JPS6312516Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to an arc extinguishing chamber for an airborne electromagnetic contactor.

In general, an air magnetic contactor equipped with an arc extinguishing chamber is required to be easy to maintain and inspect its contact parts, and to be easy to replace the contacts and arc extinguishing chamber from time to time. It is desired that the arc chamber can be easily attached and detached during replacement without having to be removed for maintenance and inspection. However, none of the conventional ones satisfactorily meet these demands.

An example of a conventional arc extinguishing chamber is shown in FIG. In order to support the arc extinguishing chamber 1, holders 4a, 4b and a hinge 5 are provided on parts of the arc horns 2a, 2b, which are the constituent parts of the arc extinguishing chamber 1, and on a part of the blow-out iron plate 3, which is arranged in parallel in the front and back. It is being
On the other hand, the electromagnetic contactor main body (not shown) to which the arc extinguishing chamber 1 is attached has clips 6a, 6b with spring properties corresponding to the holders 4a, 4b, and a shaft 7.
is provided. At the time of attachment, the holders 4a, 4b can be stably attached by the spring force of the clips 6a, 6b. In addition, the holder 4a can be removed by rotating the arc extinguishing chamber 1 counterclockwise around the shaft 7.
At the same time, the holder 4b moves in the direction of the arrow B and locks the clip 6a, and at the same time, the holder 4b moves in the direction of the arrow B and locks the clip 6b.
This can be done relatively easily by releasing the respective restraints and then pulling it upward as shown by arrow C. The disadvantage of this arc extinguishing chamber 1 is that, as is clear from the figure, the arc extinguishing chamber 1 must be removed during maintenance and inspection of the contact part 8, and for this purpose, storage space must be secured near the inspection work. However, it has the disadvantage of complicating the work.

Another conventional example shown in FIG.
Attachment to an electromagnetic contactor (not shown) is performed by tightening bolts 13 through through holes 12a provided on one side of the blown-out iron plate 12. When inspecting the contact portion 14, it is necessary to loosen the bolt 13, rotate the arc extinguishing chamber 11 counterclockwise to the state shown by the chain line, and then tighten the bolt 13 again to maintain the position. In this case, the contact part 14
As mentioned above, the inspection can be carried out only by rotating the arc extinguishing chamber 11, but it is necessary to tighten and loosen the bolt 13 twice from the installation position to the inspection position and then to the restoration. Moreover, in order to remove the arc extinguishing chamber 11, the bolt 13 must be completely removed, which is a disadvantage that the work is extremely troublesome.

The object of this invention is to eliminate the above-mentioned conventional drawbacks and provide an arc extinguishing chamber for an airborne electromagnetic contactor that can be easily attached and detached without having to be removed during maintenance and inspection of the contact portion.

According to this invention, the above purpose is to be mounted so as to cover the switching contacts of the airborne electromagnetic contactor at all times, and to rotate around the support shaft so as to expose the switching contacts during inspection or repair, or to support the contactor after rotation. In the arc extinguishing chamber that is removable from the shaft, the engaging portion of the arc extinguishing chamber with the support shaft is formed as a curved opening groove, and the curve of the opening groove is a part of a circular arc having the same diameter as the support shaft. a first fulcrum portion formed as a section;
Continuing with the first fulcrum part through a convex curve inside the groove, having the same diameter as the support shaft, and away from the center of the arc of the first fulcrum part when viewed from the center of gravity of the arc extinguishing chamber. It consists of a second fulcrum part formed as a part of a circular arc having a center at the position, and an opening that is continuous with the first and second fulcrum parts and is larger than the diameter of the support shaft. is achieved by being supported by the support shaft via the first fulcrum at the mounting position, and supported by the support shaft via the second fulcrum at a position rotated by a predetermined angle from the mounting position. .

Embodiments of this invention will be described in detail below based on the drawings. In FIG. 3, two blow-out iron plates 22 are attached so as to sandwich both sides of the arc-extinguishing chamber 21. Only the contact portion 25 is shown on the blow-out iron plate 22. A support shaft 23 provided on the electromagnetic contactor is shown.
A fulcrum 24 is provided which is rotatably supported by. As shown in FIG. 4, the fulcrums 24 are enlarged and have two locations, a first fulcrum 24a and a second fulcrum 24b, which are connected to each other and have an opening 24c having a dimension S larger than the diameter of the support shaft 23 diagonally upward. A fulcrum is provided. The fulcrum 24a is for fitting into the support shaft 23 to stably hold the arc extinguishing chamber 21 when the arc extinguishing chamber 21 is installed in a magnetic contactor, and the fulcrum 24b is for inspecting the contact portion 25. This is to stably maintain the arc extinguishing chamber 21 in the state shown in FIG. 6 through the process shown in FIG. 5. That is, the contact portion 25
In order to inspect the arc extinguishing chamber 21 in the direction of arrow P in
As you rotate the arc extinguishing chamber 2, you will reach the position indicated by the diagonal line.
Due to its own weight, the fitting with the support shaft 23 is at the fulcrum 24a.
It moves to the fulcrum 24b. When the arc extinguishing chamber 21 is continued to be rotated, the tip of the arc extinguishing chamber 21 reaches the floor surface 26 as shown in FIG. Become. Furthermore, if it becomes necessary to remove the arc extinguishing chamber 21 from the electromagnetic contactor, this can be easily accomplished by slightly lifting the arc extinguishing chamber 21 and pulling it out in the direction of the arrow R, as shown in FIG.

As is clear from the above, the arc extinguishing chamber 21 only needs to be rotated for maintenance and inspection of the contact portion 25, and the attachment and detachment of the arc extinguishing chamber 21 can be done by setting the arc extinguishing chamber 21 at an appropriate position during rotation. All you have to do is select, pull out, and insert.

FIG. 8 shows another embodiment of this invention, and the installation of the arc extinguishing chamber 21, the blow-out iron plate 22, and the electromagnetic contactor 27 is exactly the same as in the embodiment shown in FIG. The difference is that when inspecting the contact portion 25 as described above, the tip of the arc extinguishing chamber 21 is placed on the floor surface 26.
It was received and held by the electromagnetic contactor 27.
The reason is that a receiver 28 is provided in the holder 28. This is effective when, as shown in FIG. 9, when the electromagnetic contactor 27 is housed in the switchboard 29 and when the electromagnetic contactor 27 is pulled out from the operating position to the inspection position, there is a large difference in level from the floor surface. Note that the receiver 28 is the electromagnetic contactor 2
It can also be used as a drawer handle.

Although the above explanation has been made as an arc extinguishing chamber for an airborne electromagnetic contactor, it is a matter of course that this arc extinguishing chamber can be applied to an airborne electromagnetic contactor.

[Brief explanation of drawings]

Figures 1 and 2 are side views of different arc extinguishing chambers of a conventional aerial magnetic contactor, Figure 3 is a side view of an arc extinguishing chamber of an embodiment of this invention, and Figure 4 is a side view of the arc extinguishing chamber of an embodiment of this invention. Figures 5 to 7 are side views showing the removal process in Figure 3, and Figures 8 and 9 are aerial electromagnetic contacts showing examples of application of the arc extinguishing chamber according to this invention. It is a side view of a container. 21... Arc extinguishing room, 22... Fire-extinguishing iron plate, 23...
Support shaft, 24... fulcrum, 24a... first fulcrum,
24b...second fulcrum, 24c...opening, 28
……received.

Claims (1)

[Scope of utility model registration request] The extinguisher is normally attached to cover the switching contacts of the air magnetic contactor, and can be rotated around the support shaft to expose the switching contacts during inspection or repair, or can be removed from the support shaft after rotation. In the arc chamber, the engaging portion of the arc extinguishing chamber with the support shaft is formed as a curved opening groove, and the curve of the opening groove is a first groove formed as a part of an arc having the same diameter as the support shaft. a fulcrum part, which is continuous with the first fulcrum part through a convex curve inside the groove and has the same diameter as the support shaft;
and a second fulcrum part formed as a part of a circular arc having a center at a position distant from the center of the circular arc of the first fulcrum part when viewed from the center of gravity of the arc extinguishing chamber, and the first and second fulcrum parts. and an opening that is continuous with the support shaft and has a diameter larger than the diameter of the support shaft, and the dead weight of the arc extinguishing chamber is supported by the support shaft via the first fulcrum at the mounting position, and is rotated by a predetermined angle from the mounting position. An arc extinguishing chamber for an airborne electromagnetic contactor, wherein the arc extinguishing chamber is supported by the support shaft via a second fulcrum part.