A FILTERING ELEMENT FOR A DISHWASHER

Abstract

The invention relates to a pre-filter element (30) for a dishwasher sump assembly (10) comprising a flat metal plate (30) and a central opening (36) with a diameter of at least 100 mm, adjusted to accommodate the passage of dirty dish liquid through the center of the plate (30). In the pre-filter element, the thickness of the flat metal plate (30) is selected in the range of 0.30 - 0.40 mm, its surface contains a porous section (34) with multiple holes with diameters in the range of 0.30 mm - 0.60 mm, and the porous section (34) is adjusted to surround at least partially a central opening (36).

Description

1 TARIFF A pre-filtering element for a dishwasher. TECHNICAL AREA 5 The invention relates to a dishwasher housing that fits into a sump assembly at the base of the dishwasher washing drum. This relates to the pre-filtering element of the machine. STATE OF THE ART The reservoir in dishwashers is used to collect and filter washing water. various filter mechanisms mounted on the crankcase located at the base These systems typically use multiple filters such as coarse filters, fine filters, and ultrafilters. It contains the following components: A fine filter located at the bottom of the dishwasher washing drum. It is positioned to direct the water into the water reservoir in the sump. The coarse filter is 15 inches from the fine filter. It is located on top and has relatively large holes to trap larger dirt particles. It has an ultrafilter, which is a structure placed in the water tank and equipped with small holes. It has the ability to filter out smaller particles of dirt. In known systems, ultrafilters are generally cylindrical in structure, and they remove 20% of the water and contaminants. In its management, it is used to separate the circulation chambers from the dirt collection chambers around the crankcase. It is positioned in this way. This structure filters out dirt during washing and allows it to pass into the circulation chamber. By preventing this, it contributes to the removal of pollution. Publication US2015000714 describes a sump 25 that includes a water reservoir for collecting washing water. This describes a dishwasher with a sump system that includes a protective casing. Sump It has an opening in its housing that allows the washing tub and the water tank to pass through each other. a fine filter located at the top, a cylindrical coarse filter above this opening, and water a microfilter designed in a flat shape to trap impurities in its chamber It is located. The microfilter collects dirt along with a portion of the side and bottom surfaces of the crankcase. 30 It describes his room. A BRIEF DESCRIPTION OF THE INVENTION The aim of the invention is to collect smaller pollutants more efficiently by placing them in the ultrafilter at 35°C. a pre-filter that allows water to be sent and ensures water efficiency in the dishwasher It provides the element. 2 To achieve the aforementioned purposes, the invention consists of a flat metal plate and an opening in the center of the plate. containing a central opening of at least 100 mm in diameter, adjusted to allow the passage of dirty dishwashing liquid. This relates to a pre-filter element for the dishwasher sump assembly. Pre-filtering. In this component, the flat metal plate thickness was selected in the range of 0.30 - 0.40 mm, with a surface thickness of 0.30 5 A porous section containing multiple holes with diameters ranging from mm to 0.60 mm. It contains and the porous section surrounds at least partially a central opening. It was adjusted. In the tests performed, surprisingly, the pores of the flat metal plate being of the selected diameters, the ultrafilter located in the central opening it surrounds is smaller This has made it possible to send particulate pollutants. In this way, the described preliminary 10 Dishwashers that use a cleaning element offer both water and energy efficiency. It has been enhanced. Preferably, the pre-filter element is made of a single piece of metal plate. As described The pre-filter element helps save water and energy in dishwashers by removing particles. It is designed to increase filtration efficiency and meet high hygiene standards. Ideally, the porous section is arranged to completely surround the central opening. In this way, the dirty dishwashing liquid should be able to pass easily to the lower section during radial movement. while allowing small particles to pass through the ultrafilter and increasing particle efficiency. It provides opportunities. Ideally, one that provides a watertight gap between the central opening and the porous section. A support perimeter without holes is included. The support perimeter holds the dirty dishes that have passed through the pre-filtration. Its non-porous structure allows the liquid to be accelerated as it approaches the central opening. In this way, a continuous flow of dirty dishwashing liquid towards the central opening is supported, and Filtration efficiency is increasing. Additionally, the metal plate has structurally weakened pores. The structural element of the central opening, which is distanced from the section, is a thin, flat, and thin metal plate. It allows for opening by cutting without compromising its integrity. Preferably, a system of adjacent and spaced plates is provided in the porous part of a flat metal plate. The distance between the first hole and the second hole from their central axes must be at least 0.5 mm. 30 It has been adjusted. Ideally, the center-axis distance should be between 0.5 and 1.5 mm, and preferably between 0.8 mm and 1.2 mm. It is adjusted within the range. A sump with a pre-filtering element that has the selected ranges. A dishwasher with a sump system saves 20% more energy than one without a sump system. It has been found that this results in both water efficiency and more successful cleaning. 3 Ideally, the cross-section of the holes in the porous section is set to be round or polygonal in shape. Dimensions during the forming of selected cross-sectional geometries on thin and flat metal sheets. where precision can be ensured and no deformation occurs in the holes drilled in the sheet metal. The reason for this has been determined. Probably, there are different geometric shapes within the porous part. It is possible to use pores of various shapes and diameters. For example, 5 arranged from the outer periphery inwards. The diameters of the holes can gradually decrease. Or, holes can be hexagonal or circular. They can be used together. Preferably, the empty space between the pores of the porous section equals the total porous section. The ratio to the area is adjusted to be between 10% and 20%, specifically between 18% and 20%. 10 The selected range facilitates the flow of dirty dishwater compared to other values, and It has been found to minimize the risk of blockage. Ideally, the flat metal plate is made of stainless steel. Stainless steel has pores. 15 that maintains dimensional stability during part formation and allows for precise hole machining It has been determined. Ideally, the pores of the porous portion are arranged in a matrix structure. The matrix structure can be flat or In its cross-matrix structure, it significantly reduces water clogging rates in the porous portion. It has been observed. 20 Ideally, a plate on the outer periphery that at least partially surrounds the porous portion. A frame is provided. The frame can be flat or stepped. In either case, the frame... It helps to evenly distribute the flow of dirty dishwashing liquid from the outer periphery to the inside, and the filter It has been determined that it increases its efficiency. When it is in stages, a frame pool structure 25 by creating and increasing the height of the dirty dishwater within the porous section It improves filtration efficiency. A preferred configuration of the invention to achieve the aforementioned purpose is the one mentioned above. a pre-filter element and a hole with a diameter of 0.20-0.35 mm that fits into its central opening 30 It is a dishwasher filter assembly containing an ultrafilter with gaps. Dishwasher The filter assembly largely prevents the ultrafilter from clogging and ensures proper cleaning of the dishwasher where it is used. It increases energy efficiency in the machine. A preferred application of the invention to achieve the aforementioned purpose is described above in section 35. The mentioned pre-filter element is related to a production method. The method involves a thickness of 0.30 - 0.40 mm. Supply of flat and thin metal sheets within this range, a metal sheet cleaning device. cleaning by means of applying a light-sensitive paint or dry film to an application surface of the metal sheet. 4 The application and coating involves UV light generated by a UV light source penetrating the porous part. by passing it through a mask in the form of a film and exposing it onto a painted or film-applied surface. Curing the negative of the porous portion pattern on the coating, exposed to curing etching the surface of the metal sheet by cleaning the remaining masked parts. Obtaining the parts, 5 of which are abraded by applying an abrasive agent. by exposing it to corrosion, a porous section is obtained and the remaining coating The cleaning process includes the steps for these parts. Thanks to the mentioned method, 0.30 - A metal sheet as thin as 0.40 mm can be processed to a thickness of 0.30 mm - 0.60 mm without compromising structural integrity. It is possible to create a porous section containing multiple holes with diameters within a certain range. is. 10 BRIEF DESCRIPTION OF THE FIGURES Figure 1 shows a representative assembly of the filtering element that is the subject of the invention. This is a schematic cross-sectional representation of the dishwasher washing drum sump assembly. 15 Figure 2 shows a top view of a representative configuration of the filter element that is the subject of the invention. Figure 3 shows a representative structure of the filter element, the subject of the invention, through chemical etching. This is a schematic representation of the production steps. 20 DETAILED DESCRIPTION OF THE INVENTION In this detailed description, the subject matter of the invention may be developed without any restrictions and The explanation is given with references to examples only to better illustrate the subject. 25 In Figure 1, the dishwasher washing drum has a flat base plate (a) that is removable. A crankcase assembly (10) is shown schematically from the side. Crankcase assembly (10) a reservoir in the form of a container with a water inlet (12) and water outlet (16) opening (14) and this a pre-filter element 30 which fits into the open mouth (18) adjusted to allow passage of dirty dish liquid (30) and central flow path (20). Central flow path (20) is made of plastic injection. It is a manufactured hollow cylindrical structure and is adjusted in the middle of the pre-filter element (30). by being drawn from the upper wide stepped part which has grooves (24) on the central opening (36) It is fitted in a removable manner. The central flow path (20) is narrow lower retaining extension (22). It extends at a distance from the base of the reservoir (14) and is surrounded by ultrafilters (26) 35 It has liquid outlets where it is located. The pre-filter element (30) closes the mouth (18) of the crankcase assembly (10). It partially covers the central flow path (20) by encircling it. In this way, the particle when the dirty dishwashing liquid containing contaminants in the form of a slurry reaches the bottom of the washing tank (a) The water accumulates at the bottom (a) and is filtered and transferred to the crankcase assembly (10) to be transferred to the circulation system. It reaches. Here, from the base plate (a), the front plate is adjacent to it and placed in the same plane. It is delivered to the filter element (30). The pre-filter element (30) is a monolithic flat piece. It is in the form of a metal plate (32) and is 0.30 mm thick. There is a 5 on the metal plate (32). A porous section (34) is formed. The water filtered from here goes directly to the reservoir (14) In an alternative application, the water is passed through the retaining extension (22) to reach the ultra It is also possible to deliver it to the filter (26). Figure 2 shows a representative application of the pre-filter element (30) from above. Pre-filter 10 element (30) is in the form of a rectangle with rounded edges. A frame (38) The relief forms the outer periphery of the plate (32) and the base plate outwards. It forms a flange in line with (a). On the inside of the frame (38) near the long edge. and a central opening (36) is cut in the middle, aligned with the center. The central opening (36) is circular. It is in the form and has a diameter of 50 mm. From the central opening (36) radially inward concentric and 15 A planar support periphery (37) is provided. The support periphery (37) is connected to the central hole (36). The porous part (34) is a flat, non-perforated section of the plate (32) between the frame (37) by making numerous identical holes cross between the outer part of the support periphery (37) A porous part (34) was obtained. Here, as seen in the enlarged illustration, a first hole (341) and the adjacent and distant second hole (342) are of equal diameter and are uniformly 20 one after the other. The holes are arranged in a similar, crisscross and sequential manner. Each hole has a diameter of 0.6 mm (d). The distance between the centers of the first hole (341) and the second hole (342) is 1.20 (L). The area of ​​the porous part (34) without holes is adjusted to mm. Thus, the area of ​​the porous part (34) without holes is equal to the area of ​​the holes. The empty space ratio is 18.3%. This ratio indicates that the dirty dishwater passes through the pre-filter. It was determined that the element (30) could flow without causing a blockage. Pre-filter 25 The dirty dish liquid passing through the element (30) is discharged into the central opening (36) with a reduced contamination load. It is progressing. Here, it is taken to the ultrafilter (26) via the central flow path (20). Figure 3 schematically shows the production method of the pre-filter element (30). The production stages, in terms of main headings, are film-graphic work, metal sizing, plate surface 30 Preparation, masking, painting, coating - exposure, plate area cleaning, chemical etching. and consists of paint removal steps. Pre-filter drawn during the Graphic and Film Preparation process. The porous part of the element (34) pattern graph will be suitable for chemical etching processes. It is designed in such a way that the film work is positioned so that the front and back sides completely overlap. It is prepared by placing it. The output from the film printing machine will be used as a mask (5) 35 Depending on the product to be applied, a stainless steel sheet (1) is prepared in the warehouse. In the representative structure, flat stainless steel metal sheet (1) is cut from a roll to 0.30- 6 It is prepared with a thickness of 0.40 mm. Oil on the surface of the sized metal sheet (1) coming from the warehouse, Chemical cleaning, rinsing and (2) chemical cleaning in a cleaning device to remove dirt and dust. It is passed through drying. The cleaned metal sheet (1) is painted with photosensitive paint on both sides. It is coated with dryfilm application (4). For this process, a coating device (3) Hot rollers are used. Metal sheets (1) are passed through the rollers or screen printing 5 a plate coated with paint or dry film, onto which the film will be exposed by applying paint using this method It is prepared. The metal plate (1) is fed into the oven for drying after coating. Next in the stage, dry film or painted (4) metal plates (1) consisting of film on which graphic work has been done They are exposed under a UV light beam provided by a UV light source (6) with a mask (5). The hole patterns on (5) are processed onto the metal plate (1) by this process. This process is done simultaneously with 10 It is applied to both the front and back sides of the metal plate (1). By exposure process The pattern on the mask (5) is applied to the transparent areas with UV light effect in paint or The dry film (4) ensured the curing of the corresponding areas. The black area in the mask (5) Since the areas did not receive UV light (4), the paints could not harden. These unhardened areas are dry. The film / paint plate (4) is cleaned at this stage with the help of alkaline chemicals and etching 15 The abrasive parts (7) formed by the patterns to be made appear here. Chemical These metal plates (1) that are subjected to corrosion are acidic from both the front and back surfaces. exposed to a chemical-containing abrasive agent (8) and temperature, the metal plate (1) is exposed to the outside The exposed and unprotected abrasive parts (7) are subjected to acid corrosion. The porous part (34) consists of holes with a diameter between 0.30 mm and 0.60 mm. 20 After chemical etching, the desired patterns are obtained and applied to the plate. Caustic or alkaline solution is applied to the dry film / paint on the inactive surface of the metal plate. It is softened with the help of a chemical and cleaned with pressure rinses, then dried in an oven. After this stage, the pre-filtration element is obtained, so the plate with the perforated part (34) (32) If necessary, it is sent to the forming process, to the coloring process. Here, for example, a 25 With the molding process, both the central opening (36) is cut precisely and the outer The frame (38) is formed in the periphery. REFERENCE NUMBERS 1 Metal sheet 20 Central flow path 2 Cleaning devices 22 Holding extensions 3 Coating assemblies 24 Grooves 4 Coatings 26 Ultra Filters Mask 26-Level Extension 7 6 UV light sources, 30 pre-filter elements 7 Erosion section 32 Plate 8 Abrasive agent 34 Porous part (mesh) Crankcase assembly 341 First hole 12 Input 342 Second hole 14 chambers, 36 central openings. 16 Output 37 Support Periphery 18 Mouths 38 Frames a Base plate L Hole spacing Hole diameter

Claims

8 REQUESTS 1- A flat metal plate (32) and a dirty dish liquid passage opened in the center of the plate (32). dishwasher with a central opening (36) of at least 100 mm diameter which is properly adjusted The pre-filter element (30) for the crankcase assembly (10) is a flat metal plate (32) 5 The thickness was chosen to be between 0.30 - 0.40 mm, and the surface is between 0.30 mm - 0.60 mm. It contains a porous section (34) with multiple holes having diameters in the range and a central opening (36) of the porous section (34) is at least partially yellowed It is characterized by being adjusted. 2- A pre-filtering element (30) that conforms to Claim 1 and whose feature is the porous section (34) It is characterized by its central opening (36) being adjusted to completely wrap around it. 3- A pre-filtering element (30) that is suitable for any of the previous requirements and has the following characteristic: a 15 that provides a waterproof distance between the central opening (36) and the porous section (34) It contains a support periphery without holes (37). 4- A pre-filtering element (30) that is suitable for any of the previous requirements and has the following characteristic: provided adjacent and spaced in the porous part of the flat metal plate (32) (34) The distance between a first hole (341) and a second hole (342) from their central axes is 20 (L) must be adjusted to at least 0.5 mm. 5- A pre-filtering element (30) that conforms to claim 4 and whose characteristic is the distance between the center axis (L) The adjustment should be between 0.5 and 1.5 mm, and preferably between 0.8 mm and 1.2 mm. 6- A pre-filtering element (30) conforming to requirements 4-5, whose feature is the porous part (34) with the cross-section of the holes (341, 342) being round or polygonal in form It is characterized by... 7- A pre-filtering element (30) that is suitable for any of the previous requirements and has the property of 30 The total porous section is the empty space between the pores of the porous section (34). (34) The ratio of the area is adjusted between 10% and 20%, especially between 18% and 20%. It is the fact that. 8- A pre-filtering element (30) that is suitable for any of the previous requirements and has the property of 35 It is characterized by the flat metal plate (32) being made of stainless steel. 9 9- A pre-filtering element (30) that is suitable for any of the previous requirements and has the following characteristic: The porous part (34) is characterized by the arrangement of the holes (341, 342) in the matrix structure. is being done. 10- A pre-filtering element (30) that is suitable for any of the previous requirements and has the property of 5 the outer periphery of the plate (32) at least partially surrounds the porous part (34). is that it includes a framework (38). 11- A pre-filtering element (30) and its central one that is suitable for any of the previous requirements. an ultrafilter (26) with hole gaps of 0.20-0.35 mm diameter placed in the opening (36) 10 A dishwasher filter assembly containing a filter. 12- A pre-filtering element (30) production method in accordance with claim 1-11, 0.30 - 0.40 mm Supply of flat and thin metal sheets (1) in the thickness range, cleaning of metal sheets (1) Cleaning by means of the device (2), a coating on an application surface of the metal sheet (1) 15 plastering with light-sensitive paint or dry film by means of a device (3) and a UV light (4) UV light generated by source (6) through a mask (5) in the porous part (34) pattern By passing it through and exposing it onto a plate coated with paint or dry film (4), porous Curing of the negative of part (34) pattern on plate (4), subjected to curing Cleaning of the remaining masked parts on the coating surface of the metal sheet (1) 20 Obtaining the abrasive parts (7), abrasion by applying an abrasive agent (8) by exposing parts (7) to corrosion, obtaining the porous part (34) and The process includes cleaning the remaining parts of the coating (4).

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