Pre-filter and water system

Abstract

The utility model discloses a pre-filter and a water system, and relates to the technical field of pre-filters, the pre-filter comprises a shell, the shell is provided with a water filtering cavity and a water inlet communicated with the water filtering cavity; the filter element is arranged in the water filtering cavity; the reversing piece is movably inserted into the filter element, the reversing piece comprises a switching section and a hollow pipe section which are sequentially connected in the axial direction, the switching section comprises a communicating part and a blocking part, water spraying holes are formed in the peripheral wall of the hollow pipe section, and spraying water flow facing the filter element can be formed at the water spraying holes; a flushing flow path between the water spraying hole and the water inlet is communicated through the communicating part and is cut off through the blocking part; according to the technical scheme provided by the utility model, the washing effect of the filter element in the pre-filter can be improved.

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] At present, 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. However, due to the unreasonable internal structure design of the pre-filter, the flushing effect on the filter element is weak. Utility Model Content

[0003] The main purpose of the utility model is to provide a pre-filter and a water system, aiming to improve the flushing effect of the filter element in the pre-filter.

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

[0005] The housing has a water filter cavity and a water inlet connected to the water filter cavity;

[0006] a filter element, disposed in the water filter cavity; and

[0007] A reversing member is movably inserted into the filter element, and the reversing member includes a switching section and a hollow pipe section connected in sequence along the axial direction. The switching section includes a connecting portion and a blocking portion. A water spray hole is provided on the peripheral wall of the hollow pipe section, and a water jet can be formed at the water spray hole toward the filter element. The flushing flow path between the water spray hole and the water inlet is connected through the connecting portion and cut off by the blocking portion.

[0008] In one embodiment, there are multiple water spray holes, and the multiple water spray holes include multiple first water spray holes arranged at intervals along the axial direction of the hollow pipe section, and the flow area of ​​the multiple first water spray holes becomes larger in the direction away from the water inlet.

[0009] In one embodiment, the plurality of first water spray holes are arranged to have a first axial width of the hollow pipe section that becomes larger in a direction away from the water inlet.

[0010] In one embodiment, a first width of the plurality of first water spray holes along the axial direction of the hollow tube section is greater than or equal to 0.8 mm and less than or equal to 2.0 mm.

[0011] In one embodiment, there are multiple water spray holes, and the multiple water spray holes include multiple second water spray holes arranged at intervals along the circumference of the hollow pipe segment, and the ratio of the total width of the multiple second water spray holes along the circumference of the hollow pipe segment to the circumference of the hollow pipe segment is less than or equal to 1 / 2.

[0012] In one embodiment, the ratio of the total width of the plurality of second water spray holes along the circumference of the hollow pipe section to the circumference of the hollow pipe section is greater than or equal to 1 / 4.

[0013] In one embodiment, the ratio of the total width of the plurality of second water spray holes along the circumference of the hollow pipe section to the circumference of the hollow pipe section is equal to 1 / 3.

[0014] In one embodiment, the plurality of second water spray holes are evenly spaced along the circumference of the hollow tube section.

[0015] In one embodiment, the water spray hole penetrates the peripheral wall of the hollow pipe section along a tangential direction of the inner peripheral surface of the hollow pipe section.

[0016] In one embodiment, the water spray hole is arranged in an arc shape in the penetrating direction.

[0017] In one embodiment, a rounded corner is formed on the arc-shaped inner circumference of the outer circumference of the hollow pipe section corresponding to the water spray hole.

[0018] In one embodiment, the inner circumference of the hollow tube section is formed with a plurality of arc segments corresponding to the water spray hole, and the plurality of arc segments are sequentially tangentially connected in the water outlet direction of the corresponding water spray hole, and the radius increases sequentially.

[0019] In one embodiment, the inner circumference of the hollow pipe section is formed with a first arc segment and a second arc segment corresponding to the water spray hole. The first arc segment and the second arc segment are tangentially connected in sequence in the water outlet direction of the corresponding water spray hole, and the radius increases successively. The central axis of the first arc segment is the central axis of the hollow pipe section.

[0020] In one embodiment, the radius of the first arc segment is 3 mm to 3.5 mm;

[0021] And / or, the radius of the second arc segment is 5 mm to 7 mm.

[0022] In one embodiment, the water spray hole is gradually expanded in a penetrating direction from the inside to the outside.

[0023] In one embodiment, the water spray hole penetrates the peripheral wall of the hollow pipe section along the radial direction of the hollow pipe section, the width of the water spray hole along the axial direction of the hollow pipe section remains unchanged, and the width of the water spray hole along the radial direction of the hollow pipe section is gradually expanded.

[0024] In one embodiment, a plurality of guide ribs are provided on the inner wall of the hollow tube section, and the plurality of guide ribs extend spirally along the axial direction of the hollow tube section.

[0025] The utility model also provides a water use system, comprising the pre-filter as described above.

[0026] The technical solution of the present utility model is to set a water filter chamber and a water inlet connected to the water filter chamber on the shell, and the filter element is arranged in the water filter chamber; the reversing member can be movably inserted into the filter element, and the reversing member includes a switching section and a hollow pipe section connected in sequence along the axial direction, the switching section includes a connecting part and a blocking part, and the peripheral wall of the hollow pipe section is provided with a water spray hole, and a jet of water can be formed at the water spray hole toward the filter element, and the flushing flow path between the water spray hole and the water inlet is connected through the connecting part and cut off by the blocking part.

[0027] In the flushing mode, the connecting part of the switching section can be connected with the water inlet, so that the water path in the water filter chamber can flow, and the blocking part can block the water flow from the water inlet from flowing directly to the filter element, thereby cutting off the filtration flow path in the water filter chamber, so that after the raw water enters from the water inlet, it enters the interior of the switching section through the circumferential porous structure of the connecting part, and then flows to the hollow pipe section. The hollow pipe section is provided with a water spray hole, and the water spray hole can form a jet water flow, which sprays water toward the filter element, thereby increasing the impact force of the water flow on the filter element and improving the flushing effect on the filter element. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] 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.

[0029] Figure 1 A cross-sectional view of an embodiment of a pre-filter provided by the present invention in filtering mode;

[0030] Figure 2 for Figure 1 Cross-sectional view of the pre-filter in flushing mode;

[0031] Figure 3 for Figure 1 A schematic structural diagram of a commutator at one angle;

[0032] Figure 4 for Figure 1 A schematic structural diagram of the commutator from another angle;

[0033] Figure 5 for Figure 1 A cross-sectional view of the commutator along its axial direction;

[0034] Figure 6 for Figure 1 A cross-sectional view of the commutator along its circumferential direction;

[0035] Figure 7 This is a schematic structural diagram of an angle of a reversing member of another embodiment of a pre-filter provided by the present utility model;

[0036] Figure 8 for Figure 7 A schematic structural diagram of the commutator from another angle;

[0037] Figure 9 for Figure 8 A cross-sectional view of the switching member along its circumferential direction.

[0038] Description of Figure Numbers:

[0039] 1. Pre-filter; 10. Filter bottle; 101. Water filter chamber; 102. Sewage outlet; 20. Valve head; 201. Water inlet; 202. Water outlet; 22. Metal shell; 23. Plastic lining; 30. Filter element; 720. Reversing member; 721. Connecting part; 722. Blocking part; 723. Hollow pipe section; 7231. Water spray hole; 7232. Rounded corner; 7233. First arc segment; 7234. Second arc segment; 7235. First water spray hole; 7236. Second water spray hole; 730. Suction cup.

[0040] 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

[0041] 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.

[0042] 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.

[0043] 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.

[0044] The present invention proposes a pre-filter 1, the interior of which can realize the switching of the internal flow channel, so that the filter element 30 inside can be cleaned regularly to discharge the large particulate matter previously intercepted, thereby eliminating the need for manual disassembly and cleaning of the pre-filter 1, thereby improving the service life of the pre-filter 1.

[0045] Water systems, such as whole-house water purification systems, typically feature a pre-filter 1. This filter removes large particles from tap water, ensuring water safety for residents while also extending the lifespan of appliances, preventing clogs in household water pipes, and improving residents' health. The pre-filter 1 is the first coarse filtration device in the whole-house water purification system. The internal filter element 30, typically a stainless steel mesh, is a physical filter designed to intercept large particles larger than 40 microns, ensuring back-end water safety.

[0046] See also Figure 1 and Figure 2 In one embodiment of the present invention, the pre-filter 1 includes a housing having a water filter chamber 101 and a water inlet 201 connected to the water filter chamber 101. The housing is usually formed in two parts, so the housing includes a filter bottle 10 and a valve head 20 connected to the filter bottle 10. The water filter chamber 101 is at least provided in the filter bottle 10, and the water inlet 201 is provided in the valve head 20. The valve head 20 is also provided with a water outlet 202 and a sewage outlet 102 connected to the water filter chamber 101. The water inlet 201 is connected to the water supply end of the water use system, and the water outlet 202 is connected to the water use end of the water use system, thereby filtering the raw water flowing from the water supply end to the water use end. The sewage outlet 102 is used to discharge the water after cleaning the filter element 30.

[0047] 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.

[0048] The valve head 20 and the filter bottle 10 are primarily connected by a threaded connection. For example, the valve head 20 is provided with an externally threaded tube, and the mouth of the filter bottle 10 is provided with corresponding internal threads for threading the externally threaded tube. To reduce the production difficulty of the prefilter 1, lower the requirements for assembly testing, and reduce the material cost of the valve head 20, in this embodiment, the filter bottle 10 and valve head 20 are fastened together using fasteners.

[0049] The valve head 20 comprises a connected metal outer shell 22 and a plastic inner liner 23, with the water inlet 201 formed in the plastic inner liner 23. This ensures that water flowing through the pre-filter 1 directly contacts the plastic inner liner 23 rather than the metal outer shell 22. This prevents water contamination by metal elements precipitated from the metal outer shell 22 while also enhancing the aesthetics and housing strength of the pre-filter 1. In other embodiments, the valve head 20 can also be directly configured as a metal component.

[0050] The materials of the metal shell portion 22 and the plastic lining portion 23 are not specifically limited in this application. For example, the material of the metal shell portion 22 can be a copper alloy, such as brass, and the material of the plastic lining portion 23 can be PP (polypropylene) or PVC (polyvinyl chloride).

[0051] The pre-filter 1 also includes a filter element 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 element 30 for filtration. The filter element 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 element 30 are not limited, and the filter element 30 can be a stainless steel filter or a PP cotton filter.

[0052] The reversing member 720 can be movably inserted into the filter element 30, that is, the filter element 30 has a hollow structure extending along its axial direction for the reversing member 720 to pass through, so that the reversing member 720 can slide relative to the filter element 30 in the water filter chamber 101 to change the connectivity between different components in the water filter chamber 101, thereby changing the direction of water flow to switch between different working modes of the pre-filter 1.

[0053] The reversing member 720 includes a switching section and a hollow pipe section 723 connected in sequence along the axial direction. The switching section includes a connecting portion 721 and a blocking portion 722. The peripheral wall of the hollow pipe section 723 is provided with a water spray hole 7231. The water spray hole 7231 can form a jet of water toward the filter element 30. The flushing flow path between the water spray hole 7231 and the water inlet 201 is connected through the connecting portion 721 and cut off by the blocking portion 722.

[0054] Specifically, the reversing member 720 is configured as a hollow structure, and the switching section includes a connecting section, the connecting section has a circumferential hole structure, and the blocking portion 722 has the function of blocking the water flow. Figure 2 ), the connecting portion 721 of the switching section can be connected with the water inlet 201, so that the water path in the water filter chamber 101 can flow, and the blocking portion 722 can block the water flow from the water inlet 201 from flowing directly to the filter element 30, thereby cutting off the filtration flow path in the water filter chamber 101, so that after the raw water enters from the water inlet 201, it enters the interior of the switching section through the circumferential hole structure of the connecting portion 721, and then flows to the hollow pipe section 723, and the hollow pipe section 723 is provided with a water spray hole 7231, and the water spray hole 7231 can form a jet of water, which sprays water toward the filter element 30 to flush the filter element 30, and is finally discharged from the sewage outlet 102.

[0055] And because the water spray hole 7231 can form a jet of water toward the filter element 30, the water spray hole 7231 is often configured as a micropore provided on the peripheral wall of the hollow pipe section 723, so that the water flowing through the hollow pipe section 723 is accelerated due to the sudden contraction of the flow area when flowing out of the water spray hole 7231, thereby forming a jet of water.

[0056] Of course, the pre-filter 1 also has a filtering state (see Figure 1 ), the pre-filter 1 can be switched between the filtering mode and the flushing mode by the movement of the reversing member 720 relative to the filter element 30. For example, the reversing member 720 can move up and down relative to the filter element 30, so that the pre-filter 1 can be switched between the filtering mode and the flushing mode. There are multiple driving forces for driving the reversing member 720 to move up and down, such as an elastic member provided between the reversing member 720 and the filter element 30, which can make the reversing member 720 have an upward movement tendency, thereby maintaining the filtering mode; a suction cup 730 is connected to the lower end of the corresponding reversing member 720, and the sewage outlet 102 is provided below the water filter chamber 101. When the water inlet 201 and the sewage outlet 102 are opened, the water pressure can be used to provide a driving force to the suction cup 730, so that the suction cup 730 overcomes the elastic member. The elastic potential energy moves downward, thereby converting the filtering mode into the flushing mode; or the reversing member 720 is threadedly connected to the filter element 30 or the inner wall of the water filter chamber 101, and the reversing member 720 is driven to rotate by the driving structure, thereby moving the reversing member 720 up or down; or a telescopic structure is provided in the filter chamber, which can directly push or pull the reversing member 720 to move, thereby driving the reversing member 720 to move up or down; at this time, a guide structure needs to be provided between the reversing member 720 and the filter element 30.

[0057] Among them, the switching section and the hollow pipe section 723 are integrally formed, which not only facilitates the assembly of the reversing member 720, but also ensures the overall strength of the reversing member 720, and avoids the installation gap between the switching section and the hollow pipe section 723, which may cause the reversing member 720 to accidentally leak water and cause water flow disturbance. Of course, in other embodiments, the switching section and the hollow pipe section 723 are separately formed, such as the switching section and the hollow pipe section 723 are connected by snapping or bonding. Similarly, the connecting portion 721 and the baffle portion 722 are preferably integrally formed. In other embodiments, the connecting portion 721 and the baffle portion 722 are separately formed, such as the connecting portion 721 and the baffle portion 722 are connected by snapping or bonding.

[0058] In an embodiment of the present invention, there are multiple water spray holes 7231, and the multiple water spray holes 7231 include multiple first water spray holes 7235 arranged at intervals along the axial direction of the hollow pipe section 723, and the flow area of ​​the multiple first water spray holes 7235 is set to become larger in the direction away from the water inlet 201.

[0059] Specifically, at least one group of water spray holes 7231 is often spaced apart along the axial direction of the hollow tube section 723, and each group of water spray holes 7231 includes at least one water spray hole 7231 along the circumference of the hollow tube section 723. Furthermore, the multiple groups of water spray holes 7231 are sequentially arranged along the axial direction of the hollow tube section 723, that is, the water spray holes 7231 are arranged in a row along the axial direction of the hollow tube section 723. Therefore, it is temporarily assumed that the water spray holes 7231 spaced apart along the axial direction of the hollow tube section 723 are all first water spray holes 7235, and the water spray holes 7231 within each group of water spray holes 7231 are all second water spray holes 7236. The number of water spray holes 7231 is multiple, that is, the number of water spray holes 7231 is greater than or equal to 2, and if the number of water spray holes 7231 is 2, when two water spray holes 7231 are arranged at intervals along the axial direction of the hollow pipe section 723, two groups of water spray holes 7231 are provided on the hollow pipe section, and each group of water spray holes 7231 has one water spray hole 7231; when two water spray holes 7231 are arranged at intervals along the circumference of the hollow pipe section 723, a group of water spray holes 7231 is provided on the hollow pipe section, and each group of water spray holes 7231 has two water spray holes 7231.

[0060] Because the end of the filter element 30 close to the water inlet 201 is the first to come into contact with the raw water, the most impurities adhere to its surface during filtration. Therefore, the impact force of the jet water flow at the water spray hole 7231 at the end closest to the water inlet 201 is set to be the strongest, which helps to flush the water flow at the top of the filter element 30. Moreover, the amount of impurities in the filter element 30 gradually decreases in the direction away from the water inlet 201. Therefore, in order to better flush the filter element 30, improve the flushing effect of the filter element 30, and reduce unnecessary energy waste, the flow area of ​​the multiple first water spray holes 7235 is set to be larger in the direction away from the water inlet 201. The larger the flow area of ​​the first water spray hole 7235, the smaller the flow rate of the jet water flow at the corresponding first water spray hole 7235, and the smaller the impact force. Therefore, the flow area of ​​the multiple first water spray holes 7235 is set to be larger in the direction away from the water inlet 201, so that the flow rate of the impact water flow can be reasonably distributed according to the amount of impurities on the filter element 30.

[0061] There is a difference in the flow areas of two first water spray holes 7235 at adjacent positions, and the difference in the flow areas of two first water spray holes 7235 at multiple adjacent positions may be equal or unequal.

[0062] Furthermore, in the direction away from the water inlet 201, the plurality of first water spray holes 7235 are arranged along the first axial width of the hollow tube section 723 to become larger. Figure 5 , assuming that the axial width of the first water spray hole 7235 along the hollow pipe section 723 is a first width D1, by adjusting the first width D1 of the first water spray hole 7235 along the axial direction of the hollow pipe section 723, and then adjusting the flow area of ​​the first water spray hole 7235, it helps to control the difference ratio of multiple adjacent first water spray holes 7235, and on the other hand facilitates the processing of multiple first water spray holes 7235.

[0063] See also Figures 3 to 5 In the embodiment of the present invention, the first width D1 of the plurality of first water spray holes 7235 along the axial direction of the hollow tube section 723 is greater than or equal to 0.8 mm and less than or equal to 2.0 mm. Specifically, if the first width D1 of the first water spray holes 7235 along the axial direction of the hollow tube section 723 is greater than 2.0 mm, the area of ​​the first water spray holes 7235 is too large, making it difficult to form an impact water flow, which is not conducive to flushing the filter element 30. If the first width D1 of the first water spray holes 7235 along the axial direction of the hollow tube section 723 is less than 0.8 mm, the area of ​​the first water spray holes 7235 is too small, which is not conducive to the timely discharge of water from the hollow pipe, resulting in insufficient water flow when flushing the filter element 30 and inconvenient processing. Therefore, the first width D1 of the plurality of first water spray holes 7235 along the axial direction of the hollow tube section 723 is greater than or equal to 0.8 mm and less than or equal to 2.0 mm, which can ensure both the amount of flushing water for the filter element 30 and the flushing effect of the filter element 30.

[0064] Specifically, the first width D1 of the first water spray hole 7235 can be 0.8 mm, 1.0 mm, 1.3 mm, 1.5 mm, 1.7 mm, 2.0 mm, etc. In this embodiment, the hollow tube section 723 is provided with three groups of water spray holes 7231 along its axial direction, and the first width D1 of each group of water spray holes 7231 is 1.0 mm, 1.3 mm, and 1.5 mm, respectively, in a direction away from the water inlet 201.

[0065] See also Figure 6 In an embodiment of the present invention, there are multiple water spray holes 7231, and the multiple water spray holes 7231 include multiple second water spray holes 7236 arranged at intervals in the circumferential direction of the hollow pipe segment 723. The ratio of the total width of the multiple second water spray holes 7236 along the circumference of the hollow pipe segment 723 to the circumference of the hollow pipe segment 723 is less than or equal to 1 / 2.

[0066] Specifically, the two opposite ends of the circumference of the second water spray hole 7236 can form an angle a with the line connecting the axis of the hollow pipe section 723, and the ratio of the total width of the multiple second water spray holes 7236 along the circumference of the hollow pipe section 723 to the circumference of the hollow pipe section 723 is less than or equal to 1 / 2, that is, the ratio of the sum of the angles a of the multiple second water spray holes 7236 in each group of water spray holes 7231 to the circumferential angle of the hollow pipe section 723 is less than or equal to 1 / 2. If the ratio of the total width of the multiple second water spray holes 7236 along the circumference of the hollow pipe section 723 to the circumference of the hollow pipe section 723 is greater than 1 / 2, the second width D2 of the second water spray holes 7236 is too large, or the number of the second water spray holes 7236 in the circumference of the hollow pipe section 723 is too large, which not only affects the overall water flow impact strength of the group of water spray holes 7231, but is also not conducive to the local strength of the hollow pipe section 723. The hollow pipe section 723 may break at the second water spray holes 7236. Therefore, the ratio of the total width of the multiple second water spray holes 7236 along the circumference of the hollow pipe section 723 to the circumference of the hollow pipe section 723 is set to be less than or equal to 1 / 2, so as to ensure the overall water flow impact strength of the group of water spray holes 7231 and the local strength of the hollow pipe section 723.

[0067] Furthermore, the ratio of the total width of the plurality of second water spray holes 7236 along the circumference of the hollow pipe section 723 to the circumference of the hollow pipe section 723 is greater than or equal to 1 / 4, thereby ensuring sufficient water spraying volume of the second water spray holes 7236 .

[0068] Preferably, the ratio of the total width of the plurality of second water spray holes 7236 along the circumference of the hollow pipe section 723 to the circumference of the hollow pipe section 723 is equal to 1 / 3, thereby further ensuring the overall water flow impact strength of the group of water spray holes 7231 and the local strength of the hollow pipe section 723.

[0069] Please refer again Figure 6 In an embodiment of the present invention, a plurality of second water spray holes 7236 are evenly spaced along the circumference of the hollow pipe section 723, thereby improving the uniformity of the water flow impact of the group of water spray holes 7231 as a whole, helping to improve the uniformity of the flow rate of the overall impact water flow of the hollow pipe section 723, thereby improving the flushing effect of the hollow pipe section 723 on the filter element 30.

[0070] In one embodiment, the water spray hole 7231 is configured as a strip-shaped hole extending axially. This allows the width of the water spray hole 7231 to be designed to be relatively small, allowing water from the inner periphery of the hollow tube section 723 to be ejected through the water spray hole 7231. Furthermore, since the water spray hole 7231 extends axially, it helps ensure that the water spray hole 7231 covers the filter structure on the filter module, thereby ensuring the flushing effect of the filter module. Furthermore, it also helps to form a uniform axial spray flow, so that the filter structure is subjected to a uniform impact force in the axial direction, thereby ensuring the structural stability of the filter assembly. Of course, in other embodiments, multiple water spray holes 7231 may be provided, spaced apart along the axial direction.

[0071] Therefore, the ratio of the total width of the multiple water spray holes 7231 along the circumference of the hollow tube section 723 to the circumference of the hollow tube must be less than or equal to 1 / 2. Specifically, the width of the first connecting hole is 1mm to 2mm. That is, the width of the water spray hole 7231 along the circumference of the hollow tube section 723 is D3, 1mm≤D3≤2mm. In this way, it can be ensured that a water flow of appropriate intensity is stably ejected from the water spray hole 7231, and the filter module can be subjected to an impact force of appropriate size. While ensuring the flushing effect on the filter module, it is also beneficial to ensure the structural stability of the filter module. Of course, in other embodiments, under the premise of ensuring that a suitable jet of water can be formed, the width D3 of the water spray hole 7231 along the circumference of the hollow tube section 723 can also be less than 1mm or greater than 2mm.

[0072] Correspondingly, multiple water jet holes 7231 are also distributed circumferentially. This ensures that the sprayed water flow covers the filter structure circumferentially, thereby ensuring the flushing effect of the filter module. Furthermore, it also facilitates the formation of a uniform circumferential spray flow, so that the filter structure is evenly impacted in the axial direction, thereby ensuring the structural stability of the filter assembly.

[0073] In one embodiment, the water spray holes 7231 penetrate the circumferential wall of the hollow tube section 723 along a tangential direction of the inner circumference of the hollow tube section 723. This allows the water flow to be guided by the inner circumference of the hollow tube section 723, reducing resistance to the water flow and forming a swirling flow, thereby more thoroughly flushing the filter module. Of course, in other embodiments, the water spray holes 7231 may also penetrate the circumferential wall of the hollow tube section 723 in a radial direction.

[0074] In one embodiment, the water spray holes 7231 are arranged in an arc shape in the penetration direction. This can further enhance the effect of the swirl flow, thereby further enhancing the flushing effect of the filter module. Of course, in other embodiments, the water spray holes 7231 can also be arranged in a straight shape in the penetration direction.

[0075] Specifically, the outer circumference of the hollow tube section 723 is formed with a rounded corner 7232 on the inner side of the arc corresponding to the water spray hole 7231. This prevents the formation of a sharp structure here that affects the effect of the swirl flow. At the same time, the guiding effect of the rounded corner 7232 can further enhance the effect of the swirl flow, thereby ensuring the flushing effect of the filter module.

[0076] In one embodiment, the inner circumference of the hollow tube section 723 is formed with multiple arc segments corresponding to the water spray hole 7231. The multiple arc segments are sequentially connected tangentially in the water outlet direction of the corresponding water spray hole 7231, and the radius increases sequentially. That is, in the water outlet direction of the corresponding water spray hole 7231, the curvature of the multiple arc segments gradually decreases. In this way, the water flow can be gradually guided to be ejected from the water spray hole 7231 through the multiple arc segments, so that the outgoing water flow of the water spray hole 7231 can be transformed into a vortex flow, which is conducive to maintaining a certain centrifugal force of the water flow, making the outgoing water flow of the water spray hole 7231 more easily divergent, thereby ensuring comprehensive flushing of the filter module. In addition, the two connected arc segments are tangential to each other, which can avoid the formation of local losses that affect the formation of vortex flow. Furthermore, when multiple water spray holes 7231 are provided circumferentially around the hollow tube section 723, among the multiple arc segments corresponding to two adjacent communicating holes, the arc segment with the greatest curvature corresponding to one water spray hole 7231 will be positioned adjacent to the arc segment with the smallest curvature corresponding to the other water spray hole 7231, and both will be located near the preceding water spray hole 7231. However, the curvature difference between the two arc segments is significant, and water flow will not be directed to the arc segment corresponding to the succeeding water spray hole 7231, but will flow smoothly out through the preceding water spray hole 7231. In other embodiments, a gradually curvatured arc segment may be formed corresponding to each water spray hole 7231, i.e., the curvature of the arc segment gradually decreases as it approaches the corresponding water spray hole 7231.

[0077] Furthermore, the inner circumference of the hollow tube section 723 is formed with a first arc segment 7233 and a second arc segment 7234 corresponding to each of the water spray holes 7231. The first arc segment 7233 and the second arc segment 7234 are sequentially tangentially connected in the direction of water discharge from the corresponding water spray holes 7231, and their radii increase sequentially. The central axis of the first arc segment 7233 is the central axis of the hollow tube section 723. In other words, the curvature of the second arc segment 7234 is less than that of the first arc segment 7233, and the second arc segment 7234 is flatter than the first arc segment 7233. In this way, the first arc segment 7233 and the second arc segment 7234 form two distinct arc segments, ensuring the formation of a swirl flow. The first arc segment 7233 serves as the starting point for the water swirl, and its central axis is the central axis of the hollow tube section 723, which can better guide the water flow. Of course, in other embodiments, other numbers of arc segments, such as three or four, may be formed corresponding to one water spray hole 7231 .

[0078] The radius of the first arc segment 7233 is preferably between 3 mm and 3.5 mm, and the radius of the second arc segment 7234 is preferably between 5 mm and 7 mm. That is, the radius of the first arc segment 7233 is greater than or equal to 3 mm and less than or equal to 3.5 mm, and the radius of the second arc segment 7234 is greater than or equal to 5 mm and less than or equal to 7 mm. In this way, the first arc segment 7233 and the second arc segment 7234 can have appropriate curvatures to form a good guiding effect on the water flow, thereby ensuring the formation of a vortex of sufficient intensity. Of course, in other embodiments, the radius of the first arc segment 7233 can also be less than 3 mm or greater than 3.5 mm, and the radius of the second arc segment 7234 can also be less than 5 mm or greater than 7 mm.

[0079] In one embodiment, the water spray holes 7231 are gradually expanded from the inside out. This increases the pressure of the water jet, thereby improving the flushing effect of the water on the filter module. Of course, in other embodiments, the water spray holes 7231 may also be gradually contracted and expanded from the inside out, which is beneficial for increasing the flow rate of the water.

[0080] The water spray hole 7231 can penetrate the peripheral wall of the hollow pipe section 723 along the tangential direction of the hollow pipe section 723. At this time, the axial direction of the water spray hole 7231 is set at an angle to the radial direction of the hollow pipe section 723, so the gradually expanding direction of the water spray hole 7231 is also set at an angle to the hollow pipe section 723. In another embodiment, the water spray hole 7231 can also penetrate the peripheral wall of the hollow pipe section 723 along the radial direction of the hollow pipe section 723, that is, the water spray hole 7231 is set away from the hollow pipe section 723. The opening in the axial direction of the hollow pipe section 723 is set to gradually become larger. On the one hand, it is convenient for the processing of the water spray hole 7231 (the hollow pipe section 723 is generally formed by integral injection molding, and the water spray hole 7231 is formed by pre-setting a core in the mold. Therefore, the water spray hole 7231 is set to a gradually enlarged hole to facilitate the demolding of the hollow pipe section 723). On the other hand, the thickness of the water spray hole 7231 at the smallest flow area is thinner, which can reduce the resistance to the water flow and help form a jet of water.

[0081] When the water spray hole 7231 also penetrates the peripheral wall of the hollow tube section 723 in the radial direction of the hollow tube section 723, in order to further facilitate the processing of the water spray hole 7231, in an embodiment of the present invention, the width of the water spray hole 7231 along the axial direction of the hollow tube section 723 remains unchanged, and the width of the water spray hole 7231 along the radial direction of the hollow tube section 723 gradually expands. Specifically, the width of the water spray hole 7231 along the axial direction of the hollow tube section 723 is set as a first width D1, and the width of the water spray hole 7231 along the radial direction of the hollow tube section 723 is set as a second width D2. The first width D1 of the water spray hole 7231 remains unchanged, and the second width D2 of the water spray hole 7231 gradually expands. In other words, the water spray hole 7231 is configured in a rectangular trumpet shape, thereby facilitating the processing of the water spray hole 7231. In other implementations, the water spray hole 7231 may also gradually expand along the first axial width D1 of the hollow tube section 723, and the second radial width D2 of the water spray hole 7231 may remain unchanged; or the water spray hole 7231 may be configured as a circular trumpet shape.

[0082] In the embodiment of the present invention, the inner wall of the hollow tube section 723 is provided with a plurality of guide ribs, which extend in a spiral manner along the axial direction of the hollow tube section 723. Specifically, the plurality of guide ribs extend in a spiral manner along the axial direction of the hollow tube section 723. The guide ribs can further guide the water flowing into the hollow tube section 723, so that the water entering the hollow tube section 723 flows in a spiral manner within the hollow tube section 723, thereby further accelerating the flow rate of the water flow, thereby increasing the impact strength of the water jetted at the water spray hole 7231, and thus helping to improve the flushing effect on the filter element 30.

[0083] The present invention also provides a water system, which includes a prefilter 1. The specific structure of the prefilter 1 is similar to that of the above-mentioned embodiments. Since the present water 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 in detail here. The water system includes at least the relevant components from the prefilter 1 to the water supply end. For example, the water system may include household appliances such as water heaters, dishwashers, and water dispensers, and may also include auxiliary components such as water pipes for domestic water supply throughout the house.

[0084] 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 housing has a water filter cavity and a water inlet connected to the water filter cavity; A filter element is arranged in the water filter cavity; as well as A reversing member is movably inserted into the filter element, and the reversing member includes a switching section and a hollow pipe section connected in sequence along the axial direction. The switching section includes a connecting portion and a blocking portion. A water spray hole is provided on the peripheral wall of the hollow pipe section, and a water jet can be formed at the water spray hole toward the filter element. The flushing flow path between the water spray hole and the water inlet is connected through the connecting portion and cut off by the blocking portion.

2. The prefilter according to claim 1, wherein There are multiple water spray holes, and the multiple water spray holes include multiple first water spray holes arranged at intervals along the axial direction of the hollow pipe section, and the flow areas of the multiple first water spray holes become larger in the direction away from the water inlet.

3. The prefilter according to claim 2, wherein: In a direction away from the water inlet, the plurality of first water spray holes are arranged to have a first axial width of the hollow pipe section that becomes larger.

4. The prefilter according to claim 2, wherein: A first width of the plurality of first water spray holes along the axial direction of the hollow tube section is greater than or equal to 0.8 mm and less than or equal to 2.0 mm.

5. The prefilter according to claim 1, wherein: There are multiple water spray holes, and the multiple water spray holes include multiple second water spray holes arranged at intervals along the circumference of the hollow pipe section. The ratio of the total width of the multiple second water spray holes along the circumference of the hollow pipe section to the circumference of the hollow pipe section is less than or equal to 1 / 2.

6. The prefilter according to claim 5, characterized in that The ratio of the total width of the plurality of second water spray holes along the circumference of the hollow pipe section to the circumference of the hollow pipe section is greater than or equal to 1 / 4.

7. The pre-filter according to claim 5, characterized in that The ratio of the total width of the plurality of second water spray holes along the circumference of the hollow pipe section to the circumference of the hollow pipe section is equal to 1 / 3.

8. The pre-filter according to claim 5, characterized in that The plurality of second water spray holes are evenly spaced and arranged along the circumference of the hollow pipe section.

9. The prefilter according to claim 1, wherein: The water spray hole penetrates the peripheral wall of the hollow pipe section along the tangential direction of the inner peripheral surface of the hollow pipe section.

10. The pre-filter according to claim 1, wherein: The water spray holes are arranged in an arc shape in the penetrating direction.

11. The prefilter according to claim 10, wherein: The outer circumference of the hollow pipe section is formed with a rounded corner on the arc-shaped inner circumference side corresponding to the water spray hole.

12. The pre-filter according to claim 1, wherein The inner circumference of the hollow pipe section is formed with a plurality of arc segments corresponding to the water spray hole. The plurality of arc segments are sequentially tangently connected in the water outlet direction of the corresponding water spray hole, and the radius increases sequentially.

13. The pre-filter according to claim 1, wherein: The inner circumference of the hollow pipe section is formed with a first arc segment and a second arc segment corresponding to the water spray hole. The first arc segment and the second arc segment are tangentially connected in sequence in the water outlet direction of the corresponding water spray hole, and the radius increases successively. The central axis of the first arc segment is the central axis of the hollow pipe section.

14. The pre-filter according to claim 13, wherein: The radius of the first arc segment is 3 mm to 3.5 mm; And / or, the radius of the second arc segment is 5 mm to 7 mm.

15. The pre-filter according to claim 1, wherein The water spray hole is gradually expanded in the penetrating direction from the inside to the outside.

16. The pre-filter according to claim 15, characterized in that The water spray hole penetrates the peripheral wall of the hollow pipe section along the radial direction of the hollow pipe section. The width of the water spray hole along the axial direction of the hollow pipe section remains unchanged, and the width of the water spray hole along the radial direction of the hollow pipe section is gradually expanded.

17. The prefilter according to any one of claims 1 to 16, characterized in that The inner wall of the hollow pipe section is provided with a plurality of guide ribs, and the plurality of guide ribs extend spirally along the axial direction of the hollow pipe section.

18. A water system, characterized in that: Comprising the pre-filter according to any one of claims 1 to 17.

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