EP0624998B1 - Safety device for heating elements in temperature-controlled home appliances - Google Patents
Safety device for heating elements in temperature-controlled home appliances Download PDFInfo
- Publication number
- EP0624998B1 EP0624998B1 EP94201204A EP94201204A EP0624998B1 EP 0624998 B1 EP0624998 B1 EP 0624998B1 EP 94201204 A EP94201204 A EP 94201204A EP 94201204 A EP94201204 A EP 94201204A EP 0624998 B1 EP0624998 B1 EP 0624998B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- safety device
- heating elements
- sensitive element
- temperature
- heat
- 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.)
- Expired - Lifetime
Links
Images
Classifications
-
- 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
- D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
- D06F34/14—Arrangements for detecting or measuring specific parameters
- D06F34/22—Condition of the washing liquid, e.g. turbidity
- D06F34/24—Liquid temperature
-
- 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
-
- 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
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/16—Washing liquid temperature
-
- 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
Definitions
- the present invention relates to a safety device for heating elements in temperature-controlled home appliances, such as washing machines, washer-driers, dishwashers, deep-friers and such like.
- Such overheating can be caused by the lack of the fluid to be heated, typically water in the case of washing machines, air flow in the case of washer-driers and cooking oil in the case of deep-friers.
- the absence of water inside the cylinder causes a fast increase in the temperature of the heating resistance, and the possible burning of its insulator coating; this is clearly dangerous, as it involves the formation of an electrical short-circuit when the water inside the cylinder shall once again come into contact with the resistance.
- Safety devices are known that are constituted by power supply switches triggered by devices sensitive to the external temperature of the heating resistance.
- Such devices are dedicated solely to a function of surveillance of the temperature of the heating element, separate devices being always provided to control the temperature of the fluid to be heated; the latter are constituted by thermostats endowed with heat-sensitive elements immersed in the fluid itself. This is naturally reflected on costs of production.
- WO-A-92/056 75 discloses a safety device as set forth in the preamble of claim 1.
- the safety device is however affected by scarce precision in the control of the temperature of the fluid, because the temperature of the latter is sensed by a thermally-responsive control means outside the liquid chamber through a heat conduction link.
- the object of the present invention is to provide a safety device that integrates the function of controlling the temperature of the fluid.
- said heat-sensitive element is fastened mechanically to a flange wherein said heating elements are fastened to the chassis of the home appliance.
- the present invention it is possible to provide a safety device integrating the function of precisely controlling the temperature of the fluid, with a consequent saving of components and thus of costs of production.
- a first type of heating element is constituted by an armoured resistance 1, provided with a flange 2 for mounting on a chassis 3 of a home appliance; the flange 2 comprises two opposite metal plates 4, between which there is interposed a rubber seal 5. It is also provided with a pair of through holes 6 wherein there are inserted as many terminals 7 of the resistance 1; a third through hole 8 allows the insertion of an immersion thermostat 9, say of the non-adjustable type with trigger temperatures of 30°C and 90°C, whose heat-sensitive element 10 is provided with an elastic clip 11 in thermally-conducting material for connecting to the resistance 1.
- the resistance 1 is located in the space between the bottom of the tank 16 and the bottom of the loading cylinder 17 (visible in Fig. 5); when the tank 16 has been filled with water, both the resistance 1 and the heat-sensitive element 10 of the thermostat 9 are immersed.
- the heating step is reached, power is applied across the terminals 7 of the resistance 1; the passage of current in the resistance 1 causes it to heat up, and the water is also consequently heated up.
- the heat-sensitive element 10 as well as controlling, in a manner known in itself, the temperature of the water during the washing cycle, also controls, through the clip 11, the temperature of the resistance 1 and, when this exceeds a given value, it triggers the switch 15 that cuts voltage from across the terminals 7 of the resistance 1.
- a second type of heating element constituted by an armoured resistance with a longer linear extension with respect to the resistance 1.
- a corresponding flange 19, similar to the flange 2, is again provided with through holes 20 wherein there are inserted as many terminals 21 of the resistance 18, and, in a central position, with a through hole 22 in which the thermostat 9 is inserted; the heat-sensitive element 10 is provided with a clamp 23 in a thermally-conducting material tightly attached to the resistance 18 by means of a rivet 24.
- a lever 25 is hinged between two brackets 26 and allows, through two cams 27 (Figs. 5 and 6), the clamping of the two plates 4 of the flange 9 so as to compress the seal 5 and consequently clamp the resistance 18 and the thermostat 9.
- thermostat 9 has, however, been replaced by a sensor bulb 29 that operates by expansion of a fluid, say, oil, inside a capillary 30 forming part of an adjustable thermostat; in such thermostats, commonly available commercially, the bulb 29 has dimensions that are unified with those of the thermostat 9.
- the sensor bulb 29 is connected to the resistance 1 by means of an elastic clip 11.
- FIG. 11 there is shown a third type of heating element constituted by an armoured resistance 31, provided with a flange 2 identical to that shown in Figs. 1, 2, 9 and 10.
- This solution again uses an adjustable thermostat provided with a fluid-expansion sensor bulb 32, that is again provided with a capillary 30 and is in thermal and mechanical contact with the resistance 31 by means of a capillary 33, containing the expandable fluid, connected to the resistance 31 by means of an elastic clip 34.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Control Of Resistance Heating (AREA)
- Resistance Heating (AREA)
- Electric Stoves And Ranges (AREA)
Description
Claims (7)
- Safety device for immersion heating elements (1,18,31) in home appliances with a fluid subjected to temperature control, comprising a heat sensitive element (10,29,32) and thermally-conducting means (11,23,33) coupling thermally and mechanically the heating elements to the heat sensitive element so that a temperature of the heating elements is controlled by the heat sensitive element through said thermally-conducting means, characterized in that said heat sensitive element is part of a thermostat (9) and is immersed in said fluid for directly controlling a temperature of the fluid, so that a combined control of the temperature of the heating elements and of the temperature of the fluid is achieved.
- Safety device according to claim 1, characterized in that said heat-sensitive element (10, 29, 32) is mechanically fastened to a flange (2, 19, 35) with which said heating elements (1, 18, 31) are provided for their mounting on the chassis (3) of the home appliance.
- Safety device according to claim 2, characterized in that said flange (2, 19, 35) comprises two opposite metal plates (4), with the interposition of a seal (5), there being provided mechanical means (13; 25, 26, 27; 28) for compressing said seal (5) to accomplish the clamping of said heating elements (1, 18, 31) and of said heat-sensitive element (10, 29, 32).
- Safety device according to claim 3, characterized in that said mechanical means (13; 25, 26, 27; 28) are constituted by at least one threaded tie rod (13; 28) and by a respective fastening nut (4).
- Safety device according to claim 3, characterized in that said mechanical means (13; 25, 26, 27; 28) are constituted by two brackets (26) fastened to one of the plates (4) of the flange (2, 19, 35) and by a lever (25) hinged on said brackets (26) and provided with two cams (27) operating the other of said plates (4).
- Safety device according to claim 1, characterized in that said thermally-conducting means (11, 23, 33) are constituted by an elastic clip (11) for connecting to said heating elements (1), applied to the heat-sensitive element (10, 29).
- Safety device according to claim 1, characterized in that said thermally-conducting means (11, 23, 33) are constituted by a clamp (23) applied to the heat-sensitive element (10) and tightly attached to said heating elements (18) by means of a rivet (24).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI930942 | 1993-05-11 | ||
IT93MI000942A IT1264405B1 (en) | 1993-05-11 | 1993-05-11 | SAFETY DEVICE FOR HEATING ELEMENTS IN TEMPERATURE CONTROLLED HOUSEHOLD APPLIANCES |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0624998A1 EP0624998A1 (en) | 1994-11-17 |
EP0624998B1 true EP0624998B1 (en) | 1999-01-13 |
Family
ID=11366096
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94201204A Expired - Lifetime EP0624998B1 (en) | 1993-05-11 | 1994-05-02 | Safety device for heating elements in temperature-controlled home appliances |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0624998B1 (en) |
DE (1) | DE69415860T2 (en) |
ES (1) | ES2127345T3 (en) |
IT (1) | IT1264405B1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9400543D0 (en) * | 1994-01-13 | 1994-03-09 | Strix Ltd | Water heating apparatus |
GB2306284A (en) * | 1995-07-19 | 1997-04-30 | Otter Controls Ltd | Electric heating elements |
KR100662390B1 (en) * | 2005-12-09 | 2007-01-02 | 엘지전자 주식회사 | Steam generator, controlling method of the stream generator, cleaner and controlling method of the cleaner using the same |
WO2008096915A1 (en) | 2007-02-06 | 2008-08-14 | Lg Electronics Inc. | Heating apparatus, and steam generator and home appliance using the same |
IT1391862B1 (en) | 2008-09-23 | 2012-01-27 | Indesit Co Spa | WASHING MACHINE, IN PARTICULAR A WASHING MACHINE, A WASHING MACHINE OR A DISHWASHER PROVIDED WITH A TEMPERATURE DETECTION DEVICE FOR THE ELECTRIC HEATING WARMING RESISTANCE OF THE WASHING LIQUID. |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1237240B (en) * | 1955-09-20 | 1967-03-23 | Licentia Gmbh | Temperature-dependent switching device |
DE1815429B2 (en) * | 1967-12-28 | 1971-12-09 | Elpag Ag Chur, Chur (Schweiz) | ELECTRIC HEATING INSERT |
US3750429A (en) * | 1971-03-26 | 1973-08-07 | Westinghouse Electric Corp | Control for an automatic washer |
EP0275635A1 (en) * | 1986-12-15 | 1988-07-27 | Redring Electric Limited | Immersion heaters |
US5459812A (en) * | 1990-09-17 | 1995-10-17 | Strix Limited | Immersion heaters including sheet metal heat conduction link |
-
1993
- 1993-05-11 IT IT93MI000942A patent/IT1264405B1/en active IP Right Grant
-
1994
- 1994-05-02 ES ES94201204T patent/ES2127345T3/en not_active Expired - Lifetime
- 1994-05-02 DE DE69415860T patent/DE69415860T2/en not_active Expired - Fee Related
- 1994-05-02 EP EP94201204A patent/EP0624998B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
IT1264405B1 (en) | 1996-09-23 |
ITMI930942A1 (en) | 1994-11-11 |
ES2127345T3 (en) | 1999-04-16 |
DE69415860T2 (en) | 1999-07-29 |
DE69415860D1 (en) | 1999-02-25 |
EP0624998A1 (en) | 1994-11-17 |
ITMI930942A0 (en) | 1993-05-11 |
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