JPS5829877Y2 - Arc chamber mounting structure such as cutout - Google Patents

Description

[Detailed description of the invention] This invention relates to an arc chamber mounting structure such as a high-pressure cutout.

The arc extinguishing chamber in the cylindrical high-voltage cutout is located between the in-phase poles, but in order to ensure the in-phase isolation during opening (i.e. when the fuse tube is pulled out), porcelain creeping insulation is used. It is better to ensure this to prevent insulation deterioration in the event of internal contamination.

For this purpose, it is necessary to suspend the arc extinguishing chamber from the upper fixed electrode side, and there have been various methods for this in the past.

However, they all have problems and have not yet been resolved.

For example, in Utility Model Publication No. 43-1445, the arc extinguishing chamber is suspended from the contact piece of the fixed electrode, so the degree of engagement for attaching the arc extinguishing chamber changes depending on the degree of displacement of the contact piece when attaching and detaching the electrode. Therefore, the mounting method for the arc extinguishing chamber is unreliable, and there is a risk that the arc extinguishing chamber may fall, or that the movement of the contact piece may deteriorate due to damage caused by arcing during current switching.

Applicant's Utility Model Publication No. 52-3628 solves the above problem, and is designed exclusively for mounting an arc extinguishing chamber, in which the fixed electrode is provided in a concave groove on the inner circumference of the arc extinguishing chamber, facing the contact piece of the fixed electrode. The arc extinguishing chamber is attached so that it can swing freely by hooking the handle piece.

This invention aims to eliminate the above-mentioned problem more completely, and a grip piece for attaching the arc extinguishing chamber, which is provided separately from the contact piece of the fixed electrode, is fixed without elasticity, and this grip piece is attached to the extinguisher. The arc chamber is swingable and securely held via a hanging piece, and the arc extinguishing chamber is not directly attached to the gripping piece, and this gripping piece is not made of elastic material. By locking the upper part of the hanging piece and attaching the arc extinguishing chamber to the lower part of this hanging piece, it is easy to install the arc extinguishing chamber, and the arc extinguishing chamber is provided only at the point where the arc occurs, increasing efficiency. Moreover, the arc extinguishing chamber is characterized by being extremely easy to mold.

An embodiment of this invention will be described below with reference to the drawings. 1 is a cylindrical cutout body, 2 is a cylindrical cutout body, and 2 is inserted through the upper end surface of the cutout body 1 by hanging its head into the hollow part of this cutout body 1. end fixing bolt supported and fixed, 3
1 is a fixed electrode in which the lower end of a terminal bolt 2 located in the hollow portion of the cutout body 1 is loosely passed through a hole thereof, and this fixed electrode 3 has an opposing contact 3a hanging down therefrom.

4 is a multi-fold flexible conductor with the lower end of the terminal bolt 2 loosely passed through its own hole, and 5 is fitted and fixed to the terminal bolt 2 on the flexible conductor 4 by a nut 6 for fixing the gripping piece. This gripping piece 5 has, at right angles to the opposing contact 3a of the fixed electrode 3, both side hanging key pieces 5a having a hat-shaped cross section.

7 is an extrusion spring whose upper end is fixed to the head of the terminal bolt 2 and is suspended inside the contact 3a of the fixed electrode 3; 8 is an extinguisher whose upper end is attached to the lower end of the extrusion spring 7; The arc bar 9 is a hanging piece made of elastic thermoplastic resin such as nylon, which is suspended from the hanging key pieces 5a on both sides of the gripping piece 5.This hanging piece 9 is shown in FIG. 3B. As shown, it is made up of two symmetrical members facing each other, each having a half-cylindrical piece 9b split in half at the lower end of an upper hanging piece 9a.

Reference numeral 10 denotes a fitting hole bored in the upper part of the hanging piece 9a of the hanging piece 9, and the fitting hole 10 is larger in cross section than the hanging key piece 5a.

Reference numeral 11 denotes an annular convex portion provided on the inner periphery of the half-cylindrical piece portion 9b of the hanging piece 9, and numeral 12 denotes an annular recess provided on the outer periphery of the half-cylindrical piece portion 9b.
Reference numeral 13 denotes a cylindrical arc extinguishing chamber made of thermosetting resin such as urea, and an outer groove 13a is bored in the upper outer periphery of this arc extinguishing chamber 13.

Reference numeral 14 denotes a spring attached to the annular recess 12 on the outer periphery of the hanging piece 9 in which the annular protrusion 11 of the hanging piece 9 is fitted into the outer groove 13 a of the arc extinguishing chamber 13 .

Then, the fitting holes 10 of these hanging pieces 9 are hooked to the hanging key pieces 5a on both sides of the gripping piece 5, and the hanging pieces 9 are hung at a right angle position to the contact 3a of the fixed electrode 3, and the extinguisher is turned off. An arc extinguishing rod 8 is positioned within an arc chamber 13.

This invention has the above structure, and a movable electrode (not shown) enters the arc extinguishing chamber 13, pushes the arc extinguishing rod 8, contacts the contactor 3a, and closes the electrode.

At this time, the contact 3a of the fixed electrode 3 is swingably suspended from the terminal bolt 2, and the arc extinguishing chamber 13 also has a hanging piece 9 for hanging the gripping piece 5 fixed to the terminal bolt 2. Since it is swingably supported by the key piece 5a, even if the position of the movable electrode is shifted, the contactor 3 of the arc extinguishing chamber 13 and the fixed electrode 3
The fitting contact to a is easy and reliable.

However, in addition to the fixed electrode 3, the arc extinguishing chamber 13 is fixed to a hanging piece 9 supported by a hanging key piece 5a of a grip piece 5 fixed to the terminal bolt 2, so that the movable electrode The arc extinguishing chamber 13 can be reliably held regardless of the movement of the contact 3a during attachment and detachment, and the arc extinguishing chamber 13 is not affected by damage to the contact 3a due to current switching.

Further, in this invention, as described above, the annular convex portion 11 provided on the inner periphery of the half-cylindrical piece portion 9b of the hanging piece 9 is fitted into the outer peripheral groove 13a on the upper part of the arc extinguishing chamber 13, and the annular convex portion 11 provided on the inner circumference of the half-cylindrical piece portion 9b is The arc extinguishing chamber 13 is fixed to the lower part of the hanging piece 9 by fitting the spring 14 into the annular recess 12, and the gripping piece is inserted into the fitting hole 10 bored in the upper part of the two opposing hanging pieces 9a of the hanging piece 9. Since the hanging key pieces 5a on both sides of the cut-out body 1 are hooked, the upper part of the hanging piece 9 cannot be hooked on the hanging key pieces 5a at the back of the hollow part of the cutout body 1 when installing the arc extinguishing chamber 13. Since the hanging piece 9 is made of an elastic material, it can be easily inserted into the small-diameter hollow part of the cut-out body 1, and the arc-extinguishing chamber itself can be inserted deep into the small-diameter hollow part as in the conventional case, and it can be attached to an appropriate object. Compared to hanging it, there is no risk of damaging the arc extinguishing chamber, and installation is extremely easy.

Further, the arc extinguishing chamber 13 of this invention is supported via a hanging piece 9, and the upper end of the arc extinguishing chamber 13 is located near the lower end of the contact 3a of the fixed electrode 3, so that the arc extinguishing chamber 13 is located only at the location where the arc occurs.
Because of this, the arc extinguishing chamber can be made smaller compared to the conventional example of Utility Model Publication No. 523628 mentioned above, in which the arc extinguishing chamber is supported directly on the fixed electrode and the arc extinguishing chamber is provided from above the fixed electrode. , which can be extremely efficient and reduce costs.

In addition, the arc extinguishing chamber 13 itself is cylindrical and has a simple structure, so it is easy to mold and a uniform arc extinguishing chamber can be obtained.When installed, the arc extinguishing chamber 13 itself is not divided, so it does not work like a conventional one. There is no need to consider the influence of gaps, and stable current extinction can be achieved.

As described above, in this invention, the arc extinguishing chamber is supported in a swingable manner via the hanging piece 9 by a fixed holding piece for attaching the arc extinguishing chamber, which is separate from the contact of the swingable fixed electrode. As a result, the arc extinguishing chamber is not affected by the movement or damage of the fixed electrode contactor, and the arc extinguishing chamber is reliably maintained, and the arc extinguishing chamber is easy to install, easy to mold, and This has the effect of downsizing the arc extinguishing chamber and reducing costs.

[Brief explanation of drawings]

The drawings show one embodiment of this invention. Fig. 1 is a partially sectional front view of this invention, Fig. 2 is a side view of the same sectional view, and Fig. 3 A, B, C.
2A and 2B are perspective views of the constituent members of this invention, respectively. In the diagram, 1 is the cutout body, 2 is the terminal bolt, and 3 is the cutout body.
3a is a fixed electrode, 3a is a contact, 5 is a gripping piece, 5a is a hanging key piece, 8 is an arc extinguishing frame, 9 is a hanging piece, 1° is a fitting hole, 11 is an annular convex part, 12 is annular Recessed part, 13 is arc extinguishing chamber, 1
3a is a groove on the outer periphery, and 14 is a mounting spring.

Claims (1)

[Scope of utility model registration request] A fixed electrode 3 is swingably suspended from a terminal bolt 2 protruding into the hollow part of the cylindrical cutout body 1, and a key piece 5a for hanging on both sides of a grip piece 5 is separately fixed to the terminal bolt 2. The fitting hole 10 provided at the upper part of each hanging piece 9a of the hanging piece 9 made of two opposing symmetrical elastic members is swingably hooked, and the half-cylindrical piece part 9b provided at the lower part of each of these hanging pieces 9a. are overlapped to form a cylindrical shape, and the outer peripheral groove 13a bored on the upper outer periphery of the cylindrical arc extinguishing chamber 13 is fitted into the annular convex portion 11 provided on the inner periphery of the half-cylindrical piece 9b. The arc extinguishing chamber 13 is mounted near the lower end of the contact 3a of the fixed electrode 3 by fitting a spring 14 into the annular recess 12 provided on the outer periphery of the cylindrical piece 9b and supporting the arc extinguishing chamber 13 on the hanging piece 9.
A mounting structure for an arc-extinguishing chamber such as a high-voltage cutout, characterized in that the hanging piece 9a of the hanging piece 9 is placed at right angles to the opposing contact 3a of the fixed electrode 3.