Pre-filter and water system

Abstract

The utility model discloses a pre-filter and a water consumption system, and relates to the technical field of filters. Wherein the pre-filter comprises a shell, a filtering assembly and a movable part, 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, the movable part is movably arranged in the water filtering cavity, so that the pre-filter has a filtering mode and a flushing mode, and the water inlet, the water outlet and the filtering assembly are arranged on one side of the movable part. And the drain outlet is formed in the other side of the movable part. The movable part is provided with a second overflowing opening, in the flushing mode, the two ends of the second overflowing opening are communicated with the spaces on the two sides of the movable part respectively, and in the filtering mode, the second overflowing opening is blocked, so that the spaces on the two sides of the movable part are separated. According to the technical scheme provided by the utility model, the filtering effect of the filtering assembly is ensured, and the service life of the pre-filter is prolonged.

Description

Technical Field

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

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

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

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

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

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

[0007] A movable member is movably provided in the water filter chamber, so that the pre-filter has a filtering mode and a flushing mode, the water inlet, the water outlet and the filter assembly are provided on one side of the movable member, and the sewage outlet is provided on the other side of the movable member;

[0008] The movable part is provided with a second flow opening. In the flushing mode, both ends of the second flow opening are respectively connected to the spaces on both sides of the movable part. In the filtering mode, the second flow opening is blocked, so that the spaces on both sides of the movable part are separated.

[0009] In one embodiment, the movable part includes a sealing portion, the water inlet and the sewage outlet are respectively arranged on both axial sides of the sealing portion, the second flow outlet is arranged in the sealing portion, a first flow outlet is provided between the water inlet and the sewage outlet, the axial side surface of the sealing portion can be detachably sealed to the first flow outlet, and the second flow outlet and the first flow outlet are staggered.

[0010] In one embodiment, a sealing ring surface is provided in the water filter cavity corresponding to the sealing portion, the axial direction of the sealing ring surface is parallel to the penetration direction of the first flow port, the outer peripheral seal of the sealing portion is fitted with the sealing ring surface, and can move axially relative to the sealing ring surface.

[0011] In one embodiment, the pre-filter also includes a reversing bottom shell, which is fixedly installed in the water filter chamber. The inner circumferential surface of the reversing bottom shell is the sealing annular surface. The sealing portion extends into the inner side of the reversing bottom shell and is slidably connected to the reversing bottom shell.

[0012] In one embodiment, the pre-filter further includes an exoskeleton and an impeller assembly disposed in the water filter chamber, the exoskeleton being rotatably mounted outside the filter assembly, and the sealing portion and the exoskeleton being respectively located on both axial sides of the impeller assembly.

[0013] In one embodiment, the pre-filter also includes an exoskeleton and an impeller assembly arranged in the water filter chamber, the exoskeleton can be rotatably mounted outside the filter assembly, the impeller assembly includes an impeller body and a mounting seat, the mounting seat is fixedly installed in the water filter chamber, the impeller body can be rotatably installed in the mounting seat, and is fixedly connected to the exoskeleton in the circumferential direction, the mounting seat is provided with a connected water inlet and drain port, and at least one of the drain port and the water inlet is the first flow port.

[0014] In one embodiment, a penetration direction of the first overflow opening is parallel to a penetration direction of the sewage outlet.

[0015] In one embodiment, a sealing member is sleeved on the outer periphery of the blocking portion, and the inner periphery and outer periphery of the sealing member abut against the blocking portion and the sealing annular surface respectively.

[0016] In one embodiment, an annular deformation gap is formed on a side of the sealing member facing the first flow opening.

[0017] In one embodiment, a sealing skirt is provided on the outer periphery of the sealing member, and the sealing skirt abuts against the sealing annular surface.

[0018] 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.

[0019] In one embodiment, 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 opening, and the outer diameter of the first ring wall is smaller than the outer diameter of the second ring wall.

[0020] In one embodiment, the ring width of the first ring wall is 60% to 80% of the ring width of the second ring wall.

[0021] In one embodiment, the ring width of the first ring wall is 2 mm to 2.5 mm.

[0022] In one embodiment, the outer diameter of the first annular wall is 30 mm to 32 mm.

[0023] In one embodiment, the outer diameter of the second annular wall is 32 mm to 34 mm.

[0024] In one embodiment, the width of the mounting ring groove is 3 mm to 3.5 mm.

[0025] In one embodiment, the thickness of the groove walls on both sides of the mounting ring groove in the axial direction is 0.3 mm to 0.5 mm.

[0026] In one embodiment, the pre-filter also includes a reversing member, which is hollow. The inner circumference of the reversing member is connected to the water outlet and the water filter chamber. 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 part and a blocking part. The hollow pipe section is inserted into the filter assembly. The flushing flow path between the water inlet and the reversing member is connected through the connecting part and cut off through the blocking part. The reversing member is transmission-connected to the movable part.

[0027] In one embodiment, the movable part includes a connecting part and a sealing part, a first flow opening is formed in the water filter cavity, the sealing part can detachably block the first flow opening, and the connecting part and the hollow pipe section are fixedly connected on the inner side of the filter assembly.

[0028] In one embodiment, the connecting portion and the hollow tube section are fixedly connected by threaded connection.

[0029] In one embodiment, the connecting portion is column-shaped, and the blocking portion is disc-shaped.

[0030] In one embodiment, the outer periphery of the blocking portion and / or the connecting portion is circular.

[0031] In one embodiment, the maximum diameter of the sealing portion is 30 mm to 35 mm.

[0032] In one embodiment, the maximum diameter of the connecting portion is 5 mm to 10 mm.

[0033] In one embodiment, the movable part also includes a connecting portion, which is fixedly connected to one axial side of the sealing portion and is arranged corresponding to the center of the sealing portion. The second flow opening penetrates the sealing portion axially, and a partial area of ​​the second flow opening is axially opposite to a portion of the connecting portion.

[0034] In one embodiment, the second flow opening is disposed near the center of the blocking portion.

[0035] In one embodiment, a plurality of the second flow openings are provided, and the plurality of the second flow openings are spaced apart and distributed around the center of the blocking portion.

[0036] In one embodiment, the movable member is arranged to be axially movable relative to the housing.

[0037] In one embodiment, the movable member is fixed to the filter assembly in a circumferential direction.

[0038] In one embodiment, a flat portion is provided on the outer periphery of the movable member, and the movable member is engaged with the filter assembly via the flat portion.

[0039] In one embodiment, the movable part includes a connecting part and a sealing part, a first flow port is formed in the water filter chamber, the sealing part can detachably block the first flow port, a portion of the connecting part extends into the filter assembly, and the movable part is fixed to the filter assembly through the connecting part.

[0040] In one embodiment, the movable member is provided with a first limiting step, and when the movable member moves toward the filter assembly, the first limiting step abuts against the end surface of the filter assembly.

[0041] In one embodiment, a second limiting step is provided on the end surface of the filter assembly corresponding to the first limiting step, and the second limiting step can be engaged with the first limiting step.

[0042] In one embodiment, the movable part includes a connecting part and a sealing part, a first flow opening is formed in the water filter chamber, the sealing part can detachably block the first flow opening, a portion of the connecting part extends into the filter assembly, and the first limiting step is provided on the connecting part.

[0043] The utility model also provides a water use system, comprising the aforementioned pre-filter.

[0044] In the technical solution of the present invention, the movable part moves within the water filter chamber, causing the second flow port to switch between a blocked state and a connected state, thereby switching the pre-filter between a filtration mode and a flushing mode. In the filtration mode, the water outlet is open and the sewage outlet is closed. After entering the water filter chamber, the raw water entering from the water inlet is filtered by the filter assembly and flows to the water outlet. At this time, the movable part is in a position that separates the space on both sides. In the flushing mode, the water outlet is closed and the sewage outlet is open. The water flow entering from the water inlet can flush the filter assembly within the water filter chamber. In this mode, impurities attached to the filter assembly can be cleaned, and then sewage can flow out through the sewage outlet. At this time, the movable part is in a position that connects the space on both sides, allowing the water inlet and the sewage outlet to be connected. Therefore, in the technical solution of the present invention, the pre-filter has a flushing mode, and can regularly clean impurities attached to the filter assembly, thereby ensuring the filtration effect of the filter assembly and improving the service life of the pre-filter. Moreover, the movable parts can switch between different positions accordingly, which can effectively ensure the working performance of the pre-filter in different working modes. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] 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.

[0046] Figure 1 A schematic diagram of the external structure of an embodiment of a pre-filter provided by the utility model;

[0047] Figure 2 This is a schematic cross-sectional view of an embodiment of the pre-filter provided by the present invention in filtering mode;

[0048] Figure 3 for Figure 2 A partial enlarged view of point A in the middle;

[0049] Figure 4 for Figure 2 A partial enlarged view of point B in the middle;

[0050] Figure 5 for Figure 2 A partial enlarged view of point C in the middle;

[0051] Figure 6 This is a schematic cross-sectional view of an embodiment of the pre-filter provided by the present invention in flushing mode;

[0052] Figure 7 for Figure 6 A partial enlarged view of point D in the middle;

[0053] Figure 8 for Figure 6 A partial enlarged view of point E in the middle;

[0054] Figure 9 A structural diagram of an embodiment of the present invention from a perspective of the movable part of the pre-filter;

[0055] Figure 10 for Figure 9 A schematic diagram of the structure of the moving parts from another perspective;

[0056] Figure 11 for Figure 9 A structural diagram of the movable parts from another perspective;

[0057] Figure 12 A structural schematic diagram of an embodiment of an impeller assembly of a pre-filter provided by the present invention from one side;

[0058] Figure 13 for Figure 12 A schematic diagram of the structure of the impeller assembly from another perspective;

[0059] Figure 14 This is a structural schematic diagram of an embodiment of a reversing member of a pre-filter provided by the present utility model.

[0060] Description of Figure Numbers:

[0061] 10. Filter bottle; 101. Water filter chamber; 102. Sewage outlet; 104. First flow outlet;

[0062] 20. Valve head; 201. Water inlet; 202. Water outlet; 22. Metal shell; 23. Plastic lining;

[0063] 30. Filter assembly; 31. Second limiting step;

[0064] 40. Impeller assembly; 402. Water inlet; 404. Discharge outlet; 410. Mounting base; 440. Impeller body;

[0065] 50. Exoskeleton;

[0066] 710, reversing bottom shell; 711, sealing ring surface;

[0067] 720, reversing member; 721, connecting portion; 722, blocking portion; 723, hollow tube section;

[0068] 730, movable part; 731, blocking portion; 7311, second flow port;

[0069] 732, connecting portion; 7321, flat position; 7322, first limiting step; 733, mounting ring groove; 7331, first ring wall; 7332, second ring wall;

[0070] 734, sealing element; 7341, deformation notch; 7342, sealing skirt;

[0071] 1001. Fasteners.

[0072] 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

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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 health. Therefore, a pre-filter is installed, which contains a filter assembly and other components to filter out large particles before the tap water is used. However, while the pre-filter is filtering the water, impurities 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.

[0077] The utility model proposes a pre-filter, the internal components of which can realize the switching of the internal flow channel, so that the internal filter group 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.

[0078] Water systems, such as whole-house water purification systems, typically feature a pre-filter to remove large particles from tap water. This not only ensures water safety but also extends the life of appliances, prevents clogged household water pipes, and improves residents' health. The pre-filter is the first coarse filtration device in a whole-house water purification system and is a physical filtration device used to protect back-end water safety.

[0079] See also Figure 1 、 Figure 2 and Figure 6 In one embodiment of the present invention, the pre-filter includes a shell having 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 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, 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 well water, and the water use end can be a faucet, a shower, or a drinking water outlet. This application does not make specific limitations on this.

[0080] The valve head 20 and the filter bottle 10 can be connected by a threaded connection. For example, the valve head 20 may be provided with an externally threaded tube, and the mouth of the filter bottle 10 may be provided with corresponding internal threads for threading the externally threaded tube. To reduce the difficulty of pre-filter production and the requirements for assembly test results, as well as to reduce the material cost of the valve head 20, in this embodiment, the filter bottle 10 and the valve head 20 are connected by a fastener 1001.

[0081] The valve head 20 comprises a metal outer shell and a plastic inner lining, with the water inlet 201 and the water outlet 202 both formed in the plastic inner lining 23. This allows water flowing through the pre-filter to directly contact the plastic inner lining rather than the metal outer shell, preventing water contamination by metal elements precipitated from the metal outer shell while also enhancing the pre-filter's aesthetics and housing strength.

[0082] The materials of the metal shell and the plastic lining are not specifically limited in this application. For example, the material of the metal shell can be a copper alloy, such as brass, and the material of the plastic lining can be PP (polypropylene) or PVC (polyvinyl chloride).

[0083] The pre-filter also includes a filter assembly 30 disposed within the water filter chamber 101. After raw water (e.g., tap water or well water) flows from an external water source into the water inlet 201, it can flow through the filter assembly 30 for filtration. The filter assembly 30 can intercept large particles of impurities in the water and remove some precipitated impurities, rust, sand, mud, bacteria, and other particulate impurities generated in the pipeline. This provides better protection for water purifiers, washing machines, showers, high-end faucets, downstream pipelines, etc., reducing the risk of damage to these devices due to impurity blockage. The form and structure of the filter assembly 30 are not limited. The filter assembly 30 can be equipped with a stainless steel filter mesh or a PP cotton filter mesh to filter impurities.

[0084] The pre-filter is usually a "T"-shaped structure. The "horizontal" position on the top corresponds to the valve head 20, and the left and right ends are respectively the water inlet 201 and the water outlet 202. The "vertical" main body below is the filter bottle 10, which is used to install the filter assembly 30. The lower end of the filter bottle 10 (the end away from the water inlet 201) usually has a sewage outlet 102. The sewage outlet 102 corresponds to different working modes of the pre-filter and can be switched between open and closed.

[0085] In one embodiment of the present invention, please refer to Figure 2 、 Figure 3 、 Figures 6 to 8 The pre-filter further includes a movable member 730, which is movably disposed in the water filter chamber 101, thereby enabling the pre-filter to have a filtering mode and a flushing mode. The water inlet 201, the water outlet 202, and the filter assembly 30 are disposed on one side of the movable member 730, and the sewage outlet 102 is disposed on the other side of the movable member 730. The movable member 730 is provided with a second flow port 7311. In the flushing mode, the two ends of the second flow port 7311 are respectively connected to the space on both sides of the movable member 730. In the filtering mode, the second flow port 7311 is blocked, thereby isolating the space on both sides of the movable member 730.

[0086] In the technical solution of the present utility model, the movable member 730 moves in the water filter chamber 101, so that the second flow port 7311 switches between the blocking state and the connecting state, thereby switching the pre-filter between the filtering mode and the flushing mode.

[0087] 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 connect the space on both sides, so that the water inlet 201 and the sewage outlet 102 can be connected.

[0088] When the pre-filter is in filtering mode, the water inlet 201 , the water outlet 202 and the filter 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 filter assembly 30 more efficiently.

[0089] Without loss of generality, when the pre-filter switches from filtering mode to flushing mode, that is, when the water outlet 202 is closed and the sewage outlet 102 is opened, a pressure difference is generated in the space on both sides of the movable member 730. This pressure difference causes the movable member 730 to move, thereby moving to a position where the space on both sides of the movable member 730 is connected, thereby connecting the flushing flow path between the water inlet 201 and the sewage outlet 102. Of course, in other embodiments, the position of the movable member 730 can be changed by other driving methods, for example, by manually turning a screw to drive the movable member 730 to move.

[0090] In the present invention, the pre-filter has a flushing mode that regularly cleans impurities adhering to the filter assembly 30, thereby ensuring the filtration efficiency of the filter assembly 30 and extending the service life of the pre-filter. Furthermore, the movable member 730 switches between different positions, effectively ensuring the performance of the pre-filter in different operating modes.

[0091] In one embodiment, please refer to Figure 2 、 Figure 3 、 Figures 6 to 8The movable part 730 includes a blocking portion 731, the water inlet 201 and the sewage outlet 102 are respectively arranged on both sides of the axial direction of the blocking portion 731, the second flow port 7311 is arranged on the blocking portion 731, and a first flow port 104 is provided between the water inlet 201 and the sewage outlet 102, the axial side surface of the blocking portion 731 can be detachably blocked from the first flow port 104, and the second flow port 7311 and the first flow port 104 are staggered.

[0092] It can be understood that the axial direction of the sealing portion 731 is also the direction perpendicular or approximately perpendicular to its circumferential plane. The water inlet 201, the water outlet 202 and the filter assembly 30 are arranged on the same axial side of the sealing portion 731, and the sewage outlet 102 is located on the other axial side of the sealing portion 731. In the filtering mode, the space on both sides of the movable part 730 is mainly separated by the sealing portion 731, that is, two unconnected spaces are formed on both sides of the axial direction of the sealing portion 731.

[0093] When the axial side surface of the blocking portion 731 blocks the first flow port 104 through the solid structure surrounding the second flow port 7311, the solid structure surrounding the first flow port 104 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, allowing the water inlet 201 to be connected to the sewage outlet 102 through the first flow port 104 and the second flow port 7311. Of course, in other embodiments, the axial side surface of the blocking portion 731 can also be detachably blocked from the sewage outlet 102.

[0094] Specifically, 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. In this way, 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, it can separate the water inlet 201 and the sewage outlet 102. 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 and radial directions, 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 quickly.

[0095] Furthermore, in this embodiment, please refer to Figure 2 、 Figure 3 、 Figure 6 and Figure 7 A sealing annular surface 711 is provided within the water filtration chamber 101, corresponding to the sealing portion 731. The axial direction of the sealing annular surface 711 is parallel to the direction through which the first flow opening 104 extends. The outer periphery of the sealing portion 731 is sealed against the sealing annular surface 711 and is axially movable relative to the sealing annular surface 711. That is, during the movement of the movable member 730, the outer periphery of the sealing portion 731 maintains a sealed engagement with the sealing annular surface 711. In filtration mode, this helps to ensure the axial separation of the space on either side of the sealing portion 731, preventing water from seeping from the side where the water inlet 201 is located toward the side where the sewage outlet 102 is located, thereby affecting the filtration process of the pre-filter. Furthermore, the sealing annular surface 711 provides guidance for the movement of the sealing portion 731, ensuring smooth switching between different positions. Of course, in other embodiments, the outer periphery of the sealing portion 731 may also be spaced apart from the surrounding ring structure.

[0096] Furthermore, in this embodiment, please refer to Figure 2 、 Figure 3 、 Figure 6 and Figure 7 The pre-filter also includes a reversing bottom housing 710, which is fixedly mounted within the water filtration chamber 101. The inner circumference of the reversing bottom housing 710 forms the sealing annular surface 711. The blocking portion 731 extends into the inner side of the reversing bottom housing 710 and is slidably connected thereto. It is understood that openings are provided on both axial sides of the reversing bottom housing 710 to prevent interference with the fit between the blocking portion 731 and the mounting seat 410, or the connection between the second flow opening 7311 and the sewage outlet 102. In this embodiment, a sealing fit is achieved between the inner circumference of the reversing bottom housing 710 and the outer circumference of the blocking portion 731. The inner circumference of the reversing bottom housing 710 also provides guidance for the movement of the blocking portion 731, ensuring smooth switching between different positions. Of course, in other embodiments, the sealing annular surface 711 can also be formed by the filter bottle 10.

[0097] In one embodiment, see Figure 2 and Figure 6 The pre-filter further includes an exoskeleton 50 disposed within the water filter chamber 101. The exoskeleton 50 is rotatably mounted on the outside of the filter assembly 30. In filtering mode, the exoskeleton 50 rotates to disrupt the water flow within the water filter chamber 101, preventing impurities from accumulating on the filter assembly 30, the exoskeleton 50, and the sidewalls of the water filter chamber 101. This reduces the possibility of clogging of the filter assembly 30, thereby ensuring the filtering effect of the filter assembly 30.

[0098] In one embodiment, please refer to Figure 2 、 Figure 3 、 Figure 6 、 Figure 7 、 Figure 12 and Figure 13 The pre-filter also includes an impeller assembly 40, which includes an impeller body 440 and a mounting seat 410. The mounting seat 410 is fixedly installed in the water filter chamber 101. The impeller body 440 can be rotatably installed in the mounting seat 410 and is fixedly connected to the exoskeleton 50 in the circumferential direction. The mounting seat 410 is provided with a water inlet 402 and a drain outlet 404 that are connected to each other. In the flushing mode, the water inlet 402 is connected to the water inlet 201, and the drain outlet 404 is connected to the sewage outlet 102. In this way, when flushing the filter assembly, water can enter the mounting seat 410 through the water inlet 402, driving the impeller body 440 to rotate. Since the exoskeleton 50 and the impeller body 440 are fixedly connected in the circumferential direction, it can provide power for the rotation of the exoskeleton 50, thereby further improving the degree of rotation of the exoskeleton 50.

[0099] Furthermore, in this embodiment, at least one of the drain port 404 and the water inlet 402 serves as the first flow opening 104. The blocking portion 731 may be located inside the mounting seat 410. In this case, in flushing mode, water flowing from the water inlet 402 into the mounting seat 410 will first pass through the second flow opening 7311 on the blocking portion 731 before flowing out of the mounting seat 410 through the drain port 404. The mounting seat 410 may also be located outside the mounting seat 410. In this case, the second flow opening 7311 may be located upstream of the water inlet 402 or downstream of the drain port 404. Furthermore, the blocking portion 731 may be provided corresponding to one of the water inlet 402 and the drain outlet 404 to detachably block one of the water inlet 402 and the drain outlet 404, or may be capable of simultaneously blocking the water inlet 402 and the drain outlet 404 and moving relative to the mounting base 410 to a position simultaneously opening the water inlet 402 and the drain outlet 404. Of course, in other embodiments, the reversing bottom shell 710 may also be configured to form the first flow opening 104 that cooperates with the blocking portion 731.

[0100] Furthermore, in this embodiment, please refer to Figure 2 、 Figure 3 、 Figure 6 and Figure 7, the blocking portion 731 and the exoskeleton 50 are respectively located on both axial sides of the impeller assembly 40, and the drain port 404 is provided on the opposite side of the mounting seat 410 and the blocking portion 731. The blocking portion 731 can be detachably abutted against the side of the mounting seat 410 away from the exoskeleton 50, and can detachably block the drain port 404. That is, the drain port 404 serves as the first flow port 104. In this way, 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 provided inside the mounting seat 410, and the sealing ring surface 711 corresponds to the inner circumferential surface of the mounting seat 410.

[0101] Among them, the reversing bottom shell 710 will also be located on the side of the impeller assembly 40 away from the outer frame 50. 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 sealing part 731 and ensuring the sealing fit with the sealing part 731.

[0102] In one embodiment, the penetration direction of the first flow port 104 is parallel to the penetration direction of the sewage outlet 102. 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 exerted 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 axial 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.

[0103] 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 set, and a through hole eccentric to the rotation axis is set 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.

[0104] In one embodiment, please refer to Figure 2 、 Figure 3 、 Figure 6 and Figure 7 The outer periphery of the blocking portion 731 is provided with a sealing member 734, and the inner periphery and outer periphery of the sealing member 734 abut against the blocking portion 731 and the sealing annular surface 711, respectively. In this way, the blocking portion 731 can achieve a sealed fit with the sealing annular surface 711 on the outer periphery through the sealing member 734. 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 fit should not be too large 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 sealing annular surface 711 is sealed by the elastic deformation portion.

[0105] Furthermore, in this embodiment, please refer to Figure 2 、 Figure 3 、 Figure 6 and Figure 7 The sealing member 734 has an annular deformation notch 7341 on the side facing the first flow opening 104. This improves the deformation capability of the sealing member 734. When the blocking portion 731 moves relative to the sealing annular surface 711, the sealing member 734 deforms more easily, reducing the resistance to the blocking portion 731 and ensuring smooth movement of the blocking portion 731.

[0106] Furthermore, in this embodiment, please refer to Figure 2 、 Figure 3 、 Figure 6 and Figure 7 The outer periphery of the sealing member 734 is provided with a sealing skirt 7342, which abuts the sealing annular surface 711. In this manner, the sealing skirt 7342 can effectively fill the gap between the sealing portion 731 and the sealing annular surface 711. Furthermore, when the sealing portion 731 moves relative to the sealing annular surface 711, the easily deformable nature of the sealing skirt 7342 can reduce resistance to the sealing portion 731, thereby ensuring smooth movement of the sealing portion 731. Without loss of generality, the base portion of the sealing member 734 and the sealing skirt 7342 are jointly constructed to form a deformation notch. Specifically, the base portion is L-shaped, and the sealing skirt 7342 is connected to one end of the base portion.

[0107] In one embodiment, please refer to Figure 2 、 Figure 3 、 Figure 6 and Figure 7The 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 mounted on the outer circumference of the blocking portion 731. When the blocking portion 731 moves relative to the sealing ring surface 711, the sealing member 734 is not likely to move on the blocking portion 731 and can be stably mounted 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 mounting the sealing member 734. Instead, the sealing member 734 can be connected to the blocking portion 731 by an interlocking manner. In this way, a stable connection between the sealing member 734 and the blocking portion 731 can also be ensured.

[0108] Furthermore, in this embodiment, please refer to Figure 2 、 Figure 3 、 Figure 6 、 Figure 7 、 Figures 9 to 11 The 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 closer to the first flow outlet 104. 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 on which the first annular wall 7331 is located is also closer to the water inlet 201, and the side on which the second annular wall 7332 is located is also closer to the sewage outlet 102. When both the water inlet 201 and the sewage outlet 102 are open, the pressure on the side where the first annular wall 7331 is located is higher. The smaller outer diameter of the first annular wall 7331 allows the groove wall of the mounting ring groove 733 to be lower on this side, allowing the seal 734 to undergo more compression deformation and better adapt to pressure changes on the high-pressure side. The larger outer diameter of the second annular wall 7332 allows the groove wall of the mounting ring groove 733 to be higher on this side. The second annular wall 7332 provides additional support, effectively preventing the seal 734 from being squeezed out of the groove under high pressure. Furthermore, the seal 734 is installed into the mounting ring groove 733 from the side of the first annular wall 7331, which can reduce resistance during installation, avoid damage to the seal 734, simplify the installation process of the seal 734, and make it easier to place the seal 734 in place.

[0109] Further, in this embodiment, please refer to Figure 11The width D1 of the first annular wall 7331 is 60% to 80% of the width D2 of the second annular wall 7332. The widths of the two annular walls, i.e., their radial widths, are such that the ratio of the widths of the first annular wall 7331 to the second annular wall 7332 (i.e., D1 / D2) is greater than or equal to 60% and less than or equal to 80%. Within this range, this width ratio can effectively meet the functional requirements of the groove walls on both sides of the mounting groove 733. The width D1 of the first annular wall 7331 is preferably 2 mm to 2.5 mm, while the width D2 of the second annular wall 7332 is preferably 3 mm to 3.5 mm. Specifically, the width D1 of the first annular wall 7331 is greater than or equal to 2 mm and less than or equal to 2.5 mm, while the width D2 of the second annular wall 7332 is greater than or equal to 3 mm and less than or equal to 3.5 mm. When the ring width D1 of the first ring wall 7331 is within this range, the seal 734 can be easily installed while providing sufficient space for the seal 734 to deform. When the ring width D2 of the second ring wall 7332 is within this range, the seal 734 can be provided with sufficient support while preventing the seal 734 from falling out. Of course, in other embodiments, the above-mentioned ring width ratio can also be adaptively adjusted to a range of less than 60% or greater than 80%, and the ring widths of the first ring wall 7331 and the second ring wall 7332 can also be adaptively adjusted to other ranges, as long as the installation requirements of the seal 734 are met.

[0110] In this example, see Figure 11 The outer diameter D3 of the first annular wall 7331 is between 30 mm and 32 mm, and the outer diameter D4 of the second annular wall 7332 is between 32 mm and 34 mm. That is, the outer diameter D3 of the first annular wall 7331 is greater than or equal to 30 mm and less than or equal to 32 mm, and the outer diameter D4 of the second annular wall 7332 is greater than or equal to 32 mm and less than or equal to 34 mm. In this way, the structural dimensions of the blocking portion 731 can meet the required sealing effect on the first flow opening 104 and also provide a sufficient pressure-bearing area. Under the pressure differential between the two sides, the blocking portion 731 can be subjected to sufficient pressure. Of course, in other embodiments, the outer diameter D3 of the first annular wall 7331 can also be less than 30 mm or greater than 32 mm, and the outer diameter D4 of the second annular wall 7332 can also be less than 32 mm or greater than 34 mm. It is sufficient that the area of ​​the blocking portion 731 meets the driving pressure required for its movement under the pressure differential between the water inlet 201 and the sewage outlet 102.

[0111] Further, in this embodiment, please refer to Figure 11The groove width D5 of the mounting ring groove 733 is 3 mm to 3.5 mm. The groove width D5 of the mounting ring groove 733 is greater than or equal to 3 mm and less than or equal to 3.5 mm. This allows for a seal 734 of sufficient size to be accommodated, ensuring a seal between the sealing portion 731 and the sealing surface 711. Of course, in other embodiments, the groove width D5 of the mounting ring groove 733 can also be adjusted to be less than 3 mm or greater than 3.5 mm, depending on the desired seal 734.

[0112] Further, in this embodiment, please refer to Figure 11 The thickness of the groove walls D6 on both axial sides of the mounting annular groove 733 is between 0.3 mm and 0.5 mm. That is, the axial width D6 of the first annular wall 7331 and the second annular wall 7332 is greater than or equal to 0.3 mm and less than or equal to 0.5 mm. This ensures the structural strength of the first annular wall 7331 and the second annular wall 7332, thereby ensuring stable installation and support for the seal 734. Of course, in other embodiments, the thickness D6 of the first annular wall 7331 and the second annular wall 7332 can also be adaptively adjusted to a value less than 0.3 mm or greater than 0.5 mm, depending on the actual application scenario.

[0113] In one embodiment, see Figure 9 and Figure 10 The second flow opening 7311 is disposed near the center of the blocking portion 731. Thus, when the sewage outlet 102 is disposed at the center of the water filter chamber 101, the second flow opening 7311 in this embodiment is disposed so that the second flow opening 7311 and the sewage outlet 102 are substantially opposite to each other in the axial direction, thereby facilitating smoother water flow from the second flow opening 7311 to the sewage outlet 102.

[0114] Further, in this embodiment, please refer to Figure 9 and Figure 10The movable member 730 further includes a connecting portion 732, which is connected to one axial side of the blocking portion 731. The connecting portion 732 is disposed corresponding to the center of the blocking portion 731. The second flow opening 7311 axially penetrates the blocking portion 731, and a portion of the second flow opening 7311 axially opposes a portion of the connecting portion 732. In other words, the second flow opening 7311 axially penetrates a region near the center of the blocking portion 731, and the connecting portion 732 is connected to the center of the blocking portion 731. The second flow opening 7311 and the connecting portion 732 have axially overlapping portions, and each also has non-overlapping portions. Thus, by arranging the connection portion 732 and a portion of the second flow opening 7311 relative to each other, the structural strength of the blocking portion 731 at the second flow opening 7311 can be increased, thereby enhancing the second flow opening 7311's ability to withstand the impact of water flow. Furthermore, the connection portion 732 only partially opposes the second flow opening 7311, which helps to ensure the structural strength of the connection between the connection portion 732 and the blocking portion 731. Furthermore, this also helps to increase the flow area of ​​the second flow opening 7311, thereby increasing the flow capacity of the second flow opening 7311 and ensuring smooth discharge of sewage. Of course, in other embodiments, the flow opening can also be arranged corresponding to the peripheral area of ​​the connection portion 732.

[0115] In one embodiment, see Figure 9 and Figure 10 , there are multiple second flow openings 7311, and multiple second flow openings 7311 are distributed at intervals around the center of the blocking portion 731. Among them, multiple refers to more than two. The blocking portion 731 is provided with multiple second flow openings 7311, which can effectively increase the range of the flow area. The multiple second flow openings 7311 are 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 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 there is no need to open a second flow opening 7311 with a large area on the blocking portion 731, which is conducive to ensuring the structural strength of the blocking portion 731. Furthermore, the multiple second flow openings 7311 can be evenly distributed 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 either side of the center of the blocking portion 731 in the same radial direction of the blocking portion 731. Of course, in other embodiments, a grid-like flow area may be provided on the blocking portion 731 to form the second flow openings 7311.

[0116] In one embodiment, please refer to Figure 2 、 Figure 4 、 Figure 6 、 Figure 8 and Figure 14 The pre-filter also includes a reversing member 720, which is hollow. The inner circumference of the reversing member 720 is connected to the water outlet 202 and the water filter chamber 101. The reversing member 720 includes a switching section and a hollow pipe section 723 connected in sequence along the axial direction. The switching section includes a connecting portion 721 and a blocking portion 722. The hollow pipe section 723 is inserted into the filter assembly 30. The flushing flow path between the water inlet 201 and the reversing member 720 is connected through the connecting portion 721 and is cut off through the blocking portion 722. The reversing member 720 is transmission-connected to the movable member 730.

[0117] It is understood that the pre-filter is of a backwash type. Corresponding to the filtering mode and the flushing mode, the internal flow path of the pre-filter will change, forming a filtering flow path and a flushing flow path, respectively. Since the reversing member 720 and the movable member 730 are connected by transmission, the movable member 730 and the reversing member 720 can be linked. While the flow path between the water inlet 201 and the filter assembly 30 is switched by the reversing member 720, the connection relationship between the sewage outlet 102 and the water inlet 201 can also be changed by the movable member 730. Of course, in other embodiments, the reversing member 720 and the movable member 730 can also be driven by different drive sources without a transmission connection, and cooperate with each other to form a flushing flow path and a filtering flow path.

[0118] Specifically, the connection between the inner circumference of the reversing member 720 and the water filter chamber 101 is reflected in that the inner circumference of the reversing member 720 is connected to the inner circumference of the filter assembly 30 through the through-holes set in the peripheral wall, and the connection between the inner circumference 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 of the end side.

[0119] Without loss of generality, the reversing member 720 and the movable member 730 are axially movable relative to the housing. The connecting portion 721 and the blocking portion 722 are also axially distributed on the reversing member 720. The connecting portion 721 is disposed near one end of the reversing member 720, and the port on this end is connected to the water outlet 202. The reversing member 720 is further provided with a connecting structure on the other axial side of the blocking portion 722, and is connected to the water filter chamber 101 through this connecting structure. Of course, in other embodiments, the reversing member 720 may also be rotatably disposed relative to the housing.

[0120] In filter mode, see Figure 4, 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 outer 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 flows to the inner peripheral side of the reversing member 720 through the above-mentioned connecting structure of the reversing member 720, and flows along the axial direction of the reversing member 720 to the side where the connecting portion 721 is located, and finally flows to the water outlet 202.

[0121] In flush mode, see Figure 8 , the water outlet 202 is closed and the sewage outlet 102 is opened. The water flow from the water inlet 201 will first flow through the connecting portion 721 to the inner peripheral side of the reversing member 720, and flow to the filter assembly 30 through the connecting structure provided in the reversing member 720. Specifically, it will be sprayed to the filter assembly 30 through the through hole provided in the hollow pipe section 723. 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.

[0122] 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, thereby cleaning the filter assembly 30 from the inside out. However, this raw water may contain impurities. If not filtered, these impurities may be trapped within the inner circumference of the filter assembly 30 during the flushing process. When the pre-filter chamber 101 switches from flushing mode to filtering mode, these impurities flow out of the water outlet 202 along with the filtered raw water, resulting in a poor initial filtration effect. Therefore, a filtering structure is also provided around the circumference of the connecting portion 721. This filtering structure is often configured as a filter screen, which can be secured to the inside or outside of the porous structure by bonding, or integrally formed with the connecting portion 721.

[0123] Without loss of generality, an elastic member is connected to at least one of the reversing member 720 and the movable member 730. Under the action of the elastic member, both 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 filtering mode to 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. The side of the blocking portion 731 close to the water inlet 201 will be subjected to pressure, causing the blocking portion 731 to move 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. 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 and 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.

[0124] 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. The user can switch the pre-filter to different modes by twisting the screw in different directions.

[0125] In one embodiment, please refer to Figure 2 and Figure 5 The connecting portion 732 and the hollow tube section 723 are fixedly connected on the inner side of the filter assembly 30. Thus, the fixed connection between the connecting portion 732 and the hollow tube section 723 allows the reversing member 720 and the movable member 730 to move in conjunction, thereby achieving a transmission connection between the reversing member 720 and the movable member 730. Specifically, through-holes are provided on both axial side surfaces of the mounting seat 410. The connecting portion 732 penetrates the through-holes of the impeller body 440 from the side of the mounting seat 410 away from the filter assembly 30, and exits from the side of the mounting seat 410 close to the filter assembly 30, then passes through the exoskeleton 50, extends into the filter assembly 30, and connects to the reversing member 720. Of course, in other embodiments, the connecting portion 732 and the hollow tube section 723 may be movably inserted into each other, or the two may be arranged relative to each other at intervals, and the transmission between the two is carried out through an elastic member, and one end of the elastic member is sleeved and abutted against the connecting portion 732, and the other end is sleeved and abutted against the hollow tube section 723.

[0126] For more details, please refer to Figure 2 and Figure 5, the connecting portion 732 and the hollow pipe section 723 are fixedly connected by a threaded connection. That is, the reversing member 720 and the movable member 730 are separately formed and then fixedly connected by a threaded connection. It can be understood that after the reversing 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 reversing member 720 and the movable member 730 are assembled, the two are respectively inserted from the two ports of the filter assembly 30. The structures at the opposite ends of the reversing 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 into place. Of course, in other embodiments, the connecting portion 732 and the hollow pipe section 723 can also be fixed by screw locking, bonding or welding.

[0127] In one embodiment, see Figures 9 to 11 , the connecting portion 732 is columnar, and the blocking portion 731 is disc-shaped. In this way, the blocking portion 731 and the connecting portion 732 can be conveniently matched with the corresponding structures respectively. Furthermore, the outer peripheral contours of the blocking portion 731 and the connecting portion 732 are circular. In this way, the movable part 730 has good symmetry in the circumferential direction. When assembling the movable part 730, there is no need to distinguish the installation position in the circumferential direction. The corresponding parts of the movable part 730 can be matched with the corresponding movable parts, for example, the blocking portion 731 and the sealing ring surface 711, and the connecting portion 732 and the impeller shaft, the mounting seat 410 and the outer skeleton 50 and other components.

[0128] Among them, see Figure 11 The maximum diameter D4 of the blocking portion 731 is preferably between 30 mm and 35 mm, and the maximum diameter D7 of the connecting portion 732 is preferably between 5 mm and 10 mm. That is, the maximum diameter D4 of the blocking portion 731 is greater than or equal to 30 mm and less than or equal to 35 mm, and the maximum diameter D7 of the connecting portion 732 is greater than or equal to 5 mm and less than or equal to 10 mm. Of course, in other embodiments, the maximum diameter D4 of the blocking portion 731 can also be adjusted to a range of less than 30 mm or greater than 35 mm, and the maximum diameter D7 of the connecting portion 732 can also be adjusted to a range of less than 5 mm or greater than 10 mm, as required.

[0129] In one embodiment, the movable member 730 is circumferentially secured to the filter assembly 30. This allows the movable member 730 to move axially relative to the filter assembly 30 while remaining circumferentially fixed relative to the filter assembly 30. This allows the movable member 730 to more smoothly switch between the two positions corresponding to the filtering mode and the flushing mode, without causing any shaking. Of course, in other embodiments, the movable member 730 may also be circumferentially secured to the mounting base 410.

[0130] In one embodiment, see Figure 9 The movable member 730 is provided with a flat portion 7321 on its outer periphery, which engages with the filter assembly 30 via the flat portion 7321. Specifically, the filter assembly 30 is provided with a socket that fits with the flat portion 7321 on the movable member 730. It is understood that the socket is located on the axial side of the filter assembly 30 near the sewage outlet 102. The flat portion 7321 on the movable member 730 is adapted to be inserted into the socket, and the opposing side walls of the flat portion 7321 respectively engage with the opposing side walls of the socket to limit relative rotation between the movable member 730 and the filter assembly 30. It is understood that the flat portion 7321 and the filter assembly 30 are slidably engaged in the axial direction, providing a certain degree of guidance for the axial movement of the movable member 730, thereby ensuring the smooth operation of the pre-filter. Of course, in other embodiments, the movable member 730 and the filter assembly 30 can also be engaged through other structures, such as the engagement of a protrusion and a groove of other shapes.

[0131] Specifically, the movable member 730 is fixedly engaged with the filter assembly 30 via the connecting portion 732. That is, the flat portion 7321 is provided on the connecting portion 732, which is also provided with a threaded section. The flat portion 7321 is located between the threaded section and the connecting portion 732 and extends into the filter assembly 30. The flat portion 7321 and the filter assembly 30 are limited by the flat portion 7321 and are fixedly screwed to the reversing member 720. The threaded section may be provided with external threads on the outer periphery, or may be formed with a screw hole, and internal threads may be provided on the inner periphery of the screw hole. The threaded section, at least in the direction in which the flat portion 7321 is provided, does not exceed the width of the flat portion 7321, so that the threaded section can pass through the jack on the filter assembly 30.

[0132] In one embodiment, see Figure 5 and Figure 9The movable member 730 is provided with a first limiting step 7322. When the movable member 730 moves toward the filter assembly 30, the first limiting step 7322 abuts against the end surface of the filter assembly 30. In other words, the first limiting adjustment and the abutting engagement with the end surface of the filter assembly 30 provide a positioning function for the movable member 730 in one direction of movement, thereby ensuring the movement reliability of the movable member 730. Specifically, the first limiting step 7322 is formed on the side of the flat position 7321 close to the blocking portion 731, and the flat position 7321 on the connecting portion 732 has a certain extension in the axial direction. When the movable part 730 is in the position corresponding to the flushing mode, the flat position 7321 of the connecting portion 732 partially extends into the filter assembly 30 and partially exposed outside the filter assembly 30. The first limiting step 7322 is arranged outside the filter assembly 30 and spaced apart from the end face of the filter assembly 30. When the front filter switches to the filtering mode, the movable part 730 moves in the direction away from the sewage outlet 102, and the flat position 7321 of the connecting portion 732 continues to extend into the filter assembly 30 until the first limiting step 7322 abuts against the end face of the filter assembly 30, and the movable part 730 also moves to the position corresponding to the filtering mode. Of course, in other embodiments, a positioning abutment structure may not be provided between the movable part 730 and the filter assembly 30, and a positioning matching structure may be provided for the movable part 730 by other structures, such as the filter bottle 10 or the mounting seat 410.

[0133] Further, in this embodiment, please refer to Figure 5 The end surface of the filter assembly 30 is provided with a second limiting step 31 corresponding to the first limiting step 7322, and the second limiting step 31 can engage with the first limiting step 7322. That is, when the movable member 730 and the filter assembly 30 abut, the matching step surfaces engage, thereby improving the positioning and matching effect between the movable member 730 and the filter assembly 30, further ensuring the movement reliability of the movable member 730. Of course, in other embodiments, the end surface of the filter assembly 30 can also be provided with no step structure, and only the end surface of the planar structure can abut against the first limiting step 7322.

[0134] 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.

[0135] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A pre-filter, characterized in that: include: The shell has a water filter cavity and a water inlet, a water outlet and a sewage outlet connected to the water filter cavity; A filter assembly is arranged in the water filter cavity; as well as A movable member is movably provided in the water filter chamber, so that the pre-filter has a filtering mode and a flushing mode, the water inlet, the water outlet and the filter assembly are provided on one side of the movable member, and the sewage outlet is provided on the other side of the movable member; The movable part is provided with a second flow opening. In the flushing mode, both ends of the second flow opening are respectively connected to the spaces on both sides of the movable part. In the filtering mode, the second flow opening is blocked, so that the spaces on both sides of the movable part are separated.

2. The prefilter according to claim 1, wherein The movable part includes a blocking portion, the water inlet and the sewage outlet are respectively arranged on both axial sides of the blocking portion, the second flow outlet is arranged in the blocking portion, a first flow outlet is provided between the water inlet and the sewage outlet, the axial side surface of the blocking portion can be detachably blocked from the first flow outlet, and the second flow outlet and the first flow outlet are staggered.

3. The prefilter according to claim 2, wherein: A sealing ring surface is provided in the water filter cavity corresponding to the blocking portion, the axial direction of the sealing ring surface is parallel to the penetration direction of the first flow port, the outer peripheral seal of the blocking portion is fitted with the sealing ring surface and can move axially relative to the sealing ring surface.

4. The prefilter according to claim 3, characterized in that The pre-filter also includes a reversing bottom shell, which is fixedly installed in the water filter chamber. 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.

5. The pre-filter according to claim 4, characterized in that The pre-filter further comprises an exoskeleton and an impeller assembly arranged in the water filter chamber. The exoskeleton is rotatably sleeved outside the filter assembly. The blocking portion and the exoskeleton are respectively located on both axial sides of the impeller assembly.

6. The prefilter according to claim 2, wherein: The pre-filter also includes an exoskeleton and an impeller assembly arranged in the water filter chamber, the exoskeleton is rotatably mounted on the outside of the filter assembly, the impeller assembly includes a mounting seat fixedly installed in the water filter chamber and an impeller body rotatably installed in the mounting seat, the impeller body is fixedly connected to the exoskeleton in the circumferential direction, the mounting seat is provided with a connected water inlet and drain outlet, and at least one of the drain outlet and the water inlet is the first flow outlet.

7. The prefilter according to claim 2, wherein: The penetration direction of the first overflow port is parallel to the penetration direction of the sewage outlet.

8. The pre-filter according to claim 3, wherein: A sealing member is sleeved on the outer periphery of the blocking portion, and the inner periphery and outer periphery of the sealing member are respectively in contact with the blocking portion and the sealing annular surface.

9. The prefilter according to claim 8, characterized in that The sealing member is provided with an annular deformation notch on a side facing the first flow opening; And / or, a sealing skirt is provided on the outer periphery of the sealing element, and the sealing skirt abuts against the sealing ring surface.

10. The pre-filter according to claim 8, characterized in that An installation ring groove is provided on the outer periphery of the sealing portion, and the sealing member is installed in the installation ring groove.

11. The prefilter according to claim 10, wherein: The groove walls on both axial sides of the mounting ring groove are respectively the first ring wall and the second ring wall. The first ring wall is located on the side of the second ring wall close to the first flow opening. The outer diameter D3 of the first ring wall is smaller than the outer diameter D4 of the second ring wall.

12. The pre-filter according to claim 11, characterized in that The ring width D1 of the first ring wall is 60% to 80% of the ring width D2 of the second ring wall; And / or, the ring width of the first ring wall is 2 mm to 2.5 mm; and / or, the outer diameter D3 of the first annular wall is 30 mm to 32 mm; And / or, the outer diameter D4 of the second annular wall is 32 mm to 34 mm.

13. The pre-filter according to claim 10, wherein: The groove width D5 of the mounting ring groove is 3 mm to 3.5 mm; And / or, the thickness D6 of the groove walls on both sides of the mounting ring groove in the axial direction is 0.3 mm to 0.5 mm.

14. The pre-filter according to claim 1, wherein The pre-filter also includes a reversing member, which is hollow. The inner circumference of the reversing member is connected to the water outlet and the water filter chamber. 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 into the filter assembly. The flushing flow path between the water inlet and the reversing member is connected through the connecting portion and cut off through the blocking portion. The reversing member is transmission-connected to the movable member.

15. The pre-filter according to claim 14, characterized in that The movable part includes a connecting part and a blocking part. A first flow opening is formed in the water filter cavity. The blocking part can detachably block the first flow opening. The connecting part and the hollow pipe section are fixedly connected on the inner side of the filter assembly.

16. The pre-filter according to claim 15, characterized in that The connecting portion and the hollow pipe section are fixedly connected by threaded connection.

17. The pre-filter according to claim 15, wherein: The connecting portion is column-shaped, and the blocking portion is disc-shaped.

18. The pre-filter according to claim 17, wherein: The outer periphery of the blocking portion and / or the connecting portion is circular.

19. The pre-filter according to claim 18, wherein The maximum diameter of the blocking portion is 30 mm to 35 mm; And / or, the maximum diameter of the connecting portion is 5 mm to 10 mm.

20. The pre-filter according to claim 1, wherein The movable member includes a blocking portion and a connecting portion, the connecting portion being fixedly connected to one axial side of the blocking portion and arranged corresponding to the center of the blocking portion, the second flow opening axially penetrating the blocking portion, and a portion of the second flow opening axially opposing a portion of the connecting portion; And / or, the second flow opening is arranged near the center of the blocking portion; And / or, a plurality of second flow openings are provided, and the plurality of second flow openings are distributed at intervals around the center of the blocking portion.

21. The pre-filter according to claim 1, wherein The movable member is arranged to be axially movable relative to the housing.

22. The pre-filter according to claim 21, wherein The movable member is clamped and fixed to the filter assembly in the circumferential direction.

23. The pre-filter according to claim 22, wherein: The outer periphery of the movable part is provided with a flat portion, and is engaged with the filter assembly through the flat portion; And / or, the movable part includes a connecting part and a sealing part, a first flow port is formed in the water filter chamber, the sealing part can detachably block the first flow port, a part of the connecting part extends into the filter assembly, and the movable part is fixed to the filter assembly through the connecting part.

24. The pre-filter according to claim 1, wherein The movable member is provided with a first limiting step. When the movable member moves toward the filter assembly, the first limiting step stops at the end surface of the filter assembly.

25. The pre-filter according to claim 24, characterized in that A second limiting step is provided on the end surface of the filter assembly corresponding to the first limiting step, and the second limiting step can be engaged with the first limiting step; And / or, the movable part includes a connecting part and a sealing part, a first flow opening is formed in the water filter chamber, the sealing part can detachably block the first flow opening, part of the connecting part extends into the filter assembly, and the first limiting step is arranged on the connecting part.

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

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