JPS6381712A - 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 [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] As shown in FIG. 8, a contact device includes a fixed contact 11 provided on a fixed contact plate 12 and a movable contact 14 provided at one end of a movable contact 14 that is movable with respect to the fixed contact plate 12. The contact portion 10 includes a contact point 13. An arc extinguishing grid device 3 is disposed at one end of the fixed contact plate 12, and the contact portion 10
The arc generated at the time of opening is introduced into the arc-extinguishing grid device 3 and arced to tl'/arc. That is, the arc extinguishing grid device 3 is disposed at a position facing the tip ya portion 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 arc is energized by the Lorentz force, which is the interaction between the arc current of the arc generated in the contact portion 10 and the magnetic field generated around the movable contact 14. It is. The arc-extinguishing grid device 3 has a plurality of grid plates 21 made of a conductive material arranged approximately parallel to each other at a distance from each other, and divides the arc generated when the fixed contact 11 and the movable contact 13 open. !48? Instead, the arc is extinguished.

As mentioned above, since the conventional contact device requires the arc extinguishing grid device 3 having a relatively A241 feature,
There was a problem that assembly was not easy.

[Objective of the Invention 1 The present invention has been made in view of the above points, and its main purpose is to increase the arc voltage and extinguish the arc by stretching 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 1 (Sliding) A contact device according to the present invention includes a fixed contact plate provided with a fixed contact, and a movable contact that forms a contact portion together with the fixed contact, and is substantially perpendicular to the closing direction of the contact portion. A movable contact is formed in an elongated shape in the longitudinal direction and is energized in the longitudinal direction; A maximum of 151! The yoke has a shape that includes a bridge piece that magnetically shorts the legs at a position farther from the fixed contact than the pole distance, and an insulator layer that covers at least the entire inner peripheral surface of the yoke. However, one end edge of the yoke in the longitudinal direction of the movable contact is at least in the direction in which the arc is energized by the Lorentz force generated between the magnetic field generated around the movable contact and the arc generated at the rWI pole of the contact. It extends to a position farther from the fixed contact than the outer periphery of the drive coil, and part of the insulator layer is interposed between the fixed liquid, the α plate, and the drive coil, and the movable contact By applying the magnetic field generated around the arc to the arc through the yoke, 7
This is to ensure that the magnetic field is sufficiently stretched and that the magnetic field generated by the drive coil does not impede the movement of the movable contact.

(Example 1) In the following description, as shown in FIG. 3, an example will be shown in which the contact device of the present invention is used in a molded circuit breaker, but the present invention is not limited to this. In addition, although up and down and left and right in FIG. 3 are used as terms to define directions, these terms do not limit the mounting direction.

f: tS As shown in FIG. 3, a contact device is disposed at a fixed position within the housing 1. The contact device includes a fixed contact plate 12 having a fixed contact 11, a movable contact 14 having a movable contact 13 which together with the fixed contact 11 forms a contact part 10.
, a pair of drive coils 15 disposed on both sides of the fixed contact plate 120 with the fixed contact 11 sandwiched between them, a yoke 16 made of a magnetic material and disposed astride both drive coils 15; A Jl cap 17 is provided as an insulating layer covering the peripheral surface.

The fixed contact plate 12, as shown in FIGS. 1 and 2,
A fixed contact 11 is provided on the upper surface of the intermediate portion in the left-right direction.

The left half of the fixed contact plate 12 acts as an arc traveling plate. A T-shaped arc traveling plate may be fixed to the upper surface of the left half of the fixed contact plate 12 so that the upper surface is in fixed contact and the upper surface of the bridge 11 is in contact with the road surface.

This drying allows the lower end of the arc generated as the contact =, ffl5lO opens to run along the fixed contact plate 12 or the arc traveling plate. There are fixed contacts and outer plate 12 on both sides immediately after the fixed contact @12.
U with a center front perpendicular to the longitudinal direction of the U that opens downward.
A curved drive coil 15 is arranged to sandwich the fixed contact 11. Further, the central axes of both drive coils 15 are located on the same straight line.

The right end of the drive coil 15 is integrally continuous with the right end of the fixed contact plate 12, and the other end of the drive coil 15 is integrally continuous with the terminal plate 18. The upper end of the drive coil 15 is located lower H than the position of the movable contact 13 when the movable contact 13 is farthest from the fixed contact 11. That is, the distance from the fixed contact 11 to the upper end of the drive coil 15 is set smaller than the maximum opening distance of the contact sio. The left end of the terminal plate 18 extends to the left of the fixed contact plate 12, and a terminal screw 19 is screwed into the left end to form the terminal 2.

Between the drive coil 15 and the fixed contact plate 12, and on both sides of the left end of the R4 constant contact plate 12, there are partition pieces that are both leg pieces of an insulating cap 17 formed in a U-shape that is bent downward. 17a is provided, and the upper surface of the right end of the fixed contact plate 12 is covered by a cover piece j7b extending from the MiI & cap 17. Further, a flange piece 17c is extended on the outer gi surface of the insulating cap 17.

The flange pieces 17c are formed along the outer peripheral surface of the drive coil 15 and at both left and right ends of the insulating cap 17. This insulating cap 17 completely covers the fixed contact plate 12,
At the right end, the movable contact 14 moves from the closed position to the maximum open position i! ! The contact portion 10 is formed so as to be covered with insects. The insulating material forming the insulating cap 17 is an insulating material that generates thermal decomposition due to arc heat. In other words, this pyrolysis gas produces 7
- It cools down the arc and quickly extinguishes the arc. Such insulating materials include polymethylpentene resin, polymethyl methacrylate resin, polybutylene resin, etc.
It is known that these resins tend to generate gas, particularly hydrogen gas, as a thermal decomposition product during a thermal decomposition reaction.

A yoke 16 made of a magnetic material is provided on the outer periphery of the insulating cap 17.
are mated. That is, the yaw 216 has a cross-sectional shape in which a pair of leg pieces 16a disposed on both sides of the movable contact 14 and a bridging piece 16b that magnetically short-circuits the upper ends of both leg pieces 16a are continuous and downward. It is formed in a U-shape with an opening.
The right end portion of the yoke 16 is arranged above the drive coil 15. Therefore, the yoke 16 covers the contact portion 10 over the entire length of the movement range of the movable contact 14. The left end portions of the yoke 16 and the insulating cap 17 extend to the left n portion of the fixed contact plate 12. Like this M! When the insulating cap 17 isolates the contact part 10 and the drive coil 15, the fixed contact -χ By covering a part of the plate 12, the I of the contact portion 10 is
This prevents the arc generated at the IFi pole from moving to unnecessary parts such as the drive coil 15 and the fixed contact plate 12.

(Operation) The operation will be explained below. When the contact and f portion 10 is in the r\1 other state, the fixed contact plate 12 and the movable contact 14 are arranged substantially parallel to each other, and the fixed contact plate 12 is disposed.

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 a gap between the fixed contact plate 12 and the movable contact 14. A strong repulsive force acts instantaneously and the contact portion 10 opens. In addition, a magnetic field is also generated around the drive coil 15 due to the current flowing through the drive coil 15, and this magnetic flux φ passes near the center axis of both coils 15 in the area sandwiched between the two drive coils 15, and in the other areas. In some parts, the yoke 16 is used as a magnetic path. Therefore, when a large current passes through, the movable contact 14 is biased in both directions by the Lorentz force, which is the interaction between the current flowing through the movable contact 14 and the magnetic field around the drive coil 15. That is, the movable contact 14 is instantaneously moved upward by the magnetic force between the movable contact 14 and the fixed contact plate 12 and the Lorentz force between the movable contact 14 and the drive coil 15.

After that, the trip device etc. will be activated and mechanically possible! I! /
The J contactor 14 is separated from the fixed terminal plate 12 by 3cm
Extinguish 4 times and boil 10. An arc is generated between the fixed contact 11 and the movable contact 13. As described above, a magnetic field is generated around the movable contact 14, and since the yoke 16 is disposed to surround the movable contact 14, the magnetic flux φ around the movable contact 14 is As shown in Figure (b), it passes through the yaw 216. In response to the Lorentz force caused by the interaction between this magnetic field and the arc 9, the arc 9 is urged toward the left in FIG. 4(a). When the central part of the arc 9 swells in this way, the upper part of the arc 9 expands by 7 points in the left and right direction in FIG.
- arc 9 runs, so as shown in Figure 5, this arc 9
Similar to the magnetic field generated around the movable contact 14, the magnetic field generated around the center of the 7-ri 5) is similar to the magnetic field generated around the movable contact 14. tr14 is biased to the left in Figure (a), and at the same time the upper part of 7-k 9 is biased upward. In this way, the center part of the arc 9 is biased to the left, and the upper part of the arc 9 is biased upward, causing the center part of the arc 9 to be stretched vertically. The arc voltage is obtained and the arc current is current limited. Therefore, the arc 9 can be extinguished without using an arc extinguishing grid device. In addition, the magnetic flux φ generated by the drive coil 15
1, the outer peripheral portion of the drive coil 15 passes through the inside of the yoke 16 as shown in FIG. Even if the drive coil 15 is located above the drive coil 15
The magnetic flux φ1 generated around the movable contact 14 and the magnetic flux φ generated around the movable contact 14 do not go in opposite directions, and the magnetic flux φ around the drive coil 15 prevents the movement of the movable contact 14. There is no. That is, the movable contactor 14 rapidly separates the movable contact 13 from the fixed contact 11, rapidly increases the arc voltage, and suppresses the arc current.

In addition, due to arc heat when arc 9 occurs, insulating cap 1
Pyrolysis gas is generated from the resin forming 7.
The arc 29 is cooled by this pyrolysis gas, a high arc voltage is obtained, and the arc 9 can be extinguished even more quickly.

(Embodiment 2) In the above embodiment, the insulating cap 17 was disposed all around the inner peripheral surface of the yoke 16, but in this embodiment, the insulating cap 17
As shown in FIG. 7 and FIG. 7, an insulating cap 17 is interposed only between the fixed contact plate 12 and the drive coil 15, and epoxy resin powder is baked over the entire circumference of the surface of the yoke 16. forms an insulating coating. For the insulating cap 17, the same insulating material as in the first embodiment is used.

(Embodiment 3) In the above embodiment, an arc extinguishing grid device is not provided, but the arc extinguishing grid device 3 shown in FIG. 8 or FIG.
may be placed at a position corresponding to the left end of the fixed contact plate 12 which acts as an arc traveling plate. In this case,
'' The effect of extinguishing the arc 9 is further enhanced by the synergistic effect with each of the embodiments. In particular, even if the central part of the arc 9 moves toward the arc extinguishing gourd device 3, the arc 9
Due to the magnetic field generated around itself, the 7-grid 9 is urged toward the arc extinguishing grid device 3, and the arc 9 is
The upper part of the arc can be pulled upward, so the arc 9
is sufficiently elongated, and the arc 9 can be sufficiently introduced into the arc extinguishing grid device.
As a result, a high arc voltage is obtained and the effect of limiting the arc current becomes sufficient.

[Effects of the Invention 1] As described above, the present invention includes a fixed contact plate provided with fixed contacts, a movable contact forming a contact portion together with the fixed contacts, and a long shape in a direction substantially perpendicular to the opening/closing direction of the contact portion. A movable contact is formed in the direction of the operator and is energized in the operator's direction, and a movable contact is disposed on both sides of the fixed contact plate with the fixed contact sandwiched therebetween. f, a pair of drive coils that apply a Lorentz force in the direction of opening, a pair of leg pieces made of magnetic material and arranged on both sides of the contact, and a fixed liquid for the movable contact, and a maximum opening from α. The yoke has a shape that includes a bridge piece that magnetically shorts the legs at a position farther from the fixed contact than the pole distance, and an insulator layer that covers at least the entire inner peripheral surface of the yoke. However, one edge of the movable contactor's yaw in the operator's direction is allowed! I! J
A position that is farther from the fixed contact than at least the outer periphery of the drive coil 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 opens. A part of the insulator is interposed between the fixed contact plate and the drive coil, and as mentioned above, the magnetic field generated around the movable contact and the area around the arc itself are The Lorentz force of 4'p caused by the interaction between the magnetic field and the arc, which is generated in the Therefore, it has the advantage that the arc can be extinguished without using an arc extinguishing grid device. Further, since no arc-extinguishing grid device is 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, thereby increasing the arc extinguishing effect. Furthermore, since the magnetic flux of the magnetic field generated at the outer circumference of the drive coil is bypassed via B-9'e, the movement of the movable contact is not inhibited by the magnetic field around the drive coil, and the contact This has the advantage that the area can be opened rapidly.

[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 perspective view of the same as above, the Pt53 figure is a partially cutaway side view showing an example of a molded circuit breaker similar to the above, Figures 4 and 5 are operation explanatory diagrams of the same, and Pt5a is an embodiment of the present invention. 7 is a perspective view of the same, and FIG. 8 is a sectional view 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 drive coil,
16 is a yoke, 16a is a leg piece, 16b is a bridge piece, and 17 is an insulating cap. Agent Patent Attorney Ishi 1) Long 710--Contact part 11...Fixed liquid, Hiro 12--[-■ Constant contact, if, #1 15... Drive coil Fig. 2 Fig. 3 Fig. 4 Figure 6

Claims (2)

[Claims] (1) A fixed contact plate provided with a fixed contact, and a movable contact that forms a contact part together with the fixed contact, 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 longitudinal direction. A pair of drive coils are arranged on both sides of the fixed contact plate with the fixed contact in between, and apply a Lorentz force to the movable contact in the direction of opening the contact when the contact is in the closed state. A pair of legs made of a magnetic material are placed on both sides of the contact, and a pair of legs are magnetically connected between the legs at a position where the distance from the fixed contact is farther than the maximum opening distance from the fixed contact of the movable contact. The yoke has a shape having a short-circuiting bridging piece, and an insulating layer that covers at least the entire inner circumferential surface of the yoke, and one end edge of the yoke in the longitudinal direction of the movable contact is formed around the movable contact. In the direction in which the arc is energized by the Lorentz force generated between the magnetic field generated at A contact device characterized in that a part of the body layer is interposed between a fixed contact plate and a drive coil. (2) The contact device according to claim 1, wherein the insulating layer is formed of an insulating material that generates pyrolysis gas by arc heat.