Pre-filter and water system

Abstract

The invention discloses a pre-filter and a water consuming system, and relates to the technical field of filters, the pre-filter comprises a shell and a filter assembly, and the shell is provided with a water filtering cavity; the filtering assembly is arranged in the water filtering cavity, the filtering assembly is provided with a filtering face extending in the radial direction, the filtering face is provided with an inner edge and an outer edge which are arranged in the radial direction of the filtering assembly, and at least part of the outer edge is located on the axial side of the inner edge; 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, a cleaning part is arranged on the inner cleaning brush, the cleaning part extends in the axial direction of the outer framework, and the cleaning part and the filtering face are correspondingly arranged so as to clean the filtering face; according to the technical scheme provided by the invention, the cleaning effect of the pre-filter on the filtering assembly can be improved, and the service life of the pre-filter is prolonged.

Description

Technical Field

[0001] The invention 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, the requirements for daily water use are getting higher and higher. Due to long-term disrepair and aging of the tap water pipes, there are a lot of large particles in the water that are harmful to the human body, such as silt, rust, and red worms, which seriously affect the health of residents' water use. Therefore, a pre-filter is set up, which has a filter component and other structures inside, which can filter large particles before the tap water is used at the faucet.

[0003] However, while the pre-filter is filtering water, impurities will adhere to the water filter cavity, especially the surface of the filter component, which will clog the filter component over time and reduce the filtering effect of the filter component. Therefore, a cleaning structure is usually provided to clean the filter component, but the cleaning structure in the prior art is often not designed reasonably, resulting in limited cleaning effect of the filter component. Summary of the invention

[0004] The main purpose of the present invention is to provide a pre-filter and a water system, aiming to improve the cleaning effect of the pre-filter on the filter component and to increase the service life of the pre-filter.

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

[0006] The housing has a water filtering cavity;

[0007] A filter assembly is disposed in the water filter cavity, wherein the filter assembly has a filter surface extending in a radial direction, and the filter surface has an inner edge and an outer edge arranged in a radial direction of the filter assembly, and at least a portion of the outer edge is located on an axial side of the inner edge; and

[0008] An exoskeleton is disposed in the water filter cavity and is rotatably mounted on the outer periphery of the filter assembly. An inner cleaning brush protruding along a first direction is installed on the inner side of the exoskeleton, and a cleaning portion is provided on the inner cleaning brush. The cleaning portion extends in the axial direction of the exoskeleton and is arranged corresponding to the filter surface to clean the filter surface.

[0009] In one embodiment, the cleaning portion is at least located on a side portion where the inner cleaning brush is distributed in the axial direction of the filter assembly and is parallel to the axial direction of the outer skeleton.

[0010] In one embodiment, the cleaning portion has a cleaning surface facing the filter assembly, and the angle between the cleaning surface and the first direction is greater than or equal to 10° and less than or equal to 12°.

[0011] In one embodiment, the angle between the cleaning surface and the first direction is 10.8°.

[0012] In one embodiment, an angle between the side of the cleaning portion facing the filter surface and the filter surface is greater than or equal to -2° and less than or equal to 2°.

[0013] In one embodiment, the cleaning portion and the filter surface are in interference contact; and / or,

[0014] The interference between the cleaning portion and the filtering surface is 0.2 mm to 0.4 mm.

[0015] In one embodiment, the cleaning portion extends along the circumferential direction of the outer frame and is inclined relative to the axial direction of the outer frame.

[0016] In one embodiment, the cleaning portion and the filter surface are in interference contact; and / or,

[0017] The interference between the cleaning portion and the filtering surface is 0.8 mm to 1.2 mm.

[0018] In one embodiment, a plurality of the cleaning parts and the filter surface are correspondingly distributed in the axial direction of the outer frame, and the plurality of cleaning parts are arranged obliquely relative to the axial direction of the outer frame along the same circumferential direction of the outer frame.

[0019] In one embodiment, the cleaning portion and the filter surface are distributed in a plurality in the axial direction of the outer frame correspondingly;

[0020] The two adjacent cleaning parts are arranged at an acute angle; and / or the angle between the two adjacent cleaning parts is 60° to 80°.

[0021] In one embodiment, the side portion of the cleaning portion distributed in the axial direction of the outer frame is inclined, and the filtering surface is in a corresponding annular cone shape.

[0022] In one embodiment, the cleaning portion has a width greater than or equal to 4 mm and less than or equal to 6 mm.

[0023] In one embodiment, the inner cleaning brush further comprises a base portion, the base portion is protruded along a first direction on an inner peripheral side of the outer frame, and the cleaning portion is connected to an outer peripheral side of the base portion.

[0024] In one embodiment, the cleaning portion includes a plurality of brush strips spaced apart along a first direction; or,

[0025] The cleaning portion is configured as a brush sheet extending along the first direction.

[0026] In one embodiment, the filter assembly includes a filter element, the filter surface is provided on the filter element, the filter element is provided in a ring-conical shape, and the cone angle of the filter element is greater than or equal to 150° and less than or equal to 170°.

[0027] In one embodiment, the filter assembly includes a supporting frame, and the supporting frame is provided with an inclined supporting portion, and the filter assembly is provided with a filter element corresponding to each supporting frame, the filter element is arranged in a ring shape, and has an inner ring edge and an outer ring edge, the outer ring edge is located on one axial side of the inner ring edge, and the filter element is arranged on the inclined supporting portion to form the filter surface.

[0028] In one embodiment, the filter assembly includes a plurality of the support frames arranged along the second direction, and the inner ring edges and the outer ring edges of two adjacent filter elements are arranged in opposite directions along the second direction.

[0029] In one embodiment, the filter assembly includes a plurality of filter modules, each of the filter modules includes two support frames, and the two filter elements of the same filter module are arranged to be tapered in opposite directions.

[0030] In one embodiment, the supporting skeleton further includes a first ring portion and a second ring portion, the outer diameter of the second ring portion is larger than the outer diameter of the first ring portion, the two ends of the oblique supporting portion are respectively connected to the first ring portion and the second ring portion, and the cleaning portion is located between the first ring portion and the second ring portion.

[0031] In one embodiment, the filter assembly includes a plurality of filter modules connected in sequence along the second direction, the outer skeleton is provided with a plurality of internal cleaning brushes, the plurality of internal cleaning brushes include a first internal cleaning brush and / or a second internal cleaning brush, the first internal cleaning brush is provided with a cleaning portion, and the second internal cleaning brush is provided with two cleaning portions extending in opposite directions in the axial direction of the outer skeleton.

[0032] The present invention also provides a water use system, comprising the pre-filter as described above.

[0033] The technical solution of the present invention is to set a water filter cavity in the shell, and the filter assembly and the outer frame are both arranged in the water filter cavity. The filter assembly has a filter surface extending in the radial direction, and the filter surface has an inner edge and an outer edge arranged in the radial direction of the filter assembly, and at least part of the outer edge is located on the axial side of the inner edge, so that under the same axial height, the filter area of ​​the filter assembly can be increased, which means that under the same flow rate, the filter assembly of this solution can withstand a larger flow load and improve the filtering efficiency. The outer frame can be rotatably sleeved on the outer periphery of the filter assembly, and an inner cleaning brush is installed on the inner side of the outer frame, and a cleaning part is provided on the inner cleaning brush, and the cleaning part extends in the axial direction of the outer frame, that is, the cleaning part is arranged on the side of the inner cleaning brush, and the cleaning part is arranged corresponding to the filter surface to clean the filter surface, thereby reducing sanitary dead corners and increasing the cleaning area of ​​the filter assembly by the inner cleaning structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0035] Figure 1 A cross-sectional view of the assembly structure of the exoskeleton and the filter assembly in an embodiment of the pre-filter provided by the present invention;

[0036] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0037] Figure 3 for Figure 1 Schematic diagram of the structure of the meso-exo-skeleton;

[0038] Figure 4 for Figure 1 Structural schematic diagram of the middle and inner cleaning structure;

[0039] Figure 5 for Figure 4 A partial enlarged view of point B in the middle;

[0040] Figure 6 A schematic diagram of the structure of an inner cleaning brush in another embodiment of the pre-filter provided by the present invention;

[0041] Figure 7 for Figure 6 A partial enlarged view of point C in the middle;

[0042] Figure 8A cross-sectional view of the assembly structure of the exoskeleton and the filter assembly in another embodiment of the pre-filter provided by the present invention;

[0043] Fig. 9 for Figure 8 Schematic diagram of the structure of the meso-exo-skeleton;

[0044] Fig.10 for Figure 8 Structural schematic diagram of the inner and outer cleaning structure;

[0045] Fig.11 for Figure 1 A schematic diagram of the structure of the filter assembly;

[0046] Fig.12 for Figure 1 Exploded diagram of the filter module;

[0047] Fig.13 for Figure 1 The structural diagram of the filtering module;

[0048] Fig.14 for Figure 1 Schematic diagram of the structure of the middle support skeleton.

[0049] Description of Figure Numbers:

[0050] 1. External frame; 11. Internal cleaning brush; 111. Cleaning part; 112. Base part; 113. Brush strip; 114. Brush sheet; 116. First internal cleaning brush; 117. Second internal cleaning brush; 30. Filter assembly; 300. Filter module; 310. Support frame; 311. Oblique support part; 312. First ring part; 313. Second ring part; 320. Filter element; 321. Inner ring edge; 322. Outer ring edge.

[0051] 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

[0052] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0053] 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 indication will also change accordingly.

[0054] 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 used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. 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 contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0055] Water use systems, such as whole-house water purification systems, are usually equipped with pre-filters, which are used to filter large particles in tap water. This not only ensures the safety of residents' water use, but also extends the service life of home appliances, prevents blockage of household water pipes, and improves the health of residents. The pre-filter is the first coarse filtration device in the whole-house water purification system. It is a physical filtration device that is mainly used to intercept large particles larger than 40 microns to protect the safety of back-end water use.

[0056] The present invention proposes a pre-filter, which has a filtering mode and a flushing mode. In the filtering mode, the pre-filter can filter large particles before the water end is used. In the flushing mode, the pre-filter can clean the filter component 30 inside it to discharge the large particles previously intercepted, thereby eliminating the need for manual disassembly and cleaning of the pre-filter, thereby increasing the service life of the pre-filter.

[0057] See also Figure 1 , Figure 2 and Figure 8 In one embodiment of the present invention, the pre-filter comprises a housing having a water filter cavity. Without loss of generality, the housing comprises a valve head and a filter bottle, the filter bottle forms a water filter cavity, the valve head is provided with a water inlet and a water outlet communicating with the water filter cavity, and the filter bottle is provided with a sewage outlet on a side away from the valve head.

[0058] The water inlet is connected to the water supply end of the water use system, and the water outlet is connected to the water use end of the water use system, thereby filtering the raw water flowing from the water supply end to the water use end. It should be noted that the water supply end can be a water pipe, a water tower or a well water, and the water use end can be a faucet, a shower or a drinking water outlet, and this application does not make specific limitations on this.

[0059] The connection between the valve head and the filter bottle can be threaded. For example, the valve head is provided with an external threaded tube, and the mouth of the filter bottle is provided with an internal thread for the external threaded tube to be threaded. In order to reduce the production difficulty of the pre-filter and the inspection requirements of the assembly results, as well as to reduce the material cost of the valve head, in this embodiment, the filter bottle and the valve head are connected by a fastener. The fastener can be a bolt, and the filter bottle and the valve head are locked by the threaded cooperation between the bolt and the through hole; the fastener can also be an assembly of a bolt and a nut, and the bolt is locked with the nut after passing through the through hole; the fastener can also be an assembly of a pin and a pin shaft, and the pin is passed through the through hole and the pin shaft is passed through the pin to lock the filter bottle and the valve head.

[0060] The valve head includes a metal shell part and a plastic lining part connected to each other, and the water inlet and the water outlet are both formed on the plastic lining part. The metal shell part of the valve head and the filter bottle are connected by fasteners. In this way, the water flowing through the pre-filter directly contacts the plastic lining part instead of the metal shell part, which can avoid the problem of water being contaminated by metal elements precipitated from the metal shell part, and can also make the pre-filter have good aesthetics and shell strength. In other embodiments, the valve head can also be directly configured as a metal part.

[0061] The materials of the metal outer shell and the plastic inner lining are not specifically limited in this application. For example, the material of the metal outer shell may be a copper alloy, such as brass, and the material of the plastic inner lining may be PP (polypropylene) or PVC (polyvinyl chloride).

[0062] The pre-filter also includes a filter assembly 30 arranged in the water filter chamber. A corresponding filter structure is arranged on the filter surface of the filter assembly 30. The 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 water inlet from the external water source, it can flow through the filter assembly 30. When the raw water flows through the filter surface, large particles of impurities in the raw water can be filtered, thereby removing some precipitated impurities, rust, sand, mud, bacteria and other particulate impurities generated in the pipeline, thereby providing better protection for water purifiers, washing machines, showers, high-end faucets, downstream pipelines, etc., and reducing the risk of damage to these equipment due to clogging by impurities.

[0063] The pre-filter also includes an exoskeleton 1 and a cleaning structure arranged on the exoskeleton 1. The exoskeleton 1 is sleeved outside the filter assembly 30. The internal cleaning brush 11 of the cleaning structure is convexly arranged on the inner circumference of the exoskeleton 1. The exoskeleton 1 and the filter assembly 30 can rotate relative to each other. In this way, through the relative rotation of the exoskeleton 1 and the filter assembly 30, the internal cleaning brush 11 can scrub the circumference of the filter surface in all directions to sweep away impurities attached to the filter surface, thereby avoiding clogging of the filter structure at the filter surface to ensure the filtering performance and service life of the filter assembly 30. Among them, the cleaning part 111 can be an elastic material such as silicone, rubber, etc., or a flexible material such as a brush. In this way, the cleaning part 111 can have a certain deformation ability to improve the adaptability of the cleaning part 111 to the filter surface, so that the cleaning part 111 and the filter surface can be closely abutted, and the cleaning part 111 can also better clean the filter surface comprehensively.

[0064] The pre-filter is usually a "T"-shaped structure. The "horizontal" position on the top corresponds to the valve head, and the left and right ends are the water inlet and outlet respectively. The main body of the "vertical" position on the bottom is the filter bottle, and the sewage outlet is located on the lower side of the filter bottle.

[0065] It can be understood that the pre-filter has a filtering mode and a flushing mode. In the filtering mode of the pre-filter, the water inlet and the water outlet are both open, the sewage outlet is closed, and the raw water flows into the water filter chamber from the water inlet, and then in the process of flowing to the water outlet, it will flow through the filter assembly 30, and thus be filtered by the filter assembly 30, thereby achieving the filtration of the raw water; in the flushing mode of the pre-filter, the water inlet and the sewage outlet are both open, and the water outlet is closed. After the raw water flows into the water filter chamber from the water inlet, it can entrain the impurities in the water filter chamber, part of which is also the impurities swept off the filter assembly 30 by the internal cleaning brush 11, and the sewage is finally discharged from the pre-filter from the sewage outlet, thereby achieving the flushing of the pre-filter.

[0066] Without loss of generality, the filter assembly 30 is fixedly installed in the water filter chamber, and the exoskeleton 1 is rotatably disposed in the water filter chamber. The exoskeleton 1 can be rotated to disturb the water flow in the water filter chamber to avoid the deposition of impurities, so that the water flow can better entrain the impurities to discharge them, thereby ensuring the cleanliness of the pre-filter and ensuring the filtering effect of the pre-filter.

[0067] In the technical solution of the present invention, the filter assembly 30 has a filter surface extending in the radial direction, and the filter surface has an inner edge and an outer edge arranged in the radial direction of the filter assembly 30, and at least part of the outer edge is located on one axial side of the inner edge;

[0068] An inner cleaning brush 11 is installed on the inner side of the outer frame 1 , and a cleaning portion 111 is provided on the inner cleaning brush 11 . The cleaning portion 111 extends in the axial direction of the outer frame 1 , and the cleaning portion 111 is arranged corresponding to the filter surface to clean the filter surface.

[0069] Specifically, the filter assembly 30 has a filter surface extending in the radial direction, that is, the filter surface of the filter assembly 30 is set at an angle with the axial direction of the filter assembly 30, and the cleaning portion 111 of the internal cleaning brush 11 in the prior art is usually arranged at the end of the internal cleaning brush 11 away from the outer frame 1, and is convex to the inner side of the outer frame 1, that is, the extension direction of the cleaning portion 111 is roughly parallel to the filter surface of the filter assembly 30 in this solution or has a small angle, resulting in the cleaning effect of the cleaning portion 111 on the filter surface is limited, resulting in the presence of sanitary dead corners on the surface of the filter assembly 30 that are difficult to clean, and long-term attachment of impurities not only affects the filtering effect of the filter assembly 30, but also easily causes bacterial growth. Therefore, an internal cleaning brush 11 is provided, and a cleaning portion 111 is provided on the internal cleaning brush 11, extending in the axial direction of the outer frame 1 to correspond to the filter surface, so as to effectively clean the filter surface and reduce sanitary dead corners.

[0070] It should be noted that the filter assembly 30 may only have a filter surface extending in the radial direction, without a filter surface extending in the axial direction, or may have both a filter surface extending in the radial direction and a filter surface extending in the axial direction. Correspondingly, the internal cleaning structure may only include an internal cleaning brush 11 with a cleaning portion 111 disposed on the axial side thereof, or may include an internal cleaning brush 11 with a cleaning portion 111 disposed on the axial side thereof, or may include an internal cleaning brush 11 with a cleaning portion 111 disposed on the axial end thereof. The filter surface extending in the radial direction of the filter assembly 30 may not be in the shape of a plane, but may be a curved surface concave inwardly or outwardly, or may be formed by multiple folded surfaces. The filter surface may not necessarily be completely parallel to the radial direction of the filter assembly 30, but may have a certain angle with at least the radial direction of the filter assembly 30.

[0071] In this embodiment, the filter surface has an inner edge and an outer edge arranged along the radial direction of the filter assembly 30, and at least part of the outer edge is located on the axial side of the inner edge. The inner edge of the filter surface is also the side of the filter surface close to the central axis of the filter assembly 30, and the outer edge of the filter surface is also the side of the filter surface close to the outer frame 1. The outer edge is located on the axial side of the inner edge, that is, the outer edge and the inner edge are not at the same height in the axial direction, that is, the filter surface is inclined. Under the axial condition of the same height, the filter area of ​​the filter assembly 30 can be increased, which means that under the same flow rate, the filter assembly 30 of this solution can withstand a larger flow load and improve the filtering efficiency. Moreover, since the filter area of ​​the filter assembly 30 of this solution is large enough, even if a local area of ​​the filter assembly 30 is blocked, the remaining area of ​​the filter assembly 30 can continue to withstand a larger flow load, which helps to extend the service life of the filter assembly 30, reduce the replacement frequency, and thus reduce the maintenance cost. The inclined filter surface can reduce the possibility of impurities accumulating on the filter surface.

[0072] In one embodiment, the cleaning portion 111 is located on the side of the inner cleaning brush 11 distributed in the axial direction of the filter assembly 30 and is parallel to the axial direction of the outer skeleton; that is, the cleaning portion 111 is arranged on the side of the inner cleaning brush 11 and is parallel to the axial direction of the filter assembly 30, so that the cleaning portion 111 is arranged opposite to the filter surface, so that the cleaning portion 111 can directly clean the radially extending filter surface of the filter assembly 30, thereby reducing sanitary dead corners and increasing the cleaning area of ​​the filter assembly 30 by the internal cleaning structure.

[0073] See also Fig.14 In an embodiment of the present invention, the filter assembly 30 includes a filter element 320, a filter surface is provided on the filter element 320, the filter element 320 is provided in an annular cone shape, and the cone angle of the filter element 320 is greater than or equal to 150° and less than or equal to 170°. Specifically, the filter element 320 is laid in an annular shape along the radial direction of the filter assembly 30, so as to filter the water flow in the water filter cavity, and the filter surface is formed on the surface of the filter element 320. The filter element 320 is provided in an annular cone shape, so that the filter surface is provided in a conical surface. The design of the conical surface is conducive to the uniform distribution and smooth flow of the fluid, reduces the eddy current and turbulence of the fluid inside the filter module 300, and reduces the energy loss.

[0074] The cone angle of the filter element 320 is greater than or equal to 150° and less than or equal to 170°. Assuming that the cone angle of the filter element 320 is β, 150°≤β≤170°, the cone angle in this range can provide a larger water flow space between the filter assembly 30 and the outer skeleton 1, so that the flow area of ​​the filter element 320 can be increased while reducing the axial space occupied by the filter element 320 in the filter bottle. Moreover, when the filter assembly 30 of the pre-filter is formed by a plurality of filter modules 300, the filter element 320 is arranged in the filter module 300, and the cone angle in this range can provide a larger water flow space between two adjacent filter modules 300 or between the filter module 300 and the environmental element, and at the same time can ensure the filtration area of ​​the filter element 320, thereby improving the filtration efficiency of the filter assembly 30. Specifically, the cone angle of the filter element 320 can be 150°, 152°, 155°, 157°, 160°, 162°, 165°, 167°, 170°, etc.

[0075] For the corresponding Figure 1 , Figures 4 to 7, the cleaning portion 111 has a cleaning surface facing the filter assembly 30, and the angle between the cleaning surface and the first direction is greater than or equal to 10° and less than or equal to 12°. Specifically, let the angle between the cleaning surface and the first direction (the axis of the base portion 112) be α. If the angle between the cleaning surface and the axis of the base portion 112 is greater than 12°, the difference between the length of the side of the cleaning portion 111 away from the filter assembly 30 and the length of the side of the cleaning portion 111 close to the filter assembly 30 is too large, that is, the inclination of the cleaning surface is too large, which may cause the inclination angle between the cleaning surface of the cleaning portion 111 and the filter surface to be too large, affecting the cleaning effect. If the angle between the cleaning surface and the axis of the base portion 112 is less than 10°, that is, the inclination of the side of the cleaning portion 111 facing the filter assembly 30 is too small, it may also cause the inclination angle between the cleaning surface of the cleaning portion 111 and the filter surface to be too large, affecting the cleaning effect, and is not conducive to the cleaning effect at the outer edge corner of the filter assembly 30. Specifically, the angle between the cleaning surface and the axis of the base 112 may be 10°, 10.3°, 10.5°, 10.8°, 11°, 11.3°, 11.5°, 11.8°, 12°, etc. Preferably, the angle between the first direction and the second direction is 10.8°.

[0076] Among them, the cleaning surface is arc-shaped or stepped, and the average plane formed by multiple connecting lines of the free end of the cleaning part 111 on the side close to the filter assembly 30 (the end of the cleaning part 111 away from the base part 112) and one end of the cleaning part 111 on the side close to the filter assembly 30 is used as the contour line of the side of the cleaning part 111 away from the base part 112.

[0077] Preferably, the angle between the cleaning portion 111 and the filter surface facing the filter surface is greater than or equal to -2° and less than or equal to 2°, that is, the absolute value of the angle between the cleaning portion 111 and the filter surface facing the filter surface is greater than or equal to 0° and less than or equal to 2°, that is, the absolute value of the angle between the cleaning surface and the filter surface is greater than or equal to 0° and less than or equal to 2°. If the absolute value of the angle between the contour line of the cleaning portion 111 away from the base portion 112 and the filter surface is greater than 2°, the edge position (inner edge or outer edge) of the filter surface may be difficult to contact with the cleaning portion 111, so that the edge position of the filter surface cannot be cleaned, thereby forming a sanitary dead corner; or at the edge position (inner edge or outer edge) of the filter surface, the insertion depth of the cleaning portion 111 is too large, which may affect the rotation of the filter assembly 30 relative to the cleaning brush. Specifically, the angle between the cleaning portion 111 and the filter surface facing the filter surface can be -2°, -1°, 0°, 1°, 2°, etc.

[0078] To further ensure the cleaning effect of the filter assembly 30, in the embodiment of the present invention, please refer to Figure 1 and Figure 2The cleaning portion 111 and the filter surface are in interference fit, so that the cleaning portion 111 has a certain friction force on the filter assembly 30, thereby ensuring the cleaning effect without affecting the relative movement of the cleaning portion 111 and the filter assembly 30.

[0079] In another embodiment of the present invention, the interference between the cleaning portion 111 and the filter surface is greater than or equal to 0.2 mm and less than or equal to 0.4 mm. That is, the cleaning portion 111 extends into the filter surface toward one side of the filter surface, thereby improving the cleaning effect. The depth of the cleaning portion 111 extending into the filter surface is greater than 0.4 mm, and the friction of the cleaning portion 111 relative to the filter assembly 30 is too large, and the cleaning portion 111 and the filter assembly 30 may be damaged, or the rotation of the cleaning portion 111 relative to the filter assembly 30 may be affected, thereby affecting the service life of the pre-filter; if the depth of the cleaning portion 111 extending into the filter assembly 30 is less than 0.2 mm, the friction of the cleaning portion 111 relative to the filter assembly 30 is too small, which may cause the friction of the cleaning portion 111 relative to the filter surface to be insufficient, resulting in inadequate cleaning of the filter surface, affecting the cleaning effect of the pre-filter. Specifically, the depth of the cleaning portion 111111 extending into the filter assembly 302 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.

[0080] See also Figures 8 to 10 In another embodiment of the present invention, the cleaning portion 111 extends obliquely along the circumference of the exoskeleton 1 relative to the axial direction of the exoskeleton 1. In this way, the deformation capacity of the cleaning portion 111 in the axial direction of the exoskeleton 1 can be improved, the cleaning portion 111 and the filter surface will abut and cooperate in the axial direction of the exoskeleton 1, and the cleaning portion 111 is easy to deform in the abutment and cooperation direction of the two, which is conducive to reducing the pressure between the cleaning portion 111 and the filter surface, thereby reducing the friction between the cleaning portion 111 and the filter surface when the exoskeleton 1 and the filter assembly 30 rotate relative to each other. It can be understood that the direction in which the cleaning portion 111 is inclined is conducive to its deformation. In this embodiment, the exoskeleton 1 rotates in the circumferential direction, and the cleaning portion 111 is easy to deform in the circumferential direction of the exoskeleton 1, which is conducive to further reducing the friction between the cleaning portion 111 and the filter surface to ensure the smooth rotation of the exoskeleton 1. In addition, the cleaning portion 111 can more easily cover more area on the filter surface, which is conducive to improving the cleaning effect of the cleaning portion 111 on the filter surface.

[0081] In one embodiment, there are multiple cleaning structures distributed in the circumferential direction of the exoskeleton 1. It can be that each cleaning structure is provided with the same number of cleaning parts 111 corresponding to the number of filter surfaces, so that each filter surface will be cleaned by the cleaning parts 111 of multiple cleaning structures distributed in the circumferential direction, which is beneficial to ensure the cleaning effect of the filter assembly 30. Of course, it can also be that a cleaning structure is only provided with a cleaning part 111 for part of the filter surface, and the cleaning parts 111 are staggered in multiple cleaning structures distributed in the circumferential direction, so that each filter surface is provided with at least one cleaning part 111. In this way, under the premise of ensuring the coverage of the filter surface by the cleaning structure, the friction between the cleaning part 111 and the filter surface can also be dispersed in the circumferential direction, which is beneficial to ensure the stability and smoothness of the rotation of the exoskeleton 1.

[0082] The plurality of cleaning parts 111 are arranged along the same circumferential direction of the exoskeleton 1 and are inclined relative to the axial direction of the exoskeleton 1. In this way, the inclination direction of the cleaning parts 111 can be conveniently set according to the rotation direction of the exoskeleton 1 to reduce the friction between the cleaning parts 111 and the cleaning surface, thereby ensuring the smooth rotation of the exoskeleton 1. For example, when the exoskeleton 1 needs to rotate clockwise, each cleaning part 111 is inclined in the counterclockwise direction.

[0083] In one embodiment, for a plurality of cleaning sections 111 located at the same axial position, an acute angle is formed between two adjacent cleaning sections 111. In this way, the spatial arrangement of the plurality of cleaning sections 111 can be facilitated, and at the same time, it is beneficial to ensure that the cleaning section 111 covers the filter surface in the axial direction. Among them, the angle between the two adjacent cleaning sections 111 is preferably 60 to 80 degrees. That is, the angle between the two 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 angle between the two adjacent cleaning sections 111 can also be adjusted to a range less than 60 degrees or a range greater than 80 degrees.

[0084] In one embodiment, the cleaning portion 111 and the filter surface are in interference contact. In this way, the cleaning portion 111 can clean the impurities on the filter surface more deeply, so as to enhance the cleaning strength of the cleaning structure on the filter assembly 30, so as to ensure the filtering effect of the filter assembly 30 and improve the service life of the pre-filter. Specifically, the interference between the cleaning portion 111 and the filter surface is 0.8mm to 1.2mm. That is, the interference between the cleaning portion 111 and the filter surface is greater than or equal to 0.8mm and less than or equal to 1.2mm. In this way, the abutment degree between the cleaning portion 111 and the filter surface can be within a suitable range, while ensuring the cleaning strength of the cleaning portion 111 on the filter surface, the friction between the cleaning portion 111 and the filter surface will not be too large, avoiding excessive interference with the rotation of the exoskeleton 1, and also reducing the wear on the cleaning portion 111. Of course, in other embodiments, the interference between the cleaning portion 111 and the filter surface can also be adjusted to a range less than 0.8mm or a range greater than 1.2mm according to demand.

[0085] See also Figures 4 to 10 In the embodiment of the present invention, along the radial direction of the filter assembly 30, the width of the inner cleaning brush 11 is greater than or equal to 4 mm and less than or equal to 6 mm. Specifically, let the width of the cleaning portion 111 along the radial direction of the filter assembly 30 be D1 (hereinafter referred to as the width of the cleaning portion 111). If the width of the cleaning portion 111 is greater than 6 mm, the width of the cleaning portion 111 is too large and may exceed the width of the filter surface, thereby causing unnecessary cost waste; if the width of the cleaning portion 111 is less than 4 mm, the width of the cleaning portion 111 is too small and may be much lower than the width of the filter surface, thereby causing part of the filter surface of the filter assembly 30 to be unable to be cleaned. Therefore, the width of the cleaning portion 111 is set to be greater than or equal to 4 mm and less than or equal to 6 mm, thereby ensuring the cleaning effect of the cleaning portion 111 on the filter surface and reducing unnecessary cost waste. Preferably, the width of the cleaning portion 111 is equal to the width of the filter surface; or the width of the cleaning portion 111 is slightly greater than or slightly less than the width of the filter surface, such as the difference between the width of the cleaning portion 111 and the width of the filter surface is less than or equal to 1 mm. Specifically, the width of the cleaning portion 111 may 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, or the like.

[0086] In order to improve the compatibility of the cleaning portion 111 with the filter surface, in an embodiment of the present invention, the side portion of the cleaning portion 111 distributed in the axial direction of the outer skeleton 1 is inclined, and the filter surface is in a corresponding annular cone shape. The annular cone-shaped filter surface allows the space of the water filter cavity to be fully utilized, increasing the water flow area of ​​the filter assembly 30 and the area that can intercept impurities, thereby improving the filtering effect of the filter assembly 30. The side portion of the cleaning portion 111 used to clean the filter surface is set to an inclined shape corresponding to the filter surface, which can improve the fit between the cleaning portion 111 and the filter surface, and is conducive to improving the cleaning strength of the cleaning portion 111 on the filter surface, thereby ensuring the cleaning effect of the filter assembly 30 and ensuring the life of the pre-filter.

[0087] Preferably, the cleaning portion 111 is gradually expanded in the direction away from the filter assembly 30, that is, the length of the cleaning portion 111 becomes longer in the direction away from the filter assembly 30, because it is convenient to insert the inner cleaning brush 11, and the two filter surfaces arranged opposite to each other are often gradually expanded in their radial direction, so that the shape of the cleaning portion 111 is just adapted to the filter surface, ensuring the cleaning effect of the cleaning surface. The outer contour of the cleaning portion 111 of the cleaning assembly away from the base portion 112 can be linear, arc-shaped or stepped.

[0088] See also Figure 1 , Figure 3 , Figure 8 and Fig.10 In an embodiment of the present invention, the inner cleaning brush 11 further comprises a base portion 112 protruding from the inner circumference of the outer frame 1 along a first direction, and the cleaning portion 111 is connected to the outer circumference of the base portion 112. Specifically, the base portion 112 protrudes from the inner circumference of the outer frame 1, that is, the base portion 112 extends toward the inner side of the outer frame 1, wherein the base portion 112 may extend along the radial direction of the outer frame, and at this time, the first direction is parallel to the radial direction of the outer frame 1, and the base portion 112 may also be arranged at a certain angle to the radial direction of the outer frame 1, and the designer may arrange it accordingly according to the specific structure of the filter assembly 30.

[0089] The cleaning part 111 can be integrally formed with the base part 112, so as to facilitate the assembly of the cleaning part 111. Alternatively, the cleaning part 111 is fastened to the base part 112 by snapping, bonding or fasteners. The base part 112 can also be integrally formed with the outer frame 1, or installed on the outer frame 1 through a mounting part, and the base part 112 can be fastened to the outer frame 1 by snapping, bonding or fasteners.

[0090] See also Figure 4 and Figure 5In one embodiment, the cleaning portion 111 includes a plurality of brush strips 113 arranged at intervals along a first direction. Specifically, the plurality of brush strips 113 are arranged along the first direction, that is, along the extension direction of the base portion 112, so as to form a cleaning portion 111, thereby facilitating adjustment of the width of the cleaning portion 111. In the actual cleaning process, the cleaning portion 111 will be partially deformed when it moves relative to the filter assembly 30, and the plurality of brush strips 113 are arranged at intervals on the base portion 112, which can provide a certain space for the deformation of the brush strips 113, thereby helping to increase the deformation degree of the cleaning portion 111 and improve the cleaning effect.

[0091] See also Figure 6 , Figure 7 and Fig.10 In another embodiment, the cleaning portion 111 is configured as a brush sheet 114 extending along the first direction, that is, the cleaning portion 111 is configured as an integral body, thereby facilitating the processing of the cleaning portion 111 and the base portion 112 .

[0092] See also Figures 11 to 14 In an embodiment of the present invention, the filter assembly 30 includes a support frame 310, and the support frame 310 is provided with an inclined support portion 311. The filter assembly 30 is provided with a filter element 320 corresponding to each support frame 310. The filter element 320 is arranged in an annular shape and has an inner ring edge 321 and an outer ring edge 322. The outer ring edge 322 is located on one axial side of the inner ring edge 321. The filter element 320 is arranged on the inclined support portion 311 to form a filtering surface.

[0093] Specifically, the support frame 310 serves as the frame of the filter assembly 30 to ensure the structural strength of the filter assembly 30, and the oblique support portion 311 is mainly used to support the filter element 320, so that the installation of the filter element 320 is more stable. And the filter assembly 30 is provided with a filter element 320 corresponding to each support frame 310, that is, each filter element 320 can cover all water outlets formed on a support frame 310, so as to ensure the structural integrity of the filter element 320. The filter element 320 is arranged in an annular shape, with an inner ring edge 321 and an outer ring edge 322, and the outer ring edge 322 is located on one axial side of the inner ring edge 321, that is, the filter element 320 is arranged in an annular cone shape as a whole, and the corresponding support frame 310 is arranged in a roughly truncated cone shape, so as to facilitate the installation of the filter element 320.

[0094] Preferably, see Fig.11 and Fig.12 The inclined support portion 311 is configured as a plurality of support ribs arranged along the circumference of the filter assembly 30, and a water outlet is formed between two adjacent support ribs to facilitate the flow of water in the water filter cavity while ensuring sufficient water flow. The filter element 320 is arranged on the support ribs to facilitate the installation of the filter element 320.

[0095] Further, the support skeleton 310 also includes a first ring portion 312 and a second ring portion 313, the outer diameter of the second ring portion 313 is larger than the outer diameter of the first ring portion 312, the two ends of the oblique support portion 311 are respectively connected to the first ring portion 312 and the second ring portion 313, and the cleaning portion 111 is located between the first ring portion 312 and the second ring portion 313. Specifically, the outer diameter of the second ring portion 313 is larger than the outer diameter of the first ring portion 312, so the first ring portion 312 is arranged on the inner side of the second ring portion 313, and the first ring portion 312 and the second ring portion 313 can be used for installation between multiple support skeletons 310, thereby facilitating the overall assembly of the filter assembly 30. The two ends of the oblique support portion 311 are respectively connected to the first ring portion 312 and the second ring portion 313, and the cleaning portion 111 is located between the first ring portion 312 and the second ring portion 313, that is, the cleaning portion 111 is arranged corresponding to the oblique support portion 311, so as to facilitate the cleaning portion 111 to clean the filter surface and reduce unnecessary structural redundancy.

[0096] Further, the filter assembly 30 includes a plurality of support frames 310 arranged along the second direction, and the inner ring edges 321 and the outer ring edges 322 of two adjacent filter elements 320 are arranged in opposite directions along the second direction. Specifically, the inner ring edges 321 and the outer ring edges 322 of two adjacent filter elements 320 are arranged in opposite directions along the second direction, that is, the first ring portions 312 and the first ring portions 312 of two adjacent support frames 310 are connected to each other, or the second ring portions 313 and the second ring portions 313 of two adjacent support frames 310 are connected to each other, that is, the symmetrical arrangement of the two adjacent support frames 310, so that the filter surface of the support frame 310 is arranged opposite to the filter surface of one of the two adjacent support frames 310, and is arranged opposite to the other, so that a gradually expanding installation space is formed between the two oppositely arranged filter surfaces, so as to facilitate the insertion of the inner cleaning brush 11 and facilitate the inner cleaning brush 11 to clean the two filter surfaces at the same time.

[0097] Furthermore, the filter assembly 30 includes a plurality of filter modules 300, each filter module 300 includes two support frames 310, and the two filter elements 320 of the same filter module 300 are arranged to be gradually contracted in opposite directions. Specifically, each two adjacent support frames 310 form a filter module 300, and the second ring portions 313 of the two support frames of each filter module 300 are connected, and the first ring portions 312 of the two support frames between the two adjacent filter modules 300 are connected, so that the two filter elements 320 of the same filter module 300 are arranged to be gradually contracted in opposite directions. This facilitates the formation of a water passage cavity between the two filter elements 320, and facilitates the filter assembly 30 to filter the water flow in the water filtration cavity.

[0098] To facilitate the overall assembly of the filter assembly 30, in one embodiment, refer to Figure 1 and Figure 8 The filter assembly 30 includes a plurality of filter modules 300 connected in sequence along the second direction, the outer skeleton 1 is provided with a plurality of internal cleaning brushes 11, the plurality of internal cleaning brushes 11 include a first internal cleaning brush 116 and / or a second internal cleaning brush 117, the first internal cleaning brush 116 is provided with a cleaning portion 111, and the second internal cleaning brush 117 is provided with two cleaning portions 111 extending in opposite directions in the axial direction of the outer skeleton 1.

[0099] In this embodiment, the filter assembly 30 includes a plurality of filter modules 300 connected in sequence along the second direction, which is also the axial direction of the filter assembly 30. The plurality of internal cleaning brushes 11 include a first internal cleaning brush 116 and a second internal cleaning brush 117. The first internal cleaning brush 116 is provided with a cleaning portion 111, which is often arranged on one side of the axial end of the base portion 112. The second internal cleaning brush 117 is provided with two cleaning portions 111 extending in opposite directions in the axial direction of the outer skeleton 1, that is, cleaning portions 111 are provided on opposite sides of the second internal cleaning brush 117.

[0100] In this embodiment, the second ring parts 313 of the two support frames of each filter module 300 are connected, and the first ring parts 312 of the two support frames between two adjacent filter modules 300 are connected, so that the two filter elements 320 of the same filter module 300 are arranged to be tapered in opposite directions. At this time, the first cleaning brush is arranged at the opposite ends of the filter assembly 30, and is used to clean the single filter surface at the axial end of the filter assembly 30, which helps to reduce the length of the internal cleaning structure along the outer frame 1; the second cleaning brush is arranged between two adjacent filter modules 300, so as to clean the two opposite cleaning surfaces of the two filter modules 300 respectively, which helps to save the number of internal cleaning brushes 11 and reduce the space occupied by the internal cleaning structure inside the outer frame 1.

[0101] In another embodiment, the filter assembly 30 includes a plurality of filter modules 300 connected in sequence along the axial direction of the outer frame 1, each filter module 300 includes two support frames 310, and two filter elements 320 of the same filter module 300 are gradually expanded in opposite directions. At this time, the second cleaning brush extends into the adjacent filter module 300 and is located between the two filter units, so as to clean the two opposite cleaning surfaces of the filter module 300 respectively, which helps to save the number of internal cleaning brushes 11 and reduce the space occupied by the internal cleaning structure on the inside of the outer frame 1.

[0102] The present invention also proposes a water system, which includes a pre-filter. The specific structure of the pre-filter refers to the above embodiment. Since the water system adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Among them, the water system at least includes related components from the pre-filter to the water end. For example, the water system can include household appliances such as water heaters, dishwashers, and water dispensers, and can also include accessories such as water pipes for domestic water in the whole house.

[0103] The above are only exemplary embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied 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; A filter assembly is disposed in the water filter cavity, wherein the filter assembly has a filter surface extending in a radial direction, and the filter surface has an inner edge and an outer edge arranged in a radial direction of the filter assembly, and at least a portion of the outer edge is located on an axial side of the inner edge; and An exoskeleton is disposed in the water filter cavity and is rotatably mounted on the outer periphery of the filter assembly. An inner cleaning brush protruding along a first direction is installed on the inner side of the exoskeleton, and a cleaning portion is provided on the inner cleaning brush. The cleaning portion extends in the axial direction of the exoskeleton and is arranged corresponding to the filter surface to clean the filter surface.

2. The pre-filter according to claim 1, characterized in that: The cleaning portion is at least located at a side portion where the inner cleaning brush is distributed in the axial direction of the filter assembly and is parallel to the axial direction of the outer frame.

3. The pre-filter according to claim 2, characterized in that: The cleaning portion has a cleaning surface facing the filter assembly, and an angle between the cleaning surface and the first direction is greater than or equal to 10° and less than or equal to 12°.

4. The pre-filter according to claim 3, characterized in that: The angle between the cleaning surface and the first direction is 10.8°.

5. The pre-filter according to claim 2, characterized in that: The angle between the cleaning portion and the filtering surface and the side thereof facing the filtering surface is greater than or equal to -2° and less than or equal to 2°.

6. The pre-filter according to claim 2, characterized in that: The cleaning portion and the filtering surface are in interference contact; and / or, The interference between the cleaning portion and the filtering surface is 0.2 mm to 0.4 mm.

7. The pre-filter according to claim 1, characterized in that: The cleaning portion extends along the circumferential direction of the outer frame and is inclined relative to the axial direction of the outer frame.

8. The pre-filter according to claim 7, characterized in that: The cleaning portion and the filtering surface are in interference contact; and / or, The interference between the cleaning portion and the filtering surface is 0.8 mm to 1.2 mm.

9. The pre-filter according to claim 7, characterized in that: A plurality of the cleaning parts and the filter surfaces are distributed in the axial direction of the outer frame correspondingly, and the plurality of cleaning parts are arranged obliquely relative to the axial direction of the outer frame along the same circumferential direction of the outer frame.

10. The pre-filter according to claim 7, characterized in that: The cleaning parts and the filter surfaces are distributed in a plurality in the axial direction of the outer frame correspondingly; The two adjacent cleaning parts are arranged at an acute angle; and / or the angle between the two adjacent cleaning parts is 60° to 80°.

11. The pre-filter according to claim 1, characterized in that: The side portion of the cleaning portion distributed in the axial direction of the outer frame is inclined, and the filtering surface is in a corresponding annular cone shape.

12. The pre-filter according to claim 1, characterized in that: The width of the cleaning portion is greater than or equal to 4 mm and less than or equal to 6 mm.

13. The pre-filter according to claim 1, characterized in that: The inner cleaning brush further comprises a base portion, the base portion is protrudingly arranged on the inner peripheral side of the outer frame along a first direction, and the cleaning portion is connected to the outer peripheral side of the base portion.

14. The pre-filter according to claim 1, characterized in that: The cleaning portion includes a plurality of brush strips spaced apart along a first direction; or, The cleaning portion is configured as a brush sheet extending along the first direction.

15. The pre-filter according to claim 1, characterized in that: The filter assembly includes a filter element, the filter surface is arranged on the filter element, the filter element is arranged in a ring cone shape, and the cone angle of the filter element is greater than or equal to 150° and less than or equal to 170°.

16. The pre-filter according to claim 1, characterized in that: The filter assembly includes a supporting frame, and the supporting frame is provided with an inclined supporting portion. The filter assembly is provided with a filter element corresponding to each supporting frame. The filter element is arranged in an annular shape and has an inner ring edge and an outer ring edge. The outer ring edge is located on one axial side of the inner ring edge. The filter element is arranged on the inclined supporting portion to form the filtering surface.

17. The pre-filter according to claim 16, characterized in that: The filter assembly includes a plurality of support frames arranged along the second direction, and the inner ring edges and outer ring edges of two adjacent filter elements are arranged in opposite directions along the second direction.

18. The pre-filter according to claim 16, characterized in that: The filter assembly includes a plurality of filter modules, each of the filter modules includes two support frames, and the two filter elements of the same filter module are arranged to be tapered in opposite directions.

19. The pre-filter according to claim 16, characterized in that: The support frame also includes a first ring portion and a second ring portion, the outer diameter of the second ring portion is larger than the outer diameter of the first ring portion, the two ends of the oblique support portion are respectively connected to the first ring portion and the second ring portion, and the cleaning portion is located between the first ring portion and the second ring portion.

20. The pre-filter according to any one of claims 1 to 19, characterized in that: The filter assembly includes multiple filter modules connected in sequence along the second direction, the outer skeleton is provided with multiple internal cleaning brushes, the multiple internal cleaning brushes include a first internal cleaning brush and / or a second internal cleaning brush, the first internal cleaning brush is provided with one cleaning portion, and the second internal cleaning brush is provided with two cleaning portions extending in opposite directions in the axial direction of the outer skeleton.

21. A water system, characterized in that: The method comprises a pre-filter as claimed in any one of claims 1 to 20.

Images