JP2000133097A - Breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use all the stored energy of a closing spring for closing of a breaking part. SOLUTION: One end of a rod 40 is attached to an eccentric position of a rotor 31 rotated by a motor 33, while the rod 40 rotates a closing cam 35 so that the energy is stored in a closing spring 38. The released energy from the closing spring 38 rotates a main lever 29 counterclockwise through rollers 52, 54 so that a breaker is closed and energy is stored in a breaking spring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker and an improved operation mechanism.

[0002]

2. Description of the Related Art Some circuit breakers have a configuration in which closing is performed at a high speed by releasing a spring after storing a spring. As such a circuit breaker, there is one disclosed in Japanese Patent Application Laid-Open No. 8-293231.

FIG. 5 shows a part of an operation mechanism in a circuit breaker. The drive shaft 1 is fixed to a member (not shown),
The drive shaft 1 is provided with a boss 1a rotatably.
The input cam 2a, the trip lever 3, the input cam 2b, the spring guide 4, and the energy storage cam 10 are inserted through the boss 1a, and the drive shaft 1 is inserted into the operation shaft 5. A pin 6, one end of which is fixed to the input cam 2 a, is inserted through the elongated holes 7 and 8, and the other end of the pin 6 is connected to one end of an input spring 9 surrounding the spring guide 4.

A power storage cam 10 is fixed to the operation shaft 5, and a closing spring 9 is attached to a pin 10 a fixed to the power storage cam 10.
Are connected to each other.

A drive lever 12 is rotatably provided on the trip lever 3 via a pin 11, and a roller 13 is provided on the drive lever 12. Reference numeral 14 denotes a closing latch, which is urged counterclockwise to the outer peripheral surfaces of the closing cams 2a and 2b to restrain the closing cams 2a and 2b from rotating clockwise. A trip latch 15 is urged counterclockwise by the outer peripheral surface of the trip lever 3 to restrain the trip lever 3 from rotating clockwise. Reference numeral 16 denotes an energy-storing latch, which is urged clockwise to the outer peripheral surface of the energy-storing cam 10 to restrain the energy-storing cam 10 from rotating counterclockwise.

Next, the operation of opening and closing a not-shown opening / closing section using the operation mechanism will be described. 6 shows a state in which the opening / closing section is open and the closing spring is released, FIG. 7 shows a state in which the closing spring is stored with the opening / closing section open, and FIG. 8 shows a state in which the closing spring is partially released and opened / closed. FIG. 9 shows a state in which the opening portion is closed, the closing spring is completely released, the trip lever is rotated clockwise, and the opening / closing portion is opened again.

As shown in FIG. 6, one end of a reset spring 17 is connected to the pin 6, and the closing cams 2a and 2b and the trip lever 3 are urged counterclockwise.
The stopper 18 restricts the trip lever 3 and the closing cams 2a, 2b from rotating counterclockwise.
At this time, the closing latch 14 causes the closing cam 2a,
2b is restrained from rotating clockwise, and the trip latch 15 does not engage with the trip lever 3 because it contacts the outer edge of the energy storage cam 10. In this state, the roller 13
Does not press the roller 20 to enter the small diameter portions 19, 19 of the input cams 2a, 2b. For this reason, the lever 21 is free, and the urging force of the return spring 22 occupies the position where the insulating rod 23 has turned counterclockwise about the main shaft 24, and the opening / closing part 25 maintains the open state.

Next, when the operating shaft 5 is rotated clockwise so that the pin 10a occupies the position shown in FIG. 7, the closing spring 9 is charged. At this time, the rotational force due to the accumulation of the closing spring 9 is applied to the closing cams 2a and 2b, but the rotation is restricted because the closing latch 14 acts as described above. On the other hand, the trip latch 15 that has not been engaged with the trip lever 3 in the state of FIG. 6 enters the small-diameter portion from the large-diameter portion of the energy storage cam 10, and is turned counterclockwise by the urging force to trip. Engagement with the outer peripheral surface of the lever 3 restricts the clockwise rotation of the trip lever 3.

Next, when the closing latch 14 is rotated clockwise from the charged state of the closing spring 9 in FIG. 7, the closing cams 2a and 2b disengaged from the closing latch 14 cause the releasing force of the closing spring 9 to be released. To rotate clockwise. Therefore, as shown in FIG. 8, the roller 13 is pushed out from the small diameter portions 19, 19 of the input cams 2a, 2b and pushes the roller 20. Therefore, the lever 21 rotates clockwise about the main shaft 24, and the opening / closing section 25 is closed. The input cams 2a, 2 at this time
The amount of rotation of b is the amount until the pin 6 comes into contact with the end of the long hole 7 (the trip lever 3 does not rotate because the trip latch 15 is engaged). It is just before it is done.

When the trip latch 15 is rotated clockwise from the state shown in FIG. 8, the restraint of the trip lever 3 is released, and the trip lever 3 is moved clockwise together with the closing cams 2a and 2b by the amount of the remaining release of the closing spring 9. Then, the trip lever 3 moves away from the stopper 18 as shown in FIG. For this reason, the curved surface portion 12a of the drive lever 12 moves to the left of the roller 20, the main shaft 24 rotates counterclockwise by the urging force of the return spring 22, and the opening / closing portion 25 is opened.

When the trip lever 3 rotates clockwise, the energy-storing latch 16 is rotated counterclockwise around the outer periphery of the trip lever 3, and the energy-storing latch 16 is disengaged from the energy-storing cam 10. . For this reason, the input cams 2a, 2b
The trip lever 3 and the energy storage cam 10 are rotated counterclockwise by the reset spring 17 while maintaining a fixed positional relationship by the closing spring 9, and return to the state of FIG.

[0012]

[0007] However, FIGS.
8 to 9 as well as the closing operation of FIG. 8 to FIG. 9, the energy for closing the spring 9 is used to increase the energy of the closing spring 9. Must.

Further, since an energy-storing latch is required in addition to the closing latch for closing and the trip latch for closing, three latches are required, and the structure becomes complicated.

Therefore, an object of the present invention is to provide a circuit breaker that solves the above problem.

[0015]

According to a first aspect of the present invention, there is provided a circuit breaker including a rotatable rotating plate, a rotating plate interlockingly connected to driving means, and a shaft of the rotating plate. A loading cam having an axis substantially parallel to the center is rotatably provided, and a loading spring is provided between a spring hook pin provided at an eccentric position of the loading cam and a fixed portion, and a rod is engaged with an outer peripheral surface of the loading cam. While the other end of the energy storage rod is rotatably connected to the eccentric position of the rotating plate, the other end of the energy storage rod is provided so as to be able to engage with the rod engaging portion. The closing cam is formed with a latch engaging portion for holding the moved and loaded spring in the charged state, and a closing latch for engaging with the latch engaging portion is provided. One end of the first lever that is rotatable about a rotation axis The other end of the first lever is provided with a first roller pressed against the large-diameter portion, and a second lever is provided rotatably around the axis of the first roller, and is fixed to the operation shaft. A second roller that presses the tip of the main lever to open and close the blocking unit and closes the blocking unit is provided on the second lever, and the urging force of the blocking spring provided on the blocking unit is applied to the second lever. A trip latch for restraining rotation is provided.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the circuit breaker according to the present invention will be described below.

The circuit breaker according to the present invention comprises an operating mechanism 27 shown in FIG. 1 and a breaking unit (not shown). Then, as shown in FIG.
When the main lever 29 is turned counterclockwise, the shut-off portion is closed, and when the main lever 29 is turned clockwise, the shut-off portion is shut off. In the closed state, a blocking spring (not shown) is charged, and in the closed state, an urging force for rotating the main lever 29 counterclockwise always acts.

The structure of the operation mechanism 27 will be described below. A rotating plate 31 is provided on the mounting plate 30 so as to be rotatable.
A motor 33 as a driving means is linked to the rotating plate 31 via a speed reducer 32. A limit switch 34 is attached to the mounting plate 30, and a small diameter portion is provided on the rotating plate 31 so that the switch of the motor 33 is turned on when the closing spring 38 described later is charged and turned off in other cases. 31a and a large diameter portion 31b are formed.

Below the rotary plate 31, a loading cam 35 having an axis parallel to the axis of the rotary plate 31 is rotatable via a shaft 44 provided between the mounting plate 30 and the auxiliary plate 43. Is provided. The input cam 35 is formed with a large-diameter portion 35c for pressing a roller 52 described below downward. Input cam 3
A spring hook pin 36 is fixed to the eccentric position of 5, and a closing spring 38 is hooked between the spring hook pin 37 fixed to the upper part of the mounting plate 30 and the spring hook pin 36. A rod engaging portion 35a is formed on the input cam 35, and the other end of a pair of rods 40 that pinch a pin 39 engaging with the rod engaging portion 35a at one end is located at an eccentric position of the rotating body 31.
It is rotatably connected via c. Reference numeral 41 denotes a separating pin.

The insertion cam 35 is formed with an arc-shaped long hole 35b so as to be rotatable by the amount of reciprocation by the accumulation and release of the injection spring 38, and is inserted into the long hole 35b. A pin 42 is fixed between the mounting plate 30 and the auxiliary plate 43. In order to restrain the rotation of the closing cam 35 when the closing spring 38 is charged, a latch engaging portion 35 d is formed on the outer peripheral surface of the closing cam 35, while the mounting plate 30 and the auxiliary plate 43 are formed.
And a closing latch 45 is provided rotatably between them, and the closing latch 45 is formed with a substantially semicircular cutout portion 45a. At the end of the closing latch 45, a projecting portion 45b projecting in a direction perpendicular to the closing latch 45 is formed.
Is mounted on the auxiliary plate 43. Further, a spring 47 for urging the protruding portion 45b in a direction opposite to the direction pressed by the input electromagnet 46 is provided.

Below the input cam 35, a tripping latch 48, which also serves as a rotation axis, is rotatably provided between the mounting plate 30 and the auxiliary plate 43. One end of a pair of first levers 49 is rotatably provided on the release latch 48, and the other end of the pair of first levers 49 and the upper end of a pair of second levers 50 are rotatable via pins 51. Is joined to. A first roller 52 is provided at the center of the pin 51. In the vicinity of the first roller 52 in the pair of second levers 50, a second roller 54 for pressing the left end of the main lever 29 is provided via a pin 53. Reference numeral 55 denotes a spring for urging the pair of first levers 49 toward the closing cam 35, and reference numeral 56 denotes a pair of second levers 50 that are rotatable around the pins 51 and is directed rightward in FIG. This is a spring that urges. In order to limit the rotation range of the pair of second levers 50 with respect to the pair of first levers 49, the pair of first levers 49 are each formed with an arc-shaped long hole 49a. A pin 50a is connected between the pins, and both ends of the pin 50a are loosely fitted in the long holes 49a.

As described above, since the upward biasing force is applied to the left end of the main lever 29 by the biasing force of the cut-off spring (not shown), the pair of second levers 50 tends to rotate clockwise about the pin 53. An engagement portion 50b is formed on the outer peripheral surface of the second lever 50, and the tripping latch 48 has a substantially semicircular notch near the middle portion in the longitudinal direction so that the second lever 50 can be restrained or released. A portion 48a is formed, and the release latch 4 is used to release the second lever 50.
A projection 48b is formed at an end of the projection 8 in a direction perpendicular to the tripping latch 48. Then, FIG.
A tripping electromagnet 57 for turning the latch 48 in the middle clockwise direction and a spring 5 for turning in the counterclockwise direction
8 are provided.

Next, the operation of the circuit breaker will be described. FIG.
The closing cam 35 rotates clockwise by the release of the closing spring 38, the large diameter portion 35c of the closing cam 35 presses the roller 52 downward, and the roller 54 presses the left end of the main lever 29 downward. In this state, the operation shaft 28 is rotated counterclockwise to enter a blocking unit (not shown). At this time, a biasing force indicated by a broken line arrow in FIG. 2 is constantly applied to a blocking spring (not shown) in a direction for blocking the blocking portion, and the release latch 48 is engaged with the engaging portion 50b of the second lever 50. To keep the input state.

When the closing electromagnet 57 is excited to release the latch 48 from the engaging portion 50b from the state shown in FIG. 2, the main lever 29 is rotated clockwise by the urging force of a not-shown cut-off spring, and these components are attached. The second lever 50 is rotated clockwise around the pin 51 by the force. For this reason, as shown in FIG. 3, the main lever 29, which can move upward at the left end, rotates clockwise, and a blocking section (not shown) is in a closed state.

When the motor 33 is rotated from the state shown in FIG. 3, the rotating motion is transmitted to the rotating body 31 via the speed reducer 32, and the rotating body 31 rotates counterclockwise. Then, the pin 39 at the tip of the rod 40 is engaged with the rod engaging portion 35a, and the closing cam 35 rotates counterclockwise as shown in FIG. Then, the roller 52 is raised by the urging force of the spring 55 because the large diameter portion 35c of the input cam 35 is rotationally moved, and the roller 54 is urged by the spring 56 because the roller 54 is disengaged upward from the left side of the main lever 29. The two levers 50 rotate counterclockwise about the pin 51, and the state shown in FIG. Then, the tripping latch 48 rotates counterclockwise by the action of the spring 58 and engages with the notch 50b. At this time, the closing latch 45 urged counterclockwise by the spring 47
Is engaged with the latch engagement portion 35d, so that the closing cam 35 does not rotate clockwise.

When the rotating body 31 further rotates counterclockwise from the state of FIG. 4B, the pin 39 at the tip of the rod 40 is moved by the action of the separating pin 41 as shown in FIG. After that, the large diameter portion 31b of the rotating body 31 rotates to the position of the limit switch 34, and the rotation of the motor 33 stops.

When the closing electromagnet 46 is excited from the state shown in FIG. 4C, the closing latch 45 is rotated against the urging force of the spring 47, and the closing latch 45 is disengaged from the latch engaging portion 35d. Then, when the closing spring 38 is released, the closing cam 35 rotates clockwise, and the large-diameter portion 35c of the closing cam 35 presses the roller 52 downward, and is released to the notch 50b as described above. The roller 54 of the second lever 50 whose rotation is restricted by the engagement of the
9, the left end is pressed downward, the shut-off portion (not shown) is closed as described above, and the state returns to the state of FIG.

In this embodiment, the trip latch and the rotation axis of the first lever are shared, but they may be separately provided.

[0029]

As can be seen from the above description, claim 1
According to the circuit breaker according to (1), since the latch for holding the charged state of the closing spring and the closing latch are also used, three latches are not required as in the related art, and two latches are sufficient. Therefore, the structure is simple.

Further, the biasing force of the closing spring does not have to be used as in the prior art in order to use the cut-off spring for the release, and all of the stored energy of the closing spring can be used for closing. The stored energy can be used effectively.

[Brief description of the drawings]

FIG. 1A is a left side view and FIG. 1B is a front view of an operation mechanism according to an embodiment of a circuit breaker according to the present invention.

FIG. 2 is a front view showing a closed state of the operation mechanism of the embodiment of the circuit breaker according to the present invention.

FIG. 3 is a front view showing a tripped state of the operation mechanism of the circuit breaker according to the embodiment of the present invention.

FIGS. 4A and 4B are front views showing an operating mechanism of an embodiment of a circuit breaker according to the present invention, in which FIG. FIG. 3C is a front view showing a state at the time of completion, and FIG.

FIG. 5 is an exploded perspective view of a conventional operation mechanism of a circuit breaker.

FIG. 6 is a front view of a conventional circuit breaker operating mechanism at the time of interruption and before the closing spring is charged.

FIG. 7 is a front view of a conventional breaker operating mechanism at the time of disconnection and in a state where a closing spring is charged.

FIG. 8 is a front view of a state in which a part of a closing spring in a conventional operation mechanism of a circuit breaker is released and closed.

FIG. 9 is a front view showing a state in which the rest of the closing spring in the conventional operation mechanism of the circuit breaker is released and cut off.

[Explanation of symbols]

 28 operating shaft 29 main lever 31 rotating body 33 motor 35 closing cam 35a rod engaging portion 35c large diameter portion 35d latch engaging portion 36 spring pin 38 38 closing spring 40 rod 45 Closing latch 48 ... Release latch 49 ... First lever 50 ... Second lever 52, 54 ... Roller

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yujiro Hirao 2-1-1-17 Osaki, Shinagawa-ku, Tokyo Co., Ltd. Inside Meidensha Co., Ltd. (72) Yukio Yamada 2-1-1, Osaki, Shinagawa-ku, Tokyo Stock Company Inside Shameidensha (72) Inventor Ryoichi Nakanishi Numazu City, Shizuoka Prefecture

Claims (1)

[Claims] A rotatable rotary plate is provided, and the rotary plate is connected to a driving means in an interlocking manner. An input cam having an axis substantially parallel to the axis of the rotary plate is rotatably provided, and the input cam is eccentric. A charging spring is provided between the spring hook pin provided at the position and the fixed portion, and a rod engaging portion is formed on the outer peripheral surface of the charging cam, while one end is rotatably coupled to the eccentric position of the rotating plate. The other end of the rod is provided so as to be able to engage with the rod engaging portion,
The input cam is rotated by the reciprocating movement of the energy storage rod to form a latch engaging portion on the input cam for holding the input spring in an energized state, and an input latch engaged with the latch engaging portion is provided. A large diameter portion having a large outer diameter is formed on the outer peripheral surface of the input cam, one end of the first lever is rotatably supported on the rotation shaft, and the other end of the first lever is pressed against the large diameter portion. The first roller to be provided,
A second roller that is provided with a second lever rotatably about the axis of the first roller and that is fixed to the operation shaft and presses the tip of a main lever for opening and closing the blocking unit to enter the blocking unit. Wherein the release lever is provided on the second lever, and a trip latch for restraining the rotation of the second lever due to the application of the urging force of the blocking spring provided on the blocking portion is provided.