JPS59180929A - 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 switch referred to in this invention is
In particular, it refers to containers such as circuit breakers, current limiters, and electromagnetic switches, which typically produce arcs within small containers.

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

Figures 1 to 3 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 base (2) constitute a container (3). (4) is a fixed contact, which has a fixed conductor (5) and 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,
It has a movable conductor (8), and one end thereof has a movable contact (9) facing the fixed contact (6). ach is a movable contact device, and Qυ is a movable arm, which is fixed to the crossbar @ and is configured to open and close at the time of each pole gap. (C) is an arc extinguishing chamber in which the arc extinguishing plate α→ is held by the side plate αυ. α・
is a toggle link mechanism, with an upper link (171) and a lower link (
18). One end of the upper link θ is attached to Freddle θ9, and the other end is attached to one end of the lower link 0 mark.

■Connected by ◇. The other end of the lower link (G) is connected to the movable arm α◇ of the movable contact device 00. (a) is a raised-type operating handle, and (b) is an operating spring, which is suspended between the axis Qυ of the toggle link mechanism a6 and the above-mentioned operating handle (a). (C) and (C) are thermal and electromagnetic tripping mechanisms, respectively, and when activated, the trip bar (C) is rotated counterclockwise by the bimetal (C) and movable core Q force, respectively. . The handle is a latch whose one end is locked to the tripper (7) and the other end is locked to the flapper (7).

When the operating handle (A) is tilted to the closing position with the fredl α9 locked in the latch (a), the toggle link mechanism αQ extends, the shaft Qη is locked in the fredl OO, and the movable contact (9
) is connected to the fixed contact (6). This state is shown in FIG. Next, tilt the operating handle (A) to the open position,
The toggle link mechanism QfG is bent to separate the movable contact (9) from the fixed contact (6), and the movable arm α→ is locked to the fredl shaft ■. This state is shown in FIG. Additionally, if an overcurrent flows through the circuit in the closed state shown in Figure 1, the thermal trip mechanism (c) or electromagnetic trip mechanism (c)
is activated, the engagement between the fredle (19) and the latch (4) is released, and the fredle a= rotates clockwise around the fredle shaft (7) and is locked to the stopper shaft (3υ).

The connection point of Freddle αω and upper link α is the above-mentioned operating spring (
In order to cross the line of action of (c), the toggle link mechanism αQ is bent by the spring force of the operating spring bracket, and each pole is interlocked with each other by the crossbar (6) to perform automatic shutoff. This state is the 8th
It is a diagram.

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 source side to the fixed conductor (5).
), fixed contacts (6), movable contacts (9) and movable conductors (8)
) is sequentially supplied to the load side. 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) is generated between the fixed and movable contacts (6) and (9), and the fixed and movable contacts (6) and (
9) An arc voltage is generated between the two. This arc voltage is
As the separation distance of the movable contact (9) from the fixed contact (6) increases, it rises, and at the same time, the arc (32) is attracted and expanded by magnetic force in the direction of the arc extinguishing plate σ. , further increases. In this way, the arc current reaches a current zero point, the arc is extinguished, and the interruption is completed. However, although this injected significant arc energy eventually escapes completely out of the vessel in the form of thermal energy, it temporarily increases the temperature of the gas within the limited vessel, and This will cause the gas pressure to rise rapidly.

This has resulted in 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.

It is an object of the present invention to eliminate the above-mentioned drawbacks of the conventional switch and to provide a switch that cools the arc 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 the movable contactor used in the switch according to the present invention, and FIG. 5 is an exploded view of the assembly of FIG. 4. In the drawings, the same parts as in FIGS. 1 to 8 are designated by the same reference numerals. In Figures 4 and 5, (7) is a movable contact provided at the tip of the movable conductor (8), movable contact (9), pressure reflector (50), and movable conductor (8). It is composed of an arc traveling path (100). The pressure reflector (to) has a movable contact (9) and an arc traveling path (1).
An arc control member made of an insulating material or a high-resistance metal material that surrounds the movable contact (9) and the arc travel path (100), leaving only the arc extinguishing plate 0 side out of the entire circumference of the 0. It is. The arc traveling path (ioo) is formed for the purpose of causing the arc to travel in a predetermined direction, and its end starts from the movable contact (9), projects smoothly toward the arc extinguishing plate α side with a certain radius of curvature R, and is connected to the movable conductor. (8) This is the part that curves smoothly to the back. In Figure 5, the arc running path (100)
is configured to be integral with the movable conductor (8), but a good conductor member different from the movable conductor (8) may be fixed to the movable conductor (8). In addition, the movable contact (9) is connected to the movable conductor (
8) is fixed by brazing or caulking, etc., and the pressure reflector (50) is fixed to the movable conductor (8) by adhesive, by caulking using rivets, or by mold insert molding. , fixing by fitting, or even fixing by hot caulking using plastic, but any method may be used for fixing. 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 an accidental large current occurs, the movable contact (9) and fixed contact (6) begin to open according to the operation explained in the conventional example, and immediately after the decimal large current occurs, an arc e-no occurs as shown in Figure 6. do. Next, the movable contactor (7) repeatedly opens to the states shown in Figs. 7 and 8, but as shown in Fig. 8, it finally forms an arc (the three legs are arc running paths). ioo).The principle of operation during this time will be explained below.

The arc (32) generated between the movable contact (9) and the fixed contact (6) is caused by the legs of the arc (82) since the pressure reflector (5Φ is made of a high resistance material as described above) cannot be expanded, the positive column is narrowed down by the explosive force of the arc itself creating back pressure on the surface of the pressure reflector (50), and the variable distortion magnetic field created by the arc extinguishing plate q made of magnetic material such as iron. As a result, the arc between the movable contact (9) and the fixed contact (6) (three voltages rise rapidly). The reflector CΦ is a movable contact (9) and a fixed contact (6)
Since the opposite side of the arc extinguishing plate a→ is closed, even if the arc voltage increases, the arc (32)
cannot move in the direction in which the arc is closed, and the arc travel path (10
The movable contact (9) begins to move without stopping in the direction of
) and the fixed contact (6), the legs of the arc (3) are detached. The arc (82) originally has the property of sticking to corners, ends, and discontinuous points of the member, but the arc traveling path (100
) are formed very smoothly, so they move sequentially according to the above-mentioned driving force. In this way arc (32)
The legs eventually move to the back of the arc travel path (100). The arc (3) that has finally reached the back side of the arc running path (100) blows out arc 2) in the vertical direction from the ml, forming a long arc (3) as shown in Fig. 8, and the arc extinguishing plate θ
→It becomes possible to bring more arcs (3) into contact, and the arc (32) can be effectively cooled and the internal pressure generated in the container (3) due to the arc (g) can be suppressed. 'At the beginning of the cage flow cutoff, the arc (3) is connected to the arc traveling path (
100), unnecessary contact wear can be reduced.

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 (
100), but it may be provided only on either side. 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 8 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 exploded view of FIG. 4, and FIGS. 6 to 8 are explanatory diagrams of the operation of the switch according to the present invention. In the figures, the same parts are given the same numbers, (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, 0 is an arc extinguishing chamber, a → is the arc extinguishing plate, 062 is the side plate, (820 is the arc, (to) is the pressure reflector, (ioo)
is the arc travel path. Agent Patent Attorney Shin Kuzuno - Figure 3, Figure 4, Figure 5, Figure 6, Figure 7

Claims (2)

[Claims] (1) A fixed conductor and a t attached to one end of the fixed conductor.
A fixed contact consisting of a fixed contact, a movable contact consisting of a movable conductor and a movable contact attached to one end of the movable conductor opposite to the fixed contact, and separation of the fixed contact and the movable contact. an arc extinguishing chamber for extinguishing an arc that occurs when the arc is extinguished; and an arc extinguishing chamber provided in at least one of the fixed conductor and the movable conductor, extending from at least one of the fixed contact and the movable contact to an end on the arc extinguishing chamber side. pressure covering opposing surfaces of one of the fixed contact and the movable contact, excluding the arc travel path and at least one of the fixed contact and the movable contact and the arc travel path; a reflector, the pressure reflector is made of an insulating material or a high-resistance metal material, the arc traveling path protrudes smoothly with an arbitrary radius of curvature as it moves away from the fixed contact or the movable contact, and A switch characterized in that the movable conductor is formed smoothly up to the back side. (2) The switch according to claim (1), wherein the movable contact is configured to be opened by electromagnetic repulsion from the fixed contact.