A large-flux backwash pre-filter

Abstract

The application discloses a large-flux backwashing pre-filter, and relates to the technical field of filters.The large-flux backwashing pre-filter comprises a valve body assembly, a shunt assembly and a filter core assembly.The valve body assembly comprises a valve head and at least two valve bottles, the side wall of the valve head is provided with a liquid inlet and a liquid outlet which are communicated with the inner cavity of the valve head, each valve bottle is sealingly arranged on the peripheral surface of the valve head, and the intersection part of the valve head and the valve bottle is provided with a first through hole and a second through hole, the first through hole is close to the liquid inlet, and the second through hole is close to the liquid outlet;the filter core assembly comprises at least two filter cores, each filter core is sealingly inserted into the corresponding valve bottle through the second through hole;the shunt assembly is arranged in the inner cavity of the valve head and is used for dividing the inner cavity of the valve head into two parts, and the cavity on the side of the liquid inlet of the valve head is communicated with the inner cavity of the valve bottle through the first through hole, and the cavity on the side of the liquid outlet of the valve head is communicated with the inner cavity of the filter core through the second through hole.The pre-filter has a large flux under the premise of allowing additional rich functions.

Description

Technical Field

[0001] This invention relates to the field of filter technology, and more specifically, to a high-flow-rate backwashing pre-filter. Background Technology

[0002] The city's water supply pipelines are old and long. Rust, silt and other impurities in the pipelines can cause water-using equipment to malfunction. Therefore, it is necessary to install filtration devices on water-using equipment. Pre-filters are usually installed after the water meter. Their main function is to restore the tap water to the standard before it leaves the factory and protect downstream equipment.

[0003] To filter water with a high flow rate in pipelines, existing pre-filters typically increase the inlet diameter, simplify the filter element, and enlarge the filter screen to increase the filtration area. However, existing pre-filters have limited space, and the required functions of the pre-filter have to be simplified after increasing the inlet diameter.

[0004] In conclusion, how to increase the throughput of filters while allowing for the addition of richer functionalities is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a high-flow-rate backwashing pre-filter that has a large flow rate while allowing for a wide range of additional functions.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A high-flow-rate backwash pre-filter, comprising:

[0008] A valve body assembly includes a valve head and at least two valve bottles. The side wall of the valve head has an inlet and an outlet that communicate with the inner cavity of the valve head. Each valve bottle is sealed on the circumferential surface of the valve head. A first through hole and a second through hole are provided at the intersection of the valve head and the valve bottle. The first through hole is closer to the inlet, and the second through hole is closer to the outlet.

[0009] The filter element assembly includes at least two filter elements, each filter element being sealed and inserted into the interior of the corresponding valve bottle through the second through hole;

[0010] A flow divider assembly is disposed inside the valve head to divide the inner cavity of the valve head into two parts. The chamber on the side of the valve head with the liquid inlet is connected to the inner cavity of the valve bottle through the first through hole, and the chamber on the side of the valve head with the liquid outlet is connected to the inner cavity of the filter element through the second through hole.

[0011] Preferably, the diversion assembly includes a valve ball and a handle;

[0012] The valve ball is rotatably embedded inside the valve head, and the circumferential surface of the valve ball has several openings, and the interior of the valve ball has a channel connecting each of the openings;

[0013] The handle is rotatably mounted on the valve body assembly, and the handle is fixedly connected to the valve ball, so as to switch the high-flow backwash pre-filter to a filtering state, a backwashing state, or a closed state.

[0014] The filtration state is such that the liquid flowing in from the inlet can flow through the valve ball and the first through hole to the inner cavity of each valve bottle, and sequentially through the inner cavity of the filter element, the second through hole and the outlet;

[0015] The backwashing state is that the liquid flowing in from the inlet can flow through the valve ball to the chamber connected to the outlet, and sequentially through the second through hole, the inner cavity of the filter element, the inner cavity of the valve bottle, and the opening of the side wall of the valve bottle;

[0016] The closed state means that the liquid flowing into the inlet cannot pass through the valve ball.

[0017] Preferably, the valve head includes an outer structure and a plug-in structure disposed inside the outer structure, wherein the outer structure is threadedly connected to the valve bottle;

[0018] The plug-in structure includes a main body, a first plug-in part, and a second plug-in part;

[0019] The first plug-in portion is located in the middle of the main body, and each first plug-in portion is sealed and plugged into the corresponding valve bottle, and the first through hole is located at the connection between the first plug-in portion and the main body;

[0020] The second insertion part is collinear with the first insertion part, and the second insertion part is located inside the first insertion part. The second through hole is located at the free end of the second insertion part, and the second insertion part is sealed and inserted into the corresponding filter element.

[0021] Preferably, the plug-in structure is sealed and fitted inside the outer structure;

[0022] The valve bottle is sealed to the outer structure by a threaded connection, and the chamber between the plug-in structure and the outer structure is connected to the inner cavity of each of the first plug-in parts;

[0023] The valve ball has a three-way structure, with only one of the first insertion parts having the first through hole, and the remaining first insertion parts being closed to the valve bottle.

[0024] Preferably, a drain assembly is inserted at the tail end of the inner cavity of the bottom valve bottle. The drain assembly includes a funnel, a first seal, and a first switch. The top of the funnel is sealed and inserted into the bottom valve bottle, and the bottom opening of the funnel communicates with the through hole in the middle of the first seal. The tail end of the bottom valve bottle has a third through hole, and the bottom end of the first seal is sealed and inserted into the third through hole. The first switch is provided in the middle through hole of the first seal for opening or closing the middle through hole of the first seal.

[0025] And / or, a drainage assembly is inserted at the tail end of the inner cavity of the top valve bottle. The drainage assembly includes a drainage seat, a second seal, and a second switch. The top end of the top filter element is sealed and inserted into the bottom end of the drainage seat. The top end of the drainage seat is sealed and inserted into the through hole in the middle of the second seal. The inner cavity of the top filter element is connected to the through hole in the middle of the second seal through the drainage seat. The tail end of the top valve bottle has a fourth through hole. The top end of the second seal is sealed and inserted into the fourth through hole. A second switch for opening or closing the second seal is provided in the through hole in the middle of the second seal.

[0026] Preferably, the valve ball is disposed inside the valve head via a rubber component, and the valve ball is rotatably fitted into the inner cavity of the rubber component to reduce wear between the valve ball and the valve head and to seal the gap between the valve ball and the valve head;

[0027] And / or, the inner cavity of the valve head has a raised structure, and the first end of the rubber part abuts against the raised structure; a clamping member is threadedly connected to the inner cavity of the valve head having an inlet end, and the clamping member abuts against the second end of the rubber part.

[0028] Preferably, the diversion assembly further includes an adapter, the first end of which is sealed and inserted into the filter element, and the second end of which is sealed and inserted into the free end of the second insertion part, so that the filter element is located at the center of the valve bottle.

[0029] Preferably, the filter element is fitted with a water distribution component on its circumference. The water distribution component is sealed and inserted into the valve bottle, and the water distribution component is located at the end of the valve bottle near the valve head. The end of the water distribution component away from the valve head has an inclined blade to guide the liquid to flow in a swirling direction.

[0030] Preferably, the filter element includes a frame and a filter screen, the frame being a cylindrical structure, and the filter screen being sleeved on the outside of the frame.

[0031] Preferably, the inlet is sealed with a first swivel joint, and the outlet is sealed with a second swivel joint;

[0032] And / or, the first union is collinear with the end of the valve head having the inlet and is threadedly connected via a connector, and the second union is collinear with the end of the valve head having the outlet and is threadedly connected via the connector.

[0033] The valve body assembly provided by this invention is the main structure of the pre-filter, used to install and support the diversion assembly and the filter assembly, etc. A through hole is opened on the side wall of one end of the valve head as a liquid inlet, and a through hole is opened on the side wall of the other end of the valve head as a liquid outlet. Several hollow valve bottles intersecting with itself are arranged around the side wall of the middle part of the valve head, and two independent through holes are opened on the side wall of the housing where the valve bottle and the valve head intersect, respectively serving as the first through hole and the second through hole. The first through hole is located on the side closer to the liquid inlet, and the second through hole is located on the side closer to the liquid outlet.

[0034] The diversion assembly is used to divide the inner cavity of the valve head into two independent chambers; each filter element in the filter element assembly is used to filter the liquid flowing into the pre-filter, wherein the number of filter elements is the same as the number of valve bottles, the filter elements are inserted into the valve bottles through the second through hole, and the circumferential surface of the filter element is sealed with the hole wall of the second through hole, thereby preventing the liquid in the inner cavity of the filter element and the chamber on the side of the valve head near the liquid outlet from seeping out from the gap between the filter element and the second through hole.

[0035] When in use, the liquid flows into the valve head from the inlet, then flows into the inner cavity of the valve bottle through the first through hole, and then the liquid passes through the side wall of the filter element and enters the interior of the filter element, and finally flows out through the second through hole and the outlet in sequence.

[0036] The pre-filter has several valve bottles on the circumference of the valve head. Liquid flowing into the valve head from the inlet can be diverted into each valve bottle and filtered by each filter element. Thus, the pre-filter meets the filtration requirements of large flow rates of liquid. Furthermore, the filter element is relatively small, leaving sufficient space between the filter element and the valve bottle to accommodate functional components inside and outside each valve bottle, thereby enabling the addition of various functions. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the structure of a specific embodiment provided by the present invention;

[0039] Figure 2 A cross-sectional view of a specific embodiment provided by the present invention;

[0040] Figure 3 This is a schematic diagram of the filtering state in a specific embodiment of the present invention;

[0041] Figure 4 This is a schematic diagram of the backwashing state in a specific embodiment provided by the present invention;

[0042] Figure 5 This is a cross-sectional view of the insertion structure in the valve head according to a specific embodiment of the present invention;

[0043] Figure 6 A schematic diagram of the insertion structure in the valve head according to a specific embodiment of the present invention;

[0044] Figure 7 for Figure 2 A magnified view of a portion of point A in the middle;

[0045] Figure 8 for Figure 2 A magnified view of a portion of point B in the middle;

[0046] Figure 9 This is a schematic diagram of the water distribution component according to a specific embodiment of the present invention;

[0047] Figure 10 This is a schematic diagram of the structure of the rubber part according to a specific embodiment of the present invention;

[0048] Figure 11 This is a schematic diagram of the structure of the clamping component in a specific embodiment of the present invention;

[0049] Figure 12 This is a schematic diagram of the skeleton structure of a specific embodiment provided by the present invention;

[0050] Figure 13 This is a schematic diagram of the structure of the filter cover according to a specific embodiment of the present invention;

[0051] Figure 14 This is a schematic diagram of the structure of the funnel provided in a specific embodiment of the present invention.

[0052] Figures 1-14 In the accompanying drawings, the reference numerals include:

[0053] 1 is the valve body assembly, 11 is the valve head, 111 is the liquid inlet, 112 is the liquid outlet, 113 is the first through hole, 114 is the second through hole, 115 is the main body, 116 is the first insertion part, 117 is the second insertion part, 118 is the protruding structure, and 12 is the valve bottle.

[0054] 2 is the diversion component, 21 is the valve ball, 22 is the handle, 23 is the water distribution component, 231 is the inclined blade, 24 is the rubber component, 25 is the clamping component, and 26 is the adapter component;

[0055] 3 is the filter element assembly, 31 is the filter element, 311 is the frame, 312 is the filter screen, and 313 is the filter screen cover;

[0056] 4 is the sewage discharge component, 41 is the funnel, 42 is the first sealing element, 43 is the first switching element, and 44 is the cover.

[0057] 5 is the first union, 6 is the second union, and 7 is the connector;

[0058] 8 is the drainage component, 81 is the drainage seat, 82 is the second seal, and 83 is the second switch. Detailed Implementation

[0059] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0060] The core of this invention is to provide a high-flow-rate backwashing pre-filter that has a large flow rate while allowing for a wide range of additional functions.

[0061] Please refer to Figures 1 to 14 This invention provides a high-flow-rate backwashing pre-filter, comprising a valve body assembly 1, a flow divider assembly 2, and a filter element assembly 3. The valve body assembly 1 includes a valve head 11 and at least two valve bottles 12. The sidewall of the valve head 11 has an inlet 111 and an outlet 112 communicating with the inner cavity of the valve head 11. Each valve bottle 12 is sealed on the circumferential surface of the valve head 11, and a first through hole 113 and a second through hole 114 are provided at the intersection of the valve head 11 and the valve bottle 12. The first through hole 113 is located near the inlet 111, and the second through hole 114 is located near the outlet 112. The core assembly 3 includes at least two filter elements 31, each filter element 31 being sealed and inserted into the interior of the corresponding valve bottle 12 through a second through hole 114; the diversion assembly 2 is disposed inside the valve head 11, used to divide the inner cavity of the valve head 11 into two parts, and the chamber on the side of the valve head 11 with the liquid inlet 111 is connected to the inner cavity of the valve bottle 12 through a first through hole 113, and the chamber on the side of the valve head 11 with the liquid outlet 112 is connected to the inner cavity of the filter element 31 through a second through hole 114.

[0062] like Figure 1 and Figure 2 As shown, valve body assembly 1 is the main body 115 structure of the pre-filter, used to install and support the flow distribution assembly 2 and the filter assembly, etc. Figure 2As shown, a through hole is provided on the side wall of the left end of the valve head 11 as a liquid inlet 111, and a through hole is provided on the side wall of the right end of the valve head 11 as a liquid outlet 112. Several hollow valve bottles 12 intersecting with itself are arranged around the same shaft section in the middle of the valve head 11. The valve bottles 12 can be interference-fitted to the valve head 11, or the valve bottles 12 can be threaded to the valve head 11. A sealing ring is provided on the circumference of the shaft section where the valve bottles 12 and the valve head 11 mate to ensure the sealing between the valve bottles 12 and the valve head 11. Furthermore, two independent through holes are provided on the side wall of the housing where the valve bottles 12 and the valve head 11 intersect, which are respectively the first through hole 113 and the second through hole 114. The first through hole 113 is located on the left side, and the second through hole 114 is located on the right side.

[0063] It should be noted that there are no restrictions on the type of valve head 11. For example, a straight valve head 11 with the inlet 111 and the outlet 112 arranged on the same line, or a right-angle valve head 11 with the inlet 111 and the outlet 112 distributed at an obtuse angle, is acceptable as long as the above requirements are met.

[0064] The flow divider assembly 2 is used to divide the inner cavity of the valve head 11 into two independent chambers. It is possible to provide a partition inside the valve head 11, and the partition is located between the location of the first through hole 113 and the location of the second through hole 114. The circumferential surface of the partition is in contact with the inner wall of the valve head 11. Furthermore, a sealing ring is provided between the partition and the valve head 11.

[0065] Each filter element 31 in filter element assembly 3 is used to filter the liquid flowing into the pre-filter, such as... Figure 2 As shown, the number of filter elements 31 is the same as the number of valve bottles 12. The filter elements 31 are inserted into the valve bottles 12 through the second through hole 114, and the circumferential surface of the filter elements 31 is in contact with the hole wall of the second through hole 114. Furthermore, a sealing ring is provided between the two to prevent the liquid in the inner cavity of the filter elements 31 and the chamber of the valve head 11 near the liquid outlet 112 from seeping out from the gap between the filter elements 31 and the second through hole 114.

[0066] In use, the liquid flows into the valve head 11 from the inlet 111, then flows into the inner cavity of the valve bottle 12 through the first through hole 113. The liquid then passes through the side wall of the filter element 31 and enters the interior of the filter element 31, and finally flows out through the second through hole 114 and the outlet 112 in sequence.

[0067] The pre-filter has several valve bottles 12 arranged on the circumference of the valve head 11. The liquid flowing into the valve head 11 from the inlet 111 can be diverted into each valve bottle 12 and filtered by each filter element 31. Thus, the pre-filter meets the filtration requirements of large flow rates of liquid. Furthermore, the filter element 31 is relatively small, so there is sufficient space between the filter element 31 and the valve bottle 12 to allow for the installation of functional components inside and outside each valve bottle 12, thereby enabling the additional implementation of various functions.

[0068] Based on this embodiment, the diversion assembly 2 includes a valve ball 21 and a handle 22; the valve ball 21 is rotatably embedded inside the valve head 11, and the circumferential surface of the valve ball 21 has several openings, and the interior of the valve ball 21 has a channel connecting each opening; the handle 22 is rotatably disposed on the valve body assembly 1, and the handle 22 is fixedly connected to the valve ball 21, so as to switch the high-flow backwash pre-filter to a filtration state, a backwash state, or a closed state; in the filtration state, the liquid flowing in from the inlet 111 can flow through the valve ball 21 and the first through hole 113 to the inner cavity of each valve bottle 12, and sequentially through the inner cavity of the filter element 31, the second through hole 114, and the outlet 112; in the backwash state, the liquid flowing in from the inlet 111 can flow through the valve ball 21 to the chamber connected to the outlet 112, and sequentially through the second through hole 114, the inner cavity of the filter element 31, the inner cavity of the valve bottle 12, and the opening of the side wall of the valve bottle 12; in the closed state, the liquid flowing in from the inlet 111 cannot pass through the valve ball 21.

[0069] Specifically, such as Figure 2 , Figure 5 and Figure 6 As shown, a valve ball 21 is fitted inside the valve head 11, and the valve ball 21 is located at the shaft segment where the first through hole 113 is located. The valve ball 21 can be rotated to selectively connect the inlet 111, the outlet 112, and the first through hole 113. One end of the handle 22 is located outside the valve body assembly 1 for the operator to rotate. The other end of the handle 22 extends into the inner cavity of the valve body assembly 1 and is fixedly connected to the valve ball 21. Thus, the handle 22 can drive the valve ball 21 to rotate, thereby adjusting the openings of the valve ball 21 to realize the switching of the working state of the pre-filter.

[0070] It is feasible to have through holes in the side walls of each valve bottle 12 or valve bottle 12 at a preset position, and to have plugs installed in each through hole.

[0071] It is feasible to set the angle at which the valve ball 21 is rotated when switching the working state of the pre-filter as the adjustment angle. The valve head 11 has an inlet 111 end, an outlet 112 end, and a valve bottle 12 arranged coplanarly around the middle structure of the valve head 11 with equal included angles. The angle of this included angle is not equal to the aforementioned adjustment angle. The openings in the valve ball 21 are also arranged coplanarly, and the requirement to switch the working state by rotating the valve ball 21 is achieved by setting the angle between the openings. Specifically, the circumferential openings of the valve ball 21 are divided into a first type of opening and a second type of opening. The first type of opening is arranged with equal included angles, and the included angle between adjacent first type openings is equal to that of the valve body assembly. In section 1, the included angles between the end of the outlet 112, the port of the inlet 111, and the valve bottle 12 are equal, and the included angles between each second type of opening and its adjacent first type of opening are equal, and the angle of this included angle is equal to the above-mentioned adjustment angle. In use, the first type of opening is connected to the inlet 111 and the first through hole 113, corresponding to the filtration state. The second type of opening is connected to the inlet 111 and the outlet 112, corresponding to the backwashing state. The part of the valve ball 21 without an opening is opposite to the inlet 111, corresponding to the closed state. By rotating the valve ball 21 according to the adjustment angle, the state can be switched between filtration, backwashing, and closed states.

[0072] It is feasible to have an inlet 111 at one end of the valve head 11 and an outlet 112 at the other end. Each valve bottle 12 is located on one side of the valve ball 21. The valve ball 21 has a set of openings on both sides. One set of openings meets the requirements of the filtration state, and the other set meets the requirements of the backwash state. When in use, the valve ball 21 is rotated so that the two sets of openings on the circumference of the valve ball 21 are activated respectively, or the part of the valve ball 21 without openings is opposite to the inlet 111, so that it can switch between the filtration state, the backwash state, and the closed state.

[0073] In use, the pre-filter is adjusted to the filtration state by rotating the valve ball 21 with the handle 22. After the liquid flows in from the inlet 111, it passes through the opening of the valve ball 21 and its internal channel to connect with each of the first through holes 113, so that the liquid flows into each valve bottle 12. Then, the liquid flows into the interior of each filter element 31 to achieve filtration, and finally flows out through the second through hole 114 and the outlet 112. The pre-filter is adjusted to the backwash state by rotating the valve ball 21 with the handle 22. After the liquid flows in from the inlet 111, it flows through the opening of the valve ball 21 and its internal channel to the chamber on the side of the outlet 112. Then, the liquid flows out from the interior of the filter element 31 and into the interior of the valve bottle 12, and finally flows out from the side wall of the valve bottle 12.

[0074] In this embodiment, the pre-filter can switch between filtration and backwashing states, so the pre-filter can both filter the liquid and perform backwashing, effectively ensuring the filtration effect of the pre-filter and extending its service life.

[0075] Based on the above embodiments, the valve head 11 includes an outer layer structure and an injection-molded plug-in structure disposed inside the outer layer structure. The outer layer structure is threadedly connected to the valve bottle. The plug-in structure includes a main body 115, a first plug-in portion 116, and a second plug-in portion 117. The first plug-in portion 116 is located in the middle of the main body 115, and each first plug-in portion 116 is sealed and plugged into the corresponding valve bottle 12. The first through hole 113 is located at the connection between the first plug-in portion 116 and the main body 115. The second plug-in portion 117 is collinear with the first plug-in portion 116, and the second plug-in portion 117 is located inside the first plug-in portion 116. The second through hole 114 is located at the free end of the second plug-in portion 117, and the second plug-in portion 117 is sealed and plugged into the corresponding filter element 31.

[0076] Specifically, such as Figure 2 , Figure 5 and Figure 6 As shown, the plug-in structure is a multi-port pipe, wherein the main body 115 is the main pipe connecting the branch pipes such as the first plug-in part 116 and the second plug-in part 117. Optionally, the peripheral wall of the main body 115 is press-fitted with the inner wall of the outer structure. Optionally, the plug-in structure and the outer structure are injection molded as a single structure. Specifically, the orientation of the main body 115 is the same as that of the middle part of the valve head 11, and the peripheral wall of the left end of the main body 115 is attached to the inner wall of the inlet 111 side of the valve head 11, and the peripheral wall of the right end of the main body 115 is attached to the inner wall of the outlet 112 side of the valve head 11. Thus, the liquid flowing into the valve head 11 will all enter the main body 115 through the first opening, and the liquid flowing out of the main body 115 will all flow out through the second opening and the outlet 112.

[0077] The main body 115 has a first through hole 113 on its side wall at the intersection with the branch pipe of the first insertion part 116. Furthermore, as Figure 2 As shown, the free end wall of the first plug-in part 116 is in contact with the corresponding valve bottle 12 wall. Furthermore, a sealing ring can be provided between the two, so that the liquid in the valve bottle 12 and the liquid near the inlet 111 in the valve head 11 will not flow out from the connection position between the valve bottle 12 and the first plug-in part 116.

[0078] The second connector 117, as a branch pipe, has a second through hole 114 along its length, and the second through hole 114 penetrates the side wall of the main body 115 and the free end of the second connector 117. Furthermore, as... Figure 5 and Figure 6 As shown, the second insertion part 117 is collinearly disposed inside the first insertion part 116, and the right side wall of the main body 115 located between the second insertion part 117 and the first insertion part 116 is closed. Therefore, liquid from the outlet 112 side will not flow from the right side wall of the main body 115 located between the second insertion part 117 and the first insertion part 116 to the valve bottle 12, ensuring that the liquids before and after filtration by the filter element 31 do not mix; furthermore, as Figure 2 As shown, the free end wall of the second insertion part 117 is in contact with the corresponding filter element 31 wall. Furthermore, a sealing ring can be provided between the two to ensure that the liquid in the filter element 31 and the liquid in the valve head 11 near the outlet 112 will not flow out from the connection position between the filter element 31 and the second insertion part 117.

[0079] Adjust the pre-filter to filtering mode, such as... Figure 3 As shown, the liquid flows in from the inlet 111 and then through the valve ball 21 and the first insertion part 116 into each valve bottle 12. After being filtered by the filter element 31, the liquid flows out from the outlet 112 through the second insertion part 117. Adjusting the pre-filter to backwash mode, as shown... Figure 4 As shown, the liquid flows in from the inlet 111 and then through the valve ball 21 and the second plug-in part 117 into each filter element 31. After passing through the filter element 31, the liquid flows into the valve bottle 12 and finally flows out from the opening on the side wall of the valve bottle 12. This pre-filter has a simple structure and is easy to assemble.

[0080] Optionally, each valve bottle 12 has a through hole on its side wall to allow the liquid inside the valve bottle 12 to flow out. When it is necessary to close the inside of the valve bottle 12, a plug can be inserted into the through hole, or a valve for control switch can be inserted into each through hole.

[0081] In some embodiments, the plug-in structure is sealed inside the outer structure; the valve bottle 12 is threadedly connected to the outer structure, and the cavity between the plug-in structure and the outer structure is connected to the inner cavity of each first plug-in part 116; the valve ball 21 is a three-way structure, with only one of the first plug-in parts 116 having a first through hole 113, and the remaining first plug-in parts 116 being closed to the valve bottle 12.

[0082] like Figure 2 As shown, the plug-in structure is fitted inside the outer structure. The circumferential surface of the main body 115 in the plug-in structure and the inner wall of the outer structure can be connected by thread or interference fit. Furthermore, a sealing ring can be sandwiched between the circumferential surface of the main body 115 and the outer structure to ensure that the liquid in the cavity between the integrated structure and the outer structure will not flow out from the gap between them.

[0083] The outer structure has a branch joint in the middle. The branch joint is a hollow structure to allow the first insertion part 116 and the second insertion part 117 to pass through. The branch joint is threaded to the valve bottle 12. Furthermore, a sealing ring is provided between the opposing circumferential surfaces of the branch joint and the valve bottle 12 to prevent the liquid in the valve bottle 12 from flowing out. Furthermore, a sealing gasket is sandwiched between the end of the valve bottle 12 and the valve head 11 to achieve double protection and further prevent the liquid in the valve bottle 12 from flowing out.

[0084] like Figure 6As shown, the cross-sectional diameter of the inner hole of the first insertion part 116 is larger than the cross-sectional diameter of the main body 115, and the portion of the peripheral wall of the first insertion part 116 that protrudes from the main body 115 is not closedly connected to the main body 115, thereby allowing the cavity between the insertion structure and the outer layer structure to communicate with the inner cavity of the first insertion part 116; furthermore, as Figure 2 As shown, the tubular end of the outer structure from which the first insertion part 116 extends has external threads for threaded connection to the valve bottle 12. Furthermore, a sealing ring is sandwiched between the circumferential surface and end of the valve bottle 12 and the opposite sidewall of the outer structure to prevent liquid from seeping out of the cavity between the circumferential surface of the insertion structure and the outer structure.

[0085] Since the inner cavity of each first plug-in part 116 is connected to the inner cavity between the plug-in structure and the outer layer structure, the main body 115 peripheral wall is provided with a first plug-in part 116 only at the intersection of one of the first plug-in parts 116, and the intersection of the main body 115 peripheral wall with other first plug-in parts 116 is closed.

[0086] The valve ball 21 adopts a three-way structure. Rotating the valve ball 21 adjusts the pre-filter to the filtration state, such as... Figure 3 As shown, the two openings of the valve ball 21 are connected to the inlet 111 and the first insertion hole, respectively. The remaining opening on the valve ball 21 is sealed relative to the side wall of the main body 115. Liquid flows in from the inlet 111 and through the valve ball 21 to the first through hole 113. The liquid flows into the inner cavity between the insertion structure and the outer structure, and then into the inner cavity of each valve bottle 12. After being filtered by the filter element 31, the liquid flows out through the outlet 112 via each second insertion part 117. Adjusting the pre-filter to backwash mode, such as... Figure 4 As shown, the two openings of the valve ball 21 are connected to the inlet 111 and the outlet 112 respectively. The remaining opening on the valve ball 21 is sealed relative to the side wall of the main body 115, and the side wall of the valve ball 21 blocks the first through hole 113. After the liquid flows in from the inlet 111, it flows through the valve ball 21 to the cavity on the side of the valve head 11 with the outlet 112. Then the liquid flows through each of the second through holes 114 to the interior of each filter element 31. After passing through the filter element 31, the liquid flows into the valve bottle 12 and finally flows out from the opening on the side wall of the valve bottle 12. This setting further simplifies the structure of the pre-filter.

[0087] Preferred, such as Figure 2 As shown, the valve head 11 has an inlet 111 at one end, an outlet 112 at one end, and a valve bottle 12 with a first through hole 113 at the intersection with the main body 115. The included angle between any two of these three parts is 90 degrees. The included angle between the openings on the valve ball 21 is also 90 degrees. To adjust, simply rotate the handle 22 90 degrees.

[0088] Based on the above embodiment, a drain assembly 4 is inserted into the tail end of the inner cavity of the bottom valve bottle 12. The drain assembly 4 includes a funnel 41, a first seal 42, and a first switch 43. The top end of the funnel 41 is sealed and inserted into the bottom valve bottle 12, and the bottom opening of the funnel 41 communicates with the through hole in the middle of the first seal 42. The tail end of the bottom valve bottle 12 has a third through hole, and the bottom end of the first seal 42 is sealed and inserted into the third through hole. The through hole in the middle of the first seal 42 is provided with a first switch 43 for opening or closing the through hole in the middle of the first seal 42.

[0089] like Figure 2 and Figure 7 As shown, a drain assembly 4 is provided at the lower end of the lower valve bottle 12 to drain impurities from the valve bottle 12. The funnel 41 is fitted inside the lower valve bottle 12, and a sealing ring is sandwiched between the funnel 41 and the valve bottle 12 to ensure that all impurities in the upper cavity of the valve bottle 12 fall into the funnel 41.

[0090] Preferred, such as Figure 2 and Figure 12 As shown, the tail end of the filter element 31 extends into the inner cavity of the funnel 41, and the bottom of the filter element 31 has a hollow spiral structure. When the liquid flows downward through the spiral structure, it has a large force, which is conducive to pushing the impurities out, so as to ensure that the impurities are discharged cleanly.

[0091] like Figure 7 As shown, the first sealing element 42 has a cylindrical structure, and its lower end is inserted into a third through hole located on the lower end wall of the lower valve bottle 12. A sealing ring is sandwiched between the circumferential surface of the first sealing element 42 and the side wall of the third through hole to further prevent liquid in the valve bottle 12 from seeping out from the gap between the circumferential wall of the third through hole and the first sealing element 42. Furthermore, the upper end of the first sealing element 42 is fixedly connected to the lower end of the funnel 41. This can be achieved by an interference fit between the two, or, as shown in the diagram. Figure 14 As shown, the lower end of the funnel 41 has an octagonal rib structure, and there is a gap between the rib structure and the body of the funnel 41, such as... Figure 7 As shown, the upper end of the first sealing member 42 has an octagonal cross-section and is inserted into the above-mentioned gap; a first switch member 43 is provided in the middle through hole of the first sealing member 42, and the first switch member 43 can be a plug or a valve, etc.

[0092] A through hole is provided at the lower end of the funnel 41, allowing impurities inside the funnel 41 to flow into the through hole in the middle of the first seal 42. During use, the pre-filter should be adjusted to backwash mode. Figure 4As shown, when the first switch 43 is opened, the liquid and impurities in the lower valve bottle 12 first flow to the funnel 41, and then continue to flow downward into the through hole in the middle of the first seal 42. Finally, they flow out from the opened first switch 43 or the through hole in the middle of the first seal 42. Adjust the pre-filter to the filtering state and then close the first switch 43.

[0093] Based on the above embodiment, a drainage assembly 8 is inserted at the tail end of the inner cavity of the top valve bottle 12. The drainage assembly includes a drainage seat 81, a second sealing member 82, and a second switch member 83. The top end of the top filter element 31 is sealed and inserted into the bottom end of the drainage seat 81. The top end of the drainage seat 81 is sealed and inserted into the through hole in the middle of the second sealing member 82. The inner cavity of the top filter element 31 is connected to the through hole in the middle of the second sealing member 82 through the drainage seat 81. The tail end of the top valve bottle 12 has a fourth through hole. The top end of the second sealing member 82 is sealed and inserted into the fourth through hole. The second switch member 83 for opening or closing the second sealing member 82 is provided in the through hole in the middle of the second sealing member 82.

[0094] like Figure 2 and Figure 8 As shown, a drainage assembly 8 is provided at the upper end of the upper valve bottle 12 for draining the liquid inside the filter element 31 in the upper valve bottle 12. The drainage seat 81 is a cylindrical structure with an opening at the upper end of the valve element 31 in the upper valve bottle 12. The peripheral wall of the opening is inserted into the through hole in the middle of the drainage seat 81, and a sealing ring is sandwiched between the drainage seat 81 and the peripheral wall of the opening to seal the gap between the drainage seat 81 and the filter element 31, so that the liquid inside the upper filter element 31 can flow into the drainage seat 81.

[0095] like Figure 8 As shown, the second sealing element 82 is also a cylindrical structure, and the upper end of the second sealing element 82 is inserted into the fourth through hole opened on the upper end wall of the upper valve bottle 12. A sealing ring is sandwiched between the circumferential surface of the second sealing element 82 and the side wall of the fourth through hole to further prevent the liquid in the valve bottle 12 from seeping out from the gap between the circumferential wall of the fourth through hole and the second sealing element 82. Furthermore, the lower end of the second sealing element 82 is inserted into the upper end of the drain seat 81, and the two ends of the middle through hole of the drain seat 81 are open, thereby connecting the inner cavity of the upper filter element 31 and the middle through hole of the second sealing element 81. Thus, the liquid in the inner cavity of the upper filter element 31 can flow into the middle through hole of the second sealing element 82 after flowing into the drain seat 81. A sealing ring is sandwiched between the drain seat 81 and the second sealing element 82 to seal the gap between the drain seat 81 and the second sealing element 82.

[0096] A second switch 83 is provided in the central through hole of the second seal 82. The second switch 83 can be a ball valve or a two-position three-way valve, etc. When in use, adjust the pre-filter to the filtering state, open the second switch 83, and the liquid flowing into the inner cavity of the upper filter element 31 first flows through the central through hole of the drain seat 81, and then flows out from the central through hole of the second seal 82 or the opened second switch 83.

[0097] Preferably, the first switching element 43 and the second switching element 83 are valves; alternatively, such as... Figure 7 and Figure 8 As shown, the valve is a ball valve, with one end inserted into the third or fourth through hole and the other end located outside the valve cylinder 12. Alternatively, a two-position three-way valve can be used, with one end having an outlet inserted into the third or fourth through hole and both ends having inlets located outside the valve cylinder 12. Of course, any other type of valve can be used, as long as it can achieve the above functions. This configuration facilitates operation, and the second switch 83 facilitates connection to water-using equipment via pipeline.

[0098] Optionally, a hollow cover 44 is fitted on the outer side of the tail end of each valve bottle 12. The cover 44 is threadedly connected to the corresponding first sealing element 42. This arrangement helps to improve the stability and high pressure resistance of the pre-filter.

[0099] Based on the above embodiment, the valve ball 21 is disposed inside the valve head 11 through the rubber component 24. The valve ball 21 is rotatably fitted into the inner cavity of the rubber component 24 to reduce wear between the valve ball 21 and the valve head 11 and to seal the gap between the valve ball 21 and the valve head 11.

[0100] Specifically, the rubber component 24 adopts a one-piece molded rubber structure, allowing it to be embedded in the inner cavity of the valve head 11. The two circumferential surfaces of the rubber component 24 are in contact with the inner wall surface of the valve head 11, ensuring that all liquid flowing in from the inlet 111 flows into the rubber component 24, and all liquid flowing out of the rubber component 24 flows according to a preset flow path; such as Figure 10 As shown, the rubber part 24 has openings at its left end, right end, and middle sidewall. After assembly, as... Figure 2 As shown, the left end of the rubber part 24 is located on the side where the valve head 11 has the liquid inlet 111, the right end is located on the side where the valve head 11 has the liquid outlet 112, and the opening in the middle is opposite to the first through hole. The valve ball 21 is embedded in the inner cavity of the rubber part 24, and the peripheral wall of the valve ball 21 is tightly fitted with the inner wall of the rubber part 24, thereby preventing liquid from flowing through the gap between the valve ball 21 and the rubber part 24.

[0101] In use, the liquid flowing in from the inlet 111 first flows into the inner cavity of the rubber component 24, and then flows through the opening of the valve ball 21 and its internal channel and the opening of the rubber component 24 to the first or second through hole to meet the requirements of filtration and backwashing. In this embodiment, the gap between the valve ball 21 and the valve head 11 is sealed by the rubber component 24 to ensure the function of the valve ball 21 and to reduce wear between the valve ball and the valve head, thereby effectively extending the service life of the pre-filter.

[0102] In some embodiments, the inner cavity of the valve head 11 has a protrusion structure 118, and the first end of the rubber part 24 abuts against the protrusion structure 118; a clamping member 25 is threadedly connected to the inner cavity of the valve head 11 having an inlet port 111, and the clamping member 25 abuts against the second end of the rubber part 24.

[0103] like Figure 2 As shown, the two ends of the rubber part 24 abut against the protruding structure 118 and the clamping part 25 inside the valve head 11, respectively, thereby effectively preventing misalignment between the rubber part 24 and the valve ball 21, so as to ensure the function of the pre-filter. Preferably, the central through hole of the clamping part 25 is a countersunk hole, and the end of the rubber part 24 is inserted into the larger cross-sectional area of ​​the countersunk hole, so as to effectively ensure the conductive connection between the rubber part 24 and the clamping part 25, and facilitate the installation of the clamping part 25 and the rubber part 24 into place.

[0104] Furthermore, a limiting structure is provided at the tail end of the clamping member 25. After the clamping member 25 is screwed into the valve head 11, the limiting structure abuts against the bottom of the groove at the end of the valve head 11, thereby preventing the clamping member 25 from being screwed in too much, so as to prevent the valve ball 21 from being over-compressed and unable to rotate.

[0105] It should be noted that the clamping member 25 has a groove on its circumference for setting a sealing ring, thereby effectively preventing liquid in the valve head 11 from flowing into the valve bottle 12 through the gap between the valve head 11 and the clamping member 25.

[0106] Based on the above embodiments, the diversion assembly 2 also includes an adapter 26, with the first end of the adapter 26 being sealed and inserted into the filter element 31 and the second end being sealed and inserted into the free end of the second insertion part 117, so that the filter element 31 is located at the center of the valve bottle 12.

[0107] Specifically, such as Figure 2 As shown, the second through hole 114 is located on the side near the liquid outlet 112, and the first through hole 113 is located on the side near the liquid inlet 111. In order to set the filter element 31 at the central axis position of the valve bottle 12, the inner cavity of the filter element 31 is connected to the second through hole 114 by the adapter 26 with the axis being a bend line.

[0108] The adapter 26 is a hollow, bent tube structure, such as... Figure 2As shown, one end of the adapter 26 is inserted into the second through hole 114, and a sealing ring is sandwiched between the adapter 26 and the peripheral wall of the second through hole 114 to achieve a sealed connection, thereby effectively preventing liquid in the filter element 31 from leaking out from the connection between the two or liquid in the valve bottle 12 from leaking in from the connection between the two; the other end of the adapter 26 is inserted into the filter element 31, and another sealing ring is sandwiched between the adapter 26 and the filter element 31 to achieve a sealed connection, thereby effectively preventing liquid in the filter element 31 from leaking out from the connection between the two or liquid in the valve bottle 12 from leaking in from the connection between the two.

[0109] This configuration allows the filter element 31 to be positioned on the axis of the valve bottle 12 via the adapter 26, facilitating assembly and maintenance, and ensuring the filtration and backwashing performance of the pre-filter.

[0110] Based on any of the above embodiments, the filter element 31 is provided with a water distribution component 23 on its circumferential surface. The water distribution component 23 is sealed and inserted into the valve bottle 12, and the water distribution component 23 is located at the end of the valve bottle 12 near the valve head 11. The end of the water distribution component 23 away from the valve head 11 has an inclined blade 231 to guide the liquid to flow in a swirling direction.

[0111] Specifically, such as Figure 9 As shown, the water distributor 23 has a cylindrical structure, and the filter element 31 passes through the through hole in the middle of the water distributor 23. Optionally, the water distributor 23 is interference-fitted into the inside of the valve bottle 12, or, as shown... Figure 2 As shown, the end of the peripheral surface of the water distributor 23 has a protrusion, and the end of the valve bottle 12 has a groove. The two are connected by the groove and the protrusion and pressed by the valve head 11 to limit the position of the water distributor 23. Furthermore, an annular groove is provided on the peripheral surface of the water distributor 23 so as to set a sealing ring in the annular groove to prevent the liquid in the valve bottle 12 from seeping out from the gap between the peripheral surface of the water distributor 23 and the inner wall of the valve bottle 12.

[0112] like Figure 9 As shown, the lower end face of the water separator 23 has several through holes around its circumference, allowing liquid to pass through and flow into the valve bottle 12. Each through hole has an inclined blade 231 at its end, and each inclined blade 231 faces the same direction, so that the liquid flowing through the water separator 23 flows in a swirling direction. This arrangement is beneficial to promote the filtration of liquid through the filter element 31 after entering the valve bottle 12.

[0113] Based on any of the above embodiments, the filter element 31 includes a frame 311 and a filter screen 312. The frame 311 has a cylindrical structure, and the filter screen 312 is sleeved on the outside of the frame 311.

[0114] Specifically, such as Figure 12As shown, the frame 311 has a cylindrical structure, and a filter screen 312 is fitted on the periphery of the frame 311. The filter screen 312 can be fixed by a clamp or pressed down by a filter screen cover 313. Several through holes are opened on the periphery of the frame 311 covered by the filter screen 312, so that the liquid can pass through the filter screen 312 and the frame 311 and enter the interior of the filter element 31. At the same time, the filtration of the liquid is completed. In this embodiment, the filter screen 312 is not easily deformed by the support of the frame 311, so as to ensure the filtration function of the filter element 31.

[0115] When necessary, such as Figure 12 As shown, annular grooves are provided on the upper and lower circumferential surfaces of the frame 311 to set a sealing ring, so as to prevent liquid from flowing through the gap between the end of the filter screen 312 and the end of the frame 311, thereby preventing the filtered liquid from mixing with the pre-filtered windshield liquid.

[0116] Optionally, in conjunction with the embodiment described above that includes the first switching element 43, such as... Figure 13 As shown, the filter cover 313 has a hollow structure. The filter element 31 passes through the through hole in the middle of the filter cover 313 and extends to the tail end of the valve bottle 12 to communicate with the first switch 43. The inner wall of the filter cover 313 has a protrusion and a groove is formed on the circumference of the filter element 31. The protrusion and the groove cooperate to achieve a fixed connection between the filter cover 313 and the filter element 31.

[0117] Preferably, filter screen 312 is made of 361 stainless steel to ensure filtration effect and effectively extend the service life of the pre-filter.

[0118] In some embodiments, the inlet 111 is sealed with a first union 5; in some embodiments, the outlet 112 is sealed with a second union 6.

[0119] like Figure 1 and Figure 2 As shown, a first union 5 is provided at the end of the inlet 111 of the valve head 11, which can be welded together. Similarly, a second union 6 is provided at the end of the outlet 112 of the valve head 11. With this configuration, the pre-filter can be easily connected to the end of the water pipe through the first union 5 and the second union 6.

[0120] Based on some embodiments, the first union 5 is collinear with the end of the valve head 11 having the inlet 111 and is threadedly connected by the connector 7, and the second union 6 is collinear with the end of the valve head 11 having the outlet 112 and is threadedly connected by the connector 7.

[0121] like Figure 2As shown, the circumferential surface of the first union 5 and the circumferential surface of the valve head 11 with the liquid inlet 111 are both externally threaded, and are threaded to the first union 5 and the end of the valve head 11 with the liquid inlet 111 through the internal thread in the through hole in the middle of the connector 7.

[0122] Similarly, such as Figure 2 As shown, the circumferential surface of the second union 6 and the circumferential surface of the valve head 11 with the outlet 112 are both externally threaded, and are threadedly connected to the second union 6 and the valve head 11 with the outlet 112 through the internal thread in the through hole in the middle of the connector 7.

[0123] Furthermore, a gasket is provided between the ends of the second union 6 and the valve head 11 that are opposite to each other, to prevent liquid from leaking out from the connection point.

[0124] Optionally, the first union 5 has an external thread on its circumferential surface and an internal thread at the end of the valve head 11 with the inlet 111, so that the first union 5 can be screwed into the end of the valve head 11 with the inlet 111; similarly, the second union 6 has an external thread on its circumferential surface and an internal thread at the end of the valve head 11 with the outlet 112, so that the second union 6 can be screwed into the end of the valve head 11 with the outlet 112.

[0125] In some embodiments, a pressure gauge is provided on the pipe wall of the valve head 11 with the outlet 112, and the test contact of the pressure gauge extends into the inner cavity of the valve head 11. In use, the water pressure of the output liquid of the filter can be obtained through the pressure gauge, which helps to ensure water safety and stability.

[0126] Preferably, the pressure gauge and the handle 24 are located on the same side outside the valve head 11. In use, the pressure gauge and the handle 24 are both positioned away from the cavity. This arrangement makes it easy to operate the handle 24 and to observe the pressure gauge.

[0127] In some embodiments, the interior of the filter element 31 is filled with scale-inhibiting filter media. During filtration, the liquid flows into the inner cavity of the filter element 31 in sequence, and the liquid first flows through the scale-inhibiting filter media in the inner cavity of the filter element 31. This arrangement effectively prevents the generation of a large amount of scale in the pipeline connected to the outlet 112 of the filter, so as to ensure the purity of the water used.

[0128] It should be noted that there are no restrictions on the type of scale inhibitor filter media, such as silicon phosphate crystal scale inhibitor filter media, calcium sulfite scale inhibitor filter media, etc., as long as they can achieve the above functions.

[0129] Optionally, the scale-inhibiting filter media is filled inside the filter element 31 by a cloth tape, or alternatively, the scale-inhibiting filter media is filled inside the filter element 31 by a bag-shaped filter screen. This arrangement facilitates the assembly, maintenance, and replacement of the filter media.

[0130] It should be noted that the relational terms such as "first" and "second" mentioned above are only used to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities; the terms "upper surface," "lower surface," "top," and "bottom" and the directional terms "upper," "lower," "left," and "right" mentioned above are defined based on the accompanying drawings in the specification.

[0131] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0132] The high-flow backwash pre-filter provided by this invention has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A high flux backflush prefilter characterized by, include: The valve body assembly (1) includes a valve head (11) and at least two valve bottles (12). The side wall of the valve head (11) has an inlet (111) and an outlet (112) communicating with the inner cavity of the valve head (11). Each valve bottle (12) is sealed on the circumferential surface of the valve head (11). A first through hole (113) and a second through hole (114) are provided at the intersection of the valve head (11) and the valve bottle (12). The first through hole (113) is close to the inlet (111), and the second through hole (114) is close to the outlet (112). The filter element assembly (3) includes at least two filter elements (31), each filter element (31) being sealed and inserted into the interior of the corresponding valve bottle (12) through the second through hole (114); The diversion assembly (2) is located inside the valve head (11) and is used to divide the inner cavity of the valve head (11) into two parts. The chamber on the side of the valve head (11) with the liquid inlet (111) is connected to the inner cavity of the valve bottle (12) through the first through hole (113), and the chamber on the side of the valve head (11) with the liquid outlet (112) is connected to the inner cavity of the filter element (31) through the second through hole (114).

2. The high flux backflush prefilter of claim 1, wherein, The diversion assembly (2) includes a valve ball (21) and a handle (22); The valve ball (21) is rotatably embedded inside the valve head (11), and the circumferential surface of the valve ball (21) has several openings, and the interior of the valve ball (21) has a channel connecting each of the openings; The handle (22) is rotatably disposed on the valve body assembly (1), and the handle (22) is fixedly connected to the valve ball (21) to switch the high-flow backwash pre-filter to a filtering state, a backwashing state, or a closed state. The filtration state is such that the liquid flowing in from the inlet (111) can flow through the valve ball (21) and the first through hole (113) to the inner cavity of each valve bottle (12), and then through the inner cavity of the filter element (31), the second through hole (114) and the outlet (112) in sequence. The backwashing state is that the liquid flowing in from the inlet (111) can flow through the valve ball (21) to the chamber connected to the outlet (112), and then pass through the second through hole (114), the inner cavity of the filter element (31), the inner cavity of the valve bottle (12), and the opening of the side wall of the valve bottle (12) in sequence. The closed state means that the liquid flowing into the inlet (111) cannot pass through the valve ball (21).

3. The high-flow-rate backwashing pre-filter according to claim 2, characterized in that, The valve head (11) includes an outer structure and a plug-in structure disposed inside the outer structure, wherein the outer structure is threadedly connected to the valve bottle (12). The plug-in structure includes a main body (115), a first plug-in part (116), and a second plug-in part (117). The first plug-in portion (116) is located in the middle of the main body (115), and each of the first plug-in portions (116) is sealed and plugged into the corresponding valve bottle (12), and the first through hole (113) is located at the connection between the first plug-in portion (116) and the main body (115); The second plug-in portion (117) is collinear with the first plug-in portion (116), and the second plug-in portion (117) is located inside the first plug-in portion (116). The second through hole (114) is located at the free end of the second plug-in portion (117), and the second plug-in portion (117) is sealed and plugged into the corresponding filter element (31).

4. The high-flow-rate backwashing pre-filter according to claim 3, characterized in that, The plug-in structure is sealed and sleeved inside the outer structure; The valve bottle (12) is sealed to the outer structure by a threaded connection, and the cavity between the plug-in structure and the outer structure is connected to the inner cavity of each of the first plug-in parts (116). The valve ball (21) has a three-way structure, with only one of the first plug-in parts (116) having the first through hole (113), and the remaining first plug-in parts (116) being closed to the valve bottle (12).

5. The high-flow-rate backwashing pre-filter according to claim 4, characterized in that, A drain assembly (4) is inserted into the tail end of the inner cavity of the bottom valve bottle (12). The drain assembly (4) includes a funnel (41), a first seal (42), and a first switch (43). The top of the funnel (41) is sealed and inserted into the bottom valve bottle (12). The bottom opening of the funnel (41) is connected to the through hole in the middle of the first seal (42). The tail end of the bottom valve bottle (12) has a third through hole. The bottom end of the first seal (42) is sealed and inserted into the third through hole. The first switch (43) for opening or closing the through hole in the middle of the first seal (42) is provided in the through hole in the middle of the first seal (42). A drainage assembly (8) is inserted at the tail end of the inner cavity of the valve bottle (12) at the top. The drainage assembly includes a drainage seat (81), a second seal (82), and a second switch (83). The top end of the filter element (31) at the top is sealed and inserted into the bottom end of the drainage seat (81). The top end of the drainage seat (81) is sealed and inserted into the through hole in the middle of the second seal (82). The inner cavity of the filter element (31) at the top is connected to the through hole in the middle of the second seal (82) through the drainage seat (81). The tail end of the valve bottle (12) at the top has a fourth through hole. The top end of the second seal (82) is sealed and inserted into the fourth through hole. The through hole in the middle of the second seal (82) is provided with a second switch (83) for opening or closing the second seal (82).

6. The high-flow-rate backwashing pre-filter according to claim 2, characterized in that, The valve ball (21) is disposed inside the valve head (11) via a rubber component (24). The valve ball (21) rotates and fits into the inner cavity of the rubber component (24) to reduce wear between the valve ball (21) and the valve head (11) and to seal the gap between the valve ball (21) and the valve head (11). The inner cavity of the valve head (11) has a protruding structure (118), and the first end of the rubber part (24) abuts against the protruding structure (118); the valve head (11) has a threaded clamping member (25) in the inner cavity of the end of the liquid inlet (111), and the clamping member (25) abuts against the second end of the rubber part (24).

7. The high-flow-rate backwash pre-filter according to any one of claims 1 to 6, characterized in that, The diversion assembly (2) also includes an adapter (26), the first end of which is sealed and inserted into the filter element (31), and the second end is sealed and inserted into the free end of the second insertion part (117), so that the filter element (31) is located at the center of the valve bottle (12).

8. The high-flow-rate backwash pre-filter according to any one of claims 1 to 6, characterized in that, The filter element (31) is fitted with a water distribution component (23) on its circumference. The water distribution component (23) is sealed and inserted into the valve bottle (12). The water distribution component (23) is located at the end of the valve bottle (12) near the valve head (11). The end of the water distribution component (23) away from the valve head (11) has an oblique blade (231) to guide the liquid to flow in a swirling direction.

9. The high-flow-rate backwash pre-filter according to any one of claims 1 to 6, characterized in that, The filter element (31) includes a frame (311) and a filter screen (312). The frame (311) is a cylindrical structure, and the filter screen (312) is sleeved on the outside of the frame (311).

10. The high-flow-rate backwash pre-filter according to any one of claims 1 to 6, characterized in that, The inlet (111) is sealed with a first union (5), and the outlet (112) is sealed with a second union (6). The first union (5) is collinear with the end of the valve head (11) having the liquid inlet (111) and is threadedly connected by the connector (7). The second union (6) is collinear with the end of the valve head (11) having the liquid outlet (112) and is threadedly connected by the connector (7).

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