JP4122616B2 - Breaker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a circuit breaker and is an improved operation mechanism.
[0002]
[Prior art]
Some circuit breakers have a configuration in which the closing spring is charged at a high speed by storing the closing spring and then releasing it. As such a circuit breaker, there is one disclosed in JP-A-8-293231.
[0003]
FIG. 6 shows a part of an operation mechanism in the circuit breaker. The drive shaft 1 is fixed to a member (not shown), and the drive shaft 1 is provided with a boss portion 1a so as to be rotatable. The insertion cam 2 a, the trip lever 3, the insertion cam 2 b, the spring guide 4, and the energy accumulation cam 10 are inserted into the boss portion 1 a, and the drive shaft 1 is inserted into the operation shaft 5. A pin 6 having one end fixed to the closing cam 2 a is inserted into the long hole 7 and the hole 8, and one end of a closing spring 9 surrounding the spring guide 4 is coupled to the other end of the pin 6.
[0004]
An accumulating cam 10 is fixed to the operation shaft 5, and the other end of the closing spring 9 is coupled to a pin 10 a fixed to the accumulating cam 10.
[0005]
The trip lever 3 is provided with a drive lever 12 via a pin 11 so as to be rotatable, and the drive lever 12 is provided with a roller 13. Reference numeral 14 denotes a closing latch, which is biased counterclockwise by the outer peripheral surfaces of the closing cams 2a and 2b and restrains the closing cams 2a and 2b from rotating clockwise. Reference numeral 15 denotes a trip latch, which is urged against the outer peripheral surface of the trip lever 3 counterclockwise to restrain the trip lever 3 from rotating clockwise. Reference numeral 16 denotes an energy storage latch which is urged clockwise on the outer peripheral surface of the energy storage cam 10 to restrain the energy storage cam 10 from rotating counterclockwise.
[0006]
Next, the operation of opening / closing an opening / closing unit (not shown) using such an operation mechanism will be described. 7 shows the state where the opening / closing part is open and the closing spring is released, FIG. 8 shows the state where the opening / closing part is open and the closing spring is stored, FIG. 9 shows that the closing spring partially releases and opens / closes FIG. 10 shows a state in which the closing spring is completely released, the trip lever rotates in the clockwise direction, and the opening / closing portion is opened again.
[0007]
As shown in FIG. 7, one end of a reset spring 17 is coupled to the pin 6, and the closing cams 2a and 2b and further the trip lever 3 are urged counterclockwise. The stopper 18 restrains the trip lever 3 and the closing cams 2a and 2b from rotating counterclockwise. At this time, the closing latch 14 restrains the turning cams 2a and 2b from rotating clockwise, and the trip latch 15 abuts on the outer edge of the accumulating cam 10 and therefore does not engage with the trip lever 3. . In this state, the roller 13 does not press the roller 20 to enter the small diameter portions 19 and 19 of the making cams 2a and 2b. Therefore, the lever 21 is free, occupies a position where the insulating rod 23 is rotated counterclockwise about the main shaft 24 by the urging force of the return spring 22, and the opening / closing portion 25 is kept open.
[0008]
Next, when the operating shaft 5 is rotated clockwise so that the pin 10a occupies the position of FIG. 8, the closing spring 9 is stored. At this time, a rotational force due to the stored spring 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. 7 enters the small-diameter portion from the large-diameter portion of the accumulator cam 10 and therefore rotates counterclockwise by the urging force to trip. Engaging with the outer peripheral surface of the lever 3, the rotation of the trip lever 3 in the clockwise direction is restricted.
[0009]
Next, when the closing latch 14 is rotated clockwise from the stored state of the closing spring 9 in FIG. 8, the closing cams 2 a and 2 b disengaged from the closing latch 14 are rotated clockwise by the releasing force of the closing spring 9. To turn. For this reason, as shown in FIG. 9, the roller 13 is pushed out from the small diameter portions 19 and 19 of the making cams 2a and 2b to push the roller 20. Therefore, the lever 21 rotates clockwise about the main shaft 24, and the opening / closing part 25 is closed. The rotation amount of the closing cams 2a and 2b at this time is an 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), and the closing spring 9 This is before all of the release.
[0010]
When the trip latch 15 is rotated clockwise from the state of FIG. 9, the restraint of the trip lever 3 is released, and the trip lever 3 is rotated clockwise together with the closing cams 2a and 2b by the remaining release force of the closing spring 9. The trip lever 3 moves away from the stopper 18 as shown in FIG. For this reason, the curved surface portion 12 a of the drive lever 12 moves to the left of the roller 20, and the main shaft 24 rotates counterclockwise by the urging force of the return spring 22 to open the opening / closing portion 25.
[0011]
When the trip lever 3 is rotated in the clockwise direction, the energy storage latch 16 is rotated in the counterclockwise direction on the outer periphery of the trip lever 3, and the engagement of the energy storage latch 16 with the energy storage cam 10 is released. For this reason, the closing cams 2a and 2b, the trip lever 3 and the accumulating 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 shown in FIG. To do.
[0012]
[Problems to be solved by the invention]
However, since the releasing energy of the closing spring 9 is used not only for the closing operation of FIGS. 8 to 9 but also for the blocking operation of FIGS. 9 to 10, the energy for storing the closing spring 9 is increased and the energy is stored. The rotation angle of the cam 10 must be increased.
[0013]
Further, in addition to a closing latch for closing and a trip latch for shutting off, an accumulator latch is also required, so three latches are required, and the structure becomes complicated.
[0014]
Then, an object of this invention is to provide the circuit breaker which solved such a subject.
[0015]
[Means for Solving the Problems]
In order to achieve such an object, the circuit breaker according to claim 1 is provided with a rotatable rotating plate, interlockingly connecting the rotating plate to driving means, and having an axis substantially parallel to the axis of the rotating plate. A closing cam is provided rotatably, a closing spring is provided between a spring hook pin provided at an eccentric position of the closing cam and a fixed portion, and a rod engaging portion is formed on the outer peripheral surface of the closing cam. The other end of the accumulator rod having one end rotatably coupled to an eccentric position is provided to be engageable with the rod engaging portion, and the closing cam is rotated by the reciprocating motion of the energy storing rod, and the closing spring is stored. A latch engaging portion for holding in the state is formed on the closing cam, while a closing latch for engaging with the latch engaging portion is provided, and a large diameter portion having a large outer diameter is formed on the outer peripheral surface of the closing cam, One end of the first lever is supported rotatably on the rotation shaft, and the other end of the first lever A first roller that is pressed against the large-diameter portion is provided, a second lever is provided that is pivotable about the axis of the first roller, and a main lever that is fixed to the operating shaft and that opens and closes the blocking portion. A second roller is provided on the second lever to push the tip and insert the blocking part, and a tripping latch is provided to restrain the rotation of the second lever due to the biasing force of the blocking spring provided on the blocking part. A cam for stopping the driving means when the energy accumulation is completed is provided in the closing latch, and a limit switch for engaging the cam and turning the driving means on and off is provided. It is characterized by that.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a circuit breaker according to the present invention will be described.
[0017]
The circuit breaker according to the present invention includes the operation mechanism 27 shown in FIG. 1 and a circuit breaker (not shown). Then, as shown in FIG. 1B, a main lever 29 is fixed to the operation shaft 28. When the main lever 29 is rotated counterclockwise, a blocking portion is inserted, and when the main lever 29 is rotated clockwise, it is blocked. It has come to be. In addition, since a shut-off spring (not shown) is stored in the applied state, a biasing force that rotates the main lever 29 clockwise is always applied.
[0018]
The structure of the operation mechanism 27 will be described below. A rotating plate 31 is rotatably provided on the mounting plate 30, and a tapered portion 31 a is formed on the rotating plate 31. A motor 33 as drive means is linked to the rotary plate 31 via a speed reducer 32.
[0019]
Below the rotating plate 31, a closing cam 35 having an axis parallel to the axis of the rotating plate 31 is rotatably provided via a shaft 44 provided between the mounting plate 30 and the auxiliary plate 43. Yes. The charging cam 35 is formed with a large-diameter portion 35c that presses a roller 52 described later downward. A spring hook pin 36 is fixed to an eccentric position of the closing cam 35, and a closing spring 38 is hung between the spring hook portion 37 formed on the auxiliary plate 43 and the spring hook pin 36. The insertion cam 35 is formed with a pin 35a as a rod engaging portion, and the other end of the rod 40 having a recess 39 engaging with the pin 35a at one end is rotatable to the eccentric position of the rotating body 31 via the pin 31c. Is bound to. A means for regulating the position of the rod 40 is provided. A support shaft 41 is provided above the attachment plate 30 and the auxiliary plate 43, and a substantially L-shaped lever 46 is rotatably supported on the support shaft 41. Pins 46a and 46b are provided at both ends of the lever 46, and a positioning portion 46c for determining the position of the pin 46b is formed in the vicinity of the lower end. Further, in FIG. 1B, a spring 47 for urging the rod 40 counterclockwise is attached to the support shaft 41, and one end thereof is hung on the rod 40 while the other end is hung on the auxiliary plate 43. Yes.
[0020]
An arc-shaped elongated hole 35b is formed in the closing cam 35 in order to define a reciprocating rotation range by storing and releasing the closing spring 38, and a pin 42 inserted into the elongated hole 35b is connected to the mounting plate 30. It is fixed between the auxiliary plate 43. A latch engaging portion 35d is formed on the outer peripheral surface of the closing cam 35 in order to constrain the rotation of the closing cam 35 while the closing spring 38 is energized, and between the mounting plate 30 and the auxiliary plate 43. A closing latch 45 is rotatably provided, and the closing latch 45 is formed with a substantially semicircular cutout 45a. A protruding portion 45 b that protrudes in a direction perpendicular to the axis of the closing latch 45 is formed at the end of the closing latch 45, and a closing electromagnet (not shown) that presses the protruding portion 45 b is attached to the auxiliary plate 43. In addition, a spring (not shown) that biases the protrusion 45b in a direction opposite to the direction in which the closing electromagnet is pressed is provided. As shown in FIGS. 4A and 4B, a limit switch 34 is attached to the mounting plate 30. When the closing spring 38 is stored, the switch of the motor 33 is turned on, and in other cases. A cam 45c is attached to the closing latch 45 so that is turned off.
[0021]
A release latch 48 that also serves as a rotation shaft is rotatably provided between the mounting plate 30 and the auxiliary plate 43 below the charging cam 35. One end of a pair of first levers 49 is rotatably provided in the trip latch 48, and the other end of the pair of first levers 49 and the upper ends of the pair of second levers 50 are freely rotatable via pins 51. Is bound 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. 61 urges the pair of first levers 49 toward the closing cam 35 and also urges the pair of second levers 50 pivotable about the pin 51 upward in FIG. 1B. It is a spring to do. 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 second levers 50 are respectively formed with arc-shaped elongated holes 50 a, while the pair of first levers 49 A pin 49a is coupled therebetween, and both ends of the pin 49a are loosely fitted in the long hole 50a.
[0022]
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 unillustrated cutoff spring, the pair of second levers 50 tries to rotate clockwise around the pin 51. An engaging portion 50b is formed on the outer peripheral surface of the second lever 50, and the trip latch 48 has a substantially semicircular notch in the vicinity of the intermediate portion in the length direction so that the second lever 50 can be restrained or released. A portion 48 a is formed, and a projecting portion 48 b that protrudes in a direction perpendicular to the axis of the tripping latch 48 is formed at the end of the tripping latch 48 to open the second lever 50. A tripping electromagnet (not shown) for rotating the tripping latch 48 in the clockwise direction in FIG. 1B and a spring (not shown) for rotating in the counterclockwise direction are provided.
[0023]
A display plate 56 is rotatably provided on the shaft 55 provided at the lower portion of the auxiliary plate 43, and the display plate 56 displays on the display plate 56 in order to indicate whether the closing spring 38 is in an energized state or a released state. As shown in FIG. 1A, the characters “accumulation” and “release” are described. When the display plate 56 is urged clockwise in FIG. 1B and no external force is applied, the display portion 56 is urged so that the portion with the word “release” is parallel to the side surface of the mounting plate 30. A return spring 57 is provided. In addition, as shown in FIG. 1A, a metal fitting 58 is attached to the side surface of the insertion cam 35, and an insertion for manually rotating the insertion cam 35 by inserting a handle at a position corresponding to the pin 35a. A hole 58a is formed.
[0024]
Next, the operation of such a circuit breaker will be described. In FIG. 2A, when the closing spring 38 is released, the closing cam 35 rotates clockwise, the large-diameter portion 35 c of the closing cam 35 presses the roller 52 downward, and the roller 54 is the left end of the main lever 29. Is pushed downward to rotate the operating shaft 28 counterclockwise and a blocking portion (not shown) is inserted. In this state, the closing spring 38 is released, and the display of “release” on the display board 56 can be seen. At this time, since the urging force indicated by the broken-line arrow in FIG. 2 is constantly applied to the cutoff spring (not shown) in the direction of blocking the cutoff portion, the tripping latch 48 is engaged with the engagement portion 50b of the second lever 50. And keeps the input state.
[0025]
When a closing electromagnet (not shown) is excited from the state of FIG. 2 (a) and pulled off, and the latch 48 is rotated clockwise to remove it from the engaging portion 50b, the main lever 29 is moved clockwise by the biasing force of the cutoff spring (not shown). While rotating, the second lever 50 rotates clockwise around the pin 51 by these urging forces. For this reason, as shown in FIG. 2 (b), the main lever 29, which is allowed to move upward at the left end, rotates in the clockwise direction, and a blocking portion (not shown) is blocked.
[0026]
2A, the closing latch 45 rotates counterclockwise (clockwise in FIGS. 1 and 2) as shown in FIG. 4A, and the limit switch 34 is moved. It closes and the motor 33 begins to rotate. When the motor 33 is rotated from the state of FIG. 2B, the rotational motion is transmitted to the rotating body 31 via the speed reducer 32, and the rotating body 31 rotates counterclockwise. Then, the tapered portion 31a of the rotating body 31 comes into contact with the pin 46a as shown in FIG. 2C and pushes the pin 46a upward as shown in FIG. 3A, so that the lever 46 is centered on the support shaft 41. Rotate clockwise. Thereby, the recessed part 39 of the rod 40 moves to the position which engages with the pin 35a. When the motor 33 further rotates, the concave portion 39 at the tip of the rod 40 is engaged with the pin 35a, and the closing cam 35 rotates counterclockwise, and the closing spring 38 is stored. At this time, since the large-diameter portion 35c of the closing cam 35 rotates counterclockwise, the roller 52 is lifted by the urging force of the spring 61, and the roller 54 is disengaged upward from the left side of the main lever 29. The second lever 50 urged by the rotation of the second lever 50 rotates counterclockwise about the pin 51, and the state shown in FIG. In this state, the spring hook pin 36 presses the display plate 56 against the urging force of the return spring 57, and the word “accumulation” is displayed. Then, the trip latch 48 rotates counterclockwise by the action of a spring (not shown) and engages with the notch 50b. In the stored state of the closing spring 38, the closing latch 45, which is biased counterclockwise by a spring (not shown), is engaged with the latch engaging portion 35d, so that the closing cam 35 does not rotate clockwise. As shown in FIG. 4 (b), the cam 45c rotates clockwise by the turning of the closing latch 45 (in FIG. 3 (b), it rotates counterclockwise). The rotation stops.
[0027]
When the rotating body 31 further rotates counterclockwise from the state of FIG. 3B, the concave portion 39 at the tip of the rod 40 is detached from the pin 35a by the action of the spring 47 as shown in FIG. become. In this manner, the engagement and separation of the recess 39 from the pin 35 a are reliably performed by the action of the lever 46 and the spring 47.
[0028]
When a closing electromagnet (not shown) is excited from the state of FIG. 1, the closing latch 45 is rotated against the biasing force of a spring (not shown), 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 in the clockwise direction, and the large-diameter portion 35c of the closing cam 35 presses the roller 52 downward, and as described above, is pulled out to the notch 50b and latched. The roller 54 of the second lever 50 whose rotation is restricted by engaging 48 presses the left end of the main lever 29 downward, and a blocking portion (not shown) is inserted as described above, as shown in FIG. Return to state.
[0029]
When the motor 33 fails or a power failure occurs, the closing spring 38 can be stored manually. As shown in FIG. 5 (a), the handle 60 is inserted into the insertion hole 58a of the metal fitting 58, and rotated about 90 degrees counterclockwise as shown in FIG. 5 (b).
[0030]
In the present embodiment, the trip latch and the pivot shaft of the first lever are combined, but they may be provided separately.
[0031]
【The invention's effect】
As can be seen from the above description, according to the circuit breaker according to the first aspect, since the latch for holding the energized state of the closing spring and the closing latch are combined, there is no need for three latches as in the prior art. Two latches are enough. Therefore, the structure is simple.
[0032]
In addition, it is not necessary to use the urging force of the closing spring as in the past in order to use a cutoff spring for tripping, and since all of the stored energy of the closing spring can be used for closing, the stored energy of the closing spring Can be used effectively.
[0033]
Further, since the limit switch for turning on and off the driving means is provided by engaging the cam integrated with the closing latch, the structure and operation are simplified.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 relates to an operation mechanism of an embodiment of a circuit breaker according to the present invention, wherein (a) is a left side view and (b) is a front view.
FIG. 2 is an operation explanatory diagram of an operation mechanism of an embodiment of a circuit breaker according to the present invention.
FIG. 3 is an operation explanatory diagram of the operation mechanism of the embodiment of the circuit breaker according to the present invention.
FIG. 4 is an explanatory diagram of a limit switch in the operation mechanism of the embodiment of the circuit breaker according to the present invention.
FIG. 5 is an explanatory diagram for manual energy storage in the operation mechanism of the embodiment of the circuit breaker according to the present invention.
FIG. 6 is an exploded perspective view of a conventional circuit breaker operating mechanism.
FIG. 7 is a front view of a conventional circuit breaker operating mechanism at the time of breaking and before storing a spring.
FIG. 8 is a front view showing a closing spring accumulation state at the time of breaking in the operation mechanism of the conventional breaker.
FIG. 9 is a front view showing a state in which a part of the closing spring in the operating mechanism of the conventional circuit breaker is released after being released.
FIG. 10 is a front view showing a state in which the rest of the closing spring in the operating mechanism of the conventional circuit breaker is released and blocked.
[Explanation of symbols]
28 ... Operation shaft 29 ... Main lever 31 ... Rotating body 33 ... Motor 34 ... Limit switch 35 ... Closing cam 35a ... Pin 35c ... Large diameter portion 35d ... Latch engaging portion 36 ... Spring hook pin 38 ... Closing spring 40 ... Rod 45 ... Latch 45c ... Cam 48 ... Trip latch 49 ... First lever 50 ... Second lever 52, 54 ... Roller

Claims (1)

Provided with a rotatable rotating plate and interlockingly connected to the driving means, a charging cam having an axis substantially parallel to the axis of the rotating plate is rotatably provided, and a spring provided at an eccentric position of the charging cam A closing spring is provided between the hanging pin and the fixed portion, and a rod engaging portion is formed on the outer peripheral surface of the closing cam. On the other hand, the other end of the accumulator rod is rotatably connected to an eccentric position of the rotating plate. A latch engaging portion is provided on the closing cam so as to be engageable with the rod engaging portion, and the closing cam is rotated by the reciprocating motion of the energy storing rod to hold the closing spring in the charged state. A closing latch that engages with the engaging portion is provided, and a large-diameter portion having a large outer diameter is formed on the outer peripheral surface of the closing cam,
One end of the first lever is rotatably supported on the rotation shaft, and a first roller that is pressed against the large diameter portion is provided on the other end of the first lever, and the first roller is rotated around the axis of the first roller. A second lever is provided, and a second roller is provided on the second lever, which is fixed to the operating shaft and presses the tip of the main lever for opening and closing the shut-off portion to insert the shut-off portion. Provided with a tripping latch that restrains the rotation of the second lever due to the biasing force of the shut-off spring,
A cam for stopping the driving means when the energy accumulation is completed is provided in the closing latch, and a limit switch for engaging the cam and turning the driving means on and off is provided. A circuit breaker characterized by that.

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