EP3127397A1 - Heating device, domestic appliance, and method - Google Patents
Heating device, domestic appliance, and methodInfo
- Publication number
- EP3127397A1 EP3127397A1 EP15715993.0A EP15715993A EP3127397A1 EP 3127397 A1 EP3127397 A1 EP 3127397A1 EP 15715993 A EP15715993 A EP 15715993A EP 3127397 A1 EP3127397 A1 EP 3127397A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- insulating layer
- substrate
- heating device
- pores
- moisture
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims description 17
- 239000000758 substrate Substances 0.000 claims abstract description 42
- 239000004020 conductor Substances 0.000 claims abstract description 37
- 239000011248 coating agent Substances 0.000 claims abstract description 31
- 238000000576 coating method Methods 0.000 claims abstract description 31
- 239000011148 porous material Substances 0.000 claims abstract description 28
- 239000012530 fluid Substances 0.000 claims abstract description 21
- 238000007751 thermal spraying Methods 0.000 claims description 9
- 238000009413 insulation Methods 0.000 claims description 7
- 238000003980 solgel method Methods 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 235000019353 potassium silicate Nutrition 0.000 claims description 6
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 description 5
- 238000005507 spraying Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000010411 cooking Methods 0.000 description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 238000001246 colloidal dispersion Methods 0.000 description 2
- 238000010285 flame spraying Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010283 detonation spraying Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/78—Heating arrangements specially adapted for immersion heating
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/013—Heaters using resistive films or coatings
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/017—Manufacturing methods or apparatus for heaters
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/021—Heaters specially adapted for heating liquids
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/022—Heaters specially adapted for heating gaseous material
Definitions
- Heating device household appliance and process
- the present invention relates to a heating device, a household appliance and a method.
- Household appliances may have a heating device for heating a fluid such as air, steam, rinsing liquor or water.
- a heating device for heating a fluid such as air, steam, rinsing liquor or water.
- EP 1 672 958 A2 describes such a heating device in the form of a pipe heater.
- the tube heater comprises a metallic substrate, a heating conductor and an electrically insulating insulating layer arranged between the heating conductor and the substrate. In order to prevent direct contact of the fluid to be heated with the heating conductor, this is encapsulated together with the insulating layer.
- an object of the present invention is to provide an improved heater.
- a heating device for a domestic appliance having a substrate which has a first side facing a fluid to be heated and a second side facing away from the fluid to be heated, a planar heating conductor and an insulating layer arranged between the second side of the substrate and the planar heating conductor having pores proposed.
- the pores are sealed with a moisture-impermeable coating.
- the heating conductor is therefore preferably non-encapsulated or uncoated.
- the first side of the substrate may also be referred to as the usage page.
- the second side of the substrate may also be referred to as the heating side.
- the substrate may be a wall of a receiving area of the household appliance.
- the fluid to be heated may be air, vapor, water or rinse liquor.
- the substrate is preferably metallic.
- the substrate may be made of a steel sheet.
- the pores have a respective wall bounding them, wherein the moisture-impermeable coating is applied to the respective wall.
- the insulating layer is particularly porous. That is, the insulation layer has a plurality of micropores. The pores may be closed or interconnected.
- the moisture-impermeable coating is applied to the respective wall of the cavities in a sol-gel process.
- sol-gel process is understood as meaning a process for preparing non-metallic inorganic or hybrid-polymeric materials from colloidal dispersions, the so-called sols.
- the insulating layer is a ceramic layer.
- the insulating layer may be an aluminum oxide layer.
- the insulating layer may be an aluminum oxide layer.
- aluminum oxide as a coating material is particularly cost-effective.
- the planar heating conductor and / or the insulating layer are sprayed onto the substrate in a thermal spraying process.
- thermal spraying processes molten bath spraying, arc spraying, flame spraying, high-speed flame spraying, detonation spraying, cold gas spraying and / or laser spraying.
- the insulating layer is an amorphous vitreous layer.
- the insulating layer is a water glass layer.
- such a water glass layer does not have conductivity-promoting glass components such as sodium, calcium or the like.
- the waterglass layer may be applied in a sol-gel process.
- the planar heating conductor is made of a CrNi and / or a FeCr steel. As a result, a high corrosion resistance of the planar heating element is achieved. The operational reliability of the heater is thereby improved.
- the household appliance may be a dishwasher, a washing machine, a tumble dryer, a cooking appliance such as an oven or steamer, a kettle, a boiler, a water heater or the like.
- the heater may be part of the household appliance.
- a method of manufacturing a heater for a household appliance comprising the steps of: providing a substrate having a first side and a second side; Applying a pore-containing insulating layer to the second side of the substrate; Applying a planar heat conductor to the insulating layer; Sealing the pores of the insulating layer with a moisture impermeable coating; and mounting the substrate together with the insulating layer and the heating conductor such that the first side of the substrate faces a fluid to be heated and the second side of the substrate is remote from the fluid to be heated.
- the moisture-impermeable coating is applied to walls of the pores of the insulating layer.
- the liquid-impermeable coating is applied in a sol-gel process.
- the insulating layer and / or the planar heating conductor are applied in a thermal spraying process.
- FIG. 1 shows a schematic perspective view of an embodiment of a household appliance
- FIG. 2 shows a schematic sectional view of a heating device of the household appliance according to FIG. 1;
- FIG. 3 shows a further schematic sectional view of the heating device according to FIG. 2;
- Fig. 4 shows schematically a method of manufacturing the heating device according to Fig. 2;
- FIG. 5 shows a further schematic sectional view of the heating device according to FIG. 2
- FIG. and FIG. 6 shows a further schematic sectional view of the heating device according to FIG. 2.
- the same or functionally identical elements have been given the same reference numerals, unless stated otherwise.
- the household appliance 1 shows a schematic perspective view of an embodiment of a household appliance 1.
- the household appliance 1 can be, for example, a dishwasher, a washing machine, a tumble dryer, a cooking appliance such as an oven or a steamer, a kettle or the like.
- the household appliance 1 has a receiving area 2 which can be closed by a door 3.
- the receiving area 2 and the door 3 may form a receiving chamber 4 of the household appliance 1.
- the receiving chamber 4 may be, for example, a rinsing chamber or a cooking chamber of the household appliance 1.
- the receiving area 2 can be arranged inside a housing of the household appliance 1.
- the door 3 is shown in Figure 1 in its open position. By pivoting about a provided at a lower end of the door 3 pivot axis 5, the door 3 can be closed or opened.
- the receiving area 2 has a bottom 6, a floor 7 opposite the ceiling 7, a door 3 arranged opposite the rear wall 8 and two oppositely disposed side walls 9, 10.
- the receiving area 2 is in particular cuboid.
- the receiving area 2 may be, for example, circular cylindrical.
- the receiving area 2 is preferably at least partially made of a metal material, in particular of a steel sheet.
- the household appliance 1 also has a, in particular flat, heating device 1 1.
- "flat” means that the heating device 11 is flat and / or plate-shaped
- the heating device 11 may have a thickness of a few fractions of a millimeter up to several millimeters
- the heating device 11 is preferably on the outside on the receiving region 2
- the heater 11 may cover the floor 6, the ceiling 7, the rear wall 8, and the side walls 9, 10.
- the heater may only support the floor 6, the ceiling 7, the rear wall 8, and the side walls 9, 10
- the heating device 1 1 can also be provided on the door 3.
- 2 shows a schematic sectional view of the ceiling 7 with the heating device 1 1.
- the ceiling 7 is referred to below as a substrate.
- the substrate may further comprise the bottom 6, the rear wall 8, the side walls 9, 10 and / or the door 3.
- the heating device 1 1 has the metallic substrate 7.
- the substrate 7 has a use side 12 and a heating side 13 arranged opposite the use side 12.
- the use side 12 faces a fluid 14 to be heated.
- the fluid may be air, vapor, water or rinse liquor.
- the use side 12 may also be referred to as the first side of the substrate 7.
- the heating side 13 faces away from the fluid 14 to be heated.
- the heating side 13 can also be referred to as the second side of the substrate 7.
- the heater 1 1 further has a flat heating element 15.
- the heating conductor 15 is provided on the second side 13 of the substrate 7.
- the heating conductor 15 preferably has a plurality of conductor tracks 16.
- the conductor tracks 16 are preferably connected to one another and run in a meandering manner on the metallic substrate 7
- Heating conductor 15 is made for example of a CrNi steel and / or a FeCr steel. Between the planar heating conductor 15 and the second side 13 of the substrate 7, a, in particular electrically insulating, insulating layer 17 is arranged.
- the insulation layer 17 is preferably a ceramic layer applied directly to the substrate 7 in a thermal spraying process.
- the insulating layer 17 is made of aluminum oxide.
- FIG. 3 shows an enlarged schematic sectional view of the heating device 11.
- the insulating layer 17 preferably has a plurality of pores 18, of which only one is provided with a reference numeral in FIG.
- each pore 18 has a respective pore 18 bounding wall 19.
- the pores 18 are sealed with a moisture impermeable, in particular water impermeable, coating 20.
- the moisture-impermeable coating 20 is preferably applied only to the walls 19 of the pores 18.
- the coating 20 is an amorphous vitreous layer.
- the coating 20 may be a waterglass layer.
- such a water glass layer does not have conductivity-promoting glass components such as sodium, calcium or the like.
- the coating is applied to the walls 19 in a sol-gel process.
- the heating conductor 15 preferably no coating is provided. That is, the heating conductor 15 is not encapsulated and uncoated.
- the heating conductor 15 may be applied to the insulating layer 17 in a thermal spraying process.
- the thermal spraying process By sealing the pores 18 of the insulating layer 17 with the moisture-impermeable coating 20, the absorption of moisture into the porous insulating layer 17 is prevented. This ensures that the insulating layer 17 permanently retains its electrically insulating property even at high humidity.
- a method for producing such a heating device 11 will be described with reference to FIGS. 3 to 6.
- the substrate 7 is provided with the first side 12 facing the fluid 14 to be heated and the second side 13 facing away from the fluid 14 to be heated.
- the insulating layer 17 having the pores 18 is applied to the second side 13 of the substrate 7.
- the insulation layer 17 is sprayed directly onto the substrate 7 in a thermal spraying process.
- the planar heating conductor 15 is applied to the insulating layer 17 in a thermal spraying process.
- the conductor tracks 16 of the heating conductor 15 can be formed when applied to the insulating layer 17 with the aid of a template.
- the printed conductors 16 can be formed after the planar application of the heating conductor 15 by means of an erosive method.
- FIG. 5 shows, in a schematic sectional view, the substrate 7 with the sprayed-on porous insulating layer 17 and the heating conductor 15.
- a step S4 the pores 18 of the insulation layer 17 are subsequently sealed with the moisture-impermeable coating 20.
- the sealing of the pores may alternatively be done prior to spraying of the heating element 15.
- the pores 18 are preferably completely filled with a coating liquid 21.
- the pores 18 are infiltrated with the coating liquid 21.
- the coating liquid 21 is a sol.
- a "sol" is understood as meaning a colloidal dispersion.
- the coating liquid 21 is absorbed by the insulating layer 17 with the aid of capillary forces.
- the heating device 1 1 is annealed. As shown in FIG.
- this forms the amorphous vitreous moisture-impermeable coating 20 on the walls 19 of the pores 18.
- the substrate 7 - 10 together with the insulating layer 17 and the heating conductor 15 is installed in such a way that the first side 12 of the substrate 7 - 10 facing the fluid to be heated 14 and the second side 13 of the substrate 7 - 10 facing away from the fluid to be heated 14.
Landscapes
- Resistance Heating (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014206592.5A DE102014206592A1 (en) | 2014-04-04 | 2014-04-04 | Heating device, household appliance and process |
PCT/EP2015/056405 WO2015150188A1 (en) | 2014-04-04 | 2015-03-25 | Heating device, domestic appliance, and method |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3127397A1 true EP3127397A1 (en) | 2017-02-08 |
EP3127397B1 EP3127397B1 (en) | 2020-08-19 |
Family
ID=52829066
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15715993.0A Active EP3127397B1 (en) | 2014-04-04 | 2015-03-25 | Heating device, domestic appliance, and method |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3127397B1 (en) |
DE (1) | DE102014206592A1 (en) |
WO (1) | WO2015150188A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9525082B2 (en) * | 2013-09-27 | 2016-12-20 | Sunpower Corporation | Solar cell contact structures formed from metal paste |
DE102022205495A1 (en) | 2022-05-31 | 2023-11-30 | E.G.O. Elektro-Gerätebau GmbH | Heating device and method for producing such a heating device |
DE102022209108A1 (en) | 2022-09-01 | 2024-03-07 | E.G.O. Elektro-Gerätebau GmbH | Heating device for heating liquid and method for operating a heating device |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1019721A (en) * | 1962-10-31 | 1966-02-09 | Frank Christen Walz | Improvements in electric heaters |
US3791863A (en) * | 1972-05-25 | 1974-02-12 | Stackpole Carbon Co | Method of making electrical resistance devices and articles made thereby |
JP2745438B2 (en) * | 1990-07-13 | 1998-04-28 | ć ŞĺĽŹäĽšç¤ľčŤŹĺŽźčŁ˝ä˝ść‰€ | Heat transfer material and heating element for heating and heating device using the same |
AU3845799A (en) * | 1999-05-18 | 2000-12-05 | Advanced Heating Technologies Ltd. | Electrical heating elements and method for producing same |
DE102004060382A1 (en) | 2004-12-15 | 2006-06-29 | Bleckmann Gmbh & Co. Kg | Thick-film heating pipe |
-
2014
- 2014-04-04 DE DE102014206592.5A patent/DE102014206592A1/en not_active Withdrawn
-
2015
- 2015-03-25 WO PCT/EP2015/056405 patent/WO2015150188A1/en active Application Filing
- 2015-03-25 EP EP15715993.0A patent/EP3127397B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
WO2015150188A1 (en) | 2015-10-08 |
DE102014206592A1 (en) | 2015-10-08 |
EP3127397B1 (en) | 2020-08-19 |
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