JPS60208021A - Method of producing arc-extinguishing tube - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION This defense applies to high pressure out fuses) 1! j
The present invention relates to a method for manufacturing an arc tube, and more specifically, to a method for manufacturing an arc extinguishing tube using a lining arc extinguishing agent such as boric acid or aluminum hydroxide.

Conventionally, 8Y was made by stretching a fusible material between the head terminal and the lower lead wire, and covering the entire body with an arc-extinguishing tube. However, if Hikozu is exposed to an arc for a long time during low current operation, burnout may occur due to insufficient rise in internal pressure, or arc resistance. This sometimes caused damage to the fuse and even made it impossible to shut it off. Also, during high current operation, the arc extinguishing bulb may be destroyed and scattered due to the sudden increase in internal pressure, or it may burn out instantly, causing the arc extinguishing ability to deteriorate during operation. I! There were problems such as i was lost and m could not be disconnected. As a solution to these problems, arc-extinguishing duplexes such as boric acid chews are available as lining arc-extinguishing agents.

This is a well-known technique in which the lining is simply asbestos with an FM acid-resistant layer, or the outside is coated with kraft paper, vinyl chloride, polycarbonate, or the like. Regarding the arc-extinguishing ability of this lining dlllll mixture liru arc-extinguishing JI-B, first, when the fuse is operated at a small current, the arc-extinguishing agent is easily thermally decomposed by the arc, and the arc-extinguishing agent is easily decomposed by the arc. Since the internal pressure rises extremely easily, and the breaking capacity is dramatically improved, the pyrolysis gas effect rack instantly shuts down the outer tube during high current operation. The arc extinguishing agent easily breaks due to excessive pressure changes, so it acts as a buffer against the outer duplex and prevents the entire arc extinguishing tube from being destroyed and scattered. There is also 0)'(-.As mentioned above, arc-extinguishing tubes with an arc-extinguishing agent lining have excellent arc-extinguishing ability, but in the conventional manufacturing method, asbestos paper is lined with 11JI acid. Wrap it in a tube or asbestos!
After filling with an aqueous solution of 1-acid and drying, holes were punched in a separate process. Generally, the outer diameter of the arc extinguishing duplex of a high-pressure hit-out fuse is small, so the arc extinguisher wall 19 is necessarily thin, but in conventional manufacturing methods, such a thin lining layer is integrally formed. It is unsuitable as a method, and it is difficult to produce a good product that is dimensionally stable and has good integrity with the cylindrical body.It also causes uneven thickness, and the average wall strength of the arc extinguisher. Because it is difficult to do so, vibrations may cause parts of the wall of the arc extinguisher to collapse, impairing the properties of the fusible material, and in some cases causing damage to the 1F4 in the fuse.
4111i was also incapacitated, and there was a crisis.

Therefore, the purpose of this invention is to provide a new 4R manufacturing method that is stable in terms of mowing and strength, has good integrity with the cylinder, and has excellent productivity. It is in.

In order to achieve the above object, the lining arc extinguishing agent is integrally molded under pressure in a closed mold, thereby making the thickness and strength of the arc extinguishing agent layer uniform and improving the thickness of the cylindrical body. This is aimed at good integration with the In other words, 1all? When forming a lining layer using a powdered arc-quenching agent such as tunorminium hydroxide, the powdered arc-quenching agent is mixed into a binder solution, such as an aqueous methyl cellulose solution or a polyvinyl chloride solution, while asbestos paper, After installing the cylinder for arc extinguishing dupe such as Kushino (~ group) in a closed mold and filling it with the powdered arc-extinguishing agent solution under pressure, insert a press-fit bottle passing through the central axis of the cylinder into one end of the cylinder. The filling material corresponding to the passage valve m of the press-fit bottle was extruded from the open part of the mold, and the press-fit bottle was returned. That is.

Hereinafter, a method for manufacturing an arc-extinguishing tube having an arc-extinguishing agent lining according to the present invention will be described in detail with reference to the drawings.

An example of a closed mold used in the present invention will be described with reference to FIG. 1. As shown, it has a three-part structure. That is, 1a is a movable type that opens left and right in the drawing, F, and a cylindrical body 2 for an arc extinguishing tube is set inside.
It is divided in the diametrical direction, and in the vertical direction by a movable mold 1b that is press-fitted from the top surface, and a fixed mold 1c that defines the bottom surface side.

The movable mold 1b has a press-fitting pin 3 that moves up and down independently.
3.Furthermore, the fixed IC has an obturator 4 which is interlocked with the press-fitting pin 3 with a time lag or which moves vertically.

In the state shown in FIG. 1, the arc-extinguishing tube member 2 made of asbestos is set in the sealed mold as described above, and a solution 5 in which boric acid powder is mixed into an aqueous methyl cellulose solution is injected.
This shows a state in which Katan filling has started using the movable mold 1b. In this case, the asbestos is also impregnated at the same time.

After pressurized filling, as shown in FIG. 2, a press-fit bottle 3 moving through the central axis of the cylinder 2 is press-fitted from one end of the cylinder. In this case, the obturator 4 that closes the opening 6 of the fixed mold 1C moves according to the press-fitting of the press-fitting bottle 3 while maintaining effective extrusion pressure, and as shown in FIG. When the material is press-fitted to the position where it penetrates through the hole, one piece of material 1'il is pushed out from the opening 6 in an amount corresponding to approximately the size of the press-fitting bottle 3. FIG. 4 shows an arc-extinguishing tube that has been dried and assimilated after the H-man pin has been removed and molded, and the lining arc-extinguishing agent 7 is formed in two parts. In this example, methylcellulose was used as the binder and boric acid was used as the powdered arc extinguisher.In addition, vinyl chloride and powdered filament were used as the binder.
Aluminum hydroxide etc. can be used as the 1j mixture, and it is not limited to a specific substance. Also, m of the binder solution
The concentration is 1 to 3% in methylcellulose aqueous solution, the weight ratio of binder solution and powdered arc quenching agent is about 1:1, and the pressure cylinder is 3 to 4%.
The amount is approximately 1,000 tons, but is not limited to this.

As mentioned above, the powdered arc-extinguishing agent solution is pressurized and filled into a dense film mold, so the density of the filling is high, the wall strength after drying is even, and the integrity with the cylinder is extremely strong. and
It is also dimensionally stable. In addition, at the stage where fluidity is maintained after filling, a press-fit pin of a predetermined size is press-fitted to form the lining arc-extinguishing agent of the desired thickness, so uneven thickness can be avoided, and good products can be ranked as high as 11J. It is something that can be produced. The arc extinguishing tube thus obtained can be used alone, and
Furthermore, the outside is covered with kraft paper, vinyl chloride, polycarbonate cylinder, etc. for use. Although it is possible to form the lining arc-extinguishing agent directly on the kraft paper cylinder, in consideration of the difference in swelling degree between the two, it is preferable to use a double cylinder. Furthermore, if the lining arc-extinguishing agent comes into contact with wind and rain or rainwater that has entered through the lead wire, the arc-extinguishing agent will not only melt and not be effective, but also adhere to the fusible material. Although there is a concern that it may have a negative effect on the fuse's fusing characteristics, the arc-extinguishing tube obtained as described above is immersed in a solution of silicone oil or varnish for a certain period of time and dried.
A more preferable arc-extinguishing tube can be obtained by applying a thin film coating to the wall surface of the arc-extinguishing agent lining and performing water generation treatment.

As described above, the present invention provides an improved manufacturing method for an arc extinguishing tube that eliminates the lining arc extinguishing agent, which is favorable in terms of fX'S but has been difficult to manufacture. 1, and will greatly contribute to the field concerned.

[Brief explanation of the drawing]

1 to 3 are longitudinal cross-sectional views showing one embodiment of the manufacturing method according to the present invention, and FIG. 4 is a cross-sectional view of the finished product of chopsticks manufactured by rolling. ia, ib , lc -... Sealing mold 2... Cylindrical body for arc extinguishing tube 3... Press fit bottle 5... Solution 6.
... Frontage Department Representative Patent Attorney Yasuho Oshima Figure 1 Figure 2 Voluntary procedure amendment April 1985 258 1. Indication of matter 4'1 lO Japanese Patent W No. 63769 of 1959 2. Name of invention deleted Arc tube manufacturing method 3? +li Correct person ('1 What relationship) Patent applicant 4-25 Awaji-cho, Higashi-ku, Osaka-shi, Osaka Prefecture Osaka Hughes Co., Ltd. Representative Hisao Kano 4, agent 550 1-25 Edobori, Nishi-ku, Mutsusaka 30-5, claims column of the specification to be amended, detailed description of the invention,
A column for a brief explanation of the drawing and the drawing. 6. Contents of amendment (1) The claims are amended as shown in the attached sheet. (2) Insert the following sentence between the 6th and 7th lines of page 7 of the specification. "Figures 5 and 6 show other embodiments, and the same parts as in the above embodiment are given the same reference numerals.
is a movable type that opens left and right in the drawing, 10 has the bottom side l, (i+
It is a fixed type that allows the opening 6 to be closed by the obturator 4 to
are doing. 2 is the arc-extinguishing tube G set inside.
It is e1 body. The difference from the previous embodiment is that the pressurized injection nozzle 8 is closely fitted into the arc-extinguishing tip body 2.
The point is to use As shown in FIG. 5, the powdered arc quenching agent-containing solution 15 is pressurized and filled into the mold using the pressurized injection nozzle 8 using air force or mechanical pressure means, and is in a semi-dry state. The odor C injection nozzle 8 is removed. Next, as shown in FIG. 6, the pin guide 10 having the press-fit bottle 9 is closely fitted into the arc-extinguishing tube intermediate body 2, and the press-fit bottle 9 is press-fitted through the pin guide 10 while pushing out the excess filling material from the opening 6. . The press-fit bottle and pin guide are removed, released from the mold, and dried and solidified to obtain an arc-extinguishing tube having an arc-extinguishing agent lining. In addition, in the pressurized filling process shown in FIG.
It may be a separate fixed type, or the injection nozzle 8 and pin guide 10 may be used together. (3) mJI8J
5 and 6 are longitudinal sectional views showing other embodiments. Insert J. (4) In the 20th line of page 8, the text [3...Press-fit bottle] is corrected to "3.9...Press-fit bottle." (5) Add Figure 5 and Figure f56 to the drawings as shown in the attached sheet. 2. Claims (1) A powdered arc-quenching agent such as boric acid or aluminum hydroxide is mixed into a binder solution such as an aqueous methylcellulose solution or a polyvinyl chloride solution, and the solution containing the powdered arc-quenching agent is mixed with asbestos paper. The cylindrical body for the arc extinguishing tube of the kraft paper receiver is filled with pressure in a closed mold, and a press-fit bottle passing through the central axis of the cylindrical body is press-fitted from one end of the cylindrical body to the other end, and the metal A method for producing an arc-extinguishing tube having an arc-extinguishing agent lining, which comprises extruding approximately a pin's worth of filling material from the mold opening, handling the pins, and drying and solidifying the material after molding. Figure 5 Figure 6

Claims (1)

[Claims] (1) Add a powdered arc-quenching agent such as boric acid or aluminum hydroxide to a binder solution such as an aqueous methylcellulose solution or a polyvinyl chloride solution. The arc tube cylinder is pressurized and filled in a closed mold, and a press-fit pin that passes through the center axis of the cylinder is press-fitted from one end of the cylinder to the other, and approximately the amount of the bottle is filled from the mold opening. A method for manufacturing an arc-extinguishing tube using a lining arc-extinguishing agent, which comprises extruding a filling material, removing a pin, and drying and solidifying the tube after demolding.