JPH09259711A - Double circuit breaker prevention device - Google Patents

Abstract

(57) [Summary] [Problem] There is a problem in that the structure of a mechanical device for double-closing of a circuit breaker is complicated in spite of its secondary function. SOLUTION: A first angular position 101 corresponding to an open state of a main contact 1 to a second angular position 102 corresponding to a closed state.
Provided on the output lever 50 driven to the closing lever 5 when the output lever 50 is in the second angular position 102.
8 has a double closing prevention pin 70 that directly presses 8 to the standby position and does not contact the closing trigger 58 when in the first angular position 101.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art FIG. 7 shows an exploded view of the internal structure of a conventional circuit breaker, which is relevant to the present invention. The figure is partially simplified in order to prevent it from becoming unnecessarily complicated. In the figure, 1 is the main contact of this circuit breaker, 10
0 is the frame of the circuit breaker. An output pin 67 drives the main contact 1. Reference numeral 50 denotes an output lever to which an output pin 67 is connected, which is fixed to a main shaft 49 rotatable with respect to the frame body 100, and which opens the main contact 1 shown in FIG.
8 and the second angular position 102 for inserting the main contact 1 shown in FIG. 8B.

FIG. 7 is a diagram showing a state at the first angular position 101. Note that reference numeral 99 in the figure is an auxiliary line for explaining the horizontal direction. 61 is the frame 100 and the output lever 5
It is a trip spring suspended between the two. 57 is a large gear driven in one direction by the electric motor 2 and the drive pawl 3,
Reference numeral 48 is a cam shaft rotated by the large gear 57.

Reference numeral 69 denotes a cam which rotates together with the cam shaft 48 and kicks the output lever 50 for each rotation. 51 is cam 6
9 is a trip latch for holding the output lever 50 kicked by 9 at the second angular position 102 (main contact 1 is closed). Reference numeral 60 denotes a closing electromagnet, which pulls up the plunger 68 (some types are pushed down) by a closing command signal (not shown). The closing command signal is sent from a push button provided on the board surface of the circuit breaker or another control device.

The plunger 68 pulls up 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 around the trigger shaft 55. When there is no closing command signal, the closing spring 58 is pushed by the return spring 65 and is in the lower standby position. When is entered, it is pulled up by the plunger 68 and moved (rotated) to the upper operating position only when the main contact 1 is in the open state.

Reference numeral 63 designates a large gear 57 fixed to the cam shaft 48.
With the B pin provided above, when the closing trigger 58 is at the standby position, the tip of the closing trigger 58 contacts the B pin 63 to prevent the large gear 57 from rotating. 5 is the spindle 4
9 is a link rod which is connected to 9 and moves together with the output lever 50, and is pushed down when the output lever 50 is in the first angular position 101.

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

Next, the operation will be described. When a power source (not shown) is connected, the gear 2 is driven by the motor 2.
7 rotates counterclockwise to compress the closing spring 62 and stop in the state of storing energy. At this time, the output lever 50 is in the first angular position 101. At this time, the closing trigger 58 has the B pin 6
The rotation of the large gear 57 is blocked by hitting 3.

When a closing command signal (not shown) is input, the closing electromagnet 60 attracts the plunger 68, the closing trigger 58 is pulled up, and the B pin 63 is disengaged. At this time, since the output lever 50 is at the first angular position 101, the link rod 5
Is pulled downward, and the interlock spring 77
It deviates from the shackle 7 and does not block the movement of the shackle 7.

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

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

The other end of the interlock spring 77 is engaged with the latch 7, and the interlock spring 77 is engaged when the main contact 1 is in the closed state (that is, when the lever 50 is in the second angular position 102). Even if the main contact 1 is closed, the so-called double insertion in which the cam 69 idles is prevented because the gold 7 is pushed down and even if the plunger 68 is pulled up by the electromagnet 60, it is blocked. It

In addition to the mechanical mechanism described above, the system for preventing double-charging uses an electrical mechanism that causes the circuit of the electromagnet 60 to be disconnected when the main contact 1 is closed. Has been. Then, as a backup of such an electrical mechanism, a mechanical double injection preventing device is used with a secondary aim.

[0014]

Since the conventional double-breaking mechanical preventive device for a circuit breaker is constructed as described above, its structure is complicated in spite of its secondary function. There was a problem to say that.

In order to solve the above-mentioned problems, the present invention provides a double throw mechanical preventive device whose structure is extremely simplified.

[0016]

In the double closing prevention device for a circuit breaker according to the first aspect of the present invention, the rotation of the cam causes the second angle corresponding to the closed state from the first angular position corresponding to the open state of the main contact. An output lever fixed to an output shaft driven to an angular position and having a main contact connected thereto is provided on the output lever, and the closing trigger is actuated when the output lever is in the second angular position. It has a double closing prevention pin that is pressed to the standby position and does not come into contact with the closing trigger when the output lever is in the first angular position.

A double injection preventing device according to a second aspect of the present invention has an L-shaped portion axially supported by a bearing provided on the output lever in parallel with the output shaft and having at least one bent portion. A double closing prevention pin configured to slidably pass through a fulcrum hole provided in the frame on the side where the bearing is not provided with respect to the bent portion and to come into contact with a closing trigger near the tip end.

The double closing prevention device according to the third aspect of the present invention has an elliptical hole that is long in the moving direction of the closing trigger as a fulcrum hole.

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

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. 1 is a perspective view showing an essential part of a circuit breaker using a double closing prevention device according to Embodiment 1 of the present invention. In the following description of the embodiments, the case where the closing electromagnet is a 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 the main contact of this circuit breaker, and 100 is the frame of the circuit breaker. Reference numeral 67 is an output pin for driving the main contact 1, and the drawing is simplified. 50 is output pin 6
An output lever 7 is connected to the main shaft 49. The output lever 7 is fixed to the main shaft 49 rotatable with respect to the frame 100. The first angular position 101 opens the main contact 1 and the second angular position 102 closes the main contact 1. 1 can be taken, and FIG. 1 shows the state at the second angular position 102.

Reference numeral 99 in each drawing is an explanatory auxiliary line showing the horizontal direction. Reference numeral 61 is a trip spring suspended between the frame 100 and the output lever 50. Reference numeral 69 is a cam fixed to a cam shaft 48 (driven by an electric motor (not shown) or the like and rotating with the cam shaft 48 to open the output lever 50 for each rotation.

Reference numeral 51 designates the output lever 50 which has been moved by the cam 69, at the second angular position (main contact closing position) 1.
It is a trip latch for keeping it at 02. Reference numeral 60 denotes a closing electromagnet, which pushes out the plunger 68 by a closing command signal (not shown) (transmitted from a push button provided on the panel of the circuit breaker or another control device).

58 is pushed by the plunger 68 and the shaft 55
It is a closing trigger that rotates around the center. When there is no closing command signal, it is pushed by the return spring 65 and is in the standby position, but when the closing command signal is input, it is pushed by the plunger 68 and the main contact 1 is opened. As long as it is in the state, it moves (rotates) to the operation position 581 shown in FIG. Reference numeral 63 is a B pin provided on a large gear 57 fixed to the cam shaft 48, and when the closing trigger 58 is at the standby position, the tip of the closing trigger 58 contacts the B pin 63 to cause the large gear to move. It blocks the rotation of 57.

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

The double throw-in prevention pin 70 has two L-shaped portions including a bent portion of approximately 90 °, as clearly shown in the side view of FIG. It is bent so that it is almost parallel.

Reference numeral 72 denotes an elliptical hole (guide hole) provided on the frame 100, and one end of the double insertion preventing pin 70 is slidably passed through the elliptic hole 72. The elliptical hole (guide hole) 72 guides the double throw-in prevention pin 70 in the direction of its movement.

As shown in FIG. 3, the elliptical hole 72 has its major axis direction in the direction of a tangent line of a circular movement centering on the shaft 55 of the closing trigger 58 (the portion in contact with the closing trigger 58 moves). Direction), and the position is such that the double closing prevention pin 70 penetrating the oval hole 72 hits the end portion of the closing trigger 58. ing.

Then, as shown in FIG. 3, when the main contact 1 is in the open state, the output lever 50 moves to the first angular position 101.
It is in. At this time, since the bearing 71 is located on the upper left of the main shaft 49, the tip portion of the double insertion preventing pin 70 is moved to the lower side of the oval 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 operate.
Push 8 down. By this (indicated by 581 in FIG. 3), the B pin 63 and the closing trigger 581 pushed down are 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 by 48 rotates, the cam 69 displaces the output lever 50, and its position is changed from the first angular position 101 to
Move to the second angular position 102. As a result, the main contact 1 is closed and the state shown in FIG. 4 is obtained.

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,
The double closing prevention pin 70 also moves from the position of FIG. 3 to the position of FIG. 4, so that the closing trigger 58 acts on the double closing prevention pin 7 regardless of whether the plunger 68 hangs down.
It is pushed back up by 0 and returns from the position shown at 581 to the position shown at 58.

Next, when the main contact 1 is in the closed state as shown in FIG. 4, the output lever 50 is in the second angular position 102. At this time, since the bearing 71 is located on the upper right of the main shaft 49, the tip portion of the double throw-in prevention pin 70 moves to the upper part of the oval hole 72. The closing trigger 58 is the double closing prevention pin 7.
It is pushed by 0 and cannot move freely.

When a closing command signal (not shown) enters this position, the closing electromagnet 60 operates and the plunger 6 moves.
8 tries to push down 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 throwing operation was prevented.

Although FIGS. 1 to 4 show an example in which the bearing 71 is provided near the upper portion of the main shaft 49 as shown in the drawings, the position is not limited to this. Embodiment 2 FIG. Although the elliptical hole 72 is provided on the frame 100, it may be provided on the closing trigger 58.
5 and 6 show such an example, and 72A in the drawings shows an oval hole provided on the closing trigger 58. The oval hole 72A has an arc shape centered on the rotation shaft 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, but the position of the bearing 71 is such that the extension line of the double closing prevention pin 70 is always at the center position of the bearing 55 of the closing trigger 58. Needless to say, the double closing prevention pin 70 cannot smoothly push back the closing trigger 58 unless the position is on the left side. The operations of the configurations of FIGS. 5 and 6 are the same as those of FIGS. 1 to 4, and thus detailed description thereof will be omitted.

[0035]

Since the double throw-in prevention pin is formed by only bending a steel bar and does not require a rotary fulcrum, it has the effects of a simple structure and easy assembly.

Furthermore, 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 pushes the closing trigger, Since it can absorb a dimensional error by bending appropriately, it is characterized in that precision in design and assembly is not strictly required.

[Brief description of drawings]

FIG. 1 is an exploded configuration diagram of a circuit breaker double closing prevention device according to a first embodiment 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 open state of FIG.

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

FIG. 5 is a front view of the essential parts of the double break prevention device for a circuit breaker according to Embodiment 2 of the present invention in an open state.

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

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

8 is an explanatory diagram of the angular position of the output lever of FIG.

[Explanation of symbols]

 1 Main Contact 48 Camshaft 49 Mainshaft 50 Output Lever 51 Tripping 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 input 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

Claims (4)

[Claims] 1. A main contact provided on a frame of a circuit breaker to open / close in response to a closing command signal, and is driven to a standby position when the closing command signal is absent and to an operating position when the closing command signal is present. A closing trigger, a cam driven by the driving means when the closing trigger is in the standby position and the rotation is restricted by the closing trigger, and the operating position corresponds to the open state of the main contact. An output lever driven from a first angular position to a second angular position corresponding to the closed state and connected to the main contact, and rotatably supported by a bearing provided on the output lever. A double closing prevention pin, when the output lever is in the second angular position, the double closing prevention pin is guided to press the closing trigger to the standby position, and the output lever is 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 injection prevention pin pivotally supported by the bearing is 1
It has an L-shaped portion including bent portions at one or more places, and slidably penetrates a guide hole provided in the frame body on the side where the bearing is not present than the bent portion. 2. The circuit breaker double closing prevention device according to 1. 3. The double closing prevention of the circuit breaker according to claim 2, wherein the guide hole is an elliptical hole which is long in a movement direction of the closing trigger at a portion where the closing trigger and the double closing prevention pin come into contact with each other. apparatus. 4. The double closing prevention device for a circuit breaker according to claim 2, wherein an arc-shaped elliptical hole formed in a closing trigger is used instead of the guide hole formed in the frame.