Backwash pre-filter with built-in check valve

Abstract

The utility model relates to a backwash prefilter with a built-in check valve, which comprises a valve head, a filter bottle, a filter mechanism and a backwash mechanism, the bottom of the filter bottle is provided with a blowdown component and 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 backwash mechanism is arranged in the check flow channel. 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 backwash control device is simple in structure, and reliable non-return, water leakage monitoring and backwash control are realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to a backflushing prefilter with built-in check valve and belongs to the technical field of water purification equipment. BACKGROUND

[0002] The mainstream product of the prior art external pressure type prefilter is in a filter bottle down type, comprising a valve head, a filter bottle connected to the upper end of the valve head, and a drain ball valve connected to the lower end of the filter bottle. A filter screen framework is arranged in the filter bottle. A filter screen is sleeved on the outer wall of the filter screen framework. In use, water flows into the gap between the filter bottle and the filter screen from the water inlet of the valve head, flows into the center of the filter screen framework after being filtered by the filter screen, and then flows to the water outlet of the valve head from the center of the filter screen framework. When sewage needs to be discharged, the drain ball valve at the lower end of the filter bottle is opened.

[0003] This prefilter structure has the following deficiencies:

[0004] 1. When the prefilter discharges sewage, the water in the water outlet pipeline may return, which may cause air to enter. Therefore, a check valve structure is needed. The check valve is a kind of valve, also known as a non-return valve or a reverse valve. Its main function is to prevent fluid from flowing backward in the pipeline. When the flow direction of the fluid in the pipeline changes, the check valve will automatically close to prevent the fluid from flowing backward, thereby protecting the safety of the pipeline and equipment. The check valve of the prior art is usually composed of a valve body, a valve cover, a valve seat, and a sealing seat. It is installed in the water inlet pipeline and the water outlet pipeline. However, the water inlet port and the water outlet port of the valve head of the prefilter have limited space. In addition, in the automatic intelligent control prefilter, the valve head integrates a controller, a driving motor, and a flow detection mechanism. The installation of the conventional check valve is limited. However, there is extra space in the water path from the center of the filter screen framework to the water outlet of the valve head, which can be used to install the check valve structure.

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

[0006] 3. In addition, when the pipeline of the pre-filter leaks, the abnormal water state needs to be fed back in time. The pre-filter of the prior art usually uses a Hall flow sensor and an ultrasonic flow sensor to monitor the pipeline leakage, but the cost is relatively high. The utility model is based on the setting of the check valve, compares the continuous opening time of the check valve with the preset time of the controller, judges the water state, and reminds the user in time, so that the dynamic water leakage monitoring is realized at low cost. Utility model content

[0007] The utility model aims at providing a pre-filter with more optimized structure, which comprises a valve head structure with a built-in check valve. The check valve is arranged in the water path from the center of the filter screen framework to the water outlet of the valve head. When the pre-filter is discharging sewage, reliable control of the check valve is realized to avoid air entering due to water returning to the water outlet pipeline, and the installation of other intelligent control components of the valve head is not affected. By reasonably arranging a pressure sensor, the cleaning time of the filter screen is accurately evaluated according to the value change of the pressure sensor of the pre-filter. In addition, a water leakage monitoring mechanism is arranged. The opening duration t of the check valve is compared with the preset household water time range T. When the opening duration t of the check valve is abnormal, there is a high probability of leakage. The user is fed back or reminded in time. In addition, a backwashing mechanism is arranged. The filter unit can be automatically and efficiently backwashed when needed, the use effect of the pre-filter is improved, and the service life of the pre-filter is greatly prolonged.

[0008] The utility model adopts the technical scheme to solve the technical problems:

[0009] The backwashing 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 assembled with a filter bottle. The filter bottle is coaxially provided with a filter mechanism and a backwashing mechanism. A sewage discharge assembly is arranged at the bottom of the filter bottle. A controller is further arranged. A backwashing adjusting structure is arranged between the backwashing mechanism and the filter mechanism. The backwashing mechanism can axially move relative to the filter mechanism through the cooperation of the backwashing adjusting structure. When moving towards the sewage discharge end, the water inlet channel of the filter mechanism can be closed and the water inlet channel of the backwashing mechanism can be opened, so as to backwash the filter unit. When moving away from the sewage discharge end, the water inlet channel of the backwashing mechanism can be closed and the water inlet channel of the filter mechanism can be opened. The valve head is arranged in the water channel of the outlet channel of the filter mechanism and the backwashing mechanism. A check valve assembly cavity is arranged in the water channel. A check valve is arranged in the check valve assembly cavity. The check valve comprises a valve body and a check adjusting structure. A check flow channel is arranged in the check valve assembly cavity. The valve body comprises a driving part and a check part. The check part is matched with the check flow channel. The check adjusting structure is arranged in the driving part. The check adjusting structure 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 in the pre-filter.

[0010] The utility model discloses a built-in check valve, simple structure, easy to install, set up in the water channel of the water outlet channel of the filter mechanism and the backwashing mechanism center flow valve head, when the built-in filter blows down, realize reliable check tube control, avoid the water of the water outlet pipeline and cause air to enter, and the structure influence of prior art valve head is little, does not affect the installation of other intelligent control components of valve head, and can realize the reverse flushing function.

[0011] Preferably, the controller is preset with a water use time range T, and can record the duration t of the opening of the check flow channel.

[0012] By comparing the opening duration t of the check valve with the preset domestic water use time range T, when the opening duration t of the check valve is abnormal, there is a high probability of leakage, and the user can be fed back or reminded in time, and dynamic water leakage monitoring is realized at low cost.

[0013] Preferably, the filter mechanism includes a filter skeleton and a filter unit, and the backwashing mechanism includes a backwashing skeleton and a backwashing unit, the backwashing mechanism is inserted into the filter mechanism, the backwashing skeleton includes a backwashing function section and an assembly section, and the assembly section is further provided with a backwashing opening cover; a raw water cavity is arranged between the filter mechanism and the filter bottle, a purified water cavity is formed inside the filter mechanism, the raw water cavity and the purified water cavity are communicated through a filter hole of the filter unit, the purified water cavity is communicated with a water outlet port, one end of the raw water cavity is communicated with a water inlet port through a water inlet channel, and the other end is communicated with a blowdown cavity of a blowdown piece; the water inlet channel of the backwashing mechanism is arranged in the backwashing unit and located in an adjusting cover, the backwashing adjusting structure is an elastic return piece, and the backwashing opening cover is provided with a plurality of backwashing drain holes.

[0014] There is a pressure difference ΔP between the two sides of the backwashing opening cover, ΔP ≥ 0, when the corresponding force of ΔP is greater than the counterforce of the elastic return piece, the elastic return piece is compressed, the backwashing mechanism moves axially along the direction of the blowdown water flow, and the water inlet channel of the backwashing mechanism extends out of the adjusting cover; when the corresponding force of ΔP is less than the counterforce of the elastic return piece, the elastic return piece resets, the backwashing mechanism moves axially against the direction of the blowdown water flow, and the water inlet channel of the backwashing mechanism is deep into the adjusting cover.

[0015] The axial movement of the backwashing mechanism relative to the filter mechanism is driven by the pressure difference between the two sides of the backwashing opening cover, which is convenient to operate and saves energy consumption.

[0016] Preferably, the valve shell is arranged in the valve seat, a valve sleeve is arranged between the valve seat and the valve shell, and the check part is opened or closed through the cooperation of the valve sleeve.

[0017] Preferably, the water inlet channel and the water outlet channel are both provided with a pressure sensor, and the pressure sensor can be electrically connected with the controller of the pre-filter.

[0018] Working principle: when the product is in normal use, the filter unit will be gradually blocked, the blockage 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 blowdown assembly to open, and automatic flushing and blowdown are realized, after the flushing and blowdown are completed, the controller controls the blowdown assembly to close again.

[0019] Preferably, the controller can be connected with a remote server or a user terminal through a wireless communication mode, the controller is provided with a remote communication unit, and the remote communication unit comprises a wireless communication module electrically connected with the circuit board of the controller.

[0020] Preferably, the controller has a processor function, the wireless communication module is any one or a combination of two of a 2G module, a 3G module, a 4G module, a 5G module and a WiFi module, 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 working of the electrically connected components is controlled by the MCU, and the wireless communication module is also integrated on the circuit board of the controller.

[0021] Preferably, the blowdown assembly comprises an electrically controlled blowdown valve and a driving motor, both of which are electrically connected with the controller, and the rotation of the driving motor is controlled by the controller to realize the opening and closing of the electrically controlled blowdown valve.

[0022] Preferably, the valve housing is provided with a water inlet end and a reverse flow prevention end, a reverse flow prevention channel is in communication with the water inlet end and the reverse flow prevention end, the reverse flow prevention end and the reverse flow prevention part can form or release extrusion sealing, and the reverse flow prevention adjusting structure controls the formation and release of the extrusion sealing under the action of the internal water pressure of the pre-filter, so as to close or open the reverse flow prevention channel.

[0023] Preferably, the driving part is a valve rod, the reverse flow prevention part is a valve plug, and the reverse flow prevention adjusting structure is an elastic return element, one end of the elastic return element is fixed or abuts against the valve rod, and the other end can be fixed or abutted against the valve head of the pre-filter, the valve plug can move axially under the driving of the elastic return element, so as to close or open the reverse flow prevention channel.

[0024] Preferably, the valve head is also provided with a guide groove, and the end of the valve rod and the reverse flow prevention adjusting structure are arranged in the guide groove.

[0025] Preferably, the driving part is a valve rod, the reverse flow prevention part is a valve plug, and the reverse flow prevention adjusting structure is an elastic return element, one end of the elastic return element is fixed or abuts against the valve rod or the valve plug, and the other end is fixed or abutted against the valve seat, the valve seat is provided with a guide hole for the axial movement of the valve rod, and the valve plug can move axially under the driving of the elastic return element.

[0026] Preferably, the valve shell is provided with at least one limiting part A at the water inlet end and at least one limiting part B at the check end, the limiting part A is used to limit and fix the valve shell and the filter valve head, and the limiting part B is used to control the axial movement distance of the valve plug when the valve plug closes the check flow channel to form a sufficient extrusion seal.

[0027] Preferably, the limiting part A is a limiting boss derived from the outer side, and the limiting part B is a limiting boss derived from the inner side, and the valve plug is in a conical structure.

[0028] Preferably, the limiting part A and the limiting part B are integrally formed with the valve shell.

[0029] Preferably, the built-in check valve structure is further provided with a displacement sensor, and the driving part 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.

[0030] Preferably, the water inlet channel, the water outlet channel and the filter bottle assembly port are provided with isolation bushings, the isolation bushings, the valve shell and the valve body 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.

[0031] Preferably, the valve shell and the valve body are integrally injection molded by plastic or rubber material respectively; the isolation bushings include water inlet end isolation bushings, water outlet end isolation bushings and assembly end isolation bushings, which are integrally injection molded by plastic or rubber material.

[0032] Preferably, the filter framework and the backwashing framework are filter screen frameworks, and the filter unit and the backwashing unit are filter screens or PP cotton or filter membranes; or the filter framework is a laminated framework, the backwashing framework is a filter screen framework, the filter unit is a filter laminated sheet, and the backwashing unit is a filter screen or PP cotton or filter membrane.

[0033] Preferably, the filter mechanism is further provided with a water hammer prevention structure.

[0034] The utility model discloses a beneficial effect is: provide a structure more optimal prefilter, including the valve head structure of built -in check valve, and check valve sets up in the water way of filter screen skeleton center flow to the water outlet of valve head, when prefilter blowdown, realize reliable check control, avoid the water of outlet pipeline and lead to air entering, and do not influence the installation of other intelligent control components of valve head, through the reasonable setting pressure sensor, through the numerical change of prefilter pressure sensor, accurate evaluation filter screen's cleaning opportunity, in addition, set up the water leakage monitoring mechanism, through the opening duration t of check valve and the comparison of the household commonly used water time range T of prearranging, when the opening duration t of check valve is unusual, the probability is the leakage state, will timely feedback or remind the user, in addition, set up the backflushing mechanism, can when needing automatic efficient backflushing filter unit, improve the use effect of prefilter, greatly prolong its life. BRIEF DESCRIPTION OF DRAWINGS

[0035] 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 to use in the embodiment or prior art description simple introduction, obviously, below description's drawing only some embodiments of the utility model, for the ordinary skill in the art person, under the premise of not paying creative labor, can also obtain other drawings according to these drawings.

[0036] Figure 1 It is the exploded view of check valve of the utility model;

[0037] Figure 2 It is Figure 1 partial exploded view;

[0038] Figure 3 It is Figure 1 combination body schematic view;

[0039] Figure 4 It is the structure schematic view of valve head of the utility model;

[0040] Figure 5 It is Figure 4 partial sectional view;

[0041] Figure 6 It is the use state sectional view (open valve state) of valve head of the utility model;

[0042] Figure 7 It is the use state sectional view (close valve state) of valve head of the utility model;

[0043] Figure 8 It is the structure schematic view of the utility model;

[0044] Figure 9 It is Figure 8 sectional view;

[0045] Figure 10 is the sectional view (filtering state) of the utility model;

[0046] Figure 11 is the sectional view (pollution discharge state) of the utility model.

[0047] In the figure: 1, valve shell, 11, water inlet end, 12, check end, 2, valve body, 21, valve rod, 22, valve plug, 3, check adjusting 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 cavity, E, pressure sensor, F, guide groove, G, filter bottle, H, electric control pollution discharge valve, I, filtering mechanism, J, backwashing mechanism, K, adjusting cover, L, backwashing opening cover, M, backwashing adjusting structure, N, waterproof hammer structure. DETAILED DESCRIPTION

[0048] The embodiments of the utility model are described in detail below, the examples of the embodiments are shown in the drawings, wherein the same or similar signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as the limitation of the utility model.

[0049] In the description of the utility model, it is understood that the orientation description, such as up, down, front, back, left, right and the like, is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and is not indicative or implied that the indicated device or element must have a specific orientation, a specific orientation and operation, therefore, it cannot be understood as the limitation of the utility model.

[0050] In the description of the utility model, if the first, second is described for the purpose of distinguishing technical features, it cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0051] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installing, connecting and the like should be understood broadly, and the person skilled in the art can determine the specific meaning of the above words in the utility model according to the specific content of the technical scheme.

[0052] As Figures 1-11The backwashing pre-filter with built-in check valve is shown, including valve head A with water inlet port, water outlet port and filter bottle assembly port, the filter bottle assembly port is assembled with filter bottle G, the filter bottle G is coaxially provided with filter mechanism I and backwashing mechanism J, the bottom of the filter bottle G is provided with a sewage assembly, and a controller is further provided: the valve head A is located in the water channel of the water outlet channel of the filter mechanism I and the backwashing mechanism J, and a check valve assembly cavity B is arranged in the water channel, a check valve is arranged in the check valve assembly cavity B, the check valve includes valve shell 1, valve body 2 and check valve adjusting structure 3, the valve shell 1 is provided with a check flow channel, the valve body 2 includes a driving part and a check part, the check part is matched with the check flow channel, the check valve adjusting structure 3 is arranged on the driving part, and the check valve adjusting structure 3 can drive the driving part to drive the check part to close or open the check flow channel under the action of the internal water pressure of the pre-filter;

[0053] The backwashing mechanism I and the filter mechanism J are provided with backwashing adjusting structure M, and the backwashing mechanism J can move axially relative to the filter mechanism I through the cooperation of the backwashing adjusting structure M, when moving to the sewage end, the water inlet channel of the filter mechanism I can be closed and the water inlet channel of the backwashing mechanism J can be opened, and the filter unit can be backwashed; when moving away from the sewage end, the water inlet channel of the backwashing mechanism J can be closed and the water inlet channel of the filter mechanism I can be opened;

[0054] The controller is provided with a water use time range T, and can record the duration t of the opening of the check flow channel. By comparing the opening duration t of the check valve with the preset household water use time range T, when the opening duration t of the check valve is abnormal, it is likely to be a leakage state, and the user can be fed back or reminded in time, and dynamic water leakage monitoring can be realized at low cost.

[0055] Specifically, the filter mechanism I includes a filter skeleton and a filter unit, the backwashing mechanism J includes a backwashing skeleton and a backwashing unit, the backwashing mechanism J is inserted into the filter mechanism I, the backwashing skeleton includes a backwashing functional section and an assembly section, and the assembly section is further fixedly provided with a backwashing opening cover L; a raw water cavity is arranged between the filter mechanism I and the filter bottle G, a purified water cavity is formed in the filter mechanism I, the raw water cavity and the purified water cavity are communicated through the filter hole of the filter unit, the purified water cavity is communicated with the water outlet, one end of the raw water cavity is communicated with the water inlet port through the water inlet channel, and the other end is communicated with the sewage cavity of the sewage piece; the water inlet channel of the backwashing mechanism J is arranged in the backwashing unit and located in the adjusting cover K, the backwashing adjusting structure M is an elastic reset piece, arranged between the backwashing mechanism J and the filter mechanism I, and specifically located between the assembly section and the backwashing opening cover L, the backwashing opening cover L is provided with a plurality of backwashing drain holes;

[0056] When the pressure difference ΔP between the two sides of the backwash opening cover L is greater than or equal to 0, and the corresponding force is greater than the counterforce of the elastic reset member, the elastic reset member is compressed, the backwash mechanism J moves axially along the direction of the sewage flow, and the water inlet channel of the backwash mechanism J extends out of the adjusting cover K; when the corresponding force is less than the counterforce of the elastic reset member, the elastic reset member resets, the backwash mechanism J moves axially against the direction of the sewage flow, and the water inlet channel of the backwash mechanism J extends into the adjusting cover K.

[0057] In the embodiment, the valve seat 4 is further included, the valve shell 1 is arranged in the valve seat 4, the valve sleeve 5 is arranged between the valve seat 4 and the valve shell 1, the reverse flow prevention part is opened or closed through cooperation of the valve sleeve 5, the water inlet channel and the water outlet channel are each provided with a pressure sensor E, the pressure sensor E is electrically connected with the controller, the controller is connected with the remote server or the 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 with the circuit board of the controller, the controller has a processor function, the wireless communication module is any one or a combination of two of a 2G module, a 3G module, a 4G module, a 5G module and a WiFi module, 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 work of components electrically connected with the MCU is controlled by the MCU, the wireless communication module is also integrated on the circuit board of the controller, the sewage discharge assembly includes an electrically controlled sewage valve H and a driving motor, and is electrically connected with the controller, and the controller controls the operation of the driving motor to open and close the electrically controlled sewage valve H.

[0058] Specifically, in the embodiment, the valve shell 1 is provided with a water inlet end 11 and a reverse flow prevention end 12, the reverse flow prevention channel communicates the water inlet end 11 and the reverse flow prevention end 12, the reverse flow prevention end 12 and the reverse flow prevention part can form or release extrusion sealing, and the reverse flow prevention adjusting structure 3 controls formation and release of the extrusion sealing under the action of the internal water pressure of the pre-filter, so as to close or open the reverse flow prevention channel.

[0059] In the embodiment, the driving part is a valve rod 21, the reverse flow prevention part is a valve plug 22, the reverse flow prevention adjusting structure 3 is an elastic reset element, one end of the elastic reset element is fixed or abuts against the valve rod 21 or the valve plug 22, and the other end of the elastic reset element can be fixed or abut against the valve head A of the pre-filter, the valve plug 22 can move axially under the drive of the elastic reset element, so as to close or open the reverse flow prevention channel, and the valve head A is further provided with a guide groove F, and the driving part and the reverse flow prevention adjusting structure 3 of the valve body 2 are arranged in the guide groove F.

[0060] As a parallel implementation scheme, the driving part is the valve rod 21, the check part is the valve plug 22, the check adjustment structure 3 is an elastic return element, one end of the elastic return element is fixed or abuts against the valve rod 21 or the valve plug 22, the other end is fixed or abuts against the valve seat 4, the valve seat 4 is provided with a guide hole 41 for the axial movement of the valve rod 21, and the valve plug 22 can be axially moved under the driving of the elastic return element.

[0061] The two parallel schemes can also be combined to maximize the adjustment effect.

[0062] In this embodiment, the valve housing 1 is provided with at least one limiting part A6 at the water inlet end 11 and at least one limiting part B7 at the check end 12, the limiting part A6 is used to limit and fix the valve housing 1 and the pre-filter valve head, and the limiting part B7 is used to control the axial movement distance of the valve plug 22 when closing the check flow channel, so as to fully form the extrusion seal.

[0063] In this embodiment, the limiting part A6 is a limiting boss derived from the outer side, the limiting part B7 is a limiting boss derived from the inner side, and the valve plug 22 is in a conical structure.

[0064] In this embodiment, the limiting part A6 and the limiting part B7 are integrally formed with the valve housing 1.

[0065] In this embodiment, the built-in check valve structure is also provided with a displacement sensor 8, and the driving part is also provided with a magnetic induction element 9, which can conduct the displacement sensor 8 through magnetic force and send a signal of the check valve operation to the controller of the pre-filter.

[0066] In this embodiment, the water inlet channel, the water outlet channel and the filter bottle assembly port are provided with isolation bushings, the isolation bushings, the valve housing 1 and the valve body 2 are processed from inert materials or at least one side in contact with water is coated with an inert material coating, and the inert material is plastic, rubber or ceramic.

[0067] In this embodiment, the valve housing 1 and the valve body 2 are integrally injection molded from plastic or rubber material respectively; the isolation bushings include water inlet end isolation bushings, water outlet end isolation bushings and assembly end isolation bushings, which are integrally injection molded from plastic or rubber material.

[0068] In this embodiment, the filter skeleton and the backwashing skeleton are filter screen skeletons, and the filter unit and the backwashing unit are filter screens or PP cotton or filter membranes; or the filter skeleton is a laminated skeleton, the backwashing skeleton is a filter screen skeleton, the filter unit is a filter laminated sheet, and the backwashing unit is a filter screen or PP cotton or filter membrane, and the filter mechanism I is also provided with a waterproof hammer structure N.

[0069] The above-described embodiment is only a preferred scheme of the present application, and does not limit the present application in any form, and other variants and modifications are possible without departing from the technical scheme recited in the claims.

Claims

1. A back-flushing pre-filter with built-in check valve, comprising a valve head (A) with an inlet port, an outlet port and a filter bottle assembly port, the filter bottle assembly port is assembled with a filter bottle (G), the filter bottle (G) is coaxially provided with a filtering mechanism (I) and a back-flushing mechanism (J), and is further provided with a controller, a back-flushing adjusting structure (M) is arranged between the back-flushing mechanism (J) and the filtering mechanism (I), through cooperation of the back-flushing adjusting structure (M), the back-flushing mechanism (J) can move axially relative to the filtering mechanism (I), when moving towards a blowdown end, the water inlet channel of the filtering mechanism (I) can be closed and the water inlet channel of the back-flushing mechanism (J) can be opened, so as to back-flush the filter element; when moving away from the blowdown end, the water inlet channel of the back-flushing mechanism (J) can be closed and the water inlet channel of the filtering mechanism (I) can be opened, characterized in that: The valve head (A) is located in the water channel of the filter mechanism (I) and the backwashing mechanism (J) and the outlet water channel of the valve head (A) is provided with a check valve assembly cavity (B), and the check valve assembly cavity (B) is provided with a check valve, the check valve comprises a valve shell (1), a valve body (2) and a check valve adjusting structure (3), the valve shell (1) is provided with a check flow channel, the valve body (2) comprises a driving part and a check part, the check part is matched with the check flow channel, and the check valve adjusting structure (3) is arranged on the driving part. The check valve adjusting structure (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 in the front filter.

2. The backflushing prefilter with built-in check valve according to claim 1, characterized in that: The controller is provided with a water use time range T, and can record the duration t of the opening of the check flow channel.

3. The backwashing pre-filter with built-in check valve according to claim 1, characterized in that: The filter mechanism (I) comprises a filter framework and a filter unit, and the backwashing mechanism (J) comprises a backwashing framework and a backwashing unit, the backwashing mechanism (J) is inserted into the filter mechanism (I), the backwashing framework comprises a backwashing functional section and an assembly section, and the assembly section is further provided with a backwashing opening cover (L); the filter mechanism (I) is provided with a raw water cavity between the filter mechanism (I) and the filter bottle, and a purified water cavity is formed in the filter mechanism (I). The raw water cavity and the purified water cavity are communicated through the filter hole of the filter unit, the purified water cavity is communicated with the water outlet port, one end of the raw water cavity is communicated with the water inlet port through the water inlet channel, and the other end is communicated with the sewage discharge cavity of the sewage discharge part; the water inlet channel of the backwashing mechanism (J) is arranged in the backwashing unit and located in the adjusting cover (K), the backwashing adjusting structure (M) is an elastic reset part, and the backwashing opening cover (L) is provided with a plurality of backwashing drainage holes. When the pressure difference ΔP on both sides of the backwashing opening cover (L) is greater than or equal to 0, and the corresponding force is greater than the reaction force of the elastic reset part, the elastic reset part is compressed, the backwashing mechanism (J) moves axially along the sewage flow direction, and the water inlet channel of the backwashing mechanism (J) extends out of the adjusting cover (K); when the corresponding force is less than the reaction force of the elastic reset part, the elastic reset part resets, the backwashing mechanism (J) moves axially against the sewage flow direction, and the water inlet channel of the backwashing mechanism (J) extends into the adjusting cover (K).

4. The backwashing pre-filter with built-in non-return valve according to claim 1 or 2 or 3, characterized in that: Further comprising a valve seat (4), the valve shell (1) is arranged in the valve seat (4), and a valve sleeve (5) is arranged between the valve seat (4) and the valve shell (1). The check part opens or closes the check flow channel through the cooperation of the valve sleeve (5).

5. The backwashing pre-filter with built-in non-return valve according to claim 1 or 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 with the controller.

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

7. The backflushing prefilter with built-in check valve according to claim 6, characterized in that: The controller has a processor function, the wireless communication module is any one or a combination of two of 2G module, 3G module, 4G module, 5G module and WiFi module, and 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 working 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 backwashing pre-filter with built-in non-return valve according to claim 1 or 2 or 3, characterized in that: The bottom of the filter bottle (G) is provided with a pollution discharge assembly, the pollution discharge assembly comprises an electrically controlled pollution discharge valve (H) and a driving motor, and is electrically connected with the controller, and the rotation of the driving motor is controlled by the controller to realize the opening and closing of the electrically controlled pollution discharge valve (H).

9. The backwashing pre-filter with built-in non-return valve according to claim 1 or 2 or 3, characterized in that: The valve housing (1) is provided with a water inlet end (11) and a reverse flow prevention end (12), a reverse flow prevention channel is communicated between the water inlet end (11) and the reverse flow prevention end (12), the reverse flow prevention end (12) and the reverse flow prevention part can form or release extrusion sealing, and the reverse flow prevention adjusting structure (3) controls the formation and release of the extrusion sealing under the action of the water pressure in the pre-filter, and then closes or opens the reverse flow prevention channel.

10. The backflushing prefilter with a built-in check valve according to claim 9, characterized in that: The driving part is a valve rod (21), the reverse flow prevention part is a valve plug (22), the reverse flow prevention adjusting structure (3) is an elastic return element, one end of the elastic return element is fixed or abuts against the valve rod (21) or the valve plug (22), the other end is fixed or abuts against the valve head (A), and the valve plug (22) can move axially under the action of the elastic return element, and then the reverse flow prevention channel is closed or opened.

11. The backflushing prefilter with a 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 rod (21) and the reverse flow prevention adjusting structure (3) are arranged in the guide groove (F).

12. The backflushing prefilter with a built-in check valve according to claim 4, characterized in that: The driving part is a valve rod (21), the reverse flow prevention part is a valve plug (22), the reverse flow prevention adjusting structure (3) is an elastic return element, one end of the elastic return element is fixed or abuts against the valve rod (21) or the valve plug (22), the other end is fixed or abuts against the valve seat (4), the valve seat (4) is provided with a guide hole (41) for the axial movement of the valve rod (21), and the valve plug (22) can move axially under the drive of the elastic return element.

13. The backflushing prefilter with built-in check valve according to claim 1 or 2 or 3, characterized in that: The valve housing (1) is provided with at least one limiting part A (6) at the water inlet end (11) and at least one limiting part B (7) at the reverse flow prevention end (12), the limiting part A (6) is used for limiting and fixing the valve housing (1) and the valve head, and the limiting part B (7) is used for controlling the axial movement distance of the valve plug (22) when the valve plug (22) closes the reverse flow prevention channel, so that the extrusion sealing is fully formed.

14. The backflushing prefilter with a built-in check valve according to claim 13, characterized in that: The limiting part A (6) is a limiting boss derived from the outer side in a circumferential direction, the limiting part B (7) is a limiting boss derived from the inner side in a circumferential direction, and the valve plug (22) has a conical structure.

15. The backflushing prefilter with a built-in check valve according to claim 14, characterized in that: The limiting part A (6) and the limiting part B (7) are integrally formed with the valve housing (1).

16. The backwashing pre-filter with built-in non-return valve according to claim 1 or 2 or 3, characterized in that: The reverse flow prevention valve is also provided with a displacement sensor (8), and the driving part 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 of the operation of the reverse flow prevention valve to the controller of the pre-filter.

17. The backflushing prefilter with built-in non-return valve according to claim 1 or 2 or 3, characterized in that: The water inlet channel, water outlet channel and filter bottle assembly port are provided with isolation bushings, the isolation bushings, valve shell (1) and 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 backflushing prefilter with a built-in check valve according to claim 17, characterized in that: The valve shell (1) and valve body (2) are integrally injection molded by plastic or rubber material respectively; the isolation bushings include water inlet end isolation bushing, water outlet end isolation bushing and assembly end isolation bushing, and are integrally injection molded by plastic or rubber material.

19. The backwashing pre-filter with built-in non-return valve according to claim 3, characterized in that: The filter framework and backwashing framework are filter screen frameworks, and the filter unit and backwashing unit are filter screens or PP cotton or filter membranes; or the filter framework is a laminated framework, the backwashing framework is a filter screen framework, the filter unit is a filter laminated sheet, and the backwashing unit is a filter screen or PP cotton or filter membrane.

20. The backwashing pre-filter with built-in non-return valve according to claim 1 or 2 or 3, characterized in that: The filter mechanism (I) is further provided with a waterproof hammer structure (N).

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