JPS6231460B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a switch, and in particular to a switch that blows out and extinguishes an arc by using fluid expanded by an arc during a break. It is related to vessels.

[Conventional technology]

Conventionally, there have been two types of switches that extinguish arcs using, for example, sulfur hexafluoride (SF ₆ ) gas; Sometimes, pressurized gas was sprayed using a cylinder and piston linked to the second contact.

[Problem that the invention seeks to solve]

However, the former requires a compression device and has a complicated structure. Furthermore, the latter requires a pressurizing device consisting of a cylinder and a piston, resulting in a complicated structure, and has drawbacks such as requiring a large driving force to move the second contact in order to pressurize the gas.

For these types of switches, there is a method of extinguishing the arc by using the fluid expanded by the arc at the time of breakage, without installing a high-pressure compression device or compressing the fluid by operating force. Switches can be considered. When this method is used, the temperature of the storage chamber that stores the fluid expanded by the arc at the time of extinguishing rises too much, resulting in a reduction in arc extinguishing performance.

[Means for solving problems]

The switch according to the present invention has a fixed outer cylinder that houses an insulating fluid, movably penetrates the wall of the fixed outer cylinder, and when the switch is closed, the tip is located inside the fixed outer cylinder, and when shut off, the tip is outside the fixed outer cylinder. a movable contact that is pulled out to the fixed outer cylinder, a fixed contact that is in the fixed outer cylinder and comes into contact with the circumferential surface of the movable contact when it is turned on; It engages with the tip of the contact, and when the movable contact is disconnected, the engagement is released and the movable contact is moved by the elastic member,
A sliding body that compresses the fluid in the gas storage chamber in the fixed outer cylinder; an opening provided in at least one of the sliding body and the movable contact that communicates the arc generation space with the outside of the fixed outer cylinder; It is provided with an enclosure that is disposed within the cylinder and is attached to the fixed contact and covers the engagement portion between the movable contact and the sliding body.

[Effect]

The switch in this invention isolates the space surrounded by the enclosure, the fixed contact, the end of the movable contact, and the end of the sliding body from the compressed fluid when the fluid is compressed. It is possible to confine the arc generated between the end portion and the end portion of the sliding body, prevent the temperature of the compressed fluid from rising, and prevent the fluid from escaping outside the fixed outer cylinder until compression is completed.

[Embodiment] Fig. 1 is an explanatory diagram of a cross section showing an embodiment of a switch according to the present invention, in which a shows a state in which the switch is closed, and b shows a state in which the switch is closed.

The figures will be explained below. The entire bottom section of the switch shown in FIG. 1 is housed in a container (not shown) filled with sulfur hexafluoride (SF ₆ ) gas.
In the figure, 1 is a terminal plate fixed to a fixed part (not shown) and has a through hole 1a, and 2 is a support member whose one end is fixed to the terminal plate 1, and is connected to the through hole 1a of the terminal plate 1. It has a through hole 2a. 3 is a fixed outer cylinder whose one end is fixed to the other end of the support member 2, has a large diameter part 3a at one end connected to the through hole 2a of the support member 2, and is adjacent to the large diameter part 3a. It has a small diameter portion 3b having a smaller diameter than the large diameter portion 3a.
Further, a tapered portion 3d that widens toward the open end 3c is formed at the other end of the small diameter portion 3b. Note that the large diameter portion 3a has a locking portion 3 at an intermediate position in the axial direction.
It has e. Reference numeral 4 denotes a sliding body having a collar portion 4a that slidably fits into the large diameter portion 3a of the fixed outer cylinder 3, and a contact member 4b fixed to the tip thereof, which slides through the through hole 1a of the terminal plate 1. A guide rod portion 4c is provided to
A spring 4d disposed within the through hole 2a of the support member 2
is pushed upward in the drawing by. The sliding body has an opening 4c at the center of the axis. Note that the movement of the sliding body 4 is restricted by the collar portion 4a engaging with the locking portion 3e of the fixed outer cylinder 3. Reference numeral 5 denotes a fixed contact whose outer side is fixed to the fixed outer cylinder 3 and whose inner side is composed of a contact member 5a, and an enclosure connected to one end of this fixed contact to cover the end of the sliding body 4 having the contact member 4b. A body 6 is provided. 7 is a terminal plate fixed to a fixed part (not shown) and has a through hole 7a; 8 is a terminal plate having one end slidably fitted into the fixed outer cylinder 3 and driven by a drive mechanism (not shown); It is a movable contact that can come into contact with and separate from the fixed contact 5, and the other end is connected to the terminal plate 7.
It slides through the through hole 7a. Note that when both the contacts 5 and 8 and the sliding body 4 are closed,
The fixed outer cylinder 3, both contacts 5, 8, the sliding body 4, and the enclosure 6 constitute a gas storage chamber 9. The gas storage chamber 9 also includes a gap 9a provided between the small diameter portion 3b of the fixed outer cylinder 3 and the movable contact 8, and the movable body 4.
It communicates with the outside of the fixed outer cylinder 3, that is, into the container (not shown), through an opening 4e provided in the. 10 is a current collector whose one end is fixed to the terminal plate 7 and the other end slides on the outer periphery of the movable contact 8; 11 is between the movable contact 8 and the sliding body 4 or between the two contacts 5, 8;
This is the arc that occurred between the two.

Next, the operation of this invention will be explained.

Now, when performing the welding operation shown in FIG. 1B from the closing time shown in FIG.
The movable contact 8 is disengaged from the movable contact 8, and the sliding body moves behind the movable contact 8 due to the delayed action based on the elastic member, so that an arc 11 is generated between the two. This arc 11 is generated only in the space surrounded by the fixed contact 5, the end of the movable contact 8, the end of the sliding body 4, and the enclosure, so that the gas storage chamber 9 is compressed. Since the arc is isolated from the gas, it is possible to limit the temperature rise of the compressed gas, and the compressed gas does not escape from the opening 4e into the fixed outer cylinder. When the movable contact 8 moves further upward and the sliding body completes the compression operation, the movable contact 8 and the fixed contact 5 are separated, and an arc is generated between both the contacts 5 and 8. On the other hand, since the gas in the gas storage chamber 9 that is in contact with this high-temperature arc expands, the pressure in the gas storage chamber 9 rises rapidly. Here, the movable contact 8 further moves upward, and the movable contact 8
When the end surface of one end reaches the tapered part 3d, the gap between the tapered part 3d and the movable contact 8 becomes larger.
The gas in the gas storage chamber 9 is rapidly discharged from this gap, and the gas in the gas storage chamber 9 rapidly expands and is cooled, so that the arc is cooled by the gas and is extinguished, completing its operation.

〔effect〕

According to this invention, when the fluid in the fixed outer cylinder is expanded and the fluid pressure is increased using the arc at the time of shearing, the enclosure creates a boundary between the arc generation space and the compressed fluid. By creating this, the temperature rise of the fluid is limited until the fluid is compressed, which has the effect of increasing the arc extinguishing ability.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a cross section showing an embodiment of the switch according to the present invention, in which a shows a state when the switch is closed, and b shows a state when the switch is closed. In the figure, 3 is a fixed outer cylinder, 8 is a movable contact, 4 is a sliding body, and 6 is an enclosure body. Note that the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] 1. A fixed outer cylinder containing an insulating fluid, movably penetrating the wall of the fixed outer cylinder, and having a tip located inside the fixed outer cylinder when turned on, and a tip positioned outside the fixed outer cylinder when shutting off. a movable contact that is pulled out to the fixed outer cylinder, a fixed contact that is in the fixed outer cylinder and comes into contact with the circumferential surface of the movable contact when it is turned on; A sliding body that engages with the tip of the contact, disengages from the engagement when the contact is cut off, moves by an elastic member behind the movable contact, and compresses the fluid in the gas storage chamber in the fixed outer cylinder; and provided on at least one of the movable contacts,
an opening that communicates the arc generation space with the outside of the fixed outer cylinder;
An enclosure is provided in the fixed outer cylinder and is attached to the fixed contact and covers an engaging portion between the movable contact and the sliding body, and the fixed contact, the enclosure, the movable contact, and the sliding body are connected to each other. A switch, characterized in that the arc generation space is not communicated with the gas storage chamber until the compression of the fluid in the gas storage chamber by the sliding body is completed. 2. A patent claim characterized in that the inner wall of the fixed outer cylinder into which the sliding body is fitted is a large diameter part, and the fixed outer cylinder wall through which the movable contact passes is a small diameter part whose diameter is smaller than the large diameter part. Switches listed in scope 1. 3. Claim 3, characterized in that the sliding body is composed of a flange that slidably fits into the large diameter portion of the fixed outer cylinder, and an elastic member that presses the flange. switch. 4. The switch according to any one of claims 1 to 3, characterized in that a tapered portion that widens toward the open end is formed at an end of the fixed outer cylinder.