Pre-filter and water system

Abstract

The invention discloses a pre-filter and a water system, and relates to the technical field of filters, the pre-filter comprises a valve head, a filter bottle and a filter assembly, the valve head is provided with a waterproof ring between a water inlet and a water outlet, the filter assembly comprises a water distributor and a plurality of filter modules which are connected in sequence, the water distributor is located on one side close to the valve head, and the filter bottle is located on the other side close to the valve head. A water passing cavity is formed in the filtering module, the filtering module is provided with a first water passing opening and a second water passing opening, the water distributor forms a first water passing space and a second water passing space, the second water passing space is annularly arranged outside the first water passing space, and the two axial sides of the first water passing space are communicated with the first water passing opening and the inner circumferential side of the water separation ring respectively. The two axial sides of the second water passing space communicate with the peripheral side of the waterproof ring and the second water passing opening correspondingly, and guide vanes inclined relative to the axial direction are arranged. According to the technical scheme, the filtering effect of the filtering assembly is guaranteed, 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 also getting higher and higher. Due to long-term disrepair and aging of the tap water pipes, there are a large number of large particles in the water that are harmful to the human body, such as mud, rust, and red worms, which seriously affect the health of residents' water use. Therefore, a pre-filter is set up, and a filter component and other structures are provided inside the pre-filter, which can filter large particles before the tap water is used at the faucet. However, while the pre-filter is filtering the water, impurities will adhere to the 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. Summary of the invention

[0003] The main purpose of the present invention is to provide a pre-filter and a water-using system, aiming to ensure the filtering effect of the filtering component and to increase the service life of the pre-filter.

[0004] To achieve the above object, the pre-filter proposed by the present invention comprises:

[0005] A valve head and a filter bottle, wherein the filter bottle is formed with a water filter cavity, the valve head is provided with a water inlet and a water outlet connected to the water filter cavity, and a water isolating ring is provided between the water inlet and the water outlet, the water inlet is connected to the outer peripheral side of the water isolating ring, the water outlet is connected to the inner peripheral side of the water isolating ring, and a sewage outlet connected to the water filter cavity is provided on a side of the filter bottle away from the valve head; and

[0006] A filter assembly is arranged in the water filter cavity, the filter assembly comprises a water distributor and a plurality of filter modules connected in sequence, the water distributor is located on a side close to the valve head;

[0007] A water passage cavity is formed inside the filter module, a first water passage port communicating with the water passage cavity is provided in the axial direction of the filter module, a second water passage port communicating with the water passage cavity is provided in the circumferential direction of the filter module, a filter element is provided in the second water passage port, the filter element is provided in an annular shape, and has an inner annular edge and an outer annular edge, and the outer annular edge is located on one axial side of the inner annular edge;

[0008] The water distributor forms a first water flow space and a second water flow space. The second water flow space is arranged outside the first water flow space. The axial sides of the first water flow space are respectively connected to the first water flow port and the inner circumference of the water isolation ring, and the axial sides of the second water flow space are respectively connected to the outer circumference of the water isolation ring and the second water flow port, and are provided with guide blades inclined relative to the axial direction.

[0009] In one embodiment, the pre-filter further comprises an exoskeleton, the exoskeleton is rotatably mounted outside the filter assembly, the exoskeleton comprises a side frame and a chassis, the chassis is connected to the side of the side frame away from the valve head.

[0010] In one embodiment, the outer frame is formed with a siphon channel, the side frame is provided with a siphon hole connected to the siphon channel, the chassis is provided with a first discharge port connected to the siphon channel, and the first discharge port is connected to the sewage outlet.

[0011] In one embodiment, an impeller assembly is also provided in the water filter chamber, and the impeller assembly includes a mounting seat and an impeller body rotatably mounted on the mounting seat, the impeller body is coaxially connected to the exoskeleton and fixed in the circumferential direction, and the mounting seat is formed with a first water inlet and a drain that are connected to each other, the first water inlet is connected to the first discharge port, and the drain port is connected to the sewage outlet.

[0012] In one embodiment, the mounting seat is further provided with a second water inlet, wherein the first water inlet is provided on one axial side of the mounting seat, and the second water inlet is provided on a circumferential side of the mounting seat;

[0013] The chassis is also provided with a second discharge port extending axially therethrough, and a water retaining structure is formed on opposite sides of the exoskeleton and the mounting seat. The water retaining structure is arranged around the first discharge port, and the second discharge port is located at the periphery of the water retaining structure. The second water inlet is connected to the second discharge port.

[0014] In one embodiment, the exoskeleton is provided with a water flow driving member, and the water flow driving member has a driving surface, and the driving surface is arranged at an angle relative to the circumference of the exoskeleton, so that the driving surface can drive the exoskeleton to rotate after being impacted by the water flow.

[0015] In one embodiment, the water flow driving component includes a hanging portion and a driving body, the hanging portion is hung on the end of the exoskeleton close to the water inlet, the driving body is arranged in a conformal manner with the inner circumferential wall of the exoskeleton, the driving body extends along the circumferential arc of the exoskeleton, and has a plurality of water baffles distributed at intervals, and the driving surface is formed on the water baffles.

[0016] In one embodiment, the exoskeleton is installed with a cleaning structure, and the cleaning structure includes an inner cleaning brush protruding from the inner circumference of the exoskeleton, and the inner cleaning brush includes a cleaning part, which extends in the axial direction of the exoskeleton, and the cleaning part is arranged corresponding to the filter element, and the cleaning part is used to clean the filter element.

[0017] In one embodiment, the cleaning portion extends obliquely relative to the axial direction of the outer frame.

[0018] 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.

[0019] In one embodiment, the inner cleaning brush further comprises a base portion, the base portion is protrudingly disposed on the inner circumference of the outer frame, and the cleaning portion is connected to the outer circumference of the base portion.

[0020] In one embodiment, one of the base parts is correspondingly provided with two cleaning parts extending in opposite directions in the axial direction of the outer frame.

[0021] In one embodiment, a plurality of cleaning parts are distributed in the axial direction of the outer frame, and one cleaning part is provided corresponding to one filter element.

[0022] In one embodiment, two adjacent cleaning portions are arranged at an acute angle therebetween.

[0023] In one embodiment, the angle between two adjacent cleaning portions is 60 degrees to 80 degrees.

[0024] In one embodiment, the cleaning portion is configured as a sheet-like structure.

[0025] In one embodiment, the cleaning portion has a thickness of 0.5 mm to 1 mm.

[0026] In one embodiment, the cleaning portion 911 is distributed on a side portion of the outer frame 50 in the axial direction and is inclined.

[0027] In one embodiment, the filter element is arranged 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°.

[0028] In one embodiment, the filter module includes two support frames distributed along the axial direction, the water passage cavity is formed between the two support frames, each support frame is provided with the second water passage, and the inner ring edge and the outer ring edge of two adjacent filter elements are distributed in opposite directions.

[0029] In one embodiment, the supporting skeleton includes an oblique supporting portion, the two ends of the oblique supporting portion are respectively connected to a first ring portion and a second ring portion, the two oblique supporting portions of the same filter module are connected through the second ring portion, the first water outlet is provided on the inner periphery of the first ring portion, and the second water outlet is provided on the oblique supporting portion.

[0030] In one embodiment, the oblique support portion is formed with a plurality of the second water outlets distributed at intervals, and the filter module is provided with a filter element corresponding to each of the support frames, and the filter element is stacked on the surface of the oblique support portion.

[0031] In one embodiment, an outer diameter of the second ring portion is greater than an outer diameter of the first ring portion.

[0032] In one embodiment, each of the supporting frames is provided with the second ring portion, the two second ring portions of the same filter module are detachably connected, and the first ring portions of two adjacent filter modules are detachably connected.

[0033] In one embodiment, the water distributor includes an annular protrusion protruding away from the filter module, the first water flow space is formed on the inner circumference of the annular protrusion, and the annular protrusion is plugged into the water isolation ring.

[0034] In one embodiment, the annular protrusion is inserted into the water isolating ring, and a sealing ring is disposed on the outer sleeve of the annular protrusion, and abuts against the inner circumferential wall of the water isolating ring through the sealing ring.

[0035] In one embodiment, the water distributor also includes a first connecting ring and a second connecting ring, the second connecting ring is arranged outside the first connecting ring, the second water flow space is formed between the first connecting ring and the second connecting ring, the annular protrusion is protruding from the first connecting ring and is connected to the first connecting ring in a step shape, and the first connecting ring abuts against the end face of the water-blocking ring.

[0036] The present invention also provides a water use system, comprising the aforementioned pre-filter.

[0037] In the technical solution of the present invention, at the same axial height, the filtering area of ​​the filter element can be increased, which means that at the same flow rate, the filter element of this solution can withstand a larger flow load and improve the filtering efficiency. Moreover, since the filtering area of ​​the filter element of this solution is large enough, even if a local area of ​​the filter element is clogged, the remaining area of ​​the filter element can continue to withstand a larger flow load, which helps to extend the service life of the filter module, reduce the replacement frequency, and thus reduce maintenance costs.

[0038] In the filtering mode, the water inlet and the water outlet are opened, and the sewage outlet is closed. The water entering the water inlet flows through the first water flow space into the water filter chamber, and then flows from the outer periphery of the filter component through the second water flow port of the filter component into the inner periphery of the filter component, thereby being filtered by the filter element. Impurities are intercepted by the filter element, and the filtered water flow will flow through the second water flow space to the inner periphery of the water isolation ring, and finally flow to the water outlet.

[0039] In the flushing mode, the water inlet and the sewage outlet are opened, and the water outlet is closed. The water entering the water inlet still enters the water filter chamber through the first water flow space. After the water flow flushes the surface of the filter element, the sewage will be discharged through the sewage outlet, thereby discharging the impurities previously intercepted, which can reduce the adhesion of impurities on the filter element, so as to ensure the filtering effect of the filter component and increase the service life of the pre-filter.

[0040] Among them, the guide blades arranged in the first water flow space enable the water flow entering the water filter chamber to form a vortex, so as to disturb the water flow and avoid the deposition of impurities. Especially in the flushing mode, the impurities can be better entrained in the water flow, thereby facilitating the discharge of impurities from the sewage outlet along with the water flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] 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.

[0042] Figure 1 A schematic diagram of the external structure of an embodiment of a pre-filter provided by the present invention;

[0043] Figure 2 A schematic cross-sectional structure diagram of an embodiment of a pre-filter provided by the present invention;

[0044] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0045] Figure 4 for Figure 2 A partial enlarged view of point B in the middle;

[0046] Figure 5 A schematic structural diagram of an embodiment of a filter assembly of a pre-filter provided by the present invention;

[0047] Figure 6 for Figure 5 An exploded structural diagram of an embodiment of a filtering module in FIG.

[0048] Figure 7 for Figure 5 A schematic diagram of the connection structure of two filter modules in an embodiment;

[0049] Figure 8 for Figure 5 A schematic diagram of the connection structure of another embodiment of two filter modules;

[0050] Fig. 9A schematic structural diagram of an exoskeleton of a pre-filter provided by the present invention from a first perspective of an embodiment;

[0051] Fig.10 for Fig. 9 A schematic diagram of the structure of the exoskeleton from another perspective;

[0052] Fig.11 A schematic structural diagram of an impeller assembly of an embodiment of a pre-filter provided by the present invention;

[0053] Fig.12 for Fig.11 A schematic diagram of the structure of the impeller assembly from another perspective;

[0054] Fig.13 for Fig.11 A schematic structural diagram of an impeller body in an impeller assembly according to an embodiment of the present invention;

[0055] Fig.14 for Fig. 9 A schematic cross-sectional view of an embodiment of an exoskeleton;

[0056] Fig.15 A schematic diagram of the coordination state of a cleaning structure of a pre-filter and a filter assembly according to an embodiment of the present invention;

[0057] Fig.16 A schematic diagram of the structure of a cleaning structure of a pre-filter provided by the present invention from a first perspective;

[0058] Fig.17 for Fig.16 Clean structure in other perspectives of the structure diagram;

[0059] Fig.18 A schematic diagram of the assembly structure of a cleaning structure and an outer frame of a pre-filter provided by the present invention;

[0060] Fig.19 A schematic structural diagram of an embodiment of a valve head of a pre-filter provided by the present invention.

[0061] Description of Figure Numbers:

[0062] 10. filter bottle; 101. water filter chamber; 102. sewage outlet;

[0063] 20. Valve head; 21. Metal shell; 22. Plastic lining; 201. Water inlet; 202. Water outlet; 210. Water isolation ring;

[0064] 30. Filter assembly; 300. Filter module; 301. First connection structure; 302. Second connection structure;

[0065] 310, support frame; 311, oblique support portion; 312, first ring portion; 313, second ring portion; 320, filter element; 330, first water outlet; 340, water passage cavity; 350, second water outlet;

[0066] 40, impeller assembly; 410, mounting seat; 402, first water inlet; 403, second water inlet; 404, drain outlet; 424, water retaining ring;

[0067] 440, impeller body; 441, impeller shaft; 442, impeller blades;

[0068] 50, outer frame; 501, siphon flow channel; 503, first discharge port; 504, second discharge port;

[0069] 511, chassis; 512, side frame; 514, water retaining ring; 531, siphon hole;

[0070] 540, water flow driving member; 541, hanging part; 542, driving body; 543, water baffle; 544, driving surface;

[0071] 60, water distributor; 601, first water flow space; 602, second water flow space; 603, guide vane; 604, fixed convex part; 610, annular convex part; 620, first connecting ring; 630, second connecting ring;

[0072] 90, cleaning structure; 910, internal cleaning brush; 911, cleaning part; 912, base part; 930, mounting part;

[0073] 1001. Fastener; 1002. Sealing ring.

[0074] 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

[0075] 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.

[0076] 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.

[0077] 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.

[0078] Water use systems, such as whole-house water purification systems, are usually equipped with pre-filters, which are used to filter large particles of 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 used to protect the safety of back-end water use.

[0079] 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 using the water end. In the flushing mode, the pre-filter can clean the filtering components inside it to discharge the large particles previously intercepted, thereby eliminating the need to manually disassemble and clean the pre-filter, thereby increasing the service life of the pre-filter.

[0080] See also Figure 1 and Figure 2 In one embodiment of the present invention, the pre-filter includes a valve head 20 and a filter bottle 10, the filter bottle 10 is formed with a water filter chamber 101, the valve head 20 is provided with a water inlet 201 and a water outlet 202 connected to the water filter chamber 101, and the filter bottle 10 is provided with a sewage outlet 102 on the side away from the valve head 20.

[0081] The water inlet 201 is connected to the water supply end of the water use system, and the water outlet 202 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.

[0082] The connection between the valve head 20 and the filter bottle 10 can be threaded connection. For example, the valve head 20 is provided with an external threaded tube, and the mouth of the filter bottle 10 is provided with an internal thread for threading the external threaded tube. In order to reduce the production difficulty of the pre-filter and the inspection requirements of the assembly results, and to reduce the material cost of the valve head 20, in this embodiment, the filter bottle 10 and the valve head 20 are connected by a fastener 1001. The fastener 1001 can be a bolt, and the locking of the filter bottle 10 and the valve head 20 is achieved through the threaded cooperation between the bolt and the through hole; the fastener 1001 can also be a bolt and a nut assembly, and the bolt is locked with the nut after passing through the through hole; the fastener 1001 can also be a pin and a pin assembly, and the pin is passed through the through hole, and the pin is passed through the pin through the pin, so as to achieve the locking of the filter bottle 10 and the valve head 20.

[0083] The valve head 20 includes a metal shell part 21 and a plastic lining part 22 connected to each other, and the water inlet 201 and the water outlet 202 are both formed on the plastic lining part 22. The metal shell part 21 of the valve head 20 and the filter bottle 10 are connected by a fastener 1001. In this way, the water flowing through the pre-filter directly contacts the plastic lining part 22 instead of the metal shell part 21, which can avoid the problem of water being contaminated by metal elements precipitated from the metal shell part 21, and can also make the pre-filter have good aesthetics and shell strength. In other embodiments, the valve head 20 can also be directly configured as a metal part.

[0084] The material of the metal shell portion 21 and the plastic lining portion 22 is not specifically limited in this application. For example, the material of the metal shell portion 21 can be a copper alloy, such as brass, and the material of the plastic lining portion 22 can be PP (polypropylene) or PVC (polyvinyl chloride).

[0085] The pre-filter also includes a filter assembly 30 disposed in the water filter chamber 101. After the raw water (such as tap water or well water) flows into the water inlet 201 from the external water source, it can flow through the filter assembly 30 for filtration. The filter assembly 30 can intercept large particles of impurities in the water and remove some precipitated impurities, rust, sand, mud, bacteria and other particulate impurities generated in the pipeline, and play a good protective function for water purifiers, washing machines, showers, high-end faucets, downstream pipelines, etc., reducing the risk of damage to these devices due to clogging by impurities. The form and structure of the filter assembly 30 are not limited. The filter assembly 30 can be equipped with a stainless steel filter or a PP cotton filter to filter impurities.

[0086] The pre-filter is usually a "T"-shaped structure. The "horizontal" position on the top corresponds to the valve head 20, and the left and right ends are the water inlet 201 and the water outlet 202 respectively. The main body of the "vertical" position on the bottom is the filter bottle 10, and the sewage outlet 102 is located on the lower side of the filter bottle 10.

[0087] In one embodiment, if Figures 5 to 8As shown, the filter assembly 30 includes a filter module 300, and a water passage cavity 340 is formed inside the filter module 300. The filter module 300 is provided with a first water passage 330 in the axial direction thereof and connected to the water passage cavity 340. The filter module 300 is provided with a second water passage 350 in the circumferential direction thereof and connected to the water passage cavity 340. The filter module 300 includes a filter element 320 arranged at the second water passage 350, and the filter element 320 is at least partially arranged to be inclined. It can be understood that in the filtering mode, the raw water will enter the water passage chamber 340 through the second water passage 350 on the peripheral side of the filter module 300, so that the impurities in the raw water can be filtered by the filter element 320, and finally the clean water flows from the first water passage 330 on the axial side of the filter module 300 to the water outlet 202. Since the filter element 320 is at least partially inclined, the filtering area of ​​the filter element 320 can be increased at the same axial height, which means that at the same flow rate, the filter element 320 of this scheme can withstand a larger flow load and improve the filtering efficiency. Moreover, since the filtering area of ​​the filter element 320 of this scheme is large enough, even if a local area of ​​the filter element 320 is blocked, the remaining area of ​​the filter element 320 can continue to withstand a larger flow load, which helps to extend the service life of the filter module 300, reduce the replacement frequency, and thus reduce maintenance costs.

[0088] Without loss of generality, the filter element 320 is annular and has an inner ring edge and an outer ring edge, and the outer ring edge is located on one side of the inner ring edge in the axial direction, that is, the inner ring edge and the outer ring edge are not at the same height in the axial direction, so that the filter element 320 maintains an inclined shape in the circumferential direction. In this way, the filtering area of ​​the filter element 320 can be further increased, so as to further increase the flow load that the filter element 320 can withstand and improve the filtering efficiency.

[0089] Furthermore, the outer side surface of the filter element 320 is set 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 energy loss. Specifically, the generatrix of the conical surface can be a straight line, or the generatrix of the conical surface can also be a concave arc line that is concave toward the inside of the water cavity 340, or the generatrix of the conical surface can also be a convex arc line that protrudes out of the water cavity 340. In other embodiments, the outer side surface of the filter element 320 can also be a pyramidal surface, and the cross-section of the pyramidal surface is a polygon, so that the filtering area of ​​the filter element 320 can be increased.

[0090] In one embodiment, the filter assembly 30 includes a plurality of filter modules 300. The provision of a plurality of filter modules 300 improves the modularity of the filter assembly 30, and the number of filter modules 300 can be flexibly adjusted according to the model of the pre-filter (for example, but not limited to the size of the filter bottle 10), thereby achieving the effect of adjusting the size of the filter assembly 30, thereby solving the problem of sharing the filter assembly 30 of pre-filters of different models. Since the filtration area on each filter module 300 is fixed, by adjusting the number of filter modules 300, the total filtration area of ​​the filter assembly 30 can also be adjusted, so that a suitable filtration area can be set, thereby achieving the effect of improving the filtration effect.

[0091] It can be understood that in the filtering flow path of the pre-filter, the second water port 350, the water cavity 340 and the first water port 330 are sequentially distributed along the upstream and downstream. That is, when the pre-filter is in the filtering mode, the water flow entering from the water inlet 201 will flow to the water outlet 202 through the second water port 350, the water cavity 340 and the first water port 330 in sequence; and when the pre-filter is in the flushing mode, since the pre-filter is a positive flushing type, the flow direction of the water flow does not change for the filtering module. However, due to the closing of the water outlet 202 and the opening of the sewage outlet 102, the water flow entering from the water inlet 201 will not flow to the water outlet 202 through the first water port 330 after entering the water cavity 340 through the second water port 350, and will eventually flow to the sewage outlet 102 through the second water port 350.

[0092] In one embodiment, if Fig.14 As shown, the filter assembly 30 further includes a water distributor 60 , which is axially connected to the filter module 300 . Specifically, when multiple filter modules 300 are provided, the water distributor 60 is connected to a filter module 300 that is closer to the valve head 20 .

[0093] In one embodiment, if Figure 7 and Figure 8 As shown, the first connection structure 301 and the second connection structure 302 are respectively provided on both axial sides of the filter module 300, and the first connection structure 301 of one filter module 300 is used to be detachably connected with the second connection structure 302 of another filter module 300, so that the two filter modules 300 are fixed, and at least one of the first connection structure 301 and the second connection structure 302 can be detachably connected with the water distributor 60. That is, the structure of detachable connection between the two filter modules 300 is also used for detachable connection with the water distributor 60, so that the modularization degree of the filter assembly 30 can be improved, and the assembly between the various structures of the filter assembly 30 is convenient.

[0094] Specifically, it can be that one of the first connecting structure 301 and the second connecting structure 302 is set as a latching protrusion, and the other is set as a latching groove, and the water distributor 60 is correspondingly provided with a latching protrusion or a latching groove. Of course, it can also be that one of the first connecting structure 301 and the second connecting structure 302 is set as a latching hook, and the other is set as a latching groove, and the water distributor 60 is correspondingly provided with a latching hook or a latching groove.

[0095] In one embodiment, the filter module 300 includes two support frames 310 distributed along the axial direction, the water passage cavity 340 is formed between the two support frames 310, each support frame 310 is provided with the filter element 320, and the inner ring edge and the outer ring edge of the two adjacent filter elements 320 are distributed in opposite directions. It can be understood that, when the radial space in the water filter cavity 101 is constant, compared with the filter module 300 that maintains a tapered shape in one direction, the two filter elements 320 of the same filter module 300 are tapered in opposite directions, which can obtain a larger filtering area. In this way, the present embodiment can make full use of the space in the water filter cavity 101, and form a larger filtering area on the peripheral side of the filter module 300 to ensure that the filter assembly 30 can withstand a larger flow load and improve the filtering efficiency. At the same time, a sufficiently large water passage cavity 340 can be formed in the two support frames 310 to facilitate the flow of water. Of course, in other embodiments, a filter module 300 may also include only one support frame 310 , and the first water outlet 330 , the second water outlet 350 and the water passage cavity 340 are formed on the same support frame 310 .

[0096] In one embodiment, if Figure 6 As shown, the support frame 310 includes an oblique support portion 311, and the two ends of the oblique support portion 311 are respectively connected with a first ring portion 312 and a second ring portion 313, and the two oblique support portions 311 of the same filter module 300 are connected through the second ring portion 313, and the inner periphery of the first ring portion 312 is provided with the first water outlet 330, and the second water outlet 350 is provided at the oblique support portion 311. In this way, the structural strength of the support frame 310 can be guaranteed, and the connection strength between the two support frames 310 can be guaranteed, so as to ensure the filtering capacity of the filter assembly 30. Of course, in other embodiments, the support frame 310 can also be set to other structural forms.

[0097] Specifically, the inclined support portion 311 includes a plurality of ribs spaced apart along the circumferential direction to form a plurality of second water outlets 350 spaced apart along the circumferential direction. The filter element 320 is stacked on the inclined support portion 311. In this way, the filter element 320 can be provided with sufficient support by the inclined support portion 311. In addition, the total flow area of ​​the second water outlet 350 is relatively large, so that the filter module 300 has sufficient flow capacity.

[0098] Without loss of generality, the outer diameter of the second ring portion 313 is greater than the outer diameter of the first ring portion 312, so that each filter element 320 will be alternately tapered in the upper and lower directions, which can make fuller use of the space in the water filter cavity 101 to provide a larger filtering area, thereby further improving the filtering efficiency of the filter assembly 30. Of course, in other embodiments, the outer diameter of the first ring portion 312 may be greater than the outer diameter of the second ring portion 313, or there may be no definite size relationship between the diameters of the first ring portion 312 and the second ring portion 313.

[0099] In one embodiment, if Figures 5 to 8 As shown, each of the support skeletons 310 is provided with the second ring portion 313, and the two second ring portions 313 of the same filter module 300 are detachably connected. It can be understood that the detachable connection allows the parts to be easily separated without damaging the connector itself or adjacent parts. This feature allows the filter module 300 to be operated quickly and effectively when the support skeleton 310 needs to be repaired or replaced, reducing the difficulty and cost of maintenance. Since the detachable connection is easy to operate, it can greatly save time when the filter module 300 maintains and replaces the support skeleton 310. Moreover, the detachable connection allows the fast replacement of the faulty support skeleton 310, thereby reducing the time of water outage of the water system and improving the maintenance efficiency. Secondly, compared with the non-detachable connection, the detachable connection reduces the situation of the overall scrapping of the parts due to the inability to disassemble, and reduces the waste of resources. Furthermore, the detachable connection allows the filter assembly 30 to be inspected and maintained regularly or irregularly to ensure its stability and safety, which helps to timely discover and solve potential safety hazards.

[0100] Further, in some possible connection modes, the two second ring parts 313 are clamped. It can be understood that when the second ring part 313 is made of plastic or metal, the clamping structure can be directly formed on the second ring part 313, and no additional locking accessories, such as screws, nuts, etc., are required during assembly, thereby reducing the manufacturing cost and assembly cost. Moreover, since the clamping structure is flexible in design, it can be customized according to the actual needs of the second ring part 313, reducing the waste of materials and improving the utilization rate of materials. Secondly, the clamping can achieve rapid assembly and disassembly without complex tools and equipment. This greatly improves the production efficiency and assembly efficiency, and also facilitates the maintenance and replacement of the filter module 300. Specifically, the clamping structure can be the cooperation of the hook and the hook groove, or the cooperation of the convex and the groove. Of course, in other embodiments, it can also be that the two second ring parts 313 are threadedly connected, and through the tight meshing of the threads, the connection between the two second ring parts 313 has a higher tensile and compressive strength, which can meet the use requirements under various working conditions. After assembly, the connection part is not easy to loosen, and a stable connection state can be maintained to ensure the normal operation of the filter module 300.

[0101] Optionally, in the same filter module 300, the end faces of the two second ring portions 313 abut against each other; it can be understood that in the same filter module 300, the two support skeletons 310 are connected by the two second ring portions 313, and the water passage cavity 340 is formed between the two support skeletons 310. By abutting the end faces of the two second ring portions 313, the two support skeletons 310 can be connected and the water passage cavity 340 can be sealed at the same time, which is beneficial to saving processing steps and improving production efficiency.

[0102] In one embodiment, the first ring portions 312 of two adjacent filter modules 300 are detachably connected, and the specific method of the detachable connection of the two first ring portions 312 can refer to the connection method of the two second ring portions 313, and the connection method between the water distributor 60 and the filter module 300 can also refer to the connection method between the two second ring portions 313. In this way, modular assembly between different filter modules 300 can be facilitated. Furthermore, the end faces of the first ring portions 312 of the two adjacent filter modules 300 are abutted against each other, so that the first water outlets 330 of the two adjacent filter modules 300 can be connected while the connection of the two adjacent filter modules 300 is achieved, which is conducive to saving processing steps and improving production efficiency.

[0103] In one embodiment, please refer to Figure 2 , Figure 3 , Figure 5 and Fig.19 The valve head 20 is provided with a water-isolating ring 210 between the water inlet 201 and the water outlet 202, the water inlet 201 is connected to the outer peripheral side of the water-isolating ring 210, and the water outlet 202 is connected to the inner peripheral side of the water-isolating ring 210, and the water distributor 60 is formed with a first water flow space 601 and a second water flow space 602, the second water flow space 602 is arranged outside the first water flow space 601, the axial sides of the first water flow space 601 are respectively connected to the first water flow port 330 and the inner peripheral side of the water-isolating ring 210, the axial sides of the second water flow space 602 are respectively connected to the outer peripheral side of the water-isolating ring 210 and the second water flow port 350, and a guide blade 603 inclined relative to the axial direction is provided. Specifically, the axial sides of the water distributor 60 are respectively connected to the filter module 300 and the water blocking ring 210. In the flushing mode and the filtering mode of the pre-filter, the first water flow space 601 and the second water flow space 602 of the water distributor 60 will maintain communication with the above-mentioned corresponding structures, that is, the pre-filter is a positive flushing filter. In the flushing mode and the filtering mode, the flow path of water flowing into the filter assembly 30 does not change.

[0104] In the filtering mode, the water inlet 201 and the water outlet 202 are opened, and the sewage outlet 102 is closed. After the water entering the water inlet 201 passes through the first water flow space 601 and enters the water filter chamber 101, it will flow from the outer periphery of the filter component 30 through the second water flow port 350 of the filter component 30 to enter the inner periphery of the filter component 30, thereby being filtered by the filter element 320. Impurities are intercepted by the filter element 320, and the filtered water will flow through the second water flow space 602 to the inner side of the water isolation ring 210, and finally flow to the water outlet 202.

[0105] In the flushing mode, the water inlet 201 and the sewage outlet 102 are opened, and the water outlet 202 is closed. The water flow entering the water inlet 201 still enters the water filter chamber 101 through the first water flow space 601. After the water flow flushes the surface of the filter element 320, the sewage will be discharged through the sewage outlet 102, thereby discharging the impurities previously intercepted, which can reduce the adhesion of impurities on the filter element 320, so as to ensure the filtering effect of the filter assembly 30 and improve the service life of the pre-filter.

[0106] Among them, the guide blades 603 arranged in the second water flow space 602 enable the water flow entering the water filter chamber 101 to form a vortex, so as to disturb the water flow and avoid the deposition of impurities. Especially in the flushing mode, the impurities can be better entrained in the water flow, thereby facilitating the impurities to be discharged from the sewage outlet 102 along with the water flow.

[0107] In one embodiment, please refer to Figure 2 and Figure 3 , the water distributor 60 and the water isolating ring 210 are separately molded and sealed. Specifically, the water isolating ring 210 can be integrally molded with the plastic lining of the valve head 20, and the water distributor 60 can be first assembled with the filter module 300, and then the filter assembly 30 is assembled on the valve head 20, so that the water distributor 60 and the water isolating ring 210 are sealed and connected, and finally the valve head 20 and the filter bottle 10 are assembled. The sealed connection between the water distributor 60 and the water isolating ring 210 can avoid water leakage at the connection between the two, which causes the unfiltered raw water and the filtered clean water to leak into each other, thereby ensuring the filtering effect of the pre-filter. Of course, in other embodiments, the water distributor 60 and the water isolating ring 210 can also be integrally molded.

[0108] In one embodiment, please refer to Figure 2 , Figure 3 and Figure 5The water distributor 60 includes an annular protrusion 610 protruding away from the filter module 300, and the first water flow space 601 is formed on the inner peripheral side of the annular protrusion 610, and the annular protrusion 610 is plugged into the water isolation ring 210. In this way, the fixed connection between the water distributor 60 and the water isolation ring 210 can be achieved, and at the same time, the sealed connection between the water distributor 60 and the water isolation ring 210 is facilitated. Among them, the annular protrusion 610 can be inserted into the water isolation ring 210, or the water isolation ring 210 can be inserted into the annular protrusion 610. The water distributor 60 and the water isolation ring 210 can be sealed by bonding or melt welding, or a sealing ring 1002 can be sleeved on the outer periphery of the annular protrusion 610, and the sealing ring 1002 is sealed with the inner periphery of the water isolation ring 210. Of course, in other embodiments, the water distributor 60 may be formed with a groove structure, and the water isolating ring 210 may be inserted into the groove of the water distributor 60, or the end surfaces of the water distributor 60 and the water isolating ring 210 may be butted against each other.

[0109] In one embodiment, please refer to Figure 2 , Figure 3 and Figure 5 , the water distributor 60 also includes a first connecting ring 620 and a second connecting ring 630, the second connecting ring 630 is arranged outside the first connecting ring 620, the second water flow space 602 is formed between the first connecting ring 620 and the second connecting ring 630, the annular protrusion 610 is arranged on the first connecting ring 620, and is connected to the first connecting ring 620 in a step-like manner, and the first connecting ring 620 abuts against the end face of the water isolation ring 210. In this way, the step-like structure formed by the annular protrusion 610 protruding from the first connecting ring 620 can provide a positioning function for the insertion between the water distributor 60 and the water isolation ring 210. When the end face of the water isolation ring 210 abuts against the first connecting ring 620, it means that the annular protrusion 610 is inserted into the water isolation ring 210. Of course, in other embodiments, a step structure can also be formed on the inner periphery of the water isolation ring 210 for the end face of the annular protrusion 610 to abut.

[0110] In one embodiment, please refer to Figure 5, the outer periphery of the water distributor 60 is snap-fitted to the inner circumferential wall of the filter bottle 10. Specifically, the outer circumferential side of the second connecting ring 630 is convexly provided with a fixing protrusion 604, and the inner circumferential wall of the filter bottle 10 is correspondingly provided with a mounting groove, and the fixing protrusion 604 is snap-fitted to the mounting groove. Among them, the fixing protrusion 604 and the mounting groove can be correspondingly provided with a plurality of them, and through the one-to-one engagement of the two, the water distributor 60 and the filter bottle 10 are fixed in the circumferential direction to ensure the effect of the water distributor 60 forming a vortex. Furthermore, due to the fixed connection between the water distributor 60 and the filter module 300, the relative fixation of the water distributor 60 and the filter bottle 10 in the circumferential direction can also make each filter module 300 remain relatively fixed in the filter bottle 10, thereby ensuring the installation stability of the filter assembly 30 in the filter bottle 10.

[0111] In one embodiment, please refer to Figure 2 , Figure 4 , Fig. 9 and Fig.10 The pre-filter also includes an exoskeleton 50, which is rotatably mounted on the outside of the filter assembly 30. In this way, the exoskeleton 50 can be rotated to disturb the water flow in the water filter chamber 101, thereby preventing impurities from being deposited and attached to the filter assembly 30, the exoskeleton 50 and the side walls of the water filter chamber 101, and reducing the possibility of clogging of the filter assembly 30, thereby ensuring the filtering effect of the filter assembly 30. In this embodiment, the exoskeleton 50 includes a side frame 512 and a chassis 511, and the chassis 511 is connected to the side frame 512 and is located on a side away from the valve head 20, with strong structural stability and high rotation stability. Of course, in other embodiments, the exoskeleton 50 may also include only the side frame 512 structure.

[0112] Further, the outer frame 50 is formed with a siphon channel 501, the side frame 512 is provided with a siphon hole 531 connected to the siphon channel 501, and the bottom plate 511 is provided with a first discharge port 503 connected to the siphon channel 501, and the first discharge port 503 is connected to the sewage outlet 102. The technical solution of the present invention is to set the siphon channel 501 and the siphon hole 531 on the outer frame 50, when the impurities and particles intercepted by the filter assembly 30 are impacted by the water flow and fall off, they can be sucked into the siphon hole 531 and the siphon channel 501 by the siphon effect, and be more efficiently discharged to the sewage outlet 102 through the first discharge port 503. That is, in the flushing mode, the impurities, particles, etc. intercepted by the filter assembly 30 can be more effectively and quickly guided to the sewage outlet 102, and finally discharged through the sewage outlet 102, thereby improving the flushing effect of the water filter cavity 101, especially the filter assembly 30.

[0113] In one embodiment, please refer to Figure 2 , Figure 4 , Fig.11 and Fig.12An impeller assembly 40 is also provided in the water filter chamber 101. The impeller assembly 40 includes a mounting seat 410 and an impeller body 440 rotatably mounted on the mounting seat 410. The mounting seat 410 is formed with a water inlet and a drain port 404. The water inlet includes a first water inlet 402. The first drain port 503 is connected to the sewage outlet 102 via the first water inlet 402 and the drain port 404 in sequence.

[0114] During the flushing stage of the pre-filter, that is, when the drain valve is opened, water flows into the pre-filter through the water inlet of the impeller assembly 40, and the impeller body 440 rotates under the impact of the water flow. This rotational motion can generate a vortex effect, so that the water flow forms a stronger agitation inside the filter bottle 10, thereby more effectively removing impurities and dirt attached to the surface of the filter medium. Compared with static water flow, the dynamic cleaning of the impeller assembly 40 can significantly improve the efficiency and effect of flushing. In addition, the rotational motion of the impeller body 440 can stir up the impurities and dirt inside the filter bottle 10, suspending them in the water, and discharge the filter bottle 10 with the water flow through the drain valve and the drain port 102, thereby avoiding the re-deposition of impurities on the filter medium and ensuring the thoroughness of the flushing process. In addition, the impeller assembly 40 can effectively prevent the clogging of the filter medium, keep the water flow unobstructed, and maintain the filtering efficiency of the pre-filter by enhancing the flushing effect. This is crucial to maintaining stable water pressure and clean water quality in home or commercial systems.

[0115] In addition, the impeller assembly 40 is arranged upstream of the sewage outlet 102. The impeller assembly 40 generates centrifugal force through rotation, which can cause the water flowing out of the sewage outlet 102 to generate a vortex, thereby improving the drainage effect and flushing efficiency and reducing water waste. The design of the impeller assembly 40 helps to achieve a more environmentally friendly and energy-saving filtration system.

[0116] By arranging the impeller assembly 40 in the sewage system and using the water flow power to drive the impeller body 440 to rotate, not only can the flushing force and stirring effect of the water flow be enhanced, but also the sewage discharge efficiency and cleanliness can be improved. At the same time, the design of the impeller assembly 40 can be relatively simple, low cost, and no additional energy consumption is required, which helps to reduce the overall operating cost and reduce the waste of water resources.

[0117] Furthermore, the outer frame 50 is transmission-connected to the impeller body 440 , so that the impeller body 440 can rotate in the same direction as the outer frame 50 during the flushing stage and provide additional rotational driving force to the outer frame 50 .

[0118] There are many structural forms for realizing the transmission connection between the exoskeleton 50 and the impeller body 440. For example, the impeller body 440 is coaxially connected to the exoskeleton 50 and fixed in the circumferential direction, that is, the impeller body 440 is fixed to the rotation axis of the exoskeleton 50 in the circumferential direction. Specifically, the exoskeleton 50 may have a plurality of first protrusions distributed along the circumference on one side facing the mounting seat 410, and a plurality of second protrusions are provided at one end of the impeller shaft close to the exoskeleton 50. The plurality of second protrusions are distributed along the circumference of the impeller shaft, and a first protrusion is clamped between two adjacent second protrusions. Alternatively, a flat position is provided at the end of the impeller shaft, and a corresponding structural groove structure is provided on the exoskeleton for the flat position of the impeller shaft to engage. In this way, the rotation of the exoskeleton 50 and the rotation of the impeller body 440 can promote each other to ensure the turbulence effect of the exoskeleton 50 and the impeller body 440, thereby avoiding the deposition of impurities.

[0119] See also Fig.10 It is worth mentioning that the first discharge port 503 is set at an oblique angle, which can make the water flow obliquely enter the mounting seat 410, thereby improving the rotation efficiency of the impeller body 440.

[0120] In one embodiment, the water inlet further includes a second water inlet 403, the first water inlet 402 is arranged on one axial side of the mounting seat 410, and the second water inlet 403 is arranged on the circumferential side of the mounting seat 410. Correspondingly, the impeller body 440 includes an impeller shaft and a plurality of impeller blades obliquely arranged on the impeller shaft, and the water flows from the first water inlet 402 and the second water inlet 403 can both cause the impeller blades to drive the impeller shaft to rotate. In this way, the water flow path and flow rate entering the mounting seat 410 are increased through the first water inlet 402 and the second water inlet 403, and the provision of multiple water inlets can form a more complex flow pattern of water flow in the impeller chamber, providing sufficient power for the rotation of the impeller body 440.

[0121] See also Fig.13 Specifically, optionally, the impeller body 440 includes an impeller shaft 441 and a plurality of inclined impeller blades 442, one side of the impeller blade 442 is curved into an arc surface, a portion of the arc surface faces the first water inlet 402, and the other portion faces the second water inlet 403, so that the impeller blade 442 can be acted upon by the water flow of the second side water inlet 403 and the first top water inlet 402 and drive the impeller shaft 441 to rotate.

[0122] Sewage enters the impeller chamber through the first water inlet 402 and the second water inlet 403, interacts with the rotating impeller body 440, generates a rotating force and a stirring effect, and helps to flush out the impurities remaining in the filter assembly 30. The rotating impeller body 440 not only enhances the rotating force and stirring effect of the water flow, but also guides the water flow to the sewage outlet 102 through its specific impeller blade design, thereby improving the sewage discharge efficiency and cleanliness. The drain outlet 404 is set at the bottom or side of the mounting seat 410 (usually opposite to the sewage outlet 102) to facilitate the discharge of sewage.

[0123] In one embodiment, please refer to Fig.10 and Fig.11 The chassis 511 is also provided with a second discharge port 504 extending axially therethrough. A water retaining structure is formed on opposite sides of the exoskeleton 50 and the mounting seat 410. The water retaining structure is arranged around the first discharge port 503. The second discharge port 504 is located on the periphery of the water retaining structure to be connected to the second water inlet 403.

[0124] Specifically, a water retaining ring 514 is provided at the bottom of the outer frame 50, and a water retaining ring 424 is provided at the mounting seat 410. The water retaining ring 514 and the water retaining ring 424 cooperate to form a water retaining structure. The siphon flow channel 501 and the first water inlet 402 are connected at the inner periphery of the water retaining structure, and the filter water cavity 101 at the outer periphery of the filter assembly 30 is connected to the second water inlet 403 at the outer periphery of the water retaining structure through the second discharge port 504. Further, the mounting seat 410 is provided with second water inlets 403 on both opposite sides, and the water in the filter bottle 10 other than the siphon flow channel 501 can enter from these two second water inlets 403 when discharging sewage. Four first water inlets 402 inclined in the same direction are designed on the mounting seat 410, and the water flowing out of the siphon flow channel 501 enters the impeller cavity through the first water inlet 402. In this way, the water inlet paths of the two water inlets of the impeller assembly 40 can be separated by the water retaining structure without interfering with each other, thereby preventing excessive water flow from other positions from entering the first water inlet 402 at the top of the mounting seat 410, thereby ensuring the adsorption capacity of the siphon channel 501.

[0125] In one embodiment, please refer to Fig. 9The side frame 512 is provided with a water flow driving member 540, and the water flow driving member 540 has a driving surface 544, and the driving surface 544 is set at an angle relative to the circumference of the outer frame 50, so that after the driving surface 544 is subjected to the impact of the water flow, it can drive the outer frame 50 to rotate. In this way, when the driving surface 544 is driven by the water flow, the water flow driving member 540 can generate a driving force on the outer frame 50 in the circumference of the outer frame 50, thereby prompting the outer frame 50 to rotate around its axis, that is, around the axial rotation of the filter assembly 30, so that the kinetic energy of the water flow can be converted into the kinetic energy of the rotation of the outer frame 50 through the driving surface 544, and the rotation of the outer frame 50 is realized, thereby disturbing the water flow in the water filter chamber 101, preventing impurities from being deposited and attached to the filter assembly 30, the outer frame 50 and the side wall of the water filter chamber 101, reducing the possibility of clogging of the filter assembly 30, and thus improving the filtering effect of the filter assembly 30. Furthermore, the water flow can form a vortex after passing through the water distributor 60, thereby providing a greater driving force through the driving surface 544. That is, the water distributor 60 cooperates with the water flow driving member 540 to provide a certain rotation driving force to the exoskeleton 50, and the impeller body 440 itself rotates under the impact of the water flow and links the exoskeleton 50, and can also provide a certain rotation driving force to the exoskeleton 50, and these two rotation driving forces are arranged in the same direction.

[0126] In one embodiment, the water flow drive member 540 is clamped to the end of the side frame 512. The water flow drive member 540 is connected to the end of the side frame 512 by clamping, so that the side frame 512 and the water flow drive member 540 are formed separately, which improves the molding probability and convenience. The side frame 512 and the water flow drive member 540 are connected by clamping, and the connection operation is convenient. At the same time, the water flow drive member 540 can also be kept stable at the end of the side frame 512 to improve production efficiency. Of course, in other embodiments, the water flow drive member 540 can also be connected to the side frame 512 by screwing, melting or integral molding, or the water flow drive member 540 is clamped to the axial middle part of the side frame 512.

[0127] Specifically, in this embodiment, a plurality of water flow driving members 540 are provided on the side frame 512, and the plurality of water flow driving members 540 are spaced apart along the circumference of the outer frame 50. It can be understood that the plurality of water flow driving members 540 are spaced apart at the end of the side frame 512 around the circumference of the outer frame 50, so that the plurality of driving surfaces 544 distributed in the circumference of the outer frame 50 tend to be uniform, and thus the driving force received by the outer frame 50 in the circumference can be balanced, so that the outer frame 50 can rotate at a uniform speed to ensure the cleaning effect of the filter assembly 30. Without loss of generality, in this embodiment, the water flow driving member 540 is provided with a plurality of driving surfaces 544, and the plurality of driving surfaces 544 are uniformly distributed on the water flow driving member 540 along the circumference of the outer frame 50, and the plurality of water flow driving members 540 are uniformly distributed in the circumference of the side frame 512, thereby ensuring that the driving surfaces 544 are uniformly distributed in the circumference of the side frame 512, so as to ensure the rotational stability of the outer frame 50. Of course, in other embodiments, a plurality of water flow driving members 540 may also be distributed along the axial direction of the side frame 512 to balance the rotational stability of the outer frame 50 in the axial direction.

[0128] As for the clamping relationship between the water flow drive member 540 and the side frame 512, in this embodiment, the water flow drive member 540 includes a hanging portion 541, and the hanging portion 541 is hung on the end of the side frame 512 and is clamped with the side frame 512. It can be understood that the water flow drive member 540 is hung from the end of the side frame 512 toward the side frame 512 along the axial direction, and the connection operation is convenient and the connection is stable. After the hanging portion 541 is hung on the side frame 512, the water flow drive member 540 is clamped with the side frame 512. Here, the hanging portion 541 can be clamped on the side frame 512, or other parts of the water flow drive member 540 can be clamped on the side frame 512. In this way, the connection in a hanging manner provides a positioning reference for the connection between the water flow drive member 540 and the side frame 512, and simplifies the connection between the water flow drive member 540 and the side frame 512. In addition, after the hooking portion 541 is hooked to the side wall, a limit is formed on the water flow driving member 540 in the radial direction to prevent the water flow driving member 540 from moving radially relative to the side frame 512. Of course, in other embodiments, the water flow driving member 540 can also be connected to the side wall by plugging, or by turning a knob.

[0129] The water flow driving member 540 also includes a driving body 542 connected to the hanging portion 541, the driving body 542 is hung on the inner side of the side frame 512, the hanging portion 541 is engaged with the outer side of the side frame 512, and the driving surface 544 is formed on the driving body 542. Without loss of generality, the gap between the outer frame 50 and the shell is small, and the gap between the outer frame 50 and the filter assembly 30 is large to ensure the efficiency of filtering the water through the filter assembly 30. In this way, the driving body 542 with the driving surface 544 is arranged on the inner side of the side frame 512 to prevent the tension between the side wall of the water filter chamber 101 and the water flow from affecting the impact force of the water flow on the driving surface 544, thereby ensuring the rotation stability and reliability of the outer frame 50. In addition, since the driving surface 544 is arranged on the driving body 542, the driving body 542 inevitably maintains good flatness in the circumferential direction of the side frame 512. The driving body 542 is arranged on the inner side of the side frame 512, which can ensure the flatness of the outer side of the outer frame 50, avoid the interference of the shell with the rotation of the outer frame 50, and ensure that the driving surface 544 obtains sufficient water flow impact. At the same time, the hanging part 541 is clamped on the outer side of the side frame 512, and the driving body 542 is on the inner side of the side frame 512, balancing the force of the water flow driving member 540 in the inner and outer directions of the side frame 512, thereby ensuring the connection stability of the water flow driving member 540 and the side frame 512. Of course, in other embodiments, when the gap between the side frame 512 and the cavity wall of the water filter cavity 101 is large, the driving body 542 can also be arranged on the outer side of the side frame 512.

[0130] In one embodiment, the driving surface 544 is parallel to the axial direction of the outer frame 50. It can be understood that the driving surface 544 is distributed in the circumferential direction of the side frame 512, and can refer to the arrangement of the guide vanes 603 in the water distributor 60, and guide the water flow to impact the driving surface 544 by the guiding effect of the guide vanes 603 on the water flow, or, a drainage structure is set on the channel wall between the water inlet 201 and the water flow driving member 540, and the water flow is guided in a vortex shape along the axial direction of the filter assembly 30, so that it can directly impact the driving surface 544 parallel to the axial direction of the outer frame 50, so that the water flow driving member 540 can obtain a larger water flow impact force, improve the rotation speed or rotation efficiency of the outer frame 50, avoid impurities from adhering to the filter assembly 30, ensure the cleanliness of the filter assembly 30, and improve the filtering efficiency of the filter assembly 30 for the water flow. Of course, in other embodiments, the driving surface 544 can also be inclined relative to the axial direction of the outer frame 50, or, relative to the radial direction of the side frame 512.

[0131] In one embodiment, please refer to Fig.10The driving body 542 extends in an arc shape along the circumference of the side frame 512, and a plurality of water baffles 543 are distributed at intervals, and the driving surface 544 is formed on the water baffles 543. Without loss of generality, the water baffles 543 are protruded from the driving body 542, and the driving surface 544 is formed on the side wall of the water baffles 543 along the circumference of the side frame 512, so that the driving surface 544 can have a certain size in the radial direction, ensuring that the driving surface 544 is stably impacted by the water flow, and at the same time, the driving body 542 extends in an arc shape along the inner circumference of the side frame 512, and a plurality of water baffles 543 are distributed at intervals in the extension direction of the driving body 542, so as to evenly distribute the driving force in the circumference of the side frame 512, and ensure the stability of the rotation of the exoskeleton 50. In addition, the driving body 542 is arranged in a conformal manner on the inner circumferential wall of the side frame 512, and the two are closely fitted. When the driving body 542 is subjected to force, the inner wall of the side frame 512 can provide a sufficiently stable support for the driving body 542, thereby effectively pulling the side frame 512 to rotate, avoiding shaking between the water flow driving member 540 and the side frame 512, resulting in energy waste, ensuring the rotation efficiency of the outer frame 50, and improving the cleaning effect of the filter assembly 30. Of course, in other embodiments, a driving groove can also be recessed on the driving body 542, and the side groove wall of the driving groove is configured as a driving surface 544.

[0132] In one embodiment, please refer to Fig.10 The side frame 512 is also provided with a cleaning structure 90, which is staggered with the siphon flow channel 501. The cleaning structure 90 can also be arranged in multiple groups in the circumferential direction to clean at least one of the inner wall of the filter bottle 10 and the outer peripheral side of the filter module 300. In the flushing mode, with the rotation of the outer frame 50, the cleaning structure 90 can sweep away the impurities on the relevant structure through the cleaning effect, so that the impurities are separated and can be discharged with the water flow, thereby avoiding serious blockage on the filter assembly 30, ensuring the filtering effect of the filter assembly 30, and improving the service life of the pre-filter.

[0133] In one embodiment, see Figures 15 to 17The cleaning structure 90 includes an inner cleaning brush 910 protruding from the inner circumference of the outer frame 50, and the inner cleaning brush 910 includes a cleaning portion 911, and the cleaning portion 911 extends in the axial direction of the outer frame 50. The cleaning portion 911 and the filter element 320 are correspondingly arranged so as to clean the filter element 320 through the cleaning portion 911. Since the filter element 320 of the filter assembly 30 has a certain extension in the radial direction of the outer frame 50, the side portion of the cleaning portion 911 distributed in the axial direction of the outer frame 50 can be arranged opposite to the filter element 320, and the filter element 320 can be scraped and washed by the side portion, so that the filter element 320 can be covered more comprehensively, thereby increasing the cleaning area of ​​the filter element 320 by the cleaning portion 911, and avoiding dead angles to a large extent. As a result, the cleaning effect of the pre-filter on the filter assembly 30 can be improved, thereby increasing the service life of the pre-filter.

[0134] In one embodiment, the cleaning portion 911 extends obliquely relative to the axial direction of the outer frame 50. In this way, the deformation capacity of the cleaning portion 911 in the axial direction of the outer frame 50 can be improved. It can be understood that the cleaning portion 911 and the filter element 320 will abut and fit in the axial direction of the outer frame 50, and the cleaning portion 911 is easy to deform in the abutment and fitting direction of the two, which is conducive to reducing the pressure between the cleaning portion 911 and the filter element 320, thereby reducing the friction between the cleaning portion 911 and the filter element 320 when the outer frame 50 and the filter assembly 30 rotate relative to each other, so that the outer frame 50 can smoothly rotate relative to the filter assembly 30 to ensure that the cleaning portion 911 fully cleans the filter element 320 in the circumferential direction.

[0135] Furthermore, the cleaning portion 911 extends obliquely along the circumference of the exoskeleton 50 relative to the axial direction of the exoskeleton 50. It can be understood that the direction in which the cleaning portion 911 is inclined is a direction that is conducive to its deformation. In this embodiment, the exoskeleton 50 rotates along the circumference, and the cleaning portion 911 is easy to deform in the circumference of the exoskeleton 50, which is conducive to further reducing the friction between the cleaning portion 911 and the filter element 320 to ensure the smooth rotation of the exoskeleton 50. In addition, the cleaning portion 911 can more easily cover more area on the filter element 320, which is conducive to improving the cleaning effect of the cleaning portion 911 on the filter element 320.

[0136] In one embodiment, a plurality of cleaning parts 911 are distributed in the axial direction of the outer frame 50, and one cleaning part 911 is provided corresponding to one filter element 320. In this way, one cleaning part 911 can be used to clean one filter element 320 to ensure the cleaning effect of the filter assembly 30.

[0137] In one embodiment, see Fig.14, there are multiple cleaning structures 90 distributed in the circumferential direction of the outer skeleton 50. Among them, it can be that each cleaning structure 90 is provided with the same number of cleaning parts 911 corresponding to the number of filter elements 320, so that each filter element 320 will be cleaned by the cleaning parts 911 of multiple cleaning structures 90 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 part 911 is only provided for part of the filter elements 320 on a cleaning structure 90, and the cleaning parts 911 are staggered on multiple cleaning structures 90 distributed in the circumferential direction, so that each filter element 320 is provided with at least one cleaning part 911. In this way, under the premise of ensuring the coverage of the cleaning structure 90 on the filter element 320, the friction between the cleaning part 911 and the filter element 320 can also be dispersed in the circumferential direction, which is beneficial to ensure the stability and smoothness of the rotation of the outer skeleton 50.

[0138] The plurality of cleaning parts 911 are arranged to be tilted relative to the axial direction of the exoskeleton 50 along the same circumferential direction of the exoskeleton 50. In this way, the tilting direction of the cleaning parts 911 can be conveniently set according to the need of the rotation direction of the exoskeleton 50 to reduce the friction between the cleaning parts 911 and the cleaning surface, thereby ensuring the smooth rotation of the exoskeleton 50. For example, when the exoskeleton 50 needs to rotate clockwise, each cleaning part 911 is tilted in the counterclockwise direction.

[0139] In one embodiment, see Fig.17 In the schematic diagram on the right side, the side of the cleaning part 911 distributed in the axial direction of the outer frame 50 is inclined. The side of the cleaning part 911 used to clean the filter element 320 is set to an inclined shape corresponding to the filter element 320, which can improve the fit between the cleaning part 911 and the filter element 320, and is conducive to improving the cleaning force of the cleaning part 911 on the filter element 320, thereby ensuring the cleaning effect of the filter assembly 30 and ensuring the life of the pre-filter.

[0140] In one embodiment, see Fig.16 For the multiple cleaning parts 911 located at the same axial position, the adjacent two cleaning parts 911 are arranged at an acute angle. In this way, the spatial arrangement of the multiple cleaning parts 911 can be facilitated, and at the same time, it is beneficial to ensure that the cleaning parts 911 cover the filter element 320 in the axial direction. Fig.16 , the angle α between two adjacent cleaning parts 911 is preferably 60 degrees to 80 degrees. That is, the angle α between two adjacent cleaning parts 911 is greater than or equal to 60 degrees and less than or equal to 80 degrees. Of course, in other embodiments, the angle between two adjacent cleaning parts 911 can also be adjusted to a range less than 60 degrees or greater than 80 degrees.

[0141] In one embodiment, see Figures 15 to 17The inner cleaning brush 910 further includes a base portion 912, which is protruding from the inner circumference of the outer frame 50, and the cleaning portion 911 is connected to the outer circumference of the base portion 912. In this way, the base portion 912 can provide support for the cleaning portion 911 to improve the structural strength of the inner cleaning brush 910, and the cleaning portion 911 can be connected to the outer frame 50 through the base portion 912, without extending to the inner circumference of the outer frame 50 to connect with the outer frame 50. The cleaning portion 911 only needs to maintain the axial coverage of the filter element 320. Of course, in other embodiments, the cleaning portion 911 can also be directly connected to the outer frame 50.

[0142] In one embodiment, one base portion 912 is provided with two cleaning portions 911 extending in opposite directions in the axial direction of the outer frame 50. In this way, the two cleaning portions 911 provided on one base portion 912 can clean two filter elements 320, which is helpful to simplify the structure of the cleaning structure 90. Of course, in other embodiments, the base portion 912 and the cleaning portion 911 may be provided in a one-to-one correspondence.

[0143] Furthermore, a base portion 912 is correspondingly provided at the connection of the two filter modules 300, and two cleaning portions 911 on the base portion 912 extend in opposite directions relative to the base portion 912 in the axial direction of the outer frame 50. In this way, the connection of the two adjacent filter modules 300 can form a space for accommodating the internal cleaning brush 910, and the two cleaning portions 911 on the base portion 912 can be used to clean the filter elements 320 on the adjacent sides of the two filter modules 300, which is conducive to improving the compactness of the internal structure of the pre-filter, thereby improving the utilization rate of the internal space of the water filter chamber 101, and is conducive to realizing the miniaturization design of the pre-filter.

[0144] In this embodiment, the internal cleaning brush 910 has two types of structures. For the internal cleaning brush 910 provided at the connection between the two filter modules 300, two cleaning parts 911 extending in opposite directions in the axial direction of the outer frame 50 are provided on a base part 912. For the internal cleaning brush 910 provided at the end of the filter assembly 30, only one cleaning part 911 is required to be provided on the base part 912. The structure of the internal cleaning brush 910 can be the structure of the aforementioned internal cleaning brush 910 divided in half. Without loss of generality, in the former type of internal cleaning brush 910, the base part 912 can be cylindrical, and the two cleaning parts 911 are distributed on both sides of the axis of the cylinder. In the latter type of internal cleaning brush 910, the base part 912 is configured as half a cylinder, and the cleaning parts 911 are connected to the circumference of the cylinder.

[0145] In one embodiment, see Fig.16 and Fig.17The cleaning portion 911 is configured as a sheet structure. In this way, the cleaning portion 911 is relatively thin and has good deformation ability. When the cleaning portion 911 abuts against the filter element 320, it will not generate too much resistance to the filter element 320, thereby avoiding the situation where the filter element 320 is stuck and the outer frame 50 cannot rotate. For details, please refer to Fig.17 , the thickness d of the cleaning portion 911 is 0.5 mm to 1 mm. That is, the thickness d of the cleaning portion 911 is greater than or equal to 0.5 mm, and less than or equal to 1 mm. In this way, the cleaning portion 911 can have an appropriate thickness, which can not only meet the requirements for deformation ability, but also ensure that the cleaning portion 911 has sufficient structural strength, and ensure the connection stability between the cleaning portion 911 and the base portion 912 or other related structures. Of course, in other embodiments, on the premise of meeting the requirements for deformation ability and structural strength, the thickness of the cleaning portion 911 can also be set to a range of less than 0.5 mm or greater than 1 mm.

[0146] In one embodiment, the cleaning portion 911 and the filter element 320 are in interference contact. In this way, the cleaning portion 911 can clean the impurities of the filter element 320 more deeply, so as to enhance the cleaning strength of the cleaning structure 90 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 911 and the filter element 320 is 0.8mm to 1.2mm. That is, the interference between the cleaning portion 911 and the filter element 320 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 911 and the filter element 320 can be within a suitable range, and while ensuring the cleaning strength of the cleaning portion 911 on the filter element 320, the friction between the cleaning portion 911 and the filter element 320 will not be too large, avoiding excessive interference with the rotation of the exoskeleton 50, and also reducing the wear on the cleaning portion 911. Of course, in other embodiments, the interference between the cleaning portion 911 and the filter element 320 can also be adjusted to a range less than 0.8 mm or a range greater than 1.2 mm according to needs.

[0147] In one embodiment, the cleaning structure 90 is detachably mounted on the outer frame 50. In this way, when the cleaning portion 911 is excessively worn and cannot effectively clean the filter assembly 30, the original cleaning structure 90 can be conveniently removed and replaced with a new cleaning structure 90. Of course, in other embodiments, only the cleaning portion 911 can be removed and replaced to save the maintenance cost of the pre-filter.

[0148] In one embodiment, see Fig.14 and Fig.15, the cleaning structure 90 also includes a mounting portion 930, on which a plurality of internal cleaning brushes 910 are disposed, and a mounting groove is correspondingly disposed on the exoskeleton 50, and the mounting portion 930 is snapped into the mounting groove. It can be understood that the mounting portion 930 extends along the axial direction of the exoskeleton 50, and the plurality of internal cleaning brushes 910 are also distributed in the axial direction of the exoskeleton 50. In this way, a plurality of internal cleaning brushes 910 can be installed on the exoskeleton 50 through a mounting portion 930, and the mounting portion 930 and the exoskeleton 50 can be disassembled and assembled to replace the plurality of internal cleaning brushes 910, thereby improving the convenience of maintenance of the cleaning structure 90. Of course, in other embodiments, the internal cleaning brush 910 may also be directly connected to the exoskeleton 50.

[0149] In one embodiment, see Fig.18 , some corners of the mounting portion 930 are set to a chamfered shape, and the corners corresponding to the mounting groove are configured to have the same chamfered shape. Among the corners of the mounting portion 930, only some are set to a chamfered shape, and the corners of the mounting groove are set to a corresponding chamfered shape. In this way, it is easy to match the corners corresponding to the mounting portion 930 and the mounting groove, and it plays a fool-proof role in the assembly process of the cleaning structure 90 and the outer frame 50, and can prevent the cleaning structure 90 from being installed upside down. Of course, in other embodiments, fool-proofing can also be performed in other ways, for example, an arrow indicating a direction is set on the outer side of the mounting portion 930.

[0150] In the embodiment of the present invention, the mounting portion 930 and the inner cleaning brush 910 are integrally formed. Specifically, the mounting portion 930 and the inner cleaning brush 910 are integrally formed, so that the inner cleaning brush 910 is conveniently installed and the installation of the inner cleaning brush 910 is stable.

[0151] Without loss of generality, see Fig. 9 There are multiple siphon channels 501, cleaning structures 90 and water flow driving members 540. The multiple siphon channels 501 and the multiple cleaning structures 90 are alternately distributed in the circumferential direction of the side frame 512. The water flow driving member 540 can be arranged corresponding to the cleaning structure 90. In this way, the flushing effect of the pre-filter can be guaranteed.

[0152] It should be noted that the multiple indicated in this solution, unless otherwise specified, should be understood as greater than or equal to two.

[0153] 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.

[0154] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, 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: A valve head and a filter bottle, wherein the filter bottle is formed with a water filter cavity, the valve head is provided with a water inlet and a water outlet connected to the water filter cavity, and a water isolating ring is provided between the water inlet and the water outlet, the water inlet is connected to the outer peripheral side of the water isolating ring, the water outlet is connected to the inner peripheral side of the water isolating ring, and a sewage outlet connected to the water filter cavity is provided on a side of the filter bottle away from the valve head; as well as A filter assembly is arranged in the water filter cavity, the filter assembly comprises a water distributor and a plurality of filter modules connected in sequence, the water distributor is located on a side close to the valve head; A water passage cavity is formed inside the filter module, a first water passage port communicating with the water passage cavity is provided in the axial direction of the filter module, a second water passage port communicating with the water passage cavity is provided in the circumferential direction of the filter module, a filter element is provided in the second water passage port, the filter element is provided in an annular shape, and has an inner annular edge and an outer annular edge, and the outer annular edge is located on one axial side of the inner annular edge; The water distributor forms a first water flow space and a second water flow space. The second water flow space is arranged outside the first water flow space. The axial sides of the first water flow space are respectively connected to the first water flow port and the inner circumference of the water isolation ring, and the axial sides of the second water flow space are respectively connected to the outer circumference of the water isolation ring and the second water flow port, and are provided with guide blades inclined relative to the axial direction.

2. The pre-filter according to claim 1, characterized in that: The pre-filter also includes an outer frame, which is rotatably sleeved outside the filter assembly. The outer frame includes a side frame and a bottom plate, and the bottom plate is connected to the side frame and is located away from the valve head.

3. The pre-filter according to claim 1, characterized in that: The pre-filter also includes an exoskeleton, the exoskeleton forms a siphon flow channel, the exoskeleton includes a side frame and a chassis, the side frame is provided with a siphon hole connected to the siphon flow channel, the chassis is provided with a first discharge port connected to the siphon flow channel, and the first discharge port is connected to the sewage outlet.

4. The pre-filter according to claim 3, characterized in that: An impeller assembly is also provided in the water filter chamber, and the impeller assembly includes a mounting seat and an impeller body rotatably mounted on the mounting seat, the impeller body is coaxially connected to the exoskeleton and fixed in the circumferential direction, and the mounting seat is formed with a first water inlet and a drain that are connected to each other, the first water inlet is connected to the first discharge port, and the drain port is connected to the sewage outlet.

5. The pre-filter according to claim 4, characterized in that: The mounting seat is further provided with a second water inlet, wherein the first water inlet is provided on one axial side of the mounting seat, and the second water inlet is provided on a circumferential side of the mounting seat; The chassis is also provided with a second discharge port extending axially therethrough, and a water retaining structure is formed on opposite sides of the exoskeleton and the mounting seat. The water retaining structure is arranged around the first discharge port, and the second discharge port is located at the periphery of the water retaining structure. The second water inlet is connected to the second discharge port.

6. The pre-filter according to claim 1, characterized in that: The pre-filter also includes an exoskeleton, which is provided with a water flow driving member. The water flow driving member has a driving surface, and the driving surface is arranged at an angle relative to the circumference of the exoskeleton, so that the driving surface can drive the exoskeleton to rotate after being impacted by the water flow.

7. The pre-filter according to claim 6, characterized in that: The water flow driving component includes a hanging part and a driving body, the hanging part is hung on the end of the outer frame close to the water inlet, the driving body is arranged in a conformal manner with the inner circumferential wall of the outer frame, the driving body extends along the circumferential arc of the outer frame, and has a plurality of water baffles distributed at intervals, and the driving surface is formed on the water baffles.

8. The pre-filter according to claim 1, characterized in that: The pre-filter also includes an exoskeleton, the exoskeleton is equipped with a cleaning structure, the cleaning structure includes an inner cleaning brush protruding from the inner circumference of the exoskeleton, the inner cleaning brush includes a cleaning portion, the cleaning portion extends in the axial direction of the exoskeleton, the cleaning portion is arranged corresponding to the filter element, and the cleaning portion is used to clean the filter element.

9. The pre-filter according to claim 8, characterized in that: The cleaning portion extends obliquely relative to the axial direction of the outer frame.

10. The pre-filter according to claim 8, 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.

11. The pre-filter according to claim 8, 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, and the cleaning portion is connected to the outer peripheral side of the base portion.

12. The pre-filter according to claim 11, characterized in that: One of the base parts is correspondingly provided with two cleaning parts extending in opposite directions in the axial direction of the outer frame.

13. The pre-filter according to claim 8, characterized in that: A plurality of cleaning parts are distributed in the axial direction of the outer frame, and one cleaning part is arranged corresponding to one filter element.

14. The pre-filter according to claim 13, characterized in that: Two adjacent cleaning parts are arranged at an acute angle.

15. The pre-filter according to claim 14, characterized in that: The included angle between two adjacent cleaning parts is 60 degrees to 80 degrees.

16. The pre-filter according to claim 8, characterized in that: The cleaning part is configured as a sheet structure; And / or, the cleaning portion has a thickness of 0.5 mm to 1 mm; And / or, the side portion of the cleaning portion distributed in the axial direction of the outer skeleton is inclined.

17. The pre-filter according to claim 1, characterized in that: The filter element is arranged in an annular cone shape, and the cone angle of the filter element is greater than or equal to 150° and less than or equal to 170°.

18. The pre-filter according to claim 1, characterized in that: The filter module includes two support frames distributed along the axial direction, the water passage cavity is formed between the two support frames, each support frame is provided with the second water passage, and the inner ring edge and the outer ring edge of two adjacent filter elements are distributed in opposite directions.

19. The pre-filter according to claim 18, characterized in that: The support frame includes an oblique support portion, and the two ends of the oblique support portion are respectively connected to a first ring portion and a second ring portion, the two oblique support portions of the same filter module are connected through the second ring portion, the first water outlet is provided on the inner periphery of the first ring portion, and the second water outlet is provided on the oblique support portion.

20. The pre-filter according to claim 19, characterized in that The oblique support portion is formed with a plurality of the second water outlets which are distributed at intervals. The filter module is provided with a filter element corresponding to each of the support frames. The filter element is stacked on the surface of the oblique support portion.

21. The pre-filter according to claim 19, characterized in that: The outer diameter of the second ring portion is greater than the outer diameter of the first ring portion.

22. The pre-filter according to claim 19, characterized in that: Each of the supporting frames is provided with the second ring portion, the two second ring portions of the same filter module are detachably connected, and the first ring portions of two adjacent filter modules are detachably connected.

23. The pre-filter according to claim 1, characterized in that: The water distributor includes an annular convex portion protruding away from the filter module, the first water flow space is formed on the inner circumference of the annular convex portion, and the annular convex portion is plugged into the water isolation ring.

24. The pre-filter according to claim 23, characterized in that The annular convex portion is inserted in the water isolating ring, and a sealing ring is disposed on the outer sleeve of the annular convex portion, and abuts against the inner peripheral wall of the water isolating ring through the sealing ring.

25. The pre-filter according to claim 23, characterized in that: The water distributor also includes a first connecting ring and a second connecting ring, the second connecting ring is arranged outside the first connecting ring, the second water flow space is formed between the first connecting ring and the second connecting ring, the annular protrusion is protruded from the first connecting ring and is connected to the first connecting ring in a step shape, and the first connecting ring abuts against the end face of the water-isolating ring.

26. A water system, characterized in that: The pre-filter comprises the pre-filter according to any one of claims 1 to 25.

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