EP0573430B1 - Element de chauffage electrique tubulaire avec un regulateur de temperature - Google Patents
Element de chauffage electrique tubulaire avec un regulateur de temperature Download PDFInfo
- Publication number
- EP0573430B1 EP0573430B1 EP91918628A EP91918628A EP0573430B1 EP 0573430 B1 EP0573430 B1 EP 0573430B1 EP 91918628 A EP91918628 A EP 91918628A EP 91918628 A EP91918628 A EP 91918628A EP 0573430 B1 EP0573430 B1 EP 0573430B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heating element
- tubular heating
- terminal
- temperature controller
- bimetal switch
- 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
- 238000010438 heat treatment Methods 0.000 title claims abstract description 39
- 239000002184 metal Substances 0.000 claims abstract description 18
- 239000011810 insulating material Substances 0.000 claims abstract description 6
- 210000002105 tongue Anatomy 0.000 claims description 15
- 230000005611 electricity Effects 0.000 claims description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
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
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0202—Switches
- H05B1/0213—Switches using bimetallic elements
-
- 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
- H05B3/48—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material
Definitions
- the present invention relates to an electric tubular heating element comprising a tubular metal casing which contains a coil of resistance wire surrounded by an insulating material, and a temperature controller connected in series with a resistance-wire coil and arranged at one end of the metal casing and comprising an insulating sleeve which contains a bimetal switch and has an outer terminal forming a terminal of the tubular heating element, and an inner terminal which later, when the temperature controller is mounted in the tubular heating element, contacts a terminal connected to the resistance-wire coil.
- the prior art encompasses electric tubular heating elements of this type.
- the temperature controller used in the prior-art tubular heating elements is of single-use type, such as a fuse, or of reclosing type, such as a bimetal switch.
- the object of the present invention is, therefore, to provide at tubular heating element with a temperature controller not impaired by the drawbacks of the prior art.
- Such a temperature controller must meet the following requirements.
- EP-A-0 204 850 discloses an electric tubular heating element having a temperature controller consisting of a bimetal switch which always returns automatically when the temperature falls to the normal value.
- This electric tubular heating element does meet only a few of the above requirements. It could be made recloseable manually by the introduction of a manually recloseable bimetal switch, such as described in e.g. DE-A-3 644 514 and DE-A-3 320 730.
- DE-B-1 125 567 discloses an electrical tubular heating element having a reclosable bimetal switch and a parallel-connected resistor element.
- an electric tubular heating element which is of the type stated in the introduction to this specification and which has the characterising features stated in claim 1.
- Preferred embodiments of the electric tubular heating element according to the invention have the features stated in claims 2-7.
- the inner and outer terminals have tongues facing one another, the bimetal switch and the resistor element being fixed one on each side of said tongues.
- rivets may be used, one of which may also constitute the fixed contact of the bimetal switch.
- the resistor element advantageously is a PTC-resistor, i.e. a resistor element whose resistance has a positive temperature coefficient.
- the temperature controller according to the invention meets the above requirements a) - f) in that
- the inventive electric tubular heating element shown in Fig. 1 consists of a tubular metal casing 1 which has a resistance-wire coil 2 extended between two terminals in the form of pins 3 and 4.
- the resistance-wire coil is surrounded by, and insulated from the casing 1 by means of, a pulverulent insulating material 5, such as magnesia powder.
- the two ends of the wire coil are in conventional manner fixed to the inner ends of the pins 3, 4, e.g. by welding.
- a temperature controller 6 is according to the invention mounted in the left end of the tubular heating element, as seen in Fig. 1.
- the temperature controller 6 has an inner terminal in the form of a contact socket 7 (Fig. 3) which encloses and electrically contacts the terminal pin 3 of the resistance-wire coil 2.
- the oppositely directed terminal 8 of the temperature controller 6 projects from the end of the tubular heating element in the form of a pin and forms the second electric terminal thereof.
- the metal casing 1 extends a certain distance along the terminal 8, i.e. it contains substantially the entire temperature controller 6, and an end bushing 9 of steatite or polymers forms a seal between the metal casing 1 and the terminal 8 and also serves to maintain the latter in place.
- the terminal 4 may be either directly connected to the resistance-wire coil 2 or connected thereto via a temperature controller corresponding to the controller 6.
- Fig. 2 illustrates an alternative tubular heating element, in which the terminals 3', 4' of the resistance-wire coil 2' are provided at the same end of the metal casing 1'. The other end of the metal casing 1' is closed, and the resistance-wire coil 2' extends from one end of the casing 1' to the other and back embedded in an insulating material 5'.
- two temperature controllers 6', 6" according to the invention are each connected to a terminal 3', 4'.
- the temperature controllers 6' and 6" in the embodiment of Fig. 2 unlike that of Fig. 1, are not substantially contained in the metal casing 1' but in an extension piece thereof which consists of a bushing 10 and a tubular member 11.
- the tubular member 11 is mounted in the bushing 10 which in turn is fixedly mounted on the metal casing 1'. Further, the bushing 10 has a threaded portion for fixing the tubular heating element.
- the outer terminals 8', 8" of the temperature controllers 6', 6" are electrically connected to two conductors in an electric cable 12 through which current is supplied to the resistance-wire coil 2'.
- the preferred embodiment of an inventive temperature controller shown in Fig. 3 comprises a sleeve 13 of an insulating material, such as plastic, preferably of a circular cross-section corresponding to e.g. the cross-section of the metal casing 1 in Fig. 1.
- the terminals 7 and 8 are mounted each in one end of the sleeve 13, the terminal 7 consisting of a cylinder 14 which is made in one piece with a contact socket 15 slotted in the longitudinal direction, and a tongue 16 facing away from the socket and disposed in a plane through a diameter of the cylinder 14.
- the terminal 8 consists of a pin which is fixedly mounted in an end wall of the sleeve 13 and has a tongue 17 extending into the free space inside the sleeve 13. The tongue 17 is located in the same plane as the tongue 16.
- a resistor element 19 is fixed to the tongue 17 by a rivet 18.
- the other end of the resistor element 19 is fixed to the tongue 16 by a rivet 20.
- One end of a bimetal spring 21 is fixed to the tongue 16 by the rivet 20 on that side of the tongue 16 which is opposite to the resistor element 19.
- the bimetal spring 21 extends in over the tongue 17 and, when in closed position, contacts the rivet 18 which thus forms the fixed contact of the bimetal switch formed by the rivet and the bimetal spring 21.
- the bimetal spring 21 is located substantially at the centre of the casing 13 and has the shape illustrated in Fig. 4.
- the resistor element 19 has the shape shown in Fig. 5.
- holes have been formed in the tongues 16 and 17 and in the resistor element 19 and one end of the bimetal spring 21, as shown in Figs 4 and 5.
- the contact socket 15 When mounting the temperature controller of Fig. 3 in e.g. the tubular heating element of Fig. 1, the contact socket 15 will contact the pin 3, and the terminal 8 will form one terminal of the tubular heating element. It should here be observed that the sleeve 13, after the details housed therein have been mounted, has been given a decreasing diameter at its free end, just beyond the contact socket 15, thereby ensuring the electric strength between the contact socket 15 and the metal casing 1.
- the resistor element 19 can be made of any suitable material of sufficiently high resistivity, but a material whose resistance has a positive temperature coefficient is preferred, since it ensures the desired limitation of the current through the tubular heating element after the bimetal switch has been tripped.
- the bimetal spring 21 will, at a given temperature, rise from the fixed contact 18, thereby breaking the normal path of the current through the resistance-wire coil 2. A slight current, depending on the resistance of the resistor element 19, will continue to flow through the resistance-wire coil 2 via the resistor element 19. Thus, this element is heated and the generation of heat is so dimensioned that the bimetal spring 21 cannot bend back and contact the fixed contact 18. To reconnect the tubular heating element, thus also the slight current through the resistor element 19 must be interrupeted.
Landscapes
- Thermally Actuated Switches (AREA)
- Resistance Heating (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
- Control Of Resistance Heating (AREA)
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
- Electromechanical Clocks (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Claims (6)
- Elément de chauffage tubulaire électrique, comportant un boítier métallique tubulaire (1 : 1') qui contient une bobine de fil de résistance (2 : 2') entourée par une matière isolante (5 : 5'), et un régulateur de température (6 : 6', 6") relié en série à la bobine de fil de résistance et disposé à une extrémité du boítier métallique et comportant un manchon isolant (13) qui contient un bilame (18, 21) et possède une borne extérieure (8) qui forme une borne de l'élément de chauffage tubulaire, et une borne intérieure (7) qui, avec le régulateur de température monté dans l'élément de chauffage tubulaire, vient en contact avec une borne (3) reliée à la bobine de fil de résistance (2),
caractérisé en ce quele bilame (18, 21) se compose d'un ressort de bilame (21) disposé le long du centre du manchon isolant (13) et ayant une extrémité reliée directement à la borne intérieure (7) et, lorsque le bilame est dans une position fermée, ayant son autre extrémité reliée à la borne extérieure (8) pour le passage du courant;en ce qu'un élément de résistance (19) est contenu dans le manchon (13), a une extrémité fixée sur la borne intérieure (7) et l'autre extrémité fixée sur la borne extérieure (8), est disposé sur le côté du ressort de bilame qui est à l'opposé de la direction d'ouverture du bilame, et présente une résistance telle que la chaleur générée par l'élément de résistance, lorsque le bilame est basculé en position ouverte et l'élément de résistance est alimenté avec du courant, est suffisante pour maintenir le bilame dans une position ouverte en chauffant le ressort de bilame; eten ce que la borne intérieure (7) possède une embase de contact (15) qui est contenue dans sa totalité dans le manchon isolant (13), qui est ainsi isolant à la fois pour l'électricité et pour la chaleur. - Elément de chauffage tubulaire électrique selon la revendication 1, caractérisé en ce que les bornes intérieure et extérieure (7, 8) possèdent des languettes (16, 17) l'une en face de l'autre, le bilame (18, 21) et l'élément de résistance (19) étant fixés de chaque côté desdites languettes.
- Elément de chauffage tubulaire électrique selon la revendication 2, caractérisé en ce que le bilame (18, 21) et l'élément de résistance (19) sont fixés au moyen de rivets (18, 20), dont l'un (18) constitue également le contact fixe du bilame.
- Elément de chauffage tubulaire électrique selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'élément de résistance (19) est une résistance PTC.
- Elément de chauffage tubulaire électrique selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le régulateur de température (6) est contenu dans sa totalité dans le boítier métallique (1).
- Elément de chauffage tubulaire électrique selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le régulateur de température (6', 6") est disposé sensiblement à l'extérieur du boítier métallique (1') dans un manchon (10, 11) qui forme une extension du boítier métallique (1').
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9003405A SE9003405D0 (sv) | 1990-10-25 | 1990-10-25 | Elektriskt roervaermeelement och temperatursaekring |
SE9003405 | 1990-10-25 | ||
PCT/SE1991/000710 WO1992008331A1 (fr) | 1990-10-25 | 1991-10-23 | Element de chauffage electrique tubulaire et regulateur de temperature pour l'element |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0573430A1 EP0573430A1 (fr) | 1993-12-15 |
EP0573430B1 true EP0573430B1 (fr) | 1998-05-20 |
Family
ID=20380736
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91918628A Expired - Lifetime EP0573430B1 (fr) | 1990-10-25 | 1991-10-23 | Element de chauffage electrique tubulaire avec un regulateur de temperature |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0573430B1 (fr) |
AT (1) | ATE166519T1 (fr) |
DE (1) | DE69129468T2 (fr) |
FI (1) | FI931851A (fr) |
SE (1) | SE9003405D0 (fr) |
WO (1) | WO1992008331A1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9124965D0 (en) * | 1991-11-25 | 1992-01-22 | Sheathed Heating Elements Ltd | Thermostatic control device |
CN116130122B (zh) * | 2023-01-18 | 2023-08-11 | 哈尔滨工程大学 | 一种用于热管冷却反应堆的功率自动控制系统 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1014676B (de) * | 1955-07-11 | 1957-08-29 | Arthur Liebrecht | Heizelement fuer elektrisch beheizte Geraete, insbesondere Waschmaschinen |
DE1125567B (de) * | 1956-06-22 | 1962-03-15 | Walter Hering Dipl Ing | Heizelement fuer elektrisch beheizte Geraete, insbesondere Waschmaschinen |
DE2513494C2 (de) * | 1975-03-26 | 1984-07-19 | Peter 7530 Pforzheim Hofsäss | Temperaturschutzschalter für Rohrheizkörper |
GB1568991A (en) * | 1976-03-26 | 1980-06-11 | Ellson & Co Ltd C | Submersible thermostatically controlled heaters |
DE3320730A1 (de) * | 1983-01-15 | 1984-07-19 | Fritz Eichenauer GmbH & Co KG, 6744 Kandel | Temperaturwaechter |
EP0204850A1 (fr) * | 1985-06-05 | 1986-12-17 | Elpag Ag Chur | Elément chauffant tubulaire |
DE3644514A1 (de) * | 1986-12-24 | 1988-07-07 | Inter Control Koehler Hermann | Bimetallschalter |
-
1990
- 1990-10-25 SE SE9003405A patent/SE9003405D0/xx unknown
-
1991
- 1991-10-23 DE DE69129468T patent/DE69129468T2/de not_active Expired - Lifetime
- 1991-10-23 WO PCT/SE1991/000710 patent/WO1992008331A1/fr active IP Right Grant
- 1991-10-23 EP EP91918628A patent/EP0573430B1/fr not_active Expired - Lifetime
- 1991-10-23 AT AT91918628T patent/ATE166519T1/de not_active IP Right Cessation
-
1993
- 1993-04-23 FI FI931851A patent/FI931851A/fi not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
ATE166519T1 (de) | 1998-06-15 |
FI931851A (fi) | 1993-06-17 |
WO1992008331A1 (fr) | 1992-05-14 |
DE69129468D1 (de) | 1998-06-25 |
FI931851A0 (fi) | 1993-04-23 |
DE69129468T2 (de) | 1998-11-26 |
SE9003405D0 (sv) | 1990-10-25 |
EP0573430A1 (fr) | 1993-12-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4101862A (en) | Current limiting element for preventing electrical overcurrent | |
US4720759A (en) | Compact protector utilizing a bimetal and an excessive rise prevention portion | |
US5936510A (en) | Sealed case hold open thermostat | |
KR100948223B1 (ko) | 열 퓨즈를 가지는 유체 가열 기기 | |
EP0039562A1 (fr) | Fusible | |
EP0233136A2 (fr) | Montage d'un élément chauffant pour chauffe-eau | |
CN104576240B (zh) | 用于断路器的脱扣装置 | |
US6020807A (en) | Sealed case hold open thermostat | |
US6577223B2 (en) | Thermal protector | |
GB1594334A (en) | Thermal protection for electric motors | |
EP0573430B1 (fr) | Element de chauffage electrique tubulaire avec un regulateur de temperature | |
US4380001A (en) | Electric safety device | |
US4255736A (en) | Thermal protective switch | |
US3418454A (en) | Electric bedcover overtemperature control system | |
ES2054079T3 (es) | Conjunto elemento calentador electrico envainado. | |
US2791660A (en) | Electrical fuse | |
JPH04345724A (ja) | 非破壊ヒューズ | |
US2524954A (en) | Thermally operated electric switch | |
JPS62165824A (ja) | サ−モスタツト | |
GB2028607A (en) | Heating circuits | |
US3962664A (en) | Current protector | |
JPH05234496A (ja) | 回路遮断制御装置 | |
EP0062082A1 (fr) | Résistance de sécurité thermosensible | |
JP2558029B2 (ja) | 抵抗器 | |
KR890005156Y1 (ko) | 전기 인두의 온도 조절장치 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19930416 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT DE ES FR IT SE |
|
17Q | First examination report despatched |
Effective date: 19950407 |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT DE ES FR IT SE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY Effective date: 19980520 |
|
REF | Corresponds to: |
Ref document number: 166519 Country of ref document: AT Date of ref document: 19980615 Kind code of ref document: T |
|
ITF | It: translation for a ep patent filed | ||
REF | Corresponds to: |
Ref document number: 69129468 Country of ref document: DE Date of ref document: 19980625 |
|
ET | Fr: translation filed | ||
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: AT Payment date: 20101006 Year of fee payment: 20 Ref country code: FR Payment date: 20101027 Year of fee payment: 20 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20101005 Year of fee payment: 20 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20101028 Year of fee payment: 20 Ref country code: SE Payment date: 20101018 Year of fee payment: 20 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R071 Ref document number: 69129468 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R071 Ref document number: 69129468 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: SE Ref legal event code: EUG |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: MK07 Ref document number: 166519 Country of ref document: AT Kind code of ref document: T Effective date: 20111023 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION Effective date: 20111024 |