with the axial direction of the water outlet end (12).

10. The automatically controlled inverted backwash pre-filter according to claim 1, 2 or 3, characterized in that: The guide seat is integrally formed of an inert material, wherein the inert material is rubber or plastic, or at least one side in contact with water is provided with an inert material coating, wherein the inert material is plastic, rubber or ceramic; the water inlet end (11), the water outlet end (12) and the filter bottle assembly end (13) are provided with isolation bushings, wherein the isolation bushings are processed with inert materials, the isolation bushings include an inlet end isolation bushing, an outlet end isolation bushing and an assembly end isolation bushing, and are integrally injection molded with plastic or rubber materials; or at least one side in contact with water is provided with an inert material coating, wherein the inert material is plastic, rubber or ceramic; the guide seat (2) is provided with an assembly portion located in the central end valve shell cavity (14b), wherein the assembly portion is adapted to the backwashing section of the backwashing filtering mechanism of the automatically controlled inverted backwashing pre-filter, and the inner cavity of the filtering and backwashing mechanism can be connected to the central end valve shell cavity (14b).

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