JP2577301Y2 - Gas disconnector - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas disconnector having a structure in which an arc is extinguished by an insulating gas sucked into a puffer chamber when an electrode is opened.

[0002]

2. Description of the Related Art A conventional gas disconnector will be described with reference to FIG. As shown, the gas disconnector includes a fixed unit 21 and a movable unit 22.

[0003] The fixed unit 21 is configured as follows. A fixed shield 23b is fitted to the fixed conductor 23 via a ring 23a in order to form the fitting portion 8 in the fixed conductor 23, and one end of the fixed shield 23b is fixed inside the fixed shield 23b.
A plurality of fixed main contacts 25 are provided, which are in contact with the outer peripheral surface of the main contact 3 and the other end is in contact with the outer peripheral surface of the movable main contact 29, and are bound by a spring 24. Fixed conductor 2
A concave portion is formed in the center of the distal end of 3, and the base end portion of the fixed arcing contact 1 is loosely fitted in the concave portion. A spring 7 for urging the fixed arcing contact 1 toward the fixed conductor 23 is provided between the fixed arcing contact 1 and the spring receiver 6 attached to the distal end surface of the fixed conductor 23 via the bolt 5.

[0004] The movable unit 22 is configured as follows. The base end of the puffer cylinder 28 whose front end faces the fixed shield 23b is attached to the fixing member 31.
The movable main contact 29 is slidably inserted into the insertion hole 27a of the puffer cylinder 28, and the movable main contact 29 is slidably inserted into the insertion hole 27b of the fixed member 31 via the sliding member 30. And is linked to driving means (not shown). Puffer cylinder 28
A contact 32 is buried at the tip of the movable contact 29 and makes sliding contact with the movable main contact 29. Then, a shield 33 covering the contact 32 is screwed to the tip of the puffer cylinder 28. A large diameter portion 27c is formed in the insertion hole 27a of the puffer cylinder 28, and a piston 34 fixed to the movable main contact 29 is slidable on the inner peripheral surface of the large diameter portion 27c. A puffer chamber 35 is formed on the left side of. On the other hand, the space on the right side of the piston 34 in the large diameter portion 27c communicates with the outside of the puffer cylinder 28 through a plurality of communication holes 36.

Next, a description will be given of a structure for guiding the insulating gas from the tip of the movable main contact 29 into the puffer chamber 35. The movable arcing contact 3 is fixed to the tip of the movable main contact 29, and a flow path 37 is formed through the movable main contact 29 and the movable arcing contact 3.

Next, the operation of the gas disconnector will be described.

When the movable main contact 29 is driven rightward in the drawing from the closed state shown in FIG. 4A, the large-diameter portion 1a of the fixed arcing contact 1 comes into contact with the movable arcing contact 3, and then, as shown in FIG. As shown in FIG. 5, the arc 41 separates from the movable arcing contact 3 and an arc 41 is generated between them.
Even if the fixed arcing contact 1 and the movable arcing contact 3 are misaligned with each other, the fixed arcing contact 1 urged by the spring 7 swings around its base end. However, no excessive force is applied, and reliable contact is made before separation.

On the other hand, since the piston 34 moves together with the movement of the movable main contact 29, the pressure inside the puffer chamber 35 becomes negative, and the insulating gas is sucked into the flow path 37 together with the arc 41.

At the time of insertion, the fixed arcing contact 1 can swing, so that even if the fixed arcing contact 1 and the movable arcing contact 3 are misaligned with each other, no unreasonable force is applied to both members. Can be put in.

[0010]

However, such a gas disconnector has the following problems. That is, when the gas disconnector is opened, the stroke L until the movable arcing contact 3 separates from the fixed arcing contact 1
_Since no arc is generated during the movement time of _1, the puffer chamber 35
Although the suction of the insulating gas into the inside is not necessary, the volume of the puffer chamber 35 is forcibly expanded, so that the inside of the puffer chamber 35 and the inside of the flow path 37 have a negative pressure. For this reason, a large driving force is required in the initial stage of the opening, and the cost of the operating device of the gas disconnector increases. In addition, when a predetermined opening speed cannot be obtained due to a large negative pressure at the initial stage of opening, arc blowing may not be performed in some cases.

Therefore, an object of the present invention is to provide a gas disconnector which solves the above problem.

[0012]

In order to achieve the above object, the structure of the present invention is to prevent the puffer chamber from being under a negative pressure while the movable main contact moves by a certain stroke at the beginning of opening. And an auxiliary piston which is movable by a fixed amount with respect to the piston is provided on the side opposite to the puffer chamber.

[0013]

When the movable main contact starts moving and opening from the closed state in which the auxiliary piston is separated from the piston by a certain amount, the two ends are moved until the piston moves by a certain amount and contacts the auxiliary piston. The insulating gas between the pistons is compressed and moves from the communication hole to the puffer chamber. Therefore, the puffer chamber can be driven with a small driving force without negative pressure in the initial stage of the opening operation.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. In this embodiment, since a part of the conventional gas disconnector is improved, the same parts as those of the prior art are denoted by the same reference numerals, and description thereof will be omitted. Only different parts will be described.

(A) Embodiment 1 Embodiment 1 of a gas disconnector according to the present invention is shown in FIG.
(B). As shown, a plurality of communication holes 45 are formed in the piston 34 along the circumferential direction. And the large diameter part 2
An auxiliary piston 46 slidable on both the inner peripheral surface of 7 c and the outer peripheral surface of the movable main contact 29 is provided on the opposite side to the puffer chamber 35. The auxiliary piston 46 is coupled to the right end of the predetermined amount L ₂ only慣通the piston 34 has a head portion 47a slidably so as to be able to move more than one restraint pin 47 against the piston 34. Here, the auxiliary piston 4
Stroke L ₂ of 6 is set to the value of L ₂ <L _1. Increasing the L ₂ than L _1, because can not be suction of the insulating gas into the puffer chamber 35 for blowing out the arc.

Next, the operation of the first embodiment will be described. At the time of closing, the insulating gas is pushed out of the puffer chamber 35 through the flow path 37 to the outside, and at the same time, the insulating gas entering the communication hole 45 moves the auxiliary piston 46 rightward in FIG. Push. Therefore, in the closed state, the piston 34 and the auxiliary piston 4
6, a gap of L ₂ is generated. After this, FIG.
When the movable main contact 29 moves to the right in the figure as shown in FIG. 7, the insulating gas between the piston 34 and the auxiliary piston 46 passes through the communication hole 45 until the piston 34 contacts the auxiliary piston 46 as shown in the figure. to move to the puffer chamber 35 through, the puffer chamber 35 while the movable main contact 29 is moved by the first L ₂ does not become a negative pressure. Accordingly, the initial driving force of the movable main contact 29 may be smaller than before, and the arc 41 can be reliably blown out without reducing the opening speed.

(B) Embodiment 2 Embodiment 2 is shown in FIGS. 2 (a) and 2 (b). This example is
Restraining the closed state such that a gap between the piston 34 and the auxiliary piston 46 is reliably secured to the value of L ₂ pin 47
A spring 48 is interposed between the cylinder 28 and the restraining pin 47 to press the right side in FIG. Two or more springs 48 are provided along the circumferential direction, and the restraining pin 47 is formed with a support portion 47b projecting leftward from the head portion 47a and supporting the spring 48.

If the spring 48 is not provided, the auxiliary piston 46 may collide with the piston 34 due to inertia at the time of pole closing, and the gap L ₂ between the piston 34 and the auxiliary piston 46 may not be secured. surely it is secured a gap L ₂ in the present embodiment, as shown in Figure 2 (a). Therefore,
The effect shown in the first embodiment can be reliably obtained. The other configuration and operation are the same as those of the first embodiment, and thus the description is omitted.

(C) Third Embodiment FIGS. 3 (a) and 3 (b) show a third embodiment. This embodiment is also obtained by adding an improvement to Example 1, Example a function of holding the gap L ₂ shown in 2, puffer chamber 35 to the initial opening operation closes the left puffer chamber 35 In the latter half of the opening operation, the negative pressure of the puffer chamber becomes larger than in the first and second embodiments, and the pressure of the insulating gas blown to the arc is increased.

As shown in the figure, the cylindrical portion 49a and the flange portion 4
9b is provided in a state where the stopper 49 is inserted through the movable main contact 29. The right end of a support pin 50 slidably penetrating from a circumferential groove 49 formed in the puffer cylinder 28 toward the puffer chamber 35 is coupled to the flange 49b, and a spring 51 surrounding the support pin 50 is connected to the flange 49b and the puffer. Interposed between the cylinder 28.

In such a gas disconnector, the gap L ₂ is ensured by the spring 51 and the flange portion 49b when the contact is closed, and the stopper 49 reduces the puffer chamber 35 by the stroke L ₃ . Therefore, in addition to the same operations as in the second embodiment, the following operations are provided. That, L ₃ 3
The volume of the puffer chamber 35 becomes smaller by the amount of the stroke shown by the arrow, and the pressure in the puffer chamber 35 becomes lower in the second half of the opening operation than in the first and second embodiments. Therefore, more insulating gas can be sucked into the puffer chamber 35, and the ability to extinguish the arc increases. In opening early, while the piston 34 is moved by L ₂ puffer chamber 3
The inside of 5 does not become a negative pressure, and the same effect as in the first and second embodiments is maintained.

[0022]

As can be seen from the above description, according to the gas disconnector of the present invention, a communication hole is formed in the piston, and the auxiliary piston is provided on the opposite side of the puffer chamber so as to be movable by a fixed amount with respect to the piston. During opening, the insulating gas between the piston and the auxiliary piston moves to the puffer chamber through the communication hole. Therefore, the rate of pressure reduction in the puffer chamber at the initial stage of opening is smaller than in the past, and the driving force of the movable main contact is small. Therefore, a small and inexpensive driving means can be used. Further, since the ratio of pressure reduction in the puffer chamber in the initial stage of opening is small, the opening speed does not decrease and stable arc blowing can be performed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a gas disconnector according to a first embodiment of the present invention, in which FIG. 1 (a) is a cross-sectional view in a closed state, and FIG.

FIG. 2A is a cross-sectional view of a gas cross-sectional view according to a second embodiment of the present invention, in which FIG. 2A is a cross-sectional view in a closed state, and FIG.

FIG. 3A is a sectional view of a gas disconnector according to a third embodiment of the present invention, in which FIG. 3A is a sectional view in a closed state, and FIG.

4 (a) is a cross-sectional view of a conventional gas disconnector in a closed state, and FIG. 4 (b) is a cross-sectional view in the middle of opening.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... fixed arcing contact, 3 ... movable arcing contact, 8 ... fitting part, 23a ... fixed conductor, 25 ... fixed main contact, 27a, 27b ... insertion hole, 28 ... puffer cylinder, 29 ... movable main contact, 34 ... piston 35: Puffer chamber, 37: Flow path, 45: Communication hole, 4
6 ... Auxiliary piston, 47 ... Restriction pin.

Claims (1)

(57) [Scope of request for utility model registration] 1. A provided fixed main contact in the region of the inner peripheral surface of the fitting portion to form a fitting portion to the fixed conductor, which fixed arcing contact rod-shaped center of the fitting portion, the fixed
A puffer cylinder facing the fitting portion of the conductor is fixedly provided, a movable main contact slidably contacting the fixed main contact is reciprocally movable in the puffer cylinder, and is operatively connected to driving means to slide in the puffer cylinder. A piston movably provided to form a puffer chamber is coupled to the movable main contact, and a movable arcing contact is provided at a distal end of the movable main contact and formed through the movable arcing contact toward a base end of the movable main contact. In the gas disconnecting device in which the flow path is communicated with the puffer chamber, a communication hole is formed in the piston so that the piston is slidable with respect to the puffer cylinder and the movable main contact , so that the direct opening operation can be performed.
After the piston comes into contact later, it is pushed by the piston and
A gas disconnector , wherein an auxiliary piston for making a negative pressure in a chamber is provided on a side opposite to the puffer chamber so as to be movable by a fixed amount with respect to the piston.