JPH0689627A - Method for storing rubber stress cone molding for cable connection part - Google Patents

Abstract

PURPOSE:To completely prevent the contamination of foreign matters or moisture and to reduce the dissolving amt. of air housing a rubber stress cone molding in a vacuum-drawable container and by retaining pressure, in the container below the specific pressure. CONSTITUTION:An unassembled rubber stress cone molding 1 for cable connection part is housed in a vacuum-drawing container. Next, pressure in the container 2 is retained below 20cmHg, preferably, 10cmHg. The molding 1 housed in the container 2 under reduced pressure develops no contamination of foreign matters or moisture. The dissolving amt. of air is reduced under a pressure of 20cmHg. Where, the molding 1 is pushed down to the bottom of the container 2 by means of a spring 3. A connection part having high electrical reliability can be formed by assembling the molding stored in this way. The rubber stress cone molding for cable connection part stored in this way has no possibility of developing air gap at the interface to cable insulator, etc., after assembly, improving electrical reliability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for storing a rubber stress cone molded body for a cable connecting portion.

[0002]

2. Description of the Related Art The rubber used for a rubber stress cone molded body for a cable connecting portion is ethylene propylene rubber,
Silicone rubber, etc., and such a rubber has a volume ratio of about 1 to 10% per volume of rubber under 1 atmospheric pressure condition.
The air is dissolved. Further, if this molded article is left to stand in a moist atmosphere, it absorbs water. In order to prevent inhalation, absorption of water, or damage to the skin, it has been customary to put the molded product in a bag made of polyethylene or the like, and then package and store it in a paper box.

[0003]

In the conventional storage method,
A state in which 1 to 10% of air is already dissolved per volume of the molded product because foreign matter, water, etc. are easily mixed in, may be damaged, and are stored in normal air. , And could not reduce this. If a cable is connected using a molded body that has foreign matter or water attached, or has a large amount of air gaps, the electrical reliability will decrease.

Therefore, an object of the present invention is to provide a method for storing a rubber stress cone molded body for a cable connecting portion, which can completely prevent foreign matter and water from being mixed in and can reduce the amount of dissolved air. .

[0005]

In order to achieve the above-mentioned object, the present invention comprises a step of accommodating a rubber stress cone molded body for a cable connecting part before assembly in a container capable of being evacuated, and 20 cmHg in the container. Below, preferably 10 cmHg
The following steps are to maintain the pressure.

[0006]

The foreign matter and water are not mixed in the molded product contained in the container under reduced pressure, and the dissolved amount of air is reduced under the pressure of 20 cmHg or less. By assembling the molded body thus stored, it is possible to form a connection portion having high electrical reliability.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

In the example shown in FIG. 1, a rubber stress cone molded body 1 for a cable connecting portion before assembly is housed in a container 2 capable of being evacuated, and the inside of the container 2 is maintained at a pressure of 20 cmHg or less, preferably 10 cmHg or less. This shows the state where the molded body 1 is stored. The molded body 1 housed in the container 2 is pressed against the bottom of the container 2 by the spring 3. In this state, the pressure inside the container 2 is reduced. When the molded body 1 is assembled, the surface of the cable that contacts the insulator and the surface that contacts the epoxy unit are preliminarily coated with silicone oil or the like and stored in the container 2.

Specifically, after the molded body 1 is manufactured, the molded body 1 is placed in a container 2 and subjected to a vacuum deaeration treatment at 10 cmHg or less for 10 minutes or more to obtain a molded body 1 containing rubber. Dissolved air can be kept low. This state is maintained until assembly at the construction site, the decompression container 2 is opened at the time of construction, and the molded body 1 is inserted into the cable to assemble the joint. Even if there is an air gap between the surface where the molded body 1 contacts the insulator of the cable and the surface where the molded body 1 contacts the epoxy unit, the air easily dissolves in the rubber. It disappeared in about a day.

In FIG. 2, the rubber 10 for molding the molded body 1 is a block having a thickness of 40 mm, a length of 100 mm and a width of 100 mm.
Glass 11 was placed on both sides of this rubber 10 and housed in the container 2 while being pressed by the spring 3. In this experiment, as a comparative example, a constant amount of 0.2 cc was generated by a syringe as an air gap between the upper glass 11 and the rubber 10. In addition, in Examples 1 to 3, the glass 11 and the rubber 1 were used.
Silicone oil (500 Cst, degassed product) that had been sufficiently degassed in advance was applied to the interface with 0. The results are shown in the table below.

[0011]

[Table 1]

[0012]

As described above, according to the present invention, the rubber stress cone molded body for the cable connecting portion before assembly is kept to a minimum by the inclusion of foreign matter, water, etc. The air dissolved in the rubber can be kept low. The rubber stress cone molded body for cable connection portion stored in this manner has no possibility of air gaps being formed at the interface with the cable insulator etc. even after assembly,
The electrical reliability is improved.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a preferred embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an experimental example.

[Explanation of symbols]

 1 Rubber stress cone molded body for cable connection 2 Container

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kaoru Fukunaga 1-5-1 Kiba, Koto-ku, Tokyo Within Fujikura Electric Wire Co., Ltd. (72) Inventor Takao Matsuda 1-9 Futabacho, Numazu-shi, Shizuoka Fujikura Electric Wire Co., Ltd. Company Numazu Factory

Claims (2)

[Claims] 1. A cable connection comprising a step of housing a rubber stress cone molded body for a cable connection portion before assembly in a container capable of being evacuated, and a step of maintaining a pressure in the container at 20 cmHg or less, preferably 10 cmHg or less. Method for storing rubber stress cone moldings for parts. 2. The method for storing a rubber stress cone molded body for a cable connecting part according to claim 1, wherein degassed silicone oil is applied to the molded body housed in the container.