JPH10196794A - O ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the loss of an elastic repulsive force even for a long time use and to secure sealing at the time of low pressure by forming an O ring used for sealing various fluids to be annular in its side section shape having a vacant hole in its center. SOLUTION: An O ring 1 formed to be annular in its side section shape having a vacant hole 2 in its center is made of various rubber materials such as butyl rubber. Also, the O ring 1 may be formed to be a dual structure where a core material is provided in the center of its side section shape and an annular exterior material surrounding the core material is provided in the outside, and in this case, the hardness of the core material is set smaller and softer than that of the exterior material or the hardness of the core material is set larger and harder than that of the exterior material. Further, the O ring 1 may include a coil spring inserted in the vacant hole 2. Thus, the twisting of the O ring 1 during pipe inserting is reduced, the leakage of fluids thereafter is prevented, the entire O ring is made soft and thus damage to a pipe tip corner part is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an O-ring used for sealing various fluids.

[0002]

2. Description of the Related Art Conventionally, many O-rings of various sizes and various rubber materials have been used for sealing.

[0003]

However, conventional O-rings have only a solid round cross section. When an O-ring is used for a water supply pipe joint or the like, the O-ring may be damaged when a pipe is inserted into the pipe joint. The reason is that the dimensional tolerance of the water supply pipe joint and the dimensional tolerance of the pipe were relatively large, and there were also cases where burrs appeared at the pipe end corners, but the O-ring itself was slightly too hard, This was because it was difficult to escape when the corner of the pipe hit.

Another problem is that the compression rate (repulsive force / elastic force) decreases due to long-term use (constant compression), and fluid leakage easily occurs when no fluid pressure acts (at low pressure). Was.

It is an object of the present invention to effectively prevent damage even in applications that are easily damaged by pipe connection work, and to lose elasticity even after long-term use. O, which can be reliably sealed (even at low pressure)
The purpose is to provide a ring.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present invention relates to an O.D.
The ring has an annular shape having a hole in the center in cross section. Further, the cross-sectional shape is a double structure having a core material at the center and an annular exterior material surrounding the core material on the outside. In addition, there are cases where the hardness of the core material is softer and smaller than the hardness of the exterior material, and conversely, the case where the hardness of the core material is larger and harder than the hardness of the exterior material. Further, the cross-sectional shape is an annular shape having a hole at the center, and a coil spring is inserted into the hole. Alternatively, the cross-sectional shape is a solid round shape, and a coil spring is embedded therein.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the illustrated embodiment.

As shown in FIG. 1, the cross-sectional shape is an annular shape having a hole 2 at the center. Various rubber materials such as butyl rubber, nitrile rubber, and styrene rubber are preferable.
2 and 3, the O-ring 1 is fitted into the seal groove 4 of the pipe joint 3, and then the connected pipe 5 is inserted as shown by the arrow, thereby having a hole 2 inside. Therefore, as shown by the two-dot chain line from the solid line in FIG. 3, the O-ring 1 is soft and easily deformed, and the damage at the tip corner 6 of the pipe 5 is reduced. Also, the O-ring 1 is
Twisting is reduced, and the sealing performance after that is also improved.

Next, FIG. 4 shows a modification, in which the cross section has a double structure having a core material 7 at the center and an annular exterior material 8 surrounding the core material 7 on the outside. I have. At this time, if the hardness of the core material 7 is set to be smaller and softer than the hardness of the exterior material 8, the same operation and effect as those of the O-ring described with reference to FIGS. The core material 7 and the exterior material 8 may be made of various rubber materials as described above and have different hardnesses.

Next, FIG. 5 shows an embodiment, which is an O-ring having a double structure, in which the hardness of the core material 7 is set to be higher than the hardness of the exterior material 8 and hard. . By doing so, there is an advantage that the compression ratio (repulsive force / elastic force) can be prevented from lowering after long-term use (constantly compressed state).
Leakage at low pressure can be prevented (while maintaining the resilience by the core material 7 having a large internal hardness).

Next, FIGS. 6 and 7 show another embodiment. That is, the cross-sectional shape is an annular shape having the hole 2 at the center, and the coil spring 9 is inserted into the hole 2. The coil spring 9 is made of metal or plastic and has a round wire wound. Alternatively, it is also preferable to use a coil spring 9 wound with a flat wire as shown in FIG.

In FIG. 9, in the O-ring 1 in which the coil spring 9 (shown in FIGS. 6 to 8) is inserted into the hole 2,
At low pressure, the distribution of the contact surface pressure P between the mating member E (such as the inner surface of the piston rod or the cylinder tube) that closes the seal groove 4 and the O-ring 1 becomes locally large as indicated by the solid line, thereby effectively preventing leakage. Can be prevented. Note that the broken line in FIG. 9 shows the case of the conventional O-ring for comparison. When the hardness of the core material 7 is higher than that of the exterior material 8 as shown in FIG. 5, similarly to FIG.
Can be secured, and the sealing property can be maintained.

Next, as shown in the cross-sectional view of FIG. 10 and the vertical cross-sectional view of the main part of FIG. 11, the cross-sectional shape is a solid round shape, and the coil spring 9 is embedded therein. Shape
A structure is also preferable. The operation and effect in this case are similar to those of the above-described embodiment described with reference to FIG.

Next, FIG. 12 shows another method of using the O-ring shown in FIGS. 6 to 8 (or FIG. 11) and a sealing structure, that is, the "sealing groove" may be omitted. . That is,
As shown in FIG. 12 (a), there is no seal groove in the hole 12 in which the opening 12a has a slightly larger diameter, and the O-ring 1 is fitted into this hole 12 and the pipe 5 is inserted. , And the O-ring 1 are sent inward while rolling, and the (b) of FIG.
And elastically deform in the radial direction as shown in FIG. Reference numeral 13 denotes a pressing member. If the pressing member 13 is fixed with bolts or the like thereafter, the O-ring 1 is prevented from being pulled out.

In the present invention, since the coil spring 9 is provided inside, even when used for a long time, the contact surface pressure is maintained and the sealing performance is maintained. And since a seal groove can be omitted, processing of a joint etc. becomes remarkably easy.

[0016]

According to the present invention, the following significant effects can be obtained by the above-described structure. (According to claim 1 or 3) The O-ring is less likely to be twisted when the pipe 5 is inserted (as shown in FIG. 2 and FIG. 3), and the subsequent leakage of the fluid can be prevented. And,
The whole is softened, and it is possible to prevent the pipe tip corner 6 from being damaged. (According to claim 2) As a double structure, various characteristics such as torsion prevention, scratch prevention, elasticity, and creep resistance are provided.
It becomes easy to set according to use conditions, and it becomes possible to correspond to complicated specifications. (According to Claim 4 or 5 or 6) Even if the rubber material is deteriorated due to long-term use, the elasticity is hardly reduced,
In particular, it maintains reliable sealing even under low pressure.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of one embodiment of the present invention.

FIG. 2 is an explanatory diagram of a method of use.

FIG. 3 is an enlarged explanatory view of a use state.

FIG. 4 is a cross-sectional view of another embodiment of the present invention.

FIG. 5 is a cross-sectional view of another embodiment of the present invention.

FIG. 6 is a cross-sectional view of still another embodiment of the present invention.

FIG. 7 is a longitudinal sectional view of a main part thereof.

FIG. 8 is a vertical sectional view of a main part showing a modification.

FIG. 9 is an operation explanatory view.

FIG. 10 is a cross-sectional view showing still another embodiment.

FIG. 11 is a longitudinal sectional view thereof.

FIG. 12 is a diagram illustrating a method of using the present invention.

FIG. 13 is an enlarged sectional view of a main part thereof.

[Explanation of symbols]

 2 Hole 7 Core material 8 Exterior material 9 Coil spring

Claims (6)

[Claims] 1. An O-ring, wherein the cross-sectional shape is an annular shape having a hole at the center. 2. An O-ring, wherein the O-ring has a double cross-section having a core material at the center and an annular exterior material surrounding the core material on the outside. 3. The O-ring according to claim 2, wherein the hardness of the core material is set to be smaller and softer than the hardness of the exterior material. 4. The O-ring according to claim 2, wherein the hardness of the core material is set to be higher than the hardness of the exterior material. 5. An O-ring, wherein the O-ring has an annular shape having a hole in the center in cross section and a coil spring is inserted into the hole. 6. An O-shape having a cross section of a solid round shape and a coil spring embedded therein.
ring.