WO2006108622A1 - Armoured electrical resistance element - Google Patents

Armoured electrical resistance element Download PDF

Info

Publication number
WO2006108622A1
WO2006108622A1 PCT/EP2006/003347 EP2006003347W WO2006108622A1 WO 2006108622 A1 WO2006108622 A1 WO 2006108622A1 EP 2006003347 W EP2006003347 W EP 2006003347W WO 2006108622 A1 WO2006108622 A1 WO 2006108622A1
Authority
WO
WIPO (PCT)
Prior art keywords
resistance element
electrical resistance
armoured
temperature
sheath
Prior art date
Application number
PCT/EP2006/003347
Other languages
French (fr)
Inventor
Duilio Capraro
Andrea Virzi
Original Assignee
I.R.C.A. S.P.A. Industria Resistenze Corazzate E Affini
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by I.R.C.A. S.P.A. Industria Resistenze Corazzate E Affini filed Critical I.R.C.A. S.P.A. Industria Resistenze Corazzate E Affini
Publication of WO2006108622A1 publication Critical patent/WO2006108622A1/en

Links

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
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • H05B3/44—Heating elements having the shape of rods or tubes non-flexible heating conductor arranged within rods or tubes of insulating material
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00—Thermometers specially adapted for specific purposes
    • 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
    • H05B2203/019—Heaters using heating elements having a negative temperature coefficient

Definitions

  • the present invention relates to an armoured electrical resistance element.
  • Armoured electrical resistance elements consisting of a resistive wire housed in a metal sheath or armouring and kept electrically isolated therefrom by magnesium oxide powder.
  • the sheath is substantially of M-shape with the ends of the straight portions retained by a metal flange to be removably fixed to the drum of the dishwasher, washing machine, etc.
  • Terminals connected to the ends of the resistive wire emerge from the ends of the straight portions, and to which the electrical powering contacts of the resistance element are connected.
  • the electrical resistance element may operate under different and more severe conditions than those intended, hence a safety fuse is provided inside the sheath to interrupt operation of the element if it becomes overheated.
  • a sensor generally of NTC type, is mounted on that flange surface facing the fluid to be heated, to interrupt power to the resistance element when the fluid reaches the predetermined temperature.
  • the armoured resistance element comprises substantially a resistive wire 2 inserted into a metal sheath 4 and maintained electrically separated therefrom by magnesium oxide powder 6.
  • a traditional fuse 12 is inserted between the resistive wire 2 and the terminal 8, which emerges from the armoured resistance element via an insulating plug 10.
  • an NTC sensor 14 mounted on a base 16 provided with a cable 18 for its connection to an electronic circuit comprising a TRIAC either outside or inside the sheath, its purpose being to check the temperature and to interrupt the mains electricity or allow it to pass, depending on the signal received.
  • the resistance element according to the invention is mounted by inserting it through the standard hole provided in the drum of the washing machine or in the base of the dishwasher, fixing it thereto by means of the flange. The resistance element is then powered to provide the energy required to attain the predetermined temperature.
  • the operating temperature is to be 60°C, this temperature then being set for the NTC sensor by means of the circuit comprising the TRIAC.
  • the NTC sensor can be influenced both by the fluid temperature and by the temperature of the resistive wire, these data being fed to the TRIAC which controls correct operation.
  • the NTC sensor senses this condition and indicates this fact to the TRIAC which then interrupts electrical power.
  • the TRIAC by means of the NTC sensor, senses this incorrect temperature increase, and interrupts power even if the fluid has not reached the predetermined temperature.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Resistance Heating (AREA)

Abstract

An armoured electrical resistance element comprising a resistive wire (2) housed in a metal sheath (4) and maintained electrically isolated therefrom by a dielectric support (6), characterised in that said support also houses in its interior at least one NTC sensor (14) connected to an electrical power control unit. The device finds application as a heating element for e.g. washing machines and dishwashers.

Description

ARMOURED ELECTRICAL RESISTANCE ELEMENT
The present invention relates to an armoured electrical resistance element.
Armoured electrical resistance elements are known consisting of a resistive wire housed in a metal sheath or armouring and kept electrically isolated therefrom by magnesium oxide powder. The sheath is substantially of M-shape with the ends of the straight portions retained by a metal flange to be removably fixed to the drum of the dishwasher, washing machine, etc.
Terminals connected to the ends of the resistive wire emerge from the ends of the straight portions, and to which the electrical powering contacts of the resistance element are connected.
Notwithstanding correct sizing, successful trials, positive insulation testing and correct operation, and especially in the case of an equipment fault, the electrical resistance element may operate under different and more severe conditions than those intended, hence a safety fuse is provided inside the sheath to interrupt operation of the element if it becomes overheated.
A sensor, generally of NTC type, is mounted on that flange surface facing the fluid to be heated, to interrupt power to the resistance element when the fluid reaches the predetermined temperature. These known resistance elements present however the drawback that the temperature of the element sheath is not measured by the NTC sensor in the region surrounding it.
In this respect, if the element armouring is covered by incrustations such as limestone, the element has to increase its temperature in order to supply the energy required to attain the predetermined temperature, this temperature increase possibly blowing the fuse. These drawbacks are eliminated according to the invention by an armoured electrical resistance element as described in claim 1.
The present invention is described in further detail hereinafter with reference to the accompanying drawing, which shows a longitudinal section through a resistance element according to the invention.
As can be seen from the figure, the armoured resistance element according to the invention comprises substantially a resistive wire 2 inserted into a metal sheath 4 and maintained electrically separated therefrom by magnesium oxide powder 6. A traditional fuse 12 is inserted between the resistive wire 2 and the terminal 8, which emerges from the armoured resistance element via an insulating plug 10.
Inside the sheath there is also inserted an NTC sensor 14 mounted on a base 16 provided with a cable 18 for its connection to an electronic circuit comprising a TRIAC either outside or inside the sheath, its purpose being to check the temperature and to interrupt the mains electricity or allow it to pass, depending on the signal received.
The resistance element according to the invention is mounted by inserting it through the standard hole provided in the drum of the washing machine or in the base of the dishwasher, fixing it thereto by means of the flange. The resistance element is then powered to provide the energy required to attain the predetermined temperature.
It will be assumed that the operating temperature is to be 60°C, this temperature then being set for the NTC sensor by means of the circuit comprising the TRIAC. During heating, the NTC sensor can be influenced both by the fluid temperature and by the temperature of the resistive wire, these data being fed to the TRIAC which controls correct operation.
When the fluid temperature reaches 6O0C, the NTC sensor senses this condition and indicates this fact to the TRIAC which then interrupts electrical power.
If however the armouring is covered by a layer of limestone, because of which the temperature of the resistive wire increases without heating the fluid to the predetermined temperature, the TRIAC, by means of the NTC sensor, senses this incorrect temperature increase, and interrupts power even if the fluid has not reached the predetermined temperature.

Claims

- A -C L A I M S
1. An armoured electrical resistance element comprising a resistive wire (2) housed in a metal sheath (4) and maintained electrically isolated therefrom by a dielectric support (6), characterised in that said support also houses in its interior at least one NTC sensor (14) connected to an electrical power control unit.
2. A resistance element as claimed in claim 1 , characterised in that the NTC sensor is connected to a TRIAC,
3. A resistance element as claimed in claim 2, characterised in that the TRIAC is housed within the sheath.
PCT/EP2006/003347 2005-04-15 2006-04-12 Armoured electrical resistance element WO2006108622A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITVE2005A000024 2005-04-15
ITVE20050024 ITVE20050024A1 (en) 2005-04-15 2005-04-15 ARMORED ELECTRIC RESISTANCE.

Publications (1)

Publication Number Publication Date
WO2006108622A1 true WO2006108622A1 (en) 2006-10-19

Family

ID=36693147

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/003347 WO2006108622A1 (en) 2005-04-15 2006-04-12 Armoured electrical resistance element

Country Status (2)

Country Link
IT (1) ITVE20050024A1 (en)
WO (1) WO2006108622A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITBG20090063A1 (en) * 2009-12-09 2011-06-10 Niro Plan Ag VENTILATED OVEN AND METHOD TO PROVIDE HOT AIR TO A VENTILATED OVEN.
EP2336650A3 (en) * 2009-12-09 2013-01-02 Franke Technology and Trademark Ltd Fan oven and method for supplying hot air to a fan oven
IT201700091796A1 (en) * 2017-08-08 2019-02-08 Irca Spa Method and device for measuring temperature in electrical power resistors
US11098830B2 (en) 2017-07-31 2021-08-24 Faster S.R.L. Quick connector with semi-integrated cartridge

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3546436A (en) * 1966-11-11 1970-12-08 Walter K Holzer Electronic heat regulation
EP1081986A2 (en) * 1999-09-02 2001-03-07 Bleckmann GmbH Tubular heating element with NTC/PTC protection
EP1293597A2 (en) * 2001-09-17 2003-03-19 Bleckmann GmbH Flat heating element for the direct heating of a medium

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3546436A (en) * 1966-11-11 1970-12-08 Walter K Holzer Electronic heat regulation
EP1081986A2 (en) * 1999-09-02 2001-03-07 Bleckmann GmbH Tubular heating element with NTC/PTC protection
EP1293597A2 (en) * 2001-09-17 2003-03-19 Bleckmann GmbH Flat heating element for the direct heating of a medium

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITBG20090063A1 (en) * 2009-12-09 2011-06-10 Niro Plan Ag VENTILATED OVEN AND METHOD TO PROVIDE HOT AIR TO A VENTILATED OVEN.
EP2336650A3 (en) * 2009-12-09 2013-01-02 Franke Technology and Trademark Ltd Fan oven and method for supplying hot air to a fan oven
US11098830B2 (en) 2017-07-31 2021-08-24 Faster S.R.L. Quick connector with semi-integrated cartridge
IT201700091796A1 (en) * 2017-08-08 2019-02-08 Irca Spa Method and device for measuring temperature in electrical power resistors
WO2019030690A1 (en) * 2017-08-08 2019-02-14 I.R.C.A. S.P.A. Industria Resistenze Corazzate E Affini Method and device for measuring the temperature in electric power resistors
CN111630358A (en) * 2017-08-08 2020-09-04 I.R.C.A.（共同）股份公司工业铠装及类似电阻 Method and apparatus for measuring the temperature of an electrical power resistor
CN111630358B (en) * 2017-08-08 2022-07-05 I.R.C.A.（共同）股份公司工业铠装及类似电阻 Method and apparatus for measuring the temperature of an electrical power resistor
US11566949B2 (en) 2017-08-08 2023-01-31 I.R.C.A. S.P.A. Industria Resistenze Corazzate E Affini Method and device for measuring the temperature in electric power resistors

Also Published As

Publication number Publication date
ITVE20050024A1 (en) 2006-10-16

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