DE112004001022T5 - Manufacturing method for an electric heating module using a template and the electric heating module - Google Patents

Abstract

method for producing an electric heating device for cleaning of exhaust gases of a vehicle with the step of laminating strips to form a heating cable, the strips being laminated in a stencil in which a Heizleitungenseinsetzschlitz a predetermined Form is formed.

Description

Background of the invention

1. Field of the invention

The The present invention relates to a process for the preparation of a electric heater using a template and an electric heater made by this method becomes. More particularly, the present invention relates to a method for Production of an electric heating device with the steps a wavy strip and a flat strip, respectively from a thin one Metal plate consist of laminating to form a heating cable and a paste-like filler metal or a paper sheet-like solder foil to apply to the heating line and to solder in a vacuum oven, wherein a template is used to form a predetermined shape of the heating cable maintain, as well as an electric heater, the at the same time outstanding mechanical strength at one Connecting section between the sheaths and the heating cable a free change the resistivity of the sheath allowed and an excellent Has isolation property.

2. Description of the state of the technique

There an internal combustion engine for a vehicle is generally a large amount of harmful Exhaust fumes, because a fuel is burned, a catalyst is used around the amount of harmful To reduce exhaust gas.

Of the Catalyst becomes common on a ceramic-based carrier coated and serves to harm the harmful exhaust gas into harmless carbon dioxide or to convert like. However, the ceramic-based carrier is susceptible to thermal stress caused by the exothermic reaction which is associated with the activation of the catalyst, and as well on oxidation and shocks of the Vehicle. Furthermore Often a physical or chemical damage occurs in the ceramic-based carrier on, for example, poisoning by sulfur compounds or the like contained in the fuel.

Around to solve these problems was in place of the carrier made of ceramics (mainly Codierit), which for the use as a catalyst is coated with a noble metal, a metal carrier proposed, which is coated with a catalyst. The metal carrier will made by alternately a wavy strip and a flat Strips are laminated, each made of a thin metal plate made of laminated metal strips, a paste-like filler or a paper sheet-like solder foil is applied to the tortuous metal strip to a binding force to increase between these and the metal strips are soldered in a vacuum oven.

The Metal strips are joined together by the flat / corrugated ones Be soldered strips previously wound as an integral component and inserted into a sleeve. Like the conventional ceramic carrier, the one produced by soldering metal support formed with tiny cell structures and can be used after being coated with the catalyst.

Also if the metal carrier essentially a similar one Structure like the ceramic carrier has, in comparison to the conventional ceramic carrier has a very strong thermal and mechanical durability. Accordingly, the metal carrier was preferably used on vehicles two wheels applied, the exhaust gases of very high temperature and high flow rate produce.

According to one newer trend of tightening of policies to reduce exhaust emissions Especially in the case of a gasoline engine, a method in which the three-way catalyst is arranged adjacent to the engine to the amount of unburned Hydrocarbons to reduce during a cold start or idling the engine are ejected. Alternatively exists a method based on an electric heater the principle of the metal carrier used, which activates the catalyst in a short period of time, by heating the electric heater during cold start becomes.

in the Trap of a diesel engine is now a diesel particulate filter used to reduce the smoke of the diesel engine. Regarding one for the Diesel particulate filter available Technology, there is the technology of trapping smoke using a ceramic filter and a periodic regeneration technology Oxidizing and burning the trapped smoke. Recently it has been the electric heater with the metal carrier for the regeneration technology used.

Here, the regeneration technology electric heater generally has a plurality of layers of thin plates which are laminated on each other and used in the production of the metal carrier as described above. Meanwhile, corrugated strips of different cell sizes are alternately laminated and bonded to each other in the electric heater with the metal carrier. Accordingly, the wavy stripes form an uneven verb surface, which leads to a deterioration of the bonding force after soldering. In addition, it is difficult to apply the above-mentioned method in practice, not only because of the difficulty in winding the heating line with the strips laminated to each other, but also because of the unevenness of the resistivity, structure and electrical properties of the heating line.

Of the inconsistent specific resistance of the heating pipe causes to one side of the heating cable compared to the other side a relatively large one Amount of electricity is administered, resulting in a non-uniform temperature in the heating pipe or a local increase in temperature in the Heating cable leads. This makes the thermal durability in a particular Section of the heating pipe reduced.

considered the function of the existing electrode and the sheath of the electric heater, the electrode now connects the internal heating cable with a power supply. Accordingly it must be sufficiently isolated from the environment and a good one have thermal / mechanical durability. Because the sheath Furthermore the current flow between the heating cable and the mass of the surrounding Power source allows must also have sufficient thermal and mechanical durability guaranteed become.

The Structure of the electrode of the conventional electric heater is compared with a case where a ceramic material as an insulating material used, vulnerable on bumps or Shocks. Since the electrode is connected to the internal sheath, lies Furthermore the unpleasant situation that the entire electric heater must be replaced by a new, even if only the electrode damaged or is broken. The sheath serves to supply the power between the heating cable and the outside environment and is connected to the heating line by means of soldering.

There a connection surface between the flat sheathing and the corrugated strips of the heating cable is not uniform, has the conventional electric heater in this regard very weak mechanical and thermal structure and does not allow any free change the resistivity of the sheathing according to the amount of electricity in the heating pipe.

In a case where the heater and the heat radiation prevention device or the metal carrier as described above and an insulating pin in one last stage of assembly for the purpose of electrical insulation the units is mounted, maintaining the mechanical strength to be kicked as well the problems on that the insulating pin the assembly and the Manufacturing process of the electric heater is difficult and that the manufacturing costs increase, even if the manufacturing process is commercialized.

Summary the invention

The The present invention is intended to solve the above-mentioned problems, and It is an object of the present invention to provide a method for To create an electric heater that having the step of taking the form of a heating line using maintain a template, thereby reducing of the yield due to the change the length and to prevent the shape of the heating cable caused by the soldering becomes.

It Another object of the present invention is to provide an electrical Heating device to create a free change of resistivity a sheath allowed and at the same time at a connecting section between the shell and the heating pipe an outstanding mechanical Strength, an excellent heat radiation shield and provides a superior insulating property.

According to one Aspect of the present invention, the above-mentioned and Other goals are achieved by a method of manufacture an electric heater for purifying exhaust gases of a Vehicle is provided, which has the step to strip Laminate to form a heating cable, with the strips in a stencil with a heating line insertion slot formed therein of a predetermined one Form are laminated.

The Stencil can be made of metal or a ceramic material. The Stencil can as well at least one sheath insertion slot to a sheath to supply the heating cable with electricity. In addition, can the template on an edge of the wall of the Heizleitungseinsetzschlitzes or at one edge of the wall of the sheath insertion slot a bevel be equipped.

According to another aspect of the present invention, there is provided an electric heater for purifying exhaust gases of a vehicle having inner and outer shells that divide the electric heater into inner and outer portions and with current from electrodes provide a heating line with strips laminated to each other, which is configured such that the heating line can be arranged separately on inner and outer portions of the electric heater and that the strips of heating cable are connected to the inner and outer sheath, and a heat radiation shield, the is integrally attached to an arrangement of the sheaths and the heating line, wherein each of the shells is divided into at least two parts.

The Heating cable can be at one end of the heating cable flat shaped strips a predetermined length having, with the sheaths by means of a fastener are connected. The strips of heating cable can be at different heights of Jackets connected to the sheaths to be an influence between the electrode and the heating cable to eliminate and one special surface area widen the sheathing. Each electrode can be an electrode rod having a head bolt at one end, to be attached to the shell; a ceramic layer, surrounding the electrode rod at a portion of the electrode rod, and an electrode ring disposed around the electrode rod, so that the electrode ring can surround the ceramic layer. The Jackets and strips of heating cable can be soldered together be attached. Furthermore can the sheathing and the strips of the heating pipe to each other by means of a Base socket attached to a predetermined section the heating line is arranged, as well as a base element, the introduced the socket socket while touching the sheathing. The sheaths and the strips of heating cable can be attached to each other by means of a fixing pin. The Thermal radiation shield is on the arrangement of the heating pipe and the sheathing below Using a Isolierstiftbaugruppe attached so that the heat radiation shield is electrically isolated from the heating cable and the sheaths.

The Sheath of an anode of the electrode may have a length, which is lower than that of the sheath of a cathode of the electrode. The electrode rod is on an outer periphery the electrode rod equipped with at least one recess, where the electrode ring is attached. The insulating pin assembly may comprise a ceramic element with a through hole as well an insulating pin inserted into the through hole of the ceramic element introduced is. The insulating pin can in the Isolierstiftanordnung in two Parts should be divided, leaving a predetermined gap between provided the two parts of the insulating pin in the ceramic element is.

Short description of drawings

The mentioned above and other objects, features and advantages of the present invention more clearly from the following detailed description with the accompanying drawings.

1 Fig. 12 is a view showing a heating pipe and a stencil for the divided electric heater according to an embodiment of the present invention, which are separated from each other;

2 Fig. 13 is a view showing the heating pipe for the divided electric heater according to the embodiment of the present invention inserted in the stencil;

3 is an enlarged view of a portion of the template;

4 is an enlarged view of a section of the heating line 1 ;

5 Fig. 12 is a view showing a heating pipe for a one-piece electric heating pipe inserted in a stencil of another embodiment of the present invention;

6 Fig. 12 is a view showing a heating pipe inserted in a stencil in a case of a divided electric heater according to another embodiment of the present invention;

7 is an enlarged view showing a section "C" 6 represents;

8th is an enlarged view showing a section "D" off 7 represents;

9 Fig. 13 is a view showing the end of the heating pipe and the casing which are connected to each other;

10 Fig. 11 is a view showing an inner shell and an outer shell in an assembled state;

11 Fig. 10 is a perspective view of an electrode rod according to the present invention;

12 Fig. 12 is a view of a first embodiment of an electrode in which the electrode rod and an electrode ring are fixed to each other;

13 is a cross-sectional view of the electrode 12 ;

14 Fig. 12 is a cross-sectional view of a second embodiment of an electrode according to the present invention;

15 Fig. 13 is a view illustrating a state in which the heating wire and an arrangement of the sheaths and the electrode are separated from each other;

16 Fig. 16 is a view showing the laminated heating pipe, the sheaths and the electrode in an assembled state;

17 Fig. 13 is a view showing fixing pins for connecting the inner and outer shells to the heating pipe;

18 Fig. 13 is a view showing a state in which the inner and outer sheaths are connected to the heating line by means of the fixing pins;

19 Fig. 10 is a perspective view of a socket member and a socket socket;

20 Fig. 12 is a view showing the base member and the socket socket connecting the jacket and the heating wire in an assembled state;

21 Fig. 12 is a view showing a first embodiment of an insulating pin assembly according to the present invention;

22 Fig. 10 is a view showing a second embodiment of an insulating pin assembly according to the present invention;

23 Fig. 12 is a view showing a third embodiment of an insulating pin assembly according to the present invention;

24 Fig. 12 is a view showing a fourth embodiment of an insulating pin assembly according to the present invention;

26 Fig. 12 is a view showing a sixth embodiment of an insulating pin assembly according to the present invention;

27 Fig. 12 is a view showing an electric heater assembly and a heat radiation prevention film in a separated state;

28 Fig. 12 is a view showing the electric heater assembly and the thermal radiation preventing film in an assembled state;

29 Fig. 12 is a view showing the electric heater and an outer sleeve in a separated state; and

30 FIG. 12 is a view showing the electric heater and the outer sleeve in an assembled state. FIG.

detailed Description of the Preferred Embodiments

Now Preferred embodiments will be detailed described with reference to the accompanying drawings, so that a person skilled in the art will easily understand the present invention and can repeat.

The electric heater for Vehicles according to the present Invention is on a device used for cleaning exhaust gases. The electric heater according to the present invention is made by a process comprising the steps of to laminate a wavy strip and a flat strip, each made of a thin one Metal plate to make a heating cable, a paste-like filler or a paper sheet-like solder foil Apply to the heating cable, a heat radiation shield on to attach the heating cable and the heating cable in a vacuum oven to solder.

For a subdivided Electric heater is the heater in at least divided into two sections, for example, an inner Heizvorrichtungsabschnitt and an outer heater section, and thus can the heat capacities of the inner and outer heater section independently to be controlled. Specifically, the divided electric heater by means of sheaths in the inner heater section and the outer heater section subdivided using electrodes and the sheaths, to supply the heating cable with electricity and a current through the heating cable flow allow.

The Number of electrodes and sheaths will be according to the number the divided sections of the electric heater provided. The electrodes and the sheathing are with the heating cable and connected to an outer sleeve and serve to increase the overall mechanical / thermal strength of the increase electrical heater.

A method of manufacturing the electric heater described above will be described in detail below. The method of manufacturing the electric heater includes the steps of alternating a flat strip and laminating a corrugated strip or laminating strips alternately corrugated to form a heating line of a desired shape using the laminated strips, connecting sheaths and electrodes to the strips of the heating line of the desired shape, connecting means to an assembly apply the heating cable and the sheathing, attach a heat radiation shield to the arrangement of the heating cable and the sheaths and to solder the arrangement of the heating cable and sheaths assembled with the heat radiation shield.

At the Step of forming the heating pipe of the desired shape using In the meantime, it is difficult for the laminated strip Heating cable of the desired Form form while maintaining spaces between the strips. Accordingly, the present invention uses a template, that with a Heizleitungseinsetzschlitz a predetermined shape Is provided.

There the template is to be used repeatedly, the template exists preferably made of metal or a ceramic material.

In In a case where the template is made of metal, the template can be coated with the ceramic material to prevent the Sheathing and the template or the heating cable and the template be connected to each other.

The Stencil is equipped with at least one sheath insertion slot, where the sheaths are to be attached, the electric be connected to the heating cable to the power supply too guarantee. Furthermore The template can be chamfered on one edge of a wall the Heizleitungseinsetzschlitzes or an edge of a wall of the Sheath insertion slot be equipped.

Of the Sheath insertion slot is thus formed in the template, the sheath insertion slot is immediately adjacent to the outer surface of the sheath Strip the heating cable can be arranged and the sheathing in the sheath insertion slot can be arranged to a to ensure light adhesion to the strips.

At the Forming the heating pipe of the desired shape using the template into which the strips or sheaths are inserted, exists as well the mischief in the operation that the strips or the sheathing with the edge of the wall of Heizleitungenseinsetzschlitzes or Edge of the wall of the sheath insertion slot can. Accordingly, the heating pipe insertion slot or the sheath insertion slot is preferably with a bevel equipped on the edge of his wall.

In a case where the electric heater through the above is described in each method, is in each jacket divided at least two parts.

The Sheath of an anode of the electrode has a length, which is less than the length of the Sheath of a cathode of the electrode.

The Heating cable has flat shaped strips of a predetermined Length at End of the heating pipe, with a fastener to the sheathing are attached. Meanwhile, in the conventional electric Heater the strips of heating cable with the sheathing connected in a corrugated state of the end of the heating line, which after frequent Operation of the electric heater to a decrease in the fastening force between the sheathing and the strip of heating cable leads.

If According to the heating line Made with the strips, the strips are at their ends not corrugated, leaving flat-shaped strips at the end of the heating pipe be formed, which connected with the sheaths in an attempt be the fastening force between the casing and the strips to increase the heating line. This will fix between the shell and the strips the heating cable is easy and safe, which prevents it the fastened strips of the heating cable and the sheathing the vibrations of the vehicle relaxed or released become.

The Electrodes are connected to the sheathing to the power supply to ensure. Each of the electrodes has an electrode rod which is connected to a End is provided with a headed bolt, which is attached to the sheath should be, and an electrode ring around the outer circumference attached to the electrode rod around.

Of the Electrode rod is connected to the sheath and serves to connect the heater and the power supply to each other. The electrode rod is needed around the heating cable from the ground of the power supply of the motor to insulate electrically, and must have an excellent thermal Characteristic, since repeated heat acts on him.

The electrode rod has a ceramic layer on a portion of the electrode rod and is provided with a recess on the outer surface of the electrode rod, in which the electrode ring is fixed and the ceramic layer is provided, whereby improved thermal and electrical properties of the electrode ring are achieved.

Around the contact resistance between the sheaths and the heating cable To reduce the cladding in their surface areas downsized and structured so that a connecting section between the sheaths and the electrode can be freely varied. In addition, will a structural change the sheathing, accompanied by changes in the capacity of the electric Heating device, achieved by the height of the shells varies becomes.

In addition, will the strips of heating cable at different heights of the Sheaths connected to the sheathing to a special surface area to widen, by the influence between the electrode and the heating cable is eliminated. This allows the number of heating cables, the per unit area are wound, further increased become. Furthermore are the sheathing and the strips of the heating pipe together by means of soldering, a pedestal element or a fixing pin attached.

The Soldering will performed in a vacuum oven, with a solder filler on the arrangement of the sheath and the heating cable is applied.

Besides that is it is possible to fasten the sheaths and the strips of heating cable together by using a socket socket which is at a predetermined position Section of the heating cable is arranged, as well as a base element, which is fitted into the base socket and at the same time the sheath touched.

The Thermal radiation shield is on the arrangement of the heating pipe and the shrouds below Use an insulating pin assembly attached. The insulating pin assembly has a ceramic element with a typical through hole and a Insulating pin, which is in the through hole of the ceramic element introduced is. The insulating pin is divided into two parts, so that one predetermined gap is provided between the two parts in the ceramic element.

The Insulating pin assembly is between the heat radiation shield and the sheathing arranged to the mechanical strength between maintain these two components and the heat radiation shield and isolate the sheathing from each other. The insulating pin assembly is intended to maintain the entire shape of the thermal radiation shield and is made of metal and a ceramic material. In addition to the task of maintaining the mechanical strength between These two components, the Isolierstiftbaugruppe according to the present Invention also serve the spaces between the components maintain.

A embodiment The present invention will hereinafter be described in detail with reference to FIG described on the drawings.

1 shows a heating line for an internal heater 1 and an external heater 2 as well as a template 10 according to an embodiment of the present invention, which can be used in the manufacture of a divided electric heater.

As by the circles A and B in 1 That is, the heating line according to this embodiment may have a structure in which one or more stripes having different cell densities are laminated in the heating line, or a structure in which one or more stripes are laminated at a predetermined period.

The template 10 According to the present embodiment, with a Heizleitungseinsetzschlitz, an inner sheath insertion slot 4 and an outer sheath insertion slot 3 be equipped so that the sheaths and electrodes can be assembled integrally.

In addition, the template may include a maintenance section 5 be fitted to a gap between the inner sheath insertion slot 4 and the outer sheath insertion slot 3 to prevent portions of the heating pipe from being shortened after the practical fixing of the electric heater to the engine.

2 FIG. 14 is a view showing the heating line of the electric heater inserted into the template. FIG.

3 is a partially enlarged view of the template 10 , As in 3 the template is shown at an upper edge of a wall of the Heizleitungenseinsetzschlitzes or at an upper edge of a wall of the Ummantelungseinsetzschlitzes with a chamfer 6 equipped with a predetermined angle. The bevel is intended for easy insertion of the heating cable.

4 FIG. 10 is an enlarged partial view of the heating line showing an example of a method of laminating the strips used in the present invention Invention can be used.

Strips with different cell densities can be used for the strips of heating cable, as well as strips with different oscillations and strips with different periods of corrugation. Specifically, in the case where the heating line is formed by laminating the strips having different cell densities, a method is used as the method for laminating the strips alternately having a corrugated strip 11 low cell density and a corrugated strip 12 high cell density is laminated, and in the case where the heating line is formed by laminating strips having different periods, as a method of laminating the strips, a method is used in which strips of identical shape are laminated so that a corrugated portion of the a strip can be placed on a flat portion of another strip. For the heating cables are each different types of metallic contact section 13 intended.

5 Fig. 13 is a view showing a heating pipe for a unitary electric heater in an assembled state inserted into a stencil according to another embodiment of the present invention. In the case of the one-piece electric heater, the manufacturing process is similar to that for the divided electric heater except for the number of shells.

6 FIG. 14 is a view showing a heating duct for a divided electric heater in an assembled state inserted into a stencil according to another embodiment of the present invention. FIG. 7 is an enlarged view showing a section "C" 6 represents, 8th is an enlarged view showing a section "D" off 7 represents, and 9 FIG. 13 is a view showing the outer end of the heating pipe and a jacket of an outer heater connected to each other.

In general, the heating cable is the corrugated strip 11 and 12 directly connected to the sheathing. According to the invention, according to which the heating cable at its end with the flat-shaped strip 14 is equipped, the heating cable is at its end via a bolt 27 connected to the sheath.

10 Fig. 12 is a view showing the inner and outer sheaths of the present invention. The inner sheath in the central portion is in an inner sheath anode 20 and an inner sheath cathode 20 divided and in the case of the divided electric heater, the anode part is smaller than the cathode part. The inner sheath anode 20 is provided with a portion into which an electrode connected to the power supply can be inserted, and the inner cladding cathode 21 is provided with a section to be connected to the heating cable.

The outer sheath 22 has one or more sheaths, each of which is connected to the electrodes.

11 to 14 FIG. 12 are views of an electrode rod used in the present embodiment. FIG. As in 11 shown is the electrode rod with recesses 31 provided where a ceramic layer 33 the electrode rod 30 as in 12 shown, thereby causing an increase in the thermal and electrical properties derived from the ceramic material, and is also at a portion which is to be connected to the sheath, with a head bolt 32 equipped, whereby the contact resistance between the sheath and the electrode rod is minimized.

As in 12 the electrode rod is shown 30 on the insulating ceramic layer 33 , which surrounds the electrode rod, with an electrode ring 36 equipped to connect the sheath with an outer sleeve. The inner electrode rod 30 serves to allow current to flow through while the outer electrode ring 36 serves to connect the sheath with the outer sleeve. The ceramic layer between these two metal elements serves to the electrode rod 30 and the electrode ring 36 isolate each other.

13 is a cross-sectional view of the electrode rod 12 , 14 FIG. 10 is a cross-sectional view of an electrode rod according to another embodiment of the present invention, in which an insulating ceramic layer. FIG 33 is extended to a portion which is fastened to or assembled with the shroud for interruption of the insulation during a composition process or process of attachment.

15 and 16 FIG. 14 is views showing the components of the electric heater of the present invention in an assembled state, respectively according to the methods of FIG 1 to 14 , If the sheaths 20 . 21 and 22 at the template 10 It is necessary that the sheathing be fastened 20 . 21 and 22 always at a constant point of the template with the template 10 are connected. As in 10 For this purpose, the inner and outer sheaths or the inner sheaths are first represented 20 and 21 provided and the Elek trodenstab, as in 12 is shown with the sheath by an electrical connection or by the bolt 32 connected.

Specifically, the electrode is connected to the inner shell such that the inner shell is electrically connected to the outer shell 22 can be isolated.

Besides, they are the electrode rod and the connecting portion of the heating line and the sheaths arranged at different locations, thereby the special surface area the sheath increased is and a width of the heating line without much change in the jacket free is set.

17 and 18 are views showing a method for fixing the heating pipe and the jackets. An inner portion of the heating conduit disposed within the inner shell becomes in such a manner with the inner sheaths 20 and 21 Connected to the heating pipe after being directly connected to the inner sheaths 20 and 21 By soldering with the inner Ummante lungs 20 and 21 is connected. An outer portion thereof, which is disposed between the inner and the outer sheath, becomes with the inner and outer sheath by a plurality of fastening pins 15 connected. Here connect the mounting pins 15 the inner sheath and the outer portion of the heating cable and the outer sheath and the outer portion of the heating cable.

As in 19 and 20 As an example of using the method of connecting the sheaths and the heating line, in the case where the heating line has to be replaced with a new one because the heating line has been broken, a base member may be shown for connection between the heating line and the shells 40 and a socket socket 41 be used. Here is the base element 40 through the base socket 41 held.

Around to allow the use of the socket element is the socket element structured so that there is a contact resistance between the base element and sheathing minimized, most of all under consideration the metallic properties of the base element and the sheath.

After assembling the sheaths and the heating line, a thermal radiation preventing film is formed 73 attached to the arrangement. In this case, it should be ensured that the heat radiation prevention film 73 has sufficient mechanical strength and that the heat radiation prevention film 73 and the heating cable are electrically isolated from each other.

21 to 26 show embodiments of a Isolierstiftbaugruppe, which is used in the context of the present invention.

In 21 are hexagonal insulating pins 62 with a rectangular cross-section in a cylindrical ceramic element 60 introduced. In 22 cylindrical insulating pins are inserted into a cylindrical ceramic element.

These two insulating assemblies have a structure in which two insulator pins are inserted into a cylindrical ceramic member with a predetermined gap 64 from 2 to 3 mm is provided between them. Considering the bonding strength between the ceramic material of the ceramic member and the metal of the insulating pin, the hexahedral insulating pin is preferable to the cylindrical insulating pin. However, in terms of ease of manufacture, the cylindrical insulating pin is more advantageous than the hexahedral insulating pin. Accordingly, the insulating pin assembly can be suitably manufactured according to the environment of use.

In 23 cylindrical insulating pins are inserted in a hexagonal ceramic element. In 24 become placeholder plates 69 used to increase the bond strength. 25 shows a placeholder 70 a predetermined size, which is inserted in the Isolierstiftbaugruppe to maintain the gap between the insulating pins during the process of forming the Isolierstiftbaugruppe safer and faster. 26 shows an example of a ceramic element 72 with staggered geometry that can be used in the case where the insulator pin assembly is structurally unrestricted in size and at the same time the bond strength is increased. In this case, since many metal pins are inserted into the ceramic element, there is an advantageous effect of increasing its strength.

In In the present invention, these Isolierstiftbaugruppen on appropriate way under consideration of application, price and restrictions used.

27 and 28 show a method of using the Isolierstiftbaugruppe for the heat radiation shield 73 , Before the heat radiation shield 73 is formed, first, a minimum number of Isolierstiftbaugruppen at points of the insulating pin in the heat radiation shield in the heat radiation shield 73 inserted, whereby a mechanical strength of the electric heater are maintained can.

The insulating pin assemblies are inserted into the thermal radiation shield using an introducer in accordance with the positions and number of insulating pin assemblies 73 introduced. The heat radiation shield 73 is fixed together with the Isolierstiftbaugruppen to the assembled arrangement of heating and cladding, wherein a predetermined force is applied, which acts cautiously from the outside on the heating cable. The fastening operation must be performed so that the thermal radiation shield can be fixed while remaining at right angles to the sheaths.

29 and 30 show the electric heater according to the present invention in a fully assembled state. Here is a sleeve 100 for the electric heater connected to the heater, so that the total mechanical strength of the electric heater can be maintained.

The The present invention is directed to deterioration the thermal durability the heating line itself due to local differences in specific Resistance caused by a structural inconsistency in training and winds the conventional ones corrugated heating cable for caused the electric heater using the metal carrier be eliminated. According to the invention, the above problems can be solved by the method for producing the heating line using the Stencil of metal or ceramic material to be detached, different from the conventional winding method for forming the corrugated heating line different.

As is apparent from the above description, according to the invention, the sheath attached to the template, and the template exerts one after soldering predetermined force on the sheaths, so that the operation Connecting the heating line and the sheaths are easily performed can. Because the sheath has a structure that is light in size changed can be, as well the contact resistance between the heating cable and the sheathing can be reduced, causing the loss of electrical Energy considerably is reduced.

There additionally for soldering for the direct connection of the sheaths with the heating cable or the Heating cable with the heating cable the base element is used can provide a thermally and mechanically excellent durability be ensured.

In addition, will the electrode according to the invention in their structure at the contact portion between the ceramic material and the metal improves, and the ceramic material on the electrode rod is arranged at a predetermined distance from each other in the grooves, which are formed in the electrode rod, resulting in remarkable Way prevents the electrode rod due to a thermal Expansion between the ceramic material and the metal breaks. In addition, can the insulating pin assembly in accordance with a variety of applications different embodiments own, and she becomes in her structural and electrical characteristics sufficiently improved, resulting in excellent durability is obtained.

It it should be clear that the embodiments and the accompanying drawings, as described above, for illustrative purposes only and the present Invention is limited by the following claims. An expert will Furthermore notice that various modifications, additions and substitutions possible are without departing from the scope of the invention as defined by the appended claims is to deviate.

Summary

The present invention relates to a method of manufacturing an electric heater comprising the steps of laminating a corrugated strip and a flat strip both consisting of a thin metal plate to form a heating line, applying a filler metal or a sheet-like solder foil to the heating line, and in a vacuum furnace, using a template to maintain a predetermined shape of the heating line, and an electric heater which, while maintaining excellent mechanical strength at a junction between the shells and the heating line, undergoes a free change in resistivity Envelopes as well as provides an excellent insulation property. The present invention provides a method of manufacturing an electric heater for purifying exhaust gases of a vehicle, comprising the step of laminating strips to form a heating line, the strips being laminated in a stencil in which a heating line insertion slot of a predetermined shape is formed. The present invention also provides an electric heater for purifying exhaust gases of a vehicle having inner and outer shells which divide the electric heater into inner and outer portions and of Electrodes may be supplied with power, a heating line with strips laminated to each other, wherein the heating line may be arranged separately on the inner and the outer portion of the electric heater and the strips of the heating line are connected to the inner and outer sheath, and with a heat radiation shield, which is integrally fixed to an arrangement of the sheaths and the heating line, each sheath being divided into at least two parts and the heating line having at the end of the heating line, which is connected by means of a fastening means with the sheaths, a flat shaped surface of a predetermined length.

Claims (15)

Method for producing an electrical heating device for cleaning exhaust gases of a vehicle with the step, strip to laminate to form a heating cable, with the strips in a stencil in which a Heizleitungenseinsetzschlitz a predetermined shape is formed. The method of claim 1, wherein the template comprises Metal or a ceramic material. The method of claim 1, wherein the template also with at least one sheath insertion slot is equipped to a sheath for to record the power supply of the heating cable. The method of claim 1, wherein the template also an edge of a wall of Heizleitungenseinsetzschlitzes or on an edge of a wall of the Ummantelungseinsetzschlitzes equipped with a chamfer is. Electric heater for purifying exhaust gases a vehicle with an inner and an outer shell, which the electric heater in an inner and an outer section divide and which are powered by electrodes, one Heating cable with strips laminated to each other, designed in such a way is that the heating cable separately at an inner and outer section the electric heater can be arranged and that the Strip the heating cable connected to the inner and outer sheath are, and with a heat radiation shield, integral with an array of shrouds and heating cable is fixed, each casing divided into at least two parts is and the heating cable at the end of the heating cable, which means a fastener is connected to the sheaths, a just shaped surface a predetermined length having. An electric heater according to claim 5, wherein the strips of heating cable at different heights of the Jackets connected to the jackets are an influence between the electrode and the heating cable to eliminate conditions and a special surface area expand the sheath. An electric heater according to claim 5, wherein the sheath of an anode of the electrode has a length which is less is as the length of the Sheath of a cathode of the electrode. An electric heater according to claim 5, wherein each electrode has an electrode rod disposed at one end of the electrode rod is provided with a headed bolt, which at the Sheath is to attach a ceramic layer to the electrode rod surrounds at a portion of the electrode rod, and an electrode ring, which is arranged around the electrode rod such that the Electrode ring can surround the ceramic layer. An electric heater according to claim 8, wherein the electrode rod having at least one recess on an outer periphery of the electrode rod is fitted, where the electrode ring attached is. An electric heater according to claim 5, wherein the sheaths and the strips of heating cable by soldering together are connected. Electric heating device according to claim 5 or 10, wherein the sheaths and the strips of heating cable with each other by means of a base socket, which at a predetermined section the heating line is arranged, and a base element, in introduced the socket socket is at the same time the sheath touches connected. Electric heating device according to claim 5 or 10, wherein the sheaths and the strips of heating cable means a fastening pin are fastened together. An electric heater according to claim 5, wherein the heat radiation shield on the arrangement of the heating pipe and the sheathing using a Isolierstiftbaugruppe is attached, so that the heat radiation shield electrically is insulated from the heating cable and the sheaths. An electric heater according to claim 13, wherein the Isolierstiftbaugruppe a ceramic element with a through hole and an insulating pin formed in the through hole of the ceramic element introduced is. An electric heater according to claim 14, wherein the insulating pin in the Isolierstiftbaugruppe divided into two parts is, leaving a predetermined gap exists between the two parts of the insulating pin in the ceramic element.