Electromagnetic switching apparatus

Abstract

In an electromagnetic switching device including a cylindrical part made of a magnetic material with a closed bottom for housing a movable iron core having a movable contact and so constructed as to render the movable contact movable toward and away from a fixed contact, a joint member made of a metallic material with an insertion hole formed substantially in the center thereof for movably receiving a movable shaft fixedly attached to the movable iron core, and a metal plate made of a non-magnetic material with a hole formed substantially in the center thereof with the inner diameter substantially the same as the inner diameter of the cylindrical part, the cylindrical part and the joint member are air-tightly jointed to each other with the metal plate provided therebetween, and the movable iron core is housed in the cylindrical part with a clearance defined between the movable iron core and the joint member corresponding to a required stroke within which the movable contact contacts the fixed contact. This arrangement provides improvement in magnetic efficiency of electromagnet of the device. Accordingly, improved energy saving performance is accomplished as compared with a case of a conventional electromagnetic switching device.

Description

Technical field [0001] The invention relates to an electromagnetic switch device including a sealed contact device, which is suitable for use as a relay for power-driven loads. Background technique [0002] Such as Figure 21 As shown, it proposes an electromagnetic switch device 100 including a sealed contact device, which is disclosed in Japanese Patent No. 3107288 (corresponding to Japanese Unexamined Patent Publication No. 9-259728). The structure of the device 1000 is that the relay contact part is placed in a closed or airtight space. With this configuration, since there is no possibility that the arc generated when the contact device is opened will leak to the outside of the equipment, this configuration does not require the space for the leaked arc that is necessary in the air conversion equipment, and can also reduce Each component is in close contact with the device to increase packaging density. The device 1000 is constructed as follows. [0003] Refer to Figure 21 , ...

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Problems solved by technology

However, in such controllers, the coil emits a large amount of noise, which adversely affects electronic components and electromagnetic switching devices, etc., near the coil.

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