EP0651412B1 - Safety device with a thermostat with an immersion rod sensor - Google Patents

Safety device with a thermostat with an immersion rod sensor Download PDF

Info

Publication number: EP0651412B1
Authority: EP; European Patent Office
Prior art keywords: rod; disk; safety system; inert; realized
Prior art date: 1993-10-29
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

Application number

EP94830343A

Other languages

German (de)

English (en)

French (fr)

Other versions

EP0651412A1 (en

Inventor

Claudio Merloni Termosanitari S.P.A. Capitanelli

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Mecar Srl

Thermowatt SpA

Original Assignee

Merloni Termosanitari SpA

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.)

1993-10-29

Filing date

1994-07-08

Publication date

1997-11-19

1994-07-08 Application filed by Merloni Termosanitari SpA filed Critical Merloni Termosanitari SpA

1995-05-03 Publication of EP0651412A1 publication Critical patent/EP0651412A1/en

1997-11-19 Application granted granted Critical

1997-11-19 Publication of EP0651412B1 publication Critical patent/EP0651412B1/en

2014-07-08 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

Images

Classifications

- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/32—Thermally-sensitive members
- H01H37/46—Thermally-sensitive members actuated due to expansion or contraction of a solid
- H01H37/48—Thermally-sensitive members actuated due to expansion or contraction of a solid with extensible rigid rods or tubes
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/002—Thermally-actuated switches combined with protective means

Definitions

the present invention relates to an improved safety system, with a thermostat with an immersion rod sensor.
the invention concerns a safety system realized in such a way to be more sensible with respect to the solutions presently available on the market.
thermostats with immersion rod sensor for water heaters and like provide a brass rod placed within a sheath that is immersed within the liquid.
the brass rod expands, dragging during its dilatation also the inner rod, and acts then on a mechanical circuit that interrupts a phase of the electric circuit, thus excluding the resistance.
thermostats is also provided with a further safety device, that intervenes in case of failure of the above mentioned device, so that in case still higher temperatures are reached, it provides to interrupt both the phases of the electric circuit.
this safety system is realized by a bimetallic disk that, in case the temperature increases up to reach a preestablished temperature, gets deformed.
Said bimetallic disk is very thin and is shaped in such a way to get deformed, when the transition temperature is reached, tripping from a concave position to a convex position or vice versa.
the bimetallic disk is now placed within a cavity of the thermostat, realized with conductive material, that contacts the liquid, therefore the warping effect is obtained on the basis of a heat transmission between said cavity, heated by the liquid, and the bimetallic disk.
Such an apparatus is known for example from FR-A-2149242, forming the base of the preamble of claim 1.
the Applicant has studied a solution concerning the safety system that allows to have greatly improved sensitibility features while sensing the temperature with respect to the prior art solutions.
thermoexpansible material a low thermal dilatation rod, provided within said thermoexpansible rod, a casing, within which said rods are introduced, in correspondence of a cavity or cup realized in thermoconductive material, and an interruption mechanism to interrupt a phase of the electric circuit, connected to said rods
said system comprising a spring element, a thermally inert thin disk, a calibration element for the safety system and an element for transmitting the strains of the inert disk element to an interruption mechanism for both the phases of the electric circuit, said elements being introduced, in the above mentioned sequence, from the bottom to the above along said low thermal dilatation rod, with the calibration element adjustable fixed to said low thermal dilatation rod in such a way to make the safety system intervening at a temperature higher than the intervention temperature of said interruption mechanism of a phase of the circuit, and said inert disk element being realized with a concavity toward the bottom and having
said spring element is made up of a synthetic rubber or metal disk, or of a disk made up of another elastic material.
said inert thin disk is made up of inert metal.
said calibration element is comprised by a metal ring screwed on a thread provided at the end of said low thermal dilatation rod, within said casing of the thermostat.
said strain transmission element of the disk element is made up of a hollow overturned cylindrical element, the outer circumference of which rests on the outer circumference of the disk element.
a thin bimetallic disk element can be provided between said elastic element and said inert disk element.
an immersion thermostat 1 is partially shown in section, said thermostat 1 including the safety system according to the present invention.
the thermostat 1 comprises a brass rod 2, soaked within the liquid, not shown, and within which a low thermal dilatation rod is provided.
the brass rod 2 expands, dragging also the inner rod 3 acting, on the basis of its displacement, on a mechanism 4 that interrupt the electric connection 5.
the safety system according to the invention in the embodiment shown in figure, is made up of a spring element 6, realized with synthetic rubber, metal or other elastic material, provided about the rod 3, within a cavity or cup 7 realized in the sheath 8 of the thermostat 1.
an inert disk 9 is provided, i.e. that does not get deformed with the variation of the temperature, and so shaped to assume, when the safety system is inoperative, the position shown in figure, but that is able to vary its bent, tripping if mechanically stressed.
a metal ring 10 is provided for the calibration of the safety system. The calibration is realized tightening the metal ring 10 on the disk 9 until the latter trips due to a certain dilatation of the brass rod 2.
a round element 11 is provided, inserted along the rod 3, said round element 11 having a C-shaped cross section, the outer circumference of which rests on the outer circumference of the disk 9.
a bimetallic disk and the inert disk 9 can be coupled, the bimetallic disk being positioned under the inert disk, i.e. contacting the spring element 6.

Landscapes

Physics & Mathematics (AREA)
Thermal Sciences (AREA)
Thermally Actuated Switches (AREA)
Measuring Temperature Or Quantity Of Heat (AREA)
Fire-Detection Mechanisms (AREA)

EP94830343A 1993-10-29 1994-07-08 Safety device with a thermostat with an immersion rod sensor Expired - Lifetime EP0651412B1 (en)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
ITRM930715A IT1262416B (it)	1993-10-29	1993-10-29	Sistema di sicurezza perfezionato, in particolare per termostato con sensore ad asta ad immersione.
ITRM930715		1993-10-29

Publications (2)

Publication Number	Publication Date
EP0651412A1 EP0651412A1 (en)	1995-05-03
EP0651412B1 true EP0651412B1 (en)	1997-11-19

Family

ID=11402027

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP94830343A Expired - Lifetime EP0651412B1 (en)	1993-10-29	1994-07-08	Safety device with a thermostat with an immersion rod sensor

Country Status (7)

Country	Link
EP (1)	EP0651412B1 (it)
AT (1)	ATE160467T1 (it)
DE (1)	DE69406893T2 (it)
DK (1)	DK0651412T3 (it)
ES (1)	ES2111892T3 (it)
GR (1)	GR3026061T3 (it)
IT (1)	IT1262416B (it)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
FR2734400B1 (fr) *	1995-05-19	1997-07-25	Cotherm Sa	Thermostat de regulation comportant dans la sonde un dispositif de securite
FR2747459B1 (fr) *	1996-04-11	1998-06-19	Cotherm Sa	Dispositif de chauffage et de regulation pourvu d'un systeme de securite a memoire de forme
ITAN20010023A1 (it) *	2001-05-28	2001-08-28	Thermowatt Spa	Termoprotettore non riarmabile a sicurezza positiva
FR2951861B1 (fr) *	2009-10-27	2011-11-25	Cotherm Sa	Thermostat hybride pour chauffe-eau electrique
IT1401027B1 (it)	2010-07-29	2013-07-12	Thermowatt Spa	Termostato elettronico ed elettromeccanico perfezionato
IT1401780B1 (it)	2010-09-22	2013-08-28	Thermowatt Spa	Termostato elettronico con sicurezza attivata da resistori.
IT201900009225A1 (it)	2019-06-17	2020-12-17	Thermowatt Spa	Termostato con mezzi rimuovibili per il blocco della taratura
CN111883386A (zh) *	2020-08-28	2020-11-03	贝克电热科技（深圳）有限公司	一种温控器

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
FR1543230A (fr) *		1900-01-01		Perfectionnements aux dispositifs de réglage thermique à sécurité incorporée
CH335739A (de) *	1955-11-15	1959-01-31	Sauter Ag	Temperaturschalter mit Übertemperatursicherung
IT947921B (it) *	1972-02-25	1973-05-30	Bdm Italia Spa	Dispositivo perfezionato per l ali mentazione il controllo termostati co di servizio ed il controllo di sicurezza per le resistenze di riscaldamento di scalda acqua e simili
FR2369674A1 (fr) *	1977-12-13	1978-05-26	Snipeliski Jacques	Perfectionnements aux dispositifs d'interrupteurs thermostatiques
FR2579013B1 (fr) *	1985-03-18	1987-04-10	Cotherm Sa	Perfectionnements aux thermostats a tube plongeur

1993
- 1993-10-29 IT ITRM930715A patent/IT1262416B/it active IP Right Grant
1994
- 1994-07-08 ES ES94830343T patent/ES2111892T3/es not_active Expired - Lifetime
- 1994-07-08 DK DK94830343T patent/DK0651412T3/da active
- 1994-07-08 AT AT94830343T patent/ATE160467T1/de not_active IP Right Cessation
- 1994-07-08 EP EP94830343A patent/EP0651412B1/en not_active Expired - Lifetime
- 1994-07-08 DE DE69406893T patent/DE69406893T2/de not_active Expired - Lifetime
1998
- 1998-02-04 GR GR980400229T patent/GR3026061T3/el unknown

Also Published As

Publication number	Publication date
DK0651412T3 (da)	1998-07-27
IT1262416B (it)	1996-06-19
ATE160467T1 (de)	1997-12-15
DE69406893D1 (de)	1998-01-02
ES2111892T3 (es)	1998-03-16
ITRM930715A1 (it)	1995-04-29
EP0651412A1 (en)	1995-05-03
DE69406893T2 (de)	1998-06-10
GR3026061T3 (en)	1998-05-29
ITRM930715A0 (it)	1993-10-29

Publication	Publication Date	Title
US2914644A (en)	1959-11-24	Oven control apparatus
US4295114A (en)	1981-10-13	Thermo-switch
EP0651412B1 (en)	1997-11-19	Safety device with a thermostat with an immersion rod sensor
US5019692A (en)	1991-05-28	Thermostatic device for fuser
US4394646A (en)	1983-07-19	Temperature indicator for a glass ceramic cooking surface
GB2181598A (en)	1987-04-23	Thermally-sensitive controls
US2194118A (en)	1940-03-19	Food processing vessel
EP0630551B1 (en)	1998-01-21	Improvements relating to electrically powered immersion heating elements and controls therefor
US3041437A (en)	1962-06-26	Control device
EP0528656B1 (en)	1996-11-06	Liquid heating vessels
US4496928A (en)	1985-01-29	Temperature responsive switch
US2924700A (en)	1960-02-09	Control for cooking vessel
WO1990009672A1 (en)	1990-08-23	Immersion heaters
GB2185857A (en)	1987-07-29	Controls for vessels for heating liquids
GB2206734A (en)	1989-01-11	Thermally responsive electrical device
GB2071913A (en)	1981-09-23	Thermostat
US3530419A (en)	1970-09-22	Thermostat
US2058426A (en)	1936-10-27	Thermostat
US3051814A (en)	1962-08-28	Temperature responsive system
US3083283A (en)	1963-03-26	Temperature control attachment for a utensil
GB2055248A (en)	1981-02-25	Electric liquid heating containers
GB2023818A (en)	1980-01-03	Temperature-responsive actuating-elements
CN1811650B (zh)	2012-05-23	液体加热容器中的温度控制
US3083287A (en)	1963-03-26	Cooking temperature control apparatus
GB2345597A (en)	2000-07-12	Thermal protection

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