Wall element for an outer wall of a dishwasher's wash chamber, dishwasher, method for manufacturing a wall element for an outer wall of a dishwasher's wash chamber and method for manufacturing a dishwasher

Abstract

Wall element (130) for an outer wall (115) of a washing chamber (110) of a dishwasher (100), wherein the wall element (130) has a mounting surface (232) for mounting on the outer wall (115) of the washing chamber (110) and an inflow surface (234) facing away from the mounting surface (232) for flow by a cooling fluid flow (125), characterized in that a plurality of recessed sections (240) for influencing the cooling fluid flow (125) are formed on the inflow surface (234) of the wall element (130), wherein each recessed section (240) of the plurality of recessed sections (240) is formed in a spherical cap shape.

Description

[0001] The invention relates to a wall element for an outer wall of a dishwasher's wash chamber, a dishwasher, a method for manufacturing a wall element for an outer wall of a dishwasher's wash chamber and a method for manufacturing a dishwasher.

[0002] In dishwashers of a low price range or entry-level class, technologies such as automatic door opening, sorption drying or recirculating air condensation drying may be avoided for cost reasons, so that in particular only condensation of moisture on an inner wall of the wash chamber may be used.

[0003] DE 10 2007 008 950 A1 describes a dishwasher with a condensation drying device and a method for carrying out a drying program section in such a dishwasher.

[0004] DE 10 2004 044 176 A1 describes a wall element for an outer wall of a dishwasher's wash chamber, which is designed as a Peltier element, the heat-emitting side of which has a rib-shaped surface along which air from the wash chamber is guided.

[0005] The invention aims to provide an improved wall element for an outer wall of a dishwasher's wash chamber, an improved dishwasher, an improved method for manufacturing a wall element for an outer wall of a dishwasher's wash chamber, and an improved method for manufacturing a dishwasher.

[0006] According to the invention, this problem is solved by a wall element for an outer wall of a dishwasher's wash chamber, a dishwasher, a method for manufacturing a wall element for an outer wall of a dishwasher's wash chamber, and a method for manufacturing a dishwasher with the features of the main claims. Advantageous embodiments and further developments of the invention are described in the dependent claims.

[0007] The advantages achievable with the invention consist of improved heat dissipation for a dishwasher, resulting, depending on the process design, in improved drying and / or reduced energy consumption. In particular, the fan power can be maintained or reduced. Furthermore, manufacturing costs for the wall element can be minimized, since such a wall element is typically installed in a dishwasher anyway. The use of alternative insulation materials can also be avoided, thus preventing potential losses in cost and insulation. Additionally, further energy savings can be achieved through the improved drying process, for example, by keeping the temperature of the rinse cycle preceding the drying stage low.To improve steam condensation on the walls of the dishwashing chamber, for example, forced convection can be generated on an exterior wall of the chamber using an auxiliary fan to dissipate as much heat as possible. Heat present in the wall element, with which the dishwashing chamber walls are at least partially coated for sound insulation, can be dissipated more easily, efficiently, and quickly. This allows, for example, for the rapid and complete removal of heat from the wall element during a drying cycle. Consequently, the fan output can be maintained or reduced, minimizing costs and noise, while particularly improving heat transfer between the wall element and a cooling fluid. This also eliminates the need for cooling fins or similar components on the surface of the wall element requiring cooling.This allows for a reduction in costs and flow resistance, as well as improved manufacturability. The wall element enables a particularly advantageous modification of the turbulence structure near the surface of the wall element to be cooled, thus improving momentum exchange and / or heat exchange within the flow boundary layer of the cooling fluid. This is achieved by incorporating recesses, especially with a defined geometry, into the surface of the wall element to be cooled.

[0008] A wall element for the outer wall of a dishwasher's wash chamber is presented, wherein the wall element has a mounting surface for attachment to the outer wall of the wash chamber and an inflow surface facing away from the mounting surface for the flow of a cooling fluid, wherein a plurality of recessed sections for influencing the cooling fluid flow are formed on the inflow surface of the wall element. The inflow surface preferably extends substantially over the entire surface of the corresponding outer wall of the wash chamber.

[0009] The wall element can be shaped or designed as a mat or panel for noise reduction. The cooling fluid flow can be a liquid flow, but is preferably an air flow. The mounting surface can be a surface for attaching the wall element to an external surface of the outer wall of the washing chamber, located outside the washing chamber.

[0010] According to one embodiment, the recessed sections can be formed in at least a portion of the inflow surface, preferably in a substantial or nearly the entire portion of the inflow surface. The recessed sections can, for example, share at least one common, uniform geometric property. Such an embodiment offers the advantage of further improving heat transfer between the wall element and the cooling fluid flow.

[0011] Each recess section of the plurality of recess sections is shaped like a spherical cap. Each recess section can have a predefinable or predefined diameter and, additionally or alternatively, a predefinable or predefined radius of curvature. In particular, all recess sections can have the same diameter and, additionally or alternatively, the same radius of curvature within manufacturing tolerances. Such an embodiment offers the advantage that optimal geometric properties of the recess sections can be achieved for a specific application and flow characteristics in order to increase heat dissipation. Preferably, the diameter of the recess sections is 4 mm to 12 mm.

[0012] Preferably, the recessed sections have a depth, hereinafter also referred to as penetration depth t. Ddesignated, which corresponds to between 30% and 70% of the thickness of the wall element and / or which corresponds to between 10% and 40% of the diameter of the recess sections.

[0013] Furthermore, adjacent recess sections of the majority of recess sections can be formed at a predefinable or predefined distance from one another. In particular, all recess sections can be uniformly spaced from one another within manufacturing tolerances. Such an embodiment offers the advantage that optimal flow characteristics can be achieved in the cooling fluid to improve heat dissipation. According to one embodiment example, the distance between adjacent recess sections is smaller than their diameter. Preferably, it is between 1 and 10 mm, and particularly between 2 and 5 mm.

[0014] Furthermore, the majority of recessed sections can be formed in a predefinable or predefined arrangement pattern. Such an embodiment offers the advantage that the flow characteristics of the cooling fluid flow can be further improved, thus achieving enhanced heat transfer between the wall element and the cooling fluid.

[0015] In particular, the wall element can be made of a carbon-containing material. Specifically, the wall element can be made of bitumen. Alternatively, the wall element can be made of a plastic material or similar. Such an embodiment offers the advantage that the acoustic insulation function of the wall element can be achieved or improved.

[0016] A dishwasher is also presented which has a wash chamber that is at least partially bounded by an outer wall. The dishwasher has an embodiment of the aforementioned wall element, the mounting surface of which can be attached to, or is attached to, at least a portion of the outer surface of the outer wall of the wash chamber. A channel is formed between the inflow surface of the wall element and an outer housing wall of the dishwasher, through which a cooling fluid flows during the drying phase of a wash program. This cooling fluid can be generated, in particular, by a fan. The channel height, i.e., the distance between the inflow surface and the outer housing wall, and the flow velocity of the cooling fluid, in particular the cooling air flow, are selected such that the resulting Reynolds number is between 10,000 and 50,000.Typically, a value of 5 mm to 20 mm is chosen for the channel height. Preferably, the recessed sections in the upstream surface have a depth or penetration depth t. D on, which corresponds to between 5% and 20% of the channel height of the wall element.

[0017] In conjunction with the dishwasher, an embodiment of the aforementioned wall element can be advantageously used to enable and improve condensation of moisture in the wash chamber. In particular, such a wall element can also be used to create a noise barrier between the wash chamber and its surroundings. Optionally, the dishwasher can also have more than one such wall element.

[0018] Furthermore, a method for manufacturing a wall element for an outer wall of a dishwasher's wash chamber is presented, wherein the wall element has an attachment surface for mounting on the outer wall of the wash chamber and an inflow surface facing away from the attachment surface for flow by a cooling fluid stream, wherein the method includes a step of forming a plurality of recessed sections to influence the cooling fluid stream at the inflow surface of the wall element.

[0019] By carrying out the manufacturing process, an embodiment of the aforementioned wall element can be advantageously provided.

[0020] According to one embodiment, the majority of recessed sections can be formed by means of a roller, in particular a calender roller, during the forming step. Such an embodiment offers the advantage that the recessed sections can be produced quickly, cost-effectively, and easily. Furthermore, the forming of the recessed sections can be combined with a rolling step that is already planned.

[0021] Furthermore, a method for manufacturing a dishwasher is presented, wherein the method comprises a step of providing an outer wall of a washing chamber which is at least partially bounded by the outer wall, and a wall element according to an embodiment of the aforementioned wall element, and a step of attaching the wall element with its attachment surface to at least a partial section of an outer surface of the outer wall of the washing chamber.

[0022] By carrying out the manufacturing process, an embodiment of the aforementioned dishwasher can be advantageously provided. The manufacturing process can be advantageously carried out in conjunction with an embodiment of the aforementioned manufacturing process. The manufacturing process can also be advantageously carried out in conjunction with an embodiment of the aforementioned wall element.

[0023] An embodiment of the invention is shown purely schematically in the drawings and is described in more detail below. It shows Fig. 1 a schematic sectional view of a dishwasher according to an embodiment of the present invention; Fig. 2 a schematic sectional view of a partial section of a wall element according to an embodiment of the present invention; Fig. 3 a schematic top view of a partial section of a wall element according to an embodiment of the present invention; Fig. 4 a schematic top view of a wall element according to an embodiment of the present invention; Fig. 5 a flowchart of a manufacturing process according to an embodiment of the present invention; and Fig. 6 a flowchart of a method for manufacturing according to an embodiment of the present invention.

[0024] Fig. Figure 1 shows a schematic sectional view of a dishwasher 100 according to an embodiment of the present invention. The dishwasher 100 can also be referred to as a dishwasher 100. The schematic representation shows the dishwasher 100 in Fig. Figure 1 shows a housing 105, a wash chamber 110 with an outer wall 115, a fan 120 for generating a cooling fluid flow 125, and a wall element 130. The wash chamber 110, the outer wall 115, the fan 120, the cooling fluid flow 125, and the wall element 130 are arranged within the housing 105 of the dishwasher 110.

[0025] The wash chamber 110 is at least partially bounded by the outer wall 115. The outer wall 115 is made, for example, of a metal, in particular stainless steel or the like. The fan 120 is arranged outside of and adjacent to the wash chamber 110. The fan 120 is designed to generate the cooling fluid flow 125. The cooling fluid flow 125 is, in this case, according to the Fig. In the embodiment of the present invention shown in 1, an airflow is used.

[0026] The wall element 130 according to the in Fig. In the embodiment of the present invention shown in Figure 1, the wall element 130 is attached to a section of an outer surface of the outer wall 115 of the washing chamber 110. More precisely, the wall element 130 is attached to the outer surface of the outer wall 115 in a side wall section of the outer wall 115. In other words, the wall element 130 is attached to a surface of the outer wall 115 facing away from the washing chamber 110 and located outside the washing chamber 110, in a section of the outer wall 115. The wall element 130 is, according to the illustration in Figure 1, Fig. In the embodiment of the present invention shown in Figure 1, the wall element 130 is formed from a carbon-containing material, in particular bitumen. The wall element 130 is formed as a mat or plate. The cooling fluid flow 125 runs along the wall element 130 between the housing 105 and the wall element 130. The wall element 130 is described in more detail below.

[0027] Fig. Figure 2 shows a schematic sectional view of a partial section of a wall element 130 according to an embodiment of the present invention. The wall element 130 is intended for an outer wall of a dishwasher's wash chamber. The wall element 130 is the wall element made of Fig. 1 or a similar wall element. Furthermore, in Fig. 2 a cooling fluid flow 125 is shown, which is the cooling fluid flow from Fig. 1 or a similar cooling fluid flow.

[0028] The wall element 130 has a mounting surface 232 for attachment to the outer wall of the wash chamber and a flow surface 234 facing away from the mounting surface 232 for the flow of the cooling fluid 125. The mounting surface 232 is designed according to the Fig. In the embodiment of the present invention shown in Figure 2, the wall element 130 is planar or planar within manufacturing tolerances. A plurality of recessed sections 240 are formed in or on the inflow surface 234 of the wall element 130. The recessed sections 240, of which [number] are shown in the illustration, are Fig. The three elements shown as examples are designed to influence the cooling fluid flow 125. The cooling fluid flow 125 runs along the inflow surface 234 of the wall element 130.

[0029] According to the in Fig. In the embodiment 2 shown in the present invention, each recessed section 240 of the plurality of recessed sections 240 is shaped like a spherical cap. Each recessed section 240 has a diameter D p and a radius of curvature R. In particular, each recessed section 240 has the same diameter D within manufacturing tolerances. pand have the same radius of curvature R. The diameter D p and the radius of curvature R are predefinable or predefined. Furthermore, each depression section 240 has a depth t. D or penetration depth t D on.

[0030] Fig. Figure 3 shows a schematic top view of a partial section of a wall element according to an embodiment of the present invention. The wall element is the wall element made of Fig. 1 or Fig. 2 or a similar wall element. In the top view of Fig. Figure 3 shows the inflow surface of the wall element with the recessed sections 240. In the view of Fig. Only seven in-depth sections are shown as examples (240). Furthermore, in Fig. 3 a cooling fluid flow 125 is shown, which is the cooling fluid flow from Fig. 1 Fig. 2 or a similar cooling fluid flow.

[0031] In Fig. Figure 3 shows an arrangement of the recessed sections 240 relative to each other according to the embodiment of the present invention shown here. The diameter D is p The recessed sections 240 are illustrated again by way of example using one of the recessed sections 240. Furthermore, a distance b is shown in which adjacent recessed sections 240 of the majority of recessed sections 240 are formed or arranged relative to each other. The recessed sections 240 are formed here in a predefinable or predefined arrangement pattern. The arrangement pattern is defined by the distance b as well as a distance b, also shown in the figure. Fig. The arrangement angle γ and offset angle γ are shown in Figure 3.

[0032] In particular with reference to Fig. 2 and Fig. Figure 3 shows an exemplary arrangement and geometry of the depression sections 240. The depression sections 240 can also be referred to as dimples or pits. In particular, the depression sections 240 can be evenly distributed over the entire inflow surface 234 of the wall element 130. The geometry, exemplified here by the diameter D p , the radius of curvature R, the penetration depth t DThe distance b and the arrangement angle γ or offset angle γ are characterized and can be determined experimentally depending on the Reynolds number Re. Here, Re = uh / v; where Re represents the Reynolds number, h represents a channel height or distance between the inflow surface 234 and the dishwasher housing, v represents the kinematic viscosity of the coolant flow 125, and u represents an average velocity or flow rate of the coolant flow 125.

[0033] For example, the following exemplary size ratios or geometric properties of the recess sections 240 can be determined, with which the best results are achieved. For example, for a Reynolds number Re between 10,000 and 50,000, a thickness d of the wall element 130 of 2 to 4 millimeters, and a channel height h or the distance between the inflow surface 234 and the dishwasher housing of 5 to 20 millimeters, the following optimal size ratios for the recess sections 240 or dimples 240 can be determined: a dimple diameter D p from D p = (0.2 ... 1.2) * h, the dimple radius of curvature as a function of the dimple diameter D p as well as the penetration depth t D , i.e., R = f (D p , t D ), a penetration depth t D from t D = (0.1 ... 0.4) * D p , a dimple distance b of b = (0.2 ... 0.8) * D pand an angle-offset arrangement, for example hexagonal with an arrangement angle γ or offset angle γ of 60 degrees or alternatively a perpendicular arrangement or a 90-degree grid with an arrangement angle γ or offset angle of 90 degrees.

[0034] An example set of specifically determined values ​​for the geometric properties of the in-depth sections 240 includes, for example, a thickness d of the wall element 130 of 3 millimeters, a diameter D p of 8 millimeters, a penetration depth t D of 1.5 millimeters, a radius of curvature R of 6.1 millimeters, a channel height h of 15 millimeters, a distance b of 3 millimeters and an arrangement angle γ or offset angle γ of 60 degrees.

[0035] Fig. Figure 4 shows a schematic top view of a wall element 130 according to an embodiment of the present invention. The wall element 130 is the wall element made from one of the Fig. 1 to 3 or a similar wall element. In the top view of Fig. Figure 4 shows the inflow surface of the wall element 130 with the recessed sections 240. In the illustration of Fig. Figure 4 shows that the recessed sections 240 are arranged or formed in at least one subsection of the upstream surface. According to the Fig. In the embodiment of the present invention shown in Figure 4, the recessed sections 240 are arranged or formed in a partial section of the upstream surface, wherein a circumferential edge section of the upstream surface is free of recessed sections 240.

[0036] Fig. Figure 5 shows a flowchart of a method 500 for manufacturing according to an embodiment of the present invention. The method 500 can be carried out to manufacture a wall element for an outer wall of a dishwasher's wash chamber. The wall element has a mounting surface for attachment to the outer wall of the wash chamber and an inflow surface facing away from the mounting surface for the flow of a cooling fluid.

[0037] The manufacturing process 500 includes a step 510 of forming a plurality of recessed sections to influence the cooling fluid flow at the upstream surface of the wall element. Thus, by carrying out process 500, a wall element such as the wall element made from one of the Fig. 1 to 4 can be completed.

[0038] According to one embodiment, in step 510 of the forming process, the majority of recessed sections are formed by means of a roller, in particular a calender roller.

[0039] Fig. Figure 6 shows a flowchart of a method 600 for manufacturing according to an embodiment of the present invention. The method 600 can be carried out to manufacture a dishwasher. The method 600 is used in conjunction with the method 500. Fig. 5 executable. By carrying out procedure 600, a dishwasher like the dishwasher from Fig. 1 can be manufactured.

[0040] The manufacturing process 600 comprises a step 610 of providing a washroom, which is at least partially bounded by an outer wall, and a wall element manufactured according to the manufacturing process. In a subsequent step 620 of attaching the wall element, the mounting surface of the manufacturing process 600 is attached to at least a section of an outer surface of the outer wall of the washroom.

[0041] With reference to the Fig. In sections 1 to 6, an embodiment of the present invention is summarized and explained again in other words with regard to the wall element 130 and the recessed sections 240.

[0042] In a bitumen manufacturing process or thereafter, in step 510 of the demolding process, the inflow surface 234 is embossed with indentation sections 240 or with a dimple structure, for example, by means of a calender roller or the like. These indentation sections 240 are, for example, spherical pits or dimples, which are embossed into the inflow surface 234, particularly in a uniformly offset manner, during step 510 of the demolding process. According to exemplary embodiments of the present invention, turbulence of the cooling fluid flow 125 in the indentation sections 240 can be used to improve heat transfer from the wall element 130 to the cooling fluid flow 125. A recirculation zone is created inside at least a plurality of indentation sections 240, from which cooling fluid rises, forming a downstream longitudinal vortex pair or twin vortex.The resulting vortices transport cooling fluid from the gap between the flushing chamber 110 and the housing 105 towards the wall element 130, which increases both the temperature difference at the inflow surface 234 and the turbulence level of the cooling fluid flow 125. Both effects have a positive impact on increasing heat transfer.

Claims

[1] Wall element (130) for an outer wall (115) of a washing chamber (110) of a dishwasher (100), wherein the wall element (130) has a mounting surface (232) for mounting on the outer wall (115) of the washing chamber (110) and a flow surface (234) facing away from the mounting surface (232) for flowing by a cooling fluid flow (125), characterized by , that a plurality of recessed sections (240) are formed on the upstream surface (234) of the wall element (130) to influence the cooling fluid flow (125), wherein each recessed section (240) of the plurality of recessed sections (240) is shaped in a spherical cap shape. [2] Wall element (130) according to claim 1, characterized by , that the depression sections (240) are formed in at least one subsection of the upstream surface (234). [3] Wall element (130) according to one of the preceding claims, characterized by, that each depression section (240) has a predefinable or predefined diameter (D p ) and / or has a predefinable or predefined radius of curvature (R). [4] Wall element (130) according to one of the preceding claims, characterized by , that adjacent depression sections (240) of the majority of depression sections (240) are formed at a predefinable or predefined distance (b) from each other. [5] Wall element (130) according to one of the preceding claims, characterized by , that the majority of the depression sections (240) are formed in a predefinable or predefined arrangement pattern (b, γ). [6] Wall element (130) according to one of the preceding claims, characterized by , that the wall element (130) is formed from a carbon-containing material, wherein the wall element is formed in particular from bitumen. [7] Dishwasher (100) which has a washing chamber (110) which is at least partially bounded by an outer wall (115), characterized by that the dishwasher (100) has a wall element (130) according to one of the preceding claims, which can be attached or is attached with its mounting surface (232) to at least a partial section of an outer surface of the outer wall (115) of the washing chamber (100). [8] Method (500) for manufacturing a wall element (130) for an outer wall (115) of a washing chamber (110) of a dishwasher (100), wherein the wall element (130) has an attachment surface (232) for attachment to the outer wall (115) of the washing chamber (110) and a flow surface (234) facing away from the attachment surface (232) for flow by a cooling fluid flow (125), characterized bya step (510) of forming a plurality of spherical cap-shaped depression sections (240) to influence the cooling fluid flow (125) at the upstream surface (234) of the wall element (130). [9] Method (500) according to claim 8, characterized by , that in step (510) of the forming process the majority of depression sections (240) are formed by means of a roller, in particular a calender roller. [10] Method (600) for manufacturing a dishwasher (100), characterized by a step (610) of providing an outer wall (115) of a washing chamber (110) which is at least partially bounded by the outer wall (115) and a wall element (130) according to an embodiment of the aforementioned wall element and a step (620) of attaching the wall element (130) with its attachment surface (232) to at least a partial section of an outer surface of the outer wall (115) of the washing chamber (110).

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