JPH0625867Y2 - Circuit breaker operating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a circuit breaker operating device that performs a closing operation by an electromagnetic force and a breaking operation by a spring force.

[Prior Art] Japanese Unexamined Patent Publication (Kokai) No. 57-1748 discloses an operating device for operating a circuit breaker.
An electromagnetic closing spring breaking type operating device as shown in No. 15 is often used. Generally, this type of operating device includes a main shaft that is connected to an operating shaft of a circuit breaker and that rotates between a closing position for closing the circuit breaker and a closing position for breaking the circuit breaker.
When the main shaft is at the cut-off position, the main shaft is provided with a cut-off spring for urging the main shaft to the cut-off position side, a nominal iron excited by the electromagnetic coil, and a plunger attracted to the nominal iron when the electromagnetic coil is excited. The plunger is located at a position away from the nominal iron, and the electromagnetic coil is energized when the circuit breaker is closed, and the main shaft is pushed against the biasing force of the breaker spring when the breaker is closed. A closing mechanism that converts the displacement of the plunger to the nominal iron side to rotate it to the closing position and transmits it to the main shaft, a locking mechanism that locks the closing mechanism in the closing state, and a tripping mechanism that pulls the locking mechanism out. And a mechanism.

[Problems to be Solved by the Invention] In the electromagnetic closing spring breaker type actuator as described above, the driving force for opening the breaker is obtained by a single breaker spring. If it becomes necessary to increase the above, the blocking spring must be made large. However, if the breaking spring is made larger, the electromagnetic plunger that obtains the driving force for closing the breaker must also be made larger, and the entire operating device becomes larger, occupying more area and increasing the cost. There was a problem of rising.

An object of the present invention is to provide a circuit breaker operating device capable of coping with an increase in load without increasing the size of the breaking spring.

[Means for Solving the Problems] The present invention relates to a main shaft that is connected to an operating shaft of a circuit breaker and rotates between a closing position where the closing of the circuit breaker is completed and a closing position where the circuit breaker is completed. , The main shaft is in the cut-off position, provided with a cut-off spring for urging the main shaft to the cut-off position side, a nominal iron excited by the electromagnetic coil, and a plunger attracted to the nominal iron when the electromagnetic coil is excited. Sometimes the plunger is located away from the nominal iron and the electromagnetic coil is energized when the circuit breaker is closed, and the main shaft resists the biasing force of the breaking spring when closing the breaker. The closing mechanism that converts the displacement of the plunger toward the nominal iron side into rotational motion to transmit to the spindle to rotate the closing mechanism to the closing position, the locking mechanism that locks the closing mechanism in the closing state, and the pulling mechanism that pulls out the locking mechanism. For circuit breaker with removal mechanism In the operating device, it is possible to cope with an increase in load without increasing the size of the breaking spring.

Therefore, in the present invention, when the main shaft is in the closing position, it abuts the lever attached to the main shaft in the first position, and when the main shaft rotates from the closing position to the shut-off position side by a certain angle, the first position Is provided so as to come into contact with the lever at a second position that is separated from the first position by a constant distance, and the movement range is restricted so as to move between the first position and the second position. An initial drive mechanism is provided that includes a plate and an initial drive spring that biases the plate toward the second position.

In this initial drive mechanism, the lever moves the contact plate from the second position to the first position in the course of the main shaft rotating in the range of the fixed angle toward the closing position, and the initial drive spring is stored. It

[Operation] When the initial drive mechanism is provided as described above, the main shaft can be urged by both the disconnection spring and the initial drive spring at the initial stage of interruption, so that the initial drive force at the time of interruption can be increased.
Even when the load is increased, the initial acceleration of the movable contactor of the circuit breaker can be smoothly performed. After the movable contactor of the circuit breaker is once started and accelerated, it can be sufficiently driven by the conventional breaking spring even if the load is increased. Therefore, by providing the initial drive spring as described above, it is possible to cope with an increase in load without increasing the size of the blocking spring.

When the initial drive spring is added as described above, the initial drive spring is stored at the end of the closing operation, so that the throwing force at the end of the closing operation becomes large. However, the driving force of the electromagnetic plunger of the type that attracts the plunger to the priming iron when excited increases in inverse proportion to the square of the distance between the plunger and the priming iron that attracts the plunger, and Since the driving force of the plunger is very large,
In particular, the initial drive spring can be stored without any trouble without making the electromagnetic plunger large.

As described above, according to the present invention, it is possible to cope with an increase in load without increasing the size of the breaking spring and the electromagnetic plunger.
It is possible to prevent the operating device from becoming large in size and occupying the area thereof when the load increases, and from increasing the cost.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.

1 to 3 show an embodiment of the present invention,
1 and 2 are sectional views showing the state of the operating device when the circuit breaker is in a closed state and a closed state, respectively, and FIG. 3 is a perspective view of a main part showing an initial drive spring added in the present invention. is there.

In FIG. 1 and FIG. 2, 1 is a frame of an operating device formed in a U-shape, 2 is a side wall 1 a, 1 of the frame 1 which is opposite
The main shaft 2 is rotatably supported by a, and the main shaft 2 is connected to the operation shaft of the circuit breaker CB and is provided between a closing position where the closing of the circuit breaker is completed and a closing position where the breaking of the circuit breaker is completed. It can rotate. Reference numeral 3 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 or the like. The blocking spring urges the spindle 2 toward the blocking position. Reference numeral 5 is a closing electromagnetic plunger attached to a base plate 100 fixed to the upper end of the frame 1.
This electromagnetic plunger has a plunger 5a and a nominal iron 5b.
And an electromagnetic coil 5c for exciting the nominal iron 5b. This electromagnetic plunger 5 is provided such that the plunger 5a is arranged at a position away from the nominal iron 5b when the main shaft 2 is at the cutoff position, and when the circuit breaker is closed, the electromagnetic coil 5c is excited to cause the plunger 5a to move. Are attracted to the iron 5b.

A joint 6 is attached to the working end of the plunger 5a, and a pin 7a provided at one end of a lever 7 is loosely fitted in an elongated hole 6a provided in the joint 6. The lever 7 has an intermediate portion fixed to a shaft 8 rotatably supported by the frame 1, and a latch roller 9 is attached to the other end of the lever 7 by a pin 7b. One end of a manual operation handle attachment boss 10 is attached to the shaft 8, and an operation handle (not shown) can be attached to the other end of the boss 10.

A hacker shaft 11 is also rotatably supported on the frame 1, and one end of a charging hacker 12 is fixed to the hacker shaft 11. The closing hacker 12 is constantly urged by the return spring 13 in the counterclockwise direction in the drawing. An arcuate notch 12a (see FIG. 2) for locking the latch roller is formed at the tip of the charging hacker 12.

One end of a main shaft lever 14 is fixed to the main shaft 2, and the main shaft lever 14 rotates between the closing position shown in FIG. 1 and the shut-off position shown in FIG. 2 as the main shaft 2 rotates.

The other end of the main shaft lever 14 is pivotally connected (pivotally connected) to one end of a hacker 16 which is pulled out via a pin 15. A free link 18 that can be removed from the hacker 16 via a pin 17.
Is pivoted at one end, and the other end of the trip free link 18 is pivotally connected to the lever 7 by a pin 7b. Stopper pins 19 and 20 are fixed to the trip free link 18,
The stopper pin 19 is a fan-shaped end 1 formed on the mint 16.
6a contacts one corner of 6a to prevent relative rotation of the hacker 16 and the tripping free link 18 in one direction. The rotation range of is regulated.

A locking pin 21 with a locking end 21a having a semicircular cross-section is attached to the trip free link 18, which has a working end 21a formed on the hacker 16 and has a fan-shaped end. 16a by engaging the other corner of 16a
Reciprocating rotation between a locking position that prevents relative rotation in the other direction between the pull-out free link 18 and the release free link 18, and an unlocking position where the corner of the fan-shaped end 16a is disengaged. Is ready to go. The lock pin 21 is constantly urged by a spring (not shown) so as to be held at the lock position shown in FIG.
When the breaker is opened, it can be rotated to the unlocked position shown in FIG. 2 by a trigger mechanism equipped with an electromagnet (not shown).

In this embodiment, the breaker is constituted by the joint 6, the lever 7, the tripping free link 18 and the tripping hacker 16 in which the relative rotation is blocked by the locking pin 21, and the main shaft lever 14. A closing mechanism is configured to convert the displacement of the plunger 5a on the side of the nominal iron 5b into a rotational motion and transmit it to the main shaft 2 so as to rotate the main shaft 2 to the closing position against the urging force of the cutoff spring at the time of closing. .

Further, the latch roller 9 and the closing hacker 12 constitute a locking mechanism that locks the closing mechanism in the closed state, and the locking pin 21 and the locking pin allow relative rotation. The tripping hacker 16 and the tripping free link 18 constitute a tripping mechanism for tripping the locking mechanism.

The above-mentioned respective parts are the same as those of the conventional operating device, but in the present embodiment, the initial drive mechanism 30 is arranged at the bottom of the frame 1. As shown in FIG. 3, the initial driving mechanism 30 includes a contact plate 31 having a structure in which flat plate-shaped spring receiving seats 31b, 31b are formed at both ends of a U-shaped abutting portion 31a, a pair of guide shafts 32, 32 and initial drive springs 33, 33, and the guide shafts 32, 32 are loosely fitted in holes provided through the spring receiving seats 31b, 31b at both ends of the contact plate 31, respectively. A threaded portion 32a having a diameter smaller than that of the guide shaft 32 is connected to the lower end of each guide shaft 32, and the threaded portion 32a extends through the bottom of the frame 1 and is guided to the lower surface side of the frame 1. Then, a nut 35 is screwed into each screw portion 32a, each guide shaft 32 is fixed to the frame 1 by the nut, and the contact plate 31 is vertically movably guided by each guide shaft. An enlarged head 32b is provided at the upper end of each guide shaft 32, and the head 3b is attached by the head.
It is designed to prevent the guide shaft 1 from coming off from the guide shaft. The initial drive springs 33, 33 are fitted to the guide shafts 32, 32, respectively, and are arranged in a compressed state between the spring receiving seats 31b, 31b and the bottom portion of the frame 1.

The contact plate 31 comes into contact with the tip of the spindle lever 14 at the first position when the spindle 2 is in the closing position, and is in the first position when the spindle 2 rotates from the closing position to the shut-off position by a certain angle. A second position (spring seat 3
1b is in contact with the enlarged head 32b of the guide shaft 32)
Is provided so as to contact the tip of the spindle lever 14, and the movement range is regulated by the guide shaft 32 so as to move only between the first position and the second position.

In this initial drive mechanism, the spindle lever 14 moves the contact plate 31 from the second position to the first position in the process of the spindle 2 rotating within the range of the constant angle at the end of the breaking operation of the circuit breaker. The drive spring 33 is charged. While the closing mechanism is locked in the closed state, the contact plate 31 is held in the first position and the initial drive spring 33 is held in the stored state.

When the breaking operation of the circuit breaker is performed, the initial drive spring 33 cuts off the main shaft 2 via the contact plate 31 and the main shaft lever 14 while the main shaft rotates a certain angle from the closing position to the closing position. Bias to the side.

The angular range in which the main shaft 2 is biased by the initial drive spring at the initial stage of the shutoff operation is appropriately set by adjusting the length of each guide shaft 32.

Next, the operation of the above embodiment will be described. In the above embodiment, the circuit breaker CB is in the cutoff state in the state shown in FIG. In the state shown in FIG. 2, the locking pin 21 is pulled out to remove the hacker 16.
Although it is in the unlocked position where it does not engage with the fan-shaped portion 16a, the locking pin 21a automatically returns to the locking position shown in FIG. 1 after the circuit breaker shuts off. When the locking pin 21 is in the locking position, relative rotation between the tripping hacker 16 and the tripping free link 18 cannot occur. When the exciting coil 5c of the electromagnetic plunger 5 is energized in this state, the plunger 5a is attracted to the nominal iron 5b, and the lever 7 rotates clockwise in the drawing. As a result, the tripping free link 18 and the tripping hacker 16 are integrally displaced downward, and the spindle lever 14 is rotated clockwise in the drawing to rotate the spindle 14
Rotate clockwise. In this process, the breaking spring 3 is charged. When the main shaft 2 reaches a certain section before reaching the loading position, the tip of the main shaft lever 14 is in the second position.
Since the plate comes into contact with and pushes the corresponding plate, the initial drive spring 33 is also stored (compressed) together with the blocking spring 3. As the free tripping link 18 is displaced downward, the latch roller 9 moves along the inclined surface of the closing hacker 12, and when the main shaft 14 rotates to the closing position, the latch roller 9 fits into the notch 12a of the closing hacker 12. It is locked together. As a result, each part is held in the closed state shown in FIG. 1, and the cutoff spring 3 and the initial drive spring 33 are held in the stored state.

In the operating device of the present embodiment, the initial drive spring 33 is stored at the end of the closing operation, so that the required throwing force becomes large and the load of the electromagnetic plunger increases. However, the driving force of the electromagnetic plunger is inversely proportional to the distance between the plunger 5a and the nominal iron 5b, and the plunger when the spindle lever 14 starts to contact the contact plate 31 (when the initial drive spring 33 starts to store energy). Since the distance between 5a and the iron 5b is sufficiently small and the driving force of the electromagnetic plunger 5 is sufficiently large, the energy of the initial driving spring 33 is stored without increasing the output of the electromagnetic plunger 5. Is done without any hindrance.

FIG. 4 shows the throwing force F and the closing load fi given by the electromagnetic plunger 5 with respect to the position of the spindle lever 14. The applied load fi from the breaking position shown in FIG. 2 to the contact position where the movable contact of the circuit breaker contacts the fixed contact is determined by the inertial force required to accelerate the movable contact of the circuit breaker CB and the movable contact. It is the sum f1 of the frictional force between the current collector and the current collector in contact with the movable contactor and the urging force of the cutoff spring 3. The loading load fi from the contact position to the position just before the loading completion position shown in FIG. 1 is f1 + f2 + f3,
Here, f2 is a frictional force between the movable contact and the fixed contact of the circuit breaker CB, and f3 is an electromagnetic repulsion force acting between the movable contact and the fixed contact. The closing load fi in the final section (distance section) of the closing operation is f1 + f2 + f3 + f4, where f4 is the biasing force of the initial drive spring 33. The closing load fi rapidly increases in the final section of the closing operation, but in this section, the throwing input F greatly increases in inverse proportion to the distance, so that the closing operation can be performed without trouble even if the electromagnetic plunger 5 is not made large. Can be made.

Biasing force f4 of the initial drive spring 33 and the initial drive spring 3
The size of the section in which 3 operates is appropriately set within a range not exceeding the throwing input F according to the applied load.

Next, when the shutoff command is given in the closed state shown in FIG. 1, the locking pin 21 is rotated to the unlocked position shown in FIG. 2, so that the driving force of the shutoff spring 3 and the initial drive spring 33 causes the locking pin 21 to rotate. The tripping hacker 16 rotates in the counterclockwise direction in the drawing, and the tripping free link 18 rotates in the clockwise direction, so that the latch roller 9 causes the notch portion 1 of the closing hacker 12 to rotate.
Removed from 2a. Therefore, the lever 7 rotates counterclockwise to displace the plunger 5a downward, and the spindle lever 14 rotates counterclockwise to rotate the spindle 2 to the shut-off position shown in FIG. In the initial stage of this interruption operation, the main shaft 2 is driven and accelerated by both the urging force of the interruption spring 3 and the urging force of the initial drive spring 33, and then driven to the interruption position only by the urging force of the interruption spring 3. . As described above, in the present invention, since the main shaft is accelerated by both the biasing force of the blocking spring and the biasing force of the initial drive spring in the initial stage of the blocking operation, the blocking operation can be stably started even if the load increases. Therefore, the blocking operation can be performed without any trouble.

[Effects of the Invention] As described above, according to the present invention, an initial drive mechanism having an initial drive spring for driving the main shaft is provided at the initial stage of the shutoff operation, and the shutoff spring and the initial drive spring are provided at the initial stage of shutoff. Since the main shaft is urged by both of them to increase the initial driving force at the time of breaking, the initial acceleration of the movable contactor of the circuit breaker can be smoothly performed even if the load increases, and the breaking operation It is possible to smoothly perform the start of and to perform the breaking operation without any trouble. Further, since the initial drive spring is designed to load the electromagnetic plunger only at the end of the closing when the throwing force is sufficiently large, the closing operation can be performed without trouble even if the electromagnetic plunger is not made large. Therefore, according to the present invention, there is an advantage that it is possible to cope with an increase in load without making the breaking spring and the electromagnetic plunger large.

[Brief description of drawings]

1 to 3 show the construction of an embodiment of the present invention, and FIG. 1 and FIG. 2 are cross-sectional views schematically showing the closed state and the closed state of the embodiment of the present invention, respectively. FIG. 3 is a perspective view of a main part showing the vicinity of the mounting portion of the initial drive spring, and FIG. 4 is a diagram showing the throwing force and the making load of the operating device of the embodiment of the present invention with respect to the position of the spindle lever. . 1 ... Frame, 2 ... Spindle, 3 ... Breaking spring, 5 ...
Electromagnetic plunger, 6 ... Joint, 7 ... Lever, 9
...... Latch roller, 12 …… Insertion hacker, 14 …… Spindle lever, 16 …… Tear off hacker, 17 …… Tear off free link, 21 …… Locking pin, 31 …… Attach plate, 32 ……
Guide shaft, 33 ... Initial drive spring.

Claims (1)

[Scope of utility model registration request] 1. A main shaft which is connected to an operating shaft of a circuit breaker and rotates between a closing position where the closing of the circuit breaker is completed and a closing position where the circuit breaker is completed, and the main shaft is located at a breaking position side. The plunger has a breaking spring when the main shaft is at the breaking position, the breaking spring having a biasing force, a nominal iron excited by the electromagnetic coil, and a plunger attracted by the nominal iron when the electromagnetic coil is excited. An electromagnetic plunger for making the electromagnetic coil is excited when the circuit breaker is closed, and a position where the main shaft is closed against the biasing force of the breaking spring when closing the circuit breaker. The closing mechanism that converts the displacement of the plunger to the nominal iron side to transmit it to the main shaft to rotate it to the main shaft, the locking mechanism that locks the closing mechanism in the closing state, and the locking mechanism is pulled out. With tripping mechanism In a circuit breaker operating device, a lever is attached to the main shaft, and when the main shaft is in a closing position, the main shaft contacts the lever at a first position, and the main shaft rotates from the closing position to a blocking position by a certain angle. Is provided so as to come into contact with the lever at a second position that is separated from the first position by a certain distance, and moves so as to move between the first position and the second position. An initial drive mechanism including a contact plate whose range is regulated and an initial drive spring that biases the contact plate toward the second position is provided, and the main shaft moves the fixed angle range toward the closing position. An operating device for a circuit breaker, wherein the contact plate is moved from a second position to a first position by the lever in the process of rotating to store the initial drive spring.