Pre-filter and water system

Abstract

The utility model discloses a prefilter and water consuming system relates to filter technical field, wherein prefilter includes casing and outer skeleton, casing has the water filtration chamber, outer skeleton is provided in the water filtration chamber, and the outer side of outer skeleton is equipped with the outer cleaning brush in convex, and the outer cleaning brush is equipped with the water consuming system. The outer cleaning brush is used for cleaning the inner wall of the water filtering cavity, and the outer cleaning brush is in clearance fit with the inner wall of the water filtering cavity; according to the technical scheme provided by the utility model, the inner surface of the pre-filter can be conveniently cleaned, and the possibility of bacterium breeding is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of filters, in particular to a pre-filter and a water use system. Background Art

[0002] As people's living standards continue to improve, their demands for daily water use are also increasing. Due to long-term disrepair and aging of tap water pipes, large particles harmful to the human body, such as silt, rust, and bloodworms, are present in the water, seriously affecting residents' water health. Therefore, a pre-filter is installed to filter out large particles before tap water is used.

[0003] However, while the pre-filter is filtering water, impurities may adhere to the inner surface of the filter chamber. If not cleaned in time, bacteria may grow and the service life of the pre-filter may be affected. Utility Model Content

[0004] The main purpose of the utility model is to provide a pre-filter and a water system, which are intended to facilitate cleaning of the inner surface of the pre-filter and reduce the possibility of bacterial growth.

[0005] To achieve the above-mentioned purpose, the pre-filter proposed by the present invention comprises:

[0006] a housing having a water filtering cavity; and

[0007] An outer frame is arranged in the water filter cavity, and an outer cleaning brush is protruded from the outer side of the outer frame. The outer cleaning brush is used to clean the inner wall of the water filter cavity, and a gap is formed between the outer cleaning brush and the inner wall of the water filter cavity.

[0008] In one embodiment, the gap between the outer cleaning brush and the inner wall of the water filter chamber is greater than or equal to 0 mm and less than or equal to 0.3 mm.

[0009] In one embodiment, the outer cleaning brush is provided with a pointed end at an end away from the outer frame.

[0010] In one embodiment, at least a portion of the outer cleaning brush is tapered in a direction away from the outer frame.

[0011] In one embodiment, the thickness of the outer cleaning brush on a side close to the outer frame is less than or equal to 0.4 mm, less than or equal to 0.6 mm; and / or,

[0012] The thickness of the outer cleaning brush at a side away from the outer frame is less than or equal to 0.2 mm, and less than or equal to 0.4 mm.

[0013] In one embodiment, the outer cleaning brush is configured as a brush bar extending along the axial direction of the outer skeleton.

[0014] In one embodiment, the outer cleaning brush is configured as a flexible brush strip; and / or the outer cleaning brush is made of a flexible material.

[0015] In one embodiment, the pre-filter further includes a mounting portion, the mounting portion is disposed on the outer frame, and the outer cleaning brush is disposed on a side of the mounting portion facing the inner wall of the water filter chamber.

[0016] In one embodiment, a receiving groove is provided on one side of the mounting portion facing the inner wall of the water filter chamber, and the external cleaning brush is provided in the receiving groove and partially protrudes from the receiving groove.

[0017] In one embodiment, at least the corners of the slot of the receiving slot are chamfered.

[0018] In one embodiment, the extension direction of the outer cleaning brush is parallel to the axial direction of the outer skeleton; and / or,

[0019] The mounting portion is detachably mounted on the outer frame.

[0020] In one embodiment, the exoskeleton is provided with a mounting hole for inserting the mounting portion, and one side of the mounting portion is provided with a limiting rib extending along the circumference of the exoskeleton.

[0021] In one embodiment, the limiting rib is configured as an arc segment, and the arc segment is parallel to the circumference of the exoskeleton, or the radius of the arc segment is greater than or equal to 22 mm and less than or equal to 30 mm.

[0022] The utility model also provides a water use system, comprising the pre-filter as described above.

[0023] The technical solution of the present utility model is to provide a water filter chamber within the housing, an exoskeleton disposed within the water filter chamber, and an external cleaning brush mounted on the outside of the exoskeleton. The external cleaning brush faces the wall of the water filter chamber, thereby cleaning the inner surface of the water filter chamber, reducing the possibility of impurities adhering to the surface of the water filter chamber and causing bacteria to grow in the pre-filter, thereby ensuring the service life of the pre-filter. The external cleaning brush is clearance-matched with the inner wall of the water filter chamber, thereby reducing the friction between the external cleaning brush and the inner wall of the water filter chamber. Since the exoskeleton inevitably generates a certain degree of vibration and swing when rotating within the water filter chamber, the vibration and swing of the exoskeleton are utilized to clean the inner wall of the water filter chamber, thereby achieving a cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0025] Figure 1 This is a schematic diagram of the structure of an outer frame of an embodiment of a pre-filter provided by the present invention at an angle;

[0026] Figure 2 for Figure 1 Schematic diagram of the structure of the meso-exo-skeleton from another angle;

[0027] Figure 3 for Figure 2 Cross-section of the meso-exoskeleton along AA;

[0028] Figure 4 for Figure 3 A partial enlarged view of point A in the middle;

[0029] Figure 5 for Figure 1 Schematic diagram of the structure of Chinese and foreign cleaning brushes.

[0030] Description of Figure Numbers:

[0031] 1. Exoskeleton; 101. Mounting hole; 12. External cleaning brush; 121. Brush strip; 122. Mounting portion; 123. Receiving groove; 124. Limiting rib.

[0032] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

[0034] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0035] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] The utility model provides a pre-filter, the internal components of which can regularly clean the filter assembly therein to discharge previously intercepted large particles, thereby eliminating the need for manual disassembly and cleaning of the pre-filter and improving the service life of the pre-filter.

[0037] Water systems, such as whole-house water purification systems, typically feature a pre-filter to filter out large particles from tap water. This not only ensures water safety but also extends the life of appliances, prevents clogged household water pipes, and improves residents' health. The pre-filter is the first coarse filtration device in a whole-house water purification system. It is a physical filter that primarily intercepts large particles larger than 40 microns, ensuring back-end water safety.

[0038] See also Figures 1 to 5 In one embodiment of the present invention, the pre-filter comprises:

[0039] a housing having a water filtering cavity; and

[0040] The outer frame 1 is arranged in the water filter cavity, and an outer cleaning brush 12 is protruded from the outer side of the outer frame 1. The outer cleaning brush 12 is used to clean the inner wall of the water filter cavity, and a gap is formed between the outer cleaning brush 12 and the inner wall of the water filter cavity.

[0041] Specifically, the housing includes a water filter chamber, within which an exoskeleton 1 is positioned. Exoskeleton 1 supports the internal structure of the pre-filter, protecting the filter assembly and other components from external pressure or impact. Exoskeleton 1 is rotatable within the chamber, and an external cleaning brush 12 is mounted on the outside of the exoskeleton 1. This brush faces the chamber wall, thereby cleaning the chamber's inner walls and reducing the potential for bacterial growth within the pre-filter caused by impurities adhering to the chamber's surface, thereby ensuring the pre-filter's service life.

[0042] In the prior art, to clean the inner surface of the water filter cavity, the outer cleaning brush 12 is usually pressed against the inner surface of the water filter cavity. The outer frame 1 rotates within the water filter cavity, allowing the outer cleaning brush 12 to scrape off impurities on the surface of the water filter cavity. However, this cleaning method causes high friction between the outer cleaning brush 12 and the inner wall of the water filter cavity, which may affect the normal rotation of the outer frame 1 or cause damage to the outer cleaning brush 12, shortening the service life of the pre-filter.

[0043] Therefore, in this embodiment, the gap between the outer cleaning brush 12 and the inner wall of the water filter chamber is matched, thereby reducing the friction between the outer cleaning brush 12 and the inner wall of the water filter chamber, and since the outer skeleton 1 will inevitably produce a certain degree of vibration and swing when rotating in the water filter chamber, the vibration and swing of the outer skeleton 1 are used to clean the inner wall of the water filter chamber to achieve a better cleaning effect.

[0044] Furthermore, the gap between the outer cleaning brush 12 and the inner wall of the water 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 outer cleaning brush 12 and the inner wall of the water filter chamber is less than 0 mm, the distance between the outer cleaning brush 12 and the inner wall of the water filter chamber is too small, and the end of the outer cleaning brush 12 away from the exoskeleton 1 presses the inner wall of the water filter chamber, causing the friction between the outer cleaning brush 12 and the inner wall of the water filter chamber to be large, which may affect the normal rotation of the exoskeleton 1 or cause damage to the outer cleaning brush 12, affecting the service life of the pre-filter; if the gap between the outer cleaning brush 12 and the inner wall of the water filter chamber is greater than 0.3 mm, the distance between the outer cleaning brush 12 and the inner wall of the water filter chamber is too large, and the end of the outer cleaning brush 12 away from the exoskeleton 1 cannot contact the inner wall of the water filter chamber through the vibration and swing of the exoskeleton 1, or clean the inner wall of the water filter chamber, and the outer cleaning brush 12 fails. Therefore, setting the gap between the outer cleaning brush 12 and the inner wall of the water filter chamber to be greater than or equal to 0 mm and less than or equal to 0.3 mm can ensure the cleaning effect of the outer cleaning brush 12 while reducing the friction between the outer cleaning brush 12 and the interior of the water filter chamber. Specifically, the gap between the outer cleaning brush 12 and the inner wall of the water filter chamber can be 0 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc.

[0045] The outer cleaning brush 12 can be integrally formed with the outer frame 1, thereby facilitating the assembly of the outer cleaning brush 12. In other embodiments, the outer cleaning brush 12 can also be fastened to the outer frame 1 by snapping, bonding, or fastening with fasteners.

[0046] See also Figures 3 to 5In the embodiment of the present invention, the end of the outer cleaning brush 12 away from the outer frame 1 is pointed. Specifically, the end of the outer cleaning brush 12 away from the outer frame 1 is pointed, that is, the thickness of the outer cleaning brush 12 away from the outer frame 1 is reduced, thereby improving the effect of the outer cleaning brush 12 on the inner wall of the water filter cavity and improving the cleaning effect of the outer cleaning brush 12 on the inner wall of the water filter cavity.

[0047] Furthermore, at least a portion of the outer cleaning brush 12 is tapered in the direction away from the exoskeleton 1. That is, the thickness of at least a portion of the outer cleaning brush 12 along the axial direction of the exoskeleton 1 gradually decreases in the direction away from the exoskeleton 1, thereby ensuring that the outer cleaning brush 12 exerts a certain force on the inner wall of the water filter chamber, thereby ensuring the cleaning effect, while not affecting the relative movement of the outer cleaning brush 12 with respect to the inner wall of the water filter chamber. On the other hand, the outer cleaning brush 12 is tapered in the direction away from the exoskeleton 1, which can also make the thickness of the side of the outer cleaning brush 12 connected to the exoskeleton 1 greater than the thickness of the side of the outer cleaning brush 12 away from the exoskeleton 1, thereby improving the stability of the connection between the outer cleaning brush 12 and the exoskeleton 1.

[0048] Among them, the entire outer cleaning brush 12 can be tapered in the direction away from the exoskeleton 1, and in this case the cross-section of the outer cleaning brush 12 perpendicular to the axial direction of the exoskeleton 1 is triangular. Alternatively, only a portion of the outer cleaning brush 12 can be tapered in the direction away from the exoskeleton 1, and in this case the cross-section of the outer cleaning brush 12 perpendicular to the axial direction of the exoskeleton 1 is trapezoidal or a combination of a rectangle and a triangle.

[0049] For further information, see Figure 4 , the thickness of the side of the outer cleaning brush 12 away from the outer skeleton 1 is less than or equal to 0.2mm, and less than or equal to 0.4mm. Specifically, assuming that the thickness of the side of the outer cleaning brush 12 away from the outer skeleton 1 is T1, if the thickness of the side of the outer cleaning brush 12 away from the outer skeleton 1 is greater than 0.4mm, the thickness of the side of the outer cleaning brush 12 away from the outer skeleton 1 is too large, the friction between the outer cleaning brush 12 and the inner wall of the water filter chamber increases, and the force between the two may decrease, thereby affecting the cleaning effect of the outer cleaning brush 12 on the inner wall of the water filter chamber; if the thickness of the side of the outer cleaning brush 12 away from the outer skeleton 1 is less than 0.2mm, the thickness of the side of the outer cleaning brush 12 away from the outer skeleton 1 is too small, the effective area between the outer cleaning brush 12 and the inner wall of the water filter chamber is reduced, which will also affect the cleaning effect of the outer cleaning brush 12 on the inner wall of the water filter chamber, and the thickness of the side of the outer cleaning brush 12 away from the outer skeleton 1 is too small, which will also increase the difficulty of processing the outer cleaning brush 12. Specifically, the thickness of the side of the outer cleaning brush 12 away from the outer skeleton 1 can be 0.2 mm, 0.22 mm, 0.25 mm, 0.27 mm, 0.3 mm, 0.32 mm, 0.35 mm, 0.37 mm, 0.4 mm, etc.

[0050] Further, see again Figure 4 , the thickness of the side of the outer cleaning brush 12 close to the outer skeleton 1 is less than or equal to 0.4mm, and less than or equal to 0.6mm. Specifically, assuming that the thickness of the side of the outer cleaning brush 12 close to the outer skeleton 1 is T2, and the thickness of the side of the outer cleaning brush 12 close to the outer skeleton 1 is less than 0.4mm, then the thickness of the side of the outer cleaning brush 12 close to the outer skeleton 1 is too small, and the overall hardness of the outer cleaning brush 12 is too low, and the strength of the outer cleaning brush 12 on the inner wall of the water filter cavity may not be sufficient, affecting the cleaning effect, and it is difficult to ensure the stability of the connection between the outer cleaning brush 12 and the exoskeleton 1; if the thickness of the side of the outer cleaning brush 12 close to the exoskeleton 1 is greater than 0.6mm, then the thickness of the side of the outer cleaning brush 12 close to the exoskeleton 1 is too large, and the overall hardness of the outer cleaning brush 12 is too high, and the outer cleaning brush 12 cannot swing to a certain extent when cleaning the inner wall of the water filter cavity, resulting in limited cleaning effect. Specifically, the thickness of the outer cleaning brush 12 on the side close to the outer frame 1 can be 0.4 mm, 0.42 mm, 0.45 mm, 0.47 mm, 0.5 mm, 0.52 mm, 0.55 mm, 0.57 mm, 0.6 mm, etc.

[0051] See also Figures 1 to 3 In an embodiment of the present invention, the outer cleaning brush 12 is configured as a brush strip 121 extending axially along the exoskeleton 1. Specifically, the outer cleaning brush 12 is configured as a brush strip 121, thereby facilitating the molding of the outer cleaning brush 12. Furthermore, the outer cleaning brush 12 extends axially along the exoskeleton 1, thereby increasing the cleaning area of ​​the outer cleaning brush 12. In this embodiment, the outer cleaning brush 12 has a linear structure. In other embodiments, the outer cleaning brush 12 may extend in a spiral or curved manner axially along the exoskeleton 1.

[0052] In the embodiment of the present invention, the outer cleaning brush 12 is configured as a flexible brush strip 121, thereby facilitating the adaptive cooperation between the outer cleaning brush 12 and the inner wall of the water filter cavity, thereby improving the cleaning effect of the inner wall of the water filter cavity. The outer cleaning brush 12 can be made of a flexible material, or can be made of rubber or flexible plastic material.

[0053] See also Figures 3 to 5 In an embodiment of the present invention, the pre-filter further includes a mounting portion 122, which is disposed on the outer frame 1. The outer cleaning brush 12 is disposed on the side of the mounting portion 122 facing the inner wall of the water filter chamber. Specifically, the mounting portion 122 is used to assemble with the outer frame 1. The outer cleaning brush 12 is disposed on the mounting portion 122. Installing the mounting portion 122 facilitates installation of the outer cleaning brush 12.

[0054] Among them, the mounting portion 122 and the outer cleaning brush 12 can be integrally formed, so as to facilitate the installation of the multiple outer cleaning brushes 12 and improve the installation stability of the outer cleaning brush 12. In other embodiments, the outer cleaning brush 12 and the mounting portion 122 can also be separately formed, such as the outer cleaning brush 12 is bonded or snapped or fixed to the mounting portion 122 by fasteners. The mounting portion 122 can be separately formed from the exoskeleton 1, such as the mounting portion 122 is bonded or snapped or fixed to the exoskeleton 1 by fasteners, so as to facilitate the overall processing of the exoskeleton 1 and facilitate the selection of materials for the exoskeleton 1 and the mounting portion 122. In other embodiments, the mounting portion 122 can also be integrally formed with the exoskeleton 1.

[0055] In one embodiment, the mounting portion 122 is removably mounted to the exoskeleton 1, thereby facilitating the removal of the external cleaning brush 12. If the external cleaning brush 12 fails, it can be promptly replaced without having to replace the entire exoskeleton 1, thereby facilitating maintenance of the pre-filter. In this embodiment, the exoskeleton 1 is provided with a mounting hole 101, and the mounting portion 122 snaps into the mounting hole 101, thereby facilitating assembly of the mounting hole 101.

[0056] In an embodiment of the present invention, the extension direction of the outer cleaning brush 12 is parallel to the axial direction of the outer frame 1, that is, the outer cleaning brush 12 is arranged parallel to the axial direction of the outer frame 1, thereby facilitating the installation of the outer cleaning brush 12 and achieving a better cleaning effect.

[0057] See again Figures 3 to 5 In an embodiment of the present invention, a receiving groove 123 is provided on the side of the mounting portion 122 facing the inner wall of the water filter chamber. The outer cleaning brush 12 is disposed in the receiving groove 123 and partially protrudes from the receiving groove 123. Specifically, the gap between the exoskeleton 1 and the inner wall of the cleaning brush is generally small. Therefore, if the outer cleaning brush 12 is mounted flush with the outer periphery of the exoskeleton 1, the overall width of the outer cleaning brush 12 is small, and the swing amplitude of the outer cleaning brush 12 is often small, so that the outer cleaning brush 12 cannot swing a certain amplitude when cleaning the inner wall of the water filter chamber, resulting in limited cleaning effect. Therefore, a receiving groove 123 is provided on the side of the mounting portion 122 facing the inner wall of the water filter chamber. The receiving groove 123 is recessed toward the inner side of the exoskeleton 1. Therefore, the outer cleaning brush 12 is disposed in the receiving groove 123, thereby increasing the installation space for the outer cleaning brush 12 and increasing the width of the outer cleaning brush 12. This increases the swing amplitude of the outer cleaning brush 12 when cleaning the inner wall of the water filter chamber, thereby improving the cleaning effect of the outer cleaning brush 12. Furthermore, a portion of the outer cleaning brush 12 protrudes from the receiving groove 123 , thereby extending toward the inner wall of the water filter cavity, making it convenient for the outer cleaning brush 12 to clean the inner wall of the water filter cavity.

[0058] Furthermore, at least the corners of the receiving groove 123 are chamfered. Specifically, the chamfered corners of the receiving groove 123 facilitate the processing of the receiving groove 123 and also provide a certain degree of avoidance for the swing of the external cleaning brush 12 when cleaning the inner wall of the water filter chamber, thereby improving the cleaning effect of the external cleaning brush 12. The chamfer can be configured as a rounded corner.

[0059] Among them, the receiving groove 123 can be chamfered only at the corner of the groove, or the receiving groove 123 can be chamfered at the corner on the side close to the central axis of the exoskeleton 1, or the receiving groove 123 can be directly set to be semicircular in the cross section perpendicular to the axial direction of the exoskeleton 1.

[0060] In an embodiment of the present invention, the exoskeleton 1 is provided with a mounting hole 101 for inserting the mounting portion 122, and a limiting rib 124 extending along the circumference of the exoskeleton 1 is provided on one side of the mounting portion 122. Specifically, the exoskeleton 1 is provided with the mounting hole 101, and the mounting portion 122 is snapped into the mounting hole 101, thereby facilitating the assembly of the mounting portion 122. The limiting rib 124 is provided on one side of the mounting portion 122 to limit the installation of the mounting portion 122, control the insertion depth of the mounting portion 122, and ensure the installation accuracy of the mounting portion 122. The limiting rib 124 extends along the circumference of the exoskeleton 1, so that the contour of the limiting rib 124 on the side away from the exoskeleton 1 is roughly parallel to the outer circumference of the exoskeleton 1, thereby making the limiting rib 124 compatible with the exoskeleton 1.

[0061] Preferably, the limiting rib 124 is configured as an arc segment, and the arc segment is parallel to the circumference of the exoskeleton 1, so that the contour of the limiting rib 124 on the side away from the exoskeleton 1 is roughly parallel to the outer peripheral side of the exoskeleton 1, thereby reducing the possibility of collision and friction between the limiting rib 124 and the inner wall of the water filter chamber.

[0062] See also Figure 4 In an embodiment of the present invention, the radius of the arc segment is greater than or equal to 22 mm and less than or equal to 30 mm. Specifically, assuming that the radius of the arc segment is r1, if the radius of the arc segment is greater than 30 mm, it may be much larger than the radius of the exoskeleton 1, resulting in the outer contour of the arc segment not fitting well with the outer contour of the exoskeleton 1, causing the edge of the arc segment to protrude from the outer contour of the exoskeleton 1; if the radius of the arc segment is less than 22 mm, it may be much smaller than the radius of the exoskeleton 1, resulting in the outer contour of the arc segment not fitting well with the outer contour of the exoskeleton 1, causing the middle of the arc segment to protrude from the outer contour of the exoskeleton 1. Specifically, the radius of the arc segment can be 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, etc.

[0063] The present utility model also proposes a water use system, which includes a pre-filter. The specific structure of the pre-filter refers to the above-mentioned embodiment. Since the water use system adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0064] The above are merely exemplary embodiments of the present invention and are not intended to limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A pre-filter, characterized in that: include: The housing has a water filtering cavity; as well as An outer frame is arranged in the water filter cavity, and an outer cleaning brush is protruded from the outer side of the outer frame. The outer cleaning brush is used to clean the inner wall of the water filter cavity, and a gap is formed between the outer cleaning brush and the inner wall of the water filter cavity.

2. The prefilter according to claim 1, wherein The gap between the outer cleaning brush and the inner wall of the water filter cavity is greater than or equal to 0 mm and less than or equal to 0.3 mm.

3. The prefilter according to claim 1, wherein: The outer cleaning brush is arranged with a pointed end at one end away from the outer frame.

4. The prefilter according to claim 1, wherein At least a portion of the outer cleaning brush is tapered in a direction away from the outer frame.

5. The prefilter according to claim 1, wherein: The thickness of the outer cleaning brush on a side close to the outer frame is less than or equal to 0.4 mm, less than or equal to 0.6 mm; and / or, The thickness of the outer cleaning brush at a side away from the outer frame is less than or equal to 0.2 mm, and less than or equal to 0.4 mm.

6. The prefilter according to claim 1, wherein: The outer cleaning brush is configured as a brush bar extending along the axial direction of the outer skeleton.

7. The prefilter according to claim 1, wherein: The outer cleaning brush is configured as a flexible brush strip; and / or the outer cleaning brush is made of a flexible material.

8. The prefilter according to any one of claims 1 to 7, characterized in that The pre-filter further comprises a mounting portion, wherein the mounting portion is arranged on the outer frame, and the outer cleaning brush is arranged on a side of the mounting portion facing the inner wall of the water filter chamber.

9. The prefilter according to claim 8, characterized in that A receiving groove is provided on one side of the mounting portion facing the inner wall of the water filter cavity. The external cleaning brush is arranged in the receiving groove and partially protrudes from the receiving groove.

10. The pre-filter according to claim 9, characterized in that At least the corners of the notch of the accommodating groove are chamfered.

11. The prefilter according to claim 8, wherein The extension direction of the outer cleaning brush is parallel to the axial direction of the outer skeleton; and / or, The mounting portion is detachably mounted on the outer frame.

12. The pre-filter according to claim 8, wherein The outer frame is provided with an installation hole for the installation portion to be inserted, and one side of the installation portion is provided with a limiting rib extending along the circumference of the outer frame.

13. The pre-filter according to claim 12, wherein: The limiting rib is configured as an arc segment, and the arc segment is parallel to the circumference of the exoskeleton, or the radius of the arc segment is greater than or equal to 22 mm and less than or equal to 30 mm.

14. A water system, characterized in that: The method comprises the pre-filter according to any one of claims 1 to 13.

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