JPS5814265Y2 - Rubber packing covered with a synthetic resin layer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rubber backing covered with a synthetic resin layer, and more particularly to a rubber packing covered with a synthetic resin layer having a long service life.

Rubber backing is usually used as the backing for pipes that transport fluids, but for special purposes, such as severe chemical resistance and gas permeability, synthetic resins that can meet such requirements are used. Covering the surface with a layer is practiced.

Of course, the above-mentioned backing has a uniform thickness throughout, but many have ribs in order to improve sealing performance.

When the backing is compressed during use, if the backing is made of one type of material, the stress inside the backing will be distributed almost uniformly and there will be no problem. In the case of , the physical properties such as elongation and strain are different for each part, so the stress is not distributed uniformly and differs in each part, which often causes the synthetic resin layer covering the surface to break and become unusable. Was.

An example of such a case will be explained with reference to FIG.

When a rubber backing having protruding rib portions 5, 6 and valley portions 6 is compressed, the rib portions 5, 5 are compressed and deformed.
Usually, the rib portion 5 stretches and seeks escape from the strain in the adjacent valley portion 6. At this time, since the base portion 11 of the rib portion 5 is continuous with the valley portion 6 and is restrained, it receives the pressure from the top portion 12. The rib portion 5 is deformed so as to be crushed between the top portion 12 and the base portion 11, and the side surface 13 of the rib portion 5 [the top portion 12 and the base portion 1
1], large elongation and strain occur, and the synthetic resin layer 2
This results in damage to the product.

When the compression progresses further and both the rib portions 5 and the valley portions 6 are compressed on the same plane, the elongation strain of the rubber seeks refuge in the open end 14 of the backing, and a locally large elongation occurs there.
This causes distortion and causes damage to the synthetic resin layer 2.

The present invention eliminates the above-mentioned drawbacks by ensuring an appropriate escape area for rubber elongation and strain to prevent large local elongation and strain from occurring.

The rubber backing covered with synthetic resin of the present invention will be explained with reference to FIGS. The sealing section 3 includes a tip inclined portion 4 formed on the innermost side, and a plurality of rib portions 5 which are alternately formed concentrically between the tip inclined portion 4 and the outer portion 1.
,5. . . . and valley portions 6 , 6 , . . . . is the largest, followed by the outer portion 1, followed by the valley portions 6, 6.・・・・・・
This is a rubber backing covered with a synthetic resin layer, characterized in that * is slightly smaller than the outer part 1, and the tip inclined part 4 is the smallest.

The parts between flanges etc. that prevent liquid leakage are
The inner seal section 3 has a surface covered with a synthetic resin layer 2 having the above-mentioned structure, while the outer section 1 that is integrally in contact with the inner seal section 3 has a bolt insertion hole 8 formed in the flange. In order to attach the rubber backing, it is used to position the rubber backing during attachment [For example, when the side surface 1 of the outer section 1 is aligned with the top end of the flange, the attachment will be best and the bolts will be easier to insert. [Usually, once the flange surface contacts one surface of the outer side, the bolts can no longer touch the outer surface of the flange. Does not need to be compressed.

]This is a provision. Note that the tip bevel 4 in the inner seal area 3 is normally not compressed and the rib portions 5, 5.・・・・・・
etc. are compressed and try to disperse the force, in order to make the force escape as easily as possible, the floating dust is made as small as possible, and spread inward as much as possible in a tapered shape to prevent damage to the synthetic resin layer 2. It was established.

Hereinafter, the reason why the rubber backing of the present invention is not damaged even when used under compression will be explained in detail with reference to the drawings.

As shown in Fig. 4, the rib portion 5°5 and the outer portion 1
However, in a state where the valley portion 6°6 is not compressed yet, the backing is in the state shown by the chain line 17-1, and in such a state, especially when the bulge portion 18-1e is formed. By doing so, you can avoid damage, and
As shown in FIG. 5, the rib portions 5, 5 and the outer portion 1 are shown by arrows 15-2 at both ends.
When the troughs 6 and 6 are compressed, the backing is in the state shown by the chain line 17-2, and even in such a state, the bulge 18-2 and the tip slope in the outer part 1 are particularly compressed. By forming the bulge 19 at the tip of the portion 4, damage can be avoided.

This excellent damage prevention effect can be achieved because the floating dust in each part is the largest in the rib parts 5, 5, followed by the outer part 1, and the valley part 6.6 is slightly smaller than the outer part 1. This is because the tip inclined portion 4 is configured to have the smallest amount of elongation and to disperse strain, so that no large elongation or strain occurs locally.

In the above drawings, two ribs 5 and two troughs 6 are shown, but the same effect can be obtained even if there are three or more ribs 5 and troughs 6.

The rubber and synthetic resin used for the rubber backing covered with the synthetic resin layer of the present invention are appropriately selected depending on the fluid to be transported, but the former is usually polychloroprene rubber, acrylonitrile butadiene copolymer rubber, Ethylene propylene copolymer rubber, butyl rubber, etc. are used.
As the latter, polytetrafluoroethylene, polyvinylidene fluoride, polytrifluoroethylene, polystyrene, polypropylene polyester, polyvinyl chloride, nylon, etc. are used.

In the above description of the present invention, the term "backing" is used generically, including all gaskets, etc., as long as it does not contradict the purpose of the present invention. The shape, cross-sectional structure, etc. are also not particularly limited.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a rubber backing covered with a synthetic resin layer of the present invention, FIG. 2 is an enlarged sectional view taken along line A-A in FIG. 1, and FIG. 3 is an enlarged sectional view of a conventional rubber backing. 4 and 5 are enlarged sectional views illustrating the case where the rubber backing of the present invention is used under compression. 1...-IA outer part 2...Synthetic resin layer,
3... Inner seal section area, 4... Tip inclined part, 5... Rib part, 6... Valley part,
7...Side surface of outer part 1, 8...Bolt insertion hole provided in outer part 1, 11...Base of rib part 5, 12...・Same as the top, 13...
...Same side part, 14...Open end of backing, 15...Arrow indicating compression during use, 16.
... Compression position during use, 17 ... Deformed state of backing after being compressed during use, 18 ...
- Among the deformed state 17, the bulging part especially in the outer part 1, 19... Even in the deformed state 17, the bulging part in the tip inclined part 4.

Claims (1)

[Claims for Utility Model Registration] An inclined tip portion consisting of an outer portion 1 and an inner seal region 3 whose surface is covered with a synthetic resin layer 2, and the inner seal region 3 is formed at the innermost side. 4, a plurality of concentric ribs 5, 5°, and valleys 6, 6.・・・
In the rubber backing composed of..., the thickness of each part is as follows: rib part 5, 5... . . . is the largest, followed by the outer portion 1, followed by the valley portions 6, 6.・・・・・・
- A rubber backing covered with a synthetic resin layer, characterized in that it is slightly smaller than the outer part 1, and the tip inclined part 4 is the smallest.