JPS6381711A - Contactor - Google Patents

Abstract

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

Description

[Detailed description of the invention] 7fN1111 [Technical Field] The present invention relates to a contact device that is mainly used in molded circuit breakers and rapidly moves a movable contact when the contact is opened due to excessive current.

[Background Art J Generally, this type of contact device, as shown in FIG. 9 and FIG. It has a contact part 10 consisting of a movable contact 13 provided at one end. An arc extinguishing grid device 3 is disposed at one end of the fixed contact plate 12, and an arc generated when the contact portion 10 is opened is introduced into the arc extinguishing grid device 3 and extinguished. There is. That is, the arc extinguishing grid device 3 is disposed at a position facing the tip of the movable contact 14, and the movable contact 14 is formed in a long shape in a direction perpendicular to the opening/closing direction of the contact portion 10. Therefore, the contact part 10
The arc is urged toward the arc extinguishing grid device 3 by the Lorentz force, which is the interaction between the arc current of the arc generated and the magnetic field generated around the movable contactor 14. The arc extinguishing grid device rI13 is a device in which a plurality of grid plates 21 made of a conductive material are arranged approximately parallel to each other at a distance from each other, and divides and cools the arc generated when the fixed contact 11 and the movable contact 13 open. The arc is then extinguished.

As described above, the conventional contact device requires the arc-extinguishing grid device 3 having a relatively complicated structure, which poses a problem in that it is not easy to assemble.

[Object of the Invention] The present invention has been made in a manner similar to the above points, and its main purpose is to increase the arc voltage and extinguish the arc by elongating the arc sufficiently long. It is an object of the present invention to provide a contact device capable of extinguishing an arc without using an arc extinguishing grid device.

[Disclosure of the invention] (Structure) Connections related to the present invention? ! The device includes a fixed contact plate provided with fixed contacts, and a movable contact that forms a contact section together with the fixed contacts. a pair of legs made of a magnetic material and placed on both sides of the contact, and a pair of legs that are made of a magnetic material and placed on both sides of the fixed contact at a distance from the fixed contact that is farther than the maximum opening distance of the movable contact from the fixed contact. A yoke having a shape having a bridge piece that magnetically short-circuits between the yoke and an insulating layer covering at least the entire inner peripheral surface of the yoke, one end edge of the yoke in the longitudinal direction of the movable contact. It extends to at least one edge of the fixed contact plate in the direction in which the 7-terminal is biased by the Lorentz force generated between the magnetic field generated around the movable contact and the arc generated when the contact is opened. The arc is sufficiently stretched by applying the magnetic field generated around the movable contactor to the arc via the yoke.

(Example 1) In the following explanation, an example will be shown in which the contact device of the present invention is used in a molded circuit breaker, as shown in Fig. Although up and down and left and right are terms used to define directions, these terms do not limit the mounting direction.

As shown in FIG. 3, a contact device is disposed at a fixed position within the housing 1. As shown in FIG. The contact device includes a fixed contact plate 12 equipped with a fixed contact 11, a flexible BJ contact 14 equipped with a movable contact 13 that forms a contact section 10 together with the fixed contact 11, and a flexible BJ contact 14 made of a magnetic material and arranged on both sides of the flexible tjJs contact 14. The yoke 15 is formed into a substantially U-shape that opens downward by the provided leg piece 15a (see FIG. 1) and the bridging piece 15b that magnetically shorts the upper end of the leg piece 15a, and the inner part of the yoke 15. An insulating cap 16 is provided as an insulating layer covering the peripheral surface.

As shown in FIG. 1, the fixed contact plate 12 has the fixed contacts 11 provided on the upper surface of the intermediate portion in the left-right direction. fixed contact,
The left half of the outer plate 12 acts as an arc running plate. A T-shaped arc travel plate may be fixedly attached to the upper surface of the left half of the α plate 12. With this configuration, the lower end of the arc generated as the contact and α portions 10 open can run along the fixed contact plate 12 or the arc running plate. The right end of the fixed contact @12 is integrally continuous with the terminal board 17, and the terminal board 17 is formed wider than the fixed contact board 12. A stepped portion 18 has been formed. The terminal plate 17 is bent into a U-shape that opens to the left at the right end.
Passing below the fixed contact plate 12, the left end part is the fixed contact plate 12.
The terminal 2 is formed by screwing the terminal screw 19 into the left ra portion. An insulating cap 16 made of an insulating material is disposed between the step portion 18 and the terminal 2 with its lower edge abutting the terminal plate 17 below the fixed contact plate 12. The insulating cap 16 has a U-shaped cross section that opens downward, and is formed with outer flanges extending from both left and right edges and the lower edge.

This insulating cap 16 completely covers the fixed contact and α plate 12, and at the right end, the contact ff1 extends from the closed position of the contact part 10 to the maximum open position of the movable contact 14.
It is formed to cover Slo.

The insulating material forming the insulating cap 16 is an insulating material that generates pyrolysis gas due to arc heat. In other words, this pyrolysis gas cools the arc and quickly extinguishes it. Examples of such insulating materials include polymethylpentene resin, polymethyl methacrylate resin, and polybutylene resin, and it is known that these resins tend to generate gases as thermal decomposition products during thermal decomposition reactions, especially hydrogen gas. It is being A yoke 15 made of a magnetic material is fitted onto the outer periphery of the insulating cap 16. That is,
The yoke 15 has a pair of leg pieces 15a disposed on both sides of the movable contact 14 and a bridging piece 15b that magnetically shorts the upper ends of both leg pieces 15a.The yoke 15 has a cross-sectional shape that is open downward. It is formed in a U-shape. The yoke 15 covers the contact portion 10 over the entire moving range of the movable contactor 14, and the left edge of the yoke 15 and the insulating cap 16 extends to the left edge of the fixing liquid and the α plate 12. By interposing the insulating cap 16 between the α part 10 and the yoke 15 in this way, the arc generated when the contact part 10 is opened is prevented from transferring to the yoke 15. .

(Operation) The operation will be explained below. When the contact portion 10 is in the closed state, the fixed contact plate J2 and the movable contact 14 are arranged almost parallel, and currents in opposite directions flow through the fixed contact plate 12 and the movable contact 14. There is. Here, when a large current such as a short-circuit current passes through the contact section 10, a magnetic field generated by the current flowing through the fixed contact plate 12 and the movable contact 14 causes the fixed liquid, the α plate 12, and the movable contact 14 to During this time, a strong repulsive force momentarily acts and the contact portion 10 opens. Thereafter, a trip device or the like is activated to mechanically separate the movable contactor 14 from the fixed terminal plate 12. As the contact portion 10 opens, an arc is generated between the fixed contact 11 and the movable contact 13. As mentioned above, a magnetic field is generated around the movable contactor 14, and the LI
Since the yoke 15 is arranged to surround the T-moving contact 14, the magnetic flux φ around the moving contact 14 is as shown in FIG.
As shown in b), it passes through the inside of the yoke 15.

In response to the Lorentz force caused by the interaction between this magnetic field and the arm 29, the 7-piece is urged toward the left in FIG. 4(a). When the center of 7-ri 9 expands in this way, 7
- At the top of the rib 9, the arc 9
runs, the magnetic field generated around this arc 9, similar to the magnetic field generated around the movable contact 14, urges the center of the arc 9 to the left in Figure (a), and at the same time 7- This will force the upper part of the block 9 towards the direction. Like this 7-2
The center part of the arc 9 is biased to the left, and the upper part of the arc 9 is biased upward, so that the center part of the arc 9 is stretched vertically. The arc voltage is obtained and the arc current is current limited. Therefore, 7-9 arc extinguishing can be performed without using an arc extinguishing grid device.

Pyrolysis gas is generated from the resin forming the tube 16, and since the arc 9 is cooled by this pyrolysis gas, a high arc voltage can be obtained, and the arc 9 can be extinguished even more quickly. It is.

(Embodiment 2) In the above embodiment, the terminal plate 17 was folded back below the fixed contact plate 12, but in this embodiment, as shown in FIG. The fixed contact plate 12 and the right end portion of the terminal plate 17 are arranged on the same plane. The other configurations are the same as in the first embodiment.

(Embodiment 3) In the above embodiment, an insulating cap 16 was interposed between the periphery of the movable contactor 14 and the yoke 15, but in this embodiment, as shown in FIG. An insulating coating is formed around the entire circumference by baking epoxy resin powder or the like. Others (Embodiment 4) In this embodiment, as shown in Figure PtS7, one leg piece is bent inward at the left end of the yoke 15 to form a cooling piece 20. The cooling piece 20 is arranged at a distance above the left end of the fixed 7α plate 12 which acts as an arc traveling plate. Further, the portion of the yoke 15 except for the cooling piece 20 is coated with an insulating coating as in the third embodiment.

As a result of this borrowing, as shown in FIG. 8, the arc 9 generated due to the opening of the contact portion 10 comes into contact with the cooling piece 20 and is cooled, and the arc extinguishing effect of the arc 29 is enhanced. be.

(Embodiment 5) In the above embodiment, an arc extinguishing grid device is not provided, but the fixed contact plate 12 acting as an arc running plate of the ilv arc grid device 3 shown in @ Fig. 9 or Fig. 10 is used.
It may be placed at a position corresponding to the left end of. In this case, the effect of extinguishing the arc 9 is further enhanced due to the synergistic effect with the above embodiments. In particular, even if the central part of the arc 9 moves toward the arc extinguishing grid device 3, the arc 29 can be urged toward the arc extinguishing grid device 3 by the magnetic field generated around the arc 9 itself. In addition, since the upper part of the arc 29 is pulled upward, the arc 9 is sufficiently stretched, and the introduction of the arc 29 into the arc grid device 3 is ensured.

[Effects of the Invention] As described above, the present invention includes a fixed contact plate provided with fixed contacts, a movable contact that makes contact with the fixed contacts and forms an α part, and is arranged in a direction substantially perpendicular to the opening/closing direction of the contact parts. A movable contact that is formed into a long shape and is energized in the direction of the operator, a pair of legs made of magnetic material and placed on both sides of the contact, and the maximum opening distance of the movable contact from the fixed contact. The movable yoke has a bridge piece that magnetically shorts between both leg pieces at a position far from the fixed contact, and an insulating layer that covers at least the entire inner peripheral surface of the yoke. One end edge of the yoke in the operator's direction of the contact is located at least at the stationary contact in the direction in which the arc is urged by the Lorentz force generated between the magnetic field generated around the movable contact and the arc generated when the contact opens. It extends to one edge of the plate, and as mentioned above, due to the magnetic field generated around the movable contact and the Lorentz force, which is the interaction between the arc and the magnetic field generated around the arc itself, Since the arc can be energized and extended for a sufficiently long time, a sufficiently high arc voltage can be obtained, and the arc current can be suppressed, the arc can be extinguished without using an arc extinguishing grid device. It has the advantage of being Further, since the arc-extinguishing grid device a is not used, there is an advantage that assembly is easy. On the other hand, if an arc extinguishing grid device is used in combination, the arc can be reliably guided into the arc extinguishing grid device and the arc extinguishing effect can be enhanced.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of main parts showing Embodiment 1 of the present invention, and FIG.
The figure is a sectional view of the same as above, Figure 3 is a partially cutaway side view showing an example of a hardwire circuit breaker using the same as above, Figure 4 is an explanatory view of the operation of the same as above, and Figure f55 shows Example 2 of the present invention. 6 is a perspective view showing a yoke used in Embodiment 3 of the present invention; FIG. 7 is an exploded perspective view of essential parts showing Embodiment 4 of the present invention;
FIG. 8 is a sectional view similar to the above, and FIGS. 9 and 10 are sectional views showing a conventional contact device. 10 is a contact part, 11 is a fixed contact, 12 is a fixed contact plate, 1
3 is a movable contact, 14 is a movable contact, 15 is a yoke, 16
is an insulating cap. Agent Patent attorney Mr. Ishi 1) 710...Contact part 11...Fixed contact,? ! . Fig. 1 12...Fixed connection, ζ plate 13...
Movable contact 14...Movable contact 15...Yoke Figure 2 Tortoise 5 Figure 3 Figure 4 (b) Figure 5 Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] (1) A fixed contact plate provided with fixed contacts, and a movable contact that forms a contact part together with the fixed contacts, is formed into a long shape in a direction substantially perpendicular to the opening/closing direction of the contact part, and is energized in the pitching direction. A pair of legs made of a magnetic material are arranged on both sides of the contact, and a pair of legs are arranged between the two legs at a distance from the fixed contact that is farther than the maximum opening distance of the movable contact from the fixed contact. a yoke having a shape having a bridging piece that magnetically short-circuits a It is characterized by extending to at least one edge of the fixed contact plate in the direction in which the arc is energized by the Lorentz force generated between the magnetic field generated around the contact and the arc generated when the contact is opened. Contact device.