JPH08273501A - Vacuum circuit breaker - Google Patents

Abstract

PURPOSE: To provide a vacuum circuit breaker realizing miniaturization, large capacity, and a sufficient insulating distance between circuit conductors, by contacting and separating the movable contact of the other end part of an operation rod, wherein one end part is slidably engaged with the inner peripheral surface of a slide contact piece, with and from a fixed contact. CONSTITUTION: This device is slidably engaged with the inner peripheral surface of a slide contact piece 42, provided on the middle part of a base 33, from one-end parts of operation rods 40 and 41. When they are slidably moved via a link, joining to insulating rods 51 and 51, the other end parts of the rods 40 and 41 are electrically connected with fixed contacts 36 and 37 being in accordance with movable contacts 38 and 39 provided respectively. A vacuum circuit breaker, realizing miniaturization, large capacity, a sufficient insulating distance between circuit base bodies, can be provided by this constitution.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum breaker, and more particularly to a structure of a current collector and a movable operation part of a vacuum breaker.

[0002]

2. Description of the Related Art FIG. 7 is a cross-sectional view showing the structure of a conventional multi-point cut vacuum interrupter disclosed in, for example, Japanese Patent Laid-Open No. 53-23078, and FIG. 8 shows the interrupted state of the vacuum interrupter in FIG. FIG. In the figure, 1 is a support insulator tube, 2 is a conductive base mounted on the support insulator tube 1,
Reference numeral 3 is a vacuum circuit breaker arranged coaxially on both ends of the base 2, and a pair of fixed contacts 4 and movable contacts 5 are arranged in the airtight container so that they can be brought into contact with and separated from each other. Reference numeral 6 denotes an operation rod which has one end connected to the movable contact 5, penetrates the airtight container through the bellows 7, and has the other end extending toward the center of the base 2.

Reference numeral 8 is a substantially central portion of the base 2, and an operating rod 6
Is an insulating rod that moves in a direction perpendicular to the center line of the actuator by driving an operating portion (not shown), and 9 is a guide tool that is disposed below the base 2 to support and slide the insulating rod 8. A pin protruding from the tip of the insulating rod 8, a roller 11 pivotally supported on the other end of the operating rod 6, and a guide rod 12, 13 slidably guided in the contact and separation directions of both contacts 4, 5,
14 and 15 are pins 10 having one end protruding from the insulating rod 8.
A link that is pivotally attached to the operation rod 6, and the other end is pivotally attached to the operation rod 6,
Reference numeral 16 is a contact pressure spring, 17 is a sliding contactor that supports the operating rod 6, and 18 is a conductive cylindrical shape that supports the sliding contactor 17 and electrically connects the sliding contactor 17 and the base 2. It is a bearing.

Next, the operation of the conventional multi-point disconnection vacuum interrupter constructed as described above will be described. First, FIG.
When the insulating rod 8 is pushed downward as shown by the arrow by driving the operating portion in the closing state shown in FIG.
Both links 14 and 15 rotate about the pin 10 in the directions opposite to each other. By this rotation, the roller 11 is slidably guided by the guide rods 12 and 13 to move. Along with this movement, the movable contact 5 connected to one end of the operating rod 6
However, the fixed contact 4 is disengaged and the cut-off state shown in FIG.

On the other hand, in the cut-off state shown in FIG. 8, when the insulating rod 8 is pushed upward as shown by the arrow by driving the operating portion, both links 14 and 15 are pushed into the pin 10.
Rotate in the directions of separating from each other. By this rotation, the roller 11 is slidably guided by the guide rods 12 and 13 to move, and with this movement, the movable contact 5 connected to one end side of the operation rod 6 comes into contact with the fixed contact 4 and the contact pressure spring. A predetermined contact pressure is urged by 16 to enter the closed state shown in FIG. 7. And the current is fixed contact 4 →
The flow moves in the order of the movable contact 5, the operation rod 6, the sliding contact 17, the cylindrical bearing 18, and the base 2, and is conducted to the other pole side (not shown).

FIG. 9 is a front view showing the structure of a conventional one-point-cut vacuum interrupter different from the above, and FIG. 10 is a front view showing the interrupted state of the vacuum interrupter in FIG. In the figure, 19 is a vacuum switch tube, 20 and 21 are fixed contacts and movable contacts which are arranged in the vacuum switch tube 19 so as to be able to come into contact with and separate from the vacuum switch tube 19, and 22 is an end portion of the fixed contact 20 that supports and supports the vacuum switch tube 19. Is a first circuit conductor electrically connected to.

Reference numeral 23 is a movable conductor that supports the end portion of the movable contact 21 and is electrically connected thereto. Reference numeral 24 is a second circuit conductor.
Reference numeral 25 is a flexible conductor connecting the second circuit conductor 24 and the movable conductor 23, 26 is an insulating rod connected to the lower side of the movable conductor 23, and 27 is locked to the lower end of the insulating rod 26. The link is constantly urged downward by a predetermined force by a contact pressure spring 28. Reference numeral 29 is a drive shaft for transmitting the operation of a drive unit (not shown), and 30 is a lever having one end fixed to the drive shaft 29 and the other end engaged with the link 27 via a pin 31.

Next, the operation of the conventional one-point-cut vacuum interrupter configured as described above will be described. First, FIG.
As shown in 0, when the contacts 20 and 21 are in the cut-off state and the drive shaft 29 is rotated in the direction shown by the arrow in the drawing by the operation of the drive unit (not shown), the lever 30 is rotated to push up the link 27. This upward movement of the link 27 raises the insulating rod 26 via the contact pressure spring 28 to bring the movable contact 21 into contact with the fixed contact 20 and bring it into the closed state as shown in FIG. At this time, the contact pressure spring 28 is compressed and applies a pressing force to the movable contact 21. Then, the current flows in the order of the first circuit conductor 22, the fixed contact 20, the movable contact 21, the movable conductor 23, the flexible conductor 25, and the second circuit conductor 24.

[0009]

Since the conventional multi-point disconnection vacuum interrupter is constructed as described above, the slide contactor 17 and the cylindrical bearing 18 are required for each vacuum interrupter 3, so that Since the size of both contacts 4 and 5 in the contacting / separating direction becomes long and large, and since the conductive path also becomes a long distance and the resistance becomes large, there is a problem that the heat generation during energization increases and the energizing capacity cannot be increased. there were.

Further, since the conventional one-point-cut vacuum interrupting device is constructed as described above, in order to insulate the movable conductor 23 side forming a part of the conduction circuit from the grounded drive shaft 29 side. Since it is necessary to interpose the insulating rod 26, the dimension in the height direction becomes long and the size becomes large, and the dimension between the first circuit conductor 22 and the second circuit 24 becomes short, so that the insulation distance is reduced. There was a problem that it could not be taken sufficiently.

The present invention has been made in order to solve the above-mentioned problems, and provides a vacuum interrupter capable of downsizing, increasing the capacity, and ensuring a sufficient insulation distance between circuit conductors. The purpose is.

[0012]

According to a first aspect of the present invention, there is provided a vacuum interrupting device, wherein a pair of fixed contacts and movable contacts, which are respectively disposed on both end side coaxial centers of a base and can be contacted and separated, and each movable contact. A pair of operating rods, one end of which is connected to the contacts and the other end of which extends toward the center of the base and is slidable along the shaft center, and a direction perpendicular to the shaft center at the center of the base. The insulating rod that slides both operating rods through the link by moving to and the inner peripheral surface that is located on the shaft center of the center of the base can slide on the outer peripheral surface on the other end side of both operating rods. And a sliding contact that electrically connects the two operating rods by fitting them together.

Further, according to a second aspect of the present invention, there is provided a vacuum interrupting device according to the first aspect, wherein a groove formed along the outer peripheral surface is formed on the base in a substantially central portion of the sliding contact. By fitting with a member, the movement of the sliding contact along the axis is regulated.

According to a third aspect of the present invention, there is provided the vacuum interrupting device according to the first aspect, wherein the link is arranged outside the outer circumference of the sliding contact.

According to a fourth aspect of the present invention, there is provided a vacuum interrupting device in which a pair of fixed contacts and movable contacts are arranged so that they can be contacted and separated from each other, and one end is connected to an end of the movable contact. An operating rod that is slidable in a predetermined direction, and a drive shaft that is connected to a predetermined position of the operating rod via an insulating lever to slide the operating rod by rotating, and the end of the fixed contact and the operating rod. And the other end portion of each of them is connected to a circuit conductor.

[0016]

In the sliding contact of the vacuum interrupting device according to the first aspect of the present invention, the inner peripheral surface is slidably fitted to the outer peripheral surfaces on the other end side of both operation rods, so that the operation is performed through both operation rods. Electrically connects both movable contacts.

Further, in the sliding contact of the vacuum interrupting device according to the second aspect of the present invention, the groove formed along the outer peripheral surface fits with the regulating member, and the movement along the axis is regulated.

Further, the link of the vacuum interrupting device according to the third aspect of the present invention is arranged outside the outer circumference of the sliding contactor to prevent interference with the sliding contactor.

Further, the drive shaft of the vacuum interrupting device according to claim 4 of the present invention is connected to the operating rod via an insulating lever at a position closer to the contact side than the connecting position with the circuit conductor, and is rotated. Slide the operating rod.

[0020]

【Example】

Example 1. Embodiments of the present invention will be described below with reference to the drawings. 1 is a cross-sectional view showing a configuration of a main part of a vacuum shut-off device in a shut-off state according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view showing a configuration of a main part in a closed-state of the vacuum shut-off device of FIG. Is the line III-II in FIG.
FIG. 4 is a cross-sectional view showing a cross section taken along I, and FIG. 4 is a perspective view showing the external appearance of the sliding contact of the vacuum interrupting device in FIG.

In the figure, 32 is a support insulator pipe, 33 is a base mounted and fixed on the support insulator pipe 32, and 34, 35.
Are vacuum circuit breakers disposed at both ends of the base 33, respectively, and a pair of fixed contacts 36 and 37 and movable contacts 38 and 39 are attached to and detachable from each other in the airtight container.
Are arranged coaxially. Reference numerals 40 and 41 are operation rods, one end of which is connected to the movable contacts 38 and 39, penetrate the airtight container via a bellows (not shown), and the other end side thereof extends to the central portion of the base 33.

Reference numeral 42 designates a sliding contact for electrically connecting the other ends of the operation rods 40 and 41, which is divided into a plurality of parts in the circumferential direction by a slit 43a as shown in FIG. A cylindrical contact piece 43 having an annular groove 43b formed in the center and a garter spring 44 that binds the outer peripheral surfaces of both ends of the contact piece 43 and urges a force in the direction perpendicular to the axis. The inner peripheral surface of the contact piece 43 is slidably fitted to the outer peripheral surfaces on the other end side of both operation rods 40 and 41.

The one end 45 is fixed to the base 33 and the other end is fitted into the groove 43b of the contact piece 43, thereby restricting the movement of the sliding contact 42 along the axis and preventing the deviation. Members, 46 and 47 are first pins that penetrate both operation rods 40 and 41 at predetermined positions and project to both sides, and a pair of pins 48 and 49 are pivotally supported on both sides of the first pins 46 and 47, respectively. 3, the links, which will be described later, are arranged so as to be outside the outer circumference of the sliding contact 42, and are slidable by being guided by a guide groove 50 formed on the base 33. It is arranged. Reference numeral 51 is an insulating rod that moves up and down in the direction perpendicular to the center lines of the operating rods 40 and 41 by driving an operating portion (not shown) in the support insulator tube 32, and a small diameter portion 51a is formed at the tip. .

Reference numeral 52 denotes a cylindrical member which has an insulating rod 51 penetrating the bottom thereof, and a side portion of which is arranged concentrically with the insulating rod 51.
3 is arranged at the bottom of the base 33, and the flange portion 53 is provided at the upper end.
An annular guide tool having a and an inner peripheral surface 53b formed to have a curvature, and the inner peripheral surface 53b supports the outer peripheral surface of the tubular member 52. 54 is the small diameter portion 5 of the insulating rod 51.
It is a connecting fitting slidably fitted to 1a.

55 and 56 are provided on both sides of the connecting fitting 54 in a direction perpendicular to the center line of the insulating rod 51 and on both contacts 3
A second pin 57 projectingly provided at a position spaced apart by a predetermined distance in the contact and separation directions of 6, 38, a fixing member 57 fixed to the tip of the insulating rod 51 and restricting the upward movement of the coupling fitting 54, 58.
Is a contact pressure spring housed in the tubular member 52, and
4 is pressed against the regulating member 57, and the connecting fitting 54 and the tubular member 5 are
A predetermined force is applied between the bottom and the bottom of the two. 59, 60
Is a pair of links, one end of which is pivotally supported by the first pins 46 and 47 and the other end of which is pivotally supported by the separated second pins 55 and 56, and which intersect in an X shape.

Next, the operation of the vacuum interrupter in the first embodiment constructed as described above will be explained. First,
In the cut-off state shown in FIG. 1, when the insulating rod 51 is pushed upward by the drive of the operating portion as indicated by the arrow in the figure, the connecting fitting 54 contacts the regulating member 57 via the contact spring 58. , And is lifted up as it is, and the positions of the second pins 55 and 56 move upward. Then, the other ends of the links 59 and 60 pivotally supported by the second pins 55 and 56 are pushed up, and the one ends move in the separating directions.

With this movement, both rollers 48,
49 slides by being guided by the guide groove 50, and both operating rods 40 and 41 connected to the guide groove 50 move outward to move the movable contacts 38 and 39 to the corresponding fixed contacts 3.
6 and 37 are brought into contact with each other, and the state shown in FIG. The contact between these two contacts 36, 38 and between 37, 39 is maintained at the contact pressure set by the contact pressure spring 58, and the current is fixed contact 36 → movable contact 38 → operation rod 40.
→ sliding contact 42 → operating rod 41 → movable contact 39 →
It flows in order of the fixed contactor 37.

When a force greater than the contact pressure set by the contact pressure spring 58 acts on the insulating rod 51, the connecting fitting 54
The position of is not changed and only the insulating rod 51 is lifted,
As shown in FIG. 2, a gap is formed between the coupling fitting 54 and the restriction member 57, and no further force is transmitted, so that a predetermined contact pressure is always maintained.

On the other hand, in the closed state shown in FIG. 2, when the insulating rod 51 is pushed down by the drive of the operating portion as shown by the arrow in the figure, first, the regulating member 57 comes into contact with the connecting fitting 54, The two pins 55 and 56 are integrally pushed down and the positions of the second pins 55 and 56 are moved downward. Then, the other ends of both the links 59, 60 pivotally supported by the second pins 55, 56 are pushed down, and the one ends move in the approaching directions. Along with this movement, the rollers 48 and 49 are guided by the guide groove 50 and slide, and the operation rods 40 and 41 connected to the rollers move inward to move the movable contacts 38 and 39, respectively. The fixed contacts 36 and 37 are disengaged from each other, and the cut-off state shown in FIG. 1 is obtained.

As described above, according to the first embodiment, the base 3
The outer peripheral surfaces of the other ends of both operation rods 40 and 41 and the sliding contact 4 in which the inner peripheral surfaces thereof are slidably fitted in substantially the central portion of 3
2 is arranged to form a conduction path,
Since it is not necessary to provide a current collector for each of the vacuum breakers 34 and 35, and the size is greatly reduced accordingly, the device can be downsized, and the distance as a conduction path can be greatly shortened. As a result, the resistance becomes small and the heat generation at the time of energization becomes small, so that the capacity can be increased.

Furthermore, the groove 43b formed on the outer peripheral surface of the contact piece 43 is fitted to the regulating member 45 to prevent the sliding contact 42 from being displaced, so that both operations can be performed. The contact between the rods 40 and 41 can be made possible without increasing the sliding resistance, and the link 59
Are arranged on the outer side of the outer circumference of the sliding contact 42 so as to overlap in position, so that the size is reduced by that amount, and the device can be downsized.

Example 2. 5 is a front view showing the configuration of the vacuum interrupting device in the interrupted state according to the second embodiment of the present invention, and FIG. 6 is a front view showing the configuration of the vacuum interrupting device in the closed state of FIG. In the figure, the same parts as those of the conventional device shown in FIG. Reference numeral 61 denotes an operation rod whose one end is connected to the end of the movable contact 21 and is constantly urged by a contact pressure spring 62 in a direction away from the movable contact 21 with a predetermined force. 63 is a pin projecting at a position inside the position where the movable conductor 23 of the operating rod 61 is connected, and 64 is a drive shaft 65 whose one end transmits the operation of a drive unit (not shown).
, The other end is engaged with the pin 63 through the engagement groove 64a,
It is a lever formed of an insulating member.

Next, the operation of the vacuum interrupter in the second embodiment constructed as described above will be explained. First,
As shown in FIG. 5, when the contacts 20 and 21 are shut off, the drive shaft 65 rotates in the direction shown by the arrow in the drawing by the operation of the drive unit (not shown), and the lever 64
Is rotated to push up the pin 63 through the engagement groove 64a. The operation rod 61 integrated with the pin 63 also moves upward, and the movable contact 21 is moved through the contact pressure spring 62.
Is brought into contact with the fixed contact 20 and brought into a closed state as shown in FIG. At this time, the contact pressure spring 62 is compressed and applies a pressing force to the movable contact 21. Then, the current is the first circuit conductor 22, the fixed contact 20, the movable contact 21, the operating rod 61, the movable conductor 23, and the flexible conductor 25.
→ Flows in the order of the second circuit conductor 24.

As described above, according to the second embodiment, the pin 63 is projectingly provided on the movable contact 21 side from the position where the second circuit conductor 24 of the operating rod 6 is connected, and is rotated by the drive shaft 65. Since the lever 64 is made of an insulating material and the lever 64 is engaged with the pin 63 to operate the movable contact 21, the insulating rod 26 in the conventional device can be omitted. Since the dimension in the height direction is shortened by this amount and the size can be reduced, and the connection position with the second circuit conductor 24 is the outermost end, the insulation distance between both circuit conductors 22 and 24 is also in the height direction. Even though the dimensions are shortened, it can be sufficiently taken.

[0035]

As described above, according to the first aspect of the present invention, a pair of fixed contacts and movable contacts which are respectively disposed on both end side coaxial centers of the base and can be contacted and separated, and each movable contact. A pair of operating rods with one end connected to each other and the other end extending toward the center of the base and slidable along the axis. By doing so, the insulating rod that slides both operating rods through the link and the inner peripheral surface that is arranged on the axial center of the substantially central portion of the base are slidably fitted to the outer peripheral surface on the other end side of both operating rods. Since it is provided with the sliding contactor which electrically connects the both operating rods by combining them, it is possible to provide a vacuum interrupting device capable of being downsized and having a large capacity.

According to the second aspect of the present invention, the sliding contact is formed by fitting the groove formed along the outer peripheral surface in the substantially central portion of the sliding contact with the restricting member protruding from the base. Since the movement of the dynamic contactor along the axis is restricted, it is possible not only to make it compact and to increase the capacity, but also to make contact between both operating rods without increasing sliding resistance. It is possible to provide a simple vacuum interrupting device.

According to the third aspect of the present invention, since the link is arranged outside the outer circumference of the sliding contact, it is of course possible to increase the capacity and further downsize. It is possible to provide a vacuum interrupter capable of

According to a fourth aspect of the present invention, a pair of fixed contact and movable contact which are arranged so as to be able to come into contact with and separate from each other, and one end of which is connected to an end portion of the movable contact are slidable in the contact and separation directions of both contacts. An operating rod that is movable, and a drive shaft that is connected to a predetermined position of the operating rod via an insulating lever to slide the operating rod by rotating, and the end of the fixed contact and the other end of the operating rod. Since the side end portions are respectively connected to the circuit conductors, it is possible to provide a vacuum cutoff device which can be downsized and which can ensure a sufficient insulation distance between the circuit conductors.

[Brief description of drawings]

FIG. 1 is a sectional view showing a configuration of a main part of a vacuum interrupting device in an interrupted state according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a configuration of a main part in a closed state of the vacuum interrupter in FIG.

FIG. 3 is a cross-sectional view showing a cross section taken along line III-III in FIG.

FIG. 4 is a perspective view showing the external appearance of a sliding contact of the vacuum interrupter in FIG.

FIG. 5 is a front view showing the configuration of a vacuum interrupting device in an interrupted state according to Embodiment 2 of the present invention.

FIG. 6 is a front view showing the configuration of the vacuum interrupting device in FIG. 5 in a closed state.

FIG. 7 is a cross-sectional view showing the configuration of a conventional multi-point cut vacuum interrupter.

8 is a cross-sectional view showing a cut-off state of the vacuum cut-off device in FIG.

FIG. 9 is a front view showing the configuration of a conventional one-point-cut vacuum interrupting device.

10 is a front view showing the configuration of the vacuum interrupting device in FIG. 9 in an interrupted state.

[Explanation of symbols]

19 vacuum switch tube, 20, 36, 37 fixed contact, 21, 38, 39 movable contact, 22 1st
Circuit conductor, 24 second circuit conductor, 40, 41, 61
Operation rod, 42 sliding contact, 43 sliding contact,
43a slit, 43b groove, 44 gutter spring, 45, 57 regulating member, 46, 47 first pin,
48, 49 rollers, 50 guide groove, 51 insulating rod, 52 tubular member, 53 guide tool, 54 connecting fitting,
55,56 2nd pin, 58,62 Contact pressure spring, 5
9,60 link, 63 pin, 64 lever, 64a
Engagement groove, 65 Drive shaft.

Claims (4)

[Claims] 1. A pair of fixed and movable contacts, which are respectively disposed on both ends of the base on the same side of the coaxial center and can be brought into contact with and separated from each other, and one end of each of the movable contacts and the other end of the base. A pair of operation rods that extend to the center side and are slidable along the axis, and a pair of operation rods that move in a direction perpendicular to the axis at the substantially central portion of the base to operate the two operations via links. An insulating rod for sliding the rod, and an inner peripheral surface disposed on the axial center of substantially the center of the base so that the inner peripheral surfaces are slidably fitted to the outer peripheral surfaces on the other end side of the both operating rods. A vacuum cutoff device comprising a sliding contact for electrically connecting the operating rods. 2. The movement of the sliding contact along the axial center is restricted by fitting a groove formed along the outer peripheral surface in the substantially central portion with a restricting member protruding from the base. The vacuum cutoff device according to claim 1. 3. The vacuum interrupting device according to claim 1, wherein a link is arranged outside the outer circumference of the sliding contact. 4. A pair of fixed contact and movable contact, which are arranged so as to be contactable and separable, one end of which is connected to an end portion of the movable contact, and an operating rod which is slidable in the contacting and separating direction of the both contacts. A drive shaft which is connected to a predetermined position of the operating rod through an insulating lever and slides the operating rod by rotating the operating rod; and the end portion of the fixed contact and the other end portion of the operating rod. A vacuum interrupter characterized in that each is connected to a circuit conductor.