JP3738591B2 - Circuit breaker operating device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electrically operated operating device that performs an opening / closing operation of a circuit breaker.
[0002]
[Prior art]
An example of a conventional circuit breaker operating device is shown in FIGS. FIG. 3 is a view showing a state where the circuit breaker is closed and the closing spring and the breaking spring are stored, and FIG. 4 is a cross-sectional view of the main part at this time. The operating device is configured as follows. The closing cam 1 has a cam roller 2 rotatably provided therein, and is rotatably supported around the camshaft 3 in the figure. It is locked by a closing latch 4 and a catch 6 via a cam roller 2. The camshaft 3 is linked to a motor 29 via a gear reduction mechanism 28. The catch 6 is supported by an indicator (not shown) so as to be rotatable integrally with the support pin 7 interlocked with the closing coil 26. A catch case 9 disposed so as to wrap the catch 6 and having the same rotation axis as that of the catch 6 is held at the position of the catch 6 by a spring 10. In the case of the catch case 9, a rotatable roller 8 is provided at an engaging portion with the closing latch 4. The closing latch 4 is rotatably supported by the support pin 5, and engages one end with the cam roller 2 and the other end with the catch 6 via the roller 8 to hold the closing cam 1 in the accumulating position. . At this time, the closing latch 4 receives an acting load due to the accumulation of the closing spring 30 from the closing cam 1 via the cam roller 2 and is biased clockwise.
[0003]
The main lever 11 has a rotatable roller 12 and a lever 14 held by a spring 15 so that one end of the main lever 11 is engaged with the roller 12 and is rotatably supported by a shaft 13. The main lever 11 is biased in the counterclockwise direction about the shaft 13 by the accumulating force of the cutoff spring 31. The force is received by the catch 21 via the lever 14 and the cutoff latch 16, and the main lever 11 11 is held in the stored position. An operating lever 34 for closing / opening the circuit breaker is connected to a connecting rod 33 that connects the shaft 13 and the interrupting spring 31. The catch 21 is supported by an indicator (not shown) so as to be rotatable together with the support pin 22 interlocked with the cutoff coil 27. A catch case 24 arranged so as to wrap around the catch 21 and having the same rotation axis as that of the catch 21 is held in a position with the catch 21 by a spring 25. In addition, the catch roller 24 is blocked by a rotatable roller 23. It is provided at the engaging portion with the latch 16. The shut-off latch 16 is rotatably supported by the support pin 17, and engages one end with the catch 21 through the roller 23 and the other end with the lever 14 through the roller 18, and acts by accumulating the shut-off spring 31. It receives a load and is urged counterclockwise. A latch case 19 arranged so as to wrap around the blocking latch 16 and having the same rotation axis as that of the blocking latch 16 is held at the position of the blocking latch 16 by a spring 20. The latch case 19 is rotatably provided at a position where the roller 18 engages with the lever 14.
[0004]
Next, the operation will be described. FIG. 5 shows a cross-sectional view of the main part in the open circuit state. When performing the opening operation, the interrupting coil 27 is excited and the catch 21 is rotated clockwise. Then, the catch 21 and the shut-off latch 16 via the roller 23 are disengaged, and the shut-off latch 16 rotates counterclockwise by the biased applied load, and the engagement with the lever 14 via the roller 18 is released. Come off. As a result, the main lever 11 is suddenly rotated counterclockwise by the breaking spring force due to the opening of the breaking spring 31, and at the same time, the operating rod 33 is suddenly pulled in the left direction in FIG. 3 to complete the circuit breaker opening. At this time, the main lever 11 stops rotating at a position where the outer peripheral surface of the roller 12 is engaged with the outer peripheral surface of the closing cam 1 rotating in the same plane.
[0005]
When the closing operation is performed, the closing coil 26 is excited and the catch 6 is rotated counterclockwise. Then, the catch 6 via the roller 8 and the closing latch 4 are disengaged, and the closing cam 1 is suddenly rotated clockwise by the load of the closing spring 30. The closing cam 1 is engaged with the roller 12 of the main lever 11, and simultaneously pushes up the roller 12 when performing a rotational movement, and the main lever 11 is locked to the blocking latch 16 via the lever 14 and the roller 18. The input is completed. As a result, the breaking spring 31 is also stored at the same time as the circuit breaker is completely charged. At the same time as the closing is completed, power is supplied to the motor 29, the closing spring 30 is stored via the gear reduction mechanism 28, the camshaft 3 and the connecting rod 32, and the closing cam 1 is engaged with the closing latch 4 and the catch 6. In combination, the closing spring 30 is held in a stored state to prepare for the next circuit breaker operation.
[0006]
[Problems to be solved by the invention]
In the closed state of the circuit breaker, as shown in FIG. 6, when the interrupting latch 16 is engaged with the lever 14 via the roller 18, the interrupting latch 16 receives an acting load F due to accumulation of the interrupting spring 31. The acting load P1 to be rotated counterclockwise, which is a component force of the acting load F, acts on the shut-off latch 16, and the load P2 acts on the catch 21 from the shut-off latch 16 via the roller 23. At this time, when the blocking latch 16 and the roller 18 are engaged at an appropriate position, a load as designed is transmitted from P1 to P2, and the necessary torque T of the blocking coil 27 connected by the catch 21 and the support pin 22 is transmitted. Is constant. Accordingly, a stable circuit breaker breaking time (opening time) can be obtained, and it is possible to cope with an extremely strict operating time duty of “20 ± 1 ms”.
[0007]
However, in the conventional circuit breaker operating device as described above, improper engagement may occur between the breaking latch 16 and the roller 18. During closing operation, while the closing cam 1 pushes up the main lever 11, the outer peripheral portion of the lever 14 comes into contact with the roller 18, the moment the roller 18 enters the overrun, the roller 18 is repelled and vibrates on the engagement surface of the blocking latch 16. . After the main lever 11 exceeds the top dead center, the overrun is completed, and the lever 14 and the blocking latch 16 are engaged via the roller 18. If the vibration of the roller 18 continues during this engagement, the roller 18 and the blocking latch 16 may engage at an inappropriate position as shown in FIG. Due to the displacement d of the position of the engagement point, the acting load P1 acting on the blocking latch 16 varies, and the load P2 is not properly transmitted to the catch 21 and decreases. As a result, the engagement between the catch 21 and the interruption latch 16 is disengaged with a slight vibration, or the interruption time (opening time) is unstable due to an unstable operation of the catch 21 with respect to the torque T of the interruption coil 27. There was a problem of becoming.
[0008]
The present invention has been made in order to solve such a problem. By regulating the engagement position of the roller 18 when the lever 14 and the interruption latch 16 are engaged, a predetermined load is applied to the interruption latch 16. An object of the present invention is to provide a highly reliable circuit breaker operating device capable of performing a stable opening and closing operation.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, a closing spring that is stored by a motor via a speed reduction mechanism, and a blocking spring that is stored by a biasing force of the closing spring and provides an operating force to the circuit breaker, As a part of a transmission mechanism for transmitting a driving force between the closing spring and the shut-off spring, a main spring for accumulating a shut-off spring, a lever rotatably attached to the main lever, and the lever In the operating device of the circuit breaker in which the main lever, the lever, the roller, and the interruption latch are arranged so that the action line of the force at the time of the engagement is in the same plane. A protrusion is provided on the outer periphery of the lever so that the roller engaged with the lever is engaged at an appropriate position, and the engagement position of the roller is mechanically adjusted.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. Since the circuit opening operation of the circuit breaker operating device and the storing operation of the closing spring according to the present invention are the same as those in the prior art, they will be omitted, and the operation and effect during the circuit closing operation, which is the object of the present invention, will be described. FIG. 1 is a cross-sectional view of a main part in a closed state, and FIG. The configuration according to the embodiment of the present invention is the same as that of the prior art except for the lever 14. However, in the embodiment of the present invention, a protrusion 50 is provided on the outer peripheral portion of the lever 14, and the conventional unstable movement is achieved. The engagement position of the roller 18 that has been operated is regulated, and a predetermined load is applied to the blocking latch 16 so that a stable opening / closing operation can be performed. During the closing operation, as in the prior art, while the closing cam 1 pushes up the main lever 11, the outer peripheral portion of the lever 14 comes into contact with the roller 18, and the momentary roller 18 entering the overrun is repelled, and the interruption latch 16 is engaged. Although it vibrates on the surface, the vibration range is immediately regulated by the protrusion 50 provided on the outer periphery of the lever 14. After the main lever 11 exceeds the top dead center, the overrun of the lever 14 is completed, and the lever 14 and the interruption latch 16 are engaged via the roller 18. During this time, the vibration range of the roller 18 continues to be regulated by the protrusion 50, and the roller 18 is engaged at an appropriate position. As a result, a predetermined working load can be transmitted from the lever 14 to the cutoff latch 16, and a stable opening / closing operation can be realized by making the required torque T of the cutoff coil 27 constant.
[0011]
【The invention's effect】
According to the present invention, in the engagement between the lever and the breaking latch during the closing operation of the circuit breaker, the engagement position of the roller can be regulated by the protrusion provided on the outer peripheral portion of the lever, and the engagement at the proper position is achieved. Thus, it is possible to provide a highly reliable circuit breaker operating device that performs a stable opening and closing operation by applying a predetermined load to the breaker latch.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an essential part in a closed state of an operating device for a circuit breaker according to the present invention.
FIG. 2 is a cross-sectional view of the main part at the time of overrun in the closing operation of the circuit breaker operating device of the present invention.
FIG. 3 is a schematic explanatory view of a conventional circuit breaker operating device in a closed state and in a closing spring accumulation state.
FIG. 4 is a cross-sectional view of a main part of a conventional circuit breaker operating device in a closed state.
FIG. 5 is a cross-sectional view of a main part in an open circuit state of a conventional circuit breaker operating device.
FIG. 6 is a schematic view showing an appropriate engagement state of main parts in a conventional circuit breaker operating device.
FIG. 7 is a schematic view showing an improper engagement state of a main part in a conventional circuit breaker operating device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Input cam 3 Cam shaft 11 Main lever 12 Roller 13 Shaft 14 Lever 15 Spring 16 Shut off latch 17 Support pin 18 Roller 19 Latch case 20 Spring 21 Catch 22 Support pin 23 Roller 24 Catch case 25 Spring 50 Projection

Claims (1)

A closing spring that is stored by a motor via a speed reduction mechanism, a blocking spring that is stored by a biasing force of the closing spring and applies an operating force to the circuit breaker, and a driving force between the closing spring and the blocking spring. As a part of the transmission mechanism for transmitting, a main lever for storing a cutoff spring, a lever rotatably attached to the main lever, and a cutoff latch for locking the lever via a roller are provided, In the circuit breaker operation device in which the main lever, lever, roller, and breaker latch are arranged so that the line of force applied when locking is in the same plane, the roller that engages the lever moves on the outer periphery of the lever An operating device for a circuit breaker, characterized in that a protrusion is provided in a direction in which the pin is constrained.

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