EP0660644B1 - 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
EP0660644B1
EP0660644B1 EP94120412A EP94120412A EP0660644B1 EP 0660644 B1 EP0660644 B1 EP 0660644B1 EP 94120412 A EP94120412 A EP 94120412A EP 94120412 A EP94120412 A EP 94120412A EP 0660644 B1 EP0660644 B1 EP 0660644B1
Authority
EP
European Patent Office
Prior art keywords
temperature sensor
tubular heater
tubular
heater
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.)
Expired - Lifetime
Application number
EP94120412A
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German (de)
English (en)
Other versions
EP0660644A3 (fr
EP0660644A2 (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
Bleckmann GmbH
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 Bleckmann GmbH filed Critical Bleckmann GmbH
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.
  • a tubular heater goes type mentioned above, in which the temperature sensor in a chamber is arranged, which is optionally a thermal barrier insulating material is separated from the heating coil.
  • the temperature sensor is arranged near the inner wall of the casing tube.
  • the connection the heating coil is made via two feed wires that pass through the barrier, as well a printed circuit board located in the chamber, which also receives the temperature sensing element.
  • a tubular heater can be found in EP 0 085 465 A1 for the can be used for a wide variety of purposes. He will used, for example, in a container It is to heat or heat the medium directly it is necessary to provide an opening in the container wall, through which the tubular heater is inserted into the container can be. This opening is made using a flange plate closed, the ends of the mostly U-shaped curved Tubular heater passed through the flange plate become. In addition to the temperature of the tubular heater itself the temperature of the medium to be heated is also monitored; so there is a need either in the container wall or another opening in the flange plate for passing a temperature sensor through the container wall or flange plate.
  • the first variant has the disadvantage, in addition to the additional processing steps, that this creates another potential leak is produced.
  • another Breakthrough is not provided in the container wall , however, the opening for the tubular heater must be made accordingly the larger flange plate then enlarged, which means further weakening of the container wall and on the other hand it poses sealing problems.
  • EP 0 051 914 A1 also describes a device for Attachment of a heating device formed by a tubular heater known in an opening of a container wall, at which the flange plate by means of a clamping device on the Container wall is set.
  • the tensioning device exists from one lying against the inside of the container wall Clamping plate, which with a penetrating the flange plate Clamping bolt is firmly connected. With the help of a mother Clamping plate against the inside of the tank wall, if necessary Intermediation of a sealing element pressed.
  • the clamping bolt is hollow and is used to hold a temperature sensor for the heating medium. This cheap solution in terms of the size of the flange plate and the number of necessary Breakthroughs are relatively complex and expensive in production.
  • a tubular heater continues out, in which the connecting bolt of an annular Overheating protection is surrounded, which is both contact with the Has connecting bolts as well as with the casing tube.
  • This Overheating protection is provided with an outside of the tubular heater provided relay circuit connected when overheating the tubular heater switches off one or both voltage poles.
  • a device for monitoring the to be heated Medium is not provided here.
  • DE 28 44 763 A1 describes a water heater for an aquarium in which a temperature sensor part in Form of a thermistor on the inner wall of the glass housing Water heater is arranged. Be through the thermistor the line elements for the electrical supply of the Passed heating coil. So the termistor is not there 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 have coupling effects from the temperature the heating coil can be influenced directly.
  • 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 as a function of those to be achieved by the tubular heater Operating temperature and / or the electrical values selected become. 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 inner Components of the tubular heating element air an adequate insulator his.
  • the temperature sensor is connected to a Control device connected to the tubular heater in the Way controls that the desired temperature for the to be heated Medium is observed. It still exists here the possibility that the temperature sensor also serves as a safeguard is used for the tubular heater. This can happen, for example, by actually exceeding the operating temperature of the medium to be monitored Limit temperature is provided, which is less than that Melting temperature of the tubular heater, and that upon detection this limit temperature by the temperature sensor Power supply to the tubular heater or the heating coil by means of a control device or a switching device interrupted becomes. Furthermore, the temperature sensor can also be used as second protection for the tubular heater can be used. For example, if a e.g.
  • overload protection which burns out the tubular heater prevented in the event of a dry fall, for example should fail, or addressed this overload protection has, but due to a technical defect Heating coil remains connected to the power source, so can a switching or connected to the temperature sensor Control device can be programmed or designed so that when reaching over the operating temperature for that too heating medium but below the melting temperature of the Tubular radiator lying temperature, the power supply for the tubular heater is switched off. So there is the possibility double protect the tubular heater.
  • the temperature sensor and the connection element also a material layer be provided, the thermal conductivity depending on the temperature or the ambient temperature changes.
  • the material layer can be formed in this way be that when a limit temperature is exceeded has a higher thermal conductivity than one Temperature below the limit temperature. This can achieved that the temperature sensor as protection for the tubular heater in addition to its monitoring function the temperature of the medium to be heated also for protection against burning the tubular heater can. Is to protect the tubular heater from burning A separate overload protection is provided, so it can continue the temperature sensor if the overload protection fails of the tubular heater serve as further protection.
  • the temperature sensor is not only the temperature of the medium to be heated (but possibly only Air), but due to the changed temperature conductivity the material layer also through the inside the temperature of the tubular heater. By an appropriate Circuit, he can then switch off the tubular heater.
  • the temperature sensor in the axial direction in front of the connection element consisting of if necessary an overload protection device and a connecting bolt is. This ensures that particularly sensitive Temperature sensor from that emitted by the heating coil Heat can not be affected.
  • the temperature sensor again looks in the axial direction is arranged after the connection elements. hereby the temperature sensor can also be used to switch off the Heating coil when a limit temperature is exceeded and at Failure of the additional overload protection provided become. In such a case, temperature sensors can also be used be used which is proportionate have rough responsiveness. Depending on the training and response behavior of the temperature sensor can even with an arrangement in the axial direction in front of the connection elements respectively.
  • This can be achieved, for example, in that the jacket tube is constructed in several parts in such a way that the Pipe sections for the connection ends in the heating coil receiving pipe section with the interposition of a thermal insulation.
  • This goes without saying also only possible at the end of the tubular heater, which is intended to accommodate the temperature sensor. It is also possible to select the temperature sensor in this way or dimension that when the operating temperature is reached on the part of the heating coil of the temperature sensor is able to increase the temperature of the medium to be heated monitor.
  • the temperature sensor should be close to the inner wall the jacket tube be arranged so that he the temperature of the medium to be monitored without difficulty can. It can be provided here, for example, that the Temperature sensor on the inner wall of the casing tube or in close proximity to it.
  • the one near the inner wall of the casing tube in the unheated Section of the tubular heater arranged temperature sensor can take a variety of forms. So there is Possibility that it is only point-shaped, so that, for example, based on a medium level, at the top End of this level at just the medium covered tubular heater is arranged. Likewise, he can order temperature monitoring even at a lower fill level of the medium to be heated in a ring be formed in such a way that it preferably along the circular cross section of the casing tube at the Inner wall abuts or arranged in close proximity to this is.
  • the temperature sensor can use a wide variety of elements be educated. So it is possible that, for example formed by an NTC, PTC or bimetal element is. There is also the possibility that it as a resistance wire is trained.
  • the temperature sensor can also be used an element with a negative or positive temperature gradient his. Furthermore, the temperature sensor can be used as a Element designed to change its resistance value a measurement of the temperature allowed.
  • the temperature sensor in the unheated end of the Tubular radiator can be inserted as far that it one hand not about heat conduction effects from that of the Radiant temperature is affected, but on the other hand is able to monitor the temperature of the Capture medium safely and reliably.
  • the tubular heaters are manufactured in large numbers.
  • Tubular radiators with different operating temperatures can be protected by an overload protection device and / or distinguish the temperature sensor.
  • the overload protection and / or the temperature sensor can be inserted from the outside be formed in the end of the tubular heater can.
  • the overload protection and / or the temperature sensor by appropriate measures be fixed at the tubular radiator end so that they do not are more extendable to the outside.
  • the overload protection and / or to design the temperature sensor so that this of can be replaced outside.
  • the temperature sensor To control the operating temperature of the medium to be heated is the temperature sensor with a control device that controls the power supply to the heating coil, connected.
  • the temperature sensor In First and foremost is the task of the temperature sensor maintain the desired temperature for the medium to be heated. But there is also the possibility of the temperature sensor as a further or sole safeguard against melting of the tubular heater. This is particularly so possible if the control device has two stages that is, until the operating temperature is reached the power supply to the heating coil accordingly controls, and when the operating temperature is exceeded and reached a predetermined temperature before melting of the tubular heater completely the power supply to the heating coil in derogation. This will ensure that at a failure of the overload protection or a technical Defect, in spite of the overload protection responding the heating coil continues to be supplied with power, or if there is no overload protection, the tubular heater is safely switched off.
  • the tubular heater is any Can take shape. So there is a possibility that it is 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 can be one or more Temperature sensors in the manner described above and Provided way in the unheated pipe ends of the tubular heater his.
  • Figure 1 is one end of a tubular heater according to the invention 10 shown.
  • the other end of the tubular heater 10, which is not shown can also be constructed.
  • the tubular heater 10 is essentially elongated or a U, C or has a hairpin shape.
  • the heating coil 14 is attached to a connecting pin 18, which a has elongated conical end 18a, which adjoins one essentially cylindrical head 18b connects.
  • the attachment the heating coil 14 at the conical end 18a of the connecting bolt 18 takes place after the heating coil has been pushed on 14 at a point 20, for example by welding. in this connection can preferably be a non-contact welding technique, such as For example, the laser beam welding technology can be used.
  • connecting tube 22 Via the cylindrical head 18b of the connecting bolt 18th and the welding point 20 can be pushed a connecting tube 22 be pressed onto the weld 20, like this emerges from Figure 1.
  • the connecting pipe 22 is one sleeve-shaped, stepped insulating bead 24 concentrically in Jacket tube 12 held, the front end of the connecting tube 22 protrudes beyond the free end of the insulating bead 24.
  • a substantially cylindrical Overload fuse 26 for example a fuse, inserted, which is attached to a connecting wire piece 28 is.
  • An insulating tube is over the connecting wire piece 28 30 pushed. If necessary, the tubular heater 10 can also get along without overload protection 26.
  • the insulating bead 24 has its, based on Figures 1 and 2, the upper end of a groove 24a, which serves to receive a temperature sensor 32.
  • the groove extends here 24a from the outside into the inside of the casing tube 12, the Groove 24a but not completely to the end of the insulating bead 24 is enough.
  • the temperature sensor inserted into the groove 24a 32 can be an NTC element, for example.
  • the embodiment is the temperature sensor 32 as point-shaped element. He lies like this in particular emerges from Figure 1, on the inside of the Jacket tube 12 on.
  • the fuse 26 can be replaced or not interchangeable and the temperature sensor 32 interchangeable or not be designed to be interchangeable from the outside. Should not after installing the temperature sensor 32 be interchangeable, like this in FIG is shown, the groove 24a with a plug 34, for example made of resin.
  • the temperature sensor 32 is over one Line element 36 with a not shown Control device connected, which depending on the Temperature sensor 32 detected temperature the power supply from a power source, also not shown controls the heating coil 14.
  • the temperature sensor 32 outside the area of the heating coil 14, that is in cold end of the tubular heater 10 is arranged. This will an influence on the temperature sensor 32 by the Heating coil 14 radiated temperature or heat excluded. As can further be seen from FIG. 1, the temperature sensor to about the middle of the overload protection 26 in the inserted unheated end of the tubular heater 10. in principle the temperature sensor 32 can also reach the heating coil 14 inserted into the tubular radiator end if ensured is that there is adequate insulation between the heating coil 14 and the temperature sensor 32 is present. In the present case, this insulation is due to the material the insulating bead formed

Landscapes

  • Resistance Heating (AREA)
  • Control Of Resistance Heating (AREA)
  • Pipe Accessories (AREA)

Claims (17)

  1. Élément chauffant tubulaire, comprenant une gaine (12), un filament (14) logé dans la gaine (12) et enrobé dans un matériau isolant (16), des éléments de jonction (18, 22) disposés aux extrémités du filament (14) et par l'intermédiaire desquels le filament (14) est relié à une source de courant, et au moins un capteur de température (32) disposé dans la gaine (12) au voisinage immédiat de la paroi interne (12a) de la gaine (12) et à distance de l'élément de jonction (18, 22),
    caractérisé en ce qu'entre l'élément de jonction (18, 22) et le capteur de température (32) qui est disposé dans la zone de l'élément de jonction (18, 22) est prévue une couche thermiquement isolante (24), qui sépare totalement l'élément de jonction (18, 22) du capteur de température (32) au moyen d'un corps isolant enveloppant (24).
  2. Élément chauffant tubulaire suivant la revendication 1,
    caractérisé en ce que le capteur de température (32) est appliqué sur la paroi interne (12a) de la gaine (12).
  3. Élément chauffant tubulaire suivant l'une des revendications 1 et 2,
    caractérisé en ce que le capteur de température (32) est disposé en forme d'anneau le long de la paroi interne (12a) de la gaine.
  4. Élément chauffant tubulaire suivant l'une des revendications 1 à 3,
    caractérisé en ce que le capteur de température (32) est formé par un élément CTN.
  5. Élément chauffant tubulaire suivant l'une des revendications 1 à 3,
    caractérisé en ce que le capteur de température (32) est formé par un élément CTP.
  6. Élément chauffant tubulaire suivant l'une des revendications 1 à 3,
    caractérisé en ce que le capteur de température (32) est formé par un élément bimétallique.
  7. Élément chauffant tubulaire suivant Tune des revendications 1 à 3,
    caractérisé en ce que le capteur de température (32) est formé par un fil de résistance.
  8. Élément chauffant tubulaire suivant l'une des revendications 1 à 7,
    caractérisé en ce que le capteur de température (32) est disposé dans la direction axiale avant l'élément de jonction (18, 22).
  9. Élément chauffant tubulaire suivant l'une des revendications 1 à 7,
    caractérisé en ce que le capteur de température (32) est disposé dans la direction axiale après l'élément de jonction (18, 22).
  10. Élément chauffant tubulaire suivant l'une des revendications 1 à 9,
    caractérisé en ce que le corps isolant est formé par une masse d'oxyde de magnésium (24).
  11. Élément chauffant tubulaire suivant l'une des revendications 1 à 9,
    caractérisé en ce que le corps isolant (24) est formé par un liquide.
  12. Élément chauffant tubulaire suivant l'une des revendications 1 à 11,
    caractérisé en ce qu'entre le capteur de température (32) et l'élément de jonction (18, 22) est prévue une couche de matériau dont la conductivité thermique est variable en fonction de la température.
  13. Élément chauffant tubulaire suivant la revendication 12,
    caractérisé en ce que la couche de matériau présente une conductivité thermique supérieure en cas de dépassement d'une température limite.
  14. Élément chauffant tubulaire suivant l'une des revendications 1 à 13,
    caractérisé en ce que le capteur de température (32) est réalisé avec une possibilité d'insertion de l'extérieur.
  15. Élément chauffant tubulaire suivant l'une des revendications 1 à 14,
    caractérisé en ce que le capteur de température (32) est relié à un dispositif de commande qui commande l'alimentation en courant du filament (14).
  16. Élément chauffant tubulaire suivant la revendication 15,
    caractérisé en ce que le dispositif de commande a une configuration à deux étages.
  17. Élément chauffant tubulaire suivant l'une des revendications 1 à 16,
    caractérisé en ce qu'il est prévu au moins une protection contre la surcharge (26), qui est reliée directement ou indirectement au filament (14) et montée de préférence en série avec au moins un élément de jonction (18, 22).
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 EP0660644A2 (fr) 1995-06-28
EP0660644A3 EP0660644A3 (fr) 1995-12-20
EP0660644B1 true 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)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU3929299A (en) * 1999-04-28 2000-11-17 I.R.C.A. S.P.A. - Industria Resistenze Corazzate E Affini Resistance element for defrosting evaporators in refrigeration units
DE19937492C2 (de) 1999-08-07 2001-08-23 Mfh Hyperthermiesysteme Gmbh Magnetfeldapplikator zur Aufheizung von magnetischen oder magnetisierbaren Substanzen oder Festkörpern in biologischem Gewebe
DE19941901A1 (de) * 1999-09-02 2001-03-29 Bleckmann Gmbh Lamprechtshause Rohrheizkörper mit NTC/PTC-Absicherung
DE10118922C1 (de) 2001-04-18 2003-04-30 Martin Hess Verfahren zur Sicherung und Regelung einer elektrischen, explosionsgeschützten Heizung und Vorrichtung zur Durchführung des Verfahrens
US7347099B2 (en) 2004-07-16 2008-03-25 Rosemount Inc. Pressure transducer with external heater
ES1058126Y (es) * 2004-07-20 2005-02-16 Termoelectrica Vila S A Dispositivo de climatizacion para vehiculos y similares
US7679033B2 (en) * 2005-09-29 2010-03-16 Rosemount Inc. Process field device temperature control
DE202017100816U1 (de) 2017-02-15 2017-03-02 Türk & Hillinger GmbH Heizpatrone mit Temperatursensor

Family Cites Families (5)

* 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
US4124793A (en) * 1978-01-13 1978-11-07 Metaframe Corporation Aquarium water heater
DE3323605A1 (de) * 1983-06-30 1985-01-10 Patzner Gmbh & Co Heizkoerper fuer einen kuechenkessel
DE4014753A1 (de) * 1990-05-08 1991-11-14 Elpag Ag Chur Rohrheizkoerper mit sicherung
EP0543655B1 (fr) * 1991-11-21 1995-05-10 Lawrence Plc Elément chauffant immersible

Also Published As

Publication number Publication date
ES2174861T3 (es) 2002-11-16
EP0660644A3 (fr) 1995-12-20
DE59410109D1 (de) 2002-05-29
DE4344341A1 (de) 1995-07-06
EP0660644A2 (fr) 1995-06-28

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