EP2123119A1 - Heating element - Google Patents
Heating elementInfo
- Publication number
- EP2123119A1 EP2123119A1 EP07857616A EP07857616A EP2123119A1 EP 2123119 A1 EP2123119 A1 EP 2123119A1 EP 07857616 A EP07857616 A EP 07857616A EP 07857616 A EP07857616 A EP 07857616A EP 2123119 A1 EP2123119 A1 EP 2123119A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heating element
- pin
- thermal fuse
- element according
- connector
- 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 40
- 239000004020 conductor Substances 0.000 claims description 4
- 241000826860 Trapezium Species 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 description 4
- 238000013021 overheating Methods 0.000 description 4
- 239000011888 foil Substances 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000012777 electrically insulating material Substances 0.000 description 1
- 239000008233 hard water Substances 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- H05B3/82—Fixedly-mounted immersion heaters
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L15/00—Washing or rinsing machines for crockery or tableware
- A47L15/42—Details
- A47L15/4285—Water-heater arrangements
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00
- D06F39/04—Heating arrangements
-
- 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
- H05B3/40—Heating elements having the shape of rods or tubes
- H05B3/42—Heating elements having the shape of rods or tubes non-flexible
- H05B3/48—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material
Definitions
- the present invention relates to an electrical heating element with fuse, specifically to a heating element used for heating water in household appliances.
- an electrical heating element with fuse specifically to a heating element used for heating water in household appliances.
- Heating elements or simply heaters, incorporating electrical resistors inserted within a casing, generally immersed, are used in household appliances, e.g. dishwashers or washing machines.
- One of the problems of heating elements of this kind is overheating.
- the overheating of the heating element occurs, for example, due to either excessive operating time of the element without water or operation with the surface of the casing coated with lime scale after a period in which the heater was operated in contact with particularly hard water, without contemplating the use of other devices. It is well known that the presence of lime scale on heating resistors causes an overheating of the element which could lead to the breakdown of the element.
- a solution to avoid this kind of problem is to provide for a thermal fuse which has the function of cutting off the electrical current in case of sudden overheating of the heating element.
- a heating element with cylindrical-shape immersed casing which contains the heating electrical resistor inside, is connected by means of a leg wire to a thermal fuse.
- the latter is connected in turn by means of a pin which has the function of connecting to the power supply system.
- a heating element of this type presents however some drawbacks such as an excessive resistance, due to the excessive total length of its components, which implies a slower heat transmission from the heating resistor to the thermal fuse and a lower operating sensitivity of the latter, due to the longer distance between fuse and heating resistor, with consequent larger dimensions and longer reaction times of the thermal fuse. Less reliability and a shorter working life thus derive. It is thus felt the need to make a heating element which allows to overcome the aforesaid drawbacks. Summary of the invention
- the present invention thus intends to reach such objects by making a heating element which, in accordance with claim 1 , comprises an immersed casing containing an electrical heating resistor therein, fixed to a first pin, a thermal fuse and a power supply system connecting element, wherein the electrical heating resistor and the thermal fuse are connected by electrical conductor means, characterised in that the electrical conductor means comprise a connector, having a first cylindrical end part electrically connected to the first pin, a second cylindrical end part electrically connected to the thermal fuse, the diameter of said second part being wider than that of the first part, and a third tapered fitting part between first and second part.
- the total length is shortened by approximately 20%.
- the heat is carried directly and more rapidly onto the fuse body through the specific connector.
- the intervention times of the thermal fuse are thus shorter and its distance from the source of heat is smaller.
- the heating element is mechanically more robust, with fewer component parts as the connection between the thermal fuse body and the base of the source of heat is direct.
- the diameter of the heating element is also smaller, advantageously equal to approximately 6,5 mm.
- Figure 1 shows a heating element according to the invention
- Figures 2a and 2b show side views of a component of the heating element in
- Figures 3a and 3b shows two embodiments of the component of Figures 2a and
- FIG. 1 shows a heating element, globally indicated by numeral 1 , which comprises a cylindrical-shape immersed casing 2, although different shapes are possible.
- Element 1 is generally fixed to the wall of a container in which the liquid to be heated is contained, e.g. the tank of a washing machine.
- a heating electrical resistor 3 e.g. spiral-shaped, but obviously it can be made in other shapes.
- Resistor 3 is connected to a first pin 5, preferably formed by copper or iron.
- pin 5 is connected to an electrically conducting metal connector 10, preferably but not necessarily formed by copper.
- Connector 10 advantageously consists of a first cylindrical part 7, longitudinally cleft to provide the cylindrical part with an elasticity which allows to secure cylindrical pin 5.
- Connector 10 further comprises a second cylindrical part 9, of larger diameter than that of first part 7. This second part 10 is also longitudinally cleft to provide it with an elastic securing capacity on a thermal fuse 1 1.
- the two cylindrical parts 7 and 9 of connector 10, thus provided with a certain radial elasticity, are joined by a third fitting part 8 having a solid surface obtained by rotating a right-angled trapezium about the side perpendicular to the bases, i.e. an essentially truncated-cone shape.
- this third part 8 has a half truncated-cone shape, corresponding to a 180° rotation of said right-angled trapezium.
- connector 10 may consists of a foil which in its open and flat shape comprises two flat rectangular surfaces joined by a further surface.
- this further surface is rectangular and the geometric configuration shown in Figures 2a and 2b is obtained by folding said foil.
- this further surface is trapezoidal and a third, essentially truncated-cone-shaped fitting part 8 is obtained by folding the foil.
- a material such as for example a resin, which insulates connector 10 and keeps it fixed with respect to the structure of heating element, to avoid detachment, vibrations, etc., may be advantageously incorporated around cylindrical part 7 of connector 10.
- Thermal fuse 1 1 has a cylindrical shape and is in turn connected to a second pin 12 which connects to the power supply system, e.g. by means of electrical wires (not shown).
- an insulating coating of plastic material or other suitable material e.g. in the shape of a bush 13, over all or part of the surface.
- An insulating socket 15 closing the casing is further provided.
- the space inside casing 2 comprised between pin 12, bushing 13 and socket 15 may be filled with sealing resin.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT000676A ITRM20060676A1 (en) | 2006-12-15 | 2006-12-15 | HEATING ELEMENT |
PCT/EP2007/063982 WO2008071794A1 (en) | 2006-12-15 | 2007-12-14 | Heating element |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2123119A1 true EP2123119A1 (en) | 2009-11-25 |
EP2123119B1 EP2123119B1 (en) | 2013-06-19 |
Family
ID=38288474
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07857616.2A Active EP2123119B1 (en) | 2006-12-15 | 2007-12-14 | Heating element |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP2123119B1 (en) |
CN (1) | CN101637061A (en) |
ES (1) | ES2427996T3 (en) |
HK (1) | HK1138149A1 (en) |
IT (1) | ITRM20060676A1 (en) |
WO (1) | WO2008071794A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009005481B3 (en) * | 2009-01-21 | 2010-04-08 | Bleckmann Gmbh & Co. Kg | Connecting element for heating coil for tubular heater and production method thereof |
KR101617298B1 (en) | 2014-08-22 | 2016-05-02 | 엘지전자 주식회사 | Dishwasher |
JP6437865B2 (en) * | 2015-03-26 | 2018-12-12 | 京セラ株式会社 | heater |
EP3109564B1 (en) * | 2015-06-24 | 2019-08-07 | Bleckmann GmbH & Co. KG | Terminal device for a tubular heating device with integrated fuse |
CN105934007B (en) * | 2016-05-06 | 2019-03-19 | 武汉航空仪表有限责任公司 | A kind of packaging method of sheathed heater |
IT201800003914A1 (en) * | 2018-03-26 | 2019-09-26 | Irca Spa | FLUID HEATING DEVICE FOR HOUSEHOLD APPLIANCES |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1169499B (en) * | 1983-09-15 | 1987-05-27 | I R C A Ind Resistenze Corazza | SELF-PROTECTED ARMORED ELECTRIC HEATING ELEMENT |
DE4243894A1 (en) * | 1991-12-24 | 1993-07-15 | Eltra Gmbh & Co Kg Leicht & Tr | Tubular heater with a thermal cut=out - has temp. dependent circuit breaker in tube screwed onto heating coil terminal in heater jacket. |
DE29800704U1 (en) * | 1998-01-16 | 1999-05-20 | Elpag Ag Chur | Tubular heating element with fuses in both ends |
-
2006
- 2006-12-15 IT IT000676A patent/ITRM20060676A1/en unknown
-
2007
- 2007-12-14 WO PCT/EP2007/063982 patent/WO2008071794A1/en active Application Filing
- 2007-12-14 CN CN200780046454A patent/CN101637061A/en active Pending
- 2007-12-14 EP EP07857616.2A patent/EP2123119B1/en active Active
- 2007-12-14 ES ES07857616T patent/ES2427996T3/en active Active
-
2010
- 2010-05-24 HK HK10105033.6A patent/HK1138149A1/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO2008071794A1 * |
Also Published As
Publication number | Publication date |
---|---|
HK1138149A1 (en) | 2010-08-13 |
CN101637061A (en) | 2010-01-27 |
ITRM20060676A1 (en) | 2008-06-16 |
EP2123119B1 (en) | 2013-06-19 |
ES2427996T3 (en) | 2013-11-05 |
WO2008071794A1 (en) | 2008-06-19 |
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