EP1251718B1 - Chauffage électrique protégé des explosions, en particulier destiné au chauffage d'un espace intérieur d'un placard de protection contenant des instruments - Google Patents

Chauffage électrique protégé des explosions, en particulier destiné au chauffage d'un espace intérieur d'un placard de protection contenant des instruments Download PDF

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Publication number
EP1251718B1
EP1251718B1 EP02003944A EP02003944A EP1251718B1 EP 1251718 B1 EP1251718 B1 EP 1251718B1 EP 02003944 A EP02003944 A EP 02003944A EP 02003944 A EP02003944 A EP 02003944A EP 1251718 B1 EP1251718 B1 EP 1251718B1
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EP
European Patent Office
Prior art keywords
temperature
fuse
heating
explosion
changeover
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
EP02003944A
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German (de)
English (en)
Other versions
EP1251718A3 (fr
EP1251718A2 (fr
Inventor
Martin Hess
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Individual
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Individual
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Publication of EP1251718A2 publication Critical patent/EP1251718A2/fr
Publication of EP1251718A3 publication Critical patent/EP1251718A3/fr
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Publication of EP1251718B1 publication Critical patent/EP1251718B1/fr
Anticipated expiration legal-status Critical
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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
    • H05B1/0205—Switches using a fusible material

Definitions

  • the invention relates to an electric, explosion-proof heating, in particular for heating the interior of an instrument protective cabinet according to the preamble of claim 1.
  • such an explosion-proof heater requires that it requires little space with good effectiveness, that it can be adapted to different conditions, that a set temperature be controlled as precisely as possible, and that protection regulations with regard to contact protection and explosion protection be maintained.
  • a known, generic heating ( DE 38 14 145 C2 ) comprises a radiator having a receiving opening, a heating element and an over-temperature fuse connected thereto in series with a specific response temperature, wherein the heating element is inserted into the receiving opening and encapsulated.
  • the heating element and the series-connected overtemperature protection are connected via electrical connection cables to a temperature controller to which an ambient temperature sensor is also connected as an actual value transmitter.
  • Such heaters are the specific conditions of use to be adapted and dimensioned so that in a temperature-controlled operation by the explosion protection specified limit temperatures are not exceeded.
  • unfavorable conditions and a combination of unfavorable boundary conditions In unfavorable conditions and a combination of unfavorable boundary conditions, however, excessive overheating of the heater can not be ruled out, especially in the event of overshoot of the temperature control without additional measures.
  • the above-mentioned overtemperature safeguards interrupt the electrical heating circuit in such a case. So far, reversible switching elements are used as overtemperature fuses, which are resettable after a response in their backup function. There are also known by hand exchangeable fuses.
  • the object of the invention is to propose measures with which such a complete replacement for the heating is usually avoidable.
  • a fuse temperature sensor is arranged in the region of the fuse and cast with in the receiving opening.
  • the fuse temperature sensor is connected with connecting cables to the temperature controller.
  • This fuse temperature sensor can be used to determine the current temperature of the fuse for comparison with a changeover temperature set in the temperature controller. This switching temperature is selected so that it lies within a sufficient safety temperature distance below the response temperature of the fuse.
  • the temperature controller is designed so that it works in a temperature range below the predetermined and can be determined with the fuse temperature sensor switching temperature in a conventional manner in a first control algorithm, including the ambient temperature sensor as an actual value. A reaching and / or exceeding this predetermined switching temperature is detected by the temperature controller by evaluating the sensor values of the fuse temperature sensor, whereupon the temperature controller switches to another second control algorithm and de-regulates the heating power of the heating element to protect the fuse. After a subsequent undershooting of the switching temperature, optionally with a predeterminable in the control algorithm underflow distance, then the temperature controller switches back to the first control algorithm.
  • the switching temperature is to be chosen so that even with unfavorable conditions, for example in a possible overshoot of the temperature control according to the first control algorithm at an initial heating phase with not yet steady temperature, the response temperature of the fuse due to the reduction of the heating power of the heating element is certainly not reached ,
  • the arrangement according to the invention can preferably be installed in a radiator known per se, which is designed as an elongate body with an axial receiving space and radially projecting heating fins.
  • such a radiator according to claim 3 is preferably made of metal.
  • the radiator is preferably made of metal.
  • the radiator is known to produce the radiator as a whole casting or as in the DE 38 14 145 C2 described to manufacture the lamellae separately and to attach to a base body.
  • According to claim 4 can be used as a fuse temperature sensor, a cost NTC resistor.
  • the switching temperature in the control circuit.
  • a better adaptation to different conditions is possible according to claim 5, when the switching temperature is adjustable on the temperature controller. Even with such an adjustable switching temperature, the overall safety function of the cast fuse is not affected.
  • control algorithms can be fixed. According to claim 6, it may be appropriate for further adjustments to make the control algorithm for the temperature range below the switching temperature and / or the control algorithm for the range above the switching temperature adjustable.
  • the single figure shows schematically an electric, explosion-proof heating, z.
  • This heater comprises a radiator 2 with a receiving opening 3, wherein the radiator 2 is formed as an elongated body with an axial receiving space as a receiving space opening and with radially projecting heating fins 4.
  • the radiator 2 may be cast, for example, of metal.
  • the electrical, explosion-proof heater 1 further comprises a heating element 5 and a series-connected fuse as overtemperature fuse 6 with a specific response temperature.
  • the heating element 5 and the excess temperature fuse 6 are inserted into the receiving opening 3 and potted there by means of a potting compound 7.
  • the single figure can also be further seen that the heating element 5 is connected to the serially connected over-temperature fuse 6 via electrical connection lines 8, 14 with a temperature controller 9, to which an ambient temperature sensor 10 is connected as an actual value.
  • a fuse temperature sensor 11 formed by an NTC resistor is furthermore arranged and molded into the receiving opening 3, which is likewise connected to the temperature regulator 9 with connection lines 12, 13.
  • the current temperature of the excess temperature fuse 6 can be determined for a comparison with a predetermined switching temperature, the switching temperature is set with a safety temperature interval below the response temperature of the excess temperature fuse 6.
  • the temperature controller 9 operates in a temperature range below the predetermined and ascertainable with the fuse temperature sensor 11 switching temperature in a conventional manner in a control loop involving the ambient temperature sensor 10 as the actual value, the temperature controller 9 upon reaching and / or exceeding the switching temperature, taking into account Sensor values of the fuse temperature sensor 11 switches to another control algorithm and de-regulates the heating power of the heating element 5 to protect the excess temperature fuse 6.
  • the switching temperature at the temperature controller 9 is adjustable.
  • the control algorithm for the temperature range below the switching temperature and / or the control algorithm for a range above the switching temperature on the temperature controller 9 are separately adjustable.

Landscapes

  • Control Of Resistance Heating (AREA)
  • Control Of Temperature (AREA)

Claims (6)

  1. Chauffage électrique protégé des explosions, en particulier destiné au chauffage d'un espace intérieur d'un placard de protection contenant des instruments, avec un radiateur avec une ouverture de logement,
    avec un élément chauffant et un fusible monté en ligne comme fusible d'élévation de température avec une certaine température de réponse,
    l'élément chauffant et le fusible d'élévation de température étant insérés dans l'ouverture de logement et y étant scellés, et
    l'élément chauffant étant relié avec le fusible monté en ligne par l'intermédiaire de circuits électriques de connexion à un régulateur de température, auquel est en outre raccordé un capteur de température ambiante comme indicateur de valeur réelle,
    caractérisé en ce que,
    un capteur de température-fusible (11) est disposé dans la zone du fusible (6) et est scellé avec lui dans l'ouverture de logement (3), capteur qui est relié avec des circuits de connexion (12, 13) au régulateur de température de façon à ce qu'avec le capteur de température-fusible (11), la température actuelle du fusible (6) peut être détectée pour une comparaison avec une température de commutation et la température de commutation est déterminée avec un écart de température de sécurité en dessous de la température de réponse du fusible (6), et
    en ce que le régulateur de température (9) fonctionne dans une plage de température en dessous de la température de commutation prescrite et pouvant être déterminée avec le capteur de température-fusible (11) de manière traditionnelle dans un circuit de régulation incluant le capteur de température ambiante (10) comme indicateur de valeur réelle et le régulateur de température (9), lorsque la température de commutation est atteinte et/ou dépassée en tenant compte des valeurs de capteur du capteur de température-fusible (11), commute dans un autre algorithme de régulation et règle la puissance de chauffage de l'élément chauffant (5) pour protéger le fusible (6).
  2. Chauffage électrique protégé des explosions selon la revendication 1, caractérisé en ce que le radiateur (2) est un corps étiré en longueur avec un espace de logement axial (3) et des lamelles chauffantes maintenues à distance radiale (4).
  3. Chauffage électrique protégé des explosions selon la revendication 1 ou 2, caractérisé en ce que le radiateur (2) est scellé dans du métal.
  4. Chauffage électrique protégé des explosions selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le capteur de température-fusible (11) est une résistance NTC.
  5. Chauffage électrique protégé des explosions selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la température de commutation peut être réglée sur le régulateur de température (9).
  6. Chauffage électrique protégé des explosions selon l'une quelconque des revendications 1 à 5, caractérisé en ce que l'algorithme de régulation pour la plage de température en dessous de la température de commutation et/ou l'algorithme de régulation pour la plage au-dessus de la température de commutation peuvent être réglés séparément sur le régulateur de température (9).
EP02003944A 2001-04-18 2002-02-22 Chauffage électrique protégé des explosions, en particulier destiné au chauffage d'un espace intérieur d'un placard de protection contenant des instruments Expired - Lifetime EP1251718B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10118922 2001-04-18
DE10118922A DE10118922C1 (de) 2001-04-18 2001-04-18 Verfahren zur Sicherung und Regelung einer elektrischen, explosionsgeschützten Heizung und Vorrichtung zur Durchführung des Verfahrens

Publications (3)

Publication Number Publication Date
EP1251718A2 EP1251718A2 (fr) 2002-10-23
EP1251718A3 EP1251718A3 (fr) 2006-09-20
EP1251718B1 true EP1251718B1 (fr) 2008-04-02

Family

ID=7681800

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02003944A Expired - Lifetime EP1251718B1 (fr) 2001-04-18 2002-02-22 Chauffage électrique protégé des explosions, en particulier destiné au chauffage d'un espace intérieur d'un placard de protection contenant des instruments

Country Status (3)

Country Link
US (1) US6720535B2 (fr)
EP (1) EP1251718B1 (fr)
DE (2) DE10118922C1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022102836A1 (de) 2022-02-08 2023-08-10 Turck Holding Gmbh Vorrichtung und Verfahren zur Überwachung eines Sensors

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104994603A (zh) * 2015-07-16 2015-10-21 广东志高空调有限公司 一种电加热保护系统
CN111600222B (zh) * 2020-06-16 2022-03-29 河南里程碑科技有限公司 高效散热型配电自动化监控终端
CN115628322B (zh) * 2022-10-26 2023-05-16 南京市锅炉压力容器检验研究院 一种易熔合金塞的智能控制方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4075678A (en) * 1976-02-13 1978-02-21 American Thermostat Corporation Fail safe circuit for heat generating device
DE3633682A1 (de) * 1986-10-03 1988-04-14 Hess Joachim Heizblock zur beheizung von ventilbloecken und messgeraeten
DE3814145C2 (de) * 1988-04-27 1998-07-23 Hess Joachim Vorrichtung zum Zuführen oder Abführen von Wärme
DE4344341A1 (de) * 1993-12-23 1995-07-06 Elpag Ag Chur Rohrheizkörper mit Überlastsicherung und Temperaturfühler
JPH0851722A (ja) * 1994-08-08 1996-02-20 Canon Inc ヒータの通電制御装置
JPH1062268A (ja) * 1996-08-26 1998-03-06 Yutaka Denshi Kk 観賞魚用温水ヒーター
JP2000010435A (ja) * 1998-06-17 2000-01-14 Canon Inc 加熱装置、加熱定着装置及び画像形成装置
DE19941901A1 (de) 1999-09-02 2001-03-29 Bleckmann Gmbh Lamprechtshause Rohrheizkörper mit NTC/PTC-Absicherung
DE19941961B4 (de) * 1999-09-03 2008-10-23 Volkswagen Ag Navigationssystem

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022102836A1 (de) 2022-02-08 2023-08-10 Turck Holding Gmbh Vorrichtung und Verfahren zur Überwachung eines Sensors
WO2023151878A1 (fr) 2022-02-08 2023-08-17 Turck Holding Gmbh Dispositif et procédé de surveillance de capteur

Also Published As

Publication number Publication date
US20020158062A1 (en) 2002-10-31
DE50211999D1 (de) 2008-05-15
EP1251718A3 (fr) 2006-09-20
DE10118922C1 (de) 2003-04-30
EP1251718A2 (fr) 2002-10-23
US6720535B2 (en) 2004-04-13

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