EP2227818A2 - Dispositif de securite thermique - Google Patents
Dispositif de securite thermiqueInfo
- Publication number
- EP2227818A2 EP2227818A2 EP09719749A EP09719749A EP2227818A2 EP 2227818 A2 EP2227818 A2 EP 2227818A2 EP 09719749 A EP09719749 A EP 09719749A EP 09719749 A EP09719749 A EP 09719749A EP 2227818 A2 EP2227818 A2 EP 2227818A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- lever
- safety device
- thermal safety
- contact
- metal strip
- 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
- 239000002184 metal Substances 0.000 claims abstract description 26
- 239000000758 substrate Substances 0.000 claims abstract description 20
- 238000003825 pressing Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 description 16
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000013021 overheating Methods 0.000 description 3
- 229910000679 solder Inorganic materials 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 210000003298 dental enamel Anatomy 0.000 description 2
- 238000010292 electrical insulation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000005493 welding type Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/36—Means for applying mechanical tension to fusible member
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
- H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
- H01H37/761—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/20—Bases for supporting the fuse; Separate parts thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/04—Bases; Housings; Mountings
- H01H2037/046—Bases; Housings; Mountings being soldered on the printed circuit to be protected
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
- H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
- H01H37/761—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit
- H01H2037/762—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit using a spring for opening the circuit when the fusible element melts
- H01H2037/763—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit using a spring for opening the circuit when the fusible element melts the spring being a blade spring
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/0241—Structural association of a fuse and another component or apparatus
- H01H2085/0275—Structural association with a printed circuit board
Definitions
- the present invention relates to a thermal safety device for a heating element deposited on a substrate forming a heating subassembly included in particular in a household appliance.
- Document EP 0654170 discloses a temperature-sensitive circuit breaker intended to be fixed on a substrate, comprising a spring blade provided at each of its ends with a contact welded to a corresponding contact pad on the substrate. Between the two welded contacts, the spring blade comprises an arm consisting of a roof-shaped portion followed by a flat section.
- the circuit breaker is activated by applying a pressure on the roof which generates a bending of the flat section and a lifting torque of the contact located next to the section.
- the solder contact melts and the lifting torque causes a lateral displacement of the contact that opens the circuit.
- the opening of the contact is generated by a low deformation of the roof, which imposes a very good control of the dimensions of the spring and the various parts putting pressure on the roof.
- this type of circuit breaker requires significant contact spacing to accommodate the roof-shaped portion and the flat portion.
- Document WO 98/20510 also discloses a thermal safety device comprising a metal blade welded to a substrate between two contact pads.
- the blade has a cantilever end which is mechanically stressed by a wall of a housing. During overheating at the contact pads, the welds melt and the stress exerted on the end of the blade causes the opening of the circuit by spacing the contact located opposite the end cantilevered.
- this thermal safety device works only if the two welds of the pads melt simultaneously, which imposes the same thermal environment for each pad.
- the metal blade with its end cantilever is long and therefore difficult to implement in a small footprint.
- the object of the present invention is to overcome the aforementioned drawbacks and to provide a thermal safety device which has high reliability and safe operation.
- Another object of the invention is to provide a thermal safety device that is simple and economical to implement.
- Another object of the invention is to provide a thermal safety device that is compact to be installed in a small footprint.
- a thermal safety device intended to be fixed on a substrate comprising a fuse blade comprising a metal strip provided with a first contact zone electrically connected to a first pad on the substrate and also provided with at least one another contact zone capable of being welded to another pad on the substrate, the fuse blade also comprising a lever comprising a free end, not connected to the metal band, characterized in that the lever generates a tilting torque of the zone of welded contact, around at least one pivot point disposed between the two contact zones when pressing on the end of the lever.
- the thermal safety device thus produced comprises a fuse blade whose shape is stable when soldered on the substrate and the device is then activated by pressing on the end of the lever.
- the pivot point around which the tilting torque is generated by the lever is located between the two contact zones, which allows a compact construction of the device.
- the support on the end of the lever is located outside the two contact zones.
- This arrangement makes it possible to obtain a sufficiently long lever arm to guarantee, during an overheating of the device, a displacement of the zone of contact with the pad with an even greater margin of safety for electrical insulation.
- the lever comprises two arms arranged laterally to the metal strip.
- This arrangement makes it possible to balance the forces generating the tilting torque of the welded contact zone.
- each arm of the lever comprises stiffening means.
- This arrangement makes it possible to avoid bending the arms of the lever in order to transmit the tilting torque to the welded contact zone.
- the stiffening means of each arm of the lever are formed by a longitudinal fold.
- the metal strip comprises at least two folds located between the pivot point and the first contact zone.
- This arrangement makes it possible to create additional pivot points which amplify the opening of the contact zone.
- the metal strip and the lever are formed in the same metal strip.
- This arrangement makes it possible to produce the fuse blade of the thermal safety device in a simple and economical manner.
- At least the welded contact zone is brazed by reflow.
- FIG. 1 illustrates a perspective view of an activated thermal safety device according to a particular embodiment of the invention.
- FIG. 2 illustrates a perspective view of a fuse blade of the thermal safety device of FIG. 1.
- FIG. 3 illustrates a perspective view of the thermal safety device of Figure 1, the fuse blade is welded to a substrate before pressing the lever.
- FIG. 4 illustrates a perspective view of the thermal safety device of Figure 1 after melting of the welded contact.
- the thermal safety device is incorporated in a heating base for a liquid heating device.
- the thermal safety device comprises a fusible blade 20 fixed on a substrate 2 comprising a metal disk 3 of stainless steel provided with a screen-printed heating resistor 4 sandwiched between two layers of insulating enamels.
- the outer enamel layer comprises lights in which contact pads are deposited.
- the heating base comprises the female part of a removable connector composed of two feed pins 11, 12 welded to two contact pads 9, 10, an earth pin 13 connected directly to the metal disc 3 and an envelope plastic 15 capping the three pins 11, 12, 13.
- the heating base also comprises heating resistance control means not shown in the figure.
- the heating resistor 4 has an end provided with a hot pad 7 which remains, when the apparatus is heating, relatively hot because of the trace of the heating resistor track 4.
- the supply pin 12 is connected to a track comprising an end provided with a cold pad 8 which remains relatively cold when the device heats.
- the fuse blade 20 comprises a metal strip 21 comprising two ends each provided with a contact zone 22, 23 welded respectively to the hot pad 7 and to the cold pad 8.
- the fuse blade 20 therefore electrically connects the heating resistor 4 to the supply pin 12.
- the fuse blade 20 also comprises a lever 30 comprising two arms 34, 35 disposed laterally to the metal strip 21 and integral with the latter at the contact zone 22 welded to the hot pad 7.
- the two arms 34, 35 of the lever 30 each comprise a first portion 32, 33 parallel to the metal strip 21 and a second inclined portion 38, 39.
- the inclined portions 38, 39 meet to form an end 36 acting as a support zone.
- the junction between the first portion 32, 33 and the second inclined portion 38, 39 defines a pivot point 37 about a transverse axis 42.
- the metal strip 21 comprises between the pivot point 37 and the contact zone 23 welded to the cold pad 8, three successive folds 24, 25, 26 forming an inverted V.
- Each arm 34, 35 of the lever 30 comprises in its inclined portion 38, 39 an outer edge provided with a longitudinal fold 40, 41 of reinforcement.
- the fuse blade 20 has a stable shape to allow it to be welded to the substrate without particular holding means.
- the temperature around the hot pad 7 reaches the melting temperature of the solder (FIG. 4).
- the torque generated by the arms 34, 35 of the lever 30 tilts the contact zone 22 mainly around the pivot point 37, but this pivot point 37 can itself pivot around the three folds 24, 25, 26 of the metal strip. 21 to allow a displacement of the contact zone 22 relative to the hot pad 7 greater than three millimeters and thus cut the supply circuit of the heating resistor 4 and ensure electrical insulation.
- the heating resistor 4 is positioned on the substrate 2 so that the other welds do not melt, in particular that of the cold pad 8 which holds the fuse blade 20 in place even after fusion of the solder at the hot pad 7.
- the metal strip of the fuse blade may not include folds and be straight.
- the lever arm can be attached to the metal strip by a welding type assembly means or crimping.
- the lever can be cut in the center of the metal strip.
- the free end of the lever is located between the pivot point and the contact area welded to the cold pad.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Fuses (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0800136A FR2926394B1 (fr) | 2008-01-10 | 2008-01-10 | Dispositif de securite thermique |
| PCT/FR2009/000004 WO2009112658A2 (fr) | 2008-01-10 | 2009-01-06 | Dispositif de securite thermique |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2227818A2 true EP2227818A2 (fr) | 2010-09-15 |
| EP2227818B1 EP2227818B1 (fr) | 2014-08-20 |
Family
ID=39846598
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP09719749.5A Not-in-force EP2227818B1 (fr) | 2008-01-10 | 2009-01-06 | Dispositif de securite thermique |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20100277268A1 (fr) |
| EP (1) | EP2227818B1 (fr) |
| CN (1) | CN101911237B (fr) |
| FR (1) | FR2926394B1 (fr) |
| WO (1) | WO2009112658A2 (fr) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2919250B1 (fr) * | 2014-03-12 | 2017-06-28 | BITRON S.p.A. | Dispositif de connexion de securite et appareil comportant ledit dispositif |
| CN105869951B (zh) * | 2016-06-17 | 2018-07-03 | 佛山市格来德小家电有限公司 | 一种带熔断的防干烧水壶耦合器 |
Family Cites Families (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1891015A (en) * | 1931-05-20 | 1932-12-13 | Teesdale Mfg Company | Switch |
| US1992047A (en) * | 1933-01-03 | 1935-02-19 | Gen Plate Co | Thermostatic control |
| US2148600A (en) * | 1936-02-17 | 1939-02-28 | Marion H Rowe | Electric circuit breaker and cut-out |
| US2272459A (en) * | 1939-06-05 | 1942-02-10 | Micro Switch Corp | Thermostatic control |
| US2458804A (en) * | 1944-02-25 | 1949-01-11 | Sundt Edward Victor | Circuit protector |
| US2491032A (en) * | 1947-02-28 | 1949-12-13 | John T Collins | Circuit protector |
| US2704797A (en) * | 1952-11-28 | 1955-03-22 | Charles P Fettweis | Fire detector |
| US3213228A (en) * | 1961-09-25 | 1965-10-19 | Lyndon W Burch | Snap-acting mechanisms |
| US3613040A (en) * | 1970-02-09 | 1971-10-12 | Vapor Corp | High-voltage temperature switch |
| US3763454A (en) * | 1972-02-22 | 1973-10-02 | Tektronix Inc | Thermal switch |
| US3778739A (en) * | 1972-11-02 | 1973-12-11 | Bk Electric Co Inc | Circuit breaker |
| US3913049A (en) * | 1973-04-02 | 1975-10-14 | Bk Patent Dev | Thermostatic circuit breaker |
| US4118610A (en) * | 1974-11-16 | 1978-10-03 | Ranco Incorporated | Snap action switch blades |
| US3967227A (en) * | 1975-01-10 | 1976-06-29 | Texas Instruments Incorporated | Actuator system with ambient temperature compensation |
| DE2548141C3 (de) * | 1975-10-28 | 1978-11-30 | Draloric Electronic Gmbh, 8500 Nuernberg | Aufsteckbare elektrische Auslötsicherung |
| US4145587A (en) * | 1977-07-25 | 1979-03-20 | Ranco Incorporated | Snap action switches |
| US4250367A (en) * | 1978-07-14 | 1981-02-10 | Ranco Incorporated | Snap action switch blades |
| US4325046A (en) * | 1980-04-04 | 1982-04-13 | B/K Patent Development, Inc. | Circuit breaker |
| GB2077500A (en) * | 1980-05-13 | 1981-12-16 | Spirig Ernest | Thermal fuse |
| US4510479A (en) * | 1983-03-30 | 1985-04-09 | Airpax Corporation | PC-board mounted thermal breaker |
| DE4209542C2 (de) * | 1992-03-24 | 1995-07-06 | Roederstein Kondensatoren | Schmelzsicherung mit Federarm |
| DE4219304C2 (de) * | 1992-06-12 | 1994-03-31 | Roederstein Kondensatoren | Zuverlässiges Überstrom-Schutzbauteil mit geringem Platzbedarf und einfachem Aufbau |
| EP0654170B1 (fr) * | 1992-08-07 | 1996-02-21 | Siemens Aktiengesellschaft | Dispositif thermique de securite et procede pour l'activer |
| US5555972A (en) * | 1995-09-08 | 1996-09-17 | Schwab; Pierre P. | Self-stressing snap spring assembly for electrical contacts |
| US5790010A (en) * | 1997-02-11 | 1998-08-04 | Schwab; Pierre P. | Means for actuating a snap-acting M-blade |
| AU3617099A (en) * | 1998-04-21 | 1999-11-08 | Otter Controls Limited | Improvements relating to the control of electric heating elements |
| US5861794A (en) * | 1998-05-04 | 1999-01-19 | Texas Instruments Incorporated | Thermal circuit breaker apparatus |
| US6538553B2 (en) * | 2001-07-13 | 2003-03-25 | Tsung-Mou Yu | Switching element for electric switch |
-
2008
- 2008-01-10 FR FR0800136A patent/FR2926394B1/fr not_active Expired - Fee Related
-
2009
- 2009-01-06 EP EP09719749.5A patent/EP2227818B1/fr not_active Not-in-force
- 2009-01-06 US US12/812,328 patent/US20100277268A1/en not_active Abandoned
- 2009-01-06 WO PCT/FR2009/000004 patent/WO2009112658A2/fr not_active Ceased
- 2009-01-06 CN CN200980101817.5A patent/CN101911237B/zh not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2009112658A3 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2009112658A3 (fr) | 2009-11-05 |
| US20100277268A1 (en) | 2010-11-04 |
| WO2009112658A2 (fr) | 2009-09-17 |
| EP2227818B1 (fr) | 2014-08-20 |
| FR2926394B1 (fr) | 2010-01-22 |
| FR2926394A1 (fr) | 2009-07-17 |
| CN101911237B (zh) | 2013-03-20 |
| CN101911237A (zh) | 2010-12-08 |
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