JP2513738Y2 - 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. 7 shows an example of the internal structure of a conventional high-pressure air switch. In the figure, 1 is a casing,
Reference numeral 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 shield electrode 9, a movable contactor 10, an arc extinguishing cylinder 1 as described later.
1 ', an arc extinguishing cylinder retainer 12', an arc extinguishing rod 13 and the like are built-in electrode parts.

The open / close electrode section 5'includes a resin-molded cylindrical 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. In addition, a cylindrical movable contact 10 is integrally arranged with the movable mold portion 7 above the center of the fixed contact 8, and the drive rod 4
When the movable mold part 7 moves up and down by the
Is configured to move up and down to make contact with and release operation from the fixed contactor 8.

Further, a substantially cylindrical arc extinguishing cylinder 11 'is concentrically arranged outside the movable contact 10, and the upper end portion thereof is pressed and fixed by an arc extinguishing cylinder retainer 12'. Here, 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 when the current is turned on, and reducing the conductivity of the arc.

In the conventional high-pressure air switch constructed as described above, the lever 2 is manually operated to contact and open the fixed contact 8 and the movable contact 10 in the air to generate a high-voltage large-current. While turning on and off the load current, the arc generated between the contacts 8 and 10 is extinguished by the action of the arc extinguishing cylinder 11 '. here,
FIG. 8 is an enlarged view showing a case where both contacts 8 and 10 approach each other when the switch is turned on.
Nine equipotential lines e that divide the potential difference between them into 10 equal parts are shown in an overlapping manner by a chain line. In FIG. 8, 6a
Is the inner surface of the fixed mold portion 6, and 11a 'is the lower end surface of the arc extinguishing cylinder 11'.

[0006]

In the conventional high-pressure air switch, a fixed mold part in which carbide or metal powder (hereinafter referred to as impurities) generated by the preceding arc at the time of making or shutting down, especially at making, is an insulator. It may adhere to the inner surface 6a of 6, the lower end surface 11a 'of the arc extinguishing cylinder 11', etc., 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. Also,
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 surface 11a ′ 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. It further promoted the prolongation of arc time, the decrease in the number of times of charging and the decrease in reliability.

In order to solve the above-mentioned inconvenience, 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 problems, and its purpose is to prevent the inconvenience in operation and the size of the switch from becoming large, and to prevent the formation of a flashover electric path due to the adhesion of impurities. As a structure, it is to provide a high-pressure air switch with a simple structure that can prevent the prolonging arc time from increasing and increase the number of times of making.

[0008]

In order to achieve the above object, the present invention provides a movable contact, a fixed contact for contacting the moved movable contact, an outer side of the movable contact and an inner side of a fixed mold part. In a high-pressure air switch equipped with an opening / closing electrode section having an arc extinguishing tube for arranging and removing an arc generated between both contacts, an outer peripheral surface of an end of the arc extinguishing tube on the fixed contact side. A substantially annular fold is provided around and a gap is held between the outer peripheral surface of the fold and the fixed mold portion.

[0009]

According to the present invention, the conductive impurities generated by the preceding arc are unlikely to adhere to the pleated concave portions formed between the folds of the arc extinguishing cylinder, so that the movable contact may be mediated by the attached matter. No flash circuit 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.

[0010]

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, what is different from FIG. 7 is mainly only the structure of the arc-extinguishing cylinder 11, so that the other components are given the same reference numerals and the detailed description thereof is omitted.

2 to 5 are arc-extinguishing cylinders 1 in FIG.
2 is a front view, FIG. 3 is a plan view, FIG. 4 is a sectional view taken along line AA of FIG. 3, and FIG. 5 is a bottom view.
The structure of the arc extinguishing cylinder 11 will be described below with reference to these drawings and FIG. The arc extinguishing cylinder 11 in this embodiment is
An upper cylindrical portion 14 having a different outer diameter and the same inner diameter,
The central cylindrical portion 15 and the lower cylindrical portion 16 are formed coaxially,
A plurality of positioning projections 14a, 15a, 15b are formed on the outer peripheral surfaces of the upper cylindrical portion 14 and the central cylindrical portion 15 at appropriate intervals, respectively, and a plurality of annular folds 17 are formed on the outer peripheral surface of the lower cylindrical portion 16. It is built around and integrated.

Here, the projection 15b of the central cylindrical portion 15 is formed in a substantially inverted trapezoidal shape when viewed from the front and has a sufficient height, and the side surface of the projection 15b and the outer peripheral surface of the fold portion 17 are formed. By making the distance d ′ between the inner surface 6a of the fixed mold portion 6 and the outer peripheral surface of the fold portion 17 sufficiently large, it is considered that the distance d ′ between the inner surface 6a and the outer peripheral surface of the fold portion 17 is sufficiently secured. Further, fold recesses 18 are formed between the folds 17 and between the uppermost fold 17 and the central cylindrical portion 15, respectively.

The arc-extinguishing cylinder 11 thus formed is mounted on the outside of the movable contact 10 as shown in FIG. 1, and the ring-shaped arc-extinguishing cylinder presser 12 is screwed to the inner surface of the upper end of the fixed mold portion 6. It is fixed by doing. At this time, the projection 14a of the arc extinguishing cylinder 11 is engaged with the inner surface of the arc extinguishing cylinder retainer 12, and the lower end surface of the projection 15b has the fixed mold portion 6 therein.
A step 6b formed on the inner surface 6a (see FIG. 6 described later)
Is locked to. Further, in this state, a gap d is held between the outer peripheral surface of the fold portion 17 of the arc extinguishing cylinder 11 and the inner surface 6a of the fixed mold portion 6.

Further, since the arc extinguishing cylinder 11 is locked to the step portion 6b of the fixed mold portion 6 only by the projections 15b formed at four places around the central cylindrical portion 15, these projections 1
As shown in FIG. 1, the gap d is provided through the mutual gaps 5b.
The space S ₁ around the fold 17 including the fixed mold 6
And the space S ₂ surrounded by the inner peripheral surface of the central cylindrical portion 15 and the outer peripheral surface of the central cylindrical portion 15. Further, the upper protrusions 15a are also formed only at four places around the central cylindrical portion 15, and a gap is held between the protrusion 15a and the inner peripheral surface of the fixed mold portion 6, and the upper cylindrical portion is formed. Since the projections 14a of 14 are also formed only at four peripheral portions and the outer diameter of the upper cylindrical portion 14 is shorter than the inner diameter of the arc-extinguishing cylinder retainer 12, the space S ₂
The space S ₃ above the fixed mold portion 6 is also in communication with each other.

Next, the operation of this embodiment will be described with reference to FIG. First, at the time of closing, similarly to the above, the drive rod 4 is actuated by the operation of the lever to move the movable mold portion 7 downward to bring the movable contact 10 into contact with the inner surface of the fixed contact 8. At this time, in this embodiment, since the gap d is formed between the outer peripheral surface of the fold portion 17 and the inner surface 6a of the fixed mold portion 6, the equipotential line e between the contacts 8 and 10 is shown in FIG. It becomes as shown by the alternate long and short dash line. The equipotential line e shown in FIG. 6 is also obtained by dividing the potential difference between the contacts 8 and 10 into 10 equal parts. That is, the equipotential lines e pass through the arc extinguishing cylinder 11 and the fixed mold portion 6 so as to avoid the gap d, and the interval between the equipotential lines e adjacent to each other across the gap d is wider than in FIG. By this amount, the resistance between the equipotential lines e increases.

Further, since the arc extinguishing cylinder 11 has a plurality of pleats 17, and the pleated recesses 18 are formed between the pleats 17, even if conductive impurities are generated by the preceding arc, these are not formed. The structure is such that it does not easily adhere to the pleated concave portion 18. Therefore, if there is a sound part in the pleated recess 18 that is not contaminated by impurities even at one place, the movable contact 10 →
Lower end surface 11b of arc extinguishing cylinder 11 → inner surface 6 of fixed mold portion 6
The flashover electric path of the path from a to the shield electrode 9 is not formed.

Thus, if the gap g between the lower end surface 11b of the arc extinguishing cylinder 11 and the fixed contactor 8 is set to a sufficient length so as not to be entangled with the normal ground voltage value, it is possible to prevent The leading arc time can be kept constant, and the number of times the switch is closed can be increased more than ever 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.

Further, in the conventional example shown in FIGS. 7 and 8,
In particular, as shown in FIG. 8, a step portion 11c 'on the arc extinguishing cylinder 11' side is formed in a cylindrical shape over the entire circumference, and this step portion 11c 'is placed on the step portion 6b on the fixed mold portion 6 side. Therefore, the space S ₁ in FIG. 8 is isolated.
Therefore, conventionally, the gas containing conductive impurities generated by the arc cannot escape upward from the space S ₁ , and the impurities float in the space S ₁ and finally the fixed mold portion 6
There is a danger of flashing by sticking to the inner surface 6a and the lower end surface 11a 'of the arc extinguishing cylinder 11'.

On the other hand, in this embodiment, as described above, FIG.
The spaces S ₁ , S ₂ and S ₃ are all in communication with each other. Therefore,
Since the gas containing impurities escapes above the fixed mold portion 16 along the path of the space S ₁ → S ₂ → S ₃ , there is an advantage of delaying the contamination of the surface of the insulator. As a result, it is possible to further promote that the pleated concave portion 18 is maintained as a sound portion that is not contaminated.

Further, as described above, since the projection 15b is formed in an inverted trapezoidal shape when viewed from the front, the gas generated by the arc flows as shown by an arrow a in FIG. 2 and the flow path resistance is small. The gas can be smoothly released upward. At the same time, the area of the lower end surface of the projection 15b is extremely small, and the arc extinguishing cylinder 11 and the fixed mold portion 16 are in contact with each other only by the lower end surfaces of the four projections 15b. Compared with the structure in which the arc extinguishing cylinder 11 'and the fixed mold portion 16 are in contact with each other over the entire circumference of 6b, the probability that the creeping discharge path is generated can be significantly reduced.

Further, the diameter difference between the projection 15b and the inner surface 16a of the fixed mold portion 16, and the projection 14a and the arc-extinguishing cylinder retainer 1
The arc-extinguishing cylinder 11 by minimizing the diameter difference from the inner surface of 2
Can be prevented, and flashover due to the path between the lower end surface 11a of the arc extinguishing cylinder 11 and the shield electrode 9 can be prevented. In addition to this, as apparent from FIGS. 2 and 3, the arc-extinguishing cylinder 1
By forming the protrusions 14a and 15b so as to be offset from each other by 45 ° when viewed from the plane of No. 1, the inclination of the arc extinguishing cylinder 11 can be suppressed to a minimum and it is more effective in preventing flashover by the above path.

As described above, according to this embodiment, the arc-extinguishing cylinder 1
By improving the structure of No. 1 and the fixing means and the like to the fixed mold portion 16 related thereto, the charging performance can be further improved as compared with the conventional case. The structure of each of the contacts 8 and 10 and the arc extinguishing cylinder 11 described as an embodiment is merely an example, 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.

[0023]

As described above, according to the present invention, a fold is formed on the outer peripheral surface of the fixed contactor side end of the arc-extinguishing cylinder, and the outer peripheral surface of the fold and the inner surface of the fixed mold portion are formed. Since a gap is maintained between the two, the conductive impurities generated by the preceding arc do not form a flash circuit even if they are partially contaminated by pleats and the surface of the insulator around the fixed contact. It is possible to increase the number of times of charging by improving the leading arc time and improve the charging performance.

[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 of an arc extinguishing cylinder.

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

4 is a cross-sectional view taken along the line AA of FIG.

FIG. 5 is a bottom view of an arc extinguishing cylinder.

FIG. 6 is a sectional view of a main part showing equipotential lines at the time of charging.

FIG. 7 is an explanatory diagram of an internal structure of a high-pressure air switch for explaining a conventional technique.

FIG. 8 is a cross-sectional view of a main part showing equipotential lines at the time of closing in the conventional technique.

[Explanation of symbols]

5 Open / close electrode part 6 Fixed mold part 6a Inner surface 6b Step part 7 Movable mold part 8 Fixed contactor 9 Shield electrode 10 Movable contactor 11 Arc extinguishing cylinder 11b Lower end surface 12 Arc extinguishing cylinder retainer 13 Arc extinguishing rod 14 Upper cylindrical part 14a, 15a, 15b Positioning projections 15 Central cylindrical portion 16 Lower cylindrical portion 17 Ruffled portion 18 Ruffled recess d Gap e Equipotential line g Gap S ₁ , S ₂ , S ₃ Space

Claims (1)

(57) [Scope of utility model registration request] 1. A movable contactor, a fixed contactor which contacts the moved movable contactor, and an arc which is disposed outside the movable contactor and inside the fixed mold part to remove an arc generated between the contactors. In a high-pressure air switch having an opening / closing electrode section having an arc extinguishing tube, a substantially annular fold is provided around the outer peripheral surface of the end of the arc extinguishing tube on the fixed contact side. At the same time, a gap is provided between the outer peripheral surface of the fold portion and the fixed mold portion.