JPS5948141A - Forming method of o-ring - Google Patents

Abstract

PURPOSE:To obtain the reliability on the long term sealing performance at a bonded joint by a method wherein O-ring stock with a cutoff gap, only both end parts of which are left un-vulcanized, is joined by vulcanization at installation site. CONSTITUTION:The O-ring stock 11' with a cutoff gap 18, only both end parts 12 of which are left un-vulcanized and the dimensions of which are predetermined, is manufactured in advance and the un-vulcanized end parts 12 are abutted with each other by a handy vulcanizer 13 at the installation side such as field or the like. Concretely, the vulcanization is performed at the state that the cutoff gap is closed in order to obtain an integral O-ring 11. At this time, the joint use of proper bonding agent 17 is also possible in order to ensure the joining of the O-ring.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of forming an O-ring, particularly an O-ring for a power cable connection box such as an OF cable joint box or end box.

O-ring (4) in the connection box of the power cable as shown in Figure 1.
If an oil leak (arrow (X)) accident occurs due to a defect, it is necessary to replace the O-ring with a good one. ), cut off the left and right cables (6) and (3), and insert the OIJ song 4). (Since it is assembled, you cannot insert the 0 ring without cutting it), and a dog-sized connection box requires a lot of man-hours.
Moreover, there was a risk that the original performance would be degraded when recompressing the conductor connection portion and reassembling the reinforcing insulation portion.

Furthermore, the method of simply gluing vulcanized rubber on-site to form an O-ring shape had a problem with the sealing performance of the bonded portion.

That is, with the conventional type, it is necessary to once dismantle the junction box, which requires a large amount of man-hour costs to replace the O-ring.

■ When recompressing the conductor, the compression ratio may be lower than the initial one. Therefore, there is a risk that the performance of the conductor connections will deteriorate.

■ Re-exposure the cable (in addition to initial assembly) to the atmosphere for an extended period of time and cause the cable to "bend" during reassembly.
Therefore, there is a possibility that the insulation performance of the reinforcing insulation part will not be adversely affected.

In Fig. 1, (5) is a junction box, (6) is lead work, (7) is insulating oil, (8) is a cable conductor, and (9) is cable insulation paper.

In view of the above, the present invention was developed to solve these problems. The present invention will be described in detail below with reference to illustrative FIGS. 1 and 2.

FIG. 2 is a side view of the O-ring material in the O-ring forming method of the present invention, and FIG. 6 is an explanatory view of completing the O-ring from the material. That is, in the present invention, only the end portion (12) as shown in FIG.
A ring material (11') is manufactured in advance, and a simple vulcanizer (11'
3), the unvulcanized end portions (12) are brought together, that is, the cut portions are brought together and vulcanized to form an integral O-ring (11). At this time, it is also possible to use a suitable adhesive (17) in order to ensure the connection of the O-ring. In FIG. 6, (15) is a heater, and (16) is a power source.

The method for forming the O-ring of the present invention is as described above, but the mere adhesion of the conventional vulcanized corner cut Q IJ material with an adhesive impairs the uniformity of the O-ring material, resulting in poor long-term sealing performance. There is still some concern about this, and it is highly dependent on the skill of the adhesive worker, making it highly unreliable.

On the other hand, connect and vulcanize the unvulcanized split O-ring material, and -
Using a wooden O-ring is a known technique that does not have the above-mentioned problem of adhesive parts, and O-rings of any size made by this method are commercially available. However, if all vulcanization is done on-site, there is a drawback that portable ring-shaped vulcanizers of various sizes are required.

However, according to the present invention, one type of small linear vulcanizer is sufficient. Furthermore, since the cut portions are connected at the same time as vulcanization, reliability is excellent.

Furthermore, when the O-ring forming method of the present invention is applied to a power cable connection box in particular, the O-ring can be attached as follows, so the reinforcing insulating paper and the conductor connection part described at the beginning are disassembled. There is no need (see Figure 1.2.6).

1. Remove the flange tightening bolts of the junction box (5) from which oil has been drained.

2. Remove the right lead wire (6) from the junction box (5).

6. Slide the right side of the junction box (5) to the right side of the cable.

4. Cut and remove the defective Q IJ song 4).

5. Defective Q: O-ring material of a size that can replace the IJ song (
11') from the side around the outer periphery of the reinforcing insulating paper (1) in the center of the connection part. (You can also fit it on the cable slightly in front of the right side of the junction box that was shifted in step 3.) 6.0 Ring material (11) Butt the end part (12) of the ring together.

Input Q IJ song (11 terminal parts (12) are vulcanized and connected using a simple vulcanizer (13) to form Q IJ song 11).

8. Move the right side of the junction box that was previously moved toward the cable side to the center of the connection area.

9. Fit the O-ring (11) onto the flange.

10. Tighten the bolts on the left and right flanges, and redo the lead work that was removed earlier.

11. Lubricate.

Therefore, there are the following advantages.

■Repairs can be carried out in a short time and at low cost.

@ Does not adversely affect the performance of conductor connections.

No adverse effect on the O-reinforced insulation section.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a power cable connection box using the 01J ring, Fig. 2 is an explanatory side view of the O-ring material used in the Q IJ song forming method of the present invention, and Fig. 6 is a side view for explaining the O-ring material used in the Q IJ song forming method of the present invention. In the method of forming the 0-ring, Q
A side view for explaining a method of completing an IJ song is illustrated. (1)... Reinforced insulating paper, (2)... Compression sleeve,
(3)...cable, (4)...0 ring, (5)
... Junction box, (6) ... Lead work, (7) ... Insulating oil,
(8)...Cable conductor, (9)...Cable insulation paper (11)...Q IJ song (11')...Cut part Q IJ song material, (12)...Unfinished Sulfur terminal, (
13)... Simple vulcanizer, (14)... Vulcanization intermediate part

Claims (2)

[Claims] (1) Cutting 0 with only the terminal part unvulcanized and the rest vulcanized
O characterized in that the ring material is vulcanized and connected at the mounting location, the unvulcanized part is vulcanized, and the cut part is connected at the same time.
How to form a ring. (2) Q according to claim (1), in which the cut portions are connected simultaneously with vulcanization using an adhesive as an auxiliary means.
How to form an IJ song. (b) A method for forming an O-ring according to claim (1), wherein the O-ring is for use in a power cable connection box.