JP2021082453A - Breaker - Google Patents

Abstract

To provide a breaker capable of reducing a magnitude of a load to be applied to a transfer mechanism when switching from a non-loaded period to a loaded period.SOLUTION: A breaker comprises a ratchet gear, a feed pawl 92, a reverse rotation preventing pawl, a motor 94 and a load reduction part 100. The ratchet gear is energized in a first direction by a closing spring. In the motor 94, an output shaft 94a is mounted to a transmission mechanism 95 provided between the motor and the feed pawl 92, and the feed pawl 92 is moved via the transmission mechanism 95 by rotating the output shaft 94a, such that the ratchet gear is rotated in a second direction which is reverse to the first direction. The load reduction part 100 reduces a rotation speed of the motor 94 during a period from the regulation of the rotation of the ratchet gear which is rotated in the second direction by the feed pawl 92, in the first direction by the reverse rotation preventing pawl to next rotation of the ratchet gear in the second direction by the feed pawl 92.SELECTED DRAWING: Figure 8

Description

The present invention relates to a circuit breaker in which a closing spring is stored by a motor and the electric circuit is closed by the force of the stored closing spring.

Conventionally, a circuit breaker provided with a ratchet type charging mechanism for accumulating the input spring by a motor is known. For example, Patent Document 1 includes a breaker including a ratchet gear urged by a closing spring, a feed claw that engages with the ratchet gear, and a motor that rotates the ratchet gear by the feed claw to store the closing spring. Is disclosed.

In a circuit breaker having a ratchet type charging mechanism, a loaded period and a non-loaded period occur alternately. The loaded period is the period from when the feed claw starts rotating the ratchet gear in the direction opposite to the urging direction of the closing spring until the rotation of the ratchet gear in the urging direction is regulated by the reverse rotation prevention claw. The no-load period is the period from when the rotation of the ratchet gear in the urging direction is restricted by the reverse rotation prevention claw until the next feed claw starts rotating the ratchet gear in the direction opposite to the urging direction.

Jikkenhei 3-127740

However, in a circuit breaker having a ratchet type charge mechanism, a large load is suddenly applied to the transmission mechanism provided between the feed claw and the motor when switching from the no-load period to the loaded period.

The present invention has been made in view of the above, and an object of the present invention is to obtain a circuit breaker capable of reducing the magnitude of the load applied to the transmission mechanism when switching from the no-load period to the loaded period.

In order to solve the above-mentioned problems and achieve the object, the circuit breaker of the present invention includes a ratchet gear, a feed claw, a reverse rotation prevention claw, a motor, and a load reduction unit. The ratchet gear is urged in the first direction by the closing spring. The feed claw engages the ratchet gear. The reverse rotation prevention claw regulates the rotation of the ratchet gear in the first direction by the closing spring. In the motor, the output shaft is attached to a transmission mechanism provided between the feed claws, and the feed claws are moved via the transmission mechanism by rotating the output shaft to move the ratchet gear in the direction opposite to the first direction. Rotate in the second direction. The load reduction unit is used during the period from when the ratchet gear rotated in the second direction by the feed claw is restricted from rotating in the first direction by the reverse rotation prevention claw until it is rotated in the second direction by the next feed claw. , Reduce the rotation speed of the motor.

According to the present invention, it is possible to reduce the magnitude of the load applied to the transmission mechanism when switching from the no-load period to the loaded period.

Side sectional view of the circuit breaker in the open state in which the charge according to the first embodiment of the present invention is completed. The figure which shows the state of a part of the structure of the circuit breaker of the state shown in FIG. The figure which shows the relationship of the main shaft, the arm for insulation link, and the insulation link which concerns on Embodiment 1. The figure which shows the state of a part of the structure of the circuit breaker of the state shown in FIG. Cross-sectional view of the circuit breaker main body when the circuit breaker according to the first embodiment is in a trip state. The figure which shows the state of a part of the structure of the circuit breaker in the state shown in FIG. Side view showing an example of the electric charge mechanism according to the first embodiment. Front view showing an example of the electric charging mechanism according to the first embodiment Side view showing an example of the electric charge mechanism according to the first embodiment. The figure for demonstrating the operation of the electric charge mechanism which concerns on Embodiment 1. The figure which shows the change of the load torque applied to the output shaft of the reduction gear in the electric charge mechanism which concerns on Embodiment 1. The figure which shows an example of the structure of the cam which concerns on Embodiment 1. The figure which shows an example of the relationship between the contact part of a motor and a microswitch in the electric charge mechanism which concerns on Embodiment 1. The figure which shows another example of the relationship between the contact part of a motor and a microswitch in the electric charge mechanism which concerns on Embodiment 1. The figure which shows the change between the load torque applied to Embodiment 1 and the contact state of each microswitch.

Hereinafter, the circuit breaker according to the embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to this embodiment.

Embodiment 1.
FIG. 1 is a side sectional view of a circuit breaker in an open state in which charging according to the first embodiment of the present invention is completed. FIG. 2 is a diagram showing a state of a part of the circuit breaker in the state shown in FIG. FIG. 3 is a diagram showing the relationship between the main shaft, the arm for insulating link, and the insulating link according to the first embodiment. FIG. 4 is a diagram showing a state of a part of the circuit breaker in the state shown in FIG. FIG. 5 is a cross-sectional view of a circuit breaker main body when the circuit breaker according to the first embodiment is in a trip state. FIG. 6 is a diagram showing a state of a part of the circuit breaker in the state shown in FIG.

The circuit breaker 1 shown in FIG. 1 is an air circuit breaker, and is connected between a power supply device (not shown) and a load device (not shown). The load device is, for example, an electric device that consumes electric power supplied from a power supply device. The circuit breaker 1 includes an insulating housing 10 having a mold case 10a and a mold cover 10b. In the housing 10, the members of the electric system 6 for opening and closing the main circuit are mainly arranged on the right side in FIG. 1, and the members of the mechanical system 7 for opening and closing are arranged on the left side in FIG. ..

The electrical system 6 of the circuit breaker 1 has a load-side fixed conductor 42 having one end protruding from the housing 10 and being connected to the load device, a movable contactor 43 to which a movable contact 43a is fixed, and one end protruding from the housing 10. It is provided with a power supply side fixed conductor 44 which is connected to the power supply device and has a fixed contact 44a facing the movable contact 43a fixed to the other end. In a plurality of drawings including FIG. 1, in order to make the explanation easy to understand, the vertical direction is defined as the Z-axis direction, and the extending direction of the load-side fixed conductor 42 and the power supply-side fixed conductor 44 is defined as the X-axis direction. The figure shows a three-dimensional Cartesian coordinate system in which the direction orthogonal to the axis and the Z axis is the direction of the Y axis.

Further, the electric system 6 includes a flexible conductor 45 having flexibility, one end of which is fixed to the housing 10 and the other end of which is fixed to the movable contactor 43. When the movable contact 43a and the fixed contact 44a come into contact with each other, the load-side fixed conductor 42 and the power supply-side fixed conductor 44 are electrically connected via the flexible conductor 45. The movable contact 43 in which the movable contact 43a is arranged is attached to the mechanism system 7 by the connecting pin 49 and is driven by the mechanism system 7.

Further, the electric system 6 includes a movable child holder 46 whose one end is rotatably attached to a holder shaft 48 held by the mold case 10a, and a pressure spring attached between the mold case 10a and the movable contact 43. 47 and an arc extinguishing chamber 4 are provided. In the open state shown in FIG. 1, the circuit breaker 1 is urged by the pressure contact spring 47 in a direction in which the movable contact 43a is separated from the fixed contact 44a. Further, in the closed state shown in FIG. 4, the circuit breaker 1 is urged by the pressure contact spring 47 in the direction in which the movable contact 43a is pressed against the fixed contact 44a. The arc extinguishing chamber 4 cuts an arc generated when the movable contact 43a is separated from the fixed contact 44a.

Next, the mechanical system 7 of the circuit breaker 1 will be described. As shown in FIG. 2, the circuit breaker 1 includes a frame 16 including a pair of frames 16a and 16b and fixed to the housing 10, a camshaft 21, and a nut 82. The frame 16a and the frame 16b are arranged at intervals by the camshaft 21 and the nut 82. Although the camshaft 21 is a bolt, it may be a member other than the bolt.

The mechanism system 7 is arranged so as to be sandwiched between the frame 16a and the frame 16b. Unless otherwise specified, the holder shaft 48, the connecting pin 49, and the respective shafts in the mechanism system 7 are arranged in a direction parallel to the shaft of the camshaft 21, that is, in the Y-axis direction.

In the mechanism system 7 of the circuit breaker 1, one end is fixed to the frame 16, the guide plate 17 extending upward in FIG. 1, the input spring 18 attached to the guide plate 17, and the intermediate portion rotate to the shared fixed shaft 24a. It includes a charge arm 24 that is supported so as possible, and a charge cam 22 that rotates the charge arm 24.

A spring hook pin 24d is provided at one end of the charge arm 24, and the spring hook pin 24d is inserted into an elongated hole 16c formed in the frame 16. One end of the closing spring 18 comes into contact with the spring hook pin 24d, and the other end comes into contact with the frame 16. The charging cam 22 is fixed to the cam shaft 21.

The mechanism system 7 includes an electric charging mechanism 90 that rotates the charging cam 22 to store the charging spring 18. The electric charging mechanism 90 includes a ratchet gear 91. The ratchet gear 91 is fixed to the camshaft 21 like the charging cam 22, and the electric charging mechanism 90 rotates the charging cam 22 by rotating the ratchet gear 91. The specific configuration of the electric charging mechanism 90 will be described in detail later.

An arm-side roller 24b is provided at the other end of the charge arm 24, and the arm-side roller 24b comes into contact with the cam surface 22b of the charging cam 22. The rotation of the charging cam 22 causes the arm-side roller 24b to move along the cam surface 22b.

Further, the mechanism system 7 includes a first closed latch 25 whose base end is rotatably supported by the shared fixed shaft 24a and a second closed latch 26 rotatably supported by the fixed shaft 26a. It includes a closed bar 27 formed in a semi-cylindrical shape.

The charging cam 22 has a cam-side roller 22a provided between the charging cam 22 and the ratchet gear 91, and the tip of the first closed latch 25 comes into contact with the cam-side roller 22a. A latch-side roller 25a is provided in the middle between the base end and the tip end of the first closed latch 25, and the latch-side roller 25a abuts on one end of the second closed latch 26.

A protruding portion 26b and an engaging portion 26c are formed at one end of the second closed latch 26. Since the second close latch 26 receives a counterclockwise force in FIG. 1 by a return spring (not shown), the protrusion 26b tries to rotate the first close latch 25 clockwise. When the circuit breaker 1 is in the state shown in FIG. 1, the first close latch 25 is in contact with the cam side roller 22a, the cam side roller 22a serves as a stopper, and the first close latch 25 cannot rotate. Is held in. The close bar 27 is rotated clockwise by a manual operation with an on button (not shown) or an on operation with a solenoid or the like.

As shown in FIG. 3, the mechanism system 7 has a second main shaft 28, an insulating link arm 28a fixed to the main shaft 28, and a second insulated link arm 28a fixed to the main shaft 28 and arranged between the insulating link arms 28a. It is provided with a link arm 28b. The main shaft 28 is rotatably supported by the frame 16. The insulating link arm 28a has three base ends arranged at equal intervals along the extending direction on the main shaft 28. The insulating link arm 28a and the second link arm 28b have the same shape. The insulating link arm 28a is rotatably connected to one end of the insulating link 41 shown in FIG. 4 by a pin (not shown). The other end of the insulating link 41 is connected to the movable contact 43.

As shown in FIGS. 1 and 4, the mechanism system 7 includes a closing toggle link mechanism 29, a link lever 30 rotatably supported by the fixed shaft 30a, and a trip latch 31 rotatably supported by the fixed shaft 26a. And a trip bar 32 that engages with one end of the trip latch 31.

The input toggle link mechanism 29 includes a first link 29a, a second link 29b, and pins 29c and 29d. One end of the first link 29a is rotatably connected to one end of the link lever 30 by a pin 30b. The other end of the first link 29a and one end of the second link 29b are connected by a pin 29d. The other end of the second link 29b is connected to the other end of the second link arm 28b by a pin 29c. The link lever 30 is provided with a lever-side roller 30c in the middle between one end and the center of rotation. The side surface of the trip latch 31 engages with the lever side roller 30c.

When an on button (not shown) is pressed in the state shown in FIG. 1, the close bar 27 rotates clockwise, and the lock of the second close latch 26 by the close bar 27 is released. The unlocked second close latch 26 rotates clockwise in FIG. 1 to disengage the engaging portion 26c from the latch-side roller 25a. Therefore, the charging cam 22 rotates counterclockwise in FIG. 1 while rotating the first close latch 25 counterclockwise in FIG. 1 by the cam-side roller 22a, so that the arm-side roller 24b causes the charging cam 22. It falls into the stepped portion of the cam surface 22b of 22. Therefore, the charge arm 24 is in a free state.

When the charge arm 24 is in the free state, the charging spring 18 rotates counterclockwise in FIG. 1, and the operating surface 24c flips up the link-side roller 29e of the charging toggle link mechanism 29. Since the trip latch 31 is locked in the counterclockwise direction in FIG. 1 by the trip bar 32, the closing toggle link mechanism 29 extends and rotates the second link arm 28b counterclockwise in FIG.

As a result, as shown in FIGS. 5 and 6, in the circuit breaker 1, the movable contact 43a and the fixed contact 44a come into contact with each other, and the electric circuit is closed. In the state shown in FIG. 5, the link lever 30 is given the clockwise rotational force in FIG. 5 via the closing toggle link mechanism 29 and the pin 30b by the pressure contact spring 47, but the trip bar 32 provides the link lever 30. The counterclockwise rotation of the link lever 30 in FIG. 5 is blocked.

As shown in FIG. 5, in the trip state in which the closing spring 18 is released, when the ratchet gear 91 is driven by the electric charging mechanism 90 and the ratchet gear 91 rotates counterclockwise in FIG. 5, the charging cam 22 moves in FIG. Rotate counterclockwise in. As a result, the charge arm 24 rotates clockwise around the camshaft 21 to the position shown in FIG. 1, and the springing pin 24d presses the closing spring 18, so that the charging spring 18 is stored. .. In this way, the closing spring 18 is in the energy storage complete state shown in FIGS. 1 and 4.

Next, the configuration of the electric charge mechanism 90 will be specifically described. FIG. 7 is a side view showing an example of the electric charging mechanism according to the first embodiment. FIG. 8 is a front view showing an example of the electric charging mechanism according to the first embodiment. FIG. 9 is a side view showing an example of the electric charging mechanism according to the first embodiment. Note that in FIGS. 8 and 9, a part of the configuration of the electric charging mechanism 90 including the ratchet gear 91 is not shown.

As shown in FIG. 7, the electric charge mechanism 90 includes a ratchet gear 91 in which a plurality of gear teeth 91a are formed, a feed claw 92, a reverse rotation prevention claw 93, and springs 96 and 98. The ratchet gear 91 is urged clockwise in FIG. 7 by a closing spring 18 via a charge arm 24, a charging cam 22, and a cam shaft 21. In the following, the direction in which the ratchet gear 91 is rotated by the urging by the closing spring 18 may be described as the urging direction. The urging direction is an example of the first direction.

The tip 92a of the feed claw 92 engages with the gear teeth 91a of the ratchet gear 91. The spring 96 is bridged between the base end portion of the feed tab 92 and the frame 16, and urges the feed tab 92 counterclockwise in FIG. 7.

The base end portion of the reverse rotation prevention claw 93 is rotatably attached to the frame 16. The reverse rotation prevention claw 93 is urged counterclockwise in FIG. 7 by a spring 98, and the tip portion 93a engages with the gear teeth 91a of the ratchet gear 91. As a result, the reverse rotation prevention claw 93 regulates the rotation of the ratchet gear 91 in the urging direction. The reverse rotation prevention claw 93 does not regulate the rotation of the ratchet gear 91 in the direction opposite to the urging direction.

As shown in FIG. 8, the electric charge mechanism 90 includes a motor 94 and a transmission mechanism 95 that transmits the rotational force of the output shaft 94a of the motor 94 to the pawl 92. The motor 94 is a DC motor that rotates the output shaft 94a by DC power, but may be an AC motor.

The transmission mechanism 95 includes a reduction gear 95a in which a gear on the input side is attached to the output shaft 94a of the motor 94, and a rotating member 95b attached to the output shaft 95c of the reduction gear 95a and rotating around the output shaft 95c. The base end of the feed tab 92 is rotatably attached to a position deviated from the rotation center of the rotating member 95b.

The rotating member 95b is urged counterclockwise in FIG. 7 by the spring 96 shown in FIG. 7 with the output shaft 95c as the center of rotation. When the output shaft 95c of the reduction gear 95a rotates due to the rotation of the output shaft 94a of the motor 94, the rotating member 95b rotates counterclockwise in FIG. 7. When the rotating member 95b rotates counterclockwise in FIG. 7, the feed claw 92 repeats a reciprocating curve motion similar to that of the arc slider crank a plurality of times, so that the feed claw 92 rotates the ratchet gear 91.

As described above, in the electric charge mechanism 90, the motor 94 is fed via the transmission mechanism 95 by the rotation of the output shaft 94a, in which the output shaft 94a is attached to the transmission mechanism 95 provided between the motor 94 and the feed claw 92. Move the claw 92 back and forth. As a result, the ratchet gear 91 rotates in the direction opposite to the urging direction. The direction opposite to the urging direction is an example of the second direction.

FIG. 10 is a diagram for explaining the operation of the electric charging mechanism according to the first embodiment. In the first state shown in FIG. 10, the feed claw 92 of the electric charge mechanism 90 is engaged with the gear teeth 91a of the ratchet gear 91. In the electric charge mechanism 90, the ratchet gear 91 moves in the direction in which the feed claw 92 rotates the gear teeth 91a counterclockwise in FIG. 10 due to the rotation of the output shaft 94a of the motor 94 from the first state. Rotates counterclockwise in, and the second state shown in FIG. 10 is reached. In the second state, the load from the ratchet gear 91 is applied to the transmission mechanism 95 via the feed claw 92 by the urging force of the closing spring 18 with respect to the ratchet gear 91.

In the electric charge mechanism 90, when the output shaft 94a of the motor 94 further rotates from the second state, the feed claw 92 moves in the direction of rotating the gear teeth 91a counterclockwise in FIG. 10, and the ratchet gear 91 moves in the direction of rotating the gear teeth 91a in FIG. Rotates counterclockwise in the third state shown in FIG. In the third state, the electric charge mechanism 90 is at a dead center position where the load from the ratchet gear 91 applied to the transmission mechanism 95 via the feed claw 92 becomes zero.

In the electric charge mechanism 90, the output shaft 94a of the motor 94 further rotates from the third state, so that the feed claw 92 moves in a direction opposite to the direction in which the gear teeth 91a are rotated counterclockwise in FIG. Since the ratchet gear 91 is urged clockwise in FIG. 10 by the closing spring 18, the ratchet gear 91 rotates clockwise in FIG. 10 with the urging force of the closing spring 18 applied, and is shown in FIG. It will be in the 4th state.

In the electric charge mechanism 90, when the output shaft 94a of the motor 94 further rotates from the fourth state, the ratchet gear 91 rotates clockwise in FIG. 10 and the reverse rotation prevention claw 93 engages with the gear teeth 91a of the ratchet gear 91. .. When the reverse rotation prevention claw 93 engages with the gear teeth 91a of the ratchet gear 91, the clockwise rotation of the ratchet gear 91 in FIG. 10 is stopped. When the output shaft 94a of the motor 94 further rotates after the reverse rotation prevention claw 93 engages with the gear teeth 91a of the ratchet gear 91, the fifth state shown in FIG. 10 is reached. In the fifth state, a frictional force generated between the feed claw 92 and the ratchet gear 91 is applied, but since the ratchet gear 91 does not rotate due to the reverse rotation prevention claw 93, the feed claw 92 is input to the transmission mechanism 95 via the feed claw 92. No urging force is applied by the spring 18.

FIG. 11 is a diagram showing a change in load torque applied to the output shaft of the reduction gear in the electric charging mechanism according to the first embodiment. The first to fifth states in FIG. 11 correspond to the first to fifth states shown in FIG. In FIG. 11, the vertical axis represents the load torque applied to the output shaft 95c of the reduction gear 95a, and the horizontal axis represents the rotation angle of the output shaft 95c of the reduction gear 95a.

The output shaft 95c of the reduction gear 95a rotates the ratchet gear 91 by an angle equal to that of the gear teeth 91a in each cycle from the time t10 to t30 of one rotation. The output shaft 95c of the reduction gear 95a repeatedly rotates, whereby the ratchet gear 91 is in the state shown in FIG. The time t30 is the time immediately before switching from the no-load period to the loaded period.

The loaded period shown in FIG. 11 is a period from time t10 to t20. That is, in the loaded period, during the period in which the output shaft 95c of the reduction gear 95a makes one rotation, the ratchet gear 91 starts to rotate in the direction opposite to the urging direction by the feed claw 92, and then the urging direction by the reverse rotation prevention claw 93. It is the period until the rotation to is regulated. During such a load period, the load from the ratchet gear 91 is applied to the transmission mechanism 95 by the urging force of the closing spring 18.

The no-load period shown in FIG. 11 is a period from time t20 to t30. That is, during the no-load period, the ratchet gear 91 is restricted from rotating in the urging direction by the reverse rotation prevention claw 93 during the period of one cycle, and then the ratchet gear 91 is moved in the direction opposite to the urging direction by the feed claw 92. It is the period until it is rotated to. In other words, the no-load period is a period during which the torque due to the urging force of the closing spring 18 is not applied to the transmission mechanism 95.

As described above, in the electric charge mechanism 90, the loaded period and the unloaded period are repeated by the rotation of the output shaft 95c of the reduction gear 95a. When switching from the no-load period to the loaded period, the feed claw 92 is pressed against the gear teeth 91a of the stopped ratchet gear 91. Therefore, the higher the moving speed of the feed claw 92, the larger the load is suddenly applied to the transmission mechanism 95. Therefore, the electric charge mechanism 90 of the circuit breaker 1 includes a load reduction unit 100 that reduces the rotation speed of the motor 94 during the no-load period. The rotation speed of the motor 94 is the rotation speed of the output shaft 94a in the motor 94.

As shown in FIG. 8, the load reducing unit 100 includes a cam 101 attached to the output shaft 95c of the reduction gear 95a and a micro switch SW1 provided at a position facing the cam 101. The cam 101 rotates in synchronization with the rotation of the output shaft 95c of the reduction gear 95a. In the example shown in FIG. 8, the cam 101 is attached to the output shaft 95c, but may be attached to another rotating shaft that rotates in synchronization with the output shaft 95c.

FIG. 12 is a diagram showing an example of the configuration of the cam according to the first embodiment. As shown in FIG. 12, the cam 101 is formed in a disk shape, and a recess 101a is formed in a part of the outer edge portion. Further, the cam 101 is provided with an opening 101b at the center for inserting the output shaft 95c of the reduction gear 95a.

As shown in FIG. 9, the microswitch SW1 is connected to an actuator 102a that abuts on the outer edge of the cam 101 and an electric circuit that supplies electric power to the motor 94, and is a contact portion that controls the motor 94 based on the position of the actuator 102a. It has 102b and. The micro switch SW1 is, for example, a c-contact switch.

The actuator 102a of the microswitch SW1 comes into contact with the recess 101a of the cam 101 during at least a part of the no-load period. For example, in FIG. 11, the actuator 102a is in contact with the recess 101a of the cam 101 in the range from the time t21 to the position immediately before the time t30, and when the time t30 is reached, the actuator 102a is not in contact with the recess 101a. become. Therefore, in the period from the time t21 shown in FIG. 11 to the time t30, the b contact of the micro switch SW1 is turned on, and then the micro is micro at the time t30 immediately before switching from the no-load period to the loaded period. The a contact of the switch SW1 is turned on.

FIG. 13 is a diagram showing an example of the relationship between the contact portion of the motor and the microswitch in the electric charging mechanism according to the first embodiment. In the example shown in FIG. 13, the contact portion 102b of the microswitch SW1 is connected in series with the motor 94, and the motor is connected to either the resistor R1, the power supply E, and the contact portion 112b of the microswitch SW2 in series or the resistor R2. Connect 94. The configuration of the micro switch SW2 will be described later.

The contact portion 102b connects the motor 94 to the series connection body of the contact portion 112b of the resistor R1, the power supply E, and the micro switch SW2 at a position where the actuator 102a does not abut on the recess 101a. As a result, a current flows from the power source E to the motor 94 via the resistor R1 and the contact portion 112b. Further, the contact portion 102b connects the motor 94 to the resistor R2 at a position where the actuator 102a abuts on the recess 101a. As a result, the power supply to the motor 94 is cut off during at least a part of the no-load period.

Further, since the resistor R2 is connected in parallel with the motor 94, a current flows through the resistor R2 due to the induced electromotive force of the motor 94, and the motor 94 is braked. Therefore, the rotation speed of the motor 94 decreases. The size of the brake applied to the motor 94 is determined by the resistance value of the resistor R2.

In this way, the electric charging mechanism 90 reduces the rotational speed of the motor 94 during at least a part of the no-load period. Therefore, when switching from the no-load period to the loaded period, the rotation speed of the motor 94 is lower than that in the case where the power supply to the motor 94 is continued. Therefore, the kinetic energy when switching from the no-load period to the loaded period can be reduced, and the magnitude of the load applied to the transmission mechanism 95 when switching from the no-load period to the loaded period can be reduced. When the power supply to the motor 94 is continued, if the no-load period is long, the rotation speed of the motor 94 increases in the no-load period. Therefore, when the power supply to the motor 94 is continued, if the no-load period is long, the load applied to the transmission mechanism 95 when switching from the no-load period to the loaded period becomes even larger. In the electric charge mechanism 90, since the rotation speed of the motor 94 decreases in at least a part of the no-load period, the magnitude of the load applied to the transmission mechanism 95 is reduced even when the no-load period is long. be able to.

FIG. 14 is a diagram showing another example of the relationship between the contact portion of the motor and the microswitch in the electric charging mechanism according to the first embodiment. In the example shown in FIG. 14, the microswitch SW1 is connected in series with the motor 94, the contact portion 112b of the microswitch SW2, and the power supply E, and any of the resistors R1 and R2 is connected in series with the motor 94. The resistance value of the resistor R1 is smaller than the resistance value of the resistor R2.

The contact portion 102b connects the motor 94 to the resistor R1 at a position where the actuator 102a does not abut on the recess 101a. As a result, a current flows from the power source E to the motor 94 via the resistor R1. Further, the contact portion 102b connects the motor 94 to the resistor R2 at a position where the actuator 102a abuts on the recess 101a. As a result, a current flows from the power source E to the motor 94 via the resistor R2, so that the power supplied to the motor 94 becomes smaller than when the motor 94 is connected to the power source E via the resistor R1 and the motor 94. Rotation speed decreases.

In this way, the electric charging mechanism 90 reduces the rotational speed of the motor 94 during at least a part of the no-load period. Therefore, similarly to the circuit shown in FIG. 13, the circuit shown in FIG. 14 can reduce the kinetic energy when switching from the no-load period to the loaded period, and is transmitted when switching from the no-load period to the loaded period. The magnitude of the load applied to the mechanism 95 can be reduced.

In the above-described example, the electric charging mechanism 90 reduces the rotation speed of the motor 94 in the period from the time t21 shown in FIG. 11 to immediately before the time t30, but the present invention is not limited to this example. That is, if the kinetic energy at the time of switching from the no-load period to the loaded period can be reduced, the period for reducing the rotational speed of the motor 94 is not limited to the period from the time t21 to immediately before the time t30.

In the above-described example, the concave portion 101a is formed on the outer edge portion of the cam 101, but the outer edge portion of the cam 101 may be provided with a convex portion instead of the concave portion 101a. In this case, the actuator 102a comes into contact with the convex portion of the cam 101 during at least a part of the no-load period. As a result, the rotation speed of the motor 94 can be reduced during the no-load period. Further, the cam 101 may be configured to be provided with grooves having different depths in the circumferential direction instead of providing the concave portion or the convex portion on the outer edge portion. In this case, the actuator 102a of the micro switch SW1 comes into contact with the groove of the cam 101.

Further, in the above-described example, the rotation speed of the motor 94 is reduced during the no-load period by using the microswitch SW1 and the cam 101, but the configuration may include the optical position sensor and the microswitch SW1. .. In the optical position sensor, for example, when the a contact of the micro switch SW1 is turned off at a position from the fifth state to immediately before the first state shown in FIG. 11 and then the position of the micro switch SW1 is reached, the micro switch SW1 Turn on the a contact.

Next, the function of the micro switch SW2 will be described. As shown in FIG. 9, the electric charge mechanism 90 includes a cam 111 attached to the cam shaft 21 and a micro switch SW2 provided at a position facing the cam 111. Like the cam 101, the cam 111 is formed in a disk shape, and a recess 111a is formed in a part of the outer edge. Further, the cam 111 is provided with an opening (not shown) for inserting the cam shaft 21 in the center portion.

As shown in FIG. 9, the microswitch SW2 has an actuator 112a that abuts on the outer edge of the cam 111, and a contact portion 112b that controls the motor 94 based on the position of the actuator 112a. The micro switch SW2 is a b-contact switch. The contact portion 112b connects the motor 94 to the power supply E at a position where the actuator 112a does not abut on the recess 111a. Further, the contact portion 112b disconnects the motor 94 from the power supply E at a position where the actuator 112a abuts on the recess 111a.

FIG. 15 is a diagram showing changes between the load torque applied to the first embodiment and the contact state of each microswitch. The micro switch SW1 shown in FIG. 15 is in the ON state when the circuit breaker 1 is in the state shown in FIG. 5, and is turned off when the circuit breaker 1 is in the state shown in FIG. As a result, when the circuit breaker 1 is in the state shown in FIG. 1, the power supply to the motor 94 is cut off.

Further, the micro switch SW1 repeats on and off until the circuit breaker 1 changes from the state shown in FIG. 5 to the state shown in FIG. When the motor 94 and the micro switch SW1 have a connection relationship shown in FIG. 13, the a contact of the micro switch SW1 is a contact for connecting the motor 94 to the power supply E, and the b contact of the micro switch SW1 connects the motor 94 from the power supply E. It is a contact to be cut.

As described above, the circuit breaker 1 according to the first embodiment includes the ratchet gear 91 urged in the first direction by the closing spring 18, the feed claw 92 engaged with the ratchet gear 91, and the ratchet by the closing spring 18. It is provided with a reverse rotation prevention claw 93 that regulates the rotation of the ratchet gear 91 in the first direction of the gear 91. The circuit breaker 1 includes a motor 94 and a load reducing unit 100. The motor 94 includes a load reduction unit 100. The motor 94 has an output shaft 94a attached to a transmission mechanism 95 provided between the feed tab 92 and the ratchet gear 91 by rotating the output shaft 94a to move the feed tab 92 via the transmission mechanism 95. Rotate in the second direction, which is the opposite direction to the first direction. In the load reducing unit 100, the ratchet gear 91 rotated in the second direction by the feed claw 92 is restricted from rotating in the first direction by the reverse rotation prevention claw 93, and then the ratchet gear 91 is seconded by the feed claw 92. The rotation speed of the motor 94 is reduced during the no-load period, which is the period until the motor 94 is rotated in the direction. As a result, the circuit breaker 1 can reduce the magnitude of the load applied to the transmission mechanism 95 when switching from the no-load period to the loaded period.

Further, the load reduction unit 100 includes a cam 101 and a micro switch SW1. The micro switch SW1 is an example of a switch. The cam 101 rotates in synchronization with the rotation of the output shaft 95c of the transmission mechanism 95. The microswitch SW1 has an actuator 102a that abuts on the cam 101 and a contact portion 102b that controls the motor 94 based on the position of the actuator 102a. As a result, it is possible to reduce the magnitude of the load applied to the transmission mechanism 95 when switching from the no-load period to the loaded period with a relatively simple configuration.

Further, a concave portion 101a or a convex portion is formed on the outer edge portion of the cam 101. The actuator 102a comes into contact with the concave portion 101a or the convex portion during the no-load period. The contact portion 102b is connected to an electric circuit that supplies electric power to the motor 94, and when the actuator 102a moves to a position where it abuts on the concave portion 101a or the convex portion, the electric power supplied to the motor 94 is reduced or reduced to zero. Reduces the rotation speed of the motor 94. As a result, it is possible to reduce the magnitude of the load applied to the transmission mechanism 95 when switching from the no-load period to the loaded period with a relatively simple configuration.

The configuration shown in the above-described embodiment shows an example of the content of the present invention, can be combined with another known technique, and is one of the configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

1 Breaker, 4 Arc extinguishing chamber, 6 Electrical system, 7 Mechanical system, 10 housing, 10a mold case, 10b mold cover, 16, 16a, 16b frame, 16c long hole, 17 guide plate, 18 input spring, 21 cam Shaft, 22 charge cam, 22a cam side roller, 22b cam surface, 24 charge arm, 24a shared fixed shaft, 24b arm side roller, 24c working surface, 24d spring hook pin, 25 first closed latch, 25a latch side roller , 26 Second Close Latch, 26a, 30a Fixed Shaft, 26b Protrusion, 26c Engagement, 27 Close Bar, 28 Main Shaft, 28a Insulated Link Arm, 28b Second Link Arm, 29 Input Toggle Link Mechanism, 29a 1st link, 29b 2nd link, 29c, 29d, 30b pin, 29e link side roller, 30 link lever, 30c lever side roller, 31 trip latch, 32 trip bar, 41 insulated link, 42 load side fixed conductor, 43 Movable Contact, 43a Movable Contact, 44 Power Supply Side Fixed Conductor, 44a Fixed Contact, 45 Flexible Conductor, 46 Movable Holder, 47 Pressure Spring, 48 Holder Shaft, 49 Connecting Pin, 82 Nut, 90 Electric Charge Mechanism, 91 Ratchet gear, 91a gear teeth, 92 feed claws, 92a, 93a tip, 93 reverse rotation prevention claws, 94 motor, 94a, 95c output shaft, 95 transmission mechanism, 95a reduction gear, 95b rotating member, 96,98 spring, 100 load Reduction unit, 101,111 cam, 101a, 111a recess, 101b opening, 102a, 112a actuator, 102b, 112b contact part, E power supply, R1, R2 resistor, SW1, SW2 micro switch.

Claims (3)

The ratchet gear urged in the first direction by the input spring,
With the feed claw that engages with the ratchet gear,
A reverse rotation prevention claw that regulates the rotation of the ratchet gear in the first direction by the closing spring,
An output shaft is attached to a transmission mechanism provided between the feed claws, and by rotating the output shaft, the feed claws are moved via the transmission mechanism to move the ratchet gear in the opposite direction to the first direction. A motor that rotates in the second direction, which is the direction,
The ratchet gear rotated in the second direction by the feed claw is restricted from rotating in the first direction by the reverse rotation prevention claw until it is then rotated in the second direction by the feed claw. A breaker comprising: a load reducing portion for reducing the rotational speed of the motor during a period. The load reduction unit
A cam that rotates in synchronization with the rotation of the output shaft of the transmission mechanism,
The circuit breaker according to claim 1, further comprising an actuator that abuts on the cam and a switch having a contact portion that controls the motor based on the position of the actuator. On the outer edge of the cam
Concave or convex parts are formed
The actuator
In contact with the concave portion or the convex portion during the period,
The contact part is
When the actuator is connected to an electric circuit that supplies electric power to the motor and moves to a position where the actuator comes into contact with the concave portion or the convex portion, the electric power supplied to the motor is reduced or reduced to zero to reduce or eliminate the electric power of the motor. The circuit breaker according to claim 2, wherein the rotation speed is reduced.

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