JPS634525A - Immediate return type electromagnetic trip 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] Elephant milk upper part 1~light 1 The present invention relates to an improvement of an instant return type electromagnetic trip device.

2. Description of the Related Art A conventional instant return type circuit breaker is shown in FIG. 4, in which a cylindrical pipe 1 is fitted into an L-shaped magnetic frame (yoke) 8, and an electromagnetic coil 11 is attached to the outer periphery of the cylindrical pipe 1. A plunger 2 is attached to the cylindrical pipe 1, and a plunger 2 that moves up and down along the tube is combined with a spring 4, and further contains oil 3, and the plunger 2 has a hole 7 that can be passed through the plunger 2 vertically along the tube 1. A ball valve 6 is installed on the edge of the through hole 70, and a stopper rod is attached to prevent the balls of the ball valve 60 from flying out. Other tube 1
It has a magnetic pole piece 5 on its upper end face, and an armature 9 facing the L-shaped yoke 8 and biased by a spring 1o.

Thus, when a current flows through the electromagnetic coil 11, the electromagnetic force acting on the plunger 2 increases, and the plunger 2 is attracted and raised against the spring 4. At this time, the oil 5 tries to flow through the fixed through hole 7 drilled into the plunger 2, but the oil flow pushes down the first valve valve 6 and it comes into close contact with the upper surface of the through hole 7, thus blocking the flow. Plunger 2 moves slowly and rises one by one due to resistance.

Next, when the electromagnetic coil 11 becomes de-energized and the electromagnetic force disappears, the plunger 2 descends due to its own weight or the force of the spring 4, and the ball valve 6 is pushed up by the action of hydraulic pressure, and the upper end of the through hole 7 is opened. The oil circulation is improved, the resistance of the oil acting on the plunger 2 is reduced, and the plunger 2 quickly descends and returns.

The electromagnetic tripping device having the plunger 2 braked by oil in this way is used in a motor circuit, etc., so that it does not respond to short-term overcurrents such as starting current, and also prevents starting and stopping of the motor. If the elevator is not operated repeatedly, the passage time of the excess flow will be accumulated and the response will be completed. It is desirable that the electromagnetic part shown in Figure 4 be used horizontally (or vertically) with respect to gravity, since gravity acts on the plunger 2. If the characteristics change even with a slight change in the installation angle, the ball valve 6 shown in Figure 5 is used to prevent weak flow from climbing up the inclination of the hole 70 and through hole 7. Therefore, it has a very complicated operation, and even if it is closed, if it is AC, the electromagnetic camera will cause a leak of oil, making it unstable. There are plans to prevent this from happening by providing a push spring 15 on the valve 6 or magnetizing the ball valve so that it can easily come into close contact with the ball valve, but if the electromagnetic coil 11 is de-energized and the ball valve 6 opens, it will create resistance. This is very inconvenient, and it is difficult to adjust the strength of the push spring and magnetization to prevent this, making it unsuitable for mass production.

Mouse 1 - A popular customer for the miner J! In consideration of these points, the present invention is designed to provide a stable instant-return type tripping device that performs accurate valve action through repeated trial manufacture and experiments.

ff1) In the present invention, the lower part of the plunger 2 is slightly shaved to make the diameter narrower and stepped, and the cylindrical body 15, which is a non-magnetic material, is lightly fitted into the constant diameter portion and connected to the ball valve 6! ! It is tied at 12 and can be freely slid up and down.

By doing so, it is possible to obtain an instant return type tripping device that ensures reliable valve action even with a weak oil flow force and has stable characteristics regardless of the mounting angle.

EXAMPLE Next, an example apparatus of the present invention will be explained with reference to FIG.
For convenience of explanation, equivalent parts in FIG. 4 are indicated using the same reference numerals. An electromagnetic coil 11 is attached to the outer periphery of the cylindrical tube 1, and a plunger 2 that moves up and down along the cylindrical tube 1 is combined with a spring 4. Oil 5 is also housed in the plunger 2. A hole 7 that can be penetrated vertically along the axis is bored, and a ball valve 6 made of a non-magnetic material is housed in the edge of the through hole 70. In addition, a magnetic pole piece 5 is provided on the upper end surface of the cylindrical tube 1, and an armature 9 that is biased by a spring 10 to an L-shaped yoke 8 is provided opposite thereto.

Furthermore, in the present invention, the lower end of the nib plunger 2 is slightly shaved to make the diameter slightly narrower, and a non-magnetic material is connected to the bottom center of the cylindrical body 15 to make the outer diameter of the plunger 2 the same as that of the plunger 2. The ball valve 6 is connected to the ball valve 6 by brazing with a non-magnetic wire 12 that passes through a through hole 7, and the ball valve 6 is opened and closed according to the vertical movement of the cylinder 15. Reference numeral 14 designates a plurality of oil discharge holes provided at the bottom of the cylindrical body 15.

Next, the electromagnetic tripping device according to the present invention will be explained.
Now, when an overcurrent flows through the electromagnetic coil 11, the electromagnetic force acting on the plunger 2 increases and the plunger 2 is attracted, but since the cylinder 13 is a non-magnetic material, it is not attracted, and the plunger 2 and the cylinder tube The ball valve 6, which is connected to the flow of oil through the gap 1 and the through hole 12 by the connecting wire 12, is pulled and the through hole 7 is reliably closed.

Next, when the electromagnetic coil 110 is no longer energized, the attractive force disappears and the plunger 2 tries to return to the return spring 4, causing the cylinder 13 to fully open the ball valve 6 due to the flow, and the oil flows through the through hole 7.
and returns rapidly through the discharge hole 14.

Effects of the Invention In this simple line removal device of the present invention, the Eriball valve 6 is operated by the cylinder 15 which is operated by being sufficiently affected by the flow of oil, so the valve action can be performed reliably even with a weak flow force, and it is easy to install. An immediate return large trip device with stable characteristics regardless of the angle can be replaced.

First, in the present invention, the plunger moves slowly when attracted by electromagnetic force, but can move rapidly when returning.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of an embodiment of a row release device according to the present invention, and FIGS. 2, 5, and 4 are side sectional views of different embodiments of a conventional tripping device. In the figure, 2 is the plunger, 5i! oil, 4 is a return spring, 5 is a magnetic pole piece, 6 is a ball valve, 7 is a through hole, 8 is a yoke, 9 is an armature, 10) a mechanical spring. 11 is an electromagnetic coil, 12 is a connecting wire, and 15 is a cylindrical body. 14 is an oil drain hole.

Claims (1)

[Claims] (1) In an electromagnetic trip device in which a combination of a plunger, a return spring, and oil are housed in a cylindrical tube around which an electromagnetic coil is wound, and the tube is fitted into an L-shaped magnetic frame, a portion of the lower part of the plunger is removed. A non-magnetic cylindrical body is allowed to slide freely in this part by narrowing the diameter thereof, and the ball valve and the cylindrical body are connected vertically with a non-magnetic connecting line that passes through the through hole of the plunger. An instant return type electromagnetic tripping device characterized in that it operates slowly when the electromagnetic coil is energized and quickly returns when the electromagnetic coil is de-energized.