Backwash pre-filter with built-in check valve

Abstract

The backwashing pre-filter comprises a valve head, a filter bottle, a filter mechanism and a backwashing mechanism, the bottom of the filter bottle is provided with a pollution discharge assembly, the backwashing pre-filter is further provided with a controller, the valve head is provided with a check valve assembly cavity, the check valve is arranged in the check valve assembly cavity, the check valve comprises a valve body and a check adjusting structure, the check valve assembly cavity is internally provided with a check flow channel, and the check flow channel is communicated with the filter mechanism. The valve body comprises a driving part and a non-return part, the non-return part is matched with the non-return flow channel, the non-return adjusting mechanism is fixed to the driving part, and the non-return adjusting mechanism can drive the driving part to drive the non-return part to close or open the non-return flow channel under the action of water pressure in the prefilter; an adjusting structure is arranged between the backwashing mechanism and the filtering mechanism, the backwashing mechanism can axially move relative to the filtering mechanism through the matching of the adjusting structure, and the controller is preset with a water use time range T and can record the opening duration t of the non-return flow channel. The device is simple in structure, and reliable non-return, water leakage monitoring and backwashing control are realized.

Description

Technical Field

[0001] The invention relates to a backwashing pre-filter with a built-in check valve, belonging to the technical field of water purification equipment. Background Art

[0002] The mainstream products of the external pressure pre-filter in the prior art are of the filter bottle bottom type, including: a valve head, a filter bottle connected to the valve head at the upper end, 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 valve 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 valve 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] This pre-filter structure has the following shortcomings:

[0004] 1. When the pre-filter is discharging sewage, there is a possibility that the water in the outlet pipe will return and cause air to enter, so a check valve structure is required. A check valve is a valve, also called a non-return valve or a reverse valve, and its main function is to prevent the fluid from flowing back in the pipe. When the flow direction of the fluid in the pipe changes, the check valve will automatically close to prevent the fluid from flowing back, thereby protecting the safety of the pipe and equipment. The check valve in the prior art usually consists of a valve body, a valve cover, a valve seat and a sealing seat, etc., and the installation position is set in the water inlet pipe and the water outlet pipe. However, the space for the water inlet port and the water outlet port of the pre-filter valve head is limited, and in the pre-filter with automated intelligent control, the valve head integrates a controller, a drive motor and a flow detection mechanism, etc., and the installation of conventional check valves is limited. However, there is extra space inside the valve head in the water path from the center of the filter mesh skeleton to the water outlet of the valve head to install the check valve structure;

[0005] 2. The filter screen of the filter mechanism will be clogged after long-term use, so it needs to be cleaned regularly. The cleaning method includes flushing the outer wall of the filter element with raw water while discharging sewage and backwashing the outer wall of the filter element from the inside to the outside while discharging sewage. Among them, backwashing is the mainstream direction of current technical research and development, with high flushing efficiency. The backwashing structure is coaxially arranged with the filter mechanism, and the opening and closing of the backwashing structure are controlled by axial movement, which has been well applied. However, in the prior art, the control of the cleaning time is not intelligent enough. Usually, the cleaning time is preset, the sewage is cleaned, or the sewage is cleaned from time to time manually according to the situation. It is impossible to scientifically and accurately judge the blockage state of the filter screen of the filter mechanism, which affects the use effect of the pre-filter;

[0006] 3. In addition, when the pipeline of the pre-filter leaks, it is also necessary to promptly feedback the abnormal water usage status. The pre-filter of the prior art usually uses Hall flow sensors and ultrasonic flow sensors to monitor pipeline leakage, but they are relatively expensive. The present invention is based on the setting of the check valve. By comparing the continuous opening time of the check valve with the preset time of the controller, the water usage status is determined, and the user is reminded in time, thereby realizing dynamic water leakage monitoring in a low-cost manner. Summary of the invention

[0007] The present invention aims to provide a pre-filter with a more optimized structure, including a valve head structure with a built-in check valve, wherein the check valve is arranged in the water path from the center of the filter mesh skeleton to the water outlet of the valve head. When the pre-filter is discharging sewage, reliable check control is realized to avoid the entry of air due to the backflow of water in the water outlet pipe, and the installation of other intelligent control components of the valve head is not affected. By reasonably setting the pressure sensor and the value change of the pre-filter pressure sensor, the cleaning timing of the filter mesh can be accurately evaluated. In addition, a leakage monitoring mechanism is provided to compare the opening duration t of the check valve with the preset household common water time range T. When the opening duration t of the check valve is abnormal, it is most likely a leakage state, and feedback or reminder will be given to the user in time. In addition, a backwashing mechanism is provided, which can automatically and efficiently backwash the filter element when needed, thereby improving the use effect of the pre-filter and greatly extending its service life.

[0008] The technical solution adopted by the present invention to solve its technical problem is:

[0009] The backwash pre-filter with a built-in check valve comprises a valve head with an inlet port, an outlet port and a filter bottle assembly port. The filter bottle assembly port is equipped with a filter bottle. A filtering mechanism and a backwashing mechanism are coaxially arranged in the filter bottle. A sewage discharge component is arranged at the bottom of the filter bottle, and a controller is also arranged. A backwashing adjustment structure is arranged between the backwashing mechanism and the filtering mechanism. Through the cooperation of the backwashing adjustment structure, the backwashing mechanism can move axially relative to the filtering mechanism. When moving toward the sewage discharge end, the water inlet channel of the filtering mechanism can be closed and the water inlet channel of the backwashing mechanism can be opened to reversely wash the filter element; when moving away from the sewage discharge end, the backwashing adjustment structure can be opened. Close the water inlet channel of the backwash mechanism and open the water inlet channel of the filtering mechanism. The valve head is located in the center of the filtering mechanism and the backwash mechanism. A check valve assembly cavity is provided in the water channel of the water outlet channel flowing to the valve head from the center of the valve head. A check valve is provided in the check valve assembly cavity. The check valve includes a valve body and a check adjustment structure. A check flow channel is provided in the check valve assembly cavity. The valve body includes a driving part and a check part. The check part is adapted to the check flow channel. The check adjustment structure is provided in the driving part. The check adjustment mechanism can drive the driving part to drive the check part to close or open the check flow channel under the action of the water pressure inside the pre-filter.

[0010] The present invention is provided with a built-in check valve with a simple structure and is easy to install. It is arranged in a check valve assembly cavity in a water channel of a water outlet channel from the center of a filtering mechanism and a backwashing mechanism to a valve head. When the front filter is discharging sewage, reliable check valve control is achieved to avoid the backflow of water in the water outlet pipe and the entry of air. It has little impact on the structure of the valve head of the prior art, does not affect the installation of other intelligent control components of the valve head, and can realize the backwashing function.

[0011] Preferably, the controller is preset with a water use time range T, and can record the duration t of the check flow channel being open. By comparing the opening duration t of the check valve with the preset household common water time range T, when the opening duration t of the check valve is abnormal, it is likely to be a leakage state, and feedback or reminders will be given to the user in a timely manner, realizing dynamic water leakage monitoring in a low-cost manner.

[0012] Preferably, the filter mechanism comprises a filter frame and a filter unit, the backwash mechanism comprises a backwash frame and a backwash unit, the backwash mechanism is inserted in the filter mechanism, the backwash frame comprises a backwash function section and an assembly section, and the assembly section is also fixedly provided with a backwash opening cover; a raw water chamber is provided between the filter mechanism and the filter bottle, a purified water chamber is formed inside the filter mechanism, the raw water chamber and the purified water chamber are connected through the filter channel of the filter unit, the purified water chamber is connected with the water outlet port, one end of the raw water chamber is connected with the water inlet port through the water inlet channel, and the other end is connected with the sewage discharge chamber of the sewage discharge part; the water inlet channel of the backwash mechanism is provided in the backwash unit and is located in the adjustment cover, the backwash adjustment structure is an elastic reset member, and the backwash opening cover is provided with a plurality of backwash drainage holes;

[0013] There is a pressure difference △P on both sides of the backwash opening cover, △P≥0. When the action force corresponding to △P is greater than the reaction force of the elastic reset part, the elastic reset part is compressed, the backwash mechanism moves axially in the direction of sewage flow, and the water inlet channel of the backwash mechanism extends from the adjusting cover; when the action force corresponding to △P is less than the reaction force of the elastic reset part, the elastic reset part is reset, the backwash mechanism moves axially in the direction opposite to the sewage flow, and the water inlet channel of the backwash mechanism penetrates into the adjusting cover.

[0014] The pressure difference on both sides of the backwashing opening cover is used to drive the backwashing mechanism to move axially relative to the filtering mechanism, which is easy to operate and saves energy.

[0015] Preferably, it further comprises a valve seat, the valve housing is disposed in the valve seat, a valve sleeve is provided between the valve seat and the valve housing, and the check portion opens or closes the check flow channel through cooperation with the valve sleeve.

[0016] Preferably, the water inlet channel and the water outlet channel are both provided with pressure sensors, and the pressure sensors can be electrically connected to the controller of the pre-filter.

[0017] Working principle: When the product is in normal use, the filter element will gradually become clogged, and the clogging will become more and more serious. The pressure difference between the water inlet channel and the water outlet channel will become larger and larger. When the pressure difference reaches the preset pressure difference value, the controller controls the sewage discharge component to open, automatically flush and discharge sewage. After flushing and drainage are completed, the controller controls the sewage discharge component to close again.

[0018] Preferably, the controller can be connected to a remote server or a user terminal via wireless communication, and the controller is provided with a remote communication unit, which includes a wireless communication module electrically connected to a circuit board of the controller.

[0019] Preferably, the controller has a processor function, and the wireless communication module is any one of a 2G module, a 3G module, a 4G module, a 5G module and a WiFi module, or a combination of two thereof; the remote server and the user terminal can receive information or remotely control the controller through the wireless communication module; at least one MCU is integrated on the circuit board of the controller, and the operation of the components electrically connected thereto is controlled by the MCU, and the wireless communication module is also integrated on the circuit board of the controller.

[0020] Preferably, the sewage discharge assembly includes an electrically controlled sewage discharge valve and a drive motor, both of which are electrically connected to a controller, and the controller controls the rotation of the drive motor to realize the opening and closing of the electrically controlled sewage discharge valve.

[0021] Preferably, the valve housing is provided with a water inlet end and a check end, the check flow channel connects the water inlet end and the check end, an extrusion seal can be formed or released between the check end and the check part, and the check regulating mechanism controls the formation and release of the extrusion seal under the action of the water pressure inside the pre-filter, thereby closing or opening the check flow channel.

[0022] Preferably, the driving part is a valve stem, the check part is a valve plug, and the check adjustment structure is an elastic reset element. One end of the elastic reset element is fixed or abutted with the valve stem, and the other end can be fixed or abutted with the valve head of the pre-filter. The valve plug can move axially under the drive of the elastic reset element, thereby closing or opening the check flow channel.

[0023] Preferably, the valve head is further provided with a guide groove, and the end of the valve stem and the non-return adjustment structure are both arranged in the guide groove.

[0024] Preferably, the driving part is a valve stem, the check part is a valve plug, and the check adjustment structure is an elastic reset element. One end of the elastic reset element is fixed or abutted with the valve stem or the valve plug, and the other end is fixed or abutted with the valve seat. The valve seat is provided with a guide hole for axial movement of the valve stem, and the valve plug can move axially under the drive of the elastic reset element.

[0025] Preferably, the valve housing is provided with at least one limiting portion A at the water inlet end and at least one limiting portion B at the water outlet end. The limiting portion A is used to limit and fix the valve housing and the pre-filter valve head, and the limiting portion B is used to control the axial movement distance of the valve plug when closing the non-return flow channel, so as to fully form an extrusion seal.

[0026] Preferably, the limiting portion A is a limiting boss derived from the outer circumference, the limiting portion B is a limiting boss derived from the inner circumference, and the valve plug has a conical structure.

[0027] Preferably, the limiting portion A, the limiting portion B and the valve housing are integrally formed.

[0028] Preferably, the built-in check valve structure is further provided with a displacement sensor, and the driving unit is further provided with a magnetic induction element, which can conduct the displacement sensor through magnetic force and send a signal of the check valve operation to the controller of the pre-filter.

[0029] Preferably, the water inlet channel, water outlet channel and filter bottle assembly port are provided with isolation bushings, and the isolation bushings, valve housing and valve body are made of inert materials or at least the side in contact with water is provided with an inert material coating, and the inert material is plastic, rubber or ceramic.

[0030] Preferably, the valve housing and the valve body are respectively integrally injection molded with plastic or rubber materials; the isolation bushing comprises 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 with plastic or rubber materials.

[0031] Preferably, the filter skeleton and the backwash skeleton are filter skeletons, and the filter elements and the backwash elements are filter meshes or PP cotton or filter membranes; or the filter skeleton is a laminate skeleton, the backwash skeleton is a filter skeleton, the filter element is a filter laminate, and the backwash element is a filter mesh or PP cotton or filter membrane.

[0032] Preferably, the filtering mechanism is also provided with a water hammer prevention structure.

[0033] The beneficial effects of the present invention are as follows: a pre-filter with a more optimized structure is provided, comprising a valve head structure with a built-in check valve, wherein the check valve is arranged in the water path from the center of the filter mesh skeleton to the water outlet of the valve head, and when the pre-filter is discharging sewage, reliable check control is achieved to avoid the entry of air due to the backflow of water in the water outlet pipe, and the installation of other intelligent control components of the valve head is not affected, and by reasonably setting the pressure sensor and the value change of the pre-filter pressure sensor, the cleaning timing of the filter mesh can be accurately evaluated, and a leakage monitoring mechanism is also provided to compare the opening duration t of the check valve with the preset household common water time range T. When the opening duration t of the check valve is abnormal, it is most likely a leakage state, and feedback or reminder will be given to the user in time, and in addition, a backwashing mechanism is provided, which can automatically and efficiently backwash the filter element when needed, thereby improving the use effect of the pre-filter and greatly extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] 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.

[0035] Figure 1 is an exploded view of the check valve of the present invention;

[0036] Figure 2 yes Figure 1 Partial exploded view;

[0037] Figure 3 yes Figure 1 Schematic diagram of the combination;

[0038] Figure 4 It is a structural schematic diagram of the valve head of the present invention;

[0039] Figure 5 yes Figure 4 A partial cross-sectional view of

[0040] Figure 6 is a cross-sectional view of the valve head of the present invention in use state (valve opening state);

[0041] Figure 7 It is a cross-sectional view of the valve head of the present invention in the use state (valve closed state);

[0042] Figure 8 It is a schematic diagram of the structure of the present invention;

[0043] Fig. 9 yes Figure 8 A cross-sectional view of

[0044] Fig.10 is a cross-sectional view of the present invention (filtering state);

[0045] Fig.11 It is a cross-sectional view of the present invention (drainage state).

[0046] In the figure: 1. valve housing, 11. water inlet end, 12. check end, 2. valve body, 21. valve stem, 22. valve plug, 3. check adjustment structure, 4. valve seat, 5. valve sleeve, 6. limit part A, 7. limit part B, 8. displacement sensor, 9. magnetic induction element, A valve head, B. check valve assembly chamber, E. pressure sensor, F. guide groove, G. filter bottle, H. electric control drain valve, I. filtering mechanism, J. backwashing mechanism, K. adjusting cover, L. backwashing opening cover, M. backwashing adjustment structure, N. anti-water hammer structure. DETAILED DESCRIPTION

[0047] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] like Figure 1-11As shown, a backwash pre-filter with a built-in check valve comprises a valve head A with a water inlet port, a water outlet port and a filter bottle assembly port, the filter bottle assembly port is equipped with a filter bottle G, a filtering mechanism I and a backwashing mechanism J are coaxially arranged in the filter bottle G, a sewage discharge assembly is arranged at the bottom of the filter bottle G, and a controller is also provided: the valve head A is located in the center of the filtering mechanism I and the backwashing mechanism J, and a check valve assembly cavity B is arranged in the water channel flowing to the water outlet channel of the valve head A, the check valve is arranged in the check valve assembly cavity B, the check valve comprises a valve housing 1, a valve body 2 and a check valve regulating structure 3, a check flow channel is arranged in the valve housing 1, the valve body 2 comprises a driving part and a check part, the check part is adapted to the check flow channel, the check adjustment structure 3 is arranged in the driving part, and the check adjustment mechanism 3 can drive the driving part to drive the check part to close or open the check flow channel under the action of the water pressure inside the pre-filter;

[0052] A backwashing adjustment structure M is provided between the backwashing mechanism I and the filtering mechanism J. Through the cooperation of the backwashing adjustment structure M, the backwashing mechanism J can move axially relative to the filtering mechanism I. When moving toward the sewage discharge end, the water inlet channel of the filtering mechanism I can be closed and the water inlet channel of the backwashing mechanism J can be opened to reversely wash the filter element; when moving away from the sewage discharge end, the water inlet channel of the backwashing mechanism J can be closed and the water inlet channel of the filtering mechanism I can be opened;

[0053] The controller is preset with a water use time range T, and can record the duration t of the check flow channel being open. By comparing the opening duration t of the check valve with the preset household common water time range T, when the opening duration t of the check valve is abnormal, it is likely to be a leakage state, and feedback or reminders will be given to the user in a timely manner, realizing dynamic water leakage monitoring in a low-cost manner.

[0054] Specifically, the filtering mechanism I includes a filtering skeleton and a filtering unit, the backwashing mechanism J includes a backwashing skeleton and a backwashing unit, the backwashing mechanism J is inserted in the filtering mechanism I, the backwashing skeleton includes a backwashing function section and an assembly section, and the assembly section is also fixed with a backwashing opening cover L; a raw water cavity is provided between the filtering mechanism I and the filter bottle G, and a purified water cavity is formed inside the filtering mechanism I, the raw water cavity and the purified water cavity are connected through the filtering channel of the filtering element, the purified water cavity is connected with the water outlet, one end of the raw water cavity is connected with the water inlet port through the water inlet channel, and the other end is connected with the sewage discharge cavity of the sewage discharge part; the water inlet channel of the backwashing mechanism J is provided in the backwashing unit and is located in the adjustment cover K, the backwashing adjustment structure M is an elastic reset member, which is provided between the backwashing mechanism J and the filtering mechanism I, specifically between the assembly section and the backwashing opening cover L, and the backwashing opening cover L is provided with a plurality of backwashing drainage holes;

[0055] There is a pressure difference △P on both sides of the backwash opening cover L, △P≥0. When the action force corresponding to △P is greater than the reaction force of the elastic reset part, the elastic reset part is compressed, the backwash mechanism J moves axially in the direction of sewage flow, and the water inlet channel of the backwash mechanism J extends out from the adjusting cover; when the action force corresponding to △P is less than the reaction force of the elastic reset part, the elastic reset part is reset, the backwash mechanism J moves axially in the opposite direction of sewage flow, and the water inlet channel of the backwash mechanism J penetrates into the adjusting cover K.

[0056] In this embodiment, a valve seat 4 is also included, the valve housing 1 is placed in the valve seat 4, a valve sleeve 5 is provided between the valve seat 4 and the valve housing 1, the check portion opens or closes the check flow channel through the cooperation of the valve sleeve 5, the water inlet channel and the water outlet channel are both provided with a pressure sensor E, the pressure sensor E can be electrically connected to the controller, the controller can be connected to a remote server or a user terminal through wireless communication, the controller is provided with a remote communication unit, the remote communication unit includes a wireless communication module electrically connected to the circuit board of the controller, the controller has a processor function, the wireless communication module is any one of a 2G module, a 3G module, a 4G module, a 5G module and a WiFi module or a combination of two, the remote server and the user terminal can receive information or remotely control the controller through the wireless communication module; at least one MCU is integrated on the circuit board of the controller, the operation of the components electrically connected to it is controlled by the MCU, and the wireless communication module is also integrated on the circuit board of the controller, the sewage discharge component includes an electrically controlled sewage discharge valve H and a drive motor, both of which are electrically connected to the controller, and the operation of the drive motor is controlled by the controller to realize the opening and closing of the electrically controlled sewage discharge valve H.

[0057] Specifically, in this embodiment, the valve housing 1 is provided with a water inlet end 11 and a check end 12, the check flow channel connects the water inlet end 11 and the check end 12, an extrusion seal can be formed or released between the check end 12 and the check portion, and the check regulating mechanism 3 controls the formation and release of the extrusion seal under the action of the water pressure inside the pre-filter, thereby closing or opening the check flow channel.

[0058] In this embodiment, the driving part is the valve stem 21, the non-return part is the valve plug 22, and the non-return adjustment structure 3 is an elastic reset element. One end of the elastic reset element is fixed or abutted with the valve stem 21 or the valve plug 22, and the other end can be fixed or abutted with the valve head A of the pre-filter. The valve plug 22 can move axially under the drive of the elastic reset element, thereby closing or opening the non-return flow channel. The valve head A is also provided with a guide groove F, and the driving part of the valve body 2 and the non-return adjustment structure 3 are both arranged in the guide groove F.

[0059] As a parallel implementation scheme, the driving part is the valve stem 21, the non-return part is the valve plug 22, the non-return adjustment structure 3 is an elastic reset element, one end of the elastic reset element is fixed or abutted with the valve stem 21 or the valve plug 22, and the other end is fixed or abutted with the valve seat 4. The valve seat 4 is provided with a guide hole 41 for axial movement of the valve stem 21, and the valve plug 22 can move axially under the drive of the elastic reset element.

[0060] The above two parallel schemes can also be used in combination to maximize the adjustment effect.

[0061] In this embodiment, the valve housing 1 is provided with at least one limiting portion A6 at the water inlet end 11, and is provided with at least one limiting portion B7 at the water outlet end 12. The limiting portion A6 is used to limit and fix the valve housing 1 and the pre-filter valve head, and the limiting portion B7 is used to control the axial movement distance of the valve plug 22 when closing the non-return flow channel, so as to fully form an extrusion seal.

[0062] In this embodiment, the limiting portion A6 is a limiting boss derived from the outer circumference, the limiting portion B7 is a limiting boss derived from the inner circumference, and the valve plug 22 has a conical structure.

[0063] In this embodiment, the limiting portion A6 and the limiting portion B7 are integrally formed with the valve housing 1 .

[0064] In this embodiment, the built-in check valve structure is further provided with a displacement sensor 8, and the driving unit is further provided with a magnetic sensing element 9. The magnetic sensing element 9 can conduct the displacement sensor 8 through magnetic force and send a check valve operation signal to the controller of the pre-filter.

[0065] In this embodiment, the water inlet channel, water outlet channel and filter bottle assembly port are provided with isolation bushings, and the isolation bushings, valve housing 1 and valve body 2 are made of inert materials or at least the side in contact with water is provided with an inert material coating, and the inert material is plastic, rubber or ceramic.

[0066] In this embodiment, the valve housing 1 and the valve body 2 are respectively integrally injection molded of plastic or rubber materials; the isolation bushing includes an inlet end isolation bushing, an outlet end isolation bushing and an assembly end isolation bushing, which are integrally injection molded of plastic or rubber materials.

[0067] In this embodiment, the filtering skeleton and the backwashing skeleton are filter mesh skeletons, and the filtering elements and the backwashing elements are filter meshes or PP cotton or filter membranes; or the filtering skeleton is a laminated skeleton, the backwashing skeleton is a filter mesh skeleton, the filtering element is a filter laminate, and the backwashing element is a filter mesh or PP cotton or filter membrane, and the filtering mechanism I is also provided with a water hammer prevention structure N.

[0068] 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. A backwash pre-filter with a built-in check valve, comprising a valve head (A) with a water inlet port, a water outlet port and a filter bottle assembly port, the filter bottle assembly port being equipped with a filter bottle (G), a filter mechanism (I) and a backwash mechanism (J) being coaxially arranged in the filter bottle (G), and a controller being further arranged, a backwash adjustment structure (M) being arranged between the backwash mechanism (J) and the filter mechanism (I), the backwash mechanism (J) being able to move axially relative to the filter mechanism (I) through the cooperation of the backwash adjustment structure (M), and when moving toward a sewage discharge end, the water inlet channel of the filter mechanism (I) can be closed and the water inlet channel of the backwash mechanism (J) can be opened to reversely wash the filter element; when moving away from the sewage discharge end, the water inlet channel of the backwash mechanism (J) can be closed and the water inlet channel of the filter mechanism (I) can be opened, and the characteristics are: The valve head (A) is located in the water channel of the water outlet channel of the filter mechanism (I) and the backwash mechanism (J) and flows to the valve head (A). A check valve assembly cavity (B) is provided in the check valve assembly cavity (B). The check valve comprises a valve housing (1), a valve body (2) and a check adjustment structure (3). A check flow channel is provided in the valve housing (1). The valve body (2) comprises a driving part and a check part. The check part is adapted to the check flow channel. The check adjustment structure (3) is provided in the driving part. The check adjustment mechanism (3) can drive the driving part to drive the check part to close or open the check flow channel under the action of the water pressure inside the pre-filter.

2. The backwash pre-filter with built-in check valve according to claim 1, characterized in that: The controller is preset with a water use time range T and can record the duration t of the opening of the non-return flow channel.

3. The backwash pre-filter with built-in check valve according to claim 1, characterized in that: The filtering mechanism (I) comprises a filtering frame and a filtering unit, the backwashing mechanism (J) comprises a backwashing frame and a backwashing unit, the backwashing mechanism (J) is inserted in the filtering mechanism (I), the backwashing frame comprises a backwashing function section and an assembly section, and the assembly section is also fixedly provided with a backwashing opening cover (L); a raw water cavity is provided between the filtering mechanism (I) and the filter bottle, a purified water cavity is formed inside the filtering mechanism (I), the raw water cavity and the purified water cavity are connected through the filtering channel of the filtering unit, the purified water cavity is connected with the water outlet port, one end of the raw water cavity is connected with the water inlet port through the water inlet channel, and the other end is connected with the sewage discharge cavity of the sewage discharge part; the water inlet channel of the backwashing mechanism (J) is provided in the backwashing unit and is located in the adjustment cover (K), the backwashing adjustment structure (M) is an elastic reset part, and the backwashing opening cover (L) is provided with a plurality of backwashing drainage holes; There is a pressure difference △P on both sides of the backwash opening cover (L), △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 compressed, the backwash mechanism (J) moves axially in the direction of sewage flow, and the water inlet channel of the backwash mechanism (J) extends from the adjustment cover (K); when the action force corresponding to △P is less than the reaction force of the elastic reset member, the elastic reset member is reset, the backwash mechanism (J) moves axially in the direction opposite to the sewage flow, and the water inlet channel of the backwash mechanism (J) penetrates into the adjustment cover (K).

4. The pre-filter with built-in check valve according to claim 1, 2 or 3, characterized in that: It also comprises a valve seat (4), the valve housing (1) is placed inside the valve seat (4), a valve sleeve (5) is arranged between the valve seat (4) and the valve housing (1), and the non-return portion cooperates with the valve sleeve (5) to open or close the non-return flow channel.

5. The backwash pre-filter with built-in check valve according to claim 1, 2 or 3, characterized in that: The water inlet channel and the water outlet channel are both provided with a pressure sensor (E), and the pressure sensor (E) can be electrically connected to the controller.

6. The backwash pre-filter with built-in check valve according to claim 1, 2 or 3, characterized in that: The controller can be connected to a remote server or a user terminal via wireless communication. The controller is provided with a remote communication unit, and the remote communication unit includes a wireless communication module electrically connected to a circuit board of the controller.

7. The backwash pre-filter with built-in check valve according to claim 6, characterized in that: The controller has a processor function, and the wireless communication module is any one of a 2G module, a 3G module, a 4G module, a 5G module and a WiFi module, or a combination of two thereof. The remote server and the user terminal can receive information or remotely control the controller through the wireless communication module; at least one MCU is integrated on the circuit board of the controller, and the operation of the components electrically connected thereto is controlled by the MCU, and the wireless communication module is also integrated on the circuit board of the controller.

8. The backwash pre-filter with built-in check valve according to claim 1, 2 or 3, characterized in that: A sewage discharge assembly is provided at the bottom of the filter bottle (G), and the sewage discharge assembly includes an electrically controlled sewage discharge valve (H) and a driving motor, both of which are electrically connected to the controller. The controller controls the rotation of the driving motor to realize the opening and closing of the electrically controlled sewage discharge valve (H).

9. The backwash pre-filter with built-in check valve according to claim 1, 2 or 3, characterized in that: The valve housing (1) is provided with a water inlet end (11) and a check end (12); a check flow channel connects the water inlet end (11) and the check end (12); an extrusion seal can be formed or released between the check end (12) and the check portion; and a check regulating mechanism (3) controls the formation and release of the extrusion seal under the action of the water pressure inside the pre-filter, thereby closing or opening the check flow channel.

10. The backwash pre-filter with built-in check valve according to claim 9, characterized in that: The driving part is a valve stem (21), the non-return part is a valve plug (22), and the non-return adjustment structure (3) is an elastic reset element. One end of the elastic reset element is fixed to or abuts against the valve stem (21) or the valve plug (22), and the other end is fixed to or abuts against the valve head (A). The valve plug (22) can move axially under the action of the elastic reset element, thereby closing or opening the non-return flow channel.

11. The backwash pre-filter with built-in check valve according to claim 10, characterized in that: The valve head (A) is also provided with a guide groove (F), and the end of the valve stem (21) and the non-return regulating structure (3) are both arranged in the guide groove (F).

12. The backwash pre-filter with built-in check valve according to claim 4, characterized in that: The driving part is a valve stem (21), the non-return part is a valve plug (22), and the non-return adjustment structure (3) is an elastic reset element. One end of the elastic reset element is fixed to or abuts against the valve stem (21) or the valve plug (22), and the other end is fixed to or abuts against the valve seat (4). The valve seat (4) is provided with a guide hole (41) for axial movement of the valve stem (21), and the valve plug (22) can move axially under the drive of the elastic reset element.

13. The backwash pre-filter with built-in check valve according to claim 1, 2 or 3, characterized in that: The valve housing (1) is provided with at least one limiting portion A (6) at the water inlet end (11), and is provided with at least one limiting portion B (7) at the water outlet end (12). The limiting portion A (6) is used to limit and fix the valve housing (1) and the valve head. The limiting portion B (7) is used to control the axial movement distance of the valve plug (22) when closing the non-return flow channel, so as to fully form an extrusion seal.

14. The backwash pre-filter with built-in check valve according to claim 13, characterized in that: The limiting portion A (6) is a limiting boss derived from the outer circumference, the limiting portion B (7) is a limiting boss derived from the inner circumference, and the valve plug (22) has a conical structure.

15. The backwash pre-filter with built-in check valve according to claim 14, characterized in that: The limiting portion A (6), the limiting portion B (7) and the valve housing (1) are integrally formed.

16. The backwash pre-filter with built-in check valve according to claim 1, 2 or 3, characterized in that: The check valve is also provided with a displacement sensor (8), and the drive unit is also provided with a magnetic induction element (9). The magnetic induction element (9) can conduct the displacement sensor (8) through magnetic force and send a signal indicating the operation of the check valve to a controller of the pre-filter.

17. The backwash pre-filter with built-in check valve according to claim 1, 2 or 3, characterized in that: The water inlet channel, the water outlet channel and the filter bottle assembly port are provided with isolation bushings, and the isolation bushings, the valve housing (1) and the valve body (2) are made of inert materials 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.

18. The backwash pre-filter with built-in check valve according to claim 17, characterized in that: The valve housing (1) and the valve body (2) are respectively integrally injection-molded using plastic or rubber materials; the isolation bushings comprise an inlet end isolation bushing, an outlet end isolation bushing and an assembly end isolation bushing, which are integrally injection-molded using plastic or rubber materials.

19. The backwash pre-filter with built-in check valve according to claim 3, characterized in that: The filtering skeleton and the backwashing skeleton are filter skeletons, and the filtering elements and the backwashing elements are filter screens or PP cotton or filter membranes; or the filtering skeleton is a laminate skeleton, and the backwashing skeleton is a filter skeleton, and the filtering elements are filter laminates, and the backwashing elements are filter screens or PP cotton or filter membranes.

20. The backwash pre-filter with built-in check valve according to claim 1, 2 or 3, characterized in that: The filtering mechanism (I) is also provided with a water hammer prevention structure (N).

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