METHOD FOR PRODUCING AN ELECTRICAL FEEDTHROUGH AND ELECTRICAL FEEDTHROUGH

Abstract

A method for producing an electrical feedthrough with an inner conductor arranged in some sections in a metallic outer pipe and electrically insulated from this outer pipe by an electrically insulating material. The inner conductor of the feedthrough has a contact section projecting out of the metallic outer pipe. The metallic outer pipe, the electrically insulating material, and the sections of the inner conductor, which are already arranged in the metallic outer pipe, are compressed with each other to form a module, in which the contact section projecting out of the metallic outer pipe is joined to the inner conductor only after completion of the compression of the metallic outer pipe, the electrically insulating material, and the sections of the inner conductor, which are already arranged in the metallic outer pipe. The contact section is positioned such that it is oriented along the center axis of the metallic outer pipe.

Claims

1. A method for producing an electrical feedthrough with a single-part or multiple-part inner conductor arranged at least in sections in a metallic outer pipe and electrically insulated from the outer pipe by an electrically insulating material, wherein the single or multiple-part inner conductor of the feedthrough has a contact section projecting out of the metallic outer pipe, wherein the metallic outer pipe, the electrically insulating material, and the single-part or multiple-part inner conductor, which are arranged in the metallic outer pipe, are compressed with each other to form a module, the contact section projecting out of the metallic outer pipe being joined to the single-part or multiple-part inner conductor only after completing the compression of the metallic outer pipe, the electrically insulating material, and the sections of the single-part or multiple-part inner conductor, which are already arranged in the metallic outer pipe, to form the module, wherein the contact section is positioned such that the contact section is oriented along a center axis of the metallic outer pipe.

2. The method according to claim 1, wherein before joining the contact section, but after completing the compression of the metallic outer pipe, the electrically insulating material, and the sections of the single-part or multiple-part inner conductor, which are already arranged in the metallic outer pipe, to form the module, a position of the inner conductor relative to the outer pipe is determined and the determination is used for positioning the contact section.

3. The method according to claim 1, wherein before joining the contact section, but after completing the compression of the metallic outer pipe, the electrically insulating material, and the sections of the single-part or multiple-part inner conductor, which are already arranged in the metallic outer pipe, to form the module, the position of the center axis of the outer pipe is determined and the determination is used for positioning the contact section.

4. The method according to claim 1, wherein the contact section is joined such that the contact section is machined out of a section of the single-part or multiple-part inner conductor.

5. The method according to claim 4, wherein the contact section of the single-part or multiple-part inner conductor, from which the contact section is machined, is previously exposed by the removal of parts of the metallic outer pipe and the electrically insulating material, which were compressed with the inner conductor to form the module.

6. The method according to claim 1, wherein the contact section is joined such that a separate section is joined by connecting the single-part or multiple-part inner conductor.

7. The method according to claim 6, wherein the contact section is welded or soldered to an end side of a part of the single-part or multiple-part inner conductor arranged at least partially within the metallic outer pipe.

8. The method according to claim 6, wherein a section of the contact section is inserted into an opening on an end side of a part of the single-part or multiple-part inner conductor arranged at least partially within the outer pipe and is welded or soldered to the sinule-part or multiple-part inner conductor.

9. An electrical feedthrough with a single-part or multiple-part inner conductor arranged at least in some sections in a metallic outer pipe and electrically insulated from the metallic outer pipe by an electrically insulating material, wherein the inner conductor of the electrical feedthrouuh has a contact section projecting out of the metallic outer pipe, wherein the metallic outer pipe, the electrically insulating material, and sections of the single-part or multiple pipe-part inner conductor, which are arranged completely in the metallic outer pipe, are compressed with each other to form a module, characterized in that a center axis of the inner conductor is offset relative to the center axis of the outer pipe and has a tilted profile and the contact section is offset relative to acenter axis of the inner conductor and is arranged centered on the center axis of the outer pipe.

10. The electrical feedthrough according to claim 9, wherein the contact section is machined from a section of the single-part or multiple-part inner conductor, so that the inner conductor is a single piece with the contact section.

11. The electrical feedthrough according to claim 9, wherein the contact section is a separate section that is soldered or welded with the rest of the inner conductor.

12. The electrical feedthrough according to claim 11, wherein a section of the contact section is inserted into an opening on an end side of a part of the single-part or multiple-part inner conductor arranged at least partially within the outer pipe and is welded or soldered to the single-part or multi-part inner conductor

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

[0029] The foregoing summary, as well as the following detailed description of the preferred invention, will be better understood when read in conjunction with the appended drawings. For the purpose of illustrating the preferred invention, there are shown in the drawings embodiments which are presently preferred. It should be understood, however, that the invention is not limited to the precise arrangements and instrumentalities shown. In the drawings:

[0030] FIG. 1 is a perspective view of a portion of a compressed module produced in a first section of a method for producing an electrical feedthrough,

[0031] FIG. 2 is a cross-sectional view of a first variant of further processing of the module from FIG. 1 to form the electrical feedthrough,

[0032] FIG. 3 is a side elevational, partial cross-sectional view of a second variant of further processing of the module from FIG. 1 to form the electrical feedthrough,

[0033] FIG. 4a is a longitudinal cross-sectional view through the module from FIG. 1 after a first step of a third variant of the further processing of the module to form the electrical feedthrough,

[0034] FIG. 4b is a side perspective view of a second step of the third variant of the further processing of the module to form the electrical feedthrough, and

[0035] FIG. 4c is another side perspective view of a resulting embodiment of the electrical feedthrough.

DETAILED DESCRIPTION OF THE INVENTION

[0036] FIG. 1 shows a compressed module 1 with a metallic outer pipe 10, an electrically insulating material 20, and an inner conductor 30. As can be seen on closer inspection of FIG. 1, especially the end side facing the viewer, directly when comparing the indicated exit point M of the center axis of the inner conductor 30 with the position of the center axis A of the outer pipe 10, after the compression, the inner conductor 30 is not centered in the outer pipe 10, but offset or tilted relative to it. This can be caused, for example, by errors in the positioning of the inner conductor 30 in the outer pipe 10, such as a parallel offset or tilted orientation, even before the compression step or due to effects of inhomogeneities in the electrically insulating material 20 during the compression and is present in varying degrees of severity although regularly present—here the effect is shown significantly exaggerated. At the same time, the positional deviation of the inner conductor 30 from its ideal position can also be recognized from the fact that the layer of electrically insulating material 20 has different thicknesses in different radial directions.

[0037] FIG. 2 shows a longitudinal section through an end area of an electrical feedthrough 100 produced according to a first method from such a module 1 with outer jacket 10, electrically insulating material 20, which is here constructed as magnesium oxide granulate, and single-part inner conductor 30. The feedthrough 100 is produced from the completely compressed module 1 shown in FIG. 1 such that a contact section 31 is exposed by the removal of areas shown in FIG. 2 by dashed lines in the outer jacket 10, the electrically insulating material 20, and the inner conductor 30 with the tool 2. When looking at this contact section 31, it is immediately apparent that, unlike in the prior art, it is not centered relative to the cylindrical body of the inner conductor 30 arranged within the section of the outer pipe 10 that has not been removed, but instead relative to the outer pipe 10, so that despite the compression, the contact section 31 is arranged at the correct position and thus an exact contact can be made.

[0038] FIG. 3 shows a longitudinal section through an end area of an electrical feedthrough 200 produced according to a second method from such a module 1 with outer jacket 10, electrically insulating material 20, and multiple-part inner conductor 30, which is here formed by the inner conductor arranged within the outer pipe 10 and the separately produced contact section 32 connected to this outer pipe via the solder or weld contact 33. The feedthrough 200 is produced from the completely compressed module 1 shown in FIG. 1 such that a preassembled contact section 32 is soldered or welded on the end side to the section of the inner conductor arranged within the outer pipe 10.

[0039] When looking at this contact section 32, it is immediately apparent that, unlike in the prior art, it is not centered relative to the cylindrical body of the inner conductor arranged within the section of the outer pipe 10 that has not been removed, but instead relative to the outer pipe 10, so that, despite the compression, the contact section 32 is arranged at the correct position and thus an exact contact can be made.

[0040] FIGS. 4a-4c show different stages from different perspectives in the production of an electrical feedthrough 300, whose one end area is shown in FIG. 4c, according to a third method from such a module 1 with outer jacket 10, electrically insulating material 20, and multiple-part inner conductor 30, which is formed here by a section of the inner conductor 30 arranged completely within the outer pipe 10 and a separately produced contact section 35.

[0041] As shown in FIG. 4a, an opening 34 is formed in the section of the inner conductor 30 arranged completely within the outer pipe 10, and indeed not centered relative to the cylindrical body of the inner conductor 30 arranged within the section of the outer pipe 10 that has not been removed, but instead relative to the outer pipe 10. This can be realized, for example, by drilling.

[0042] A separately produced contact section 35, which has, in this embodiment, an annular groove, in which a solder ring 36 is arranged, is then inserted into the opening 34 and fastened there with solder from the solder ring 36 by soldering, so that a multiple-part inner conductor 30 is produced.

[0043] FIG. 4c then shows the electrical feedthrough 300 produced in this way with the multiple-part inner conductor 30 arranged at least in some sections in a metallic outer pipe 10 and electrically insulated from this outer pipe by an electrically insulating material 20, with the inner conductor having the contact section 35 projecting out of the metallic outer pipe 10, wherein the metallic outer pipe 10, the electrically insulating material 20, and the parts of the multiple-part inner conductor 30, which are arranged completely within the metallic outer pipe 10, are compressed with each other to form a module 1. It can be seen, in particular, that a center axis M of the inner conductor 30 is offset relative to the center axis A of the outer pipe 10 and/or has a tilted profile and that the contact section 35 is arranged offset relative to the center axis M of the inner conductor 30 and centered on the center axis A of the outer pipe 10, so that the contact section 35 is positioned precisely.

[0044] It will be appreciated by those skilled in the art that changes could be made to the embodiments described above without departing from the broad inventive concept thereof. It is understood, therefore, that this invention is not limited to the particular embodiments disclosed, but it is intended to cover modifications within the spirit and scope of the present invention as defined by the appended claims.

LIST OF REFERENCE SYMBOLS

[0045] 1 Module [0046] 2 Tool [0047] 10 Outer pipe [0048] 20 Electrically insulating material [0049] 30 Inner conductor [0050] 31, 32, 35 Contact section [0051] 33 Solder or weld contact [0052] 34 Opening [0053] 36 Solder ring [0054] 100, 200, 300 Electrical feedthrough