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 outlet, the water inlet, the water outlet and the sewage draining outlet 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, the movable part is connected with an elastic part, and under the action of the elastic part, the pre-filter can be flushed. The movable part can be naturally maintained at a position corresponding to the filtering mode, the water inlet, the water outlet and the filtering assembly are arranged on one side of the movable part, and the sewage draining exit is arranged on the other side of the movable part. The movable part is provided with an overflowing opening, in the flushing mode, the two ends of the overflowing opening are communicated with the spaces on the two sides of the movable part respectively, and in the filtering mode, the overflowing opening is blocked, so that the spaces on the two sides of the movable part are separated. The technical scheme provided by the utility model 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 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 disposed in the water filter chamber, so that the pre-filter has a filtering mode and a flushing mode. The movable member is connected to an elastic member. Under the action of the elastic member, the movable member can naturally maintain a position corresponding to the filtering mode. The water inlet, the water outlet and the filter assembly are disposed on one side of the movable member, and the sewage outlet is disposed on the other side of the movable member.

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

[0009] In one embodiment, the elastic member is provided on a side of the movable member close to the sewage outlet.

[0010] In one embodiment, the movable member is arranged to be axially movable relative to the housing.

[0011] In one embodiment, a shielding portion is fixedly provided in the water filter chamber, the movable part includes a sealing portion and a connecting portion provided on the side of the sealing portion away from the sewage outlet, the water inlet and the sewage outlet are respectively provided on both axial sides of the sealing portion, the water outlet side of the flow port passes through the side of the sealing portion close to the sewage outlet, the water inlet side of the flow port extends axially to the connecting portion, and radially passes through the radial side of the connecting portion. In the filtering mode, the shielding portion blocks the water inlet side of the flow port.

[0012] In one embodiment, the connecting portion is axially movable so that the shielding portion can be detachably blocked on the water inlet side of the flow opening.

[0013] In one embodiment, the shielding portion is annular, and the water inlet side of the flow port is accommodated in the shielding portion in the filtering mode and is at least partially exposed to the outside in the flushing mode.

[0014] In one embodiment, the elastic member is provided on a side of the blocking portion close to the sewage outlet.

[0015] In one embodiment, a mounting protrusion is provided on one side of the blocking portion close to the sewage outlet, and the elastic member is sleeved on the mounting protrusion.

[0016] In one embodiment, the mounting protrusion and the connecting portion are coaxially arranged, and the water outlet side of the flow port passes through the mounting protrusion.

[0017] In one embodiment, a sealing annular surface is provided in the water filter cavity corresponding to the blocking portion, and the outer periphery of the blocking portion is sealedly fitted with the sealing annular surface and can move axially relative to the sealing annular surface.

[0018] In one embodiment, the pre-filter also includes a reversing bottom shell, which is fixedly installed in the water filter chamber. The reversing bottom shell is hollow, and the inner circumferential surface of the reversing bottom shell is the sealing ring surface. The sealing portion extends into the inner side of the reversing bottom shell and is slidably connected to the reversing bottom shell.

[0019] In one embodiment, the pre-filter further includes an exoskeleton, which is sleeved outside the filter assembly, and the exoskeleton includes a side frame and a chassis, and the chassis is provided with a discharge port connected to the water inlet, and the movable part includes a sealing portion, and the discharge port and the sewage outlet are respectively arranged on both axial sides of the sealing portion.

[0020] In one embodiment, a siphon flow channel is formed on the outer frame, the side frame is provided with a siphon hole connected to the siphon flow channel, and the discharge port includes a first discharge port connected to the siphon flow channel.

[0021] In one embodiment, the discharge port includes a second discharge port, and the second discharge port is arranged to penetrate the bottom plate in the axial direction.

[0022] In one embodiment, the outer frame is provided with an annular shielding portion, the water inlet side of the flow port is provided corresponding to the inner circumference of the shielding portion, and the discharge port is provided corresponding to the outer circumference of the shielding portion.

[0023] In one embodiment, the pre-filter further includes a reversing bottom shell, which is fixedly connected to a side of the chassis close to the sewage outlet, the blocking portion is slidably connected to the reversing bottom shell, and the discharge outlet is arranged corresponding to the inner circumference of the reversing bottom shell.

[0024] In one embodiment, the shell includes a sewage discharge component, the sewage outlet is formed in the sewage discharge component, the sewage discharge component includes a sewage discharge valve, the elastic member is located between the movable member and the sewage discharge valve, and the two ends of the elastic member are respectively in contact with the movable member and the sewage discharge component.

[0025] In one embodiment, the sewage discharge assembly includes a connecting member, the connecting member is installed at the sewage discharge port, the sewage discharge valve is connected to the connecting member, and the elastic member abuts against the connecting member.

[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 sealing portion and a connecting portion connected to one axial side of the sealing portion, the water inlet and the sewage outlet are respectively arranged on both axial sides of the sealing portion and are separated by the sealing portion in the filtering mode, and the connecting portion and the hollow pipe section are fixedly connected.

[0028] In one embodiment, the connecting portion and the hollow tube section are fixedly connected inside the filter assembly.

[0029] In one embodiment, the connecting portion and the hollow tube section are connected by threads.

[0030] The utility model also provides a water use system, comprising the aforementioned pre-filter.

[0031] In the technical solution of the present invention, the pre-filter has a flushing mode that can regularly clean impurities attached to the filter assembly, thereby ensuring the filtering effect of the filter assembly and increasing the service life of the pre-filter. Furthermore, the movable member switches between different positions, effectively ensuring the performance of the pre-filter in different operating modes. When the pre-filter switches from filtering mode to flushing mode, the movable member moves, connecting the spaces on both sides, thereby forming a flushing flow path from the water inlet to the sewage outlet within the pre-filter. Simultaneously, the elastic member undergoes elastic deformation. When the pre-filter switches from flushing mode to filtering mode, the elastic member recovers its deformation, thereby driving the movable member back to the position corresponding to the filtering mode. That is, the movable member returns to the position separating the spaces on both sides. Thereafter, in the absence of external forces, the movable member can remain stably in its current position, providing a stable working environment for the pre-filter's filtration process. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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.

[0033] Figure 1 A schematic structural diagram of an embodiment of a pre-filter provided by the present utility model;

[0034] Figure 2 This is a schematic cross-sectional view of an embodiment of the pre-filter provided by the present invention in filtering mode;

[0035] Figure 3 for Figure 2 A partial enlarged view of point A in the middle;

[0036] Figure 4 for Figure 2 A partial enlarged view of point B in the middle;

[0037] Figure 5 This is a schematic cross-sectional view of an embodiment of the pre-filter provided by the present invention in flushing mode;

[0038] Figure 6 for Figure 5 A partial enlarged view of point C in the middle;

[0039] Figure 7 for Figure 5 A partial enlarged view of point D in the middle;

[0040] Figure 8This is a structural diagram of an embodiment of the exoskeleton of the pre-filter provided by the present invention;

[0041] Figure 9 A schematic structural diagram of an embodiment of the movable part of the pre-filter provided by the present utility model from two perspectives;

[0042] Figure 10 A structural diagram of an embodiment of a reversing member of a pre-filter provided by the present utility model;

[0043] Figure 11 This is a schematic diagram of the assembly structure of the movable parts, reversing parts and filter components of the pre-filter provided by the utility model.

[0044] Description of Figure Numbers:

[0045] 10. Filter bottle; 101. Water filter chamber; 102. Sewage outlet;

[0046] 20, valve head; 201, water inlet; 202, water outlet;

[0047] 30. Filter component;

[0048] 50, exoskeleton; 501, siphon flow channel; 501a, side wall flow channel; 501b, bottom flow channel; 503, first discharge port; 511, chassis; 512, side frame; 540, shielding portion;

[0049] 710, reversing bottom shell; 711, sealing ring surface;

[0050] 720, reversing member; 721, connecting portion; 722, blocking portion; 723, hollow tube section;

[0051] 730, movable part; 731, blocking part; 7311, flow outlet; 7312, mounting protrusion; 732, connecting part; 734, sealing part; 7301, water inlet side; 7302, water outlet side;

[0052] 80. Sewage discharge assembly; 810. Connector; 820. Sewage discharge valve;

[0053] 1001. Fastener; 1003. Elastic part.

[0054] 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

[0055] 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.

[0056] 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.

[0057] 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.

[0058] As people's living standards continue to improve, their demands for daily water use are also increasing. Due to long-term disrepair and aging of tap water pipes, the water contains a large amount of large particles harmful to the human body, such as mud, rust, and bloodworms, which seriously affect the health of residents. Therefore, a pre-filter is provided, which has a filter assembly and other structures inside to filter out large particles before the tap water is used. However, while the pre-filter is filtering the water, impurities will adhere to the water filter cavity, especially the surface of the filter assembly. Over time, this will clog the filter assembly and reduce the filtering effect of the filter assembly.

[0059] The utility model proposes a pre-filter, the internal components of which can realize the switching of the internal flow channel, so that the internal filter assembly can be cleaned regularly to discharge the large particulate matter previously intercepted, thereby eliminating the need for manual disassembly and cleaning of the pre-filter, thereby increasing the service life of the pre-filter.

[0060] 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.

[0061] See also Figure 1 、 Figure 2 and Figure 5 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.

[0062] 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.

[0063] The valve head 20 comprises a connected metal outer shell and a plastic inner lining, with the water inlet 201 and outlet 202 both formed in the plastic inner lining. This allows water flowing through the pre-filter to directly contact the plastic inner lining, rather than the metal outer shell. This prevents water contamination by metallic elements emanating from the metal outer shell, while also enhancing the pre-filter's aesthetics and housing strength.

[0064] 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).

[0065] 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.

[0066] 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 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. The sewage outlet 102 corresponds to different working modes of the pre-filter and can be switched between open and closed.

[0067] In one embodiment of the present invention, please refer to Figure 2 、 Figure 3 、 Figure 5 and Figure 6 The pre-filter further includes a movable member 730 movably disposed in the water filter chamber 101, 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 flow port 7311. In the flushing mode, the spaces on both sides of the movable member 730 are connected through the flow port 7311. In the filtering mode, the flow port 7311 is blocked, thereby isolating the spaces on both sides of the movable member 730.

[0068] 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 connect the space on both sides, so that the water inlet 201 and the sewage outlet 102 can be connected.

[0069] 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.

[0070] 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.

[0071] Therefore, in the technical solution of the present invention, the pre-filter has a flushing mode, which can regularly clean impurities attached to the filter assembly 30, thereby ensuring the filtering effect of the filter assembly 30 and extending the service life of the pre-filter. In addition, the movable member 730 can switch between different positions to effectively ensure the working performance of the pre-filter in different operating modes.

[0072] Furthermore, in this embodiment, please refer to Figure 2 、 Figure 3 、 Figure 5 and Figure 6 The movable member 730 is connected to an elastic member 1003. Under the action of the elastic member 1003, the movable member 730 naturally maintains the position corresponding to the filtering mode. In this way, when the pre-filter switches from filtering mode to flushing mode, the water outlet 202 is closed and the sewage outlet 102 is opened, resulting in a pressure difference between the water inlet 201 and the sewage outlet 102. The side of the movable member 730 close to the water inlet 201 will be subjected to pressure, causing the movable member 730 to move toward the sewage outlet 102, so that the space on both sides of the movable member 730 is connected, thereby forming a flushing flow path from the water inlet 201 to the sewage outlet 102 in the pre-filter. At the same time, the elastic member 1003 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 1003 will resume its deformation, thereby driving 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.

[0073] In one embodiment, please refer to Figure 2 、 Figure 3 、 Figure 5 and Figure 6 The movable part 730 includes a sealing portion 731 and a connecting portion 732 provided on the side of the sealing portion 731 away from the sewage outlet 102. The water inlet 201 and the sewage outlet 102 are respectively provided on both axial sides of the sealing portion 731. The outlet side 7302 of the flow outlet 7311 passes through the side of the sealing portion 731 close to the sewage outlet 102. The water inlet side 7301 of the flow outlet 7311 extends axially to the connecting portion 732 and radially passes through the radial side of the connecting portion 732. In the filtering mode, the blocking portion 540 blocks the water inlet side 7301 of the flow outlet 7311.

[0074] 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.

[0075] It can be understood that the movement of the movable member 730 can change the relative position of the water inlet side 7301 of the flow port 7311 and the shielding portion 540. Specifically, Figure 3 As shown, in the filtering mode, the position of the movable member 730 will cause the blocking portion 540 to block the water inlet side 7301 of the flow port 7311, and the space on both sides of the blocking portion 731 axially can be isolated, so that the water inlet 201 and the sewage outlet 102 are not connected to each other; Figure 6 As shown, in the flushing mode, the position of the movable member 730 will cause the water inlet side 7301 of the flow port 7311 to be separated from the blocking portion 540, and the water inlet side 7301 of the flow port 7311 will also be exposed, so that the water inlet 201 can be connected to the sewage outlet 102 through the flow port 7311. Of course, in other embodiments, the flow port 7311 can also be an area that axially penetrates the blocking portion 731 and is located on the periphery of the connecting portion 732.

[0076] Without loss of generality, the connecting portion 732 is axially movable, and by changing the relative axial position of the water inlet side 7301 of the flow port 7311 and the shielding portion 540, the shielding portion 540 can be detachably blocked from the water inlet side 7301 of the flow port 7311. Of course, in other embodiments, the movable member 730 can also be rotatably arranged, and by changing the relative circumferential position of the water inlet side 7301 of the flow port 7311 and the shielding portion 540, the shielding portion 540 can be detachably blocked from the water inlet side 7301 of the flow port 7311.

[0077] Without loss of generality, in the filtering mode, the shielding portion 540 abuts against the blocking portion 731, that is, the blocking portion 731 can detachably abut against the side of the shielding portion 540 close to the sewage outlet 102. Thus, through the abutment and cooperation between the shielding portion 540 and the blocking portion 731, a positioning effect can be provided for the movement of the movable part 730, ensuring that the shielding portion 540 can reliably block the water inlet side 7301 of the flow outlet 7311.

[0078] Specifically, please participate Figure 3 、 Figure 6 and Figure 8 The shielding portion 540 is annular, and the water inlet side 7301 of the flow port 7311 is housed within the shielding portion 540 in the filtering mode, and is at least partially exposed in the flushing mode. Thus, in the filtering mode, the water inlet side 7301 of the flow port 7311 and the shielding portion 540 are disposed opposite each other and can be housed within the inner circumference of the shielding portion 540. The shielding portion 540 blocks the water inlet side 7301 of the flow port 7311 by surrounding the connecting portion 732 where the water inlet side 7301 of the flow port 7311 is located. Furthermore, the flow port 7311 is formed with multiple penetrating positions along the circumference of the connecting portion 732, thereby forming multiple water inlet sides 7301. The annular shielding portion 540 can block multiple water inlet sides 7301 simultaneously. Of course, in other embodiments, the shielding portion 540 may be in an arc-shaped shape and provided corresponding to the water inlet side 7301 of the flow opening 7311 .

[0079] In one embodiment, please refer to Figure 2 、 Figure 3 、 Figure 5 and Figure 6A sealing annular surface 711 is provided in the water filter chamber 101 corresponding to the sealing portion 731. The outer periphery of the sealing portion 731 is sealed and matched with the sealing annular surface 711 and can move axially 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 always maintains a sealed and matched state with the sealing annular surface 711. In the filtering mode, this helps to ensure the isolation of the space on both sides of the axial direction of the sealing portion 731, preventing water from seeping from the side where the water inlet 201 is located to the side where the sewage outlet 102 is located, thereby affecting the filtering process of the pre-filter. In addition, the sealing annular surface 711 can provide a guide for the movement of the sealing portion 731 to ensure that the sealing portion 731 switches smoothly between different positions. Of course, in other embodiments, the outer periphery of the sealing portion 731 can also be matched with the structural clearance of the circumferential ring.

[0080] Without loss of generality, please also refer to Figure 2 、 Figure 3 、 Figure 5 、 Figure 6 and Figure 11 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 respectively abut against the blocking portion 731 and the sealing annular surface 711. 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.

[0081] In one embodiment, please refer to Figure 2 、 Figure 3 、 Figure 5 and Figure 6 The pre-filter further includes a reversing bottom shell 710, which is fixedly mounted in the water filter chamber 101. 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 passages that do not interfere with the cooperation between the movable part 730 and the shielding part 540, or the communication between the 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 engaged with the inner periphery of the reversing bottom shell 710.

[0082] Without loss of generality, the inner circumferential surface of the reversing bottom housing 710 serves as the sealing annular surface 711, and the blocking portion 731 slidably and sealingly engages with the inner circumferential surface of the reversing bottom housing 710. In this embodiment, the sealing engagement is achieved through the inner circumferential surface of the reversing bottom housing 710 and the outer circumference of the blocking portion 731. Furthermore, the inner circumference of the reversing bottom housing 710 provides guidance for the movement of the blocking portion 731, thereby ensuring that the blocking portion 731 smoothly switches between different positions. 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 slidably and sealingly engage with each other.

[0083] In one embodiment, please refer to Figure 2 、 Figure 3 、 Figure 5 、 Figure 6 and Figure 8 The pre-filter further comprises an exoskeleton 50, which is sleeved over the filter assembly 30. The exoskeleton 50 comprises a side frame 512 and a bottom plate 511. The bottom plate 511 is provided with a discharge port connected to the water inlet 201. The movable member 730 comprises a blocking portion 731. The discharge port and the sewage outlet 102 are located on either side of the blocking portion 731 in the axial direction. It can be understood that the water filter chamber 101 is divided into two spaces by the bottom plate 511. The filter assembly 30 is mounted on a side of the bottom plate 511 close to the water inlet 201, with the side frame 512 also located on this side. The blocking portion 731 is located on a side of the bottom plate 511 close to the sewage outlet 102. The spaces on both sides are connected via the discharge port on the bottom plate 511. In the filtering mode, the water inlet 201 is connected to the sewage outlet 102 via the discharge port and the flow port 7311 in sequence.

[0084] Without loss of generality, the exoskeleton 50 is rotatably arranged to disturb the water flow in the water filter chamber 101, prevent impurities from being deposited and adhering to the filter component 30, the exoskeleton 50 and the side walls of the water filter chamber 101, reduce the possibility of clogging of the filter component 30, and thus ensure the filtering effect of the filter component 30.

[0085] In one embodiment, please refer to Figure 2 、 Figure 3 、 Figure 5 and Figure 6A siphon channel 501 is formed on the outer frame 50, and a siphon hole is provided on the side frame 512, which is connected to the siphon channel 501. The discharge port includes a first discharge port 503, which is connected to the siphon channel 501. Thus, in flushing mode, when impurities and particulate matter intercepted by the filter assembly 30 are dislodged by the impact of the water flow, they are drawn into the siphon hole and siphon channel 501 by the siphon effect and more efficiently discharged to the sewage outlet 102 through the first discharge port 503. In other words, in flushing mode, impurities and particulate matter intercepted by the filter assembly 30 can be more quickly and effectively guided to the sewage outlet 102, and ultimately discharged through the sewage outlet 102, thereby improving the flushing effect of the water filter chamber 101, and particularly the filter assembly 30. Specifically, the siphon channel 501 includes a connected side wall channel 501a and a bottom channel 501b, and multiple siphon holes are distributed at intervals along the extension direction of the side wall channel 501a. The first discharge port 503 is located at the end of the bottom channel 501b, that is, at one end away from the side wall channel 501a.

[0086] In one embodiment, the drain port includes a second drain port (not shown) that is axially disposed through the bottom plate 511. This allows the spaces on both sides of the bottom plate 511 to be connected axially, increasing the flow path for sewage to flow to the drain port 102, thereby improving the drainage efficiency during the flushing process.

[0087] In one embodiment, please refer to Figure 2 、 Figure 3 、 Figure 5 、 Figure 6 and Figure 8 The exoskeleton 50 is provided with an annular shielding portion 540. The water inlet side 7301 of the flow port 7311 is arranged corresponding to the inner circumference of the shielding portion 540, and the discharge port is arranged corresponding to the outer circumference of the shielding portion 540. Specifically, the first discharge port 503 and the second discharge port are both located on the outer circumference of the shielding portion 540, and the second discharge port is arranged at a position staggered from the bottom flow channel 501b, so that the two flow paths corresponding to the first discharge port 503 and the second discharge port are independent of each other. It can be understood that in the filtering mode, the shielding portion 540 blocks the water inlet side 7301 of the flow port 7311 on its inner circumference, and the portion of the blocking portion 731 located on the outer circumference of the shielding portion 540 can separate the discharge port from the sewage outlet 102.

[0088] Specifically, the reversing bottom shell 710 is fixedly connected to a side of the bottom plate 511 near the drain outlet 102, and the drain outlet is provided corresponding to the inner circumference of the reversing bottom shell 710. Because the outer circumference of the blocking portion 731 is sealed with the inner circumference of the reversing bottom shell 710, and the drain outlet is also located on the inner circumference of the reversing bottom shell 710, when the water inlet side 7301 of the flow port 7311 is blocked by the blocking portion 540, the flow path between the drain outlet and the drain outlet 102 is also cut off by the blocking portion 731. When the water inlet side 7301 of the flow port 7311 is exposed outside the blocking portion 540, the drain outlet can be connected to the drain outlet 102 through the flow port 7311. Of course, in other embodiments, the blocking portion 731 may be provided with a protrusion corresponding to the drain outlet, and the protrusion may be inserted into the drain outlet to block the drain outlet accordingly.

[0089] In one embodiment, please refer to Figure 2 、 Figure 3 、 Figure 5 and Figure 6 The elastic member 1003 is disposed on the side of the movable member 730 that is closer to the drain outlet 102. That is, the elastic member 1003 is located on the side of the movable member 730 that is closer to the drain outlet 102. This allows the structure at the bottom of the filter bottle 10 to provide a mounting base for the elastic member 1003, preventing interference with other structures. Of course, in other embodiments, the elastic member 1003 can also be disposed on the side of the movable member 730 that is farther from the drain outlet 102.

[0090] Specifically, the elastic member 1003 is disposed on a side of the blocking portion 731 near the sewage outlet 102. It will be appreciated that the elastic member 1003 is hollow, and the flow port 7311 and the sewage outlet 102 are disposed corresponding to the inner circumferential space of the elastic member 1003. Even if the elastic member 1003 is compressed to a clearance-free fit around the circumference, sewage can still be discharged to the sewage outlet 102 through the inner circumferential space of the elastic member 1003. Alternatively, the flow channel between the outlet side of the flow port 7311 and the sewage outlet 102 may be disposed to bypass the elastic member 1003.

[0091] Furthermore, in this embodiment, please refer to Figure 2 、 Figure 3 、 Figure 5 、 Figure 6 and Figure 11The sealing portion 731 is provided with a mounting protrusion 7312 on one side thereof near the sewage outlet 102, and the elastic member 1003 is sleeved on the mounting protrusion 7312. In this way, the elastic member 1003 can be restrained by the mounting protrusion 7312, making it difficult for the elastic member 1003 to shift, thereby being stably installed between the sealing portion 731 and the sewage outlet 102, thereby stably providing a restoring force to the movable member 730. Of course, in other embodiments, a groove can be provided in the sealing portion 731 to accommodate the end of the elastic member 1003, or the elastic member 1003 can be embedded in the sealing portion 731.

[0092] Without loss of generality, please also refer to Figure 2 、 Figure 3 、 Figure 5 、 Figure 6 and Figure 9 , the mounting protrusion 7312 and the connecting portion 732 are coaxially arranged, and the outlet side 7302 of the flow port 7311 passes through the mounting protrusion 7312. In this way, the elastic member 1003 can be centrally connected to the blocking portion 731, and the inner peripheral space of the elastic member 1003 can be arranged relative to the outlet side 7302 of the flow port 7311 and the sewage outlet 102 without interfering with the communication between the outlet side 7302 of the flow port 7311 and the sewage outlet 102. Of course, in other embodiments, the flow port 7311 can be arranged to pass through the side of the blocking portion 731, and multiple mounting protrusions 7312 can be arranged around the flow port 7311, and one elastic member 1003 can be collectively sleeved on the outside of multiple mounting protrusions 7312, or multiple elastic members 1003 can be sleeved on multiple mounting protrusions 7312 in a one-to-one correspondence.

[0093] Without loss of generality, please also refer to Figure 2 、 Figure 3 、 Figure 5 and Figure 6 The housing includes a drain assembly 80, the drain port 102 is formed in the drain assembly 80, and the drain assembly 80 includes a drain valve 820. The elastic member 1003 is located between the movable member 730 and the drain valve 820, with both ends of the elastic member 1003 abutting the movable member 730 and the drain assembly 80, respectively. In this manner, the drain port 102 can be controlled open and closed via the drain valve 820. The abutment of the elastic member 1003 against the drain assembly 80 allows the elastic member 1003 to be relatively centrally positioned relative to the movable member 730, that is, relative to the fixed connection portion 732 and the hollow tube section 723, facilitating transmission between the movable member 730 and the reversing member 720. Of course, in other embodiments, the end of the elastic member 1003 away from the movable member 730 may abut the filter bottle 10 or the reversing bottom housing 710.

[0094] Furthermore, in this embodiment, please refer to Figure 2 、 Figure 3 、 Figure 5 and Figure 6 The sewage discharge assembly 80 includes a connector 810, which is mounted on the sewage outlet 102. The sewage discharge valve 820 is connected to the connector 810, and the elastic member 1003 abuts against the connector 810. Specifically, the reversing bottom shell 710 is located between the outer frame 50 and the sewage outlet 102, with one axial side mounted on the outer frame 50 and the other axial side abutting the filter bottle 10 and connected to the connector 810. One end of the elastic member 1003 abuts the blocking portion 731, and the other end abuts the connector 810. It can be understood that the connecting member 810 will also be hollow, and the sewage will flow to the sewage valve 820 through the inner peripheral space of the connecting member 810. The elastic member 1003 abuts against the connecting member 810, which can make the inner peripheral space of the elastic member 1003 and the inner peripheral space of the connecting member 810 relative and centralized, ensuring the smoothness of sewage discharge. At the same time, it is beneficial to reduce the size of the elastic member 1003, thereby saving the production cost of the pre-filter.

[0095] Without loss of generality, the elastic member 1003 is configured as a compression spring. When the water inlet 201 and the water outlet 202 are open and the sewage outlet 102 is closed, that is, when the pre-filter is in the filtering mode, the elastic member 1003 can be in a natural state, that is, the elastic member 1003 maintains its original length. The elastic member 1003 can also be in a compressed state to provide a certain pre-tightening force to the movable member 730, ensuring that the blocking portion 731 reliably isolates the chambers on both sides. When the water outlet 202 is switched to the closed state and the sewage outlet 102 is switched to the open state, that is, when the pre-filter is switched to the flushing mode, the pressure difference across the blocking portion 731 will indirectly act on the elastic member 1003, causing the elastic member 1003 to be compressed. In this way, when the pre-filter is switched back to the filtering mode, that is, when the pressure difference across the blocking portion 731 disappears, the elastic force of the elastic member 1003 will act on the blocking portion 731, thereby driving the movable member 730 to return to its previous position. Of course, in other embodiments, the elastic member 1003 may also be an elastic silicone sleeve or an elastic rubber sleeve.

[0096] In one embodiment, please refer to Figure 2 、 Figure 4 、 Figure 5 、 Figure 7 、 Figure 10 and Figure 11The 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.

[0097] It can be 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. In the filtering flow path and the flushing flow path, the flow direction of water flowing through the filter assembly 30 is opposite, and the flow direction of water is switched by the reversing member 720. 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. Specifically, the pressure difference force from the chambers on both sides and the force from the elastic member 1003 on the movable member 730 can be transmitted to the reversing member 720, thereby driving the reversing member 720 to move together. Of course, in other embodiments, the reversing member 720 and the movable member 730 may not be connected by a transmission, but may be driven by different driving sources respectively and cooperate with each other to form a flushing flow path and a filtering flow path.

[0098] Please also refer to Figure 2 and Figure 4 When the reversing member 720 is driven to the position corresponding to the filtering mode, the position of the blocking portion 722 can avoid the filtering flow path between the water inlet 201 and the water flow space, and cut off the flushing flow path between the water inlet 201 and the inner circumference of the reversing member 720, so that the filtering flow path from the water inlet 201 to the water filter chamber 101 through the water flow space is connected. At this time, since the sewage outlet 102 is closed and the water outlet 202 is opened, after the raw water enters from the water inlet 201, it can directly flow through the water flow space to the filter assembly 30 for filtration, and flow from outside to inside along the radial direction of the filter assembly 30, thereby filtering the raw water, and the filtered water flows to the water outlet 202 through the inner circumference of the reversing member 720.

[0099] Please also refer to Figure 5 and Figure 7When the reversing member 720 is driven to the position corresponding to the flushing mode, the position of the blocking portion 722 can separate the water inlet 201 and the water flow space, so as to cut off the filtration flow path between the water inlet 201 and the water filter chamber 101. The position of the connecting portion 721 can allow the water inlet 201 to connect with the inner circumference of the reversing member 720, so as to conduct the flushing flow path from the water inlet 201 to the water filter chamber 101 through the inner circumference of the reversing member 720. At this time, since the sewage outlet 102 is open and the water outlet 202 is closed, the raw water enters from the water inlet 201, enters the inner circumference of the reversing member 720 through the connecting portion 721, and then flows to the filter assembly 30 to flush the filter assembly 30, and finally is discharged from the sewage outlet 102.

[0100] 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.

[0101] 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.

[0102] 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 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 part 721 is located, and finally flows to the water outlet 202.

[0103] 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 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 by the reversing member 720. Specifically, the water 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 siphon channel 501 and the flow port 7311 in turn.

[0104] In an embodiment of the present invention, a filtering structure is provided around the circumference of the connecting portion 721. Specifically, the peripheral wall of the connecting portion 721 includes a porous structure that communicates with the water inlet 201. This allows raw water flowing from the water inlet 201 into the water filter chamber 101 to pass through during flushing mode, allowing the raw water to flow into the inner circumference of the filter assembly 30 and clean the filter assembly 30 from the inside out. However, this raw water may contain impurities. If not filtered, these impurities may be trapped within the inner circumference of the filter assembly 30 during the flushing process. When the pre-filter chamber 101 switches from flushing mode to filtering mode, these impurities flow out of the water outlet 202 along with the filtered raw water, resulting in a poor initial filtration effect. Therefore, a filtering structure is also provided around the circumference of the connecting portion 721. This filtering structure is often configured as a filter screen, which can be fixed to the inside or outside of the porous structure by bonding, or integrally formed with the connecting portion 721.

[0105] In one embodiment, the movable member 730 is fixedly connected to the reversing member 720. Specifically, the movable member 730 includes a connecting portion 732 and a blocking portion 731. The movable member 730 is fixedly connected to the reversing member 720 via the connecting portion 732, and the space on both sides of the movable member 730 is separated by the blocking portion 731. Thus, the fixed connection between the movable member 730 and the reversing member 720 enables the two to move in a coordinated manner, so that the pressure differential force exerted on the movable member 730 by the chambers on both sides and the force exerted on the movable member 730 by the elastic member 1003 are both transmitted to the reversing member 720, thereby driving the reversing member 720 to move together.

[0106] In one embodiment, please refer to Figure 2 、 Figure 3 、 Figure 5 、 Figure 6 and Figure 11 The connecting portion 732 and the hollow tube section 723 are fixedly connected on the inner side of the filter assembly 30. In this way, 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 be linked, thereby realizing a transmission connection between the reversing 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 they may be arranged relative to each other with a distance, and transmission is performed between the two via the elastic member 1003, one end of the elastic member 1003 being sleeved and abutting the connecting portion 732, and the other end being sleeved and abutting the hollow tube section 723.

[0107] For more details, please refer to Figure 2 、 Figure 3 、 Figure 5 and Figure 6, 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 passed 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 passing of the combined component of the two through the filter assembly 30, and the two and the filter assembly 30 can be easily assembled in place. Specifically, the connecting portion 732 of the movable member 730 is inserted into the filter assembly 30 from the port of the filter assembly 30 close to the sewage outlet 102, and the hollow tube section 723 of the reversing member 720 is inserted into the filter assembly 30 from the port of the filter assembly 30 away from the sewage outlet 102. The connection between the connecting portion 732 and the hollow tube section 723 is located on the inner side of the filter assembly 30. Of course, in other embodiments, the connecting portion 732 and the hollow tube section 723 can also be fixedly connected by screw locking, bonding, or welding.

[0108] In one embodiment, see Figure 9 and Figure 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 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 matching between the blocking portion 731 and the sealing ring surface 711, and the connection between the connecting portion 732 and the hollow pipe section 723.

[0109] 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.

[0110] 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 disposed in the water filter chamber, so that the pre-filter has a filtering mode and a flushing mode. The movable member is connected to an elastic member. Under the action of the elastic member, the movable member can naturally maintain a position corresponding to the filtering mode. The water inlet, the water outlet and the filter assembly are disposed on one side of the movable member, and the sewage outlet is disposed on the other side of the movable member. The movable part is provided with a flow port. In the flushing mode, the spaces on both sides of the movable part are connected through the flow port. In the filtering mode, the flow port is blocked, so that the spaces on both sides of the movable part are separated.

2. The prefilter according to claim 1, wherein The elastic member is arranged on a side of the movable member close to the sewage outlet; And / or, the movable member is arranged to be axially movable relative to the housing.

3. The prefilter according to claim 1, wherein: A shielding portion is fixedly provided in the water filter chamber, and the movable part includes a sealing portion and a connecting portion provided on the side of the sealing portion away from the sewage outlet, the water inlet and the sewage outlet are respectively provided on both axial sides of the sealing portion, the water outlet side of the flow port penetrates to the side of the sealing portion close to the sewage outlet, the water inlet side of the flow port extends axially to the connecting portion, and radially penetrates the radial side surface of the connecting portion. In the filtering mode, the shielding portion blocks the water inlet side of the flow port.

4. The prefilter according to claim 3, characterized in that The connecting portion is axially movable so that the shielding portion can be detachably blocked on the water inlet side of the flow opening.

5. The pre-filter according to claim 4, characterized in that The shielding portion is annular, and the water inlet side of the flow port is accommodated in the shielding portion in the filtering mode and is at least partially exposed to the outside in the flushing mode.

6. The prefilter according to claim 3, characterized in that The elastic member is arranged on a side of the blocking portion close to the sewage outlet.

7. The prefilter according to claim 6, wherein: A mounting protrusion is protruded from one side of the blocking portion close to the sewage outlet, and the elastic member is sleeved on the mounting protrusion.

8. The pre-filter according to claim 7, characterized in that The mounting protrusion and the connecting portion are coaxially arranged, and the water outlet side of the flow port passes through the mounting protrusion.

9. The pre-filter according to claim 3, characterized in that: A sealing annular surface is provided in the water filtering cavity corresponding to the blocking portion. The outer periphery of the blocking portion is sealed and matched with the sealing annular surface and can move relative to the sealing annular surface along the axial direction.

10. The pre-filter according to claim 9, characterized in that: The pre-filter also includes a reversing bottom shell, which is fixedly installed in the water filter chamber. The reversing bottom shell is hollow, and 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.

11. The prefilter according to claim 1, wherein The pre-filter also includes an exoskeleton, which is sleeved outside the filter assembly. The exoskeleton includes a side frame and a chassis. The chassis is provided with a discharge port connected to the water inlet. The movable part includes a sealing part, and the discharge port and the sewage outlet are respectively arranged on both axial sides of the sealing part.

12. The pre-filter according to claim 11, wherein A siphon flow channel is formed on the outer frame, a siphon hole connected to the siphon flow channel is provided on the side frame, and the discharge port includes a first discharge port connected to the siphon flow channel; And / or, the discharge port includes a second discharge port, and the second discharge port is arranged to penetrate the chassis along the axial direction.

13. The pre-filter according to claim 12, wherein: The outer frame is provided with an annular shielding portion, the water inlet side of the flow port is arranged corresponding to the inner peripheral side of the shielding portion, and the discharge port is arranged corresponding to the outer peripheral side of the shielding portion.

14. The pre-filter according to claim 13, wherein: The pre-filter also includes a reversing bottom shell, which is fixedly connected to a side of the chassis close to the sewage outlet. The blocking portion is slidably connected to the reversing bottom shell, and the discharge outlet is arranged corresponding to the inner circumference of the reversing bottom shell.

15. The pre-filter according to claim 1, wherein The shell includes a sewage discharge component, the sewage outlet is formed in the sewage discharge component, the sewage discharge component includes a sewage discharge valve, the elastic member is located between the movable member and the sewage discharge valve, and the two ends of the elastic member are respectively in contact with the movable member and the sewage discharge component.

16. The pre-filter according to claim 15, characterized in that The sewage discharge assembly includes a connecting piece, the connecting piece is installed at the sewage discharge port, the sewage discharge valve is connected to the connecting piece, and the elastic piece abuts against the connecting piece.

17. 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.

18. The pre-filter according to claim 17, wherein: The movable part includes a sealing part and a connecting part connected to one axial side of the sealing part. The water inlet and the sewage outlet are respectively arranged on both axial sides of the sealing part and are separated by the sealing part in the filtering mode. The connecting part and the hollow pipe section are fixedly connected.

19. The pre-filter according to claim 18, wherein The connecting portion and the hollow tube section are fixedly connected on the inner side of the filter assembly; And / or, the connecting portion and the hollow pipe section are connected via threads.

20. A water system, characterized in that: The pre-filter comprises the pre-filter according to any one of claims 1 to 19.

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