JP2013164919A - Operation mechanism for vacuum circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an operation mechanism for vacuum circuit breaker that has an assembly structure improved so as to make the operation mechanism thin and lightweight as well as reduction in the number of components.SOLUTION: There is provided an operation mechanism for vacuum circuit breaker that is arranged in the front of a circuit breaker body and opens and closes a vacuum valve mounted on the circuit breaker body, the operation mechanism being characterized in that an output lever 4 cooperating with the vacuum valve 13 and a swing type stopper 5 opposed to a draw-unlock latch 6 being connected to each other through a toggle link 7, and the vacuum valve 13 is driven to an opening/closing position through power-accumulating/releasing operation of an operation spring 9 engaging the torque link 7. Only one operation spring 9 is used, and has one end engaged directly with a spring engagement hole 7d bored in one link arm 7b of the toggle link 7 and then tensed with a fixed pin 14 by being led out to by the toggle link 7 so as to avoid contact interference with members such as the stopper 5 and toggle link 7.

Description

  The present invention relates to an assembly structure of an operation mechanism equipped in a vacuum circuit breaker.

First, the structure and operation of an operation mechanism (for example, refer to Patent Document 1) in a conventional vacuum circuit breaker will be described with reference to FIGS.
As disclosed in FIG. 5 of Patent Document 1, this operation mechanism is incorporated in an assembly case of an operation unit provided at the front of an opening / closing unit equipped with a vacuum valve, a main circuit terminal, and the like. The circuit breaker is turned on, opened, and reset by the operation handle provided in front of the.

3 to 6, reference numeral 1 denotes a box-shaped case of an operation unit that also serves as an assembly frame of the operation mechanism. Inside the case 1, an operation mechanism 2 having the following configuration is incorporated.
In other words, the operating mechanism 2 is arranged upward with an operating shaft 3 for connecting an operating handle (not shown), a swinging output lever 4 and a supporting shaft 4a arranged below the case via a supporting shaft 4a as fulcrums. Oscillating stopper 5, tripping latch 6 disposed opposite to the tip claw of the stopper 5, toggle link 7 upper link arm 7 a, lower link for connecting the stopper 5 and the output lever 4. An arm 7b, a case-shaped operation link 8, a stopper 5 and a toggle link 7 having a lower end pivotally supported on the case 1 and an upper connection pin 8a connected to a crank arm 3a of the operation shaft 3 via a lever 8b. A pair of left and right operation springs 9 stretched between the connection pin 8a of the operation link 8 and the arm connection pin 7c of the toggle link 7 sandwiched from both sides, and provided on the output lever 4 As shown in FIG. 6, the output lever 4 opens the vacuum valve incorporated in the opening / closing part of the circuit breaker via the link 11 to open and close the assembly. It is connected to a drive shaft 12 that drives the motor.

  The opening / closing and tripping operation of the operation mechanism having the above-described configuration is described in Patent Document 1, and detailed description is omitted here. However, the operation spring 9 is stored in the applied state in FIG. 6 is held in the illustrated position.

  Here, when an overcurrent flows in the main circuit, the trip latch 6 of the operation mechanism 2 releases the engagement of the stopper 5 in conjunction with the operation of the trip coil. Accordingly, as shown in FIG. 6, the stopper 5 receives the spring force of the operating spring 9 and jumps upward, and the output lever 4 swings clockwise around the support shaft 4a, via the link 11 and the drive shaft 12. Open the vacuum valve. At the same time, the closing latch 10 which receives a spring bias from the rear engages with the roller 4b to lock the output lever 4 in the illustrated position, and holds the vacuum valve in the open position.

  Then, when the operation handle stopped at the “enter” position after the current interruption is turned to the “cut / reset” position in the counterclockwise direction, the toggle link 7 is reversed and the stopper 5 is pulled out and locked to the latch 6. When the operation handle is further turned to the “ON” position from this state, the input latch 10 moves backward and returns to the input state shown in FIG.

  Further, when the operating handle is manually turned from the “entering” position to the “cutting” position in the counterclockwise direction from the input state of FIG. 4, the toggle link 7 is reversed to drive the output lever 4 in the clockwise direction. Similarly, the vacuum valve opens.

  In addition to the handle operation type described above, there is also an electric operation type vacuum circuit breaker.

JP-A-6-196046

  By the way, since a vacuum circuit breaker is generally mounted and used in a panel such as a switchboard, it is desired to make it as small and compact as possible so as to reduce the required occupied space.

  In this respect, in the conventional operation mechanism shown in FIGS. 3 to 5, after the portal-shaped operation link 8 is arranged so as to straddle the outside of the stopper 5 and the toggle link 7 as shown in the figure, the operation link 8 The hook of the operation spring 9 is stretched between the connecting pin 8a penetrating the upper end of the arm and the arm connecting pin 7c connecting the upper link arm 7a and the lower link arm 7b of the toggle link 7. Therefore, the operation spring 9 uses two springs in order to avoid unnecessary contact interference with the stopper 5 and the toggle link 7 accompanying the operation of the operation mechanism, and the bias of the spring load of the operation spring 9. The operation spring 9 is divided into the front and the rear when viewed from the front, and is laid on both sides of the stopper 5 and the toggle link 7.

For this reason, the depth dimension d of the assembly case 1 incorporating the operation mechanism 2 as shown in FIG. 5 is increased, and the overall outer size (depth dimension) of the circuit breaker is increased.
The present invention has been made in view of the above points, and its object is to provide an operation mechanism for a vacuum circuit breaker with an improved assembly structure so that the operation mechanism can be reduced in thickness and weight together with a reduction in the number of parts. There is to do.

In order to achieve the above object, according to the present invention, there is provided an operating mechanism for a vacuum circuit breaker which is disposed at a front portion of a circuit breaker body and opens and closes a vacuum valve mounted on the circuit breaker body. The output lever connected to the oscillating stopper and the swinging stopper disposed opposite to the tripping latch are interconnected via a toggle link, and one end of an operation spring serving as a tension coil spring is engaged with the toggle link. In the operation to drive the vacuum valve to the open / close position by accumulating and releasing the operation spring,
The number of the operation springs is one, and one end of the spring is directly engaged with one of the link arms of the toggle link to be stretched (Claim 1). As a specific aspect of the operation spring, One end thereof is engaged with an engagement hole formed in the link arm of the toggle link and pulled out to the side of the toggle link, and the other end is engaged with the fixing pin and stretched.

  According to the above configuration, the number of operation springs of the operation mechanism incorporated in the box-shaped assembly case is reduced to one, the number of parts is reduced, and unnecessary contact interference with the structural members such as toggle links and stoppers, and the spring load is reduced. The circuit breaker can be driven to the open / closed position by accumulating and releasing the operation spring while avoiding bias.

  In addition, by reducing the number of operating springs to one, the operating mechanism can be made thinner and lighter than the conventional structure.

It is a schematic block diagram of the operating mechanism of the vacuum circuit breaker by the Example of this invention, and is a figure showing the injection | throwing-in state. It is operation | movement explanatory drawing of FIG. 1, Comprising: (a), (b) is a figure showing the opening state and the insertion standby state, respectively. It is a perspective view of a conventional operation mechanism mounted on a vacuum circuit breaker. It is a front view of the state which built the operation mechanism of FIG. 1 in the case of the operation part. FIG. 5 is a side view of FIG. 4. It is a figure showing the opening state of the circuit breaker corresponding to FIG.

  Hereinafter, an embodiment of the present invention will be described based on the example shown in FIG. 1 and FIGS. 2 (a) and 2 (b). In addition, in the figure of an Example, the same code | symbol is attached | subjected to the member corresponding to FIG. 3, and the description is abbreviate | omitted.

  That is, in the operation mechanism of the illustrated embodiment, the number of the operation springs 9 is one, and the hooks at one end thereof are perforated at one link arm of the toggle link 7, for example, the intermediate portion of the lower link arm 7 b. The hook is directly hooked into the joint hole 7d and pulled out to the side of the toggle link 7 (right side in the figure), and the other end hook of the spring is hooked on the fixing pin 14 planted in the assembly case 1 (see FIG. 4). I try to stretch it. Although not shown, in this embodiment, when the operating end of the operating handle is linked to the toggle link 7 and the operating handle is turned from the “cut / reset” position to the “enter” position during the closing operation, the link mechanism is used. Thus, the toggle link 7 is drawn to the left side in the figure.

  1, the vacuum valve 13 is held in the closed position via the output lever 4 by the tension spring load of the operation spring 9 in the closing state of FIG. .

  When the tripping latch 6 is rotated counterclockwise in response to a circuit breaker opening command from this state, the engagement of the stopper 5 with the engaging claw is released as shown in FIG. Accordingly, the stopper 5 receives the spring load of the operation spring 9 and rotates counterclockwise about the support shaft 5a, and at the same time, the output lever 4 rotates clockwise via the toggle link 7 and the vacuum valve 13 is rotated. Is driven to the open position. In accordance with the opening operation, the closing latch 10 is engaged with the roller 4 provided at the tip of the output lever 4 to hold the vacuum valve 13 in the opening position.

  In order to turn on the circuit breaker from the tripped open state of FIG. 2A, the operating handle (not shown) is once turned to the “cut / reset” position, and the operating end of the operating handle is moved to the toggle link 7. Work together. When the operation handle is turned to the “enter” position in this state, the toggle link 7 is pulled to the left as shown in FIG. 2B, the operation spring 9 accumulates energy, and the stopper 5 rotates clockwise. Locked to the trip latch 6. When the closing latch 10 is retracted to the standby position, the output lever 4 swings clockwise in response to the spring load of the operating spring 9 and returns to the closing state shown in FIG.

  According to the above configuration, the number of the operating springs 9 used is one, the hooks at one end thereof are engaged with one link arm of the toggle link 7, and the spring is pulled out to the side of the toggle link 7 to be stretched. As a result, the operation mechanism 2 is simplified by reducing the number of parts as compared with the conventional structure in which two operation springs 9 are divided into front and rear as shown in FIGS. The vacuum circuit breaker can be made compact and compact by reducing the depth dimension of the assembly case 1 incorporating the.

1 Operation mechanism assembly case 2 Operation mechanism 3 Operation shaft 4 Output lever 5 Stopper 6 Trip latch 7 Toggle link 7a Upper link arm 7b Lower link arm 7c Arm connecting pin 7d Spring engagement hole

Claims (2)

An operating mechanism of a vacuum circuit breaker arranged at the front of the circuit breaker body for opening and closing a vacuum valve mounted on the circuit breaker body, wherein the output lever linked to the vacuum valve and a swinging latch disposed opposite to the trip latch The movable stopper is interconnected with a toggle link, and one end of an operation spring that becomes a tension coil spring is engaged with the toggle link, and the vacuum valve is opened and closed by storing and releasing the operation spring. In what is driven to
An operating mechanism of a vacuum circuit breaker characterized in that the number of operating springs is one and one end of the spring is stretched by directly engaging with one link arm of the toggle link.   2. The operation mechanism according to claim 1, wherein one end of the operation spring is engaged with an engagement hole drilled in a link arm of the toggle link and pulled out to the side of the toggle link, and the other end is engaged with the fixing pin. A vacuum circuit breaker operating mechanism characterized by being stopped and stretched.