Pre-filter and water system

Abstract

The invention discloses a pre-filter and a water consuming system, and relates to the technical field of filters, a shell of the pre-filter is provided with a water filtering cavity, a water inlet, a water outlet and a sewage draining exit, a waterproof ring is arranged between the water inlet and the water outlet, the water inlet is communicated with the outer peripheral side of the waterproof ring, and the water outlet is communicated with the inner peripheral side of the waterproof ring; the filtering assembly is movably arranged in the water filtering cavity, so that the pre-filter is switched between a filtering mode and a flushing mode, the filtering assembly is hollow and comprises a first filtering part, a blocking part and a second filtering part which are axially distributed in sequence and are in transmission connection, and the first filtering part is connected with the water separation ring in an inserted mode; in the filtering mode, at least the water separation ring separates a flushing flow path between the water inlet and the first filtering part; in the flushing mode, the blocking part blocks the filtering flow path between the water inlet and the second filtering part. According to the technical scheme, the filtering effect of the filtering assembly can be guaranteed, and the service life of the pre-filter is prolonged.

Description

Technical Field

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

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

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

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

[0005] A shell having a water filter cavity and a water inlet, a water outlet and a sewage outlet connected to the water filter cavity, wherein the shell is provided with a water isolating ring between the water inlet and the water outlet, the water inlet is connected to the outer peripheral side of the water isolating ring, and the water outlet is connected to the inner peripheral side of the water isolating ring; and

[0006] A filter assembly is movably disposed in the water filter cavity, so that the pre-filter can switch between a filter mode and a flushing mode. The filter assembly is hollow and comprises a first filter portion, a baffle portion, and a second filter portion which are sequentially distributed along the axial direction and are transmission-connected. The first filter portion is plugged into the water-isolating ring.

[0007] In the filtering mode, at least the water isolating ring blocks the flushing flow path between the water inlet and the first filter part, and the filtering flow path between the water inlet and the second filter part is connected;

[0008] In the flushing mode, the blocking portion blocks the filtering flow path between the water inlet and the second filter portion, and the flushing flow path between the water inlet and the first filter portion is connected.

[0009] In one embodiment, the filter assembly is axially movable, and the baffle is configured as an annular structure;

[0010] In the filtering mode, the blocking portion abuts against the water isolation ring to block the flushing flow path between the water inlet and the first filtering portion;

[0011] In the flushing mode, the baffle and the water-isolating ring are spaced apart in the axial direction, and the first filter portion is at least partially located between the baffle and the water-isolating ring to conduct the flushing flow path between the water inlet and the first filter portion.

[0012] In one embodiment, the pre-filter further comprises an exoskeleton disposed in the water filter cavity, and the exoskeleton is sleeved on the filter assembly at intervals;

[0013] In the filtering mode, the baffle is spaced apart from the shell and the outer frame to conduct the filtering flow path between the water inlet and the second filtering part;

[0014] In the flushing mode, the blocking portion abuts against the outer frame to block the filtering flow path between the water inlet and the second filtering portion.

[0015] In one embodiment, in the flushing mode, the outer periphery of the baffle portion abuts against the inner periphery of the outer frame.

[0016] In one embodiment, a sealing ring is provided on the outer periphery of the baffle portion, and the baffle portion is sealed and fitted with the outer frame through the sealing ring.

[0017] In one embodiment, the baffle is protruding from the outer periphery of the filter assembly, and in the filtering mode, the baffle abuts against the end surface of the water isolation ring.

[0018] In one embodiment, the pre-filter also includes a water pressure drive disk arranged on the side of the filter assembly facing the sewage outlet, the filter assembly and the water pressure drive disk are both arranged between the water inlet and the sewage outlet, and the water inlet and the sewage outlet are arranged along the axial direction of the filter assembly.

[0019] In one embodiment, the pre-filter further comprises an exoskeleton sleeved on the filter assembly, and a shift plate fixed to the exoskeleton, wherein the shift plate is arranged on a side of the water pressure drive plate facing the sewage outlet;

[0020] In the flushing mode, the water pressure driving disc abuts against the shift disc.

[0021] In one embodiment, the outer frame is provided with a drain port, and in the flushing mode, two opposite sides of the water pressure drive disc and the shift disc are connected through the drain port.

[0022] In one embodiment, the outer peripheral side of the shift plate abuts against the inner peripheral wall of the outer frame, the drain port penetrates the peripheral wall of the outer frame opposite to the shift plate, and a drainage gap is formed between the drain port and the edges on both axial sides of the shift plate.

[0023] In one embodiment, the outer peripheral side of the shift plate abuts against the inner peripheral wall of the outer frame through a flexible ring.

[0024] In one embodiment, a third guide limit portion is provided on a side of the hydraulic drive disc facing the shift disc, and a guide limit hole is correspondingly provided on the shift disc. The third guide limit portion is slidably inserted into the guide limit hole along the axial direction of the filter assembly.

[0025] In one embodiment, the third guide limiting portion includes a limiting column and a guide rib connected to each other, and along the axial direction of the filter assembly, the length of the limiting column is greater than the length of the guide rib, and the guide rib extends along the circumferential direction of the filter assembly;

[0026] The guide limiting hole comprises a first section and a second section which are connected in sequence, wherein the first section is for inserting the limiting column, and the second section is for inserting the guide rib.

[0027] In one embodiment, the end surface of the guide rib extends obliquely along the circumference of the filter assembly.

[0028] In one embodiment, the axis of the shift plate is provided with a positioning ring groove, and the inner ring of the positioning ring groove is installed with a positioning member protruding toward the water pressure drive plate, the water pressure drive plate is provided with a positioning column protruding toward the shift plate, and the positioning column is provided with a positioning hole;

[0029] In the flushing mode, the positioning column is inserted into the positioning ring groove, and the positioning member is inserted into the positioning hole.

[0030] In one embodiment, the pre-filter further comprises an elastic member, wherein the elastic member is connected to the filter assembly so that the filter assembly can be maintained at a position corresponding to the filter mode.

[0031] In one embodiment, the pre-filter further comprises an outer frame which is spaced apart and sleeved on the filter assembly, and the elastic member is arranged between the baffle portion and the outer frame.

[0032] In one embodiment, the baffle is protruding from the outer periphery of the filter assembly, a step surface is formed on the inner periphery of the outer skeleton, the elastic member is sleeved on the filter assembly, and one end of the elastic member abuts against the baffle, and the other end abuts against the step surface.

[0033] In one embodiment, the first filter portion is movably plugged into the water-isolating ring; and / or the first filter portion and the second filter portion are respectively fixed on opposite sides of the baffle portion.

[0034] In one embodiment, the second filter portion includes a plurality of filter modules, a water flow cavity is formed inside the filter module, the filter module is formed with a first water flow port and a second water flow port connected to the water flow cavity, the second water flow port is provided with a filter element, the filter element is arranged in an annular shape, and has an inner ring edge and an outer ring edge, and the outer ring edge is located on one axial side of the inner ring edge, and the plurality of filter modules are connected in sequence along the axial direction.

[0035] In one embodiment, the filter module includes two support frames distributed along the axial direction, the water passage cavity is formed between the two support frames, each support frame is provided with a filter element, and the inner ring edge and the outer ring edge of two adjacent filter elements are distributed in opposite directions.

[0036] In one embodiment, the supporting skeleton includes an oblique supporting portion, the two ends of the oblique supporting portion are respectively connected to a first ring portion and a second ring portion, the two oblique supporting portions of the same filter module are connected through the second ring portion, the first water outlet is provided on the inner periphery of the first ring portion, and the second water outlet is provided on the oblique supporting portion.

[0037] In one embodiment, an outer diameter of the second ring portion is greater than an outer diameter of the first ring portion.

[0038] In one embodiment, each of the supporting frames is provided with the second ring portion, the two second ring portions of the same filter module are detachably connected, and the first ring portions of two adjacent filter modules are detachably connected.

[0039] The present invention also provides a water use system, comprising the pre-filter as described above.

[0040] The technical solution of the present invention is to set a water filter cavity and a water inlet and a water outlet connected to the water filter cavity in the shell, and the shell is provided with a water isolating ring between the water inlet and the water outlet, the water inlet is connected to the outer peripheral side of the water isolating ring, and the water outlet is connected to the inner peripheral side of the water isolating ring. The pre-filter also includes a filter assembly, which can be movably arranged in the water filter cavity so that the pre-filter can switch between a filter mode and a flushing mode. The filter assembly is hollow and includes a first filter part and a second filter part that are axially distributed and transmission-connected, and the first filter part is plugged into the water isolating ring. The filter assembly also includes a baffle part, which is located between the first filter part and the second filter part.

[0041] In the filtering mode, the flushing flow path between the water inlet and the first filter part is blocked, and the filtering flow path between the water inlet and the second filter part is connected; so that after the raw water enters from the water inlet, it flows directly to the second filter part for filtration, and flows from the outside to the inside along the radial direction of the second filter part, thereby filtering the raw water, and then under the action of water pressure, it flows toward the water outlet through the internal space of the filter component; in the flushing mode, the flushing flow path between the water inlet and the first filter part is connected, and the filtering flow path between the water inlet and the second filter part is blocked; so that after the raw water enters from the water inlet, it flows from the outer peripheral side to the inner peripheral side of the first filter part, thereby preliminarily filtering impurities in the raw water, and then flows to the second filter part, and flows from the inside to the outside along the radial direction of the second filter part to flush the filter component, and finally flows to the sewage outlet.

[0042] Therefore, in the present solution, a water-isolating ring and a baffle are arranged in the water filter chamber, and the baffle is located between the first filter part and the second filter part. The baffle can move with the first filter part and the second filter part relative to the water-isolating ring, thereby controlling the conduction and isolation of the water inlet with the first filter part and the second filter part respectively, thereby controlling the pre-filter to switch between the filtering mode and the flushing mode, realizing self-flushing of the internal filtering components of the pre-filter, facilitating the cleaning of the pre-filter, and thereby increasing the service life of the pre-filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0044] Figure 1 A schematic structural diagram of an embodiment of a pre-filter provided by the present invention;

[0045] Figure 2 for Figure 1 A cross-sectional view of the pre-filter in filtering mode;

[0046] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0047] Figure 4 for Figure 1 A cross-sectional view of the pre-filter in flushing mode;

[0048] Figure 5 for Figure 4 A partial enlarged view of point B in the middle;

[0049] Figure 6 for Figure 1 Schematic diagram of the assembly structure of the middle filter component and the outer skeleton;

[0050] Figure 7 for Figure 6 A partial enlarged view of point C in the middle;

[0051] Figure 8 for Figure 1 An angled structural diagram of the water pressure drive disc;

[0052] Fig. 9 for Figure 1 Another structural diagram of the water pressure drive disc;

[0053] Fig.10 for Figure 1 A schematic diagram of the structure of the middle gear plate at an angle;

[0054] Fig.11 for Figure 1 Another structural diagram of the middle gear plate from another angle;

[0055] Fig.12 for Figure 1 The structural diagram of the filtering module;

[0056] Fig.13 for Figure 1 Exploded view of the filtering module.

[0057] Description of Figure Numbers:

[0058] 10. filter bottle; 101. water filter chamber; 102. sewage outlet;

[0059] 20, valve head; 201, water inlet; 202, water outlet; 203, water isolation ring;

[0060] 30. Filter assembly; 301. First filter part; 302. Second filter part; 303. Blocking part; 3031. Sealing ring;

[0061] 300, filter module; 310, support frame; 311, oblique support portion; 312, first ring portion; 313, second ring portion; 320, filter element; 321, inner ring edge; 322, outer ring edge; 330, first water outlet; 340, water passage cavity; 350, second water outlet;

[0062] 50, external frame; 542, drainage outlet; 5421, drainage gap; 543, step surface;

[0063] 740, elastic member;

[0064] 750, hydraulic drive disc; 751, third guide limiting portion; 752, limiting column; 753, guide rib; 754, positioning column; 755, positioning hole;

[0065] 760, shift plate; 761, flexible ring; 762, guide limit hole; 763, first section; 764, second section; 765, positioning ring groove; 766, positioning piece.

[0066] 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

[0067] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0068] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0069] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0070] The present invention proposes a pre-filter, the interior of which can realize the switching of the internal flow channel, so that the filter component 30 inside 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.

[0071] Water use systems, such as whole-house water purification systems, are usually equipped with pre-filters, which are used to filter large particles in tap water. This not only ensures the safety of residents' water use, but also extends the service life of home appliances, prevents blockage of household water pipes, and improves the health of residents. The pre-filter is the first coarse filtration device in the whole-house water purification system. It is a physical filtration device that is mainly used to intercept large particles larger than 40 microns to protect the safety of back-end water use.

[0072] See also Figure 1 , Figure 2 and Figure 4 In one embodiment of the present invention, the pre-filter includes a shell, the shell has a water filter chamber 101, and a water inlet 201 and a water outlet 202 connected to the water filter chamber 101, the shell is provided with a water isolation ring 203 between the water inlet 201 and the water outlet 202, the water inlet 201 is connected to the outer peripheral side of the water isolation ring 203, and the water outlet 202 is connected to the inner peripheral side of the water isolation ring 203.

[0073] The shell is usually formed in two parts, so the shell includes a filter bottle 10 and a valve head 20 connected to the filter bottle 10, the water filter chamber 101 is at least provided in the filter bottle 10, the water inlet 201, the water outlet 202 and the water isolation ring 203 are all provided in the valve head 20, the water isolation ring 203 is at least located on the inner side of the valve head 20, the water inlet 201 is connected to the outer peripheral side of the water isolation ring 203, and the water outlet 202 is connected to the inner peripheral side of the water isolation ring 203, thereby separating the water inlet 201 and the water outlet 202, so as to facilitate the control of the connection between the water inlet 201 and the water outlet 202.

[0074] 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 water pipe, a water tower or a well water, and the water use end can be a faucet, a shower or a drinking water outlet, and this application does not make specific limitations on this.

[0075] Among them, the connection method between the valve head 20 and the filter bottle 10 mainly adopts threaded connection. For example, the valve head 20 is convexly provided with an external threaded tube, and the bottle mouth of the filter bottle 10 is correspondingly provided with an internal thread for the external threaded tube to be screwed. The water inlet 201 and the water outlet 202 are both formed on the valve head 20. The valve head 20 is made of metal material, so the water isolation ring 203 can be installed on the valve head 20 in the form of a snap-on or threaded connection. In order to reduce the possibility of rusting of the metal material, the outside of the metal material can be covered with a layer of plastic protective shell. In other embodiments, the valve head 20 can also be made of metal outer shell and plastic inner lining material, which is not specifically limited in this application. For example, the material of the metal material can be a copper alloy, such as brass, and the material of the plastic can be PP (polypropylene) or PVC (polyvinyl chloride).

[0076] The pre-filter also includes a filter assembly 30 disposed in the water filter chamber 101. After the raw water (such as tap water or well water) flows into the water inlet 201 from the external water source, it can flow through the filter assembly 30 for filtration. The filter assembly 30 can intercept large particles of impurities in the water and remove some precipitated impurities, rust, sand, mud, bacteria and other particulate impurities generated in the pipeline, which plays a good protective function for water purifiers, washing machines, showers, high-end faucets, downstream pipelines, etc., and reduces the risk of damage to these devices due to clogging by impurities. The form and structure of the filter assembly 30 are not limited, and the filter assembly 30 can be a stainless steel filter or a PP cotton filter.

[0077] The pre-filter is usually a "T"-shaped structure, with the left and right ends of the upper "horizontal" position being the water inlet 201 and the water outlet 202 respectively, the water-isolating ring 203 is arranged toward the lower "vertical", and the lower "vertical" is used to install the filter assembly 30, and its lower end (the end away from the water inlet 201) usually has a sewage outlet 102, and its opening and closing are controlled by a sewage valve.

[0078] See again Figure 1 , Figure 2 and Figure 4 The filter assembly 30 is movably disposed in the water filter chamber 101, so that the pre-filter can switch between the filtering mode and the flushing mode. The filter assembly 30 is hollow and includes a first filter portion 301, a baffle portion 303 and a second filter portion 302 which are sequentially axially distributed and transmission-connected. The first filter portion 301 is plugged into the water isolation ring 203.

[0079] In the filtering mode, the water isolating ring 203 and the blocking part 303 jointly block the flushing flow path between the water inlet 201 and the first filtering part 301, and the filtering flow path between the water inlet 201 and the second filtering part 302 is connected;

[0080] In the flushing mode, the blocking portion 303 blocks the filtering flow path between the water inlet 201 and the second filter portion 302 , and the flushing flow path between the water inlet 201 and the first filter portion 301 is open.

[0081] Specifically, the filter assembly 30 is disposed in the water filter chamber 101, and the filter assembly 30 is hollow, so that the water flow inside and outside the filter assembly 30 is constantly exchanged, thereby filtering the raw water or cleaning the filter assembly 30. Therefore, in this solution, the filter assembly 30 includes a first filter part 301, a baffle part 303, and a second filter part 302 that are sequentially distributed along the axial direction and transmission-connected, so that the first filter part 301 and the second filter part 302 can move together in the water filter chamber 101, so that the movement of the filter assembly 30 can change the connection relationship between the filter assembly 30 and the water inlet 201, thereby changing the flow direction of the water flow, so that the pre-filter can be switched between the filtering mode and the flushing mode.

[0082] In filter mode (see Figure 2 ), the flushing flow path between the water inlet 201 and the first filter part 301 is blocked, and the filtering flow path between the water inlet 201 and the second filter part 302 is connected; so that after the raw water enters from the water inlet 201, it directly flows to the second filter part 302 for filtration, and flows from the outside to the inside along the radial direction of the second filter part 302, thereby filtering the raw water, and then under the action of water pressure, it flows through the internal space of the filter assembly 30 toward the water outlet 202; in the flushing mode (see Figure 4 ), the flushing flow path between the water inlet 201 and the first filter part 301 is connected, and the filtering flow path between the water inlet 201 and the second filter part 302 is blocked; so that after the raw water enters from the water inlet 201, it flows from the outer peripheral side to the inner peripheral side of the first filter part 301, thereby preliminarily filtering impurities in the raw water, and then flows to the second filter part 302, and flows from the inside to the outside along the radial direction of the second filter part 302 to flush the filter component 30, and finally flows to the sewage outlet 102.

[0083] Therefore, in this solution, a water-isolating ring 203 and a baffle 303 are arranged in the water filter chamber 101, and the baffle 303 is located between the first filter part 301 and the second filter part 302. The baffle 303 can move with the first filter part 301 and the second filter part 302 relative to the water-isolating ring 203, thereby controlling the conduction and isolation of the water inlet 201 with the first filter part 301 and the second filter part 302 respectively, thereby controlling the pre-filter to switch between the filtering mode and the flushing mode, realizing self-flushing of the internal filter component 30 of the pre-filter, facilitating the cleaning of the pre-filter, and thereby increasing the service life of the pre-filter.

[0084] The first filter part 301 can be movably plugged into the water-isolating ring 203 (hereinafter, this is used as an example for explanation), so as to ensure the stable movement of the pre-filter, and when the first filter part 301 moves relative to the water-isolating ring 203, the water-isolating ring 203 can also act as a scraping part, so as to scrape off the impurities accumulated on the periphery of the first filter part 301, thereby reducing the possibility of impurities clogging the first filter part 301. In other embodiments, the first filter part 301 can also be movably sleeved on the water-isolating ring 203.

[0085] The first filter part 301, the second filter part 302 and the barrier part 303 can be fixed to each other, that is, the first filter part 301 and the second filter part 302 are respectively fixed to the opposite sides of the barrier part 303. At this time, the three can be formed as one piece, or installed by bonding or clamping.

[0086] The filter assembly 30 can switch the pre-filter between the filter mode and the flushing mode by axial movement. In the filter mode, the filter assembly 30 is located in the first position, and in the flushing mode, the filter assembly 30 is located in the second position. At this time, the first position and the second position are arranged along the axial direction of the filter assembly 30, and the first position is located above the second position. That is, the filter assembly 30 switches between the filter mode and the flushing mode by moving up and down. The filter assembly 30 slides upward to the first position, so that the pre-filter is in the filter mode (see Figure 2 ), so that the first filter part 301 is completely inserted into the water-isolating ring 203, so that the water-isolating ring 203 blocks the circumference of the first filter part 301, and the interval between the water-isolating ring 203 and the first filter part 301 is blocked by the baffle 303 or the sealing ring 3031, and the baffle 303 releases the blockage of the filtration flow path between the water inlet 201 and the second filter part 302; the pre-filter is switched from the filtering mode to the flushing mode, and the filter assembly 30 slides downward to the second position (see Figure 4 ), the first filter portion 301 is exposed by the edge of the water-isolating ring 203, so that the first filter portion 301 is connected to the water inlet 201. At the same time, the blocking portion 303 blocks the water inlet 201 and the second filter portion 302.

[0087] In other embodiments, the first position is located below the second position. At this time, the filter assembly 30 slides downward to the first position, so that the pre-filter is in the filtering mode; the pre-filter switches from the filtering mode to the flushing mode, and the filter assembly 30 slides upward to the second position. In other embodiments, the first position and the second position can be arranged along the circumference of the filter assembly 30, that is, the connection relationship between different structures is changed by the circumferential rotation of the filter assembly 30 to achieve the switching between the filtering mode and the flushing mode. At this time, the circumferential partial conduction of the first filter part 301 and the second filter part 302 is achieved by the circumferential misalignment of the connection position to achieve the switching between the filtering mode and the flushing mode.

[0088] When the filter assembly 30 realizes the switching between the filtering mode and the flushing mode through axial movement, in one embodiment of the present invention, please refer to Figure 2 , Figure 4 and Figure 6 , the baffle 303 is configured as a ring structure;

[0089] In the filtering mode, the baffle 303 abuts against the water blocking ring 203 to block the flushing flow path between the water inlet 201 and the first filter part 301; in the flushing mode, the baffle 303 and the water blocking ring 203 are spaced apart in the axial direction, and the first filter part 301 is at least partially located between the baffle 303 and the water blocking ring 203 to conduct the flushing flow path between the water inlet 201 and the first filter part 301.

[0090] Specifically, in filtering mode (see Figure 2 and Figure 6 ), because the first filter part 301 is inserted into the water-isolating ring 203, the outer peripheral side of the first filter part 301 is blocked, thereby preventing the raw water in the water filter chamber 101 from directly flowing into the inner periphery of the first filter part 301. However, the raw water in the water filter chamber 101 may penetrate into the first filter part 301 through the gap between the first filter part 301 and the water-isolating ring 203, which may interfere with the flow path change in the water filter chamber 101. Therefore, a baffle part 303 is provided to abut against the water-isolating ring 203, and the baffle part 303 is configured as an annular structure, thereby further blocking the gap between the first filter part 301 and the water-isolating ring 203. In other embodiments, a sealing ring 3031 may also be provided on one side of the first filter part 301 close to the baffle part 303. In the filtering mode, the sealing ring 3031 is sealed and abutted between the first filter part 301 and the water-isolating ring 203. In the flushing mode (see Figure 4 ), the baffle portion 303 and the water-isolating ring 203 are spaced apart in the axial direction, so that at least part of the second filter portion 302 leaks out from between the baffle portion 303 and the water-isolating ring 203, thereby releasing the blockage of the outer peripheral side of the first filter portion 301 by the water-isolating ring 203 and the baffle portion 303, and making the flushing flow path between the water inlet 201 and the first filter portion 301 conductive.

[0091] In order to facilitate the blocking of the outer peripheral side of the first filter part 301 by the water-blocking ring 203 and the baffle 303, in one embodiment, the baffle 303 is convexly arranged on the outer periphery of the filter assembly 30, and in the filtering mode, the baffle 303 abuts against the end face of the water-blocking ring 203. Specifically, the baffle 303 is convexly arranged on the outer periphery of the filter assembly 30, and the baffle 303 is configured as an annular structure, that is, the baffle 303 is configured as an annular edge arranged at one end of the first filter part 301 facing the second filter part 302, and in the filtering mode, the baffle 303 abuts against the end face of the water-blocking ring 203, that is, the baffle 303 is not inserted into the inner periphery of the water-blocking ring 203, thereby facilitating the movement of the filter assembly 30, reducing the friction between the two, and also reducing the gap between the first filter part 301 and the water-blocking ring 203, and improving the guiding effect of the water-blocking ring 203 on the first filter part 301. In other embodiments, in the filtering mode, the outer circumference of the baffle 303 abuts against the inner circumference of the water blocking ring 203 .

[0092] When the filter assembly 30 realizes the switching between the filtering mode and the flushing mode through axial movement, please refer to Figure 2 , Figure 4 and Figure 6 The pre-filter further includes an outer frame 50 disposed in the water filter chamber 101, and the outer frame 50 is sleeved on the filter assembly 30 at intervals;

[0093] In the filtering mode, the baffle 303 is spaced apart from the shell and the outer frame 50 to conduct the filtering flow path between the water inlet 201 and the second filter part 302; in the flushing mode, the baffle 303 abuts against the outer frame 50 to block the filtering flow path between the water inlet 201 and the second filter part 302.

[0094] Specifically, the outer frame 50 is sleeved on the outer periphery of the filter assembly 30 to support the internal structure of the pre-filter and protect the filter assembly 30 and other structures from external pressure or impact. The outer frame 50 is sleeved on the filter assembly 30 at intervals, so that there is a certain water-passing gap between the outer frame 50 and the second filter part 302, so that the filter assembly 30 can be easily filtered in the filtering mode (see Figure 2 and Figure 6 ), the baffle 303 is spaced apart from the shell and the outer frame 50, and the raw water flows into the second filter part 302 through the water gap between the outer frame 50 and the second filter part 302 to conduct the filtering flow path between the water inlet 201 and the second filter part 302; in the flushing mode (see Figure 4 ), the blocking portion 303 at least abuts against the outer frame 50, thereby blocking the water flow gap between the outer frame 50 and the second filter portion 302, so as to isolate the filtering flow path between the water inlet 201 and the second filter portion 302.

[0095] In general, the outer frame 50 is provided with a plurality of through-hole structures. To ensure the blocking effect of the baffle 303 and reduce the possibility of raw water entering the second filter 302 through the pore structure of the outer frame 50 itself, a sealing structure is provided between the baffle 303 and the outer frame 50, or the outer frame 50 is configured as a closed structure on the periphery. In this embodiment, the outer frame 50 remains stationary in the water filter chamber 101. In other embodiments, the outer frame 50 can also rotate in the water filter chamber 101.

[0096] Furthermore, in the flushing mode, the outer periphery of the baffle 303 abuts against the inner periphery of the outer frame 50. Specifically, the outer periphery of the baffle 303 abuts against the inner periphery of the outer frame 50, that is, the diameter of the baffle 303 is less than or equal to the diameter of the outer frame 50, that is, the diameter of the baffle 303 is less than the inner diameter of the shell, thereby ensuring that in the filtering mode, the baffle 303 and the shell have a sufficient gap for water to flow through. In other embodiments, the side of the baffle 303 facing the second filter part 302 abuts against the end surface of the outer frame 50.

[0097] Furthermore, a sealing ring 3031 is sleeved on the outer periphery of the baffle 303, and the sealing ring 3031 is sealed to the outer frame 50. That is, the sealing ring 3031 is arranged between the outer periphery of the baffle 303 and the inner periphery of the outer frame 50, thereby further reducing the possibility of water flow penetrating into the second filter part 302 through the gap between the baffle 303 and the outer frame 50.

[0098] To drive the filter assembly 30 to move in the water filter chamber 101, in the embodiment of the present invention, refer to Figures 4 to 7 The pre-filter also includes a water pressure drive disk 750 arranged on the side of the filter component 30 facing the sewage outlet 102. The filter component 30 and the water pressure drive disk 750 are both arranged between the water inlet 201 and the sewage outlet 102, and the water inlet 201 and the sewage outlet 102 are arranged along the axial direction of the filter component 30. Specifically, the water pressure drive disk 750 is transmission-connected with the filter assembly 30, and the filter assembly 30 and the water pressure drive disk 750 are both arranged between the water inlet 201 and the sewage outlet 102, and the water inlet 201 and the sewage outlet 102 are arranged along the axial direction of the filter assembly 30, so that in the flushing mode, the water inlet 201 and the sewage outlet 102 are both opened, and the water flows along the axial direction of the filter assembly 30 from the water outlet 202 to the sewage outlet 102, thereby causing the axial water pressure of the filter assembly 30 in the water filter chamber 101 to change, so that the water pressure drive disk 750 moves in the direction close to the sewage outlet 102, thereby driving the filter assembly 30 to move axially to realize the switching between the filtering mode and the flushing mode, thereby eliminating the need to additionally set up a driving structure to drive the filter assembly 30 to move, saving the energy consumption of the pre-filter and reducing the cost of the pre-filter.

[0099] Among them, there can be various driving forces for driving the filter assembly 30 to move up and down, such as setting an elastic member 740 in the filter assembly 30, and the elastic member 740 can make the filter assembly 30 have a tendency to move upward or downward; or the filter assembly 30 is threadedly connected to the water-blocking ring 203, and the filter assembly 30 is driven to rotate by the driving structure, thereby moving the filter assembly 30 up or downward; or a telescopic structure is provided in the water filter chamber 101, and the telescopic structure can directly push or pull the filter assembly 30 to move, thereby driving the filter assembly 30 to move upward or downward; at this time, the filter assembly 30 needs to be provided with a guide structure to guide the movement of the filter assembly 30.

[0100] When the filter assembly 30 is driven to move by the water pressure driving disk 750, in one embodiment, the pre-filter also includes an outer frame 50 mounted on the filter assembly 30, and a shift plate 760 fixed to the outer frame 50, and the shift plate 760 is arranged on the side of the water pressure driving disk 750 facing the sewage outlet 102; in the flushing mode, the water pressure driving disk 750 abuts against the shift plate 760.

[0101] Specifically, in the flushing mode, the hydraulic drive disc 750 drives the filter assembly 30 to move toward the direction close to the sewage outlet 102, but in the actual working process, the hydraulic drive disc 750 may move excessively, causing the first filter part 301 to separate from the water isolation ring 203, thereby affecting the stability of the filter assembly 30, so a stop disc 760 is provided, and the stop disc 760 is provided on the side of the hydraulic drive disc 750 facing the sewage outlet 102; in the flushing mode, the hydraulic drive disc 750 abuts against the stop disc 760, and the stop disc 760 is used to limit the hydraulic drive disc 750, thereby reducing the possibility of excessive movement of the hydraulic drive disc 750. The stop disc 760 is configured as a disc-shaped structure, thereby ensuring the limiting effect of the stop disc 760, and the stop disc 760 is fixed to the outer frame 50, thereby facilitating the installation of the stop disc 760.

[0102] The shift plate 760 can be formed separately from the outer frame 50, and the shift plate 760 can be bonded or clamped to the outer frame 50. In other embodiments, the shift plate 760 can also be integrally formed with the outer frame 50. In other embodiments, a limiting convex portion can also be convexly provided on the inner circumference of the outer frame 50, and in the flushing mode, the side of the water pressure drive plate 750 facing the sewage outlet 102 abuts against the limiting convex portion.

[0103] In order to facilitate the smooth discharge of the water flow inside the outer frame 50 to the water filter chamber 101 in the flushing mode, in the embodiment of the present invention, the outer frame 50 is provided with a drain port 542. In the flushing mode, the two opposite sides of the hydraulic drive disc 750 and the shift disc 760 are connected through the drain port 542. Specifically, in the flushing mode, the hydraulic drive disc 750 and the shift disc 760 may abut against the inner peripheral side of the outer frame 50 together, thereby blocking the water flow channel from the water inlet 201 to the sewage outlet 102, affecting the flushing function of the pre-filter. In order to overcome this structural defect, the outer frame 50 is provided with a drain port 542, which enables the two opposite sides of the hydraulic drive disc 750 and the shift disc 760 to communicate, that is, the side of the hydraulic drive disc 750 and the shift disc 760 facing the water inlet 201 is connected to the side facing the sewage outlet 102, thereby connecting the water flow channel from the water inlet 201 to the sewage outlet 102.

[0104] The drain port 542 can be configured as a drain channel, and the two axial sides of the drain channel are respectively connected to the two opposite sides of the hydraulic drive disc 750 and the shift disc 760. In other embodiments, the diameter of the hydraulic drive disc 750 can also be appropriately reduced, so that when the hydraulic drive disc 750 and the shift disc 760 are in contact, a certain gap is provided between the hydraulic drive disc 750 and the inner circumference of the outer frame 50, and a through hole connecting the gap is provided on the shift disc 760.

[0105] Furthermore, the outer peripheral side of the shift plate 760 abuts against the inner peripheral wall of the outer frame 50 , the drainage port 542 penetrates the peripheral wall of the outer frame 50 relative to the shift plate 760 , and the drainage port 542 and the edges on both axial sides of the shift plate 760 have a drainage gap 5421 . Specifically, the drain port 542 penetrates the peripheral wall of the outer frame 50 toward the shift plate 760, that is, the drain port 542 is configured as a through hole provided on the outer frame 50, and the drain port 542 and the edges on both axial sides of the shift plate 760 have a drainage gap 5421. For example, the drain port 542 can be set to have an axial length along the filter assembly 30 greater than the total thickness of the shift plate 760 and the water pressure drive plate 750 when they are in contact, and the shift plate 760 and the water pressure drive plate 750 are arranged on opposite sides of the drain port 542 along the axial direction of the filter assembly 30, so that the opposite sides of the drain port 542 along the axial direction of the filter assembly 30 can be exposed on the opposite sides of the water pressure drive plate 750 and the shift plate 760, respectively, so that the opposite sides of the water pressure drive plate 750 and the shift plate 760 are connected through the drain port 542. In other embodiments, the axial length of the drain port 542 along the filter assembly 30 may also be equal to the total thickness of the shift plate 760 and the water pressure drive plate 750 when they are in contact. At this time, the edges of the water pressure drive plate 750 and the shift plate 760 on opposite sides are provided with avoidance surfaces, and the drain port 542 forms drainage gaps 5421 on the two avoidance surfaces on the opposite sides of the axial direction of the filter assembly 30, so that the two opposite sides of the water pressure drive plate 750 and the shift plate 760 are connected through the drain port 542.

[0106] In other embodiments, the exoskeleton 50 has a bottom wall, and the drain port 542 is provided on the bottom wall, the shift plate 760 is provided on the bottom wall, and the drain port 542 is located on the outer peripheral side of the shift plate 760. At this time, the outer peripheral side of the shift plate 760 needs to be spaced apart from the inner peripheral wall of the exoskeleton 50.

[0107] To facilitate the installation of the shift plate 760, the outer peripheral side of the shift plate 760 abuts against the inner peripheral wall of the outer frame 50 through a flexible ring 761. Specifically, the outer peripheral side of the shift plate 760 abuts against the inner peripheral side of the outer frame 50, so that there is no need to set a mounting structure between the two, thereby facilitating the installation of the shift plate 760. The outer peripheral side of the shift plate 760 abuts against the inner peripheral wall of the outer frame 50 through a flexible ring 761, thereby further facilitating the installation of the shift plate 760, and the flexible ring 761 can increase the friction between the outer peripheral side of the shift plate 760 and the inner peripheral wall of the outer frame 50, thereby ensuring the stable installation of the two.

[0108] In order to facilitate the movement guidance of the hydraulic drive disc 750, in the embodiment of the present invention, please refer to Figures 4 to 11, a third guide limiter 751 is provided on the side of the hydraulic drive disc 750 facing the shift disc 760, and a guide limiter hole 762 is correspondingly provided on the shift disc 760, and the third guide limiter 751 is inserted into the guide limiter hole 762 along the axial direction of the filter assembly 30. Specifically, the third guide limiter 751 is provided on the side of the hydraulic drive disc 750 facing the shift disc 760, and a guide limiter hole 762 is correspondingly provided on the shift disc 760, and the third guide limiter 751 is inserted into the guide limiter hole 762 along the axial direction of the filter assembly 30, thereby guiding the axial movement of the hydraulic drive disc 750 relative to the shift disc 760, reducing the possibility of the hydraulic drive disc 750 being offset, and improving the movement stability of the hydraulic drive disc 750.

[0109] Among them, the guide limit hole 762 passes through the shift plate 760. On the one hand, there is no need to match the thickness size of the guide limit hole 762 with the third guide part, which helps to reduce the overall thickness of the shift plate 760. On the other hand, it can reduce the pressure formed between the third guide limit part 751 and the guide limit hole 762, making it impossible for the two to be plugged into place.

[0110] For further information, see Figure 5 , Figures 8 to 11 The third guide limiting portion 751 includes a limiting column 752 and a guide rib 753 that are connected to each other. Along the axial direction of the filter assembly 30, the length of the limiting column 752 is greater than the length of the guide rib 753, and the guide rib 753 extends along the circumferential direction of the filter assembly 30; the guide limiting hole 762 includes a first section 763 and a second section 764 that are connected in sequence, the first section 763 is for the limiting column 752 to be inserted, and the second section 764 is for the guide rib 753 to be inserted.

[0111] Specifically, the third guide limiting portion 751 includes a limiting column 752 and a guide rib 753 that are interconnected. The limiting column 752 is arranged on one side of the guide rib 753, and the length of the limiting column 752 is greater than the length of the guide rib 753, that is, the protruding height of the limiting column 752 is greater than the protruding height of the guide rib 753, and the guide rib 753 extends along the circumference of the filter assembly 30. Therefore, the width of the limiting column 752 along the circumference of the filter assembly 30 is generally smaller than the width of the guide rib 753 along the circumference of the filter assembly 30. Therefore, when the water pressure drive disk 750 moves in the direction away from the gear disk 760 to the filtering mode, the end of the limiting column 752 away from the water pressure drive disk 750 is still inserted into the first section 763, thereby limiting the movement of the water pressure drive disk 750 in the direction close to the gear disk 760, facilitating the limiting insertion of the third guide limiting portion 751 and the guide limiting hole 762. The guide rib 753 extends along the circumference of the filter assembly 30, which helps to increase the contact area between the third guide limit portion 751 and the guide limit hole 762, and improves the guiding stability. Preferably, the thickness of the limit column 752 along the radial direction of the hydraulic drive disk 750 is greater than the thickness of the guide rib 753 along the radial direction of the hydraulic drive disk 750, which helps to ensure the structural strength of the limit column 752. The guide limit hole 762 includes a first section 763 and a second section 764 that are connected in sequence. The first section 763 is for the limit column 752 to be inserted, and the second section 764 is for the guide rib 753 to be inserted, so as to cooperate with the limit column 752 and the guide rib 753 to guide the movement of the hydraulic drive disk 750.

[0112] Furthermore, the end surface of the guide rib 753 extends obliquely along the circumference of the filter assembly 30. That is, the height of the guide rib 753 is gradually reduced along the circumference of the filter assembly 30, so that during the guiding process, the contact area between the guide rib 753 and the second section 764 is gradually increased, which can reduce the friction resistance between the guide rib 753 and the second section 764 during the guiding process, and ensure the stability of the limit between the water pressure drive disk 750 and the gear disk 760 when the two are in contact.

[0113] Among them, the protruding height of the guide rib 753 is gradually reduced in the direction away from the limiting column 752, so as to facilitate the processing of the third guide limiting part 751 and enable the guide rib 753 to further increase the installation stability of the limiting column 752.

[0114] The guide rib 753 and the positioning column 754 are integrally formed on the hydraulic drive disk 750, so as to facilitate the installation of the third guide limiter 751 and ensure the stable connection between the third guide limiter 751 and the hydraulic drive disk 750. In other embodiments, the third guide limiter 751 can also be bonded or clamped to the hydraulic drive disk 750.

[0115] In order to further guide the movement of the water pressure drive disk 750, in an embodiment of the present invention, a positioning ring groove 765 is provided on the axis of the shift disk 760, and the inner ring of the positioning ring groove 765 is installed on a positioning piece 766 protruding toward the water pressure drive disk 750, and the water pressure drive disk 750 is provided with a positioning column 754 protruding toward the shift disk 760, and the positioning column 754 is provided with a positioning hole 755; in the flushing mode, the positioning column 754 is inserted into the positioning ring groove 765, and the positioning piece 766 is inserted into the positioning hole 755.

[0116] Specifically, the positioning member 766 is arranged at the axis of the shift plate 760, and the positioning member 766 is movably inserted into the positioning hole 755 located at the axis of the hydraulic drive plate 750, thereby ensuring that the axes of the hydraulic drive plate 750 and the shift plate 760 are arranged to coincide with each other, thereby further reducing the possibility of displacement of the hydraulic drive plate 750. The axis of the shift plate 760 is provided with a positioning ring groove 765, and the positioning member 766 is correspondingly provided on the inner ring of the positioning ring groove 765. The water pressure drive plate 750 is provided with a positioning column 754 corresponding to the positioning ring groove 765, and the positioning column 754 is provided with a positioning hole 755 corresponding to the positioning member 766. In the flushing mode, the positioning column 754 is inserted into the positioning ring groove 765, and the positioning member 766 is inserted into the positioning hole 755, so that the cooperation between the positioning ring groove 765 and the positioning column 754 can further guide the plug-in of the positioning member 766 and the positioning hole 755. The two guide each other, which is conducive to the stable cooperation of the water pressure drive.

[0117] The positioning member 766 can be configured as a positioning pin, which can be interference-fitted with the inner circumference of the mounting ring groove, or integrally injection-molded. The positioning column 754 is integrally formed on the hydraulic drive disk 750. In other embodiments, the positioning column 754 can also be bonded or clamped to the hydraulic drive disk 750.

[0118] See also Figure 2 and Figure 3 In the embodiment of the present invention, the pre-filter further comprises an elastic member 740, which is connected to the filter assembly 30 so that the filter assembly 30 can be maintained in a position corresponding to the filter mode. That is, the elastic member 740 can maintain the filter assembly 30 in the first position, so that when the sewage outlet 102 is closed, the water pressure in the filter chamber 101 is released, and the elastic member 740 enables the filter assembly 30 to return from the second position to the first position, thereby facilitating the movement of the filter assembly 30 without the need for an additional drive structure, so as to simplify the internal structure of the pre-filter.

[0119] Among them, if the filter assembly 30 realizes the conversion between the filtering mode and the flushing mode by rotation, the elastic member 740 can be configured as a torsion spring structure. If the filter assembly 30 realizes the conversion between the filtering mode and the flushing mode by axial movement, the elastic member 740 can be configured as a tension spring or a compression spring.

[0120] Furthermore, the pre-filter also includes an outer frame 50 that is spaced and sleeved on the filter assembly 30, and the elastic member 740 is disposed between the baffle 303 and the outer frame 50. Specifically, the elastic member 740 is disposed between the baffle 303 and the outer frame 50, thereby facilitating the installation of the elastic member 740. In other embodiments, the elastic member 740 may also be disposed between the baffle 303 and the water isolation ring 203 or between the baffle 303 and the housing.

[0121] The elastic member 740 can be configured as a spring, which is convenient for installing the elastic member 740 and can reduce the interference of elasticity on the water flow inside the water filter chamber 101. In other embodiments, the elastic member 740 can also be configured as an elastic block or an elastic sleeve. In this case, the elastic member 740 is provided with an escape space for the water flow to pass through.

[0122] If the elastic member 740 is disposed between the baffle portion 303 and the outer frame 50 , the elastic member 740 can be configured as a compression spring; if the elastic member 740 is disposed between the baffle portion 303 and the water isolation ring 203 , the elastic member 740 can be configured as a tension spring.

[0123] Furthermore, the baffle 303 is convexly arranged on the outer periphery of the filter assembly 30, a step surface 543 is formed on the inner periphery of the outer frame 50, and the elastic member 740 is sleeved on the filter assembly 30. Specifically, the elastic member 740 is sleeved on the filter assembly 30, so that the filter assembly 30 can guide the deformation of the elastic member 740. The baffle 303 is convexly arranged on the outer periphery of the filter assembly 30, and a step surface 543 is formed on the inner periphery of the outer frame 50, so that one end of the elastic member 740 abuts against the baffle 303, and the other end abuts against the step surface 543, so that there is no need to additionally set up the connection between the elastic member 740 and the baffle 303, and the connection between the elastic member 740 and the outer frame 50, so that the installation of the elastic member 740 is convenient and the installation stability of the elastic member 740 is guaranteed.

[0124] See also Figure 2 , Figure 3 , Fig.12 and Fig.13In an embodiment of the present invention, the filter assembly 30 includes a plurality of filter modules 300, a water passage cavity 340 is formed inside the filter module 300, the filter module 300 is formed with a first water passage 330 and a second water passage 350 communicating with the water passage cavity 340, the second water passage 350 is provided with a filter element 320, the filter element 320 is arranged in an annular shape, and has an inner ring edge 321 and an outer ring edge 322, and the outer ring edge 322 is located on one axial side of the inner ring edge 321, and the plurality of filter modules 300 are connected in sequence along the axial direction. The term "plurality" refers to more than two, and in the filter flow path of the pre-filter, the second water passage 350, the water passage cavity 340 and the first water passage 330 are distributed in sequence along the upstream and downstream. The provision of multiple filter modules 300 improves the modularity of the filter assembly 30. The number of filter modules 300 can be flexibly adjusted according to the model of the pre-filter (for example but not limited to the size of the filter bottle 10), thereby achieving the effect of adjusting the size of the filter assembly 30, thereby solving the problem of sharing the filter assembly 30 of pre-filters of different models. Since the filter area on each filter module 300 is fixed, by adjusting the number of filter modules 300, the total filter area of ​​the filter assembly 30 can also be adjusted, so that a suitable filter area can be set, thereby achieving the effect of improving the filtering effect.

[0125] Furthermore, the filter element 320 is annular and has an inner ring edge 321 and an outer ring edge 322, and the outer ring edge 322 is located on one axial side of the inner ring edge 321. It can be understood that the filter element 320 is arranged in an annular shape, and the outer ring edge 322 of the filter element 320 is located on one axial side of the inner ring edge 321 of the filter element 320, that is, the inner ring edge 321 and the outer ring edge 322 are not at the same height in the axial direction. Under the axial condition of the same height, the filtering area of ​​the filter element 320 can be increased, which means that under the same flow rate, the filter element 320 of this scheme can withstand a larger flow load and improve the filtering efficiency. Moreover, since the filtering area of ​​the filter element 320 of this scheme is large enough, even if a local area of ​​the filter element 320 is clogged, the remaining area of ​​the filter element 320 can continue to withstand a large flow load, which helps to extend the service life of the filter module 300, reduce the replacement frequency, and thus reduce maintenance costs.

[0126] Furthermore, the outer side surface of the filter element 320 is set in a conical surface. The design of the conical surface is conducive to the uniform distribution and smooth flow of the fluid, reduces the eddy current and turbulence of the fluid inside the filter module 300, and reduces energy loss. Specifically, the generatrix of the conical surface can be a straight line, or the generatrix of the conical surface can also be a concave arc line that is concave toward the inside of the water cavity 340, or the generatrix of the conical surface can also be a convex arc line that protrudes out of the water cavity 340. In other embodiments, the outer side surface of the filter element 320 can also be a pyramidal surface, and the cross-section of the pyramidal surface is a polygon, so that the filtering area of ​​the filter element 320 can be increased.

[0127] In the embodiment of the present invention, the filter module 300 includes two support frames 310 distributed along the axial direction, the water passage cavity 340 is formed between the two support frames 310, each support frame 310 is provided with the filter element 320, and the inner ring edge 321 and the outer ring edge 322 of the two adjacent filter elements 320 are distributed in opposite directions. It can be understood that, when the radial space in the water filter cavity 101 is constant, compared with the filter module 300 that maintains a tapered shape in one direction, the two filter elements 320 of the same filter module 300 are tapered in opposite directions, which can obtain a larger filtering area. In this way, the present embodiment can make full use of the space in the water filter cavity 101, form a larger filtering area on the peripheral side of the filter module 300, so as to ensure that the filter assembly 30 can withstand a larger flow load and improve the filtering efficiency. At the same time, a sufficiently large water passage cavity 340 can be formed in the two support frames 310 to facilitate the flow of water. Of course, in other embodiments, a filter module 300 may also include only one support frame 310 , and the first water outlet 330 , the second water outlet 350 and the water passage cavity 340 are formed on the same support frame 310 .

[0128] In an embodiment of the present invention, the support frame 310 includes an oblique support portion 311, and the two ends of the oblique support portion 311 are respectively connected with a first ring portion 312 and a second ring portion 313, and the two oblique support portions 311 of the same filter module 300 are connected through the second ring portion 313, and the inner periphery of the first ring portion 312 is provided with the first water outlet 330, and the second water outlet 350 is provided at the oblique support portion 311. In this way, the structural strength of the support frame 310 can be guaranteed, and the connection strength between the two support frames 310 can be guaranteed, so as to ensure the filtering capacity of the filter assembly 30. Of course, in other embodiments, the support frame 310 can also be set to other structural forms.

[0129] Specifically, the inclined support portion 311 includes a plurality of ribs spaced apart along the circumferential direction to form a plurality of second water outlets 350 spaced apart along the circumferential direction. The filter element 320 is stacked on the inclined support portion 311. In this way, the filter element 320 can be provided with sufficient support by the inclined support portion 311. In addition, the total flow area of ​​the second water outlet 350 is relatively large, so that the filter module 300 has sufficient flow capacity.

[0130] Specifically, the water distributor is connected to a filter module 300 that is arranged closer to the valve head 20. The first water outlet 330 of the filter module 300 is connected to the water outlet 202 through the inner peripheral space of the water distributor. The two adjacent filter modules 300 are connected by the first ring portion 312. The water flow chambers 340 of the two are connected through the first water outlet 330. The second water outlet 350 is arranged on the peripheral side of the filter component 30. In the filtering mode, the raw water located on the periphery of the filter component 30 enters the water flow chamber 340 through the second water outlet 350, and then flows to the water outlet 202 through the first water outlet 330.

[0131] Without loss of generality, the outer diameter of the second ring portion 313 is greater than the outer diameter of the first ring portion 312, so that each filter element 320 will be alternately tapered in the upper and lower directions, which can make fuller use of the space in the water filter cavity 101 to provide a larger filtering area, thereby further improving the filtering efficiency of the filter assembly 30. Of course, in other embodiments, the outer diameter of the first ring portion 312 may be greater than the outer diameter of the second ring portion 313, or there may be no definite size relationship between the diameters of the first ring portion 312 and the second ring portion 313.

[0132] In an embodiment of the present invention, each of the support skeletons 310 is provided with the second ring portion 313, and the two second ring portions 313 of the same filter module 300 are detachably connected. It can be understood that the detachable connection allows the parts to be easily separated without damaging the connector itself or adjacent parts. This feature allows the filter module 300 to be operated quickly and effectively when the support skeleton 310 needs to be repaired or replaced, reducing the difficulty and cost of maintenance. Since the detachable connection is easy to operate, it can greatly save time when the filter module 300 maintains and replaces the support skeleton 310. Moreover, the detachable connection allows the fast replacement of the faulty support skeleton 310, thereby reducing the time of water outage of the water system and improving the maintenance efficiency. Secondly, compared with the non-detachable connection, the detachable connection reduces the situation of overall scrapping of the parts due to the inability to disassemble, and reduces the waste of resources. Furthermore, the detachable connection allows the filter assembly 30 to be inspected and maintained regularly or irregularly to ensure its stability and safety, which helps to timely discover and solve potential safety hazards.

[0133] Further, in some possible connection modes, the two second ring parts 313 are clamped. It can be understood that when the second ring part 313 is made of plastic or metal, the clamping structure can be directly formed on the second ring part 313, and no additional locking accessories, such as screws, nuts, etc., are required during assembly, thereby reducing the manufacturing cost and assembly cost. Moreover, since the clamping structure is flexible in design, it can be customized according to the actual needs of the second ring part 313, reducing the waste of materials and improving the utilization rate of materials. Secondly, the clamping can achieve rapid assembly and disassembly without complex tools and equipment. This greatly improves the production efficiency and assembly efficiency, and also facilitates the maintenance and replacement of the filter module 300. Specifically, the clamping structure can be the cooperation of the hook and the hook groove, or the cooperation of the convex and the groove. Of course, in other embodiments, it can also be that the two second ring parts 313 are threadedly connected, and through the tight meshing of the threads, the connection between the two second ring parts 313 has a higher tensile and compressive strength, which can meet the use requirements under various working conditions. After assembly, the connection part is not easy to loosen, and a stable connection state can be maintained to ensure the normal operation of the filter module 300.

[0134] Optionally, in the same filter module 300, the end faces of the two second ring portions 313 abut against each other; it can be understood that in the same filter module 300, the two support skeletons 310 are connected by the two second ring portions 313, and the water passage cavity 340 is formed between the two support skeletons 310. By abutting the end faces of the two second ring portions 313, the two support skeletons 310 can be connected and the water passage cavity 340 can be sealed at the same time, which is beneficial to saving processing steps and improving production efficiency.

[0135] In an embodiment of the present invention, the first ring parts 312 of two adjacent filter modules 300 are detachably connected, and the specific method of detachably connecting the two first ring parts 312 can refer to the connection method of the two second ring parts 313. In this way, modular assembly between different filter modules 300 can be facilitated. Furthermore, the end faces of the first ring parts 312 of two adjacent filter modules 300 are abutted against each other, so that the connection of the first water outlets 330 of the two adjacent filter modules 300 can be achieved while achieving the connection of the two adjacent filter modules 300, thereby saving processing steps and improving production efficiency.

[0136] The present invention also proposes a water use system, which includes a pre-filter. The specific structure of the pre-filter refers to the above-mentioned embodiment. Since the water use system adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0137] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A pre-filter, characterized in that: include: The shell has a water filter cavity and a water inlet, a water outlet and a sewage outlet connected to the water filter cavity, the shell is provided with a water isolation ring between the water inlet and the water outlet, the water inlet is connected to the outer peripheral side of the water isolation ring, and the water outlet is connected to the inner peripheral side of the water isolation ring; as well as A filter assembly is movably disposed in the water filter cavity, so that the pre-filter can switch between a filter mode and a flushing mode. The filter assembly is hollow and comprises a first filter portion, a baffle portion, and a second filter portion which are sequentially distributed along the axial direction and are transmission-connected. The first filter portion is plugged into the water-isolating ring. In the filtering mode, at least the water isolating ring blocks the flushing flow path between the water inlet and the first filter part, and the filtering flow path between the water inlet and the second filter part is connected; In the flushing mode, the blocking portion blocks the filtering flow path between the water inlet and the second filter portion, and the flushing flow path between the water inlet and the first filter portion is connected.

2. The pre-filter according to claim 1, characterized in that: The filter assembly is axially movable, and the baffle is configured as an annular structure; In the filtering mode, the blocking portion abuts against the water isolation ring to block the flushing flow path between the water inlet and the first filtering portion; In the flushing mode, the baffle and the water-isolating ring are spaced apart in the axial direction, and the first filter portion is at least partially located between the baffle and the water-isolating ring to conduct the flushing flow path between the water inlet and the first filter portion.

3. The pre-filter according to claim 2, characterized in that: The pre-filter also includes an exoskeleton disposed in the water filter cavity, and the exoskeleton is sleeved on the filter assembly at intervals; In the filtering mode, the baffle is spaced apart from the shell and the outer frame to conduct the filtering flow path between the water inlet and the second filtering part; In the flushing mode, the blocking portion abuts against the outer frame to block the filtering flow path between the water inlet and the second filtering portion.

4. The pre-filter according to claim 3, characterized in that: In the flushing mode, the outer periphery of the baffle portion abuts against the inner periphery of the outer frame.

5. The pre-filter according to claim 4, characterized in that: The outer periphery of the baffle is sleeved with a sealing ring, which is sealed and matched with the outer frame through the sealing ring.

6. The pre-filter according to claim 2, characterized in that: The baffle is protrudingly arranged on the outer periphery of the filter assembly, and in the filtering mode, the baffle abuts against the end surface of the water isolation ring.

7. The pre-filter according to claim 2, characterized in that: The pre-filter also includes a water pressure drive disk arranged on the side of the filter assembly facing the sewage outlet, the filter assembly and the water pressure drive disk are both arranged between the water inlet and the sewage outlet, and the water inlet and the sewage outlet are arranged along the axial direction of the filter assembly.

8. The pre-filter according to claim 7, characterized in that: The pre-filter also includes an exoskeleton sleeved on the filter assembly, and a shift plate fixed to the exoskeleton, wherein the shift plate is arranged on a side of the hydraulic drive plate facing the sewage outlet; In the flushing mode, the water pressure driving disc abuts against the shift disc.

9. The pre-filter according to claim 8, characterized in that: The outer frame is provided with a drain port, and in the flushing mode, the two opposite sides of the water pressure driving disc and the shift disc are connected through the drain port.

10. The pre-filter according to claim 9, characterized in that: The outer peripheral side of the shift plate abuts against the inner peripheral wall of the outer frame, the drain port penetrates the peripheral wall of the outer frame opposite to the shift plate, and a drainage gap is formed between the drain port and the edges on both axial sides of the shift plate.

11. The pre-filter according to claim 8, characterized in that: The outer peripheral side of the shift plate abuts against the inner peripheral wall of the outer frame through a flexible ring.

12. The pre-filter according to claim 8, characterized in that: A third guide limit portion is provided on one side of the hydraulic drive disc facing the shift disc, and a guide limit hole is correspondingly provided on the shift disc. The third guide limit portion is inserted into the guide limit hole in an axially sliding manner along the filter assembly.

13. The pre-filter according to claim 12, characterized in that: The third guide limiting portion comprises a limiting column and a guiding rib connected to each other, wherein along the axial direction of the filter assembly, the length of the limiting column is greater than the length of the guiding rib, and the guiding rib extends along the circumferential direction of the filter assembly; The guide limiting hole comprises a first section and a second section which are connected in sequence, wherein the first section is for inserting the limiting column, and the second section is for inserting the guide rib.

14. The pre-filter according to claim 12, characterized in that: The end surface of the guide rib extends obliquely along the circumference of the filter assembly.

15. The pre-filter according to claim 8, characterized in that: The axis of the shift plate is provided with a positioning ring groove, and the inner ring of the positioning ring groove is installed with a positioning piece protruding toward the water pressure drive plate, the water pressure drive plate is provided with a positioning column protruding toward the shift plate, and the positioning column is provided with a positioning hole; In the flushing mode, the positioning column is inserted into the positioning ring groove, and the positioning member is inserted into the positioning hole.

16. The pre-filter according to claim 2, characterized in that: The pre-filter further comprises an elastic member, wherein the elastic member is connected to the filter assembly so that the filter assembly can be maintained at a position corresponding to the filter mode.

17. The pre-filter according to claim 16, characterized in that: The pre-filter also includes an outer frame which is sleeved on the filter assembly at intervals, and the elastic member is arranged between the baffle and the outer frame.

18. The pre-filter according to claim 17, characterized in that: The baffle is protruding from the outer periphery of the filter assembly, a step surface is formed on the inner periphery of the outer frame, the elastic member is sleeved on the filter assembly, and one end of the elastic member abuts against the baffle, and the other end abuts against the step surface.

19. The pre-filter according to claim 1, characterized in that: The first filter part is movably plugged into the water-isolating ring; and / or, The first filter part and the second filter part are respectively fixed on two opposite sides of the baffle part.

20. The pre-filter according to claim 1, characterized in that: The second filter portion includes a plurality of filter modules, a water passage cavity is formed inside the filter module, a first water passage and a second water passage are formed on the filter module which are connected to the water passage cavity, a filter element is provided at the second water passage, the filter element is arranged in an annular shape and has an inner ring edge and an outer ring edge, and the outer ring edge is located on one axial side of the inner ring edge, and the plurality of filter modules are connected in sequence along the axial direction.

21. The pre-filter according to claim 20, characterized in that: The filter module includes two support frames distributed along the axial direction, the water passage cavity is formed between the two support frames, each support frame is provided with a filter element, and the inner ring edges and the outer ring edges of two adjacent filter elements are distributed in opposite directions.

22. The pre-filter according to claim 21, characterized in that The support frame includes an oblique support portion, and the two ends of the oblique support portion are respectively connected to a first ring portion and a second ring portion, the two oblique support portions of the same filter module are connected through the second ring portion, the first water outlet is provided on the inner periphery of the first ring portion, and the second water outlet is provided on the oblique support portion.

23. The pre-filter according to claim 22, characterized in that The outer diameter of the second ring portion is greater than the outer diameter of the first ring portion.

24. The pre-filter according to claim 22, characterized in that: Each of the supporting frames is provided with the second ring portion, the two second ring portions of the same filter module are detachably connected, and the first ring portions of two adjacent filter modules are detachably connected.

25. A water system, characterized in that: Comprising a pre-filter as claimed in any one of claims 1 to 24.

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