JPH0173722U - - Google Patents

Description

[Brief explanation of drawings]

Figures 1 to 8 are diagrams showing an embodiment of the arc extinguishing device for a magnetic contactor according to this invention. A cross-sectional view along the line, Figure 3 is a view taken in the direction of arrow B in Figure 1, and Figure 4 is a cross-sectional view along the line.
The figure is a vertical cross-sectional view of the main part in the middle of contact opening, and Figure 5 is the 4th section.
A sectional view taken along the line C-C in the figure, Fig. 6 is a vertical sectional view of the main part when the contact is completed, Fig. 7 is a sectional view taken along the line D-D in Fig. 6, and Fig. 8 is the main part. FIG. 9 is an exploded perspective view of main parts of another embodiment of the arc extinguishing device for an electromagnetic contactor according to this invention; FIG. 10 is a comparison diagram of arc residence time between the embodiment and a conventional device; FIG. 11 18 are diagrams showing an example of a conventional arc extinguishing device for an electromagnetic contactor, and FIG. 11 is a longitudinal cross-sectional view of the electromagnetic contactor.
12 is a sectional view taken along line E-E in FIG. 11, FIG. 13 is a view taken in the direction of arrow F in FIG. 11, FIG. G- in the diagram
16 is a longitudinal sectional view of the main part when the contact is completed, FIG. 17 is a sectional view taken along the line H-H in Fig. 16, and FIG. 18 is an exploded perspective view of the main part. 19th
The figure is a diagram of the breaking principle of the contact device, and FIG. 20 is an arc voltage waveform diagram with time on the horizontal axis and voltage on the vertical axis. 11: Fixed contact, 12: Fixed contact, 13: Magnetic pole plate, 14: Holder, 15: Movable contact, 16: Movable contact, 20: Contact device, 61: Arc extinguishing chamber, 6
2, 63, 64: Arc extinguishing grid, 63c, 64a
, 64c: Notch, 65: Insulating frame, 65a: Partition wall, 65c: Exhaust gas groove, 66: Insulating lid, 70: Arc extinguishing device.

Claims (1)

[Claims for Utility Model Registration] 1. A pair of fixed contacts, each of which has a U-shape and is spaced apart from each other and has a fixed contact on the opposite side and a magnetic pole plate fixed on the back side. , an arc extinguishing device attached to a contact device comprising a movable contact supported by a holder that is vertically slidable between opposing fixed contacts and having a movable contact for bridging and opening between the fixed contacts. The inner wall width of the arc extinguishing chamber that divides the contactor device into poles is wider than the inner wall width of the operating area of the movable contactor, and exhaust gas grooves are formed in both side walls constituting the arc extinguishing chamber and are open at the top. an insulating frame fixed to the insulating frame and positioned above the movable contact and having both ends close to both ends of the movable contact; flat arc extinguishing grids arranged in parallel at intervals perpendicular to each other;
The arc extinguishing grid is arranged on the outside of this plate-like arc extinguishing grid, and is formed in an L-shape with its tips facing inward, and has a notch at least on the upper edge of the outside, and a square window near the other bent parts. An arc extinguishing device for an electromagnetic contactor, comprising an arc grid and an insulating cover that is detachably attached to the insulating frame and closes an upper opening. 2. An arc extinguishing device for an electromagnetic contactor according to claim 1 of the utility model registration, characterized in that the L-shaped bending angle of the arc extinguishing grid is obtuse. 3. The arc extinguishing device for an electromagnetic contactor according to claim 1 of the utility model registration, characterized in that the L-shaped arc extinguishing grid has a notch at its leading edge.