Pre-filter and water system

Abstract

The utility model discloses a pre-filter and a water consuming system, and relates to the technical field of water consuming systems, the pre-filter comprises a shell, a filter assembly and an outer framework, the shell is provided with a water filtering cavity; the filtering assembly is arranged in the water filtering cavity, the outer framework is arranged in the water filtering cavity and rotatably arranged on the periphery of the filtering assembly in a sleeving mode, an inner cleaning brush is installed on the inner side of the outer framework, an outer cleaning brush is arranged on the outer side of the outer framework in a protruding mode, a cleaning part is arranged on the inner cleaning brush, and the cleaning part extends in the axial direction of the outer framework. The filtering assembly is provided with a filtering surface extending in the radial direction of the outer framework, the cleaning part and the filtering surface are correspondingly arranged, the cleaning part is used for cleaning the filtering surface, and the outer cleaning brush is used for cleaning the inner wall of the water filtering cavity. According to the technical scheme provided by the utility model, impurities attached in the water filtering cavity can be conveniently and timely cleaned, and the filtering effect of the pre-filter is ensured.

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 the human body, such as sediment, rust, and red worms, seriously affecting residents' drinking water health. Therefore, installing a pre-filter, which contains filtration components, can filter large particles from tap water before it reaches the faucet.

[0003] However, while the pre-filter is filtering water, impurities will adhere to the filter chamber, such as on the surface of the filter components and the inner wall of the filter chamber. Over time, this will affect the filtration effect of the pre-filter. Utility Model Content

[0004] The main purpose of this invention is to provide a pre-filter and water system, which aims to facilitate timely cleaning of impurities attached to the filter chamber and ensure the filtration effect of the pre-filter.

[0005] To achieve the above objectives, the pre-filter proposed in this utility model includes:

[0006] The casing has a water filter chamber;

[0007] A filter assembly is disposed within the water filtration chamber; and

[0008] An outer frame, disposed within the water filtration chamber, is rotatably fitted around the outer periphery of the filter assembly. An inner cleaning brush is installed on the inner side of the outer frame, and an outer cleaning brush protrudes from the outer side of the outer frame. The inner cleaning brush has a cleaning part that extends axially along the outer frame. The filter assembly has a filter surface that extends radially along the outer frame. The cleaning part is correspondingly disposed to the filter surface. The cleaning part is used to clean the filter surface, and the outer cleaning brush is used to clean the inner wall of the water filtration chamber.

[0009] In one embodiment, the outer frame is further provided with a mounting part, the inner cleaning brush is disposed on the side of the mounting part facing the inner side of the outer frame, and the outer cleaning brush is disposed on the side of the mounting part facing the outer side of the outer frame.

[0010] In one embodiment, the mounting portion is detachably mounted to the outer frame.

[0011] In one embodiment, the mounting part is snapped onto the outer frame.

[0012] In one embodiment, the mounting part is provided with a laterally protruding snap-fit ​​part, the outer frame is provided with a mounting hole, and the inner wall of the mounting hole is provided with a corresponding snap-fit ​​groove. When the mounting part is inserted into the mounting hole, the snap-fit ​​part is inserted into the snap-fit ​​groove.

[0013] In one embodiment, the snap-fit ​​portion has a guide surface on the side facing the inner cleaning brush; and / or,

[0014] The extension direction of the snap-fit ​​groove is set at an angle to the tangent of the outer frame at the mounting hole, and the snap-fit ​​groove is inclined towards the inner side of the outer frame.

[0015] In one embodiment, a recessed groove is provided at one end of the mounting hole facing the outer side of the outer frame, and a limiting stop is provided on the side of the mounting part near the outer cleaning brush. When the mounting part is inserted into the mounting hole, the limiting stop is engaged in the recessed groove.

[0016] In one embodiment, the depth of the groove along the radial direction of the outer frame is greater than or equal to the thickness of the limiting stop; and / or,

[0017] The limiting stop is configured as an arc segment, and the arc segment is parallel to the circumference of the outer frame.

[0018] In one embodiment, the contour of the mounting portion facing the inner cleaning brush is flush with the inner contour of the outer skeleton at the mounting hole.

[0019] In one embodiment, the mounting part, the outer cleaning brush, and the inner cleaning brush are integrally formed.

[0020] In one embodiment, the cleaning section is located at least on the side of the filter assembly where the inner cleaning brushes are distributed axially and parallel to the axial direction of the outer frame.

[0021] In one embodiment, the width of the cleaning section is greater than or equal to 4 mm and less than or equal to 6 mm; and / or,

[0022] The thickness of the cleaning section is greater than or equal to 0.3 mm and less than or equal to 0.7 mm.

[0023] In one embodiment, the cleaning section is gradually expanded in a direction away from the filter assembly; and / or,

[0024] The cleaning section and the filter surface are press-fitted together; and / or

[0025] The interference fit between the cleaning section and the filter surface is 0.2 mm to 0.4 mm.

[0026] In one embodiment, the cleaning part extends obliquely relative to the axial direction of the outer frame in the circumferential direction.

[0027] In one embodiment, multiple cleaning sections and filter surfaces are distributed axially on the outer frame accordingly;

[0028] Furthermore, the plurality of cleaning sections are inclined relative to the axial direction of the outer frame along the same circumference; and / or, adjacent cleaning sections are arranged at an acute angle.

[0029] In one embodiment, the cleaning section and the filter surface are in interference fit; and / or,

[0030] The interference fit between the cleaning section and the filter surface is 0.8 mm to 1.2 mm.

[0031] In one embodiment, the inner cleaning brush further includes a base portion that protrudes from the inner peripheral side of the outer frame, and the cleaning portion is connected to the outer peripheral side of the base portion.

[0032] In one embodiment, the external cleaning brush is clearance-fitted with the inner wall of the filter chamber; and / or,

[0033] The gap between the external cleaning brush and the inner wall of the filter chamber is greater than or equal to 0 mm and less than or equal to 0.3 mm.

[0034] In one embodiment, the end of the external cleaning brush away from the axis of the exoskeleton is pointed; and / or,

[0035] At least a portion of the external cleaning brush is tapered in a direction away from the axis of the exoskeleton.

[0036] In one embodiment, the mounting portion has a receiving groove on the side facing the outer side of the exoskeleton, and the external cleaning brush is mounted in the receiving groove and partially extends out of the receiving groove.

[0037] This utility model also proposes a water system, including a pre-filter as described above.

[0038] The technical solution of this utility model involves setting a water filtration chamber in the shell, with both the filter assembly and the outer frame located inside the water filtration chamber. The outer frame is rotatably fitted around the outer periphery of the filter assembly, and an inner cleaning structure is installed on the inner side of the outer frame. The inner cleaning structure includes an inner cleaning brush, and the inner cleaning brush is provided with a cleaning part. The cleaning part extends axially along the outer frame, that is, the cleaning part is located on the side of the inner cleaning brush. The cleaning part is correspondingly arranged with the filter surface to clean the filter surface, thereby reducing dead corners and increasing the cleaning area of ​​the filter assembly by the inner cleaning structure.

[0039] Furthermore, an external cleaning brush protrudes from the outer side of the outer frame, facing the wall of the filter chamber. This external cleaning brush cleans the inner surface of the filter chamber, reducing impurities adhering to the surface and preventing bacterial growth within the pre-filter, thus ensuring the pre-filter's lifespan. Therefore, when the outer frame rotates within the filter chamber, it simultaneously rotates both the inner and outer cleaning brushes, thereby cleaning both the filter assembly and the inner wall of the filter chamber at the same time, improving the cleaning effect of the pre-filter. Attached Figure Description

[0040] 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.

[0041] Figure 1 A cross-sectional view of the assembly structure of the outer frame and filter components in one embodiment of the pre-filter provided by this utility model;

[0042] Figure 2 for Figure 1 A schematic diagram of the exoskeleton at one angle;

[0043] Figure 3 for Figure 1 Another structural diagram of the exoskeleton;

[0044] Figure 4 for Figure 3 Cross-sectional view of the exoskeleton along AA;

[0045] Figure 5 for Figure 4 A magnified view of a section at point A in the middle;

[0046] Figure 6 for Figure 1 A structural schematic diagram of the mounting section at one angle;

[0047] Figure 7 for Figure 6 A magnified view of a section at point B in the middle;

[0048] Figure 8 for Figure 1 Another structural diagram of the mounting section;

[0049] Figure 9 for Figure 8 A magnified view of a section at point C;

[0050] Figure 10A schematic diagram of the mounting portion at an angle in another embodiment of the pre-filter provided by this utility model;

[0051] Figure 11 for Figure 10 A magnified view of a section at point D;

[0052] Figure 12 for Figure 10 Another structural diagram of the mounting section;

[0053] Figure 13 for Figure 12 A magnified view of a section at point E in the middle;

[0054] Figure 14 A cross-sectional view of the assembly structure of the outer frame and filter components in another embodiment of the pre-filter provided by this utility model;

[0055] Figure 15 for Figure 14 A schematic diagram of the exoskeleton structure;

[0056] Figure 16 for Figure 14 Cross-sectional view of the exoskeleton;

[0057] Figure 17 for Figure 14 A schematic diagram of the internal cleaning brush.

[0058] Explanation of icon numbers:

[0059] 1. Outer frame; 101. Mounting hole; 102. Snap-fit ​​groove; 103. Settling tank; 11. Inner cleaning brush; 111. Cleaning section; 112. Base section; 113. Mounting section; 1131. Snap-fit ​​section; 1132. Guide surface; 114. Outer cleaning brush; 115. Receiving groove; 116. Limiting stop; 2. Filter assembly; 22. Filter surface.

[0060] 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

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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 primarily used to intercept large particles larger than 40 microns, protecting downstream water supply.

[0065] This utility model 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 element 2 to discharge the previously intercepted large particles, thus eliminating the need for manual disassembly and cleaning of the pre-filter and improving its service life.

[0066] Please see Figures 1 to 5 In one embodiment of this utility model, the pre-filter includes a housing with a water filtration chamber. Without loss of generality, the housing includes a valve head and a filter bottle, the filter bottle forming the water filtration chamber, the valve head having an inlet and an outlet communicating with the water filtration chamber, and the filter bottle having a drain outlet on the side away from the valve head.

[0067] The inlet is connected to the water supply end of the water system, and the outlet 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 specific limitations in this regard.

[0068] The valve head and filter bottle can be connected by threads. For example, the valve head has an externally threaded tube, and the filter bottle opening has a corresponding internal thread for screwing the externally threaded tube. To reduce the production difficulty of the pre-filter, the testing requirements for the assembly results, and the material cost of the valve head, in this embodiment, the filter bottle and valve head are connected by fasteners. These fasteners can be bolts, with the bolt and through-hole threadedly engaging to lock the filter bottle and valve head; they can also be a bolt and nut assembly, with the bolt passing through the through-hole and locking to the nut; or they can be a pin and shaft assembly, with the pin passing through the through-hole and the shaft connecting to the pin to lock the filter bottle and valve head.

[0069] The valve head includes a connected metal outer shell and a plastic inner liner, with both the inlet and outlet formed within the plastic inner liner. The metal outer shell and the filter bottle are connected by fasteners. Thus, the water flowing through the pre-filter directly contacts the plastic inner liner, not the metal outer shell, avoiding contamination from metal elements leached from the metal outer shell and ensuring the pre-filter maintains good aesthetics and shell strength. In other embodiments, the valve head can also be directly configured as a metal component.

[0070] This application does not specifically limit the materials of the metal outer shell and the plastic inner liner. For example, the material of the metal outer shell can be a copper alloy, such as brass, and the material of the plastic inner liner can be PP (polypropylene) or PVC (polyvinyl chloride).

[0071] The pre-filter also includes a filter assembly 2 located in the water filtration chamber. The filter assembly 2 has a corresponding filter structure on its filter surface 22. This filter structure can be a stainless steel filter screen or a PP cotton filter screen. After the raw water (such as tap water or well water) flows into the inlet from the external water source, it can flow through the filter assembly 2. When the raw water flows through the filter surface 22, large particulate impurities can be filtered out, thereby removing some sediment, rust, sand, bacteria and other particulate impurities generated in the pipe. This provides better protection for water purifiers, washing machines, shower heads, high-end faucets, downstream pipes, etc., and reduces the risk of these devices being damaged due to impurities clogging them.

[0072] The pre-filter also includes an outer frame 1 and a cleaning structure disposed on the outer frame 1. The outer frame 1 is fitted outside the filter assembly 2. The inner cleaning brush 11 of the cleaning structure protrudes from the inner circumference of the outer frame 1. The outer frame 1 and the filter assembly 2 can rotate relative to each other. Thus, through the relative rotation of the outer frame 1 and the filter assembly 2, the inner cleaning brush 11 can thoroughly clean the circumference of the filter surface 22 to remove impurities attached to the filter surface 22, thereby preventing the filter structure at the filter surface 22 from being blocked, and ensuring the filtration performance and service life of the filter assembly 2. The cleaning part 111 can be an elastic material such as silicone or rubber, or a flexible material such as a brush. Thus, the cleaning part 111 can have a certain degree of deformation capability to improve the adaptability of the cleaning part 111 to the filter surface 22, so that the cleaning part 111 and the filter surface 22 can fit tightly together, and the cleaning part 111 can better clean the filter surface 22 thoroughly.

[0073] This pre-filter typically has a "T" shaped structure. The horizontal line at the top corresponds to the valve head, with the inlet and outlet on the left and right sides, respectively. The vertical line at the bottom is the filter bottle, and the drain outlet is located on the lower side of the filter bottle.

[0074] It is understood that the pre-filter has a filtration mode and a flushing mode. In the filtration mode, both the inlet and outlet are open, and the drain is closed. Raw water flows into the filter chamber from the inlet and then flows through the filter element 2 as it moves towards the outlet, where it is filtered, thus achieving the filtration of the raw water. In the flushing mode, both the inlet and outlet are open, and the outlet is closed. After the raw water flows into the filter chamber from the inlet, it can carry away impurities in the filter chamber. Some of these impurities are swept off the filter element 2 by the internal cleaning brush 11. The wastewater is finally discharged from the drain from the pre-filter, thus achieving the flushing of the pre-filter.

[0075] Without loss of generality, the filter assembly 2 is fixedly installed inside the water filtration chamber, and the outer frame 1 is rotatably installed inside the water filtration chamber. The rotation of the outer frame 1 can disturb the water flow inside the water filtration chamber, prevent impurities from being deposited, and allow the water flow to better carry away impurities and discharge them, thereby ensuring the cleanliness of the pre-filter and ensuring the filtration effect of the pre-filter.

[0076] In an embodiment of this utility model, an inner cleaning structure is installed on the inner side of the outer frame 1, and an outer cleaning brush 114 protrudes from the outer side of the outer frame 1. The inner cleaning structure includes an inner cleaning brush 11, and a cleaning part 111 is provided on the inner cleaning brush 11. The cleaning part 111 extends in the axial direction of the outer frame 1. The cleaning part 111 is correspondingly arranged with the filter surface 22 to clean the filter surface 22. The outer cleaning brush 114 is used to clean the inner wall of the water filtration chamber.

[0077] Specifically, the filter assembly 2 has a radially extending filter surface 22, meaning the filter surface 22 is angled to the axial direction of the filter assembly 2. In the prior art, the cleaning part 111 of the inner cleaning brush 11 is typically located at the end of the inner cleaning brush 11 furthest from the outer frame 1 and protrudes inwards from the outer frame 1. This means the extending direction of the cleaning part 111 is roughly parallel to or at a small angle to the filter surface 22 of the filter assembly 2 in this design. This results in limited cleaning effect of the cleaning part 111 on the filter surface 22, leading to hard-to-reach cleaning dead zones on the surface of the filter assembly 2. Long-term accumulation of impurities not only affects the filtration effect of the filter assembly 2 but also easily causes bacterial growth. Therefore, an inner cleaning brush 11 is provided, with a cleaning part 111 extending axially from the outer frame 1 and corresponding to the filter surface 22. This effectively cleans the filter surface 22, reduces dead zones, and increases the cleaning area of ​​the filter assembly 2 by the inner cleaning structure.

[0078] Furthermore, an external cleaning brush 114 protrudes from the outer side of the outer frame 1, facing the inner wall of the filter chamber. This external cleaning brush 114 cleans the inner surface of the filter chamber, reducing impurities adhering to the surface and preventing bacterial growth within the pre-filter, thus ensuring the service life of the pre-filter. Therefore, when the outer frame 1 rotates within the filter chamber, it can simultaneously rotate both the inner cleaning brush 11 and the outer cleaning brush 114, thereby cleaning both the filter assembly 2 and the inner wall of the filter chamber at the same time, improving the cleaning effect of the pre-filter.

[0079] It should be noted that the filter assembly 2 may have only a radially extending filter surface 22 without an axially extending filter surface 22, or it may have both radially and axially extending filter surfaces 22. Correspondingly, the internal cleaning structure may include only a cleaning portion 111 of the internal cleaning brush 11 located on its axial side, or it may include both a cleaning portion 111 of the internal cleaning brush 11 located on its axial side and a cleaning portion 111 of the internal cleaning brush 11 located at its axial end. The radially extending filter surface 22 of the filter assembly 2 may not be a plane; it may be an inwardly or outwardly concave curved surface, or formed by multiple folds. The filter surface 22 may not be completely parallel to the radial direction of the filter assembly 2 and may have a certain angle with the filter assembly 2.

[0080] The inner cleaning brush 11 can be integrally formed into the outer frame 1, thereby facilitating the assembly of the inner cleaning brush 11. In other embodiments, the inner cleaning brush 11 can also be fastened to the outer frame 1 by snap-fitting, bonding, or fasteners. The outer cleaning brush 114 can be integrally formed into the outer frame 1, thereby facilitating the assembly of the outer cleaning brush 114. In other embodiments, the outer cleaning brush 114 can also be fastened to the outer frame 1 by snap-fitting, bonding, or fasteners.

[0081] In an embodiment of this utility model, an mounting portion 113 is also installed on the outer frame 1. An inner cleaning brush 11 is located on the side of the mounting portion 113 facing inwards from the outer frame 1, and an outer cleaning brush 114 is located on the side of the mounting portion 113 facing outwards from the outer frame 1. Specifically, the mounting portion 113 is used for assembly with the outer frame 1. Both the outer cleaning brush 114 and the inner cleaning brush 11 are located on the mounting portion 113, thereby facilitating the installation of the inner and outer cleaning brushes 114. In other embodiments, the inner cleaning brush 11 and the outer cleaning brush 114 can also be installed on the outer frame 1 using their respective mounting structures; that is, the inner cleaning brush 11 and the outer cleaning brush 114 are independently configured and not connected to each other.

[0082] Furthermore, in the embodiments of this utility model, the mounting part 113, the outer cleaning brush 114, and the inner cleaning brush 11 are integrally formed. Specifically, the mounting part 113, the outer cleaning brush 114, and the inner cleaning brush 11 are integrally formed, which facilitates the installation of the inner cleaning brush 11 and the outer cleaning brush 114, and also ensures the stability of the installation of the inner cleaning brush 11 and the outer cleaning brush 114.

[0083] In other embodiments, the mounting portion 113 and the outer cleaning brush 114 can be integrally formed, thereby facilitating the installation of the plurality of outer cleaning brushes 114 and improving the installation stability of the outer cleaning brushes 114. In other embodiments, the outer cleaning brush 114 and the mounting portion 113 can also be separately formed, such as by bonding, snapping, or fixing the outer cleaning brush 114 to the mounting portion 113 with fasteners. The mounting portion 113 and the inner cleaning brush 11 can be integrally formed, thereby facilitating the installation of the plurality of inner cleaning brushes 11 and improving the installation stability of the inner cleaning brush 11. In other embodiments, the inner cleaning brush 11 and the mounting portion 113 can also be separately formed, such as by bonding, snapping, or fixing the inner cleaning brush 11 to the mounting portion 113 with fasteners. The mounting portion 113 can be separately formed from the outer frame 1, such as by bonding, snapping, or fixing the mounting portion 113 to the outer frame 1, thereby facilitating the overall processing of the outer frame 1 and allowing for the selection of materials for the outer frame 1 and the mounting portion 113. In other embodiments, the mounting part 113 may also be integrally formed with the outer frame 1.

[0084] To facilitate the disassembly of the inner cleaning brush 11 and the outer cleaning brush 114, in this embodiment of the utility model, the mounting part 113 is detachably mounted on the outer frame 1, thereby facilitating the disassembly of the inner cleaning brush 11 and the outer cleaning brush 114. When the inner cleaning brush 11 and / or the outer cleaning brush 114 fail, they can be replaced in time without having to replace the entire outer frame 1, thus facilitating the maintenance of the pre-filter.

[0085] Please refer to it again. Figures 1 to 5In this embodiment of the utility model, the mounting part 113 is snapped onto the outer frame 1, thereby further facilitating the disassembly of the inner cleaning brush 11 and the outer cleaning brush 114, and also facilitating the maintenance of the pre-filter.

[0086] Furthermore, the mounting part 113 is provided with a laterally protruding snap-fit ​​part 1131, and the outer frame 1 is provided with a mounting hole 101. The inner wall of the mounting hole 101 is provided with a corresponding snap-fit ​​groove 102. When the mounting part 113 is inserted into the mounting hole 101, the snap-fit ​​part 1131 is inserted into the snap-fit ​​groove 102. The outer frame 1 is provided with a mounting hole 101, and the mounting part 113 is inserted into the mounting hole 101 from one side, thereby facilitating the installation of the mounting part 113. In this embodiment, the mounting part 113 is inserted into the mounting hole 101 from the outer peripheral side of the outer frame 1 towards its inner peripheral side, which facilitates the processing of the mounting part 113 and reduces the likelihood of the mounting part 113 coming out. In other embodiments, the mounting hole 101 may also be a non-closed hole structure, and the mounting part 113 is inserted into the mounting hole 101 from its non-closed side.

[0087] The mounting part 113 is provided with a laterally protruding snap-fit ​​part 1131, and the inner wall of the mounting hole 101 is provided with a corresponding snap-fit ​​groove 102. When the mounting part 113 is inserted into the mounting hole 101, the snap-fit ​​part 1131 is inserted into the snap-fit ​​groove 102. When the mounting part 113 extends into the mounting hole 101, the edge of the mounting hole 101 presses against the guide surface 1132, causing the snap-fit ​​part 1131 to deflect towards the mounting part 113. As the mounting part 113 is inserted into the snap-fit ​​groove 102, the snap-fit ​​part 1131 springs back into the snap-fit ​​groove 102, thereby snapping the mounting part 113 into the mounting hole 101. This also ensures that when the mounting part 113 is installed in place, the snap-fit ​​part 1131 can be snapped into place, thus facilitating the installation of the mounting part 113 and the mounting hole 101.

[0088] To facilitate the installation of the mounting part 113 and the mounting hole 101, in this embodiment of the invention, the snap-fit ​​part 1131 has a guide surface 1132 on the side facing the inner cleaning brush 11. The extending direction of the snap-fit ​​groove 102 is set at an angle to the tangent of the outer frame 1 at the mounting hole 101, and the snap-fit ​​groove 102 is inclined towards the inner side of the outer frame 1. Specifically, the guide surface 1132 can guide the snap-fit ​​part 1131 to be inserted into the snap-fit ​​groove 102, making it easier for the snap-fit ​​part 1131 to deflect towards the mounting part 113 under the action of the edge of the mounting hole 101. The extending direction of the snap-fit ​​groove 102 is set at an angle to the tangent of the outer frame 1 at the mounting hole 101, and the snap-fit ​​groove 102 is inclined towards the inner side of the outer frame 1, that is, the snap-fit ​​groove 102 is inclined towards the inner side of the outer frame 1, thereby preventing the snap-fit ​​part 1131 from coming out of the snap-fit ​​groove 102 and ensuring the snap-fit ​​stability of the mounting part 113.

[0089] To further limit the installation of the mounting part 113, in this embodiment of the invention, a recessed groove 103 is provided at one end of the mounting hole 101 facing the outer side of the outer frame 1, and a limiting baffle 116 protrudes from the side of the mounting part 113 near the outer cleaning brush 114. When the mounting part 113 is inserted into the mounting hole 101, the limiting baffle 116 engages with the recessed groove 103. Specifically, the recessed groove 103 is provided at one end of the mounting hole 101 facing the outer side of the outer frame 1, and the limiting baffle 116 protrudes from the side of the mounting part 113 near the outer cleaning brush 114, thereby further securing the mounting part 113 into the mounting hole 101 and the limiting baffle 116 into the recessed groove 103, thus limiting the installation of the mounting part 113, controlling the insertion depth of the mounting part 113, and ensuring the installation accuracy of the mounting part 113. Furthermore, the limiting edge 116 extends circumferentially along the outer frame 1, so that the outline of the limiting edge 116 on the side away from the outer frame 1 is approximately parallel to the outer periphery of the outer frame 1, thereby making the limiting edge 116 fit the outer frame 1.

[0090] Furthermore, along the radial direction of the outer frame 1, the depth of the settling groove 103 is greater than or equal to the thickness of the limiting baffle 116; specifically, the depth of the settling groove 103 is greater than or equal to the thickness of the limiting baffle 116, so that the limiting baffle 116 is flush with or recessed into the outer periphery of the outer frame 1, thereby reducing the possibility of collision and friction between the limiting baffle 116 and the inner wall of the filter chamber.

[0091] In another embodiment of this utility model, the limiting stop 116 is configured as an arc segment, and the arc segment is parallel to the circumference of the outer frame 1. Preferably, the limiting stop 116 is configured as an arc segment, and the arc segment is parallel to the circumference of the outer frame 1, so that the contour of the limiting stop 116 on the side away from the outer frame 1 is approximately parallel to the outer periphery of the outer frame 1, thereby reducing the possibility of collision and friction between the limiting stop 116 and the inner wall of the filter chamber.

[0092] In this embodiment of the invention, the contour of the mounting part 113 facing the inner cleaning brush 11 is flush with the inner contour of the outer frame 1 at the mounting hole 101. Specifically, the contour of the mounting part 113 facing the inner cleaning brush 11 is flush with the inner contour of the outer frame 1 at the mounting hole 101, meaning that the mounting part 113 does not protrude from the inner circumference of the outer frame 1, thereby reducing the possibility of collision and friction between the mounting part 113 and the outer frame 1 during rotation. Furthermore, to ensure the stable installation of the mounting part 113, thickened portions are provided at the outer frame 1 and the mounting hole 101 to increase the installation area between the mounting edge and the outer frame 1, ensuring stable installation of both.

[0093] Please see Figure 1 , Figure 2 , Figures 6 to 13In this embodiment of the present invention, the cleaning part 111 is located on the side of the inner cleaning brush 11 distributed along the axial direction of the filter assembly 2, and parallel to the axial direction of the outer frame; that is, the cleaning part 111 is located on the side of the inner cleaning brush 11 and parallel to the axial direction of the filter assembly 2, so that the cleaning part 111 is arranged opposite to the filter surface 22, thereby enabling the cleaning part 111 to directly clean the radially extending filter surface 22 of the filter assembly 2, thereby reducing dead corners and increasing the cleaning area of ​​the filter assembly 2 by the inner cleaning structure.

[0094] In one embodiment, the inner cleaning brush 11 further includes a base portion 112 protruding along a first direction from the inner circumferential side of the outer frame 1, and a cleaning portion 111 disposed on the side of the base portion 112 facing the filter assembly 2. Specifically, the base portion 112 protrudes from the inner circumferential side of the outer frame 1, that is, the base portion 112 extends inward toward the outer frame 1. The base portion 112 can extend radially along the outer frame 1, in which case the first direction is parallel to the radial direction of the outer frame 1. The base portion 112 can also be set at a certain angle to the radial direction of the outer frame 1, which can be configured according to the specific structure of the filter assembly 2. The cleaning portion 111 is disposed on the side of the base portion 112 facing the filter assembly 2, that is, the cleaning portion 111 is only disposed on the axial side of the base portion 112, thereby reducing unnecessary structural redundancy and helping to reduce the structural size of the inner cleaning brush 11, thus facilitating the installation of the inner cleaning brush 11.

[0095] Please see Figures 6 to 13 In this embodiment of the invention, the width of the cleaning part 111 is greater than or equal to 4 mm and less than or equal to 6 mm. Specifically, let the width of the cleaning part 111 be D1. If the width D1 of the cleaning part 111 is greater than 6 mm, the width of the cleaning part 111 along the first direction is too large, which may exceed the width of the filter assembly 2 along the first direction, thus causing unnecessary cost waste. If the width D1 of the cleaning part 111 is less than 4 mm, the width of the cleaning part 111 along the first direction is too small, which may be much smaller than the width of the filter assembly 2 along the first direction, thus causing part of the filter surface 22 of the filter assembly 2 to be unable to be cleaned. Therefore, the width of the cleaning part 111 along the first direction is set to be greater than or equal to 4 mm and less than or equal to 6 mm, so as to ensure the cleaning effect of the cleaning part 111 on the filter assembly 2 and reduce unnecessary cost waste. Preferably, the width of the cleaning section 111 is equal to the width of the filter assembly 2; or the width of the cleaning section 111 is slightly larger or slightly smaller than the width of the filter assembly 2, such as the difference between the width of the cleaning section 111 and the width of the filter assembly 2 being less than or equal to 1 mm. Specifically, the width D1 of the cleaning section 111 along the first direction can be 4 mm, 4.2 mm, 4.5 mm, 4.7 mm, 5 mm, 5.2 mm, 5.5 mm, 5.7 mm, 6 mm, etc.

[0096] Please refer to it again. Figures 6 to 13 In another embodiment of this utility model, the thickness of the cleaning part 111 is greater than or equal to 0.3 mm and less than or equal to 0.7 mm. Specifically, the thickness of the cleaning part 111 is H1, which is the coverage thickness of the cleaning surface on the base part 112. If the thickness of the cleaning part 111 along the circumferential direction of the base part 112 is greater than 0.7 mm, the thickness of the cleaning part 111 is too large, the overall hardness of the cleaning part 111 increases, and the surface of the cleaning part 111 may be damaged when the cleaning part 111 moves relative to the filter assembly 2, or the cleaning part 111 may detach, or the outer frame 1 and the filter assembly 2 may jam, affecting the service life of the pre-filter. If the circumferential thickness of the cleaning part 111 is less than 0.3 mm, the thickness of the cleaning part 111 is too small, the overall hardness of the cleaning part 111 decreases, and the friction between the cleaning part 111 and the filter surface 22 may be insufficient, resulting in inadequate cleaning of the filter surface 22 and affecting the cleaning effect of the pre-filter. Therefore, the thickness of the cleaning section 111 is greater than or equal to 0.3 mm and less than or equal to 0.7 mm, which ensures both the cleaning effect of the filter assembly 2 and the service life of the pre-filter. Specifically, the thickness H1 of the cleaning section 111 can be 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, etc.

[0097] Please see Figure 9 and Figure 13 To ensure the cleaning effect of the cleaning section 111, in this embodiment of the invention, the cleaning section 111 is gradually expanded in the direction away from the filter assembly 2. Specifically, the length of the cleaning section 111 increases in the direction away from the filter assembly 2. Let the length of the cleaning section 111 be L1. If the filter surface 22 is an inclined plane extending radially, then the shape of the cleaning section 111 is exactly matched with the filter surface 22, ensuring the cleaning effect of the filter surface 22. If the filter surface 22 is a plane, the frictional force is greater the further away from the central axis of the filter assembly 2, thereby improving the cleaning effect at the outer corner of the filter assembly 2 and reducing dead corners. The outer contour of the side of the cleaning section 111 away from the base 112 of the cleaning assembly can be straight, arc-shaped, or stepped.

[0098] To further ensure the cleaning effect of filter component 2, please refer to the embodiments of this utility model. Figure 1 and Figure 2 The cleaning part 111 and the filter surface 22 are press-fitted together, so that the cleaning part 111 has a certain frictional force on the filter assembly 2, thereby ensuring the cleaning effect without affecting the relative movement between the cleaning part 111 and the filter assembly 2.

[0099] In another embodiment of this utility model, the interference fit between the cleaning part 111 and the filter surface 22 is greater than or equal to 0.2 mm and less than or equal to 0.4 mm. That is, the cleaning part 111 extends into the filter surface 22 on the side facing the filter surface 22, thereby improving the cleaning effect. If the depth of the cleaning part 111 extending into the filter surface 22 is greater than 0.4 mm, the friction between the cleaning part 111 and the filter assembly 2 will be too large, which may damage the cleaning part 111 and the filter assembly 2, or affect the rotation of the cleaning part 111 relative to the filter assembly 2, thereby affecting the service life of the pre-filter. If the depth of the cleaning part 111 extending into the filter assembly 2 is less than 0.2 mm, the friction between the cleaning part 111 and the filter assembly 2 will be too small, which may result in insufficient friction between the cleaning part 111 and the filter surface 22, resulting in inadequate cleaning of the filter surface 22 and affecting the cleaning effect of the pre-filter. Specifically, the depth to which the cleaning part 111111 extends into the filter assembly 22 can be 0.2mm, 0.22mm, 0.25mm, 0.27mm, 0.3mm, 0.32mm, 0.35mm, 0.37mm, 0.4mm, etc.

[0100] Please see Figures 14 to 17 In another embodiment of this utility model, the cleaning part 111 extends obliquely relative to the axial direction of the outer frame 1 along its circumference. This enhances the deformation capability of the cleaning part 111 in the axial direction of the outer frame 1. The cleaning part 111 and the filter surface 22 will abut against each other in the axial direction of the outer frame 1. The cleaning part 111 is easily deformable in this abutment direction, which helps reduce the pressure between the cleaning part 111 and the filter surface 22. This reduces the friction between the cleaning part 111 and the filter surface 22 when the outer frame 1 and the filter assembly 2 rotate relative to each other. It can be understood that the oblique direction of the cleaning part 111 is conducive to its deformation. In this embodiment, the outer frame 1 rotates circumferentially, and the cleaning part 111 is easily deformable in this direction, further reducing the friction between the cleaning part 111 and the filter surface 22, thus ensuring smooth rotation of the outer frame 1. Furthermore, the cleaning part 111 can more easily cover a larger area on the filter surface 22, which helps improve the cleaning effect of the cleaning part 111 on the filter surface 22.

[0101] In one embodiment, multiple cleaning structures are distributed circumferentially on the outer frame 1. Specifically, each cleaning structure may have the same number of cleaning parts 111 corresponding to the number of filter surfaces 22. This ensures that each filter surface 22 is cleaned by the cleaning parts 111 of the multiple circumferentially distributed cleaning structures, guaranteeing effective cleaning of the filter assembly 2. Alternatively, a cleaning structure may only have cleaning parts 111 on a portion of the filter surfaces 22. By staggering the cleaning parts 111 on the multiple circumferentially distributed cleaning structures, each filter surface 22 is provided with at least one cleaning part 111. This ensures coverage of the filter surfaces 22 while also dispersing the friction between the cleaning parts 111 and the filter surfaces 22 circumferentially, improving the smoothness and stability of the outer frame 1's rotation.

[0102] The cleaning parts 111 are arranged at an angle relative to the axial direction of the outer frame 1 along the same circumference. This allows the angle of the cleaning parts 111 to be easily adjusted according to the rotation direction of the outer frame 1, reducing friction between the cleaning parts 111 and the cleaning surface and ensuring smooth rotation of the outer frame 1. For example, when the outer frame 1 needs to rotate clockwise, each cleaning part 111 is angled counterclockwise.

[0103] In one embodiment, for a plurality of cleaning sections 111 located on the same axial direction, adjacent cleaning sections 111 are arranged at an acute angle. This facilitates the spatial arrangement of the plurality of cleaning sections 111 and helps ensure that the cleaning sections 111 cover the filter surface 22 axially. Preferably, the included angle between adjacent cleaning sections 111 is 60 to 80 degrees. That is, the included angle between adjacent cleaning sections 111 is greater than or equal to 60 degrees and less than or equal to 80 degrees. Of course, in other embodiments, the included angle between adjacent cleaning sections 111 can be adjusted to a range less than 60 degrees or greater than 80 degrees.

[0104] In one embodiment, the cleaning part 111 and the filter surface 22 are in an interference fit. This allows the cleaning part 111 to more thoroughly clean impurities from the filter surface 22, thereby enhancing the cleaning power of the cleaning structure on the filter assembly 2, ensuring the filtration effect of the filter assembly 2, and extending the service life of the pre-filter. Specifically, the interference fit between the cleaning part 111 and the filter surface 22 is 0.8mm to 1.2mm. That is, the interference fit between the cleaning part 111 and the filter surface 22 is greater than or equal to 0.8mm and less than or equal to 1.2mm. This ensures that the contact degree between the cleaning part 111 and the filter surface 22 is within a suitable range, guaranteeing the cleaning power of the cleaning part 111 on the filter surface 22 while preventing excessive friction between the cleaning part 111 and the filter surface 22, thus avoiding excessive interference with the rotation of the outer frame 1 and reducing wear on the cleaning part 111. Of course, in other embodiments, the interference fit between the cleaning section 111 and the filter surface 22 can also be adjusted to a range of less than 0.8 mm or greater than 1.2 mm as needed.

[0105] In the prior art, to clean the inner surface of the filter chamber, the outer cleaning brush 114 is usually pressed against the inner surface of the filter chamber. The rotation of the outer frame 1 within the filter chamber causes the outer cleaning brush 114 to scrape off impurities from the surface of the filter chamber. However, this cleaning method results in significant friction between the outer cleaning brush 114 and the inner wall of the filter chamber, which may affect the normal rotation of the outer frame 1 or damage the outer cleaning brush 114, thus affecting the service life of the pre-filter.

[0106] Therefore, in this embodiment, the outer cleaning brush 114 is fitted with a gap to reduce the friction between the outer cleaning brush 114 and the inner wall of the filter chamber. Furthermore, since the outer frame 1 will inevitably generate a certain degree of vibration and oscillation when it rotates in the filter chamber, the vibration and oscillation of the outer frame 1 are used to clean the inner wall of the filter chamber, thereby achieving a better cleaning effect.

[0107] Furthermore, the gap between the external cleaning brush 114 and the inner wall of the filter chamber is greater than or equal to 0 mm and less than or equal to 0.3 mm. Specifically, if the gap between the external cleaning brush 114 and the inner wall of the filter chamber is less than 0 mm, the distance between the external cleaning brush 114 and the inner wall of the filter chamber is too small, and the end of the external cleaning brush 114 away from the outer frame 1 presses against the inner wall of the filter chamber, resulting in a large frictional force between the external cleaning brush 114 and the inner wall of the filter chamber. This may affect the normal rotation of the outer frame 1 or cause damage to the external cleaning brush 114, affecting the service life of the pre-filter. If the gap between the external cleaning brush 114 and the inner wall of the filter chamber is greater than 0.3 mm, the distance between the external cleaning brush 114 and the inner wall of the filter chamber is too large, and the end of the external cleaning brush 114 away from the outer frame 1 cannot contact the inner wall of the filter chamber through the vibration and swing of the outer frame 1, or clean the inner wall of the filter chamber, and the external cleaning brush 114 fails. Therefore, the gap between the external cleaning brush 114 and the inner wall of the filter chamber is set to be greater than or equal to 0 mm and less than or equal to 0.3 mm. This ensures the cleaning effect of the external cleaning brush 114 while reducing the friction between the external cleaning brush 114 and the interior of the filter chamber. Specifically, the gap between the external cleaning brush 114 and the inner wall of the filter chamber can be 0 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc.

[0108] Please see Figures 1 to 6 In this embodiment of the present invention, the end of the external cleaning brush 114 away from the outer frame 1 is set with a pointed tip. Specifically, the end of the external cleaning brush 114 away from the outer frame 1 is set with a pointed tip, that is, the thickness of the end of the external cleaning brush 114 away from the outer frame 1 is reduced, thereby improving the effect of the external cleaning brush 114 on the inner wall of the filter chamber and improving the cleaning effect of the external cleaning brush 114 on the inner wall of the filter chamber.

[0109] Furthermore, at least a portion of the external cleaning brush 114 is tapered away from the outer frame 1. That is, the thickness of at least a portion of the external cleaning brush 114 along the axial direction of the outer frame 1 gradually decreases away from the outer frame 1. This ensures that the external cleaning brush 114 exerts a certain force on the inner wall of the filter chamber, thus guaranteeing the cleaning effect, without affecting the relative movement of the external cleaning brush 114 against the inner wall of the filter chamber. On the other hand, the tapering shape of the external cleaning brush 114 away from the outer frame 1 also allows the thickness of the side of the external cleaning brush 114 connected to the outer frame 1 to be greater than the thickness of the external cleaning brush 114 itself, thereby improving the stability of the connection between the external cleaning brush 114 and the outer frame 1.

[0110] The cleaning brush can be entirely tapered away from the outer frame 1, in which case the cross-section of the cleaning brush perpendicular to the axis of the outer frame 1 is triangular. Alternatively, only a portion of the cleaning brush can be tapered away from the outer frame 1, in which case the cross-section of the cleaning brush perpendicular to the axis of the outer frame 1 is trapezoidal or a combination of rectangle and triangle.

[0111] In an embodiment of this utility model, the mounting part 113 is provided with a receiving groove 115 on the side facing the inner wall of the filter chamber, and the outer cleaning brush 114 is disposed in the receiving groove 115, and partially protrudes from the receiving groove 115. Specifically, the gap between the outer frame 1 and the inner wall of the cleaning brush is generally small. Therefore, if the installation position of the outer cleaning brush 114 is flush with the outer periphery of the outer frame 1, the overall width of the outer cleaning brush 114 is small, and the swing amplitude of the outer cleaning brush 114 is often small. This makes it impossible for the outer cleaning brush 114 to swing to a certain extent when cleaning the inner wall of the filter chamber, resulting in limited cleaning effect. Therefore, the mounting part 113 has a receiving groove 115 on the side facing the inner wall of the filter chamber. This receiving groove 115 is recessed inward towards the outer frame 1. Thus, the outer cleaning brush 114 is located in the receiving groove 115, thereby increasing the installation space and width of the outer cleaning brush 114. This increases the swing amplitude of the outer cleaning brush 114 when cleaning the inner wall of the filter chamber, improving the cleaning effect of the outer cleaning brush 114. Furthermore, a portion of the outer cleaning brush 114 protrudes from the receiving groove 115, extending into the inner wall of the filter chamber, facilitating the cleaning of the inner wall of the filter chamber by the outer cleaning brush 114.

[0112] 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.

[0113] The above are merely exemplary embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the technical concept of this utility model and the contents of the specification and drawings of this utility model, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A pre-filter, characterized in that, include: The casing has a water filter chamber; A filter assembly is disposed within the water filtration chamber; as well as An outer frame, disposed within the water filtration chamber, is rotatably fitted around the outer periphery of the filter assembly. An inner cleaning brush is installed on the inner side of the outer frame, and an outer cleaning brush protrudes from the outer side of the outer frame. The inner cleaning brush has a cleaning part that extends axially along the outer frame. The filter assembly has a filter surface that extends radially along the outer frame. The cleaning part is correspondingly disposed to the filter surface. The cleaning part is used to clean the filter surface, and the outer cleaning brush is used to clean the inner wall of the water filtration chamber.

2. The pre-filter as described in claim 1, characterized in that, The outer frame is also equipped with a mounting part, the inner cleaning brush is disposed on the side of the mounting part facing the inside of the outer frame, and the outer cleaning brush is disposed on the side of the mounting part facing the outside of the outer frame.

3. The pre-filter as described in claim 2, characterized in that, The mounting part is detachably mounted on the outer frame.

4. The pre-filter as described in claim 2, characterized in that, The mounting part is snapped into the outer frame.

5. The pre-filter as described in claim 2, characterized in that, The mounting part is provided with a laterally protruding snap-fit ​​part, the outer frame is provided with a mounting hole, and the inner wall of the mounting hole is provided with a corresponding snap-fit ​​groove. When the mounting part is inserted into the mounting hole, the snap-fit ​​part is inserted into the snap-fit ​​groove.

6. The pre-filter as described in claim 5, characterized in that, The snap-fit ​​portion has a guide surface on the side facing the inner cleaning brush; and / or, The extension direction of the snap-fit ​​groove is set at an angle to the tangent of the outer frame at the mounting hole, and the snap-fit ​​groove is inclined towards the inner side of the outer frame.

7. The pre-filter as described in claim 5, characterized in that, The mounting hole has a recessed groove at one end facing the outer side of the outer frame, and a limiting stop is protruding on the side of the mounting part near the outer cleaning brush, which can be engaged in the recessed groove.

8. The pre-filter as described in claim 7, characterized in that, Along the radial direction of the outer frame, the depth of the recess is greater than or equal to the thickness of the limiting stop; and / or, The limiting stop is configured as an arc segment, and the arc segment is parallel to the circumference of the outer frame.

9. The pre-filter as described in claim 5, characterized in that, The contour of the mounting portion facing the inner cleaning brush is flush with the inner contour of the outer frame at the mounting hole.

10. The pre-filter as described in claim 2, characterized in that, The mounting part, the outer cleaning brush, and the inner cleaning brush are integrally formed.

11. The pre-filter as claimed in claim 1, characterized in that, The cleaning section is located at least on the side of the filter assembly where the inner cleaning brushes are distributed along the axial direction, and is parallel to the axial direction of the outer frame.

12. The pre-filter as described in claim 11, characterized in that, The width of the cleaning section is greater than or equal to 4 mm and less than or equal to 6 mm; and / or, The thickness of the cleaning section is greater than or equal to 0.3 mm and less than or equal to 0.7 mm.

13. The pre-filter as described in claim 11, characterized in that, The cleaning section gradually expands in a direction away from the filter assembly; and / or, The cleaning section and the filter surface are press-fitted together; and / or The interference fit between the cleaning section and the filter surface is 0.2 mm to 0.4 mm.

14. The pre-filter as claimed in claim 1, characterized in that, The cleaning section extends obliquely relative to the axial direction of the outer frame along its circumference.

15. The pre-filter as described in claim 14, characterized in that, The cleaning section and the filter surface are distributed in multiple ways along the axial direction of the outer frame. Furthermore, the plurality of cleaning sections are inclined relative to the axial direction of the outer frame along the same circumference; and / or, adjacent cleaning sections are arranged at an acute angle.

16. The pre-filter as described in claim 14, characterized in that, The cleaning section and the filter surface are press-fitted together; and / or The interference fit between the cleaning section and the filter surface is 0.8 mm to 1.2 mm.

17. The pre-filter as claimed in claim 1, characterized in that, The inner cleaning brush also includes a base portion, which protrudes from the inner peripheral side of the outer frame, and the cleaning part is connected to the outer peripheral side of the base portion.

18. The pre-filter as claimed in any one of claims 1 to 17, characterized in that, The external cleaning brush is fitted with a clearance between itself and the inner wall of the filtration chamber; and / or, The gap between the external cleaning brush and the inner wall of the filter chamber is greater than or equal to 0 mm and less than or equal to 0.3 mm.

19. The pre-filter as claimed in any one of claims 1 to 17, characterized in that, The external cleaning brush is positioned with a pointed end away from the axis of the outer skeleton; and / or, At least a portion of the external cleaning brush is tapered in a direction away from the axis of the exoskeleton.

20. The pre-filter as claimed in any one of claims 2 to 10, characterized in that, The mounting part has a receiving groove on the side facing the outer side of the outer frame, and the external cleaning brush is installed in the receiving groove and partially extends out of the receiving groove.

21. A water supply system, characterized in that, Includes a pre-filter as described in any one of claims 1 to 20.

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