Pre-filter and water system

Abstract

The utility model discloses a prefilter and water consuming system relates to filter technical field, the prefilter includes shell, filter subassembly, reversing piece and drive piece, the shell is equipped with waterproof ring, water inlet is communicated with waterproof ring's outer peripheral side, water outlet is communicated with waterproof ring's inner peripheral side, filter subassembly includes the water distributor, the water distributor is equipped with the reversing piece, and the reversing piece is equipped with the driving piece. A water passing space communicated with the water filtering cavity is formed in the water distributor, the driving piece is in driving connection with the reversing piece and is exposed out of the shell, the reversing piece is movably inserted into the filtering assembly and the water isolation ring, and the reversing piece comprises a communicating part and a blocking part; in the filtering mode, the water inlet is communicated with the water passing space, and a flushing flow path between the water inlet and the inner circumferential side of the reversing piece is partitioned by the partition part; in the flushing mode, the water inlet and the water passing space are separated through the partition part, and the water inlet communicates with the inner circumferential side of the reversing piece through the communicating part. According to the technical scheme provided by the utility model, the filtering effect of the filtering assembly is ensured, and the service life of the pre-filter is prolonged.

Description

Technical Field

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

[0002] As people's living standards continue to improve, their demands for daily water use are also increasing. Due to long-term disrepair and aging of tap water pipes, the water contains a large amount of large particles harmful to the human body, such as mud, rust, and bloodworms, which seriously affect the health of residents. Therefore, a pre-filter is provided, which is equipped with a filter assembly and other components to filter out large particles before the tap water is used. However, while the pre-filter is filtering the water, impurities will adhere to the water filter cavity, especially the surface of the filter assembly. Over time, these impurities will clog the filter assembly and reduce the filtering effect of the filter assembly. Utility Model Content

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

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

[0005] The shell has a water filter cavity and a water inlet, a water outlet and a sewage outlet connected to the water filter cavity. The shell is provided with a water isolation ring between the water inlet and the water outlet. The water inlet is connected to the outer peripheral side of the water isolation ring, and the water outlet is connected to the inner peripheral side of the water isolation ring.

[0006] A filter assembly is disposed in the water filter cavity and is arranged opposite to the water isolation ring. The filter assembly includes a water distributor. The water distributor is disposed at one end of the filter assembly close to the water isolation ring. The water distributor forms a water flow space communicating with the water filter cavity; and

[0007] A reversing member and a driving member, wherein the driving member is drivingly connected to the reversing member and exposed outside the housing, the reversing member is movably inserted into the filter assembly, the water distributor and the water isolation ring to switch the pre-filter between the filtering mode and the flushing mode, the reversing member is hollow, and the inner peripheral side of the reversing member is connected to the water filter chamber and the water outlet, and the reversing member includes a connecting portion and a blocking portion;

[0008] In the filtering mode, on the adjacent side of the water distributor and the water isolation ring, the water inlet is connected to the water flow space, and the water inlet is separated from the inner peripheral side of the reversing member;

[0009] In the flushing mode, on the adjacent side of the water distributor and the water isolation ring, the water inlet is connected to the inner circumference of the reversing member through the connecting portion, and the blocking portion separates the water inlet from the water flow space.

[0010] In one embodiment, the water isolation ring and the water distributor are jointly constructed to form a water flow structure, and the water flow structure is connected to the water inlet;

[0011] On adjacent sides of the water distributor and the water isolation ring, the water flow structure is isolated from the connecting portion in the filtering mode and is connected to the connecting portion in the flushing mode.

[0012] In one embodiment, the water separator and the water distributor are spaced apart, the water-passing structure is the space between the water separator and the water distributor, and the connecting portion and the blocking portion are distributed along the axial direction;

[0013] In the filtering mode, the baffle is located at least between the water isolation ring and the water distributor, so that the water inlet is connected to the water flow space;

[0014] In the flushing mode, the communication portion is at least partially located between the water isolation ring and the water distributor, so that the communication portion is connected to the water inlet, and the blocking portion blocks the water flow space.

[0015] In one embodiment, the communicating portion and the blocking portion are distributed along the axial direction, and the reversing member is axially movable relative to the housing.

[0016] In one embodiment, the driving member includes a driving screw, one of the housing and the reversing member is rotatably connected to the driving screw and axially fixed, and the other of the housing and the reversing member is threadedly connected to the driving screw via a screw connection structure.

[0017] In one embodiment, the screw connection structure is configured as a mounting bracket fixedly disposed in the reversing member, the driving screw is screwed to the mounting bracket, and is rotatably connected to the housing and fixed in the axial direction.

[0018] In one embodiment, the mounting bracket is detachably connected to the reversing member.

[0019] In one embodiment, the mounting bracket includes an inner ring portion and an outer ring portion that are connected to each other, the driving screw is screwed to the inner ring portion, and the outer ring portion is snap-connected to the reversing member.

[0020] In one embodiment, the outer ring portion is connected to a plurality of connecting arms extending in the axial direction, and the plurality of connecting arms are distributed at intervals in the circumferential direction. The connecting arms are provided with a clamping protrusion, and the reversing member is correspondingly provided with a buckle groove, and the clamping protrusion is buckled with the buckle groove. The inner ring portion is arranged opposite to the connecting arms, and is connected to the plurality of connecting arms one by one through a plurality of connecting ribs distributed in the circumferential direction.

[0021] In one embodiment, the buckle groove is formed in the blocking portion, and the outer ring portion is exposed at a port of the reversing member.

[0022] In one embodiment, the driving member further includes a driving knob, which is fixed to the driving screw and located outside the housing.

[0023] In one embodiment, the driving knob is rotatably connected to the housing and is fixed relative to the housing in the axial direction.

[0024] In one embodiment, the reversing member further includes a movable member, the reversing member is transmission-connected to the movable member, the movable member includes a blocking portion, and the pre-filter is further provided with a sewage discharge channel connected to the sewage discharge port, the blocking portion blocks the sewage discharge channel in the filtering mode and opens the sewage discharge channel in the flushing mode.

[0025] In one embodiment, the drainage channel comprises a first channel and a second channel that are coaxially connected, and the first channel is located on a side close to the water filter chamber;

[0026] The movable member further includes an avoidance portion, which is connected to a side of the blocking portion close to the barrier portion;

[0027] In the filtering mode, the blocking portion blocks the first channel. In the flushing mode, the blocking portion is in the second channel and is gapped with the second channel. The avoidance portion passes through the first channel and is gapped with the first channel.

[0028] In one embodiment, a sealing ring is sleeved on the outer periphery of the blocking portion. In the filtering mode, the blocking portion is located in the first channel, and the outer periphery of the sealing ring abuts against the inner peripheral wall of the first channel.

[0029] In one embodiment, the movable member is fixedly connected to the reversing member.

[0030] In one embodiment, the reversing member includes a hollow pipe section, and the hollow pipe section and the movable member are fixedly connected on the inner periphery of the filter assembly.

[0031] In one embodiment, the movable member and the reversing member are connected via threads.

[0032] The utility model also provides a water use system, comprising the aforementioned pre-filter.

[0033] In this utility model, the pre-filter is a backwash filter. In flushing mode and filtering mode, the direction of water flowing through the filter assembly is opposite, and this flow direction is switched by a diverter. A driver is exposed outside the housing for user operation. The user operates the driver to drive the diverter to switch between two positions corresponding to filtering mode and flushing mode.

[0034] When the reversing member is driven to a position corresponding to the filtering mode, the position of the blocking portion can avoid the filtering flow path between the water inlet and the water flow space, and cut off the flushing flow path between the water inlet and the inner circumference of the reversing member, so that the filtering flow path from the water inlet to the water filter chamber through the water flow space is connected. At this time, since the sewage outlet is closed and the water outlet is opened, after the raw water enters from the water inlet, it can directly flow through the water flow space to the filter assembly for filtration, and flow from outside to inside along the radial direction of the filter assembly, thereby filtering the raw water, and the filtered water flows to the water outlet through the inner circumference of the reversing member.

[0035] When the reversing member is driven to the position corresponding to the flushing mode, the position of the blocking portion can separate the water inlet and the water flow space to isolate the filtration flow path between the water inlet filter chamber, and the position of the connecting portion can connect the water inlet to the inner circumference of the reversing member to conduct the flushing flow path from the water inlet to the water filter chamber through the inner circumference of the reversing member. At this time, since the sewage outlet is open and the water outlet is closed, the raw water enters from the water inlet, enters the inner circumference of the reversing member through the connecting portion, and then flows to the filter assembly to flush the filter assembly, and is finally discharged from the sewage outlet.

[0036] Therefore, in this solution, the connection relationship between different structures is changed by the movement of the reversing member relative to the filter assembly and the water-isolating ring, thereby changing the flow direction of the raw water entering the water inlet and the water flow path in the filter chamber, so that the pre-filter can be switched between the filtering mode and the flushing mode, and the internal filtering assembly of the pre-filter can be self-flushing, thereby eliminating the need for manual disassembly and cleaning, facilitating the cleaning of the pre-filter, and thereby increasing the service life of the pre-filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0038] Figure 1A schematic diagram of the external structure of an embodiment of a pre-filter provided by the utility model;

[0039] Figure 2 This is a schematic cross-sectional view of an embodiment of the pre-filter provided by the present invention in filtering mode;

[0040] Figure 3 for Figure 2 A partial enlarged view of point A in the middle;

[0041] Figure 4 for Figure 2 A partial enlarged view of point B in the middle;

[0042] Figure 5 for Figure 2 A partial enlarged view of point C in the middle;

[0043] Figure 6 for Figure 3 Schematic diagram of the corresponding local structure in flushing mode;

[0044] Figure 7 for Figure 4 Schematic diagram of the corresponding local structure in flushing mode;

[0045] Figure 8 This is a structural diagram of a partial structure of an embodiment of a pre-filter provided by the present utility model;

[0046] Figure 9 This is a structural diagram of a partial structure of an embodiment of a pre-filter provided by the present utility model;

[0047] Figure 10 This is a schematic diagram of the external structure of an embodiment of a filter assembly of a pre-filter provided by the utility model.

[0048] Description of Figure Numbers:

[0049] 10. Filter bottle; 101. Water filter chamber; 102. Sewage outlet; 140. Sewage channel; 141. First channel; 142. Second channel;

[0050] 20. Valve head; 201. Water inlet; 202. Water outlet; 203. Water isolation ring; 22. Metal shell; 23. Plastic lining;

[0051] 30. Filter component;

[0052] 60. Water distributor; 601. Water flow space;

[0053] 720, reversing member; 721, connecting portion; 722, baffle portion; 7221, annular main body; 7222, baffle skirt; 723, hollow pipe section;

[0054] 730, movable part; 731, blocking part; 732, connecting part; 733, avoidance part; 740, mounting bracket; 741, inner ring part; 742, outer ring part; 743, connecting arm; 744, clamping protrusion; 745, connecting rib;

[0055] 800, driving member; 810, driving screw; 820, driving knob;

[0056] 1001. Fastener; 1002. Sealing ring.

[0057] 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

[0058] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0059] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0060] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0061] As people's living standards continue to improve, their demands for daily water use are also increasing. Due to long-term disrepair and aging of tap water pipes, the water contains a large amount of large particles harmful to the human body, such as mud, rust, and bloodworms, which seriously affect the health of residents. Therefore, a pre-filter is provided, which has a filter assembly and other structures inside to filter out large particles before the tap water is used. However, while the pre-filter is filtering the water, impurities will adhere to the water filter cavity, especially the surface of the filter assembly. Over time, this will clog the filter assembly and reduce the filtering effect of the filter assembly.

[0062] The utility model proposes a pre-filter, the internal components of which can realize the switching of the internal flow channel, so that the internal filter assembly can be cleaned regularly to discharge the large particulate matter previously intercepted, thereby eliminating the need for manual disassembly and cleaning of the pre-filter, thereby increasing the service life of the pre-filter.

[0063] Water systems, such as whole-house water purification systems, typically feature a pre-filter to remove large particles from tap water. This not only ensures water safety but also extends the life of appliances, prevents clogged household water pipes, and improves residents' health. The pre-filter is the first coarse filtration device in a whole-house water purification system and is a physical filtration device used to protect back-end water safety.

[0064] See also Figure 1 and Figure 2 In one embodiment of the present invention, the pre-filter includes a shell, the shell has a water filter chamber 101, and a water inlet 201 and a water outlet 202 connected to the water filter chamber 101, and the shell is provided with a water isolation ring 203 between the water inlet 201 and the water outlet 202, the water inlet 201 is connected to the outer peripheral side of the water isolation ring 203, and the water outlet 202 is connected to the inner peripheral side of the water isolation ring 203.

[0065] The shell is usually formed in two parts, so the shell includes a filter bottle 10 and a valve head 20 connected to the filter bottle 10. The water filter chamber 101 is at least provided in the filter bottle 10. The water inlet 201, the water outlet 202 and the water isolation ring 203 are all provided in the valve head 20. The water isolation ring 203 is located on the inner side of the valve head 20. The water inlet 201 is connected to the outer peripheral side of the water isolation ring 203, and the water outlet 202 is connected to the inner peripheral side of the water isolation ring 203, thereby separating the water inlet 201 and the water outlet 202, which is convenient for controlling the connection between the water inlet 201 and the water outlet 202.

[0066] The water inlet 201 is connected to the water supply end of the water supply system, and the water outlet 202 is connected to the water consumption end of the water supply system, thereby filtering the raw water flowing from the water supply end to the water consumption end. It should be noted that the water supply end can be a tap, water tower, or well water, and the water consumption end can be a faucet, shower, or drinking water outlet, which is not specifically limited in this application.

[0067] The valve head 20 and the filter bottle 10 can be connected by a threaded connection. For example, the valve head 20 may be provided with an externally threaded tube, and the mouth of the filter bottle 10 may be provided with corresponding internal threads for threading the externally threaded tube. To reduce the difficulty of pre-filter production and the requirements for assembly test results, as well as to reduce the material cost of the valve head 20, in this embodiment, the filter bottle 10 and the valve head 20 are connected by a fastener 1001.

[0068] The valve head 20 comprises a connected metal outer shell 22 and a plastic inner liner 23. The water inlet 201, water outlet 202, and water isolation ring 203 are all formed in the plastic inner liner 23. This ensures that water flowing through the pre-filter directly contacts the plastic inner liner 23 rather than the metal outer shell 22. This prevents water contamination by metal elements precipitated from the metal outer shell 22 while also enhancing the pre-filter's aesthetics and housing strength. Furthermore, the water isolation ring 203 can be integrally injection-molded into the plastic inner liner 23, facilitating its molding. In other embodiments, the valve head 20 can also be configured directly as a metal component.

[0069] The materials of the metal shell portion 22 and the plastic lining portion 23 are not specifically limited in this application. For example, the material of the metal shell portion 22 can be a copper alloy, such as brass, and the material of the plastic lining portion 23 can be PP (polypropylene) or PVC (polyvinyl chloride).

[0070] The pre-filter also includes a filter assembly 30 disposed within the water filter chamber 101. After raw water (e.g., tap water or well water) flows from an external water source into the water inlet 201, 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. This provides better protection for water purifiers, washing machines, showers, high-end faucets, downstream pipelines, etc., reducing the risk of damage to these devices due to impurity blockage. The form and structure of the filter assembly 30 are not limited. The filter assembly 30 can be equipped with a stainless steel filter mesh or a PP cotton filter mesh to filter impurities.

[0071] The filter assembly 30 is arranged opposite to the water-isolating ring 203. The pre-filter is usually a "T"-shaped structure. The upper "horizontal" position corresponds to the valve head 20, and the left and right ends are the water inlet 201 and the water outlet 202 respectively. The water-isolating ring 203 is arranged toward the lower "vertical", and the main body of the lower "vertical" is the filter bottle 10, which is used to install the filter assembly 30. Its lowermost end (the end away from the water inlet 201) usually has a sewage outlet 102, and its opening and closing are controlled by the sewage valve.

[0072] Please refer to Figure 2 and Figure 10 The filter assembly 30 includes a filter module and a water distributor 60. The water distributor 60 is located at one end of the filter assembly 30 near the water isolation ring 203. The water distributor 60 forms a water flow space 601 that connects to the water filter chamber 101. Raw water can flow from the water flow space 601 to the filter assembly 30, allowing the filter module to filter the raw water. The interior of the water flow space 601 has a spiral flow channel. Raw water entering the water flow space 601 from the water inlet 201 forms a vortex after passing through the water distributor 60. This can improve the uniformity of the raw water flow to the filter assembly 30 and increase the raw water flow rate. In this embodiment, the water distributor 60 is fixedly connected to the cavity wall of the water filter chamber 101, and the filter assembly 30 is fixedly connected to the side of the water distributor 60 facing away from the water isolation ring 203, thereby facilitating the fixed installation of the filter assembly 30. The filter module can be fixed to the water distributor 60 via a snap-fit ​​structure, or it can be directly formed integrally with the water distributor 60.

[0073] See also Figure 2 and Figure 8 The pre-filter further includes a reversing member 720 and a driving member 800. The driving member 800 is driven and connected to the reversing member 720 and is exposed outside the housing. The reversing member 720 is movably inserted into the filter assembly 30, the water distributor 60 and the water isolation ring 203 to switch the pre-filter between the filtering mode and the flushing mode. The reversing member 720 is hollow. The inner peripheral side of the reversing member 720 is connected to the water filter chamber 101 and the water outlet 202. The reversing member 720 includes a connecting portion 721 and a blocking portion 722.

[0074] In the filtering mode, on the adjacent side of the water distributor 60 and the water isolation ring 203 , the water inlet 201 is connected to the water flow space 601 , and the water inlet 201 is separated from the inner circumference of the reversing member 720 ;

[0075] In the flushing mode, on the adjacent side of the water distributor 60 and the water isolation ring 203 , the water inlet 201 is connected to the inner circumference of the reversing member 720 through the connecting portion 721 , and the blocking portion 722 separates the water inlet 201 from the water flow space 601 .

[0076] In the present invention, the pre-filter is a backwash filter. In flushing mode and filtering mode, the direction of water flowing through the filter assembly 30 is opposite, and this flow direction is switched by the reversing member 720. The driver 800 is exposed outside the housing for user operation. By operating the driver 800, the user drives the reversing member 720 to switch between the two positions corresponding to filtering mode and flushing mode.

[0077] Please also refer to Figure 2 and Figure 3 When the reversing member 720 is driven to the position corresponding to the filtering mode, the position of the blocking portion 722 can avoid the filtering flow path between the water inlet 201 and the water flow space 601, and cut off the flushing flow path between the water inlet 201 and the inner circumference of the reversing member 720, so that the filtering flow path from the water inlet 201 to the water filter chamber 101 through the water flow space 601 is connected. At this time, since the sewage outlet 102 is closed and the water outlet 202 is opened, after the raw water enters from the water inlet 201, it can directly pass through the water flow space 601 to the filter assembly 30 for filtration, and flow from outside to inside along the radial direction of the filter assembly 30, thereby filtering the raw water, and the filtered water flows to the water outlet 202 through the inner circumference of the reversing member 720.

[0078] Please also refer to Figure 2 and Figure 6 When the reversing member 720 is driven to the position corresponding to the flushing mode, the position of the blocking portion 722 can isolate the water inlet 201 and the water flow space 601, so as to isolate the filtration flow path between the water inlet 201 and the water filter chamber 101. The position of the connecting portion 721 can allow the water inlet 201 to connect to the inner circumference of the reversing member 720, so as to conduct the flushing flow path from the water inlet 201 to the water filter chamber 101 through the inner circumference of the reversing member 720. At this time, since the sewage outlet 102 is open and the water outlet 202 is closed, the raw water enters from the water inlet 201, enters the inner circumference of the reversing member 720 through the connecting portion 721, and then flows to the filter assembly 30 to flush the filter assembly 30, and finally is discharged from the sewage outlet 102.

[0079] Therefore, in this solution, the movement of the reversing member 720 relative to the filter assembly 30 and the water-isolating ring 203 changes the connectivity between different structures, thereby changing the flow direction of the raw water entering the water inlet 201 and the water flow path in the filter chamber 101, thereby enabling the pre-filter to switch between the filtering mode and the flushing mode, and achieving self-flushing of the internal filter assembly 30 of the pre-filter, thereby eliminating the need for manual disassembly and cleaning, facilitating the cleaning of the pre-filter, and thereby increasing the service life of the pre-filter.

[0080] Among them, the connecting portion 721 and the blocking portion 722 are integrally formed on the reversing member 720, which not only facilitates the assembly of the reversing member 720, but also ensures the overall strength of the reversing member 720, and avoids the installation gap between the connecting portion 721 and the blocking portion 722, which may cause accidental water leakage into the reversing member 720 and cause water flow turbulence.

[0081] In one embodiment, the water-isolating ring 203 and the water distributor 60 are jointly constructed to form a water-passing structure, and the water-passing structure is connected to the water inlet 201; on the adjacent side of the water distributor 60 and the water-isolating ring 203, the water-passing structure is separated from the connecting portion 721 in the filtering mode, and is connected to the connecting portion 721 in the flushing mode.

[0082] In this embodiment, the water flow structure is formed by the water isolation ring 203 and the water distributor 60. The switching member 720 switches between different positions, which can change the relative positions of the blocking portion 722 and the connecting portion 721 with the water flow structure, thereby controlling the connection and disconnection between the water flow structure and the corresponding space, thereby connecting or blocking the corresponding flow path. Of course, in other embodiments, the water flow structure can also be formed only on the water isolation ring 203.

[0083] In one embodiment, please refer to Figure 2 、 Figure 3 、 Figure 6 and Figure 8 The water separator 203 and the water distributor 60 are spaced apart, the water-passing structure is the space between the water separator 203 and the water distributor 60, and the connecting portion 721 and the blocking portion 722 are distributed along the axial direction;

[0084] In the filtering mode, the blocking portion 722 is at least located between the water isolation ring 203 and the water distributor 60 , so that the water inlet 201 is connected to the water flow space 601 ;

[0085] In the flushing mode, the connecting portion 721 is at least partially located between the water isolation ring 203 and the water distributor 60 , so that the connecting portion 721 is connected to the water inlet 201 , and the blocking portion 722 blocks the water flow space 601 .

[0086] In this embodiment, the water-passing structure is configured as the gap between the water-isolating ring 203 and the water distributor 60. The connecting portion 721 and the blocking portion 722 are axially distributed, and the reversing member 720 is axially movable relative to the housing. In different modes, the reversing member 720 axially moves to adjust the connecting portion 721 and the blocking portion 722 relative to the gap between the water-isolating ring 203 and the water distributor 60.

[0087] When the barrier portion 722 is arranged relative to the interval between the water-isolating ring 203 and the water distributor 60, the barrier portion 722 is at least located between the water-isolating ring 203 and the water distributor 60, and the interval at this location is divided into two parts by the barrier portion 722, one part is on the outer peripheral side of the reversing member 720, and the other part is on the outer peripheral side of the reversing member 720. The two parts are not directly connected here, but form the following filtration flow path: the raw water flows from the water inlet 201 through the water space 601 to the water filter chamber 101, and in the water filter chamber 101, flows from the outer peripheral side of the filter component 30 to the inner peripheral side of the filter component 30, and then flows from the outer peripheral side of the reversing member 720 to the inner peripheral side of the reversing member 720, and finally flows to the water outlet 202.

[0088] When the connecting portion 721 is arranged relative to the interval between the water-isolating ring 203 and the water distributor 60, the connecting portion 721 is at least partially located between the water-isolating ring 203 and the water distributor 60. In this way, at this interval, the outer peripheral side of the reversing member 720 can be connected to the inner peripheral side of the reversing member 720 through the connecting portion 721. Since the blocking portion 722 blocks the water flow space 601, the raw water flows from the water inlet 201 through the connecting portion 721 to the inner periphery of the reversing member 720, and then at the position corresponding to the filter assembly 30, it flows from the inner periphery of the reversing member 720 through the filter assembly 30 to the water filter chamber 101 on the outer peripheral side of the filter assembly 30, thereby flushing the filter assembly 30 and finally flowing to the sewage outlet 102.

[0089] Among them, the direction from the connecting part 721 to the blocking part 722 can be the direction from the water isolation ring 203 to the water distributor 60, or it can be that the blocking part 722 includes two parts that block the water flow space 601 and the gap between the water isolation ring 203 and the water distributor 60, and the two parts are respectively located on both sides of the axial direction of the connecting part 721, and the part that blocks the water flow space 601 is on the side of the water distributor 60 away from the water isolation ring 203.

[0090] In other embodiments, the water passing structure can be configured as a through-hole. In one embodiment, the water isolating ring 203 and the water distributor 60 are integrally formed, and the water passing structure can be configured as a through-hole provided in the water isolating ring 203 and the water distributor 60; in another embodiment, the water isolating ring 203 and the water distributor 60 are separately formed, and the water isolating ring 203 and the water distributor 60 are abutted and assembled to form a through-hole.

[0091] And when the water-passing structure is configured as a through-hole, the connecting portion 721 and the blocking portion 722 can be distributed along the circumference of the reversing member 720, that is, the connection relationship between different structures is changed by rotating the reversing member 720 relative to the water distributor 60 and the water-isolating ring 203 to realize the switching between the filtering mode and the flushing mode. At this time, in the filtering mode, the through-hole and the connecting portion 721 are circumferentially misaligned. Of course, the connecting portion 721 and the blocking portion 722 can also be distributed along the axial direction of the reversing member 720, that is, the reversing member 720 realizes the switching between the filtering mode and the flushing mode through axial movement. At this time, in the filtering mode, the through-hole and the connecting portion 721 are axially misaligned.

[0092] In one embodiment, the baffle portion 722 includes an annular main portion 7221 extending axially along the reversing member 720, and a baffle skirt 7222 disposed around the outer periphery of the annular main portion 7221. The annular main portion 7221 is connected to the connecting portion 721 and is slidably connected to the water distributor 60. The baffle skirt 7222 is located between the water distributor 60 and the water isolation ring 203. In flushing mode, the baffle skirt 7222 abuts the water distributor 60 at the outer periphery of the water flow space 601 to seal the water flow space 601. In filtering mode, a gap is defined between the baffle skirt 7222 and the water distributor 60, and the outer periphery of the baffle skirt 7222 and the inner periphery of the housing are aligned, allowing the water inlet 201 to connect to the water flow space 601 through the gap.

[0093] In an embodiment of the present invention, a filtering structure is provided around the circumference of the connecting portion 721. Specifically, the circumferential wall of the connecting portion 721 includes a porous structure that communicates with the water inlet 201. This allows raw water flowing from the water inlet 201 into the water filter chamber 101 to pass through during flushing mode, allowing the raw water to flow into the inner circumference of the filter assembly 30, thereby cleaning the filter assembly 30 from the inside out. However, this raw water may contain impurities. If not filtered, these impurities may be trapped within the inner circumference of the filter assembly 30 during the flushing process. When the pre-filter chamber 101 switches from flushing mode to filtering mode, these impurities flow out of the water outlet 202 along with the filtered raw water, resulting in a poor initial filtration effect. Therefore, a filtering structure is also provided around the circumference of the connecting portion 721. This filtering structure is often configured as a filter screen, which is fixed to the inside or outside of the porous structure or integrally formed with the connecting portion 721. The filter screen can be bonded to the connecting portion 721. In other embodiments, the filtering structure may also be directly provided on the periphery of the water isolation ring 203 by other fixed structures, so that the raw water flowing out of the water inlet 201 is filtered by the filtering structure and then flows to the connecting portion 721 .

[0094] In the embodiments of this utility model, please refer to Figure 2 and Figure 8The reversing member 720 further includes a hollow tube section 723, which is inserted into the inner circumference of the filter assembly 30 and is provided with a through hole that communicates with the water filter chamber 101. Without loss of generality, the connecting portion 721, the baffle portion 722, and the hollow tube section 723 are sequentially connected. A hollow tube section 723 is provided on the side of the baffle portion 722 away from the connecting portion 721. The hollow tube section 723 is typically connected to the end of the water flow portion away from the connecting portion 721 and is inserted into the inner circumference of the filter assembly 30, thereby guiding the reversing member 720 into the inner circumference of the filter assembly 30 and further directing the water flow within the reversing member 720 to the inner circumference of the filter assembly 30. The hollow tube section 723 extends axially along the filter assembly 30. To facilitate the movement of the reversing member 720 relative to the filter assembly 30, a gap is provided between the hollow tube section 723 and the inner circumference of the filter assembly 30.

[0095] In the filtering mode, raw water enters the water filter chamber 101 from the water inlet 201, flows to the filter assembly 30 through the water flow space 601 of the water distributor 60, and flows from outside to inside along the radial direction of the filter assembly 30, thereby filtering the raw water. After the filtered raw water enters the inner periphery of the filter assembly 30, it can enter the hollow pipe section 723, and then flow upward to the water outlet 202 under the action of water pressure; in the flushing mode, raw water enters the water filter chamber 101 from the water inlet 201, enters the inner periphery of the reversing member 720 through the connecting part 721, and continues to flow downward to the hollow pipe section 723, and then sprays toward the filter assembly 30, so that the cleaning water flow is sprayed from outside to inside along the radial direction of the filter assembly 30 to take away impurities on the filter assembly 30, thereby achieving the purpose of flushing the filter assembly 30, and then flows out from the sewage outlet 102.

[0096] In one embodiment, the driving member 800 includes a driving screw 810, and one of the housing and the reversing member 720 is rotatably connected to the driving screw 810 and is axially fixed, and the other of the housing and the reversing member 720 is threadedly connected to the driving screw 810 through a screw structure.

[0097] When the reversing member 720 is screwed to the driving screw 810 through a screw connection structure, the driving screw 810 can rotate relative to the housing, but is fixedly arranged relative to the housing in the axial direction. In this way, when the driving screw 810 is rotated by the user, the driving screw 810 does not move axially relative to the housing, but only rotates. Due to the threaded cooperation between the screw connection structure and the driving screw 810, the reversing member 720 will be driven to move axially relative to the housing, thereby realizing the switching of the reversing member 720 between different axial positions.

[0098] When the shell is screwed to the driving screw 810 through a screw structure, the driving screw 810 can rotate relative to the reversing member 720, but is axially fixed relative to the reversing member 720. In this way, when the driving screw 810 is rotated by the user, the driving screw 810 can move axially relative to the shell. Since the driving screw 810 and the reversing member 720 are relatively fixed in the axial direction, the reversing member 720 will be driven to move axially together. Moreover, since the driving screw 810 and the reversing member 720 are rotatably arranged, the reversing member 720 will not be driven by the driving screw 810 to rotate, which can reduce the movement of the reversing member 720 relative to the water-isolating ring 203 and the filter assembly 30, thereby reducing friction.

[0099] In this embodiment, the driving member 800 drives the reversing member 720 to move axially through a threaded connection. Of course, in other embodiments, the reversing member 720 can be axially driven by a worm gear mechanism, or the driving member 800 can drive the reversing member 720 to rotate through an appropriate method.

[0100] In one embodiment, see Figure 9 The threaded connection structure is configured as a mounting bracket 740 fixedly mounted within the diverter 720. The drive screw 810 is threadedly connected to the mounting bracket 740 and rotatably connected to the housing and axially fixed. Specifically, a threaded hole is provided at the center of the mounting bracket 740, into which the drive screw 810 is threadedly engaged, thereby achieving a threaded connection between the diverter 720 and the drive screw 810. The mounting bracket 740 has multiple water-passing holes spaced around the circumference of the threaded hole, allowing the spaces on both axial sides of the inner circumference of the diverter 720 to communicate, without affecting the flow of water within the diverter 720. In addition, the mounting bracket 740 can, of course, in other embodiments, an internal thread can be set on the inner circumference of the reversing member 720, the driving screw 810 can be fixedly sleeved on the outside of the mounting bracket 740, and an external thread can be set on the outer circumference of the mounting bracket 740. The screw connection between the mounting bracket 740 and the reversing member 720 can be realized.

[0101] In one embodiment, the mounting bracket 740 is detachably connected to the diverter 720. This allows for the removal of either the mounting bracket 740 or the diverter 720 if structural damage occurs, allowing the damaged component to be replaced, thereby reducing pre-filter maintenance costs. In other embodiments, the mounting bracket 740 and the diverter 720 may be integrally formed, or the two may be separately formed and then fixedly connected via welding or adhesive bonding.

[0102] In one embodiment, the mounting bracket 740 is snap-connected to the reversing member 720. Of course, in other embodiments, the mounting bracket 740 and the reversing member 720 may also be connected by plugging, snapping, or screwing.

[0103] Specifically, the mounting bracket 740 includes an inner ring portion 741 and an outer ring portion 742, which are connected to each other. The drive screw 810 is threadedly connected to the inner ring portion 741, and the outer ring portion 742 is snap-fitted to the switching member 720. In other words, the mounting bracket 740 is provided with ring portions on both the inner and outer peripheries. The inner periphery of the inner ring portion 741 is formed with screw holes for the drive screw 810 to be threadedly connected, and the outer ring portion 742 is capable of affixing to the inner periphery of the switching member 720 to ensure that the mounting bracket 740 can be stably snapped onto the switching member 720. Of course, in other embodiments, the outer periphery of the mounting bracket 740 may not be provided with a ring portion.

[0104] In one embodiment, a plurality of axially extending connecting arms 743 are connected to one axial side of the outer ring portion 742. The plurality of connecting arms 743 are spaced apart in the circumferential direction. The connecting arms 743 are provided with latching protrusions 744. The reversing member 720 is provided with corresponding latching grooves, and the latching protrusions 744 engage with the latching grooves. The inner ring portion 741 is disposed opposite the connecting arms 743 and is connected to the plurality of connecting arms 743 in a one-to-one correspondence via a plurality of circumferentially distributed connecting ribs 745. That is, the inner ring portion 741 and the outer ring portion 742 are axially staggered. The outer ring portion 742 is latched with the reversing member 720 via the connecting arms 743. The inner ring portion 741 is disposed opposite the connecting portion 732. This facilitates shortening the force transmission path between the reversing member 720 and the drive screw 810, thereby facilitating driving of the reversing member 720. The inner ring portion 741 and the outer ring portion 742 are connected one-to-one by multiple connecting ribs 745 and multiple connecting arms 743, which is beneficial to enhancing the structural strength of the mounting bracket 740 and increasing the number of force transmission paths between the reversing member 720 and the driving screw 810, thereby avoiding stress concentration between the two. The mounting bracket 740 is not easily damaged, which is beneficial to ensuring the connection stability between the reversing member 720 and the driving screw 810.

[0105] In one embodiment, the buckle groove is formed in the barrier portion 722 , and the outer ring portion 742 is exposed at a port of the reversing member. Specifically, the outer ring portion 742 is exposed at a port on a side of the communication portion 721 away from the barrier portion 722 . Specifically, the connecting portion 721 and the blocking portion 722 are distributed axially from the water isolation ring 203 to the water distributor 60, and the connecting portion 721 has a hole-like structure distributed circumferentially. The mounting bracket 740 is inserted from one side of the connecting portion 721 to the inner circumference of the reversing member 720, wherein the end face of the outer ring portion 742 is preferably flush with the end face of the reversing member 720, and the connecting arm 743 extends into the inner circumference of the reversing member 720 relative to the blocking portion 722. A locking protrusion 744 is provided at the end of the connecting arm 743, which is engaged with the buckle groove of the blocking portion 722 through the locking protrusion 744. In this way, the connection stability between the mounting bracket 740 and the reversing member 720 can be guaranteed, and the mounting bracket 740 has little obstruction effect on the water flow at the connecting portion 721. Furthermore, the inner ring portion 741 is located relative to the blocking portion 722, and the inner ring portion 741 will not block the water flow at the connecting portion 721.

[0106] In one embodiment, please refer to Figure 2 、 Figure 3 and Figure 6 The driving member 800 further includes a driving knob 820, which is fixed to the end of the driving screw 810 and is located outside the housing. In this way, the user can rotate the driving knob 820 to drive the driving screw 810 to rotate relative to the housing. The outer diameter of the driving knob 820 can be set to be larger than the outer diameter of the driving screw 810. Furthermore, anti-slip grooves can be set on the outer periphery of the driving knob 820, or a flat position can be set on the end surface of the driving knob 820 to facilitate user operation. Of course, in other embodiments, the end of the driving screw 810 can also be exposed to the housing and provided with a flat position, so that the user can use a wrench to act on the driving screw 810, thereby driving the driving screw 810 to rotate.

[0107] In one embodiment, the drive knob 820 is rotatably connected to the housing and axially engages with the housing to maintain relative axial fixation. Thus, the engagement between the drive knob 820 and the housing allows the drive screw 810 to be axially fixed relative to the housing, thereby ensuring motion transmission between the drive screw 810 and the reversing member 720. Specifically, the housing may be provided with a groove on the outside, with the drive knob 820 at least partially accommodated within the groove. An annular groove may be provided on either the inner wall of the groove or the outer periphery of the drive knob 820, while a protrusion may be provided on the other side to slidably engage the annular groove. The protrusion may be annular, provided at a single point, or provided in multiple locations spaced apart along the circumference. Thus, through the engagement between the annular groove and the protrusion, the drive knob 820 and the drive screw 810 can be maintained axially fixed relative to the housing and can rotate relative to the housing. Of course, in other embodiments, the drive screw 810 may also engage with the housing to provide relative axial fixation.

[0108] In one embodiment, the reversing member 720 also includes a movable member 730, and the reversing member 720 is transmission-connected to the movable member 730. The movable member 730 includes a sealing portion 731. The shell forms a sewage channel 140 on the side of the filter assembly 30 away from the water distributor 60. The sewage channel 140 is connected to the water filter chamber 101 through the sewage outlet 102. The sealing portion 731 is located in the sewage channel 140, and blocks the sewage channel 140 in the filtering mode, and opens the sewage channel 140 in the flushing mode. In this way, when the reversing member 720 moves to different positions, it can not only switch the flow path between the water inlet 201 and the water filter chamber 101, but also drive the movable member 730 to move to open or close the sewage channel 140. That is, the blocking portion 731 of the movable member 730 realizes a function similar to a valve core at the sewage channel 140. Therefore, a valve body structure does not need to be set separately at the sewage channel 140. When the pre-filter switches the mode, it is only necessary to perform corresponding operations on the valve body at the water outlet 202 and perform corresponding operations on the reversing member 720.

[0109] In one embodiment, please refer to Figure 2 、 Figure 4 and Figure 7The sewage discharge channel 140 has a first channel 141 and a second channel 142 that are coaxially connected, and the first channel 141 is located on a side close to the water filter chamber 101; the movable part 730 also includes a avoidance portion 733, and the avoidance portion 733 is connected to a side of the blocking portion 731 close to the blocking portion 722; in the filtering mode, the blocking portion 731 blocks the first channel 141, and in the flushing mode, the blocking portion 731 is in the second channel 142 and is gap-fitted with the second channel 142, and the avoidance portion 733 passes through the first channel 141 and is gap-fitted with the first channel 141. It can be understood that the inner diameter of the second channel 142 is larger than the outer diameter of the sealing portion 731, the inner diameter of the first channel 141 is larger than the outer diameter of the avoidance portion 733, the inner diameter of the second channel 142 is larger than the inner diameter of the first channel 141, the outer diameter of the blocking portion 731 is larger than the outer diameter of the avoidance portion 733, the avoidance portion 733 and the first channel 141 and the second channel 142 can all be clearance-matched, when the reversing member 720 moves, the avoidance portion 733 will not interfere with the sewage channel 140, and, in the flushing mode, the avoidance portion 733 and the blocking portion 731 will not block the sewage channel 140, so that the sewage channel 140 is opened, and the filter chamber can be connected to the sewage pipe through the gap between the second channel 142 and the avoidance portion 733 and the gap between the first channel 141 and the blocking portion 731 in sequence.

[0110] In one embodiment, please refer to Figure 2 、 Figure 4 and Figure 7 , the outer periphery of the blocking portion 731 is provided with a sealing ring 1002. In the filtering mode, the blocking portion 731 is located in the first channel 141, and the outer periphery of the sealing ring 1002 abuts against the inner peripheral wall of the first channel 141. At this time, the outer diameter of the blocking portion 731 should be equal to or slightly smaller than the inner diameter of the first channel 141. In this way, the blocking portion 731 can achieve sealing cooperation with the inner peripheral wall of the first channel 141 through the sealing ring 1002 provided on the outer periphery, thereby achieving sealing of the first channel 141. Among them, the cross-section of the sealing ring 1002 can be circular, peanut-shaped, or V-shaped. Of course, in other embodiments, in the filtering mode, the blocking portion 731 can also abut against the step surface at the connection between the first channel 141 and the second channel 142, and the end side of the first channel 141 is blocked by the end side of the blocking portion 731, thereby achieving sealing of the first channel 141. At this time, the outer diameter of the blocking portion 731 should be larger than the inner diameter of the first channel 141.

[0111] In one embodiment, please refer to Figure 2 、 Figure 5 and Figure 8The movable member 730 is fixedly connected to the reversing member 720. Thus, when the reversing member 720 is driven to move axially, it can drive the movable member 730 to move axially synchronously, causing the blocking portion 731 to move correspondingly within the sewage discharge passage 140. Of course, in other embodiments, the reversing member 720 and the movable member 730 can also be connected through an intermediate structure. For example, the reversing member 720 and the movable member 730 can be plugged in so as to be axially movable, with an elastic member connected therebetween to transmit axial movement.

[0112] Specifically, the reversing member 720 includes a hollow tube section 723, and the hollow tube section 723 and the movable member 730 are fixedly connected on the inner periphery of the filter assembly 30. Specifically, the avoidance portion 733 further includes a connecting portion 732 at one end away from the blocking portion 731, and the connecting portion 732 extends into the filter assembly 30 and is connected to the hollow tube section 723. The movable member 730 and the reversing member 720 can be connected by threads, that is, one of the hollow tube section 723 and the connecting portion 732 is provided with a screw hole, and the other is provided with an external thread, and the two are fixedly connected by screw connection. In this way, the movable member 730 and the reversing member 720 are formed separately, and different materials can be selected for processing and forming to meet the requirements of reversing and blocking respectively. Of course, in other embodiments, the reversing member 720 and the blocking portion 731 can also be formed as one piece.

[0113] The present invention also provides a water system including a prefilter. The specific structure of the prefilter is similar to that of the above-described embodiments. Since the present water system utilizes all of the technical solutions of all of the above-described embodiments, it at least possesses all of the beneficial effects of the technical solutions of the above-described embodiments, and therefore will not be further detailed here. The water system includes at least the relevant components from the prefilter to the water supply terminal. For example, the water system may include household appliances such as a water heater, a dishwasher, and a water dispenser, as well as accessories such as water pipes for household water supply.

[0114] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A pre-filter, characterized in that: include: The shell has a water filter cavity and a water inlet, a water outlet and a sewage outlet connected to the water filter cavity. The shell is provided with a water isolation ring between the water inlet and the water outlet. The water inlet is connected to the outer peripheral side of the water isolation ring, and the water outlet is connected to the inner peripheral side of the water isolation ring. A filter assembly is provided in the water filter cavity and is arranged opposite to the water isolation ring. The filter assembly includes a water distributor, which is provided at one end of the filter assembly close to the water isolation ring and forms a water flow space communicating with the water filter cavity. as well as A reversing member and a driving member, wherein the driving member is drivingly connected to the reversing member and exposed outside the housing, the reversing member is movably inserted into the filter assembly and the water isolation ring to switch the pre-filter between a filtering mode and a flushing mode, the reversing member is hollow, and the inner peripheral side of the reversing member is connected to the water filter chamber and the water outlet, and the reversing member includes a connecting portion and a blocking portion; In the filtering mode, on the adjacent side of the water distributor and the water isolation ring, the water inlet is connected to the water flow space, and the water inlet is separated from the inner peripheral side of the reversing member; In the flushing mode, on the adjacent side of the water distributor and the water isolation ring, the water inlet is connected to the inner circumference of the reversing member through the connecting portion, and the blocking portion separates the water inlet from the water flow space.

2. The prefilter according to claim 1, wherein The water separator and the water distributor are jointly constructed to form a water flow structure, and the water flow structure is connected to the water inlet; On adjacent sides of the water distributor and the water isolation ring, the water flow structure is isolated from the connecting portion in the filtering mode and is connected to the connecting portion in the flushing mode.

3. The prefilter according to claim 2, wherein: The water separator and the water distributor are spaced apart, the water-passing structure is the space between the water separator and the water distributor, and the connecting portion and the blocking portion are distributed along the axial direction; In the filtering mode, the baffle is located at least between the water isolation ring and the water distributor, so that the water inlet is connected to the water flow space; In the flushing mode, the communication portion is at least partially located between the water isolation ring and the water distributor, so that the communication portion is connected to the water inlet, and the blocking portion blocks the water flow space.

4. The prefilter according to claim 1, wherein The communicating portion and the blocking portion are distributed along the axial direction, and the reversing member is arranged to be axially movable relative to the housing.

5. The prefilter according to claim 1, wherein: The driving member includes a driving screw, one of the housing and the reversing member is rotatably connected to the driving screw and is fixed in the axial direction, and the other of the housing and the reversing member is threadedly connected to the driving screw via a screw connection structure.

6. The prefilter according to claim 5, characterized in that The screw connection structure is configured as a mounting bracket fixedly arranged in the reversing member. The driving screw is screwed to the mounting bracket and is rotatably connected to the housing and fixed in the axial direction.

7. The prefilter according to claim 6, characterized in that The mounting bracket is detachably connected to the reversing member.

8. The pre-filter according to claim 6, wherein: The mounting bracket comprises an inner ring portion and an outer ring portion which are connected to each other. The driving screw is screwed to the inner ring portion. The outer ring portion is snap-connected to the reversing member.

9. The prefilter according to claim 8, characterized in that The outer ring portion is connected to a plurality of connecting arms extending in the axial direction, and the plurality of connecting arms are distributed at intervals in the circumferential direction. The connecting arms are provided with a clamping protrusion, and the reversing member is correspondingly provided with a buckle groove, and the clamping protrusion is buckled with the buckle groove. The inner ring portion is arranged opposite to the connecting arms, and is connected to the plurality of connecting arms one by one through a plurality of connecting ribs distributed in the circumferential direction.

10. The pre-filter according to claim 9, characterized in that The buckle groove is formed in the blocking portion, and the outer ring portion is exposed at the port of the reversing member.

11. The prefilter according to claim 5, wherein The driving member further includes a driving knob, which is fixed to the driving screw and located outside the shell.

12. The pre-filter according to claim 11, wherein The driving knob is rotatably connected to the housing and is fixed relative to the housing in the axial direction.

13. The pre-filter according to any one of claims 1 to 12, characterized in that: The reversing member also includes a movable member, the reversing member is transmission-connected to the movable member, the movable member includes a blocking portion, and the pre-filter is also provided with a sewage discharge channel connected to the sewage discharge port. The blocking portion blocks the sewage discharge channel in the filtering mode and opens the sewage discharge channel in the flushing mode.

14. The pre-filter according to claim 13, wherein: The sewage discharge channel comprises a first channel and a second channel which are coaxially connected, wherein the first channel is located on a side close to the water filter chamber; The movable member further includes an avoidance portion, which is connected to a side of the blocking portion close to the barrier portion; In the filtering mode, the blocking portion blocks the first channel. In the flushing mode, the blocking portion is in the second channel and is gapped with the second channel. The avoidance portion passes through the first channel and is gapped with the first channel.

15. The pre-filter according to claim 14, characterized in that A sealing ring is sleeved on the outer periphery of the blocking portion. In the filtering mode, the blocking portion is located in the first channel, and the outer periphery of the sealing ring abuts against the inner peripheral wall of the first channel.

16. The pre-filter according to claim 15, characterized in that The movable member is fixedly connected to the reversing member.

17. The pre-filter according to claim 16, wherein: The reversing member includes a hollow pipe section, and the hollow pipe section and the movable member are fixedly connected at the inner periphery of the filter assembly; And / or, the movable member and the reversing member are connected via threads.

18. A water system, characterized in that: The pre-filter comprises the pre-filter according to any one of claims 1 to 17.

Images