JP2006331962A - Vacuum breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum breaker with reduction in height, stable switching action of which can be assured by improving arrangement and assembly constructions of its vacuum valve, linkage mechanism and electromagnetic repulsion device. <P>SOLUTION: The vacuum breaker comprises: a truck frame 1; the vacuum valve 3; an operation portion 4 of the vacuum valve 3; and the electromagnetic repulsion device 6, wherein, the vacuum valve 3 and its operation portion 4 are so mounted on the truck frame 1 that they are juxtaposed on it, the electromagnetic repulsion device 6 is added on an axis of an insulation shaft 9 which is connected with a movable shaft 3a of the vacuum valve, and the linkage mechanism 5 consisting of a transformation lever 13, an operation rod 12, a wipe spring 14 and a switching lever 11 connects the insulation shaft with a switching shaft 10 of the operation portion. The vacuum valve is supported by being suspended from an upper frame 15 which is disposed above the truck frame in a posture that the movable shaft is turned downwards, the electromagnetic repulsion device is disposed on an upper surface of the truck frame and then the linkage mechanism which is connected to the insulation shaft is disposed at a low position near the upper surface of the truck frame, and the insulation shaft is disposed inside the truck frame by carrying out setting of an end portion of the insulation shaft inside the truck frame and carrying out wearing of a shorting bar 6b which faces an electromagnet 6a and a clasp 16. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an assembly structure of a vacuum circuit breaker applied to a drawer type high voltage circuit breaker installed in a switchboard.

As is well known, the pull-out type high-pressure vacuum circuit breaker mentioned above has a vacuum valve (current interrupting unit), an operating unit, and a conductive unit mounted on the bogie frame, and is installed in a cradle installed in the switchboard. There is known a high-speed circuit breaker that is configured to be connected to a circuit bus, and in particular, a combination of a vacuum valve and an electromagnetic repulsion device to increase the opening speed at the time of interruption (see, for example, Patent Document 1).
Next, FIG. 3 shows a conventional assembly structure for the vacuum circuit breaker (high-speed circuit breaker). In the figure, reference numeral 1 denotes a carriage frame provided with wheels 2. The carriage frame 1 has an opening / closing drive mechanism for a vacuum valve 3 and a vacuum valve 3 and an operation section 4 having a built-in control circuit thereof, and an opening / closing shaft provided for the operation section 4. A link mechanism 5 and an electromagnetic repulsion device 6 linking the two and the vacuum valve 3 are mounted and installed as follows.

That is, the vacuum valve 3 has an insulator lever 7 on the carriage frame 1 in a vertical orientation in which the movable shaft 3a coupled to the movable contact is pulled up and the fixed shaft 3b coupled to the fixed contact is pulled down. It is fixedly supported via. The operation unit 4 is housed in a sheet metal front frame 8 erected on the carriage frame 1, and an operation panel, an opening / closing operation handle and the like (not shown) are provided on the front surface thereof.
On the other hand, the link mechanism 5 that connects the insulating shaft 9 connected to the movable shaft 3 a of the vacuum valve 3 and extending upward and the drive shaft 10 provided in the operation unit 4 has a drive lever 11 on the drive shaft 10. An operation rod 12 connected via the control rod 12, a seesaw-type conversion lever 13 (13 a is a support shaft of the conversion lever 13) bridged between the operation rod 12 and the insulating shaft 9, and an axis of the operation rod 13. And a wipe spring (compression coil spring) 14 interposed between a connecting pin between the conversion lever 13 and a fixed spring receiving seat below the extension pin 13 and extends backward from the upper end of the front frame 8 described above. The upper frame (made of sheet metal) 15 is accommodated and deployed.

The electromagnetic repulsion device 6 is composed of a combination of an electromagnetic coil 6a and a short-circuit plate 6b opposed to the electromagnetic coil 6a. The electromagnetic coil 6a surrounds the insulating shaft 9 and is fixed to the fixed frame 15, and the short-circuit plate 6b is the electromagnetic coil 6a. A fastener 16 is attached to the insulating shaft 9 in close proximity to the upper side of the short-circuit plate 6a after loosely fitting on the shaft of the insulating shaft 9 facing the upper surface side. Although not shown, the main circuit terminal of the vacuum valve 3 is pulled out to the back via the movable shaft 3a and the fixed shaft 3b, and the main circuit terminal in the panel is connected to the main circuit terminal provided on the cradle side in the switchboard. It is connected to the circuit bus.
The opening / closing operation of the vacuum circuit breaker configured as described above is described in detail in Patent Document 1, and the description thereof is omitted here.
Japanese Patent Laid-Open No. 11-213826 (page 2-3, FIG. 14 to FIG. 16)

By the way, the conventional structure of the vacuum circuit breaker described above has the following problems. 3, the vacuum valve 3 is placed and supported on the carriage frame 1 via the insulator 7, and the electromagnetic repulsion device 6 is connected to the movable shaft 3a of the vacuum valve 3 and extends upward. The insulating shaft 9 is arranged on the axis. For this reason, the height A of the insulator 7 and the component height B of the electromagnetic repulsion device 6 including the clasp 16 are added to increase the overall height H1 of the circuit breaker to be tall. On the other hand, it is desirable that the drawer-type circuit breaker housed in the switchboard be configured with the height of the circuit breaker as low as possible in order to reduce the size of the panel.
Further, the link mechanism 5 that controls the opening and closing operation of the vacuum valve 3 is disposed inside the upper frame 15 that is connected to the upper end portion of the front frame 8 rising upward from the carriage frame 1 in a cantilever manner and extends to the rear. The support shaft 13a serving as the shaft fulcrum of the conversion lever 13 and the electromagnetic coil 6a of the electromagnetic repulsion device 6 are fixedly supported by the upper frame 15.

For this reason, when the front frame 8 and the upper frame 15 are assembled on the carriage frame 3 in the circuit breaker assembly process, if there is any error in the assembly position and assembly posture, the insulation connected to the vacuum valve 3 The position and perpendicularity of the support shaft 13a of the conversion lever 13 and the electromagnetic coil 6a with respect to the shaft 9 cannot be secured. For this reason, detailed assembly adjustment is required in the assembly process, and the work takes time and effort.
Furthermore, if the vacuum circuit breaker is installed and opened and closed, an impact load accompanying the opening and closing operation is applied to the link mechanism 5. In this case, the link mechanism 5 is far from the carriage frame 3 installed on the cradle in the panel. If it is placed on the distant upper frame 15, the position of the center of gravity of the entire assembly structure becomes higher by that amount, and the link mechanism becomes more susceptible to vibrations generated by impact loads. Since it is difficult to secure the product and the reliability of the product is lowered, there is a problem that the frame needs to be more robust than necessary.

  The present invention has been made in view of the above points, and its purpose is to solve the above problems, reduce the overall height of the circuit breaker, and improve the assembly structure so that stable opening / closing operation characteristics can be secured. Is to provide a vessel.

In order to achieve the above object, according to the present invention, an electromagnetic repulsion device is added on the axis of an insulating shaft that is mounted on a carriage frame in parallel with a vacuum valve and an operation unit and is connected to a movable shaft of the vacuum valve. In the vacuum circuit breaker in which the insulating shaft and the opening / closing shaft of the operation unit are connected via a link mechanism including a conversion lever, an operation rod, a wipe spring, and an opening / closing lever.
The vacuum valve is suspended and supported by an upper frame disposed above the carriage frame with the movable shaft facing downward, and an electromagnetic repulsion device is disposed on the upper surface side of the carriage frame, and the vacuum valve is movable. An electromagnetic repulsion device and a link mechanism are connected to an insulating shaft connected to the shaft to constitute an assembly (claim 1).
In the above configuration, the conversion lever connected to the insulating shaft is disposed at a low position close to the upper surface of the carriage frame, and the operation rod is connected to the opening / closing lever disposed above the conversion lever at this position, The wipe spring is configured to be interposed between the connecting pin of the operation rod and the carriage frame.

  Further, the insulating shaft penetrates through the electromagnetic coil of the electromagnetic repulsion device, and the shaft tip portion is drawn into the inside of the carriage frame, and then the shaft tip portion is opposed to the electromagnetic coil and the fastener. Is placed inside the carriage frame (claim 3).

  According to said structure, compared with the conventional assembly structure, the insulator (insulator) which mounts on a trolley | bogie frame and mounts and supports a vacuum valve becomes unnecessary, and the total height of a circuit breaker assembly reduces. In addition, the electromagnetic repulsion device is arranged on the bogie frame, making it easy to assemble and adjust the assembly with the insulated shaft. In addition, a link mechanism including a conversion lever, an open / close shaft, an operating rod, and a wipe spring is added to the bogie frame. By disposing at a close position, the influence of vibration due to the impact load accompanying the opening / closing operation is reduced, and stable opening / closing operation characteristics can be secured.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on the examples shown in FIGS. In addition, in the figure of an Example, the same code | symbol is attached | subjected to the same member corresponding to FIG. 3, and the description is abbreviate | omitted.
That is, in the configuration of the illustrated embodiment, the upper frame 15 is connected to the upper frame 15 via the insulator 7 behind the upper end of the front frame 8 erected on the carriage frame 1, and the upper frame 15 has a vacuum valve. 3 is suspended and supported with the movable shaft 3a facing down and the fixed shaft 3b facing up in the opposite direction to the conventional structure of FIG. Further, the electromagnetic repulsion device 6 is installed on the upper surface side of the carriage frame 1 and its electromagnetic coil 6a is fixed to the carriage frame. The short-circuit plate 6b and the fastener 16 facing the electromagnetic coil 6a are provided inside the carriage frame 1. At this position, it is connected to the movable shaft 3a of the vacuum valve 3 and is attached to the tip of the insulating shaft 9 extending downward. With this configuration, the external height of the vacuum circuit breaker is reduced to H2 (H1 <H1) by an amount corresponding to the height dimension A and B occupied by the parts shown in the conventional structure of FIG.

On the other hand, with respect to the link mechanism 5 that connects the insulating shaft 9 and the opening / closing shaft provided in the operation unit 4, the conversion lever 13 having one end pivotally supported by the support shaft 13a is close to the upper surface of the carriage frame 1. After being disposed at the position, the conversion lever 13 and the open / close lever 11 disposed above the connection lever are connected via the operation rod 12, and the wipe spring 14 is connected to the connection pin 12a of the operation rod 12 connected to the conversion lever. It is inserted between the bogie frame 1. The connecting structure of the operating rod 12 and the converting lever 13 is connected to the converting lever 13 via a connecting pin 12a fitted in a long hole 12b drilled in the shaft end of the operating rod 12, as will be described in detail in FIG. In addition to the coupling, the roller 12c fitted into the coupling pin 12a is pressed against the spring receiving seat 14a of the wipe spring 14 so as to constantly urge the conversion lever 13 with an upward spring force.
According to the above component arrangement and assembly structure, each component constituting the link mechanism 5 is arranged at a low position close to the carriage frame 1, so that vibration caused by an impact load during opening and closing operations compared to the conventional structure of FIG. The effect is greatly reduced, and the circuit breaker switching characteristics are stabilized. Further, since the wipe spring 14 is disposed on the opposite side of the operation rod 12 with the conversion lever 13 interposed therebetween, the operation rod is shortened so that the height position of the opening / closing shaft 10 is close to the cart frame 1 and disposed at a low position. Is possible.

Assembly structure diagram of a drawer type vacuum circuit breaker according to an embodiment of the present invention Enlarged view showing the detailed structure of part P in FIG. Assembly drawing of a conventional pull-out type vacuum circuit breaker

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bogie frame 3 Vacuum valve 3a Movable shaft 4 Operation part 5 Link mechanism 6 Electromagnetic repulsion device 6a Electromagnetic coil 6b Short-circuit plate 7 Insulator 9 Insulating shaft 10 Opening / closing shaft 11 Opening / closing lever 12 Operating rod 13 Conversion lever 14 Wipe spring

Claims (3)

Mount the vacuum valve and the operation unit side by side on the carriage frame, add an electromagnetic repulsion device on the insulation shaft connected to the movable shaft of the vacuum valve, and convert between the insulation shaft and the opening / closing shaft of the operation unit In a vacuum circuit breaker linked via a link mechanism consisting of a lever, operating rod, wipe spring, and open / close lever,
The vacuum valve is suspended and supported by an upper frame disposed above the carriage frame with the movable shaft facing downward, and an electromagnetic repulsion device is disposed on the upper surface side of the carriage frame, and the vacuum valve is movable. A vacuum circuit breaker constructed by assembling an electromagnetic repulsion device and a link mechanism linked to an insulating shaft connected to a shaft. 2. The vacuum circuit breaker according to claim 1, wherein the conversion lever connected to the insulating shaft is arranged at a low position close to the top surface of the carriage frame, and the operation rod is connected to the opening / closing lever disposed above the conversion lever. In addition, a vacuum circuit breaker characterized in that a wipe spring is interposed between the connecting pin of the operation rod and the carriage frame. 2. The vacuum circuit breaker according to claim 1, wherein the insulating shaft passes through the electromagnetic coil of the electromagnetic repulsion device, the shaft tip portion is drawn inward of the carriage frame, and the shaft tip portion is opposed to the electromagnetic coil, and A vacuum circuit breaker characterized in that a fastener is attached and arranged inside the carriage frame.

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