JP2011048966A - Spring operating unit for circuit breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spring operating unit for a circuit breaker in which total downsizing is achieved by improving energy efficiency of a spring, and furthermore, which is considered environmentally friendly. <P>SOLUTION: In the spring operating unit for the circuit breaker of electric power installed with a breaking portion which carries out break and make of electric power by opening/closing a contact point formed by a fixed contactor 29 and a movable contactor 36, and a breaking spring 26 and a power input spring 28 for opening/closing the contact point by releasing energization of strain energy, as a means of storing braking energy generated when braking the movable contactor 36 at the end of breaking operation, a cylinder 37 in which gas is sealed inside and a piston 36 which is coupled with one end of a breaking spring link 25 and slides in the cylinder 37 are installed, and a high-pressure gas generated in the cylinder 37 is pressure-released when starting power input operation, and closing of the contact point and compression of the breaking spring 26 are supplemented. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a spring operating device in a power circuit breaker that increases energy efficiency and reduces the size of the entire apparatus.

  Conventionally, in an operating device using a spring as a power means of a circuit breaker, energy consumed for braking the movable contact at the end of the breaking operation of the breaker contact composed of the fixed contact and the movable contact is heat and It was radiated to the outside. By storing this abandoned braking energy as oil pressure and using it as an auxiliary force for the moving operation of the movable contact, the maximum force of the closing spring when closing the contact is reduced, reducing the size and weight of the actuator. Attempts have been made.

  As such braking energy storage means, for example, in a configuration in which a cylinder filled with an incompressible fluid such as oil and a piston slidable inside the cylinder are provided, first, the cutoff is performed by releasing the cutoff spring. The piston connected to the spring link mechanism is driven, the fluid pressure in the cylinder rises and is discharged to the flow path connecting the cylinder and the accumulator. The high-pressure fluid passes through a restriction provided in the flow path and is accumulated in the accumulator. Further, the high-pressure fluid accumulated in the accumulator is discharged into the cylinder through the check valve at the start of the charging operation, so that the piston is driven to compensate for the closing of the blocking portion and the compression of the blocking spring. . This is described in JP-A-2002-313195.

JP 2002-313195 A

  In the spring operating device described in Patent Document 1, it is necessary to provide an accumulator, a check valve, a throttle, and a pipe (flow path) that communicates these components for accumulating incompressible fluid. There was a problem that the entire operating device would become large. In addition, oil that has been widely used as an incompressible fluid in the prior art has a drawback in that it has an adverse effect on the environment when released to the outside.

  The present invention provides a spring operating device that uses the braking energy as an auxiliary force for the input spring energy, simplifies its constituent elements, is miniaturized, and is environmentally friendly. With the goal.

  In order to achieve the above-described goal, the spring actuator of the present invention opens and closes a contact made up of a fixed contact and a movable contact, and thereby interrupts and turns on power, and releases strain energy. As a means for accumulating braking energy generated when the movable contactor is braked at the end of a breaking operation in a spring actuator of a power breaker provided with a breaking spring for opening and closing the contact and a closing spring, A cylinder sealed with gas and a piston that is mechanically connected to the shut-off spring and slides in the cylinder are provided, and the high-pressure gas generated in the cylinder during the shut-off operation is released at the start of the charging operation. The contact point is closed and the circuit breaker spring is compressed.

  Furthermore, a gas filling port for adjusting the gas pressure in the cylinder and a valve for holding the sealed gas in an airtight manner are provided.

  The spring operating device according to the present invention is a conventional spring operating device using an incompressible fluid by using a gas as an operating medium of the spring operating device that utilizes braking energy as an auxiliary force of the input spring energy as described above. Since auxiliary elements such as accumulators, check valves, throttles, and pipes (flow paths) that communicate these elements are not required, the operating device can be reduced in size and simplified. In addition, since a gas such as air is used as an operating medium instead of conventional oil, there is no adverse effect on the environment even if it is released to the outside.

  Furthermore, by providing a gas filling port, a compressor or the like can be connected to the gas filling port, and the gas compressed to a constant pressure from the compressor can be taken into the cylinder, so the initial gas pressure in the cylinder can be easily adjusted. It becomes possible. Therefore, since the compression of the cutoff spring is supplemented with a larger braking energy without increasing the size of the components such as the cylinder and the piston, the maximum force of the closing spring can be reduced accordingly.

It is a structural diagram which shows the state at the time of interruption | blocking part injection | throwing-in of the spring operating device to which this invention is applied. It is a block diagram which shows the state at the time of the interruption | blocking part interruption | blocking of the spring operating device to which this invention is applied. It is a structural diagram which shows the state immediately after the interruption | blocking part injection | throwing-in operation | movement of the spring operating device to which this invention is applied. It is a structural diagram which shows the state which the completion | finish operation | movement of the interruption | blocking part of the spring operating device to which this invention is applied was complete | finished. It is a structural diagram which shows the spring operating device at the time of interruption | blocking part injection | throwing-in in the other Example of this invention.

  Hereafter, the structure of the spring operating device which implemented this invention is demonstrated based on figures. FIG. 1 shows the closing state of the circuit breaker. Both the breaking spring 26 and the closing spring 28 are composed of compression coil springs, and both are in a compressed state. Here, the cutoff spring 26 and the closing spring 28 may be other spring elements, for example, a disc spring, a spiral spring, a leaf spring, or the like.

  Reference numeral 29 denotes a fixed contact of the blocking portion, 32 denotes a movable contact, and FIG. One end of the movable contact 32 is rotatably connected to the lever 33. The other end of the lever 33 is connected to the main shaft 4 of the operating device. The main shaft 4 is rotatably supported by the housing 1 and is connected to the main lever 5. A lever or a link that amplifies the stroke length of the movable contact may be provided between the lever 33 and the movable contact 32.

  Next, means for accumulating strain energy in the cutoff spring 26 during the closing operation will be described. One end of the main lever 5 is connected to a cutoff spring link 25 that transmits a load of the cutoff spring 26 via a spring receiver 34. The other end of the cutoff spring link 25 is connected to a piston 36 that is slidable in a cylinder 37 in which part A is filled with air of a predetermined pressure. Further, since the sliding portion 43 between the piston 36 and the cylinder 37 is sealed, the air in the A portion is sealed in the cylinder 37, but the B portion on the opposite side of the piston 36 is always open to the atmosphere. Yes.

  A configuration for holding and releasing the strain energy accumulated in the breaking spring 26 when the breaker is turned on will be described. The rotation of the main lever 5 is prevented by the roller 7 engaging the inclined surface of the second blocking latch 8. The rotation of the second blocking latch 8 is prevented by the roller 10 provided at the other end engaging the slope of the blocking latch 11. Further, the rotation of the blocking latch 11 is prevented by the roller 13 provided at the other end engaging with the blocking trigger 14. The second cutoff latch 8, the cutoff latch 11, and the cutoff trigger 14 are provided with return springs 9, 12, and 15, respectively, and are always elastically biased. Further, the plunger of the shutoff solenoid 17 extends to the vicinity of the other end of the shutoff trigger 14. In the state of FIG. 1, the cutoff spring 26 is in a compressed state and tries to rotate the main lever 5 counterclockwise via the cutoff spring link 25, but the roller 7 is engaged with the latch 8. The state shown in the figure is maintained.

  Next, means for accumulating strain energy in the closing spring 28 will be described. A cam 3 and a large gear 53 are fixed to the rotatable cam shaft 2, and a small gear 52 driven by an electric motor (not shown) is engaged with the large gear 53. One end of a closing spring link 27 is connected to the cam 3, and the other end of the closing spring link 27 is elastically biased by the strain energy of the closing spring 28 via a spring receiver 35.

A configuration for holding and releasing the strain energy accumulated in the closing spring 28 by the above configuration will be described. The cam 3 is given a clockwise rotational force by the strain energy of the closing spring 28, but the rotation is prevented by the roller 18 provided at one end of the cam 3 engaging the slope of the closing latch 19. . The rotation of the closing latch 19 is prevented by the roller 21 attached to the other end being engaged with the closing trigger 22. The closing latch 19 and the closing trigger 22 are provided with return springs 20 and 23, respectively, and are always elastically biased.
Further, the plunger of the closing solenoid 24 extends to the vicinity of the other end of the closing trigger 22.

  Now, the description will proceed to the operation and action of the spring operating device. First, the breaking operation from the circuit breaker application state shown in FIG. 1 to the circuit breaker interruption state shown in FIG. 2 will be described. In FIG. 1, when a shut-off command is input, the shut-off solenoid 17 is excited, the plunger protrudes and presses the trip trigger 14, and the shut-off trigger 14 is rotated clockwise against the urging force of the return spring 15 to shut off. The engagement between the trigger 14 and the roller 13 of the blocking latch 11 is released.

  Since the blocking latch 11 is free to rotate, the engagement between the blocking latch 11 and the roller 10 of the second blocking latch 8 is released. Then, the second blocking latch 8 becomes free to rotate, rotates by the contact force from the main lever 5, and the engagement between the roller 7 of the main lever 5 and the second blocking latch 8 is released. The main lever 5 rotates the main shaft 4 clockwise as the strain energy of the cutoff spring 26 is released. As the main lever 5 rotates clockwise, the lever 33 moves to the left in the figure, so that the movable contact 32 is separated from the fixed contact 29 and is cut off.

Further, since the driving force of the cutoff spring 26 moves the piston 36 to the right side in the figure via the spring receiver 34 and the cutoff spring link 25, the air in the A portion in the cylinder is pressurized and stored as high-pressure air. As described above, since the braking energy generated when the movable contact 32 is braked in the shut-off operation is converted into air pressure and stored, the impact during braking of the movable contact is reduced. In particular, since air is sealed in the cylinder 37, the braking force acting on the piston 36 is small at the initial stage of the shut-off operation, and is greatest at the end of the shut-off operation, which is an ideal characteristic as a shock absorber. . That is, since the braking force is small at the initial stage of the interruption, the energy of the interruption spring is used to drive the movable contact 32.
Since the braking force is large near the end of the shut-off operation, the inertia energy of the movable part such as a lever or a link that transmits the driving force to the movable contact 32 can be absorbed.

  At the end of the shut-off operation, the roller 6 provided at one end of the main lever 5 is stationary in a state where it is substantially in contact with the outer surface of the cam 3. Further, the breaking spring 26 is in a completely released state, and the spring receiver 34 comes into contact with the left end face 50 of the cylinder 37 to reach the breaking state of the breaker shown in FIG. At this time, the pressure in the portion A in the cylinder is the highest.

  Next, the operation from the breaking state of the circuit breaker shown in FIG. 2 to the state where the closing operation shown in FIG. 4 is completed will be described. When a closing command is input in FIG. 2, the closing solenoid 24 is excited, the plunger protrudes and presses one end of the closing trigger 22. Then, the closing trigger 22 rotates clockwise around the axis against the urging force of the return spring 23, and the engagement between the closing trigger 22 and the roller 21 of the closing lever 19 is released.

  Next, the closing latch 19 rotates clockwise by the contact force from the roller 18 of the cam 3, and the engagement between the closing latch 19 and the roller 18 is released. Then, the cam 3 rotates clockwise by the release of the strain energy of the closing spring 28, contacts the roller 6 of the main lever 5 and rotates the main lever 5 counterclockwise, and immediately after the closing operation shown in FIG. To the state.

  Subsequently, the blocking spring 26 is compressed by the counterclockwise rotation of the main lever 5, and the lever 33 is moved in the right direction in the figure, so that the movable contact 32 and the fixed contact 29 are put into the engaged state.

  At this time, the high-pressure air accumulated in the A portion in the cylinder during the shut-off operation is released as energy supplementing the compression of the shut-off spring. Therefore, the maximum force of the closing spring is reduced by this auxiliary force.

  Subsequently, by the second half of the closing operation, the cam 3 is rotated halfway and comes into contact with the roller 6 of the main lever 5 at the maximum radius of curvature, so that the main lever 5 is overstroked from the position in the closing holding state. Therefore, first, the second cutoff latch 8 is returned to the original position by the return spring 9. Next, the shut-off latch 11 is returned to the original position by the return spring 12. Finally, the cutoff trigger 14 is returned to the original position by the return spring 15. Here, the closing trigger 22 and the closing latch 19 are also returned to their original positions by the respective return springs 23 and 20, and the closing operation of the circuit breaker shown in FIG. 4 is completed.

  Note that after the closing operation is completed, it is necessary to compress the closing spring. The closing spring is compressed by starting an electric motor (not shown), rotating the small gear 52 counterclockwise, and rotating the large gear 53 and the cam 3 meshing with the small gear 52 clockwise. . When the cam 3 rotates halfway, the motor stops and the closing spring force starts to be released. However, the cam roller 18 is engaged with the closing latch 19 and the closing latch 19 is engaged with the closing trigger 22 to hold the closing spring force. The circuit breaker is put into a closed state in which the breaking spring 26 and the closing spring 28 in FIG. 1 are compressed together.

  As described above, according to the present embodiment, a configuration using a conventional incompressible fluid by using a gas such as air as an operating medium of a spring operating device that utilizes braking energy as an auxiliary force of the input spring energy. Since auxiliary elements such as an accumulator, a check valve, a flow path, and a throttle, which are elements, are not required, the operating device can be reduced in size and simplified. In addition, since air is used instead of the conventional oil as the operating medium, it does not adversely affect the environment even if it is released to the outside.

  This is a modification of the structure of the braking energy storage means in the first embodiment. FIG. 5 shows a state in which the circuit breaker spring operating device according to the second embodiment of the present invention is put in, 46 is a gas filling port and 47 is a valve.

  By providing the gas filling port 46 in the cylinder 37, a compressor or the like (not shown) can be connected to the gas filling port 46, and gas compressed to a constant pressure from the compressor can be taken into the cylinder. The gas sealed by the valve is kept airtight.

  For this reason, according to this embodiment, the initial gas pressure in the cylinder can be easily amplified. That is, without increasing the size of components such as cylinders and pistons, more braking energy is accumulated and compression of the shut-off spring is compensated. Therefore, the maximum force of the closing spring is reduced correspondingly, and the operating device is reduced in size. I can do it.

3 cam 5 main lever 8 second shut-off latch 11 shut-off latch 14 shut-off trigger 17 shut-off solenoid 19 closing latch 22 closing trigger 24 closing solenoid 25 breaking spring link 26 breaking spring 27 closing spring link 28 closing spring 29 fixed contact 32 movable contact 36 Piston 37 Cylinder 46 Air sealing port 47 Valve

Claims (2)

  Provided are a shut-off portion that cuts off and puts in electric power by opening and closing a contact made up of a stationary contact and a movable contact, and a shut-off spring and a making-up spring that open and close the contact by releasing strain energy In the spring breaker of the power breaker, as means for accumulating braking energy generated when the movable contact is braked at the end of the breaking operation, a cylinder sealed with gas is connected to the breaking spring. A piston that is connected to one end of the link mechanism and slides in the cylinder is provided, and the high-pressure gas generated in the cylinder is released at the start of charging operation to compensate for the closing of the contact and compression of the circuit breaker spring. A circuit breaker spring actuator characterized by comprising the following.   2. The circuit breaker spring operating device according to claim 1, further comprising: a gas filling port for adjusting a gas pressure in the cylinder; and a valve for holding the sealed gas in an airtight manner.

Images