Pre-filter and water system

Abstract

The invention discloses a pre-filter and a water system, and relates to the technical field of filters. Wherein the prefilter comprises a shell, a filtering assembly, a reversing piece and a movable piece, the shell is provided with a water filtering cavity, a water inlet, a water outlet and a sewage draining exit, the water inlet, the water outlet and the sewage draining exit are communicated with the water filtering cavity, and the reversing piece is movably inserted into the filtering assembly and used for switching a flow path between the water inlet and the filtering assembly, so that the prefilter has a filtering mode and a flushing mode; the reversing part is in transmission connection with the movable part, the water inlet and the water outlet are formed in one side of the movable part, and the sewage draining exit is formed in the other side of the movable part. The spaces on the two opposite sides of the movable part are separated in the filtering mode and communicated in the flushing mode. The technical scheme provided by the invention has the technical effects that the filtering effect of the filtering assembly is ensured, and the service life of the pre-filter is prolonged.

Description

Technical Field

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

[0002] As people's living standards continue to improve, the requirements for daily water use are getting higher and higher. Due to long-term disrepair and aging of the tap water pipes, there are a large number of large particles in the water that are harmful to the human body, such as mud, rust, and red worms, which seriously affect the health of residents' water use. Therefore, a pre-filter is set up, and the pre-filter is equipped with components such as a filter assembly, which can filter large particles before the tap water is used at the faucet. However, while the pre-filter is filtering the water, impurities will adhere to the filter cavity, especially the surface of the filter assembly, which will clog the filter assembly over time and reduce the filtering effect of the filter assembly. Summary of the invention

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

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

[0005] The shell has a water filter cavity and a water inlet, a water outlet and a sewage outlet connected to the water filter cavity;

[0006] A filter assembly is disposed in the water filter cavity;

[0007] a switching member, movably inserted in the filter assembly, for switching the flow path between the water inlet and the filter assembly, so that the pre-filter has a filtering mode and a flushing mode; and

[0008] A movable part is arranged in the water filter chamber, the reversing part is transmission-connected to the movable part, the water inlet and the water outlet are arranged on one side of the movable part, and the sewage outlet is arranged on the other side of the movable part;

[0009] The spaces on the opposite sides of the movable part are isolated in the filtering mode to form a filtering flow path from the water inlet through the filtering component and the reversing component to the water outlet in sequence, and are connected in the flushing mode to form a flushing flow path from the water inlet through the reversing component and the filtering component to the sewage outlet in sequence.

[0010] In one embodiment, the movable part includes a sealing portion, a first flow port is formed in the water filter chamber, a penetration direction of the first flow port is parallel to a penetration direction of the sewage outlet, and the movable part includes a sealing portion, the sealing portion is axially movable relative to the shell, and the first flow port is blocked in the filtering mode and the first flow port is opened in the flushing mode.

[0011] In one embodiment, a sealing annular surface is provided in the water filter cavity corresponding to the sealing portion, the axial direction of the sealing annular surface is parallel to the penetration direction of the first flow port, the outer peripheral seal of the sealing portion is matched with the sealing annular surface, and can move relative to the sealing annular surface along the axial direction;

[0012] The axial side surface of the blocking portion can be detachably blocked from the first flow opening. The blocking portion is provided with a second flow opening. The second flow opening and the first flow opening are staggered. In the flushing mode, both ends of the second flow opening are respectively connected to the spaces on both axial sides of the blocking portion.

[0013] In one embodiment, a reversing bottom shell is fixedly installed in the water filter chamber, the reversing bottom shell is hollow, the inner circumferential surface of the reversing bottom shell is the sealing annular surface, the blocking portion extends into the inner side of the reversing bottom shell, and is slidably connected to the reversing bottom shell.

[0014] In one embodiment, a plurality of the first flow openings and / or the second flow openings are distributed at intervals along the circumference of the water filter chamber.

[0015] In one embodiment, the first flow opening and the second flow opening are staggered in the circumferential direction and / or radial direction of the water filter chamber.

[0016] In one embodiment, the first flow outlet is located between the water inlet and the sewage outlet, or the sewage outlet is the first flow outlet.

[0017] In one embodiment, the pre-filter further comprises an exoskeleton and an impeller body fixed in the water filter chamber, the exoskeleton is rotatably sleeved outside the filter assembly, the water filter chamber is further fixedly mounted with a mounting seat, the impeller body is rotatably mounted in the mounting seat, the mounting seat is provided with a connected water inlet and a drain, the water inlet is connected to the water inlet, the movable member comprises a blocking portion, and the blocking portion can detachably block at least one of the water inlet and the drain;

[0018] In the filtering mode, the blocking portion blocks at least one of the water inlet and the drain outlet; in the flushing mode, both the water inlet and the drain outlet are opened.

[0019] In one embodiment, the movable part further includes a connecting portion, which is penetrated through the impeller body, has one end fixedly connected to the blocking part, and the other end drivingly connected to the reversing member.

[0020] In one embodiment, the connecting portion is also inserted into the mounting seat, the sealing portion and the exoskeleton are respectively located on both axial sides of the mounting seat, the drain outlet is arranged on the opposite side of the mounting seat and the sealing portion, and the sealing portion can be detachably abutted against the side of the mounting seat away from the exoskeleton, thereby being able to detachably block the drain outlet.

[0021] In one embodiment, the mounting seat and the blocking portion cooperate with each other through a guiding structure, so as to guide the movable member to move relative to the mounting seat.

[0022] In one embodiment, the mounting seat is convexly provided with a guiding protrusion, and the blocking portion is correspondingly provided with a guiding groove, and the guiding protrusion can be movably inserted into the guiding groove.

[0023] In one embodiment, the guide groove and the guide protrusion are correspondingly annular, the guide groove is arranged around the outer circumference of the connecting portion, and the outer circumferential wall of the connecting portion is the inner annular wall of the guide groove.

[0024] In one embodiment, in the filtering mode, the guide protrusion is inserted into the guide groove, and in the flushing mode, the guide protrusion is disengaged from the guide groove.

[0025] In one embodiment, the blocking portion is provided with a second flow opening at the guide groove, the second flow opening penetrates part of the bottom wall of the guide groove and has a portion located outside the guide groove, and in the flushing mode, both ends of the second flow opening are respectively connected to the spaces on both sides of the axial direction of the blocking portion.

[0026] In one embodiment, the pre-filter also includes a reversing bottom shell, which is fixedly connected to the mounting seat, the reversing bottom shell and the outer frame are respectively located on both axial sides of the mounting seat, and the sealing portion extends into the inner side of the reversing bottom shell and is slidably connected to the reversing bottom shell.

[0027] In one embodiment, a sealing member is sleeved on the outer periphery of the sealing portion, and the inner periphery and the outer periphery of the sealing member are respectively in contact with the sealing portion and the sealing annular surface.

[0028] In one embodiment, a mounting ring groove is provided on the outer periphery of the sealing portion, and the sealing member is installed in the mounting ring groove. The groove walls on both axial sides of the mounting ring groove are respectively a first ring wall and a second ring wall. The first ring wall is located on the side of the second ring wall close to the first flow port, and the outer diameter of the first ring wall is smaller than the outer diameter of the second ring wall.

[0029] In one embodiment, the switching member is axially movably inserted into the filter assembly, and the movable member is fixedly connected to the switching member.

[0030] In one embodiment, the switching member includes a switching section and a hollow pipe section connected in sequence along the axial direction, the switching section includes a connecting portion and a blocking portion, the hollow pipe section is inserted in the filter assembly, and a connecting hole is provided on the peripheral wall of the hollow pipe section. The flushing flow path between the connecting hole and the water inlet is connected through the connecting portion and cut off by the blocking portion, and the movable part is fixedly connected to the hollow pipe section.

[0031] In one embodiment, the reversing member and the movable member are fixedly connected by threaded connection.

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

[0033] In the technical solution of the present invention, the pre-filter is of a backwash type, and the working performance of the pre-filter in different working modes can be effectively guaranteed by switching between different positions in a linked manner by the reversing member and the movable member. Due to the transmission between the movable member and the reversing member, while the flow path of the water inlet and the filter assembly is switched by the reversing member, the connection relationship between the sewage outlet and the water inlet can also be changed by the movable member, so that the pre-filter can form a filtering flow path and a flushing flow path in the filtering mode and the flushing mode, respectively. In the flushing mode, the pre-filter can regularly clean the impurities attached to the filter assembly through the flushing flow path, thereby ensuring the filtering effect of the filter assembly and increasing the service life of the pre-filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0035] Figure 1 A schematic diagram of the external structure of an embodiment of a pre-filter provided by the present invention;

[0036] Figure 2A schematic cross-sectional structure diagram of an embodiment of the pre-filter provided by the present invention in filtering mode;

[0037] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0038] Figure 4 for Figure 2 A partial enlarged view of point B in the middle;

[0039] Figure 5 for Figure 2 A partial enlarged view of point C in the middle;

[0040] Figure 6 A schematic cross-sectional structure diagram of an embodiment of the pre-filter provided by the present invention in a flushing mode;

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

[0042] Figure 8 for Figure 6 A partial enlarged view of point E in the middle;

[0043] Fig. 9 A structural schematic diagram of an embodiment of the present invention from a perspective of a movable part of a pre-filter;

[0044] Fig.10 for Fig. 9 A schematic diagram of the structure of the moving parts from another perspective;

[0045] Fig.11 A structural schematic diagram of an embodiment of an impeller assembly of a pre-filter provided by the present invention from one side;

[0046] Fig.12 for Fig.11 A schematic diagram of the structure of the impeller assembly from another perspective;

[0047] Fig.13 A schematic structural diagram of an embodiment of a reversing member of a pre-filter provided by the present invention.

[0048] Description of Figure Numbers:

[0049] 10. filter bottle; 101. water filter chamber; 102. sewage outlet; 104. first flow outlet;

[0050] 20, valve head; 201, water inlet; 202, water outlet;

[0051] 30. Filter component;

[0052] 40, impeller assembly; 402, water inlet; 404, drain outlet; 410, mounting seat; 411, guide convex part; 440, impeller body;

[0053] 50. Exoskeleton;

[0054] 710, reversing bottom shell; 711, sealing ring surface;

[0055] 720, reversing member; 721, connecting portion; 722, blocking portion; 723, hollow pipe section;

[0056] 730, movable part; 731, blocking part; 7311, second flow port; 732, connecting part; 733, mounting ring groove; 7331, first ring wall; 7332, second ring wall; 734, sealing part; 735, guide groove;

[0057] 1001. Fasteners.

[0058] 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

[0059] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0061] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0062] As people's living standards continue to improve, the requirements for daily water use are also getting higher and higher. Due to long-term disrepair and aging of the tap water pipes, there are a large number of large particles in the water that are harmful to the human body, such as mud, rust, and red worms, which seriously affect the health of residents' water use. Therefore, a pre-filter is set up, and a filter component and other components are provided inside the device, which can filter large particles before the tap water is used at the faucet. However, while the pre-filter is filtering the water, impurities will adhere to the filter cavity, especially the surface of the filter component, which will clog the filter component over time and reduce the filtering effect of the filter component.

[0063] The present invention proposes a pre-filter, the internal components of which can realize the switching of internal flow channels, so that the internal filter components 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.

[0064] Water use systems, such as whole-house water purification systems, are usually equipped with pre-filters, which are used to filter large particles of tap water. This not only ensures the safety of residents' water use, but also extends the service life of home appliances, prevents blockage of household water pipes, and improves the health of residents. The pre-filter is the first coarse filtration device in the whole-house water purification system. It is a physical filtration device used to protect the safety of back-end water use.

[0065] See also Figure 1 , Figure 2 and Figure 6In one embodiment of the present invention, the pre-filter includes a shell, and 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. The shell is usually formed in a split body, 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, and the water inlet 201 and the water outlet 202 are both provided in the valve head 20. The water inlet 201 is connected to the water supply end of the water use system, and the water outlet 202 is connected to the water use end of the water use system, thereby filtering the raw water flowing from the water supply end to the water use end. It should be noted that the water supply end can be a tap, a water tower or a well water, and the water use end can be a faucet, a shower or a drinking water outlet, and this application does not make specific limitations on this.

[0066] The connection between the valve head 20 and the filter bottle 10 can be threaded, for example, the valve head 20 is provided with an external threaded tube, and the bottle mouth of the filter bottle 10 is provided with an internal thread for threading the external threaded tube. In order to reduce the production difficulty of the pre-filter and the inspection requirements of the assembly results, and to reduce the material cost of the valve head 20, in this embodiment, the filter bottle 10 and the valve head 20 are connected by a fastener 1001.

[0067] The valve head 20 includes a metal shell and a plastic lining part connected to each other, and the water inlet 201 and the water outlet 202 are both formed on the plastic lining part. In this way, the water flowing through the pre-filter directly contacts the plastic lining part instead of the metal shell, which can avoid the problem of water being contaminated by metal elements precipitated from the metal shell, and can also make the pre-filter have good aesthetics and shell strength.

[0068] The materials of the metal outer shell and the plastic lining are not specifically limited in this application. For example, the material of the metal outer shell may be a copper alloy, such as brass, and the material of the plastic lining may be PP (polypropylene) or PVC (polyvinyl chloride).

[0069] The pre-filter also includes a filter assembly 30 disposed in the water filter chamber 101. After the raw water (such as tap water or well water) flows into the water inlet 201 from the external water source, it can flow through the filter assembly 30 for filtration. The filter assembly 30 can intercept large particles of impurities in the water and remove some precipitated impurities, rust, sand, mud, bacteria and other particulate impurities generated in the pipeline, and play a good protective function for water purifiers, washing machines, showers, high-end faucets, downstream pipelines, etc., reducing the risk of damage to these devices due to clogging by impurities. The form and structure of the filter assembly 30 are not limited. The filter assembly 30 can be equipped with a stainless steel filter or a PP cotton filter to filter impurities.

[0070] The pre-filter is usually a "T"-shaped structure, with the "horizontal" position on the top corresponding to the valve head 20, and the left and right ends being the water inlet 201 and the water outlet 202 respectively. The "vertical" main body on the bottom is the filter bottle 10, which is used to install the filter assembly 30. The axial direction of the water filter chamber 101 also corresponds to the extension direction of this "vertical". The lower end of the filter bottle 10 (the end away from the water inlet 201) usually has a sewage outlet 102, which corresponds to different working modes of the pre-filter and can be switched between open and closed.

[0071] In one embodiment of the present invention, please refer to Figures 2 to 8 The pre-filter further includes a reversing member 720 and a movable member 730. The reversing member 720 can be movably inserted into the filter assembly 30 to switch the flow path between the water inlet 201 and the filter assembly 30, so that the pre-filter has a filtering mode and a flushing mode. The reversing member 720 is transmission-connected to the movable member 730. The water inlet 201 and the water outlet 202 are arranged on one side of the movable member 730, and the sewage outlet 102 is arranged on the other side of the movable member 730. The spaces on the opposite sides of the movable member 730 are separated in the filtering mode to form a filtering flow path from the water inlet 201 to the water outlet 202 in sequence through the filter assembly 30 and the reversing member 720, and are connected in the flushing mode to form a flushing flow path from the water inlet 201 to the sewage outlet 102 in sequence through the reversing member 720 and the filter assembly 30.

[0072] In the technical solution of the present invention, in the filtering mode, the water outlet 202 is opened and the sewage outlet 102 is closed. The raw water entering from the water inlet 201 enters the water filter chamber 101, is filtered by the filter component 30 and then flows to the water outlet 202. At this time, the movable part 730 is in a position to separate the space on both sides; in the flushing mode, the water outlet 202 is closed and the sewage outlet 102 is opened. The water flow entering from the water inlet 201 can flush the filter component 30 in the water filter chamber 101. In this mode, impurities attached to the filter component 30 can be cleaned, and then the sewage can flow out through the sewage outlet 102. At this time, the movable part 730 is in a position to conduct the space on both sides, so that the water inlet 201 and the sewage outlet 102 can be connected.

[0073] Among them, see Figure 2 When the pre-filter is in the filtering mode, the water inlet 201, the water outlet 202 and the filtering assembly 30 can be relatively concentratedly distributed on the same side of the movable part 730, so that the raw water can be filtered through the filtering assembly 30 more efficiently.

[0074] The reversing member 720 is also arranged on the same side of the movable member 730 as the filter assembly 30, and 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 is in a position corresponding to the filtering mode, so that the flushing flow path between the inner peripheral side of the reversing member 720 and the water inlet 201 is in a disconnected state, while the water inlet 201 and the filtering flow path in the water filter chamber 101 are in a conducting state, so that the filtering flow path from the water inlet 201 to the water outlet 202 is conducting.

[0075] Specifically, see Figures 2 to 4 In the filtering mode, the water outlet 202 is opened and the sewage outlet 102 is closed. The water flow from the water inlet 201 will first flow to the part of the water filter chamber 101 on the periphery of the filter component 30, and then flow from the outside to the inside along the radial direction of the filter component 30, thereby filtering the raw water. The filtered water will first flow to the inner side of the reversing member 720, and flow along the reversing member 720 toward the direction of the water outlet 202, and finally flow to the water outlet 202.

[0076] Without loss of generality, when the front filter switches from the filtering mode to the flushing mode, that is, when the water outlet 202 is closed and the sewage outlet 102 is opened, the space on the side where the sewage outlet 102 is located is connected to the external environment, and the space on the side where the water inlet 201 is located is connected to the water supply end through the water inlet 201, thereby making the pressure of the space on the side where the water inlet 201 is greater than the pressure of the space on the side where the sewage outlet 102 is located. This pressure difference causes the movable part 730 to move, so that it can move to a position that connects the spaces on both sides of the movable part 730, so that the flushing flow path between the water filter chamber 101 and the sewage outlet 102 is connected.

[0077] Therefore, driven by the movable part 730, the reversing part 720 will also move accordingly and switch to the corresponding position, so that the filtering flow path between the water inlet 201 and the water filter chamber 101 is disconnected, and a flushing flow path is formed from the water inlet 201 through the reversing part 720 to the filter assembly 30, so that the flushing flow path between the water inlet 201 and the sewage outlet 102 is conductive.

[0078] Specifically, see Figures 6 to 8 In the flushing mode, the water outlet 202 is closed and the sewage outlet 102 is opened. The water flow from the water inlet 201 will first flow to the inner peripheral side of the reversing member 720, and then flow to the filter assembly 30. That is, the water flow will flow from the inside to the outside along the radial direction of the filter assembly 30, thereby flushing the impurities attached to the filter assembly 30, and then the sewage will flow to the sewage outlet 102 through the first flow port 104 and the second flow port 7311 in sequence.

[0079] Therefore, in the technical solution of the present invention, the pre-filter has a flushing mode, and can regularly clean the impurities attached to the filter assembly 30, thereby ensuring the filtering effect of the filter assembly 30 and improving the service life of the pre-filter. In addition, the reversing member 720 and the movable member 730 are linked to switch between different positions, which can effectively ensure the working performance of the pre-filter in different working modes.

[0080] Specifically, the connection between the inner side of the reversing member 720 and the water filter chamber 101 is reflected in that the inner side of the reversing member 720 is connected to the inner side of the filter assembly 30 through the through holes set in the peripheral wall, and the connection between the inner side of the reversing member 720 and the water outlet 202 can be through the port of the reversing member 720, or through the through holes set in the peripheral wall on the end side.

[0081] Without loss of generality, please also refer to Figure 2 , Figure 4 , Figure 6 , Figure 8 and Fig.13 The reversing member 720 and the movable member 730 are arranged axially movable relative to the housing. The reversing member 720 is provided with a connecting portion 721 and a blocking portion 722 distributed in the axial direction. The flushing flow path between the water inlet 201 and the water filter chamber 101 is connected by the connecting portion 721 and blocked by the blocking portion 722. The connecting portion 721 is arranged near one end side of the reversing member 720, and the port of the end side is connected to the water outlet 202. The reversing member 720 is also provided with a connecting structure on the other axial side of the blocking portion 722, and the water filter chamber 101 is connected through the connecting structure. Specifically, the reversing member 720 also includes a hollow pipe section 723, and the hollow pipe section 723 and the connecting portion 721 are respectively arranged on both axial sides of the blocking portion 722. The hollow pipe section 723 is provided with a connecting structure connected to the water filter chamber 101. Of course, in other embodiments, the reversing member 720 can also be rotatably arranged relative to the housing.

[0082] In the filtering mode, raw water enters the filter chamber 101 from the water inlet 201 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 circumference 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 filter chamber 101 from the water inlet 201, enters the inner circumference of the reversing member 720 through the connecting portion 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.

[0083] 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 has a porous structure that can be connected to the water inlet 201, so that in the flushing mode, the raw water flowing into the water filter chamber 101 from the water inlet 201 can pass through, so as to pass the raw water into the inner periphery of the filter assembly 30, and clean the filter assembly 30 from the inside to the outside. However, there may be impurities inside the raw water. If it is not filtered, the impurities in the raw water may be filtered and stored in the inner periphery of the filter assembly 30 during the flushing process. When the pre-filter chamber 101 is converted from the flushing mode to the filtering mode, the impurities in the inner periphery flow out of the water outlet 202 together with the filtered raw water, resulting in a poor initial filtering effect. Therefore, a filtering structure is also provided around the connecting portion 721, and the filtering structure is often configured as a filter net, which is fixed to the inner side or outer side of the porous structure, or integrally formed on the connecting portion 721. Among them, the filter net can be bonded to the connecting portion 721. In other embodiments, the filtering structure may also be directly disposed on the periphery of the water-isolating ring 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 .

[0084] Without loss of generality, at least one of the reversing member 720 and the movable member 730 is connected with an elastic member. Under the action of the elastic member, the reversing member 720 and the movable member 730 can naturally maintain the position corresponding to the filtering mode. When the pre-filter switches from the filtering mode to the flushing mode, the water outlet 202 is closed and the sewage outlet 102 is opened, so that there is a pressure difference between the water inlet 201 and the sewage outlet 102, and the side of the movable member 730 close to the water inlet 201 will be subjected to pressure, so that the movable member 730 moves toward the sewage outlet 102, thereby driving the reversing member 720 to move accordingly, so that a flushing flow path from the water inlet 201 to the sewage outlet 102 is formed in the pre-filter, and at the same time, the elastic member will undergo elastic deformation. When the pre-filter switches from the flushing mode to the filtering mode, the sewage outlet 102 is closed, the water outlet 202 is opened, and the elastic member will restore its deformation, thereby driving the reversing member 720 and the movable member 730 to return to the position corresponding to the filtering mode, that is, the movable member 730 will return to the position separating the spaces on both sides. Thereafter, in the absence of external force, the movable member 730 can be stably in the current position to provide a stable working environment for the filtering process of the pre-filter.

[0085] Of course, in other embodiments, the mode switching of the pre-filter may be controlled by other driving methods, such as manually twisting a screw rod. The user can switch the pre-filter to different modes by twisting the screw rod in different directions.

[0086] In one embodiment, please refer to Figure 2 and Figure 5, the movable member 730 and the reversing member 720 are fixedly connected. Specifically, the movable member 730 includes a connecting portion 732 and a blocking portion 731 connected to each other. The movable member 730 is fixedly connected to the reversing member 720 through the connecting portion 732, and the blocking portion 731 is used to separate the spaces on both sides. Specifically, the connecting portion 732 of the movable member 730 and the hollow pipe section 723 of the reversing member 720 are fixedly connected, the connecting portion 732 of the movable member 730 is inserted into the filter assembly 30 from the axial side of the filter assembly 30 close to the sewage outlet 102, the hollow pipe section 723 of the reversing member 720 is inserted into the filter assembly 30 from the axial side of the filter assembly 30 away from the sewage outlet 102, and the connection between the connecting portion 732 and the hollow pipe section 723 is located on the inner side of the filter assembly 30. In this way, the switching member 720 and the movable member 730 are linked by the fixed connection between the connecting portion 732 and the hollow tube section 723, so as to realize the transmission connection between the switching member 720 and the movable member 730. Of course, in other embodiments, the connecting portion 732 and the hollow tube section 723 may also be movably inserted into each other, or the two may be arranged opposite to each other at a distance, and the transmission is performed between the two through an elastic member, one end of the elastic member is sleeved and abutted on the connecting portion 732, and the other end is sleeved and abutted on the hollow tube section 723.

[0087] Specifically, the connecting portion 732 and the hollow pipe section 723 are fixedly connected by a threaded connection. That is, after the switching member 720 and the movable member 730 are separately formed, they are fixedly connected by a threaded connection. It can be understood that after the switching member 720 and the movable member 730 are assembled, the combined component of the two is equivalent to being inserted from one end of the filter assembly 30 to the other end. In this embodiment, when the switching member 720 and the movable member 730 are assembled, the two are inserted from the two ports of the filter assembly 30 respectively. The structures at the two opposite ends of the switching member 720 and the movable member 730 will not interfere with the insertion of the combined component of the two into the filter assembly 30, and the two and the filter assembly 30 can be easily assembled in place. Of course, in other embodiments, the connecting portion 732 and the hollow pipe section 723 can also be fixedly connected by screw locking, bonding or welding.

[0088] In one embodiment, a first flow port 104 is formed in the water filter chamber 101, and a penetration direction of the first flow port 104 is parallel to a penetration direction of the sewage outlet 102. The movable part 730 includes a blocking portion 731, and the blocking portion 731 is axially movably arranged relative to the shell to block the first flow port 104 in the filtering mode and open the first flow port 104 in the flushing mode.

[0089] It can be understood that parallel means parallel or approximately parallel. In this way, the movement direction of the blocking portion 731 will be parallel to the distribution direction of the water inlet 201 and the sewage outlet 102, and the direction of the force of the pressure difference on the blocking portion 731 can also be parallel to the movement direction, which can more reliably drive the blocking portion 731. In addition, the penetration direction of the first flow port 104 and the movement direction of the movable part 730 are correspondingly set to the same direction, which can facilitate the layout of various structures in the water filter chamber 101 and enhance the structural symmetry of the pre-filter, thereby ensuring the water pressure stability of the pre-filter in the water filter chamber 101, so as to ensure the working stability of the pre-filter.

[0090] Of course, in other embodiments, the setting mode of the first flow port 104 and the movement direction of the movable part 730 can also be adaptively adjusted to other directions, or, when the penetration direction of the first flow port 104 is parallel to the penetration direction of the sewage outlet 102, the movable part 730 can also be rotatably arranged, and a through hole eccentric to the rotation axis is arranged on the blocking part 731. At this time, the movable part 730 can be driven to rotate so that the through hole is opposite to the first flow port 104 or staggered with the first flow port 104. When the two are opposite, the first flow port 104 can be opened, and when the two are staggered, the blocking part 731 blocks the first flow port 104.

[0091] Without loss of generality, please also refer to Figure 2 , Figure 3 , Figure 6 and Figure 7 The first flow port 104 is located between the water inlet 201 and the sewage outlet 102, specifically, between the filter assembly 30 and the sewage outlet 102. The blocking portion 731 can be located on the side of the first flow port 104 close to the filter assembly 30, or on the side of the first flow port 104 close to the sewage outlet 102. Of course, in other embodiments, the sewage outlet 102 can also be used as the first flow port 104.

[0092] In one embodiment, please refer to Figure 2 , Figure 3 , Figure 6 and Figure 7A sealing ring surface 711 is provided in the water filter chamber 101 corresponding to the sealing portion 731, and the axial direction of the sealing ring surface 711 is parallel to the penetration direction of the first flow port 104. The outer peripheral seal of the sealing portion 731 is matched with the sealing ring surface 711 and can move axially relative to the sealing ring surface 711; the axial side of the sealing portion 731 can be detachably sealed on the first flow port 104, and the sealing portion 731 is provided with a second flow port 7311, and the second flow port 7311 and the first flow port 104 are staggered. In the flushing mode, the two ends of the second flow port 7311 are respectively connected to the space on both sides of the axial direction of the sealing portion 731.

[0093] That is, when the blocking portion 731 blocks the first flow port 104 through the solid structure around the second flow port 7311, the solid structure around the first flow port 104 can block the second flow port 7311, thereby isolating the space on both sides of the movable member 730, and when the blocking portion 731 is separated from the first flow port 104, the spaces on both sides of the axial direction of the first flow port 104 and the second flow port 7311 are connected, so that the water inlet 201 can be connected to the sewage outlet 102 through the first flow port 104 and the second flow port 7311. In addition, during the movement of the movable member 730, the outer periphery of the blocking portion 731 always maintains a state of sealing and matching with the sealing annular surface 711, which is conducive to ensuring the isolation of the space on both sides of the movable member 730 in the filtering mode, and avoiding water seepage from the side where the water inlet 201 is located to the side where the sewage outlet 102 is located, which affects the filtering process of the pre-filter. Furthermore, the sealing annular surface 711 can provide guidance for the movement of the blocking portion 731 to ensure that the blocking portion 731 switches smoothly between different positions.

[0094] Of course, in other embodiments, the outer periphery of the sealing portion 731 may be matched with the gap between other structures in the water filter chamber 101, and no flow structure is provided on the sealing portion 731. When the sealing portion 731 leaves the first flow port 104, the flow passes through the gap between the outer periphery of the sealing portion 731 and other structures. The sealing portion 731 is provided with a sealing structure corresponding to the first flow port 104 to ensure the sealing effect and the partition effect on the spaces on both sides.

[0095] Without loss of generality, please also refer to Figure 2 , Figure 3 , Figure 6 and Figure 7, the outer periphery of the blocking portion 731 is sleeved with a sealing member 734, and the inner periphery and outer periphery of the sealing member 734 are respectively in contact with the blocking portion 731 and the sealing annular surface 711. In this way, the blocking portion 731 can achieve a sealing fit between the outer periphery and the sealing annular surface 711 through the sealing member 734, and the sealing member 734 can be filled between the outer periphery of the blocking portion 731 and the sealing annular surface 711 in an interference fit, but the interference should not be too high to ensure that the blocking portion 731 can move relatively smoothly along the sealing annular surface 711. Of course, in other embodiments, the outer periphery of the blocking portion 731 can also be formed with an elastic deformation portion, and the elastic deformation portion and the sealing annular surface 711 are sealed and matched.

[0096] In one embodiment, please refer to Figure 2 , Figure 3 , Figure 6 and Figure 7 , the outer circumference of the blocking portion 731 is provided with a mounting annular groove 733, and the sealing member 734 is installed in the mounting annular groove 733. In this way, under the restriction of the mounting annular groove 733, the sealing member 734 can be stably sleeved on the outer circumference of the blocking portion 731, and when the blocking portion 731 moves relative to the sealing annular surface 711, the sealing member 734 is not easy to move on the blocking portion 731, but can be stably installed in the mounting annular groove 733. Of course, in other embodiments, the blocking portion 731 may not be provided with a mounting annular groove 733 for the sealing member 734 to be installed, but the sealing member 734 is connected to the blocking portion 731 by an inlay manner, so that the stable connection between the sealing member 734 and the blocking portion 731 can also be guaranteed.

[0097] Further, in this embodiment, please refer to Figure 2 , Figure 3 , Figure 6 , Figure 7 and Fig. 9The groove walls on both axial sides of the mounting annular groove 733 are respectively a first annular wall 7331 and a second annular wall 7332, the first annular wall 7331 is located on the side of the second annular wall 7332 close to the first flow port 104, and the outer diameter of the first annular wall 7331 is smaller than the outer diameter of the second annular wall 7332. It can be understood that the side where the first annular wall 7331 is located is also the side close to the water inlet 201, and the side where the second annular wall 7332 is located is also the side close to the sewage outlet 102. When the water inlet 201 and the sewage outlet 102 are both open, the pressure on the side where the first ring wall 7331 is located is higher, and the outer diameter of the first ring wall 7331 is smaller, so that the groove wall of the installation ring groove 733 on this side is lower, which can allow the seal 734 to be more compressed and deformed, and better adapt to the pressure changes on the high-pressure side; the outer diameter of the second ring wall 7332 is larger, so that the groove wall of the installation ring groove 733 on this side is higher, and the second ring wall 7332 can provide additional support, which can effectively prevent the seal 734 from being squeezed out of the groove under high pressure. In addition, the seal 734 is installed into the installation ring groove 733 from the side of the first ring wall 7331, which can reduce the resistance during installation, avoid damage to the seal 734, simplify the installation process of the seal 734, and make it easier to put the seal 734 in place. Without loss of generality, the blocking portion 731 is disc-shaped. Of course, in other embodiments, under the condition that the seal 734 is stably installed, the outer diameters of the first annular wall 7331 and the second annular wall 7332 may be equal, or the outer diameter of the first annular wall 7331 may be larger than the outer diameter of the second annular wall 7332 .

[0098] In one embodiment, if Fig.12 As shown, there are a plurality of first flow openings 104 distributed at intervals along the circumference of the water filter chamber 101. Wherein, a plurality refers to more than two, that is, more than two first flow openings 104 are distributed at intervals in the circumferential direction, so that the range of the flow area can be effectively increased, and the plurality of first flow openings 104 should be distributed around the central axis of the water filter chamber 101, so that the flow area is relatively concentrated, that is, a relatively concentrated flow area with a certain amount of coverage can be formed in the water filter chamber 101, which is conducive to ensuring that the water flows smoothly through the first flow opening 104. Of course, in other embodiments, it is also possible that only one first flow opening 104 is provided, and the blocking portion 731 covers the end side of the first flow opening 104, or the blocking portion 731 enters the first flow opening 104, and the sealing ring provided on the outer peripheral side cooperates with the inner peripheral seal of the first flow opening 104, thereby achieving the blocking of the first flow opening 104.

[0099] In one embodiment, if Fig.11As shown, there are a plurality of second flow openings 7311 spaced apart along the circumference of the water filter chamber 101. That is, more than two second flow openings 7311 are spaced apart along the circumferential direction on the blocking portion 731, so that the range of the flow area can be effectively increased. The plurality of second flow openings 7311 should be distributed around the center of the blocking portion 731 so that the flow area is relatively concentrated, that is, a relatively concentrated flow area with a certain amount of coverage can be formed on the blocking portion 731, which is conducive to ensuring that the water flows smoothly through the second flow openings 7311, and the blocking portion 731 does not need to have a second flow opening 7311 with a large area, which is conducive to ensuring the structural strength of the blocking portion 731. Furthermore, the plurality of second flow openings 7311 can be evenly spaced apart around the center of the blocking portion 731 to improve the flow uniformity of the blocking portion 731. Without loss of generality, the two second flow openings 7311 are evenly spaced around the center of the blocking portion 731, that is, the two second flow openings 7311 are relatively distributed on both sides of the center of the blocking portion 731 in the same radial direction of the blocking portion 731. Of course, in other embodiments, only one second flow opening 7311 may be provided.

[0100] In one embodiment, the first flow opening 104 and the second flow opening 7311 are staggered in the circumferential direction and / or radial direction of the water filter chamber 101. That is, the first flow opening 104 and the second flow opening 7311 are staggered in at least one of the circumferential direction and radial direction of the water filter chamber 101, so that when the blocking portion 731 blocks the first flow opening 104, the second flow opening 7311 will not be opposite to the first flow opening 104, that is, the water inlet 201 and the sewage outlet 102 can be separated, and when the blocking portion 731 leaves the first flow opening 104, the water inlet 201 and the sewage outlet 102 can be connected through the first flow opening 104 and the second flow opening 7311. In particular, when the first flow opening 104 and the second flow opening 7311 are staggered in both the circumferential direction and the radial direction, the path of water flowing from the first flow opening 104 to the second flow opening 7311 can be extended, thereby providing a buffering effect and preventing the water from flowing too fast.

[0101] In one embodiment, if Fig.11 and Fig.12As shown, the first flow opening 104 and the second flow opening 7311 are distributed in multiple intervals along the circumference of the water filter chamber 101, and the multiple first flow openings 104 and the multiple second flow openings 7311 are staggered in the circumferential direction and radial direction of the water filter chamber 101. Specifically, when the blocking portion 731 blocks the first flow opening 104, the first flow opening 104 and the second flow opening 7311 are staggered in the axial direction, and the position of a second flow opening 7311 in the circumferential direction is correspondingly located between two adjacent second flow openings 7311. In addition, if the flow area of ​​a single first flow opening 104 is larger than the flow area of ​​a single second flow opening 7311, the number of first flow openings 104 can be adaptively set to be greater than the number of second flow openings 7311, so that the flow capacities of multiple first flow openings 104 and multiple second flow openings 7311 are equivalent, thereby ensuring the smooth flow of water to the sewage outlet 102.

[0102] In one embodiment, please refer to Figure 2 , Figure 3 , Figure 6 and Figure 7 , the pre-filter also includes a reversing bottom shell 710, the reversing bottom shell 710 is fixedly connected to the mounting seat 410, the reversing bottom shell 710 and the filter assembly 30 are respectively located on both axial sides of the mounting seat 410, and the blocking portion 731 extends into the inner side of the reversing bottom shell 710 and is slidably connected to the reversing bottom shell 710. It can be understood that both axial sides of the reversing bottom shell 710 are provided with openings, which do not interfere with the cooperation between the blocking portion 731 and the first flow port 104 and the communication between the second flow port 7311 and the sewage outlet 102. In this embodiment, the sliding cooperation between the reversing bottom shell 710 and the blocking portion 731 can provide a guiding effect for the axial movement of the movable part 730. Specifically, the outer periphery of the blocking portion 731 can be slidably matched with the inner periphery of the reversing bottom shell 710.

[0103] Without loss of generality, please also refer to Figure 2 , Figure 3 , Figure 6 and Figure 7, the inner circumference of the reversing bottom shell 710 is the sealing annular surface 711, and the blocking portion 731 can be slidably sealed with the inner circumference of the reversing bottom shell 710. In this embodiment, the inner circumference of the reversing bottom shell 710 and the outer circumference of the blocking portion 731 can be sealed, and the inner circumference of the reversing bottom shell 710 can provide a guiding effect for the movement of the blocking portion 731 to ensure that the blocking portion 731 switches smoothly between different positions. Without loss of generality, for the two sides of the reversing bottom shell 710 distributed along the axial direction, one side is fixedly connected to the mounting seat 410, and the other side abuts against the filter bottle 10 to improve the installation stability of the reversing bottom shell 710 in the filter bottle 10, thereby improving the guiding effect on the blocking portion 731 and ensuring the sealing cooperation with the blocking portion 731. Of course, in other embodiments, the sealing annular surface 711 may be formed by the filter bottle 10, and the filter assembly 30 and the sealing annular surface 711 on the filter bottle 10 may be slidably sealed together. Alternatively, the first flow port 104 that cooperates with the sealing portion 731 may be formed by the reversing bottom shell 710.

[0104] In one embodiment, please refer to Figures 2 to 8 The pre-filter also includes an exoskeleton 50 and an impeller body 440 fixed in the water filter chamber 101, the exoskeleton 50 is rotatably mounted on the outside of the filter assembly 30, the water filter chamber 101 is also fixedly installed with a mounting seat 410, the impeller body 440 is rotatably mounted in the mounting seat 410, the mounting seat 410 is provided with a connected water inlet 402 and a drain port 404, the water inlet 402 is connected to the water inlet 201, the movable part 730 includes a sealing portion 731, and the sealing portion 731 can detachably block at least one of the water inlet 402 and the drain port 404. In the filtering mode, the blocking portion 731 blocks at least one of the water inlet 402 and the drain outlet 404, so that the spaces on both sides of the movable part 730 are not connected to each other; in the flushing mode, the water inlet 402 and the drain outlet 404 are both opened, so that the spaces on both sides of the movable part 730 are connected.

[0105] It can be understood that at least one of the drain port 404 and the water inlet 402 is the first flow port 104. The blocking portion 731 can be located on the inner side of the mounting seat 410. In this case, in the flushing mode, the water flowing from the water inlet 402 into the mounting seat 410 will first pass through the second flow port 7311 on the blocking portion 731, and then flow out of the mounting seat 410 through the drain port 404. The mounting seat 410 can also be located on the outer side of the mounting seat 410. In this case, the second flow port 7311 can be located upstream of the water inlet 402 or downstream of the drain port 404. In addition, the blocking portion 731 can be arranged corresponding to one of the water inlet 402 and the drain port 404 to detachably block one of the water inlet 402 and the drain port 404, or it can be capable of blocking the water inlet 402 and the drain port 404 at the same time, and can move relative to the mounting seat 410 to a position where the water inlet 402 and the drain port 404 are simultaneously opened.

[0106] When the blocking portion 731 blocks the first flow port 104 through the solid structure around the second flow port 7311, the solid structure around the first flow port 104 on the mounting seat 410 can block the second flow port 7311, thereby isolating the space on both sides of the axial direction of the blocking portion 731. When the blocking portion 731 is separated from the first flow port 104, the space on both sides of the axial direction of the first flow port 104 and the second flow port 7311 are connected, so that the water inlet 201 can be connected to the sewage outlet 102 through the first flow port 104 and the second flow port 7311.

[0107] In the flushing mode, the water inlet 402 and the drain outlet 404 on the mounting seat 410 are both in an open state, and the water in the water filter chamber 101 can enter the mounting seat 410, thereby driving the impeller body 440 to rotate. Since the exoskeleton 50 and the impeller body 440 are fixedly connected in the circumferential direction, a driving force can be provided for the rotation of the exoskeleton 50. The rotation of the exoskeleton 50 can disturb the water flow in the water filter chamber 101, prevent impurities from being deposited and attached to the filter component 30, the exoskeleton 50 and the side walls of the water filter chamber 101, and reduce the possibility of blockage of the filter component 30, thereby ensuring the filtering effect of the filter component 30.

[0108] In one embodiment, please refer to Figure 2 , Figure 3 , Figure 6 and Figure 7, the connecting portion 732 is provided through the impeller body 440, one end is fixedly connected to the blocking portion 731, and the other end is drivingly connected to the reversing member 720. That is, the blocking portion 731 is located on the side of the impeller body 440 away from the filter assembly 30, a through hole is provided on the impeller shaft of the impeller body 440, the connecting portion 732 is provided through the through hole, and is connected to the reversing member 720 on the other side of the impeller body 440. In this way, the through hole on the impeller shaft can provide a guiding effect for the connecting portion 732 to ensure that the movable member 730 can stably move between different positions. At the same time, the connecting portion 732 can provide a supporting effect for the impeller body 440, and the impeller body 440 can rotate smoothly around the connecting portion 732. Of course, in other embodiments, it can also be that the blocking portion 731 is provided between the mounting seat 410 and the outer frame 50, and the connecting portion 732 is connected to the reversing member 720 after passing through the outer frame 50.

[0109] Further, in this embodiment, please refer to Figure 2 , Figure 3 , Figure 6 and Figure 7 , the connecting portion 732 is also penetrated through the mounting seat 410, the blocking portion 731 and the outer frame 50 are respectively located on the axial sides of the mounting seat 410, the drain port 404 is arranged on the opposite side of the mounting seat 410 and the blocking portion 731, and the blocking portion 731 can be detachably abutted against the side of the mounting seat 410 away from the outer frame 50, and can detachably block the drain port 404. That is, both axial side surfaces of the mounting seat 410 are provided with through holes. The connecting portion 732 penetrates into the through hole of the impeller body 440 from the side of the mounting seat 410 away from the filter assembly 30, and penetrates out from the side of the mounting seat 410 close to the filter assembly 30, and then passes through the outer frame 50, extends into the filter assembly 30 and connects with the reversing member 720. The impeller assembly 40 includes a mounting seat 410 and an impeller body 440, and the blocking portion 731 is located outside the impeller assembly 40, which is conducive to simplifying the structure of the mounting seat 410 and facilitating the modular design of the impeller assembly 40. Of course, in other embodiments, the blocking portion 731 can also be arranged inside the mounting seat 410, and the connecting portion 732 can be sequentially arranged through the impeller body 440, the axial side surface of the mounting seat 410 close to the outer frame 50, and the outer frame 50. In this case, the sealing ring surface 711 corresponds to the inner circumferential surface of the mounting seat 410.

[0110] In one embodiment, the mounting seat 410 and the blocking portion 731 cooperate with each other through a guide structure, so as to guide the movable member 730 to move relative to the impeller assembly 40. In this way, the corresponding guide structure between the mounting seat 410 and the blocking portion 731 cooperates to provide a guide for the movement of the blocking portion 731, thereby further guiding the movable member 730 to move between different positions, so as to ensure the smooth movement of the movable member 730.

[0111] In one embodiment, please refer to Figure 2 , Figure 3 , Figure 6 , Figure 7 , Fig. 9 and Fig.12 The mounting seat 410 is provided with a guide protrusion 411, and the blocking portion 731 is provided with a guide groove 735 correspondingly, and the guide protrusion 411 can be movably inserted into the guide groove 735. It can be understood that the mounting seat 410 is provided with a guide protrusion 411 convexly toward the blocking portion 731, and the guide groove 735 is concavely provided along the axial direction of the blocking portion 731, so that the guide protrusion 411 and the guide groove 735 can provide a guiding effect for the movement of the blocking portion 731 through the plug-in cooperation. The guide protrusion 411 may be annular and arranged outside the through hole on the mounting seat 410 for the connection portion 732 to pass through, and the guide groove 735 may be annular correspondingly; of course, multiple guide protrusions 411 along the annular array may also be provided, and multiple guide grooves 735 may be provided corresponding to the guide protrusions 411, and one guide protrusion 411 may be correspondingly inserted into one guide groove 735, or only one annular guide groove 735 may be provided, and the guide annular groove may be slidably matched with all the guide protrusions 411. Of course, in other embodiments, the guide groove 735 may be provided on the mounting seat 410, and the guide protrusion 411 may be provided on the blocking portion 731.

[0112] Without loss of generality, please also refer to Fig. 9 and Fig.12 , the guide groove 735 and the guide protrusion 411 are correspondingly annular, the guide groove 735 is arranged around the outer periphery of the connecting portion 732, and the outer peripheral wall of the connecting portion 732 is the inner ring wall of the guide groove 735. In this way, the structural strength of the guide groove 735 on the inner ring side can be enhanced to ensure the stable matching of the guide protrusion 411 and the guide groove 735. Further, the guide protrusion 411 is also arranged corresponding to the periphery of the through hole on the mounting seat 410 for the connecting portion 732 to pass through, so that the inner ring wall of the guide protrusion 411 and the inner peripheral wall of the through hole are connected as a whole, and the connecting portion 732 is adaptively inserted into the inner ring side of the guide protrusion 411 and the through hole in turn, and the guide protrusion 411 can further provide a guiding match for the connecting portion 732.

[0113] In one embodiment, see Fig. 9 and Fig.10The blocking portion 731 is provided with a second flow opening 7311 at the guide groove 735, and the second flow opening 7311 penetrates a part of the bottom wall of the guide groove 735. In the flushing mode, the two ends of the second flow opening 7311 are respectively connected to the spaces on both sides of the axial direction of the blocking portion 731. Of course, in other embodiments, the second flow opening 7311 can be formed in other areas of the blocking portion 731, such as the inner circumference or outer circumference of the guide groove 735.

[0114] In this embodiment, the second flow opening 7311 can be located in a relatively central position on the blocking portion 731, and the second flow opening 7311 can be roughly arranged opposite to the sewage outlet 102, which is beneficial to shorten the path from the second flow opening 7311 to the sewage outlet 102 and facilitate the discharge of sewage.

[0115] Since the second flow port 7311 is only arranged to penetrate part of the bottom wall of the guide groove 735, the bottom of the guide groove 735 still has a certain wall body for the guide protrusion 411 to abut and cooperate with. Without loss of generality, when the axial side of the blocking portion 731 abuts against the mounting seat 410, the guide protrusion 411 abuts against the bottom wall of the guide groove 735. In this way, the end point positioning can be further provided for the movement stroke of the movable part 730 in this direction to ensure the reliable cooperation between the blocking portion 731 and the mounting seat 410. Therefore, the movement stroke of the movable part 730 in this direction can be subject to the positioning and stopping effects of multiple structures, and these structures are distributed at different positions along the axial direction of the movable part 730, which is conducive to sharing the force exerted on the movable part 730 at the end of the stroke, so that the structure of the movable part 730 and related components is not easily damaged, which is conducive to improving the service life of the pre-filter.

[0116] Furthermore, on the side of the blocking portion 731 facing the filter assembly 30, the second flow port 7311 can also take in water through the guide groove 735. In particular, when the guide groove 735 is arranged in an annular shape, the guide groove 735 can guide the water flow from the dislocated first flow port 104 to the second flow port 7311 to ensure the smoothness of the water flow. In addition, the second flow port 7311 also has a portion located outside the guide groove 735, so that the inlet area of ​​the blocking portion 731 on the side facing the guide groove 735 can be further improved to facilitate the collection of water flowing out of the dislocated first flow port 104.

[0117] Specifically, on the side of the sealing portion 731 facing the filter assembly 30, the second flow port 7311 has a portion that passes through the guide groove 735 and a portion that is located on the outer peripheral side of the guide groove 735, that is, the second flow port 7311 extends from the outer peripheral wall of the connecting portion 732 across the guide groove 735 toward the outer peripheral direction of the sealing portion 731; on the side of the sealing portion 731 away from the filter assembly 30, the second flow port 7311 has a portion that passes through the guide groove 735 and a portion that is located on the inner and outer peripheral sides of the guide groove 735. It can be understood that the portion of the second flow port 7311 located on the inner peripheral side of the guide groove 735 will be arranged relative to the connecting portion 732. In this way, the flow rate that the second flow port 7311 can carry can be further expanded, thereby ensuring the smooth flow of water in the second flow port 7311.

[0118] Without loss of generality, there are two second flow openings 7311, and the two second flow openings 7311 are evenly spaced in the circumferential direction, that is, the two second flow openings 7311 will be distributed along the same radial direction, and the second flow openings 7311 are in the shape of long strips extending along the radial direction; there are four first flow openings 104, and the four first flow openings 104 are evenly spaced in the circumferential direction, the first flow openings 104 are elliptical, and the first flow openings 104 and the second flow openings 7311 are distributed in the same circumferential direction, that is, the projections of the first flow openings 104 and the second flow openings 7311 along the axial direction are on the same circumference, and the second flow openings 7311 are sandwiched between two adjacent first flow openings 104. Of course, in other embodiments, the first flow openings 104 and the second flow openings 7311 can also be configured as other numbers, which can be adaptively selected within the range of more than two and less than eight according to needs, and multiple first flow openings 104 can also be surrounded by multiple second flow openings 7311.

[0119] In one embodiment, please refer to Figure 2 , Figure 3 , Figure 6 and Figure 7 In the filtering mode, the guide protrusion 411 is inserted into the guide groove 735 , and in the flushing mode, the guide protrusion 411 is disengaged from the guide groove 735 .

[0120] On the one hand, when the pre-filter switches from the filtering mode to the flushing mode, the water outlet 202 switches from the open state to the closed state, and the sewage outlet 102 switches from the closed state to the open state, thereby generating a pressure difference on both sides of the blocking portion 731. Under the action of the pressure difference on both sides, the blocking portion 731 will move in the direction away from the mounting seat 410. At this time, due to the insertion and cooperation of the guide protrusion 411 and the guide groove 735, the blocking portion 731 can move more smoothly. Even if the pressure on the surface of the blocking portion 731 is uneven, the blocking portion 731 will not be deflected due to the limiting cooperation of the guide protrusion 411 and the guide groove 735, which is beneficial to ensuring the movement path of the blocking portion 731.

[0121] On the other hand, when the front filter is switched to the flushing mode, that is, when the sealing portion 731 moves to the position corresponding to the flushing mode, the guide protrusion 411 will be disengaged from the guide groove 735. At this time, the notch of the guide groove 735 will be exposed, thereby providing a certain flow area, so that the flow area of ​​the sealing portion 731 on this side is expanded, which is convenient for collecting the water flowing out from the dislocated first flow port 104, which is beneficial to ensuring the smoothness of the water flow.

[0122] The present invention also proposes a water system, which includes a pre-filter. The specific structure of the pre-filter refers to the above embodiment. Since the water system adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Among them, the water system at least includes related components from the pre-filter to the water end. For example, the water system can include household appliances such as water heaters, dishwashers, and water dispensers, and can also include accessories such as water pipes for domestic water in the whole house.

[0123] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A pre-filter, characterized in that: include: The shell has a water filter cavity and a water inlet, a water outlet and a sewage outlet connected to the water filter cavity; A filter assembly is disposed in the water filter cavity; A switching member, movably inserted in the filter assembly, for switching the flow path between the water inlet and the filter assembly, so that the pre-filter has a filtering mode and a flushing mode; as well as A movable part is arranged in the water filter chamber, the reversing part is transmission-connected to the movable part, the water inlet and the water outlet are arranged on one side of the movable part, and the sewage outlet is arranged on the other side of the movable part; The spaces on the opposite sides of the movable part are isolated in the filtering mode to form a filtering flow path from the water inlet to the water outlet through the filtering component and the reversing component in sequence, and are connected in the flushing mode to form a flushing flow path from the water inlet to the sewage outlet through the reversing component and the filtering component in sequence.

2. The pre-filter according to claim 1, characterized in that: The movable part includes a blocking portion, and a first flow port is formed in the water filter cavity. The penetration direction of the first flow port is parallel to the penetration direction of the sewage outlet. The movable part includes a blocking portion, and the blocking portion is axially movable relative to the shell, and blocks the first flow port in the filtering mode and opens the first flow port in the flushing mode.

3. The pre-filter according to claim 2, characterized in that: A sealing annular surface is provided in the water filter cavity corresponding to the blocking portion, the axial direction of the sealing annular surface is parallel to the penetration direction of the first flow port, the outer peripheral seal of the blocking portion is matched with the sealing annular surface, and can move relative to the sealing annular surface along the axial direction; The axial side surface of the blocking portion can be detachably blocked from the first flow opening. The blocking portion is provided with a second flow opening. The second flow opening and the first flow opening are staggered. In the flushing mode, both ends of the second flow opening are respectively connected to the spaces on both axial sides of the blocking portion.

4. The pre-filter according to claim 3, characterized in that: A reversing bottom shell is fixedly installed in the water filtering cavity. The reversing bottom shell is hollow. The inner peripheral surface of the reversing bottom shell is the sealing annular surface. The blocking portion extends into the inner side of the reversing bottom shell and is slidably connected to the reversing bottom shell.

5. The pre-filter according to claim 3, characterized in that: A plurality of the first flow openings and / or the second flow openings are distributed at intervals along the circumference of the water filter chamber.

6. The pre-filter according to claim 3, characterized in that: The first flow opening and the second flow opening are staggered in the circumferential direction and / or radial direction of the water filter chamber.

7. The pre-filter according to claim 2, characterized in that: The first flow outlet is located between the water inlet and the sewage outlet, or the sewage outlet is the first flow outlet.

8. The pre-filter according to claim 1, characterized in that: The pre-filter further comprises an outer frame and an impeller body fixed in the water filter chamber, the outer frame is rotatably sleeved outside the filter assembly, the water filter chamber is further fixedly mounted with a mounting seat, the impeller body is rotatably mounted in the mounting seat, the mounting seat is provided with a connected water inlet and a drain, the water inlet is connected to the water inlet, the movable part comprises a blocking portion, the blocking portion can detachably block at least one of the water inlet and the drain; In the filtering mode, the blocking portion blocks at least one of the water inlet and the drain outlet; in the flushing mode, both the water inlet and the drain outlet are opened.

9. The pre-filter according to claim 8, characterized in that: The movable part also includes a connecting part, which is penetrated through the impeller body, has one end fixedly connected to the blocking part, and the other end drivingly connected to the reversing part.

10. The pre-filter according to claim 9, characterized in that: The connecting portion is also penetrated through the mounting seat, the sealing portion and the exoskeleton are respectively located on both axial sides of the mounting seat, the drain outlet is arranged on the opposite side of the mounting seat and the sealing portion, and the sealing portion can be detachably abutted against the side of the mounting seat away from the exoskeleton, and can detachably block the drain outlet.

11. The pre-filter according to claim 9, characterized in that: The mounting seat and the blocking portion cooperate with each other through a guiding structure, so as to guide the movable part to move relative to the mounting seat.

12. The pre-filter according to claim 11, characterized in that: The mounting seat is convexly provided with a guiding protrusion, and the blocking portion is correspondingly provided with a guiding groove, and the guiding protrusion can be movably inserted into the guiding groove.

13. The pre-filter according to claim 12, characterized in that: The guide groove and the guide protrusion are correspondingly annular, the guide groove is arranged around the outer circumference of the connecting part, and the outer circumferential wall of the connecting part is the inner annular wall of the guide groove.

14. The pre-filter according to claim 12, characterized in that: In the filtering mode, the guide protrusion is inserted into the guide groove, and in the flushing mode, the guide protrusion is separated from the guide groove.

15. The pre-filter according to claim 12, characterized in that: The blocking portion is provided with a second flow opening at the guide groove, the second flow opening penetrates part of the bottom wall of the guide groove and has a part located outside the guide groove, and in the flushing mode, both ends of the second flow opening are respectively connected to the space on both sides of the axial direction of the blocking portion.

16. The pre-filter according to claim 8, characterized in that: The pre-filter also includes a reversing bottom shell, which is fixedly connected to the mounting seat. The reversing bottom shell and the outer frame are respectively located on both axial sides of the mounting seat. The blocking portion extends into the inner side of the reversing bottom shell and is slidably connected to the reversing bottom shell.

17. The pre-filter according to claim 4, characterized in that: A sealing member is sleeved on the outer periphery of the sealing portion, and the inner periphery and the outer periphery of the sealing member are respectively in contact with the sealing portion and the sealing annular surface.

18. The pre-filter according to claim 17, characterized in that: An installation ring groove is provided on the outer periphery of the sealing portion, and the sealing component is installed in the installation ring groove. The groove walls on both axial sides of the installation ring groove are respectively a first ring wall and a second ring wall. The first ring wall is located on the side of the second ring wall close to the first flow port, and the outer diameter of the first ring wall is smaller than the outer diameter of the second ring wall.

19. The pre-filter according to claim 1, characterized in that: The switching member is axially movable and inserted into the filter assembly, and the movable member is fixedly connected to the switching member.

20. The pre-filter according to claim 19, characterized in that The reversing member includes a switching section and a hollow pipe section connected in sequence along the axial direction, the switching section includes a connecting portion and a blocking portion, the hollow pipe section is inserted in the filter assembly, the peripheral wall of the hollow pipe section is provided with a connecting hole, the flushing flow path between the connecting hole and the water inlet is connected through the connecting portion and cut off by the blocking portion, and the movable member is fixedly connected to the hollow pipe section.

21. The pre-filter according to claim 19, characterized in that: The reversing member and the movable member are fixedly connected by threaded connection.

22. A water system, characterized in that: The pre-filter comprises the pre-filter according to any one of claims 1 to 21.

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