JP2013125717A - Vacuum switching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that although a conventional release spring is in tandem shaft train arrangement for a contact pressure spring, a space combining the length of the release spring and the length of the contact pressure spring is required as a movable part space of a switching device, and compaction of the switching device is limited.SOLUTION: The vacuum switching device comprises a vacuum valve including a fixed electrode rod penetrating a vacuum container supported by a housing and having a fixed electrode at the inner end, and a movable electrode rod penetrating the vacuum container retractably and having a movable electrode coming into contact with the fixed electrode or separating therefrom at the inner end, a pressure contact spring provided at the outer end of the movable electrode rod and imparting a contact pressure between both electrodes when they are closed, and a release spring provided at the outer end of the movable electrode rod and urging release when both electrodes are released. The pressure contact spring and the release spring are composed of compression springs having different winding diameters, and the release spring is arranged on the same axis as the movable electrode rod so as to surround the outside of the pressure contact spring.

Description

  The present invention relates to a vacuum switchgear used for, for example, a high-voltage power distribution facility for electric power.

  The open spring device in the conventional vacuum switchgear can be configured in a small size and at low cost by arranging a shaft array with respect to the contact pressure spring, reducing the load after touching the contact at the time of closing, and reducing the operating force of the operating mechanism. An opening / closing device is provided with an operating mechanism. In addition, as a market requirement, there is a demand for extending the life of the switching device, that is, increasing the number of switching operations. For this reason, the device is large in order to respond by reducing the generated stress by increasing the cross-sectional area of the insulator. It was converted.

JP 2004-342359 A

The open spring of the conventional vacuum switchgear (Patent Document 1) is characterized in that the shaft is arranged in a skewered manner with respect to the contact pressure spring. The open spring length and the contact pressure spring are used as the movable part space of the switchgear. A space in the axial direction combined with the length is required, which is a limitation in configuring the switchgear in a small size.
In addition, as market requirements, there is a demand for extending the life of the switching device, that is, increasing the number of switching operations, and it is generally a problem to extend the switching life. This is the durability performance of the insulating rod. In order to solve this, it is necessary to take measures to increase the strength of the insulating rod or to reduce the external force applied to the insulating rod. To increase the strength of the former, it is conceivable to increase the cross-sectional area of the insulating rod, but this is in contradiction to the market demand for downsizing the switchgear due to the increase in size. In order to improve, it is advantageous to reduce the force applied to the insulating rod itself. However, in order to reduce the force applied to the insulating rod, generally, there is only a measure such as slowing the opening / closing speed, which also has a problem of being a trade-off with the current opening / closing performance.

  The vacuum switchgear according to this invention penetrates a vacuum vessel supported by a housing, and has a fixed electrode rod having a fixed electrode at an inner end, and passes through the vacuum vessel so as to freely advance and retract, and the fixed electrode at an inner end. A vacuum valve provided with a movable electrode rod having a movable electrode that is separated from and in contact with the movable electrode rod, a contact pressure spring that is provided on the outer end side of the movable electrode rod and applies a contact pressure between the electrodes when the electrodes are closed, and Provided on the outer end side of the movable electrode rod, and provided with an open spring that releases when both electrodes are opened, and the contact spring and the open spring are composed of compression springs having different winding diameters. The open spring is arranged on the same axis of the movable electrode rod so as to surround the outside of the contact pressure spring.

  The vacuum switchgear according to the present invention is provided on the outer end side of the movable electrode bar, provided on the outer end side of the movable electrode bar, and provided on the outer end side of the movable electrode bar. Since the open springs that are released when both electrodes are opened are constituted by springs having different winding diameters, and the open springs are arranged on the same axis of the movable electrode bar so as to surround the outside of the contact pressure springs. The vacuum switchgear itself can be made compact and inexpensive, and it can fully meet the demand for a large number of times of opening and closing and can extend the life of the switchgear.

It is sectional drawing which shows the main circuit single pole part (opening state) of the switchgear in Embodiment 1 of this invention. BRIEF DESCRIPTION OF THE DRAWINGS The opening / closing state of the switchgear in Embodiment 1 of this invention is shown, (a) is sectional drawing which shows a closing state, (b) is sectional drawing which shows an opening state. It is a graph which shows the load characteristic showing the relationship between the contact pressure spring and the open spring in the vacuum switchgear of this invention. It is sectional drawing which shows the modification of the switchgear in Embodiment 1 of this invention.

Embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1
In FIG. 1, the vacuum switchgear includes an insulating mold frame (housing) 1 and a vacuum valve 2 supported by the insulating mold frame 1.
The vacuum valve 2 passes through the vacuum vessel 3, the fixed electrode rod 4 having a fixed electrode 4a at the inner end, and the vacuum vessel 3 so as to freely advance and retract, and the fixed electrode 4a at the inner end. And a movable electrode bar 5 having a movable electrode 5a that is in contact with and away from.
The outer end side of the fixed electrode 4 a is supported by the insulating mold frame 1 together with the upper terminal 7 by means of bolts 6.
The movable electrode rod 5 that penetrates the vacuum vessel 3 so as to freely advance and retreat and extends downward (FIG. 1) has an outer end portion 8 of the movable electrode rod 5 that is a portion protruding from the vacuum vessel 3 at its end portion. It is connected to a lower terminal 10 attached to the insulating mold frame 1 through a flexible conductor 9.

  A threaded hole is formed in the outer end 8 of the movable electrode bar 5 projecting outward from the movable electrode guide 2a, which is a part of the vacuum valve 2, and a connecting portion constituting a part of the movable electrode bar 5 is formed in the screw hole. The threaded portion of the rod 12 is screwed, and the flexible conductor 9 is fixedly connected by the nut 13 screwed into the threaded portion, and the connecting rod 12 is fixed to the movable electrode rod 5. Thus, an extension of the movable electrode bar 5 is formed.

The insulating rod 17 is inserted through the through hole 12b below the connecting rod 12 into the inner chamber 12c of the connecting rod 12 so that the upper end male thread portion can move in the axial direction. The upper end portion of the insulating rod 17 is prevented from coming off from the inner chamber lower surface 12e by a nut 16 screwed into the upper end male screw portion in the downward direction, and the upper end male screw portion abuts against the inner chamber upper surface 12d in the upper direction. Thus, the moving range is restricted and the connected state is established.
One end of the link lever 20 is connected to a link 23 of an operation mechanism 22 described later by a support shaft 21a.
The lower end of the insulating rod 17 is connected to the other end of the link lever 20 by a support shaft 21b.
As described above, the link lever 20 having both ends connected to the lower end of the insulating rod 17 and the lower end of the link 23 is pivotally supported on the insulating mold frame 1 by the link shaft 21.

The connecting rod 12 has a trumpet-shaped spring seat 12a on the lower side (FIG. 1), and an opening that is a compression coil spring is provided between the upper surface of the spring seat 12a and the support plate 14 of the insulating mold frame 1. A spring 15 is stretched.
The upper end of the release spring 15 is received and supported by an annular ring 14 a having an L-shaped cross section attached coaxially to the movable electrode bar 5 on the lower surface of the support plate 14. To prevent it from moving in the radial direction. In this sense, the annular ring 14a is a means for preventing the opening spring 15 from moving in the radial direction with respect to the movable electrode rod 5, and a concave portion or a convex portion is provided instead of the annular ring, or the outer peripheral portion of the movable electrode guide 2a is provided. An equivalent lateral shift prevention function can be provided by contacting the inner periphery of the open spring 15.

As described above, one end of the open spring 15 is in contact with the support plate 14 of the insulating mold frame 1 on the fixed side via the annular ring 14 a, and the other end is connected to the movable electrode rod 5 and the spring seat portion of the connecting rod 12. 12a, it can be said that it is provided between the insulating mold frame 1 and the movable electrode rod 5, and the insulating mold in which the open spring 15 is a part of the casing through the support plate 14. It can also be said that it is provided on the frame 1.
Further, one end of the open spring 15 can be directly supported not by the support plate 14 but through another appropriate fixing member (for example, an insulating housing) or by the insulating mold frame 1. The spring seat 12a is fixed with respect to the movable electrode bar 5 and does not move because the connecting rod 12 is fixed by the nut 13.
Furthermore, the opening spring 15 is for pulling the movable electrode 5a with respect to the fixed electrode 4a during the opening operation and holding it at the opening position shown in FIGS. 1 and 2B (opening holding). It is a compression coil spring fitted on the outer periphery of the electrode bar 5.

A contact pressure spring 18 is stretched between the recess on the lower surface of the trumpet spring seat 12 a of the connecting rod 12 and the stepped portion of the insulating rod 17, that is, between the movable electrode bar 5 and one end of the link lever 20.
The contact pressure spring 18 is a compression coil spring that applies contact pressure between the fixed electrode 4a and the movable electrode 5a. The release spring 15 and the contact pressure spring 18 are composed of compression springs having different winding diameters. The open spring 15 is arranged on the same line as the extension shaft of the movable electrode bar 5 so as to surround the outside of the contact pressure spring 18 so that the axial length is shortened as a whole.

  As shown in FIG. 3, the open spring 15 and the contact pressure spring 18 have a spring action that the open pressure 15 applies to the movable electrode 5a. It is set to be larger than the initial force (point C in the figure), and in the example shown, the spring constants of the open spring 15 and the contact pressure spring 18 are set so as to satisfy this relationship.

Next, the operation from the open state to the closed state will be described with reference to FIGS.
1 and FIG. 2B, the connecting rod 12 is pushed down by the opening spring 15, the insulating rod 17 is pushed down by the contact pressure spring 18, and the support shaft 21b is further passed through the insulating rod 17. The link lever 20 connected by the push-up pushes the link 23 and the operation mechanism 22 and is held at the position shown in the figure, and the movable electrode 5a is in the open position.
At this time, both the open spring 15 and the contact pressure spring 18 are in an initial compressed state (initial load), and both are in their maximum stretched state.

During the closing operation, a driving operation force from the operation mechanism 22 is applied via the link 23, the link lever 20 rotates clockwise about the link shaft 21, and the insulating rod 17 moves upward in the drawing. Pushed up.
The force transmitted to the insulating rod 17 is transmitted to the movable electrode bar 5 via the contact pressure spring 18 and the connecting rod 12, and the movable electrode bar 5 moves upward.
At that time, when the release spring 15 is compressed between the support plate 14 and reaches the point E in FIG. 3, it becomes equal to the initial load C of the contact pressure spring 18, and the contact pressure spring 18 starts to be compressed together with the release spring 15.

Further, when the point B in FIG. 3 is reached, the movable electrode 5a comes into contact with the fixed electrode 4a to be in a contact touch state.
After the contact touch, the movable electrode bar 5 and the spring seat portion 12a do not move upward any more, and therefore the open spring 15 is not further compressed.

After that, the link lever 20 is further rotated clockwise by the operating mechanism 22 to push up the insulating rod 17, so that only the contact pressure spring 15 is further pushed up and compressed. Then, at the time when the closed state is reached, the contact pressure at the point D shown in FIG. 3 is applied between the electrodes 4a and 5a, the closing operation is completed, and the closed state shown in FIG. 2A is obtained. .
When the proper contact pressure (wipe size) is reached, the driving operation force from the operation mechanism 22 is stopped, and the closing completion position is held by a latch mechanism (not shown) in the operation mechanism 22.

Next, the operation from the closed state to the open state will be described.
In the operation from the closed state to the open state, the operation is the reverse of the previous operation, and the insulating rod 17 is pushed downward by the compressed contact pressure spring 18 by removing the latch mechanism of the operation mechanism 22 (not shown). .
When passing through point B in FIG. 3, the spring force of the contact pressure spring 18 becomes equal to the final load of the open spring 15, so that the open spring 15 arranged in series also begins to be released, and the connecting rod 12 and the movable electrode bar 5 Both begin to move downward, the operation of the electrodes 4a and 5a to the open state begins.
When the point E is reached, the contact pressure spring 18 reaches the initial load position, and the connecting rod 12 and the insulating rod 17 shown in FIG. Further, the movable electrodes 5a are further separated from each other to complete the opening operation.

  At the initial stage of the closing operation, the insulating rod 17 is pushed downward in the figure by the contact pressure spring 18, and first, the lower surface of the nut 16 attached to the upper portion of the insulating rod 17 comes into contact (collision) with the inner chamber lower surface 12e. Thereafter, the insulating rod 17 and the connecting rod 12 are integrally moved to move downward in the figure to reach the open state.

  When the insulating rod 17 collides with the inner chamber 12c of the connecting rod 12 at the point E in FIG. 3, the impact force generated in the opening / closing process is maximized. For example, it is necessary to increase the size of the insulating rod 17 and the connecting rod 12 to increase the strength.

However, according to the first embodiment, when the insulating rod 17 and the connecting rod 12 collide, the insulating rod 17 that starts to move before the collision is at the speed V1, and the connecting rod 12 that starts moving from the point B is V2. Therefore, the difference between the two at the time of collision, that is, the relative speed obtained by subtracting the speed of V2 from V1. For this reason, the impact force generated at the time of a collision can be reduced by an amount corresponding to the speed ratio compared to the setting of the spring load in the conventional example, and the life can be extended without increasing the size of the insulating rod 17 and the connecting rod 12 and improving the strength. It becomes.
For example, if the velocity V1 of the insulating rod 17 at the time of collision is 2 m / s and the velocity V2 of the connecting rod 12 is 1 m / s, the insulating rod 17 collides with the connecting rod 12 in the structure of the first embodiment. In this case, the collision speed V = V1-V2 = 2 m / s-1 m / s = 1 m / s. However, as in the conventional case (the open spring and the contact pressure spring as shown in FIG. 3). When the speed immediately before the collision is V1 = 2 m / s, the connecting rod 12 has not yet started moving, so V2 = 0 m / s. Therefore, the collision speed V = V1-V2 = 2 m / s. Colliding with a speed of s-0 m / s = 2 m / s. An impact force corresponding to this speed is applied to the insulating rod 17 and the connecting rod 12.

Here, the link lever 20 is described as being supported by the insulating mold frame 1, but as shown in FIG. 4, the link lever 20 is supported by a carriage frame 31 that constitutes a casing together with the insulating mold frame 30. Also good.
Further, here, an example in which the direction of the driving force of the operation mechanism 22 is changed using the link lever 20 is described, but the present invention is not limited to this, and the operation mechanism 22 and the vacuum valve 2 can be connected without using the link lever 20. After arranging in a straight line, the operation mechanism 22 may be arranged so as to be on an extension line of the movable electrode rod 5, and the operation mechanism 22 may be connected so as to move the movable electrode rod 5 linearly.
Furthermore, in the present invention, the embodiments can be appropriately modified and omitted within the scope of the invention.

1 Insulated mold frame (frame)
2 Vacuum valve 2a Movable electrode guide 3 Vacuum vessel 4 Fixed electrode rod 4a Fixed electrode 5 Movable electrode rod 5a Movable electrode 6 Bolt 7 Upper terminal 8 Outer end of movable electrode 9 Flexible conductor 10 Lower terminal 12 Connecting rod 12a Connecting rod Trumpet-shaped spring seat 12b Through hole 12c Connecting rod inner chamber 12d Inner chamber upper surface 12e Inner chamber lower surface 13 Nut 14 Support plate 14a Annular ring 15 Release spring 16 Nut 17 Insulating rod 18 Contact pressure spring 20 Link lever 21 Link shaft 21a, 21b Support shaft 22 Operating mechanism 23 Link.
30 Insulation mold frame 31 Bogie frame (frame).

The open spring device in the conventional vacuum switchgear can be configured in a small size and at low cost by arranging a shaft array with respect to the contact pressure spring, reducing the load after touching the contact at the time of closing, and reducing the operating force of the operating mechanism. An opening / closing device is provided with an operating mechanism. Moreover, the corresponding order apparatus was large by reducing the stress generated by such increase the cross-sectional area of the insulator for the life of the opening and closing device.

The open spring of the conventional vacuum switchgear (Patent Document 1) is characterized in that the shaft is arranged in a skewered manner with respect to the contact pressure spring. The open spring length and the contact pressure spring are used as the movable part space of the switchgear. A space in the axial direction combined with the length is required, which is a limitation in configuring the switchgear in a small size.
Moreover, the to be a common problem for the life of the open closing device often is a durability of the insulating rod which is an integral part of the link lever. In order to solve this, it is necessary to take measures to increase the strength of the insulating rod or to reduce the external force applied to the insulating rod. To increase the strength of the former, it is conceivable to increase the cross-sectional area of the insulating rod, but this is in contradiction to the market demand for downsizing the switchgear due to the increase in size. In order to improve, it is advantageous to reduce the force applied to the insulating rod itself. However, in order to reduce the force applied to the insulating rod, generally, there is only a measure such as slowing the opening / closing speed, which also has a problem of being a trade-off with the current opening / closing performance.

The vacuum switchgear according to the present invention is provided on the outer end side of the movable electrode bar, provided on the outer end side of the movable electrode bar, and provided on the outer end side of the movable electrode bar. Since the open springs that are released when both electrodes are opened are constituted by springs having different winding diameters, and the open springs are arranged on the same axis of the movable electrode bar so as to surround the outside of the contact pressure springs. The vacuum switchgear itself can be made small and inexpensive, and it can fully meet the demand for longer life of the number of times of opening and closing, and the life of the switchgear can be extended.

Claims (4)

  A movable electrode having a fixed electrode rod that penetrates the vacuum vessel supported by the housing and has a fixed electrode at the inner end, and a movable electrode that penetrates the vacuum vessel so as to advance and retreat, and that is movable toward and away from the fixed electrode at the inner end. A vacuum valve provided with a rod, a contact pressure spring provided on the outer end side of the movable electrode rod and applying contact pressure between the electrodes when the electrodes are closed, and an outer end side of the movable electrode rod Provided with an open spring that releases when both electrodes are open, and the contact pressure spring and the open spring are composed of compression springs having different winding diameters, and the open spring is configured as the contact pressure. A vacuum switchgear characterized by being arranged on the same axis of the movable electrode bar so as to surround the outside of the spring.   A link lever which is supported by a housing in a swingable manner, has one end connected to an operating mechanism for operating the separating and moving operation of the fixed electrode and the movable electrode, and the other end linked to the outer end of the movable electrode rod. The contact pressure spring is stretched between the other end of the link lever and the outer end of the movable electrode rod, and the release spring is stretched between the outer end of the movable electrode rod and the housing. The vacuum switchgear according to claim 1, wherein the vacuum switchgear is installed.   A connecting rod connected to the outer end of the movable electrode rod to form an extension of the movable electrode rod, and inserted into the connecting rod so as to be movable in the axial direction and connected to the other end of the link lever and the connection An insulating rod linked to an outer end portion of the movable electrode rod via a rod; the contact pressure spring is stretched between the insulating rod and the connecting rod; and the release spring is connected to the connecting rod and the housing. The vacuum switchgear according to claim 1, wherein the vacuum switchgear is stretched between the fixed portions.   The maximum value of the spring acting force that the open spring applies to the movable electrode is set to be larger than the initial spring load that the contact pressure spring applies to the movable electrode. The vacuum switchgear according to item 1.

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