Pre-filter and water system

Abstract

The utility model discloses a prefilter and a water consuming system, and relates to the technical field of filters, the prefilter comprises a shell, the shell is provided with a water filtering cavity, a water inlet and a water outlet, the shell is provided with a waterproof ring between the water inlet and the water outlet, the water inlet is communicated with the outer peripheral side of the waterproof ring, and the water outlet is communicated with the inner peripheral side of the waterproof ring; the filtering assembly and the water separation ring are oppositely arranged, a water distributor is arranged at the end, close to the water separation ring, of the filtering assembly, and a water passing space communicated with the water filtering cavity is formed by the water distributor; the reversing piece is movably inserted into the filtering assembly, the water distributor and the water isolation ring, the reversing piece is arranged in a hollow shape and movably inserted into the filtering assembly, the water distributor and the water isolation ring, and in the filtering mode, the water inlet is communicated with the water passing space and is separated from the communicating part; in the flushing mode, the water inlet communicates with the reversing piece through the communicating part, and the water inlet and the water passing space are separated through the blocking part. According to the technical scheme provided by the utility model, the filtering effect of the filtering assembly can be 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, large particles harmful to the human body, such as silt, rust, and bloodworms, are present in the water, seriously affecting residents' water safety. Therefore, a pre-filter, equipped with a filter assembly and other components, is required to filter out large particles before the tap water is consumed. However, while the pre-filter is filtering the water, impurities may accumulate in the filter chamber, especially on the surface of the filter assembly. Over time, these impurities may clog the filter assembly and reduce its filtering effectiveness. Utility Model Content

[0003] The main purpose of the utility model is to provide a pre-filter and a water 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 and a water 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. A water distributor is provided 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, which is hollow and movably inserted into the filter assembly, the water distributor, and the water isolation ring, so as to switch the pre-filter between the filtering mode and the flushing mode. 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 circumference 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 together form a water flow structure, and the water flow structure is connected to the water inlet;

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

[0012] In one embodiment, the water separator and the water distributor are integrally formed, and the water passage structure is a through hole provided at the connection between the water separator and the water distributor; or

[0013] The water isolation ring and the water distributor are formed separately, and the water isolation ring and the water distributor are abutted and assembled to form a through hole; or,

[0014] The water isolation ring and the water distributor are formed separately, and the water flow structure is the interval between the water isolation ring and the water distributor.

[0015] In one embodiment, the water separator and the water distributor are spaced apart, and the connecting portion and the blocking portion are distributed along the axial direction;

[0016] 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;

[0017] In the flushing mode, the connecting portion is at least partially located between the water isolation ring and the water distributor, so that the connecting portion is connected to the water inlet, and the blocking portion blocks the water flow space.

[0018] In one embodiment, the baffle portion includes an annular main portion extending along the axial direction of the reversing member, and a baffle skirt arranged around the outer periphery of the annular main portion, the water distributor is provided with a mounting ring groove communicating with the inner periphery of the filter assembly, the water flow space is arranged around the outer periphery of the mounting ring groove, and the annular main portion is slidably inserted into the mounting ring groove;

[0019] In the flushing mode, the baffle skirt covers the water flow space.

[0020] In one embodiment, a water flow portion is further provided on the inner periphery of the annular main body, a first communicating hole is provided on the peripheral wall of the water flow portion, and a blocking portion is provided on the bottom of the mounting ring groove;

[0021] In the filtering mode, a gap is provided between the water passing portion and the blocking portion so that the first communicating hole is in communication with the inner periphery of the filtering assembly;

[0022] In the flushing mode, the blocking portion blocks the communication between the first communication hole and the inner periphery of the filter assembly.

[0023] In one embodiment, the blocking portion is arranged in a ring shape;

[0024] In the flushing mode, the lower edge of the first communicating hole abuts against the blocking portion.

[0025] In one embodiment, the lower edge of the first communicating hole has a first abutting inclined surface facing the blocking portion, and the blocking portion is correspondingly provided with a second abutting inclined surface;

[0026] In the flushing mode, the first abutting slope abuts against the second abutting slope.

[0027] In one embodiment, a guide ring protrusion is provided on the outer edge of the water distributor on a side facing the baffle skirt;

[0028] In the flushing mode, the baffle skirt extends into the inner side of the guide ring protrusion and covers the water flow space of the water distributor.

[0029] In one embodiment, a first sealing ring is provided on the outer periphery of the annular main body, and the first sealing ring is in sealing contact with the inner peripheral wall of the mounting ring groove.

[0030] In one embodiment, a filtering structure is provided on the circumferential ring of the communication portion.

[0031] In one embodiment, the filtering structure has a filtering accuracy of 40 mm to 50 mm; and / or the filtering component has a filtering accuracy of 40 mm to 50 mm.

[0032] In one embodiment, a second sealing ring is provided on the outer periphery of the communication portion away from the barrier portion, and the second sealing ring is in sealing contact with the inner periphery of the water isolation ring; and / or,

[0033] A third sealing ring is provided on the outer periphery of the communication portion on a side close to the barrier portion. In the filtering mode, the third sealing ring is in sealing contact with the inner periphery of the water isolation ring.

[0034] In one embodiment, the reversing member further includes a hollow pipe section, the hollow pipe section is plugged into the inner circumference of the filter assembly, and a second communication hole is provided on the peripheral wall of the hollow pipe section.

[0035] In one embodiment, the connecting portion, the blocking portion and the hollow tube section are axially connected in sequence.

[0036] The utility model also provides a water use system, comprising the pre-filter as described above.

[0037] The technical solution of the present invention is to set a water filter chamber and a water inlet and a water outlet connected to the water filter chamber on the shell, and 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; the filter assembly is arranged in the water filter chamber and is arranged opposite to the water isolation ring; the water distributor is arranged at one end of the filter assembly close to the water isolation ring, and the water distributor forms a water flow space connected to the water filter chamber; the reversing member is arranged in a hollow shape, including a connecting part and a blocking part, and the reversing member is movably inserted into the filter assembly and the water isolation ring, so that the pre-filter can be switched between the filtering mode and the flushing mode.

[0038] In filtering mode, raw water entering through the water inlet flows directly through the water flow space to the filter assembly for filtration, flowing radially from the outside to the inside of the filter assembly, thereby filtering the raw water. Under the action of water pressure, the raw water then flows upward and out of the water outlet through the inner periphery of the reversing member. In flushing mode, the water inlet connects to the inner periphery of the reversing member through the connecting portion, and the baffle separates the water inlet from the water flow space. This allows raw water to enter through the water inlet, enter the inner periphery of the reversing member through the pore structure around the connecting portion, and then flow to the filter assembly to flush the filter assembly before being discharged through the sewage outlet.

[0039] Thus, through the movement of the reversing member relative to the filter assembly, water distributor and water isolation ring, the connectivity relationship between different structures is changed, thereby changing the flow direction of the raw water entering the water inlet, and then changing the water flow path in the water 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

[0040] 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.

[0041] Figure 1 A cross-sectional view of an embodiment of a pre-filter provided by the present invention in filtering mode;

[0042] Figure 2 for Figure 1 A cross-sectional view of the middle pre-filter after the lower portion is disconnected;

[0043] Figure 3 for Figure 1 Cross-sectional view of the pre-filter in flushing mode;

[0044] Figure 4 for Figure 3 A cross-sectional view of the middle pre-filter after the lower portion is disconnected;

[0045] Figure 5 for Figure 1 A schematic structural diagram of a commutator at one angle;

[0046] Figure 6 for Figure 1 A schematic structural diagram of the commutator from another angle;

[0047] Figure 7 for Figure 1 A structural diagram of the commutator at another angle.

[0048] Description of Figure Numbers:

[0049] 10. Filter bottle; 101. Water filter chamber; 102. Sewage outlet;

[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; 602. Mounting ring groove; 603. Guide ring protrusion; 604. Blocking portion; 605. Second abutting inclined surface;

[0053] 720, reversing member; 721, connecting portion; 7211, second sealing ring; 7212, third sealing ring;

[0054] 722, barrier portion; 7221, annular main body; 7222, barrier skirt; 7223, first sealing ring; 7224, water flow portion; 7225, first communication hole; 7226, first abutting inclined surface; 723, hollow tube section; 7231, second communication hole;

[0055] 730. Suction cup; 740. Elastic member.

[0056] 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

[0057] 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.

[0058] 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.

[0059] 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.

[0060] The present invention proposes a pre-filter, the interior of which can realize the switching of the internal flow channel, so that the filter component 30 inside it 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.

[0061] Water systems, such as whole-house water purification systems, typically feature a pre-filter to filter out large particles from tap water. This not only ensures water safety but also extends the life of appliances, prevents clogged household water pipes, and improves residents' health. The pre-filter is the first coarse filtration device in a whole-house water purification system. It is a physical filter that primarily intercepts large particles larger than 40 microns, ensuring back-end water safety.

[0062] See also Figure 1 and Figure 3In 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.

[0063] 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.

[0064] 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.

[0065] The valve head 20 and filter bottle 10 are primarily connected by a threaded connection. For example, the valve head 20 is provided with an externally threaded tube, and the mouth of the filter bottle 10 is provided with corresponding internal threads for threading the externally threaded tube. To reduce the production difficulty of the prefilter, lower the requirements for assembly testing, and lower the material cost of the valve head 20, in this embodiment, the filter bottle 10 and valve head 20 are fastened together using fasteners.

[0066] The valve head 20 comprises a connected metal outer shell 22 and a plastic inner lining 23. The water inlet 201, water outlet 202, and water isolation ring 203 are all formed in the plastic inner lining 23. This ensures that water flowing through the pre-filter directly contacts the plastic inner lining 23 rather than the metal outer shell 22, preventing water contamination by metal elements precipitated from the metal outer shell 22 while also enhancing the pre-filter's aesthetics and outer shell strength. Furthermore, the water isolation ring 203 can be integrally injection-molded into the plastic inner lining 23, facilitating its molding. In other embodiments, the valve head 20 can also be configured directly as a metal component.

[0067] 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).

[0068] 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, and the filter assembly 30 can be a stainless steel filter or a PP cotton filter.

[0069] The filter assembly 30 is arranged opposite to the water-isolating ring 203. The pre-filter is usually a "T"-shaped structure. The left and right ends of the upper "horizontal" position are the water inlet 201 and the water outlet 202 respectively. The water-isolating ring 203 is arranged toward the lower "vertical", and the lower "vertical" 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 the sewage valve is used to control its opening and closing.

[0070] The filter assembly 30 also includes a water distributor 60, which is located at one end of the filter assembly 30 near the water isolation ring 203. The water distributor 60 defines a water flow space 601 that communicates with the water filter chamber 101. Raw water can flow from the water flow space 601 to the filter assembly 30, thereby filtering the raw water. The water flow space 601 has a spiral flow path within it. Raw water entering the water flow space 601 from the water inlet 201 forms a swirling flow after passing through the water distributor 60. This improves the uniformity of the raw water flow to the filter assembly 30 and increases the flow rate of the raw water. In this embodiment, the water distributor 60 is fixedly attached to the wall of the water filter chamber 101, and the filter portion of 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 portion of the filter assembly 30 can be fixed to the water distributor 60 via a snap-fit ​​structure, or it can be directly integrated with the water distributor 60.

[0071] In this embodiment, please refer to Figures 1 to 4 A reversing member 720 is further provided in the water filter chamber 101. The reversing member 720 is hollow and movably inserted into the filter assembly 30 and the water isolation ring 203 to switch the pre-filter between the filtering mode and the flushing mode. The reversing member 720 includes a connecting portion 721 and a blocking portion 722.

[0072] In the filtering mode, the water inlet 201 is connected to the water space 601 on the adjacent side of the water distributor 60 and the water isolation ring 203, and the water inlet 201 is separated from the inner circumference of the reversing member 720;

[0073] 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 .

[0074] Specifically, the water-isolating ring 203 and the filter assembly 30 (water distributor 60) are arranged along the axial direction of the water filter chamber 101, and the filter assembly 30 has a hollow structure passing through it along its axial direction for the reversing member 720 to pass through (that is, the water distributor 60 is also configured as a hollow structure), and enables the reversing member 720 to move in the water filter chamber 101 to change the connectivity between different components in the water filter chamber 101, thereby changing the direction of water flow, so that the pre-filter can switch between filtering mode and flushing mode.

[0075] The reversing member 720 is hollow, with one end inserted into the water-isolating ring, thereby connecting its inner circumference to the water outlet 202. The reversing member 720 includes a connecting portion 721 and a blocking portion 722. Both the connecting portion 721 and the blocking portion 722 are hollow. The peripheral wall of the connecting portion 721 has a hole-like structure that connects to the inner side of the reversing member 720. The hole-like structure can communicate with the water inlet 201, and the blocking portion 722 can block the water flow space 601.

[0076] In the filtering mode, the water inlet 201 is connected to the water space 601, and the circumferential porous structure of the connecting part 721 is blocked, so that the filtering flow path between the water inlet 201 and the water filter chamber 101 is connected, and the flushing flow path between the water inlet 201 and the inner peripheral side of the reversing member 720 is blocked on the adjacent sides of the water distributor 60 and the water isolation ring 203, so that after the raw water enters from the water inlet 201, it can directly flow through the water 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 then under the action of water pressure, it flows upward and flows out of the water outlet 202 through the inner periphery of the reversing member 720. In the flushing mode, the water inlet 201 is connected to the inner circumference of the reversing member 720 through the connecting portion 721. On the adjacent side of the water distributor 60 and the water-isolating ring 203, the blocking portion 722 separates the water inlet 201 and the water flow space 601, thereby isolating the filtration flow path between the water inlet 201 and the water filter chamber 101. The flushing flow path between the water inlet 201 and the inner circumference of the reversing member 720 is conducted, so that after the raw water enters from the water inlet 201, it enters the inner circumference of the reversing member 720 through the circumferential porous structure of 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.

[0077] Therefore, in this solution, by arranging a water-isolating ring 203 and a filter assembly 30 (water distributor 60) in the water filter chamber 101, and by the movement of the reversing member 720 relative to the filter assembly 30 (water distributor 60) and the water-isolating ring 203, the connectivity between different structures is changed, thereby changing the flow direction of the raw water entering the water inlet 201 and the water flow path in the water filter chamber 101, thereby enabling the pre-filter to switch between the filtering mode and the flushing mode, and realizing the 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.

[0078] Among them, the connecting portion 721 and the blocking portion 722 are integrally formed, 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 the reversing member 720 to accidentally leak water and cause water flow turbulence.

[0079] Furthermore, the water isolation ring 203 and the water distributor 60 together form a water flow structure, which is connected to the water inlet 201;

[0080] On the adjacent side of the water distributor 60 and the water isolation ring 203 , in the filtering mode, the water flow structure is isolated from the connecting portion 721 , and in the flushing mode, the water flow structure is connected to the connecting portion 721 .

[0081] Specifically, the water isolation ring 203 and the water distributor 60 control the connection and disconnection between the water inlet 201 and the connecting portion 721 by controlling the connection and disconnection between the water flow structure and the connecting portion 721. Therefore, the reversing member 720 can move relative to the water flow structure to control the connection and disconnection between the water flow structure and the connecting portion 721. In the filtering mode, the reversing member 720 is located in the first position, and in the flushing mode, the reversing member 720 is located in the second position.

[0082] Among them, 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 spliced ​​to form a through hole.

[0083] And when the water-passing structure is configured as a through-hole, the first position and the second position can be set 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-blocking 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 hole-like structure are circumferentially misaligned; the first position and the second position can also be set 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 by moving up and down. At this time, in the filtering mode, the through-hole and the hole-like structure are axially misaligned.

[0084] In the embodiment of the present utility model, the water isolation ring 203 and the water distributor 60 are spaced apart, and the connecting portion and the blocking portion are distributed along the axial direction;

[0085] In the filtering mode, the baffle 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 space 601 ;

[0086] In the flushing mode, the communication portion 721 is at least partially located between the water isolation ring 203 and the water distributor 60 , so that the communication portion 721 is connected to the water inlet, and the blocking portion 722 blocks the water flow space 601 .

[0087] Specifically, the water separator 203 and the water distributor 60 are spaced apart, that is, the water flow structure is configured as a gap between the two. At this time, the first position and the second position are set along the axial direction of the reversing member 720, that is, the reversing member 720 switches between the filtering mode and the flushing mode by moving up and down. If the first position is above the second position, the reversing member 720 slides upward to the first position, so that the pre-filter is in the filtering mode (refer to Figure 1 and Figure 2 ), so that the hole structure of the connecting portion 721 is inserted into the water isolation ring 203, so that the connecting portion 721 is blocked, and the corresponding blocking portion 722 also moves upward, so that the blocking portion 722 is separated from the water distributor to release the blocking of the water flow space 601, so that the water flow space 601 is connected to the water inlet 201; the pre-filter is switched from the filtering mode to the flushing mode, and the reversing member 720 slides downward (away from the water isolation ring 203) to the second position (refer to Figure 3 and Figure 4 ), the porous structure of the connecting portion 721 is exposed by the edge of the water isolation ring 203, so that the connecting portion 721 is connected to the water inlet 201. At the same time, the blocking portion 722 moves downward to block the water flow space 601 of the water distributor 60.

[0088] In other embodiments, the first position is below the second position. At this point, the reversing member 720 slides downward to the first position, placing the pre-filter in filtering mode. This allows the porous structure of the connecting portion 721 to be inserted into the water distributor 60, thereby blocking the connecting portion 721. When the pre-filter switches from filtering mode to flushing mode, the reversing member 720 slides upward to the second position, exposing the porous structure of the connecting portion 721 from the edge of the water distributor 60, thereby connecting the connecting portion 721 to the water inlet 201.

[0089] Among them, the driving force for driving the reversing member 720 to move up and down can be various, such as setting an elastic member 740 between the reversing member 720 and the filter assembly 30, and the elastic member 740 can make the reversing member 720 have a tendency to move upward, thereby maintaining the filtering mode; the lower end of the corresponding reversing member 720 is connected to a suction cup 730, and the sewage outlet 102 is provided below the water filter chamber 101. When the water inlet 201 and the sewage outlet 102 are opened, the water pressure can be used to give the suction cup 730 a driving force, so that the suction cup 730 overcomes the elastic member 740. The elastic potential energy moves downward, thereby converting the filtering mode into the flushing mode; or the reversing member 720 is threadedly connected to the water-blocking ring 203 or the filter assembly 30, and the reversing member 720 is driven to rotate by the driving structure, thereby moving the reversing member 720 upward or downward; or a telescopic structure is provided in the filter chamber, which can directly push or pull the reversing member 720 to move, thereby driving the reversing member 720 to move upward or downward; at this time, a guide structure is required between the reversing member 720 and the filter assembly 30 and / or the water-blocking ring 203.

[0090] In order to ensure the barrier effect of the barrier portion 722, in the embodiment of the present invention, please refer to Figures 1 to 7 The blocking portion 722 includes an annular main body 7221 extending axially along the reversing member 720, and a blocking skirt 7222 arranged on the outer periphery of the annular main body 7221. The water distributor 60 is provided with an installation ring groove 602 connected to the inner periphery of the filter assembly 30. The water flow space 601 is arranged on the outer peripheral side of the installation ring groove 602, and the annular main body 7221 is slidably inserted into the installation ring groove 602. In the flushing mode, the blocking skirt 7222 covers the water flow space 601.

[0091] Specifically, the blocking portion 722 includes an annular main portion 7221 extending axially along the diverter 720. The annular main portion 7221 is configured to connect with the connecting portion 721, thereby communicating with the inner circumference of the connecting portion 721. The water distributor 60 is provided with a mounting annular groove 602 that connects to the inner circumference of the filter assembly 30. The bottom of the mounting annular groove 602 is provided with a through hole (in the inner circumference of the mounting annular groove 602) that connects to the interior of the filter assembly 30. The annular main portion 7221 is slidably inserted into the mounting annular groove 602. On the one hand, the annular main portion 7221 guides the sliding movement of the diverter 720 relative to the water distributor 60. On the other hand, the insertion of the annular main portion 7221 into the mounting annular groove 602 helps to block the through hole at the bottom of the mounting annular groove 602, thereby ensuring that the interior of the filter assembly 30 can only communicate with the inner circumference of the diverter 720 through the through hole, thereby connecting to the water outlet 202, thereby reducing the possibility of the through hole connecting to the water inlet 201.

[0092] The water flow space 601 is disposed around the outer periphery of the mounting groove 602, thus separating the water flow space 601 from the mounting groove 602. The mounting groove 602 communicates with the inner periphery of the filter assembly 30, while the water flow space 601 communicates with the outer periphery of the filter assembly 30. Furthermore, because the water flow space 601 of the water distributor 60 is provided with multiple spiral flow channels, the water flow space 601 is provided with multiple spaced and spirally arranged blades. During flushing, if the barrier portion 722 is directly inserted into the water flow space 601, it may interfere with the blades within it. Therefore, a barrier skirt 7222 is provided on the outer periphery of the annular main body 7221. This barrier skirt 7222 directly covers the water inlet side of the water flow space 601, thereby blocking the water flow space 601. Of course, in other embodiments, a sealing portion adapted to the water flow space 601 is provided on the outer periphery of the annular main body 7221 , and the sealing portion is inserted into the water flow space 601 to seal the water flow space 601 .

[0093] Among them, the annular main body 7221 and the barrier skirt 7222 are formed as one piece, which not only facilitates the assembly of the barrier part 722, but also ensures the overall strength of the barrier part 722, and avoids the possibility of an installation gap between the annular main body 7221 and the barrier skirt 7222, thereby causing the barrier part 722 to accidentally leak water.

[0094] When the filter mode and the flushing mode are switched by the rotation of the reversing member 720. In other embodiments, in order to ensure the blocking effect of the blocking portion 722, in the embodiment of the present utility model, please refer to Figures 1 to 7The blocking portion 722 includes an annular main body 7221 extending axially along the reversing member 720, and a plurality of blocking protrusions arranged on the outer periphery of the annular main body 7221. The water distributor 60 is provided with an installation ring groove 602 connected to the inner periphery of the filter assembly 30. The water flow space 601 is arranged on the outer peripheral side of the installation ring groove 602 at intervals, and the annular main body 7221 rotates in the installation ring groove 602. In the flushing mode, the blocking protrusions cover the water flow space 601.

[0095] In order to further facilitate the barrier skirt 7222 to cover the water flow space 601, in the embodiment of the present utility model, the outer edge of the water distributor 60 facing the barrier skirt 7222 is provided with a guide ring protrusion 603;

[0096] In the flushing mode, the barrier skirt 7222 extends into the inner side of the guide ring protrusion 603 and covers the water flow space 601 of the water distributor 60 .

[0097] Specifically, the guide ring protrusion 603 is replaced on the outer edge of the water distributor 60 facing the barrier skirt 7222. When the barrier skirt 7222 moves downward to the outer edge of the water distributor 60, it first contacts the inner edge of the guide ring protrusion 603, so that the barrier skirt 7222 extends into the inner side of the guide ring protrusion 603 and moves along the guide line of the guide ring protrusion 603 toward the water flow space 601 until the barrier skirt 7222 covers the water flow space 601 of the water distributor 60.

[0098] In order to ensure the sealing between the annular main body 7221 and the mounting ring groove 602, in the embodiment of the present utility model, please refer to Figure 2 and Figure 4 A first sealing ring 7223 is provided on the outer periphery of the annular main body 7221, and the first sealing ring 7223 is in sealing contact with the inner peripheral wall of the mounting ring groove 602. Specifically, the first sealing ring 7223 is provided on the outer periphery of the annular main body 7221, with one side of the first sealing ring 7223 contacting the annular main body 7221 and the other side contacting the inner peripheral wall of the mounting ring groove 602, thereby sealing the gap between the annular main body 7221 and the mounting ring groove 602, thereby reducing the filtered raw water from flowing through the gap between the annular main body 7221 and the mounting ring groove 602 to the water inlet 201, or reducing the raw water from directly leaking out of the gap between the annular main body 7221 and the mounting ring groove 602 to the inner periphery of the reversing member 720, thereby affecting the sealing effect of the reversing member 720.

[0099] To facilitate installation of the first sealing ring 7223 and reduce the possibility of displacement of the first sealing ring 7223 as the reversing member 720 slides, a third sealing groove is provided on the outer periphery of the annular main body 7221 or on the inner periphery of the mounting ring groove 602. The first sealing ring 7223 is mounted in the third sealing groove. The cross-section of the first sealing ring 7223 can be circular or V-shaped.

[0100] In the embodiment of the present invention, a water passage portion 7224 is further provided on the inner periphery of the annular main body portion 7221 , a first communication hole 7225 is provided on the peripheral wall of the water passage portion 7224 , and a blocking portion 604 is provided on the bottom of the mounting ring groove 602 ;

[0101] In the filtering mode, a gap is set between the water-passing portion 7224 and the blocking portion 604 so that the first communication hole 7225 is connected to the inner periphery of the filter assembly 30;

[0102] In the flushing mode, the blocking portion 604 blocks the communication between the first communication hole 7225 and the inner periphery of the filter assembly 30 .

[0103] Specifically, the water-passing portion 7224 is provided on the inner periphery of the annular main body 7221, and a gap is set between the outer periphery thereof and the inner periphery of the annular main body 7221, and a first connecting hole 7225 is provided on the peripheral wall of the water-passing portion 7224, so that the inner periphery of the filter assembly 30 can be connected to the first connecting hole 7225 through the gap between the water-passing portion 7224 and the annular main body 7221, thereby facilitating the flow of filtered raw water into the inner periphery of the reversing member 720. In the filtering mode (refer to Figure 2 ), the water portion 7224 is spaced above the blocking portion 604, so that the first communication hole 7225 is connected to the inner periphery of the filter assembly 30 through the gap between the water portion 7224 and the blocking portion 604; in the flushing mode (refer to Figure 4 ), the blocking portion 604 blocks the first communicating hole 7225 or blocks the gap between the water passing portion 7224 and the blocking portion 604 to block the communication between the first communicating hole 7225 and the inner periphery of the filter assembly 30.

[0104] In flushing mode, the diverter 720 sprays water toward the inner periphery of the filter assembly 30 to flush the filter assembly 30, requiring sufficient water pressure. If the inner periphery of the diverter 720 were connected to the inner periphery of the filter assembly 30 through the first connecting hole 7225, this could cause water flow dispersion, affecting the impact of the water flow on the filter assembly 30. Therefore, the blocking portion 604 blocks the connection between the first connecting hole 7225 and the inner periphery of the filter assembly 30, thereby directly connecting the inner periphery of the diverter 720 to the inner periphery of the filter assembly 30 to ensure the impact force of the water flow. In filtering mode, the first connecting hole 7225 increases the water flow area of ​​the water flow portion 7224, thereby increasing the water flow rate from the inner periphery of the filter assembly 30.

[0105] Furthermore, the blocking portion 604 is annularly arranged; in the flushing mode, the lower edge of the first communicating hole 7225 abuts the blocking portion 604. Specifically, the first communicating holes 7225 are arranged at intervals in the circumferential direction of the water flow portion 7224. If the blocking portion 604 blocks the communication between the first communicating hole 7225 and the inner circumference of the filter assembly 30 by blocking the first communicating hole 7225, once a circumferential offset occurs between the water distributor 60 and the reversing member 720, the blocking portion 604 may not be smoothly inserted into the first communicating hole 7225, thereby causing the blocking portion 604 to fail. Therefore, the blocking portion 604 is annularly arranged, and abuts against the lower edge of the first communicating hole 7225 in an annular manner, thereby eliminating the gap between the water flow portion 7224 and the blocking portion 604 and blocking the water flow.

[0106] In other embodiments of the present invention, an insert section is provided below the water flow portion 7224 and the first communication hole 7225. In flushing mode, the insert section is inserted into the inner periphery of the blocking portion 604, and the outer periphery of the insert section abuts the inner periphery of the blocking portion 604, thereby eliminating the gap between the water flow portion 7224 and the blocking portion 604. In this case, a sealing ring is often provided between the two to ensure a seal between the two. Alternatively, the water flow portion 7224 has an abutting surface opposite the blocking portion 604. In flushing mode, the water flow portion 7224 is located at the end of the blocking portion 604, and the abutting surface abuts the end surface of the blocking portion 604.

[0107] When the water-passing portion 7224 has an abutting surface opposite to the blocking portion 604, in this embodiment, the lower edge of the first communicating hole 7225 has a first abutting inclined surface 7226 facing the blocking portion 604, and the blocking portion 604 has a corresponding second abutting inclined surface 605;

[0108] In the flushing mode, the first abutting slope 7226 abuts against the second abutting slope 605 .

[0109] Specifically, the lower edge of the first connecting hole 7225 has a first abutting slope 7226 facing the blocking part 604, and the blocking part 604 is correspondingly provided with a second abutting slope 605, that is, the first abutting slope 7226 and the second abutting slope 605 are both inclined, which helps to increase the abutting area between the water flow part 7224 and the blocking part 604, thereby improving the matching stability between the two.

[0110] In other embodiments, a lower edge of the first communication hole 7225 is provided with an abutting step toward the blocking portion 604 , and in the flushing mode, the end of the blocking portion 604 is inserted into the abutting step.

[0111] In an embodiment of the present invention, a filtering structure is provided around the circumference of the connecting portion 721. Specifically, the peripheral 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 and clean 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.

[0112] The filter mesh can be bonded to the connecting portion 721. In other embodiments, the filter structure can also be directly set on the periphery of the water isolation ring 203 by other fixed structures and cover the first spacer 103, so that the raw water flowing out of the water inlet 201 is filtered by the filter structure and then flows to the connecting portion 721.

[0113] Preferably, the filtration accuracy of the filter structure is 40mm-50mm, and the filtration accuracy of the filter assembly is 40mm-50mm. Preferably, the filtration accuracy of the filter structure is set equal to the filtration accuracy of the filter assembly 30. If the filtration accuracy of the filter structure is lower than the filtration accuracy of the filter assembly 30, a small amount of impurities will inevitably remain on the inner circumference of the filter assembly 30; if the filtration accuracy of the filter structure is higher than the filtration accuracy of the filter assembly 30, unnecessary waste will occur. It should be noted that the filtration accuracy of the filter structure and the filtration accuracy of the filter assembly 30 are equal, that is, they are approximately equal. In other words, the filtration accuracy of the filter structure can be slightly lower or slightly higher than the filtration accuracy of the filter assembly 30. If the filtration accuracy of the filter assembly 30 is 40mm-50mm, then the filtration accuracy of the filter structure is also 40mm-50mm. The filtration accuracy of the filter assembly 30 can specifically be 40mm, 45mm, 50mm, etc., and the filtration accuracy of the filter structure can specifically be 40mm, 45mm, 50mm, etc.

[0114] See also Figures 1 to 4In an embodiment of the present invention, a second sealing ring 7211 is provided on the outer periphery of the communication portion 721 away from the baffle portion 722, and the second sealing ring 7211 is in sealing contact with the inner periphery of the water baffle ring 203. Specifically, a second sealing ring 7211 is provided on the outer periphery of the communication portion 721 away from the baffle portion 722, that is, the second sealing ring 7211 is provided above the hole-shaped structure, and one side of the second sealing ring 7211 is in contact with the communication portion 721, and the other side is in contact with the inner periphery of the water baffle ring 203, thereby sealing the gap between the communication portion 721 and the water baffle ring 203, and reducing the possibility of unfiltered raw water directly leaking out of the gap between the communication portion 721 and the water baffle ring 203 and flowing out of the water outlet 202, thereby affecting the filtering effect of the pre-filter.

[0115] To facilitate installation of the second sealing ring 7211 and reduce the possibility of accidental displacement of the second sealing ring 7211 as the connecting portion 721 slides, a first sealing groove is provided on the outer periphery of the connecting portion 721, away from the barrier portion 722. The second sealing ring 7211 is installed in the first sealing groove. The cross-sectional shape of the second sealing ring 7211 can be circular or V-shaped.

[0116] In another embodiment of the present invention, a third sealing ring 7212 is provided on the outer periphery of the communication portion 721 close to the blocking portion 722 . In the filtering mode, the third sealing ring 7212 seals against the inner periphery of the water isolation ring 203 . Specifically, a third sealing ring 7212 is provided on the outer periphery of the connecting portion 721 close to the blocking portion 722, that is, the second sealing ring 7211 is provided below the porous structure, and in the filtering mode, one side of the third sealing ring 7212 abuts against the connecting portion 721, and the other side abuts against the inner periphery of the water-isolating ring 203, thereby sealing the gap between the connecting portion 721 and the water-isolating ring 203, reducing the raw water from directly penetrating into the inner periphery of the connecting portion 721 from the porous structure in the filtering mode, and affecting the flow direction of the water flow in the water filter chamber 101, affecting the filtering effect of the pre-filter, and in the filtering mode, the second sealing ring 7211 and the third sealing ring 7212 jointly seal the gap between the connecting portion 721 and the water-isolating ring 203, which can form a double-layer seal and improve the sealing effect between the connecting portion 721 and the water-isolating ring 203.

[0117] To facilitate installation of the third sealing ring 7212 and reduce the possibility of displacement of the third sealing ring 7212 as the connecting portion 721 slides, a second sealing groove is provided on the outer periphery of the connecting portion 721 near the barrier portion 722. The third sealing ring 7212 is installed in the second sealing groove. In other embodiments, the second sealing groove is provided on the inner periphery of the water blocker 203. The cross-sectional shape of the third sealing ring 7212 can be circular or V-shaped.

[0118] See also Figure 1 and Figure 3 、 Figures 5 to 7 In the embodiment of the present invention, the reversing member 720 further includes a hollow tube section 723 , which is plugged into the inner periphery of the filter assembly 30 , and a second connecting hole 7231 is provided on the peripheral wall of the hollow tube section 723 .

[0119] Preferably, the connecting portion 721, the baffle 722, and the hollow tube section 723 are sequentially connected. A hollow tube section 723 is provided on the side of the baffle 722 away from the connecting portion 721. This hollow tube section 723 is typically connected to the end of the water-passing portion 7224 away from the connecting portion 721. The hollow tube section 723 passes through the bottom of the mounting ring groove 602 and is inserted into the inner circumference of the filter assembly 30, thereby guiding the diverter 720 into the inner circumference of the filter assembly 30 and, in turn, directing the water flow within the diverter 720 toward the inner circumference of the filter assembly 30. The hollow tube section 723 extends axially along the filter assembly 30. To facilitate movement of the diverter 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. A second connecting hole 7231 is provided on the circumferential wall of the hollow tube section 723, which is connected to the inner circumference of the filter assembly 30.

[0120] In filter mode (see Figure 1 ), the raw water enters the water filter chamber 101 from the water inlet 201, flows through the water flow space 601 of the water distributor 60 to the filter assembly 30, and flows from the outside to the 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, part of it enters the hollow pipe section 723 through the second connecting hole 7231, and then flows upward to the water outlet 202 under the action of water pressure, and the other part flows upward from the gap between the hollow pipe section 723 and the inner periphery of the filter assembly 30, and then enters the inner periphery of the reversing member 720 through the first connecting hole 7225, and flows upward to the water outlet 202; in the flushing mode (refer to Figure 3 ), raw water enters the water filter chamber 101 from the water inlet 201, passes through the connecting portion 721, enters the inner periphery of the reversing member 720, and continues to flow downward to the hollow pipe section 723. It is then sprayed toward the filter assembly 30 through the second connecting hole 7231. The cleaning water is then sprayed from the outside to the inside along the radial direction of the filter assembly 30 to remove impurities on the filter assembly 30 and achieve the purpose of flushing the filter assembly 30. It then flows out through the sewage outlet 102. Therefore, in this embodiment, the second connecting hole 7231 is often configured as a micropore capable of forming a jet-like water flow. The second connecting holes 7231 are spaced axially along the hollow pipe section 723 and are arranged corresponding to the filter assembly 30.

[0121] Furthermore, the connecting portion 721, the blocking portion 722, and the hollow tube section 723 are axially arranged sequentially. That is, the axes of the connecting portion 721, the blocking portion 722, and the hollow tube section 723 coincide. This not only facilitates the movement of the switching member 720 to switch between the filtering mode and the flushing mode, but also helps reduce the movement space required by the switching member 720, thereby reducing the overall size of the pre-filter. In other embodiments, the blocking portion 722, the connecting portion 721, and the hollow tube section 723 are axially arranged sequentially.

[0122] 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.

[0123] The above are merely exemplary embodiments of the present invention and are not intended to limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A pre-filter, characterized in that: include: The shell has a water filter cavity, and a water inlet and a water 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, which is hollow and movably inserted into the filter assembly and the water-isolating ring to switch the pre-filter between a filtering mode and a flushing mode; 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 circumference 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 isolation ring and the water distributor together form a water flow structure, and the water flow structure is connected to the water inlet; On the adjacent side of the water distributor and the water isolation ring, in the filtering mode, the water flow structure is separated from the connecting portion, and in the flushing mode, the water flow structure is connected to the connecting portion.

3. The prefilter according to claim 2, wherein: The water separator and the water distributor are integrally formed, and the water passage structure is a through hole provided at the connection between the water separator and the water distributor; or The water isolation ring and the water distributor are formed separately, and the water isolation ring and the water distributor are abutted and assembled to form a through hole; or, The water isolation ring and the water distributor are formed separately, and the water flow structure is the interval between the water isolation ring and the water distributor.

4. The prefilter according to claim 1, wherein The water separator and the water distributor are spaced apart, 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 connecting portion is at least partially located between the water isolation ring and the water distributor, so that the connecting portion is connected to the water inlet, and the blocking portion blocks the water flow space.

5. The prefilter according to claim 1, wherein: The baffle portion includes an annular main body extending along the axial direction of the reversing member, and a baffle skirt arranged around the outer periphery of the annular main body; the water distributor is provided with a mounting ring groove communicating with the inner periphery of the filter assembly; the water flow space is arranged around the outer periphery of the mounting ring groove; the annular main body is slidably inserted into the mounting ring groove; In the flushing mode, the baffle skirt covers the water flow space.

6. The prefilter according to claim 5, characterized in that The inner periphery of the annular main body is further provided with a water passing portion, the peripheral wall of the water passing portion is provided with a first communicating hole, and the bottom of the mounting ring groove is provided with a blocking portion; In the filtering mode, a gap is provided between the water passing portion and the blocking portion so that the first communicating hole is in communication with the inner periphery of the filtering assembly; In the flushing mode, the blocking portion blocks the communication between the first communication hole and the inner periphery of the filter assembly.

7. The prefilter according to claim 6, wherein: The blocking portion is arranged in a ring shape; In the flushing mode, the lower edge of the first communicating hole abuts against the blocking portion.

8. The pre-filter according to claim 7, characterized in that The lower edge of the first communicating hole has a first abutting inclined surface facing the blocking portion, and the blocking portion is correspondingly provided with a second abutting inclined surface; In the flushing mode, the first abutting slope abuts against the second abutting slope.

9. The prefilter according to claim 5, wherein: The outer edge of the water distributor facing the baffle skirt is provided with a guide ring protrusion; In the flushing mode, the baffle skirt extends into the inner side of the guide ring protrusion and covers the water flow space of the water distributor.

10. The pre-filter according to claim 5, characterized in that: A first sealing ring is provided on the outer periphery of the annular main body, and the first sealing ring is in sealing contact with the inner peripheral wall of the mounting ring groove.

11. The prefilter according to claim 1, wherein The circumferential ring of the communication portion is provided with a filtering structure.

12. The pre-filter according to claim 11, wherein The filtering accuracy of the filtering structure is 40mm-50mm; and / or the filtering accuracy of the filtering component is 40mm-50mm.

13. The pre-filter according to claim 1, wherein: A second sealing ring is provided on the outer periphery of the communication portion away from the blocking portion, and the second sealing ring is in sealing contact with the inner periphery of the water isolation ring; and / or, A third sealing ring is provided on the outer periphery of the communication portion on a side close to the barrier portion. In the filtering mode, the third sealing ring is in sealing contact with the inner periphery of the water isolation ring.

14. The prefilter according to any one of claims 1 to 13, characterized in that The reversing member further includes a hollow pipe section, which is plugged into the inner periphery of the filter assembly, and a second communicating hole is provided on the peripheral wall of the hollow pipe section.

15. The pre-filter according to claim 14, characterized in that The communicating portion, the blocking portion and the hollow tube section are axially connected in sequence.

16. A water system, characterized in that: The method comprises the pre-filter according to any one of claims 1 to 15.

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