JPS5820444B2 - Vacuum cutting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vacuum breaker, and particularly to the structure of a movable operating part of a vacuum breaker.

An object of the present invention is to provide a pair of guide rods in parallel on the operation side of a vacuum breaker, to interpose a roller between these guide rods, to provide a guide frame for a movable rod on the roller, and to link the guide frame to the guide frame. The purpose of the present invention is to provide a vacuum breaker with smooth operation and high performance by connecting mechanisms.

The present invention provides a vacuum breaker that converts the movement of one operating rod into a movement in an approximately right angle direction via a link mechanism to perform closing and closing operations of a movable contact, and is capable of moving a predetermined distance from the vicinity of the movable side end plate. It is characterized by supporting the movable rond at other points, and by interposing rollers within the link mechanism to facilitate smooth operation.

Embodiments of the present invention will be described below with reference to FIGS. 1 to 5.

In the figure, 1 is a support insulator, and this support insulator 1 has T
A type conductive case 2 is placed thereon.

A breaker insulator tube 4a is connected to one of the 7 langes 2a of the case 2 via a metal ring 3, and a breaker insulator 4b is attached to the other 7 langes 2b.

A vacuum breaker 6 is housed in the insulators 4a and 4b so that the movable rod 27 is arranged in a straight line.

An insulating rod 7 connected to an operating section (not shown) is inserted into the support insulator tube 1, and a sliding shaft 7a connected to the tip of this insulating rod 7 is inserted into a bearing 8, An operating rod 25 is formed by the rod 7 and the sliding shaft 7a.

At the tip of the sliding shaft 7a, there is a link 9a as shown in FIG.
, 9b are pivotally connected by a pin 1°0.

In the vacuum breaker of this embodiment, as shown in FIG. The movable end plate and the insulator tube 4a (4b)
) and the flange 2a (2b) of the case 2.

The movable lead 5 is inserted through the sliding contact 11 of the bearing frame 13 and connected to the movable rod 27.

A guide frame 14 is slidably fitted to the other end of the movable rod 27, and a locking member 15 serving as a stopper is attached to the end of the movable rod 27.

Inside the case 2, as shown in FIGS. 4 and 5, a pair of upper and lower guide rods 16a are installed between the seven lunges 2a and 2b.
, 16b and 16a, 16b are bridged, and a pair of left and right rollers 18a, 18b are pivotally connected to the guide frame 14 via a pivot pin 17 connected to the link 9a (9b).

As shown in FIG. 5, the rollers 18a and 18b have round grooves 19 on their outer peripheries, and the guide rods 16a and 16b have round grooves 1
9 is fitted.

In the drawings, reference numeral 20 indicates a pressure contact spring inserted into the movable rod 27 and elastically mounted between the guide frame 14 and the spring receiver 21, 22 a movable contact, 23 a fixed contact, and 24 a bellows.

Next, the operation of the vacuum breaker of this embodiment will be explained.

In the cut-off state shown in FIG.
When pushed upward (as shown by arrow 26a), links 9a and 9b rotate about pin 10 in a direction in which they are separated from each other.

The rotation of the links 9a and 9b moves the guide frame 14 toward the vacuum breaker 6, and the spring force of the pressure spring 20 causes the movable lead 5 to slide within the sliding contact 11.
The movable rod 27 connected to the movable lead 5 is connected to the guide frame 14.
The movable contact 22 is inserted into the fixed contact 23 by sliding inside the movable contact 22.
It is connected to the input state shown in Fig. 2.

In this case, the movable rod 27 connected to the movable lead 5
are the sliding contact 11 of the bearing frame 13 and the guide rod 16a.
, 16b and roller 18a.

It is supported at two points with a relatively large distance from the guide frame 14 via the guide frame 18b, and the guide frame 14 is supported by the roller 1.
The guide frame 14 is configured to move only in the axial direction with the guide rods 16a and 16b via the guide rods 8a and 18b.
There is no vibration of the movable lead 5 and the movable rod 27, and the vibration of the movable contact 22 is eliminated.

Therefore, the movable contact 22 can always be brought into concentric contact with the fixed contact 23, and the contact state between the contacts can be improved.

Further, the operation rod 25 is operated by the roller 18a.

Since the movable lead 5 is turned on and off by the rolling action of the movable lead 5, the operating resistance is small, and the operating force of the operating section is small.

Next, in the closed state shown in FIG. 2, when the operating rod 25 is pulled down in the direction of the arrow 26b, the links 9a and 9b rotate in the direction opposite to each other, and the guide rod 14 moves toward the guide rods 16a and 16b. The movable lead 5 slides while being guided by the rollers 18a and 18b, and moves to the cutoff state shown in FIG.

6 to 8 show other embodiments in which the present invention is applied to a vacuum breaker formed in an L shape, and in this embodiment, a conductive case 2 having an L-shaped cross section is connected to a supporting insulator tube 1. , in which the breaker section insulator pipe 4a in which the vacuum breaker 6 is housed is connected to the flange 7a of this case, the guide rod 16
a and 16b are installed as bridges between the flange 2'a of the case 2 and the inner wall.

Incidentally, FIG. 6 shows a cut-off state, and FIG. 7 shows a closed state, and the same effects as those of the above-mentioned embodiments are achieved.

FIG. 8 shows still another embodiment, in which the guide frame 14 is slidably fitted to the tip of the movable rod 27, and the guide frame 14 is fitted to the inner wall of the case 1 facing the tip of the movable rod 27. The stopper is constructed by accommodating a member 28.

According to this embodiment, since the stopper member 28 is provided, it is possible to prevent overtravel of the movable contact, prevent re-ignition between the movable and fixed contacts, and prevent the bellows 24 from overtravelling.
The following describes the same effects as those of the embodiments described above, in which the vacuum breaker can be prevented from being excessively compressed, thereby improving the performance and reliability of the vacuum breaker.

As is clear from the above description, the present invention provides a device in which a breaker insulator housing a vacuum breaker is installed on a support insulator through which an operating rod is inserted, and the movable lead of the vacuum breaker is opened and closed by the operating rod. , a bearing frame for the movable rod is provided on the movable side of the vacuum breaker, the bearing frame and a guide frame provided at the tip of the movable rod support the movable rod, and the guide frame is mounted on the roller. Since the slide is caused by rolling, the link mechanism is simplified, the operating force can be reduced, and the operating section can be made smaller.

[Brief explanation of the drawing]

The drawings relate to a vacuum breaker according to an embodiment of the present invention, in which FIG. 1 is a partially longitudinal front view showing the cut-off state, FIG. 2 is a partially longitudinal front view showing the closed state, and FIG. 3 is a partially longitudinal front view showing the closed state. A-
4 is a sectional view taken along line B-B in FIG. 2, FIG. 5 is a perspective view of the roller used in the present invention, FIGS. 6 and 7 show other embodiments, and FIG. 7 is a partially longitudinal front view showing the closed state, FIG. 7 is a partially longitudinal front view showing the closed state, and FIG. 8 is a front sectional view showing the main part of another embodiment. 1... Support insulator pipe, 4a, 4b... Breaker part insulator pipe,
5... Movable lead, 6... Vacuum breaker, 9a, 9
b... Link, 11... Bearing portion, 13... Bearing frame, 14... Guide frame, 15... Nut, 16a, 16
b...Guide rod, 18a, 18b...Roller, 25
...Operating rod, 27...Movable rod.

Claims (1)

[Scope of Claims] 1. At least one breaker insulator tube housing a vacuum breaker on a support insulator through which an operating rod is inserted is arranged at right angles through a case, and the operating rod is connected to the vacuum breaker via a link mechanism. The movable lead 5 has a sliding contact 11 at one end that slidably supports the movable lead 5, and the movable lead 5 is connected to a bearing frame 13 whose other end is open. A guide frame 14 that is slidably fitted to the rod 27 is provided on the movable side of the vacuum breaker 6, and a pivot pin that is perpendicular to the operating direction of the operating rod 25 and protrudes in both directions is provided on the guide frame 14. 17, and rows 218a and 18b are provided at both ends of the pivot pin 17, respectively.
The roller 18a is rotatably mounted inside the case 2. Two pairs of guide rods 1 each rotatably holding the 18b.
6a and 16b are fixedly installed.