Fluid-tight line feedthrough
View Patent ↗A fluid-tight line feedthrough for introducing an electric conductor into a high-pressure chamber includes a housing and an electric conductor that passes through the housing. A ceramic insulator is positioned between the housing and the electric conductor. The ceramic insulator is divided into a first insulator segment facing the electric conductor and a second insulator segment facing the housing, thereby forming a conical separating plane. A fitting made of an electrically conductive material is positioned between the two segments, the fitting being connected to the two segments and to the housing.
1. A fluid-tight line feedthrough for introducing an electrical conductor ( 2 ) into a high-pressure chamber, comprising:
a housing ( 4 );
the electrical conductor ( 2 ) arranged so as to penetrate the housing ( 4 );
a ceramic insulator ( 3 ) positioned between the housing ( 4 ) and the electrical conductor ( 2 ), the ceramic insulator ( 3 ) being subdivided into:
a first insulator segment ( 7 ) facing the electrical conductor ( 2 ), and
a second insulator segment ( 8 ) facing the housing ( 4 );
the ceramic insulator ( 3 ) being subdivided so as to form a conical separating plane ( 6 ) into the first insulator segment ( 7 ) and the second insulator segment ( 8 ); and
a fitting ( 9 ) of an electrically conductive material positioned between the first and second insulator segments ( 7 , 8 ), the fitting ( 9 ) being connected to the first and second insulator segments ( 7 , 8 ) and to the housing ( 4 ), at least a portion of the fitting ( 9 ) being sandwiched between the first and second insulator segments ( 7 , 8 ).
2. The line feedthrough according to claim 1 , wherein the ceramic insulator ( 3 ) has insulator separating surfaces ( 19 ), the line feedthrough further comprising metallized separating surfaces ( 10 ) of the conical separating plane ( 6 ), the metallized separating surfaces ( 10 ) and the fitting ( 9 ) being connected to the insulator separating surfaces ( 19 ) by soldering.
3. The line feedthrough according to claim 2 , wherein the fitting ( 9 ) is connected to the housing ( 4 ) by welding.
4. The line feedthrough according to claim 3 , wherein a gap ( 17 ) is provided between the first insulator segment ( 7 ) facing the electrical conductor ( 2 ) and the electrical conductor ( 2 ), the gap ( 17 ) being of an order of magnitude between 0.01 mm to 0.1 mm.
5. The line feedthrough according to claim 3 , wherein a gap ( 17 ) is provided between the first insulator segment ( 7 ) facing the electrical conductor ( 2 ) and the electrical conductor ( 2 ), the gap ( 17 ) being of an order of magnitude between 0.03 mm to 0.05 mm.
6. The line feedthrough according to claim 1 , wherein the first insulator element ( 7 ) is metallized on an inner face ( 14 ) facing the electrical conductor ( 2 ).
7. The line feedthrough according to claim 1 , wherein the electrical conductor ( 2 ), the ceramic insulator ( 3 ) and the housing ( 4 ) have stepped diameters.
8. The line feedthrough according to claim 7 , wherein the electrical conductor ( 2 ) on a high-pressure chamber side section of the line feedthrough has a larger outer diameter than on a low-pressure chamber side section of the line feedthrough, such that the high-pressure chamber side section of the electrical conductor ( 2 ) engages on the high-pressure chamber side behind a high-pressure chamber side section of the ceramic insulator ( 3 ) and the housing ( 4 ) on a high-pressure chamber side section has a greater inner diameter than on a low-pressure chamber side section such that the low-pressure chamber side section of the housing ( 4 ) engages on the low-pressure chamber side behind a middle section of the ceramic insulator ( 3 ).
9. The line feedthrough according to claim 8 , further comprising a further fitting ( 15 ) of an electrically conductive material positioned between the high-pressure chamber side section of the electrical conductor ( 2 ) and the high-pressure chamber side section of the ceramic insulator ( 3 ), the further fitting ( 15 ) being connected to the ceramic insulator ( 3 ) and to the electrical conductor ( 2 ).
10. The line feedthrough according to claim 9 , wherein the ceramic insulator ( 3 ) is metallized on a face ( 16 ) facing the further fitting ( 15 ), and the further fitting ( 15 ) is connected to this face ( 16 ) of the ceramic insulator ( 3 ) by soldering.
11. The line feedthrough according to claim 10 , wherein the further fitting ( 15 ) is connected to the electrical conductor ( 2 ) by welding.
12. The line feedthrough according to claim 11 , further comprising an electrically conductive element ( 20 ) positioned between the low-pressure chamber side section of the housing ( 4 ) and the middle section of the ceramic insulator.
13. The line feedthrough according to claim 9 , wherein at least one selected from the group consisting of the fitting ( 9 ) and the further fitting ( 15 ) consists of a copper material.
14. The line feedthrough according to claim 1 , further comprising a first casting compound ( 21 ) of an epoxy resin on the high-pressure chamber side end, wherein the first casting compound ( 21 ) surrounds the ceramic insulator ( 3 ) and the electrical conductor ( 2 ) in sections.
15. The line feedthrough according to claim 14 , further comprising a second casting compound ( 22 ) of a silicon on the low-pressure chamber side end, wherein the second casting compound ( 22 ) surrounds the ceramic insulator ( 3 ) and the electrical conductor ( 2 ) in sections.