Pre-filter and water system

Abstract

The utility model discloses a prefilter and water consuming system relates to prefilter technical field, wherein prefilter includes filter flask and valve head, filter flask is provided with filter cavity, the valve head is provided with water inlet and water outlet, the water inlet and the water outlet pass through the filter cavity intercommunication, the filter flask is provided with the filter cavity, the valve head is provided with the water inlet and the water outlet, the filter flask is provided with the filter cavity, and the valve head is provided with the water inlet and the water outlet. The valve head and the filter bottle are riveted and fixed; according to the technical scheme provided by the utility model, the valve head and the filter bottle are reliably assembled, so that the working performance of the pre-filter is guaranteed.

Description

Technical Field

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

[0002] During the production process of the pre-filter, the valve head and filter bottle need to be reliably assembled to ensure the working performance of the pre-filter. Utility Model Content

[0003] The main purpose of the utility model is to provide a pre-filter and a water system, aiming to reliably assemble the valve head and the filter bottle to ensure the working performance of the pre-filter.

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

[0005] A filter bottle, wherein the filter bottle is provided with a water filtration chamber; and

[0006] A valve head is provided with a water inlet and a water outlet, the water inlet and the water outlet are communicated with each other through the water filter cavity, and the valve head and the filter bottle are fixed by riveting.

[0007] In one embodiment, the pre-filter further includes a rivet, and the valve head and the filter bottle are fixed by riveting through the rivet.

[0008] In one embodiment, the filter bottle is provided with a first through hole, the valve head is provided with a second through hole, and the rivet passes through the first through hole and the second through hole in sequence to fix the filter bottle and the valve head.

[0009] In one embodiment, the rivet includes a first limiting portion, a connecting column and a second limiting portion, the first limiting portion and the second limiting portion are respectively located at both ends of the connecting column, and at least one of the first limiting portion and the second limiting portion is formed by bending, the connecting column passes through the first through hole and the second through hole in sequence, and the first limiting portion and the second limiting portion respectively abut against the filter bottle and the valve head on opposite sides of the filter bottle and the valve head.

[0010] In one embodiment, the first limiting portion is disposed outside the connecting column, and the second limiting portion is formed by bending at least one rivet portion, and the rivet portion extends along the axial direction of the connecting column.

[0011] In one embodiment, the second limiting portion is formed by bending a plurality of the riveted portions, the plurality of the riveted portions are distributed along the circumference of the connecting column, and an action space is formed between the plurality of the riveted portions.

[0012] In one embodiment, the second limiting portion is formed by riveting two of the riveted portions, and the two riveted portions are arranged at opposite sides of the connecting column at intervals.

[0013] In one embodiment, the outer periphery of the connecting post is circular, and the two riveted portions are arranged on opposite sides thereof to conform to the outer periphery of the connecting post.

[0014] And / or, the two riveted portions have opposite sides arranged in a plane;

[0015] and / or, the minimum distance between the two riveted portions is s, 2.5 mm ≤ s ≤ 4.5 mm;

[0016] And / or, a height of the riveted portion along the axial direction of the connecting column is h, 3mm≤h≤5mm.

[0017] In one embodiment, the filter bottle is provided with a sink groove on the outer periphery of the first through hole, the sink groove is located on a side of the filter bottle away from the valve head, and the first limiting portion is accommodated in the sink groove.

[0018] In one embodiment, the filter bottle is provided with a first flange and a first through hole, and the valve head is provided with a second flange and a second through hole, the first through hole is provided on the first flange, the second through hole is provided on the second flange, and the first flange and the second flange are in contact with each other;

[0019] And / or, the diameters of the first through hole and the second through hole are both 5 mm to 7 mm.

[0020] The utility model also provides a water use system, comprising the pre-filter as described above.

[0021] The pre-filter in the technical solution of the present utility model includes a filter bottle and a valve head. The filter bottle is provided with a water filter cavity. The valve head is provided with a water inlet and a water outlet. The water inlet and the water outlet are connected through the water filter cavity. The valve head and the filter bottle are riveted and fixed. Thus, the filter bottle and the valve head are reliably assembled by riveting, thereby ensuring the working performance of the pre-filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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.

[0023] Figure 1 A schematic structural diagram of an embodiment of a pre-filter provided by the present utility model;

[0024] Figure 2 for Figure 1 A top view of

[0025] Figure 3 for Figure 2 AA cross-section of the middle riveted part before riveting;

[0026] Figure 4 for Figure 2 AA cross-section of the middle riveted part after riveting;

[0027] Figure 5 for Figure 1 Schematic diagram of the structure of the middle valve head;

[0028] Figure 6 for Figure 1 Schematic diagram of the structure of the middle filter bottle from one perspective;

[0029] Figure 7 for Figure 1 Schematic diagram of the structure of the middle filter bottle from another perspective.

[0030] Description of Figure Numbers:

[0031] 10. Filter bottle; 101. Water filter chamber; 11. First flange; 111. First through hole; 14. Sink; 20. Valve head; 201. Water inlet; 202. Water outlet; 21. Second flange; 211. Second through hole; 30. Riveted part; 31. First limiting part; 32. Connecting column; 33. Riveted part; 34. Working space.

[0032] 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

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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 for residents but also extends the lifespan 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 typically contains a stainless steel filter, a physical filter designed to intercept large particles larger than 40 microns, ensuring back-end water safety.

[0037] Some pre-filters on the market usually have a flushing function, that is, they can be cleaned regularly to discharge the large particles that were previously intercepted, thereby increasing the service life of the pre-filter.

[0038] See also Figures 1 to 5 In one embodiment of the present invention, the pre-filter includes a filter bottle 10 and a valve head 20 connected to the filter bottle 10, the filter bottle 10 has a water filter chamber 101, the valve head 20 has a water inlet 201 and a water outlet 202 connected to the water filter chamber 101, the water inlet 201 is connected to the water supply end, and the water outlet 202 is connected to the water use end.

[0039] It should be noted that the water supply end can be a tap, a water tower or well water, and the water use end can be a faucet, a shower or a drinking water outlet. This application does not make specific restrictions on this.

[0040] Reference Figures 1 to 5 The utility model proposes a pre-filter, comprising:

[0041] A filter bottle 10, wherein the filter bottle 10 is provided with a water filtering chamber 101; and

[0042] The valve head 20 is provided with a water inlet 201 and a water outlet 202 . The water inlet 201 and the water outlet 202 are connected through the water filter cavity 101 . The valve head 20 and the filter bottle 10 are fixed by riveting.

[0043] The pre-filter in the technical solution of the present invention includes a filter bottle 10 and a valve head 2030. The filter bottle 10 is provided with a water filter chamber 101. The valve head 20 is provided with a water inlet 201 and a water outlet 202. The water inlet 201 and the water outlet 202 are connected through the water filter chamber 101. The valve head 20 and the filter bottle 10 are riveted and fixed; thereby, the filter bottle 10 and the valve head 20 are reliably assembled by riveting, thereby ensuring the working performance of the pre-filter.

[0044] In one embodiment, the pre-filter further includes a rivet 30, and the valve head 20 and the filter bottle 10 are riveted together. It is understood that the rivet 30 is used to rivet the valve head and the filter bottle together, so that when the valve head and the filter bottle need to be disassembled, only the filter element needs to be removed, and then a new filter element is replaced and riveted. If the valve head and the filter bottle are directly riveted together, the valve head and / or the filter bottle may be damaged during disassembly, thereby affecting subsequent use.

[0045] At the same time, further, in the technical solution of the present application, the valve head 20 and the filter bottle 10 are riveted and fixed by a rivet 30; compared with the method of setting a threaded structure on the filter bottle 10 or the valve head 20, and then using a tooling fixture to drive the valve head 20 to rotate, in the technical solution of the present application, it is only necessary to rivet the rivet 30 by a riveting tool to achieve the riveting fixation of the filter bottle 10 and the valve head 20, thereby simplifying the installation process of the filter bottle 10 and the valve head 20, thereby reducing the assembly difficulty of the pre-filter and improving the installation efficiency of the pre-filter.

[0046] Specifically, the filter bottle 10 is provided with a first through-hole 111, and the valve head 20 is provided with a second through-hole 211. The rivet 30 passes through the first through-hole 111 and the second through-hole 211 in sequence to secure the filter bottle 10 to the valve head 20. The rivet 30 passing through the first through-hole 111 and the second through-hole 211 not only facilitates the installation and positioning of the rivet 30, but also enhances the positioning and securing function of the rivet 30, thereby improving the installation efficiency between the filter bottle 10 and the valve head 20 and enhancing the stability and reliability of the connection between the filter bottle 10 and the valve head 20.

[0047] Furthermore, the rivet 30 includes a first limiting portion 31, a connecting column 32 and a second limiting portion, the first limiting portion 31 and the second limiting portion are respectively located at both ends of the connecting column 32, and at least one of the first limiting portion 31 and the second limiting portion is formed by bending, the connecting column 32 passes through the first through hole 111 and the second through hole 211 in sequence, and the first limiting portion 31 and the second limiting portion respectively abut against the filter bottle 10 and the valve head 20 on opposite sides of the filter bottle 10 and the valve head 20. When installing the filter bottle 10 and the valve head 20, it is only necessary to pass the first limiting portion 31 or the second limiting portion through the first through hole 111 and the second through hole 211, and then use a riveting tool to rivet the first limiting portion 31 and / or the second limiting portion so that the first limiting portion 31 and the second limiting portion abut against the filter bottle 10 and the valve head 20 on opposite sides of the filter bottle 10 and the valve head 20, respectively, thereby achieving riveting fixation between the filter bottle 10 and the valve head 20, thereby improving the installation efficiency between the filter bottle 10 and the valve head 20 and improving the stability and reliability of the installation between the filter bottle 10 and the valve head 20. The riveting tool can be a manual riveting pliers, a pneumatic rivet gun, an electric rivet gun, etc.

[0048] Specifically, the first limiting portion 31 is disposed around the connecting post 32, and the second limiting portion is formed by bending at least one rivet 33, which extends along the axial direction of the connecting post 32. It can be understood that the second limiting portion and the rivet 33 are two states of the same object. In the initial state, the end of the connecting post 32 away from the first limiting portion 31 is the rivet 33, which extends along the axial direction of the connecting post 32, thereby facilitating the insertion of the rivet 30 into the first through-hole 111 and the second through-hole 211 through the rivet 33 and the connecting post 32. In the riveted state, after the rivet 33 and the connecting post 32 are inserted into the first through-hole 111 and the second through-hole 211, the rivet 33 is riveted by a riveting tool, causing the rivet 33 to be deformed into the second limiting portion, thereby causing the second limiting portion to abut against the side of the valve head 20 facing away from the filter bottle 10, thereby securing the filter bottle 10 to the valve head 20. This improves the installation efficiency between the filter bottle 10 and the valve head 20 , and improves the installation stability and reliability between the filter bottle 10 and the valve head 20 .

[0049] Furthermore, the second limiting portion is formed by bending a plurality of the riveted portions 33. The plurality of riveted portions 33 are distributed along the circumference of the connecting column 32, and a working space 34 is formed between the plurality of riveted portions 33. The provision of the working space 34 facilitates riveting the riveted portions 33 with a riveting tool, thereby improving the riveting efficiency and, in turn, the installation efficiency between the filter bottle 10 and the valve head 20.

[0050] Furthermore, the second limiting portion is formed by riveting two rivet portions 33, which are spaced apart on opposite sides of the connecting column 32. It can be understood that the two rivet portions 33 are arranged opposite each other, thereby limiting and abutting the valve head 20 from opposite sides, thereby improving the stability and reliability of the riveted connection of the rivet 30. Of course, in other embodiments, three, four, or five rivet portions 33 may be evenly spaced on the connecting column 32.

[0051] In one embodiment, the outer periphery of the connecting post 32 is circular, and the two rivet portions 33 are arranged to conform to the outer periphery of the connecting post 32 on opposite sides thereof. This conformity of the rivet portions 33 to the outer periphery of the connecting post 32 reduces the number of processing steps required for the rivet portions 33, thereby reducing the manufacturing cost of the rivet 30. The first stopper 31, the connecting post 32, and the second stopper may be integrally cast, or the rivet 30 may be formed by cutting the entire component to obtain a predetermined shape.

[0052] In another embodiment, the two riveted portions 33 are arranged on a plane with their sides facing away from each other. In this way, the riveted area between the riveted portion 33 and the valve head 20 is increased after riveting, thereby increasing the stability and reliability of the connection between the filter bottle 10 and the valve head 20.

[0053] Furthermore, the two opposite sides of the riveted parts 33 are arranged in a plane. On the one hand, the two opposite sides of the riveted parts 33 are arranged in a plane, which can facilitate the production and processing of the riveted parts 33. On the other hand, the plane setting also facilitates the use of riveting tools, thereby improving the riveting efficiency between the filter bottle 10 and the valve head 20.

[0054] In one embodiment, the diameters of the first through hole 111 and the second through hole 211 are both between 5 mm and 7 mm. That is, the diameters of the first through hole 111 and the second through hole are both greater than or equal to 5 mm and less than or equal to 7 mm. First through holes 1111111 with a diameter between 5 mm and 7 mm are widely used in various fields, such as machinery manufacturing, equipment installation, building construction, furniture assembly, automobile manufacturing, and electronic equipment. Therefore, a variety of bolts 31 with corresponding diameters are available for selection.

[0055] Optionally, the minimum spacing between the two rivet portions 33 is s, 2.5 mm ≤ s ≤ 4.5 mm. If s < 2.5 mm, it is inconvenient to use the riveting tool, and thus, it is inconvenient to rivet the rivet 30. If s > 4.5 mm, the thickness of the rivet portion 33 is too small, thereby reducing the structural strength of the rivet portion 33 and the stability and reliability of the connection between the filter bottle 10 and the valve head 20. By properly setting the spacing between the two rivet portions 33, the structural strength of the rivet portion 33 is ensured, and the installation of the riveting tool is also facilitated.

[0056] Specifically, the height of the rivet portion 33 along the axial direction of the connecting column 32 is h, and 3mm≤h≤5mm. It is understandable that the rivet portion 33 will be bent and deformed by the riveting tool, thereby limiting the contact with the valve head 20. Therefore, if h is less than 3mm, the height of the rivet portion 33 will be too low, which will not only make it difficult to rivet the riveting tool, but also result in a smaller riveted area between the rivet 30 and the valve head 20, thereby reducing the riveting strength between the filter bottle 10 and the valve head 20. If h is greater than 5mm, the rivet 30 may interfere with the outer peripheral surface of the valve head 20 when the riveting tool is riveting the rivet 30, thereby making it difficult to rivet the rivet 30.

[0057] In one embodiment, the filter bottle 10 is provided with a recessed groove 14 on the outer periphery of the first through hole 111. The recessed groove 14 is located on the side of the filter bottle 10 facing away from the valve head 20, and the first stopper 31 is accommodated in the recessed groove 14. The recessed groove 14 prevents the first stopper 31 from being directly exposed, thereby reducing the risk of rust on the filter element and increasing the service life of the rivet 30. Furthermore, the inner circumferential wall of the recessed groove 14 also serves to limit the first stopper 31, thereby improving the riveting effect of the rivet 30 and enhancing the stability and reliability of the connection between the filter bottle 10 and the valve head 20.

[0058] In one embodiment, the filter bottle 10 is provided with a first flange 11 and a first through-hole 111, and the valve head 20 is provided with a second flange 21 and a second through-hole 211. The first through-hole 111 is provided on the first flange 11, and the second through-hole 211 is provided on the second flange 21. The first flange 11 and the second flange 21 are in close contact with each other. The addition of the first flange 11 and the second flange 21, in conjunction with the rivet 30, increases the contact area between the valve head 20 and the filter bottle 10, thereby reducing the possibility of shaking between the valve head 20 and the filter bottle 10 and loosening of the rivet 30 due to vibration or shaking between the valve head 20 and the filter bottle 10, thereby improving the connection strength between the valve head 20 and the filter bottle 10. Furthermore, the close contact between the first flange 11 and the second flange 21 also enhances the airtightness between the valve head 20 and the filter bottle 10. Of course, in other embodiments, other positions may also abut against each other to achieve the splicing of the filter bottle 10 and the valve head 20. For example, in an embodiment where the first flange 11 and the second flange 21 are not provided, the connecting pipe mouth of the valve head 20 and the bottle mouth edge of the filter bottle 10 abut against each other.

[0059] In one embodiment, the first flange 11 and the second flange 21 are both polygonal or quasi-polygonal in shape. Multiple first through holes 111 and multiple second through holes 211 are provided, with one first through hole 111 corresponding to one second through hole 211. The multiple first through holes 111 and multiple second through holes 211 are located at the corners of the first flange 11 and the second flange 21, respectively. As can be appreciated, the corners of the first and second flanges 11 and 21 provide ample free space, which facilitates the installation and mating of the rivet 30, thereby improving the efficiency of the assembly between the valve head 20 and the filter bottle 10. Of course, in other embodiments, only the first flange 11 may be provided around the opening of the water filtration chamber 101, or only the second flange 21 may be provided around the valve head 20.

[0060] For example, Figure 6 and Figure 7 As shown in the figure, the outer contours of the first flange 11 and the second flange 21 are both roughly square in shape, and therefore have four corresponding corners. Four positioning protrusions are provided corresponding to these four corners, and each corresponds to the four corners. In this way, the multiple corners of the second flange 21 are all provided with conforming positioning protrusions for positioning and matching, which can not only improve the positioning reliability of the valve head 20 and the filter bottle 10, but also form multiple avoidance gaps for selection, thereby facilitating the operation of prying the valve head 20. Of course, in other embodiments, the positioning protrusions can also extend along the outer contour of the first flange 11 and be connected end to end.

[0061] Furthermore, the pre-filter also includes a filter element 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 is filtered out by the filter element as it flows through the water filter chamber 101, removing large particles. The filtered water then flows out of the pre-filter through the water outlet 202 and toward the water consumption end. This process achieves a coarse filtration of the raw water.

[0062] Among them, a clean water chamber is formed in the filter element, and the filter element filters the water in the water filter chamber 101 and then flows it into the clean water chamber. An annular partition plate is also provided in the valve head 20, and the annular partition plate extends along the axial direction of the filter bottle 10. The annular partition plate divides the valve head 20 into a water inlet chamber and a water outlet chamber. The water inlet 201 is connected to the water inlet chamber, and the water outlet 202 is connected to the water outlet chamber. The valve head 20 is sealed to the filter bottle 10, and the annular partition plate is sealed to the filter element, so that the water inlet chamber is connected to the water filter chamber 101, and the clean water chamber is connected to the water outlet chamber. The water entering from the water inlet 201 flows out through the water inlet chamber, the water filter chamber 101, the clean water chamber, the water outlet chamber and the water outlet 202 in sequence.

[0063] The present invention also proposes a water use system, which includes the aforementioned pre-filter. The specific structure of the pre-filter refers to the above-mentioned embodiment. Since the present water use system adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0064] Among them, the water use system at least includes relevant components from the pre-filter to the water use end. For example, the water use system may include household appliances such as water heaters, dishwashers, and water dispensers, and may also include accessories such as water pipes for domestic water use throughout the house.

[0065] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A pre-filter, characterized in that: include: A filter bottle, wherein the filter bottle is provided with a water filtering cavity; and A valve head is provided with a water inlet and a water outlet, the water inlet and the water outlet are communicated with each other through the water filter cavity, and the valve head and the filter bottle are fixed by riveting.

2. The prefilter according to claim 1, wherein The pre-filter further comprises a rivet, and the valve head and the filter bottle are fixed by riveting through the rivet.

3. The prefilter according to claim 2, wherein: The filter bottle is provided with a first through hole, the valve head is provided with a second through hole, and the rivet passes through the first through hole and the second through hole in sequence to fix the filter bottle and the valve head.

4. The prefilter according to claim 3, characterized in that The rivet includes a first limiting portion, a connecting column and a second limiting portion. The first limiting portion and the second limiting portion are respectively located at both ends of the connecting column, and at least one of the first limiting portion and the second limiting portion is formed by bending. The connecting column passes through the first through hole and the second through hole in sequence. The first limiting portion and the second limiting portion respectively abut against the filter bottle and the valve head on opposite sides of the filter bottle and the valve head.

5. The pre-filter according to claim 4, characterized in that The first limiting portion is arranged around the outside of the connecting column, and the second limiting portion is formed by bending at least one rivet portion, and the rivet portion extends along the axial direction of the connecting column.

6. The prefilter according to claim 5, characterized in that The second limiting portion is formed by bending a plurality of the riveted portions, the plurality of the riveted portions are distributed along the circumference of the connecting column, and an action space is formed between the plurality of the riveted portions.

7. The prefilter according to claim 6, wherein: The second limiting portion is formed by riveting two of the riveted portions, and the two riveted portions are arranged at opposite sides of the connecting column at intervals.

8. The pre-filter according to claim 7, characterized in that The outer periphery of the connecting column is circular, and the two riveted portions are arranged on opposite sides to conform to the outer periphery of the connecting column; And / or, the two riveted portions have opposite sides arranged in a plane; and / or, the minimum distance between the two riveted portions is s, 2.5 mm ≤ s ≤ 4.5 mm; And / or, a height of the riveted portion along the axial direction of the connecting column is h, 3mm≤h≤5mm.

9. The prefilter according to claim 5, wherein: The filter bottle is provided with a sink groove on the outer periphery of the first through hole. The sink groove is located on a side of the filter bottle away from the valve head. The first limiting portion is accommodated in the sink groove.

10. The pre-filter according to claim 1, wherein: The filter bottle is provided with a first flange and a first through hole, and the valve head is provided with a second flange and a second through hole. The first through hole is provided on the first flange, and the second through hole is provided on the second flange, and the first flange and the second flange are in contact with each other.

11. The prefilter according to claim 10, wherein: The first flange and the second flange are both polygonal or quasi-polygonal in shape, a plurality of the first through holes and a plurality of the second through holes are provided, one first through hole corresponds to one second through hole, and the plurality of the first through holes and the plurality of the second through holes are respectively provided at corners of the first flange and the second flange; and / or The diameters of the first through hole and the second through hole are both 5 mm to 7 mm.

12. A water system, characterized in that: The method comprises the pre-filter according to any one of claims 1 to 11.

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