Filtration unit and dishwasher

Abstract

To provide a filtration unit for a dishwasher capable of improving in filtration effect.SOLUTION: A filtration unit for a dishwasher 4 includes: a flat filter with an inner periphery thereof having an opening and an outer periphery thereof having a porous structure 12; a cylindrical filter 2 fitted into the opening and surrounded by the flat filter; a water tank 3 arranged on an outer periphery of the cylindrical filter 2, and having one end connected to the flat filter, and formed with a water flow passage communicating with the porous structure 12 in a space between itself and the cylindrical filter 2; and a projecting part 4 disposed to surround the outer periphery of the cylindrical filter 2 and projecting outwards or disposed to surround an inner periphery of the water tank 3 and projecting inwards, and making the water flow passage form an annular constricted part 5 in the projecting part 4.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present disclosure relates to the field of filtration equipment and cleaning devices, and specifically to a filtration unit and a dishwasher having the filtration unit.

Background Art

[0002] With the continuous improvement of living standards, dishwashers have become more and more widely used. A dishwasher comprises a washing chamber, in which a dish rack and a shower arm are installed. After a user places unwashed dishes on the dish rack, the shower arm sprays washing water to clean the dishes, thereby realizing the washing of dishes by the dishwasher.

[0003] A dishwasher is usually provided with a filtration unit for filtering sewage. After sewage is filtered by the filtration unit, it can continue to be reused as washing water for washing dishes, thus realizing the cyclic utilization of washing water, saving water consumption and reducing the use cost for users.

[0004] A filtration unit in the prior art comprises a cylindrical filter and a planar filter arranged surrounding the cylindrical filter, as disclosed in, for example, the specification of Chinese Patent CN204708799U, and both the planar filter and the cylindrical filter can function to filter sewage after washing.

Prior Art Literature

Patent Literature

[0005]

Patent Literature 1

Summary of the Invention

Problem to be Solved by the Invention

[0006] However, in conventional filtration units, the load of the washing water during filtration is mainly concentrated on the flat filter; that is, a relatively large amount of washing water passes through the flat filter, while a relatively small amount passes through the cylindrical filter. Because the filtration accuracy of the flat filter is lower than that of the cylindrical filter, when the washing water enters the water tank from the washing chamber, the contaminants filtered by the flat filter during the washing process are scattered and cannot be effectively collected, thus affecting the final washing effect of the dishwasher.

[0007] Therefore, the problem to be solved is how to provide a filtration unit that can effectively distribute the load of washing water and thereby improve the filtration effect. [Means for solving the problem]

[0008] The filtration unit for a dishwasher in this disclosure includes a planar filter having an opening on its inner circumference and a porous structure on its outer circumference, a cylindrical filter fitted into the opening and surrounded by the planar filter, and a water tank covering the outer circumference of the cylindrical filter and connected at one end to the planar filter, with a water channel forming between it and the cylindrical filter that communicates with a porous structure. The filtration unit for a dishwasher further includes a projection that is installed so as to surround the outer circumference of the cylindrical filter and protrudes outward, or a projection that is installed so as to surround the inner circumference of the water tank and protrudes inward, the projection forming an annular constriction in the water channel.

[0009] The dishwasher in this disclosure includes a washing chamber on which dishes are placed, and a filtration unit for filtering the washing water after washing the dishes in the washing chamber, wherein the filtration unit is the filtration unit described above. [Effects of the Invention]

[0010] According to this disclosure, the filtration effect of a filtration unit for a dishwasher can be improved. [Brief explanation of the drawing]

[0011] [Figure 1] Partial perspective view of a dishwasher in an embodiment of the present disclosure [Figure 2] Partial perspective view of the filtration unit in an embodiment of the present disclosure [Figure 3] Exploded view of the filtration unit in the embodiment of the present disclosure [Figure 4] Cross-sectional view of the filtration unit in the embodiment of the present disclosure [Figure 5] Partial enlarged view of Figure 4 [Modes for carrying out the invention]

[0012] The embodiments will be described in detail below with reference to the drawings. However, unnecessary details may be omitted. For example, detailed explanations of already well-known matters or redundant explanations of substantially identical configurations may be omitted.

[0013] The attached drawings and the following description are provided to enable those skilled in the art to fully understand this disclosure and are not intended to limit the subject matter described in the claims.

[0014] (Embodiment 1) Embodiment 1 will be described below with reference to Figures 1 to 5.

[0015] [1-1. Structure] This disclosure provides a filtration unit 100. Figure 1 is a partial perspective view of a dishwasher 200 in an embodiment of this disclosure. As shown in Figure 1, the filtration unit 100 is used in a dishwasher 200 to filter the wastewater formed after washing dishes. The filtration unit 100 is installed below the washing chamber of the dishwasher 200. In some other embodiments of this disclosure, the filtration unit 100 is not limited to installation in a dishwasher 200 of the type shown in Figure 1, but may be installed in other types of dishwashers 200, and is not specifically limited here.

[0016] FIG. 2 is a partial perspective view of a filtration unit 100 according to an embodiment of the present disclosure. As shown in FIG. 2, the filtration unit 100 further includes a planar filter 1 and a cylindrical filter 2, wherein the planar filter 1 and the cylindrical filter 2 individually filter sewage generated when washing tableware.

[0017] Specifically, the outer periphery of the planar filter 1 is a porous structure 12. It should be noted that the "outer periphery" mentioned herein does not particularly refer to the edge of the planar filter 1, but refers to a region from the opening 11 to the edge of the planar filter 1, for example, the position of the porous structure 12 shown in FIG. 2. The porous structure 12 in the present embodiment is composed of a large number of micropores (which cannot be shown in FIG. 2 because the pore diameter is quite small), and residues remaining after washing tableware with washing water cannot pass through the porous structure 12, thereby fulfilling the filtration function.

[0018] The inner periphery of the planar filter 1 has an opening 11. The cylindrical filter 2 is fitted into the opening 11 and surrounded by the planar filter 1. The cylindrical filter 2 includes a cylindrical coarse filter 21 and a cylindrical fine filter 22 covering the outer periphery of the cylindrical coarse filter 21. The cylindrical filter 2 has a water inlet 211 disposed corresponding to the opening 11 of the planar filter 1. The cylindrical coarse filter 21 performs a first-stage filtration on sewage flowing into the cylindrical filter 2 through the water inlet 211, and the water flow filtered by the cylindrical coarse filter 21 is then further filtered by the cylindrical fine filter 22. The water flow filtered by the cylindrical fine filter 22 is relatively cleaner, thereby effectively improving the filtration accuracy of the cylindrical filter 2.

[0019] Here, the terms "coarse" and "fine" in the cylindrical coarse filter 21 and the cylindrical fine filter 22 do not mean that the cylindrical coarse filter 21 is coarser than the cylindrical fine filter 22 in terms of structural shape, but refer to coarse filtration and fine filtration in terms of filtration capacity.

[0020] FIG. 3 is an exploded view of the filtration unit 100 according to an embodiment of the present disclosure. As shown in FIG. 3, both the cylindrical coarse filter 21 and the cylindrical fine filter 22 have through holes 6 in their side walls. Specifically, the through holes 6 include first through holes 212 and second through holes 222. The cylindrical coarse filter 21 has the first through holes 212, and the cylindrical fine filter 22 has the second through holes 222. The second through holes 222 are in communication with the water tank 3 (shown in FIG. 4). That is, the cleaning water that has entered the cylindrical filter 2 is filtered twice, and food residues in the cleaning water are sufficiently filtered and retained on the side wall portions of the cylindrical coarse filter 21 or the cylindrical fine filter 22, so that the filtered cleaning water can be recycled again.

[0021] FIG. 4 is a cross-sectional view of the filtration unit 100 according to an embodiment of the present disclosure. As shown in FIG. 4, the filtration unit 100 further includes a water tank 3. The water tank 3 is fitted around the outer periphery of the cylindrical filter 2, and one end of the water tank 3 is connected to the planar filter 1. After the planar filter 1 and the cylindrical filter 2 filter the water flow, the water flow is temporarily stored in the water tank 3, and is then subsequently used for washing dishes, thereby realizing the cyclic utilization of water resources, saving water consumption, and reducing the user's water use cost.

[0022] Furthermore, the porous structure 12 is in communication with the water tank 3. The water flow forms a water flow path a along the porous structure 12 of the planar filter 1 and the water tank 3 in sequence. The cylindrical filter 2 is in communication with the water flow path a via the through holes 6. The water flow forms an intermediate water path b along the cylindrical coarse filter 21, the cylindrical fine filter 22 and the water tank 3 in sequence.

[0023] FIG. 5 is a partial enlarged view of FIG. 4. As shown in FIG. 4 and FIG. 5, the protruding portion 4 is provided so as to surround the outer periphery of the cylindrical fine filter 22, and protrudes outward, so that an annular constricted portion 5 is formed at the protruding portion 4 in the water flow path a. In some other embodiments of the present disclosure, the protruding portion 4 is not necessarily provided on the cylindrical fine filter 22, and may be provided at other positions, for example, on the inner periphery of the water tank 3, and protrude inward.

[0024] By installing the protrusions 4 in a surrounding manner, the flow rate entering the water tank 3 along the water channel a is relatively reduced, while the flow rate entering the water tank 3 from the intermediate channel b is relatively increased. Since the filtration accuracy of the cylindrical filter 2 is higher, increasing the flow rate in the intermediate channel b is advantageous for filtering and collecting pollutants in the wastewater with the cylindrical filter 2 and preventing the pollutants from scattering.

[0025] The surface of the flat filter 1 is usually made larger to easily capture food residue in order to facilitate cleaning. However, in this case, the amount of cleaning water filtered by the flat filter 1 becomes too large, which tends to reduce the filtration efficiency. Therefore, by installing an annular constriction 5 to limit the amount of cleaning water flowing in from the surface of the flat filter 1, the flat filter 1 surface can be made larger to capture more food residue, while the amount of water flowing in from the surface of the flat filter 1 is limited, thus ensuring the filtration efficiency.

[0026] By installing the protrusion 4, the flowing water generates a constant-direction flow between the water tank 3 and the inlet of the washing pump (not shown), thereby promoting the effective collection of contaminants and enhancing the washing effect of the dishwasher 200. The water flow enters the water tank 3 via the washing chamber, then enters the washing pump through a fixed inlet connected to the water tank 3 and the washing pump, and then enters the washing chamber again via the washing pump, thereby achieving a circulating washing operation.

[0027] In this embodiment, the projection 4 expands the diameter of the cylindrical tight filter 22 outward by 0.5 to 11.5 mm, or reduces the diameter of the water tank 3 inward by 0.5 to 11.5 mm, forming an annular constriction 5, with a gap width of 0.1 to 15 mm. Actual experiments and tests have shown that the annular constriction 5 with a gap width of 0.1 to 15 mm forms a narrow channel in the water channel a, thereby effectively controlling the flow rate of the cleaning water passing through the planar filter 1. This makes it easier to adjust the flow rate of the cleaning water passing through the planar filter 1 and the cylindrical filter 2, respectively, and prevents excessive concentration of the cleaning water flow on the planar filter 1. As a result, both the amount of filtration and the filtration accuracy filtered by the planar filter 1 and the cylindrical filter 2 can be considered, which is advantageous for improving the filtration effect of the filtration unit 100.

[0028] In this embodiment, because the cross-sectional area of ​​the annular constriction 5 is smaller than the cross-sectional area of ​​the water inlet 211, a relatively narrow passage is formed in the annular constriction 5 within the water channel a, limiting the amount of cleaning water flowing from the water channel a to the water tank 3 through the planar filter 1. This amount is less than the amount of cleaning water flowing from the water inlet 211 of the cylindrical filter 2 to the water tank 3, allowing the cylindrical filter 2 to filter more cleaning water than the planar filter 1. Furthermore, since the cylindrical filter 2 has higher filtration accuracy than the planar filter 1, it guarantees the filtration amount of the filtration unit 100 while also improving filtration accuracy, which is advantageous for enhancing the overall filtration effect of the filtration unit 100.

[0029] In this embodiment, a trumpet-shaped structure 221 is formed at one end of the cylindrical tight filter 22 closer to the planar filter 1. The diameter of the trumpet-shaped structure 221 expands along the direction opposite to the planar filter 1, gradually reducing the gap between the cylindrical tight filter 22 and the water tank 3, i.e., the cross-sectional area of ​​the water flow path a, along the direction of the flow of the cleaning water. This reduces the flow rate and filtration amount of cleaning water flowing into the water tank 3 through the planar filter 1, and correspondingly increases the flow rate and filtration amount of cleaning water passing through the cylindrical filter 2. Since the filtration accuracy of the cylindrical filter 2 is higher, the overall filtration accuracy of the filtration unit 100 is improved.

[0030] Furthermore, a tip section 31 is installed at one end where the water tank 3 and the planar filter 1 are connected. The diameter of the tip section 31 decreases as it moves away from the planar filter 1. The position of the projection 4 corresponds to the smallest part of the diameter of the tip section 31, that is, the position of the annular constriction 5 corresponds to the smallest part of the diameter of the tip section 31. This ensures the original filtration effect and also avoids a decrease in structural strength due to the projection 4 being too long, thus improving overall stability.

[0031] In this embodiment, the projection 4 is a completely continuous annular projection, installed to continuously surround the entire outer circumference of the cylindrical filter 2 and projecting outward, or installed to surround the entire inner circumference of the water tank 3 and projecting inward, so that the annular constriction 5 can be uniformly formed, thereby effectively reducing the amount of washing water coming from all directions of the planar filter 1.

[0032] In some other embodiments of this disclosure, the projection 4 is not limited to a complete annular projection structure, but may be a partially discontinuous annular projection. Furthermore, a partially discontinuous annular projection can form an annular constriction 5 in the water channel a with partially varying cross-sectional areas of the flow path, and a partially discontinuous annular projection can be realized by installing or not installing arc-shaped projections on a part of the outer circumference of the cylindrical filter 2 or the inner surface of the water tank 3. The annular constriction 5 formed by the partially discontinuous annular projection is formed with partially varying cross-sectional areas of the flow path within the water channel a, so that food debris can pass through in the parts of the flow path with relatively large cross-sectional areas, preventing food debris mixed in the washing water from clogging the annular constriction 5 and reducing the amount of washing water passing through the planar filter 1 too much, thereby preventing an impact on the overall filtration effect of the filtration unit 100. Furthermore, since the specific structural form of the protrusion 4 can be changed depending on the specific usage scenario of the filtration unit 100, this is advantageous in improving the applicability and flexibility of the filtration unit 100.

[0033] In this embodiment, the projection 4 and the cylindrical airtight filter 22 are integrally molded, and integral molding is advantageous for reducing manufacturing costs because it is easier to process and manufacture. In some other embodiments of this disclosure, the projection 4 and the cylindrical airtight filter 22 can also be manufactured by separately manufacturing them and then connecting them, and this is not specifically limited here.

[0034] Those skilled in the art will understand that specific technical features in each embodiment can be appropriately divided or combined. Such divisions or combinations of specific technical features do not result in the technical methods departing from the principles of this disclosure, so all divided or combined technical methods fall within the scope of this disclosure. In the description of this application, “multiple” means two or more unless otherwise clearly and specifically limited.

[0035] The foregoing are merely preferred embodiments of the Disclosure and are not intended to limit the Disclosure. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the Disclosure shall be within the scope of the Disclosure.

[0036] [1-3. Effects, etc.] As described above, in this embodiment, the filtration unit 100 for the dishwasher 200 includes a flat filter 1 having an opening 11 on its inner circumference and a porous structure 12 on its outer circumference, a cylindrical filter 2 fitted into the opening 11 and surrounded by the flat filter 1, and a water tank 3 covering the outer circumference of the cylindrical filter 2 and connected at one end to the flat filter 1, with a water channel forming between the water tank 3 and the cylindrical filter 2 that communicates with the porous structure 12. Furthermore, the filtration unit includes a projection 4 that is installed so as to surround the outer circumference of the cylindrical filter 2 and protrudes outward, or that is installed so as to surround the inner circumference of the water tank 3 and protrudes inward, and the projection 4 forms an annular constriction 5 in the water channel. According to this embodiment, the flat filter 1 and the cylindrical filter 2 each perform filtration of the washing water, and the washing water can be used for washing dishes after being filtered by the flat filter 1 and the cylindrical filter 2, respectively. The filtered washing water is stored in the water tank 3, and the dishwasher 200 can use water from the water tank 3 when washing. This enables the recycling of washing water, saving water usage in the dishwasher 200 and lowering the user's operating costs. By installing the protrusion 4 and forming an annular constriction 5 in the water flow path, the amount of washing water flowing through the water flow path after passing through the flat filter 1 is reduced, preventing excessive concentration of the washing water flow into the flat filter 1. This allows for a more rational distribution of the washing water filtered by the flat filter 1 and the cylindrical filter 2, respectively, which is advantageous for improving the filtration efficiency of the filtration unit 100 as it allows for consideration of both filtration volume and filtration accuracy.

[0037] Furthermore, in this embodiment, the cylindrical filter 2 includes a cylindrical coarse filter 21 and a cylindrical tight filter 22 fitted around the outer circumference of the cylindrical coarse filter 21. According to this embodiment, the cylindrical coarse filter 21 performs a first stage of coarse filtration on the washing water flowing into the cylindrical filter 2, and the washing water filtered by the cylindrical coarse filter 21 is then further filtered by the cylindrical tight filter 22, thereby achieving two-stage filtration of the washing water. Two-stage filtration provides more thorough filtration of the washing water compared to one-stage filtration, thereby effectively improving the filtration accuracy and filtration effect of the cylindrical filter 2.

[0038] Furthermore, in this embodiment, a trumpet-shaped structure 221 is formed at one end of the cylindrical tight filter 22 closer to the planar filter 1, and the diameter of the trumpet-shaped structure 221 is expanded along the direction opposite to the planar filter 1. According to this embodiment, by gradually reducing the gap between the cylindrical tight filter 22 and the water tank 3, i.e., the cross-sectional area of ​​the water flow path, along the flow direction of the cleaning water, the flow rate and filtration amount of cleaning water flowing into the water tank 3 through the planar filter 1 can be reduced, and correspondingly, the flow rate and filtration amount of cleaning water passing through the cylindrical filter 2 can be increased. Since the filtration accuracy of the cylindrical filter 2 is higher, the overall filtration accuracy of the filtration unit 100 can be improved.

[0039] Furthermore, in this embodiment, the projection 4 expands the diameter of the cylindrical tight filter 22 outward by 0.5 to 11.5 mm, or reduces the diameter of the water tank 3 inward by 0.5 to 11.5 mm, forming an annular constriction 5, with a gap width of 0.1 to 15 mm in the annular constriction 5. According to this embodiment, a narrow flow path is formed in the water flow path portion of the annular constriction 5, which has a gap width of 0.1 to 15 mm, thereby effectively controlling the flow rate of the cleaning water passing through the planar filter 1. This makes it easier to adjust the flow rate of the cleaning water passing through the planar filter 1 and the cylindrical filter 2, respectively, and prevents excessive concentration of the cleaning water flow in the planar filter 1. As a result, both the amount of filtration and the filtration accuracy filtered by the planar filter 1 and the cylindrical filter 2 can be considered, which is advantageous for improving the filtration effect of the filtration unit 100.

[0040] Furthermore, in this embodiment, the projection 4 is integrally molded with the cylindrical airtight filter 22. This configuration facilitates processing and manufacturing, which is advantageous for reducing manufacturing costs.

[0041] Furthermore, in this embodiment, both the cylindrical coarse filter 21 and the cylindrical tight filter 22 have through holes 6 in their side walls, and the cylindrical filters 2 communicate with the water flow path through the through holes 6. In this configuration, when the washing water enters the cylindrical filter 2, it first flows out from the first through hole 212 in the side wall of the cylindrical coarse filter 21, then flows out from the second through hole 222 in the side wall of the cylindrical tight filter 22, and finally enters the water flow path, waiting for further recycling. In other words, the washing water that enters the cylindrical filter 2 is filtered twice, and the food residue in the washing water is sufficiently filtered out and remains in the side wall portion of the cylindrical coarse filter 21 or cylindrical tight filter 22, so that the filtered washing water can be recycled again.

[0042] Furthermore, in this embodiment, the cylindrical filter 2 has an inlet 211 installed corresponding to the opening 11, and the cross-sectional area of ​​the annular constriction 5 is smaller than the cross-sectional area of ​​the inlet 211. According to this embodiment, because the cross-sectional area of ​​the annular constriction 5 is smaller than the cross-sectional area of ​​the inlet 211 of the cylindrical filter 2, a relatively narrow passage is formed in the annular constriction 5 in the water flow path, thereby limiting the amount of cleaning water flowing from the water flow path through the flat filter 1 to the water tank 3, and making it less than the amount of cleaning water flowing from the inlet 211 of the cylindrical filter 2 to the water tank 3, so that the cylindrical filter 2 can filter more cleaning water than the flat filter 1. Since the cylindrical filter 2 has higher filtration accuracy than the flat filter 1, it is advantageous for increasing the overall filtration effect of the filtration unit 100 because it guarantees the filtration amount of the filtration unit 100 while also improving filtration accuracy.

[0043] Furthermore, in this embodiment, the projection 4 is either a completely continuous annular projection or a partially discontinuous annular projection. A completely continuous annular projection is installed to continuously surround the entire outer circumference of the cylindrical filter 2 and project outward, or it is installed to surround the entire inner circumference of the water tank 3 and project inward. According to this embodiment, an annular constriction 5 can be uniformly formed throughout the entire annular water flow path, thereby effectively reducing the amount of cleaning water coming from each direction of the planar filter 1. Also, The partially discontinuous annular projections can form an annular constriction 5 in the water channel a with partially varying cross-sectional areas of the flow path, and by installing or not installing arc-shaped projections on a part of the outer circumference of the cylindrical filter 2 or the inner surface of the water tank 3, the partially discontinuous annular projections can be realized. The annular constriction 5 formed by these partially discontinuous annular projections is formed with partially varying cross-sectional areas of the flow path within the water channel a, so that food debris can pass through in the parts of the flow path with relatively large cross-sectional areas, preventing food debris mixed in the washing water from clogging the annular constriction 5 and reducing the amount of washing water passing through the flat filter 1 too much, thus preventing an impact on the overall filtration effect of the filtration unit 100. Furthermore, since the specific structural form of the projections 4 can be changed depending on the specific usage scenario, it is advantageous for improving the applicability and flexibility of the filtration unit 100.

[0044] Furthermore, in this embodiment, a tip section 31 is installed at one end where the water tank 3 and the planar filter 1 are connected. The tip section 31 has a diameter that decreases as it moves away from the planar filter 1, and the installation position of the projection 4 corresponds to the smallest part of the tip section 31's diameter. In this embodiment, the installation position of the projection 4 corresponds to the smallest part of the tip section 31's diameter, meaning that the position of the annular constriction 5 corresponds to the smallest part of the tip section 31's diameter. This ensures the original filtration effect while avoiding a decrease in structural strength due to the projection 4 being too long, which is advantageous for improving the overall processability and stability of the filtration unit 100.

[0045] Furthermore, in this embodiment, the dishwasher 200 includes a washing chamber for placing dishes and a filtration unit 100 for filtering the washing water after washing the dishes in the washing chamber, wherein the filtration unit 100 is the filtration unit 100 described in any of the above.

[0046] (Other embodiments) As described above, Embodiment 1 has been explained as an example of the technology disclosed in this application. However, the technology in this disclosure is not limited to this and can be applied to embodiments that have been modified, replaced, added, or omitted. Furthermore, it is possible to create new embodiments by combining the components described in Embodiment 1 above. [Industrial applicability]

[0047] This disclosure is applicable to dishwashers. [Explanation of Symbols]

[0048] 1 Planar filter 2. Cylindrical filter 3 Water Tanks 4 Protrusion 5. Ring-shaped constriction 6 Through hole 11 Opening 12 Porous structure 21. Cylindrical coarse filter 22 Cylindrical dense filter 31. Details 100 filtration units 200 Dishwashers 211 Water inlet 212 First through hole 221 Trumpet-shaped structure 222 Second through hole a Water flow path b Intermediate waterway

Claims

1. A planar filter having an opening on its inner circumference and a porous structure on its outer circumference, A cylindrical filter fitted into the aforementioned opening and surrounded by the planar filter, A filtration unit for a dishwasher includes a water tank which is fitted around the outer circumference of the cylindrical filter and has one end connected to the planar filter, and which has a water channel that communicates with the porous structure formed between it and the cylindrical filter, further, A projection is installed so as to surround the outer circumference of the cylindrical filter and protrudes outward, or a projection is installed so as to surround the inner circumference of the water tank and protrudes inward, and includes a projection that forms an annular constriction in the water flow path at the projection, The aforementioned protrusion is provided at a lower position than the planar filter. A filtration unit for dishwashers.

2. The cylindrical filter includes a cylindrical coarse filter and a cylindrical tight filter fitted around the outer circumference of the cylindrical coarse filter. A filtration unit for a dishwasher according to claim 1.

3. A trumpet-shaped structure is formed at one end of the cylindrical airtight filter closest to the planar filter, and the diameter of the trumpet-shaped structure is expanded in the direction opposite to the planar filter. A filtration unit for a dishwasher according to claim 2.

4. The projection expands the diameter of the cylindrical airtight filter outward by 0.5 to 11.5 mm, or reduces the diameter of the water tank inward by 0.5 to 11.5 mm, forming the annular constriction, and the gap width of the annular constriction is 0.1 to 15 mm. A filtration unit for a dishwasher according to claim 3.

5. The aforementioned protrusion is integrally molded with the cylindrical airtight filter. A filtration unit for a dishwasher according to claim 2.

6. Both the cylindrical coarse filter and the cylindrical dense filter have through holes in their side walls, and the cylindrical filters communicate with the water flow path through the through holes. A filtration unit for a dishwasher according to any one of claims 2 to 5.

7. The cylindrical filter has a water inlet installed corresponding to the opening, and the cross-sectional area of ​​the annular constriction is smaller than the cross-sectional area of ​​the water inlet. A filtration unit for a dishwasher according to claim 1.

8. The projection is either a completely continuous annular projection or a partially discontinuous annular projection. A filtration unit for a dishwasher according to claim 1.

9. A tip section is installed at one end of the connection between the water tank and the planar filter, and the diameter of the tip section decreases in the direction away from the planar filter, with the installation position of the projection corresponding to the smallest part of the diameter of the tip section. A filtration unit for a dishwasher according to claim 1.

10. A dishwasher comprising a washing chamber for placing dishes and a filtration unit for filtering the washing water after washing the dishes in the washing chamber, wherein the filtration unit is the filtration unit described in any one of claims 1 to 5 or 7 to 9. Dishwasher.

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