JP2006049240A - Vacuum circuit breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the size and weight of an operation mechanism for transmitting force of opening-closing operation of a vacuum valve, in a vacuum circuit breaker. <P>SOLUTION: This vacuum circuit breaker comprises: holding parts 22 for axially slidably holding movable shafts of the vacuum valves 1, 1; the operation mechanism 31 for carrying out opening-closing operation of the vacuum valves 1 by driving the movable shafts 15; and plate springs 41 for connecting the movable shafts 15 to the operation mechanism 31 to transmit driving force of the operation mechanism 31 to the movable shafts 15. The plate spring 41 moves the movable shaft 15 in the axial direction by the drive of the operation mechanism 31 to drive opening and closing of the vacuum valve 1 even if the driving axial line of the operation mechanism 31 is inclined or deviated with respect to the axial line of the movable shaft 15. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a power vacuum interrupter.

  2. Description of the Related Art A two-contact type vacuum breaker configured by connecting a pair of vacuum valves electrically in series has been used. For example, Patent Documents 1-3 describe a vacuum interrupter that electrically connects movable shafts of a pair of vacuum valves. Patent Document 4 describes a type in which fixed-side energizing shafts of a pair of vacuum valves are electrically connected to each other.

  In any example, only one drive source that opens and closes the contact of each vacuum valve is provided. The force from the driving source is divided into two directions by the operating mechanism and transmitted to the movable shaft of each vacuum valve. For this reason, a rigid link mechanism is used as an operation mechanism.

JP-A-53-23078 Japanese Patent No. 3237445 Japanese Patent No. 3270288 JP 2004-64835 A

  The above-described conventional vacuum interrupter employs a rigid link mechanism as an operation mechanism, and thus has a problem that there is a limit to reduction in size and weight. This problem occurs not only in a vacuum shut-off device using a pair of vacuum valves, but also in a vacuum shut-off device using a single vacuum valve.

  It is an object of the present invention to reduce the size and weight of an operation mechanism that transmits the force for opening and closing a vacuum valve in a vacuum interrupter.

  The present invention includes a holding unit that holds the movable shaft of the vacuum valve so as to be slidable in the axial direction, an operation mechanism that drives the movable shaft to open and close the vacuum valve, the movable shaft, and the operation mechanism. , And a leaf spring that transmits the driving force of the operation mechanism to the movable shaft constitutes a vacuum interrupter.

  According to the present invention, the driving force of the operating mechanism is transmitted to the movable shaft of the vacuum valve by the elastic leaf spring. Since the leaf spring has elasticity, even when the axis of the movable shaft of the vacuum valve and the drive shaft of the operation mechanism are inclined or deviated, a complicated structure such as a link mechanism is not used. The driving force of the operation mechanism can be transmitted to the movable shaft only by the leaf spring.

Further, according to the present invention, when the contact of the vacuum valve is closed, a necessary contact pressure can be applied to the contact by the leaf spring so that the closed state can be maintained.
The present invention is particularly effective when one drive source is provided for a pair of vacuum valves and the force from the drive source is divided into two directions and transmitted to the movable shaft of each vacuum valve.

  According to the present invention, the mechanism for transmitting the force of the opening / closing operation of the vacuum valve is reduced and reduced in weight by using a leaf spring having a simple structure instead of the rigid link mechanism conventionally required in the vacuum interrupter. can do.

  An example in which the present invention is applied to a two-contact type vacuum interrupter will be described with reference to the drawings.

In this example, a two-contact type vacuum interrupter is configured by arranging a pair of vacuum valves in parallel.
Fig. 1-3 is a cross-sectional view showing the configuration and operating state of the vacuum interrupter, Fig. 1 shows the closed state of the vacuum interrupter, Fig. 2 shows the state during the opening operation, and Fig. 3 shows the open state. Indicates the state.

The details of the configuration of the vacuum interrupter will be described with reference to FIG. In FIG. 2 and subsequent figures, some of the symbols are omitted.
1A is a front sectional view, and FIG. 1B is a side sectional view.
Two vacuum valves 1 and 1 are arranged in parallel. The structure of the vacuum valve 1 is well known, and includes a vacuum vessel 11, a fixed shaft 13 that holds the stationary contact 12, a movable shaft 15 that holds the movable contact 14, and a portion where the movable shaft 15 passes through the vessel 11. It is comprised from the bellows 16 and the sealing part 17 for sealing. The movable shaft 15 is formed in a cylindrical shape.

The two vacuum valves 1 and 1 are fixed to one fixing portion 21. Holding portions 22 that hold the movable shaft 15 slidably in the axial direction are provided at both ends of the fixed portion 21. The holding portion 22 is formed in a cylindrical shape, and the movable shaft 15 is accommodated in a hole inside the holding portion 22.
A spring contact 23 for reducing the electrical resistance between the holding portion 22 and the movable shaft 15 is disposed inside the holding portion 22 and is held by either the movable shaft 15 or the holding portion 22.

  In order to regulate the movement range of the movable shaft 15 relative to the fixed portion 22, a drive pin 25 is attached to the movable shaft 15, and a long hole 24 is formed in the holding portion 22. As shown in (B), the drive pin 25 is attached so as to penetrate the movable shaft 15 at a right angle, and is fitted and fixed to the movable shaft 15. Although the long hole 24 is shown as being formed in the movable shaft 15 in the figure, it is actually formed along the axial direction on both side surfaces of the holding portion 22. The drive pin 25 is movable in the axial direction of the movable shaft 15 within a range within the long hole 24.

An insulating operation rod 31 is disposed opposite to the movable shaft 15. The insulating operation rod 31 moves in a direction approaching the movable shaft 15 and a direction away from the movable shaft 15 (up and down in the drawing) by driving of a driving mechanism (not shown). Two drive pins 32 are attached to the insulating operation rod 31.
The drive pin 25 and the drive pin 32 are connected by a leaf spring 41. As shown in (B), the leaf spring 41 is disposed on both sides of the vacuum valve 1 with the holding portion 22 and the insulating operation rod 31 interposed therebetween. The leaf spring 41 is made of FRP which is an electrically insulating material. In addition, the leaf | plate spring 41 can also be comprised with an electroconductive material.

  A rotary joint 42 is attached to both ends of the leaf spring 41. The rotary joint 42 is rotatable with respect to the drive pins 25 and 32, whereby the end portion of the leaf spring 41 can take a free angle with respect to the movable shaft 15 and the insulating operation rod 31. In addition, the edge part of the leaf | plate spring 41 can also be made to attach directly, without making it rotatable. Further, one of the movable shaft 15 and the insulating operation rod 31 can be rotatably attached, and the other can be directly attached. Further, the leaf spring 41 can be configured integrally with the insulating operation rod 31.

  FIG. 1 shows a state in which the contact of the vacuum valve 1 is closed. In this state, the insulating operating rod 31 is closest to the movable shaft 15 side, and the movable shaft 15 is pushed to the fixed shaft 13 side while the leaf spring 23 is bent. Thereby, the contact pressure between the movable contact 14 and the fixed contact 12 is applied.

  In this contact closed state, current flows through the following path. The fixed shaft 13, the fixed contact 12, the movable contact 14, the movable shaft 15, the spring contact 23, and the holding portion 22 of the vacuum valve 1 flow from the holding portion 22 to the fixing portion 21, and the other holding portion 22 and the spring contact It flows with the child 23, the movable shaft 15 of the vacuum valve 1, the movable contact 14, the fixed contact 12, and the fixed shaft 13.

The current interruption operation will be described.
FIG. 2 shows a state at the start of the current interruption operation. From the state shown in FIG. 1, the insulation operating rod 31 is rapidly driven away from the movable shaft 15 by the drive source. When the drive pin 32 moves away from the drive pin 25, the leaf spring 41 is pulled and extended, and the contact pressure of the contact is released.
When the insulating operation rod 31 is further retracted, the movable contact 14 is separated from the fixed contact 12.

Even if the movable contact 14 is welded to the fixed contact 12 during the shut-off operation, the leaf spring 41 can transmit the driving force to the movable shaft 15 in the same manner as the rigid body, so that the welded contact is peeled off. Current interruption.
FIG. 3 shows a state in which the blocking operation has been completed. The movable contact 14 is held at the contact open position. At this time, the leaf spring 41 is configured to have a curvature with respect to the moving direction.

The input operation will be described.
When the closing operation is started from the contact open state of FIG. 3, the insulating operation rod 31 is driven to the movable shaft 15 side. The leaf spring 41 pushes the drive pin 25 in a state where it is bent slightly more than the state of FIG. 3, and the movable contact 14 is driven toward the fixed contact 12.
Even if the movable contact 14 collides with the fixed contact 12, the insulating operation rod 31 is further driven to close. As a result, the leaf spring 41 bends and applies the necessary contact pressure to the contact 12 and the movable shaft 21. The input state is as shown in FIG.

In this example, a pair of vacuum valves 1 are arranged in series to constitute a two-contact type vacuum interrupter.
4-7 is a cross-sectional view showing the configuration of the vacuum interrupter and its operating state. FIG. 4 shows the closed state of the vacuum interrupter, FIG. 5 shows the state during the opening operation, and FIG. Indicates the state. 7 is a side cross-sectional view taken along line AA in FIG.

In the following description, differences from the first embodiment will be described, and a description overlapping with the first embodiment will be omitted.
As shown in FIG. 4, the two vacuum valves 1 are arranged on a straight line with the movable shaft 15 on the inside and the fixed shaft 13 on the outside. The two vacuum valves 1 are fixed to the fixing portion 21. One cylindrical holding portion 22 that holds the two movable shafts 15 and 23 so as to be slidable in the axial direction is attached to the fixed portion 21 (see FIG. 7). Only one cylindrical hole of the holding portion 22 is formed, and the two movable shafts 15 and 15 are accommodated in common.

  The drive direction of the insulating operation rod 31 is set to be perpendicular to the arrangement direction of the vacuum valve 1. Two drive pins 32, 32 are attached to the insulating operation rod 31 in parallel with the axial direction of the movable shaft 15. The drive pin 25 and the drive pin 32 of the movable shaft 15 are connected by a leaf spring 41. The drive pins 25 and the drive pins 32 are connected to each other at distant locations.

  In the closed contact state of FIG. 4, the insulating operation rod 31 is in a position closest to the movable shaft 15. In this state, the leaf spring 41 is compressed and bent, and contact pressure is applied to the movable contact 14 and the stationary contact 12.

The current interruption operation will be described.
FIG. 5 shows a state at the start of the current interruption operation. When the insulating operation rod 31 is suddenly retracted in the direction away from the movable shaft 15, the distance between the drive pin 25 and the drive pin 32 is extended, and the leaf spring 41 is fully extended. When the insulating operation rod 31 is further retracted, the movable shaft 15 and the movable contact 14 are pulled by the leaf spring 41 and the movable contact 14 is separated from the fixed contact 12. FIG. 6 shows a state in which the blocking operation has been completed.

  During the closing operation, the insulating operating rod 31 is driven toward the movable shaft 15 from the state shown in FIG. As a result, the distance between the drive pin 25 and the drive pin 32 is shortened, the leaf spring 41 is compressed, and the movable contact 14 is driven toward the fixed contact 12. The input state is as shown in FIG.

In this example, a pair of vacuum valves are inclined to constitute a two-contact type vacuum interrupter.
FIG. 8-10 is a sectional view showing the configuration of the vacuum interrupter and its operating state. FIG. 8 shows the closed state of the vacuum interrupter, FIG. 9 shows the state during the opening operation, and FIG. Indicates the state.
Also in this example, a different point from Example 1, 2 is demonstrated and the overlapping description is abbreviate | omitted.

  As shown in FIG. 8, the two vacuum valves 1 and 1 are attached to the fixed portion 21 with the axis of the movable shaft 15 inclined. Only one drive pin 32 of the insulating operation rod 31 is provided. The two vacuum valves 1 and 1 are attached to be inclined so that the movable shaft 15 side faces the drive pin 32.

  FIG. 9 shows a state at the start of the current interruption operation. Also in this example, when the insulating operation rod 31 is driven, the distance between the drive pin 25 and the drive pin 32 is extended, and the movable contact 14 is separated from the fixed contact 12 as in the first and second embodiments. The current is cut off. The blocking state is as shown in FIG.

As is clear from the above embodiments, even if the axis of the movable shaft of the vacuum valve and the drive axis of the operating mechanism are inclined or deviated from each other, a complex link can be obtained by using a simple leaf spring. The vacuum valve can be opened and closed without requiring a mechanism.
The example in which the present invention is applied to a two-contact type vacuum interrupter has been described above, but the present invention can also be applied to a vacuum interrupter configured by a single vacuum valve.

It is a figure which shows the state of the contact closed of Example 1 of this invention. It is a figure which shows the state at the time of the contact breaking operation | movement of Example 1 of this invention. It is a figure which shows the state of the contact open of Example 1 of this invention. It is a figure which shows the state of the contact closing of Example 2 of this invention. It is a figure which shows the state at the time of the contact breaking operation | movement of Example 2 of this invention. It is a figure which shows the state of the contact open of Example 2 of this invention. FIG. 5 is a side view of FIG. 4. It is a figure which shows the state of the contact closing of Example 3 of this invention. It is a figure which shows the state at the time of the contact breaking operation | movement of Example 3 of this invention. It is a figure which shows the state of the contact open of Example 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vacuum valve 11 Vacuum container 12 Fixed contact 13 Fixed shaft 14 Movable contact 15 Movable shaft 16 Bellows 17 Sealing part 21 Fixed part 22 Holding part 23 Spring contact 24 Long hole 25 Drive pin 31 Insulation operation rod 32 Drive pin 41 Leaf spring 42 Rotary joint

Claims (8)

A holding part for holding the movable shaft of the vacuum valve slidably in the axial direction;
An operation mechanism for driving the movable shaft to open and close the vacuum valve;
A leaf spring that connects the movable shaft and the operation mechanism, and transmits a driving force of the operation mechanism to the movable shaft;
A vacuum shut-off device comprising:   The vacuum interrupter according to claim 1, wherein a contact load of the vacuum valve is maintained by buckling the leaf spring.   The vacuum interrupter according to claim 1, wherein the leaf spring is rotatably fixed to the movable shaft and the operation mechanism.   The vacuum interrupter according to claim 1, wherein the leaf spring has a curvature in a driving direction when the vacuum valve is open.   The vacuum interrupter according to any one of claims 1 to 4, wherein an axis of the movable shaft and a drive axis of the operation mechanism are inclined or deviated.   The holding portion is a conductive member having a cylindrical hole, and a spring contact is provided between the movable shaft and the movable shaft and the holding portion are brought into electrical contact. The vacuum shut-off device according to any one of claims 1 to 5.   The vacuum interrupter according to claim 1, wherein the leaf spring is made of an electrically insulating material.   8. The vacuum shut-off device according to claim 1, wherein a pair of the vacuum valves are provided, and each of the movable shafts is connected to one operation mechanism by the leaf spring. 9.

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