JPH03102732A - Breaker - Google Patents

Abstract

PURPOSE:To protect a pressing spring from the hot gas of an arc by covering the pressing spring with a part of the insulating material covering the periphery of a contact point so that the pressing spring is not seen from the contact point direction. CONSTITUTION:Insulating materials 11, 12 are projected so that a pin 5 to which a pressing spring 4 of a movable contact 1 is hooked and a half of the pressing spring 4 near a movable contact point 2 are perfectly hidden. Consequently, when the movable contact 1 is opened, and an arc is generated in a space between the movable contact point 2 and a fixed contact point 8, the arc discharges the hot gas of high temperature to the periphery, and a part thereof is blown out to the direction of the pressing spring 4 and the pin 5, but the hot gas does not blow against the pressing spring 4 and the pin 5 directly because the projecting part shades them. The pressing spring 4 of the movable contact can thereby be protected from the hot gas of the arc.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a circuit breaker. [Prior art 1] Fig. 5 is a sectional side view showing a conventional circuit breaker disclosed in Japanese Patent Publication No. 47-49669, showing only the portions related to the present invention. In the figure, (1) is a movable contact;
(2) is the movable contact, (3) is the rotating shaft of the movable contact (1), (4) is the contact pressure spring (5) is the pin that hangs the contact pressure spring (4) on the movable contact (1), ( 6) is a frame that supports the rotating shaft (3), (7) is a bottle that hangs one end of the contact pressure spring (4) on the frame (6), (8) is a fixed contact, (9) is a fixed contact, ( 1 0) is Valya. Further, covering the area around the contact with an insulating material is disclosed in Japanese Utility Model Publication No. 63-25643.

Next, the operation will be explained. Due to the force of the contact spring (4), the movable contact (1) receives a moment about the axis of rotation (3). Normally, this force causes the movable contact (1
) rotates, and the movable contact (2) contacts the fixed contact (8). At this time, the contact pressure spring (4) is selected so that there is sufficient contact pressure between both contacts (2) and (8) to ensure complete electrical contact. In this state, an electric path is formed from the movable contact (1) to the fixed contact (9). Movable contact (
1) to the fixed contact (9), since the currents flowing through the movable contact (1) and the fixed contact (9) are antiparallel, both contacts (1). An electromagnetic repulsive force acts between (9). When the current is large and this electromagnetic repulsive force becomes greater than the force of the contact spring (4), the movable contact (1) rotates around the rotation axis (3), and both contacts (2). (8) opens and an arc occurs. The arc resistance generated at this time allows the passing current to be kept low. Also Barya (10)
is provided to prevent arc hot gas.

[Problem to be Solved by the Invention 1] Since the conventional circuit breaker is configured as described above, the barrier (10) is connected to the movable contact (1) in order to ensure smooth movement of the movable contact (1). Since the arc hot gas must be provided with an open movement range, the contact spring (4)
easy to reach.

For this reason, there is a problem that the contact pressure spring (4) is annealed by the hot gas of the arc and loses its elasticity or melts. This invention was made to solve the above-mentioned problems, and its object is to provide a circuit breaker that can completely protect the contact pressure spring of the movable contact from the hot gas of the arc.

[Means to solve the problem]

In the circuit breaker according to the present invention, the contact pressure spring hanging on the movable contact is covered with a part of the insulating material surrounding the movable contact so that it cannot be directly seen from the space between the movable and fixed contacts. .

[Operation J] In this invention, a part of the insulating material surrounding the movable contact covers the contact pressure spring applied to the movable contact so that the hot gas of the arc does not directly hit the movable contact. Damage to contact pressure springs is eliminated.

〔Example〕

An embodiment of this invention will be explained below with reference to the drawings. No.l
In the figure, (tB is an insulator that covers the movable contact (1) around the contact, and (12) is a part of the insulator (11) that extends sideways.The movable contact ( 1), contact pressure spring (4), etc., viewed from the space between the movable and fixed contacts.As is clear from Fig. 2, the movable contact (1)
), the bottle (5) to which the contact pressure spring (4) is hung, and the contact pressure spring (4)
) The insulators (11) and (12) protrude so as to completely hide about half of the movable contact (2).

Although not shown, a large current flows from the state where the movable contactor (1) is closed, and the operation of opening the movable contactor (1) is the same as in the conventional example. The movable contact (1) opens and an arc is generated in the space between the movable and fixed contacts (2) and (8). The insulator (11) covering the movable contact (1) around the movable contact (2) functions to narrow down the arc and increase the voltage of the arc, as shown in Japanese Utility Model Publication No. 63-25643.

The generated arc releases high-temperature gas into the surrounding area.

A part of it blows out in the direction of the contact pressure spring (4) and the bottle (5), but as shown in Figure 2, it is blocked by the overhanging part (l2) of the insulator (11), and the contact pressure spring (4) , the hot gas does not directly hit the bottle (5), so damage to the contact pressure spring (4) and the bottle (5) due to hot gas can be prevented.

Although the contact pressure spring (4) is a coil spring in the above embodiment, it may also be a torsion spring (4A) as shown in FIG. In FIG. 3, only the movable contact (1) portion is shown. If a twist spring (4A) is used as the contact pressure spring, the movable contact (1
) can be made compact so that the contact pressure spring can be protected.Therefore, there is no need to make the overhanging part (12) overhang the insulator (11) laterally, and the fourth
As shown in the figure, the contact pressure spring can be protected from the hot gas of the arc by the thickness of the insulator (11).

〔Effect of the invention〕

As described above, according to the present invention, the contact pressure spring is covered with a part of the insulating material surrounding the contact so that the contact pressure spring cannot be seen from the direction of the contact. It has a completely protective effect.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional side view showing a circuit breaker according to one embodiment of the present invention, FIG. 2 is a view of the movable contact portion of FIG. 1 viewed from the contact direction, and FIG. 3 is another embodiment of the present invention. Figure 4 is a side view of only the movable contact part; Figure 4 is a view of Figure 3 viewed from the right;
FIG. 5 is a cross-sectional side view showing a conventional device. In the figure, (1) is a movable contact, (2) is a movable contact,
(3) is the rotating shaft, (4) is the contact spring, (5) is the bottle, (
8) is a fixed contact, (9) is a fixed contact, and (l1) is an insulator.

Claims (1)

[Claims] (1) Consisting of at least a pair of contacts, at least one contact conductor of the pair of contacts has a rotating shaft, and a contact pressure spring that generates a moment around the rotating shaft is applied to the contact conductor; Further, an insulating material covers the periphery of the contact of the contact conductor, and at the same time, a part of the insulating material covers a portion of the contact pressure spring hanging on the contact conductor so that it cannot be seen directly from the direction of the contact. circuit breaker.