JP2529309B2 - Circuit breaker operating mechanism - Google Patents

Description

TECHNICAL FIELD The present invention relates to an operating mechanism for a circuit breaker.

[Conventional technology]

The operating responsibility of the power circuit breaker is O-0.35 sec-CO-1 min-CO for high speed switches, as shown in JEC-2300.

Here, O indicates that the opening operation is performed, and CO indicates that the opening operation is performed without delay after the closing operation.

Therefore, the operating mechanism of the circuit breaker is at least O
-0.35 seconds-CO operation, that is, energy for two opening operations and one closing operation needs to be stored before the first opening operation. That is, within the next one minute, there is a means to store CO energy, but it is difficult to store large energy in 0.35 seconds.

As another operation duty, there is a standard of CO-15 seconds-CO. In this case, if the energy required for CO can be stored in 15 seconds, the operation duty can be completed.

For example, the conventional examples shown in Japanese Utility Model Laid-Open No. 59-85546 and Japanese Patent Laid-Open No. 61-96619 are designed to satisfy the above-mentioned operational responsibilities.

Next, a conventional device that fulfills the operational responsibility as described above will be described.

3A to 3C show the structure of a conventional spring operating mechanism.

FIG. 3A shows a closed state, FIG. 3B shows an open state, and FIG. 3C.
Indicates the closing spring released state.

In the figure, reference numeral (100) is a movable contactor of the circuit breaker, and (1
01) turns on the movable contactor (100) and shuts off the spring (1
A cam for urging 03), (102) a closing spring for rotating the ratchet wheel (107) coaxially fixed to the cam (101) to perform a closing operation, and (104) a pin A. hand,
It is provided on the lever (109) and has a trip latch (106).
Is provided so that it can be engaged with. Reference numeral (105) is a trip trigger that locks or operates the trip latch (106). Further, the lever (109) is provided with a roller (109a) which engages with the cam (101) and operates the lever (109), and a portion opposite to the pin A (104) is provided with a cutoff spring (10).
3), and the tip of the protrusion at the center is the movable contact (10
0).

Next, (107) is a ratchet wheel, (108) is a cam shaft, and the cam (101), the ratchet wheel (107) and the cam shaft (108) are integrally fixed and rotate together. In addition, this nail wheel (107)
A closing spring (102) is connected to the pin B
(118) is provided, and the pin B (118) is locked by a plunger (112) operated by a closing electromagnet (113) or locked by a closing trigger (110) operated by a closing latch (111). ) Engage.

Next, (114) is the nail shaft, (115) is the nail, and the nail shaft (11
The claw (115) swings due to the rotation of the drive source (4) by a drive source (not shown), and the claw (115) rotates the ratchet wheel (107) by this swing.

Incidentally, (116) is a plunger of a trip electromagnet (117) for actuating the trip trigger (105).

 Next, the operation of the conventional device will be described.

In the circuit-opening operation, in FIG. 3A, the lever (109) is constantly given a rotational force (A ′) in the clockwise direction by the pressing force (arrow A) of the blocking spring (103) being urged. The rotational force (A ') is locked by the trip latch (106) to lock the pin A (104) and the trip trigger (105).
keeping.

Therefore, in this state, when the trip electromagnet (117) is excited and the plunger (116) projects in the direction of arrow B, the trip trigger (105) rotates counterclockwise,
Accordingly, the trip latch (106) disengages the pin A (104), and as a result, the lever (109) is rotated clockwise by the rotational force (A ') and is connected to the lever (109). Pull up the movable contact (100) that is open to shut it off.

 FIG. 3B shows this operation completed state.

 Next, the closing operation will be described.

In FIG. 3B, the closing spring (102) connected to the ratchet wheel (107) is urged to give a clockwise rotational force (C) to the cam shaft (108), and the rotational force is applied. (C)
The closing latch (111) engaged with the pin B installed on the ratchet (107) and the closing trigger (11) are stopped.
0) locks the rotation of the ratchet wheel (107). Therefore, when the closing electromagnet (113) is excited in this state and the plunger (112) operates in the direction of arrow D, the closing trigger (110) rotates counterclockwise (direction E), which causes The closing latch (111) unlocks the pin B (118) attached to the ratchet wheel (107). As a result, the cam (101) fixed to the cam shaft (108) is rotated clockwise by the rotational force (C), and the lever (109) is fixed to the roller (109a) fixed thereto. Has a cam (101)
It is pushed by and rotates counterclockwise, and as a result, the blocking spring (103) is compressed and the movable contact (100) is closed. That is, FIG. 3C shows a state in which the closing operation is completed and the pin A (104) is locked to the tripping latch (106) again.

 Next, the energizing operation of the closing spring will be described.

Immediately after completion of the closing operation, as shown in FIG. 3C, the closing spring (102) is in the released state, and the pawl shaft (114) is connected to the drive source through a gear (not shown). At the release position of the closing spring (102), the drive source is activated and the pawl shaft (114) rotates. Since the pawl shaft (114) is eccentric,
The two attached pawls (115) perform an oscillating motion, and the oscillating motion causes the ratchet wheel (107) to rotate in the clockwise direction to store the closing spring (102). At this time, the cam shaft (108) is given a rotational force in the clockwise direction at a position beyond the upper dead point of the ratchet wheel (107) of the closing spring (102),
This rotational force is retained by the engagement of the closing latch (111) with the pin B (118), and the state shown in FIG. 3A is restored.

In this state, no pawl is provided on a part of the ratchet wheel (107), and accordingly, even if the pawl (115) swings, the ratchet wheel (1)
No rotational force is applied to 07), the pawl shaft (114) spins idle,
Overload due to the rotation of the drive source can be prevented by the pawl (115) and the input latch (1
11) is not given to.

[Problems to be solved by the invention]

Since the conventional spring operation mechanism is configured as described above, when the activation source rotates the pawl shaft (114) to swing the pawl (115), the load on the drive source pulsates, and However, the energy efficiency of the drive source is poor, and as a result, a drive source with a large capacity is required, and the shape of the claw (115) is unavoidably pointed, so that a spring with a large spring load is required. There were problems such as difficulty in applying it to the operating mechanism.

The present invention has been made to solve the above-mentioned problems, and it is possible to obtain an operating mechanism of a circuit breaker which has no load pulsation, a drive source with a small capacity is sufficient, and has sufficient strength. To aim.

[Means for solving problems]

An operating mechanism of a circuit breaker according to the present invention is fixedly provided concentrically with a cam and has a large gear partially lacking teeth, meshes with the large gear, and is rotationally driven by a drive source. A small gear is provided, and a synchronous pawl having two swingable pawls is attached to the toothless portion of the large gear with one side thereof swingably supported, and the other side of the synchronous pawl is attached. Is configured to be pressed by a spring, and the small gear and the first tooth of the synchronous pawl are engaged with each other immediately after the closing spring is fully charged, and the second tooth of the synchronous pawl is engaged immediately after the closing operation is started. The small gear can smoothly re-engage with the large gear.

[Action]

In the operating mechanism of the circuit breaker according to the present invention, the large gear is rotated by the small gear when the closing spring is charged, and the large gear is charged. Therefore, there is no pulsation of the load on the drive source of the small gear, and the drive source rotates smoothly. Immediately after the closing spring is fully charged, the small gear meshes with the first tooth of the synchronous pawl formed in the toothless portion of the large gear, and the rotation of the small gear due to the inertia of the drive source is released by the swing of the coarse wood synchronous pawl, resulting in large vibration. The large constraint torque of the drive source is not applied to the gear and pinion. Further, during the closing operation, the second tooth of the synchronous pawl smoothly meshes with the small gear regardless of the swing position of the synchronous pawl that meshes with the small gear after the energy storage is completed. Re-engages with the teeth so that no excessive impact load is applied to the tooth surface.

〔Example〕

Hereinafter, the present invention will be described with reference to the drawings showing one embodiment.

FIG. 1A shows a closed state, FIG. 2B shows an open state, and FIG. 1C.
Indicates the closing spring released state.

In the figure, reference numeral (1) is a rotation main shaft of a lever (2), one end of a breaking torch bar (3) which is a breaking spring is fixed to the inside, and the rotation main shaft (1) is fixed by the breaking torch bar (3). That is, the lever (2) is given a rotational force in the counterclockwise direction.

Reference numeral (4) is a closing lever, and a link (5) is rotatably pin-connected to the tip of the closing lever (4). (6) is a closing main shaft, the closing main shaft (6) is a rotating main shaft of a closing lever (4), and a closing spring bar (7) is a closing spring inside the closing main shaft (6). Is fixed at one end thereof, and the loading main shaft (6) is given a rotational force in the counterclockwise direction by the loading torsion bar (7).

(8) is a large gear, (9) is a small gear, a part of the tooth portion of the large gear (8) is toothless, and in the energized state of the closing torsion bar (7) which is a closing spring, The small gear (9) is located on the toothless portion (8a) of the large gear (8). Further, the large gear (8) is rotatably supported at the opposite end of the closing lever (4) of the link (5) and is connected to the closing lever (4).

Reference numeral (11) is a cam for rotating the lever (2) via a roller (10) rotatably attached to the lever (2), and the cam (12) is connected to the large gear (8) via a cam shaft (12). They are connected to each other and rotate integrally with the large gear (8).

Reference numeral (12) is a shock absorber, which is connected to the lever (2) and absorbs the impact at the time of opening and closing operations.

Further, a groove portion is formed in the toothless portion (8a) of the large gear (8) as shown in FIG. 2A corresponding to FIG. 1A, and the pin (13) installed therein has a groove portion. Therefore, there is provided a synchronous pawl (14) mounted so as to swingably support one side, and the synchronous pawl (14) is constantly pressed by a spring (15) so as to push out the other side. Further, the swinging range of the synchronizing claw (14) is restricted by the groove. This sync nail (1
4) is composed of two teeth, and the first teeth of the synchronizing claw (14) are formed so as to mesh with the teeth of the small gear (9) immediately after the closing spring energy storage is completed.

Reference numeral (100) is a movable contact of the arc extinguishing chamber, which is connected to the lever (2) by a link mechanism (not shown).

Further, the reference numerals (104) to (106), (110) to (113) and (116) to (118) are the same as or equivalent to those in the conventional apparatus.

 Next, the operation of the above embodiment will be described.

In the circuit opening operation, as shown in FIG. 1A, the lever (2) is always given a counterclockwise rotational force by the breaking torch bar (3), and the rotational force is tripped to the latch (106) and It is held by a tripping trigger (105). Therefore, when the trip electromagnet (117) is excited in this state, the plunger (116) of the trip electromagnet (117) moves to the right in the figure, and the trip trigger (105) rotates clockwise. , The trip latch (106) is pin A (104)
It rotates counterclockwise by the reaction force from.

When the trip latch (106) is disengaged from the pin A (104), the lever (2) is rotated counterclockwise by the force of the shut-off torch bar (3), and the movable contactor (10) of the arc extinguishing chamber (10).
0) is driven in the blocking direction and opened.

 This operation completed state is shown in FIG. 1B.

Next, the closing operation is performed by the cam (1
Since 1) is connected to the closing lever (4) via the camshaft (12), the large gear (8) and the link (5), it is rotated clockwise by the force of the closing torsion bar (7). A force is applied, and its rotational force is held by the closing latch (11) and the closing trigger (110).

In this state, when the closing electromagnet (113) is excited, the plunger (112) of the closing electromagnet (113) moves to the right in the figure to rotate the closing trigger (110) clockwise, resulting in closing. The closing latch (111) held by the trigger (110) is released, and the closing latch (111) is rotated counterclockwise by the reaction force from the pin B (118) provided on the cam (11). Rotate to.

When the closing latch (111) is disengaged from the pin B (118), the cam (11) is moved by the force of the closing torch bar (7).
Roller (1) provided on the lever (2) is rotated clockwise through the loading lever (4) and the link (5).
0) is pushed up, and the lever (2) is driven clockwise while twisting the blocking torch bar (3) clockwise so that the movable contactor (100) is closed.

FIG. 1C shows that the loading operation is completed as described above.
Again, the pin A (104) is in a state of being held by being engaged with the tripping latch (106).

Since the closing torch bar (3) is energized while the closing torch bar (7) is deenergized, the charging energy of the closing torch bar (3) is larger than that of the breaking torch bar (3).

In addition, the charging operation of the input torch bar (7) is performed as follows.

As shown in FIG. 1C, immediately after the closing operation is completed, the closing torch bar (7) is in the released state. Further, the small gear (9) is connected to the drive source via a gear (not shown), and accordingly, the rotation of the small gear (9) in the counterclockwise direction causes the large gear (8) to move. It rotates in the clockwise direction by meshing with the small gear (9), and the charging torch bar (7) is rotated and stored energy through the link (5), the closing lever (4) and the closing main shaft (6). It This is the position where the pulling load direction of the link (5) exceeds the point where it crosses the center of the cam shaft (12), and the cam shaft (12) is driven by the force of the closing torch bar (7). ), The first tooth (14a) of the synchronous claw (14) of the large gear (8) meshes with the small gear (9).

Large gear (8) by the force of the input torch bar (7)
The clockwise turning force of the input latch (1
It is held by engaging 11). That is, it returns to the state shown in FIG. 1A again. In this state, even if the small gear (9) is rotated by the inertia of the drive source, the small gear (9) escapes due to the oscillating movement of the synchronous pawl (14), so the force from the drive source is transmitted to the large gear (8). Therefore, the latch (11
There is no excessive addition to 1) or pin B (118).

Moreover, due to the position where the rotation of the pinion gear (9) is stopped,
The swing position of the synchronizing claw (14) can be changed, for example, as shown in FIGS. 2B and 2C.

When the closing operation is performed from the state of FIG. 2B, the load F acts on the first teeth (14a) of the synchronous pawl (14) by the rotation of the large gear (8), but the synchronous pawl (14) is pushed in. Then, the second tooth (14b) of the next synchronizing claw (14) and the large gear (8) are smoothly meshed with the small gear (9).
That is, the rotation of the small gear (9) is transmitted from the small gear (9) to the large gear (8) when the input torsion bar (7) is energized. Although it is released by rocking, it is the rotation transmission from the large gear (8) to the small gear (9) during the closing operation, and the direction of the load acting on the synchronous pawl (14) is different, so the synchronous pawl is (1
4) does not swing, and the large gear (8) meshes smoothly with the small gear (9). Further, the position of the pin (13), the spring (15), etc. are, of course, adjusted so that the synchronizing claw (14) performs such an operation.

Further, when the closing operation is performed from the state of FIG. 2C, the second gear (14b) of the synchronous pawl (14) comes into contact with the small gear (9) by the rotation of the large gear, and the load F ′ acts, and the synchronous pawl is moved. (14) swings counterclockwise and is locked in the groove of the large gear (8),
The small gear (9) meshes with the second teeth (14b) of the synchronous pawl (14), and the large gear (8) can also mesh smoothly.

In the above embodiment, if the gear ratio of the large gear (8) and the small gear (9) is about 4 times, the teeth of the large gear (8) and the synchronous claw (which engage with each other at the end of the energy accumulation of the closing spring). The distance between 14) and the first tooth (14a) is 2 pitches between the teeth, and
Similarly, the spacing between the first tooth (14a) and the second tooth (14b) of the synchronous pawl (14) is set to 2 pitches, so that the pinion (9)
Interference with can be eliminated and it can be meshed smoothly.

In the above-mentioned embodiment, the torsion bar is used as the closing spring and the breaking spring, but a coil spring, a spiral spring or the like may be used. In addition, a spring (1
Although the coil spring is used in 5), it may be a spring such as a twist spring or a disc spring, and in any case, the same effect as that of the above-described embodiment is obtained.

〔The invention's effect〕

As described above, according to the present invention, the energizing device for the closing spring is provided concentrically with the cam, and is provided with a large gear partially lacking teeth, and the large gear meshes with and drives the large gear. A small gear driven to rotate by a power source, and a synchronous pawl having two swingable pawls is provided on the toothless portion of the large gear. Since one tooth is in a meshed position and the second tooth of the synchronous pawl is meshed immediately after the start of the closing operation, the load applied to the drive source during the energy accumulation does not pulsate, and the drive source with a small capacity is provided. In addition, a large-capacity closing spring can be stored in order to freely select the gear module, and when the storage is completed, an excessive load is not applied to the closing latch, and the small gear is used during the closing operation. And the large gear mesh smoothly with each other. Breaker operating mechanism of use has the effect of can be obtained.

[Brief description of drawings]

FIG. 1 is a structural view of a spring operating mechanism according to an embodiment of the present invention. FIG. 1A is a structural view in a closed state, FIG. 1B is a structural view in an open state, and FIG. 1C is a closing spring release. Structural drawing of momentum,
2 is a partial detailed view of FIG. 1, and FIG.
2B and 2C are explanatory views of an operation example at the initial stage of the closing operation, FIG. 3 is a conventional spring operating mechanism, and FIG. 3A is a closed circuit configuration. FIG. 3B is a configuration diagram in the open state, and FIG. 3C is a configuration diagram when the closing spring is released. (3) ... Breaking spring (breaking bar), (7)
...... Make-up spring (make-up torch bar), (8) …… Large gear, (8a) …… Toothless part, (9) …… Smear gear, (11)…
… Cam, (14) …… Synchronous claw, (14a) …… First tooth, (14
b) …… Second tooth. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

(57) [Claims] 1. A shutoff spring for performing a circuit opening operation by releasing the force, a closing spring for performing a circuit closing operation by a cam rotating by the force for releasing, and a closing spring for storing the energy of the closing spring by releasing the closing spring. In the operation mechanism of the circuit breaker, which includes a power storage device that stores the power of the cam while rotating the cam, the circuit breaker is fixedly provided concentrically with the cam, and partly lacks teeth to provide a groove. A large gear, a small gear that meshes with the large gear and is driven to rotate by a drive source, and one side of which is swingably supported by a groove of the large gear.
A synchronous pawl having two teeth, and a spring that is provided in the groove and presses the other side of the pawl.
Immediately after the completion of the energy storage of the closing spring, the small gear and the first tooth located on the other side of the synchronizing claw are in a position where they mesh with each other,
Further, the second tooth located on the one side of the synchronizing claw is formed so as to mesh with each other immediately after the start of the closing operation, and the small gear is configured to be able to smoothly re-mesh with the large gear. Circuit breaker operating mechanism.