JP2500538Y2 - High pressure air switch - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pressure air switch used in high-voltage power receiving equipment and the like, and more particularly to a high-pressure air switch with an improved arc extinguishing cylinder built in a switching electrode section.

[0002]

2. Description of the Related Art FIG. 5 shows the internal structure of a conventional high-pressure air switch. In the figure, 1 is a casing, 2 is an operating lever, 3 is a link mechanism, 4 is a drive rod at the final stage of the link mechanism 3, and 5'is a fixed contactor 8, a movable contactor 10, an arc extinguishing cylinder 11 which will be described later. It is an opening / closing electrode unit having a built-in ‘

As shown in FIG. 6, the open / close electrode section 5'includes a resin-molded fixed mold section 6 and a movable mold section 7 arranged outside thereof. A fixed contact 8 having a substantially cylindrical shape is attached inside the fixed mold portion 6, and a shield electrode 9 is arranged around the fixed contact 8. A cylindrical movable contact 10 is integrally arranged with the movable mold part 7 above the center of the fixed contactor 8. When the movable mold part 7 moves up and down by the drive rod 4, the movable contactor 10 moves. It is configured to move up and down so as to come into contact with and open the fixed contact 8. Furthermore, the movable contact 1
A cylindrical arc extinguishing cylinder 11 ′ is concentrically arranged around 0. As is well known, the arc extinguishing cylinder 11 'is for extinguishing the arc by cooling the arc generated when the current is cut off or turned on, and reducing the conductivity of the arc.

In the conventional high-pressure air switch having the above-described structure, the lever 2 is manually operated to contact and open the fixed contact 8 and the movable contact 10 in the air, thereby to generate a high-voltage large-current. While turning on and off, the arc generated between the contacts 8 and 10 is also extinguished.
It is extinguished by the action of 1 '. Here, FIG. 7 is an enlarged view showing a case where both contacts 8 and 9 approach each other when the switch is turned on, and the potential difference between both contacts 8 and 9 is 1
Nine equipotential lines e that divide into 0 are also shown in an overlapping manner. In FIG. 7, reference numeral 6a denotes the inner surface of the fixed mold portion 1, 1
1a 'shows the lower end of the arc extinguishing cylinder 11'.

[0005]

In the conventional high-pressure air switch, the carbide or metal powder generated by the preceding arc at the time of making or shutting down, especially at making, is an insulator, and the inner surface 6a of the fixed mold part 6 and the eraser. It may adhere to the bottom surface or the like of the lower end 11a 'of the arc tube 11' and stain these surfaces. Since the amount of the above-mentioned deposits becomes larger and wider as the number of times of charging increases, the preceding arc time becomes longer as the number of times of charging increases, whereby the charging performance deteriorates and as a result the number of times of charging decreases. was there. Further, due to the presence of the above-mentioned deposits, a flashover electric path is formed in the path of the movable contact 10 → the lower end 11a ′ bottom surface of the arc extinguishing cylinder 11 ′ → the inner surface 6a of the fixed mold portion 6 → the shield electrode 9 at the time of charging. However, this has further promoted the prolongation of the leading arc time, the decrease in the number of times of charging and the decrease in reliability.

In order to solve the above-mentioned inconveniences, the leading arc time is shortened by increasing the closing speed by operating the lever 2, or the inner surface 6a of the fixed mold portion 6 is connected to the contact portions of the contacts 8,10. It is conceivable to secure a sufficient space so as to keep away from it, but this causes new problems such as inconvenience in operation and increase in size of the entire switch. The present invention has been made to solve the above-mentioned problems, and the purpose thereof is to prevent the inconvenience in operation and the size of the switch from increasing, and to prevent the inconvenience caused by the adhesion of carbide or metal powder. It is an object of the present invention to provide a high-pressure atmospheric switch which has a simple structure and which can prevent the prolonging arc time from increasing and increase the number of inputs as a structure in which the arc is not formed.

[0007]

In order to achieve the above object, the present invention provides a movable contact, a fixed contact that contacts the moved movable contact, and a movable contact, which is disposed around the movable contact. In a high-pressure air switch equipped with an opening / closing electrode section having an arc extinguishing tube for removing an arc generated between contacts, an end of the arc extinguishing tube on the fixed contact side (for example, a movable contact and a fixed contact) In the case where the contacts are arranged coaxially in the vertical direction, a groove opening to the fixed contact side is formed in the lower end portion on the fixed contact side).

[0008]

According to the present invention, since carbides and metal powders generated by the preceding arc do not easily adhere to the groove formed at the end of the arc-extinguishing tube on the side of the fixed contact, the movable contact does not pass through the adhered matter. Therefore, no flashover electric path is formed to reach the shield electrode. As a result, it is possible to prevent the leading arc time from being lengthened and increase the number of times of charging.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a main portion of the opening / closing electrode portion 5 in this embodiment with a part thereof cut away. In this embodiment, only the structure of the arc extinguishing cylinder 11 is different from that of FIG. 6, so that the other components are given the same numbers and their detailed description is omitted. That is, the lower end portion 11a of the arc extinguishing cylinder 11 in this embodiment has an appropriate depth over the entire circumference,
In addition, a groove 11b that is open to the fixed contact 8 side is formed. 2 and 3 show only the arc extinguishing cylinder 11, and the groove 11b divides the lower end portion 11a into an inner cylinder portion 11c and an outer cylinder portion 11d, of which the outer cylinder portion 11d is the inner cylinder. It is formed to be longer than the cylindrical portion 11c.

Next, the operation of this embodiment will be described with reference to FIG. First, at the time of closing, the drive rod 4 is actuated by the operation of the lever 2 to move the movable mold portion 7 downward so that the movable contact 10 is brought into contact with the inner surface of the fixed contact 8 at the time of closing. At this time, in this embodiment, since the groove 11b is formed in the lower end portion 11a of the arc extinguishing cylinder 11, both the contactors 8,
The equipotential line e between 10 is as shown in FIG. The equipotential line e shown in FIG. 4 also shows the potential difference between the contacts 8 and 10 as 1
It is divided into 0 equal parts. That is, between the lower end portion of the inner tubular portion 11c and the lower end portion of the outer tubular portion 11d, which are formed separately,
Since there is an air gap due to the groove 11b, most of the equipotential lines e are concentrated inside the inner cylinder portion 11c and the outer cylinder portion 11d while avoiding the groove 11b. Therefore, at the lower end of the groove 11b, as shown in FIG. 4, the interval between the adjacent equipotential lines e becomes wider than that in FIG. 7, and the resistance between the equipotential lines e increases accordingly.

Further, since the groove 11b is in the shape of a bag, even if carbide or metal powder is generated by the preceding arc, it is difficult to adhere to the inside thereof. In other words, due to the existence of the groove 11b, even if carbide or the like adheres to the lower end surfaces of the inner cylinder portion 11c and the outer cylinder portion 11d and the inner surface 6a of the fixed mold portion 6, the movable contact 10 → the inner cylinder portion of the arc extinguishing cylinder 11 11c → outer cylinder part 11
The flash electric path of the path of d → the inner surface 6a of the fixed mold portion 6 → the shield electrode 9 is not formed.

As a result, if the gap g between the lower end surface of the inner cylindrical portion 11c and the fixed contact 8 is set to a sufficient length so as not to be entangled with the normal ground voltage value, it is possible to set the gap before the closing. The arc time can be kept constant, and the number of times the switch is turned on can be increased more than before. Here, it is necessary to set the length of the gap g within a range that does not impair the arc extinguishing ability of the arc extinguishing cylinder 11.

The structure of each contactor and the arc-extinguishing cylinder described as an embodiment is an exemplification, and the present invention can of course be applied to a high-pressure air switch having another structure. Further, the operation method of the switch may be not only manual operation but also automatic operation method.

[0014]

As described above, according to the present invention, since the arc-extinguishing cylinder is formed with the groove at the end on the fixed contact side, the carbide or metal powder generated by the preceding arc is generated under the arc-extinguishing cylinder. Since the flashover electric path is not formed even if it adheres to the end surface or the surface of the insulator around the fixed contact and is contaminated, the number of times of charging can be increased by preventing the leading arc time from being prolonged.

[Brief description of drawings]

FIG. 1 is a front view showing a notched part of a main part in an embodiment of the present invention.

FIG. 2 is a front view in which a part of an arc extinguishing cylinder is cut away.

FIG. 3 is a bottom view of an arc extinguishing cylinder.

FIG. 4 is a sectional view of a main part showing equipotential lines at the time of charging.

FIG. 5 is an explanatory diagram of an internal structure of a high-pressure air switch for explaining a conventional technique.

FIG. 6 is a front view showing a notched part of a main part in a conventional technique.

FIG. 7 is a cross-sectional view of a main part showing equipotential lines at the time of closing in the conventional technique.

[Explanation of symbols]

 4 Drive Rod 5 Opening / Closing Electrode 6 Fixed Mold 6a Inner Surface 7 Movable Mold 8 Fixed Contact 9 Shield Electrode 10 Movable Contact 11 Arc-extinguishing Tube 11a Lower End 11b Groove 11c Inner Tube 11d Outer Tube e Equipotential Line

Claims (1)

(57) [Scope of utility model registration request] 1. A movable contactor, a fixed contactor that contacts the moved movable contactor, and an arc extinguishing cylinder that is arranged around the movable contactor and that eliminates an arc generated between the contactors. In a high-pressure air switch equipped with an opening / closing electrode section having, a groove opening to the fixed contact side is formed at the fixed contact side end of the arc-extinguishing cylinder. .