JPH11336906A - O-ring for piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an O-ring for piping excellent in the insertion operability of an insertion pipe for a pipe joint and seal up property. SOLUTION: In an O-ring for piping inserted in an O-ring groove G recessed along the peripheral direction on the outer periphery near the ends of respective insertion pipes P1 , P2 or the inside of a pipe joint, a sliding fused film 11 is provided on the periphery surface of a ring shape body consisting of a synthetic resin slide-contacted to the inside of the pipe joint PC or the outer periphery near the ends of respective insertion pipes P1 , P2 . Therefore, even in the construction spot under the dusty and very bad surrounding condition, the insertion resistance near the ends of respective insertion pipes P1 , P2 against the inside of the pipe joint PC can be reduced extremely by a sliding thermally fused film 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an O-ring for piping, and more particularly, to an O-ring for piping having a cross-sectional shape which reduces insertion resistance of an insertion tube into a pipe joint and has excellent sealing performance.

[0002]

As shown in the Background of the Invention 2-4, connected relatively sleeve fitting PC in an elongated polyvinyl chloride tube short pipe, by inserting each insertion tube P _1, P _2, such as polyethylene pipe In this case, a rubber O-ring 1 having a circular or elliptical cross-sectional shape is fitted into a plurality of O-ring grooves G recessed along the circumferential direction on the outer peripheral surface near each end. A piping method of inserting the respective insertion pipes P ₁ and P ₂ into the pipe joint PC and fitting and connecting the respective ends has often been implemented.

The O-ring 1 is usually provided with the O-ring groove G
3 has a slightly smaller width than the groove width, and has an outer diameter set so as to slightly protrude from the O-ring groove G. When inserted into the pipe joint PC, it is indicated by the hatched portion in FIG. Thus, the desired sealing property is obtained by compression deformation.

[0004]

However, in the conventional piping O-ring 1 described above, if the amount of protrusion from the O-ring groove G is increased to enhance the sealing performance, the connection resistance to the pipe joint PC is increased to increase the connection. While the work becomes difficult,
As the amount of protrusion decreases, the sealing performance decreases,
The amount of protrusion has to be set quite strictly. Therefore, the O-ring groove G and the O-ring 1 have to be processed or formed with a narrow dimensional tolerance.

An object of the present invention is to solve the above-mentioned problems of the prior art and to provide an O-ring for piping which is excellent in operability of inserting an insertion tube into a pipe joint and sealing performance.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is as follows.
In an O-ring for piping fitted in an O-ring groove recessed along the circumferential direction on an outer peripheral surface near an end of each insertion pipe or an inner surface of a pipe joint, an inner surface of the pipe joint or each of the insertion pipes And a lubricating film is provided on the peripheral surface of the annular frame portion made of a synthetic rubber material that is in sliding contact with the outer peripheral surface near the end of each insertion tube that is in sliding contact with the outer peripheral surface near the end of the insertion tube. Achieved by piping O-rings.

Further, an object of the present invention is to provide an O-pipe for a pipe, wherein the lubricating fusion film is obtained by thermally fusing a powdery or sheet-like polyolefin resin to a peripheral surface of the annular frame. Achieved by rings.

Further, the above object of the present invention is attained by an O-ring for piping, wherein the lubricating fusion film is layered to a thickness of 10 μm to 100 μm.

[0009]

The O-ring for piping according to the present invention is fitted in the O-ring groove recessed along the circumferential direction on the outer peripheral surface near the end of each insertion pipe or the inner surface of the pipe joint. In the O-ring for piping, the annular body portion made of the synthetic rubber material, which slides on the inner surface of the pipe joint or on the outer peripheral surface near the end of each of the insertion tubes, which slides on the outer peripheral surface near the end of each of the insertion tubes. Since the peripheral surface is provided with the above-mentioned slippery fusion film, even at a construction site under bad environmental conditions where dust easily occurs, the insertion resistance near the end of each of the insertion pipes against the inner surface of the pipe joint is reduced. It is significantly reduced by the lubricated heat-sealing film.

Further, in the O-ring for piping according to the present invention, the lubricating fusion film is formed by thermally fusing a powdery or sheet-like polyolefin resin to the peripheral surface of the annular frame. The thermo-fusible film is provided at a desired position with a relatively uniform thickness.

Further, in the O-ring for piping according to the present invention, since the lubricating fusion film is layered to a thickness of 10 μm to 100 μm, the vicinity of the end of each of the insertion pipes with respect to the inner surface of the pipe joint. This guarantees a reduction in the insertion resistance.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the O-ring for piping according to the present invention will be described below in detail with reference to the accompanying drawings.
Figure 1 is a cross sectional view showing an essential part of the piping O-ring 10 of the present invention, relatively long vinyl chloride tube, the outer periphery of each end near at each insertion tube P _1, P _2, such as polyethylene pipe FIG. 2 is an enlarged cross-sectional view showing a synthetic rubber piping O-ring 10 fitted in a plurality of O-ring grooves G recessed in the surface along the circumferential direction. The O-ring 10 for piping has a circular or elliptical cross-sectional shape of the annular body portion, and an inner peripheral region thereof is fitted in the O-ring groove G in advance,
Thereafter, the present invention is applied to a piping method in which each of the insertion pipes P ₁ and P ₂ is inserted into a relatively short sleeve-shaped pipe joint PC, and each end is fitted and connected.

In the O-ring 10 for piping of the present invention, the annular frame is preferably made of a solid rubber material such as styrene butadiene rubber, chloroprene rubber, ethylene propylene rubber, nitrile rubber, synthetic natural rubber, etc. in terms of elasticity, durability and moldability. Styrene butadiene rubber molded from a synthetic rubber material consisting of The inner and outer diameters of the annular skeleton of the O-ring 10 for piping of the present invention are as follows:
It is formed into various sizes depending on the size of each insertion pipe and pipe joint to be connected.

On the other hand, a lubricating heat-sealing film 11 is layered on the outer peripheral area of the annular skeleton part which is in sliding contact with the inner surface of the pipe joint PC,
The lubricating heat-sealing film 11 is preferably a powdered or sheet-shaped polyolefin resin, for example, Mitsui Petrochemical Co., Ltd.
After a polyolefin resin having a trade name of Miperon XM220 (molecular weight: 2,000,000 or more, average particle size: 25 mμ to 30 mμ) is attached to a predetermined outer peripheral area of the O-ring 10 for piping, the product is heated at about 150 ° C. for 10 minutes or more. Then, a film having a thickness of 10 μm to 100 μm is formed by fusing.

The insertion force of each of the insertion pipes P ₁ and P ₂ into which the pipe O-ring 10 having the lubricating heat-sealing film 11 is fitted in advance is reduced by the lubricating heat-sealing film. 11
It was measured that the insertion force was about half as compared with the insertion force of the O-ring for piping having no. In addition, the O-ring 10 for piping of the present invention is not limited to the connection with the insertion pipes P ₁ and P ₂ and the pipe joint PC such as the vinyl chloride pipe and the polyethylene pipe as described above, It will be readily appreciated that the invention is also applicable to concatenation. Furthermore, the O-ring 10 for piping of the present invention has an
It is also possible to insert and connect an insertion tube having a smooth outer peripheral surface into the inner peripheral region where the slippery heat-sealing film 11 is layered, while being fitted in advance in a groove recessed in the inner peripheral surface of C. It is possible.

[0016]

The O-ring for piping of the present invention having the above-described structure has the following novel effects.
That is, the pipe O-ring of the present invention is configured such that the pipe fitted into the O-ring groove recessed along the circumferential direction on the outer peripheral surface near the end of each of the insertion pipes or the inner surface of the pipe joint. In the O-ring for use, the circumference of the annular skeleton portion made of the synthetic rubber material that slides on the inner surface of the pipe joint or the outer peripheral surface near the end of each of the insertion pipes that is in sliding contact with the outer peripheral surface near the end of each of the insertion tubes Since the surface is provided with the above-mentioned slippery fusion film, even at a construction site under bad environmental conditions where dust easily occurs, the insertion resistance near the end of each of the insertion pipes with respect to the inner surface of the pipe joint is reduced. The lubricated heat-sealed film has made it possible to significantly reduce it.

Furthermore, in the O-ring for piping according to the present invention, the lubricating fusion film is formed by thermally fusing a powdery or sheet-like polyolefin resin to the peripheral surface of the annular frame. It has become possible to layer the fusible film at a desired position with a relatively uniform thickness.

Further, in the O-ring for piping according to the present invention, since the lubricating heat-sealing film is layered to a thickness of 10 μm to 100 μm, the vicinity of the end of each of the insertion pipes with respect to the inner surface of the pipe joint. It has become possible to guarantee the reduction of the insertion resistance force of the.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view in which a part of a state of an end of an insertion pipe to which a pipe O-ring according to the present invention is fitted after being connected to a pipe joint is cut and enlarged.

FIG. 2 is a partially cutaway side view showing a state before connection of an end portion of each insertion pipe fitted with a conventional pipe O-ring to a pipe joint.

FIG. 3 is a cross-sectional view showing a state in which an end portion of an insertion pipe fitted with a conventional pipe O-ring has been connected to a pipe joint, partially cut away and enlarged.

FIG. 4 is a cross-sectional view in which a part of a conventional piping O-ring is cut and enlarged.

[Explanation of symbols]

1 piping O-ring 11 slipping heat-deposit of a conventional piping O-ring G O-ring groove P ₁ inserted pipe P ₂ insertion tube PC fittings 10 present invention

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[Procedure amendment]

[Submission date] April 23, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

[0006]

SUMMARY OF THE INVENTION The object of the present invention is as follows.
In an O-ring for piping fitted in an O-ring groove recessed along the circumferential direction on an outer peripheral surface near an end of each insertion pipe or an inner surface of a pipe joint, an inner surface of the pipe joint or each of the insertion pipes Powder or sheet on the peripheral surface of an annular skeleton made of synthetic solid rubber material that slides on the outer peripheral surface near the end of the
Fused film 11 obtained by heat-sealing polyolefin resin
This is achieved by an O-ring for piping characterized by comprising:

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

[0007] Further, such an object of the present invention is to provide the above-mentioned lubricating method.
The deposition film 11 is layered to a thickness of 10 μm to 100 μm.
The O-ring for piping according to claim 1, wherein the O-ring is provided.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008]

The O-ring for piping according to the present invention is fitted in the O-ring groove recessed along the circumferential direction on the outer peripheral surface near the end of each insertion pipe or the inner surface of the pipe joint. In the O-ring for piping , a powdery or sheathed material is provided on the peripheral surface of the annular body portion made of the synthetic solid rubber material which is in sliding contact with the inner surface of the pipe joint or the outer peripheral surface near the end of each of the insertion tubes.
Fusible film formed by heat-sealing polyolefin resin
Therefore, even at a construction site under bad environmental conditions where dust is easily generated, the insertion resistance near the end of each of the insertion pipes with respect to the inner surface of the pipe joint is controlled by the slippery heat-sealing film. The lubricated heat-sealed film is significantly reduced , and
It is layered at a desired position with a relatively uniform thickness .

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

Further, in the O-ring for piping according to the present invention, since the lubricating fusion film is layered to a thickness of 10 μm to 100 μm, the vicinity of the end of each of the insertion pipes with respect to the inner surface of the pipe joint. This guarantees a reduction in the insertion resistance.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the O-ring for piping according to the present invention will be described below in detail with reference to the accompanying drawings.
Figure 1 is a cross sectional view showing an essential part of the piping O-ring 10 of the present invention, relatively long vinyl chloride tube, the outer periphery of each end near at each insertion tube P _1, P _2, such as polyethylene pipe FIG. 2 is an enlarged cross-sectional view showing a synthetic rubber piping O-ring 10 fitted in a plurality of O-ring grooves G recessed in the surface along the circumferential direction. The O-ring 10 for piping has a circular or elliptical cross-sectional shape of the annular body portion, and an inner peripheral region thereof is fitted in the O-ring groove G in advance,
Thereafter, the present invention is applied to a piping method in which each of the insertion pipes P ₁ and P ₂ is inserted into a relatively short sleeve-shaped pipe joint PC, and each end is fitted and connected.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

In the O-ring 10 for piping of the present invention, the annular skeleton is preferably made of synthetic solid rubber such as styrene butadiene rubber, chloroprene rubber, ethylene propylene rubber, nitrile rubber, synthetic natural rubber, etc. in view of elasticity, durability and moldability.
Styrene butadiene rubber, which is formed of rubber material and is inexpensive in terms of cost, is preferable. The inner and outer diameters of the annular skeleton of the O-ring 10 for piping of the present invention are formed into various sizes according to the size of each insertion pipe and pipe joint to be connected.

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction contents]

On the other hand, a lubricating heat-sealing film 11 is layered on the outer peripheral region of the annular frame portion which is in sliding contact with the inner surface of the pipe joint PC,
The lubricating heat-sealing film 11 is preferably a powdered or sheet-shaped polyolefin resin, for example, Mitsui Petrochemical Co., Ltd.
After a polyolefin resin having a trade name of Miperon XM220 (molecular weight: 2,000,000 or more, average particle size: 25 μm to 30 μm) is attached to a predetermined outer peripheral area of the O-ring 10 for piping, the product is heated at about 150 ° C. for 10 minutes or more. Then, a film having a thickness of 10 μm to 100 μm is formed by fusing.

[Procedure amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

The insertion force of each of the insertion pipes P ₁ and P ₂ into which the pipe O-ring 10 having the lubricating heat-sealing film 11 is fitted in advance is reduced by the lubricating heat-sealing film. 11
It was measured that the insertion force was about half as compared with the insertion force of the O-ring for piping having no. In addition, the O-ring 10 for piping of the present invention is not limited to the connection with the insertion pipes P ₁ and P ₂ and the pipe joint PC such as the vinyl chloride pipe and the polyethylene pipe as described above, It will be readily appreciated that the invention is also applicable to concatenation. Furthermore, the O-ring 10 for piping according to the present invention has an
It is also possible to fit in advance a groove recessed in the inner peripheral surface of the above, and to insert and connect an insertion tube having a smooth outer peripheral surface to the inner peripheral region where the slippery heat-sealing film 11 is layered. It is.

[Procedure amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction contents]

[0014]

The O-ring for piping of the present invention having the above-described structure has the following novel effects.
That is, the pipe O-ring of the present invention is configured such that the pipe fitted into the O-ring groove recessed along the circumferential direction on the outer peripheral surface near the end of each of the insertion pipes or the inner surface of the pipe joint. in use O-ring, the circumferential surface of the annular skeleton portion consisting of sliding contact the composite solid rubber <br/> arm member on the outer peripheral surface of the end portion of the inner surface or the respective insertion tube of the fitting, there powdery Shi
Fusion by heat fusion of sheet-like polyolefin resin
Because of the provision of the film 11 , even at a construction site under bad environmental conditions where dust easily occurs, the insertion resistance near the end of each of the insertion pipes to the inner surface of the pipe joint can be reduced by the slippery heat-sealing film. And the lubricated fusion film is significantly reduced
It is possible to layer at a desired position with a relatively uniform thickness
became.

[Procedure amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction contents]

Further, in the O-ring for piping according to the present invention, since the lubricating fusion film 11 is layered to a thickness of 10 μm to 100 μm, the vicinity of the end of each of the insertion pipes with respect to the inner surface of the pipe joint. It has become possible to guarantee the reduction of the insertion resistance force of the. ────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] July 2, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

[0006]

SUMMARY OF THE INVENTION The object of the present invention is as follows.
In an O-ring for piping fitted in an O-ring groove recessed along the circumferential direction on an outer peripheral surface near an end of each insertion pipe or an inner surface of a pipe joint, an inner surface of the pipe joint or each of the insertion pipes A lubricated fusion film 11 formed by thermally fusing a powdered polyolefin resin to the peripheral surface of an annular frame portion made of a synthetic solid rubber material that is in sliding contact with the outer peripheral surface in the vicinity of the end portion. This is achieved by an O-ring for piping characterized by comprising:

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008]

The O-ring for piping according to the present invention is fitted in the O-ring groove recessed along the circumferential direction on the outer peripheral surface near the end of each insertion pipe or the inner surface of the pipe joint. In the O-ring for piping, a powdery polyolefin resin is heat-fused to the inner surface of the pipe joint or to the outer peripheral surface near the end of each of the insertion pipes, which is made of the synthetic solid rubber material. Even at a construction site under poor environmental conditions where dust easily occurs, the insertion resistance near the end of each of the insertion pipes against the inner surface of the pipe joint is reduced. It is significantly reduced by the lubricating heat-sealing film, and the lubricating heat-sealing film is layered at a desired position with a relatively uniform thickness.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction contents]

[0014]

The O-ring for piping of the present invention having the above-described structure has the following novel effects.
That is, the pipe O-ring of the present invention is configured such that the pipe fitted into the O-ring groove recessed along the circumferential direction on the outer peripheral surface near the end of each of the insertion pipes or the inner surface of the pipe joint. In the O-ring for use, a powdery polyolefin resin is heat-fused to the inner surface of the pipe joint or to the outer peripheral surface near the end of each of the insertion pipes, on the peripheral surface of the annular frame portion made of the synthetic solid rubber material. Even at a construction site under bad environmental conditions where dust is easily generated, the insertion resistance near the end of each of the insertion pipes against the inner surface of the pipe joint is reduced by the above-described method. It has been significantly reduced by the lubricating heat-sealing film, and the lubricating heat-sealing film can be layered at a desired position with a relatively uniform thickness.

Claims (3)

[Claims] 1. An O-shaped recess formed along the circumferential direction on the outer peripheral surface near the end of each of the insertion pipes P ₁ and P ₂ or on the inner surface of the pipe joint PC.
In the O-ring 10 for piping fitted in the ring groove G, an annular body portion made of a synthetic rubber material that is in sliding contact with the inner surface of the pipe joint PC or the outer peripheral surface near the end of each of the insertion tubes P ₁ and P _2. An O-ring for piping characterized by comprising a lubricating fusion film 11 on the peripheral surface of the O-ring. 2. The pipe according to claim 1, wherein the lubricating fusion film is formed by thermally fusing a powdery or sheet-like polyolefin resin to a peripheral surface of the annular skeleton. ring. 3. The method according to claim 1, wherein the smooth fusion film has a thickness of 10 μm to 10 μm.
3. The O-ring for piping according to claim 2, wherein the O-ring is provided in a layer with a thickness of 0 [mu] m.