Switching device with two stationary contacts and a movable contact in a switching chamber

Patent metadata

Field	Value
Publication number	US-11462379-B2
Application number	US-201917045290-A
Country	US
Kind code	B2
Filing date	Apr 12, 2019
Priority date	Apr 19, 2018
Publication date	Oct 4, 2022
Grant date	Oct 4, 2022

Abstract

In an embodiment a switching device includes at least two stationary contacts and one movable contact in a switching chamber, wherein the switching chamber has a switching chamber wall, wherein each of the stationary contacts projects into the switching chamber through a respective opening in the switching chamber wall, and wherein, on an inner side of the switching chamber that faces the movable contact, a continuous surface region occluded from the stationary contacts is located between the openings in the switching chamber wall.

First claim

The invention claimed is:

1. A switching device comprising:
at least two stationary contacts in a switching chamber; and
one movable contact in the switching chamber,
wherein the switching chamber has a switching chamber wall,
wherein each of the stationary contacts projects into the switching chamber through a respective opening in the switching chamber wall,
wherein, on an inner side of the switching chamber that faces the movable contact, a continuous surface region occluded from the stationary contacts is located between the openings in the switching chamber wall,
wherein the continuous surface region comprises a trench, and
wherein a bottom and a top of the trench are curved so that the trench has a curved wave-like cross section.

2. The switching device according to claim 1 , wherein the trench, as seen from the stationary contacts, forms an undercut.

3. The switching device according to claim 2 , wherein the trench has a width B and a depth T, where B<T.

4. The switching device according to claim 3 , wherein 2·B<T.

5. The switching device according to claim 3 , wherein B is greater than or equal to 0.5 mm and less than or equal to 2 mm.

6. The switching device according to claim 3 , wherein T is greater than or equal to 1 mm and less than or equal to 4 mm.

7. The switching device according to claim 1 , wherein the continuous surface region is arranged between at least two dam-like raised portions extending above the inner side of the switching chamber.

8. The switching device according to claim 1 , wherein the continuous surface region is arranged symmetrically in relation to the stationary contacts.

9. The switching device according to claim 1 , wherein the switching chamber wall includes a metal oxide ceramic or a plastic.

10. The switching device according to claim 1 , wherein a gas comprising H 2 is contained in the switching chamber.

11. The switching device according to claim 10 , wherein the gas has an H 2 content of at least 50%.

12. The switching device according to claim 1 , wherein the top of the trench is located at two dam-like raised portions extending above the inner side of the switching chamber.

Assignees

• Tdk Electronics Ag

Inventors

• Werner Frank
• Hoffmann Robert

Classifications

• H01H50/36

  Stationary parts of magnetic circuit, e.g. yoke · CPC title

• H01H50/023

  Details concerning sealing, e.g. sealing casing with resin · CPC title

• H01H2050/025

  containing inert or dielectric gasses, e.g. SF6, for arc prevention or arc extinction · CPC title

• H01H1/20

  Bridging contacts {(for circuit breakers H01H73/045)} · CPC title

• H01H50/60

  moving contact being rigidly combined with movable part of magnetic circuit {(for polarised relays H01H51/2254, H01H51/2281)} · CPC title