EP3883338A1 - Chauffage compact pourvu de radiateur à tube de protection - Google Patents

Chauffage compact pourvu de radiateur à tube de protection Download PDF

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Publication number
EP3883338A1
EP3883338A1 EP21162769.0A EP21162769A EP3883338A1 EP 3883338 A1 EP3883338 A1 EP 3883338A1 EP 21162769 A EP21162769 A EP 21162769A EP 3883338 A1 EP3883338 A1 EP 3883338A1
Authority
EP
European Patent Office
Prior art keywords
heating element
heating wire
wire coils
element according
jacketed
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.)
Pending
Application number
EP21162769.0A
Other languages
German (de)
English (en)
Inventor
Matthias Gartner
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.)
Eichenauer Heizelemente GmbH and Co KG
Original Assignee
Eichenauer Heizelemente GmbH and Co KG
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 Eichenauer Heizelemente GmbH and Co KG filed Critical Eichenauer Heizelemente GmbH and Co KG
Publication of EP3883338A1 publication Critical patent/EP3883338A1/fr
Pending legal-status Critical Current

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    • 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
    • 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
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/014—Heaters using resistive wires or cables not provided for in H05B3/54
    • 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
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/016—Heaters using particular connecting means

Definitions

  • the invention is based on a tubular heating element with a connecting pin at both ends of the tubular casing, with a heating conductor in electrical connection between the connecting pins at the two ends inside the tubular casing and the rest of the space in the tubular casing with a powdery or granular metal oxide, especially magnesium oxide, is replenished.
  • the task is therefore to produce a tubular heating element with a very high output at voltages of up to 120V, in particular up to 60V.
  • a further object of the invention is to use a tubular heating element to produce a powerful compact heater for smaller supply voltages below 120V, in particular of at most 60V, which, despite its high performance, only requires a small volume.
  • heating wire coils instead of a single heating wire, at least 4 heating wire coils are arranged in the interior of the jacket tube, for example 5 heating wire coils.
  • the heating wire coils can be arranged concentrically.
  • the coils can have different winding diameters and can therefore be wound very compactly.
  • the coils preferably all have the same winding diameter and are therefore on a line when viewed axially.
  • the coils are twisted into one another, thus forming a multiple helix.
  • the heating wires can at least partially touch one another.
  • contacting heating wire turns or those with a small turn spacing are insulated from one another in one embodiment, preferably by an outer insulation layer such as an oxide layer.
  • an outer insulation layer such as an oxide layer.
  • the heating wire coils can be attached individually or in groups to several connection pins per end. This allows different Controls produce different combinations of resistors and thus different powers. However, all heating wire coils are preferably fastened at the ends to a common connection pin.
  • the heating wire coils are attached to a preferably cylindrical side wall of connection pins.
  • the connection pin contacting the heating wire coils is preferably solid.
  • the heating wires are advantageously fastened by welding, in particular by spot welding.
  • the heating wires are preferably fastened to the connection pins in an axially offset manner, in particular along an axial line.
  • the heating wires lying next to one another touch at least in the fastening area.
  • all of the wires can advantageously be fastened in a single operation. In particular in the case of heating wire coils with a small winding spacing, this fastening does not lead to heating wire coils that are unevenly wound into one another with short circuits and voltage bridges.
  • the connecting pins have an end section which is of reduced thickness. This end section can protrude into the heating wire coils and contact them, in particular by welding.
  • heating wire coils and connection pins can be squeezed, i.e. pressed so strongly that plastic deformation occurs, i.e. round wire, for example, is somewhat flattened. After the squeezing, welding can take place. It is also possible, in particular, for a sleeve to surround the contact area of the heating wire coils and connection pin and for the sleeve to be squeezed and / or welded after being pushed on.
  • ends of heating wire coils are common, preferably twisted together, fastened in a sleeve and led to the outside.
  • Fastening can take place, for example, by squeezing or crimping. If, which is preferred, the heating wire coils are made of round wire, the wire then no longer has a circular cross-section at its crimped end section, but is somewhat flattened. Alternatively or additionally, soldering or welding can take place.
  • This sleeve can be designed as an end section of a connecting pin, but is preferably a separate component.
  • an end section of the connecting pin can be introduced into the sleeve from its opposite end face prior to fastening, so that the end of the connecting pin and the end of the heating wire coils in the sleeve are opposite one another with contact or a small distance.
  • the heating wires protrude to the opposite end of the sleeve.
  • the end of the heating wires is preferably flush with the end of the sleeve.
  • This can be achieved by post-processing, for example by inserting the heating wire coils into the sleeve and then cutting off or grinding off an end section of the sleeve together with the ends of the heating wires inserted therein. This creates a flat face which can then be connected to the face end of the connection pin, in particular by resistance welding.
  • the sleeve can be pressed together with the heating wires located therein, that is to say plastically deformed, for example compression-molded.
  • the sleeve and the connecting pin preferably have similar, extremely preferably the same, outer diameter.
  • connection pin in tubular heaters is usually made of steel.
  • the connection pin in the tubular heater according to the invention is preferably made of stainless steel, in particular of a stainless steel with a specific resistance lower than, for example, 0.6 ohm mm 2 / m, in particular less than 0.4 ohm mm 2 / m. This advantageously leads to a better welded connection, in particular in the case of a welded connection on the end face.
  • the connecting pins preferably protrude from the jacket tube and contact the heating wire coils in the jacket tube.
  • the heating wire coils also protrude from one or both ends of the jacket tube and the connection pin (s) also outside the jacket tube Contact the jacket pipe.
  • the connection pin in question can also be hard-soldered to the heating coils, since the temperatures outside the casing pipe do not rise by far as high as in the casing pipe, even with high heating outputs.
  • the heating wire coils preferably have a relative pitch S R of at least 1, for example 2 or more.
  • the relative slope S R is therefore preferably much greater than in conventional tubular heaters with only one or two heating wire coils. In this way, a greater heating output can advantageously be achieved.
  • the relative pitch S R can be calculated for a given coil by dividing the pitch s associated with one revolution, defined as the axial distance between two adjacent turns of the same heating wire, by the outer diameter D A of the wire coil.
  • the outer diameter DA of the heating coil is 2.5 to 6 times, preferably only 2.5 to 4.5 times the wire diameter d. As has been shown, this dimensioning is particularly advantageous taking into account the limited surface load on the heating wire and a compact design.
  • Jacketed tubular heating elements produced according to the invention preferably have a relative resistance of less than 1 ohm / m in relation to the straight, heated tubular jacket section. Nevertheless, the diameter of the jacket tube is at most 12 mm, preferably at most 9 mm, extremely preferably at most 7 mm.
  • alloys of two or more metals are used as heating wires in tubular heating elements, which have a relatively high specific electrical resistance of over 1 ohm mm 2 / m and have a low tendency to oxidation.
  • metal alloys are preferably used as heating wire according to the invention which have a specific resistance of less than 0.8 ohm mm 2 / m, in particular less than 0.4 ohm mm 2 / m, that is to say are not typical heating conductor alloys.
  • the preferred metal alloy also has a temperature resistance of at least 600.degree. C., preferably at least 1000.degree.
  • the tubular heating element is bent several times and / or continuously.
  • the tubular heating element is bent in such a way that the two tubular tubular ends have approximately the same spatial orientation.
  • the tubular heating element is advantageously bent in a helical and / or spiral and / or meandering manner. Most preferably, at least one bend has at least 90 ° and a central bending radius of at most twice the casing tube diameter. The tubular heating element bent in this way results in an extremely powerful compact heater.
  • Fig. 1 shows schematically an embodiment of a tubular heating element according to the invention in a multiple cut partial view.
  • the first section is a tangential section in the axial direction of the jacket tube 1 in order to reveal the inside of the jacket tube 1.
  • the jacket tube 1 is cut off at a distance from the jacket tube end 1.1.
  • the heating wires 5.1-5.5 of the heating wire coils are cut off individually at a greater distance from the casing pipe end 1.1 than the casing pipe 1 itself for better illustration. Without the cuts, the jacket tube 1 and the heating wires 5.1-5.5 would extend to an opposite second end of the jacket tube, which is not shown here.
  • heating wires 5.1-5.5 are arranged helically with the same winding diameter and the remaining space 7 is filled with metal oxide powder.
  • All heating wire coils have the same pitch; so it has approximately the same distances between adjacent heating wire turns.
  • the arrangement of the heating wires 5.1-5.5 among one another is retained over the entire distance between the two ends of the jacket tube 1, ie the sequence between the heating wires 5.1-5.5 remains unchanged over the entire distance.
  • the heating wires 5.1-5.5 thus form a multiple helix.
  • the ends of the heating wires 5.1-5.5 are also wound or plugged onto an end section of a connecting pin 2, also in compliance with their sequence, the contact pin 4 of which protrudes from the casing pipe 1.
  • Each heating wire 5.1-5.5 preferably has at least one full turn, extremely preferably at least three full turns, contact with the connecting pin 2.
  • the fastening of the heating wires 5.1-5.5 on the cylindrical side wall of the connecting pin 2 is in the exemplary embodiment by spot welding with a elongated electrode takes place, which fixes all heating wires 5.1-5.5 on the connection pin 2 at the same time.
  • all of the fastening points 6.1-6.5 lie on one line, extremely preferably on an axial line of the connection pin 2, in this exemplary embodiment with spacings between the heating wires 5.1-5.5.
  • the heating wires 5.1-5.5 are preferably in mutual contact the fastening points 6.1 - 6.5 arranged.
  • the fastenings can, however, also take place one after the other, or the fastening points 6.1-6.5 are distributed circumferentially and axially at the same height as the connecting pin 2. Other types of fastening are also possible.
  • the finished tubular heating element is sealed at its ends between the connecting pin 2 and the tubular casing 1 by a socket 3.
  • the straight tubular heating element shown is bent several times or continuously after its completion (not shown). This creates a powerful, compact radiator.
  • Fig. 1 the contact between the heating wire coils and the connection pin 2 of the contact pin 4 is shown only schematically and not to scale.
  • Fig. 2 shows a true-to-scale example of the contact between four heating wire coils 5.1-5.4 and a connection pin 2.
  • the connection pin 2 has an end section 2.1, the thickness of which is reduced, i.e. smaller than the remaining part of the connection pin and, in particular, also smaller than the thickness of the connection pin 2 formed contact pins 4 at the opposite end.
  • the end section 2.1 of the connecting pin 2 protrudes into the heating wire coils 5.1-5.4.
  • Fig. 3 shows a longitudinal section of a portion of FIGS. 2 and 4 shows a cross section to Fig. 2 .
  • the heating wire coils are made of round wire. After the heating wire coils have been plugged onto the end section 2.1 of the connection pin 2, the heating wire coils can still be squeezed there. As a result, the heating wire 5.1-5.4 is plastically deformed in this area, so that the cross-section of the heating wire 5.1-5.4 and the end section 2.1 of the connecting pin 2 are no longer circular there, but rather flattened somewhat.
  • the common outer contour is reduced by the compression with the reduction of the gaps and the entire connection area is more compact. In this way, the contact area to the connection pin 2 is increased.
  • the heating wire coils are preferably welded to the end section 2.1 of the connecting pin 2.
  • the contacting point can also have an outer sleeve 8 which surrounds the heating wires 5.1-5.4 with the end section 2.1.
  • compression by squeezing the contact area is also preferably carried out in this embodiment.
  • Fig. 5 as well as the Figures 6a and 6b show a further example of the contact between four heating wire coils and a contact pin 2.
  • This exemplary embodiment differs from the exemplary embodiment in FIG Figures 2 to 4 essentially in that the end section 2.1 is at least partially pushed into a sleeve 8 from the first side and the ends of the heating wire coils 5.1-5.4 are pushed into the sleeve from the second side, their end faces ideally touching.
  • the sleeve 8 was pressed after it had been pushed on, as a result of which in turn the underlying end sections of the heating wires 5.1-5.4 and the end section 2.1 were plastically deformed, that is to say pressed somewhat flat.
  • welding is then preferably carried out for secure contacting.
  • an end section of the connecting pin can protrude into the heating coils.
  • the end section 2.1 of the connecting pin 2 does not protrude into the heating wire coils 5.1-5.4, but the end of the connecting pin 2 and the end of the heating wire coils 5.1-5.4 are opposite each other in the sleeve 8 with contact or a small distance.
  • the contact is preferably made by introducing solder into the sleeve 8.
  • soldering is only effective in applications in which the application temperature does not reach the solder melting temperature.
  • FIG. 7 Another example of contacting is in Fig. 7 shown.
  • only the heating wires 5.1-5.4 are introduced into a sleeve 8 and connected to the sleeve 8, preferably welded.
  • the internal heating wires 5.1-5.4 protrude up to the end face of the sleeve 8, which is made flat in particular by machining.
  • the end face of the end section 2.1 is then connected to this end face of the sleeve 8, in particular connected by resistance welding.
  • the sleeve and the end section 2.1 preferably have similar, extremely preferably the same, outer diameter.
  • All of the examples shown above of the contact between heating wire coils 5.1-5.4 and the end section 2.1 of the connection pin 2 are preferably implemented in such a way that this contact lies within the jacket tube 1.
  • the contact pin 4 then protrudes from the jacket tube 1 and the end section 2.1 of the connecting pin 2 contacting the heating wire coils is in the jacket pipe 1.
  • the heating wire coils 5.1-5.4 protrude from the jacket pipe 1 and the contact between heating wire coils 5.1 - 5.4 and end section 2.1 takes place outside of the jacket pipe 1, as in the case of Fig. 8 embodiment shown. Since the temperatures outside the jacket tube 1 are by far not as high as in the jacket tube 1, instead of welding, soldering or even just crimping or squeezing can be used to form contacts in this case

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  • Resistance Heating (AREA)
EP21162769.0A 2020-03-17 2021-03-16 Chauffage compact pourvu de radiateur à tube de protection Pending EP3883338A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020001751.7A DE102020001751A1 (de) 2020-03-17 2020-03-17 Kompaktheizer mit Mantelrohrheizkörper

Publications (1)

Publication Number Publication Date
EP3883338A1 true EP3883338A1 (fr) 2021-09-22

Family

ID=74884834

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21162769.0A Pending EP3883338A1 (fr) 2020-03-17 2021-03-16 Chauffage compact pourvu de radiateur à tube de protection

Country Status (2)

Country Link
EP (1) EP3883338A1 (fr)
DE (1) DE102020001751A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210112632A1 (en) * 2019-10-15 2021-04-15 Türk & Hillinger GmbH Electrical Heating Element, Electrical Heating Device, and Method for Manufacturing an Electrical Heating Device with Such a Heating Element
US20210112634A1 (en) * 2019-10-15 2021-04-15 Türk & Hillinger GmbH Electric tubular heating element and related method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB658711A (en) * 1948-06-09 1951-10-10 British Thomson Houston Co Ltd Improvements in and relating to electric heating units
US2858401A (en) * 1956-02-27 1958-10-28 Gen Electric Electric heating units and methods of making the same
FR2723284A1 (fr) * 1994-07-26 1996-02-02 Seb Sa Element chauffant blinde multipuissance
US6104011A (en) * 1997-09-04 2000-08-15 Watlow Electric Manufacturing Company Sheathed thermocouple with internal coiled wires
US20140178057A1 (en) * 2012-12-21 2014-06-26 Eemax, Inc. Next generation bare wire water heater

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB658711A (en) * 1948-06-09 1951-10-10 British Thomson Houston Co Ltd Improvements in and relating to electric heating units
US2858401A (en) * 1956-02-27 1958-10-28 Gen Electric Electric heating units and methods of making the same
FR2723284A1 (fr) * 1994-07-26 1996-02-02 Seb Sa Element chauffant blinde multipuissance
US6104011A (en) * 1997-09-04 2000-08-15 Watlow Electric Manufacturing Company Sheathed thermocouple with internal coiled wires
US20140178057A1 (en) * 2012-12-21 2014-06-26 Eemax, Inc. Next generation bare wire water heater

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210112632A1 (en) * 2019-10-15 2021-04-15 Türk & Hillinger GmbH Electrical Heating Element, Electrical Heating Device, and Method for Manufacturing an Electrical Heating Device with Such a Heating Element
US20210112634A1 (en) * 2019-10-15 2021-04-15 Türk & Hillinger GmbH Electric tubular heating element and related method
US11895744B2 (en) * 2019-10-15 2024-02-06 Türk & Hillinger GmbH Electric tubular heating element and related method
US11895743B2 (en) * 2019-10-15 2024-02-06 Türk & Hillinger GmbH Electrical heating element, electrical heating device, and method for manufacturing an electrical heating device with such a heating element

Also Published As

Publication number Publication date
DE102020001751A1 (de) 2021-09-23

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