EP1072048B1 - Verbesserung bezüglich einer temperaturregelung für elektrische heizelemente - Google Patents

Verbesserung bezüglich einer temperaturregelung für elektrische heizelemente Download PDF

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Publication number
EP1072048B1
EP1072048B1 EP99915934A EP99915934A EP1072048B1 EP 1072048 B1 EP1072048 B1 EP 1072048B1 EP 99915934 A EP99915934 A EP 99915934A EP 99915934 A EP99915934 A EP 99915934A EP 1072048 B1 EP1072048 B1 EP 1072048B1
Authority
EP
European Patent Office
Prior art keywords
sensor
bimetal
contact thermal
thermal sensor
fusible material
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
Application number
EP99915934A
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English (en)
French (fr)
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EP1072048A1 (de
Inventor
Robert Andrew O'neill
John Anthony Howarth
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.)
Otter Controls Ltd
Original Assignee
Otter Controls Ltd
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 Otter Controls Ltd filed Critical Otter Controls Ltd
Priority to EP04028228A priority Critical patent/EP1517346B1/de
Publication of EP1072048A1 publication Critical patent/EP1072048A1/de
Application granted granted Critical
Publication of EP1072048B1 publication Critical patent/EP1072048B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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

  • This invention concerns improvements relating to thermal controls for electric heating elements and particularly, though not exclusively, concerns the arrangements that are disclosed in GB-A-2 328 316 and GB-A-2 334 190.
  • GB-A-2 328 316 there are described various different chassis or carrier members adapted for attachment to a planar heating element, especially a thick film heating element, and having provision for the assembly therewith of a plurality of thermal sensors at selectably variable positions.
  • the described embodiments comprise an appliance inlet connector based upon the Otter Controls CP7 inlet connector as presently manufactured, this being an inlet connector for a cordless appliance which enables the appliance to be set down upon its base in any rotational orientation of the two, but with a plurality of limbs extending outwardly from the connector in different directions all in the same plane, each limb having provision for the mounting of one or more thermal sensors on the limb at a number of different positions.
  • the invention of GB-A-2 328 316 has as its rationale the provision of flexibility as regards the positioning of sensors on planar heating elements inter alia to accommodate the different requirements of different appliance manufacturers.
  • the contactstat thermal sensor comprises a dished disk bimetal which moves with a snap-action between oppositely dished configurations when the sensed temperature rises above a predetermined level, the bimetal movement being transferred by means of a push-rod to a pair of switch contacts.
  • the contactstat thermal sensor described in GB-A-2 334 190 provides only a primary level of thermal protection, namely it has no facility for provision of a secondary or back-up level of protection to be operative in the event, however unlikely, of failure of the primary protection, for example due to failure of the bimetal or welding together of the switch contacts.
  • EP-A-0 014 102 discloses a contact thermal sensor according to the preamble of claim 1 comprising a bimetallic actuator in the form of a dished disk bimetal which is movable with a snap action between oppositely dished configurations, the bimetallic actuator being arranged to operate a set of switch contacts in normal operation of the sensor, and wherein a member comprising fusible material is arranged to disrupt an electrical path through the sensor in the event that the primary protection afforded by the bimetal and the switch contacts fails to operate and the fusible material is subjected to a temperature above the normal operating temperature of the bimetal.
  • the invention provides a contact thermal sensor comprising a bimetallic actuator in the form of a dished disk bimetal which is movable with a snap action between oppositely dished configurations, the bimetallic actuator being arranged to operate a set of switch contacts in normal operation of the sensor, and wherein a member comprising fusible material is arranged to disrupt an electrical path through the sensor in the event that the primary protection afforded by the bimetal and the switch contacts fails to operate and the fusible material is subjected to a temperature above the normal operating temperature of the bimetal, characterized in that the set of switch contacts is arranged to be operated by means of a push rod responsive to movement of the periphery of the bimetal as it snaps between its oppositely dished configurations, the push rod co-operating with one end of an elongate spring member which extends over at least one abutment that serves to stress the spring member and at its other end co-operates with said member comprising fusible material for determining the condition of said electrical path
  • the contactstat thermal sensor shown therein comprises an auto-resetting dished disk bimetal 1, a push-rod 2 and a pair of switch contacts 3 and 4, the contact 3 constituting the moving contact of the switch contacts and being affixed to one end of a spring-metal beam 5, and the contact 4 constituting the fixed contact of the switch and being affixed to a pressed metal terminal part 6 of the device.
  • a body part 7 of the contactstat is formed of a temperature resistant plastics or ceramics material and has a bore 8 which serves to accommodate the push-rod 2.
  • the disk bimetal 1 is accommodated on top of the body part 7 within a pressed metal cap 9, formed of copper or aluminium for example, which is adapted to be clenched onto the upper end of the body part 7.
  • the bimetal 1 sits under the cap 9 with its edge resting on the upper end of the push-rod 2 on one side of the bimetal disk and on a small projection 10 on the diametrically-opposite side of the disk.
  • a central depression 11 in the centre of the cap 9 provides an abutment with the bimetallic disk 1 and can be adjusted by deformation of the cap to adjust the bimetal operation.
  • a second body part 12 of the contactstat is adapted to fit together with the first-mentioned body part 7 so as to capture the beam 5, the terminal part 6 and a further terminal part 13 between the two body parts.
  • the two terminal parts 6 and 13 have portions 14 and 15 respectively which, when the two body parts 7 and 12 are fitted together, extend outside of the contactstat body for making spring contact with terminal pads provided on a thick film heating element the temperature of which is to be controlled by the contactstat.
  • the cap 9 has a radial extension 16 which is designed to accommodate the upper end of a rod 17 of fusible material, a thermoplastics material for example, and an opening 18 is formed in the body part 7 for admitting the lower end of the rod 17 to the internal chamber that is defined when the body parts 7 and 12 are fitted together.
  • the lower end of the rod 17 abuts the end of spring-metal beam 5 opposite to the end which carries the moving switch contact 3, the beam 5 being upturned at the respective end 19 for ensuring positive location of the rod 17 with the respective beam end 19 and ensuring that only axial forces are exerted on the rod 17.
  • Locating lugs 20 are provided on the elongate edges of the beam 5 and co-operate with formations 21 provided in the body parts 7 and 12 to locate the beam appropriately when the contactstat is being assembled.
  • An upstand 22 on the body part 12 is provided for applying an upwards thrust at an appropriate time (as described hereinafter) to the beam 5 at a location closer to the end 19 thereof than to the other end which carries the moving contact 3 of the switch.
  • the movement of the bimetal would normally allow the moving contact 3 to spring away from the fixed contact 4 without disrupting the contact established between the other end 19 of the beam 5 and the formation 23 on terminal part 13.
  • the fusible rod 17 will soften or melt and the end 19 of the beam 5 will resile out of electrical contact with the formation 23 provided on terminal part 13. The fusible rod 17 thus provides a secondary or back-up protection level which is operative in the event that the primary protection provided by the bimetal 1 fails.
  • a formation 24 is provided on the lower body part 12 to enable the contactstat to be assembled with a carrier as described in our British Patent Application No. 9717144.1 abovementioned.
  • the upstand 22 may or may not, but need not, contact the beam 5 in the cold condition of the contactstat as shown in Figure 2, since in this condition the action of the fusible rod 17 on the end 19 of the beam 5 and the abutment of the beam 5 with the formation 23 upstanding from terminal part 13 will serve to stress the beam sufficiently to ensure proper operation of the primary contacts 3, 4.
  • the rod 17 softens or melts in the secondary protection mode of the contactstat and the beam begins to resile towards its normal flat condition, thereby breaking electrical contact between the end 19 of the beam and the formation 23, only the contact of the beam with the upstand 22 will give rise to a continuing force such that the beam 5 continues to resile and opens a safe electrical gap between the beam and the terminal part 13.
  • the upstand 22 does not contact the beam 5 in the cold condition of the contactstat, the forces between the end 19 of the beam and the formation 23 on the terminal part 13 will be optimized so that silver plating of these parts for better electrical contact may not be necessary.
  • the geometry of the described and illustrated arrangement is such that, in the cold condition of the contactstat, a high force is applied to the fusible rod 17 and a lower force is applied to the push-rod 2, reflecting the lower actuating force available from the bimetallic disk.
  • the advantage of this arrangement is that a very high force is available from a short, stiff spring, namely the part of beam 5 between formation 23 and beam end 19, to initiate deformation of the fusible rod 17 at the appropriate temperature.
  • the upstand 22 provides a lower force from a longer, more resilient spring, namely the part of beam 5 between formation 23 and beam end 19, to provide sufficient deformation of rod 17 to open a safe spacing between the beam 5 and the formation 23 on terminal part 13.
  • the fusible rod 17 is preferably formed of an electrically insulating thermoplastics material, since it is in contact with the current carrying beam 5, it could be formed of a suitable eutectic metal alloy material provided with an electrically-insulating cap. Furthermore, the fusible material rod 17 could be arranged such that, in use of the contactstat, the upper end of the rod 17 directly abuts the heating element rather than being captured within the cap extension 16.
  • the beam 5 would not be stressed in the free-standing condition of the contactstat, namely before it was fitted to a heating element, and would only be stressed when the contactstat was assembled with the heating element, such assembly causing the rod 17 to be driven axially inwardly of the contactstat so as to bend the end 19 of the beam 5 over the upstand 23 on terminal part 13.

Landscapes

  • Thermally Actuated Switches (AREA)

Claims (8)

  1. Kontaktwärmesensor, umfassend ein bimetallisches Betätigungselement in der Form eines gewölbten Scheibenbimetalls (1), das durch einen Schnappvorgang zwischen entgegengesetzt gewölbten Gestaltungen beweglich ist, wobei das bimetallische Betätigungselement dazu eingerichtet ist, im normalen Betrieb des Sensors einen Satz von Schalterkontakten zu betätigen, und wobei ein Element (17), das ein schmelzbares Material umfaßt, dazu eingerichtet ist, einen elektrischen Pfad durch den Sensor zu unterbrechen, falls der Hauptschutz, der durch das Bimetall und die Schalterkontakte geboten wird, im Betrieb versagt und das schmelzbare Material einer Temperatur über der normalen Betriebstemperatur des Bimetalls ausgesetzt ist, dadurch gekennzeichnet, daß der Satz von Schalterkontakten dazu eingerichtet ist, durch eine Schubstange (2) betätigt zu werden, die auf eine Bewegung des Umfangs des Bimetalls (1) anspricht, wenn dieses zwischen seinen entgegengesetzt gewölbten Gestaltungen schnappt, wobei die Schubstange mit einem Ende eines länglichen Federelements (5) zu - sammenwirkt, das sich über zumindest ein Auflager (22, 23) erstreckt, welches dazu dient, das Federelement zu belasten, und an seinem anderen Ende mit dem Element (17), das ein schmelzbares Material umfaßt, zusammenwirkt, um den Zustand des elektrischen Pfads zu be - stimmen.
  2. Kontaktwärmesensor nach Anspruch 1, wobei der Sensor einen Sensorkörper (7) umfaßt, der mit einer wärmeleitenden Metallkappe (9) versehen ist, und das Bimetall (1) zwischen der Kappe und dem Sensorkörper gefangen ist, wobei die Kappe so geformt ist, daß sie ein Auf - lager (11) definiert, das die Position der Mitte des Bimetalls definiert.
  3. Kontaktwärmesensor nach Anspruch 2, wobei die Kappe (9) verformbar ist, um die Position des Auflagers (11) zu regulieren.
  4. Kontaktwärmesensor nach einem der vorhergehenden An sprüche, wobei das Element (17), das ein schmelzbares Material umfaßt, eine Schubstange umfaßt, die mit dem anderen Ende des länglichen Federelements (5) zusammenwirkt, um zu bestimmen, ob ein elektrischer Kontakt zwischen dem länglichen Federelement und einem Leiter (13) des Sensors hergestellt ist, oder nicht.
  5. Kontaktwärmesensor nach Anspruch 4, wobei die Schub - stange (17) aus schmelzbarem Material dazutätig ist, das Federelement (5) über ein aufrechtstehendes Teil (23) des Leiters zu biegen, wobei das aufrechtstehende Teil (23) als das Auflager dient.
  6. Kontaktwärmesensor nach Anspruch 5, wobei sich das aufrechtstehende Teil (23) des Leiters näher am anderen Ende des Federelements (5) als an seinem einen Ende befindet.
  7. Kontaktwärmesensor nach Anspruch 5 oder 6, wobei in einem Körperteil (12) des Sensors ein Aufrechtelement (22) bereitgestellt ist, wobei dieses Aufrechtelement als das Auflager dient.
  8. Kontaktwärmesensor nach einem der vorhergehenden An - sprüche, wobei sich das Element (17), das ein schmelzbares Material umfaßt, außerhalb des Umfangs des Bimetalls befindet.
EP99915934A 1998-04-14 1999-04-14 Verbesserung bezüglich einer temperaturregelung für elektrische heizelemente Expired - Lifetime EP1072048B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04028228A EP1517346B1 (de) 1998-04-14 1999-04-14 Verbesserung für eine thermische Regelung eines elektrischen Heizelements

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9807924 1998-04-14
GB9807924A GB2338110B (en) 1998-04-14 1998-04-14 Improvements relating to thermal controls for electric heating elements
PCT/GB1999/001132 WO1999053513A1 (en) 1998-04-14 1999-04-14 Improvements relating to thermal controls for electric heating elements

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP04028228A Division EP1517346B1 (de) 1998-04-14 1999-04-14 Verbesserung für eine thermische Regelung eines elektrischen Heizelements

Publications (2)

Publication Number Publication Date
EP1072048A1 EP1072048A1 (de) 2001-01-31
EP1072048B1 true EP1072048B1 (de) 2005-11-23

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ID=10830322

Family Applications (2)

Application Number Title Priority Date Filing Date
EP99915934A Expired - Lifetime EP1072048B1 (de) 1998-04-14 1999-04-14 Verbesserung bezüglich einer temperaturregelung für elektrische heizelemente
EP04028228A Expired - Lifetime EP1517346B1 (de) 1998-04-14 1999-04-14 Verbesserung für eine thermische Regelung eines elektrischen Heizelements

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP04028228A Expired - Lifetime EP1517346B1 (de) 1998-04-14 1999-04-14 Verbesserung für eine thermische Regelung eines elektrischen Heizelements

Country Status (7)

Country Link
EP (2) EP1072048B1 (de)
CN (1) CN1134807C (de)
AU (1) AU3435499A (de)
DE (2) DE69934338T2 (de)
GB (2) GB2338110B (de)
HK (1) HK1038829A1 (de)
WO (1) WO1999053513A1 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2504753Y (zh) * 2001-10-25 2002-08-07 邵志成 改良温度感应控制结构的器具插座
GB2382465B (en) * 2001-11-14 2005-07-13 Otter Controls Ltd Improvements relating to thermally-responsive switches
CN1186703C (zh) * 2002-01-14 2005-01-26 邵志成 温控器、电连接器及电热水器具
CN100356652C (zh) * 2005-09-26 2007-12-19 常熟市天银机电有限公司 单相交流电机的过载保护器
DE102007017366B3 (de) * 2007-04-12 2008-09-18 Cherry Gmbh Elektrischer Schalter
CN102969199B (zh) * 2012-11-26 2015-01-28 佛山市天朋温控器有限公司 突跳式温控器
CN103367035A (zh) * 2013-05-24 2013-10-23 亮群电子（常熟）有限公司 一种开放式温控器及其生产工艺
CN103824727B (zh) * 2014-01-14 2015-12-23 佛山市天朋温控器有限公司 一种突跳式温控器及其封装方法

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2339674C2 (de) * 1973-08-04 1989-09-21 Thermostat-und Schaltgerätebau GmbH & Co KG, 8730 Bad Kissingen Temperaturregler mit Schmelzmetallsicherung
US3943480A (en) * 1974-12-18 1976-03-09 Therm-O-Disc Incorporated Thermostat
DE7817937U1 (de) * 1978-06-15 1987-08-20 Inter Control Hermann Köhler Elektrik GmbH & Co KG, 8500 Nürnberg Temperatursicherung für elektrische Geräte
IT1110797B (it) * 1979-01-29 1986-01-06 Eaton Spa Termostato,particolarmente a bimetallo,con interruttore di sicurezza
US4472705A (en) * 1983-01-03 1984-09-18 Elmwood Sensors, Inc. Thermostatic switch with thermal override
EP0271345A3 (de) * 1986-12-12 1988-09-07 Texas Instruments Incorporated Einstellbarer Miniaturthermostat mit integriertem Übertemperaturschutz
DE3735334A1 (de) * 1987-10-19 1989-04-27 Thermostat & Schaltgeraetebau Thermisch gesteuerte elektrische schalteinrichtung
GB8807563D0 (en) * 1988-03-30 1988-05-05 Strix Ltd Electric immersion heaters
FR2656952B1 (fr) * 1990-01-05 1995-04-14 Seb Sa Coupe-circuit integre a un thermostat pour appareil electrique.
GB9105111D0 (en) * 1991-03-11 1991-04-24 Otter Controls Ltd Improvements relating to thermally-responsive switches

Also Published As

Publication number Publication date
GB2338110B (en) 2002-08-28
WO1999053513A1 (en) 1999-10-21
GB9807924D0 (en) 1998-06-10
HK1038829A1 (zh) 2002-03-28
CN1304539A (zh) 2001-07-18
GB2373926B (en) 2002-11-13
AU3435499A (en) 1999-11-01
DE69928517D1 (de) 2005-12-29
GB0216281D0 (en) 2002-08-21
EP1517346B1 (de) 2006-12-06
DE69928517T2 (de) 2006-08-10
GB2373926A (en) 2002-10-02
DE69934338T2 (de) 2007-06-28
DE69934338D1 (de) 2007-01-18
EP1072048A1 (de) 2001-01-31
EP1517346A1 (de) 2005-03-23
GB2338110A (en) 1999-12-08
CN1134807C (zh) 2004-01-14

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