JPS6089021A - Arc distinguishing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to a fixed contact, a movable contact, an insulating longitudinal partition made of a gas-emitting substance, two legs, and an arc drive direction. The present invention relates to an arc extinguishing device in the form of an insulating material slit arc extinguishing chamber, which is particularly advantageous for low-voltage circuit breakers, and is equipped with a U-shaped core consisting of a connecting portion.

[Prior art and its problems]

Such a device is described in the Patent Publication No. 15 of the Federal Republic of Germany.
No. 88609. This device requires an auxiliary arc blowout coil in the area where the arc occurs.

Further, in a device for driving and extinguishing an arc between contact members of two substantially parallel conductors, at least three sides of the conductors are connected to a U-shaped magnetizable layered yoke consisting of a tether and two legs. It is also known that the yoke is surrounded by a yoke and has electrical insulation on the surface of the leg on the side closer to the contact member.

The legs of the yoke are arranged parallel to the plane of movement of the contact element on both sides of the contact element, and the tether of the yoke lies above the contact element in this plane of movement. This yoke generates a force applied to the arc between the contact members, and this force quickly drives the arc in the direction of arc movement to an arc extinguishing plate provided perpendicular to the plane of motion of the contact members (
(Federal Republic of Germany Patent Publication No. 2439532)
.

Furthermore, electric switches equipped with a magnetic arc blowing device in which a pair of pole plates are connected by a magnetic yoke are also known. This magnetic element is equipped with a coil which is connected to the fixed contacts of the switch via a conductor (German Patent Publication No. G 1063245).

However, the structures of these known arc extinguishing devices are not necessarily simple, and the arc extinguishing time is not sufficiently short.

[Purpose of the invention]

An object of the present invention is to provide an arc extinguishing device for use in a low-voltage circuit breaker, which generates a high arc voltage and quickly opens the contacts despite its simple structure, thereby shortening the arc extinguishing time. It is.

[Summary of the Invention] According to the invention, the above object is achieved by providing one core leg on each side of the contact parallel to the plane of motion of the contact and winding at least once around the joint of the core. This is achieved by providing a current loop with a portion of the current loop close to the contact being separated from the contact by a partition made of a gas-emitting substance.

By providing one leg on each side of the contact parallel to the plane of movement of the contact, it is possible to dispense with auxiliary coils for arc blowing in the arcing area. Furthermore, the magnetic field created between both legs supports the opening movement of the two contacts moving relative to each other.

By providing a current loop wound at least once around the joint of the U-shaped core, and by forming this current loop as part of a fixed contact, the joint of the core does not saturate even at high arc currents. A large magnetic flux is generated inside the house.

Furthermore, a large electromagnetic force is applied to the arc, thereby significantly increasing the magnetic arc blowing effect.

Since the part of the coil closer to the contacts is isolated from the arc by a partition made of a gas-emitting substance, this part of the insulating material slit arc extinguishing chamber is additionally deionized by the emitted gas. An action occurs, whereby the arc is strongly cooled. Furthermore, it becomes possible to protect this part of the coil from arcing.

[Embodiments of the invention]

In the embodiment according to FIG. 1, contacts 2 and 4, which carry current and move relative to each other, are surrounded by a U-shaped core 6, of which contact 2 is formed as a fixed contact and contact 4 as a movable contact. has been done.

The contacts 2 and 4 are provided at their ends with contact tips 8 and 10, between which an arc, numbered 12 in the drawing, occurs during contact opening. The iron core 6 has a connecting part 14 and two legs 1
6 and 58. A current loop 20 having at least one turn is provided around the tether 14 . This current loop 20 is formed as part of the fixed contact 2. The part 22 of the coil closer to the arc 12 is
It is protected by a partition wall 24 made of a gas-emitting substance.

As shown in FIG. 2, 5-1 core legs 16 or Viis are provided on each side of the contacts 2 and 4 parallel to the plane of motion of the contacts 2 and 4.

On the surfaces of the legs 16 and 18 of the iron core 6 that partition the space 26, an insulating longitudinal partition wall 28 made of a substance that releases gas is provided.
and 30 are provided. There is only a very small distance between the longitudinal partitions 28 and 30 and the contacts 2 and 4, as is customary, for example, in the case of insulating material slit arcing chambers. By structurally determining the dimensions of the arc extinguisher, the height of the arc voltage is predetermined.

With such a configuration, a coil for magnetically blowing out the arc becomes unnecessary. Although the structure of the arc extinguishing device is simple, it is possible to obtain an at least substantially uniform magnetic blowing effect distributed over the entire area of the arc extinguishing chamber.

This effect is even stronger near the current loop 20. Furthermore, the magnetic field between the legs 16 and 1B of the core supports the opening movement of the contacts 2 and 4. Added to this is the strong cooling effect provided by the longitudinal partitions 28 and 30 and partition 24.

Therefore, an arc extinguishing device with an extremely short arc extinguishing time suitable for use in low pressure circuit breakers can be obtained.

6- [Effects of the Invention] In the present invention, one iron core leg is provided on each side of the contact parallel to the plane of motion of the contact, so an auxiliary coil to blow out the arc can be eliminated. The magnetic field between both legs assists in the opening movement of the contacts, and the presence of a current loop wrapped around the core joint at least once allows the joint to remain stable even at high arc currents. A large magnetic flux is generated before the arc is saturated, which significantly enhances the magnetic arc blowing effect.
Furthermore, since the portion of this current loop that is closer to the contact is separated from the contact by a barrier of gas-emitting material, the gas emitted from this portion produces an additional deionization effect, thereby causing an arc. is strongly cooled. As a result, the arc extinguishing device according to the present invention can be used as a low-voltage circuit breaker, although it has a simple structure, generates high arc voltage, and quickly opens the contacts, thereby shortening the arc extinguishing time. FIG. 2 is a plan view of this arc extinguishing device.

2: Fixed contact, 4: Movable contact.

6. U-shaped iron core, 14. Joint part of iron core.

16.18...Legs of iron core, 20...Current loop.

24...Partition wall, 2g, 3008. Longitudinal bulkhead.

Claims (1)

[Scope of Claims] A U-shaped core comprising a fixed contact, a movable contact, an insulating longitudinal bulkhead made of a gas-emitting substance, and two legs and a connecting part disposed in the arc driving direction. In an arc extinguishing device of the insulating material slot arc extinguishing chamber type, one core leg is provided on each side of the contact parallel to the plane of movement of the contact. An arc extinguishing device characterized in that a current loop is provided which is wound at least once around the joint of the iron core, the part of the current loop close to the contact point being separated from the contact point by a partition consisting of a gas-emitting substance. Device.