Pre-filter and water system

Abstract

The utility model discloses a prefilter and a water consuming system, and relates to the technical field of filters, a shell of the prefilter 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, and the filtering assembly is hollow and comprises a first filtering part, a blocking part and a second filtering part which are sequentially distributed in the axial direction and are in transmission connection; 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 provided by the utility model, the filtering effect of the filtering assembly can be ensured, and the service life of the pre-filter is prolonged.

Description

Technical Field

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

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

[0003] The main purpose of the utility model is to provide a pre-filter and a water 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] 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 circumference of the water isolating ring, and the water outlet is connected to the inner circumference of the water isolating ring; and

[0006] A filter assembly is movably disposed in the water filter chamber, so that the pre-filter can switch between a filtering mode and a flushing mode. The filter assembly is hollow and includes a first filter portion, a baffle portion, and a second filter portion that are sequentially distributed along the axial direction and transmission-connected. The first filter portion is inserted 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 relative to the water separator ring so that the pre-filter can be switched between the filtering mode and the flushing mode.

[0010] In one embodiment, the pre-filter also includes an exoskeleton mounted on the filter assembly, the blocking portion is provided with a first guide limit portion, a second guide limit portion is provided between the water-isolating ring and the exoskeleton, the first guide limit portion is provided with a guide groove extending along the axial direction of the filter assembly, the second guide limit portion is at least partially passed through the guide groove, and the first guide limit portion can slide relative to the guide groove along the axial direction of the filter assembly.

[0011] In one embodiment, the first guide limiting portion has a limiting hook at one end away from the blocking portion, and the second guide limiting portion has a limiting step facing the limiting hook;

[0012] In the flushing mode, the limiting hook is hooked on the limiting step.

[0013] In one embodiment, one end of the second guide limiting portion is connected to the water-isolating ring, and the other end is connected to the outer frame.

[0014] In one embodiment, a positioning groove is further provided on the side of the water isolation ring facing the outer frame;

[0015] In the filtering mode, the first guide limiting portion is inserted into the positioning groove.

[0016] In one embodiment, the pre-filter also includes an exoskeleton spaced apart from the filter assembly, and the elastic member is disposed between the barrier portion and the exoskeleton. Under the action of the elastic member, the filter assembly can be maintained in a position corresponding to the filter mode.

[0017] In one embodiment, the shell is provided with an annular mounting portion communicating with the water outlet, and the water isolating ring is detachably mounted on the annular mounting portion.

[0018] In one embodiment, the water blocking ring is threadedly connected to the annular mounting portion; and / or,

[0019] An installation step is provided on the edge of the annular installation portion, and the end of the water isolation ring abuts against the installation step; and / or,

[0020] A sealing ring is provided between the water isolating ring and the annular mounting portion.

[0021] In one embodiment, the first filter portion and the second filter portion are respectively fixed on opposite sides of the barrier portion.

[0022] In one embodiment, the pre-filter further comprises an exoskeleton sleeved on the filter assembly, and an outer cleaning brush extending along the axial direction of the filter assembly is provided on the outer circumference of the exoskeleton.

[0023] 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 outlet and a second water flow outlet communicating with the water flow cavity, the second water flow outlet is provided with a filter element, the filter element is arranged in a ring 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.

[0024] In one embodiment, the filter module includes two support frames distributed along the axial direction, the water flow cavity is formed between the two support frames, each support frame is provided with the second water flow outlet, and the inner ring edge and the outer ring edge of the two adjacent filter elements are distributed in opposite directions.

[0025] In one embodiment, the support skeleton 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 inner periphery of the first ring portion is provided with the first water outlet, and the second water outlet is provided on the oblique support portion.

[0026] In one embodiment, the outer diameter of the second ring portion is greater than the outer diameter of the first ring portion.

[0027] In one embodiment, each of the support 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.

[0028] In one embodiment, the shell includes a filter bottle and a valve head distributed along a first direction, the water filter chamber is at least provided on the filter bottle, and the sewage outlet is provided on the side of the filter bottle away from the valve head, the water inlet and the water outlet are both provided on the valve head, the outer peripheral side of the filter bottle is provided with a first threaded section, and the inner peripheral side of the valve head is provided with a second threaded section, and the first threaded section and the second threaded section are threadedly connected.

[0029] In one embodiment, the sealing structure is further provided between the filter bottle and the valve head, and the sealing structure includes a first sealing ring and a second sealing ring respectively provided on opposite sides of the first threaded section, the axial sides of the first sealing ring respectively abut against the filter bottle and the valve head, and the outer peripheral side and inner peripheral side of the second sealing ring respectively abut against the filter bottle and the valve head.

[0030] In one embodiment, a sealing edge is provided on the outer circumference of the filter bottle, the first sealing ring is provided on the sealing edge, and the end of the valve head abuts against the first sealing ring on the sealing edge.

[0031] The utility model also provides a water use system, comprising the pre-filter as described above.

[0032] The technical solution of the present invention is to provide a water filter chamber and a water inlet and a water outlet connected to the water filter chamber in the shell. 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 chamber 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 distributed along the axial direction and connected by transmission. The first filter part is inserted 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.

[0033] 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; after the raw water enters from the water inlet, it flows directly to the second filter part for filtration, and flows from outside to 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; 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 inside to outside along the radial direction of the second filter part to flush the filter component, and finally flows to the sewage outlet.

[0034] Therefore, in this solution, a water-isolating ring and a barrier portion are arranged in the water filter chamber, and the barrier portion is located between the first filter portion and the second filter portion. The barrier portion can move relative to the water-isolating ring with the first filter portion and the second filter portion, thereby controlling the conduction and isolation of the water inlet with the first filter portion and the second filter portion respectively, thereby controlling the pre-filter to switch between the filtering mode and the flushing mode, realizing self-flushing of the internal filter 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

[0035] 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.

[0036] Figure 1 A schematic structural diagram of an embodiment of a pre-filter provided by the present utility model;

[0037] Figure 2for Figure 1 Schematic diagram of the structure of the middle valve head;

[0038] Figure 3 for Figure 1 Schematic diagram of the structure of the middle filter bottle;

[0039] Figure 4 for Figure 1 Cross-sectional view of the pre-filter in filtering mode;

[0040] Figure 5 for Figure 1 Cross-sectional view of the pre-filter in flushing mode;

[0041] Figure 6 for Figure 5 A partial enlarged view of point A in the middle;

[0042] Figure 7 for Figure 1 Schematic diagram of the assembly structure of the filter component and the exoskeleton in the filtering mode;

[0043] Figure 8 for Figure 7 A partial enlarged view of point B in the middle;

[0044] Figure 9 for Figure 1 Schematic diagram of the assembly structure of the filter component and the exoskeleton in the flushing mode;

[0045] Figure 10 for Figure 9 A partial enlarged view of point C in the middle;

[0046] Figure 11 for Figure 1 A cross-sectional view of the assembly structure of the filter assembly and the outer skeleton;

[0047] Figure 12 for Figure 1 Schematic diagram of the meso-exo-skeleton structure;

[0048] Figure 13 for Figure 1 Schematic diagram of the structure of the filtering module;

[0049] Figure 14 for Figure 1 Exploded view of the filtering module.

[0050] Description of Figure Numbers:

[0051] 10. Filter bottle; 101. Water filter chamber; 102. Sewage outlet; 103. First threaded section; 104. First sealing ring; 105. Second sealing ring; 106. Sealing edge; 107. Reinforcement rib;

[0052] 20. Valve head; 201. Water inlet; 202. Water outlet; 203. Water isolation ring; 2031. Positioning groove; 204. Annular mounting portion; 2041. Mounting step; 205. Sealing ring; 206. Second threaded section;

[0053] 30. Filter assembly; 301. First filter portion; 302. Second filter portion; 303. Blocking portion; 3032. First guide limiting portion; 3033. Guide groove; 3034. Limiting hook;

[0054] 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 chamber; 350, second water outlet;

[0055] 50. External frame; 540. Second guide limiter; 541. Limiting step; 550. External cleaning brush;

[0056] 740. Elastic parts.

[0057] 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

[0058] 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.

[0059] 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.

[0060] 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.

[0061] The present invention proposes a pre-filter, the interior of which can realize the switching of the internal flow channel, so that the filter component 30 inside it can be cleaned regularly to discharge the large particulate matter previously intercepted, thereby eliminating the need for manual disassembly and cleaning of the pre-filter, thereby increasing the service life of the pre-filter.

[0062] Water systems, such as whole-house water purification systems, typically feature a pre-filter to filter out large particles from tap water. This not only ensures water safety but also extends the life of appliances, prevents clogged household water pipes, and improves residents' health. The pre-filter is the first coarse filtration device in a whole-house water purification system. It is a physical filter that primarily intercepts large particles larger than 40 microns, ensuring back-end water safety.

[0063] See also Figure 1 、 Figure 4 and Figure 5 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, and the shell is provided with a water isolation ring 203 between the water inlet 201 and the water outlet 202, the water inlet 201 is connected to the outer peripheral side of the water isolation ring 203, and the water outlet 202 is connected to the inner peripheral side of the water isolation ring 203.

[0064] The water inlet 201 is connected to the water supply end of the water supply system, and the water outlet 202 is connected to the water consumption end of the water supply system, thereby filtering the raw water flowing from the water supply end to the water consumption end. It should be noted that the water supply end can be a tap, water tower, or well water, and the water consumption end can be a faucet, shower, or drinking water outlet, which is not specifically limited in this application.

[0065] The pre-filter also includes a filter assembly 30 disposed within the water filter chamber 101. After raw water (e.g., tap water or well water) flows from an external water source into the water inlet 201, it can flow through the filter assembly 30 for filtration. The filter assembly 30 can intercept large particles of impurities in the water and remove some precipitated impurities, rust, sand, mud, bacteria, and other particulate impurities generated in the pipeline. This provides better protection for water purifiers, washing machines, showers, high-end faucets, downstream pipelines, etc., reducing the risk of damage to these devices due to impurity blockage. The form and structure of the filter assembly 30 are not limited, and the filter assembly 30 can be a stainless steel filter or a PP cotton filter.

[0066] 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 being set 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 a sewage valve is used to control its opening and closing.

[0067] The filter assembly 30 is movably disposed within the water filter chamber 101, enabling the pre-filter to switch between a filtering mode and a 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 distributed along the axial direction and transmission-connected. The first filter portion 301 is inserted into the water isolation ring 203.

[0068] In the filtering mode, the water isolation ring 203 and the baffle 303 together block the flushing flow path between the water inlet 201 and the first filter part 301, while the filtering flow path between the water inlet 201 and the second filter part 302 is open;

[0069] 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.

[0070] Specifically, the filter assembly 30 is disposed within the water filter chamber 101 and is hollow, thereby allowing the water flow inside and outside the filter assembly 30 to continuously exchange, thereby filtering the raw water or cleaning the filter assembly 30. Therefore, in this embodiment, the filter assembly 30 includes a first filter portion 301 and a second filter portion 302 that are distributed along the axial direction and are transmission-connected, so that the first filter portion 301 and the second filter portion 302 can move together within the water filter chamber 101. The movement of the filter assembly 30 changes the communication relationship between the filter assembly 30 and the water inlet 201, thereby changing the direction of water flow, so that the pre-filter can switch between the filtering mode and the flushing mode.

[0071] In filter mode (see Figure 4), 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 the water inlet 201, it flows directly 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 5 ), 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.

[0072] Therefore, in this solution, a water-isolating ring 203 and a barrier portion 303 are provided in the water filter chamber 101, and the barrier portion 303 is located between the first filter portion 301 and the second filter portion 302. The barrier portion 303 can move relative to the water-isolating ring 203 with the first filter portion 301 and the second filter portion 302, thereby controlling the conduction and isolation of the water inlet 201 and the first filter portion 301 and the second filter portion 302 respectively, thereby controlling the switching of the pre-filter between the filtering mode and the flushing mode, realizing the self-flushing of the internal filter component 30 of the pre-filter, facilitating the cleaning of the pre-filter, and thereby improving the service life of the pre-filter.

[0073] Among them, the first filter part 301 can be movably inserted into the water-isolating ring 203, 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, thereby scraping off impurities accumulated on the periphery of the first filter part 301, thereby reducing the possibility of impurities clogging the first filter part 301.

[0074] 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 on opposite sides of the barrier part 303. At this time, the three can be formed as one piece, or installed by bonding or clamping.

[0075] See also Figure 4 and Figure 5, the filter assembly 30 can move axially relative to the water-isolating ring 203 so that the pre-filter switches between the filtering mode and the flushing mode. In the filtering 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 realizes the switching between the filtering 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 filtering mode (refer to Figure 4 ), so that the first filter part 301 is completely inserted into the water-isolating ring 203, so that the outer peripheral side of the first filter part 301 is blocked, thereby preventing the raw water of the water filter chamber 101 from directly flowing into the inner periphery of the first filter part 301. However, the raw water of 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 205 can also be provided on the side of the first filter part 301 close to the baffle part 303. In the filtering mode, the sealing ring 205 is sealed and abutted between the first filter part 301 and the water-isolating ring 203.

[0076] The pre-filter also includes an exoskeleton 50 that is sleeved onto the filter assembly 30. The exoskeleton 50 is sleeved around the 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 exoskeleton 50 is sleeved onto the filter assembly 30 at intervals, thereby providing a certain water flow gap between the exoskeleton 50 and the second filter section 302. This ensures that in the filtration mode, the baffle 303 is spaced apart from the housing and the exoskeleton 50. Raw water flows into the second filter section 302 through the water flow gap between the exoskeleton 50 and the second filter section 302, thereby conducting the filtration flow path between the water inlet 201 and the second filter section 302.

[0077] To switch the pre-filter from filtering mode to flushing mode, in flushing mode (refer to Figure 5 ), the baffle 303 and the water-isolating ring 203 are spaced apart in the axial direction, allowing at least a portion of the second filter portion 302 to leak out from between the baffle 303 and the water-isolating ring 203, thereby releasing the blockage of the outer circumference of the first filter portion 301 by the water-isolating ring 203 and the baffle 303, thereby allowing the flushing flow path between the water inlet 201 and the first filter portion 301 to be conductive. At the same time, the baffle 303 at least abuts against the outer frame 50, thereby blocking the water-passing gap between the outer frame 50 and the second filter portion 302, thereby isolating the filtration flow path between the water inlet 201 and the second filter portion 302.

[0078] Typically, the exoskeleton 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 portion 302 through the pores of the exoskeleton 50 itself, a sealing structure is provided between the baffle 303 and the exoskeleton 50, or the exoskeleton 50 is configured as a circumferentially sealed structure. In this embodiment, the exoskeleton 50 remains stationary within the water filtration chamber 101. In other embodiments, the exoskeleton 50 may rotate within the water filtration chamber 101.

[0079] 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, placing the pre-filter in filtering mode; the pre-filter switches from filtering mode to 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 circumferential rotation of the filter assembly 30 to achieve switching between filtering mode and flushing mode. At this time, the first filter portion 301 and the second filter portion are partially circumferentially connected, and the switching between filtering mode and flushing mode is achieved by circumferential misalignment of the connection position.

[0080] See also Figures 7 to 10 In an embodiment of the present utility model, the blocking portion 303 is provided with a first guide limit portion 3032, and a second guide limit portion 540 is provided between the water-blocking ring 203 and the outer skeleton 50. The first guide limit portion 3032 is provided with a guide groove 3033 extending along the axial direction of the filter component 30, and the second guide limit portion 540 is at least partially penetrated by the guide groove 3033, and the first guide limit portion 3032 can slide relative to the guide groove 3033 along the axial direction of the filter component 30.

[0081] Specifically, the first guide limiter 3032 is provided on the baffle 303, and because the first filter 301 is plugged into the water-isolating ring 203, the first guide limiter 3032 is correspondingly provided on the outer circumference of the water-isolating ring 203, thereby jointly limiting and guiding the water-isolating ring 203 with the first filter 301, thereby improving the stability of the cooperation between the first filter 301 and the water-isolating ring 203. The second guide limiter 540 is correspondingly provided between the water-isolating ring 203 and the outer frame 50, and the first guide limiter 3032 is provided with a guide groove 3033 extending along the axial direction of the filter assembly 30. The second guide limiter 540 is at least partially provided in the guide groove 3033, so that the filter assembly 30 can drive the guide groove 3033 to slide relative to the first guide limiter 3032, so that the two cooperate with each other to guide the movement of the filter assembly 30.

[0082] The first guide stopper 3032 may include two parts symmetrically spaced apart along the circumference of the filter assembly 30, with the gap between the two parts forming the guide groove 3033, thereby facilitating the processing and forming of the first guide stopper 3032. The first guide stopper 3032 is fixedly disposed relative to the water isolation ring 203 and the outer frame 50.

[0083] See also Figures 7 to 10 and Figure 12 In an embodiment of the present utility model, one end of the second guide limiter 540 is connected to the water-blocking ring 203, and the other end is connected to the exoskeleton 50. In this embodiment, the exoskeleton 50 remains roughly stationary in the pre-filter. Therefore, in order to ensure the stability of the exoskeleton 50 and facilitate the overall assembly of the pre-filter, the water-blocking ring 203 and the exoskeleton 50 are connected together through the second guide limiter 540. Therefore, the second guide limiter 540, the water-blocking ring 203 and the exoskeleton 50 can be formed as one piece, thereby ensuring the stable installation of the three and facilitating the assembly of the pre-filter. In other embodiments, the second guide limiter 540, the water-blocking ring 203 and the exoskeleton 50 can also be connected together by bonding, clamping or fasteners.

[0084] In an embodiment of the present invention, when the filter assembly 30 switches between the filtering mode and the flushing mode through axial movement, the first guide limiting portion 3032 has a limiting hook 3034 at one end away from the blocking portion 303, and the second guide limiting portion 540 is provided with a limiting step 541 facing the limiting hook 3034; in the flushing mode, the limiting hook 3034 is hooked on the limiting step 541. Specifically, in the flushing mode, the filter assembly 30 moves toward the direction close to the sewage outlet 102, but in the actual working process, the filter assembly 30 may move excessively, causing the first filter part 301 to separate from the water-isolating ring 203, thereby affecting the stability of the filter assembly 30. Therefore, the first guide limit part 3032 has a limit hook 3034 at the end away from the blocking part 303, and the second guide limit part 540 is provided with a limit step 541 facing the limit hook 3034. In the flushing mode, the limit hook 3034 is hooked on the limit step 541, thereby limiting the movement of the filter assembly 30 and reducing the possibility of the first filter part 301 separating from the water-isolating ring 203.

[0085] Furthermore, a positioning groove 2031 is provided on the side of the water barrier ring 203 facing the outer frame 50; in filtering mode, the first guide stop 3032 is inserted into the positioning groove 2031. Specifically, in filtering mode, the first filter unit 301 is inserted into the water barrier ring 203. To reduce the possibility of displacement of the filter assembly 30 relative to the water barrier ring 203, the positioning groove 2031 is provided on the side of the water barrier ring 203 facing the outer frame 50; in filtering mode, the first guide stop 3032 is inserted into the positioning groove 2031, thereby circumferentially positioning the filter assembly 30.

[0086] See also Figure 4 、 Figure 5 、 Figure 7 and Figure 9 In one embodiment, the pre-filter further includes an exoskeleton 50 spaced apart from the filter assembly 30, and an elastic member 740 is disposed between the baffle 303 and the exoskeleton 50. Under the action of the elastic member 740, the filter assembly 30 can be maintained in a position corresponding to the filtration mode. That is, the elastic member 740 can maintain the filter assembly 30 in the first position. When the sewage outlet 102 is closed, the water pressure within the water filter chamber 101 is released, and the elastic member 740 causes 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, thereby simplifying the internal structure of the pre-filter. Furthermore, the elastic member 740 is disposed between the baffle 303 and the exoskeleton 50, thereby facilitating the installation of the elastic member 740. In other embodiments, the elastic member 740 can also be disposed between the baffle 303 and the water isolation ring 203, or between the baffle 303 and the housing.

[0087] The elastic member 740 can be configured as a spring, which not only facilitates installation of the elastic member 740 but also reduces interference with the water flow within the water filter chamber 101 due to the elasticity. In other embodiments, the elastic member 740 can also be configured as an elastic block or elastic sleeve. In this case, the elastic member 740 is provided with a clearance space for the water flow to pass through. If the filter assembly 30 switches 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 switches 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. If the elastic member 740 is positioned between the baffle 303 and the exoskeleton 50, it can be configured as a compression spring. If the elastic member 740 is positioned between the baffle 303 and the water barrier ring 203, it can be configured as a tension spring.

[0088] See also Figure 12 In an embodiment of the present invention, the pre-filter further comprises an exoskeleton 50 that is sleeved over the filter assembly 30. An external cleaning brush 550 is disposed on the outer periphery of the exoskeleton 50 and extends axially along the filter assembly 30. Specifically, the external cleaning brush 550 is disposed on the outer periphery of the exoskeleton 50 and faces the wall of the water filter chamber 101, thereby cleaning the inner surface of the water filter chamber 101. This reduces the possibility of impurities adhering to the surface of the water filter chamber 101 and causing bacterial growth within the pre-filter, thereby ensuring the service life of the pre-filter. Furthermore, the external cleaning brush 550 extends axially along the filter assembly 30, further increasing its cleaning area.

[0089] The side of the external cleaning brush 550 away from the external frame 50 can be pressed against the inner surface of the water filter chamber 101. As the external frame 50 rotates within the water filter chamber 101, the external cleaning brush 550 scrapes away impurities on the surface of the water filter chamber 101. Since the external frame 50 remains stationary during operation of the pre-filter, when the inner wall of the water filter chamber 101 needs to be cleaned, the valve head 20 can be removed and the inner wall of the water filter chamber 101 can be cleaned by rotating the external frame 50.

[0090] See also Figure 11 、 Figure 13 and Figure 14 In this embodiment, the filter assembly 30 includes multiple filter modules 300. Each filter module 300 defines a water passage cavity 340. Each filter module 300 includes a first water passage 330 and a second water passage 350 connected to the water passage cavity 340. The second water passage 350 is provided with a filter element 320. The filter element 320 is annular and has an inner ring edge 321 and an outer ring edge 322, with the outer ring edge 322 located axially to one side of the inner ring edge 321. The multiple filter modules 300 are sequentially connected along the axial direction. The term "multiple" refers to more than two. 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 sequentially distributed along the upstream and downstream directions. 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.

[0091] 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 the 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 the 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 conditions of the same height, the filtration area of ​​the filter element 320 can be increased, which means that under the same flow rate, the filter element 320 of this solution can withstand a larger flow load and improve the filtration efficiency. Moreover, since the filtration area of ​​the filter element 320 of this solution 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 larger flow load, which helps to extend the service life of the filter module 300, reduce the replacement frequency, and thus reduce maintenance costs.

[0092] Furthermore, the outer side surface of the filter element 320 is configured as a conical surface. The conical surface design facilitates uniform distribution and smooth flow of the fluid, reduces eddy currents and turbulence within 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 be a concave arc that is concave toward the inside of the water chamber 340, or the generatrix of the conical surface can be a convex arc that is convex toward the outside of the water chamber 340. In other embodiments, the outer side surface of the filter element 320 can also be a pyramidal surface with a polygonal cross-section, thereby increasing the filtration area of ​​the filter element 320.

[0093] In this novel embodiment, the filter module 300 includes two axially spaced support frames 310, with a water passage chamber 340 formed between the two support frames 310. Each support frame 310 is equipped with a filter element 320, with the inner annular edges 321 and outer annular edges 322 of adjacent filter elements 320 oriented in opposite directions. It can be understood that, given a given radial space within the water filter chamber 101, having the two filter elements 320 of the same filter module 300 tapered in opposite directions can achieve a larger filtration area than a filter module 300 that maintains a tapered shape in one direction. This embodiment fully utilizes the space within the water filter chamber 101, creating a larger filtration area around the filter module 300, ensuring that the filter assembly 30 can withstand a greater flow load and improving filtration efficiency. Furthermore, the two support frames 310 provide a sufficiently large water passage chamber 340 to facilitate water flow. 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 .

[0094] In this embodiment, the support frame 310 includes an oblique support portion 311, with a first ring portion 312 and a second ring portion 313 connected to each end of the oblique support portion 311. The two oblique support portions 311 of the same filter module 300 are connected by the second ring portion 313. The first water outlet 330 is provided on the inner periphery of the first ring portion 312, and the second water outlet 350 is provided on the oblique support portion 311. This ensures the structural strength of the support frame 310 and the connection strength between the two support frames 310, thereby maintaining the filtration capacity of the filter assembly 30. Of course, in other embodiments, the support frame 310 can also be configured as other structural forms.

[0095] 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 inclined support portion 311 can provide sufficient support to the filter element 320, and the total flow area of ​​the second water outlet 350 is large, so that the filter module 300 has sufficient flow capacity.

[0096] 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, and 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 outer 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.

[0097] Without loss of generality, the outer diameter of the second ring portion 313 is larger than the outer diameter of the first ring portion 312. Thus, each filter element 320 alternately tapers in the upper and lower directions, making fuller use of the space within the water filter cavity 101 to provide a larger filtration area, thereby further improving the filtration efficiency of the filter assembly 30. Of course, in other embodiments, the outer diameter of the first ring portion 312 may be larger than the outer diameter of the second ring portion 313, or there may be no fixed size relationship between the diameters of the first ring portion 312 and the second ring portion 313.

[0098] In this embodiment, each support frame 310 is provided with a second ring portion 313, and the two second ring portions 313 of the same filter module 300 are detachably connected. As will be appreciated, this detachable connection allows for easy separation of components without damaging the connector itself or adjacent components. This feature allows for quick and efficient repairs or replacement of the support frame 310 of the filter module 300, reducing maintenance effort and costs. The ease of detachable connection significantly saves time when maintaining or replacing the support frame 310 of the filter module 300. Furthermore, the detachable connection allows for quick replacement of faulty support frames 310, thereby reducing water system outages and improving maintenance efficiency. Furthermore, compared to non-detachable connections, detachable connections reduce the likelihood of entire components being scrapped due to inability to disassemble, thus reducing resource waste. Furthermore, the detachable connection allows for regular or irregular inspection and maintenance of the filter assembly 300 to ensure its stability and safety, helping to promptly identify and address potential safety hazards.

[0099] Furthermore, in some possible connection methods, the two second ring portions 313 are snap-fitted. It is understood that when the second ring portions 313 are made of plastic or metal, the snap-fit ​​structure can be molded directly onto the second ring portions 313, eliminating the need for additional fastening components such as screws or nuts during assembly, thereby reducing manufacturing and assembly costs. Furthermore, due to the flexible design of the snap-fit ​​structure, it can be customized to the actual needs of the second ring portion 313, reducing material waste and improving material utilization. Furthermore, the snap-fit ​​connection allows for rapid assembly and disassembly without the need for complex tools and equipment. This significantly improves production and assembly efficiency, while also facilitating maintenance and replacement of the filter module 300. Specifically, the snap-fit ​​structure can be a combination of a hook and a groove, or a protrusion and a groove. Of course, in other embodiments, the two second ring portions 313 can also be threadedly connected. The tight engagement of the threads provides the connection between the two second ring portions 313 with high tensile and compressive strength, meeting the requirements of various operating conditions. After assembly, the connection is less likely to loosen, maintaining a stable connection and ensuring the proper operation of the filter module 300.

[0100] 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 frames 310 are connected by the two second ring portions 313, and the water flow cavity 340 is formed between the two support frames 310. By abutting the end faces of the two second ring portions 313, the two support frames 310 can be connected while the water flow cavity 340 is sealed, which is beneficial to saving processing steps and improving production efficiency.

[0101] In this embodiment, the first ring portions 312 of two adjacent filter modules 300 are detachably connected. The specific method for detachably connecting the two first ring portions 312 can be referenced to the connection method of the two second ring portions 313. This facilitates modular assembly of different filter modules 300. Furthermore, the end faces of the first ring portions 312 of two adjacent filter modules 300 abut against each other, allowing the connection of the two adjacent filter modules 300 while also ensuring communication between their first water outlets 330. This saves processing steps and improves production efficiency.

[0102] See also Figures 1 to 6In an embodiment of the present invention, the housing includes a filter bottle 10 and a valve head 20 distributed along a first direction. A water filtration chamber 101 is provided at least in the filter bottle 10, and a sewage outlet 102 is provided on a side of the filter bottle 10 away from the valve head 20. A water inlet 201 and a water outlet 202 are both provided in the valve head 20. A first threaded section 103 is provided on the outer circumference of the filter bottle 10, and a second threaded section 206 is provided on the inner circumference of the valve head 20. The first threaded section 103 and the second threaded section 206 are threadedly connected. Specifically, the housing includes the filter bottle 10 and the valve head 20 connected to the filter bottle 10. The water filtration chamber 101 is provided at least in the filter bottle 10. That is, the water filtration chamber 101 can be provided only in the filter bottle 10, or the filter bottle 10 and the valve head 20 can jointly form the water filtration chamber 101. A sewage outlet 102 is provided on the side of the filter bottle 10 away from the valve head 20. The sewage outlet 102 can be provided directly on the filter bottle 10, or a through hole communicating with the sewage outlet 102 can be provided on the side of the filter bottle 10 away from the valve head 20. The water inlet 201 and the water outlet 202 are both provided on the valve head 20. The water isolation ring 203 is located at least on the inner side of the valve head 20. The water inlet 201 is connected to the outer circumference of the water isolation ring 203, and the water outlet 202 is connected to the inner circumference of the water isolation ring 203, thereby separating the water inlet 201 and the water outlet 202, and facilitating control of the communication between the water inlet 201 and the water outlet 202.

[0103] A first threaded segment 103 is provided on the outer circumference of the filter bottle 10, and a second threaded segment 206 is provided on the inner circumference of the valve head 20. The first threaded segment 103 and the second threaded segment 206 are threadedly connected, that is, the connection method between the valve head 20 and the filter bottle 10 is mainly 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 threading the external threaded tube.

[0104] The valve head 20 can be made of metal, and to reduce the possibility of rust, the metal can be covered with a plastic protective shell. In other embodiments, the valve head 20 can also be made of a metal outer shell and a plastic inner lining, which is not specifically limited in this application. For example, the metal material can be a copper alloy such as brass, and the plastic material can be PP (polypropylene) or PVC (polyvinyl chloride).

[0105] The valve head 20 and filter bottle 10 of existing prefilters typically only provide a radial seal at one point. This sealing method has low reliability, high radial dimensions for the valve head 20 and filter bottle 10, and a small area for the sealing ring 205, making it prone to water leakage. Therefore, in an embodiment of the present invention, a sealing structure is provided between the filter bottle 10 and the valve head 20. The sealing structure includes a first sealing ring 104 and a second sealing ring 105, disposed on opposite sides of the first threaded segment 103. The first sealing ring 104 abuts the filter bottle 10 and the valve head 20 on both axial sides, respectively, while the second sealing ring 105 abuts the filter bottle 10 and the valve head 20 on its outer and inner sides, respectively. In this way, the first sealing ring 104 provides an axial seal, while the second sealing ring 105 provides a radial seal. Through their complementary interaction, the airtightness of the prefilter can be improved and the risk of water leakage can be reduced. Of course, in other embodiments, the second sealing ring 105 may be omitted, and two or more first sealing rings 104 may be provided.

[0106] Optionally, the filter bottle 10 and the valve head 20 are butted together along the axial direction of the first sealing ring 104 (i.e., the first direction), and the first sealing ring 104 is disposed at the junction between the filter bottle 10 and the valve head 20. In this manner, the first sealing ring 104 is clamped and secured by the butting process, resulting in a simple and easy-to-implement structure. Of course, in other embodiments, the first sealing ring 104 may be clamped at other locations.

[0107] In an embodiment of the present invention, a sealing edge 106 is provided on the outer periphery of the filter bottle 10. A first sealing ring 104 is disposed on the sealing edge 106, and the end of the valve head 20 abuts the first sealing ring 104 against the sealing edge 106. The first sealing ring 104 is disposed on the sealing edge 106, thereby facilitating its installation and ensuring the sealing stability of the first sealing ring 104. Furthermore, the sealing edge 106 further abuts the valve head 20, further extending the water flow path and improving the airtightness of the pre-filter. To ensure the structural strength of the sealing edge 106, in one embodiment, a reinforcing rib 107 may be provided at the connection between the sealing edge 106 and the filter bottle 10.

[0108] Since the valve head 20 can be made of metal material, the water-isolating ring 203 can be installed on the valve head 20 in the form of a snap-on or threaded connection. In one embodiment, the shell is provided with an annular mounting portion 204 connected to the water outlet 202, and the water-isolating ring 203 can be detachably installed on the annular mounting portion 204. Specifically, since the water-isolating ring 203 is connected to the outer frame 50, the water-isolating ring 203 can be detachably installed on the annular mounting portion 204. During actual assembly, the filter assembly 30 can be assembled between the outer frame 50 and the water-isolating ring 203, and then the whole assembly can be assembled on the mounting portion, and then the assembly of the valve head 20 and the filter bottle 10 can be completed, thereby facilitating the assembly of the pre-filter. However, the assembly method of the pre-filter in this solution is not limited to this, and the water-isolating ring 203 can also be installed on the annular mounting portion 204, and then the filter assembly 30 can be assembled.

[0109] To facilitate the assembly of the water isolation ring 203, in an embodiment of the present invention, the water isolation ring 203 is threadedly connected to the annular mounting portion 204. In other embodiments, the water isolation ring 203 can also be installed on the annular mounting portion 204 by means of a snap connection or the like.

[0110] Because the inner circumference of the water isolation ring 203 is connected to the water outlet 202, it is preferred that a certain gap be left between the water isolation ring 203 and the housing to allow for connection to the water outlet 202. To facilitate positioning of the water isolation ring 203, in one embodiment, a mounting step 2041 is provided on the edge of the annular mounting portion 204, with the end of the water isolation ring 203 abutting against the mounting step 2041. The mounting step 2041 serves to limit the installation of the annular mounting portion 204, thereby reducing the possibility of over-installation between the water isolation ring 203 and the annular mounting portion 204, which could result in the inner circumference of the water outlet 202 being blocked.

[0111] In order to reduce water leakage between the water isolation ring 203 and the annular mounting portion 204, in an embodiment of the present invention, a sealing ring 205 is provided between the water isolation ring 203 and the annular mounting portion 204 to reduce water seepage and cause water flow turbulence.

[0112] The present utility model 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.

[0113] The above are merely exemplary embodiments of the present invention and are not intended to limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A pre-filter, characterized in that: include: The shell has a water filter cavity and a water inlet, 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 chamber, so that the pre-filter can switch between a filtering mode and a flushing mode. The filter assembly is hollow and includes a first filter portion, a baffle portion, and a second filter portion that are sequentially distributed along the axial direction and transmission-connected. The first filter portion is inserted 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 prefilter according to claim 1, wherein The filter assembly can move axially relative to the water isolation ring to switch the pre-filter between the filtering mode and the flushing mode.

3. The prefilter according to claim 2, wherein: The pre-filter also includes an exoskeleton mounted on the filter assembly, the blocking portion is provided with a first guide limit portion, a second guide limit portion is provided between the water-isolating ring and the exoskeleton, the first guide limit portion is provided with a guide groove extending along the axial direction of the filter assembly, the second guide limit portion is at least partially passed through the guide groove, and the first guide limit portion can slide relative to the guide groove along the axial direction of the filter assembly.

4. The prefilter according to claim 3, characterized in that The first guide limiting portion has a limiting hook at one end away from the blocking portion, and the second guide limiting portion is provided with a limiting step facing the limiting hook; In the flushing mode, the limiting hook is hooked on the limiting step.

5. The pre-filter according to claim 3, characterized in that: One end of the second guide limiting portion is connected to the water-isolating ring, and the other end is connected to the outer frame.

6. The prefilter according to claim 3, characterized in that The side of the water-isolating ring facing the outer frame is also provided with a positioning groove; In the filtering mode, the first guide limiting portion is inserted into the positioning groove.

7. The prefilter according to claim 2, wherein: The pre-filter also includes an outer frame that is spaced apart and sleeved on the filter assembly, and an elastic member is provided between the barrier portion and the outer frame. Under the action of the elastic member, the filter assembly can be maintained at a position corresponding to the filter mode.

8. The prefilter according to claim 1, wherein: The shell is provided with an annular mounting portion communicating with the water outlet, and the water isolating ring is detachably mounted on the annular mounting portion.

9. The prefilter according to claim 8, characterized in that The water-blocking ring is threadedly connected to the annular mounting portion; and / or, An installation step is provided on the edge of the annular installation portion, and the end of the water isolation ring abuts against the installation step; and / or, A sealing ring is provided between the water isolating ring and the annular mounting portion.

10. The pre-filter according to claim 1, wherein: The first filter portion and the second filter portion are respectively fixed on two opposite sides of the barrier portion.

11. The prefilter according to claim 1, wherein The pre-filter further comprises an exoskeleton sleeved on the filter assembly, and an outer cleaning brush extending along the axial direction of the filter assembly is provided on the outer circumference of the exoskeleton.

12. The pre-filter according to claim 1, wherein The second filter portion includes a plurality of filter modules, a water flow cavity is formed inside the filter module, a first water flow outlet and a second water flow outlet are formed on the filter module to communicate with the water flow cavity, the second water flow outlet is provided with a filter element, the filter element is arranged in a ring 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.

13. The pre-filter according to claim 12, wherein: The filter module includes two support frames distributed along the axial direction, the water flow cavity is formed between the two support frames, each support frame is provided with the second water flow port, and the inner ring edge and the outer ring edge of two adjacent filter elements are distributed in opposite directions.

14. The pre-filter according to claim 13, wherein: 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 inner periphery of the first ring portion is provided with the first water outlet, and the second water outlet is provided on the oblique support portion.

15. The pre-filter according to claim 14, characterized in that The outer diameter of the second ring portion is greater than the outer diameter of the first ring portion.

16. The pre-filter according to claim 14, wherein: Each of the support 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.

17. The prefilter according to any one of claims 1 to 16, characterized in that The shell includes a filter bottle and a valve head distributed along a first direction, the water filter chamber is at least provided in the filter bottle, and the sewage outlet is provided on the side of the filter bottle away from the valve head, the water inlet and the water outlet are both provided on the valve head, the outer peripheral side of the filter bottle is provided with a first threaded section, and the inner peripheral side of the valve head is provided with a second threaded section, and the first threaded section and the second threaded section are threadedly connected.

18. The pre-filter according to claim 17, wherein: A sealing structure is also provided between the filter bottle and the valve head, and the sealing structure includes a first sealing ring and a second sealing ring respectively provided on opposite sides of the first threaded section. The axial sides of the first sealing ring respectively abut against the filter bottle and the valve head, and the outer circumference and inner circumference of the second sealing ring respectively abut against the filter bottle and the valve head.

19. The pre-filter according to claim 18, wherein A sealing edge is provided on the outer circumference of the filter bottle, the first sealing ring is provided on the sealing edge, and the end of the valve head abuts against the first sealing ring on the sealing edge.

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

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