JPS6217331B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a switch, and more particularly to a switch that extinguishes an arc by using fluid expanded by an arc when the arc breaks.

Conventionally, switches that extinguish arcs using, for example, sulfur hexafluoride SF ₆ gas, have been used to spray pressurized gas from a compressor against the arc that occurs when the shear is cut off, and switches that use movable contacts when the shears are cut off. There was one that sprayed pressurized gas using a cylinder and piston that worked together. However, the former requires a compression device and has a complicated structure. Further, the latter requires a pressurizing device consisting of a cylinder and a piston, so it has a complicated structure, and has drawbacks such as requiring a large driving force to move the movable contact in order to pressurize the gas.

For these types of switches, the fluid expanded by the heat of the arc at the time of the break is used instead of installing a high-pressure compression device or using a method to compress the fluid using operating force. A switch that extinguishes the arc can be considered. Conventional switches using this method have the disadvantage that the temperature of the storage chamber that stores the fluid expanded by the arc when the arc is cut off increases too much, resulting in a decrease in arc extinguishing performance.

In this invention, a fluid storage chamber is formed in a fixed outer cylinder by first and second contacts that can be brought into and out of contact with the fixed outer cylinder, and as a cutting method, the fluid pressure of the fluid in the storage chamber is reduced by generating an arc. In a switch that rapidly discharges fluid from the storage chamber to extinguish the arc, the purpose is to keep the temperature of the fluid in the storage chamber as low as possible and the pressure as high as possible. In order to achieve this object, in the present invention, the contact is provided with a shaft hole and a side hole that open and close as the contact moves and communicate between the storage chamber and the outside of the fixed outer cylinder.

The invention will now be described with reference to the illustrated embodiments. The entire sheath section of the switch shown in FIGS. 1 to 3 is housed in a switch container (not shown) filled with sulfur hexafluoride SF ₆ gas. In the figure, reference numeral 1 denotes a terminal plate fixed to a fixing part (not shown) and having a through hole 1a. Reference numeral 2 denotes a support member whose one end is fixed to the terminal plate 1, and has a through hole 2a connected to the through hole 1a of the terminal plate 1. Reference numeral 3 denotes a fixed outer cylinder having one end fixed to the other end of the support member 2, and a large diameter portion 3 connected to the through hole 2a of the support member 2 at one end.
a, and adjacent to the large diameter portion 3a, the large diameter portion 3a
It has a small diameter portion 3b having a smaller diameter. Further, at the other end of the small diameter portion 3b, a tapered portion 3d is formed which widens toward the open end 3c. Note that a locking portion 3e having a reduced diameter is formed in the axial middle of the large diameter portion 3a. Reference numeral 4 denotes a first contact which has a collar portion 4a that is slidably fitted into the large diameter portion 3a of the fixed outer cylinder 3, and has a contact member 4b at one end, and has a through hole 1a of the terminal plate 1. A guide rod portion 4c that passes through the support member 2 in a slidable manner is provided concentrically with the collar portion and is pressed upward in the drawing by a spring 4d disposed within the through hole 2a of the support member 2. Note that the upward movement of the first contactor 4 is stopped when the collar portion 4a engages with the locking portion 3e of the fixed outer cylinder 3.
A shaft hole 4e is formed at the axial center of the guide rod 4c. This shaft hole 4e communicates with the outside of the fixed outer cylinder through a first side hole 4f, and when the first contact 4 moves upward, the first
The first side hole 4f is closed by the side wall 1b and no longer communicates with the outside of the outer cylinder. On the other hand, when the first contactor 4 moves upward and the collar part 4a engages with the locking part 3e and the first contactor stops, the shaft hole 4e communicates with the outside of the fixed outer cylinder through the second side hole 4g. . The second side hole 4g is the collar portion 4a.
When not engaged with the locking portion 3e, the second side wall 1c prevents communication with the outside of the fixed outer cylinder. 5 is a guide rod 4c whose one end is fixed to the terminal plate 1 and whose other end is the guide rod 4c of the first contactor 4.
a terminal plate 6 fixed to a fixed part (not shown) and having a through hole 6a;
Reference numeral 7 denotes a second contact whose one end is slidably fitted into the fixed outer cylinder 3 and which is driven by a drive mechanism (not shown) to be able to come into contact with and separate from the first contact 4; slides through the through hole 6a of the terminal plate 6. In addition,
When both the contacts 4 and 7 are closed, the fixed outer cylinder 3 and the contacts 4 and 7 constitute a gas storage chamber 8. Further, the storage chamber 8 is connected to the fixed outer cylinder 3 through a gap 8a provided between the second contactor 7, when the first contactor is at the upper end or the lower end (FIGS. 1 and 3, respectively). is communicated with the outside of the switch container (not shown), that is, the fixed outer cylinder, through the shaft hole 4e. 9 is a current collector whose one end is fixed to the terminal plate 6 and the other end is in contact with the outer periphery of the second contact 7 to allow the contact to slide, and 10 is an arc generated between the two contacts 4 and 7. .

Next, the operation of this invention will be explained. As shown in FIG. 1, when performing a shearing operation in a state where both contacts 4 and 7 are closed, the second contact 7 is driven upward in the drawing by a drive mechanism (not shown). Then, due to the stored force of the spring 4d, the first contactor 4
moves following the second contactor 7 and compresses the gas in the storage chamber 8. Then, when the movable contact 7 moves further upward, the collar 4a engages with the locking part 3e and the movement of the first contact 4 is stopped, so that the contacts 4 and 7 are separated and both An arc 10 is generated between the contacts 4 and 7, and the storage chamber 8 in which the arc is generated communicates with the outside of the fixed outer cylinder through the shaft hole 4e and the second side hole 4g. FIG. 2 shows the movable contact 7 and the first contact 4.
In this case, the storage chamber 8 does not communicate with the outside of the fixed outer cylinder through the shaft hole 4e, and the storage chamber 8 does not communicate with the outside of the fixed outer cylinder through the shaft hole 4e until the collar portion 4b engages with the locking portion 3e. Pressure is accumulated. In this case, if the pressure is stored excessively when the arc current is large, the first contact moves downward and when it reaches the lowest end, the pressure is released through the shaft hole 4e and the second side hole 4g. Ru. By the way, after the arc 10 is generated between both the contacts 4 and 7, a part of the high temperature arc reaches the shaft hole 4.
e It is emitted through the second side hole 4g, but the arc 1
Since the gas in the storage chamber 8 that is in contact with zero expands, the pressure in the storage chamber 8 rises rapidly. Here, when the second contactor 7 is further moved upward and the end surface of one end of the second contactor 7 reaches the tapered part 3d, the gap between the tapered part 3d and the second contactor 7 increases, and from this gap Since the gas in the storage chamber 8 is rapidly discharged, the gas in the storage chamber 8 rapidly expands and is cooled. The arc 10 is then cooled by gas and extinguished.
FIG. 3 shows a state in which this shrunken operation is completed. In addition, when performing the closing operation in the opened state shown in FIG. The first
It is closed to the contact 4. When the second contact 7 is further moved downward, the spring 4d is compressed, the collar 4a engages with the support member 2, and both the contacts 4 and 7 are stopped. This state is shown in FIG. 1, and the storage chamber 8 is supplied with gas from a container (not shown) through the gap 8a to prepare for the next cutting.

According to this invention, the first contact disposed within the fixed outer cylinder and the second contact capable of coming into and out of contact with each other and slidably fitted within the fixed outer cylinder are provided, and both contacts are engaged with each other. When they are connected, the insulating cylinder and both contacts form a fluid storage chamber, and the arc at the time of insulation is used to expand the fluid in the storage chamber and increase the fluid pressure, and then the storage chamber is rapidly closed. The arc is cooled and extinguished by discharging fluid from the arc, but as the first contact moves, the arc extinguishing chamber, that is, the inside of the fixed outer cylinder and the outside of the arc extinguishing chamber (outside the outer cylinder) By providing a first side hole, a second side hole, etc. that communicate with or close the storage chamber, it is possible to prevent the temperature of the storage chamber from rising and to store sufficient pressure, improving the shearing performance. In addition, the spring pressure of the first contact can be weakened, the structure is simple, and the driving force of the second contact is small, which is a good effect.

[Brief explanation of the drawing]

Figures 1 to 3 are cross-sectional views showing an embodiment of the switch of the present invention. Figure 1 shows the closed state, Figure 2 shows the switch being disconnected, and Figure 3 shows the switch being disconnected. It is a figure which shows each state. 1, 6...Terminal board, 1a...Through hole, 1b...
First side wall, 1c... second side wall, 2... support member,
2a...Through hole, 3...Fixed outer cylinder, 3a...Large diameter part, 3b...Small diameter part, 3c...Open end, 3d...
Tapered part, 3e...Locking part, 4...First contactor,
4a...Brim part, 4b...Contact member, 4c...Guide rod part, 4d...Spring, 4e...Shaft hole, 4f...
First side hole, 4g... Second side hole, 5, 9... Current collector, 7... Second contact, 8... Gas storage chamber, 8a
...Gap, 10...Arc.

Claims (1)

[Claims] 1 A fixed outer cylinder, a first contact slidably disposed within the fixed outer cylinder, and a first contact movably fitted into the fixed outer cylinder and movable into and out of contact with the first contact. 2 contacts, and an elastic member that presses the first contact toward the second contact, the first and second contacts
When the contactor is closed, the fixed outer cylinder and both the contactors constitute a fluid storage chamber, and the first contactor has a shaft hole in its guide rod portion and a first and second shaft hole communicating with the shaft hole. a second side hole, the first side hole communicates the shaft hole with the outside of the fixed outer cylinder when the first contact is in the closed position, and the second side hole communicates with the outside of the fixed outer cylinder when the first contact is in the closed position. communicates the shaft hole with the outside of the fixed outer cylinder at the end of the opening axial movement, and during the opening axial movement of the first contact, the first and second side holes are closed and the shaft hole is connected to the outside of the fixed outer cylinder. A switch characterized in that the switch is located in the axial direction of the first contact so as to prevent communication with the outside of the fixed outer cylinder.