JPS58169716A - Electromagnetic switching device - 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 present invention relates to an electromagnetic switchgear, and in particular can alleviate damage caused by generated arcs and improve its durability, and can also prevent deterioration of opening performance due to a decrease in resistance between grids. The present invention relates to an improvement of the arc box.

A conventional electromagnetic switchgear of this type has a structure as shown in FIGS. 1 to 5. Namely.

In Figures 1, 2, and 6, (1) shows an arc box for arc extinguishing made of heat-resistant material, and a grid (2) made of magnetic metalwork 9 and a commutator plate (8) are shown. The arrangement is fixed according to the number of phases of the electrical circuit to be opened and closed. (4) is a crossper, (6) is a town Ilh contact, (6) is a movable contact attached to one end of the movable contact (5), (7)
Ha town! 1111 Contact presser, (8) is presser spring support, (
9) is a contact spring, and light is a stopper. The above contact spring (9) is connected to the lower part of stopper 4 and the presser spring support (8)
A pressure is fixed between the lower end of the
8) The upper end of the aluminum contact holder (7) and the upper surface of the movable contact holder (6) and the lower surface of the moving contact holder (γ) are in contact with each other when assembled.α111 Electric The upper part of the insulator (Pace 91) is fixed with a screw terminal.

4 is a U-shaped fixed contact f'L which is screwed onto the upper surface of the terminal, and a fixed contact () is attached above the fixed contact. (b) is an arc launch fixed to this fixed contact.

The movable contact is connected to a built-in well-known electromagnetic drive device via a movable contact spring (9).

Such contact mechanisms are provided symmetrically with respect to the A-m cross section, and are arranged corresponding to the number of phases of the electrical circuits that open and close in the direction orthogonal to the plane of the paper.

FIG. 2 is a perspective view schematically showing the main parts of FIG. 1, such as the commutation plate (8), the movable contact (6), and the movable contact (6).

If you enlarge the fixed contact 0 @, fixed contact -, and arc runner (b) in Figure 1, you will see Figure 3 (
a) It looks like (1)).

In such an electromagnetic switchgear, when fixed contact α4 and iiJ working contact (11'
6) to the commutation plate (8), while the other end is
Transfers from fixed contact - to arc launch (b). The other end of the transferred arc moves toward the end on the arc runner (B), and finally the vertical part of the arc runner (B) and the commutator plate (3) facing this The arc is extinguished by the grid (2) in between.

By the way, a conventional electric grid having the shape shown in FIG. 4 which performs such an opening and closing operation has been used, and the arc generated in this grid has the following tendency. In the same figure, s ”at arc current.

1. If the current shown in the grid (2) is represented by the electric current (n) flowing in the grid (2), the arc is driven in the side direction of the grid (2) by the field a created by this electric current (tIt1g). Become. Therefore, in this conventional configuration, the heat of the arc deflected to the side is 19
, Damage to the inner wall surface of the arc box was evident at about 4 seconds close to the side edge of grid (2).

Furthermore, in the arc box (1) of the conventional electric switchgear, the arrangement of the grids (2) forces close arrangement as shown in the WIs diagram, and the creepage distance between the grids (2) is small, and this rounding When the load current is repeatedly switched on and off, the insulation resistance between the grids (2) decreases significantly due to the heat of the arc, which results in the inability to shut off the grid.

In addition, the arc box (1
) The configuration of the arc box (1
) The protruding arm part of the grid (2) is inserted into the hole in the top wall of the grid (2) and its tip is bent, and the grid (2) is fixed and suspended from the arc box (1). However, the side ends of the grid (2) are simply inserted into the inner wall of the arc box (1), and therefore the arc box (1) of the grid (2)
It has been difficult to expect stable breaking performance because the positioning of the grid is uncertain and the grid spacing cannot be maintained constant.

In view of the above-mentioned points, the present invention suspends the grid on the top wall of the arc box, forms the side end t1 of the grid on the inner wall 11iK of the arc box, inserts it into the next part, and positions the cough grid. By carving #l on the inner side wall of the grid located between the recesses of the arc box to increase creeping insulation resistance, the above-mentioned drawbacks can be avoided.

Therefore, the present invention will be described with reference to the embodiment shown in FIG. 2
)teeth.

Its side end is inserted into the n9 recess (1b) previously formed on the inner wall surface of the arc box (1) and the n1 grid (2) is inserted.
There is no positioning.

Therefore, the grid (2) is firmly fixed in a predetermined position on the inner and fourth sides of the arc box (1), and since the grid spacing can be fixed at one time, stable interrupting performance can be expected. be able to.

By providing the t7ts upper shaft recess 11 (1t+),
Since the effective wall thickness of the inner surface of the arc box that is exposed to the arc increases, the fire resistance of the arc box increases accordingly.

Historically, the arc box (1) has a recess (1).
b) Groove θC on the inner wall surface between the grids (2) located in between
) is carved, and as shown in the enlarged view in Figure 6 (C), an arc (to) is formed between the grids (2), and when (IC), both sides of the groove are formed. The arc (b) does not reach the walls and the bottom of the groove, and these parts do not come into direct contact with the arc. Then, when the load current is repeatedly opened and closed many times, the degree of decrease in insulation resistance on the inner surface of the arc box (1) is significantly smaller than that of the conventional one shown in Fig. 5. Become. For this reason, on the inside wall of the arc box when opening and closing many times,
It can effectively prevent the rapid deterioration of the breaking performance due to the insulation deterioration of 70%.

It goes without saying that the cross-sectional shape and number of the grooves (1 (+7)) can be appropriately selected as necessary.

As described above, by incorporating the present invention, it is possible to securely position and attach the grid to the arc box,
In addition, since it can increase creeping insulation resistance between grids, it can improve the fire resistance of electromagnetic switchgear, and
This has the effect of stabilizing the interrupting performance.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of a conventional electromagnetic switchgear, Fig. 2 is a schematic diagram showing the commutator plate shown in Fig. 1, and Fig. 5 (1) is a perspective view of the commutation plate shown in Fig. Fig. 3('b) is a plan view schematically showing the arc runner shown in Fig. 3(a).
), Figure 4 is a perspective view of the grid shown in Figure 1, Figure 5 (a) * (b) is the
Fig. 1 shows a cross-sectional view and a longitudinal sectional view of the arc box, and Fig. 6 shows the main points of the electromagnetic switchgear according to the embodiment of the present invention, and Fig. 6 (IL) shows the arc box. The cross-sectional view of the box, Figure 6 (1)) is its longitudinal cross-sectional view, Figure 6 (10).
) is an enlarged view of part C in FIG. 6 0). (1): Arc box (1b): Recess (1a): Groove (2) Nigerid (8); Commutation plate
(6): Movable contact); Fixed contact Note that the same reference numerals in the drawings indicate the same or equivalent parts. Agent: Han Kuzuno - Figure 1, Figure 2, 110', Figure 3, Figure 4, Figure 5, Showa Year, Month, Day 2, Title of the invention: Electromagnetic Switching S.3, Relationship with the person making the amendment: Patent Part 4 to applicant name Hitoshi Katayama, agent number 54 Claims of the specification subject to amendment 11 Detailed description of the invention column,
and Drawing 6, contents of amendment (1) The claims of the specification are amended as shown in the attached sheet. (The statement "resistance reduction" on page 1, line 18 of the 2N specification is amended to "reduction in creepage line resistance." (3) Drawings 1 and 5 are amended to reflect the short boat. 7. Attachments List of documents (1) Claims after amendment (2) Drawings 21 2
A document stating the scope of claims after amendment The end portion is inserted into a recess formed on the inner wall surface of the arc box to position the grid, and a groove is carved on the inner wall surface between the grids located between the recesses of the arc box. A brazing magnetic switchgear characterized by increased creeping resistance. Figure 1

Claims (1)

[Claims] The 'fc' current generated between the movable contact and the fixed contact is transferred between the commutator plate and the arc launch, and is extinguished by a grid placed between them. In the electromagnetic switching device, the side end of the grid suspended from the top wall of the arc box is also formed on the inner wall surface of the arc box and inserted into the next curved part to position the grid, and the grid is positioned at the top of the arc box. An electromagnetic switchgear in which # is engraved on the inner wall surface between the grids located between the recesses to increase creeping insulation resistance.