JP3271512B2 - Circuit breaker double closing prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for mechanically preventing a double closing operation of a circuit breaker.

[0002]

2. Description of the Related Art FIG. 7 is an exploded view of a main part of a conventional circuit breaker which is closely related to the present invention. The figure is partially simplified in order to prevent unnecessary complication. In the figure, 1 is the main contact of this circuit breaker, 10
Numeral 0 is a frame of the circuit breaker. Reference numeral 67 denotes an output pin for driving the main contact 1. Reference numeral 50 denotes an output lever to which an output pin 67 is connected. The output lever 50 is fixed to a main shaft 49 rotatable with respect to the frame 100, and opens a main contact 1 shown in FIG.
8 and a second angular position 102 for closing the main contact 1 shown in FIG. 8B.

FIG. 7 is a diagram showing a state in which the camera is at a first angular position 101. In the drawing, reference numeral 99 denotes an auxiliary line for indicating the horizontal direction. 61 is the frame 100 and the output lever 5
The trip spring is suspended between 0 and 0. 57 is a large gear driven in one direction by the electric motor 2 and the driving pawl 3,
Reference numeral 48 denotes a cam shaft rotated by the large gear 57.

A cam 69 rotates together with the cam shaft 48 and kicks the output lever 50 every rotation. 51 is the cam 6
9 is a trip latch for keeping the output lever 50 kicked and moved by 9 at the second angular position 102 (the main contact 1 is closed). Reference numeral 60 denotes a closing electromagnet which raises (depresses) the plunger 68 in response to a closing command signal (not shown). The closing command signal is sent from a push button provided on the panel of the circuit breaker or another control device.

The plunger 68 raises the latch 7. Reference numeral 58 denotes a closing trigger which is pulled up by the plunger 68 together with the latch 7 and rotates about the trigger shaft 55. When there is no closing command signal, the closing trigger is pushed by the return spring 65 and is at the lower standby position. , The plunger 68 is lifted by the plunger 68 and moves (rotates) to the upper operating position only when the main contact 1 is in the open state.

Reference numeral 63 denotes a large gear 57 fixed to the cam shaft 48.
When the closing trigger 58 is at the standby position, the leading end of the closing trigger 58 contacts the B pin 63 to prevent the large gear 57 from rotating. 5 is the main shaft 4
9 is a link rod connected to the output lever 50 and moved together with the output lever 50, and is pushed down when the output lever 50 is at the first angular position 101.

Reference numeral 77 denotes an interlock spring rotatably connected to the other end of the link rod 5, and is rotatably supported on the frame 100 together with the closing trigger 58 by a trigger shaft 55. The other end of the interlock spring 77 is a latch 7
Is to hang on

Next, the operation will be described. When a power supply (not shown) is connected, the large gear 5
7 rotates counterclockwise and stops when the closing spring 62 is compressed and charged. At this time, the output lever 50 is at the first angular position 101. At this time, the closing trigger 58 is set to the B pin 6
At 3, the rotation of the large gear 57 is prevented.

When a not-shown input command signal is input, the input electromagnet 60 attracts the plunger 68, the input trigger 58 is pulled up, and the B pin 63 is released. At this time, since the output lever 50 is in the first angular position 101, the link rod 5
Is pulled down, and the interlock spring 77
The hatch 7 has deviated from the bet 7 and has not stopped the movement of the bet 7.

When the closing trigger 58 is disengaged from the B pin 63, the large gear 57 and the cam 69 start rotating.
Since the cam 69 opens the output lever 50, the output lever 50 moves to the second angular position 102 and closes the main contact 1.

When the output lever 50 moves to the second angular position 102, the link bar 5 is pushed upward,
The leading end of the interlock spring 77 pushes the latch 7 downward against the force of the electromagnet 60, so that the closing trigger 58
Is applied to the B pin 63 again, and the rotation of the large gear 57 stops.

The other end of the interlock spring 77 is hooked on the latch 7. When the main contact 1 is in the closed state (ie, when the lever 50 is at the second angle position 102), the interlock spring 77 is hooked. It pushes down the gold 7 and prevents even if the plunger 68 is pulled up by the electromagnet 60, so that the so-called double throwing of the cam 69 running idle even though the main contact 1 is thrown is prevented. You.

[0013] The system for preventing double closing uses not only the mechanical mechanism described above but also an electrical mechanism for cutting off the circuit of the electromagnet 60 when the main contact 1 is closed. Have been. As a backup for such an electrical mechanism, a mechanical double-input preventing device is used for a secondary purpose.

[0014]

Since the conventional mechanical protection device for double closing of a circuit breaker is constructed as described above, its function is secondary, but its structure is complicated. There was a problem to say that.

The present invention is to provide a double-input mechanical prevention device whose structure is ultimately simplified in order to solve the above-mentioned problems.

[0016]

According to a first aspect of the present invention, a double closing prevention device for a circuit breaker according to the present invention rotates a cam from a first angular position corresponding to an open state of a main contact to a second angular position corresponding to a closed state. An output lever fixed to an output shaft driven to an angular position and connected to a main contact is provided on the output lever, and when the output lever is in the second angular position, the closing trigger is activated. It has a double closing prevention pin that presses to the standby position and does not contact the closing trigger when the output lever is at the first angular position.

According to a second aspect of the present invention, there is provided a double throw prevention device having an L-shaped portion which is supported by a bearing provided on an output lever in parallel with an output shaft, and includes at least one bent portion. A double insertion prevention pin configured to slidably penetrate a fulcrum hole provided in the frame body on a side where the bearing is not provided with respect to the bent portion, and to contact a closing trigger near the front end.

The double insertion prevention device according to the third invention has an oval hole long in the movable direction of the insertion trigger as a fulcrum hole.

The double insertion preventing device according to the fourth invention has a guide hole provided in the insertion trigger.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. 1 shows a main part and an assembly perspective view of a circuit breaker using a double closing prevention device according to Embodiment 1 of the present invention. In the following description of the embodiment, the case where the input electromagnet is of the push-down type, which is the reverse of the conventional example, will be described, but there is no fundamental difference. In the figure, 1 is a main contact of the circuit breaker, and 100 is a frame of the circuit breaker. Reference numeral 67 denotes an output pin for driving the main contact 1, and the drawing is simplified. 50 is output pin 6
Reference numeral 7 denotes a connected output lever, which is fixed to the main shaft 49 rotatable with respect to the frame body 100, and has a first angular position 101 for opening the main contact 1 and a second angular position 102 for closing the main contact 1. FIG. 1 shows a state at the second angular position 102.

Reference numeral 99 in each drawing denotes an auxiliary explanation line indicating the horizontal direction. 61 is a trip spring suspended between the frame 100 and the output lever 50. A cam 69 is fixed to the cam shaft 48 (driven by an electric motor or the like, not shown), rotates with the cam shaft 48, and opens the output lever 50 every rotation.

Reference numeral 51 denotes a second angular position (main contact closed position) 1
02 is a tripping latch for holding at 02. Reference numeral 60 denotes a closing electromagnet, which pushes the plunger 68 by a closing command signal (not shown, such as a push button provided on the panel of the circuit breaker or transmitted from another control device).

Reference numeral 58 denotes a shaft 55 which is pushed by a plunger 68.
When there is no input command signal, the return spring 65 pushes the return spring 65 to the standby position. When the input command signal is input, the plunger 68 pushes the main contact 1 to open the main contact 1. Only when in the state, it moves (rotates) to the operating position 581 shown in FIG. Reference numeral 63 denotes a B pin provided on a large gear 57 fixed to the cam shaft 48. When the closing trigger 58 is at the standby position, the leading end of the closing trigger 58 contacts the B pin 63 and 57 is prevented from rotating.

Reference numeral 71 denotes a bearing provided on the output lever 50 at a position away from the main shaft 49 and parallel to the main shaft 49.
One end of the double insertion prevention pin 70 is inserted into the bearing 71 so that it can rotate freely.

As clearly shown in the side view of FIG. 2, the double insertion prevention pin 70 has two L-shaped portions including a bent portion which is almost 90 °, but both ends are mutually opposite. It is bent to be almost parallel.

Reference numeral 72 denotes an oval hole (guide hole) provided on the frame body 100, and one end of the double insertion prevention pin 70 penetrates the oval hole 72 in a slidable manner. The direction of movement of the double throw prevention pin 70 is guided by the oblong hole (guide hole) 72.

As shown in FIG. 3, the oblong hole 72 has a long axis direction which is a tangent to a circular motion about the axis 55 of the closing trigger 58 (a portion in contact with the closing trigger 58 moves). Direction), and the position thereof is provided such that the double insertion prevention pin 70 penetrating the oval hole 72 hits the end of the insertion trigger 58. ing.

When the main contact 1 is open as shown in FIG. 3, the output lever 50 is in the first angular position 101.
It is in. At this time, since the bearing 71 is located at the upper left of the main shaft 49, the tip portion of the double insertion prevention pin 70 has moved below the oblong hole 72. Therefore, since there is a sufficient gap between the closing trigger 58 and the double closing prevention pin 70, the double closing prevention pin 70 does not restrict the movement of the closing trigger 58.

When a closing command signal (not shown) is input, the closing electromagnet 60 operates and the plunger 68 causes the closing trigger 5 to move.
Press 8 down. This causes the B pin 63 and the pushed down trigger 581 to be separated from each other, and the large gear 57 is rotated by being driven by a driving means such as an electric motor (not shown). The cam 69 integrated at 48 rotates, the cam 69 opens the output lever 50, and the position is changed from the first angular position 101 to
Move to a second angular position 102. As a result, the main contact 1 is closed to be in the state shown in FIG.

Of course, when the output lever 50 moves from the first angular position 101 to the second angular position 102, the bearing 71 of the double closing prevention pin 70 moves,
Since the double insertion prevention pin 70 also moves from the position shown in FIG. 3 to the position shown in FIG. 4, regardless of whether the plunger 68 is hanging down, the insertion trigger 58 is set to the double insertion prevention pin 7.
It is pushed upward by 0 and returns from the position shown at 581 to the position shown at 58.

Next, when the main contact 1 is closed as shown in FIG. 4, the output lever 50 is at the second angular position 102. At this time, since the bearing 71 is at the upper right of the main shaft 49, the tip portion of the double insertion prevention pin 70 has moved to the upper side of the oblong hole 72. The closing trigger 58 is a double closing prevention pin 7
Since it is pushed by 0, it cannot move freely.

When a closing command signal (not shown) enters this state, the closing electromagnet 60 operates and the plunger 6 moves.
8 attempts to depress the closing trigger 58. However, since the double closing prevention pin 70 prevents the closing trigger 58 from moving, the closing trigger 58 does not move and the cam shaft 48 does not rotate. Therefore, the double injection operation was prevented.

FIGS. 1 to 4 show an example in which the position of the bearing 71 is provided near the upper part of the main shaft 49 as viewed in the drawing, but is not limited to this vicinity. Embodiment 2 FIG. Although the oval hole 72 is provided on the frame 100, it may be provided on the closing trigger 58.
FIGS. 5 and 6 show such an example. In the drawings, reference numeral 72A denotes an oval hole provided on the closing trigger 58. The oval hole 72A has an arc shape centered on the rotation axis 55 of the closing trigger.

FIG. 5 shows an example in which the bearing 71 is on the left side of the main shaft 49. The position of the bearing 71 is such that the extension line of the double closing prevention pin 70 is always the center position of the bearing 55 of the closing trigger 58. It is needless to say that the double closing prevention pin 70 cannot smoothly push back the closing trigger 58 unless it is located at the further left side. The operation of the configuration of FIGS. 5 and 6 is the same as that of FIGS.

[0035]

As described above, since the double throw prevention pin is obtained by simply bending a steel bar and does not require a rotary fulcrum, the structure is simple and the assembly is easy.

Further, since the double closing prevention pin of the double closing prevention device according to the present invention has a spring property, when the output lever comes to the second position and the double closing prevention pin presses the closing trigger, Since the dimensional error can be absorbed by appropriately bending, there is a feature that precision in design and assembly is not required strictly.

[Brief description of the drawings]

FIG. 1 is an exploded configuration diagram of a circuit breaker double closing prevention device according to Embodiment 1 of the present invention.

FIG. 2 is a side sectional view of FIG.

FIG. 3 is a front view of a main part in an opened state of FIG. 1;

FIG. 4 is a front view of a main part in a closed state of FIG. 1;

FIG. 5 is a front view of a main part in an opened state of the circuit breaker double closing prevention device according to Embodiment 2 of the present invention.

FIG. 6 is a front view of a main part in a closed state of FIG. 5;

FIG. 7 is an exploded configuration diagram of a conventional circuit breaker double closing prevention device.

8 is an explanatory view of the angular position of the output lever of FIG. 7;

[Explanation of symbols]

 Reference Signs List 1 main contact 48 camshaft 49 main shaft 50 output lever 51 trip latch 55 trigger shaft 57 large gear 58 closing trigger 60 closing electromagnet 61 tripping spring 62 closing spring 63 B pin 65 return spring 67 output pin 68 plunger 69 cam 70 two Heavy insertion prevention pin 71 Bearing 72 Elliptical hole 72A Arc-shaped elliptical hole 99 Explanation auxiliary line 100 Frame 101 First angular position 102 Second angular position

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01H 33/28-33/59

Claims (4)

(57) [Claims] 1. A main contact provided on a frame of a circuit breaker for opening and closing in response to a closing command signal, being in a standby position when there is no closing command signal, and driven to an operating position when there is the closing command signal. A closing trigger which is controlled by the closing trigger when the closing trigger is at the standby position and is driven by a drive means when the closing trigger is at the operating position; and a rotation of the cam corresponding to an open state of the main contact. An output lever driven from the first angular position to a second angular position corresponding to the closed state, and connected to the main contact; rotatably supported by a bearing provided on the output lever; A double closing prevention pin, guiding the double closing prevention pin to press the closing trigger to the standby position when the output lever is at the second angular position, and Serial breaker of the double-up prevention device characterized by having a guide hole for guiding and away the double-up prevention pin from the closing trigger when in the first angular position. 2. The double closing prevention pin supported by a bearing is
An L-shaped portion including at least two bent portions, and slidably penetrates a guide hole provided in the frame body on a side where the bearing is not located, than the bent portion. 2. The double closing prevention device for a circuit breaker according to 1. 3. The double closing prevention of a circuit breaker according to claim 2, wherein the guide hole is an oblong hole long in the movement direction of the closing trigger at a portion where the closing trigger and the double closing prevention pin contact. apparatus. 4. The double closing prevention device for a circuit breaker according to claim 2, wherein an arc-shaped oval hole provided on the closing trigger is used instead of the guide hole provided on the frame body.