EP0660644A2 - Elément chauffant tubulaire avec protection de surcharge et détecteur de température - Google Patents

Elément chauffant tubulaire avec protection de surcharge et détecteur de température Download PDF

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Publication number
EP0660644A2
EP0660644A2 EP94120412A EP94120412A EP0660644A2 EP 0660644 A2 EP0660644 A2 EP 0660644A2 EP 94120412 A EP94120412 A EP 94120412A EP 94120412 A EP94120412 A EP 94120412A EP 0660644 A2 EP0660644 A2 EP 0660644A2
Authority
EP
European Patent Office
Prior art keywords
temperature sensor
heating element
tubular heating
element according
temperature
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
Application number
EP94120412A
Other languages
German (de)
English (en)
Other versions
EP0660644A3 (fr
EP0660644B1 (fr
Inventor
Ingo Dr. Bleckmann
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.)
BLECKMANN GMBH
Original Assignee
ELPAG AG CHUR
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 ELPAG AG CHUR filed Critical ELPAG AG CHUR
Publication of EP0660644A2 publication Critical patent/EP0660644A2/fr
Publication of EP0660644A3 publication Critical patent/EP0660644A3/fr
Application granted granted Critical
Publication of EP0660644B1 publication Critical patent/EP0660644B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H05B1/0227—Applications
    • H05B1/0288—Applications for non specified applications
    • H05B1/0291—Tubular 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 invention relates to a tubular heater according to the preamble of claim 1.
  • EP 0 085 465 A1 shows a tubular heater of the type mentioned above.
  • This tubular heater can be used for a wide variety of purposes. If it is used, for example, to directly heat or heat a medium in a container, it is necessary to provide an opening in the container wall through which the tubular heating element can be inserted into the container. This opening is closed by means of a flange plate, the ends of the tubular heater, which is usually bent in a U-shape, being passed through the flange plate.
  • the first variant has the disadvantage that this creates a further potential leak.
  • a further opening does not have to be provided in the container wall, but the opening for the tubular heater must be enlarged in accordance with the then larger flange plate, which on the one hand means a further weakening of the container wall and on the other poses sealing problems.
  • a device for attaching a heating device formed by a tubular heating element in an opening of a container wall in which the flange plate is fixed to the container wall by means of a clamping device.
  • the tensioning device consists of one lying against the inside of the container wall Clamping plate, which is firmly connected to a clamping bolt passing through the flange plate.
  • the clamping plate is pressed against the inside of the container wall by means of a nut, possibly with the interposition of a sealing element.
  • the clamping bolt is hollow and serves to receive a temperature sensor for the medium to be heated.
  • DE 40 14 753 A1 also shows a tubular heater in which the connecting bolt is surrounded by an annular overheating protection which has both contact with the connecting bolt and with the casing tube.
  • This overheating protection is connected to a relay circuit provided outside the tubular heater, which switches off one or both voltage poles when the tubular heater overheats.
  • a device for monitoring the medium to be heated is not provided here.
  • DE 28 44 763 A1 shows a water heater for an aquarium, in which a temperature sensor part in the form of a thermistor is arranged on the inner wall of the glass housing of the water heater.
  • the line elements for the electrical supply of the heating coil are passed through the thermistor.
  • the termistor is not only in direct contact with the inner wall of the glass housing but also with the electrical connecting elements of the heating coil and can thus be directly influenced by the temperature of the heating coil via coupling effects.
  • the temperature sensor is connected via a connecting line to a control device which controls the tubular heating element in such a way that the desired temperature for the medium to be heated is maintained.
  • the temperature sensor can also be used as protection for the tubular heating element. This can be done, for example, by providing a limit temperature that is lower than the melting temperature of the tubular heating element when the operating temperature of the medium that is actually to be monitored is exceeded, and that when this temperature limit is detected by the temperature sensor, the current supply to the tubular heating element or the heating coil by means of a Control device or a switching device is interrupted.
  • the temperature sensor can also be used as a second safeguard for the tubular heater.
  • a switching or control device connected to the temperature sensor can be programmed or designed so that when a temperature above the operating temperature for the medium to be heated but below the melting temperature of the tubular heater, the power supply for the tubular heater is switched off. It is therefore possible to double-protect the tubular heater.
  • a material layer can also be provided between the temperature sensor and the connection element, the temperature conductivity of which changes as a function of the temperature or the ambient temperature.
  • the material layer can be designed such that when a limit temperature is exceeded, it has a higher temperature conductivity than at a temperature below the limit temperature. In this way it can be achieved that the temperature sensor can be used as a safeguard for the tubular heating element in addition to its function of monitoring the temperature of the medium to be heated and also as a safeguard against burning of the tubular heating element. If a separate overload safety device is provided to protect the tubular heater from burning out, the temperature sensor can continue to serve as a further safeguard in the event of the overload protection of the tubular heater failing.
  • the temperature sensor is not only acted upon by the temperature of the medium to be heated (but possibly only air), but by the changed temperature Thermal conductivity of the material layer also due to the temperature prevailing inside the tubular heater. He can then switch off the tubular heater by means of an appropriate circuit.
  • the temperature sensor can also be advantageous for the temperature sensor to be arranged in the axial direction in front of the connection element, which may consist of an overload protection device and a connection bolt. This ensures that particularly sensitive temperature sensors are not influenced by the heat radiated by the heating coil.
  • the temperature sensor again viewed in the axial direction, is arranged after the connection elements.
  • the temperature sensor can also be used to switch off the heating coil if a limit temperature is exceeded and if the additionally provided overload protection fails.
  • temperature sensors can also be used which have a relatively coarse sensitivity. Depending on the design and response behavior of the temperature sensor, this can also be done with an arrangement in the axial direction in front of the connection elements.
  • the temperature sensor is not influenced by the temperature generated by the heating coil.
  • the jacket tube is constructed in several parts in such a way that the tube sections for the connection ends are inserted into the tube section receiving the heating coil with the interposition of thermal insulation.
  • this is also only possible at the end of the tubular heater, which is provided for receiving the temperature sensor. It is also possible to select or dimension the temperature sensor so that when the heating coil reaches the operating temperature, the temperature sensor is able to monitor the temperature of the medium to be heated.
  • the temperature sensor should be arranged in the vicinity of the inner wall of the casing tube in such a way that it can detect the temperature of the medium to be monitored without difficulty. It can be provided here, for example, that the temperature sensor rests on the inner wall of the casing tube or in close proximity to it.
  • the temperature sensor arranged in the vicinity of the inner wall of the jacket tube in the unheated section of the tubular heater can take a wide variety of forms. So there is the possibility that it is only point-shaped, so that it is arranged, for example, based on a medium level, at the upper end region of this level with tubular heating elements just covered by the medium. Likewise, in order to enable temperature monitoring even at a lower fill level of the medium to be heated, it can be designed in a ring shape in such a way that it lies along the preferably circular cross section of the casing tube on its inner wall or is arranged in the immediate vicinity thereof. Furthermore, there is the possibility that it rests along an imaginary ring in ring sections on the inner wall of the casing tube or is arranged in the immediate vicinity thereof. There is also the possibility that several temperature sensors are provided in an annular arrangement, all of which act on a control device.
  • the temperature sensor can be formed by a wide variety of elements. So there is the possibility that it is formed, for example, by an NTC, PTC or bimetal element. There is also the possibility that it is designed as a resistance wire. Likewise, the temperature sensor can be an element with a negative or positive temperature gradient. Furthermore, the temperature sensor can be designed as an element which allows the temperature to be measured by changing its resistance value.
  • a thermally and / or electrically insulating layer is provided between the Temperature sensor and the other components of the tubular heater.
  • the choice of the material of this insulating layer can be selected depending on the operating temperature to be achieved by the tubular heater and / or the electrical values. If this operating temperature is only slightly above the temperature to be monitored, depending on the distance of the temperature sensor from the connecting element or the internal components of the tubular heating element, air can be an adequate insulator.
  • a magnesium oxide powder is used as an insulating element.
  • the insulating bead already provided in the known tubular heating element which seals off the end of the tubular heating element from the environment, or other shaped bodies, can be used as the insulating element.
  • a liquid insulating body is also conceivable. The aim is to shield the temperature sensor from all primary and secondary heat sources with the exception of the medium to be monitored and / or live parts.
  • the temperature sensor can be inserted into the unheated end of the tubular heating element to such an extent that it is not influenced by the temperature radiated by the heating coil, on the one hand, but is able, on the other hand, to reliably monitor the temperature of the medium to be monitored and reliably record.
  • the tubular heaters are manufactured in large numbers.
  • the same jacket pipe, the same heating coil and the same connection elements can be used for different tubular heaters regardless of their operating temperature Find.
  • Tubular heating elements with different operating temperatures can differ due to the overload protection and / or the temperature sensor.
  • the overload protection device and / or the temperature sensor can be designed to be insertable from the outside into the end of the tubular heating element.
  • the overload protection and / or the temperature sensor are determined by appropriate measures on the tubular heater end, so that they can no longer be pulled out.
  • the temperature sensor is connected to a control device which controls the power supply to the heating coil.
  • the primary task of the temperature sensor is to maintain the desired temperature for the medium to be heated.
  • the control device is designed in two stages, that is, it controls the power supply to the heating coil accordingly until the operating temperature is reached, and if the operating temperature is exceeded and a predetermined temperature is reached before the tubular heating element melts, the power supply to the heating coil completely prevented. This ensures that in the event of a failure of the overload protection device or a technical defect in which the heating coil continues to be supplied with power despite the overload protection device responding, or if the overload protection device is not present, the tubular heating element is switched off safely.
  • the tubular heater can take any shape. So there is the possibility that it can be elongated, C-shaped or U-shaped. Depending on the design of the tubular heater and / or the place of use or the medium to be monitored, one or more temperature sensors can be provided in the unheated tube ends of the tubular heater in the manner described above.
  • FIG. 1 one end of a tubular heater 10 according to the invention is shown.
  • the other end of the tubular heater 10, which is not shown, can also be constructed.
  • the tubular heating element 10 is substantially elongated or else has a U, C or hairpin shape.
  • an electrical resistance heating coil 14 is embedded in insulating material 16, such as, for example, a compacted magnesium oxide powder, in a jacket tube 12 of the tubular heater 10, which is preferably made of metal, in particular aluminum.
  • the heating coil 14 is fastened to a connecting bolt 18 which has an elongated conical end 18a which adjoins a substantially cylindrical head 18b.
  • the heating coil 14 is attached to the conical end 18a of the connecting bolt 18 after the heating coil has been pushed on 14 at a point 20, for example by welding.
  • a contactless welding technique such as, for example, laser beam welding technique, can preferably be used here.
  • the connecting tube 22 is held concentrically in the casing tube 12 by a sleeve-shaped, stepped insulating bead 24, the front end of the connecting tube 22 projecting beyond the free front end of the insulating bead 24.
  • An essentially cylindrical overload safety device 26 for example a fuse, is inserted into the connecting tube 22 and is fastened to a connecting wire piece 28.
  • An insulating tube 30 is pushed over the connecting wire piece 28. If necessary, the tubular heater 10 can also do without overload protection 26.
  • the insulating bead 24 has, at its upper end, with reference to FIGS. 1 and 2, a groove 24a which serves to receive a temperature sensor 32.
  • the groove 24a extends from the outside into the interior of the casing tube 12, but the groove 24a does not extend completely to the end of the insulating bead 24.
  • the temperature sensor 32 inserted into the groove 24a can be an NTC element, for example.
  • the temperature sensor 32 is designed as a punctiform element. As is apparent in particular from FIG. 1, it lies against the inside 12a of the tubular casing 12.
  • the fuse 26 can be replaced or not exchangeable and the temperature sensor 32 can be designed to be exchangeable or non-exchangeable and can be inserted from the outside. If, after the temperature sensor 32 has been installed, it should not be interchangeable, the groove 24a can be provided with a plug 34, for example made of resin, as shown in dash-dot lines in FIG.
  • the temperature sensor 32 is connected via a line element 36 to a control device (not shown further), which controls the current supply from the current source to the heating coil 14 as a function of the temperature determined by the temperature sensor 32.
  • the temperature sensor 32 is arranged outside the area of the heating coil 14, that is to say in the cold end of the tubular heating element 10. This prevents the temperature sensor 32 from being influenced by the temperature or heat radiated by the heating coil 14.
  • the temperature sensor is inserted into the unheated end of the tubular heating element 10 up to approximately the middle of the overload protection device 26.
  • the temperature sensor 32 can also be inserted into the tubular heating element end up to the heating coil 14 if it is ensured that there is sufficient insulation between the heating coil 14 and the temperature sensor 32. In the present case, this insulation is formed by the material of the insulating bead

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  • Resistance Heating (AREA)
  • Control Of Resistance Heating (AREA)
  • Pipe Accessories (AREA)
EP94120412A 1993-12-23 1994-12-22 Elément chauffant tubulaire avec protection de surcharge et détecteur de température Expired - Lifetime EP0660644B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4344341 1993-12-23
DE4344341A DE4344341A1 (de) 1993-12-23 1993-12-23 Rohrheizkörper mit Überlastsicherung und Temperaturfühler

Publications (3)

Publication Number Publication Date
EP0660644A2 true EP0660644A2 (fr) 1995-06-28
EP0660644A3 EP0660644A3 (fr) 1995-12-20
EP0660644B1 EP0660644B1 (fr) 2002-04-24

Family

ID=6506114

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94120412A Expired - Lifetime EP0660644B1 (fr) 1993-12-23 1994-12-22 Elément chauffant tubulaire avec protection de surcharge et détecteur de température

Country Status (3)

Country Link
EP (1) EP0660644B1 (fr)
DE (2) DE4344341A1 (fr)
ES (1) ES2174861T3 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000066959A1 (fr) * 1999-04-28 2000-11-09 I.R.C.A. S.P.A. - Industria Resistenze Corazzate E Affini Element a resistance pour le degivrage d'evaporateurs dans des unites de refrigeration
EP1081986A2 (fr) * 1999-09-02 2001-03-07 Bleckmann GmbH Elément chauffant tubulaire possédant une protection NTC/PTC
EP1251718A3 (fr) * 2001-04-18 2006-09-20 Martin Hess Chauffage électrique protégé des explosions, en particulier destiné au chauffage d'un espace intérieur d'un placard de protection contenant des instruments
WO2007041188A1 (fr) * 2005-09-29 2007-04-12 Rosemount Inc. Régulation de la température d'un dispositif de terrain associé à un procédé
US7347099B2 (en) 2004-07-16 2008-03-25 Rosemount Inc. Pressure transducer with external heater
US10873992B2 (en) 2017-02-15 2020-12-22 Tuerk & Hillinger Gmbh Heating cartridge with temperature sensor

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19937492C2 (de) 1999-08-07 2001-08-23 Mfh Hyperthermiesysteme Gmbh Magnetfeldapplikator zur Aufheizung von magnetischen oder magnetisierbaren Substanzen oder Festkörpern in biologischem Gewebe
ES1058126Y (es) * 2004-07-20 2005-02-16 Termoelectrica Vila S A Dispositivo de climatizacion para vehiculos y similares

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4358667A (en) * 1977-12-16 1982-11-09 International Telephone And Telegraph Corporation Cartridge-type electric immersion heating element having an integrally contained thermostat
EP0133906A1 (fr) * 1983-06-30 1985-03-13 Patzner GmbH + Co. Corps de chauffe pour une cuve de cuisson
EP0543655A1 (fr) * 1991-11-21 1993-05-26 Lawrence Plc Elément chauffant immersible

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4124793A (en) * 1978-01-13 1978-11-07 Metaframe Corporation Aquarium water heater
DE4014753A1 (de) * 1990-05-08 1991-11-14 Elpag Ag Chur Rohrheizkoerper mit sicherung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4358667A (en) * 1977-12-16 1982-11-09 International Telephone And Telegraph Corporation Cartridge-type electric immersion heating element having an integrally contained thermostat
EP0133906A1 (fr) * 1983-06-30 1985-03-13 Patzner GmbH + Co. Corps de chauffe pour une cuve de cuisson
EP0543655A1 (fr) * 1991-11-21 1993-05-26 Lawrence Plc Elément chauffant immersible

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000066959A1 (fr) * 1999-04-28 2000-11-09 I.R.C.A. S.P.A. - Industria Resistenze Corazzate E Affini Element a resistance pour le degivrage d'evaporateurs dans des unites de refrigeration
EP1081986A2 (fr) * 1999-09-02 2001-03-07 Bleckmann GmbH Elément chauffant tubulaire possédant une protection NTC/PTC
EP1081986A3 (fr) * 1999-09-02 2002-05-29 Bleckmann GmbH Elément chauffant tubulaire possédant une protection NTC/PTC
EP1251718A3 (fr) * 2001-04-18 2006-09-20 Martin Hess Chauffage électrique protégé des explosions, en particulier destiné au chauffage d'un espace intérieur d'un placard de protection contenant des instruments
US7347099B2 (en) 2004-07-16 2008-03-25 Rosemount Inc. Pressure transducer with external heater
WO2007041188A1 (fr) * 2005-09-29 2007-04-12 Rosemount Inc. Régulation de la température d'un dispositif de terrain associé à un procédé
US7679033B2 (en) 2005-09-29 2010-03-16 Rosemount Inc. Process field device temperature control
US10873992B2 (en) 2017-02-15 2020-12-22 Tuerk & Hillinger Gmbh Heating cartridge with temperature sensor

Also Published As

Publication number Publication date
DE59410109D1 (de) 2002-05-29
ES2174861T3 (es) 2002-11-16
EP0660644A3 (fr) 1995-12-20
DE4344341A1 (de) 1995-07-06
EP0660644B1 (fr) 2002-04-24

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