WO2022167649A1 - Verfahren zur herstellung einer rohrförmigen heizpatrone für elektrische heizvorrichtungen, heizelementrohling für eine solche heizpatrone sowie heizpatrone - Google Patents
Verfahren zur herstellung einer rohrförmigen heizpatrone für elektrische heizvorrichtungen, heizelementrohling für eine solche heizpatrone sowie heizpatrone Download PDFInfo
- Publication number
- WO2022167649A1 WO2022167649A1 PCT/EP2022/052864 EP2022052864W WO2022167649A1 WO 2022167649 A1 WO2022167649 A1 WO 2022167649A1 EP 2022052864 W EP2022052864 W EP 2022052864W WO 2022167649 A1 WO2022167649 A1 WO 2022167649A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- heating
- heating element
- element blank
- metal housing
- cartridge
- Prior art date
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 326
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 229910052751 metal Inorganic materials 0.000 claims abstract description 102
- 239000002184 metal Substances 0.000 claims abstract description 102
- 239000004020 conductor Substances 0.000 claims abstract description 82
- 238000000034 method Methods 0.000 claims abstract description 35
- 239000000463 material Substances 0.000 claims abstract description 26
- 238000012545 processing Methods 0.000 claims abstract description 6
- 238000011049 filling Methods 0.000 claims abstract description 5
- 238000007906 compression Methods 0.000 claims description 38
- 230000006835 compression Effects 0.000 claims description 33
- 238000005520 cutting process Methods 0.000 claims description 32
- 239000008187 granular material Substances 0.000 claims description 22
- 238000005056 compaction Methods 0.000 claims description 19
- 239000000919 ceramic Substances 0.000 claims description 10
- 229910010293 ceramic material Inorganic materials 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000007373 indentation Methods 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 6
- 238000003698 laser cutting Methods 0.000 claims description 4
- 229910052582 BN Inorganic materials 0.000 claims description 3
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 3
- 238000005530 etching Methods 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 2
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 238000003754 machining Methods 0.000 claims description 2
- 238000003801 milling Methods 0.000 claims description 2
- 238000007514 turning Methods 0.000 claims description 2
- 238000007493 shaping process Methods 0.000 claims 1
- 230000003247 decreasing effect Effects 0.000 abstract 2
- 239000011810 insulating material Substances 0.000 description 6
- 238000005524 ceramic coating Methods 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 5
- 239000000395 magnesium oxide Substances 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 4
- 238000004049 embossing Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000012777 electrically insulating material Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000010329 laser etching Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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
- 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
- H05B3/44—Heating elements having the shape of rods or tubes non-flexible heating conductor arranged within rods or tubes of 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
- 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
- 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
- H05B3/52—Apparatus or processes for filling or compressing insulating material in tubes
Definitions
- Electric cartridge heaters have been known for many years. As a rule, they have at least one tubular metal jacket, in the interior of which at least one heating conductor is arranged. The space between the heating conductor and the metal jacket is regularly lined with a material that conducts heat well but is electrically insulating, such as e.g. B. Magnesium oxide, filled to prevent unwanted electrical contact between the heating conductor and the metal sheath.
- cartridge heaters are known that have at least two lead-out leads to the heating conductor on one side of the metal jacket.
- cartridge heaters are also used in which at least one supply line to the heating conductor protrudes from the respective end faces of the cartridge heater.
- heating cartridges are known in which the metal housing itself serves as one of the supply lines.
- the essential element of these heating cartridges is the inside of the metal jacket or Heat conductor located in the metal housing.
- These electrical heating elements with which electrical energy is converted into heat, are usually produced by providing a heating conductor material in the form of a wire and this wire - if it is not used stretched anyway - either towards a carrier or freely a space curve is bent, wrapped or coiled.
- a heating conductor material in the form of a wire and this wire - if it is not used stretched anyway - either towards a carrier or freely a space curve is bent, wrapped or coiled.
- the aim of the present invention is to specify a method that is very simple in terms of production technology and is therefore cost-effective for the production of a tubular heating cartridge for electrical heating devices that is also very small in size and is suitable for reducing the aforementioned problems.
- the method should ensure reproducible electrical values of the heating cartridge in the simplest possible way, ie it should be particularly suitable for mass production.
- Another object of the invention is a suitable heating element or. to provide a suitable heating element blank that can be used in a simple manner for the aforementioned method. This object is achieved by a heating element blank according to claim 13.
- the method according to the invention for producing a tubular heating cartridge for electrical heating devices is distinguished by the following method steps:
- a heating element blank that can be mass-produced in this way and has a specific length and height is inserted into the interior of the tubular metal housing.
- Electrically insulating material for example insulating granules, in particular magnesium oxide granules, ceramic granules or boron nitride granules, is then filled into the tubular metal housing.
- insulating granulate instead of this insulating granulate, however, it is also possible to fill the space between the heating element blank and the metal housing with a tubular, porous ceramic material.
- a particularly porous ceramic rod can also be inserted into the intermediate space of the heating element blank.
- the insulation granules or the porous ceramic material such that the ultimately desired geometric shape of the heating element blank and / or the tubular heating cartridge with the metal housing and thus the electrical values can also be set to the desired final size .
- the geometric shape of the heating element blank usually changes to an overall length that is increased compared to the original heating element blank.
- the height or the diameter of the heating element blank is always reduced after compression compared to the height of the heating element blank previously inserted into the metal housing.
- the tubular metal housing of the cartridge heater After compression, the heating cartridge with its metal housing usually has an increased length, but always a reduced height or width. a reduced diameter. The ohmic resistance of the heating element blank or the heating cartridge.
- the method according to the invention for producing the heating cartridge is designed in such a way that the desired geometric shape, in particular of the metal housing and its ohmic setpoint values, are achieved.
- the metal housing Before closing, it must be ensured that sufficient material to be compacted is filled into the metal housing so that there are no empty spaces or poorly compacted areas within the metal housing in order to achieve optimum compaction and thus good heat transfer from the heating element blank to the metal housing develop .
- the insulating material which is usually present as granules, is, as mentioned, e.g. B. Magnesium oxide granules, increased from an original density by about 10% to 50% seals or is baked together.
- the insulating granulate lies with an increased degree of filling inside the metal housing after compacting with the method according to the invention and the cut edges of the heating element blank are thus optimally covered there.
- the result is optimal heat dissipation from the cut edges of the heating element blank to the metal housing.
- the heating element blank is separated from a plate-shaped body.
- the heating conductor structure is first separated from the plate-shaped body and in a subsequent step the cut or etched-out heating conductor structure is bent in a suitable manner in order to provide the ultimately desired structure and shape of a heating element blank.
- a heating conductor track structure can be separated from the plate-shaped body, which has, for example, two meandering heating conductor tracks connected via a connecting web and these two heating conductor track structures each have line ends.
- the two heating conductor track structures are then bent in an arc, preferably around a central axis, and a bend of 180° is also provided on the connecting web. In this way, very small heating element blanks can be produced.
- Suitable heating element blanks as they can be separated from plate-shaped or tubular bodies, are detailed in the applicant's German patent application no. 10 2019 127 753 . 1 disclosed and described. For the purpose of disclosure, reference is made here in its entirety to this German patent application and the heating element blanks described there and their manufacturing processes are incorporated into the present patent application by reference.
- suitable contact connections are attached to the conductor track ends of the heating element blank, which are led out of the metal housing of the heating cartridge at the front.
- the contact connections can only be carried out at one longitudinal end of the heating cartridge, but also at both ends.
- the heating element blank can be made from the plate-shaped or tubular body by means of laser cutting, water jet cutting, micro water jet cutting, etching, punching, sawing, milling, drilling, turning, grinding or the like. Particularly fine cuts and thus little material loss are possible using laser cutting, etching and micro water cutting.
- the compression takes place in such a way that the length of the heating element blank and/or the metal housing of the heating cartridge is increased by between z. B. about 1% to about 25% and / or a height reduction of z. B. about 3% to about 45%.
- the heating element blank has slots with opposing cutting has surfaces which are arranged orthogonally to the tubular wall of the metal housing.
- the cut surfaces are parallel to each other.
- the slits can also be selected in such a way that they are placed parallel to one another at an angle a to an orthogonal plane of the tubular wall of the metal housing or else at different angles to one another.
- the heating element blank after its processing or. is provided with an enlarged surface structure after assembly because the heating element blank after compression has unevenly distributed embossing on its surfaces and also on its cut surfaces.
- embossings create a larger, heat-dissipating surface of the strip heating conductor or of the heating element ensured. This is achieved by a positive flow of heat between the heating element blank and the insulating material.
- the compaction also ensures a high contact pressure and a larger heat-transferring surface between the heating element blank and the insulating material, which ensures good fixation of the entire heating cartridge and its contents. Such good fixation is necessary because the heating cartridges are regularly exposed to vibrations, impacts and alternating thermal stresses and without this good fixation it would be possible for the components inside the heating cartridge to slip.
- the heating element blank which is formed from a plate-shaped or tubular electrically conductive body, is coated with a ceramic material before it is inserted into the metal housing.
- a ceramic material Preferably for this Layering provided a porous ceramic material.
- Such a ceramic coating of the heating element blank makes it possible during the manufacturing process of the heating cartridge to dispense with centering devices that were previously necessary when assembling the heating cartridge.
- the heating insert i.e. the heating element blank, always had to be kept at a sufficient distance from the cartridge base and the wall of the jacket housing in order to center the structure of cartridge heaters. This was achieved through the use of special filling machines with centering devices or ceramic spacers were previously used.
- heating cartridges consist of a simple metal tube as a metal housing and are closed at the end with a cover.
- hollow cartridges are characterized by a double-walled tube, with the heating element blank and the insulating material mentioned being filled in between an inner tube and an outer tube.
- Such heating cartridges with a double-walled, tubular metal housing are closed at the end with an annular cover.
- Such cartridge heaters with double-walled Tube i.e. hollow cartridges, are predestined in particular for heating cylindrical bodies, but also as continuous-flow heaters for fluids or gases.
- FIG. 1A a first exemplary embodiment of a heating cartridge according to the invention in a partially broken sectional view before compression
- FIG. 1B the heating cartridge shown in FIG. 1A after compression
- FIG. 1C sectional views of FIG. 1A, i.e. before compression
- Fig. IE a detailed view of Figure 1C
- FIG. 1F a detailed view of figure ID
- Fig. IG a detailed view of the heating cartridge from FIG. 1A in the area of a slot with cut edges running perpendicular to the metal housing,
- FIG. 1H a representation similar to FIG. 1G with cutting edges running obliquely and parallel to one another
- Fig. II a similar representation to figure IG with cutting edges inclined to each other
- Fig. 2A shows a second exemplary embodiment of a heating cartridge in FIG. 5, partially in a broken view before compaction
- FIG. 2B the second exemplary embodiment of a heating cartridge according to the invention in a partially broken sectional view after compression
- FIG. 2C Sectional views of FIG. 2A and associated partial view according to a section D-D, FIG. 2D different sectional views of the heating cartridge shown in Figure 2A after compression,
- FIG. 2D sectional views for FIG. 2A and associated partial view according to a section D-D
- FIG. 3A a third exemplary embodiment of a heating cartridge in an exploded view
- Fig. 3B is a sectional view of FIG. 3A before the heating cartridge is compressed
- Fig. 3C is a sectional view of the cartridge heater of FIG. 3A after compression
- FIG. 4 a tubular body from which a heating element blank according to FIGS. 1A to 1F was cut out
- Fig. 5 a perspective view of a heating element blank, as used in the exemplary embodiment in FIGS. 2A to 2D,
- Fig. 6A a plate-shaped body from which a heating element structure is cut out
- Fig. 6B shows a heating element structure separated from FIG. 6A
- Fig. 6C a heating element blank bent from the heating element structure of FIG. 6D
- FIG. 7A another exemplary embodiment of a heating element blank in a perspective view
- FIG. 7B a heating cartridge of a further exemplary embodiment in a partially broken view with an inserted heating element blank according to FIG. 7A,
- Fig. 7C shows a detailed representation of the area E from FIG. 7B
- FIG. 8 different sectional representations of the heating conductor according to the heating element blank of FIG. 7A with indentations made
- FIG. 9 Representations A to E in FIG. 9 show the heating element blank already known from FIG. 6 in various process steps according to the method according to the invention
- FIG. 10 another exemplary embodiment of a heating cartridge according to the invention, which is designed as a hollow cartridge, in different views, and
- Fig. 11 shows a representation similar to that in FIGS. 7A, 7B and 70, the heating cartridge being designed as a hollow cartridge, however.
- FIG. 1A shows a heating cartridge 100 for electrical heating devices in a partially broken view.
- a heating cartridge 100 can be used, for example, in medical technology, the automotive industry, laboratory and analysis technology and in packaging machines. Thanks to the possibility of being able to build such cartridge heaters 100 very small, z. B. miniaturized plastic spray nozzles can be heated using heating channel technology.
- the cartridge heater 100 shown in FIG. 1A is shown in a state in which the cartridge heater 100 is not yet completely finished.
- the crucial step of compaction which is still to be explained below, has not yet taken place in the representation of FIG. 1A.
- the heating cartridge 100 already has all the components required for subsequent operation.
- the heating cartridge 100 in FIG. 1A has a tubular metal housing 20 which is closed at its left end with a cover 21 and at its right end with a second cover 23 preferably made of insulating material.
- the cover 21 can be connected in one piece to the tubular housing wall of the metal housing 20 den, but also as a separate part on the metal housing
- the metal housing 20 are attached. Within the metal housing 20 is located centrally to a longitudinal axis 12 or. center axis on
- Heating element blank 130 with a heating conductor structure or. a heating conductor 132 having a plurality of slots 133 , 134 and 137 .
- This heating element blank 130 has two meandering courses of a heating conductor track structure, both of which are connected to one another via a connecting web 136 in the vicinity of the cover 21 of the metal housing 20 shown on the left.
- the aforementioned heating conductor track structure is provided with widened conductor track ends 135, to which contact terminals 40, 42 are electrically conductively connected.
- the contact terminals 40 , 42 are routed through corresponding openings in the cover 23 and project out of the cover 23 on the right in the illustration in FIG. 1A.
- the heating element blank 130 shown in FIG. 1A is separated from a metallic, tubular body by methods suitable for this purpose.
- FIG. 4 shows such a metallic tubular body 160 with cutting lines 150 through which the heating element blank 130 can be separated from the tubular body 160 .
- the tubular body 160 can have any length, so that several heating element blanks 150 can be cut out of this tubular body 160 one after the other according to the cut lines 150 introduced.
- FIG. 4 also shows slot areas 133′, 134 and 137′, in which the material of the tubular body 160 is present in the illustration in FIG. However, this material is separated out after the slots 150 have been made and forms cutting waste. After this When these slit areas 133', 134', 137' are cut out, the heating element blank 130 shown in FIG. 1A with the slits 133, 134 and 137 remains.
- FIG. 1A and also FIG. 4 describe a specific form of a heating element blank 130 .
- the present invention is not limited to such a design of the heating element blank 130 . Rather, there are very different variants for producing such a heating element blank 150, which can be cut out not only from a tubular body, but also as a plate-shaped body.
- German patent application DE 10 2019 127 753. 1 of the applicant in which a wide variety of variants for producing a heating element blank from a plate-shaped or tubular body is described. All the variants mentioned there are also suitable for use in a heating cartridge, as will be explained further, within the scope of the present invention.
- This heating element blank 130 has a heating conductor track structure which is denoted by a length L1 in FIG. 1A.
- the diameter or the height of this heating element blank 130 is marked with the reference number Kl.
- the length of the entire heating cartridge 100 is L2.
- the outer diameter of the heating cartridge 100 is K2.
- in the space between Schuelementrohling 130 and metal housing 20 is an insulating, suitable for compression and than
- Material suitable for heat conductor filled As a material This is particularly useful for insulating granules, such as e.g. B. MgO granules, ceramic granules and also boron nitride granules.
- the heating cartridge 100 prepared according to FIG. 1A is subjected to a special compression process after the insulation granules 50 have been filled in, so that optimal heat conduction from the heating element blank 130 to the metal housing 20 is possible.
- the heating cartridge 100 prepared from FIG. 1A is exposed to high and high pressures from the outside. This is indicated in FIG. 1B by the arrows labeled T.
- This pressure can, for example, via rollers or suitable rolling machines or suitable pressing methods, for example via press jaws.
- the purpose of this compression is to ultimately produce a heating cartridge 100 that has the desired electrical parameters and also the intended geometric dimensions. The compression is therefore carried out until, on the one hand, the material 50 to be compressed is maximally compressed in an optimal manner and the heating cartridge 100 has reached its planned final dimensions.
- both the heating element blank 130 and the entire heating cartridge 100 each extend to a length L3 or L4.
- both the heating element blank 130 and the heating cartridge 100 experience a change in height, namely a reduction in height to the height K3 of the heating element blank 130 and to a height K4 of the metal housing 20 .
- the cover 21 arches inwards in the direction of the heating element blank 130, as shown in FIG. 1C.
- the opposite lid 23 undergoes a change in thickness.
- Slots 133, 134 and 137 also vary in width.
- the slots 133, 134 between the meandering course of the heating conductor track structure are thus widened, as shown in the two detail views detail A in FIG. 1C before compression and in FIG. ID after compression.
- the slots 133, 134 become wider, while the slot 137, which is machined parallel to the longitudinal axis 120 in the heating element blank 130, becomes narrower.
- the slot width of this longitudinal slot 137 is indicated in the sections BB of FIG. 1C and DD in FIG.
- the cross section of a heating conductor of the heating element structure of the heating element blank 130 also undergoes a change in thickness, namely an increase in thickness, as a result of the compression, as shown by the reference symbols A1, A2, A3 and A5 in FIGS. 1C and FIG.
- the wall of the metal housing 20 also undergoes a change in thickness according to the reference symbols A4 and A6 in FIG. 1C and FIG.
- FIGS. 1F and 1F show the change in thickness of the cross sections of the heating element conductor structure of the heating element blank 130, enlarged again.
- the metal housing 20 of the heating cartridge is enlarged in the area of a slot 133 of the heating element blank 130. ßert shown.
- a section of the heating conductor 132 can be seen with two coils shown in section, which are separated by the slot 133 .
- the heating conductor 132 has an upper surface 137 and a lower surface 138 which is closer to the longitudinal axis 12 . Both surfaces 137 and 138 are parallel to each other and also parallel to the inner wall of the tubular metal housing 20 .
- the cut surface 139 connecting the two surfaces 137 and 138 lies parallel to the opposite cut surface of the heating conductor 132 . Both cut surfaces 139 are parallel to a cut surface F, which is aligned orthogonally to the tubular wall of the metal housing 20 .
- the right angle is indicated in figure 1G with the reference sign a.
- the cut surfaces 139 result from the cutting out of the previously mentioned tubular or plate-shaped body.
- FIG. 1H Another exemplary embodiment is shown in FIG. 1H, in which the cut edges are not arranged parallel to the surface F, but are aligned parallel to one another.
- the angle a of the cutting edges 139 is now approximately 130°.
- the cut edges 139 of the opposing heating conductors 132 are aligned parallel to one another.
- Cut surfaces 139 can be aligned with one another, FIG. II shows. Here the cut surfaces 139 are not aligned parallel to one another, but at an angle to one another.
- the cutting edge 139 shown on the left in FIG. 11 has the cutting angle a as in FIG. 1H.
- the opposite cutting surface has an angle of -a to the surface F.
- cutting angles a can be chosen which are between 15° and 165° in relation to the cutting plane F are . Cutting angles of 30° to 150° are more favorable, cutting angles of 60° to 120° are particularly favorable. The oblique selection of these cutting angles in relation to the cutting plane F increases the surface area of the cutting surfaces 139 and thus also reduces the stress on the cutting edges during compaction.
- FIGS. 2A, 2B, 2C and 2D A second exemplary embodiment of a heating cartridge 200 according to the invention is shown in FIGS. 2A, 2B, 2C and 2D.
- This heating cartridge 200 essentially differs from the heating cartridge 100 described above in that a differently designed heating element blank 230 is used.
- the heating element blank 230 is now equipped with a bifilar heating conductor structure, but, as the detailed representation of FIG. Suitable separating methods are, for example, laser cutting, water jet cutting, micro water jet cutting, etching, punching or sawing.
- FIG. 5 again shows the separating or Cutting lines 250 and those areas 234 ′ and 240 which represent cutting waste after separation from the tubular body 260 .
- FIG. 5 shows the broadened conductor track ends 235 and the heating conductor tracks 232 of the heating element blank 230.
- the heating conductor track structure shown in FIG. 5 has a U-shaped connecting web 236, on which the outgoing heating conductor turn reverses again.
- FIG. 2A shows this heating element blank 230 inserted into the metal housing 20 with a spiral slot 234, the two conductor track ends 235 electrically connected to the contact connections 40, 42, the connection binding web 236 and the heating conductor track structure 232 .
- the heating element blank 230 is in turn surrounded by insulating granules to be compressed.
- FIG. 2A shows the heating cartridge 200 prior to compression.
- FIG. 2B shows the heating cartridge 200 shown in FIG. 2A after compression has taken place.
- the height reductions from K1 to K3 of the heating element blank 130 and the metal housing 20 from K2 to K4 appear again.
- the resulting changes in length of the heating element blank 230 and the metal housing 20 are again marked in FIG. 2B by the reference symbols L3 and L4.
- FIGS. 2C and 2D again show details on this.
- the changes in cross section of the heating conductor track structure of the heating element blank 230 are marked with the reference symbols A7 to A12.
- FIGS. 3A, 3B and 3C A third exemplary embodiment of a heating cartridge 300 is shown in FIGS. 3A, 3B and 3C.
- This heating cartridge 300 differs from the two aforementioned exemplary embodiments in one essential point, namely in the realization of the material to be compressed inside the metal housing 20 .
- the heating cartridge 300 has the already known metal housing 20 with the two covers 21 and 23 .
- the heating element blank 230 from the second exemplary embodiment is used here by way of example as the heating element blank 230 .
- an insulating rod 312 is now pushed into the interior of the heating element blank 230 and additionally between the metal housing 20 and the outer circumference of the heating element blank 230 insulating tube 310 used.
- the insulating rod 312 and the insulating tube 310 can each z. B. consist of a porous ceramic material.
- heating cartridge 300 is then filled into the remaining space I with insulating granulate 50, as described above, in order to avoid any dead space, i.e. space filled with air, as far as possible.
- the interior of the heating cartridge 300 filled in this way is then subjected to a compression process, which is again indicated by the arrows P in FIG. 3C.
- the heating element blank 130, 230 was cut out of a tubular body 160, 260, it is also within the scope of the present invention for the heating element blank to be cut out of a plate-shaped material.
- FIG. 6A shows, for example, a metallic plate made of copper material or the like in a side view. Such a plate can also be separated from a metal strip that has been wound on.
- a heating conductor track structure for example, as illustrated in FIG. 6B, is separated from the plate-shaped body 660 of FIG. 6A.
- This heating conductor track structure has two meandering line sections 632 which are connected to one another in the center via a connecting web 636 .
- the two sections 632 each have conductor track ends 635 on the left and right.
- An alternative embodiment of the connecting web is shown in dashed lines in FIG. 6C and provided with the reference number 636'. This dashed variant has the advantage that the heating element blank 630 can also be separated from a tubular body.
- the heating conductor track structure produced in this way is then bent several times to form a heating element blank 630 according to FIG. 6C.
- a U-shaped bend is made in the area of the connecting web 636, so that the two sections 632 lie one on top of the other.
- These two sections with the meandering heating conductor courses are then bent toward one another about the longitudinal axis 620, so that the course of the entire heating conductor track structure and thus of the heating element blank 630 results, as shown in FIG. 6C.
- FIG. 7A shows a perspective view of a heating element blank 730 which is designed similarly to the heating element blank 230 in FIG. 2A.
- the individual heating coil or the heating conductor 732 of a winding is selected to be significantly wider in the direction of the longitudinal axis 12 than in the example in FIG. 2A.
- this heating element blank 730 also has a U-shaped connecting web 736, the already mentioned heating conductor 732 and the slots 734 lying between the individual coils of the heating conductor 732.
- the heating element blank 730 has two conductor track ends 735 to which the contact connections 40 , 42 are connected.
- the heating element blank 730 designed in this way is inserted into a tubular metal housing 20, from which the contact connections 40, 42 protrude in the manner already explained.
- a tubular metal housing 20 from which the contact connections 40, 42 protrude in the manner already explained.
- between the metal housing 20 and the Heating element blank 730 is filled with compressible material 50, it being assumed that in the illustration in FIG. 7B the compression of this material 50 and the associated dimensional changes in the heating cartridge 700 have already taken place.
- the heating conductor 732 has the two surfaces 737 and 738 which lie parallel to one another, as well as cut surfaces 739 to the left and right thereof. In this exemplary embodiment, the cut surfaces 739 are parallel to one another.
- the already compacted material 50 is marked with the reference number 50 . It can be clearly seen in FIG. 7C that both the surfaces 737 and 738 and the cut surfaces 739 have an enlarged surface due to the compression, in that irregularly distributed indentations 770 are provided on these mentioned surfaces.
- embossments are marked with the reference number 770 .
- the indentations 770 become less or more pronounced.
- the type and design of the embossments 770 also depends on which compressible material 50 is filled into the metal housing 20 of the heating cartridge 700 . It has been found that particularly strong indentations 770 are achieved during compaction if MgO granules are selected. when compres- In the case of porous ceramic material, in particular ceramic tubes or ceramic rods, the indentations are significantly smaller.
- the compression is carried out in such a way that the length of the heating element blank 130, 230, 630 and/or the metal housing 20 increases by between about 1% and about 15% and/or a reduction in the height of the heating element blank 130, 230, 630 and/or the metal housing 20 of approximately 5% to approximately 25% in each case.
- the present invention also includes a heating element blank 130, 230, 630, which is formed from a tubular or plate-shaped and electrically conductive body 160, 260, 660 by machining, in that the tubular or plate-shaped body 160, 260 , 660 results in a deformable heating conductor track structure with a first overall length LI and a first height Kl and with at least two conductor track ends 135 , 125 , 635 and this heating element blank 130 , 230 , 630 designed in this way is used in the aforementioned method.
- a significant advantage of the method according to the invention is that due to the use of a heating element blank 130, 230, 630, 730 which was cut out of a plate-shaped or tubular metallic body 160, 260, 660, the resulting cut edges are Compress optimally contribute to heat transfer to the metal housing 50. After the compression, highly compressed insulation material lies against these cut edges, which promotes good heat transfer from the heating element blank 130 , 230 , 630 , 730 to the metal housing 50 .
- the heating element blank 130, 230, 630, 730 according to the invention in contrast to conventional heating wires, can have almost any cross-sectional shape can be designed very variably in order to enable optimal heat transfer.
- the tubular metal housing and the heating element blank are mounted parallel to one another, ie have the same direction of extension.
- the cut surfaces can be arranged entirely or partially at right angles to the outer casing of the tubular metal housing. It is also possible to arrange the surfaces of the heating element blank that are not machined by cutting completely or partially parallel to the outer casing of the metal housing.
- the tubular metal housing it is also possible to design the tubular metal housing as an electrical return conductor for the heating element or to provide several heating circuits for the heating element.
- FIGS. 9A to 9E Various production steps are shown in FIGS. 9A to 9E in order to produce a heating cartridge 600 as proposed by the present invention.
- the heating element blank 630 already known from FIG. 6C is shown again in a perspective view in FIG. 9A.
- the connecting web 636 ′ is formed in an arc shape and runs at least approximately concentrically around the center axis 12 .
- this heating element blank 630 is suitably cut out of a plate-shaped or tubular metallic body and optionally also bent.
- this heating element blank 630 is covered with an insulating coating, in the present case a ceramic coating 650. Only the conductor track ends 635 are not with this one Coating 650 provided. Porous ceramic material is particularly suitable as the coating 650 . Because of the coating 650 of the heating element blank 630, the heating element blank 630 can be inserted into the metal housing 20 without centering aids. The conductor tracks of the heating element blank 630 are thus insulated from the metallic housing 620 . This is shown in Figure 9C.
- the metal housing 20 is in turn provided with the housing base 21 and the housing cover 23 on the left and right. The material 50 to be compacted is filled into the interior of the metal housing 20 .
- the heating cartridge 600 prepared in this way is exposed to the compression process explained. This is illustrated in Figure 9D. As explained, the extension of the metal housing 20 achieved with the compression and the extension of the diameter of the metal housing 20 are shown in FIG. 9D.
- FIG. 9E shows the heating cartridge 600 explained again in a perspective view.
- FIG. 10 shows a further exemplary embodiment of a heating cartridge according to the invention.
- FIG. 10A shows the associated perspective view of the individual components
- FIG. 10B shows a sectional view before compression
- FIG. 10C shows a sectional view after compression of the heating cartridge.
- the metal housing 20 of the heating cartridge 1000 is designed as a hollow cartridge.
- the tubular metal housing 20 has a central inner tube 22 .
- This inner tube 22 and the tubular metal housing 20 are aligned concentrically to the longitudinal axis 12 .
- the heating element blank is inserted into the space between the metal housing 20 and the inner tube 22 .
- heating element blank 230 is a heating element blank 230, as has been explained in connection with FIGS. 2A to 2D.
- This heating element blank 230 in turn has two conductor track ends 235, to each of which a contact connection 40, 42 is connected. As can be seen from FIG.
- heating cartridge 1000 is closed on the side shown on the left in FIG. 10B with an annular housing base 21 and on its opposite end with an annular housing cover 23 .
- the heating cartridge 1000 is subjected to a compression step.
- a so-called calibration mandrel is expediently used for this purpose in the cavity of the inner tube 22 .
- This calibrating mandrel is provided with the reference number 52 and before the actual compaction process lies closely and flat against the inner wall of the inner tube 22, so that this inner tube 22 cannot narrow during the subsequent compaction process.
- the calibrating mandrel 52 is removed so that the completed heating cartridge 1000 can be pushed onto a cylindrical body, if necessary, in order to heat it up.
- FIGS. 11A, 11B and 11C A final exemplary embodiment is illustrated in connection with FIGS. 11A, 11B and 11C.
- the reference symbols already known will continue to be used.
- the heating element blank in FIG. 11A corresponds to the heating element blank 730 from FIG. 7A.
- This heating element blank 730 is now, in a manner similar to that shown in the exemplary embodiment in FIG. walled metal housing, that is to say in a tubular metal housing 20 with an inner tube 22 lying on the inside. This is shown in Figure 11B.
- the detail E according to FIG. 11C again shows the compacted material and the surface structure achieved as a result of the compaction with impressions 770 in the line sections 732 of the heating element blank 730 .
Landscapes
- Resistance Heating (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US18/276,268 US20240121861A1 (en) | 2021-02-08 | 2022-02-07 | Method for producing a tubular heating cartridge for electrical heating devices, heating element blank for such a heating cartridge, and a heating cartridge |
EP22707645.2A EP4289225A1 (de) | 2021-02-08 | 2022-02-07 | Verfahren zur herstellung einer rohrförmigen heizpatrone für elektrische heizvorrichtungen, heizelementrohling für eine solche heizpatrone sowie heizpatrone |
CN202280019386.3A CN116918453A (zh) | 2021-02-08 | 2022-02-07 | 用于制造用于电加热装置的管状加热筒的方法、用于这种加热筒的加热元件坯件以及加热筒 |
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DE102021102894.9 | 2021-02-08 | ||
DE102021102894.9A DE102021102894A1 (de) | 2021-02-08 | 2021-02-08 | Verfahren zur Herstellung einer rohrförmigen Heizpatrone für elektrische Heizvorrichtungen, Heizelementrohling für eine solche Heizpatrone sowie Heizpatrone |
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WO2022167649A1 true WO2022167649A1 (de) | 2022-08-11 |
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PCT/EP2022/052864 WO2022167649A1 (de) | 2021-02-08 | 2022-02-07 | Verfahren zur herstellung einer rohrförmigen heizpatrone für elektrische heizvorrichtungen, heizelementrohling für eine solche heizpatrone sowie heizpatrone |
Country Status (5)
Country | Link |
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US (1) | US20240121861A1 (de) |
EP (1) | EP4289225A1 (de) |
CN (1) | CN116918453A (de) |
DE (1) | DE102021102894A1 (de) |
WO (1) | WO2022167649A1 (de) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2853765A (en) * | 1954-08-26 | 1958-09-30 | Wiegand Co Edwin L | Method of making sheathed electric resistance heaters |
DE102013201205A1 (de) | 2012-01-25 | 2013-10-02 | GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) | Detektion von Kühlmittelverlust und Abhilfemassnahme bei einem Batteriestapel mit Flüssigkühlung |
DE202017100531U1 (de) * | 2017-02-01 | 2017-02-16 | Türk & Hillinger GmbH | Rohrwendelpatrone |
DE202020101182U1 (de) * | 2020-03-04 | 2020-03-12 | Türk & Hillinger GmbH | Elektrische Heizvorrichtung |
DE102019127753A1 (de) | 2019-10-15 | 2021-04-15 | Türk + Hillinger GmbH | Verfahren zur Herstellung eines elektrischen Heizelements für elektrische Heizvorrichtungen und/oder Lastwiderstände |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1917256U (de) | 1965-01-30 | 1965-06-03 | Josef Rauh | Skirueckgleitbremse. |
DE102013212205B4 (de) | 2013-06-26 | 2024-02-08 | Türk & Hillinger GmbH | Verfahren zur Herstellung einer elektrischen Heizpatrone |
-
2021
- 2021-02-08 DE DE102021102894.9A patent/DE102021102894A1/de active Pending
-
2022
- 2022-02-07 WO PCT/EP2022/052864 patent/WO2022167649A1/de active Application Filing
- 2022-02-07 EP EP22707645.2A patent/EP4289225A1/de active Pending
- 2022-02-07 US US18/276,268 patent/US20240121861A1/en active Pending
- 2022-02-07 CN CN202280019386.3A patent/CN116918453A/zh active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2853765A (en) * | 1954-08-26 | 1958-09-30 | Wiegand Co Edwin L | Method of making sheathed electric resistance heaters |
DE102013201205A1 (de) | 2012-01-25 | 2013-10-02 | GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) | Detektion von Kühlmittelverlust und Abhilfemassnahme bei einem Batteriestapel mit Flüssigkühlung |
DE202017100531U1 (de) * | 2017-02-01 | 2017-02-16 | Türk & Hillinger GmbH | Rohrwendelpatrone |
DE102019127753A1 (de) | 2019-10-15 | 2021-04-15 | Türk + Hillinger GmbH | Verfahren zur Herstellung eines elektrischen Heizelements für elektrische Heizvorrichtungen und/oder Lastwiderstände |
DE202020101182U1 (de) * | 2020-03-04 | 2020-03-12 | Türk & Hillinger GmbH | Elektrische Heizvorrichtung |
Also Published As
Publication number | Publication date |
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CN116918453A (zh) | 2023-10-20 |
DE102021102894A1 (de) | 2022-08-11 |
US20240121861A1 (en) | 2024-04-11 |
EP4289225A1 (de) | 2023-12-13 |
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