JP3545929B2 - Circuit breaker energy storage device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an energy storage device for a circuit breaker that opens and closes a circuit breaker with the energy of an energy storage spring that is either electrically or manually charged, and in particular, stores energy even when excessive force is applied by manual operation. The present invention relates to an energy storage device for a circuit breaker in which an engagement mechanism between a shaft and a ratchet is not broken.
[0002]
[Prior art]
The energy storage device of a circuit breaker is a device capable of rapidly supplying mechanical energy required for opening and closing the circuit breaker at any time by a command. Among the energy storage devices of the circuit breaker, a device using a ratchet wheel is advantageous when a relatively large driving energy is to be supplied with a small force. The ratchet is rotated by a reciprocating motion of a driving pawl that engages with teeth formed on the outer periphery thereof. When the ratchet wheel reaches the state where the energy storage spring has been charged to its dead center, the circuit breaker enters a standby state, and the energy storage device is locked, so that the electric motor for driving the driving claw also stops. ing.
[0003]
Figure 4 is a side view showing a configuration of a conventional circuit breaker prestressing device, FIG 5 is a front view of the left from Y-Y cross section of FIG. 4 , one end of a crank arm 4 is fixed to the right end of the energy storage shaft 1, and a connecting rod 6 is connected to the other end of the crank arm 4 via a pin 4A. An energy storage spring 8 for closing the circuit breaker is attached to the connecting rod 6. A roller 36 is rotatably attached to the upper end of a lever 35 fixed to the energy storage shaft 1, and a lock lever 37 is in contact with the roller 36. Although the configuration of the leftmost end of the energy storage shaft 1 is not shown, a mechanical transmission mechanism for transmitting the rotational movement of the energy storage shaft 1 to the opening / closing shaft 44 is provided. The open / close shaft 44 is connected to a circuit breaker (not shown), and the circuit breaker is opened and closed. FIG. 4 shows a state in which the maximum energy is stored in the energy storage spring 8, and the locking lever 37 locks the rotation of the energy storage shaft 1 in this state.
[0004]
In FIG. 5 , teeth 15 are formed on the entire outer circumference of the ratchet wheel 11 except for the missing portion 16. The ratchet wheel 11 is connected to the energy storage shaft 1 via an engagement mechanism 60. Although the detailed configuration of the engagement mechanism 60 will be described later, the engagement mechanism 60 includes a projecting key 14 protruding from the energy storage shaft 1 and a pressing pin 29 fixed to the ratchet wheel 11 side. Are adapted to intermittently rotate the energy storage shaft 1. Further, front and back two levers 18 are provided so as to sandwich the ratchet wheel 11 from both sides. The levers 18 are rotatable around the energy storage shaft 1 and a link shaft 19 penetrates the left end. . A drive rod 21 is connected to the link shaft 19, and the drive rod 21 reciprocates via an eccentric wheel 42 by an electric motor 22. A drive claw 20 and an auxiliary claw 30 are rotatably mounted on the link shaft 19. Each of the driving claw 20 and the auxiliary claw 30 is formed so that the claw portions 20A and 30A at its ends can be fitted to the teeth 15 of the ratchet wheel 11, and is constantly biased in the direction of the teeth 15 by a spring (not shown). Have been.
[0005]
In FIG. 5 , two front and back support levers 31 are provided so as to sandwich the ratchet wheel 11 from both sides. The support levers 31 are rotatable about the energy storage shaft 1 and two upper and lower link shafts. 33 penetrates. A support claw 32 is rotatably mounted on each of the link shafts 33, and a claw portion 32A at an end thereof is formed so as to be fitted to the tooth 15 of the ratchet wheel 11, and the direction of the tooth 15 is adjusted by a spring (not shown). Is always energized. The support claw 32 is for preventing the ratchet wheel 11 from rotating in the clockwise direction, and serves as a substitute for the driving pawl 20 when the ratchet wheel 11 is manually operated. That is, the pipe 45 is fixed to the upper part of the support lever 31. By inserting a manual handle (not shown) into the pipe 45, the support lever 31 can be manually reciprocated, and the ratchet wheel 11 can be driven manually with the support claw 32 in place of the drive claw 20. An opening / closing shaft 44 for opening / closing a circuit breaker (not shown) is in contact with an end surface of a notch 43 formed in the support lever 31. With this configuration, the opening / closing shaft 44 serves as a stopper for the support lever 31, and the rotation of the support lever 31 in the clockwise direction from the state shown in FIG. 5 is restricted. The support lever 31 is constantly urged clockwise by the coil spring 57 below the support lever 31.
[0006]
Figure 6 is a partial front view showing the enlarged engagement mechanism 60 of FIG. 5, FIG. 7 is an A-A sectional view of FIG. An engagement mechanism 60 between the ratchet wheel 11 and the energy storage shaft 1 includes the protruding key 14 and the pressing pin 29, and is disposed inside an engaging hole 70 (FIG. 7 ) formed inside the ratchet wheel 11. . Further, the holding plate 5 is provided so as to sandwich the ratchet wheel 11 from both sides, and is fixed to the ratchet wheel 11 via a rivet 50. As shown in FIG. 6, a notch 5A is formed in the inner wall of the hole 1A through which the holding plate 5 penetrates, and the pressing pin 29 is fitted into the notch 5A. As shown in FIG. 7 , the pressing pin 29 penetrates the holding plate 5 and is clamped from both ends by washers 51. However, the washer 51 is fixed so as not to move in the axial direction of the energy storage shaft 1.
[0007]
FIGS. 8A and 8B are views showing a configuration in which the protruding key 14 of FIG. 6 is fixed to the energy storage shaft 1, wherein FIG. 8A is a plan view of a main part, and FIG. 8B is a plan view of FIG. It is sectional drawing. The protruding portion 14A and the protruding key 14 serving as a root portion 14B are formed from a square bar, and the protruding portion 14A protrudes upward from the outer diameter surface of the energy storage shaft 1, and the root portion 14B is fitted to the energy storage shaft 1. The projecting key 14 is fixed to the energy storage shaft 1 by being swaged and embedded in the mating groove 63A.
[0008]
Figure 9 is a principle diagram for explaining the operation of the circuit breaker of the prestressing device of FIG. The energy storage shaft 1 shown in FIG. 9 is a view taken in the direction of the arrow Z in FIG. 4 , and the roller 36 rotates around the end of the lever 35 fixed to the energy storage shaft 1 as described above. The roller 36 is movably attached, and the end face 38 of the lock lever 37 is in contact with the roller 36. The lock lever 37 is freely rotatable about the fixing pin 37A. The upper end of the locking lever 37 is linked to the electromagnet device 40. When the electromagnet device 40 is excited, the upper end of the locking lever 37 is sucked in the direction of arrow 41, and the locking lever 37 pushes the fixing pin 37A. It rotates clockwise around the center.
[0009]
In FIG. 9 , a switch 39 is interposed in series with a power supply 64 in the excitation circuit 22A of the electric motor 22 described above. Is adapted to interlock and the switch 39 and the lever 35, in contact with that state as the lock lever 37 and the roller 36 Togazu 9, switch 39 is open. When the lock lever 37 is rotated clockwise, the roller 36 is disengaged from the lock lever 37 and moves upward, and the switch 39 is closed.
[0010]
Further, in FIG. 9 , when the energy storage shaft 1 rotates clockwise, the main contacts 9B of the circuit breaker 9 are closed via the mechanical transmission mechanism 9A. Next, the operation of the energy storage device of the circuit breaker described above will be described. Figure 4 is a diagram of a state in which the energizing spring 8 is fully prestressed, in a position the crank arm 4 is beyond the slightly dead center of the upper, in this state, as the energy storing shaft 1 of FIG. 9 Has been locked. In FIG. 9 , when the electromagnet device 40 is excited, the upper part of the lock lever 37 is pulled in the direction of the arrow 41, and the roller 36 comes off the lock lever 37. As a result, the energy storage shaft 1 rotates about 180 degrees by the release of the energy storage spring 8, and the main contacts 9B of the circuit breaker 9 are closed. At this time, the lever 35 rotates together with the energy storage shaft 1, the switch 39 is closed, and the electric motor 22 starts. At this time, the protruding key 14 in FIG. 5 has moved away from the pressing pin 29 and almost to the upper part of the energy storage shaft 1. Meanwhile, the pressure pin 29 still does not move, in the position in FIG. When the electric motor 22 is started, the driving rod 21 and the lever 1 start reciprocating, and the next energy storing operation is started. However, at this time, the driving pawl 20 does not act on the ratchet wheel 11 because it is located in the missing portion 1 of the tooth 1 of the pawl wheel 11, and instead, the auxiliary pawl 30 acts on the teeth 15 to reciprocate the pawl wheel 11. Try to move it. The auxiliary claw 30 exerts a small driving moment in the clockwise direction and a large driving moment in the counterclockwise direction depending on its shape. However, since the clockwise rotation is prevented by the support claws 32, only the counterclockwise driving moment is effective, and the ratchet wheel 11 rotates counterclockwise. As a result, the driving claw 20 comes into engagement with the teeth 15, and thereafter, the ratchet wheel 11 is rotated counterclockwise by the driving claw 20. The ratchet wheel 11 idles approximately 180 degrees until the pressing pin 29 of the engaging mechanism 60 contacts the protruding key 14. Only after the pressing pin 29 comes into contact with the protruding key 14, the energy storage shaft 1 follows the ratchet wheel 11 and is driven again until the state shown in FIG. 5 is reached. That is, the crank arm 4, connecting rod 6 and energizing spring 8 returns to the state of FIG. Here, the lever 35 is locked by the locking lever 37. At this time, the crank arm 4 slightly exceeds the dead center upward, the driving claw 20 reaches the missing portion 16 of the tooth 15, the switch 39 is opened, and the electric motor 22 stops.
[0011]
As described above, the power storage device of the circuit breaker is configured to manually rotate the ratchet wheel 11 when the electric motor 22, the control power supply, or the like breaks down by inserting a manual handle into the pipe 45 to store the power. The spring 8 can be charged.
[0012]
[Problems to be solved by the invention]
However, the conventional device described above has a problem in that, when the energy storage spring is charged by manual operation, the engagement mechanism between the energy storage shaft and the ratchet may be broken. In other words, even if the accumulating spring has been completely charged by manual operation and the circuit breaker is in the standby standby state, if the user continues to perform manual operation by mistake, the accumulating spring is caulked into the fitting groove of the accumulating shaft. There is a possibility that the protruding key that has been disengaged from the fitting groove loses the function as the engagement mechanism.
[0013]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a power storage device of a circuit breaker in which an engagement mechanism between a power storage shaft and a ratchet wheel is not broken even when an excessive force is excessively applied in a manual operation.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, an energy storage spring that opens and closes a circuit breaker, an energy storage shaft that rotates to accumulate the energy storage spring, and engages the energy storage shaft A ratchet wheel that rotates through a mechanism, and a driving claw that rotates the ratchet wheel either electrically or manually, and the engagement mechanism is configured such that the urging shaft and the ratchet wheel when the urging spring is released. In the energy storage device of the circuit breaker for disengaging the energy storage spring and engaging the energy storage shaft with the ratchet wheel during the energy storage of the energy storage spring, the engagement mechanism is provided in a fitting groove formed in the energy storage shaft. The base comprises a protruding key having a protruding portion protruding from the outer diameter surface of the energy accumulating shaft and a pressing pin fixed to the ratchet wheel and capable of contacting the protruding portion of the protruding key. root portion of the projecting key, may in the axial direction of the energy-storing shaft Ru extended longer on both sides than the projecting portions. As a result, the area where the base of the projecting key is caulked by the fitting groove of the energy storage shaft is larger than that of the conventional device, and the force for removing the base from the fitting groove is increased. Therefore, the protruding key is hardly disengaged from the energy storage shaft, so that the engagement mechanism is hardly broken.
[0015]
In energizing for circuit breaker of such a structure, the pressing plate is provided for clamping the ratchet wheel from both sides, the base portion of the long extended the projecting keys on both sides from the protruding part in the axial direction of the prestressing axis, 蓄You may make it interpose between a power shaft and a holding plate. As a result, the base is held down by the holding plate, and the projecting key does not come off the energy storage shaft, so that the engagement mechanism is never broken.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described based on examples. 1 is a front view of a main part showing an engagement mechanism of an energy storage device of a circuit breaker according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line BB of FIG. In FIG. 1, the engagement mechanism 61 includes a protruding portion 52 </ b> A protruding from the outer diameter surface of the energy storage shaft 1 in the outer diameter direction and is embedded so as to be crimped into the fitting groove 2 of the energy storage shaft 1. The protruding key 52 includes a base portion 52B, and a pressing pin 29 that can contact the protruding portion 52A of the protruding key 52 and is fixed to the ratchet wheel 11 side. The base 52B of the protruding key 5 is formed thicker than the protruding part 52A as shown in FIG. A base 52 of the protruding key 52 is interposed between the holding plate 5 and the energy storage shaft 1.
[0017]
3A and 3B are views showing a configuration in which the protruding key 52 of FIG. 1 is fixed to the energy storage shaft 1. FIG. 3A is a plan view of a main part, and FIG. 3B is an EE diagram of FIG. It is sectional drawing. The root portion 52B is elongated in the axial direction of the energy storage shaft 1 and is caulked in the elongated groove 2. 1 to 3 are the same as the conventional configuration in FIGS. 6 to 8 , and the same parts as those in the conventional art are denoted by the same reference numerals and detailed description thereof will be omitted.
[0018]
Returning to FIG. 2 , since the area where the root 52 </ b> B of the protruding key 52 contacts the fitting groove 2 of the energy storage shaft 1 is larger than before, the force with which the root 52 </ b> B comes out of the fitting groove 2 increases. Therefore, even if an excessive force is applied manually, the protruding key 52 is hardly disengaged from the energy storage shaft 1, so that the engagement mechanism 61 is hardly broken. Further, since the base 52B is pressed by the pressing plate 5 and the projecting key 52 does not come off the energy storage shaft 1, the engaging mechanism 62 is never broken. Thereby, the reliability of the device is improved.
[0022]
【The invention's effect】
According to the present invention, as described above, the engaging mechanism includes a projecting key in which a root portion is caulked into a fitting groove formed in the energy storing shaft and a projecting portion projects from an outer diameter surface of the energy storing shaft. A push pin fixed to the ratchet wheel side that can be brought into contact with the protrusion of the key, and the base of the protrusion key is extended to both sides of the protrusion in the axial direction of the energy storage shaft . Even if the manual operation is mistaken, the engagement mechanism is not easily broken, and the reliability is improved.
[0023]
In the energy storage device of the circuit breaker having such a configuration, a holding plate for holding the ratchet wheel from both sides is provided, and a base portion of the protruding key extended longer on both sides than the protruding portion in the axial direction of the energy storage shaft is charged. By being interposed between the shaft and the holding plate, the engagement mechanism is not broken even if the manual operation is erroneous, and the reliability is further improved.
[Brief description of the drawings]
FIG. 1 is a front view of a main part showing an engagement mechanism of an energy storage device of a circuit breaker according to an embodiment of the present invention. FIG. 2 is a sectional view taken along line BB of FIG. 1. FIG. a view configuration is shown to be fixed to the energized axis, (a) is a main part plan view, (B) is prestressed in the E-E cross-sectional view Figure 4 conventional circuit breaker (a) in FIG. 3 side view showing the configuration of a device [5] of Figure 4 Y-Y FIG . 6 is a front view of the left side of the cross section. FIG . 6 is an enlarged front view of a main part showing the engagement mechanism of FIG . 5; FIG . FIG . 8 is a view showing a configuration in which the projecting key of FIG . 6 is fixed to the energy storage shaft, where (A) is a plan view of a main part, and (B) is a DD of FIG. 11 (A). FIG . 9 is a principle diagram for explaining the operation of the energy storage device of the circuit breaker in FIG . 4 [Description of reference numerals]
1: energy storage shaft, 2: fitting groove, 5: holding plate, 11, 110: ratchet wheel, 29: pressing pin, 52: protruding key, 52A: protruding portion, 52B: base portion, 53: locking claw, 53A: end portion, 55: support pin, 56: locking groove, 61, 62: engagement mechanism, 70, 71: engagement hole

Claims (1)

An energy-storing spring for driving the circuit breaker to open and close, an energy-storing shaft for accumulating the energy-storing spring by rotating, a ratchet for rotating the energy-storing shaft via an engagement mechanism, And a driving claw for rotating either manually or electrically, the engagement mechanism disengages the energy storage shaft and the ratchet wheel when the energy storage spring is released, and operates when the energy storage spring is energized. In an energy storage device of a circuit breaker for engaging an energy storage shaft with a ratchet wheel, the engagement mechanism may be configured such that a root portion is caulked into a fitting groove formed in the energy storage shaft and a protruding portion is provided on the energy storage shaft. A pressing key is provided, which comprises a projecting key protruding from the outer diameter surface, and a pressing pin which can be brought into contact with the projecting portion of the projecting key and is fixed to the ratchet wheel side, and which holds the ratchet wheel from both sides, root portion of the long extended the projecting keys on both sides than the axial projection of the prestressing axis, said energy storing shaft before Energizing for circuit breaker, characterized in that interposed between the pressing plate.

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