JPH0145065Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to an improvement of a tripping device for a circuit or disconnection, particularly an electromagnet with an oil dash.

[Prior art]

FIG. 1 is a side sectional view showing a conventional circuit breaker tripping device. In the figure, one end of a movable iron piece 1 is rotatably supported by a yoke 2. The opening 3a of the cylinder 3 is connected to the movable iron piece 1.
It is supported by the yoke 2 so as to face it. The cylinder 3 is filled with brake oil 4 and also accommodates a plunger 5. A lid 6 made of a magnetic material is attached to the opening 3a of the cylinder 3. A return spring 7 is installed between the plunger 5 and the lid 6 and functions to constantly press the plunger 5 downward in the figure. The electromagnetic coil 8 is wound around the outer periphery of the cylinder 3, and is excited by the circuit current flowing through the circuit and disconnector.

Next, the operation of this device will be explained. Now, when an overcurrent flows through the circuit or disconnector, the electromagnetic coil 8 is excited, and the plunger 5 moves toward the lid 6 against the viscous resistance of the brake oil 4 and the spring force of the return spring 7. When the plunger 5 comes into contact with the lid 6, the plunger 5 → lid 6 → movable iron piece 1 → yoke 2 → plunger 5
The movable iron piece 1 is attracted to the lid 6 by the magnetic circuit. By this suction of the movable iron piece 1, the engaging part 1a of the movable iron piece 1 rotates in the direction of arrow A, and drives the well-known circuit breaker or disconnection mechanism 9 to pull out the circuit breaker or disconnector. . When a short-circuit current (large current) flows, the movable iron piece 1 operates instantaneously without overlapping the operation of the plunger 5, and drives the tripping mechanism 9 to trip and disconnect the circuit breaker.

Since the conventional circuit and disconnection tripping devices are configured as described above, the suction force is weak and the tripping time is long, which causes problems in disconnection. In addition, the suction power of the DC cutter was very difficult to adjust due to its weak suction force.

[Summary of the idea]

This idea was made to eliminate the drawbacks of the conventional ones, by forming the yoke into a U-shape and bending the movable iron piece into an L-shape to reduce the gap between the yoke and the yoke. The object of the present invention is to provide an oil dart type electromagnetic tripping device for a breaker with a large suction force.

[Example of idea]

An embodiment of this invention will be described below with reference to the drawings. In Fig. 2, one end of the movable iron piece 1 is connected to the yoke 2.
It is rotatably supported by. Movable iron piece 1
The other end 1b is bent at a right angle into an L shape and faces the U-shaped one leg 2a of the yoke 2. The rest of the configuration is the same as that in FIG. 1, so the same reference numerals as in FIG. 1 are given and the explanation will be omitted.

In the present invention having such a structure,
In the state shown in FIG. 2 when the electromagnet is open, the tip of the bent portion 1b of the movable iron piece 1 is close to the monopod 2a of the yoke 2, so the gap between the lid 6 of the cylinder 3 and the movable iron piece 1 is large. However, the attraction force to the movable iron piece 1 due to the excitation of the electromagnetic coil 8 increases. 8th
The figure is a characteristic diagram in which the gap between the lid 6 and the movable iron piece 1 is plotted on the horizontal axis and the suction force is plotted on the vertical axis.The broken line is that of FIG. 1, and the solid line is that of the present invention. As is clear from this, the present invention can increase the suction force against the gap.

[Effect of idea]

As described above, according to this invention, the yoke is formed into a U-shape and the movable iron piece is bent into an L-shape to reduce the gap between the yoke and the yoke, thereby creating an inexpensive electromagnetic tripping device with a large attractive force. Therefore, it has the effect of making it possible to perform adjustments with a high degree of precision not found in conventional methods.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional tripping device, FIG. 2 is a sectional view showing an embodiment of this invention, and FIG. 3 is an explanatory diagram of its operation. In the figure, 1 is a movable iron piece, 1a is an engaging part, 1b is a bent part, 2 is a yoke, 2a is a yoke leg, 3 is a cylinder, 4 is a brake oil, 5 is a plunger, 6 is a lid, 7
8 is a return spring, 8 is a winding, and 9 is a tripping mechanism. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A movable iron piece whose one end is rotatably supported by a yoke, a cylindrical container-shaped cylinder supported by the yoke so that the outer surface of the bottom faces the movable iron piece, and a cylinder that slides into the cylinder. a cylindrical plunger removably housed, a return spring housed within the cylinder and mounted between the plunger and the inner surface of the bottom of the cylinder, an opening in the cylinder so as to seal brake fluid contained within the cylinder; In a circuit breaker equipped with a lid attached to a cylinder and an electromagnetic winding wound around the outer periphery of the cylinder, the yoke is formed into a U-shape, and the tip of the movable iron piece is formed into an L-shape. A circuit breaker tripping device characterized in that when the electromagnet is opened, one end of the yoke and the L-shaped portion of the movable iron piece face each other to reduce a gap. .