JPH07226321A - Gas insulated machine - Google Patents

Abstract

PURPOSE:To provide a gas insulated machine on which the temperature is detected by directly coming into contact with the insulating gas in a tank and a temperature sensing part can be substituted easily. CONSTITUTION:An outer cylinder 10 is provided is one body with a tank 1 filled with an insulating gas, the lower end of the outer cylinder 10 is covered by a slide cover 11 having the first gas hole 18 and a gasket 13. The slide cover 11 is energized upward by a spring 12, an inner cylinder 15, in which a temperature sensing part 16 is housed, is inserted into the outer cylinder 10 through the intermediary of an O-ring 14, so that the inner cylinder 15 presses the slide cover 11 downward as the bolt 7 remains screwed in.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas insulation device, which is capable of accurately measuring the temperature of insulation gas in a tank.

[0002]

2. Description of the Related Art Gas-insulated equipment is constructed by filling an insulating gas in a sealed tank and accommodating electrical equipment. Since the insulating gas is filled, it is necessary to constantly grasp the pressure and temperature in the tank and keep them in an appropriate state. Therefore, a temperature detecting device for measuring the temperature inside the tank from the outside is provided.

FIG. 3 shows a block diagram of a portion of a temperature detecting device in a conventional gas-insulated transformer. Tank 1 as shown
The mounting seat 3 is welded to the portion of the through hole 1a formed in the above, and the protective cylinder 2 integrated with the mounting seat 3 is inserted into the tank 1 through the through hole 1a. A mounting flange 5 is superposed on the mounting seat 3 via a gasket 6, and is joined by a bolt 7. Then, the temperature-sensitive cylinder 4 connected to a display unit (not shown) via the connecting pipe 8 is inserted into the protective cylinder 2 via the insertion hole 5a.

In the gas-insulated transformer having such a structure, the heat transferred from the insulating gas in the tank 1 to the air inside the protective cylinder 2 via the protective cylinder 2 is indirectly measured by the temperature sensitive cylinder 4. Become. Then, even if a defect occurs in the temperature sensitive tube 4, the temperature sensitive tube 4 can be replaced without leaking the insulating gas in the tank 1.

[0005]

However, since the protective cylinder 2 is greatly affected by the temperature of the mounting flange 5 and the mounting seat 3 which come into contact with the outside air, the temperature inside the protective cylinder 2 is the temperature inside the tank 1. Is different from. Moreover, since the heat in the tank 1 is transferred to the air in the protective cylinder 2 via the protective cylinder 2, there is a time lag between the temperature in the tank 1 and the measured temperature.

Therefore, an object of the present invention is to provide a gas-insulated device that solves the above problems.

[0007]

The structure of the present invention for achieving such an object is a gas-insulated device having a tank, an outer cylinder, a slide cover, an inner cylinder, and a temperature-sensing section. The tank is airtightly filled with insulating gas inside the tank, and the outer cylinder is airtightly fixed to the tank with the outer end opening to the outside of the tank, while the outer end is fixed to the inner end. Open to the inside of the tank, and the slide cover has a bottomed tubular shape and has a first gas hole near the bottom surface of the tubular portion, and is slidably covered on the inner end portion of the outer tube by an urging means. The inner cylinder is constantly pressed against the inner end surface of the outer cylinder, and the inner cylinder is airtightly inserted into the outer cylinder and has a second gas hole in the vicinity of the inner end, so that the inner cylinder is located inside the outer cylinder. It has a fixing means for fixing the inner end of the cylinder while protruding toward the inside of the tank. Temperature sensing unit is characterized in that it is accommodated in the inner tube hermetically against the outside of the tank.

[0008]

The insulating gas in the tank is introduced into the inner cylinder through the first gas hole and the second gas hole. Therefore, the insulating gas comes into direct contact with the temperature sensing portion, and the temperature measurement accuracy is high.

When the temperature sensing part fails, the inner cylinder together with the temperature sensing part is pulled out of the tank. Then, the slide cover closes the inner end of the outer cylinder by the urging force of the spring, and the insulating gas does not leak out of the tank. If the inner cylinder containing the new temperature-sensing portion is inserted into the outer cylinder and fixed by pressing the slide cover, the inside of the inner cylinder and the inside of the tank are connected again.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. Since the present embodiment is an improvement of a part of the conventional gas-insulated transformer, the same parts as those of the conventional one are designated by the same reference numerals, and the description thereof will be omitted. Only different parts will be described.

The construction of the gas-insulated transformer according to the present invention is shown in FIGS. As shown in the figure, the mounting seat 3 integrally welded to the tank 1 is integrally formed with a substantially cylindrical outer cylinder 10 extending toward the inside of the tank 1. Is provided with a large diameter portion 10a. A cylindrical bottomed slide cover 11 is slidably provided over the large-diameter portion 10a in order to close the inner end of the outer cylinder 10 that opens into the insulating gas. In order to hermetically close the inner end portion of the outer cylinder 10 by the slide cover 11, the gasket 13 is housed in the circumferential groove formed on the bottom surface of the slide cover 11, and when the slide cover 11 moves slightly downward, the outer cylinder 10 Four first gas holes 18 are formed at equal intervals in the circumferential direction in the vicinity of the bottom surface of the cylindrical portion of the slide cover 11 so that the inside and the outside communicate with each other.

In addition, means for constantly pressing the slide cover 11 toward the end surface of the large diameter portion 10a is provided. That is, the flange portion 11a is formed on the outer periphery of the bottom portion of the slide cover 11, while the cylindrical portion 3a is formed on the end surface of the mounting seat 3.
Is formed, and one end of the spring 12 is engaged with the flange portion 11a and the other end is fitted inside the cylindrical portion 3a.

An inner cylinder 15 is hermetically housed inside the outer cylinder 10 via an O-ring 14. The inner cylinder 15 has a bottomed cylindrical shape, and the outer end portion is integrally formed with the mounting flange 5. Then, a hole 5 a for inserting a temperature-sensitive portion 16 described later into the inner cylinder 15 is formed in the mounting flange 5. Four second gas holes 17 are formed in the cylindrical portion of the inner cylinder 15 near the bottom surface at equal intervals in the circumferential direction. The length of the inner cylinder 15 is set longer than the distance between the lower end of the outer cylinder 10 and the upper surface of the mounting seat 3, and the gasket 6 is sandwiched between the mounting flange 5 and the mounting seat 3 to serve as a fixing means. By tightening the bolt 7, the slide cover 11 is pushed downward against the biasing force of the spring 12, and the inside of the inner cylinder 15 communicates with the inside of the tank 1 through the first gas hole 18 and the second gas hole 17. . In this way, the pipe 19 is airtightly inserted into the inner cylinder 15 communicating with the inside of the tank 1.
The temperature sensing portion 16 is attached to the tip of the. Temperature sensor 16
Is connected to the display unit via a cable (not shown) in the pipe 19 and the communication pipe 8.

Next, the operation of such a gas insulated transformer will be described. When the mounting flange 5 and the mounting seat 3 are connected by the bolt 7, the inner cylinder 15 maintains the state where the slide cover 11 is slightly pushed downward, and the insulating gas in the tank 1 is connected to the first gas hole 18 and Large diameter part 10a and gasket 13
Through the second gas hole 17 and into the inner cylinder 15. Therefore, the insulating gas is transferred to the temperature sensing portion 16 in the inner cylinder 15.
As a result, the temperature of the insulating gas measured is displayed on the display unit via a cable (not shown).
Since the O-ring 14 and the gasket 6 are interposed between the outer cylinder 10 and the inner cylinder 15 and the pipe 19 and the mounting flange 5 are airtightly held, the inner cylinder 10 or the tank 1
Air outside the tank does not enter the inside of the.

When the temperature sensing portion 16 fails for some reason, the bolt 7 is removed and the mounting flange 5 and the inner cylinder 15 are pulled upward. Then, as the inner cylinder 15 rises, the slide cover 11 rises due to the urging force of the spring 12, and hits the large diameter portion 10a to stop, as shown in FIG. Then, the gap between the large diameter portion 10a and the slide cover 11 is kept airtight by the gasket 13, so that even if the inner cylinder 15 is pulled out from the outer cylinder 10, the insulating gas in the tank 1 passes through the inside of the outer cylinder 10. Therefore, there is no possibility that it will be discharged to the outside of the tank 1.

Next, after removing the old temperature sensing part 16 from the inner cylinder 15 and attaching the new temperature sensing part 16, the inner cylinder 15 is inserted into the outer cylinder 10 to some extent. And the outside of the tank 1 are completely cut off. Therefore, by pushing the lower end of the inner cylinder 15 downward, the slide cover 11 is separated from the large-diameter portion 10a, and the tank 1
Even if the inside of the tank communicates with the inside of the inner cylinder 15, the insulating gas in the tank 1 does not leak to the outside of the tank 1. After that, when the bolt 7 is tightened, the state shown in FIG. 1 is obtained. With the above, the replacement of the temperature sensing unit 16 is completed.

Although this embodiment shows the case where the present invention is applied to a gas-insulated transformer, the present invention is not limited to the gas-insulated transformer.

[0018]

As can be seen from the above description, according to the gas insulation device of the present invention, the insulating gas in the tank is introduced into the inner cylinder through the first gas hole and the second gas hole. When the temperature part is in direct contact with the insulating gas in the tank, the temperature measurement accuracy is higher than before, and when the temperature in the tank changes, the time lag as in the past does not occur.

Further, when the inner cylinder is pulled out from the outer cylinder, the slide cover is pressed against the end surface of the outer cylinder by the urging force of the spring. Therefore, when the temperature sensing portion is replaced, the insulating gas in the tank is inside the outer cylinder. It does not leak out of the tank via.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a main part of a gas insulation transformer as an embodiment of the present invention.

FIG. 2 is an explanatory view showing a gas-insulated transformer according to an embodiment of the present invention and showing a state in which an inner cylinder is removed.

FIG. 3 is a configuration diagram of a main part of a conventional gas-insulated transformer.

[Explanation of symbols]

 1 ... Tank 5 ... Mounting flange 7 ... Bolt 10 ... Outer cylinder 11 ... Slide cover 12 ... Spring 13 ... Gasket 14 ... O-ring 15 ... Inner cylinder 16 ... Temperature sensing part 17 ... Second gas hole 18 ... First gas hole

Claims (1)

[Claims] 1. A tank, an outer cylinder, a slide cover,
A gas-insulated device having an inner cylinder and a temperature-sensing part, wherein the tank is configured to be airtight by filling the inside of the tank with insulating gas, and the outer cylinder has an outer end outside the tank. While it is airtightly fixed to the tank in the open state, the inner end opens to the inside of the tank, and the slide cover has a bottomed tubular shape and has a first gas hole near the bottom surface of the tubular portion, It is slidably mounted on the inner end of the cylinder, and is constantly pressed against the inner end surface of the outer cylinder by the urging means. The inner cylinder is airtightly inserted inside the outer cylinder and close to the inner end near the inner end. It has two gas holes and has fixing means for fixing the inner end portion of the inner cylinder more than the inner end portion of the outer cylinder so as to project toward the inside of the tank. A gas-insulated device that is hermetically housed inside the inner cylinder.