JP2527789Y2 - Electromagnet device for overcurrent trip - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overcurrent tripping electromagnet device to be incorporated in a circuit breaker.

[0002]

2. Description of the Related Art In a circuit breaker using an electromagnet device for overcurrent trip using a dashpot, in order to match characteristics of different rated current values, the product of the current value (A) and the number of coil turns (T) is the same ( For example, it is set to 300 AT, and the instantaneous region is set to 800 to 1500% of the rated current value.) However, in the case where the product of the current value and the number of turns of the coil cannot be the same as in the case of the rated current of 125 A as shown in the table below, the number of turns is such that the instantaneous region becomes earlier. It was causing trouble. For this reason, in the prior art, the adjustment for slowing down the instantaneous region is performed by welding the magnetic body 22 to the yoke 21 and diverting a part of the magnetic flux of the dash pot 23 to the magnetic body 22 as shown in FIG.
There is a method in which the magnetic attraction force to the magnetic head 4 is reduced, or the armature spring 25 is strengthened so that the armature 24 does not operate in an instantaneous region.

[Table 1]

[0003]

However, in the case where the magnetic body 22 is welded to the yoke 21, the dashpot 23 and the coil 26 are assembled after the magnetic body 22 is welded to the yoke 21. 22 is an obstacle for assembling and not only requires time and effort to manufacture, but also cannot change the instantaneous area once set. Further, in the case where the armature spring 25 is strengthened, the instantaneous region can be changed by changing the armature spring 25, but the operation of the armature 24 is hindered. There is a problem that it may not operate.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a magnetic head provided at a position corresponding to a head of a dash pot fixed to a lower portion of an L-shaped yoke. A body is penetrated through the L-shaped yoke so that the distance between the body and the head of the dash pot is adjustable.

[0005]

The overcurrent tripping electromagnet device is to be incorporated into a circuit breaker, and when an excessive current flows through the coil, magnetic attraction acts between the head of the dashpot and the armature. When the armature is drawn to the dashpot, the armature activates a trigger to cut off the circuit. Further, a magnetic body is provided at the position of the L-shaped yoke corresponding to the head of the dash pot fixed to the lower part of the L-shaped yoke so as to penetrate the L-shaped yoke. Since the magnetic body can be incorporated after the assembly, the assembly becomes easy. In addition, by providing the magnetic material through the L-shaped yoke, a part of the magnetic flux at the head of the dashpot can be diverted to the magnetic material, and the magnetic attraction force to the armature is reduced to provide more accurate instantaneous power. The region can be set, and it can operate instantaneously at the time of excessive current, and can operate accurately even at the minimum tripping current value. Further, by changing the distance between the magnetic body and the head, it is easy to change the instantaneous region.

[0006]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. In FIG. 1, 1 is an L-shaped yoke, and 2 is the L-shaped yoke.
The dash pot 3 fixed to the lower part of the mold yoke 1 is a magnetic body provided at a position corresponding to the head 2a of the dash pot 2 of the L-shaped yoke 1. The magnetic body 3 is composed of a pin 4 with a head made of a magnetic material such as iron. The magnetic body 3 is penetrated from the outside of the yoke 1 through a through hole 5 provided at a position corresponding to the head 2a of the dashpot 2 of the yoke 1. The L-shaped yoke 1 is fixed to the inner surface of the yoke 1 with a push nut 6.
After the dashpot 2 and the coil 8 have been assembled, the magnetic body 3 can be assembled. As shown in FIG. 2, the magnetic body 3 is connected to the head 2a of the dashpot 2 by interposing a spacer 10 between the head of the pin 4 and the L-shaped yoke 1 and adjusting the amount of protrusion of the pin. The interval is adjustable. Further, the magnetic body 3 may be made of a male screw, and a tap may be formed in the through hole 5 of the yoke 1 so as to be adjustable.

An armature 7 is swingably supported in a recess at the upper end of the yoke 1. The armature 7 is attracted to the head 2a by the magnetic flux of the head 2a of the dashpot 2 generated when an excessive current flows through the coil 8. The circuit breaker is operated by operating a trigger of a circuit breaker (not shown). Reference numeral 9 denotes an armature spring for maintaining a space between the armature 7 and the head 2a of the dashpot 2.

The above-described structure is generated when an excessive current flows due to the magnetic member 3 provided at the position of the yoke 1 corresponding to the head 2a of the dashpot 2 fixed to the lower portion of the L-shaped yoke 1. A part of the magnetic flux of the head 2a of the dashpot 2 is divided into the magnetic material 3 and the product of the current value and the number of coil turns cannot be made the same depending on the rated current value. Even if the product of the current value and the number of turns of the coil is 375 AT and the instantaneous region is as fast as 550 to 750% of the rated current value, the magnetic material 3
As a result, the magnetic attraction to the armature can be reduced and the instantaneous region can be delayed, so that an accurate instantaneous region can be set, and there is no danger of tripping due to the starting power of the motor.

The magnetic body 3 is formed of a pin 4 with a head made of a magnetic material such as iron, and a through hole 5 provided at a position corresponding to the head 2a of the dashpot 2 of the yoke 1 is provided outside the yoke 1. The dash pot 2, the coil 8 and the like can be attached to the yoke 1 after the dash pot 2 and the coil 8 are fixed to the inner surface of the yoke 1 by using the push nut 6 so that the production is facilitated. further,
By changing the distance between the magnetic body 3 and the head 2a, it is easy to change the instantaneous region. Therefore, the rated current value at which the product of the current value and the number of coil turns can be the same is 50 A,
Even in the case of 00A or the like, the instantaneous region can be changed according to the starting current value of the motor. Also,
Since the armature spring 9 is not strengthened, the operation of the armature 7 can be accurately performed without obstructing the movement of the armature 7 even at the minimum tripping current value.

[0010]

[Effects of the Invention] As is clear from the above description, the present invention
Since the magnetic body can be attached to the yoke after the dashpot, the coil, and the like are assembled into the yoke, there is an advantage that the magnetic body does not hinder the work of assembling the dashpot, the coil, and the like, and the manufacture is easy. In addition, since the amount of magnetic flux generated at the head of the dashpot reaching the armature can be adjusted by a magnetic body provided so that the distance between the head and the dashpot can be adjusted by penetrating the L-shaped yoke, The current value can be accurately adjusted to a predetermined instantaneous region, and the instantaneous region can be easily changed. Further, since the armature spring is not strengthened, it can operate properly even at the minimum trip current value.
Further, the present invention is of great practical value as a solution to the problem of the conventional overcurrent tripping electromagnet device.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a side view showing a main part of the present invention.

FIG. 3 is a side view showing a conventional overcurrent tripping electromagnet device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 L-shaped yoke 2 Dash pot 2a Dash pot head 3 Magnetic body

Claims (1)

(57) [Scope of request for utility model registration] A magnetic body (3) is placed at the position of the L-shaped yoke (1) corresponding to the head (2a) of the dashpot (2) fixed to the lower part of the L-shaped yoke (1). An electromagnet device for overcurrent trip, characterized in that a gap between the dashpot (2) and the head (2a) of the dashpot (2) is adjustable so as to penetrate the yoke (1).