JPH09282983A - Electromagnetic operating apparatus for circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a closing mechanism and reduce a cost by arranging a breaking spring, in which energy is stored during a breaking operation of a plunger body, between the plunger body and an iron inside a closing exciting coil of a closing electromagnetic plunger. SOLUTION: A small-diameter head 7b is disposed at the tip of a plunger body 7. A head 8a having the same diameter as the outer diameter of the head 7b is provided in an iron 8. A breaking spring 4 consisting of a compression coil is put in a breaking spring disposing space 28 around the heads 7b, 8a of the body 7 and the iron 8 inside of a closing exciting coil 9 of a closing electromagnetic plunger 5. Both ends of the spring 4 abut against a step part 7a of the body 7 and a flange-like base 8b of the iron 8, respectively, wherein energy is stored during breaking. When the body 7 is attracted by the iron 8 on the basis of a closing command, energy of the spring 4 is stored together with a closing operation of the breaking portion, so that a drawing mechanism holds stored energy. Unlike the prior art, since the spring 4 is not disposed separately, the closing mechanism can be miniaturized and connecting parts become unnecessary.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic operating device for a circuit breaker, which causes a closing operation by an electromagnetic force and a breaking operation by a spring force.

[0002]

2. Description of the Related Art FIGS. 2A and 2B show respective states of a conventional electromagnetic operating device for a circuit breaker of this kind when a breaking portion is in a closed state and a closed state.

In these FIGS. 2A and 2B, 1 is U
A frame 2 of the electromagnetic operating device formed in a letter shape is a main shaft rotatably supported on the opposite side walls 1a, 1a of the frame 1. The main shaft 2 is coupled to the operation shaft of the shutoff unit 3 so as to be rotatable between a closing position where the shutoff unit 3 is closed and a shutoff position where the shutoff of the shutoff unit 3 is completed. . Reference numeral 4 denotes a blocking spring, one end of which is fixed to the frame 1 and the other end of which is coupled to the spindle 2 via a link mechanism L. The blocking spring 4 urges the spindle 2 toward the blocking position. Reference numeral 5 denotes a closing electromagnetic plunger attached to a base plate 6 fixed to the upper end of the frame 1. The closing electromagnetic plunger 5 includes a plunger body 7, a nominal iron 8 and an exciting excitation for exciting the nominal iron 8. It consists of a coil 9.

A joint 10 is attached to the working end of the plunger body 7, and a pin 11a provided at one end of a closing lever 11 is loosely fitted in a long hole 10a provided in the joint 10. An intermediate portion of the closing lever 11 is fixed to a shaft 12 rotatably supported by the frame 1, and a latch roller 13 is attached to the other end of the closing lever 11 by a pin 11b.

A hacker shaft 14 is rotatably supported on the frame 1, and one end of a charging hacker 15 is fixed to the hacker shaft 14. The closing hacker 15 is constantly urged by a return spring 17 in the counterclockwise direction in the drawing. As shown in FIG. 2B, an arcuate concave portion 15a for latching the latch roller is formed on the tip end side of the charging hacker 15.

One end of a main spindle lever 16 is fixed to the main spindle 2, and the main spindle lever 16 is rotated as shown in FIG.
It is adapted to rotate between a closing position shown in FIG. 2A and a shut-off position shown in FIG.

The other end of the main shaft lever 16 is pulled out via a pin 18 and one end of a hacker 19 is pivotally connected (pivotally connected). One end of a tripping free link 21 is pivotally connected to the tripping hacker 19 via a pin 20, and the other end of the tripping free link 21 is connected to a closing lever 11 by a pin 11b.
Is linked to. Stopper pins 22 and 23 are fixed to the tripping free link 21. Stopper pin 2
2 is abutted on one corner of a fan-shaped end 19a formed on the tripping hacker 19 to prevent relative rotation between the tripping hacker 19 and the tripping free link 21 in one direction, The stopper pin 23 abuts on the tip of the closing hacker 15 and regulates the rotation range of the closing hacker 15.

A locking pin 24 having a locking end portion 24a having a semicircular cross-sectional shape is attached to the tripping free link 21, and the working end portion 24a of the locking pin 24 is pulled out by the hacker 19. A locking position that engages with the other corner of the fan-shaped end portion 19a formed in the above to prevent relative rotation of the tripping hacker 19 and the tripping free link 21 in the other direction, The fan-shaped end portion 19a can be reciprocally rotated between an unlocked position where it is disengaged from a corner portion of the fan-shaped end portion 19a. The locking pin 24 is normally urged by a spring (not shown) so as to be held at the locking position shown in FIG. 2A, and when the blocking portion 3 is opened, a trigger mechanism having an electromagnet (not shown) is used to move the locking pin 24 to the locking position shown in FIG. It can be rotated to the unlocked position shown in B).

In this embodiment, the joint 10, the closing lever 11, the tripping free link 21 and the tripping hacker 19 whose relative rotation is blocked by the locking pin 24, and the spindle lever 16 are used. When the shutoff portion 3 is closed, the displacement of the plunger body 7 to the side of the nominal iron 8 is converted into rotational motion and transmitted to the main spindle 2 in order to rotate the main spindle 2 to the closing position against the biasing force of the cutoff spring 4. The charging mechanism 25 is configured.

Further, the latch roller 13 and the input hacker 15
The locking mechanism 2 that locks the closing mechanism 25 in the closing state by
6 are constituted.

Further, the locking mechanism 2 is constituted by the locking pin 24 and the tripping hacker 19 and the tripping free link 21 in a state where relative rotation is permitted by the locking pin 24.
A tripping mechanism 27 for tripping 6 is configured.

Reference numeral 29 is a guide arranged on the inner circumference of the closing exciting coil 9.

Next, the operation of such a conventional electromagnetic operating device for circuit breaker will be described. In the state of FIG. 2 (B), the blocking unit 3 is in the blocking state. In this state, the locking pin 24 is in the unlocked position where it does not engage with the fan-shaped portion 19a of the hacker 19 after being pulled out, but after the blocking portion 3 has blocked, the locking pin 24 automatically moves to the state shown in FIG. Return to the locking position shown. When the locking pin 24 is in the locking position, there is no relative rotation between the tripping hacker 19 and the tripping free link 21. In this state, when the closing exciting coil 9 of the closing electromagnetic plunger 5 is energized, the plunger body 7 is attracted to the nominal iron 8 and the closing lever 11 rotates clockwise in the drawing. As a result, the tripping free link 21 and the tripping hacker 19 are integrally displaced downward, and the spindle lever 16 is rotated clockwise in the drawing to rotate the spindle 2 clockwise. In this process, the breaking spring 4 is charged. The latch roller 13 moves along the inclined surface of the closing hacker 15 as the free tripping link 21 is displaced downward, and when the main shaft 2 rotates to the closing position, the latch roller 13 fits into the recess 15a of the closing hacker 15. Be locked. As a result, each part is held in the closed state shown in FIG. 2 (A), and the cutoff spring 4 is held in the stored state.

Next, when a disconnection command is given in the closed state shown in FIG. 2A, the locking pin 24 is rotated to the unlocked position shown in FIG. The driving force causes the tripping hacker 19 to rotate counterclockwise in the drawing and the tripping free link 21 to rotate clockwise, whereby the latch roller 13 is disengaged from the recess 15a of the closing hacker 15. Therefore, the closing lever 11 pivots counterclockwise to displace the plunger body 7 downward, and the spindle lever 16 pivots counterclockwise so that the spindle 2
Rotates to the shut-off position shown in FIG. 2 (B). In the initial stage of this breaking operation, the main shaft 2 is driven and accelerated by the biasing force of the blocking spring 4, and then driven to the blocking position only by the biasing force of the blocking spring 4.

[0015]

However, in the conventional electromagnetic operating device for a circuit breaker as described above, it is necessary to provide the breaking spring 4 independently between the frame 1 and the link mechanism L. There is a problem in that the size becomes large and a connecting part for connecting the blocking spring 4 to the frame 1 and the link mechanism L is required, resulting in an increase in cost.

An object of the present invention is to provide an electromagnetic operating device for a circuit breaker, which can reduce the size of the closing mechanism and reduce the cost.

[0017]

SUMMARY OF THE INVENTION The present invention relates to a main shaft which is connected to an operating shaft of a shutoff portion and rotates between a closing position for completing the closing of the shutoff portion and a shutoff position for completing the shutoff of the shutoff portion. A closing spring for urging the spindle toward the closing position, a closing electromagnetic plunger, and a closing solenoid for rotating the main shaft to the closing position against the urging force of the breaking spring when closing the breaking portion. A closing mechanism that transmits the driving force of the plunger to the spindle,
It is an object of the present invention to improve a circuit breaker operating device including a locking mechanism for locking the closing mechanism in a closed state and a tripping mechanism for pulling out the locking mechanism.

In the electromagnetic operating device for circuit breaker according to the first aspect of the present invention, energy is stored between the plunger body and the nominal iron in the closing exciting coil of the closing electromagnetic plunger during the closing operation of the plunger body. A blocking spring is arranged.

When the breaking spring is arranged between the plunger body and the nominal iron in the closing exciting coil so as to store energy during the breaking operation of the plunger body, the breaking spring is independent as in the conventional case. Since it is not necessary to additionally provide it, it is possible to reduce the size of the charging mechanism, and it is possible to reduce the cost because connection parts are unnecessary.

According to another aspect of the electromagnetic operating device for a circuit breaker of the present invention, the plunger main body is provided with a small-diameter head portion at its tip through a step, and the small diameter of the nominal iron is provided in accordance with the outer diameter of the head portion. The present invention is characterized in that head portions are provided, blocking spring placement spaces are formed around these head portions, and blocking springs are placed in the blocking spring placement spaces.

By thus reducing the diameter of each head portion, a space for arranging the breaking springs is provided around these head portions, and by arranging the breaking springs in the space for arranging the breaking springs, the electromagnetic plunger for closing is not increased in size. A blocking spring can be incorporated into the. Also, the blocking spring can be received at the stepped portion of the plunger body.

[0022]

1 (A) and 1 (B) show the essential configuration of an embodiment of an electromagnetic operating device for circuit breaker according to the present invention.

In the electromagnetic operating device for circuit breaker of this example,
A characteristic is that the breaking spring 4 is arranged between the plunger main body 7 and the nominal iron 8 in the closing exciting coil 9 of the closing electromagnetic plunger 5 so as to store energy during the breaking operation of the plunger main body 7. is there. In this case, the plunger body 7
A head portion 7b having a small diameter is provided at the tip end thereof via a step portion 7a, a head portion 8a having a small diameter is provided on the nominal iron 8 in accordance with the outer diameter of the head portion 7b, and a nominal end portion of the head portion 8a is provided. A flange-shaped base portion 8b of iron 8 is provided. By reducing the diameters of the head portions 7b and 8a as described above, a blocking spring arrangement space 28 is formed around the head portions 7b and 8a, and the blocking spring 4 formed of a compression coil spring is disposed in the blocking spring placement space 28. . One end of the shutoff spring 4 is in contact with the step portion 7a of the plunger body 7, and the other end is in contact with the flange-shaped base portion 8b of the nominal iron 8. Other configurations are the same as those in FIGS. 2A and 2B described above.

In such a circuit breaker electromagnetic operating device, when the closing command is issued, the closing exciting coil 9 is excited, and the plunger body 7 is attracted to the nominal iron 8, the breaking unit 3 performs closing operation. The blocking spring 4 is charged. The energizing force of the breaking spring 4 is held by the tripping mechanism 27, and when a tripping command is issued, the locking pin 24 rotates to disengage the tripping mechanism 27 and release the energizing force of the breaking spring 4. Then
Shut off.

When the shut-off spring 4 is arranged between the plunger body 7 and the nominal iron 8 in the closing exciting coil 9 as in this example so as to store energy when the plunger body 7 is shut off, the shut-off spring 4 is cut off. Since it is not necessary to separately provide the spring 4 as in the conventional case, it is possible to reduce the size of the closing mechanism, and it is possible to reduce the cost because connection parts are unnecessary.

Further, by reducing the diameter of the head portions 7b and 8a, a blocking spring disposition space 28 is formed around these head portions 7b and 8a. The blocking spring 4 can be incorporated without increasing the size of the electromagnetic plunger 5 for use. Further, the step spring 7 a of the plunger body 7 can receive the blocking spring 4.

[0027]

In the electromagnetic operating device for circuit breaker according to the first aspect of the present invention, the breaking spring is provided between the plunger main body and the nominal iron in the closing exciting coil so as to store energy during the breaking operation of the plunger main body. Since it is arranged, it is not necessary to separately provide the blocking spring as in the conventional case, which makes it possible to reduce the size of the closing mechanism and to reduce the cost because connection parts are not required. You can

According to another aspect of the electromagnetic operating device for a circuit breaker of the present invention, a head portion having a small diameter is provided at the tip of the plunger body through a step portion, and the head portion is made small in diameter to match the outer diameter of the head portion. Since the cutoff spring arrangement space is formed around these head portions and the cutoff spring is arranged in the cutoff spring arrangement space, the cutoff spring can be incorporated without enlarging the closing electromagnetic plunger. . Also, the blocking spring can be received at the stepped portion of the plunger body.

[Brief description of drawings]

1 (A) and 1 (B) are vertical cross-sectional views of a closed state and a closed state showing an example of an embodiment of an electromagnetic plunger for closing in an electromagnetic operating device for circuit breaker according to the present invention.

2A and 2B are vertical cross-sectional views of a conventional electromagnetic operating device for a circuit breaker in a closed state and a closed state, respectively.

[Explanation of symbols]

 1 Frame 1a Side Wall 2 Spindle 3 Blocking Part 4 Blocking Spring 5 Electromagnetic Plunger 6 Base Plate 7 Plunger Main Body 7a Step 7b Head Part 8 Prime Iron 8a Head Part 8b Flange-like Base 9 Excitation Coil 10 Joint 10a Long Hole 11 Closing lever 11a, 11b Pin 12 Shaft 13 Latch roller 14 Hacker shaft 15 Closing hacker 15a Recess 16 Main shaft lever 17 Return spring 18 Pin 19 Tripping hacker 19a Fan-shaped end 20 Pin 21 Tripping free link 22, 23 Stopper pin 24 Lock Pin 24a Locking end 25 Closing mechanism 26 Locking mechanism 27 Tripping mechanism 28 Breaking spring arrangement space 29 Insulation coating layer L link mechanism

Claims (2)

[Claims] 1. A main shaft which is connected to an operating shaft of a shutoff unit and rotates between a closing position for closing the shutoff unit and a shutoff position for completing the shutoff of the shutoff unit; A closing spring that biases the closing electromagnetic spring, a closing electromagnetic plunger, and a driving force of the closing electromagnetic plunger to rotate the main shaft to a closing position against the biasing force of the breaking spring when closing the breaking portion. A circuit breaker operating device comprising: a closing mechanism for transmitting to a main shaft; a locking mechanism for locking the closing mechanism in a closed state; and a tripping mechanism for pulling out the locking mechanism. An electromagnetic operating device for circuit breaker, wherein the breaking spring is arranged between the plunger body and the nominal iron in the exciting coil so as to store energy during the breaking operation of the plunger body. 2. The plunger main body is provided with a small-diameter head portion at a tip thereof through a step portion, and the nominal iron is provided with a small-diameter head portion according to an outer diameter of the head portion. A blocking spring arrangement space is formed around the
The electromagnetic operating device for a circuit breaker according to claim 1, wherein the breaking spring is arranged in the breaking spring arrangement space.