JPS5949122A - Power breaker - 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 The present invention relates to a power breaker, particularly to the structure of a contact portion thereof.

A typical example of a conventional guard tower structure is shown in Figure 1.

Referring to Figure 1, (1) is the fixed main contact for the head load, (
2) is a fixed arc contactor for arc extinguishing, -(3)
is the nozzle, and (4) is a finger-shaped metal that contacts with (2). f front arc contactor, (,5) mouth J′ drive contactor in contact with ld (]), (6) ll″1 fixed piston,
(7) is a cylinder that interrupts OI at the same time as (3), (4), and (5), and thus constitutes the arc extinguishing chamber of the buffer type gas breaker.

The arc extinguishing chamber in Figure 1 is not shown. 1flJ device f&
The nozzle (3), arc contactor (4), movable main contactor (5), and cylinder (7) of town 11 move in the direction of the arrow. Iρ
J and put it in. By the way, in recent years, the current has been stubbornly increasing, and in that case, in the conventional arc extinguishing chamber, Kt+f when turned on.
fl When an arc occurs between the constant arc contact (2) and the movable arc contact (4), it acts to expand the finger-shaped isinger-shaped portion of the movable arc contact (4) outward in the radial direction. , 0T# arc contact (4) is f
A phenomenon began to take shape. , 'z &-1, no further 7zf-type phenomenon occurs. In general, it is thought that the finger-like contact is deformed inward in the radial direction due to the current flowing inward to each finger, and this inward deformation is caused by the loss of one place or the other due to the time of throwing. It is thought that the rr name may occur sometimes, but in reality, when the energization flow line is increased, the above-mentioned outward direction is The airfoil shape is caused by Ushidakuri J.

I'm humbled by the above result) Again,
To provide a gravity breaker having various advantages such as preventing deformation of a contact due to a rectangular shape and making the above key-shaped prevention possible without increasing the size of the contact. FIG. 2 shows a schematic structure of an embodiment of the present invention (8-helical arc contactor deformation prevention material IS1).

Figure 433 is a detailed diagram showing the bottom structure of an embodiment of the present invention. This is a space formed between the arc contactor (1) and the deformation prevention part (O (8)), which is formed into a cylindrical shape with steel or other metal material and which removes the arc contactor (1). The distal end (8a) in the urinary direction is located a set distance [(j) behind the distal end (1a) having the electrolytic slowing function of the arc contact (1a). located above the tip (8
This is to prevent electric field concentration from occurring in a). Also,
The deformation prevention member (8a) is formed by cutting the arc contactor (1) and 1 from an integral member with a lathe or other means, but the arc contactor has 40 parts of electric field relaxation and the finger In addition to the complex shape, space (9)
The manufacturing technology is excellent because it is formed entirely by cutting,
Moreover, if the space (9) is not provided and the deformation prevention member (8) is
) and the arc contact (υ) are integrally formed, the elasticity of the finger-shaped arc contact becomes small, so in order to ensure the elasticity, the arc contact must be made longer in the axial direction. Such a drawback does not occur in the structure shown in the figure.In addition, in FIG. 3, (10) is a screw for screwing the deformation prevention member (8) to the arc contactor (1).

As described above, the present invention includes a pair of contacts that move relatively linearly and open and close each other, and in which at least one of the contacts is a finger-shaped contact, the finger-shaped contact Along its lll1l
A metal contact deformation preventing member is provided which extends in the l-line direction and surrounds the contact with a predetermined space therebetween, and the tip of the contact deformation preventing member in the axial direction is connected to the finger-shaped contact. Since the finger-shaped contact and the contact deformation prevention member are separate, it is possible to prevent large currents from being applied as the capacity increases. Even when the finger-shaped contact has to be removed, it is possible to prevent the finger-shaped contact from deforming outward in the radial direction, and there is no need to increase the size of the contact itself. It has a festival effect.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional 'gravity rack', Fig. 2 is a schematic sectional view showing an embodiment of the present invention, and Fig. 3 is an enlarged view of the = section in Fig. 2. FIG. In the figure, (1) is a fixed main contact, (2) is a fixed arc contact, (4) is a movable arc contact, (5) is a movable main contact, (8) is a deformation prevention member, and (9) is a movable main contact. is space. Note that the same reference numerals in the figures indicate the same or equivalent parts. Figure 1

Claims (1)

[Scope of Claims] (In a device comprising a pair of contacts that move linearly in a sealing manner and open and close each other, at least one of the contacts is a finger-shaped contact, the above-mentioned finger-shaped contact A metal contact deformation prevention member is provided on the contact, extends in the axial direction of the contact, and surrounds the contact with a predetermined space, and furthermore, the axial tip of the contact deformation prevention member is provided. A power interrupter, characterized in that the finger-shaped contact is located rearward from the tip in the axial direction, and the finger-shaped contact and the contact deformation prevention member are separate bodies. vessel.