JPH0562570A - Vacuum switch apparatus - Google Patents

Abstract

PURPOSE:To facilitate fabrication of a vacuum switch device and suppress its size by decreasing insulated shafts. CONSTITUTION:A box-shaped insulated frame 14 is provided at the inside of a bushing 3A on one side through a support 15 and hinge 11. The lower part on the hinge 11 side of this insulated frame 14 is penetrated by a shaft 9 while the other side is pierced by an insulated shaft 5, and a vacuum valve 2 is accommodated in the middle part, and a movable contacting piece 8 is furnished at the other end protrusively. A drive shaft 7 is furnished under the insulated frame 14, and a cam 22 is mounted on this drive shaft 7, and the shaft 9 is fitted in a cam groove 23 on one side of the cam while a roller 12 at the tip of a lever 13 on the insulated shaft 5 is fitted in a cam groove 24 on the other side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum switch in which a disconnecting portion is connected in series to a vacuum valve.

[0002]

2. Description of the Related Art In a vacuum switch in which a disconnection section is connected in series to a vacuum valve, the disconnection section does not have a function of opening / closing a load current or interrupting an accident current. When opening the disconnection part before turning on the vacuum valve, open the disconnection part before the vacuum valve, and this operation requires a predetermined time difference.In addition, load current and It is essential that the accident current should not be opened or closed.

Among conventional vacuum switches with a disconnector,
There is one as shown in FIG. In FIG. 5, a bushing 3 having a vacuum valve 2 fixed to the inside of a cylindrical portion formed on the left side is provided on the right side surface of the outer box 1 for three phases.
Below the left end of the movable shaft 4 of the vacuum valve 2, an insulating shaft 5 that is connected to an operating mechanism (not shown) and opens and closes the movable shaft 4 of the vacuum valve 2 is provided in a direction orthogonal to the plane of the drawing.
The upper end of the insulating lever 5 a formed on is connected to the left end of the movable shaft 4. On the left side surface of the outer box 1, bushings 37, to which the fixed contact 36 of the disconnecting portion is fixed, are provided in the right end axis center for three phases. Above the intermediate portion between the fixed contact 36 and the insulating shaft 5, an insulating shaft 39 driven by an operating mechanism (not shown) is provided.
Is pierced in the direction orthogonal to the paper surface, and a substantially inverted T-shaped movable contact 38 is fixed to the lower surface of the insulating rod 39 with a bolt. The movable contact 38 and the fixed contact 36 connect the disconnecting portion of the vacuum circuit breaker. The movable contactor is formed in FIG.
The lower end of 38 is now joined from the front of the fixed contact 36. The base end of the movable contactor 38 and the movable shaft 4 are connected to the flexible conductor 10 via an L-shaped connection conductor, which is not shown in detail.

FIG. 6 is a diagram showing an open circuit state of the vacuum switch. When the vacuum circuit breaker shown in FIG. 5 is opened as shown in FIG. 6, the operation of the operating mechanism (not shown) causes the insulating shaft 5 to swing counterclockwise as indicated by the arrow E, so that the insulating lever 5a moves. The movable shaft 4 is driven to the left, and the vacuum valve 2
Opens. Then, with a predetermined time difference, the insulating shaft 39 is moved to the arrow D.
6, the movable contact 38 is separated from the fixed contact 36 by swinging in the counterclockwise direction, and swings to a substantially vertical direction as shown in FIG. On the contrary, when the vacuum circuit breaker in the open circuit state of FIG. 6 is closed in the closed circuit state of FIG. 5, the above operation is reversed.

That is, the operation of the operating mechanism (not shown) first causes the insulating shaft 39 to swing clockwise, and the insulating shaft 39 is rotated.
The movable contact 38 fixed to the fixed contact 36 is fixed to the fixed contact 36,
The disconnection section closes. Then, the insulating shaft 5 swings clockwise, the movable shaft 4 is driven to the right, and the vacuum circuit breaker enters the closed state shown in FIG.

[0006]

However, in the vacuum switch having the disconnecting portion constructed as described above, the two insulating shafts of the insulating shaft 5 for opening and closing the vacuum valve 2 and the insulating shaft 39 for the disconnecting portion are provided. Since the outer case 1 becomes large and hinders downsizing, the insulating shafts 5 and 39 have a disk-shaped flange considering the withstand voltage between the phases and the ground (that is, both ends). Since 5b is formed, it takes time to manufacture the mold, and the interphase withstand voltage and the withstand voltage to ground depend on the insulating layer of the epoxy resin formed on the outer periphery of the mandrel of the shaft center,
The degree of adhesion between the insulating layer and the core is important for preventing corona discharge, and the quality control is time-consuming. Therefore, an object of the present invention is to provide a vacuum circuit breaker with a disconnecting section that is easy to manufacture and has a small outer shape.

[0007]

According to the present invention, a pair of bushings are provided through an outer box, a vacuum valve is connected to the inside of the bushing on one side, and a fixed contactor of a disconnecting section is provided on the inside of the bushing on the other side. In a vacuum switch with a disconnecting part, which is provided with an insulating shaft for driving a movable shaft of a vacuum valve, an insulating frame connected to one bushing via a hinge member at an intermediate portion of a pair of bushings and the insulating frame. A drive shaft for swinging the frame is provided, a vacuum valve is housed in the insulating frame, a support shaft is provided on one side and an insulating shaft is provided on the other side, and a movable contactor is attached to and separated from the fixed contactor on the other side. A vacuum switch with a disconnection part, characterized in that the drive shaft is provided with a cam in which the spindle is fitted in the arc groove on one side and the tip of the lever of the insulating shaft is fitted in the arc groove on the other side. Is.

[0008]

As a result, the vacuum valve and the disconnecting portion are opened and closed by the cam swinging by one drive shaft having no insulating coating and the one insulating shaft swinging by the lever. ..

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vacuum switch according to the present invention will be described below with reference to the drawings. However, the same parts as those of the conventional example shown in FIGS. FIG. 1 is an enlarged cross-sectional view showing a main part of a vacuum circuit breaker of the present invention in a closed circuit state, FIG. 2 is an enlarged main part showing only a vacuum valve opened, and FIG. 3 shows a disconnection part also opened. FIG.

In FIG. 1, at the left end of a bushing 3A penetrating the right side of the outer casing 1 of the switch, the bottom of a U-shaped copper-gold composite support 16 is fixed in a plan view (not shown). The pin 15 is inserted at the left end of the support 16,
A hinge 11 made of a copper alloy material having a substantially umbrella shape on the right side is swingably attached to a pin 15 via a contact plate made of a copper alloy plate, which is not shown. The right side of an insulating frame 14 to be described later is fixed to the left side surface of the umbrella-shaped portion of the hinge 11.
A rotary shaft 7 made of a mild steel rod is provided below the intermediate portion of the above, and is supported by bearings (not shown) provided on the outer box 1 at both ends in the direction orthogonal to the plane of the drawing and is connected to an operating mechanism portion (not shown).

The insulating frame 14 is made of polyester resin containing short glass fibers and is formed into a rectangular shape in a plan view (not shown). Partition walls 14a for partitioning the phases are formed inside and partition walls of the same shape are formed at both ends. Also, a shielding plate 14b is formed on the right side, and a support shaft 9 is embedded in the right side of the lower end in the direction orthogonal to the plane of the drawing.

A vacuum valve 2 whose right end is fixed to the left end of the hinge 11 is housed on the right side inside the insulating frame 14, and a conventional example is shown on the left end of the movable shaft 4 of the vacuum valve 2. Similarly to 5, 6, an L-shaped connection conductor, a wipe spring, etc. are inserted and attached, the upper end of the insulating lever 5a is connected to the left end of the wipe spring, and the right end of the flexible conductor 10 is similarly fixed to the upper surface of the connection conductor. Has been done. Furthermore, on the left end of the insulating frame 14,
A movable side contact 8 is provided coaxially with the vacuum valve 2 and the axis of the movable shaft 4, and the left end of the above-mentioned flexible conductor 10 is fixed to the right end of the movable side contact 8 so that the movable side contact 8 is movable. The left end of the child 8 is now mated with the fixed contact 6 fixed to the right end of the bushing 3B from below. The upper end of a strip-shaped lever 13 made of a mild steel plate is fixed to one end of the insulating shaft 5, and the lower end of the lever 13 is connected to the roller 12 via a stepped pin (not shown).
Is attached, and a cam 22 described in detail below with reference to FIG. 4 is fixed to the rotating shaft 7 described above.

FIG. 4 is a diagram showing the shape and operation of the cam 22, of which (a) shows when the vacuum switch and the disconnecting part are both in the closed state, and (b) shows only the vacuum valve. Similarly, (c) shows the case of the open state and the case of the open state. Of these, in FIG. 4A, the arcuate portion 23a from the center to the lower end of the substantially L-shaped first cam groove 23 formed on the right side of the cam 22 defines the axes of the cam 22 and the drive shaft 7. It is formed in a concentric circular arc shape with the center as a center, and the support shaft 9 is fitted in the lower part of the arcuate portion 23a. Therefore, when the drive shaft 7 swings as will be described later, even if the support shaft 9 does not move, the lever
22 is swingable within the range of the arcuate portion 23a.

A second cam groove 24 is provided on the left side of the cam 22.
The arc-shaped portion 24a from the middle portion to the lower end of the cam groove 24 is formed in a concentric arc shape centered on the axis of the drive shaft 7, and the groove formed above the arc-shaped portion 24a is slightly left. It is bent like a letter. Therefore, lever 24
In relation to the lever 13, the roller 12 has an arcuate portion 24a.
Within this range, the lever 13 can swing even if the angle of the lever 13 with respect to the insulating frame 14 does not change. Of these, the cam groove 23
The support shaft 9 is fitted to the cam groove 24, and the roller 12 at the tip of the lever 13 fixed to the insulating shaft 5 is fitted to the cam groove 24.

The operation from the closed state in FIG. 1 to the open state of the disconnection portion shown in FIG. 3 through the open state of the vacuum valve shown in FIG. 2 will be described. In FIG. 1, when an operating mechanism (not shown) makes a circuit opening operation, the insulating shaft 5 causes the cam to move as described later.
The lever 13 that swings together with the roller 20 swings counterclockwise by swinging 22, and the movable shaft 4 of the vacuum valve 2 connected to the tip of the insulating lever 5a is driven left in FIG. 1 to open the circuit. The state shown in FIG. 2 is obtained. Further, when the opening operation of the operation mechanism portion proceeds, the insulating frame 14 swings counterclockwise as shown in FIG. 3 around the pin 15 of the hinge 11 via the support shaft 9 integrated with the insulating frame 14. The movable contactor 8 at the tip of the insulating frame 14 is separated from the fixed contactor 6, and the disconnection portion is opened to open the circuit.

Next, the operation from the open state shown in FIG. 3 to the closed state shown in FIG. 1 will be described. In FIG. 3, the insulating frame 14 is in the open position by closing the operating mechanism (not shown).
2 swings clockwise around a pin 15 via a support shaft 9 integral with the insulating rod 14, and the movable contactor 8 at the tip of the insulating frame 14 fits into the fixed contactor 6, as shown in FIG. As described above, the disconnection section is closed. Further, when the closing operation of the operation mechanism section proceeds, the lever 13
The insulating shaft 5 oscillates in the clockwise direction via the, and the movable shaft 4 is driven to the right so that the vacuum valve 2 shown in FIG. 1 is closed.

Next, the cam 22 shown in FIGS. 4 (a) to 4 (c).
The opening / closing operation by will be described. The operation from the closed state shown in FIG. 4A to the opened state shown in FIG. 4C is performed by opening the cam 22 in the clockwise direction about the drive shaft 7 as a result of the opening operation of the operating mechanism (not shown). 24 lever via roller 20
The insulating shaft 5 integrated with 13 is swung counterclockwise, whereby the vacuum valve shown in FIGS. 1 to 3 is opened. At this time, since the cam groove 23 is an arc centered on the drive shaft 7 as described above, the support shaft 9 integrated with the insulating frame 14 that is fitted does not operate and the closed state of the disconnection portion is (b). It does not change as shown in.

When the opening operation of the operating mechanism further proceeds, the cam
22 also swings further clockwise around the drive shaft 7, and the insulating frame 14 swings counterclockwise around the pin 15 in the cam groove 23 via the support shaft 9 so as to be integrated with the insulating frame 14. The movable contact 8 is separated from the fixed contact 6 shown in FIGS. 1 to 3, and the disconnection portion opens.
At this time, since the cam groove 24 is an arc centered on the drive shaft 7 as described above, the insulating shaft 5 integrated with the lever 13 engaged via the roller 20 does not swing. Therefore, the vacuum valve 2 connected to the insulating shaft 5 is maintained in the open circuit state as shown in FIG. 4 (c).

Next, from the open state of FIG. 4 (c) to FIG.
The operation to reach the closed state of (a) is the reverse of the above, and the cam 22 swings counterclockwise around the drive shaft 7 by the closing operation of the operation mechanism portion (not shown), and the cam groove 23 passes through the support shaft 9. Integrated insulation frame
The movable contactor 8 is engaged with the fixed contactor 6 shown in FIGS. 1 to 3 by pivoting 14 around the pin 15 in the clockwise direction, and the disconnecting part is closed. At this time, since the cam groove 24 is an arc centered on the shaft center of the drive shaft 7 as described above, the roller 20 and the lever 1
3, the vacuum valve 2 shown in FIGS. 1 to 3 connected through the insulating shaft 5 maintains the open circuit state as shown in FIG. 4 (b). Further, when the closing operation of the operation mechanism section progresses, the cam
22 also swings clockwise around the drive shaft 7, swings the insulating shaft 5 integrated with the lever 13 through the roller 20 in the cam groove 24 clockwise, and the vacuum valve shown in FIGS. Cycle 2 At this time, since the cam groove 23 is an arc centered on the shaft center of the drive shaft 7 as described above, the insulating frame integrated with the support shaft 9 is formed.
14 does not swing as in FIGS. 4 (a) and 4 (b). Therefore, the disconnection portion is maintained in the closed state.

As described above, in the vacuum circuit breaker of the present invention, the movable contact 8 constituting the disconnecting portion is provided on the three-phase integrated insulating frame 14 to which the vacuum valve 2 is fixed, and the insulating frame 14 is swung to It is a vacuum circuit breaker that can be configured with only one insulating shaft, can secure a reliable operation sequence and time difference, can be easily manufactured, and can be made compact and lightweight.

[0021]

As described above, according to the present invention, a pair of bushings are provided through the outer box, the vacuum valve is connected to the inside of the bushing on one side, and the fixed contactor of the disconnecting section is provided inside the bushing on the other side. In a vacuum switch with a disconnecting part, which is provided with an insulating shaft for driving a movable shaft of a vacuum valve, an insulating frame connected to one bushing via a hinge member at an intermediate portion of a pair of bushings and the insulating frame. A drive shaft for swinging the frame is provided, a vacuum valve is housed in the insulating frame, a support shaft is provided on one side and an insulating shaft is provided on the other side, and a movable contactor is attached to and separated from the fixed contactor on the other side. The drive shaft is provided with a cam in which the spindle is fitted in the arc groove on one side and the tip of the lever of the insulating shaft is fitted in the arc groove on the other side. A vacuum valve with a swinging cam and one insulated shaft that swings via a lever Since the structure for opening and closing the road section, it is possible to obtain a vacuum switch dated disconnector capable of downsizing the easy production profile.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a main part of a vacuum switch according to the present invention,
The figure which shows a vacuum valve and a disconnection part in a closed state.

FIG. 2 is a vertical sectional view showing a main part of a vacuum switch according to the present invention,
The figure where only the vacuum valve shows the open state.

FIG. 3 is a vertical sectional view showing a main part of the vacuum switch of the present invention,
The figure which shows a vacuum valve and a disconnection part in an open state.

FIG. 4 is a view showing the operation of the vacuum switch of the present invention, (a)
When the vacuum valve and disconnector are both closed, (b)
Shows the case where only the vacuum valve is in the open state, and (c) shows the case where both the vacuum valve and the disconnecting part are in the open state.

FIG. 5 is a vertical sectional view showing an example of a conventional vacuum switch, showing both the vacuum valve and the disconnecting part in a closed state.

FIG. 6 is a vertical cross-sectional view showing an example of a conventional vacuum switch, showing both the vacuum valve and the disconnecting portion in an open state.

[Explanation of symbols]

1 ... Outer box, 2 ... Vacuum valve, 3A, 3B ... Bushing,
4 ... Movable shaft, 5 ... Insulation shaft, 6 ... Fixed contact, 7 ... Drive shaft, 8 ... Movable contact, 9 ... Spindle, 10 ... Flexible conductor, 11 ... Hinge, 12 ... Roller, 13 ... Lever, 14 ... Insulating frame, 15 ... Pin, 16 ... Support, 22 ... Cam, 23, 24 ... Cam groove.

Claims (1)

[Claims] 1. A pair of bushings are pierced through an outer box, a vacuum valve is connected to the inside of the bushing on one side, and a fixed contact of a disconnecting section is provided on the inside of the bushing on the other side. In a vacuum switch with a disconnecting part provided with an insulating shaft for driving the movable shaft of the above, an insulating frame connected to the bushing on one side via a hinge member and an insulating frame connected to the bushing in the middle part of the pair of bushings. A movable contactor, which is provided with a drive shaft for moving, accommodates the vacuum valve in the insulating frame, has a support shaft on one side and the insulating shaft on the other side, and contacts and separates from the fixed contactor on the other side. A vacuum switch, wherein the drive shaft is provided with a cam in which the support shaft is fitted in an arc-shaped groove on one side and the tip of the lever of the insulating shaft is fitted in an arc-shaped groove on the other side. ..