JP2004064900A - Gas-insulated switchgear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that the number of part items is increased when an operating rotating shaft and a direct acting rod are inserted to a tank filled with insulation gas via an O-ring. <P>SOLUTION: Disconnectors 19a to 19c are accommodated in the tank 18 filled with the insulation gas, a drive unit 21 arranged outside the tank 18 is communicatively coupled to the tank via the direct acting rod 23 that reciprocates in the axial direction, and the direct acting rod 23 is formed with an opening 20a that airtightly penetrate the rod via a bellows 32. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a gas insulated switchgear, and has an improved seal structure at a portion through which a linear motion rod passes.
[0002]
[Prior art]
FIG. 4 shows the configuration of the gas insulated switchgear. The inside of the gas insulated switchgear includes a load bus chamber 1 filled with insulating gas, a breaker room 2 filled with insulating gas, and a power cable room 3 in the air. The load bus room 1 accommodates a load bus 10 and a disconnector (DS) 4. The circuit breaker room 2 accommodates a circuit breaker (VCB) 5, a disconnecting switch (DS) 6, a ground switch (ES) 7, and a lightning arrester (LA) 8. The power cable room 3 houses a cable head (CHD) 9 and a power cable 11.
[0003]
FIG. 5 shows the configuration of the disconnector 4 in such a gas insulated switchgear. The driving force from the driving unit 4a is converted into reciprocating rotation of the through shaft 4b and transmitted to the disconnecting unit 4c, so that the three-phase movable rod 4d reciprocates, and the main circuit is disconnected or connected in the disconnecting unit 4c. It has become.
[0004]
Here, the penetrating shaft 4b hermetically penetrates a tank 4f filled with insulating gas via an O-ring 4g, and the penetrating shaft 4b is rotatably supported via a pair of bearings 4e.
[0005]
However, since two types of parts, a seal member and a bearing, are required, the number of parts is large and the cost is high.
[0006]
For this reason, as shown in FIG. 6, it is also conceivable to adopt a configuration in which the disconnecting portion is operated via a linearly movable rod 13 which can reciprocate through the tank 12. Also in this case, two types of parts, a seal member and a bearing, are necessary, and an O-ring 14 and a pair of bearing members 15 are provided as shown in the figure.
[0007]
[Problems to be solved by the invention]
However, when a linear motion rod is used, there is a problem in that if the amount of compression of the O-ring is increased, the resistance to the movement of the linear motion rod increases, and if the compression amount is reduced, gas leakage occurs. Further, since the linear motion rod moves in the axial direction, there is also a problem that the O-ring is damaged due to biting of dust and gas leakage occurs.
[0008]
Therefore, an object of the present invention is to provide a gas insulated switchgear that solves the above problem.
[0009]
[Means for Solving the Problems]
In order to achieve such an object, the configuration of the gas insulated switchgear according to claim 1 accommodates a disconnecting portion inside a container filled with an insulating gas, while providing a driving unit outside the container, In a gas insulated switchgear in which a driving unit is operatively connected to the disconnecting unit, a linear motion rod is passed through an opening of the container through a bellows in an airtight manner, and the drive is performed through the linear motion rod that reciprocates in the axial direction. A portion is interlockedly connected to the disconnecting portion.
[0010]
Since the linear motion rod penetrates through the opening of the container through the bellows, the number of components can be reduced as compared with the case where the rotation shaft and the linear motion rod penetrate through the O-ring.
[0011]
In the configuration of the gas insulated switchgear according to claim 2, in claim 1, the bellows is connected to one end of the bellows in the opening while the bellows enters the inside of the container, and the other end is connected to the bellows. It is characterized by being connected to the linear motion rod.
[0012]
Since the bellows is arranged in a state where the bellows has entered the inside of the container, the bellows is constantly pressed from the outside to the inside of the bellows. For this reason, there is no possibility of buckling of the bellows.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the gas insulated switchgear according to the present invention will be described.
[0014]
(A) Embodiment 1
First, Embodiment 1 is shown in FIG. Disconnect portions 19 a to 9 c are accommodated in a tank (container) 18 filled with an insulating gas, and an inlet of the tank 18 is closed by a lid 20. A driving unit 21 is provided outside the tank 18. An arm 22 is fixed to an output shaft 21 a of the drive unit 21, and one end of a linear motion rod 23 is rotatably connected to an end of the arm 22. Adjustment means 23 a for adjusting the length of the linear motion rod 23 is provided at an intermediate portion of the linear motion rod 23. The translation rod 23 is inserted through a hole (opening) 20 a of the lid 20.
[0015]
On the other hand, a connection shaft 25 is rotatably provided inside the tank 18 via a pair of support members 24, and the end of the linear motion rod 23 is turned on the end of an arm 26 fixed to the connection shaft 25. They are freely connected. Three pairs of arms 27 are fixed to the connection shaft 25, and pins 27a provided so as to bridge between the arms 27 are loosely fitted in long holes 28a of a slide member 28 which can reciprocate in the left-right direction. Each slide member 28 is connected to a movable rod 29.
[0016]
The structure of the portion where the linear motion rod 23 passes through the lid 20 will be described below. An auxiliary plate 30 having a hole having substantially the same size as the hole 20 a is air-tightly attached to the lid 20, while an end plate 31 is fixed to the linear motion rod 23. One end of the bellows-shaped bellows 32 is air-tightly connected to the linear motion rod 23 via the end plate 31, and the other end is air-tightly connected to the lid 20 via the auxiliary plate 30.
[0017]
The operation of such a gas insulated switchgear will be described. By reciprocating the output shaft 21a of the drive unit 21, the arm 22 reciprocates and occupies the "off" and "on" positions. At this time, the pair of levers 27 also rotate to occupy the “OFF” and “ON” positions in the figure, and the movable rod 29 occupies the connection / disconnection position.
[0018]
The operation of the disconnector configured as shown in FIG. 1 will be described with reference to FIG. Since the distal ends of the arms 22 and 26 perform an arc movement, the linear motion rod 23 connecting the distal ends of the arms 22 and 26 does not linearly move along the axis of the linear motion rod 23, As shown in FIG. Since the bellows 32 allows the translation rod 23 to move in the radial direction, the end plate 31 also moves in an arc as shown in the figure. That is, since the distal ends of the arms 22 and 26 make an arc movement, the linear motion rod 23 is not a complete linear movement but a linear movement including a vertical swing in FIG. 1B.
[0019]
Further, since the inside of the tank 18 is filled with the insulating gas and the pressure is higher than the outside atmospheric pressure, the substantially cylindrical bellows 32 is constantly pressed from inside to outside.
[0020]
(B) Embodiment 2
Next, a second embodiment is shown in FIG. Since this embodiment is a modification of the first embodiment, only different parts will be described.
[0021]
As can be seen by comparing FIGS. 1 and 3, in the second embodiment, the bellows 32 is arranged inside the tank 18. For this reason, the size of the hole 20 a of the lid 20 is formed larger than the outer size of the bellows 32. Then, the pressure on the outside of the bellows 32 is larger than the pressure on the inside.
[0022]
Bellows are apt to buckle when the pressure inside and outside is the same or when the pressure inside is high, and therefore it is unsuitable to use the bellows for a linear rod that reciprocates linearly. When the inside of the bellows has a high pressure as described above, it is necessary to provide a support member on the bellows in order to expand and contract while preventing buckling.
[0023]
On the other hand, in the gas insulated switchgear of FIG. 3, since the pressure on the outside of the bellows 32 is larger than the pressure on the inside, the bellows 32 has no possibility of causing a buckling phenomenon.
[0024]
In the configuration in which the rotating shaft is passed through the tank in an airtight manner as shown in FIG. 5, eight parts (rod + arm + rotating shaft + arm + rod) + (a pair of bearings + seal member) are required. On the other hand, six parts of (arm + rod + arm) + (bellows + auxiliary plate + end plate) are sufficient, and the moving parts are reduced, so that the operation accuracy is improved.
[0025]
In addition, since the bellows 32 is located inside the tank 18, the size of the disconnector can be reduced, and the thin and easily damaged bellows 32 can be prevented from being damaged.
[0026]
Other configurations and operations are the same as those of the first embodiment, and therefore, description thereof will be omitted.
[0027]
【The invention's effect】
As can be seen from the above description, according to the gas insulated switchgear according to the first aspect, since the direct-acting rod is passed through the opening of the container in a gas-tight manner through the bellows, the O-ring is inserted through the opening of the container. The number of components is reduced compared to a configuration in which the rotating shaft is penetrated airtightly or a configuration in which a linear rod that reciprocates in the axial direction is airtightly penetrated through the opening of the container via an O-ring. Since the man-hour is reduced, the manufacturing cost is reduced. Further, the linear motion rod oscillates in a direction perpendicular to the axis. However, since the bellows follow this oscillation, no problem occurs. Further, when an O-ring is used between the linear motion rod and the container, dust may be caught and the O-ring may be damaged to cause gas leakage, but such a problem does not occur.
[0028]
According to the gas insulated switchgear according to the second aspect, since the bellows is disposed inside the container, gas pressure is applied from the outside to the inside of the bellows, and the buckling phenomenon does not occur in the bellows. In addition, the bellows can be reduced in size by the amount of the bellows as compared with the case where the bellows is arranged outside the container, and the bellows is protected inside the container, so that the bellows is less likely to be damaged.
[Brief description of the drawings]
FIG. 1 is a plan view of a gas-insulated switchgear according to a first embodiment of the present invention, in which FIG.
FIG. 2 is an explanatory diagram showing the operation of the gas insulated switchgear according to the first embodiment of the present invention.
3 (a) is a plan view and FIG. 3 (b) is a front view of a main part of a gas insulated switchgear according to a second embodiment of the present invention.
FIG. 4 is a configuration diagram of a gas insulated switchgear.
FIG. 5 is a plan view and FIG. 5B is a front view of a main part of a conventional gas insulated switchgear.
FIG. 6 is a sectional view showing an improvement plan of a main part of the gas insulated switchgear.
[Explanation of symbols]
18 tanks 19a to 19c disconnecting part 20a opening 21 driving part 23 linear rod 32 bellows

Claims (2)

In a gas-insulated switchgear in which a disconnecting portion is accommodated inside a container filled with insulating gas, a driving portion is provided outside the container, and the driving portion is interlocked with the disconnecting portion.
A linear motion rod is passed through the opening of the container through a bellows in an airtight manner, and the drive unit is interlocked to the disconnection unit via the linear motion rod that reciprocates in the axial direction. Switchgear. 2. The bellows according to claim 1, wherein one end of the bellows is connected to the opening and the other end is connected to the linear motion rod in a state where the bellows enters the inside of the container. Gas insulated switchgear.

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