Pre-filter and water system

Abstract

The utility model discloses a pre-filter and a water consumption system, and relates to the technical field of filters. Wherein the pre-filter comprises a valve head, a filter bottle, a filter assembly and a movable part, the filter assembly is fixedly installed in the water filtering cavity and comprises a filter module, the filter module comprises a supporting framework and a filter part, the supporting framework is provided with a first water passing side located on the axial side and a second water passing side surrounding the supporting framework in the circumferential direction, and the filter part is arranged on the second water passing side; the movable part is movably arranged in the water filtering cavity, so that the pre-filter can be switched between a filtering mode and a flushing mode, the water inlet and the water outlet are formed in one side of the movable part, the drain outlet is formed in the other side of the movable part, and spaces on the two opposite sides of the movable part are separated in the filtering mode and communicated in the flushing mode. The technical scheme provided by the utility model has the technical effects that the filtering effect of the filtering assembly is ensured, and the service life of the pre-filter is prolonged.

Description

Technical Field

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

[0002] As people's living standards continue to improve, their demands for daily water use are also increasing. Due to long-term neglect and aging, tap water pipes often contain large particles harmful to human health, such as sediment, rust, and red worms, seriously affecting residents' drinking water health. Therefore, pre-filters are installed. These pre-filters contain filter components and other structures to filter large particles from tap water before it reaches the faucet. However, while the pre-filter is filtering the water, impurities accumulate inside the filter chamber, especially on the surface of the filter components. Over time, this can clog the filter components, reducing their filtration efficiency. Utility Model Content

[0003] The main purpose of this invention is to provide a pre-filter and water system, which aims to ensure the filtration effect of the filter components and improve the service life of the pre-filter.

[0004] To achieve the above objectives, the pre-filter proposed in this utility model includes:

[0005] A valve head and a filter bottle, wherein the filter bottle forms a water filtration chamber, the valve head is provided with an inlet and an outlet communicating with the water filtration chamber, and the filter bottle is provided with a drain outlet communicating with the water filtration chamber on the side away from the valve head;

[0006] A filter assembly is fixedly installed within the water filtration chamber. The filter assembly includes a filter module, which includes a support frame and a filter element. The support frame has a first water-passing side located on one axial side and a second water-passing side surrounding it in the circumferential direction. The filter element is disposed on the second water-passing side.

[0007] The movable component is movably disposed in the water filtration chamber, allowing the pre-filter to switch between filtration mode and flushing mode. The water inlet and the water outlet are located on one side of the movable component, and the drain outlet is located on the other side of the movable component. The spaces on opposite sides of the movable component are separated in the filtration mode and connected in the flushing mode.

[0008] In one embodiment, the filter element is cylindrical.

[0009] In one embodiment, the support frame is cylindrical, and one side of the support frame is open to form the first water passage side.

[0010] In one embodiment, the filter element is fitted outside the support frame.

[0011] In one embodiment, the support frame includes a main body and an additional part distributed along the axial direction. A sealing ring is fitted at the end of the main body away from the additional part, and a sealing ring is also fitted at the additional part. Each end of the filter element is sealed to the support frame by one of the sealing rings.

[0012] In one embodiment, the filter assembly further includes an end cap, the end cap including a cylindrical portion and a limiting ring portion disposed around the periphery of the cylindrical portion, the limiting ring portion being connected to the side of the support frame away from the valve head, the cylindrical portion being inserted into the filter module, and the movable member being slidably inserted into the cylindrical portion.

[0013] In one embodiment, the valve head and the filter bottle are connected by fasteners.

[0014] In one embodiment, the filter bottle has a first flange protruding from its outer periphery, and the valve head has a second flange protruding from its outer periphery. The first flange and the second flange abut against each other and are connected by fasteners.

[0015] In one embodiment, the movable component is provided with a second flow port. In the rinsing mode, the two ends of the second flow port are respectively connected to the spaces on both sides of the movable component. In the filtration mode, the second flow port is blocked, thereby isolating the spaces on both sides of the movable component.

[0016] In one embodiment, the pre-filter further includes an outer frame and an impeller assembly disposed within the filtration chamber. The outer frame is rotatably fitted over the filter assembly. The impeller assembly includes a mounting base fixedly installed within the filtration chamber and an impeller body rotatably installed within the mounting base. The impeller body is fixedly connected to the outer frame in the circumferential direction. The mounting base has a communicating inlet and a outlet. At least one of the outlet and the inlet is a first flow port. The movable component includes a blocking part, the axial side of which is separably blocked in the first flow port. The second flow port and the first flow port are staggered.

[0017] In one embodiment, a sealing ring surface is provided in the water filtration chamber corresponding to the sealing part, and the outer periphery of the sealing part is sealed and fitted to the sealing ring surface, and can move axially relative to the sealing ring surface.

[0018] In one embodiment, the pre-filter further includes a reversing bottom shell fixedly connected to the mounting base. The reversing bottom shell and the outer frame are located on opposite axial sides of the mounting base. The inner circumferential surface of the reversing bottom shell is the sealing ring surface. The sealing portion extends into the inner side of the reversing bottom shell and is slidably connected to the reversing bottom shell.

[0019] In one embodiment, the outer frame forms a siphon channel, the outer frame includes a chassis and a side frame, the side frame is provided with a siphon hole communicating with the siphon channel, the chassis is provided with a first discharge port communicating with the siphon channel and a second discharge port passing through along the axial direction, and a water-blocking structure is formed on the opposite side of the outer frame and the mounting base, the water-blocking structure is arranged around the first discharge port, and the second discharge port is located on the outer periphery of the water-blocking structure;

[0020] The water inlet includes a first water inlet located on one axial side of the mounting base and a second water inlet located on the periphery of the mounting base. The first discharge outlet is connected to the first water inlet, and the second discharge outlet is connected to the second water inlet.

[0021] In one embodiment, the pre-filter further includes a reversing member, which is tractively connected to the movable member. The reversing member is hollow, and its inner circumferential side is connected to the water outlet and the filter chamber. The reversing member includes a connecting portion and a partition portion. The reversing member is movably inserted into the filter assembly. The flushing flow path between the water inlet and the reversing member is connected through the connecting portion and cut off through the partition portion.

[0022] In one embodiment, the valve head is provided with a water-blocking ring between the water inlet and the water outlet. The water inlet is connected to the outer circumference of the water-blocking ring, and the water outlet is connected to the inner circumference of the water-blocking ring. The connecting portion and the blocking portion are distributed axially, and the reversing member is axially movable and inserted into the water-blocking ring and the filter assembly.

[0023] In one embodiment, the filter assembly includes a water distributor located at one end of the filter assembly near the water-blocking ring. The water-blocking ring and the water distributor together form a water-passing structure, which is connected to the water inlet.

[0024] The reversing component also includes a hollow pipe section. The connecting part, the partition part, and the hollow pipe section are distributed sequentially along the axial direction. The connecting part is inserted into the water-proof ring, the partition part is inserted into the water distributor, and the hollow pipe section extends into the filter module.

[0025] On the adjacent side of the water distributor and the water-blocking ring, the water passage structure is isolated from the connecting part in the filtration mode, and connected to the connecting part in the flushing mode.

[0026] In one embodiment, the water distributor has a first water passage space corresponding to the first water passage side and a second water passage space corresponding to the second water passage side. The water distributor and the water-blocking ring are axially opposite to each other and spaced apart. In the filtration mode, the two axial sides of the baffle portion are respectively connected to the water distributor and the water-blocking ring, and respectively communicate with the inner circumferential sides of the first water passage space and the water-blocking ring, and are spaced apart from the second water passage space. In the flushing mode, the connecting portion is at least partially located between the water distributor and the water-blocking ring, and the baffle portion covers the second water passage space.

[0027] In one embodiment, the commutator is connected to an elastic element, and under the action of the elastic element, the commutator and the movable element can be maintained at positions corresponding to the filtering mode.

[0028] This utility model also proposes a water system, including the aforementioned pre-filter.

[0029] In this invention, the movement of a movable component within the filtration chamber allows the spaces on both sides of the component to switch between a blocked state and a connected state, thus enabling the pre-filter to switch between filtration and flushing modes. In filtration mode, the outlet is open and the drain is closed. Raw water entering through the inlet is filtered by the filter assembly and flows to the outlet. At this time, the movable component is positioned to block the spaces on both sides. In flushing mode, the outlet is closed and the drain is open. Water entering through the inlet flushes the filter assembly within the filtration chamber, cleaning impurities adhering to the filter assembly. Wastewater then flows out through the drain. At this time, the movable component is positioned to connect the spaces on both sides, allowing the inlet and drain to communicate. Therefore, this invention provides a pre-filter with a flushing mode, which periodically cleans impurities adhering to the filter assembly, ensuring the filtration effect and extending the service life of the pre-filter. Furthermore, the movable parts can switch between different positions, which can effectively ensure the performance of the pre-filter in different working modes. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0031] Figure 1 A schematic diagram of the structure of an embodiment of the pre-filter provided by this utility model;

[0032] Figure 2 A schematic diagram of the structure of a valve head of a pre-filter provided by this utility model;

[0033] Figure 3 A cross-sectional structural schematic diagram of an embodiment of the pre-filter provided by this utility model in filtration mode;

[0034] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;

[0035] Figure 5 for Figure 3 A partial structural diagram of another part of the structure;

[0036] Figure 6 A cross-sectional structural schematic diagram of an embodiment of the pre-filter provided by this utility model in flushing mode;

[0037] Figure 7 for Figure 6 A magnified view of a section at point B in the middle;

[0038] Figure 8 for Figure 6 A partial structural diagram of another part of the structure;

[0039] Figure 9 A schematic diagram of the structure of a filter assembly of a pre-filter provided by this utility model;

[0040] Figure 10 A cross-sectional structural schematic diagram of an embodiment of the filter assembly of the pre-filter provided by this utility model;

[0041] Figure 11 A schematic diagram of the structure of a commutator of a pre-filter provided by this utility model;

[0042] Figure 12 A schematic diagram of the structure of an embodiment of the movable component of the pre-filter provided by this utility model;

[0043] Figure 13 for Figure 12 A structural schematic diagram of the moving parts from another perspective;

[0044] Figure 14 A schematic diagram of the structure of an embodiment of the outer frame of the pre-filter provided by this utility model;

[0045] Figure 15 A schematic diagram of the structure of an embodiment of the impeller assembly of the pre-filter provided by this utility model;

[0046] Figure 16 for Figure 15A schematic diagram of the impeller assembly from another perspective;

[0047] Figure 17 for Figure 15 A schematic diagram of the impeller body of the impeller assembly in one embodiment.

[0048] Explanation of icon numbers:

[0049] 10. Filter bottle; 101. Filter chamber; 102. Drain outlet; 104. First flow port; 110. First flange;

[0050] 20. Valve head; 21. Metal outer shell; 22. Plastic inner liner; 201. Inlet; 202. Outlet; 210. Water-proof ring; 220. Second flange;

[0051] 30. Filter assembly; 300. Filter module; 301. First water passage side; 302. Second water passage side;

[0052] 310. Supporting frame; 311. Main body; 312. Additional parts

[0053] 320. Filter components;

[0054] 360. End cap; 361. Cylindrical part; 362. Limiting ring part;

[0055] 40. Impeller assembly; 410. Mounting base; 402. First water inlet; 403. Second water inlet; 404. Drain outlet; 424. Water baffle ring;

[0056] 440. Impeller body; 441. Impeller shaft; 442. Impeller blades; 443. Second protrusion;

[0057] 50. External frame; 501. Siphon channel; 503. First discharge port; 504. Second discharge port;

[0058] 511. Chassis; 512. Side frame; 513. First protrusion; 514. Water baffle ring; 531. Siphon hole;

[0059] 60. Water distributor; 610. First water passage space; 620. Second water passage space;

[0060] 710. Reversing base; 711. Sealing ring surface;

[0061] 720. Reversing component; 721. Connecting part; 722. Partition; 7221. Annular main body; 7222. Partition skirt; 723. Hollow tube section;

[0062] 730. Moving part; 731. Sealing part; 7311. Second flow port; 732. Connecting part;

[0063] 1001. Fasteners; 1002. Sealing rings; 1003. Elastic components.

[0064] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0065] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0066] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0067] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0068] Water systems, such as whole-house water purification systems, typically include pre-filters. These pre-filters remove large particles from tap water, ensuring water safety, extending the lifespan of appliances, preventing pipe blockages, and improving residents' health. The pre-filter is the first coarse filtration stage in a whole-house water purification system; it's a physical filtration device used to protect downstream water supply.

[0069] This invention proposes a pre-filter with a filtration mode and a flushing mode. In the filtration mode, the pre-filter can filter large particles before the water is used. In the flushing mode, the pre-filter can clean its internal filter components to discharge the previously intercepted large particles, thus eliminating the need for manual disassembly and cleaning of the pre-filter and extending its service life.

[0070] Please see Figures 1 to 3 In one embodiment of the present invention, the pre-filter includes a valve head 20 and a filter bottle 10. The filter bottle 10 forms a water filtration chamber 101. The valve head 20 is provided with an inlet 201 and an outlet 202 communicating with the water filtration chamber 101. The filter bottle 10 is provided with a drain outlet 102 on the side away from the valve head 20.

[0071] The inlet 201 is connected to the water supply end of the water system, and the outlet 202 is connected to the water consumption end of the water system, thereby filtering the raw water flowing from the water supply end to the water consumption end. It should be noted that the water supply end can be a tap water pipe, a water tower, or well water, and the water consumption end can be a faucet, a shower head, or a drinking water outlet; this application does not make any specific limitations on these.

[0072] The valve head 20 and the filter bottle 10 can be connected by a threaded connection. For example, the valve head 20 has an external threaded tube protruding from it, and the bottle mouth of the filter bottle 10 has an internal thread for screwing the external threaded tube. In order to reduce the production difficulty of the pre-filter and the inspection requirements of the assembly results, as well as to reduce the material cost of the valve head 20, in this embodiment, the filter bottle 10 and the valve head 20 are connected by a fastener 1001.

[0073] Specifically, the filter bottle 10 has a first flange 110 protruding from its outer periphery, and the valve head 20 has a second flange 220 protruding from its outer periphery. The first flange 110 and the second flange 220 abut against each other and are connected by a fastener 1001. It can be understood that both the first flange 110 and the second flange 220 have through holes for the fastener 1001 to pass through. The fastener 1001 can be a bolt, with the threaded engagement between the bolt and the through hole locking the first flange 110 and the second flange 220; the fastener 1001 can also be an assembly of a bolt and a nut, with the bolt passing through the through hole and being locked to the nut; the fastener 1001 can also be an assembly of a pin and a pin shaft, with the pin passing through the through hole and the pin shaft passing through the pin, thus locking the first flange 110 and the second flange 220.

[0074] The valve head 20 includes a connected metal outer shell 21 and a plastic inner liner 22. Both the inlet 201 and outlet 202 are formed in the plastic inner liner 22. A second flange 220 is formed in the metal outer shell 21. Thus, the water flowing through the pre-filter directly contacts the plastic inner liner 22, not the metal outer shell 21. This avoids water contamination by metal elements leached from the metal outer shell 21 and also provides the pre-filter with good aesthetics and shell strength. In other embodiments, the valve head 20 can also be directly configured as a metal component.

[0075] The materials of the metal outer shell 21 and the plastic inner liner 22 are not specifically limited in this application. For example, the material of the metal outer shell 21 can be a copper alloy, such as brass, and the material of the plastic inner liner 22 can be PP (polypropylene) or PVC (polyvinyl chloride).

[0076] The pre-filter also includes a filter assembly 30 housed within the filtration chamber 101. Raw water (such as tap water or well water) flows into the inlet 201 from an external water source and passes through the filter assembly 30 for filtration. This filter assembly 30 can intercept large particles of impurities in the water and remove sediment, rust, sand, bacteria, and other particulate impurities generated in the pipes. It provides good protection for water purifiers, washing machines, showerheads, high-end faucets, and downstream pipes, reducing the risk of damage to these devices due to clogging. The form and structure of the filter assembly 30 are not limited; it can be equipped with a stainless steel filter screen or a PP cotton filter screen to filter impurities.

[0077] The pre-filter is typically a "T" shaped structure. The horizontal line at the top corresponds to the valve head 20, with the inlet 201 and outlet 202 at the left and right ends, respectively. The vertical line at the bottom is the filter bottle 10, and the drain outlet 102 is located on the lower side of the filter bottle 10.

[0078] In one embodiment, please refer to the following: Figure 9 and Figure 10The filter assembly 30 includes a filter module 310, which includes a support frame 311 and a filter element 312. The support frame 311 has a first water-passing side 301 located on one axial side and a second water-passing side 302 surrounding it in the circumferential direction. The filter element 312 is disposed on the second water-passing side 302. It can be understood that when water flows through the filter module 310, it will flow into one of the first water-passing side 301 and the second water-passing side 302, and then flow out from the other of the first water-passing side 301 and the second water-passing side 302. That is, the water will pass through the filter element 312, thereby being filtered by the filter element 312. Impurities are intercepted by the filter element 312, and the filtered water will flow to the user's water outlet through the outlet 202. Without loss of generality, when the front filter is in filtration mode, the inlet 201, the second water passage side 302, the first water passage side 301 and the outlet 202 will be distributed sequentially upstream and downstream. That is, the raw water entering from the inlet 201 will first flow into the inner periphery of the filter module 310 through the second water passage side 302, thereby being filtered by the filter element 312, and then flow out of the filter module 310 from the first water passage side 301 and flow to the outlet 202.

[0079] Specifically, the filter element 312 has a cylindrical structure, and the supporting frame 311 has a corresponding cylindrical structure. One side of the supporting frame 311 is open to form the first water-passing side 301. Thus, the structure of the supporting frame 311 and the filter element 312 is simple, facilitating the processing and forming of the filter element 312 and the supporting frame, and allowing for easy installation of the filter assembly 30 within the water filtration chamber 101. Furthermore, both the supporting frame 311 and the filter element 312 are circumferentially continuous structures, ensuring structural strength and improving the filter assembly 30's resistance to water flow impact, thereby extending its service life. Of course, the filter element 312 and the supporting frame 311 can also have other structural forms, such as a conical structure.

[0080] Optionally, the support frame 311 can be made of plastic. Firstly, plastic is less expensive than other materials such as metal, helping to reduce the manufacturing cost of the filter module 310. Secondly, plastic has good corrosion resistance to various chemicals, allowing for long-term use in various corrosive environments, reducing the frequency of damage and replacement of the filter module 310 due to corrosion. Thirdly, the low density of plastic reduces the overall weight of the support frame 311, facilitating installation, transportation, and maintenance. Fourthly, plastic has good processing properties, allowing for the fabrication of filter frames of various shapes and sizes through injection molding, extrusion, and other processes, facilitating the processing and shaping of the support frame 311. Of course, this invention is not limited to this; in other embodiments, the support frame 311 can also be made of metal.

[0081] Optionally, the filter element 312 may be made of metal. Metal materials are durable and stable, which can improve the service life of the filter element 312, thereby enabling it to effectively filter water flow for a longer period of time and reducing replacement frequency and cost. Of course, this invention is not limited to this; in other embodiments, the filter element 312 may also be made of plastic.

[0082] In this embodiment, the filter element 312 is configured as a metal filter mesh. The metal filter mesh has a robust structure and can withstand certain pressure and impact, ensuring safety during use. Furthermore, the metal filter mesh can be customized according to user needs, such as customizing non-standard sized equipment, to meet the usage requirements under different support frames 311. Moreover, the metal filter mesh is washable and easy to clean. Of course, this invention is not limited to this; in other embodiments, the filter element 312 can also be configured as a filter membrane.

[0083] Optionally, the filter element 312 and the support frame 311 are integrally injection molded. It should be noted that the filter element 312 is a metal part, while the support frame 311 is made of plastic. During production, the filter element 312 is first installed in the mold, and then the support frame 311 is formed through injection molding. In this way, the filter element 312 is welded to the surface of the plastic support frame 311 by the high temperature inside the mold, thus making the filter element 312 and the support frame 311 integrally injection molded. Directly combining the filter element 312 with the plastic support frame 311 during injection molding avoids secondary processing steps such as hot melting, welding, and riveting, thereby shortening assembly time and reducing production costs. Furthermore, embedding the filter element 312 into the support frame 311 can improve the installation strength of the filter element 312, enabling it to withstand greater loads and impacts.

[0084] In this embodiment, the filter element 320 is fitted over the support frame 310. That is, after the support frame 310 and the filter element 320 are separately formed, they are assembled into one unit by fitting the filter element 320 over the support frame 310. This ensures the connection stability between the two and the structural stability of the filter assembly. Both ends of the filter element 320 are sealed to the support frame 310 to prevent water from flowing out from the end face joints of the filter element 320 and the support frame 310, thus preventing unfiltered water and filtered water from interpenetrating and affecting the filtration effect of the pre-filter.

[0085] Specifically, the support frame 310 includes a main body 311 and an auxiliary part 312 distributed along the axial direction. A sealing ring is fitted onto the end of the main body 311 away from the auxiliary part 312, and a sealing ring is also fitted onto the auxiliary part 312. Each end of the filter element 320 is sealed to the support frame 310 by one of the sealing rings. Thus, the inner and outer circumferences of the sealing rings abut against the support frame 310 and the filter element 320 respectively, ensuring that both ends of the filter element 320 are sealed to the support frame 310, thereby guaranteeing the filtration effect of the pre-filter. During assembly, the side of the main body 311 away from the sealing ring can be inserted into the filter element 320 first until the other side of the support element is aligned with the filter element 320. Then, the auxiliary part 312 is inserted into the filter element 320. In this way, during the assembly process of the support frame 310 and the filter element 320, the filter element 320 will not be subjected to resistance from the sealing rings throughout the process, allowing for a more effortless and convenient assembly of the support frame 310 and the filter element 320. Of course, in other embodiments, the end of the filter element 320 and the support frame 310 can also be bonded together with waterproof adhesive.

[0086] In one embodiment, please refer to the following: Figure 5 and Figure 8 The pre-filter also includes a movable component 730, which is movably disposed in the filtration chamber 101, allowing the pre-filter to switch between filtration mode and flushing mode. The inlet 201 and the outlet 202 are located on one side of the movable component 730, and the drain outlet 102 is located on the other side of the movable component 730. The spaces on opposite sides of the movable component 730 are separated in the filtration mode and connected in the flushing mode.

[0087] In this utility model, the movable part 730 moves within the water filtration chamber 101, causing the spaces on both sides of the movable part 730 to switch between a blocked state and a connected state, thereby enabling the pre-filter to switch between filtration mode and flushing mode.

[0088] In filtration mode, outlet 202 is open and drain 102 is closed. Raw water entering from inlet 201 is filtered by filter assembly 30 after entering filter chamber 101 and flows to outlet 202. At this time, movable part 730 is in the position of separating the space on both sides. In flushing mode, outlet 202 is closed and drain 102 is open. Water entering from inlet 201 can flush filter assembly 30 in filter chamber 101. In this mode, impurities attached to filter assembly 30 can be cleaned, and then sewage can flow out through drain 102. At this time, movable part 730 is in the position of connecting the space on both sides, so that inlet 201 and drain 102 can be connected.

[0089] When the pre-filter is in filtration mode, the inlet 201, outlet 202 and filter assembly 30 can be relatively concentrated on the same side of the moving part 730, so that the raw water can be filtered more efficiently through the filter assembly 30.

[0090] Without loss of generality, when the pre-filter switches from filtration mode to flushing mode, that is, when the outlet 202 is closed and the drain outlet 102 is open, a pressure difference will be generated in the space on both sides of the movable member 730. This pressure difference causes the movable member 730 to move, thereby moving to a position that opens the space on both sides of the movable member 730, thus opening the flushing flow path between the inlet 201 and the drain outlet 102. Of course, in other embodiments, the position of the movable member 730 can also be changed by other driving methods, for example, by driving the movable member 730 to move by hand-tightening a screw.

[0091] In this invention, the pre-filter has a flushing mode, which periodically cleans impurities attached to the filter assembly 30, thereby ensuring the filtration effect of the filter assembly 30 and improving the service life of the pre-filter. Furthermore, the movable part 730 can switch between different positions, effectively ensuring the working performance of the pre-filter in different operating modes.

[0092] In one embodiment, please refer to the following: Figure 5 , Figure 8 , Figure 12 and Figure 13 The filter chamber 101 has a first flow port 104 formed inside it. The through direction of the first flow port 104 is parallel to the through direction of the drain port 102. The movable part 730 includes a blocking part 731. The blocking part 731 is axially movable relative to the housing. In the filtration mode, the first flow port 104 is blocked, and in the flushing mode, the first flow port 104 is opened.

[0093] It is understandable that "parallel" means parallel or roughly parallel. Thus, the direction of movement of the sealing part 731 will be parallel to the distribution direction of the inlet 201 and the outlet 102, and the direction of the pressure difference force acting on the sealing part 731 will also be parallel to the direction of movement, enabling more reliable driving of the sealing part 731. Furthermore, the through-flow direction of the first overflow port 104 and the direction of movement of the movable part 730 are correspondingly set to the same direction, which facilitates the layout of various structures within the filter chamber 101 and improves the structural symmetry of the pre-filter, thereby ensuring the water pressure stability of the pre-filter within the filter chamber 101 and ensuring the operational stability of the pre-filter.

[0094] Of course, in other embodiments, the arrangement of the first overflow port 104 and the movement direction of the movable member 730 can also be adapted to other directions. Alternatively, when the through direction of the first overflow port 104 is parallel to the through direction of the drain port 102, the movable member 730 can also be rotatably arranged, and the sealing part 731 is provided with a through hole that is eccentric to the axis of rotation. In this case, the movable member 730 can be driven to rotate so that the through hole is opposite to or offset from the first overflow port 104. When they are opposite, the first overflow port 104 can be opened. When they are offset, the sealing part 731 can block the first overflow port 104.

[0095] Without loss of generality, please refer to this as well. Figure 3 , Figure 5 , Figure 6 and Figure 8 The first overflow port 104 is located between the water inlet 201 and the drain port 102. Specifically, it should be located between the filter assembly 30 and the drain port 102. The sealing part 731 can be located on the side of the first overflow port 104 closer to the filter assembly 30, or it can be located on the side of the first overflow port 104 closer to the drain port 102. Of course, in other embodiments, the drain port 102 can also serve as the first overflow port 104.

[0096] In one implementation, please refer to the following: Figure 3 , Figure 5 , Figure 6 and Figure 8 The filter chamber 101 is provided with a sealing ring surface 711 corresponding to the sealing part 731. The axial direction of the sealing ring surface 711 is parallel to the through direction of the first flow port 104. The outer periphery of the sealing part 731 is sealed and fitted to the sealing ring surface 711 and can move relative to the sealing ring surface 711 along the axial direction. The axial side of the sealing part 731 can be detachably sealed to the first flow port 104. The sealing part 731 is provided with a second flow port 7311. The second flow port 7311 and the first flow port 104 are staggered. In the flushing mode, the two ends of the second flow port 7311 are respectively connected to the spaces on both sides of the axial direction of the sealing part 731.

[0097] That is, when the sealing part 731 blocks the first flow port 104 through the solid structure around the second flow port 7311, the solid structure around the first flow port 104 can block the second flow port 7311, thus isolating the space on both sides of the movable part 730. When the sealing part 731 is removed from the first flow port 104, the space on both axial sides of the first flow port 104 and the second flow port 7311 is connected, so that the water inlet 201 can be connected to the drain port 102 through the first flow port 104 and the second flow port 7311. In addition, during the movement of the movable part 730, the outer periphery of the sealing part 731 always maintains a sealed fit with the sealing ring surface 711. In filtration mode, this helps to ensure the isolation of the space on both sides of the movable part 730, preventing water leakage from the side where the water inlet 201 is located to the side where the drain port 102 is located, thus affecting the filtration process of the pre-filter. Furthermore, the sealing ring surface 711 can provide guidance for the movement of the sealing part 731, so as to ensure that the sealing part 731 switches smoothly between different positions.

[0098] Of course, in other embodiments, the outer periphery of the sealing part 731 and other structures in the water filter chamber 101 may be fitted with a gap, and the sealing part 731 may not have a flow passage structure. When the sealing part 731 leaves the first flow passage 104, the flow passes through the gap between the outer periphery of the sealing part 731 and other structures. The sealing part 731 is provided with a sealing structure corresponding to the first flow passage 104 to ensure the sealing effect and the isolation effect on the two sides of the space.

[0099] Furthermore, please refer to the following: Figure 3 , Figure 5 , Figure 6 and Figure 8 A sealing element is fitted around the outer periphery of the sealing portion 731. The inner and outer peripheries of the sealing element abut against the sealing portion 731 and the sealing ring surface 711, respectively. Generally, the sealing element is configured as a sealing ring 1002. Thus, the sealing portion 731 can achieve a sealing fit with the sealing ring surface 711 on its outer periphery through the sealing ring 1002. The sealing ring 1002 can be filled with an interference fit between the outer periphery of the sealing portion 731 and the sealing ring surface 711, but the interference fit should not be too high to ensure that the sealing portion 731 can move relatively smoothly along the sealing ring surface 711. Alternatively, in other embodiments, the outer periphery of the sealing portion 731 may be formed with an elastic deformation portion, which then seals with the sealing ring surface 711.

[0100] In one embodiment, such as Figure 16As shown, multiple first flow ports 104 are distributed circumferentially along the filter chamber 101. "Multiple" refers to two or more, meaning two or more first flow ports 104 are spaced apart in the circumferential direction. This effectively increases the flow area. The multiple first flow ports 104 should be distributed around the central axis of the filter chamber 101, making the flow area relatively concentrated. That is, a relatively concentrated flow area with a certain coverage can be formed within the filter chamber 101, which helps ensure smooth water flow through the first flow ports 104. Of course, in other embodiments, only one first flow port 104 may be provided. The sealing part 731 seals the end of the first flow port 104, or the sealing part 731 enters the first flow port 104, and the sealing ring 1002 on the outer circumference and the inner circumference of the first flow port 104 seal together to achieve the sealing of the first flow port 104.

[0101] In one embodiment, such as Figure 12 and Figure 13 As shown, multiple second flow ports 7311 are distributed circumferentially around the filter chamber 101. That is, two or more second flow ports 7311 are distributed circumferentially on the sealing portion 731, effectively increasing the flow area. The multiple second flow ports 7311 should be distributed around the center of the sealing portion 731, making the flow area relatively concentrated. This forms a relatively concentrated flow area with a certain coverage on the sealing portion 731, which helps ensure smooth water flow through the second flow ports 7311. Furthermore, the sealing portion 731 does not need to have excessively large second flow ports 7311, thus ensuring the structural strength of the sealing portion 731. Further, the multiple second flow ports 7311 can be evenly distributed around the center of the sealing portion 731 to improve the flow uniformity of the sealing portion 731. Without loss of generality, the two second flow ports 7311 are evenly spaced around the center of the sealing portion 731, that is, the two second flow ports 7311 are distributed opposite each other on both sides of the center of the sealing portion 731 in the same radial direction. Of course, in other embodiments, only one second flow port 7311 may be provided.

[0102] In one embodiment, the first flow port 104 and the second flow port 7311 are offset from each other in the circumferential and / or radial direction of the filter chamber 101. That is, the first flow port 104 and the second flow port 7311 are offset from each other in at least one of the circumferential and radial directions of the filter chamber 101. Thus, when the sealing part 731 blocks the first flow port 104, the second flow port 7311 will not be opposite to the first flow port 104, which can isolate the water inlet 201 and the sewage outlet 102. When the sealing part 731 leaves the first flow port 104, the water inlet 201 and the sewage outlet 102 can be connected through the first flow port 104 and the second flow port 7311. In particular, when the first overflow port 104 and the second overflow port 7311 are staggered in both the circumferential and radial directions, the path of the water flow from the first overflow port 104 to the second overflow port 7311 can be extended, thereby providing a buffering effect and preventing the water flow from being too rapid.

[0103] In one embodiment, multiple first flow ports 104 and second flow ports 7311 are evenly distributed along the circumference of the filter chamber 101, and the multiple first flow ports 104 and multiple second flow ports 7311 are staggered in both the circumferential and radial directions of the filter chamber 101. Specifically, when the blocking part 731 blocks the first flow port 104, the first flow port 104 and the second flow port 7311 are axially misaligned, and the circumferential position of a second flow port 7311 corresponds to that of two adjacent second flow ports 7311. Furthermore, if the flow area of ​​a single first flow port 104 is greater than the flow area of ​​a single second flow port 7311, the number of first flow ports 104 can be adapted to be more than the number of second flow ports 7311, so that the flow capacity of multiple first flow ports 104 and multiple second flow ports 7311 is equivalent, thereby ensuring the smooth flow of water to the sewage outlet 102.

[0104] In one embodiment, please refer to Figure 5 , Figure 8 and Figure 14 The pre-filter also includes an outer frame 50, which is rotatably fitted onto the filter assembly 30. This allows the outer frame 50 to rotate, disturbing the water flow within the filtration chamber 101 and preventing impurities from depositing and adhering to the sidewalls of the filter assembly 30, the outer frame 50, and the filtration chamber 101. This reduces the likelihood of clogging the filter assembly 30 and ensures its filtration efficiency. In this embodiment, the outer frame 50 includes a side frame 512 and a base 511. The base 511 is connected to the side frame 512 on the side furthest from the valve head 20, providing strong structural stability and smooth rotation. Of course, in other embodiments, the outer frame 50 may only include the side frame 512 structure.

[0105] In one embodiment, please refer to Figure 5 , Figure 8 and Figure 14 The outer frame 50 forms a siphon channel 501, the side frame 512 is provided with a siphon hole 531 communicating with the siphon channel 501, and the chassis 511 is provided with a first discharge port 503 communicating with the siphon channel 501. The first discharge port 503 is connected to the drain port 102 at least in the flushing mode. This utility model's technical solution, by providing a siphon channel 501 and a siphon hole 531 on the outer frame 50, allows impurities and particles intercepted by the filter assembly 30 to be drawn into the siphon hole 531 and siphon channel 501 by the siphon effect after being impacted by water flow. These particles are then discharged more efficiently through the first discharge port 503 to the drain port 102. In other words, in the flushing mode, impurities and particles intercepted by the filter assembly 30 can be more effectively and quickly guided to the drain port 102 and ultimately discharged through the drain port 102, thereby improving the flushing effect on the filter chamber 101, especially the filter assembly 30.

[0106] In one embodiment, please refer to Figure 5 , Figure 8 , Figures 15 to 17 The filter chamber 101 is also provided with an impeller assembly 40. The impeller assembly 40 includes a mounting base 410 and an impeller body 440 rotatably mounted on the mounting base 410. The mounting base 410 has a water inlet and a drain outlet 404. The water inlet includes a first water inlet 402. At least in the flushing mode, the first discharge outlet 503 is connected to the sewage outlet 102 via the first water inlet 402 and the drain outlet 404.

[0107] During the flushing phase of the pre-filter, when the drain valve is opened, water flows in through the inlet of the impeller assembly 40. The impeller body 440 rotates under the impact of the water flow. This rotational motion generates a vortex effect, causing the water to be more strongly agitated inside the filter bottle 10. This more effectively removes impurities and dirt adhering to the surface of the filter media. Compared to still water flow, the dynamic cleaning of the impeller assembly 40 significantly improves the efficiency and effectiveness of the flushing. Furthermore, the rotational motion of the impeller body 440 agitates the impurities and dirt inside the filter bottle 10, suspending them in the water. These impurities are then discharged from the filter bottle 10 through the drain valve and drain port 102, preventing them from redepositing on the filter media and ensuring the thoroughness of the flushing process. In addition, by enhancing the flushing effect, the impeller assembly 40 effectively prevents clogging of the filter media, maintains unobstructed water flow, and preserves the filtration efficiency of the pre-filter. This is crucial for maintaining stable water pressure and clean water quality in residential or commercial systems.

[0108] In addition, the impeller assembly 40 is arranged upstream of the drain outlet 102. The impeller assembly 40 generates centrifugal force by rotating, which can make the water flowing out of the drain outlet 102 swirl, thereby improving the drainage effect and flushing efficiency and reducing water waste. The design of the impeller assembly 40 helps to achieve a more environmentally friendly and energy-saving filtration system.

[0109] By incorporating an impeller assembly 40 into the sewage system and utilizing water flow power to drive the impeller body 440 to rotate, not only can the flushing force and agitation effect of the water flow be enhanced, improving sewage discharge efficiency and cleanliness, but the impeller assembly 40 can also be designed to be relatively simple and low-cost, requiring no additional energy consumption, thus helping to reduce overall operating costs and water waste.

[0110] Furthermore, the outer frame 50 is connected to the impeller body 440 in a transmission connection, enabling the impeller body 440 to rotate in the same direction as the outer frame 50 during the rinsing stage and to provide additional rotational driving force to the outer frame 50.

[0111] There are various structural forms for achieving the transmission connection between the outer frame 50 and the impeller body 440. For example, the impeller body 440 and the outer frame 50 are coaxially connected and fixed in the circumferential direction; that is, the rotation axes of the impeller body 440 and the outer frame 50 are kept fixed in the circumferential direction. For details, please refer to [further details]. Figure 14 and Figure 15 The outer frame 50 may have multiple first protrusions 513 distributed circumferentially on the side facing the mounting base 410, and the impeller shaft 441 may have multiple second protrusions 443 at the end near the outer frame 50. These second protrusions 443 are distributed circumferentially along the impeller shaft 441, with one first protrusion 513 engaged between two adjacent second protrusions 443. Without loss of generality, the connecting portion 732 of the movable member 730 passes through the mounting base 410, the impeller body 440, and the outer frame 50, with the first protrusions 513 and second protrusions 443 engaging on the outer periphery of the movable member 730. In this way, the rotation of the outer frame 50 and the impeller body 440 can mutually promote each other, ensuring the turbulence effect of the outer frame 50 and the impeller body 440, thereby preventing impurity deposition.

[0112] It is worth mentioning that the first discharge port 503 is set at an angle, which allows the water to flow at an angle into the mounting base 410, thereby improving the rotation efficiency of the impeller body 440.

[0113] In one embodiment, please refer to Figure 15The inlet further includes a second inlet 403. The first inlet 402 is located on one axial side of the mounting base 410, and the second inlet 403 is located on the periphery of the mounting base 410. Correspondingly, the impeller body 440 includes an impeller shaft 441 and a plurality of impeller blades 442 inclinedly arranged on the impeller shaft 441. The water flow from the first inlet 402 and the second inlet 403 can both cause the impeller blades 442 to drive the impeller shaft 441 to rotate. Thus, by increasing the water flow path and flow rate into the mounting base 410 through the first inlet 402 and the second inlet 403, and by providing multiple inlets, the water flow can form a more complex flow pattern in the impeller cavity, providing sufficient power for the rotation of the impeller body 440.

[0114] Please see Figure 17 Optionally, the impeller body 440 includes an impeller shaft 441 and a plurality of inclined impeller blades 442. One side of the impeller blades 442 is curved into an arc surface, with a portion of the arc surface facing the first water inlet 402 and the other portion facing the second water inlet 403. In this way, the impeller blades 442 can be driven by the combined action of the water flow from the second water inlet 403 on the side and the first water inlet 402 on the top, which in turn drives the impeller shaft 441 to rotate.

[0115] Wastewater enters the impeller chamber through the first inlet 402 and the second inlet 403, interacting with the rotating impeller body 440 to generate rotational force and agitation, which helps to flush out residual impurities within the filter assembly 30. The rotating impeller body 440 not only enhances the rotational force and agitation of the water flow but also, through its specific impeller blade design 442, guides the water flow to the drain outlet 102, improving drainage efficiency and cleanliness. The drain outlet 404 is located at the bottom or side of the mounting base 410 (usually opposite the drain outlet 102) to facilitate wastewater discharge.

[0116] In one embodiment, please refer to Figure 14 The chassis 511 is also provided with a second discharge port 504 that runs through the axis. The outer frame 50 and the mounting base 410 form a water-blocking structure on opposite sides. The water-blocking structure is arranged around the first discharge port 503. The second discharge port 504 is located on the outer periphery of the water-blocking structure and is used to communicate with the second water inlet 403.

[0117] For details, please refer to the following: Figure 8 , Figure 14 and Figure 15The bottom of the outer frame 50 is provided with a water-blocking ring 514, and the mounting base 410 is provided with a water-blocking ring 424. The water-blocking ring 514 and the water-blocking ring 424 cooperate to form a water-blocking structure. The siphon channel 501 and the first inlet 402 are connected within the inner circumference of the water-blocking structure. The filter chamber 101 on the outer circumference of the filter assembly 30 is connected to the second inlet 403 on the outer circumference of the water-blocking structure through the second discharge port 504. Furthermore, the mounting base 410 is provided with second inlets 403 on both opposite sides. Water in the filter bottle 10, except for the siphon channel 501, can enter through these two second inlets 403 during sewage discharge. The mounting base 410 is designed with four first inlets 402 that are inclined in the same direction. Water flowing out of the siphon channel 501 enters the impeller cavity through the first inlets 402.

[0118] In one embodiment, the sealing part 731 is located on the side of the outer frame 50 away from the valve head 20, and the sealing part 731 can detachably seal at least one of the water inlet and the drain outlet 404; in the filtration mode, the sealing part 731 seals at least one of the water inlet and the drain outlet 404; in the flushing mode, both the water inlet and the drain outlet 404 are open.

[0119] It is understood that at least one of the drain outlet 404 and the inlet is the first overflow outlet 104. The sealing part 731 can be located inside the mounting base 410. In this case, during flushing mode, the water flowing into the mounting base 410 from the inlet will first pass through the second overflow outlet 7311 on the sealing part 731, and then flow out of the mounting base 410 through the drain outlet 404. The mounting base 410 can also be located outside the mounting base 410. In this case, the second overflow outlet 7311 can be located upstream of the inlet or downstream of the drain outlet 404. Furthermore, the sealing part 731 can be provided corresponding to one of the inlet and drain outlet 404, allowing for the separate sealing of one of the inlet and drain outlet 404. Alternatively, it can simultaneously seal both the inlet and drain outlet 404 and be movable relative to the mounting base 410 to a position where both the inlet and drain outlet 404 are simultaneously open.

[0120] When the sealing part 731 blocks the first flow port 104 through the solid structure around the second flow port 7311, the solid structure on the mounting base 410 around the first flow port 104 can block the second flow port 7311, thus isolating the space on both sides of the sealing part 731 axially. When the sealing part 731 is removed from the first flow port 104, the space on both sides of the first flow port 104 and the second flow port 7311 axially is connected, so that the water inlet 201 can be connected to the sewage outlet 102 through the first flow port 104 and the second flow port 7311.

[0121] In flushing mode, both the inlet and outlet 404 on the mounting base 410 are open, allowing water in the filter chamber 101 to enter the mounting base 410, thereby driving the impeller body 440 to rotate. Since the outer frame 50 and the impeller body 440 are fixedly connected in the circumferential direction, this provides driving force for the rotation of the outer frame 50. The rotation of the outer frame 50 can disturb the water flow in the filter chamber 101, preventing impurities from depositing and adhering to the side walls of the filter assembly 30, the outer frame 50, and the filter chamber 101, reducing the possibility of clogging of the filter assembly 30, and thus ensuring the filtration effect of the filter assembly 30.

[0122] In one embodiment, please refer to the following: Figure 5 and Figure 8 The pre-filter also includes a reversing bottom shell 710, with the sealing part 731 extending into the inner side of the reversing bottom shell 710 and slidably connected to it. It is understood that the reversing bottom shell 710 has outlets on both axial sides, which do not interfere with the fit between the sealing part 731 and the first overflow port 104, nor with the communication between the second overflow port 7311 and the drain port 102. In this embodiment, the sliding fit between the reversing bottom shell 710 and the sealing part 731 provides guidance for the axial movement of the moving part 730. Specifically, the outer periphery of the sealing part 731 slidably fits into the inner periphery of the reversing bottom shell 710.

[0123] Without loss of generality, the reversing base 710 is fixedly connected to the mounting base 410, and the reversing base 710 and the filter assembly 30 are respectively located on both axial sides of the mounting base 410. Specifically, the reversing base 710 can be connected to the mounting base 410 by means of snap-fit ​​or screw connection. Without loss of generality, for the two axially distributed sides of the reversing base 710, one side is fixedly connected to the mounting base 410, and the other side abuts against the filter bottle 10, so as to improve the installation stability of the reversing base 710 in the filter bottle 10, thereby improving the guiding effect on the sealing part 731 and ensuring the sealing fit with the sealing part 731. Furthermore, the outer periphery of the reversing base 710 and the inner periphery of the filter bottle 10 are sealed together by a sealing ring 1002, thereby preventing water leakage at the joint between the reversing base 710 and the filter bottle 10, so as to ensure the sealing effect of the sealing part 731. Of course, in other embodiments, the reversing bottom shell 710 may also be mounted on the filter bottle 10.

[0124] Without loss of generality, the inner circumferential surface of the reversing bottom shell 710 is the sealing ring surface 711, and the blocking part 731 is slidably sealed to the inner circumferential surface of the reversing bottom shell 710. In this embodiment, a sealing fit can be achieved through the inner circumferential surface of the reversing bottom shell 710 and the outer circumferential side of the blocking part 731, and the inner circumference of the reversing bottom shell 710 can provide guidance for the movement of the blocking part 731 to ensure smooth switching of the blocking part 731 between different positions. Of course, in other embodiments, the sealing ring surface 711 can also be formed by the filter bottle 10, and the sealing ring surface 711 on the filter assembly 30 and the filter bottle 10 can be slidably sealed to each other. Alternatively, the first flow port 104 that cooperates with the blocking part 731 can also be formed by the reversing bottom shell 710.

[0125] In one embodiment, please refer to the following: Figure 3 , Figure 4 , Figure 6 , Figure 7 and Figure 11 The pre-filter also includes a reversing component 720, which is hollow. The inner circumference of the reversing component 720 is connected to the outlet 202 and the filter chamber 101. The reversing component 720 includes a connecting portion 721 and a baffle portion 722. The reversing component 720 is movably inserted into the filter assembly 30, so that the pre-filter can switch between the filtration mode and the flushing mode. The flushing flow path between the inlet 201 and the reversing component 720 is connected through the connecting portion 721 and cut off through the baffle portion 722.

[0126] In this utility model's technical solution, the pre-filter is a backwashing filter. In both the flushing and filtration modes, the water flow through the filter assembly 30 is reversed, and this flow direction is switched via a reversing member 720. This solution can change the connection between different structures through the movement of the reversing member 720, thereby changing the flow direction of the raw water entering the inlet 201 and the water flow path within the filter chamber 101. This allows the pre-filter to switch between filtration and flushing modes, enabling self-flushing of the internal filter assembly 30 without manual disassembly and cleaning, facilitating pre-filter cleaning and extending its service life. The connecting part 721 and the partition part 722 are integrally formed on the reversing member 720, facilitating assembly, ensuring overall strength, and preventing installation gaps between the connecting part 721 and the partition part 722, which could lead to accidental water leakage and turbulent water flow.

[0127] In one embodiment, please refer to the following: Figures 2 to 4The valve head 20 is provided with a water-isolating ring 210 between the water inlet 201 and the water outlet 202. The water inlet 201 is connected to the outer periphery of the water-isolating ring 210, and the water outlet 202 is connected to the inner periphery of the water-isolating ring 210. The reversing member 720 is axially movable and inserted into the water-isolating ring 210 and the filter assembly 30. It can be understood that the water-isolating ring 210 and the filter assembly 30 are arranged opposite each other along the axial direction. One end of the reversing member 720 is inserted into the water-isolating ring 210. Specifically, the reversing member 720 can be sleeved outside the water-isolating ring 210 or the water-isolating ring 210 can be sleeved outside the reversing member 720. The other end of the reversing member 720 is inserted into the inner periphery of the filter assembly 300. Specifically, the reversing member 720 extends into the filter module 300 through the first water passage 610. Thus, the reversing component 720 can stably switch between different positions corresponding to the filtration mode and the flushing mode, under the constraints of the water-proof ring 210 and the filter assembly 30. Without loss of generality, the water-proof ring 210 and the plastic liner 22 of the valve head 20 are integrally formed. Of course, in other embodiments, the reversing component 720 or other components may have corresponding water-proof structures formed on them, cooperating with the valve head 20 to perform the function of the water-proof ring 210 in this embodiment.

[0128] Please refer to the following: Figure 3 and Figure 4 When the reversing member 720 is driven to the position corresponding to the filtration mode, the position of the baffle 722 can avoid the filtration flow path between the inlet 201 and the second water passage 620, and cut off the flushing flow path between the inlet 201 and the inner circumference of the reversing member 720, so that the filtration flow path from the inlet 201 to the filter chamber 101 through the second water passage 620 is open. At this time, since the drain outlet 102 is closed and the outlet 202 is open, the raw water enters from the inlet 201 and can directly flow through the second water passage 620 to the filter assembly 30 for filtration, and flows radially from the outside to the inside of the filter assembly 30, thereby filtering the raw water. The filtered water then flows through the inner circumference of the reversing member 720 to the outlet 202.

[0129] Please refer to the following: Figure 6 and Figure 7When the reversing member 720 is driven to the position corresponding to the flushing mode, the position of the baffle 722 can isolate the inlet 201 and the second water passage 620, so as to isolate the filtration flow path between the inlet 201 and the filter chamber 101. The position of the connecting part 721 can allow the inlet 201 to connect to the inner circumference of the reversing member 720, so as to guide the flushing flow path from the inlet 201 to the filter chamber 101 through the inner circumference of the reversing member 720. At this time, since the drain port 102 is open and the outlet 202 is closed, the raw water enters from the inlet 201, enters the inner circumference of the reversing member 720 through the connecting part 721, and then flows to the filter assembly 30 to flush the filter assembly 30, and finally is discharged from the drain port 102.

[0130] The connecting part 721 and the partition part 722 are integrally formed in the commutator 720, which not only facilitates the assembly of the commutator 720, but also ensures the overall strength of the commutator 720. It also avoids the possibility of accidental water leakage and water flow disturbance caused by the installation gap between the connecting part 721 and the partition part 722.

[0131] In one embodiment, the water-blocking ring 210 and the water distributor 60 together form a water-passing structure, which is connected to the water inlet 201; on the adjacent side of the water distributor 60 and the water-blocking ring 210, the water-passing structure is separated from the connecting part 721 in the filtration mode, and is connected to the connecting part 721 in the flushing mode.

[0132] In this embodiment, the water-passing structure is jointly constructed by the water-blocking ring 210 and the water distributor 60. The reversing member 720 switches between different positions, which can change the relative position between the baffle part 722 and the connecting part 721 and the water-passing structure, thereby controlling the opening and closing of the water-passing structure and the corresponding space, so that the corresponding flow path is open and the corresponding flow path is blocked. Of course, in other embodiments, the water-passing structure may be constructed only on the water-blocking ring 210.

[0133] In one embodiment, please refer to the following: Figure 3 , Figure 4 , Figure 6 and Figure 7 The water-proof ring 210 and the water distributor 60 are spaced apart, the water-passing structure is the space between the water-proof ring 210 and the water distributor 60, and the connecting part 721 and the partition part 722 are distributed along the axial direction;

[0134] In the filtration mode, the baffle 722 is located at least between the water-blocking ring 210 and the water distributor 60, so that the water inlet 201 is connected to the second water passage space 620;

[0135] In the flushing mode, the connecting portion 721 is at least partially located between the water-blocking ring 210 and the water distributor 60, so that the connecting portion 721 connects to the water inlet 201, and the baffle portion 722 blocks the second water passage space 620.

[0136] In this embodiment, the water-passing structure is configured as the interval between the water-blocking ring 210 and the water distributor 60. The connecting portion 721 and the partition portion 722 are distributed axially, and the reversing member 720 is axially movable relative to the filter bottle 10. In different modes, the reversing member 720 moves axially, respectively, such that the connecting portion 721 and the partition portion 722 are positioned relative to the interval between the water-blocking ring 210 and the water distributor 60.

[0137] When the partition 722 is spaced between the water-isolating ring 210 and the water distributor 60, the partition 722 is located at least between the water-isolating ring 210 and the water distributor 60. The partition 722 divides the space into two parts, one part is located on the outer periphery of the reversing member 720, and the other part is located on the outer periphery of the reversing member 720. These two parts are not directly connected at this point, but form the following filtration flow path: the raw water flows from the inlet 201 through the second water passage 620 to the filter chamber 101, flows from the outer periphery of the filter assembly 30 to the inner periphery of the filter assembly 30 in the filter chamber 101, and then flows from the outer periphery of the reversing member 720 to the inner periphery of the reversing member 720, and finally flows to the outlet 202.

[0138] When the connecting part 721 is spaced between the water-proof ring 210 and the water distributor 60, the connecting part 721 is at least partially located between the water-proof ring 210 and the water distributor 60. Thus, at this interval, the outer peripheral side of the reversing member 720 can be connected to the inner peripheral side of the reversing member 720 through the connecting part 721. Since the partition part 722 blocks the second water passage space 620, the raw water flows from the inlet 201 through the connecting part 721 to the inner peripheral side of the reversing member 720. Then, at the position corresponding to the filter assembly 30, it flows from the inner peripheral side of the reversing member 720 through the filter assembly 30 to the water filter chamber 101 on the outer peripheral side of the filter assembly 30, thereby rinsing the filter assembly 30 and finally flowing to the drain outlet 102.

[0139] The direction from the connecting part 721 to the partition part 722 can be from the water-blocking ring 210 to the water distributor 60, or the partition part 722 can include two parts: one that blocks the second water passage space 620 and the other that blocks the gap between the water-blocking ring 210 and the water distributor 60. The two parts are located on opposite sides of the axial direction of the connecting part 721, and the part that blocks the second water passage space 620 is located on the side of the water distributor 60 away from the water-blocking ring 210.

[0140] In other embodiments, the water passage structure can be configured as a through hole. In one embodiment, the water-proof ring 210 and the water distributor 60 are integrally formed, and the water passage structure can be configured to be disposed in the through hole of the water-proof ring 210 and the water distributor 60. In another embodiment, the water-proof ring 210 and the water distributor 60 are separately formed, and the water-proof ring 210 and the water distributor 60 abut against each other and are assembled to form a through hole.

[0141] Furthermore, when the water passage structure is configured as a through hole, the connecting part 721 and the partition part 722 can be distributed circumferentially along the reversing member 720. That is, the connection relationship between different structures is changed by the rotation of the reversing member 720 relative to the water distributor 60 and the water-proof ring 210, so as to realize the switching between the filtration mode and the flushing mode. At this time, in the filtration mode, the through hole and the connecting part 721 are circumferentially misaligned. Of course, the connecting part 721 and the partition part 722 can also be distributed axially along the reversing member 720. That is, the reversing member 720 realizes the switching between the filtration mode and the flushing mode through axial movement. At this time, in the filtration mode, the through hole and the connecting part 721 are axially misaligned.

[0142] In one embodiment, please refer to the following: Figure 3 , Figure 4 , Figure 6 and Figure 7 The water distributor 60 and the water-blocking ring 210 are axially opposite and spaced apart. In the filtration mode, the two axial sides of the baffle portion 722 are respectively connected to the water distributor 60 and the water-blocking ring 210, and respectively communicate with the inner circumference of the first water passage space 610 and the water-blocking ring 210, and are spaced apart from the second water passage space 620. In the flushing mode, the connecting portion 721 is at least partially located between the water distributor 60 and the water-blocking ring 210, and the baffle portion 722 covers the second water passage space 620. Thus, in filtration mode, the inlet 201 and the inner circumferential side of the reversing member 720 can be separated by the partition 722 on the adjacent side of the water distributor 60 and the water-blocking ring 210. The inlet 201 will also be connected to the filter chamber 101 on this side through the second water passage space 620. In flushing mode, the inlet 201 and the inner circumferential side of the reversing member 720 can be connected by the connecting part 721 on the adjacent side of the water distributor 60 and the water-blocking ring 210.

[0143] Specifically, the baffle portion 722 includes an annular main body portion 7221 extending axially along the reversing member 720, and a baffle skirt 7222 surrounding the outer periphery of the annular main body portion 7221. The annular main body portion 7221 is connected to the connecting portion 721 and slidably connected to the water distributor 60. The baffle skirt 7222 is located between the water distributor 60 and the water-blocking ring 210. In the rinsing mode, the baffle skirt 7222 abuts against the water distributor 60 on the outer periphery of the second water passage space 620 to cover the second water passage space 620. In the filtration mode, there is a gap between the baffle skirt 7222 and the water distributor 60, that is, it is spaced apart from the second water passage space 620. The outer periphery of the baffle skirt 7222 and the inner periphery of the filter bottle 10 are fitted with a gap, so that the water inlet 201 can communicate with the second water passage space 620 through the gap.

[0144] In one embodiment, the circumferential ring of the connecting portion 721 is provided with a filter structure. Specifically, the peripheral wall of the connecting portion 721 has a perforated structure that can communicate with the water inlet 201, so that in the flushing mode, raw water flowing into the filter chamber 101 from the water inlet 201 can pass through to pass the raw water into the inner circumference of the filter assembly 30, cleaning the filter assembly 30 from the inside out. However, the raw water may also contain impurities. If it is not filtered, the impurities in the raw water may be filtered and stored in the inner circumference of the filter assembly 30 during the flushing process. When the pre-filter chamber 101 switches from the flushing mode to the filtration mode, the impurities in its inner circumference will flow out of the water outlet 202 along with the filtered raw water, resulting in a poor initial filtration effect. Therefore, the circumferential ring of the connecting portion 721 is also provided with a filter structure, which is often configured as a filter screen. The filter screen is fixed to the inner or outer side of the perforated structure, or integrally formed into the connecting portion 721. The filter screen can be adhered to the connecting portion 721. In other embodiments, the filter structure may also be directly installed on the periphery of the water-proof ring 210 by other fixed structures, so that the raw water flowing out of the inlet 201 flows to the connecting part 721 after being filtered by the filter structure.

[0145] In one embodiment, please refer to the following: Figures 3 to 8 The reversing component 720 also includes a hollow tube section 723. The connecting portion 721, the partition portion 722, and the hollow tube section 723 are distributed sequentially along the axial direction. The connecting portion 721 is inserted into the water-proof ring 210, and the partition portion 722 is inserted into the water distributor 60. The hollow tube section 723 extends into the filter module 300. It can be understood that the axis of the hollow tube section 723 is parallel to or even coincides with the axis of the filter bottle 10. The peripheral wall of the hollow tube section 723 is provided with a through hole connecting to the water filtration chamber 101. In the flushing mode, the water flow entering the reversing component 720 from the connecting portion 721 can be guided to the inner periphery of the filter assembly 30 via the hollow tube section 723.

[0146] In filtration mode, raw water enters the filter chamber 101 through the inlet 201, flows through the second water passage 620 of the distributor 60 to the filter assembly 30, and flows radially from the outside to the inside of the filter assembly 30, thereby filtering the raw water. After the filtered raw water enters the inner circumference of the filter assembly 30, it can enter the hollow pipe section 723, and then flows upward to the outlet 202 under the action of water pressure. In flushing mode, raw water enters the filter chamber 101 through the inlet 201, enters the inner circumference of the reversing member 720 through the connecting part 721, and continues to flow downward to the hollow pipe section 723, and then is sprayed out onto the filter assembly 30, so that the cleaning water flow is sprayed radially from the outside to the inside of the filter assembly 30 to remove impurities on the filter assembly 30, thereby achieving the purpose of flushing the filter assembly 30, and then flows out from the drain outlet 102.

[0147] In one embodiment, please refer to the following: Figure 5 and Figure 8 The connecting part 732 passes through the impeller body 440, with one end fixedly connected to the blocking part 731 and the other end drively connected to the commutator 720. That is, the blocking part 731 is located on the side of the impeller body 440 away from the filter assembly 30, and a through hole is provided on the impeller shaft 441 of the impeller body 440. The connecting part 732 passes through this through hole and is connected to the commutator 720 on the other side of the impeller body 440. Thus, the through hole on the impeller shaft 441 provides guidance for the connecting part 732, ensuring the stable movement of the movable part 730 between different positions. Simultaneously, the connecting part 732 provides support for the impeller body 440, allowing the impeller body 440 to rotate smoothly around the connecting part 732. Alternatively, in other embodiments, the blocking part 731 may be located between the mounting base 410 and the outer frame 50, and the connecting part 732 may pass through the outer frame 50 and connect to the commutator 720.

[0148] Furthermore, in this embodiment, the connecting portion 732 also passes through the mounting base 410. The sealing portion 731 and the outer frame 50 are respectively located on both axial sides of the mounting base 410. The drain outlet 404 is located on the opposite side of the mounting base 410 and the sealing portion 731. The sealing portion 731 is detachably abutted against the side of the mounting base 410 away from the outer frame 50, and can detachably seal the drain outlet 404. That is, both axial sides of the mounting base 410 are provided with through holes. The connecting portion 732 passes through the through hole of the impeller body 440 from the side of the mounting base 410 away from the filter assembly 30, and exits from the side of the mounting base 410 close to the filter assembly 30. Then it passes through the outer frame 50, extends into the filter assembly 30, and connects with the commutator 720. The impeller assembly 40 includes a mounting base 410 and an impeller body 440. The sealing portion 731 is located outside the impeller assembly 40, which simplifies the structure of the mounting base 410 and facilitates the modular design of the impeller assembly 40. Of course, in other embodiments, the sealing portion 731 can also be located inside the mounting base 410, and the connecting portion 732 can be sequentially inserted through the impeller body 440, the shaft side of the mounting base 410 near the outer frame 50, and the outer frame 50. In this case, the sealing ring surface 711 corresponds to the inner circumferential surface of the mounting base 410.

[0149] In one embodiment, please refer to the following: Figure 5 and Figure 8 The movable component 730 is fixedly connected to the reversing component 720. Thus, when the reversing component 720 is driven to move axially, it can simultaneously drive the movable component 730 to move axially, causing the blocking part 731 to move correspondingly within the sewage discharge channel. Of course, in other embodiments, the reversing component 720 and the movable component 730 can also be connected by an intermediate structure. For example, the reversing component 720 and the movable component 730 can be axially movably inserted together, with an elastic element 1003 connecting them, transmitting axial movement through the elastic element 1003.

[0150] Specifically, the reversing component 720 includes a hollow tube section 723, which is fixedly connected to the inner circumference of the filter assembly 30. Specifically, the connecting portion 732 extends into the filter assembly 30 and connects to the hollow tube section 723. The movable component 730 and the reversing component 720 can be connected by threads; that is, one of the hollow tube section 723 and the connecting portion 732 has a threaded hole, and the other has an external thread, and the two are fixedly connected by screwing. Thus, the movable component 730 and the reversing component 720 are separately formed and can be made of different materials to meet the needs of reversing and sealing respectively. Of course, in other embodiments, the reversing component 720 and the sealing portion 731 can also be integrally formed.

[0151] In one embodiment, please refer to the following: Figure 5 , Figure 8 and Figure 10 The filter assembly 30 further includes an end cap 360, which includes a cylindrical portion 361 and a limiting ring portion 362 disposed around the cylindrical portion 361. The limiting ring portion 362 is connected to the side of the filter module 300 opposite to the water distributor 60. The cylindrical portion 361 is inserted into the filter module 300, and the movable member 730 is slidably inserted into the cylindrical portion 361. Specifically, the cylindrical portion 361 is inserted into the inner circumference of the auxiliary portion 312, and the limiting ring portion 362 is limited and abuts against the end face of the auxiliary portion 312. In this way, the cylindrical portion 361 can avoid the movable member 730 and provide a certain guiding effect for the movement of the movable member 730. Of course, in other embodiments, the movable member 730 can also be directly and slidably fitted onto the inner circumferential wall of the auxiliary portion 312.

[0152] Furthermore, the outer periphery of the hollow tube segment 723 and the inner periphery of the cylindrical portion 361 are sealed together. A sealing ring 1002 seals the hollow tube segment 723 into the inner periphery of the cylindrical portion 361. Thus, the cylindrical portion 361 can simultaneously guide the movement of both the hollow tube segment 723 and the moving part 730. Furthermore, due to the sealed fit between the hollow tube segment 723 and the cylindrical portion 361, water will not leak at the connection point. Water flowing within the inner periphery of the filter module 300 and the filter chamber 101 must pass through the second water passage side 302, i.e., through the filter element 320, thereby ensuring the filtration effect of the pre-filter. Alternatively, in other embodiments, the inner periphery of the support frame 310 may directly protrude a corresponding structure that seals with the outer periphery of the hollow tube segment 723.

[0153] For general reference only, please refer to the above as well. Figure 3 , Figure 4 , Figure 6 and Figure 7At least one of the reversing member 720 and the movable member 730 is connected to the elastic member 1003. Under the action of the elastic member 1003, both the reversing member 720 and the movable member 730 can naturally maintain their positions corresponding to the filtration mode. When the pre-filter switches from the filtration mode to the flushing mode, the outlet 202 closes and the drain outlet 102 opens, creating a pressure difference between the inlet 201 and the drain outlet 102. The side of the movable member 730 closest to the inlet 201 will be subjected to pressure, causing the movable member 730 to move towards the drain outlet 102, thereby driving the reversing member 720 to move accordingly. This creates a flushing flow path from the inlet 201 to the drain outlet 102 within the pre-filter, while the elastic member 1003 undergoes elastic deformation. When the pre-filter switches from self-rinsing mode to filtration mode, the drain port 102 closes and the outlet 202 opens. The elastic element 1003 returns to its original shape, thereby causing the reversing element 720 and the movable element 730 to return to the position corresponding to the filtration mode. That is, the movable element 730 returns to the position that separates the two sides of the space. Thereafter, without external force, the movable element 730 can remain stably in its current position, providing a stable working environment for the filtration process of the pre-filter. Of course, in other embodiments, the mode switching of the pre-filter can also be controlled by other driving methods, such as hand-tightening a screw. The user can switch the pre-filter to different modes by turning the screw in different directions.

[0154] It should be noted that, unless otherwise specified, "multiple" as mentioned in this plan should be understood as two or more.

[0155] This utility model also proposes a water system, which includes a pre-filter. The specific structure of the pre-filter is as described in the above embodiments. Since this water system adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The water system includes at least related components from the pre-filter to the water outlet. For example, the water system may include household appliances such as water heaters, dishwashers, and water dispensers, or auxiliary components such as water pipes for domestic water use throughout the house.

[0156] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A pre-filter, characterized in that, include: A valve head and a filter bottle, wherein the filter bottle forms a water filtration chamber, the valve head is provided with an inlet and an outlet communicating with the water filtration chamber, and the filter bottle is provided with a drain outlet communicating with the water filtration chamber on the side away from the valve head; A filter assembly is fixedly installed in the water filtration chamber. The filter assembly includes a filter module, which includes a support frame and a filter element. The support frame has a first water passage side located on one side of the axial direction and a second water passage side surrounding it in the circumferential direction. The filter element is disposed on the second water passage side. as well as The movable component is movably disposed in the water filtration chamber, allowing the pre-filter to switch between filtration mode and flushing mode. The water inlet and the water outlet are located on one side of the movable component, and the drain outlet is located on the other side of the movable component. The spaces on opposite sides of the movable component are separated in the filtration mode and connected in the flushing mode.

2. The pre-filter as described in claim 1, characterized in that, The filter element is cylindrical.

3. The pre-filter as described in claim 2, characterized in that, The supporting frame is cylindrical, and one side of the supporting frame is open to form the first water passage side.

4. The pre-filter as described in claim 1, characterized in that, The filter element is fitted outside the support frame.

5. The pre-filter as described in claim 4, characterized in that, The support frame includes a main body and an additional part distributed along the axial direction. A sealing ring is fitted on the end of the main body away from the additional part, and a sealing ring is also fitted on the additional part. The two ends of the filter element are sealed to the support frame by a sealing ring.

6. The pre-filter as described in claim 1, characterized in that, The filter assembly further includes an end cap, which includes a cylindrical portion and a limiting ring portion disposed around the periphery of the cylindrical portion. The limiting ring portion is connected to the side of the support frame away from the valve head. The cylindrical portion is inserted into the filter module, and the movable component is slidably inserted into the cylindrical portion.

7. The pre-filter as described in claim 1, characterized in that, The valve head and the filter bottle are connected by fasteners.

8. The pre-filter as described in claim 7, characterized in that, The filter bottle has a first flange protruding from its outer periphery, and the valve head has a second flange protruding from its outer periphery. The first flange and the second flange abut against each other and are connected by fasteners.

9. The pre-filter as described in claim 1, characterized in that, The movable component is provided with a second flow port. In the rinsing mode, the two ends of the second flow port are respectively connected to the spaces on both sides of the movable component. In the filtration mode, the second flow port is blocked, so that the spaces on both sides of the movable component are separated.

10. The pre-filter as described in claim 9, characterized in that, The pre-filter further includes an outer frame and an impeller assembly disposed within the filtration chamber. The outer frame is rotatably fitted over the filter assembly. The impeller assembly includes a mounting base fixedly installed within the filtration chamber and an impeller body rotatably installed within the mounting base. The impeller body is fixedly connected to the outer frame in the circumferential direction. The mounting base has a connected inlet and outlet. At least one of the outlet and the inlet is a first flow port. The movable component includes a sealing part. The axial side of the sealing part is separably sealed to the first flow port. The second flow port and the first flow port are staggered.

11. The pre-filter as claimed in claim 10, characterized in that, A sealing ring surface is provided in the water filtration chamber corresponding to the sealing part. The outer periphery of the sealing part is sealed and fitted to the sealing ring surface, and can move axially relative to the sealing ring surface.

12. The pre-filter as described in claim 11, characterized in that, The pre-filter also includes a reversing bottom shell fixedly connected to the mounting base. The reversing bottom shell and the outer frame are located on opposite axial sides of the mounting base. The inner circumferential surface of the reversing bottom shell is the sealing ring surface. The sealing part extends into the inner side of the reversing bottom shell and is slidably connected to the reversing bottom shell.

13. The pre-filter as described in claim 10, characterized in that, The outer frame forms a siphon channel. The outer frame includes a chassis and a side frame. The side frame is provided with a siphon hole that communicates with the siphon channel. The chassis is provided with a first discharge port that communicates with the siphon channel and a second discharge port that passes through along the axial direction. A water-blocking structure is formed on the opposite side of the outer frame and the mounting base. The water-blocking structure is arranged around the first discharge port, and the second discharge port is located on the outer periphery of the water-blocking structure. The water inlet includes a first water inlet located on one axial side of the mounting base and a second water inlet located on the periphery of the mounting base. The first discharge outlet is connected to the first water inlet, and the second discharge outlet is connected to the second water inlet.

14. The pre-filter as claimed in claim 1, characterized in that, The pre-filter also includes a reversing component, which is tractively connected to the movable component. The reversing component is hollow, and its inner circumference is connected to the water outlet and the filter chamber. The reversing component includes a connecting portion and a partition portion. The reversing component is movably inserted into the filter assembly. The flushing flow path between the water inlet and the reversing component is connected through the connecting portion and cut off through the partition portion.

15. The pre-filter as described in claim 14, characterized in that, The valve head is provided with a water-blocking ring between the water inlet and the water outlet. The water inlet is connected to the outer circumference of the water-blocking ring, and the water outlet is connected to the inner circumference of the water-blocking ring. The connecting part and the blocking part are distributed axially. The reversing member is axially movable and inserted into the water-blocking ring and the filter assembly.

16. The pre-filter as described in claim 15, characterized in that, The filter assembly includes a water distributor located at one end of the filter assembly near the water-proof ring. The water-proof ring and the water distributor together form a water-passing structure, which is connected to the water inlet. The reversing component also includes a hollow pipe section. The connecting part, the partition part, and the hollow pipe section are distributed sequentially along the axial direction. The connecting part is inserted into the water-proof ring, the partition part is inserted into the water distributor, and the hollow pipe section extends into the filter module. On the adjacent side of the water distributor and the water-blocking ring, the water passage structure is isolated from the connecting part in the filtration mode, and connected to the connecting part in the flushing mode.

17. The pre-filter as described in claim 16, characterized in that, The water distributor has a first water passage space corresponding to the first water passage side and a second water passage space corresponding to the second water passage side. The water distributor and the water-blocking ring are axially opposite to each other and spaced apart. In the filtration mode, the two axial sides of the baffle are respectively connected to the water distributor and the water-blocking ring, and respectively communicate with the inner circumference of the first water passage space and the water-blocking ring, and are spaced apart from the second water passage space. In the flushing mode, the connecting part is at least partially located between the water distributor and the water-blocking ring, and the baffle covers the second water passage space.

18. The pre-filter as claimed in claim 14, characterized in that, The commutator is connected to an elastic element, and under the action of the elastic element, the commutator and the movable element can be maintained at positions corresponding to the filtering mode.

19. A water supply system, characterized in that, Includes the pre-filter as described in any one of claims 1 to 18.

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