EP3424266A1 - Heating cartridge with a protective tube - Google Patents
Heating cartridge with a protective tubeInfo
- Publication number
- EP3424266A1 EP3424266A1 EP17709928.0A EP17709928A EP3424266A1 EP 3424266 A1 EP3424266 A1 EP 3424266A1 EP 17709928 A EP17709928 A EP 17709928A EP 3424266 A1 EP3424266 A1 EP 3424266A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- protective tube
- spring element
- heating
- heating cartridge
- tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 71
- 230000001681 protective effect Effects 0.000 title claims abstract description 71
- 239000007787 solid Substances 0.000 claims abstract description 7
- 238000005253 cladding Methods 0.000 claims description 54
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 238000007654 immersion Methods 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 229910045601 alloy Inorganic materials 0.000 claims description 6
- 239000000956 alloy Substances 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 5
- 238000007373 indentation Methods 0.000 description 4
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 3
- 239000004202 carbamide Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- DMFGNRRURHSENX-UHFFFAOYSA-N beryllium copper Chemical compound [Be].[Cu] DMFGNRRURHSENX-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000003466 welding 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
- H05B3/48—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material
- H05B3/50—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material heating conductor arranged in metal tubes, the radiating surface having heat-conducting fins
-
- 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
-
- 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
- H05B3/78—Heating arrangements specially adapted for immersion heating
- H05B3/82—Fixedly-mounted immersion heaters
-
- 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
- H05B2203/02—Heaters using heating elements having a positive temperature coefficient
Definitions
- the application relates to a heating cartridge, which is arranged in an outer protective tube.
- Such heating cartridges are required in particular for exhaust gas purification systems (SCR systems), for example for heating tanks containing urea solution, or cartridges containing an ammonia-containing solid or an enzyme, with the aid of ammonia or a urea solution is produced with a desired urea concentration ,
- SCR systems exhaust gas purification systems
- Electric heating cartridges which include a heating element or a PTC element as a heating element.
- the electrical heating elements are introduced into a metallic cladding tube, wherein the cladding tube is sealed at one end, preferably by a metallic bottom, and at the other end, the connections are led out of the tube.
- the connection end can also be sealed, for example by a plastic compound.
- the cladding tube may be, for example, an extruded profile in which ceramic PTC elements are arranged, or a metal tube in which, for example, a heating coil embedded in insulating material is arranged. It is also possible that a thin-walled metal tube surrounds one or more extruded profiles as an additional cladding tube.
- the heat transfer could probably be improved if a good heat conducting material such as magnesium oxide would be filled in the air gap. But then the heating cartridge and the thermowell can not easily take apart again, which is often desired for replacement purposes.
- a good heat conducting material such as magnesium oxide
- the heating cartridge and the thermowell can not easily take apart again, which is often desired for replacement purposes.
- solid storage may contain, for example, ammonia salts.
- the object of the invention is therefore the improved heat transfer from the heating cartridge to the inside of the protective tube, which is in heat-conducting contact with its outside with the medium to be heated.
- the problem is solved by a heating cartridge with a protective tube with the features specified in claim 1. Thereafter, the heat transfer from the heating element, for example, directly from an extruded profile or from a min. An extruded profile surrounding cladding tube to the protective tube via the at least one spring element. The fact that pressure surfaces of the spring element are pressed with a biasing force to the inside of the protective tube, a particularly effective heat transfer is given.
- One spring element in an advantageous development material and / or positively secured to the heating element for example, on the cladding tube, or protective tube.
- one or more heating elements may be arranged in an extruded profile, which can then be regarded as a cladding tube. It is also possible that at least one extruded profile, which may be made of aluminum, for example, surrounded by a comparatively thin-walled cladding, such as stainless steel, and thus can be additionally protected. Furthermore, it is possible for one or more heating resistors, for example a heating coil, to be arranged in an insulator, for example ceramic powder, embedded in a thin-walled cladding tube.
- the spring element preferably also has contact surfaces, which are pressed against the outside of the jacket tube with a biasing force. This ensures good heat transfer from the cladding tube to the spring element.
- the spring element have at least one contact surface on the cladding tube, which is pressed in the installed state by the biasing force of the spring element resiliently against the outside of the cladding tube. It is even a narrow, strip-shaped contact surface by the contact pressure sufficient for a good heat transfer.
- the spring element is configured meander-shaped, with connecting sections in each case the pressure surfaces on both sides connect to the protective tube and to the cladding tube.
- the spring element is configured in a meandering cross-section.
- the distance of the connecting sections increases on both sides of a pressure surface from the middle of the connecting sections to the pressure surface connecting them.
- the at least one spring element is attached to the cladding tube.
- the spring element is attached only at one end to the cladding tube, so that it is movable with its other end relative to the heating cartridge in the longitudinal direction.
- it may be attached along at least one axial line.
- the spring element is held only by clamping, so can move freely relative to the protective tube and the heating element or a cladding tube, for example, to compensate for thermally induced changes in length.
- the spring element is preferably made of metal, for example made of sheet metal. Particularly suitable are aluminum-based alloys and copper-based alloys, for example CuSn6 or beryllium copper.
- the spring element is preferably in one piece. However, multi-part spring elements can increase the heat transfer.
- the at least one spring element protrude starting from the attached to the cladding pressure surfaces rippen- or tab-like connection areas, which pass into pressure surfaces on the protective tube, which are pressed under pretension on the protective tube.
- a spring plate may be slidably pushed onto the cladding tube, which has bent-out tabs whose end portions rest as pressure surfaces under pretension on the protective tube.
- the attachment of the at least one spring element on the cladding tube can be done for example by spot welding or by clamping. In the case of several spring elements, these can also be held in their position by abutting or shape-adapted sections. These sections are preferably located in the region of the pressure surfaces on the cladding tube. Alternatively, it would also be conceivable to attach the at least one spring element to the inside of the protective tube, in which case the rib-like or tab-like connecting regions merge into pressure surfaces on the jacket tube.
- the at least one spring element is reduced in height at at least one end, preferably bevelled. Beveling facilitates the assembly of the heating cartridge, spring element and protective tube. The resulting sharp edges can be crimped or folded. Alternatively, e.g. in the case of a meander-shaped spring element in the end region, the height of the spring element can only be reduced in such a way that it no longer bears under pretension on the cladding tube and / or protective tube. Sharp edges are not so advantageous.
- the immersion heater contains a heating element.
- a heating insert with at least one PTC element can be arranged inside the cladding tube.
- the heater insert may include one or more ceramic PTC elements electrically contacted by a contact sheet.
- a ground contact may be made via a second contact sheet by placing the PTC element (s) are arranged between the two contact plates, or via a heat conducting body.
- the heater insert may additionally include a positioning frame that positions the heating element (s).
- at least one ceramic PTC element with two contact plates is insulated in an opening of a heat conduction body, or is accommodated between heat conduction bodies made of a good heat conducting material such as aluminum.
- the heat-conducting bodies are preferably produced as extruded parts.
- the heating element can be incorporated into a cladding made of stainless steel or aluminum. To a good one
- the heating element or the extruded profile may have at least one indentation on an outer side.
- the cladding tube is contracted around the heating insert or the extruded profile around, whereby an intimate, good heat-transferring contact of heating insert and cladding tube is then given.
- the heating element can also be introduced under bias into the cladding tube.
- the spring element is designed as a corrugated sleeve.
- the waves can follow each other in the circumferential direction or in the longitudinal direction of the sleeve.
- the waves can thus form longitudinal ribs or rings.
- the wave crests form contact surfaces on the protective tube, while the valleys between the shafts form contact surfaces on the extruded profile or the cladding tube.
- the shafts can each be provided with slots.
- the spring element can better fit its circumference to a given thermowell or thermally induced expansions and contractions.
- the waves are provided with slots which terminate before the valleys adjacent to the shaft.
- the wave troughs are preferably designed as pressure surfaces in sections, and thus lie on a defined length in good heat-conducting contact with the heating element.
- the individual waves are preferably the same shape, but may also be shaped differently, for example, have different amplitudes or wavelengths.
- the trough portion has a longitudinal slot. This makes it possible to mount the spring under prestress and thus to achieve an even better heat transfer from the heating cartridge to the spring.
- FIG. 1 shows a longitudinal section of a container with a protective tube
- FIG. 2 shows a cross section through an exemplary embodiment of a heating cartridge according to the invention with a protective tube and a container;
- FIG 3 shows a further embodiment of a heating cartridge according to the invention with spring element, but without protective tube.
- FIG. 4 shows a further embodiment of spring elements of a heating cartridge according to the invention.
- Fig. 5 is a single spring element of the embodiment shown in Fig. 4.
- Fig. 1 shows schematically the longitudinal section through a container 1 with a medium to be heated, for example, the solid cartridge of a reducing agent system.
- a protective tube 2 is attached fluid-tight.
- a heating element 3 is introduced.
- an air gap 4 Between the protective tube 2 and the heating element 3 is an air gap 4.
- a spring element 6 (shown schematically) is arranged.
- the spring element 6 is a corrugated sleeve, wherein the waves are formed as elevations 6.1, which in Um- follow each other. The valleys 6.2 between the waves thus extend in the longitudinal direction of the heating element.
- the spring element 6 is chamfered such that the outer diameter of the spring element is smaller than the diameter of the protective tube inside at this point. While in this illustration, the heating cartridge 3 is fixedly connected to a bottom part 5, the container 1 is removable. In the case of a solid cartridge this is removable from the vehicle and thereby rechargeable or exchangeable.
- Fig. 2 shows a cross section through the container 1 with protective tube 2 and immersion heater 3, which has a cladding tube 7 on its outer side.
- a spring element 6 is arranged in the air gap 4 between the protective tube 2 and cladding tube 7.
- This spring element is made of metal, for example an aluminum-based alloy or a copper-based alloy, and is designed to be integrally closed here. But also conceivable are several individual segments or versions with a longitudinal slot.
- the spring element 6 has in this embodiment a meandering shape with pressure surfaces 6.1 on the inside of the protective tube 2 and pressure surfaces 6.2 on the outside of the cladding tube 7.
- the pressure surfaces 6.1, 6.2 are connected to each other by connecting sections 6.3.
- the middle of the connecting sections 6.4 is indicated on the left half of the drawing.
- the spring element 6 can advantageously adapt well to the air gap width, and overall pressure surfaces on the cladding tube 7 and protective tube 2 which are larger than the respective outer and inner surfaces of Hüllg. Protective tube, which causes a particularly good thermal coupling of the tubes on the spring element 6.
- a bathleitprofil 8 is arranged, for example, an extruded profile of aluminum or another metal.
- a ceramic PTC element 9 with two contact plates 10 is insulated by an insulating 1 1 in an opening 12 of the bathleitprofiles 8 added.
- the PTC Element 9 or the PTC elements can be held by a positioning frame, which can additionally hold one or both contact plates 10.
- the heat conduction 8 On its outer side, the heat conduction 8 has two indentations 8.1. Formed by corresponding indentations 7.1 on the cladding tube, the cladding tube 7 is contracted around the heat conduction 8 around, whereby an intimate, good heat transfer contact of sautprofil 8 and cladding tube 7 is given.
- the protective tube 2 and the heating element 3 are made approximately round.
- the air gap 4 at different locations may also be different widths.
- Fig. 3 shows a further embodiment of a heating cartridge with a spring element 6.
- the heating element 3 has a heating insert with aticianleitprofil 8, for example, an extruded profile of aluminum or another metal, in the one or two contact plates 10 and one or more ceramic PTC elements 9 are used on one or two sides isolated.
- the one or more PTC elements 9 may be held by a positioning frame 22.
- the heat conduction 8 is not surrounded by a separate cladding in this embodiment.
- Theticianleitprofil 8 thus forms a cladding tube of the heating element.
- a separate cladding tube can be added as in the above embodiment.
- the end of theticianleitprofils 8 may be sealed, for example by means of a plastic cap, not shown.
- the spring element 6 is formed in the embodiment shown in FIG. 3 as a corrugated sleeve, for example as a corrugated tube.
- the waves are not formed as elevations, which follow one another in the circumferential direction. Instead, the waves are formed as elevations, which follow one another in the longitudinal direction.
- Each of the waves forms a pressure surface 6.1 for the protective tube and surrounds in the embodiment shown in Fig. 3, the heat conduction 8 annular.
- the spring element 6 may have a continuous longitudinal slot 20.
- a longitudinal slot 20 makes it easier to arrange the spring element 6 around the réelleleitprofil 8 around.
- the longitudinal slot 20 facilitates adaptation to thermally induced changes in length or the insertion into a protective tube, so that the sections between the shafts, so the pressure surfaces 6.2 always keep good thermal contact with the heat conduction 8 and 8, a cladding.
- the spring element is extremely preferably applied under pretension on the cladding tube.
- the radius of the pressure surfaces in the relaxed state may be smaller than the cladding tube radius.
- the elevations which form the pressure surfaces 6.1 for the thermowell, not shown in Fig. 3, each have a plurality of slots 21. These slots 21 terminate before the survey each adjacent trough, ie before the pressure surfaces 6.2.
- the slots 21 divide the elevations and thus also the pressure surfaces 6.1 in several strips, which are oriented in the longitudinal direction of the heating element. The slots 21 thus facilitate the compressibility of the spring element 6 without impairing the thermal contact with the heat-conducting profile 8 or the cladding tube.
- the spring element 6 is preferably attached to the heat-conducting profile 8 or the cladding tube at a single end. In this way, the pressure surfaces 6.2 can shift in the longitudinal direction, so that the spring element can adapt to thermally induced changes in length or change its length when introduced into a protective tube.
- FIG. 4 shows a possibility of how the spring element 6 of the exemplary embodiment shown in FIG. 3 can be replaced by a plurality of spring elements 66. These spring elements 66 are inserted into each other in the axial direction.
- FIG. 5 shows one of the spring elements 66 shown in FIG. 4 in a single view.
- the spring element 66 has an annular base portion, from which resilient spring see go out, which are each attached at one end to the base portion and are free at the other end. When installed, these free ends then lie under pretension on the protective tube. For better assembly, the outermost regions of the free ends can be reduced in their axial height, for example curved away from the protective tube or rolled up.
- the base portion may be formed as a slotted ring and form a pressure surface 6.2 as described above.
Landscapes
- Resistance Heating (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102016002569 | 2016-03-04 | ||
DE102016111258.5A DE102016111258A1 (en) | 2016-03-04 | 2016-06-20 | Heating cartridge with a protective tube |
PCT/EP2017/054760 WO2017149008A1 (en) | 2016-03-04 | 2017-03-01 | Heating cartridge with a protective tube |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3424266A1 true EP3424266A1 (en) | 2019-01-09 |
EP3424266B1 EP3424266B1 (en) | 2021-01-20 |
Family
ID=59650616
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17709928.0A Active EP3424266B1 (en) | 2016-03-04 | 2017-03-01 | Heating cartridge with a protective tube |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3424266B1 (en) |
DE (1) | DE102016111258A1 (en) |
WO (1) | WO2017149008A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202017006480U1 (en) | 2017-12-18 | 2019-03-19 | I.G. Bauerhin Gmbh | Heating device for heating liquids in a reservoir, such as a tank or a container of a vehicle |
DE102017011686A1 (en) | 2017-12-18 | 2019-06-19 | I.G. Bauerhin Gmbh | Heating device for heating liquids in a reservoir, such as a tank or a container of a vehicle |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE431887C (en) * | 1925-08-02 | 1926-07-22 | Alfred Klotz | Electric panel heating element with metal cladding |
DE1006601B (en) * | 1953-02-23 | 1957-04-18 | Metallwarenfabrik Maybaum | Tubular heater |
NL7504083A (en) * | 1975-04-07 | 1976-10-11 | Philips Nv | SELF-REGULATING HEATING ELEMENT. |
GB2143708B (en) * | 1983-06-23 | 1986-12-17 | Tokai Electric Wire | Heating device for heating an air-fuel mixture to be supplied to an internal combustion engine |
JPH10220909A (en) * | 1996-12-03 | 1998-08-21 | Komatsu Ltd | Fluid temperature control device |
FR2803370B3 (en) * | 1999-12-29 | 2001-12-21 | Chia Hsiung Wu | PROTECTIVE ENCLOSURE HEATING APPARATUS |
DE10247509A1 (en) * | 2002-10-11 | 2004-04-22 | Hotset Heizpatronen U. Zubehör Gmbh | Device for heating cylindrical parts |
-
2016
- 2016-06-20 DE DE102016111258.5A patent/DE102016111258A1/en not_active Withdrawn
-
2017
- 2017-03-01 WO PCT/EP2017/054760 patent/WO2017149008A1/en active Application Filing
- 2017-03-01 EP EP17709928.0A patent/EP3424266B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP3424266B1 (en) | 2021-01-20 |
DE102016111258A1 (en) | 2017-09-07 |
WO2017149008A1 (en) | 2017-09-08 |
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