Filtering module, filtering assembly, pre-filter and water consumption system

Abstract

The utility model discloses a filtering module, a filtering assembly, a prefilter and a water system, and relates to the technical field of water systems, a water passing cavity is formed in the filtering module, and the filtering module is further provided with a first water passing opening and a second water passing opening which are communicated with the water passing cavity. The filtering module comprises a filtering piece arranged at the second water passing opening, and at least part of the filtering piece is obliquely arranged. According to the technical scheme provided by the utility model, the filtering area of the filtering module can be increased.

Description

Technical Field

[0001] This utility model relates to the field of water system technology, and in particular to a filter module, filter assembly, pre-filter and water system. Background Technology

[0002] Currently, pre-filters are the first coarse filtration device for whole-house water supply. They can filter out sediment, rust, large particles, and other impurities from tap water, thus preventing the large amount of sediment and impurities generated in urban and residential water supply networks from causing harm to the human body. They also play a positive role in pre-protecting concealed pipes, faucets, plumbing, water heaters, boilers, central air conditioning, washing machines, dishwashers, coffee machines, and other water appliances (water purifiers, reverse osmosis systems, water dispensers).

[0003] However, the existing pre-filters have a cylindrical filter structure with a small filtration area, resulting in low filtration efficiency. Utility Model Content

[0004] The main objective of this invention is to provide a filter module, filter assembly, pre-filter, and water system, with the aim of increasing the filtration area of ​​the filter module.

[0005] To achieve the above objectives, the present invention proposes a filter module for use in a pre-filter. The filter module has a water passage cavity inside, and the filter module also has a first water passage and a second water passage that connect to the water passage cavity. The filter module includes a filter element disposed at the second water passage, and the filter element is at least partially inclined.

[0006] In one embodiment, the filter element is arranged in a ring-cone shape.

[0007] In one embodiment, the cone angle of the filter element ranges from 150° to 170°.

[0008] In one embodiment, the filter module includes a support frame, the water passage cavity is formed inside the support frame, the first water outlet is formed in the support frame, the support frame includes an inclined support portion, and the second water outlet is disposed in the inclined support portion.

[0009] In one embodiment, the support frame further includes a first ring portion and a second ring portion, and two inclined support portions are provided. The two inclined support portions are distributed along the axial direction of the second ring portion, and the first ring portion and / or the second ring portion are respectively connected to the two sides of the two inclined support portions. The water passage cavity is formed between the two inclined support portions.

[0010] In one embodiment, the inclined support portion has a plurality of spaced-apart second water inlets, and the filter element is disposed on the inclined support portion.

[0011] In one embodiment, the inclined support portion includes a plurality of support ribs spaced apart along the circumference, and a second water outlet is formed between every two adjacent support ribs. The first water outlet is located on the inner circumference of the first ring portion.

[0012] In one embodiment, the inclined support portion further includes a support ring, the support rib is connected to the first ring portion through the support ring, and the end face of the support ring abuts against the filter element.

[0013] In one embodiment, the two inclined support portions taper in opposite directions and are connected by the second ring portion.

[0014] In one embodiment, the first ring portion protrudes from the inclined support portion and extends in a direction away from the water passage cavity.

[0015] In one embodiment, the outer diameter of the second ring is larger than the outer diameter of the first ring, and the two inclined support portions are connected by the second ring.

[0016] In one embodiment, the inner diameter of the first ring portion ranges from 17 mm to 26 mm; and / or

[0017] The inner diameter of the second ring ranges from 36 mm to 52 mm.

[0018] In one embodiment, the outer diameter of the first ring portion ranges from 20 mm to 32 mm;

[0019] And / or the outer diameter of the second ring portion ranges from 38 mm to 60 mm.

[0020] This utility model also proposes a filter assembly, which includes multiple filter modules as described above, with adjacent filter modules connected through the first water inlet.

[0021] This utility model also proposes a pre-filter, which includes the above-mentioned filter components.

[0022] This utility model also proposes a water system, including the aforementioned pre-filter.

[0023] The technical solution of this utility model increases the filtration area of ​​the filter element by at least partially tilting it. Under the same axial height, the filtration area of ​​the filter element can be increased. Due to the increased filtration area, the filter element can withstand a larger flow load and improve filtration efficiency. Moreover, because the filtration area of ​​the filter element is large enough, even if a local area of ​​the filter element is blocked, the remaining area of ​​the filter element can continue to withstand a large flow load, which helps to extend the service life of the filter module, reduce the replacement frequency, and thus reduce maintenance costs. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 A first-view structural schematic diagram of an embodiment of the filtering module provided by this utility model;

[0026] Figure 2 A second-view structural schematic diagram of an embodiment of the filtering module provided by this utility model;

[0027] Figure 3 An exploded view of an embodiment of the filter module provided by this utility model;

[0028] Figure 4 An exploded structural diagram of the support frame of the filter module provided by this utility model;

[0029] Figure 5 A cross-sectional view of the filter module provided by this utility model;

[0030] Figure 6 A first-view structural schematic diagram of the support frame for the filter module provided by this utility model;

[0031] Figure 7 A second-view structural schematic diagram of the support frame for the filter module provided by this utility model;

[0032] Figure 8 A cross-sectional view of the support frame of the filter module provided by this utility model.

[0033] Explanation of icon numbers:

[0034] 300, Filter module; 310, Support frame; 311, Inclined support; 311c, Support ring; 312, First ring; 313, Second ring; 320, Filter element; 330, First water outlet; 340, Water passage cavity; 350, Second water outlet.

[0035] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0037] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0038] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0039] Water systems, such as whole-house water purification systems, typically include pre-filters. These pre-filters remove large particles from tap water, ensuring water safety, extending the lifespan of appliances, preventing pipe blockages, and improving residents' health. The pre-filter is the first coarse filtration stage in a whole-house water purification system; it's a physical filtration device primarily used to intercept large particles larger than 40 microns, protecting downstream water supply.

[0040] Some pre-filters on the market usually have a flushing function, that is, they can be cleaned regularly to remove large particles that have been intercepted, thereby extending the service life of the pre-filter.

[0041] The pre-filter includes a filter bottle and a valve head connected to the filter bottle. The filter bottle has a water filtration chamber, and the valve head has an inlet and an outlet that are connected to the water filtration chamber. The inlet is connected to the water supply end, and the outlet is connected to the water user end.

[0042] It should be noted that the water supply end can be a tap water pipe, a water tower, or a well water source, and the water consumption end can be a faucet, a shower head, or a drinking water outlet. This application does not make any specific restrictions on this.

[0043] Furthermore, the pre-filter also includes a filter module 300 disposed within the filtration chamber. When raw water (e.g., tap water or well water) flows into the inlet from an external water source, it is filtered by the filter module 300 as it flows through the filtration chamber, removing large particles. The filtered water then flows out of the pre-filter from the outlet and towards the point of use. In this way, coarse filtration of the raw water is achieved.

[0044] However, the existing pre-filter module 300 has a cylindrical filter structure with a small filtration area, resulting in low filtration efficiency.

[0045] Reference Figure 1 and Figure 2 Therefore, in order to solve the above problems, this utility model proposes a filter module 300. In one embodiment of this utility model, the filter module 300 is applied to a pre-filter. The filter module 300 has a water passage cavity 340 inside, and the filter module 300 also has a first water inlet 330 and a second water inlet 350 communicating with the water passage cavity 340. The filter module includes a filter element 320 disposed in the second water inlet 350, and the filter element 320 is at least partially inclined.

[0046] The technical solution of this utility model increases the filtration area of ​​the filter element 320 by at least partially tilting it relative to a planar design. This allows for a larger filtration area for the same axial height, enabling the filter element 320 to withstand greater flow loads and improve filtration efficiency. Furthermore, because the filtration area is sufficiently large, even if some areas of the filter element 320 become clogged, the remaining areas can continue to withstand a larger flow load, helping to extend the service life of the filter module, reduce replacement frequency, and thus lower maintenance costs.

[0047] Reference Figure 5It should be noted that the filtration flow path of the filter module 300 is as follows: Figure 5 As shown by the solid arrows, in the filtration flow path of the pre-filter, the second water inlet 350, the water passage 340, and the first water inlet 330 are distributed sequentially upstream and downstream. That is, when the pre-filter filters the water flow, the water flow in the filter chamber of the filter bottle passes through the second water inlet 350, the water passage 340, and the first water inlet 330 in sequence, and then flows into the water-using end from the first water inlet 330.

[0048] The flushing flow path of the filter module 300 includes a forward flushing flow path and a backflush flow path, such as... Figure 5 As shown by the dashed arrow, when the pre-filter is in the backwashing state, the water flow from the water end flows into the first water outlet 330, the water passage 340 and the second water outlet 350 in sequence, thereby backwashing and discharging the large particles intercepted on the filter element 320, thus improving the service life of the pre-filter.

[0049] Reference Figure 3 Furthermore, the filter element 320 is arranged in a ring shape, and the outer ring edge of the filter element 320 is located on one axial side of the inner ring edge of the filter element 320. That is, the inner ring edge and the outer ring edge are not at the same height in the axial direction. Under the condition of equal axial height, the filtration area of ​​the filter element 320 can be increased. This means that under the same flow rate, the filter element 320 of this solution can withstand a larger flow load and improve filtration efficiency. Moreover, since the filtration area of ​​the filter element 320 of this solution is large enough, even if a local area of ​​the filter element 320 is blocked, the remaining area of ​​the filter element 320 can continue to withstand a large flow load, which helps to extend the service life of the filter module 300, reduce the replacement frequency, and thus reduce maintenance costs.

[0050] Specifically, the filter element 320 is arranged in a ring shape, and the outer ring edge is located on one side of the axial direction of the inner ring edge; this increases the distance between the filter element and the surrounding environmental components or another filter module 300, thereby reducing the probability of clogging of the filter module 300. Moreover, it also helps to flush impurities off the filter element 320 during backwashing.

[0051] In one embodiment, the filter element 320 is in the shape of an annular cone, which facilitates the sliding of impurities off the surface of the filter element and reduces the likelihood of impurities clogging the filter element 320.

[0052] Furthermore, the outer surface of the filter element 320 is conical. The conical design facilitates uniform fluid distribution and smooth flow, reducing eddies and turbulence within the filter module 300 and lowering energy loss. The generatrix of this conical surface can be a straight line, or it can be a concave arc extending into the water passage cavity 340, or a convex arc extending outward from the water passage cavity 340.

[0053] In the second embodiment, the outer surface of the filter element 320 is a pyramidal surface; the cross-section of the pyramidal surface is polygonal, thereby increasing the filtration area of ​​the filter element 320.

[0054] Furthermore, at least one of the inner ring edge and the outer ring edge of the filter element 320 is provided with a first water inlet 330, and such a first water inlet 330 is simple to form and easy to manufacture.

[0055] In this embodiment, a first water inlet 330 is provided on both the inner and outer ring edges. Of course, this utility model is not limited to this. In other embodiments, a first water inlet 330 may be provided on only one ring edge, depending on the actual application environment.

[0056] It should be noted that in this application, the axial direction refers to the axial direction of the inner ring edge of the filter element 320, that is, the direction of the height of the cone surface of the filter element 320. The axial direction is equivalent to the direction of the perpendicular line drawn from the vertex of the cone surface to the bottom surface.

[0057] Reference Figure 7 Furthermore, the cone angle of the filter element 320 ranges from 150° to 170°. This range of cone angles provides a larger water passage space between the filter module 300 and the environmental component, thereby increasing the flow area of ​​the second inlet 350 while reducing the axial space occupied by the filter element 320 in the filter bottle. Moreover, when the filter assembly 30 of the pre-filter is constructed from multiple filter modules 300, this range of cone angles can provide a larger water passage space between two adjacent filter modules 300 or between the filter module 300 and the environmental component, while ensuring the filtration area of ​​the filter element 320, thereby improving the filtration efficiency of the filter assembly 30.

[0058] The cone angle of the filter element is denoted as α, specifically, 150°≤α≤170°.

[0059] In this embodiment, the cone angle of the filter element is 160°.

[0060] Reference Figure 7 and Figure 8 Optionally, the filter module 300 further includes a support frame 310, a water passage cavity 340 formed inside the support frame 310, a first water passage 330 formed in the support frame 310, the support frame 310 further includes an inclined support portion 311, a second water passage 350 disposed on the inclined support portion 311, and a filter element 320 disposed on the support frame 310 and corresponding to the second water passage 350. It can be understood that the support frame 310 can increase the support force of the filter module 300 on the filter element 320, and the second water passage 350 disposed on the support frame 310 can increase the water passage area of ​​the filter module 300, thereby improving the filtration efficiency of the filter module 300.

[0061] Furthermore, the filter element 320 is applied to the inclined support portion 311.

[0062] Optionally, the support frame 310 further includes a first ring portion 312 and a second ring portion 313. Two inclined support portions 311 are provided, and the two inclined support portions 311 are distributed along the axial direction. The first ring portion 312 and / or the second ring portion 313 are respectively connected to the two sides of the inclined support portions 311 in the axial direction. The water passage cavity 340 is formed between the two inclined support portions 311. The arrangement of the two inclined support portions 311 can increase the area of ​​the water passage of the filter module 300, thereby improving the filtration efficiency.

[0063] Reference Figure 4 and Figure 6 Optionally, the inclined support portion 311 forms a plurality of second water inlets 350 spaced apart circumferentially. A filter element 320 is disposed on the inclined support portion 311 and covers the inclined support portion 311. It can be understood that providing multiple second water inlets 350 can increase the water flow rate of the filter module 300, thereby improving filtration efficiency. Furthermore, providing an annular filter element 320 directly covering the inclined support portion 311 can increase the stability of the filter element 320's installation. Compared to a scheme where one filter element 320 is provided for each second water inlet 350, this reduces the installation process. Of course, this application is not limited to this; in other embodiments, the filter module 300 may also provide one filter element corresponding to each second water inlet 350.

[0064] Optionally, the inclined support portion 311 includes a plurality of circumferentially spaced support ribs, with a second water passage 350 formed between every two adjacent support ribs. The first water passage 330 is located on the inner circumference of the first ring portion 312. This support frame 310 is simple to form, and the support ribs can increase the strength of the inclined support portion 311 and reduce the probability of the inclined support portion 311 breaking when the water flow is too large. Of course, the present invention is not limited to this. In other embodiments, the inclined support portion 311 can also be configured as a conical plate, with a plurality of second water passages 350 formed on the conical plate.

[0065] Optionally, the inclined support portion 311 further includes a support ring, and the support rib is connected to the first ring portion 312 through the support ring 311c. The end face of the support ring 311c abuts against the filter element 320. It can be understood that by setting the support ring 311c and making the end face of the support ring 311c abut against the filter element 320, the installation stability of the filter element 320 near the edge of the first ring portion 312 can be increased.

[0066] Furthermore, an installation step is formed between the support ring 311c and the first ring portion 312, and the inner ring edge of the filter element 320 is installed on the installation step, which can improve the stability of the filter element 320 installation.

[0067] Optionally, the two inclined support portions 311 are tapered in opposite directions and connected by the second ring portion 313. This reduces the space occupied by the filter module 300 in the water filter chamber, thereby reducing the volume of the filter bottle. Of course, the present invention is not limited to this. In other embodiments, the two inclined support portions 311 are tapered in the direction of proximity.

[0068] Reference Figure 1 and Figure 2 Optionally, the first ring portion 312 protrudes from the inclined support portion 311, and the first ring portion 312 extends in a direction away from the water passage cavity 340. It can be understood that this can increase the distance between the end face of the first ring portion 312 and the inclined support portion 311. Since the second water passage 350 is provided on the inclined support portion 311, this can increase the distance between the second water passage 350 and the surrounding environmental components or another filter module 300, thereby reducing the probability of the second water passage 350 being blocked. Moreover, during backwashing, it is also beneficial to flush impurities off the filter element 320.

[0069] The two ends of the support rib are connected to the first ring 312 and the second ring 313 respectively, and the inner circumference of the first ring 312 of the support frame 310 is provided with a first water outlet 330.

[0070] Reference Figure 7 and Figure 8 Furthermore, the two inclined support portions 311 are connected by a second ring portion 313. The outer diameter of the second ring portion 313 is larger than the outer diameter of the first ring portion 312. This facilitates the installation of the support frame 310 and avoids the connection structure affecting the flow of water in the water passage 340. Moreover, the second ring portion 313 is located at the periphery of the filter module 300. Using two second ring portions 313 to connect the two inclined support portions 311 can improve the choice of connection method, such as bonding or welding. When the two inclined support portions 311 are connected by the first ring portion 312, if bonding or welding is used, a communication port needs to be opened on the second ring portion 313. This not only affects the area of ​​the connection surface and the stability of the connection, but also increases the processing technology, thereby reducing production efficiency. Of course, this utility model is not limited to this. In other embodiments, the two inclined support portions 311 can also be connected by the first ring portion 312.

[0071] Optionally, the inner diameter of the first ring portion 312 ranges from 17 mm to 26 mm; and / or the inner diameter of the second ring portion 313 ranges from 36 mm to 52 mm, which can ensure the flow area of ​​the filter module 300, thereby improving the filtration efficiency of the filter module 300.

[0072] Specifically, if the inner diameter of the first ring portion 312 is less than 17mm, since the first water outlet 330 is located on the inner circumference of the first ring portion 312, a small inner diameter will affect the diameter of the first water outlet 330, thus affecting its water passage area. If the inner diameter of the first ring portion 312 is greater than 26mm, while the inner diameter of the second ring portion 313 remains unchanged, the radial width of the inclined support portion 311 will decrease, thereby reducing the water passage area of ​​the second water outlet 350 and thus reducing the filtration efficiency. If the inner diameter of the second ring portion 313 is less than 36mm, while its inner diameter remains unchanged, the radial width of the inclined support portion 311 will decrease, thereby reducing the water passage area of ​​the second water outlet 350 and thus reducing the filtration efficiency. If the inner diameter of the second ring portion 313 is greater than 52mm, it will excessively occupy the radial space of the filter bottle.

[0073] The inner diameter of the first ring 312 is denoted as D1, that is, the range of the inner diameter of the first ring 312 is: 17mm≤D1≤26mm; the inner diameter of the second ring 313 is denoted as D2, that is, the range of the inner diameter of the second ring 313 is: 36mm≤D2≤52mm.

[0074] Furthermore, the outer diameter of the first ring portion 312 ranges from 20 mm to 32 mm; and / or the outer diameter of the second ring portion 313 ranges from 38 mm to 60 mm. It is understood that limiting the inner diameter of the first ring portion 312 to between 17 mm and 26 mm; and / or limiting the inner diameter of the second ring portion 313 to between 36 mm and 52 mm, and limiting the outer diameter of the first ring portion 312 to between 20 mm and 32 mm; and / or limiting the outer diameter of the second ring portion 313 to between 38 mm and 60 mm, ensures the thickness of the first ring portion 312 and the second ring portion 313, thereby improving the strength of the first ring portion 312 and the second ring portion 313.

[0075] The outer diameter of the first ring 312 is denoted as D3, that is, the range of the outer diameter of the first ring 312 is: 20mm≤D3≤32mm; the outer diameter of the second ring 313 is denoted as D4, that is, the range of the outer diameter of the second ring 313 is: 38mm≤D4≤60mm.

[0076] This utility model also proposes a filter assembly, which includes multiple filter modules. The specific structure of the filter module is as described in the above embodiments. Since this filter assembly adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0077] This utility model also proposes a pre-filter, which includes a filter assembly. The specific structure of the filter assembly is as described in the above embodiments. Since this pre-filter adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0078] This utility model also proposes a water system, which includes a pre-filter. The specific structure of the pre-filter is as described in the above embodiments. Since this water system adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The water system includes at least related components from the pre-filter to the water outlet. For example, the water system may include household appliances such as water heaters, dishwashers, and water dispensers, or auxiliary components such as water pipes for domestic water use throughout the house.

[0079] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A filter module, applied to a pre-filter, characterized in that, The filter module has a water passage cavity inside, and the filter module also has a first water passage and a second water passage that connect to the water passage cavity. The filter module includes a filter element disposed at the second water passage, and the filter element is at least partially inclined.

2. The filtering module as described in claim 1, characterized in that, The filter element is arranged in a ring-cone shape.

3. The filtering module as described in claim 2, characterized in that, The cone angle of the filter element ranges from 150° to 170°.

4. The filtering module as described in claim 1, characterized in that, The filtration module includes a support frame, the water passage cavity is formed inside the support frame, the first water inlet is formed in the support frame, the support frame includes an inclined support portion, and the second water inlet is disposed in the inclined support portion.

5. The filtering module as described in claim 4, characterized in that, The support frame also includes a first ring and a second ring. There are two inclined support portions, which are distributed along the axial direction of the second ring. The first ring or the second ring is connected to the two sides of the two inclined support portions respectively. The water passage cavity is formed between the two inclined support portions.

6. The filtering module as described in claim 5, characterized in that, The inclined support portion has multiple spaced-apart second water inlets, and the filter element is disposed on the inclined support portion.

7. The filtering module as described in claim 6, characterized in that, The inclined support portion includes a plurality of support ribs spaced apart along the circumference, and a second water outlet is formed between every two adjacent support ribs. The first water outlet is located on the inner circumference of the first ring portion.

8. The filtering module as described in claim 7, characterized in that, The inclined support portion further includes a support ring, and the support rib is connected to the first ring portion through the support ring. The end face of the support ring abuts against the filter element.

9. The filtering module as described in claim 5, characterized in that, The two inclined support portions taper in opposite directions and are connected by the second ring portion.

10. The filtering module as described in claim 9, characterized in that, The first ring protrudes from the inclined support portion and extends in a direction away from the water passage cavity.

11. The filtering module as described in claim 5, characterized in that, The outer diameter of the second ring is larger than the outer diameter of the first ring, and the two inclined support portions are connected by the second ring.

12. The filtering module as described in claim 11, characterized in that, The inner diameter of the first ring ranges from 17 mm to 26 mm; and / or The inner diameter of the second ring ranges from 36 mm to 52 mm.

13. The filtering module as described in claim 12, characterized in that, The outer diameter of the first ring portion ranges from 20 mm to 32 mm; And / or the outer diameter of the second ring portion ranges from 38 mm to 60 mm.

14. A filter assembly, characterized in that, It includes multiple filter modules as described in any one of claims 1 to 13, with adjacent filter modules connected through the first water inlet.

15. A pre-filter, characterized in that, The pre-filter includes the filter assembly as described in claim 14.

16. A water supply system, characterized in that, Includes the pre-filter as described in claim 15.

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