A two-stage prefilter

Abstract

The application discloses a two-stage pre-filter and relates to the technical field of filters. The valve body assembly of the two-stage pre-filter comprises a valve head, a first valve bottle and a second valve bottle, and the first valve bottle and the second valve bottle are both sealed around the circumferential surface of the middle part of the valve head. The shunt assembly is arranged in the interior of the valve head and is used for separating the inner cavity of the valve head into a first chamber and a second chamber. The side wall of the first chamber is provided with an opening for liquid to flow into the first chamber, and the side wall of the second chamber is provided with an opening for liquid to flow out of the second chamber. The first valve bottle is provided with a first through hole at the intersection of the pipe wall of the first chamber, and the second valve bottle is provided with a second through hole at the intersection of the pipe wall of the second chamber. The first filter element of the filter element assembly is inserted into the interior of the first valve bottle, the top end outlet of the first filter element is communicated with the inner cavity of the second valve bottle and is independent of the inner cavity of the second filter element, and the second filter element is sealingly inserted into the interior of the second valve bottle through the second through hole. The pre-filter effectively improves the situation that blockage is prone to occur.

Description

Technical Field

[0001] This invention relates to the field of filter technology, and more specifically, to a two-stage 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 improve filtration efficiency, pre-filters typically have filtration structures on both the inner and outer sides of the first frame to filter water. While this effectively improves water filtration, the limited gap between the two filtration layers means that impurities accumulate between them after a period of use, easily leading to blockage.

[0004] In conclusion, how to change the current situation where the pre-filter of a dual-filtration structure is prone to clogging 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 two-stage pre-filter that effectively improves the current situation where clogging is prone to occur.

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

[0007] A secondary pre-filter, comprising:

[0008] The valve body assembly includes a valve head, a first valve bottle, and a second valve bottle, both of which are sealed around the circumferential surface of the valve head in the middle.

[0009] A flow divider assembly is disposed inside the valve head to divide the inner cavity of the valve head into a first chamber and a second chamber. The side wall of the first chamber has an opening for liquid to flow into the first chamber, and the side wall of the second chamber has an opening for liquid to flow out of the second chamber. A first through hole is provided at the intersection of the first valve bottle and the pipe wall of the first chamber, and a second through hole is provided at the intersection of the second valve bottle and the pipe wall of the second chamber.

[0010] The filter element assembly includes a first filter element and a second filter element. The first filter element is inserted into the interior of the first valve bottle, and the top outlet of the first filter element is connected to the inner cavity of the second valve bottle but independent of the inner cavity of the second filter element. The second filter element is sealed and inserted into the interior of the second valve bottle through the second through hole.

[0011] Preferably, the valve head includes an inner layer structure and an outer layer structure, wherein the inner layer structure is a four-way pipe, including a main pipe, a first branch pipe, a second branch pipe and a third branch pipe;

[0012] The first end of the main pipe is sealed and inserted into the first end of the outer structure, and the second end of the main pipe is sealed and inserted into the second end of the outer structure. The first chamber is located at the first end of the main pipe, and the second chamber is located at the second end of the main pipe. The main pipe passes through the inner cavity of the first branch pipe, and the inner cavities of the first end and the second end of the first branch pipe are independent of each other.

[0013] The first end of the first branch pipe is sealed and inserted into the first valve bottle, and the second end is sealed and inserted into the second valve bottle;

[0014] The second branch pipe and the third branch pipe are both located inside the first branch pipe. The second branch pipe is connected to the inner cavity of the second end of the first branch pipe. The second branch pipe is sealed and inserted into the first filter element. The second through hole is the inner cavity of the third branch pipe.

[0015] The outer structure has two hollow threaded structures in the middle, which are threaded to connect the first valve bottle and the second valve bottle.

[0016] Preferably, the splitter assembly includes a first adapter and a second adapter;

[0017] The bottom end of the first adapter is sealed and inserted into the first filter element, and the top end is sealed and inserted into the second branch pipe, so that the first filter element is located at the center of the first valve bottle;

[0018] The second adapter is sealed at the top and inserted into the second filter element, and sealed at the bottom and inserted into the third branch pipe, so that the second filter element is located at the center of the second valve bottle.

[0019] Preferably, the second valve bottle is located on top of the valve head, and the diversion assembly further includes a valve ball and a handle;

[0020] The valve ball is rotatably embedded in the first chamber, and the valve ball has three openings on its circumference, and the valve ball has a channel inside that connects each of the openings;

[0021] 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 secondary pre-filter to a filtering state, a backwashing state, or a closed state;

[0022] The filtration state is such that the liquid flowing into the first chamber can flow through the valve ball and the first through hole to the inner cavity of the first valve bottle, and sequentially through the first filter element, the inner cavity of the second valve bottle, the second filter element, the second through hole, and the second chamber;

[0023] The backwashing state is that the liquid flowing into the first chamber can flow through the valve ball and the second through hole to the inner cavity of the second filter element, and then sequentially through the second valve bottle, the first filter element, the first valve bottle, and the drain port at the tail end of the first valve bottle;

[0024] The closed state means that liquid flowing into the first chamber cannot pass through the valve ball.

[0025] Preferably, the first valve bottle is located at the bottom of the valve head, and a drain assembly is inserted into the tail end of the inner cavity of the first valve bottle;

[0026] The sewage discharge assembly includes a funnel and a hollow first sealing element, wherein the bottom opening of the funnel communicates with a through hole in the middle of the first sealing element.

[0027] The tail end of the first valve bottle has a third through hole, the bottom end of the first sealing member is sealed and inserted into the third through hole, and a first switch member for opening or closing the middle through hole of the first sealing member is provided in the middle through hole of the first sealing member.

[0028] Preferably, the tail end of the second valve bottle is provided with a water outlet assembly, the water outlet assembly including a hollow connector and a hollow second sealing member, the bottom end of the connector is sealed and inserted into the second filter element, and the top end of the connector is sealed and inserted into the bottom end of the second sealing member; the tail end of the second valve bottle has a fourth through hole, the top end of the second sealing member is sealed and inserted into the fourth through hole, and a second switch member for opening or closing the middle through hole of the second sealing member is provided in the middle through hole of the second sealing member;

[0029] Alternatively, the second valve bottle is located on top of the valve head, and the peripheral wall of the second valve bottle is a closed structure.

[0030] Preferably, the valve ball is disposed in the first chamber 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;

[0031] And / or, the valve head has a protruding structure between the first chamber and the second chamber, the first end of the rubber component abuts against the protruding structure, a clamping member is threadedly connected in the first chamber, and the clamping member abuts against the second end of the rubber component.

[0032] Preferably, the first filter element is fitted with a first water distribution component on its circumferential surface. The first water distribution component is sealed and inserted into the first valve bottle, and the first water distribution component is located at the end of the first valve bottle near the valve head. The end of the first water distribution component away from the valve head has an inclined blade to guide the liquid to flow in a swirling direction.

[0033] And / or, the second filter element is provided with a second water distribution element on its circumferential surface, the second water distribution element is sealed and inserted into the second valve bottle, and the second water distribution element is located at the end of the second valve bottle near the valve head, and the end of the second water distribution element away from the valve head has the inclined blade to guide the liquid to flow in a swirling direction.

[0034] Preferably, both the first filter element and the second filter element include a first frame and a first filter screen, wherein the first frame is a cylindrical structure and the first filter screen is sleeved on the outside of the corresponding first frame;

[0035] And / or, both the first filter element and the second filter element include a first filter screen cover, each of the first frames is inserted into the central through hole of the corresponding first filter screen cover, and the inner wall of each first filter screen cover abuts against the corresponding first filter screen.

[0036] Preferably, the first filter element includes a second frame and a plurality of stacked plates. The second frame is provided with stacked plates, a base support, a compression spring and a third filter cover in sequence from top to bottom on its circumferential surface. One end of the compression spring abuts against the third filter cover and the other end abuts against the base support. The second filter element includes a third frame and a second filter. The third frame is a cylindrical structure and the second filter is sleeved on the outside of the third frame.

[0037] And / or, the tail end of the third frame is fitted with a second filter cover, and the bottom inner wall of the second filter cover abuts against the second filter.

[0038] Preferably, the opening of the first chamber is sealed with a first swivel joint, and the opening of the second chamber is sealed with a second swivel joint.

[0039] And / or, the first union is collinear with and threaded to the end of the valve head having the first chamber, and the second union is collinear with and threaded to the end of the valve head having the second chamber.

[0040] The two-stage pre-filter provided by the present invention has a valve body assembly as the main pipeline structure of the pre-filter, which is used to install and support the filter assembly and the flow distribution assembly, etc. The valve head and the valve bottle are both hollow structures, and the valve bottle is wrapped around the circumference of the valve head.

[0041] The first filter element and the second filter element in the filter element assembly are both used to filter the liquid flowing into the pre-filter. The first filter element is inserted into the first valve bottle, and the second filter element is inserted into the second valve bottle.

[0042] The flow divider assembly is used to divide the inner cavity of the valve head into two independent first chambers and second chambers. A through hole is provided in the tube wall of the first chamber to allow liquid to flow into the first chamber, and a first through hole is provided at the intersection of the first valve bottle and the tube wall of the first chamber, so that liquid in the first chamber can flow into the inner cavity of the first valve bottle. A through hole is provided in the tube wall of the second chamber to allow liquid to flow out of the second chamber, and a second through hole is provided at the intersection of the second valve bottle and the tube wall of the second chamber.

[0043] The top opening of the first filter element is connected to the inner cavity of the second valve bottle through a pipe or the like, and the top opening of the first filter element and the inner cavity of the second filter element are independent of each other, so that the liquid in the first filter element can only flow into the second valve bottle.

[0044] The second filter element is inserted into the second through hole, and the circumferential surface of the second filter element is sealed with the hole wall of the second through hole, so that the liquid inside the second filter element can only flow into the second chamber.

[0045] In use, the liquid first flows into the first chamber, then through the first through hole into the inner cavity of the first valve bottle. The liquid passes through the side wall of the first filter element and enters the interior of the first filter element, achieving primary filtration. Next, the liquid flowing out of the first filter element flows into the interior of the second valve bottle. The liquid passes through the side wall of the second filter element and enters the interior of the second filter element, achieving secondary filtration. Finally, the liquid flows out through the second through hole and the second chamber in sequence.

[0046] This pre-filter achieves two-stage filtration through two filter elements. The first filter element is inserted into the first valve bottle, and the second filter element is inserted into the second valve bottle. The first and second filter elements are relatively independent, which greatly reduces the possibility of clogging. Attached Figure Description

[0047] 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.

[0048] Figure 1 This is a schematic diagram of the structure of a specific embodiment one provided by the present invention;

[0049] Figure 2 A cross-sectional view of a specific embodiment provided by the present invention;

[0050] Figure 3 This is a schematic diagram of the filtering state in a specific embodiment of the present invention;

[0051] Figure 4 A schematic diagram of the backwashing state in a specific embodiment one provided by the present invention;

[0052] Figure 5 This is a schematic diagram of the structure of a specific embodiment two provided by the present invention;

[0053] Figure 6 A cross-sectional view of a specific embodiment two provided by the present invention;

[0054] Figure 7 for Figure 6 Schematic diagram of the structure at point A;

[0055] Figure 8 This is a schematic diagram of the base structure of the second specific embodiment provided by the present invention;

[0056] Figure 9 This is a schematic diagram of the filtering state in a specific embodiment two provided by the present invention;

[0057] Figure 10 This is a schematic diagram of the backwashing state in a specific embodiment two provided by the present invention;

[0058] Figure 11 Cross-sectional views of the outer structure of the valve head in specific embodiments one and two provided by the present invention;

[0059] Figure 12 Cross-sectional views of the inner structure of the valve head in specific embodiments one and two of the present invention;

[0060] Figure 13 This is a schematic diagram of the inner structure of the valve head in specific embodiments one and two of the present invention;

[0061] Figure 14 Schematic diagrams of the funnels in specific embodiments one and two provided by the present invention;

[0062] Figure 15 Cross-sectional views of the valve bottle in specific embodiments one and two provided by the present invention;

[0063] Figure 16 The diagram shows the structure of the first frame, second frame, and third frame in specific embodiments one and two of the present invention.

[0064] Figure 17 Schematic diagrams of the rubber parts in specific embodiments one and two provided by the present invention;

[0065] Figure 18 Cross-sectional views of the clamping components in specific embodiments one and two of the present invention;

[0066] Figure 19 These are schematic diagrams of the water distribution components in specific embodiments one and two provided by the present invention;

[0067] Figure 20 The diagram shows the structure of the first filter cover, the second filter cover, and the third filter cover in specific embodiments one and two of the present invention.

[0068] Figures 1-20 In the accompanying drawings, the reference numerals include:

[0069] 1 is the valve body assembly, 11 is the valve head, 111 is the first chamber, 112 is the second chamber, 113 is the first through hole, 114 is the second through hole, 115 is the inner structure, 1151 is the main pipe, 1152 is the first branch pipe, 1153 is the second branch pipe, 1154 is the third branch pipe, 116 is the outer structure, 1161 is the sleeve, 1162 is the threaded structure, 117 is the protruding structure, 12 is the first valve bottle, 121 is the third through hole, 13 is the second valve bottle, and 131 is the fourth through hole.

[0070] 2 is the diversion component, 21 is the first adapter, 22 is the second adapter, 23 is the valve ball, 24 is the handle, 25 is the rubber part, 26 is the first water distribution component, 261 is the inclined blade, and 27 is the second water distribution component.

[0071] 3 is the filter element assembly, 31 is the first filter element, 32 is the second filter element, 33 is the first filter screen cover, 34 is the second filter screen cover, 35 is the third filter screen cover, 36 is the base support, 37 is the compression spring, 301 is the first frame, 302 is the first filter screen, 303 is the second frame, 304 is the stacked plate, 305 is the third frame, and 306 is the second filter screen;

[0072] 4 is a sewage discharge component, 41 is a funnel, 42 is a first sealing element, 43 is a first switching element, and 44 is a first cover.

[0073] 5 is the water outlet component, 51 is the connector, 52 is the second sealing component, 53 is the second switching component, and 54 is the second cover.

[0074] 6 is the clamping part, 7 is the first union, 8 is the second union, and 9 is the threaded part. Detailed Implementation

[0075] 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.

[0076] The core of this invention is to provide a two-stage pre-filter that effectively improves the current situation where clogging is prone to occur.

[0077] Please refer to Figures 1 to 20 This invention provides a two-stage pre-filter, comprising a valve body assembly 1, a filter element assembly 3, and a flow divider assembly 2. The valve body assembly 1 includes a valve head 11, a first valve bottle 12, and a second valve bottle 13, both of which are sealed and wrapped around the circumferential surface of the middle portion of the valve head 11. The flow divider assembly 2 is disposed inside the valve head 11, dividing the inner cavity of the valve head 11 into a first chamber 111 and a second chamber 112. The side wall of the first chamber 111 has an opening for liquid to flow into the first chamber 111, and the side wall of the second chamber 112 has an opening for liquid to flow out of the second chamber 112. The first valve bottle 12... A first through hole 113 is provided at the intersection of the tube wall of the first chamber 111 and a second through hole 114 is provided at the intersection of the tube wall of the second valve bottle 13 and the second chamber 112. The filter element assembly 3 includes a first filter element 31 and a second filter element 32. The first filter element 31 is inserted into the interior of the first valve bottle 12, and the top outlet of the first filter element 31 is connected to the inner cavity of the second valve bottle 13 and is independent of the inner cavity of the second filter element 32. The second filter element 32 is sealed and inserted into the interior of the second valve bottle 13 through the second through hole 114.

[0078] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, the valve body assembly 1 is the main pipe 1151 structure of the pre-filter, used to install and support the filter assembly and the diversion assembly 2, etc. The valve head 11 and the valve bottle are both hollow structures, and the valve bottle is wrapped around the circumference of the valve head 11.

[0079] In filter element assembly 3, both the first filter element 31 and the second filter element 32 are used to filter the liquid flowing into the pre-filter, such as... Figure 2 and Figure 6 As shown, the first filter element 31 is inserted into the first valve bottle 12, and the second filter element 32 is inserted into the second valve bottle 13.

[0080] The diversion assembly 2 is used to divide the inner cavity of the valve head 11 into two independent first chambers 111 and second chambers 112. This can be achieved by having a sealing baffle in the middle of the valve head 11, located between the first through hole 113 and the second through hole 114, with the circumferential surface of the baffle fitting against the inner wall of the valve head 11. Furthermore, an annular groove is formed on the circumferential surface of the baffle, and a sealing ring is embedded in this annular groove, thereby dividing the valve head 11 into the first chamber 111 and the second chamber 112. The tube wall of chamber 111 has a through hole to allow liquid to flow into the first chamber 111, and a first through hole 113 is provided at the intersection of the first valve bottle 12 and the tube wall of the first chamber 111, so that the liquid in the first chamber 111 can flow into the inner cavity of the first valve bottle 12; the tube wall of the second chamber 112 has a through hole to allow liquid to flow out of the second chamber 112, and a second through hole 114 is provided at the intersection of the second valve bottle 13 and the tube wall of the second chamber 112.

[0081] The top opening of the first filter element 31 is connected to the inner cavity of the second valve bottle 13 through a pipe or the like, and the top opening of the first filter element 31 and the inner cavity of the second filter element 32 are independent of each other, so that the liquid in the first filter element 31 can only flow into the second valve bottle 13.

[0082] The second filter element 32 is inserted into the second through hole 114, and the circumferential surface of the second filter element 32 is sealed with the hole wall of the second through hole 114. Optionally, the second filter element 32 is fitted with the hole wall of the second through hole 114, or a sealing ring is provided on the outside of the second filter element 32 to effectively prevent the liquid in the second valve bottle 13 from flowing into the gap between the second filter element 32 and the second through hole 114. In this case, the liquid in the second filter element 32 can only flow into the second chamber 112.

[0083] It should be noted that the types of the first through hole 113 and the second through hole 114 are not limited, as long as the above functions can be achieved.

[0084] When using, such as Figure 3 and Figure 9 As shown, the liquid first flows into the first chamber 111, then through the first through hole 113 into the inner cavity of the first valve bottle 12. The liquid passes through the side wall of the first filter element 31 and enters the interior of the first filter element 31, achieving primary filtration. Next, the liquid flowing out of the first filter element 31 flows into the interior of the second valve bottle 13. The liquid passes through the side wall of the second filter element 32 and enters the interior of the second filter element 32, achieving secondary filtration. Finally, the liquid flows out sequentially through the second through hole 114 and the second chamber 112.

[0085] The pre-filter achieves two-stage filtration through two filter elements. The first filter element 31 is inserted into the first valve bottle 12, and the second filter element 32 is inserted into the second valve bottle 13. The first filter element 31 and the second filter element 32 are relatively independent, which greatly reduces the possibility of clogging.

[0086] Based on the above embodiments, the valve head 11 includes an inner layer structure 115 and an outer layer structure 116. The inner layer structure 115 is a four-way pipe, including a main pipe 1151, a first branch pipe 1152, a second branch pipe 1153, and a third branch pipe 1154. The first end of the main pipe 1151 is sealed and inserted into the first end of the outer layer structure 116, and the second end of the main pipe 1151 is sealed and inserted into the second end of the outer layer structure 116. A first chamber 111 is located at the first end of the main pipe 1151, and a second chamber 112 is located at the second end of the main pipe 1151. The main pipe 1151 passes through the inner cavity of the first branch pipe 1152, and... The inner cavities at the first and second ends of the first branch pipe 1152 are independent of each other; the first end of the first branch pipe 1152 is sealed and inserted into the first valve bottle 12, and the second end is sealed and inserted into the second valve bottle 13; the second branch pipe 1153 and the third branch pipe 1154 are both located inside the first branch pipe 1152, the second branch pipe 1153 is connected to the inner cavity at the second end of the first branch pipe 1152, the second branch pipe 1153 is sealed and inserted into the first filter element 31, and the second through hole 114 is the inner cavity of the third branch pipe 1154; the outer layer structure 116 has two hollow threaded structures 1162 in the middle, which are threadedly connected to the first valve bottle 12 and the second valve bottle 13.

[0087] like Figure 2 , Figure 6 and Figure 11 As shown, the outer structure 116 has a sleeve 1161 extending laterally, and two hollow threaded structures 1162 extending from the middle of the sleeve 1161. The inner wall of the threaded structure 1162 has internal threads, and the outer peripheral surfaces of the first valve bottle 12 and the second valve bottle 13 have external threads, thereby realizing the threaded connection between the threaded structure 1162 and the first valve bottle 12 and the second valve bottle 13.

[0088] like Figure 2 , Figure 6 and Figure 12 As shown, the inner structure 115 is a four-way pipe, such as... Figure 2 and Figure 6 As shown, the main pipe 1151 extends in the same direction as the sleeve 1161. The first branch pipe 1152, the second branch pipe 1153, and the third branch pipe 1154 are all pipe joints extending from the middle of the main pipe 1151. The cross-sectional dimension of the upper end of the first branch pipe 1152 is larger than the dimension of the main pipe 1151 through which it passes. The middle part of the first branch pipe 1152 has a barrier structure, which divides the inner cavity at the upper end and the inner cavity at the lower end of the first branch pipe 1152 into two independent parts.

[0089] like Figure 2 , Figure 6 and Figure 12As shown, a first through hole 113 is provided on the lower side of the main pipe 1151, so that the inner cavity of the lower end of the first branch pipe 1152 is connected to the first chamber 111 through the first through hole 113; a second branch pipe 1153 is sleeved inside the lower end of the first branch pipe 1152, the intersection of the second branch pipe 1153 and the main pipe 1151 is closed, and the upper end of the second branch pipe 1153 extends into the inner cavity of the upper end of the first branch pipe 1152, so that the inner cavity of the second branch pipe 1153 is connected to the inner cavity of the upper end of the first branch pipe 1152; a third branch pipe 1154 is sleeved on the upper end of the first branch pipe 1152, and a second through hole 114 is provided at the intersection of the third branch pipe 1154 and the main pipe 1151, so that the inner cavity of the third branch pipe 1154 is connected to the second chamber 112 through the second through hole 114.

[0090] Optional, such as Figure 13 As shown, the second branch pipe 1153 and the third branch pipe 1154 are arranged in the same line. At this time, the outer side of the third branch pipe 1154 is not provided with any through hole to prevent the second branch pipe 1153 and the third branch pipe 1154 from being directly connected. With this arrangement, the pre-filter achieves a miniaturized design. Alternatively, the second branch pipe 1153 and the third branch pipe 1154 can be arranged in a staggered manner.

[0091] After assembly, such as Figure 2 , Figure 6 and Figure 11 As shown, the left end of the main pipe 1151 is inserted into the left end of the sleeve 1161, and the right end of the main pipe 1151 is inserted into the right end of the sleeve 1161. Sealing rings are fitted around both the left and right ends of the main pipe 1151 to achieve a sealed connection and seal the gaps between the two ends of the main pipe 1151 and the sleeve 1161. The upper end of the first branch pipe 1152 is inserted into the upper second valve bottle 13, and the lower end is inserted into the lower first valve bottle 12. Sealing rings are fitted around both the upper and lower circumferences of the first branch pipe 1152. The first branch pipe 1152 is sealed to block the gap between the first valve bottle 12 and the second valve bottle 13. The second branch pipe 1153 is inserted into the first filter element 31, and the circumference of the second branch pipe 1153 is fitted with a sealing ring to seal the gap between the second branch pipe 1153 and the first filter element 31. The third branch pipe 1154 is inserted into the second filter element 32. Similarly, the circumference of the third branch pipe 1154 is fitted with a sealing ring to seal the gap between the third branch pipe 1154 and the second filter element 32.

[0092] When using, such as Figure 3 and Figure 9As shown, the liquid first flows into the first chamber 111, then flows into the inner cavity of the first valve bottle 12 below through the lower end of the first branch pipe 1152. The liquid passes through the side wall of the first filter element 31 and enters the interior of the first filter element 31, achieving primary filtration. Next, the liquid flowing out of the first filter element 31 flows into the interior of the second valve bottle 13 through the second branch pipe 1153. The liquid passes through the side wall of the second filter element 32 and enters the interior of the second filter element 32, achieving secondary filtration. Finally, the liquid flows out through the third branch pipe 1154 and the second chamber 112.

[0093] In some embodiments, the diversion assembly 2 includes a first adapter 21, the bottom end of which is sealed and inserted into a first filter element 31, and the top end of which is sealed and inserted into a second branch pipe 1153, so that the first filter element 31 is located at the center of the first valve bottle 12; in some embodiments, the diversion assembly 2 also includes a second adapter 22, the top end of which is sealed and inserted into a second filter element 32, and the bottom end of which is sealed and inserted into a third branch pipe 1154, so that the second filter element 32 is located at the center of the second valve bottle 13.

[0094] like Figures 2 to 10 As shown, the first through hole 113 is located on the left side, and the second through hole 114 is located on the right side. To position the first filter element 31 at the central axis of the first valve bottle 12, a first adapter 21 with a bent axis connects the inner cavity of the first filter element 31 to the inner cavity of the second valve bottle 13. Specifically, the first adapter 21 is a hollow bent tube structure, as shown... Figure 2 and Figure 6 As shown, the upper end of the first adapter 21 is inserted into and connected to the second branch pipe 1153, and a sealing ring is sandwiched between the first adapter 21 and the peripheral wall of the second branch pipe 1153 to achieve a sealed connection, thereby sealing the gap between the second branch pipe 1153 and the first adapter 21; the lower end of the first adapter 21 is inserted into and connected to the first filter element 31, and another sealing ring is sandwiched between the first adapter 21 and the first filter element 31 to achieve a sealed connection, thereby sealing the gap between the first filter element 31 and the first adapter 21. This arrangement positions the first filter element 31 at the axial position of the first valve bottle 12 via the first adapter 21, facilitating assembly and maintenance, and ensuring the primary filtration and backwashing effect of the pre-filter.

[0095] Similarly, to position the second filter element 32 at the central axis of the second valve bottle 13, a second adapter 22 with a bend in its axis connects the inner cavity of the second filter element 32 to the second chamber 112. Specifically, the second adapter 22 is a hollow bend tube structure, such as... Figure 2 and Figure 6As shown, the lower end of the second adapter 22 is inserted into and connected to the third branch pipe 1154, and a sealing ring is sandwiched between the second adapter 22 and the peripheral wall of the third branch pipe 1154 to achieve a sealed connection, thereby sealing the gap between the third branch pipe 1154 and the second adapter 22; the upper end of the second adapter 22 is inserted into and connected to the second filter element 32, and another sealing ring is sandwiched between the second adapter 22 and the second filter element 32 to achieve a sealed connection, thereby sealing the gap between the second filter element 32 and the second adapter 22. This arrangement positions the second filter element 32 at the axial position of the second valve bottle 13 via the second adapter 22, facilitating assembly and maintenance, and ensuring the primary filtration and backwashing effect of the pre-filter.

[0096] Based on the above embodiment, the first valve bottle 12 is located at the bottom of the valve head 11, and the diversion assembly 2 further includes a valve ball 23 and a handle 24; the valve ball 23 is rotatably embedded in the first chamber 111, and the circumferential surface of the valve ball 23 has three openings, and the interior of the valve ball 23 has a channel connecting each opening; the handle 24 is rotatably disposed on the valve body assembly 1, and the handle 24 is fixedly connected to the valve ball 23, so as to switch the secondary pre-filter to a filtration state, a backwash state, or a closed state; in the filtration state, the liquid flowing into the first chamber 111 can pass through the valve ball 23. The liquid flows through the first through hole 113 into the inner cavity of the first valve bottle 12, and sequentially through the first filter element 31, the inner cavity of the second valve bottle 13, the second filter element 32, the second through hole 114, and the second chamber 112. In the backwashing state, the liquid flowing into the first chamber 111 can flow through the valve ball 23 and the second through hole 114 into the inner cavity of the second filter element 32, and sequentially through the second valve bottle 13, the first filter element 31, the first valve bottle 12, and the drain port at the tail end of the first valve bottle 12. In the closed state, the liquid flowing into the first chamber 111 cannot pass through the valve ball 23.

[0097] Specifically, such as Figure 2 and Figure 6 As shown, a valve ball 23 is fitted into the first chamber 111, wherein the diameter of the valve ball 23 is equal to the diameter of the pipe wall of the first chamber 111, and the valve ball 23 can selectively connect the first chamber 111, the second chamber 112, and the first through hole 113 by rotating. A rotatable handle 24 is provided on the valve body assembly 1, such as... Figure 1 and Figure 5 As shown, one end of the handle 24 is located outside the valve body assembly 1 for the operator to rotate, and the other end of the handle 24 extends into the inner cavity of the valve body assembly 1 and is fixedly connected to the valve ball 23, so that the handle 24 can drive the valve ball 23 to rotate, thereby adjusting the openings of the valve ball 23 to realize the switching of the working state of the pre-filter.

[0098] It is feasible that the end of the first chamber 111, the end of the second chamber 112, the first valve bottle 12, and the second valve bottle 13 are all located on the same side of the valve ball 23, and a set of openings are opened on both sides of the valve ball 23. 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 23 is rotated so that the two sets of openings on the circumference of the valve ball 23 are activated respectively, or the part of the valve ball 23 without openings is opposite to the part of the side wall of the first chamber 111 with through holes, so that it can switch between the filtration state, the backwash state, and the closed state.

[0099] To control the outflow or stopflow of liquid from the first valve bottle 12, the following can be achieved: Figure 1 and Figure 2 As shown, a through hole is provided at the bottom end of the first valve bottle 12 located below as a drain outlet, and a plug is provided in the drain outlet, so as to control the liquid to flow out from the bottom end of the first valve bottle 12 or stop the flow.

[0100] In use, the pre-filter is adjusted to the filtration state by rotating the valve ball 23 with the handle 24. After the liquid flows into the first chamber 111, it passes through the opening of the valve ball 23 and its internal channel to connect with the first through hole 113, allowing the liquid to flow into the first valve bottle 12. Then, the liquid flows into the interior of the first filter element 31 to achieve primary filtration. Further, the liquid flows from the first filter element 31 into the second valve bottle 13, and then into the interior of the second filter element 32 to achieve secondary filtration. Finally, it flows out through the second through hole 114 and the second chamber 112. The pre-filter is adjusted to the backwash state by rotating the valve ball 23 with the handle 24. After the liquid flows into the first chamber 111, it flows into the second chamber 112 through the opening of the valve ball 23 and its internal channel. Then, the liquid flows into the second filter element 32 through the second through hole 114. The liquid passes through the side wall of the second filter element 32 into the second valve bottle 13 and then into the interior of the first filter element 31. It then passes through the side wall of the first filter element 31 into the first valve bottle 12, and finally flows out from the drain port at the bottom of the first valve bottle 12.

[0101] In this embodiment, the pre-filter can switch between filtration and backwashing states, so that 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.

[0102] Based on the above embodiment, a drain assembly 4 is inserted into the tail end of the inner cavity of the first valve bottle 12; the drain assembly 4 includes a funnel 41 and a hollow first sealing member 42, the bottom opening of the funnel 41 is connected to the through hole in the middle of the first sealing member 42; the tail end of the first valve bottle 12 has a third through hole 121, the bottom end of the first sealing member 42 is sealed and inserted into the third through hole 121, and a first switch member 43 for opening or closing the through hole in the middle of the first sealing member 42 is provided in the through hole in the middle of the first sealing member 42.

[0103] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, the first valve bottle 12 is located below the valve head 11, and a drain assembly 4 is provided at the lower end of the first valve bottle 12 for draining impurities from the first valve bottle 12, the first filter element 31, and the second valve bottle 13. The bottom end of the first filter element 31 is closed, so when the liquid in the first filter element 31 flows outward, it must pass through its own side wall used for filtering the liquid, so as to rinse the filtration structure on the side wall of the first filter element 31. The funnel 41 is fitted inside the first valve bottle 12, so that the impurities in the first valve bottle 12 can flow into the funnel 41. A sealing ring is fitted around the funnel 41 to seal the gap between the funnel 41 and the first valve bottle 12.

[0104] Preferred, such as Figure 16 As shown, the lower end of the first filter element 31 extends into the inner cavity of the funnel 41, and the bottom of the first 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.

[0105] The first sealing element 42 has a cylindrical structure, such as Figure 2 , Figure 6 and Figure 7 As shown, the lower end of the funnel 41 is inserted into the upper end of the first seal 42, and the two can be connected by an interference fit, or, as... 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 funnel 41 body, such as... Figure 2 , Figure 6 and Figure 7 As shown, the upper end of the first sealing member 42 has an octagonal cross-section and is inserted into the aforementioned gap; thus, the liquid flowing out of the lower end opening of the funnel 41 can flow into the through hole in the middle of the first sealing member 42.

[0106] like Figure 15 As shown, the lower end face of the first valve bottle 12 has a third through hole 121 along the longitudinal direction. After assembly, as shown... Figure 2 , Figure 6 and Figure 7 As shown, the first sealing member 42 is inserted into the third through hole 121, and the circumferential surface of the first sealing member 42 is fitted onto the sealing ring to seal the gap between the first sealing member 42 and the third through hole 121; furthermore, the first switch member 43 is inserted into the through hole in the middle of the first sealing member 42, and the first switch member 43 can be a plug or a valve, etc.

[0107] When using, adjust the pre-filter to backwash mode, such as... Figure 4 and Figure 10 As shown, when the first switch 43 at the lower end of the first valve bottle 12 is opened, the liquid in the second filter element 32 passes through its side wall and enters the second valve bottle 13. The liquid in the second valve bottle 13 flows into the first filter element 31 through the second through hole 114. The liquid in the first filter element 31 flows into the inner cavity of the first valve bottle 12 through its own side wall, and then flows downward into the inner cavity of the funnel 41. The impurities and liquid in the funnel 41 continue to flow downward into the through hole in the middle of the first seal 42. Finally, the liquid flows out from the first switch 43 opened below the first valve bottle 12 or flows out directly from the through hole in the middle of the first seal 42. Adjust the pre-filter to the filtering state and close the first switch 43 below the first valve bottle 12.

[0108] Optional, such as Figure 2 , Figure 6 and Figure 7 As shown, a hollow first cover 44 is fitted on the outer side of the lower end of the first valve bottle 12. The first cover 44 is threadedly connected to the first sealing element 42. This arrangement helps to improve the stability and high pressure resistance of the first filter element 31 and the sewage discharge assembly 4.

[0109] In some embodiments, the second valve bottle 13 is located at the top of the valve head 11, and the tail end of the second valve bottle 13 is provided with a water outlet assembly 5. The water outlet assembly 5 includes a hollow connector 51 and a hollow second seal 52. The bottom end of the connector 51 is sealed and inserted into the second filter element 32, and the top end of the connector 51 is sealed and inserted into the bottom end of the second seal 52. The tail end of the second valve bottle 13 has a fourth through hole 131. The top end of the second seal 52 is sealed and inserted into the fourth through hole 131, and a second switch 53 for opening or closing the through hole in the middle of the second seal 52 is provided in the middle through hole of the second seal 52.

[0110] like Figure 1 and Figure 2 As shown, the second valve bottle 13 is located above the valve head 11, and a water outlet assembly 5 is provided at the upper end of the second valve bottle 13 for discharging the liquid in the second filter element 32. The upper end of the second filter element 32 is inserted into the lower end of the connector 51, and the tail end of the second filter element 32 extends into the connector 51 to connect the inner cavity of the second filter element 32 with the inner cavity of the connector 51. A sealing ring is provided on the circumferential surface of the upper end of the second filter element 32 or the circumferential surface of the connector 51 to seal the gap between the second filter element 32 and the connector 51, so that the liquid in the second filter element 32 can only flow into the inner cavity of the connection. The upper end of the connector 51 is inserted into the lower end of the second sealing element 52, and a sealing ring is provided on the circumferential surface of the connector 51 to seal the gap between the connector 51 and the second sealing element 52.

[0111] like Figure 15 As shown, the upper end of the inverted second valve bottle 13 has a fourth through hole 131. After assembly, as shown... Figure 2 As shown, the upper end of the second sealing member 52 is inserted into the fourth through hole 131, and the circumferential surface of the second sealing member 52 is fitted onto the sealing ring to seal the gap between the second sealing member 52 and the fourth through hole 131; furthermore, the second switch member 53 is inserted into the through hole in the middle of the second sealing member 52, and the second switch member 53 can be a plug or a valve, etc.

[0112] When using it, adjust the pre-filter to the filtering state, such as... Figure 3 As shown, when the second switch 53 at the upper end of the second valve bottle 13 is opened, some of the liquid in the second filter element 32 flows upward, and then flows into the through hole in the middle of the second seal 52 through the inner cavity of the connector 51. Finally, the liquid flows out from the second switch 53 opened above the second valve bottle 13 or flows out directly from the through hole in the middle of the second seal 52.

[0113] It should be noted that the second switch 53 at the tail end of the first valve bottle 12 and the second switch 53 at the tail end of the second valve bottle 13 can be the same or different, as long as the above functions can be achieved.

[0114] In some embodiments, the second valve bottle 13 is located on top of the valve head 11, and the peripheral wall of the second valve bottle 13 is a closed structure, specifically, as shown in... Figure 5 and Figure 6 As shown, the side wall of the upper second valve bottle 13 does not have a through hole, so the liquid in the second filter bottle 13 can only flow to the interior of the first filter element 31 through the second through hole 114. With this setting, the pressure resistance of the pre-filter is high, whether in the filtration state or the backwashing state.

[0115] Optional, such as Figure 2 and Figure 6 As shown, a hollow second cover 54 is fitted on the outer side of the upper end of the second valve bottle 13. The second cover 54 is threadedly connected to the second sealing element 52. This arrangement helps to improve the stability and high pressure resistance of the second filter element 32 and the water outlet assembly 5.

[0116] Based on the above embodiment, the valve ball 23 is disposed in the first chamber 111 through the rubber part 25. The valve ball 23 is rotatably fitted into the inner cavity of the rubber part 25 to reduce the wear between the valve ball 23 and the valve head 11 and to seal the gap between the valve ball 23 and the valve head 11.

[0117] Specifically, the rubber component 25 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 25 are in contact with the inner wall surface of the valve head 11, ensuring that all liquid flowing into the first chamber 111 flows into the rubber component 25, and all liquid flowing out of the rubber component 25 flows according to a preset flow path; such as Figure 17 As shown, the rubber part 25 has openings at its left end, right end, and middle sidewall. After assembly, as... Figure 2 and Figure 6 As shown, the left end opening of the rubber component 25 connects to the first chamber 111, the right end opening connects to the second chamber 112, and the middle opening connects to the first through hole 113. The peripheral wall of the valve ball 23 is tightly fitted to the inner wall of the rubber component 25, thereby preventing liquid from flowing through the gap between the valve ball 23 and the rubber component 25.

[0118] In use, the liquid flowing into the first chamber 111 first flows into the inner cavity of the rubber component 25, and then flows through the opening of the valve ball 23 and the rubber component 25 to the first valve bottle 12 or the second chamber 112 to meet the requirements of filtration and backwashing. In this embodiment, the gap between the valve ball 23 and the valve head 11 is sealed by the rubber component 25 to ensure the function of the valve ball 23 and to reduce wear between the valve ball 23 and the valve head 11, thereby effectively extending the service life of the pre-filter.

[0119] In some embodiments, the valve head 11 has a protrusion structure 117 between the first chamber 111 and the second chamber 112, the first end of the rubber member 25 abuts against the protrusion structure 117, and a clamping member 6 is threadedly connected in the first chamber 111, the clamping member 6 abuts against the second end of the rubber member 25.

[0120] like Figure 2 and Figure 6 As shown, the two ends of the rubber part 25 abut against the protruding structure 117 and the clamping member 6 inside the valve head 11, respectively, thereby effectively preventing misalignment between the rubber part 25 and the valve ball 23, ensuring the function of the pre-filter. Preferably, as shown... Figure 18 As shown, the central through hole of the clamping member 6 is a countersunk hole, and the end of the countersunk hole with a larger cross-sectional size is close to the rubber member 25, so that the end of the rubber member 25 is inserted into the countersunk hole and abuts against the clamping member 6, so as to effectively ensure the conduction between the rubber member 25 and the clamping member 6, and facilitate the installation of the clamping member 6 and the rubber member 25 into place.

[0121] Furthermore, such as Figure 18 As shown, the end of the clamping member 6 furthest from the rubber member 25 has a limiting structure, such as... Figure 2 and Figure 6 As shown, after the clamping member 6 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 6 from being screwed in too much, so as to prevent the valve ball 23 from being over-compressed and unable to rotate.

[0122] It should be noted that, as Figure 2 and Figure 6 As shown, the clamping member 6 has a groove on its circumference for setting a sealing ring to seal the gap between the clamping member 6 and the valve head 11.

[0123] Based on the above embodiment, the first filter element 31 is provided with a first water distribution component 26 on its circumferential surface. The first water distribution component 26 is sealed and inserted into the first valve bottle 12, and the first water distribution component 26 is located at the end of the first valve bottle 12 near the valve head 11. The end of the first water distribution component 26 away from the valve head 11 has an inclined blade 261 to guide the liquid to flow in a swirling direction.

[0124] Specifically, such as Figure 19 As shown, the first water distribution component 26 has a cylindrical structure, such as... Figure 2 and Figure 6 As shown, the first filter element 31 passes through the through hole in the middle of the first water distribution component 26. Optionally, the first water distribution component 26 is interference-fitted into the inside of the first valve bottle 12, or, as... Figure 19 As shown, the upper end of the circumferential surface of the first water distribution component 26 has a protrusion, such as... Figure 15 As shown, a groove is provided at the upper end of the inner cavity of the first valve bottle 12. The groove and the protrusion cooperate with each other and are pressed by the valve head 11 to define the position of the first water distribution component 26. Furthermore, an annular groove is provided in the middle or lower end of the circumference of the first water distribution component 26, and a sealing ring is provided in the annular groove, such as... Figure 2 and Figure 6 As shown, this is to seal the gap between the first valve bottle 12 and the first water distribution component 26.

[0125] like Figure 19 As shown, the lower end face of the first water distribution component 26 has several through holes around itself, so that the liquid can flow into the first valve bottle 12 after passing through. At the end of each through hole, there is an inclined blade 261, and each inclined blade 261 faces the same direction, so that the liquid flowing through the first water distribution component 26 flows in a swirling direction. This arrangement is beneficial to promote the filtration of the liquid through the first filter element 31 after entering the first valve bottle 12.

[0126] In some embodiments, a second water distribution element 27 is sleeved on the circumferential surface of the second filter element 32. The second water distribution element 27 is sealed and inserted into the second valve bottle 13, and the second water distribution element 27 is located at the end of the second valve bottle 13 near the valve head 11. The end of the second water distribution element 27 away from the valve head 11 has an inclined blade 261 to guide the liquid to flow in a swirling direction.

[0127] Similarly, such as Figure 19 As shown, the second water distribution component 27 has a cylindrical structure, such as... Figure 2 and Figure 6 As shown, the second filter element 32 passes through the through hole in the middle of the second water distribution component 27. Optionally, the second water distribution component 27 is interference-fitted into the interior of the second valve bottle 13, or, as... Figure 19 As shown, there is a protrusion at the upper end of the circumferential surface of the inverted second water distribution component 27, such as... Figure 15As shown, a groove is provided at the upper end of the inner cavity of the inverted second valve bottle 13. The groove and the protrusion cooperate with each other and are pressed by the valve head 11 to define the position of the second water distributor 27. Furthermore, an annular groove is provided in the middle or lower end of the circumference of the inverted second water distributor 27, and a sealing ring is provided in the annular groove. Figure 2 and Figure 6 As shown, this is to seal the gap between the second valve bottle 13 and the second water distribution component 27.

[0128] like Figure 19 As shown, the inverted second water distributor 27 has several through holes around its lower end face, allowing liquid to pass through and flow into the second valve bottle 13. Each through hole has an inclined blade 261 at its end, and each inclined blade 261 faces the same direction, so that the liquid flowing through the second water distributor 27 flows in a swirling direction. This arrangement helps to facilitate the filtration of the liquid through the second filter element 32 after it enters the second valve bottle 13.

[0129] Based on the above embodiments, both the first filter element 31 and the second filter element 32 include a first frame 301 and a first filter screen 302. The first frame 301 has a cylindrical structure, and the first filter screen 302 is sleeved on the outside of the corresponding first frame 301.

[0130] Specifically, such as Figure 16 As shown, the first frame 301 has a cylindrical structure, and a first filter screen 302 is fitted on the circumferential surface of the first frame 301. The first filter screen 302 can be fixed by a clamp or pressed by a first filter screen cover 33. Several through holes are opened on the circumferential wall of the first frame 301 covered by the first filter screen 302, so that liquid can pass through the first filter screen 302 and the first frame 301. In this embodiment, the first filter screen 302 is not easily deformed by the support of the first frame 301, so as to ensure the filtration function of the first filter element 31 and the second filter element 32.

[0131] When necessary, such as Figure 2 As shown, annular grooves are provided on the upper and lower circumferential surfaces of the first frame 301 to provide sealing rings, thereby sealing the gaps between the upper end of the first filter screen 302 and the upper end of the first frame 301, and between the lower end of the first filter screen 302 and the lower end of the first frame 301.

[0132] In some embodiments, the first filter element 31 and the second filter element 32 both include a first filter cover 33, each first frame 301 is inserted into the central through hole of the corresponding first filter cover 33, and the inner wall of each first filter cover 33 abuts against the corresponding first filter 302.

[0133] like Figure 20As shown, the first filter cover 33 has a hollow structure. The lower end of the first frame 301 passes through the through hole at the center of the first filter cover 33, which can be achieved. The inner wall of the first filter cover 33 has a protrusion, and a groove is formed on the circumferential surface of the first frame 301. The first filter cover 33 and the first frame 301 are fixedly connected by the cooperation of the protrusion and the groove, or the first frame 301 and the first filter cover 33 are interference-fitted, etc. Figure 2 As shown, the lower inner wall of the first filter cover 33, which cooperates with the first frame 301 in the second filter element 32, contacts the upper circumferential surface of the first filter 302 in the second filter element 32, and the upper inner wall of the first filter 33, which cooperates with the first frame 301 in the first filter element 31, contacts the lower circumferential surface of the first filter 302 in the first filter element 31. Thus, the first filter cover 33 can press down the upper end of the first filter 302 in the second filter element 32 and the lower end of the first filter 302 in the first filter element 31 to prevent the first filter 302 from shifting or falling off.

[0134] Based on the above embodiments, the first filter element 31 includes a second frame 303 and a plurality of stacked pieces 304. The second frame 303 is provided with stacked pieces 304, a base support 36, a compression spring 37 and a third filter cover 35 sequentially from top to bottom on its circumferential surface. One end of the compression spring 37 abuts against the third filter cover 35 and the other end abuts against the base support 36. The second filter element 32 includes a third frame 305 and a second filter 306. The third frame 305 has a cylindrical structure and the second filter 306 is sleeved on the outside of the third frame 305.

[0135] like Figure 6 As shown, the first filter element 31 contains a cylindrical second frame 303 inside, and the stacked plates 304 have an annular structure. Each stacked plate 304 is stacked and fitted on the outside of the second frame 303, with gaps between each stacked plate to allow liquid to flow through. Several through holes are provided on the peripheral wall of the second frame 303 covered by each stacked plate 304, so that liquid can pass through the second frame 303 and each stacked plate 304, and the second frame 303 supports each stacked plate 304.

[0136] like Figure 7 and Figure 8 As shown, the lower circumferential surface of the second frame 303 is also fitted with an annular base 36, a compression spring 37, and a third filter cover 35. The stacked pieces 304, the base 36, the compression spring 37, and the third filter cover 35 are arranged sequentially from top to bottom. The base 36 is in direct contact with the bottommost stacked piece 304, thereby protecting each stacked piece 304. The compression spring 37 is sandwiched between the base 36 and the third filter cover 35, and the third filter cover 35 is relatively fixed to the second frame 303, that is, the third filter cover 35 will not move arbitrarily when subjected to external force, so as to stably support the compression spring 37.

[0137] When using, adjust the pre-filter to backwash mode, such as... Figure 10 As shown, the liquid in the upper second valve bottle 13 flows into the first filter element 31 through the second through hole 114. Then, when the liquid in the first filter element 31 flows out through its side wall, the compression spring 37 is compressed and contracts, and the gap between each stack of plates 304 becomes larger, which helps to improve the sewage discharge function of the pre-filter.

[0138] In some embodiments, a second filter cover 34 is fitted onto the tail end of the second filter element 32, and the inner wall of the bottom end of the second filter cover 34 abuts against the second filter 306. Similarly, as Figure 6 As shown, in this embodiment, the lower inner wall of the second filter cover 34 contacts the circumferential surface of the upper end of the second filter 306, so that the upper end of the second filter 306 can be pressed by the second filter cover 34 to prevent it from shifting or falling off.

[0139] It should be noted that the first frame 301, the second frame 303, and the third frame 305 can be the same or different, as long as they meet the above functions; similarly, the first filter cover 33, the second filter cover 34, and the third filter cover 35 can be the same or different, as long as they meet the above functions.

[0140] Preferably, the first filter screen 302 and the second filter screen 306 are made of 361 stainless steel to ensure the filtration effect and effectively extend the service life of the pre-filter.

[0141] In some embodiments, the opening of the first chamber 111 is sealed with a first union 7; in some embodiments, the opening of the second chamber 112 is sealed with a second union 8.

[0142] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, a first union 7 is provided at the end of the pipe wall of the first chamber 111, which can be welded together. Similarly, a second union 8 is provided at the end of the pipe wall of the second chamber 112. With this arrangement, the pre-filter can be easily connected to the end of the water pipe through the first union 7 and the second union 8.

[0143] In some embodiments, the first union 7 is collinear with the end of the valve head 11 having a first chamber 111 and is threadedly connected; in some embodiments, the second union 8 is collinear with the end of the valve head 11 having a second chamber 112 and is threadedly connected.

[0144] Optional, such as Figure 2 and Figure 6As shown, the circumferential surface of the first union 7 and the end circumferential surface of the first chamber 111 pipe wall both have external threads, which are connected to the first union 7 and the end thread of the first chamber 111 pipe wall through the internal thread in the through hole in the middle of the threaded part 9; similarly, as Figure 2 and Figure 6 As shown, the circumferential surface of the second union 8 and the end circumferential surface of the second chamber 112 pipe wall both have external threads, which are connected to the second union 8 and the end thread of the second chamber 112 pipe wall through the internal thread in the through hole in the middle of the threaded part 9.

[0145] Furthermore, such as Figure 2 and Figure 6 As shown, a gasket is sandwiched between the opposite ends of the second union 8 and the valve head 11, and between the opposite ends of the second union 8 and the valve head 11, to prevent liquid from leaking out from the connection position.

[0146] Optionally, the first union 7 has an external thread on its circumferential surface and an internal thread at the end of the first chamber 111 pipe wall, so that the first union 7 can be screwed into the first chamber 111 of the valve head 11; similarly, the second union 8 has an external thread on its circumferential surface and an internal thread at the end of the second chamber 112 pipe wall, so that the second union 8 can be screwed into the second chamber 112 of the valve head 11.

[0147] In some embodiments, a pressure gauge is provided on the side wall of the second chamber 112, and the test contact of the pressure gauge is located in the second chamber 112. When 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.

[0148] 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.

[0149] In some embodiments, the interior of the first filter element 31 and the second filter element 32 is filled with scale-inhibiting filter media. During filtration, liquid flows into the inner cavity of the first filter element 31 and the second filter element 32 in sequence, and the liquid first flows through the scale-inhibiting filter media in the inner cavity of the first filter element 31 and the second filter element 32. This arrangement effectively prevents the generation of a large amount of scale in the pipeline connected to the opening end of the second chamber 112 of the filter, so as to ensure the purity of the water used.

[0150] 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.

[0151] Optionally, the scale-inhibiting filter media is filled inside the first filter element 31 and the second filter element 32 by means of a cloth tape. Alternatively, the scale-inhibiting filter media is filled inside the first filter element 31 and the second filter element 32 by means of a bag-shaped filter screen. This arrangement facilitates the assembly, maintenance and replacement of the filter media.

[0152] 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.

[0153] 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.

[0154] The foregoing has provided a detailed description of the two-stage pre-filter provided by this invention. 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 two-stage pre-filter, characterized in that, include: The valve body assembly (1) includes a valve head (11), a first valve bottle (12) and a second valve bottle (13), wherein the first valve bottle (12) and the second valve bottle (13) are both sealed around the circumferential surface of the middle part of the valve head (11); The diversion assembly (2) is disposed inside the valve head (11) and is used to divide the inner cavity of the valve head (11) into a first chamber (111) and a second chamber (112). The side wall of the first chamber (111) has an opening for liquid to flow into the first chamber (111), and the side wall of the second chamber (112) has an opening for liquid to flow out of the second chamber (112). A first through hole (113) is provided at the intersection of the first valve bottle (12) and the pipe wall of the first chamber (111), and a second through hole (114) is provided at the intersection of the second valve bottle (13) and the pipe wall of the second chamber (112). The filter element assembly (3) includes a first filter element (31) and a second filter element (32). The first filter element (31) is inserted into the interior of the first valve bottle (12), and the top outlet of the first filter element (31) is connected to the inner cavity of the second valve bottle (13) and independent of the inner cavity of the second filter element (32). The second filter element (32) is sealed and inserted into the interior of the second valve bottle (13) through the second through hole (114).

2. The secondary pre-filter according to claim 1, characterized in that, The valve head (11) includes an inner layer structure (115) and an outer layer structure (116). The inner layer structure (115) is a four-way pipe, including a main pipe (1151), a first branch pipe (1152), a second branch pipe (1153) and a third branch pipe (1154). The first end of the main pipe (1151) is sealed and inserted into the first end of the outer structure (116), and the second end of the main pipe (1151) is sealed and inserted into the second end of the outer structure (116). The first chamber (111) is located at the first end of the main pipe (1151), and the second chamber (112) is located at the second end of the main pipe (1151). The main pipe (1151) passes through the inner cavity of the first branch pipe (1152), and the inner cavities of the first end and the second end of the first branch pipe (1152) are independent of each other. The first end of the first branch pipe (1152) is sealed and inserted into the first valve bottle (12), and the second end is sealed and inserted into the second valve bottle (13). The second branch pipe (1153) and the third branch pipe (1154) are both located inside the first branch pipe (1152). The second branch pipe (1153) is connected to the inner cavity of the second end of the first branch pipe (1152). The second branch pipe (1153) is sealed and inserted into the first filter element (31). The second through hole (114) is the inner cavity of the third branch pipe (1154). The outer structure (116) has two hollow threaded structures (1162) in the middle, which are threaded to connect the first valve bottle (12) and the second valve bottle (13).

3. The secondary pre-filter according to claim 2, characterized in that, The shunt assembly (2) includes a first adapter (21) and a second adapter (22); The bottom end of the first adapter (21) is sealed and inserted into the first filter element (31), and the top end is sealed and inserted into the second branch pipe (1153), so that the first filter element (31) is located at the center of the first valve bottle (12); The second adapter (22) is sealed at the top end to the second filter element (32) and sealed at the bottom end to the third branch pipe (1154) so ​​that the second filter element (32) is located at the center of the second valve bottle (13).

4. The secondary pre-filter according to claim 1, characterized in that, The first valve bottle (12) is located at the bottom of the valve head (11), and the diversion assembly (2) also includes a valve ball (23) and a handle (24). The valve ball (23) is rotatably embedded in the first chamber (111), and the valve ball (23) has three openings on its circumference, and the interior of the valve ball (23) has a channel connecting each of the openings; The handle (24) is rotatably mounted on the valve body assembly (1), and the handle (24) is fixedly connected to the valve ball (23) to switch the secondary pre-filter to a filtering state, a backwashing state, or a closed state. The filtration state is that the liquid flowing into the first chamber (111) flows through the valve ball (23) and the first through hole (113) to the inner cavity of the first valve bottle (12), and passes through the first filter element (31), the inner cavity of the second valve bottle (13), the second filter element (32), the second through hole (114), and the second chamber (112) in sequence. The backwashing state is that the liquid flowing into the first chamber (111) flows through the valve ball (23) and the second through hole (114) to the inner cavity of the second filter element (32), and then passes through the second valve bottle (13), the first filter element (31), the first valve bottle (12), and the drain port at the tail end of the first valve bottle (12) in sequence. The closed state means that the liquid flowing into the first chamber (111) cannot pass through the valve ball (23).

5. The secondary pre-filter according to claim 4, characterized in that, A sewage discharge assembly (4) is inserted into the tail end of the inner cavity of the first valve bottle (12). The sewage discharge assembly (4) includes a funnel (41) and a hollow first sealing element (42), the bottom opening of the funnel (41) communicating with the through hole in the middle of the first sealing element (42); The tail end of the first valve bottle (12) has a third through hole (121), the bottom end of the first sealing member (42) is sealed and inserted into the third through hole (121), and a first switch member (43) for opening or closing the through hole in the middle of the first sealing member (42) is provided in the through hole.

6. The secondary pre-filter according to claim 5, characterized in that, The second valve bottle (13) is located at the top of the valve head (11), and the tail end of the second valve bottle (13) is provided with a water outlet assembly (5). The water outlet assembly (5) includes a hollow connector (51) and a hollow second seal (52). The bottom end of the connector (51) is sealed and inserted into the second filter element (32), and the top end of the connector (51) is sealed and inserted into the bottom end of the second seal (52). The tail end of the second valve bottle (13) has a fourth through hole (131). The top end of the second seal (52) is sealed and inserted into the fourth through hole (131), and the middle through hole of the second seal (52) is provided with a second switch (53) for opening or closing the middle through hole of the second seal (52). Alternatively, the second valve bottle (13) is located on top of the valve head (11), and the peripheral wall of the second valve bottle (13) is a closed structure.

7. The secondary pre-filter according to claim 4, characterized in that, The valve ball (23) is disposed in the first chamber (111) through the rubber part (25). The valve ball (23) rotates and fits into the inner cavity of the rubber part (25) to reduce the wear between the valve ball (23) and the valve head (11) and seal the gap between the valve ball (23) and the valve head (11). And / or, the valve head (11) has a protrusion structure (117) between the first chamber (111) and the second chamber (112), the first end of the rubber part (25) abuts against the protrusion structure (117), and a clamping member (6) is threadedly connected in the first chamber (111), the clamping member (6) abuts against the second end of the rubber part (25).

8. The secondary pre-filter according to any one of claims 1 to 7, characterized in that, The first filter element (31) is fitted with a first water distribution element (26) on its circumferential surface. The first water distribution element (26) is sealed and inserted into the first valve bottle (12). The first water distribution element (26) is located at the end of the first valve bottle (12) near the valve head (11). The end of the first water distribution element (26) away from the valve head (11) has an oblique blade (261) to guide the liquid to flow in a swirling direction. And / or, the second filter element (32) is provided with a second water distribution element (27) on its circumferential surface, the second water distribution element (27) is sealed and inserted into the second valve bottle (13), and the second water distribution element (27) is located at the end of the second valve bottle (13) near the valve head (11), and the end of the second water distribution element (27) away from the valve head (11) has the oblique blade (261) to guide the liquid to flow in a swirling direction.

9. The secondary pre-filter according to any one of claims 1 to 7, characterized in that, The first filter element (31) and the second filter element (32) both include a first frame (301) and a first filter screen (302). The first frame (301) is a cylindrical structure, and the first filter screen (302) is sleeved on the outside of the corresponding first frame (301). The first filter element (31) and the second filter element (32) both include a first filter cover (33), each of the first frames (301) is inserted into the middle through hole of the corresponding first filter cover (33), and the inner wall of each first filter cover (33) abuts against the corresponding first filter (302).

10. The secondary pre-filter according to any one of claims 1 to 7, characterized in that, The first filter element (31) includes a second frame (303) and a plurality of stacked pieces (304). The second frame (303) is provided with stacked pieces (304), a base support (36), a compression spring (37) and a third filter cover (35) sequentially from top to bottom on its circumferential surface. One end of the compression spring (37) abuts against the third filter cover (35) and the other end abuts against the base support (36). The second filter element (32) includes a third frame (305) and a second filter (306). The third frame (305) is a cylindrical structure and the second filter (306) is sleeved on the outside of the third frame (305). The tail end of the third frame (305) is fitted with a second filter cover (34), and the bottom inner wall of the second filter cover (34) abuts against the second filter (306).

11. The secondary pre-filter according to any one of claims 1 to 7, characterized in that, The opening of the first chamber (111) is sealed with a first union (7), and the opening of the second chamber (112) is sealed with a second union (8). The first union (7) is collinear with the end of the valve head (11) having the first chamber (111) and is threadedly connected, and the second union (8) is collinear with the end of the valve head (11) having the second chamber (112) and is threadedly connected.

Images