JPH04206118A - Operating mechanism of breaker - Google Patents

Abstract

PURPOSE:To improve make operation and the speed of break operation with a simple construction by a method wherein a link consists of a triangle link whose one end is rocked with the top of the triangle link being by a closing cam and a rod connected between the one end of that triangle link and a main shaft. CONSTITUTION:When a making coil is energized, a making shaft 79 rotates and the upper end of a making catch 77 is disengaged from the bearing. Thereupon, a making cam 50 rotates clockwise, and then, a rod 62 whose upper end is connected to the front end of a triangle link 58 is pushed downward. Next, a main shaft 63 rotates counterclockwise, too, and a coupling rod 65 is pushed downward and a layer 75 rotates counterclockwise to move an operating rod 69 upward so that the contact of a vacuum valve 70 are closed. Next, when the upper end of a trip catch 72 is pushed backward by energizing a trip coil, the roller shaft of a layer 76 which engages to the rod 65 is discharged, and the main shaft 63 rotates clockwise, so that a driving lever 67 rotates clockwise to lower the rod 69 to open a contact 80. Concurrently, the link 58 is also rotated clockwise by upward movement of a rod 62 to create a make standby state. It is thereby possible to reduce loads applied by movements of the respective components.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a circuit breaker operating mechanism.

(Prior Art) An example of a conventional circuit breaker operating mechanism will be described with reference to FIGS. 3 to 5.

FIG. 3 shows the contact 1 of the circuit breaker in an open state, and the closing operation will be explained from this state.

Now, when the closing coil (not shown) is excited, the closing shaft 2 that is linked to this rotates clockwise (hereinafter referred to as clockwise rotation).
The input catch 3 whose left end is engaged with the input shaft 2
rotates clockwise about the pin 4, and is disengaged from the roller 6 attached to the upper input cam 5.

Then, due to the return force of the closing spring 7, the closing cam 5 rotates clockwise about the support shaft 8 as shown in FIG. is pushed out. As a result, as shown in the figure, a roller bearing 9 is placed at the upper end.
a second link 10 provided with a
Since the third link 11 connected to the upper end of 0 at the lower end extends substantially linearly, the upper end is connected to the second link 10, and the lever 13 integrated with the main shaft 12 swings to the right, causing the main shaft 12 to rotate clockwise. Then, the operating rod 14 whose upper end is connected to the lower right side of the lever 13 is driven downward, the contact 1 is closed, and the circuit breaker is closed.

When the closing operation is completed, the closing spring 7 is immediately charged with energy by the rotation of the electric motor (not shown) in preparation for the next closing operation, and at the same time the closing cam 5 is also rotated, and the closing state is reached as shown in FIG. is retained.

Next, the opening operation will be explained.

In FIG. 5, when a tripping coil (not shown) is excited and the tripping shaft 15 interlocked therewith rotates counterclockwise (hereinafter referred to as left rotation), it disengages from the trip catch 16. At this time, the trip catch 16 is connected to the circuit spring 1.
The trip lever 18 is receiving force to the right due to the action of 7.
Since it is connected to the trip lever 18, it rotates to the left about the support shaft 19, the left end of the trip lever 18 swings, and the entire trip lever 18 moves to the right. As a result, the second link 10 and the third link 11 are bent into a dogleg shape, and the main shaft 12 rotates to the left as shown in FIG. Extremely.

(Problems to be Solved by the Invention) However, in the operating mechanism of the circuit breaker configured as described above, the tripping force applied to the trip lever 18 and the trip catch 16 becomes small when the circuit is opened.

This is because the trip force provided by the opening spring 17 and the wipe spring 20 that applies pressure to the contact 1 at the time of closing is generated from the coupling pin 23 between the third link 11 and the link 22 which is freely rotatably fitted with the pin 21. Since the information is transmitted to the trip catch 16 by the trip lever 18 arranged horizontally, the support shaft 1
This is because the rotational force in the trip direction of the trip catch 16, which swings about the axis 9, can be kept small.

This is to reduce the force applied to the trip catch portion when the trip is made, and to enable tripping even with a small electromagnetic force of a coil, such as current tripping.

However, as is well known, the breaking performance of a circuit breaker is better as the opening speed of the contacts is faster, and the initial opening speed at the initial stage of opening is particularly effective.

Therefore, if the above-mentioned tripping force applied to the trip cap portion is small, the operating speed of the operating mechanism components is also slow, and in particular, it is difficult to expect an improvement in the initial opening speed at which the contact begins to open.

Moreover, with the above configuration, in order to obtain a predetermined operating stroke, the horizontal stroke of pushing out the roller bearing 9 with the closing cam 5 is changed to the vertical direction, so it is necessary to take a large initial horizontal stroke. In addition, since the roller bearing must be supported by the charging cam 5 in order to maintain the closing state, not only the charging cam 5 becomes large, but also the charging catch 3, the charging cam 5. Lever 13. The shapes of the trip catch 16 and the trip lever 18 become complicated. SUMMARY OF THE INVENTION An object of the present invention is to provide a circuit breaker operating mechanism that has a simple structure, increases the speed of closing and opening operations, and improves breaking performance.

[Structure of the invention]

(Means and effects for solving the problem) The present invention has a closing cam that is released by rotation of the closing shaft and swings by the return force of the closing spring, and a closing cam that is pressed and driven by the swinging of the closing cam and is pressed against the main shaft. In a circuit breaker operating mechanism with connected links,
The link is composed of a triangular link whose top is pressed by the swinging input cam and whose one end swings, and a rond connected between one end of this triangular link and the main shaft. This is a circuit breaker operating mechanism that drives the circuit breaker to increase the speed of closing and opening operations with a simple structure and improves the circuit breaker's breaking performance.

(Example) Hereinafter, one example of the operation mechanism of the circuit breaker of the present invention will be described with reference to the drawings.

FIG. 1 is a front view of the operation mechanism of the circuit breaker of the present invention, and FIG. 2 is a right side view of FIG. 1, each showing a state in which the circuit breaker is ready for closing.

In FIGS. 1 and 2, a left side plate 83A and a right side plate 83B are attached vertically and in parallel to the rear front side of the outer frame 52, and an auxiliary side plate 83C bent into an L shape is also attached to the right side of the right side plate 83B. Mounted vertically and parallelly, the outer frame 5
A U-shaped support frame 5 (not shown in the plan view) is located on the rear surface of the lower end of 2.
A mounting plate 83b is fixed horizontally to the upper portions of the left side plate 83A and the right side plate 83B, and a support rod 83a is also provided horizontally through the upper end.

Of these, an electric motor 84 equipped with a speed reduction mechanism (details omitted) is fixed to the mounting plate 83b with the output shaft of the speed reduction mechanism protruding downward from the mounting plate 83b, and a small diameter helical gear 85 is attached to this output shaft. Mounted facing downwards.

A large-diameter helical gear 86 meshes with this helical gear 85, and a shaft fitted and fixed to this helical gear 86 is attached to the left side plate 83A and the right side plate 83B via bearings (not shown). , a small-diameter spur gear 87 is fixed to the right end of this shaft.

A charging cam shaft 51 is provided horizontally at the lower rear of the spur gear 87, penetrating the left side plate 83A, the right side plate 83, and the auxiliary frame 83C horizontally. 50 and a large-diameter spur gear 88 are fixed on the left and right sides, and the spur gear 88 meshes with the spur gear 87. Furthermore, the input camshaft 51 has a right side plate 83B and an auxiliary frame 8.
3C, and a spring link 54 is fixed to both ends of the spring link 54. Between the tip of the spring link 54 and both ends of the support frame 83a at the upper end, there is a charging lever 57 in a stored state. A spring 53 is attached.

Furthermore, a fixing pin 59 is provided horizontally at the lower rear of the input camshaft 51 with both ends fixed to the left side plate 83A and the right side plate 83B, and the rear end of the triangular link 58 is fitted into this fixing pin 59. , a roller bearing 60 is installed at the apex of this triangular link 58.
is attached, and a pin 61 is inserted laterally into the front end.

In addition, a fixing pin 78 is installed laterally in front of the lower part of the fixing pin 59 between the right side plate 83B and the auxiliary side plate 83C, and the middle part of the input catch 77 is swingably attached to the fixing pin 78. Further, a spiral spring (not shown) is attached to rotate the closing catch 77 counterclockwise, and the upper end of this closing catch 77 is connected to the roller bearing 56 at the tip of the closing cam 57.
The front surface of the lower end is rotatably inserted between the left side plate 83A and the right side plate 83B. , and a stopper pin 77a is provided at the rear of this input shaft 79.

Similarly, in front of this input shaft 79, a trip shaft 93 having the same shape as this input shaft 79 is provided with a right side plate 83B and an auxiliary side plate 83C.
A half-moon-shaped notch is inserted between the two so as to be rotatable, and a lever 94 is fixed to the trip shaft 93 so as to protrude downward. A stopper pin 91 is inserted between the right side plate 83b and the auxiliary side plate 83C.

Further below this stopper pin 91, a pin 74 is provided between the right side plate 83B and the auxiliary side plate 83C via a bearing 73, and the intermediate portion of the trip catch 72 is attached to this pin 74. A spiral spring (not shown) is attached to rotate the trip catch 72 counterclockwise, and the upper left front surface of the trip catch 72 is attached to the stopper pin 9.
The right front surface of the upper end faces the lower end of the lever 94.

On the other hand, a main shaft 63 rotatably fixed to the outer frame 52 passes through the front end of a groove 83C, which is formed by opening the rear part in the lower part of the left side plate 83A and the right side plate 83B.
There is a lever 64 in the center between the left side plate 83A and the right side plate 83B.
A lever 95 and a lever 75 are fixed to the outside of the right side plate 83B. Among these, the lower end of the rod 62 is connected to the front end of the lever 64 via a connecting pin 82.

Roller bearings 76 are attached to the front ends of the levers 75, the upper ends of the rods 62 are connected to pins 61 at the front ends of the triangular links 58, and the upper ends of the connecting pins 82 are locked to the support plates at the rear ends of the outer frame 52. The lower end of the opened circuit spring 81 is locked.

Further, a damper 96 is vertically attached to the rear of the lower end of the outer frame 52, the lower surface of the rear end of the lever 95 is now in contact with the upper end of the damper 96, and a support shaft 68 is attached to the center of the support frame 55. The intermediate part of a drive lever 67 is fitted into this support shaft 68, and a pin 66A is rotatably attached to the front end of this drive lever 67.A connecting rod that can be adjusted to expand and contract is attached to this pin 66A. The lower end of the connecting rod 65 is connected, and the connecting pin 82 at the front end of the lever 64 passes through the upper end of the connecting rod 65.

On the other hand, the lower end of an operating rod 69 is connected to the connecting pin 66B at the rear end of the drive lever 67 via a wipe spring 90, and the upper end of this operating rod 69 is connected to the lower end of a movable shaft 71 of a vacuum valve 70. There is.

Also, a closing coil 89 attached to a circuit breaker (not shown)
An interlocking shaft (not shown) connected to the movable portion of the tripping coil 92 is connected to the closing shaft 79 and the tripping shaft 93, respectively.

Next, the operation of the circuit breaker operating mechanism configured as described above will be explained.

Now, when the closing coil 89 is excited by an external closing command, the closing shaft 7 connected to the interlocking shaft of this closing coil 89
9 rotates clockwise in FIG. 2, disengaging from the lower end of the upper closing catch 77, and the closing catch 77 rotates clockwise about the fixing pin 78, and the upper end disengages from the roller bearing 56.

Then, the closing cam 50 also rotates clockwise due to the return force of the closing spring 53, and the roller bearing 60 is pushed down on the lower surface of the closing cam 50, and the rod whose upper end is connected to the front end of the triangular link 58 via a pin 61. Push down on 62.

Next, the main shaft 63 also rotates to the left along with the lever 64 which is pushed by the rod 62 through the connecting pin 82 and rotates, the connecting rod 65 is pushed down, and the lever 75 rotates to the left.
The roller bearing 76 pushes the lower end of the tripping catch 72 forward and engages with the lower end surface, and as the front part of the drive lever 67 lowers, the rear part moves upward as shown by the dashed line, and the wipe spring 90 Move the operating rod 69 upward and move the movable shaft 71
is operated to close the contact of the vacuum valve 70.

As a result, the opening spring 81 is in a tensioned state, and the roller bearing 76 at the tip of the lever 75 is engaged with the tripping catch 72, so that the operating mechanism is maintained in the closed state.

Next, the opening operation will be explained.

Now, when the tripping shaft 93 is rotated to the left by the excitation of the tripping coil 92 and the upper end of the tripping catch 72 is pushed backward by the lever 94, the lever engaged with the lower end surface of the tripping catch 72 rotated to the right. When the roller bearing 76 comes off, the main shaft 63 rotates clockwise due to the return force of the opening spring 81 and the wipe spring 90, and the drive lever 67 rotates clockwise via the connecting rod 65, allowing the operating rod 69 and movable shaft 71 to be lowered. At the same time as the contact 80 is opened, the upward movement of the rod 62 also rotates the triangular link 58 to the right, resulting in the closing and holding state shown in FIG. On the other hand, the lower surface of the rear end of the lever 95 hits the upper end of the damper 96, so that the impact caused by the opening operation of the main shaft 63, etc. is buffered, and the lever 95 is stopped at a predetermined angle by a stopper (not shown).

As a result, in the operating mechanism of the circuit breaker configured as described above, when closing, the triangular link 5 is rotated by the rotation of the closing cam 50.
The downward movement of 8 directly moves the rod 62 downward to drive the main shaft 63, and even when it is tripped, it is configured to drive in the direction in which the force of the opening spring 81 is applied. Since the load can be reduced and the opening operation is smooth and fast, the opening speed of the vacuum valve can be increased.

In addition, since the tripping catch 72 maintains the closed state by engaging the lever 76 of the main shaft 63, which has a large driving force, the large tripping force drives each component from the moment the contact is opened, and especially the initial opening speed. It is possible to increase the current and cut-off performance.

Furthermore, since the closing cam 50 is the only component with a complicated shape, the circuit breaker operating mechanism has a simple structure and is easy to manufacture.

〔Effect of the invention〕

As described above, according to the present invention, a circuit breaker is provided with a closing cam that is unlocked by the rotation of the closing shaft and swings by the closing spring, and a link that is pressed and driven by the swinging of the cam and is connected to the main shaft. In the operation mechanism, the link is composed of a triangular link whose top part is pressed by the swinging throw-in cam and whose one end swings, and a rod connected between one end of this triangular link and the main shaft. Since the rod is driven in the pressing direction, it is possible to obtain a circuit breaker operating mechanism that has a simple structure, has fast closing and opening operations, and can improve the circuit breaker's breaking performance.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the circuit breaker operating mechanism of the present invention, Fig. 2 is a right side view of Fig. 1, and Fig. 3 is a diagram showing an example of the conventional circuit breaker operating mechanism. FIG. 4 is a diagram showing the circuit breaker in the open state, FIG. 4 is a diagram showing the closing process, and FIG. 5 is a diagram showing the circuit breaker in the closed state. 50. Closing cam 53. Closing spring 58. Triangular link 62. Rod 63. Main shaft
79・Closing shaft 81... Opening spring (7317) Agent Patent attorney Noriyuki Chika 1st
Figure 2

Claims (1)

[Claims] A circuit breaker comprising a closing cam that is unlocked by rotation of a closing shaft and swings by the return force of a closing spring, and a link that is pressed and driven by the swinging of the closing cam and connected to the main shaft. In the operating mechanism, the link includes a triangular link whose top part is pressed by the swinging input cam and whose one end swings, and a rod connected between the one end of the triangular link and the main shaft. A circuit breaker operating mechanism characterized by: