JPS6349848B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a detection device that detects a failure inside a gas-sealed container that houses an electrical equipment main body by using a contact pressure response.

A conventional device of this type is shown in FIG.

In the figure, 1 is a first container that houses an electrical equipment body and is sealed with gas 101, 2 is a second container that is attached to the first container 1 and is sealed with gas 101, and 3 is a second container 2. 4 is a flange attached to the open end of bellows 3; 5 is a built-in bellows;
is a vent between the interior of the bellows 3 and the gas 101 of the first container 1, 6 is a bottom plate of the bellows 3, 7 is a pivot fixed to the bottom plate 6, 8 is a micro switch, 81
is a movable contact of micro switch 8 (not shown)
9 is an operating plate interposed between the pivot 7 and the button 81 of the micro switch 8 and rotatably supported at a support point 91; 92 is a support point 91;
One end is connected to the operating plate 9 on the opposite side to the button 81, and the other end is connected to the mounting plate 10 of the micro switch 8.
11 is a guide rod fixed to the center of the bellows bottom plate 6 and having a ventilation hole 5 at its tip;
12 is a dividing plate that separates the first container 1 and the second container 2; 13 is a connecting pipe that connects the flange 4 and the dividing plate 12; a tapered screw is machined at the tip, and the connecting pipe is screwed into the dividing plate 12; It is worn.

14 is fixed to the inner wall of the connecting pipe 13 so that the pressure of the gas 101 in the bellows 3 increases the pressure of the gas 101 in the second container 2.
15 is a ring that prevents the indoor rod 11 from moving more than a predetermined amount when the pressure becomes lower than the pressure of the bellows 3; 15 is a bottom plate when the pressure of the gas 101 in the bellows 3 becomes higher than the pressure of the gas 101 in the second container 2; 6 is a stop plate that prevents movement beyond a predetermined value, 16 is a flange 4 and a stop plate 15
An adjustment rod 17 has threads machined on both ends and is screwed onto the flange 4 in order to adjust the distance between the first container 1
18 is a sealed terminal attached to the second container 2; 19 is an internal lead wire that electrically connects the micro switch 8 and the sealed terminal 18; 20 is an external lead wire.

Next, the operation will be explained. If a short-circuit accident occurs between the electrical equipment main body (not shown) of the electrical equipment housed in the first container 1 or between the electrical equipment, the gas 101 may be decomposed by the arc energy. The pressure in the first container 1 increases rapidly due to thermal expansion, resulting in a collisional pressure wave. This pressure increase inside the first container 1 is caused by the throttle hole 17.
This creates a pressure difference between the pressure in the first container 1 and the pressure in the second container 2, which was equal to the pressure in the first container 1 before the accident. The second container 2
The pressure increase inside the first container 1 can be considered to be almost zero, and the gas 101 whose pressure has increased inside the first container 1 flows through the electrical section 5 to the bellows 3 as shown by the broken line arrow in FIG.
This causes the pressure inside the bellows 3 to rise. Therefore, the bottom plate 6 of the bellows 3 is pushed up, and the button 81 of the micro switch 8 is pushed up via the pivot 7 and the operating plate 9.
, and close the contacts (not shown) of the micro switch 8 to connect the internal lead wire 19 and the external lead wire 2.
An alarm command is issued through 0, and the power supply to the electrical device that has experienced an internal failure is cut off, thereby disconnecting the electrical device from the main circuit.

In the event of an internal accident of such equipment, the first container 1
It is unavoidable that it takes a long time to exhaust the gas 101 inside, disassemble the first container 1, inspect and repair the internal equipment, evacuate it, and fill in new gas 101.

However, in order to replace even if any of the devices housed in the second container 2 breaks down, it is necessary to remove not only the gas 101 in the second container 2 but also the gas 101 in the first container 1, which has no abnormality. The disadvantage is that it takes a long time to exhaust the gas 101 as well.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and when the equipment in the second container, including the micro switch, breaks down, the second container can be quickly removed and the first container can be replaced. The purpose is to automatically close the discharge port of the first container in order to limit the release of gas into the atmosphere to a negligible extent, and to restore the normal state in a short time by attaching a normal second container. It is said that

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

FIG. 2 is a sectional view showing an embodiment of the present invention. Components having the same reference numerals as those in FIG. 1 indicate the same or corresponding parts, and therefore their explanation will be omitted. 21 is the second container 2
is attached to the first container 1 together with the dividing plate 12, 22 is a flat plate attached to the first container 1 with bolts 23, 24 is a flat spring attached to the flat plate 22 with bolts 25, and 26 is a flat spring 24. 27 is a cylindrical comb-shaped opening at the lower end of the connecting tube 13;
28, 29, and 30 are O-rings.

The operation is such that when the second container 2 and the dividing plate 12 are attached to the first container 1, the bolt 21 is tightened, and the connecting pipe 13 fixed to the dividing plate 12 moves downward, so that the lower end is connected to the flat spring 24. The spring force and the pressure difference between the gas 101 in the first container 1 and the second container 2 push the lid 26 open and open the opening 27 in the first container.
The gas 101 in the container 1 and the gas 10 in the bellows 3
1 through a connecting pipe 13.

If, for example, the micro switch 8 in the second container 2 breaks down, there is a method to provide a top cover on the second container 2, open it, close the aperture hole 17, take out the micro switch 8 together with the mounting plate 10, and replace it. bellow 3 of micro switch 8 on top of the
It is not practical to replace the actuating plate 9 alone because it requires adjustment in combination with the actuating plate 9 and the like. Therefore, it is possible to replace the entire second container, which has been adjusted in advance, in a short period of time, and there is an advantage that reliability can be greatly improved.

In the above embodiment, the lid 26 was provided in order not to increase the spring force of the flat plate 24 and the strength of the bolt 25 more than necessary, but the flat plate 22 was used instead of the lid 26 and the round hole in the center and the bolt 23 were omitted. Needless to say, a stronger flat spring 24 may be attached to the wall of the first container 1 by a stronger bolt 25, and the flat plate 22 may function as the lid 26.

Also, in another embodiment, a helical spring can be used instead of the flat spring 24.

This invention also has the advantage that the main circuit can be replaced with a live circuit depending on the mounting position of the detector.

As described above, according to the present invention, in the event of an accident not caused by a short circuit in the main body of an electrical device, but in a detection device containing a micro switch, bellows, orifice, etc., the container containing the entire detection device can be removed. If a normal detection device is installed to automatically close the opening inside the main container to the outside and prevent the release of internal gas, the original normal state can be automatically restored in a short time and reliability can be improved. effective.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional detection device, and FIG. 2 is a sectional view of a detection device according to an embodiment of the present invention. In the figure, 1 is the first container, 2 is the second container, 3
5 is a bellows, 5 is a vent, 6 is a bottom plate, 8 is a micro switch, 17 is an opening, and 26 is a lid. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A first container that houses an electrical equipment body and is sealed against gas, a sealed second container that is detachably fixed to the first container, and a sealed second container that is stored in the second container and has one end sealed. a bellows fixed to the second container, one end of which is in close communication with the other end of the bellows to communicate with the interior of the bellows, and the second container is fixed to the first container; When the other end is connected to the first container through an opening provided in the first container.
a communication pipe capable of communicating with the inside of the container, the first container being provided with a biasing force so as to always close the opening provided in the first container; When fixed to the first container, the other end of the communication tube is pressed against the urging force to unblock the opening of the first container and connect the communication tube and the inside of the first container. An internal failure detection device for an electrical device, comprising: a lid for communicating with the second container; and a microswitch that is housed in the second container and is opened and closed by displacement of one end of the bellows to detect a failure inside the first container.