JPH0340456B2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention is arranged near the main contacts of a DC electromagnetic contactor, and utilizes the magnetic blowing effect of a magnet to eliminate the arc generated between the contacts when the electromagnetic contactor is interrupted. The present invention relates to an arc extinguishing device that extinguishes an arc.

[Prior art and its problems]

In general, arc extinguishing devices for electromagnetic contactors of this kind are expected to have a small number of constituent parts, be easy to assemble, and be inexpensive, but this is not necessarily the case with conventional arc extinguishing devices. For example, the specifications of Utility Model Registration Applications Published 152031/1982 and 82021/1982 describe a magnet disposed near the contacts of an electromagnetic contactor, and a magnet from the magnet that is chained between the opposing contacts of the contactor. a pair of magnetic pole plates that intersect and drive an arc generated when the contactor is cut off in a predetermined direction, and the magnetic pole plates attract and integrate both ends of the magnet through engagement holes provided therein. An arc extinguishing device has been proposed. However, in order to implement the proposed arc extinguishing device, as shown in Figs. Two arc extinguishing chambers 1a are provided in the arc extinguishing chamber main body 1 of the arc extinguishing device, and a magnet device consisting of a magnet 2 and two magnetic pole plates 3 that are attracted to both ends of the magnet is inserted through the storage groove 1b. Arc extinguishing room 1
In order to prevent the magnet device from falling out of the storage groove 1b, the outer plate 3a that constitutes the magnetic pole plate is bent and its elastic force is used to store the magnet device in the storage groove 1b. It must be press-fitted and held. Furthermore, in order to increase the arc-extinguishing ability, it is necessary to bring the magnetic pole plate 3 as close as possible to the joining position of the movable contact 5 and the fixed contact 6, but in this case, the side of the magnetic pole plate 3 facing the contacts 5 and 6 must be If it is exposed, the arc 8 generated between contacts 5 and 6 at the time of breaking will tend to continue through the magnetic pole plate 3 as shown in FIG. Magnetic flux 7 from the pole to the S pole
The direction of the arc 8 and the direction in which the arc 8 is attracted to the magnetic pole plate 3 are almost parallel, so that the magnetic flux 7 and the arc 8
Since the two do not interlink with each other, the breaking performance of the electromagnetic contactor deteriorates significantly. In order to prevent such a situation, it is necessary to arrange an insulating plate 4 extending further outward than the magnetic pole plate 3 on the side facing the contacts 5 and 6 of the magnetic pole plate 3.

As mentioned above, the application for registration of utility model was published in 1983-152031.
In addition, when implementing the arc extinguishing device proposed in the specification of 1987-82021, the number of parts constituting the arc extinguishing device is significantly large, and the magnetic pole plate consisting of multiple plates must be welded or brazed. The work of adding an insulating plate 4 to the magnet device consisting of the magnet 2 and the magnetic pole plate 3 and storing it in the arc extinguishing chamber 1a via the storage groove 1b is also quite cumbersome, economical and workable. It cannot be avoided that it is inferior to.

[Purpose of the invention]

The purpose of the present invention is to eliminate the drawbacks of the conventional device described above, to reduce the number of parts of an arc extinguishing device having a magnetic blowing effect without impairing arc extinguishing performance, and to be simple in structure, workable, and economical. The objective is to provide an excellent arc extinguishing device.

(Summary of the Invention) According to the present invention, the above object is to provide an arc extinguishing chamber body molded with synthetic resin and having an arc extinguishing chamber disposed corresponding to the arrangement position of the main contact of a DC electromagnetic contactor; The arc extinguishing chamber main body is equipped with a magnet device consisting of a magnet attached to the arc extinguishing chamber and a magnetic pole plate that is attracted and held by the magnet. In an arc extinguishing device that extinguishes an arc by using a magnetic blowing effect, an insulating part of the magnetic pole plate with respect to the main contact and a supporting part of the magnet are provided inside the arc extinguishing chamber of the arc extinguishing chamber body. The magnetic pole plate of the magnet device is inserted into the gap formed integrally with the main body and formed between the insulating part and the wall of the arc-extinguishing chamber from the upper part of the arc-extinguishing chamber main body, and the magnet is A magnetic pole plate is attached to the magnet support part from above the arc extinguishing chamber main body so that the magnetic pole plate is attracted to the magnet, and a cover plate for fixing and holding the magnet device is arranged above the magnet device of the arc extinguishing chamber main body. It is characterized by

[Embodiments of the invention]

FIG. 3 shows an example of a DC electromagnetic contactor equipped with the arc extinguishing device of the present invention. A direct current electromagnetic contactor is constructed by providing a spare space at the center pole so that a b contact for adding electric braking can be placed as required.

In FIG. 3, a two-point movable contact 10 having contacts 5 at both ends is fixed to a movable core 13 that is disposed opposite to an E-shaped fixed core 14 to which an operating coil 15 is attached. A movable contact support 12 molded with a synthetic resin is coupled thereto. An external contact terminal 17 is connected to a fixed contact 11 having a contact 6 opposite to a contact 5 of the movable contact 10 . The contacts 5 and 6 of the movable contact 10 and the fixed contact 11 are arranged so as to cover the opening/closing area, and a cylindrical magnet 2 and a magnetic pole plate 3 attracted to both ends thereof are fixed therein. The arc-extinguishing chamber main body 1, which is designed to interlink the arc-extinguishing magnetic flux between the contacts 5 and 6, is fixed to the case 18 of the electromagnetic contactor together with the fixed contact 11. The arc-extinguishing chamber main body 1 is molded with synthetic resin, and as shown in FIGS. 4 to 6, a magnet support portion 1d and a magnetic pole plate insulating portion 1c are integrally formed inside the arc-extinguishing chamber. 1a is arranged between the partition wall 1m of the arc extinguishing chamber 1a and the wall 1h of the arc extinguishing chamber main body 1, which is parallel to the direction of the axis of the magnet support part 1d, for discharging gas generated during arc extinguishing. A 1g hole is provided.

A magnet device in which a cylindrical magnet 2 has both ends attracted by magnetic pole plates 3 can be easily mounted on the arc extinguishing chamber main body 1 as described above as follows. That is, in the arc-extinguishing chamber main body 1, a gap 1e that is formed between the wall 1h of the main body 1 forming the arc-extinguishing chamber 1a or the partition wall 1m of the arc-extinguishing chamber and the magnetic pole plate insulating part 1c and penetrating vertically is provided with a gap 1e as shown in FIG. As shown in the figure, the magnetic pole plate 3 of the magnet device is inserted from above through an insertion opening formed in the arc extinguishing chamber body, and the magnet 2 is supported by the magnet support portion 1d. At this time, the magnetic pole plate 3 is attracted to the magnet 2 and falls off downward by being locked to the outer periphery of the end surface of the magnet 2 via a small-diameter boss 3a provided above the surface in contact with the magnet 2. is prevented. Further, on the inner surfaces of the outer wall 1h of the arc extinguishing chamber main body and the partition wall 1m, which form the gap 1e into which the magnetic pole plate 3 is inserted, there are two parallel surfaces as shown in FIG.
A book rib 1f is provided along the inner surface to the end of the gap 1e, and a magnetic pole plate 3 is inserted into the gap 1e.
By pressing against the end face of the magnet 2, the small-diameter boss 3a is securely locked to the outer periphery of the end face of the magnet 2, and the magnetic pole plate 3 is pressed between the two ribs 1f.
A relatively large-diameter boss 3b provided at the lower part of the magnetic pole plate 3 is clamped, thereby restricting left and right displacement of the magnetic pole plate 3.

Further, for the magnet device disposed in the arc extinguishing chamber 1a as described above, a non-magnetic metal plate, for example, having engaging protrusions 9a at the four corners and engaging notches 9b on both sides as shown in FIG. The cover plate 9 covers the magnet device insertion opening formed in the upper part of the arc extinguishing chamber main body 1 as shown in FIG. 8, thereby preventing the magnet device from moving upward. At that time, in order to fix the cover plate 9 to the arc extinguishing chamber body 1, first, as shown in FIG. The eaves 1 formed on the arc extinguishing chamber partition wall 1n by making it smaller than b
Lock the engagement protrusion 9a on one side of the cover plate 9 with m, push the opposite side in the direction of arrow P in the figure to bend the cover plate 9, and then apply a light force in the direction of arrow Q in the figure. is added to lock the engagement protrusion 9a on that side to the eaves 1n formed on the partition wall 1m on that side, and the engagement notch provided on the side of the cover plate 9 that coincides with the direction of the magnetic pole plate 3. By engaging the notch 9b with the protrusion 3c on the upper side of the magnetic pole plate 3, the cover plate 9 is easily and securely fixed to the arc extinguishing chamber main body 1, and therefore the magnet device is fixedly held in the arc extinguishing chamber 1a. . In this case, when the cover plate 9 is formed from a non-magnetic metal plate as described above, the polarity display symbol of the cylindrical magnet covered by the cover plate 9 can be confirmed from the outside by locating the location of the display symbol on the cover plate 9. It is preferable to provide two peepholes 9c at certain locations.

Furthermore, in the arc extinguishing device of the present invention, contacts 5 and 6
Since the cover plate 9 is constructed so that it is not affected by the arc generated during the process, the cover plate 9 can be made of transparent synthetic resin. This is a good idea because it makes it easier.

〔Effect of the invention〕

As described above, according to the present invention, in an arc extinguishing device that extinguishes the scum generated between the main contacts when opening and closing a DC magnetic contactor by the magnetic blowing action of a magnet, the An insulating part of a magnetic pole plate with respect to the main contact and a support part of the magnet are formed integrally with the arc extinguishing chamber main body, and the magnetic pole is formed in a gap formed between the insulating part and the wall of the arc extinguishing chamber. The plate is inserted from the upper part of the arc extinguishing chamber main body, and the magnet is attached to the magnet support part from the upper part of the arc extinguishing chamber main body, and the magnetic pole plate is attracted and attached to the magnet, and the magnet device of the arc extinguishing chamber main body is installed. A cover plate for fixing and holding the magnet device is disposed above, and the insulating part of the magnetic pole plate with respect to the main contact, the supporting part of the magnet, and the gap into which the magnetic pole plate is inserted are connected to the arc extinguishing chamber body. By integrally forming the arc extinguishing chamber, the number of parts can be reduced without compromising arc extinguishing performance, and workability is improved as the magnet and magnetic pole plate can be installed by simply throwing them in from the top of the arc extinguishing chamber body. An arc-extinguishing device with high arc-extinguishing performance can be obtained by fixing the arc-extinguishing magnet device in the arc-extinguishing chamber as close as possible to the main contact that generates the arc, making it easier to assemble electromagnetic contactors. The effect is expected to be both high performance and high economic efficiency.

[Brief explanation of drawings]

Figures 1 and 2 are schematic diagrams illustrating the configuration of a conventional arc extinguishing device and the reason why insulation is required for the magnetic pole plate in the arc extinguishing chamber, and Figure 3 is an electromagnetic structure equipped with the arc extinguishing device of the present invention. Schematic vertical cross-sectional view of the contactor, Figures 4 and 5
6 and 6 are schematic diagrams of the upper surface of the arc extinguishing chamber main body of the present invention and a vertical cross section taken along lines AA and B-B in FIG. 4, and FIG. 7 is a magnet device and a magnet of the arc extinguishing chamber. FIG. 8 is a perspective view showing the relationship with the support part, FIG. 8 is a mutual relationship diagram when the cover plate shown in FIG. 9 is fixed to the magnet device insertion port of the arc extinguishing chamber, and FIG. 9 is a perspective view of the cover plate. . 1... Arc-extinguishing chamber main body, 1a... Arc-extinguishing chamber, 1c...
Magnetic pole plate insulation part, 1d... Magnet support part, 1e... Air gap, 1f... Rib, 1h... Arc extinguishing chamber wall, 1m...
Arc-extinguishing room bulkhead, 1n...Eave, 2...Magnet, 3...
...Magnetic pole plate, 3a...Locking boss, 3b...Positioning boss, 3c...Engagement protrusion, 5...Movable contact, 6...Fixed contact, 9...Cover plate, 9a...For locking Projection, 9b... Engagement notch, 9c... Magnet polarity display symbol exposure window provided on the cover plate.

Claims (1)

[Claims] 1. An arc extinguishing chamber body molded with synthetic resin and having an arc extinguishing chamber located corresponding to the location of the main contacts of the DC magnetic contactor, and a magnet attached to the arc extinguishing chamber of this arc extinguishing chamber body. and a magnetic pole plate that is attracted and held by the magnet, and an arc extinguishing device that extinguishes the arc generated between the main contacts when the DC magnetic contactor is opened and closed by using the magnetic blowing action of the magnet. In the arc-extinguishing chamber body, an insulating portion of the magnetic pole plate and a support portion of the magnet for the main contact are formed integrally with the arc-extinguishing chamber body, and the insulating portion and the arc-extinguishing portion are integrally formed with the arc extinguishing chamber body. The magnetic pole plate of the magnet device is inserted from the top of the arc-extinguishing chamber main body into the gap formed between the chamber wall and the magnet is attached to the magnet support part from the top of the arc-extinguishing chamber main body. An arc extinguishing device characterized in that a magnetic pole plate is attached to the magnet by adsorption, and a cover plate for fixing and holding the magnet device is disposed above the magnet device of the arc extinguishing chamber main body.