JPS61189105A - Gas insulated switch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention primarily relates to an improvement in the drive mechanism of a gas insulated earthing switch.

[Conventional technology]

Figure 2 is a sectional view showing an example of a gas-insulated three-phase two-circuit earthing switch, which is a conventional switch of this type, and is fixed in a sealed cylindrical container 1 filled with insulating gas to a predetermined pressure. A contactor 2 and a movable contactor 3 are provided opposite the contactor 2, and are operated by an operating shaft 5 that is airtightly introduced from an external operating device (not shown) through a sealed bearing 4 attached to the container 1. A drive plate 8 made of an insulating plate is driven via a lever 6 and a link 7, and opening and closing operations of the movable contact 3 attached to the drive plate 8 with respect to the fixed contact 2 are performed in a batch operation.

Here, the sliding contact 9 provided on each movable contact 3 is fixed to a common supplement made of an insulator to a plate lO, and is attached to a bushing conductor 13 of each insulating bushing 12 fixed to a lid plate 11 of the container. , are attached via connecting conductors 14, respectively. That is, each sliding contactor 9 is fixed to the plate io at a common attachment point, is firmly held as one body to the bushing conductor 13, and is electrically connected to the bushing conductor 13, respectively. Note that 15 is a shield for the sliding contact 9;
6 is a guide rod of the driving plate 8.

(Problems to be Solved by the Invention) As described above, since the bearing 4 of the operating shaft was conventionally attached to the container wall, it was necessary to perform work such as welding the bearing block on the container l and precision machining of the shaft hole. However, since the container is large, precision machining, especially in the horizontal direction, requires a large machine tool such as a large machining center.Also, the container is quite heavy, and transporting it requires heavy-duty transportation equipment. In addition,
When a branch pipe or the like is provided on the side of the container 1, it is necessary to avoid the bearing 4, which limits the position of the branch pipe, resulting in a drawback that the container becomes larger.

[Means for solving problems]

The present invention was made to eliminate these drawbacks.
The bearing 4, which was conventionally attached to the container l, is now installed on the lid plate of the container. In this way, the lid plate is much smaller and lighter than the container, and processing for mounting the bearing can be performed extremely easily.

〔Example〕

FIGS. 1(a), (b), and (C) are a longitudinal cross-sectional view, a cross-sectional view taken along cutting line A-A, and a side view showing a closed circuit state of an embodiment of the present invention.

Here, as in the case of FIG. 2, the sliding contact 9 provided on each movable contact 3 is fixed to a common mounting plate 10 made of an insulator, and also fixed to the lid plate 1'l of the container. Each sliding contact 9 is attached to the bushing conductor 13 of each insulating bushing 12 via a connecting conductor 14, and each sliding contact 9 is fixed to a common mounting plate lO and integrally connected to the bushing conductor 13.
The bushing conductor 1
3. Note that 15 is a shield that covers the sliding contact 9, 16 is a guide rod that holds the drive plate 8, and 17 is a guide rod that holds the drive plate 8.
and 18 are through holes and cutouts for movable contacts provided in the drive plate 8.

In this case, the operating shaft 5 is introduced into the container l via a bearing 21 of a sealed structure attached to the lid plate 11 of the container. The bearing 21 is provided with a receiving metal 22 and a sealing material 23 to have an airtight structure, and the operating shaft 5 is connected to the operating lever 6 by changing its rotation direction by 90 degrees via a lever 24 and a link 25.
is operated to bring the movable contact 3 into and out of contact with the fixed contact 2 in a batch operation. Note that 26 is the shaft 2 of the operating lever 6.
7 is a support plate fixed to the cover plate 11.

〔Effect of the invention〕

As described above, in the present invention, the bearing of the operating shaft for driving the movable contact, which was conventionally attached to the container wall, is provided on the lid plate, so there is no need to process the container itself, which is large and heavy as in the past. Instead, only a small and lightweight lid plate is processed, and the labor and time for processing can be significantly reduced.

Further, the entire device including the movable contacts and the operating shaft can be assembled on the cover plate externally in advance, and the completed device can be attached to the container I, making it possible to easily assemble the device.

Although the present invention was made with the intention of improving gas insulated grounding switches, it is not limited to particular grounding switches and can be used as a general gas insulated switch.

[Brief explanation of drawings]

FIGS. 1(a), (b), and (e) are longitudinal sectional views showing an embodiment of the gas-insulated earthing switch according to the present invention, along the cutting line A-A.
FIG. 2 is a sectional view showing a conventional example. l... Container, 2... Fixed contact, 3... Movable contact, 5... Operating shaft, 6... Operating lever, 7... Link, 21... Bearing. Talent I Illustration

Claims (1)

[Claims] A bearing with a sealed structure is provided on the lid plate of a container that houses a fixed contact, a movable contact, a lever and a link mechanism for driving the movable contact, and is filled with insulating gas to a predetermined pressure, and drives the lever and link mechanism. A gas insulated switch characterized in that an operating shaft is introduced into the container via the bearing.