JPS59180928A - Switch - 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 switch, and more particularly to a switch which suppresses the pressure X inside a container of a bag-opening/closing device. Note that the switch referred to in this invention particularly refers to a container such as a circuit breaker, a current limiter, an electromagnetic switch, etc., which usually generates an arc within a small container.

The present invention will be explained below using a circuit breaker as an example.

Figures 1 to 8 are cross-sectional views showing conventional circuit breakers.
Each shows a different operating state.

(1) is a cover, (2) is a base, and the cover (1) and the base (2) constitute a container (3). (4) is a fixed contact, which has a fixed conductor (5), A fixed contact (
6), and the other end is a terminal portion to be connected to an external conductor (not shown). (7) is a movable contact, which has a movable conductor (8), and has at one end a movable contact (9) facing the fixed contact (6). αQ is a movable contact device, and 0υ is a movable arm, which is fixed to the crossbar (6) and is configured to open and close at each pole. (+3 is the arc extinguishing chamber and the arc extinguishing plate Q→ is held by the side plate a9.Q1
19 is a toggle link mechanism, with upper link αη and lower link α
It is made up of marks. One end of the upper link aη is connected to the Freddle 01, and the other end is connected to one end of the lower link (to) by a shaft (a) &]). The other end of the lower link 0 barrel is the movable contact device (lFc+ movable arm aυ
is connected to. (4) is the originating form operation no 1ndle, (
A) is an operating spring that is stretched between the axis Qυ of the toggle link mechanism OQ and the above-mentioned operation handle (A). (2
41, (c) are thermal and electromagnetic trip mechanisms, respectively, and when activated (respectively, the bimetal (e) and movable iron core @) are used to rotate the knob bar (c) counterclockwise. t29+ is a win that has one end locked to the trip hook and the other end locked to the fredl q field.

When the operating handle (a) is tilted to the open position with the fredl OCJ engaged with the latch (29), the toggle link mechanism αQ is extended, the shaft Qυ is locked to the fredl QQ, and the movable contact (9) becomes a fixed contact. (6) to join. This state is shown in FIG. Next, when the operating handle (2) is tilted to the open position, the toggle link mechanism 0 is bent and the movable contact (9)
is opened from the fixed contact (6), and the movable arm αυ is locked to the fredl shaft (g). This state is shown in FIG. Furthermore, if an overcurrent flows through the circuit in the closed state shown in FIG.
c) is activated, the engagement between the friddle 01 and the latch (29) is released, and the friddle 4 rotates clockwise around the friddle shaft (to) and is latched to the stopper shaft (31). Since the connection point of the upper link aη crosses the line of action of the actuation spring (c) when the fredle O is pressed, the toggle link mechanism H is bent by the spring force of the actuation spring (c), and the crossbar (2)
Automatic shutoff is performed in conjunction with each pole. This state is shown in FIG.

Next, the behavior of the arc that occurs when the circuit breaker interrupts the current will be explained.

Now, when the movable contact (9) and the fixed contact (6) are in contact, the power is transferred from the power source side to the solid conductor (5).
, fixed contact (6), movable contact (9) and movable conductor (8)
It is supplied to the load side via sequentially. In this state, when a large current such as a short circuit current flows through this circuit, the movable contact (9) is separated from the fixed contact (6) as described above. At this time, an arc (3 forces) is generated between the fixed and movable contacts (6) and (9J), and the fixed and movable contacts (6),
(9) An arc voltage is generated between 5 and 5. This arc voltage increases as the separation distance of the movable contact (9) from the fixed contact (6) increases, and at the same time the arc (3) The arc plate 0 is pulled and expanded by the magnetic force, so it rises further. In this way, the arc current reaches the current zero point, extinguishes the arc, and completes the interruption. However, This injected significant arc energy will eventually escape completely out of the vessel in the form of thermal energy, but it will transiently increase the temperature of the gas within the vessel, which in turn will reduce the gas pressure. This caused serious drawbacks such as deterioration of the insulation inside the circuit breaker, power supply short-circuit accidents due to an increase in the amount of sparks emitted to the outside of the circuit breaker, and destruction of the circuit breaker itself.

Furthermore, it is an object of the present invention to provide a switch in which the legs of the arc generated between the contacts do not leave the contacts at the initial timing of current cutoff, and the legs of the arc do not sag excessively, so that the arc is cooled from an early stage.

An embodiment of the present invention will be described below based on the drawings. Fourth
The figure is a side view showing one embodiment of a movable contactor used in a switch according to the present invention, and FIG. 5 is an assembled ufj diagram of FIG. 4. In the figure, the same parts as in FIGS. 1 to 8 are designated by the same reference numerals. In FIGS. 4 and 5, (7) is a movable contact, a movable conductor (8), a movable contact (9),
It is composed of a pressure reflector (50), an arc travel path (90; provided at the tip of the movable conductor (8), and a commutation protrusion 00a.The pressure reflector (bOj is a movable contact (
9) and an insulating material or high-resistance material surrounding the movable contact (9) and the arc traveling path (90), leaving only the side where the commutation protrusion 0 special is located out of the entire circumference of the arc traveling path iao+. This is an arc control member made of metal. The arc traveling path (901 is formed for the purpose of causing the arc to travel in a predetermined direction, and is provided on the end face of the part where the end originates from the movable contact (9) and protrudes toward the arc extinguishing plate aa side. In Fig. 5, the arc travel path (90) is externally constructed with the movable conductor (8), but it is constructed by fixing a good conductor piece different from the movable conductor (8) to the movable conductor (8). The movable contact (9) may be fixed to the movable conductor (8) by brazing or caulking, and the pressure reflector I0) may be fixed to the movable conductor (8) by using adhesive or by using rivets. Fixing by caulking, fixing by mold insert molding, fixing by fitting, and fixing by heat caulking using plastic can be considered, but fixing can be done by any method. Note that the fixed contact (4) is also configured in the same manner.

Next, the operation will be explained using FIGS. 6 to 8. now,
When a large accident ↑L flow occurs, the movable contact (9) and fixed contact (6) begin to separate according to the operation explained in the conventional example,
Immediately after the accidental incoming lightning occurred, an arc (3
21 occurs. Next, move the movable contact (7) @Figure 7, Figure 8.
As shown in the figure, the poles are opened repeatedly, but as shown in Figure 8, the legs of the arc (32) are finally connected to the commutation protrusion QOIII.
Transfer to the terminal. The principle of operation during this time will be explained below.

The arc +321 generated between the movable contact (9) and the fixed contact (6) is caused by the arc (3-foot leg) because the pressure reflector (50) is made of a high-resistance material as described above. It is impossible to expand, and when the positive column is narrowed down by increasing the back pressure on the surface of the pressure reflector (50) with the explosive force of the arc itself, the change created by the arc extinguishing plate α made of magnetic material such as iron. Under the influence of the distorted magnetic field, which attracts and drives the arc-extinguishing plate towards zero, the voltage of the arc between the movable contact (9) and the fixed contact ((1) rises rapidly. by the way,
On the other hand, since the pressure reflector (50) is closed on the opposite side of the arc extinguishing plate σΦ with respect to the movable contact (9) and the fixed contact (6),
'Even if the arc voltage increases, the arc +3Z can move in the direction in which the pressure reflector (50) is closed, and it will inevitably start moving in the arc travel path aLl[1 direction. During this time, the commutation projections 0α) on the movable and fixed sides, which are located at the same level as the movable contact (9) and the fixed contact (6), increase their potential as the arc voltage rises, causing an uneven surface of the commutation projection steel. The electric field will rise extremely, blowing out a high-temperature ionizing arc taZ, and forming a long arc taZ as shown in Figure 8.
, more arc t3Z is formed by the arc extinguishing plate (14)
This makes it possible to effectively cool the arc (3 forces) and suppress the internal pressure generated in the container (3) due to the arc (321). 31 from the movable contact (9) and the fixed contact (6) to the arc travel path 00), unnecessary contact wear can be reduced.

FIG. 9 is a side view showing another embodiment of the movable contactor used in the switch according to the present invention. That is, in the embodiment shown in FIG. 9, a plurality of commutation protrusions 0[1 are installed to cope with the wear of the commutation protrusions 0[l[l] due to the arc (three audiences) after commutation.

In addition, in the above explanation, the movable contact (7) and the fixed contact (
4) both have a pressure reflector (50) and an arc travel path (
90) and the case where the commutation protrusion α is provided has been described, but the case where it is provided only on either one is also possible.

Furthermore, similar effects can be obtained even when the present invention is applied to an electromagnetic repulsion contact that can be opened by electromagnetic repulsion.

As described above, according to the present invention, it is possible to prevent insulation deterioration inside the switch, power short-circuit accidents due to an increase in the amount of sparks emitted to the outside of the switch, and destruction of the switch main body, thereby increasing safety and making it possible to manufacture the switch at a low cost. , it has various effects such as low contact consumption and can contribute to resource saving.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing a conventional circuit breaker, FIGS. 2 and 3 are explanatory diagrams of the operation of FIG. 1, and FIG. 4 is an example of a movable contact used in the switch according to the present invention. FIG. 5 is an assembly drawing of FIG. 4, FIGS. 6 to 8 are explanatory diagrams of the operation of the opener according to the present invention, and FIG. It is a side view which shows another Example of the movable contactor conveniently used for a closure. In the figures, the same parts in each figure are given the same reference numerals, (1) is the cover, (2) is the base, (3) is the container, (
4) is a fixed contact, (5) is a fixed conductor, (6) is a fixed contact, (7) is a movable contact, (8) is a movable conductor, (9) is a movable contact, and Q [with] is an arc extinguisher. room, 0xun is the arc extinguishing plate, OG is the side plate, (321 is the arc, 紫 is the pressure reflector, (90) is the arc running path, and 00fl is the diversion probe. Agent: Patent Attorney Haku Kuzuno - Chapter Figure 3 Figure 4 Figure 5 @ Figure 6 Area 9

Claims (3)

[Claims] (1) A fixed contact consisting of a fixed conductor and a fixed contact attached to one end of the fixed conductor, a movable conductor and a movable contact attached to one end of the movable conductor opposite to the fixed contact. A movable contact, an arc extinguishing chamber for extinguishing an arc generated when the fixed contact and the movable contact are opened, and a small portion of the fixed contact and the movable contact on at least one of the fixed conductor and the movable conductor. The fixed contact and the movable contact, except for an arc travel path provided from either one to the end on the arc extinguishing chamber side, and at least one of the fixed contact and the movable contact and the arc travel path. A pressure reflector is provided that covers one of the surfaces facing the contact, the pressure reflector is made of an insulating material or a high-resistance metal material, and the end surface of the arc travel path on the arc extinguishing chamber side is A switch characterized in that a commutation protrusion is formed substantially perpendicular to the arc running path and transfers the arc to the end face. (2) The switch according to claim (1), wherein a plurality of commutation protrusions are provided. (3) The switch according to claim (1) or (2), wherein the movable contact is configured to open by electromagnetic repulsion from the fixed contact.