Pre-filter sewage structure and pre-filter

Abstract

This utility model relates to the field of water purification equipment technology, and discloses a pre-filter drainage structure and a pre-filter. The pre-filter drainage structure includes a filter cylinder and a support frame. The support frame includes an inner ring and an outer ring connected to the outer periphery of the inner ring. The inner ring is hollow and includes a first part sealed inside the bottom of the filter cylinder and a second part located outside the filter cylinder. A first drainage hole is opened on the side wall of the first part, a third drainage hole is opened on the side wall of the second part, and a second drainage hole is opened on the outer ring. In the drainage state, the inner cavity of the filter cylinder is connected to the inner cavity of the inner ring through the first drainage hole, and the outer space of the filter cylinder is connected to the inner cavity of the inner ring through the second and third drainage holes. The drainage structure of the pre-filter provided by this utility model can simultaneously drain the sewage from both the inner and outer sides of the filter cylinder through two sets of drainage channels, and ensures the rapid discharge of sewage from both sides of the filter cylinder during washing.

Description

Technical Field

[0001] This utility model relates to the field of water purification equipment technology, and in particular to a pre-filter discharge structure and a pre-filter. Background Technology

[0002] A pre-filter is the first coarse filtration device for household water supply. It is usually installed after the water meter and can filter out large particulate impurities such as mud, algae, and colloids in tap water. This prevents the large amount of sediment and impurities generated in urban and residential water supply networks from causing harm to the human body, and also provides pre-protection for downstream equipment such as underfloor heating pipes, household faucets, and electrical appliances.

[0003] After prolonged use, dirt accumulates on the surface of the filter cartridge, making it difficult to clean. This accumulated impurities gradually clog the filter cartridge, reducing the water flow rate, causing a pressure drop, and affecting the lifespan of the pre-filter. Therefore, it is necessary to regularly brush the surface of the filter cartridge to clean it, and then discharge the wastewater and impurities through the drain structure. In existing technology, pre-filters on the market discharge wastewater and impurities through a single channel to the drain outlet. After wastewater and impurities are discharged from one side of the filter cartridge, the wastewater and impurities on the other side must pass through the filter cartridge again to be discharged. At this point, impurities are easily blocked on the other side of the filter cartridge, resulting in incomplete discharge and a slow discharge speed.

[0004] Therefore, there is an urgent need to provide a pre-filter discharge structure and a pre-filter to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a pre-filter drainage structure and a pre-filter that can simultaneously drain sewage from both the inner and outer sides of the filter cartridge through two sets of drainage channels, and ensure the rapid discharge of sewage from both sides of the filter cartridge during washing.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0007] The pre-filter's drainage structure includes a filter cartridge and a support frame. The support frame includes an inner ring portion and an outer ring portion connected to the outer periphery of the inner ring portion. The inner ring portion is hollow and includes a first part that is sealed and passes through the bottom of the filter cartridge and a second part located outside the filter cartridge. A first drainage hole is opened on the side wall of the first part, a third drainage hole is opened on the side wall of the second part, and a second drainage hole is opened on the outer ring portion. In the drainage state, the inner cavity of the filter cartridge is connected to the inner cavity of the inner ring portion through the first drainage hole, and the outer space of the filter cartridge is connected to the inner cavity of the inner ring portion through the second drainage hole and the third drainage hole.

[0008] As an optional solution, the bottom of the filter cartridge is provided with a sealing protrusion ring and a drain hole communicating with the inner cavity of the filter cartridge, and the support frame can move axially relative to the filter cartridge between the filtration position and the drain position;

[0009] When the support frame is in the drain position, the first drain hole coincides with and connects with the drain hole, and the second drain hole is open; when the support frame is in the filter position, the first drain hole is offset from and closed with the drain hole, and the sealing ring blocks the second drain hole.

[0010] As an alternative, the drain hole is arranged to gradually slope downwards from the outside to the inside along the radial direction of the filter cylinder.

[0011] As an alternative, the inner ring portion is sealed to the filter cartridge by a fourth sealing ring, and the outer ring portion is sealed to the sealing convex ring by a sixth sealing ring.

[0012] As an optional solution, the number of the fourth sealing rings is set to two, with the two fourth sealing rings located on the upper and lower sides of the first drain hole, respectively.

[0013] As an optional solution, the filter cartridge includes a filter screen and a support. The filter screen is a cylindrical structure with openings at both ends. The support includes an outer ring frame and an inner ring frame. The outer ring frame is fitted and sleeved on the outside of the filter screen. The inner ring frame is connected to the inner bottom of the outer ring frame. The inner ring portion is sealed and inserted inside the inner ring frame. The sealing protrusion is disposed at the bottom of the outer ring frame. The inner bottom surface of the outer ring frame and the inner ring frame together define the drain hole.

[0014] As an optional solution, the number of the first drain holes is set to multiple, and the multiple first drain holes are evenly spaced along the circumference of the inner ring; and / or

[0015] The number of the second drain holes is set to multiple, and the multiple second drain holes are evenly spaced along the circumference of the outer ring portion; and / or

[0016] The number of the third drain holes is set to multiple, and the multiple third drain holes are evenly spaced along the circumference of the inner ring.

[0017] As an alternative, the outer ring is bowl-shaped, and the second drain hole is located at the bottom of the outer ring.

[0018] As an alternative, the first drain hole is wider at the outside and narrower at the inside, and / or the second drain hole is wider at the top and narrower at the bottom.

[0019] A pre-filter includes a filter bottle and a pre-filter drainage structure. The pre-filter drainage structure is disposed inside the filter bottle. A drainage port is provided at the bottom of the filter bottle. The drainage port can be selectively opened or closed. When the drainage port is opened, the inner cavity of the inner ring is connected to the drainage port.

[0020] The beneficial effects of this utility model are as follows:

[0021] This utility model provides a pre-filter drainage structure and a pre-filter. By opening a first drainage hole, a second drainage hole, and a third drainage hole on the support frame, two sets of drainage channels are formed. The first drainage hole can discharge the sewage and impurities after brushing inside the filter cylinder, while the second and third drainage holes can discharge the sewage and impurities outside the filter cylinder. After the drainage port is opened, sewage can be discharged from both the inside and outside of the filter cylinder simultaneously through the two sets of drainage channels, which can avoid the residue of impurities. Furthermore, the simultaneous discharge of sewage from both sets of drainage channels can ensure the rapid discharge of sewage and impurities from both sides of the filter cylinder during brushing, thereby improving the drainage efficiency. Attached Figure Description

[0022] To more clearly and understandably illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a cross-sectional view of the pre-filter provided in the embodiment of this utility model in the filtration state;

[0024] Figure 2 yes Figure 1 A magnified view of a section at point C;

[0025] Figure 3 This is a cross-sectional view of the support frame provided in an embodiment of the present utility model;

[0026] Figure 4 This is a schematic diagram of the support frame provided in an embodiment of the present utility model;

[0027] Figure 5 This is a cross-sectional view of the pre-filter provided in this embodiment of the present invention in the sewage discharge state;

[0028] Figure 6 yes Figure 5 A magnified view of a section at point D;

[0029] Figure 7 This is an isometric sectional view of the bracket provided in this embodiment of the utility model;

[0030] Figure 8 This is a schematic diagram of the scraping assembly provided in an embodiment of the present invention;

[0031] Figure 9 yes Figure 1 A magnified view of a section at point A in the middle;

[0032] Figure 10 yes Figure 5 A magnified view of a section at point B in the middle;

[0033] Figure 11 This is a cross-sectional view of the shunt component provided in an embodiment of the present utility model;

[0034] Figure 12 This is an exploded view of the flow-diverting shell provided in an embodiment of this utility model;

[0035] Figure 13 This is a schematic diagram of the structure of the flow divider housing provided in an embodiment of the present invention.

[0036] In the picture:

[0037] 10. Filter bottle; 11. Valve head; 111. Inlet channel; 112. Outlet channel; 113. First partition; 114. Second partition; 12. Bottle body; 121. Raw water chamber; 122. Clean water chamber; 123. Positioning groove; 124. Drain outlet; 125. Pressure chamber;

[0038] 20. Filter cartridge; 21. Filter screen; 22. Support; 221. Outer ring frame; 2211. Positioning protrusion; 2212. Sealing protrusion; 222. Inner ring frame; 223. Drain hole;

[0039] 30. Scraping assembly; 31. Rotating shaft; 32. Brush holder; 33. Brush; 331. Upper brush; 332. Lower brush; 34. Rotating blade; 35. Reinforcing rib; 36. First steel ball; 37. Second steel ball; 38. First stainless steel shaft; 39. Second stainless steel shaft;

[0040] 40. Diverter assembly; 41. Diverter housing; 411. Upper housing; 4111. Upper shoulder; 4112. Hook; 41121. Horizontal part; 41122. Vertical part; 412. Lower housing; 4121. Lower shoulder; 4122. Snap-fit; 413. Limiting ring; 414. Flow hole; 42. Diverter; 421. Sealing flange; 422. Guide vane; 423. Central shaft; 4231. First rotating hole; 43. First sealing ring; 44. Second sealing ring; 45. Third sealing ring;

[0041] 50. Support frame; 51. Outer ring; 511. Second drain hole; 52. Inner ring; 521. Second rotating hole; 522. First drain hole; 523. Third drain hole; 53. Fourth sealing ring; 54. Fifth sealing ring; 55. Sixth sealing ring;

[0042] 60. Return spring; 70. Compression spring; 80. Sealing base; 90. Drain valve. Detailed Implementation

[0043] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0044] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0045] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0046] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0047] This embodiment provides a pre-filter drainage structure and a pre-filter, the pre-filter including a filter bottle 10 and the aforementioned pre-filter drainage structure, wherein, as... Figure 1As shown, the filter bottle 10 includes a valve head 11 and a bottle body 12, which are separately arranged. The valve head 11 is usually made of copper, and the bottle body 12 is usually made of plastic, such as PPR, PC, PPA, etc. The bottle body 12 can be transparent or non-transparent. The valve head 11 is a T-shaped tee, including a lower port with internal threads at the bottom, an inlet channel 111 on the left side of the lower port, and an outlet channel 112 on the right side of the lower port. The left and right ends of the valve head 11 are used to fix the inlet pipe for water entering the filter bottle 10 and the drain pipe for water discharge. The upper end of the bottle body 12 is threaded to the lower port of the valve head 11. The bottle body 12 has a filter chamber. The bottom of the bottle body 12 has a drain port 124, which can be selectively opened or closed. The drain structure of the pre-filter is set in the filter chamber of the bottle body 12.

[0048] Specifically, such as Figure 1 As shown, the pre-filter's wastewater discharge structure includes a filter cartridge 20 and a support frame 50. The support frame 50 is located at the bottom of the filter cartridge 20. The filter cartridge 20 is disposed within the filter chamber and divides the filter chamber into a raw water chamber 121 located inside the filter cartridge 20 and a clean water chamber 122 located outside the filter cartridge 20. The raw water chamber 121 is connected to the inlet channel 111, and the clean water chamber 122 is connected to the outlet channel 112. This pre-filter has a filtration state and a wastewater discharge state. In the filtration state, raw water flows into the raw water chamber 121 through the inlet channel 111 and is filtered by the filter cartridge 20. The filtered clean water flows into the outlet channel 112 through the clean water chamber 122. Here, "raw water" refers to unfiltered water, and "clean water" refers to filtered water.

[0049] In other words, in the pre-filter provided in this embodiment, during filtration, the water first enters the interior of the filter cylinder 20, is filtered by the filter cylinder 20, and then flows out from the outside of the filter cylinder 20. The direction of water flow is from the inside of the filter cylinder 20 to the outside of the filter cylinder 20. The filtered impurities are blocked inside the filter cylinder 20. This arrangement is conducive to collecting the filtered impurities in the interior of the filter cylinder 20. When it is time to discharge sewage, the impurities can be quickly discharged from the bottom of the filter cylinder 20, making sewage discharge more convenient.

[0050] In this embodiment, as Figures 3 to 5As shown, the support frame 50 includes an inner ring portion 52 and an outer ring portion 51 connected to the outer periphery of the inner ring portion 52. The outer ring portion 51 is sealed and fitted to the inner wall of the bottle body 12, and a pressure chamber 125 is formed between the bottom of the outer ring portion 51 and the bottle body 12. The inner ring portion 52 is cylindrical and hollow. The inner ring portion 52 includes a first part that is sealed and passes through the bottom of the filter cylinder 20 and a second part located outside the filter cylinder 20. The outer ring portion 51 is the dividing line between the first part and the second part. The top of the inner ring portion 52 is closed, and the bottom of the inner ring portion 52 is open for drainage. The first part of the inner ring portion 52... The second part of the inner ring 52 has a first drain hole 522 on its side wall and a third drain hole 523 on its side wall. The third drain hole 523 is specifically opened at the opening end of the inner ring 52. The outer ring 51 has a second drain hole 511. In the draining state, the inner cavity of the filter cylinder 20, i.e. the raw water cavity 121, is connected to the inner cavity of the inner ring 52 through the first drain hole 522. The outer space of the filter cylinder 20, i.e. the clean water cavity 122, is connected to the inner cavity of the inner ring 52 through the second drain hole 511 and the third drain hole 523. The inner cavity of the inner ring 52 is connected to the drain port 124.

[0051] In the filtration state, the drain port 124 is opened, and the inner cavity of the filter cylinder 20, i.e. the raw water cavity 121, is connected to the drain port 124 through the first drain hole 522 and the inner cavity of the inner ring 52, thus forming a complete drain passage. The sewage and impurities in the raw water cavity 121 can flow through the first drain hole 522 to the inner cavity of the inner ring 52, and then flow out from the drain port 124. This is beneficial for the sewage and impurities during the internal cleaning of the filter cylinder 20 to be quickly discharged through this drain passage.

[0052] During sewage discharge, some wastewater will pass through the filter cartridge 20 and flow into the clean water chamber 122. The design of the second drain hole 511 and the third drain hole 523 is to discharge the wastewater and small particulate impurities in the clean water chamber 122, avoiding the residue of wastewater and impurities. Specifically, in the sewage discharge state, the clean water chamber 122 can be connected to the drain port 124 through the second drain hole 511, the pressure chamber 125, the third drain hole 523, and the inner cavity of the inner ring 52, thus forming a complete sewage discharge path. The wastewater and impurities in the clean water chamber 122 flow through the second drain hole 511 to the pressure chamber 125, then through the third drain hole 523 into the inner cavity of the inner ring 52, and finally discharged from the drain port 124. This facilitates the rapid discharge of wastewater and impurities outside the filter cartridge 20 through this sewage discharge path.

[0053] Therefore, in this embodiment, by opening a first drain hole 522, a second drain hole 511, and a third drain hole 523 on the support frame 50, two sets of drain passages are formed. The first drain hole 522 can discharge the sewage and impurities inside the filter cylinder 20 after brushing, while the second drain hole 511 and the third drain hole 523 can discharge the sewage and impurities outside the filter cylinder 20. After the drain port 124 is opened, the two sets of drain passages can simultaneously discharge sewage from both the inside and outside of the filter cylinder 20, which can avoid the residue of impurities. Furthermore, the simultaneous discharge of sewage from both sets of drain passages can ensure the rapid discharge of sewage and impurities from both sides of the filter cylinder 20 during brushing, thereby improving the sewage discharge efficiency.

[0054] Specifically, in this embodiment, as Figure 2 As shown, the bottom of the filter cylinder 20 is provided with a sealing protrusion ring 2212 and a drain hole 223 communicating with the inner cavity of the filter cylinder 20. The support frame 50 can move axially relative to the filter cylinder 20 between the filtration position and the drain position. When the support frame 50 is in the drain position, the first drain hole 522 coincides with the drain hole 223 and is connected, and the second drain hole 511 is open. When the support frame 50 is in the filtration position, the first drain hole 522 is offset from the drain hole 223 and is closed, and the sealing protrusion ring 2212 blocks the second drain hole 511.

[0055] like Figure 1 and Figure 2 As shown, in the filtration state, with the drain port 124 closed, the support frame 50 moves upward relative to the bracket 22 to the filtration position. At this time, the first drain hole 522 and the drain hole 223 are staggered and closed, and the sealing ring 2212 blocks the second drain hole 511. In this state, only filtration is performed, and sewage discharge is not possible. Figure 5 and Figure 6 As shown, in the sewage discharge state, the support frame 50 moves down relative to the filter cylinder 20 to the sewage discharge position. At this time, the first sewage discharge hole 522 and the drain hole 223 are completely overlapped and connected, and the sealing ring 2212 moves up, causing the second sewage discharge hole 511 to open. The raw water chamber 121 is connected to the sewage outlet 124 through the drain hole 223, the first sewage discharge hole 522, and the inner cavity of the inner ring 52 in sequence. Therefore, the sewage and impurities in the raw water chamber 121 can flow through the drain hole 223 and the multiple first sewage discharge holes 522 to the inner cavity of the inner ring 52 in sequence. The wastewater flows out of the drain port 124, which facilitates the rapid discharge of wastewater and impurities during the internal washing of the filter cartridge 20. At the same time, the clean water chamber 122 is connected to the drain port 124 in sequence through the second drain hole 511, the pressure chamber 125, the third drain hole 523, and the inner cavity of the inner ring 52. The wastewater and impurities in the clean water chamber 122 can flow to the pressure chamber 125 through the second drain hole 511, and then flow into the inner cavity of the inner ring 52 through the third drain hole 523, and finally be discharged from the drain port 124, which facilitates the rapid discharge of wastewater and impurities from the outside of the filter cartridge 20.

[0056] In an optional embodiment, such as Figure 6 As shown, the drain hole 223 is arranged to gradually slope downwards from the outside to the inside along the radial direction of the filter cylinder 20. The inclined drain hole 223 facilitates the rapid discharge of sewage and impurities during the internal washing of the filter cylinder 20, thereby improving the sewage discharge capacity and efficiency.

[0057] In an optional embodiment, such as Figure 4 As shown, the number of first drain holes 522 is set to multiple, and the multiple first drain holes 522 are evenly distributed along the circumference of the inner ring 52. The multiple first drain holes 522 facilitate the rapid discharge of sewage and impurities during the internal washing of the filter cylinder 20, thereby improving the sewage discharge capacity and efficiency.

[0058] In this embodiment, six evenly arranged first drain holes 522 are provided on the periphery of the inner ring portion 52, which can effectively and quickly discharge the sewage and impurities washed down from the inside of the filter cartridge 20. In other optional embodiments, the number of first drain holes 522 can also be set to any number from three to eight. The size of the first drain holes 522 can be adaptively adjusted according to the change in number to ensure rapid sewage discharge. No specific limitation is made here.

[0059] In an optional embodiment, the first drain hole 522 can be designed with a structure that is wider on the outside and narrower on the inside, that is, the end near the outer side of the inner ring 52 is wider and the end near the inner side of the inner ring 52 is narrower. By utilizing the Venturi effect, sewage can be discharged faster and is less likely to deposit in the first drain hole 522.

[0060] In this embodiment, as Figure 3 As shown, the outer ring 51 is bowl-shaped, and the second drain hole 511 is located at the bottom of the outer ring 51. When the outer ring 51 is filled with sewage, the pressure at the bottom of the bowl is increased by the upper part being wider and the lower part being narrower, which can accelerate the water discharge speed of the second drain hole 511, thus making it less prone to scale buildup.

[0061] In an optional embodiment, such as Figure 3 As shown, the second drain hole 511 can be designed with a structure that is wider at the top and narrower at the bottom. By utilizing the Venturi effect, sewage can be discharged more quickly and is less likely to deposit in the second drain hole 511.

[0062] In this embodiment, as Figure 4 As shown, two second drain holes 511 and two third drain holes 523 are symmetrically arranged to ensure that sewage and impurities in the water purification chamber 122 can be discharged in a timely and rapid manner. In other optional embodiments, the number of second drain holes 511 and third drain holes 523 can be set according to actual needs, and no specific limitation is made here.

[0063] Optionally, such as Figure 5 As shown, the filter cylinder 20 includes a filter screen 21 and a support 22. The filter screen 21 is a cylindrical structure with openings at both ends. By setting the cylindrical filter screen 21, the effective filtration area can be increased, the filtration effect on the water flow can be improved, and the flow rate of water through the filter screen 21 can be guaranteed. The support 22 is fitted and sleeved on the outside of the filter screen 21 to support the filter screen 21 and prevent the filter screen 21 from deforming under water pressure and losing its filtration effect.

[0064] Optionally, combined Figure 5 and Figure 7 At least two positioning protrusions 2211 are provided on the upper periphery of the bracket 22. The positioning protrusions 2211 are engaged with the positioning grooves 123 on the inner side of the top of the bottle body 12, so that the filter cartridge 20 can be positioned inside the bottle body 12 to prevent the filter cartridge 20 from deflecting.

[0065] In an optional embodiment, such as Figure 6 and Figure 7 As shown, the bracket 22 includes an outer ring bracket 221 and an inner ring bracket 222. The outer ring bracket 221 is fitted and sleeved on the outside of the filter screen 21. The inner ring bracket 222 is connected to the bottom inner side of the outer ring bracket 221. The inner ring portion 52 is sealed and inserted into the inner ring bracket 222. The inner bottom surface of the outer ring bracket 221 is gradually inclined downward from the outside to the inside along its radial direction and together with the inner ring bracket 222 defines the aforementioned drain hole 223. A sealing protrusion ring 2212 is formed at the bottom of the outer ring bracket 221. Figure 2 As shown, in the filtration state, the support frame 50 moves upward relative to the filter cylinder 20 to the filtration position. At this time, the drain hole 223 is blocked by the inner ring part 52, and the first drain hole 522 is blocked by the inner ring frame 222. Therefore, the first drain hole 522 and the drain hole 223 are in a staggered and closed state.

[0066] Optionally, such as Figure 6 As shown, the inner ring 52 and the bracket 22 are sealed by two fourth sealing rings 53. The two fourth sealing rings 53 are embedded in the sealing groove of the inner ring 52 and are located on the upper and lower sides of the first drain hole 522, respectively. Figure 2 As shown, when the support frame 50 is in the filtration position, the first drain hole 522 and the drain hole 223 are misaligned and blocked by the inner ring frame 222. The two fourth sealing rings 53 abut against the inner wall of the inner ring frame 222 to achieve a seal, preventing sewage leakage during filtration. Figure 6 As shown, when the support frame 50 is in the sewage discharge position, the first sewage discharge hole 522 coincides with the sewage discharge hole 223, one of the fourth sealing rings 53 abuts against the inner wall of the inner ring frame 222, and the other fourth sealing ring 53 abuts against the inner wall of the outer ring frame 221, thereby achieving a sealing setting in the sewage discharge state.

[0067] Optionally, such as Figure 6As shown, a fifth sealing ring 54 is provided between the outer periphery of the outer ring portion 51 and the inner wall of the bottle body 12. The fifth sealing ring 54 is embedded in the sealing groove on the outer periphery of the outer ring portion 51, thereby achieving a seal between the outer ring portion 51 and the inner wall of the bottle body 12.

[0068] Optionally, such as Figure 2 As shown, a sixth sealing ring 55 is embedded on the inner bottom side of the outer ring 51. The outer ring 51 and the sealing protrusion 2212 are sealed by the sixth sealing ring 55. When the support frame 50 is in the filter position, the sealing protrusion 2212 presses against the sixth sealing ring 55, thereby blocking the second drain hole 511. Optionally, the fourth sealing ring 53, the fifth sealing ring 54, and the sixth sealing ring 55 can all be O-rings.

[0069] In this embodiment, as Figure 5 and Figure 8 As shown, the pre-filter also includes a scraping assembly 30, which is rotatably disposed inside the filter cylinder 20. The scraping assembly 30 includes a rotating shaft 31, on which a plurality of brush holders 32 are connected at intervals along its circumference. Each brush holder 32 is composed of a plurality of rods connected together, and each brush holder 32 is provided with a brush 33 on its outer periphery.

[0070] In the filtration state, some impurities may adhere to the inner wall of the filter screen 21. In the drain state, the drain port 124 is opened, and the water flow continuously impacts the scraping component 30. The rotating shaft 31 drives the brush holder 32 and the brush 33 to move in a circular motion around the axis of the rotating shaft 31. When the brush 33 rotates, it can brush away the impurities attached to the inner wall of the filter screen 21, improve the brushing effect, and make the accumulated impurities fall off the inner wall of the filter screen 21. They are then discharged from the drain holes of the support frame 50 and the drain port 124 in sequence with the water flow, realizing the automatic cleaning of the filter screen 21. This allows the filtration effect of the filter screen 21 to continue to play its role. The entire cleaning process only requires manual opening of the drain port 124, which is convenient and quick to operate, greatly reducing the difficulty of cleaning the filter screen 21.

[0071] Specifically, such as Figure 8 As shown, the brush is divided into an upper brush 331 and a lower brush 332. The upper brush 331 and the lower brush 332 are set on different brush holders 32. The upper brush 331 and the lower brush 332 are of equal length, and their sum covers the entire length of the brush holder 32. That is to say, the sum of the lengths of the upper brush 331 and the lower brush 332 is exactly equal to the length of the brush holder 32, so that it can exactly cover the entire length of the brush holder 32. Of course, the sum of the lengths of the upper brush 331 and the lower brush 332 can also be slightly greater than the length of the brush holder 32, so that the ends of the upper brush 331 and the lower brush 332 overlap to ensure full coverage of the scraping area.

[0072] The upper brush 331 can clean the upper half of the filter cylinder 20, and the lower brush 332 can clean the lower half of the filter cylinder 20. This arrangement can reduce costs and ensure the rotational stability of the entire scraping assembly 30. Furthermore, the staggered installation of the upper brush 331 and the lower brush 332 allows impurities in the upper and lower parts of the filter cylinder 20 to be discharged intermittently, reducing the pressure of sewage discharge and helping to improve sewage discharge efficiency.

[0073] In this embodiment, the number of brush holders 32 can be set to four. In other optional embodiments, the number of brush holders 32 can also be set to other numbers, which can be adapted according to actual needs, and no specific limitation is made here.

[0074] Taking the four brush holders 32 in this embodiment as an example, in one optional embodiment, the upper brush 331 and the lower brush 332 can be respectively arranged on two adjacent brush holders 32. In another optional embodiment, the upper brush 331 and the lower brush 332 can also be respectively arranged on two opposite brush holders 32, without specific limitations.

[0075] In an optional embodiment, such as Figure 8 As shown, reinforcing ribs 35 connect the upper ends of each brush holder 32, and reinforcing ribs 35 also connect the lower ends of each brush holder 32. This arrangement allows the reinforcing ribs 35 to fix each brush holder 32 together as a whole, improving the structural strength of each brush holder 32 and making the entire scraping assembly 30 more robust and durable.

[0076] In an optional embodiment, such as Figure 1 and Figure 9 As shown, the pre-filter also includes a diversion assembly 40, which includes a diverter 42. The diverter 42 is a hollow shell structure with open ends. Multiple evenly distributed guide vanes 422 are provided inside the top of the diverter 42. Multiple evenly spaced rotating blades 34 are connected to the top periphery of the rotating shaft 31. The rotating blades 34 pass through the diverter 42 and are located below the guide vanes 422. In the discharge state, water flows from the top of the diverter 42 and, after passing through the guide vanes 422, forms a vortex with rotational impact. The vortex impacts the rotating blades 34, causing the rotating blades 34 to drive the rotating shaft 31 to rotate. The rotating shaft 31 drives the brush holder 32 and the brush 33 to perform circular motion, thereby washing away impurities attached to the inner wall of the filter screen 21.

[0077] In this embodiment, the number of rotating blades 34 can be set to six. In other optional embodiments, the number of rotating blades 34 can also be set to other numbers, which can be adapted according to actual needs, and no specific limitation is made here.

[0078] Optionally, such as Figure 6 and Figure 9As shown, the top end of the rotating shaft 31 abuts against the diverter 42, and the bottom end of the rotating shaft 31 abuts against the support frame 50. In addition to the above-mentioned sewage discharge function, the support frame 50 can also support and limit the scraping assembly 30. The upper end of the rotating shaft 31 is supported by the diverter 42, and the lower end of the rotating shaft 31 is supported by the support frame 50. The rotating shaft 31 can rotate relative to the diverter 42 and the support frame 50, but the diverter 42 and the support frame 50 themselves do not rotate.

[0079] In an optional embodiment, such as Figure 9 As shown, the top end of the rotating shaft 31 abuts against the distributor 42 via the first steel ball 36, as... Figure 6 As shown, the bottom end of the rotating shaft 31 abuts against the support frame 50 via the second steel ball 37. Therefore, a point-to-surface contact is formed between the top end of the rotating shaft 31 and the first steel ball 36, and a point-to-surface contact is formed between the bottom end of the rotating shaft 31 and the second steel ball 37. The contact area is extremely small, mainly bearing local loads, thus reducing the frictional force borne by the rotating shaft 31 during rotation, thereby making the rotation smoother and increasing the effective work done by the rotational motion.

[0080] In an optional embodiment, such as Figure 9 As shown, a first stainless steel shaft 38 is inserted through the top end of the rotating shaft 31, and the first stainless steel shaft 38 abuts against the first steel ball 36, as... Figure 6 As shown, a second stainless steel shaft 39 is inserted through the bottom end of the rotating shaft 31, and the second stainless steel shaft 39 abuts against the second steel ball 37. Therefore, both ends of the rotating shaft 31 are in direct contact with the steel ball through the stainless steel shaft. The stainless steel shaft can withstand the local load in the spherical-plane contact connection. This design increases the service life of the rotating shaft 31 and reduces the cost of using stainless steel material for the rotating shaft 31.

[0081] Specifically, such as Figure 11 As shown, a central shaft 423 is connected to the center of multiple guide vanes 422. A first rotating hole 4231 is opened in the central shaft 423. Part of the first steel ball 36 is housed in the first rotating hole 4231 for limiting installation, so as to prevent the first steel ball 36 from deviating during the rotation of the rotating shaft 31; similarly, as Figure 3 As shown, a second rotation hole 521 is provided at one end of the support base near the rotating shaft 31. Part of the second steel ball 37 is housed in the second rotation hole 521 for limiting installation, so as to prevent the second steel ball 37 from running off-center during the rotation of the rotating shaft 31.

[0082] In an optional embodiment, such as Figure 1As shown, the diversion assembly 40 also includes a diversion housing 41, which is a hollow housing structure with both ends open. The diversion housing 41 is located between the top of the filter cartridge 20 and the valve head 11. The inlet water channel 111 is connected to the raw water chamber 121 through the inner cavity of the diversion housing 41, and the purified water chamber 122 is connected to the outlet water channel 112 through the outer space of the diversion housing 41.

[0083] In the filtration state, the water flow direction in the pre-filter is as follows: raw water first enters from the inlet channel 111, flows through the inner cavity of the diversion housing 41 into the raw water chamber 121 inside the filter cartridge 20, enters the clean water chamber 122 after being filtered by the filter cartridge 20, and then flows along the inner wall of the bottle 12 to the outer space of the diversion housing 41, and finally flows out from the outlet channel 112. Therefore, the inner cavity of the diversion shell 41 is the path through which raw water flows from the inlet channel 111 to the raw water chamber 121 during filtration, while the outer space of the diversion shell 41 is the path through which filtered purified water flows out of the purified water chamber 122 of the pre-filter. The diversion shell 41 isolates unfiltered water from filtered water, i.e., raw water and purified water. The inner side of the diversion shell 41 contains unfiltered water, and the outer side contains filtered water. The diversion shell 41 determines the direction of water flow from the inside of the filter cylinder 20 to the outside of the filter cylinder 20, which is conducive to collecting the filtered impurities inside the filter cylinder 20. When it is time to discharge sewage, the impurities can be quickly discharged from the bottom of the filter cylinder 20, making sewage discharge more convenient.

[0084] In an optional embodiment, the diverter 42 is circumferentially fixed within the diverter housing 41 and is axially movable relative to the diverter housing 41 between a filtration position and a drain position; such as Figure 1 and Figure 9 As shown, when the drain outlet 124 is closed, the diverter 42 is in the filtration position, and the inlet channel 111 is connected to the original water chamber 121 through the inner cavity of the diverter housing 41; Figure 5 and Figure 10 As shown, when the drain outlet 124 is opened, the diverter 42 is in the drain position, and the inlet channel 111 is connected to the original water chamber 121 through the inner cavity of the diverter 42.

[0085] In other words, such as Figure 1 and Figure 9 As shown, in the filtration state, the drain outlet 124 is closed, causing the distributor 42 to move upward to the filtration position. At this time, the inner cavity of the distributor 42 is not filled with water. The inlet channel 111 is connected to the raw water cavity 121 through the inner cavity of the distributor housing 41. Raw water enters from the inlet channel 111, flows through the inner cavity of the distributor housing 41, and then enters the raw water cavity 121 inside the filter screen 21. After being filtered by the filter screen 21, it enters the clean water cavity 122 and finally flows out from the outlet channel 112. Figure 5 and Figure 10As shown, in the sewage discharge state, the sewage outlet 124 is opened, causing the diverter 42 to descend to the sewage discharge position. At this time, the inner cavity of the diverter housing 41 is not filled with water. The water inlet channel 111 is connected to the original water chamber 121 through the inner cavity of the diverter 42. After the water flows in from the water inlet channel 111, it flows through the inner cavity of the diverter 42, and the resulting vortex impacts the rotating blades 34 of the scraping assembly 30, thereby driving the scraping assembly 30 to rotate and scrape off the impurities attached to the inner wall of the filter screen 21, which are then discharged from the sewage outlet 124 with the water flow. Therefore, by closing or opening the sewage outlet 124, the position of the diverter 42 can be switched, thereby further realizing the automatic switching between the filtered water path and the sewage discharge path, making the pre-filter automatically switch working modes, which is convenient to operate.

[0086] Specifically, such as Figure 9 As shown, the bottom of the diverter housing 41 has a flow hole 414, and the inner cavity of the diverter housing 41 is connected to the raw water chamber 121 through the flow hole 414. The periphery of the diverter 42 is provided with a sealing flange 421. When the diverter 42 is in the filtration position, the top opening of the diverter 42 abuts against and is blocked by the top inner wall of the valve head 11, and the sealing flange 421 opens the flow hole 414. When the diverter 42 is in the sewage discharge position, the sealing flange 421 blocks the flow hole 414, and the top opening of the diverter 42 disengages from the top inner wall of the valve head 11 and is opened.

[0087] like Figure 9 As shown, in the filtration state, the diverter 42 moves upward to the filtration position, and the top of the diverter 42 abuts against the inner wall of the top of the valve head 11, thereby sealing the top opening of the diverter 42. Therefore, the inner cavity of the diverter 42 is not flowing with water at this time. At this time, the sealing flange 421 moves upward to open the flow hole 414, so the inner cavity of the diverter housing 41 is flowing with water, and the water inlet channel 111 is connected to the original water cavity 121 through the inner cavity of the diverter housing 41. Figure 10 As shown, in the sewage discharge state, the diverter 42 moves downward to the sewage discharge position. At this time, the sealing flange 421 moves down to block the flow hole 414. Therefore, the inner cavity of the diverter housing 41 is not filled with water. Meanwhile, the top of the diverter 42 disengages from the inner wall of the valve head 11, thereby opening the top opening of the diverter 42. Thus, the inner cavity of the diverter 42 is filled with water, and the inlet channel 111 connects with the original water chamber 121 through the inner cavity of the diverter 42. Therefore, through the above arrangement, the switching between the filtered water path and the sewage discharge path can be cleverly achieved.

[0088] Specifically, such as Figure 1 As shown, the valve head 11 has a first baffle 113 and a second baffle 114. The first baffle 113 is horizontally arranged and located at the outlet of the inlet channel 111, and the second baffle 114 is vertically arranged and located at the inlet of the outlet channel 112. Combined with... Figure 9 and Figure 11The outer periphery of the diversion housing 41 has an upper shoulder 4111 and a lower shoulder 4121. The lower shoulder 4121 abuts against the upper end face of the bracket 22, and the upper shoulder 4111 abuts against the lower end faces of the first partition 113 and the second partition 114. The first partition 113 is used to isolate the outer space of the diversion housing 41 from the water inlet channel 111, and the second partition 114 is used to isolate the water inlet channel 111 from the water outlet channel 112. By adopting the above configuration, the diversion housing 41 can be installed in a limited position, providing a flow channel for water.

[0089] In an optional embodiment, such as Figure 9 As shown, a first sealing ring 43 is provided between the upper shoulder 4111 and the first partition 113 and the second partition 114 to achieve a sealing performance at the abutment position of the upper shoulder 4111 and the first partition 113 and the second partition 114. A second sealing ring 44 is provided between the lower shoulder 4121 and the filter cylinder 20 to achieve a sealing performance at the abutment position of the lower shoulder 4121 and the filter cylinder 20, thereby providing a sealed flow channel for water flow. The first sealing ring 43 and the second sealing ring 44 can be selected as O-rings.

[0090] Optionally, such as Figure 11 As shown, the diversion housing 41 includes a separate upper housing 411 and a lower housing 412 with identical structures. The upper housing 411 and the lower housing 412 are interlocked and detachably connected. The outer periphery of the upper housing 411 is provided with an upper shoulder 4111, and the outer periphery of the lower housing 412 is provided with a lower shoulder 4121. The diversion housing 41 is easy to assemble and disassemble, facilitates cleaning of its interior, and is easy to manufacture.

[0091] In an optional embodiment, a third sealing ring 45 is provided between the mating surfaces of the upper housing 411 and the lower housing 412. The third sealing ring 45 enables a sealing performance between the upper housing 411 and the lower housing 412, thereby providing a sealed flow channel for water. The third sealing ring 45 can be an O-ring.

[0092] In an optional embodiment, the upper housing 411 and the lower housing 412 are screwed together via a snap-fit ​​structure. Specifically, as shown... Figure 12As shown, the snap-fit ​​structure includes a matching buckle 4122 and a hook 4112. A U-shaped buckle 4122 is provided on the outer periphery of the lower housing 412, with its opening facing the axis of the lower housing 412. A hook 4112 is provided on the outer periphery of the upper housing 411. The hook 4112 is L-shaped and includes a horizontal portion 41121 and a vertical portion 41122 connected vertically. The horizontal portion 41121 engages with the opening of the buckle 4122. After the upper housing 411 and lower housing 412 are snapped together, rotating the upper housing 411 causes the horizontal portion 41121 to insert circumferentially into the opening of the buckle 4122, while the vertical portion 41122 abuts against the side of the hook 4112, forming a limiting position. Through the engagement of the buckle 4122 and the hook 4112, a circumferential and axial limiting connection between the upper housing 411 and lower housing 412 is achieved, and the connection is quick and convenient.

[0093] In another optional embodiment, a hook 4112 can be provided on the outer periphery of the lower housing 412, and a buckle 4122 can be provided on the outer periphery of the upper housing 411, achieving the same effect. In another optional embodiment, both a hook 4112 and a buckle 4122 can be provided on the outer periphery of the lower housing 412, and both a buckle 4122 and a hook 4112 corresponding to and cooperating with the lower housing 412 can be provided on the outer periphery of the upper housing 411.

[0094] Optionally, the number of the aforementioned buckles 4122 and hooks 4112 can be set to two, three or more evenly spaced along the circumference, which can be flexibly set according to actual needs, and no specific limitation is made here.

[0095] In an optional embodiment, such as Figure 13 As shown, both the upper housing 411 and the lower housing 412 of the diverter housing 41 are connected to limiting rings 413. The outer wall of the lower limiting ring 413 and the inner wall of the lower housing 412 form the aforementioned flow passage 414. The diverter 42 passes through the inner hole of the limiting ring 413 and is circumferentially limited by the limiting ring 413, thereby preventing the diverter 42 from rotating under the impact of water flow. Specifically, to limit the rotation of the diverter 42, in an optional embodiment, as shown... Figure 13 As shown, the inner hole of the limiting ring 413 can be a non-circular hole, such as a regular square or regular pentagon, and the circumferential contour of the diverter 42 can be adapted to the inner hole of the limiting ring 413. In another optional embodiment, the limiting ring 413 and the diverter 42 can also be a combination of ribs and grooves to prevent rotation.

[0096] In an optional embodiment, such as Figure 1As shown, to open or close the drain port 124, the pre-filter also includes a sealing base 80 and a drain valve 90. The sealing base 80 is sealed inside the drain port 124, and a drain channel communicating with the bottle body 12 is opened inside the sealing base 80. The drain valve 90 is threadedly connected to the sealing base 80 and is used to open or close the drain channel, thereby opening or closing the drain port 124, which is convenient and quick to operate. In this embodiment, the drain valve 90 can be a ball valve, the specific structure and working principle of which are existing technologies and will not be described in detail here. In one optional embodiment, the opening and closing of the drain valve 90 can be manually controlled by the operator, which is convenient and low-cost; in another optional embodiment, the opening and closing of the drain valve 90 can also be controlled by a motor or electromagnetic actuator. In another optional embodiment, to open or close the drain port 124, a plug can also be threadedly connected inside the sealing base 80.

[0097] Furthermore, such as Figure 1 As shown, the pre-filter also includes a reset spring 60 and a pressure spring 70. The reset spring 60 abuts between the diverter 42 and the diverter housing 41, specifically between the sealing flange 421 of the diverter 42 and the upper limiting ring 413 inside the diverter housing 41. The pressure spring 70 abuts between the bottom of the bottle body 12 and the support frame 50, specifically between the sealing base 80 and the support frame 50. The pressure chamber 125 at the bottom of the support frame 50 is connected to the drain port 124. Figure 1 and Figure 2 As shown, when the drain outlet 124 is closed, the pressure chamber 125 is under high pressure and supports the support frame 50 upwards. The scraping assembly 30, under the action of the pressure spring 70, moves upwards with the support frame 50 and pushes the diverter 42 upwards, causing the diverter 42 to move to the filtration position and compress the reset spring 60; Figure 5 and Figure 6 As shown, when the drain outlet 124 is opened, the pressure in the pressure chamber 125 decreases, the support frame 50 moves down and compresses the pressure spring 70. At this time, the original water chamber 121 is connected to the drain outlet 124 through the support frame 50. The scraping assembly 30 moves down with the support frame 50, and the diverter 42 moves down with the scraping assembly 30 under the action of the reset spring 60, so that the diverter 42 moves to the drain position.

[0098] Specifically, such as Figure 1 and Figure 2As shown, in the filtration state, the drain port 124 is closed and the pressure chamber 125 is sealed, so the pressure chamber 125 is under high pressure, which can support the support frame 50 upward. The pressure spring 70 is in the reset state and supports the support frame 50 at the same time. The scraping assembly 30 moves upward with the support frame 50 under the action of the pressure spring 70 and pushes the diverter 42 upward, so that the diverter 42 is stabilized in the filtration position and the reset spring 60 is compressed. That is, the diverter 42 abuts against the inner wall of the top of the valve head 11. The inner cavity of the diverter 42 is not filled with water. The water inlet channel 111 is connected to the raw water chamber 121 through the inner cavity of the diverter housing 41. The raw water enters from the water inlet channel 111, flows through the inner cavity of the diverter housing 41 and enters the raw water chamber 121 inside the filter screen 21. After being filtered by the filter screen 21, it enters the clean water chamber 122 and finally flows out from the water outlet channel 112.

[0099] like Figure 5 and Figure 6 As shown, in the drain state, the drain port 124 is open, and the pressure in the pressure chamber 125 is released to atmospheric pressure. Therefore, the pressure in the pressure chamber 125 decreases, and the pressure below the support frame 50 drops instantaneously, thus creating a pressure difference between the upper and lower sides of the support frame 50 inside the bottle body 12. Under the action of the pressure difference, the support frame 50 moves downward, and the scraping assembly 30 moves downward with the support frame 50 under the force of attraction, compressing the pressure spring 70. At this time, the reset spring 60 resets, and the diverter 42 moves downward with the scraping assembly 30 under the action of the reset spring 60, causing the diverter 42 to move from the filtration position to the drain position. In the drain position, the sealing flange 421 of the diverter 42 and The diverter housing 41 fits snugly to block the flow hole 414, and the support frame 50 abuts against the sealing base 80. At this time, the inner cavity of the diverter housing 41 is not filled with water, and the inner cavity of the diverter housing 41 is filled with water and can press the diverter 42. The inlet channel 111 is connected to the original water chamber 121 through the inner cavity of the diverter 42. The original water chamber 121 is connected to the drain port 124 through the support frame 50. After the water flows in from the inlet channel 111, it flows through the inner cavity of the diverter 42. The resulting vortex impacts the rotating blades 34 of the scraping assembly 30, thereby driving the scraping assembly 30 to rotate and scrape off the impurities attached to the inner wall of the filter screen 21. The impurities are then discharged through the support frame 50 and the drain port 124 with the water flow.

[0100] After the sewage discharge is completed, when the sewage outlet 124 is closed again, the pressure in the pressure chamber 125 will gradually increase, driving the support frame 50 to gradually move upward. The pressure spring 70 will reset, and under the action of the pressure spring 70, the scraping assembly 30 and the diverter 42 will also move upward and switch back to the filtration position.

[0101] As can be seen from this, the pre-filter provided in this application switches the drain port 124 between closed and open states via the drain valve 90, thereby opening and closing the pressure chamber 125. The pressure change within the pressure chamber 125 causes changes in the states of the pressure spring 70 and the return spring 60, thus switching between the filtration and drain states. In other words, switching between the filtration and drain functions of the pre-filter only requires operating the drain valve 90 to switch the states of the drain port 124 and the pressure chamber 125 with a single button. The switching operation is simple, quick, time-saving, and labor-saving, improving the user experience.

[0102] The working principle of the pre-filter provided in this embodiment is as follows:

[0103] Combination Figure 1 , Figure 2 and Figure 9 In the filtration state, the drain port 124 is closed by the drain valve 90, and the pressure chamber 125 is sealed. Therefore, the pressure chamber 125 is under high pressure, which can support the support frame 50 upwards. The pressure spring 70 is in the reset state and simultaneously supports the support frame 50. Under the action of the pressure spring 70, the scraping assembly 30 moves upwards with the support frame 50 and pushes the diverter 42 upwards, so that the diverter 42 is stabilized in the filtration position and the reset spring 60 is compressed. At this time, the diverter 42 abuts against the inner wall of the top of the valve head 11, and the top opening of the diverter 42 is blocked. Therefore, the inner cavity of the diverter 42 is not flowing with water. At this time, the sealing flange 421 moves upwards and opens the flow hole 414. Therefore, the inner cavity of the diverter housing 41 is flowing with water, and the water inlet channel 1... 11. The water supply is connected to the raw water chamber 121 through the inner cavity of the diversion housing 41 and the flow hole 414. At the same time, the support frame 50 is also located in the filtration position. The inner ring 52 is disengaged from the sealing base 80. The first drain hole 522 and the drain hole 223 are staggered and closed. At the same time, the sealing convex ring 2212 blocks the second drain hole 511. All drain passages are closed. In this state, only filtration is performed and no draining is possible. Raw water enters from the inlet channel 111, flows through the inner cavity of the diversion housing 41 and enters the raw water chamber 121 inside the filter screen 21. After being filtered by the filter screen 21, it enters the clean water chamber 122, and then flows along the inner wall of the bottle 12 to the outer space of the diversion housing 41. Finally, it flows out from the outlet channel 112. Figure 1 The direction of the arrow in the diagram indicates the direction of water flow.

[0104] Combination Figure 5 , Figure 6 and Figure 10In the drain state, the drain port 124 is closed by the drain valve 90, and the pressure in the pressure chamber 125 is released to atmospheric pressure. Therefore, the pressure in the pressure chamber 125 decreases, and the pressure below the support frame 50 drops instantaneously, thus creating a pressure difference between the upper and lower sides of the support frame 50 inside the filter bottle 10. Under the action of the pressure difference, the support frame 50 moves downward, and the scraping assembly 30 moves downward with the support frame 50 under the force of attraction, compressing the pressure spring 70. At this time, the return spring 60 returns to its original position, and the diverter 42 is activated by the return spring 60. As the scraping assembly 30 moves downward, the diverter 42 moves from the filtration position to the drain position. In the drain position, the top of the diverter 42 disengages from the inner wall of the valve head 11, thereby opening the top opening of the diverter 42. At the same time, the sealing flange 421 of the diverter 42 fits against the diverter housing 41 to block the flow hole 414. At this time, the inner cavity of the diverter housing 41 is not filled with water, and the inner cavity of the diverter housing 41 is filled with water and can press the diverter 42 tightly. The water inlet channel 111 is connected to the original water chamber 121 through the inner cavity of the diverter 42. Meanwhile, the support frame 50 is also located at the sewage discharge position. At this time, the first sewage discharge hole 522 and the sewage drain hole 223 are completely overlapped, and the inner ring 52 abuts against the sealing base 80. The raw water chamber 121 is connected to the sewage outlet 124 through the sewage drain hole 223, the first sewage discharge hole 522, and the inner cavity of the inner ring 52. At the same time, the sealing convex ring 2212 opens the second sewage discharge hole 511, and the clean water chamber 122 is connected to the sewage outlet 124 through the second sewage discharge hole 511, the third sewage discharge hole 523, and the inner cavity of the inner ring 52. After the water flows in from the water inlet channel 111, it flows through the inner cavity of the diverter 42, and the resulting vortex impacts the rotating blades 34 of the scraping assembly 30, thereby driving the scraping assembly 30 to rotate and scrape off the impurities attached to the inner wall of the filter screen 21, such as... Figure 5 As indicated by the solid arrow, the sewage and impurities in the original water chamber 121 flow through the drain hole 223 and the first drain hole 522 into the inner cavity of the inner ring 52. Figure 5 In the direction of the dotted arrow, the sewage and impurities in the clean water chamber 122 flow through the second drain hole 511 to the pressure chamber 125, and then flow into the inner cavity of the inner ring 52 through the third drain hole 523. Finally, they are discharged through the drain port 124 and the drain valve 90.

[0105] After the sewage discharge is completed, the sewage outlet 124 is closed by the sewage discharge valve 90. The pressure in the pressure chamber 125 will gradually increase and drive the support frame 50 to move upward. The pressure spring 70 will reset. Under the action of the pressure spring 70, the scraping assembly 30 and the diverter 42 will also move upward and switch back to the filtration position.

[0106] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. The sewage discharge structure of a pre-filter, characterized in that, The filter includes a filter cartridge (20) and a support frame (50). The support frame (50) includes an inner ring portion (52) and an outer ring portion (51) connected to the outer periphery of the inner ring portion (52). The inner ring portion (52) is hollow and includes a first part that is sealed and passes through the bottom of the filter cartridge (20) and a second part located outside the filter cartridge (20). A first drain hole (522) is provided on the side wall of the first part, a third drain hole (523) is provided on the side wall of the second part, and a second drain hole (511) is provided on the outer ring portion (51). In the drain state, the inner cavity of the filter cartridge (20) is connected to the inner cavity of the inner ring portion (52) through the first drain hole (522), and the outer space of the filter cartridge (20) is connected to the inner cavity of the inner ring portion (52) through the second drain hole (511) and the third drain hole (523).

2. The sewage discharge structure of the pre-filter according to claim 1, characterized in that, The bottom of the filter cylinder (20) is provided with a sealing protrusion ring (2212) and a drain hole (223) communicating with the inner cavity of the filter cylinder (20). The support frame (50) can move axially relative to the filter cylinder (20) between the filtration position and the drain position. When the support frame (50) is in the drain position, the first drain hole (522) coincides with and connects with the drain hole (223), and the second drain hole (511) is open; when the support frame (50) is in the filter position, the first drain hole (522) is offset from and cut off from the drain hole (223), and the sealing ring (2212) blocks the second drain hole (511).

3. The sewage discharge structure of the pre-filter according to claim 2, characterized in that, The drain hole (223) is arranged to gradually slope downward from the outside to the inside along the radial direction of the filter cylinder (20).

4. The sewage discharge structure of the pre-filter according to claim 2, characterized in that, The inner ring (52) is sealed to the filter cylinder (20) by a fourth sealing ring (53), and the outer ring (51) is sealed to the sealing convex ring (2212) by a sixth sealing ring (55).

5. The sewage discharge structure of the pre-filter according to claim 4, characterized in that, The number of the fourth sealing rings (53) is set to two, and the two fourth sealing rings (53) are located on the upper and lower sides of the first drain hole (522) respectively.

6. The sewage discharge structure of the pre-filter according to claim 2, characterized in that, The filter cartridge (20) includes a filter screen (21) and a support (22). The filter screen (21) is a cylindrical structure with openings at both ends. The support (22) includes an outer ring frame (221) and an inner ring frame (222). The outer ring frame (221) is fitted and sleeved on the outside of the filter screen (21). The inner ring frame (222) is connected to the bottom of the inner side of the outer ring frame (221). The inner ring part (52) is sealed and inserted into the inner ring frame (222). The sealing protrusion (2212) is disposed at the bottom of the outer ring frame (221). The inner bottom surface of the outer ring frame (221) and the inner ring frame (222) together define the drain hole (223).

7. The sewage discharge structure of the pre-filter according to claim 1, characterized in that, The number of the first drain holes (522) is set to be multiple, and the multiple first drain holes (522) are evenly spaced along the circumference of the inner ring portion (52); and / or The number of the second drain holes (511) is set to multiple, and the multiple second drain holes (511) are evenly spaced along the circumference of the outer ring portion (51); and / or The number of the third drain holes (523) is set to multiple, and the multiple third drain holes (523) are evenly spaced along the circumference of the inner ring (52).

8. The sewage discharge structure of the pre-filter according to claim 1, characterized in that, The outer ring (51) is bowl-shaped, and the second drain hole (511) is located at the bottom of the outer ring (51).

9. The sewage discharge structure of the pre-filter according to claim 1, characterized in that, The first drain hole (522) is wider at the outside and narrower at the inside, and / or the second drain hole (511) is wider at the top and narrower at the bottom.

10. A pre-filter, comprising a filter bottle (10) and a drain structure for the pre-filter as described in any one of claims 1-9, characterized in that, The pre-filter's drainage structure is located inside the filter bottle (10). The bottom of the filter bottle (10) is provided with a drainage port (124). The drainage port (124) can be selectively opened or closed. When the drainage port (124) is opened, the inner cavity of the inner ring (52) is connected to the drainage port (124).

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