Pre-filter and water system

Abstract

The utility model discloses a pre-filter and a water system, and relates to the technical field of filtering equipment, the pre-filter comprises a valve head and a filter bottle, the valve head is provided with a water inlet and a water outlet; the filter bottle is provided with a water filtering cavity, the water filtering cavity is communicated with the water inlet and the water outlet, and the filter bottle is connected to the valve head through a fastener. According to the technical scheme provided by the utility model, the filter bottle and the valve head are connected through the fastener, so that the manufacturing complexity and the assembly difficulty of the pre-filter are reduced.

Description

Technical Field

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

[0002] The valve head and filter bottle of the existing pre-filter are connected by threads. This connection method requires the use of specific tooling fixtures for production and manufacturing. During the assembly process, the valve head and filter bottle must be accurately aligned, and the rotational torque must be strictly controlled to ensure that the valve head and filter bottle are connected in place. This increases the complexity of production and the difficulty of assembly operations. Utility Model Content

[0003] The main purpose of the utility model is to provide a pre-filter and a water use system, aiming to connect the filter bottle and the valve head by fasteners, thereby reducing the manufacturing complexity and assembly difficulty of the pre-filter.

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

[0005] a valve head, the valve head being provided with a water inlet and a water outlet; and

[0006] The filter bottle is provided with a water filter cavity, the water filter cavity is connected to the water inlet and the water outlet, and the filter bottle is connected to the valve head through a fastener.

[0007] In one embodiment, the fastener comprises a bolt, and the filter bottle and the valve head are connected by the bolt.

[0008] In one embodiment, a first flange is provided on the periphery of the filter bottle, and a second flange is provided on the periphery of the valve head. The first flange and the second flange form a communicating through hole, and the fastener is passed through the through hole.

[0009] In one embodiment, a through hole for the bolt to pass through is provided at the connection between the valve head and the filter bottle, and at least the through hole away from the head of the bolt is configured as a screw hole, and the screw hole is threadedly connected to the bolt.

[0010] In one embodiment, the fastener further includes a nut, and the bolt is threadedly connected to the corresponding nut.

[0011] In one embodiment, the pre-filter is provided with a limiting groove, and the nut is limitedly installed in the limiting groove.

[0012] In one embodiment, the filter bottle is provided with a through hole for the bolt to pass through, and the limiting groove is provided with an avoidance gap on the side wall opposite to the through hole of the filter bottle, and the avoidance gap is used to avoid the bolt.

[0013] In one embodiment, the fasteners are provided in plurality and are evenly distributed along the periphery of the filter bottle or the valve head.

[0014] In one embodiment, the first flange and the second flange are respectively arranged around the outer circumference of the filter bottle and the valve head.

[0015] In one embodiment, the first flange and the second flange are in abutment with each other.

[0016] In one embodiment, a distance between two opposite sides of the second flange is L, an inner diameter of the valve head is D, and L and D satisfy: 5.4 mm ≤ LD ≤ 9.4 mm.

[0017] In one embodiment, the outer peripheries of the first flange and the second flange are polygonal or quasi-polygonal, and the through holes are located at corners of the first flange or the second flange.

[0018] In one embodiment, the corners of the first flange and / or the second flange are configured as rounded corners, and the center of the through hole and the center of the rounded corner are located at the same position.

[0019] In one embodiment, the outer peripheries of the first flange and the second flange are arranged in a square shape, and one through hole is correspondingly provided at each of the four corners.

[0020] The present invention also provides a water use system, which includes the pre-filter as described above.

[0021] The technical solution of the present invention is to connect the filter bottle and the valve head through fasteners, and the fasteners are not arranged at the connection point between the valve head and the filter bottle. While the fasteners stably connect the valve head and the filter bottle, it also ensures that the water flow can stably flow from the water inlet to the water filter chamber for filtration, and then flow out from the water outlet. In this way, the valve head and the filter bottle do not need to be post-processed. After the valve head and the filter bottle are formed, they can be stably connected by fasteners. In addition, the alignment requirements of the valve head and the filter bottle are low. At the same time, there is no need to accurately control the torque in the process of connecting the valve head and the filter bottle. The valve head and the filter bottle can be simply connected by fasteners, thereby reducing the difficulty of production and assembly 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 1A schematic structural diagram of an embodiment of a pre-filter provided by the present utility model;

[0024] Figure 2 for Figure 1 Cross-sectional view of the middle pre-filter;

[0025] Figure 3 for Figure 2 A partial enlarged view of point A in the middle;

[0026] Figure 4 for Figure 1 A schematic structural diagram of the middle valve head from one perspective;

[0027] Figure 5 for Figure 1 A structural diagram of the middle valve head from another perspective;

[0028] Figure 6 for Figure 1 A 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] Figure 8 for Figure 1 Bottom view of the middle filter bottle;

[0031] Figure 9 for Figure 1 Schematic diagram of the structure of the middle filter bottle equipped with a nut;

[0032] Figure 10 for Figure 1 Bottom view of the middle filter bottle with the nut installed;

[0033] Figure 11 A side view of the pre-filter provided by the utility model;

[0034] Figure 12 This is a top view of the pre-filter provided by the utility model.

[0035] Description of Figure Numbers:

[0036] 10. Filter bottle; 101. Water filter chamber; 11. First flange; 111. Through hole; 121. Mounting port; 122. Limiting groove; 123. Avoidance gap;

[0037] 20. Valve head; 201. Water inlet; 202. Water outlet; 21. Second flange; 31. Bolt; 32. Nut.

[0038] 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

[0039] 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 any creative work are within the scope of protection of the present invention.

[0040] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), such directional indications are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0041] 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 fact that ordinary technicians in this field can implement it. 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.

[0042] In the prior art, the valve head and filter bottle of the pre-filter are usually provided with threads at the connection point, such as an internal thread is provided on the inner periphery of the connection port of the valve head, and an external thread is provided on the outer periphery of the connection head of the filter bottle, so that the valve head and the filter bottle are directly threadedly connected. In this connection structure, the production process of the valve head and the filter bottle requires a clamp to fix them, and then the threads are unscrewed, which not only increases the molding process but also affects the structural strength of the connection. In addition, during the connection process of the valve head and the filter bottle, the internal thread of the valve head and the external thread of the filter bottle need to be aligned, and then the valve head or the filter bottle is screwed together. Not only does it need to ensure the coaxiality of the axis of the valve head and the filter bottle, but it also needs to better control the screwing torque to achieve just the right connection stability, which puts higher requirements on the torque and screwing position, thereby increasing the complexity of the production and assembly process of the pre-filter.

[0043] Before introducing the connection structure of the valve head and the filter bottle of the present invention, the water filtering process of the pre-filter is first introduced. During the use of the pre-filter, tap water first enters the valve head from the water inlet, and enters the water filter cavity of the filter bottle under the guidance of the water inlet section in the valve head. The tap water is filtered by the filter element assembly in the water filter cavity, and then, under the action of pressure, the filtered tap water flows out from the water outlet to the water-using equipment. After a period of use, a certain amount of impurities will be deposited in the filter element assembly and the water filter cavity. At this time, the water outlet can be closed, and the drain valve of the filter bottle can be opened to guide the tap water coming in from the water inlet to flush the valve element assembly and the filter bottle to improve the filtering capacity of the filter element assembly. 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.

[0044] Pre-filters are used in water systems. For example, whole-house water purification systems typically feature a pre-filter, which filters 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. A pre-filter is the first coarse filtration device in a whole-house water purification system. It is a physical filtration device that primarily intercepts large particles larger than 40 microns, ensuring back-end water safety.

[0045] The utility model provides a pre-filter.

[0046] Please refer to Figures 1 to 6 In one embodiment of the present invention, the pre-filter includes:

[0047] The valve head 20 is provided with a water inlet 201 and a water outlet 202; and

[0048] The filter bottle 10 is provided with a water filter chamber 101 , the water filter chamber 101 is connected to the water inlet 201 and the water outlet 202 , and the filter bottle 10 is connected to the valve head 20 via fasteners.

[0049] The technical solution of the present invention is to connect the filter bottle 10 and the valve head 20 by fasteners, and the fasteners are not arranged at the connection point between the valve head 20 and the filter bottle 10. While the fasteners stably connect the valve head 20 and the filter bottle 10, it also ensures that the water flow can stably flow from the water inlet 201 to the water filter chamber 101 for filtration, and then flow out from the water outlet 202. In this way, the valve head 20 and the filter bottle 10 do not need to be post-processed. After the valve head 20 and the filter bottle 10 are formed, they can be stably connected by fasteners. In addition, the alignment requirements of the valve head 20 and the filter bottle 10 are low. At the same time, there is no need to accurately control the torque during the connection of the valve head 20 and the filter bottle 10. The valve head 20 and the filter bottle 10 can be simply connected by fasteners, thereby reducing the difficulty of production and assembly of the pre-filter.

[0050] It should be noted that the fasteners can be configured as screws, bolts 31, rivets, pins, and pin shafts, etc., so as to connect the valve head 20 and the filter bottle 10 by screwing, riveting, or latching. In the case of screwing, the screw or bolt 31 can be directly screwed to the valve head 20 or the filter bottle 10, or can be connected to the valve head 20 and the filter bottle 10 by coupling with the nut 32. In the case of riveting, the rivet can be directly riveted to the valve head 20 or the filter bottle 10. In the case of latching, the pin can be directly inserted into the valve head 20 and the filter bottle 10, or can be connected by coupling with the pin shaft. In particular, when the fastener is configured as two components, such as the screw and the nut 32, or the pin and the pin shaft, one of them can be pre-fixed to the valve head 20 or the filter bottle 10, or can be integrally formed with the valve head 20 or the filter bottle 10, to facilitate the fastener to connect the valve head 20 and the filter bottle 10. It should be noted that through holes 111 are provided between the filter bottle 10 and the valve head 20 for fasteners to pass through. The through holes 111 can be distributed along the circumference of the connection between the filter bottle 10 and the valve head 20, or can be spaced apart on the outer periphery of the filter bottle 10 or the valve head 20 relative to the connection between the filter bottle 10 and the valve head 20. In this embodiment, the nut 32 is configured as a hexagonal nut and the bolt 31 is configured as an M6 bolt. In other embodiments, the nut 32 can also be configured as a square nut and the bolt 31 can be configured as an M8 bolt.

[0051] In one embodiment, please refer to Figure 2 and Figure 3 The fastener includes a bolt 31, which connects the filter bottle 10 and the valve head 20. It will be appreciated that connecting the filter bottle 10 and the valve head 20 via the bolt 31 facilitates connection operations for technicians. Furthermore, the connection between the filter bottle 10 and the valve head 20 is minimally modified by the installation of the bolt 31, ensuring a tight seal at the connection. The bolt 31 can be threadedly connected to one of the filter bottle 10 and the valve head 20, with the head of the bolt 31 located on the other side, thereby ensuring a stable connection between the valve head 20 and the filter bottle 10. Alternatively, the bolt 31 can be mated with a nut 32, with the head of the bolt 31 and the nut 32 located on opposite sides of the connection between the filter bottle 10 and the valve head 20. Of course, in other embodiments, the fastener can also be a rivet, with the filter bottle 10 and the valve head 20 connected by riveting.

[0052] Further, in this embodiment, please refer to Figure 1 、 Figure 11 and Figure 12A through hole 111 for the bolt 31 to pass through is provided at the connection between the valve head 20 and the filter bottle 10 , and at least the through hole 111 away from the head of the bolt 31 is configured as a screw hole, and the screw hole is screwed to the bolt 31 . It can be understood that the external thread on the bolt 31 is connected to the internal thread of the through hole 111, and the valve head 20 and the filter bottle 10 can be connected by simply screwing the bolt 31 into the through hole 111, wherein the screw hole connected with the bolt 31 can be the through hole 111 on the first flange 11, at this time, the bolt 31 is passed from the through hole 111 of the second flange 21 to the first flange 11, and then screwed into the through hole 111 of the first flange 11, and the head of the bolt 31 abuts against the side of the second flange 21 away from the first flange 11, or the screw hole connected with the bolt 31 can also be the through hole 111 on the second flange 21, at this time, the bolt 31 is passed from the through hole 111 of the first flange 11 to the second flange 21, and then screwed into the through hole 111 of the second flange 21, and the head of the bolt 31 abuts against the side of the first flange 11 away from the second flange 21. Of course, the through holes 111 of the first flange 11 and the second flange 21 can be configured as screw holes, and the bolts 31 are screwed to the first flange 11 and the second flange 21. The bolts 31 can be passed through and connected from the first flange 11 to the second flange 21, or from the second flange 21 to the first flange 11.

[0053] In one embodiment, please refer to Figure 3 、 Figure 5 and Figure 9 The fasteners also include a nut 32, and the bolt 31 is threadedly connected to the corresponding nut 32. It is understood that at the connection between the filter bottle 10 and the valve head 20, the nut 32 can be positioned on either the side of the valve head 20 facing away from the filter bottle 10 or the side of the filter bottle 10 facing away from the valve head 20. Correspondingly, the head of the bolt 31 can be positioned on either the side of the valve head 20 facing away from the filter bottle 10 or the side of the filter bottle 10 facing away from the valve head 20. In this manner, the bolt 31 is threadedly connected to the nut 32, eliminating the need for threads on the wall of the through hole 111 and reducing the difficulty of molding the valve head 20 or the filter bottle 10. Furthermore, if the threads become worn, replacing the bolt 31 and nut 32 can re-stabilize the connection between the valve head 20 and the filter bottle 10, facilitating subsequent maintenance and extending the service life of the pre-filter.

[0054] Further, in this embodiment, please refer to Figures 7 to 10The pre-filter is provided with a limiting groove 122, and the nut 31 is limitedly installed in the limiting groove 122. It should be noted that the limiting groove 122 can be located on the valve head 20 or the filter bottle 10, which is manifested as follows: when the bolt 31 is passed from the valve head 20 to the filter bottle 10, the limiting groove 122 is located on one side of the filter bottle 10, wherein the limiting groove 122 can be formed by a concave shape on the filter bottle 10, or formed on a mounting structure extending from the valve head 20 toward the filter bottle 10, the mounting structure having a portion bent to the bolt facing the valve head 20 side, and the limiting groove 122 is formed on this portion of the mounting structure; when the bolt 31 is passed from the filter bottle 10 to the valve head 20, the limiting groove 122 is located on one side of the valve head 20, wherein the limiting groove 122 can be formed by a concave shape on the valve head 20, or can be provided on the filter bottle 10 with a general mounting structure as described above. In this way, under the limiting action of the limiting groove 122, the nut 32 can be pre-fixed in the pre-filter and remain stable in the limiting groove 122. During the assembly of the valve head 20 and the filter bottle 10, the nut 32 is first installed in the limiting groove 122, and then the bolt 31 passes through the through hole 111 and is connected to the nut 32. In this way, during the threaded connection process, the user only needs to act on the bolt 31, without having to operate the nut 32 and the bolt 31 at the same time, thereby improving the convenience of connecting the bolt 31 and the nut 32, and thus improving the convenience of connecting the valve head 20 and the filter bottle 10. Of course, in other embodiments, the nut 32 can also be integrally formed with the filter bottle 10 in the valve head 20 or the filter bottle 10, and the bolt 31 passing through the through hole 111 is also the process of connecting the nut 32.

[0055] Further, in this embodiment, please refer to Figures 6 to 8The filter bottle 10 is provided with a through hole 111 for the bolt 31 to pass through, and the limiting groove 122 is provided with an avoidance notch 123 on the side wall opposite to the through hole 111 of the filter bottle 10, and the avoidance notch 123 is used to avoid the bolt 31. With reference to the above description of the first flange 11 and the second flange 21, it can be understood that the limiting groove 122 is provided on the filter bottle 10, and the avoidance notch 123 is opposite to the through hole 111 of the first flange 11. After the bolt 31 is connected to the nut 32, the bolt 31 is inevitably partially protruded from the nut 32. At this time, the avoidance notch 123 avoids the end of the bolt 31, ensuring that the nut 32 can be tightly attached to the first flange 11, so that the first flange 11 and the second flange 21 are tightly fitted, ensuring the connection stability of the valve head 20 and the filter bottle 10, and at the same time reducing the spacing of the limiting groove 122 along the axial direction of the filter bottle 10, so that the limiting groove 122 can limit the nut 32 in the axial direction, avoiding displacement of the nut 32 during the pre-fixing process, and improving the connection convenience of the bolt 31 and the nut 32. Of course, in other embodiments, the axial height of the limiting groove 122 is larger, and a groove or a protrusion is set on the side wall of the limiting groove 122 facing the through hole 111 of the first flange 11 along the axial direction of the filter bottle 10, or a clamping structure is set on the peripheral wall of the limiting groove 122, so that after the nut 32 is installed in the limiting groove 122, it is close to the through hole 111 of the first flange 11, and thus there is an avoidance space between the side wall of the limiting groove 122 facing the through hole 111 of the first flange 11 to avoid the end of the bolt 31.

[0056] In one embodiment, please refer to Figure 4 and Figure 8 Multiple fasteners are provided and evenly distributed along the periphery of the filter bottle 10 or valve head 20. This ensures that the connection between the valve head 20 and the filter bottle 10 is uniform throughout the periphery of the prefilter, preventing weak points in the connection between the valve head 20 and the filter bottle 10 and thus ensuring the tightness of the connection between the valve head 20 and the filter bottle 10. Of course, in other embodiments, the locations for fasteners to penetrate the valve head 20 and the filter bottle 10 can also be unevenly distributed around the periphery of the prefilter, with a focus on the side that accommodates the water inlet 201 and the water outlet 202.

[0057] In one embodiment, please refer to Figure 5 and Figure 6The outer periphery of the filter bottle 10 is provided with a first flange 11, and the outer periphery of the valve head 20 is provided with a second flange 21. The first flange 11 and the second flange 21 are formed with a communicating through hole 111, and the through hole 111 is for fasteners to pass through. With reference to the above description, the fastener is configured as a bolt. It can be understood that the first flange 11 is protruding outward on the periphery of the filter bottle 10, and the second flange 21 is protruding outward on the periphery of the valve head 20. The first flange 11 and the second flange 21 are parallel to each other or spaced apart, and both are provided with a through hole 111. The bolt 31 is passed through the through hole 111 of the first flange 11 and the second flange 21 to stably connect the valve head 20 and the filter bottle 10. In this way, the first flange 11 and the second flange 21 not only avoid the communication structure between the valve head 20 and the filter bottle 10, but also the first flange 11 and the second flange 21 form a connection positioning for the valve head 20 and the filter bottle 10, which not only avoids interference with the communication sealing of the valve head 20 and the filter bottle 10, but also improves the convenience of connecting the valve head 20 and the filter bottle 10. In addition, multiple bolts 31 are provided and distributed around the periphery of the pre-filter. In the event that a bolt 31 fails, the remaining bolts 31 can still ensure the stability of the connection between the valve head 20 and the filter bottle 10, thereby improving the reliability of the pre-filter. Of course, in other embodiments, the peripheral wall of the connection between the valve head 20 and the filter bottle 10 is set thicker, and a through hole 111 is axially defined in the peripheral wall of the connection between the valve head 20 and the filter bottle 10. The bolts 31 are inserted into the through hole 111 to connect the valve head 20 and the filter bottle 10.

[0058] Further, in this embodiment, please refer to Figure 4 and Figure 8 The first flange 11 and the second flange 21 are respectively disposed around the outer peripheries of the filter bottle 10 and the valve head 20. It will be appreciated that the first flange 11 is disposed continuously around the outer periphery of the filter bottle 10, while the second flange 21 is disposed in an annular connection around the outer periphery of the valve head 20, thereby enhancing the integrity of the first and second flanges 11, 21. The connection between the first and second flanges 11, 21 further enhances the integrity of the pre-filter. Of course, in other embodiments, the first and second flanges 11, 21 may also be disposed in segments around the outer peripheries of the filter bottle 10 and the valve head 20, respectively.

[0059] It can be understood that in this embodiment, please refer to Figure 1 、 Figure 2 、 Figure 11 and Figure 12, the first flange 11 and the second flange 21 abut against each other. Referring to the connection relationship between the bolt 31 and the nut 32 described above, when the bolt 31 is connected to the nut 32, the valve head 20 and the filter bottle 10 are connected. At this time, the first flange 11 and the second flange 21 abut against each other, which can ensure the sealing of the connection between the valve head 20 and the filter bottle 10 and provide an operational positioning for the connection between the bolt 31 and the nut 32, facilitating the connection of the bolt 31 and the nut 32. Of course, in other embodiments, a sealing gasket can also be provided between the first flange 11 and the second flange 21, or the first flange 11 and the second flange 21 can also be spaced apart, and the sealing point between the valve head 20 and the filter bottle 10 is located at the periphery of the connection point between the valve head 20 and the filter bottle 10.

[0060] In one embodiment, please refer to Figure 4 and Figure 8 The outer peripheries of the first flange 11 and the second flange 21 are polygonal or quasi-polygonal, and the through-holes 111 are located at the corners of the first flange 11 or the second flange 21. The shape formed by the periphery of the first flange 11 is polygonal or quasi-polygonal, that is, the periphery can be formed by a broken line or a combination of arcs and line segments. The second flange 21 is set with reference to the shape of the first flange 11, and the two are tightly connected. In this way, the corners of the first flange 11 are clearly protruding from the outside of the filter bottle 10. The through-holes 111 are set at the corners of the first flange 11 and the second flange 21, providing sufficient space for the installation of fasteners, avoiding weakening the structural stability of the first flange 11 on the filter bottle 10 due to the provision of the through-holes 111. The design of the second flange 21 is the same as the design requirements of the first flange 11, thereby improving the connection stability between the filter bottle 10 and the valve head 20.

[0061] Specifically, in this embodiment, please continue to refer to Figure 4 and Figure 8 The outer periphery of the first flange 11 and the second flange 21 is square, and each of the four corners is provided with a through hole 111. The first flange 11 and the second flange 21 each have four evenly distributed corners. The water inlet 201 and the water outlet 202 are coaxially arranged, and the distribution direction is perpendicular to the distribution direction of any two adjacent corners. This prevents the water inlet 201 and the water outlet 202 from obstructing the connection operation of the fasteners, and at the same time, it also ensures the stability of the connection between the valve head 20 and the filter bottle 10.

[0062] Further, in this embodiment, please refer to Figure 4 and Figure 5At least one of the first and second flanges 11, 21 has a rounded corner, with the center of the through-hole 111 co-located with the center of the rounded corner. It is understood that the outer periphery of the corners of the first and second flanges 11, 21 is provided with an arc, the center of which is co-located with the center of the through-hole 111. Thus, after the fastener is inserted through the through-hole 111, the support force exerted by the fastener 111 on the outer periphery of the corners of the first and second flanges 11, 21 becomes uniform, thereby ensuring the uniformity and stability of the force between the first and second flanges 11, 21 in the circumferential direction, thereby improving the connection stability and sealing performance between the valve head 20 and the filter bottle 10. Furthermore, the rounded corners of the first and second flanges 11, 21 prevent damage to the corners, further ensuring the stability of the connection between the valve head 20 and the filter bottle 10. Of course, in other embodiments, the corner of at least one of the first flange 11 and the second flange 21 may also be configured as a square corner.

[0063] In one embodiment, please refer to Figure 5 The distance between the two opposite sides of the second flange 21 is L, the inner diameter of the valve head 20 is D, and L and D satisfy: 5.4mm≤LD≤9.4mm. It is understood that the line connecting the two opposing sides of the second flange 21 may pass through the axis of the valve head 20 connecting to the filter bottle 10 or be of equal length to the line passing through this axis. The inner diameter of the valve head 20 is the diameter of the interface where the valve head 20 connects to the filter bottle 10, presenting the second flange 21 with an inner circumference and an outer circumference. Thus, LD represents: from the direction of the filter bottle 10 toward the valve head 20, i.e., in a bottom view of the valve head 20, twice the minimum distance between the outer circumference and the inner circumference of the second flange 21. The value of LD is limited to between 5.4 mm and 9.4 mm, i.e., greater than or equal to 5.4 mm and less than or equal to 9.4 mm. This ensures the structural strength of the second flange 21 on the valve head 20 and prevents the second flange 21 from protruding too much, which would weaken the structural stability of the second flange 21 on the valve head 20, thereby ensuring the stability of the connection between the valve head 20 and the filter bottle 10. The structure of the first flange 11 is similarly similar to that of the second flange 21. Specifically, L can be 69.8mm, 70.8mm or 71.8mm, etc., and D can be 62.4mm, 63.4mm or 64.4mm, etc.

[0064] The present invention also provides a water system, which includes the aforementioned pre-filter. The specific structure of the pre-filter is described with reference to the above-mentioned embodiments. Since the present water system utilizes all of the technical solutions of all of the above-mentioned embodiments, it at least possesses all of the beneficial effects provided by the technical solutions of the above-mentioned embodiments, and therefore will not be described in detail here. The water system includes at least the relevant components from the pre-filter to the water supply terminal. For example, the water system may include household appliances such as water heaters, dishwashers, and water dispensers, as well as accessories such as water pipes for domestic water supply 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 valve head, wherein the valve head is provided with a water inlet and a water outlet; as well as The filter bottle is provided with a water filter cavity, the water filter cavity is connected to the water inlet and the water outlet, and the filter bottle is connected to the valve head through a fastener.

2. The prefilter according to claim 1, wherein There are a plurality of fasteners, which are evenly distributed along the periphery of the filter bottle or the valve head.

3. The prefilter according to claim 1, wherein: The fasteners include bolts, and the filter bottle and the valve head are connected by the bolts.

4. The prefilter according to claim 3, characterized in that The fastener further includes a nut, and the bolt is threadedly connected to the corresponding nut.

5. The pre-filter according to claim 4, characterized in that The pre-filter is provided with a limiting groove, and the nut is limitedly installed in the limiting groove.

6. The prefilter according to claim 5, characterized in that The filter bottle is provided with a through hole for the bolt to pass through, and the limiting groove is provided with an avoidance notch on the side wall opposite to the through hole of the filter bottle, and the avoidance notch is used to avoid the bolt.

7. The pre-filter according to claim 3, characterized in that A through hole for the bolt to pass through is provided at the connection between the valve head and the filter bottle, and at least the through hole away from the head of the bolt is configured as a screw hole, and the screw hole is threadedly connected to the bolt.

8. The prefilter according to claim 1, wherein: A first flange is provided on the outer periphery of the filter bottle, and a second flange is provided on the outer periphery of the valve head. The first flange and the second flange are formed with a communicating through hole, and the fastener is passed through the through hole.

9. The prefilter according to claim 8, characterized in that The first flange and the second flange are respectively arranged around the outer circumference of the filter bottle and the valve head.

10. The pre-filter according to claim 8, characterized in that The first flange and the second flange are in contact with each other.

11. The prefilter according to claim 8, wherein The distance between the two opposite sides of the second flange is L, the inner diameter of the valve head is D, and L and D satisfy: 5.4 mm ≤ LD ≤ 9.4 mm.

12. The pre-filter according to claim 8, wherein The outer peripheries of the first flange and the second flange are polygonal or quasi-polygonal, and the through holes are located at corners of the first flange or the second flange.

13. The pre-filter according to claim 12, wherein: The corners of the first flange and / or the second flange are configured as rounded corners, and the center of the through hole and the center of the rounded corner are located at the same position.

14. The pre-filter according to claim 12, wherein: The outer peripheries of the first flange and the second flange are arranged in a square shape, and one through hole is correspondingly arranged at each of the four corners.

15. A water system, characterized in that: The method comprises the pre-filter according to any one of claims 1 to 14.

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