Hermetically sealed electromagnetic contactor

Patent metadata

Field	Value
Publication number	US-2023134636-A1
Application number	US-202218091013-A
Country	US
Kind code	A1
Filing date	Dec 29, 2022
Priority date	Jan 22, 2021
Publication date	May 4, 2023
Grant date	—

Abstract

A hermetically sealed electromagnetic contactor including: a main contact unit including a pair of main fixed contact pieces, each of the main fixed contact pieces having a main fixed contact at one end and a terminal portion to be connected to a main circuit at the other end, and a main movable contact piece having a pair of main movable contacts configured to come into contact with and be separated from the main fixed contacts and configured to open and close an electrical path of the main circuit; a contact support configured to support the main movable contact piece; an electromagnet unit configured to switch opening/closing of the main contact unit via the contact support; and a hermetically sealed container made of resin on an inside of which the main contact unit and the electromagnet unit are arranged, the hermetically sealed container having the inside filled with insulating gas.

First claim

1 . A hermetically sealed electromagnetic contactor comprising:
a main contact unit including a pair of main fixed contact pieces, each of the main fixed contact pieces having a main fixed contact at one end and a terminal portion to be connected to a main circuit at the other end, and a main movable contact piece having a pair of main movable contacts configured to come into contact with and be separated from the main fixed contacts and configured to open and close an electrical path of the main circuit; a contact support configured to support the main movable contact piece; an electromagnet unit configured to switch opening/closing of the main contact unit via the contact support; and a hermetically sealed container made of resin on an inside of which the main contact unit and the electromagnet unit are arranged, the hermetically sealed container having the inside filled with insulating gas.

2 . The hermetically sealed electromagnetic contactor according to claim 1 , wherein
a spring member is arranged in the hermetically sealed container, and the spring member presses the electromagnet unit to the main contact unit side of the hermetically sealed container.

3 . The hermetically sealed electromagnetic contactor according to claim 2 comprising:
a coil contact piece having one end side arranged inside the hermetically sealed container and the other end side connected to a control circuit outside the hermetically sealed container; and
a relay contact piece to which a coil of the electromagnet unit is connected, the relay contact piece being fixed to a spool of the electromagnet unit,
wherein the spring member is arranged between the coil contact piece and the relay contact piece.

4 . The hermetically sealed electromagnetic contactor according to claim 3 , wherein the coil contact piece is subjected to surface treatment by chemical etching and is integrated with the hermetically sealed container by insert molding.

5 . The hermetically sealed electromagnetic contactor according to claim 1 comprising a plurality of the main contact units.

6 . The hermetically sealed electromagnetic contactor according to claim 5 , wherein the hermetically sealed container internally includes a partition wall member made of resin and configured to partition the main contact units from each other.

7 . The hermetically sealed electromagnetic contactor according to claim 1 , wherein the pair of main fixed contact pieces are formed in flat plate shapes and extend along a surface orthogonal to a direction in which the main contact unit is opened and closed.

8 . The hermetically sealed electromagnetic contactor according to claim 1 , wherein the main fixed contact pieces are subjected to surface treatment by chemical etching and are integrated with the hermetically sealed container by insert molding.

9 . The hermetically sealed electromagnetic contactor according to claim 1 comprising:
a pair of auxiliary fixed contact pieces arranged with a gap interposed between one end sides inside the hermetically sealed container, each of the auxiliary fixed contact pieces having an auxiliary fixed contact formed on one end side and the other end side connected to an auxiliary circuit outside the hermetically sealed container; and
an auxiliary movable contact piece supported by the contact support, having auxiliary movable contacts formed on both end sides, and configured to cause the auxiliary movable contacts to respectively come into contact with and be separated from the auxiliary fixed contacts,
wherein the pair of auxiliary fixed contact pieces are subjected to surface treatment by chemical etching and are integrated with the hermetically sealed container by insert molding.

10 . The hermetically sealed electromagnetic contactor according to claim 9 , wherein
each of the pair of auxiliary fixed contact pieces is formed in a flat plate shape and, on the other end side located outside the hermetically sealed container, an insertion hole larger than outer diameter of an external threaded portion of a terminal screw to be connected to the auxiliary circuit is formed, on the hermetically sealed container, terminal receiving portions are formed on a back surface side of the auxiliary fixed contact pieces located outside the hermetically sealed container, in each of the terminal receiving portions, a nut member made of metal in which a bottomed threaded hole into which the terminal screw is fitted is formed is disposed, and the nut members are subjected to surface treatment by chemical etching and are integrated with the terminal receiving portions by insert molding.

11 . The hermetically sealed electromagnetic contactor according to claim 1 , wherein, to the hermetically sealed container, gas barrier coating is applied using laminated films of clay crystals.

Assignees

• Fuji Electric Fa Components & Systems Co Ltd

Inventors

• Tsutsumi Takashi
• KONISHI Koujun
• Adachi Hideo

Classifications

• H01H50/541

  Auxiliary contact devices · CPC title

• H01H1/66 Primary

  Contacts sealed in an evacuated or gas-filled envelope, e.g. magnetic dry-reed contacts · CPC title

• H01H50/443

  Connections to coils · CPC title

• H01H50/023

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

• H01H50/56

  Contact spring sets · CPC title