JP2021067296A - Annular seal material - Google Patents

Abstract

To improve sealing performance and durability to a flexible pipe.SOLUTION: An annular seal material 10 includes an annular outer peripheral part 30 and an annular inner peripheral part 32. The inner peripheral part 32 is a part to be brought into contact with a flexible pipe 14. The outer peripheral part 30 has an annular wide width part 50. The inner peripheral part 32 has an annular taper portion 70 and an annular inner peripheral end portion 72. A width of the taper portion 70 is gradually narrowed toward a position separating from the outer peripheral part 30. The inner peripheral end portion 72 is connected to a tip of the taper portion 70. The taper portion 70 has a pair of inner peripheral surfaces 90, 90. The inner peripheral surfaces 90 have inclination more than inclination of a part adjacent thereto at an outer peripheral part 30 side on any part excluding the part closest to the outer peripheral part 30.SELECTED DRAWING: Figure 2

Description

The present invention relates to an annular sealing material.

Patent Document 1 discloses a joint for a flexible pipe. A flexible pipe is connected to this flexible pipe joint. An annular sealing material is attached to the groove at the tip of the flexible tube. This flexible pipe joint includes a sleeve, a joint body, and a push ring. The sleeve is split in half in the axial direction. As a result, the sleeve can be attached to the outer circumference of the flexible tube. The outer peripheral surface of the sleeve is a tapered outer surface. A locking surface that comes into contact with the rear end surface of the sleeve and a female screw are formed on the inner peripheral surface of the push ring. The joint body has a male thread and a tapered male thread for pipes. One end of the male screw is screwed with the female screw of the push ring. The taper male thread for pipes is for joining an instrument such as a faucet or another joint. The joint body is provided with a pipe mounting portion. The tube mounting portion has an inner peripheral surface having a diameter slightly smaller than the outer shape of the O-ring.

In the flexible pipe joint disclosed in Patent Document 1, the inlet side of the pipe mounting portion is the inner surface of the taper. This tapered inner surface makes it easier for the O-ring attached to the outer peripheral groove at the end of the pipe to enter. Further, when the sleeve is pressed against the main body by the push ring, an appropriate surface pressure is generated on the outer surface of the flexible pipe on the inner surface of the taper. Further, since the annular sealing material mounted on the pipe is compressed to the small diameter side of the inner surface of the taper, the space between the pipe and the pipe mounting portion is sealed.

Jikkenhei No. 6-37686

The annular sealing material disclosed in Patent Document 1 has a problem that there is room for improvement in the sealing performance and durability of the O-ring with respect to the flexible pipe. The present invention has been made to solve this problem.

An object of the present invention is to provide an annular sealing material that improves sealing performance and durability for a flexible tube.

The annular sealing material of the present invention will be described with reference to the drawings. It should be noted that the reference numerals in the drawings are used in this column for the purpose of assisting the understanding of the contents of the invention, and are not intended to limit the contents to the illustrated range.

In order to achieve the above-mentioned object, according to a certain aspect of the present invention, the annular sealing material 10 includes an annular outer peripheral portion 30 and an annular inner peripheral portion 32. The outer peripheral portion 30 is a portion for contacting the inside 22 of the opening 20 between the inside 22 of the opening 20 and the predetermined flexible pipe 14. The opening 20 is formed by a predetermined opening forming member 12. The flexible tube 14 is inserted into the opening 20 of the opening forming member 12. In the flexible tube 14, the convex curved surface portion 26 and the concave curved surface portion 28 are repeatedly connected. The inner peripheral portion 32 is a portion for contacting the flexible pipe 14 between the inner 22 of the opening 20 and the flexible pipe 14. The outer peripheral portion 30 has an annular wide portion 50. The annular wide portion 50 is the widest and annular portion of the annular sealing material 10. The inner peripheral portion 32 has an annular tapered portion 70 and an annular inner peripheral end portion 72. The width of the tapered portion 70 becomes narrower as the distance from the outer peripheral portion 30 increases. The inner peripheral end portion 72 is connected to the tip of the tapered portion 70. The tapered portion 70 has a pair of inner peripheral surfaces 90, 90. The inclination of any portion of the inner peripheral surface 90 other than the portion closest to the outer peripheral portion 30 is equal to or greater than the inclination of the portion adjacent to the outer peripheral portion 30 side.

The width of the tapered portion 70 becomes narrower as the distance from the outer peripheral portion 30 increases. The tapered portion 70 has a pair of inner peripheral surfaces 90, 90. The inclination of any portion of the inner peripheral surface 90 other than the portion closest to the outer peripheral portion 30 is equal to or greater than the inclination of the portion adjacent to the outer peripheral portion 30 side. As a result, the tapered portion 70 has a sharp shape. When the tapered portion 70 is sharp, the portion of the annular sealing material 10 that seals the flexible pipe 14 is the portion of the tapered portion 70 that is close to the annular wide portion 50. In this case, when the portion of the inner peripheral end portion 72 or the tapered portion 70 close to the inner peripheral end portion 72 comes into contact with the concave curved surface portion 28 of the flexible pipe 14, the flexible pipe 14 is sealed even at the contacted portion. .. If sealing is possible at the inner peripheral end portion 72 or the portion of the tapered portion 70 near the inner peripheral end portion 72 in addition to the portion of the tapered portion 70 close to the annular wide portion 50, the sealing function becomes higher. On the other hand, in the tapered portion 70, the intermediate portion 100 away from the annular wide portion 50 and the inner peripheral end portion 72 is a flexible pipe 14 as compared with the portion closer to the annular wide portion 50 and the inner peripheral end portion 72 and its vicinity. Does not contribute to the seal. The reaction force received from the flexible tube 14 by the intermediate portion 100 of the seal of the flexible tube 14 is small. When the intermediate portion 100 is separated from the flexible tube 14, the intermediate portion 100 does not receive a reaction force from the flexible tube 14. If the reaction force is small or does not receive the reaction force, for example, even if the annular sealing material 10 expands due to sucking liquid, the annular sealing material 10 may be damaged by the reaction force received from the flexible pipe 14 due to the expansion. Will be low. For example, the same applies when thermal expansion of the annular sealing material 10 occurs. Less likely to break means better durability. As a result, sealing performance and durability are improved.

Further, it is desirable that the cross-sectional shape of the inner peripheral end portion 72 described above is a fan shape protruding toward the center of the annular sealing material 10.

When the cross-sectional shape of the inner peripheral end portion 72 is a fan shape protruding toward the center of the annular sealing material 10, the inner peripheral end portion 72 is more likely to come into contact with the concave curved surface portion 28 of the flexible pipe 14 as compared with the case where it is not. Become. As a result, the sealing performance is improved.

Further, it is desirable that the radius of the cross-sectional shape of the inner peripheral end portion 72 described above is smaller than the radius of curvature in the direction along the central axis of the flexible pipe 14 at the bottom of the concave curved surface portion 28 of the flexible pipe 14.

When the radius of the cross-sectional shape of the fan-shaped inner peripheral end portion 72 is smaller than the radius of curvature in the direction along the central axis of the flexible pipe 14 at the bottom of the concave curved surface portion 28 of the flexible pipe 14, the joint 12 and the flexible pipe 14 When the annular sealing material 10 is compressed between them, the inner peripheral end portion 72 tends to be in close contact with the bottom of the concave curved surface portion 28. As a result, the sealing performance is improved.

According to the present invention, the sealing performance and durability for flexible pipes are improved.

It is a figure which shows the connection state of the joint, the flexible pipe, and the annular seal material which concerns on an embodiment of this invention. It is an external view of the annular sealing material which concerns on an embodiment of this invention. It is an enlarged view of FIG. It is sectional drawing which shows the situation which the annular sealing material which concerns on a certain Embodiment of this invention is fitted in a flexible pipe. FIG. 5 is a cross-sectional view showing a situation in which an annular sealing material according to an embodiment of the present invention seals between a joint and a flexible pipe.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are designated by the same reference numerals. Their names and functions are the same. Therefore, detailed explanations about them will not be repeated.

[Structure of annular sealing material]
FIG. 1 is a diagram showing a connection state between the joint 12, the flexible pipe 14, and the annular sealing material 10 according to the present embodiment. In FIG. 1, a part of the annular sealing material 10, a part of the joint 12, and a part of the flexible pipe 14 are removed. FIG. 2 is an external view of the annular sealing material 10 according to the present embodiment. In FIG. 2, a part of the annular sealing material 10 has been removed. FIG. 3 is an enlarged view of FIG. FIG. 4 is a cross-sectional view showing a situation in which the annular sealing material 10 according to the present embodiment is fitted into the flexible pipe 14. Hereinafter, the annular sealing material 10 according to the present embodiment will be described with reference to FIGS. 1 to 4.

As shown in FIG. 1, the annular sealing material 10 according to the present embodiment is a member that seals between the joint 12 and the flexible pipe 14. The joint 12 is predetermined to be a target of sealing by the annular sealing material 10. Therefore, the annular sealing material 10 according to the present embodiment is designed on the assumption that it is inserted into the joint 12. The joint 12 forms an opening 20 and an inner peripheral surface 22 inside the opening 20. Therefore, the joint 12 is an opening forming member according to the present embodiment. The flexible pipe 14 is inserted into the opening 20 of the joint 12. In the flexible tube 14, the convex curved surface portion 26 and the concave curved surface portion 28 are repeatedly connected. The convex curved surface portion 26 is a tubular portion formed by a curved surface having a protruding central portion on the outer circumference. The concave curved surface portion 28 is a tubular portion formed by a curved surface having a concave central portion on the outer circumference. The flexible pipe 14 is also predetermined to be a target of sealing by the annular sealing material 10. Therefore, the annular sealing material 10 according to the present embodiment is designed on the assumption that it is inserted into the flexible pipe 14.

The annular sealing material 10 according to this embodiment is made of ethylene propylene diene rubber. As shown in FIG. 2, the annular sealing material 10 according to the present embodiment includes an annular outer peripheral portion 30 and an annular inner peripheral portion 32. In the case of this embodiment, the outer peripheral portion 30 and the inner peripheral portion 32 are integrated. The method for manufacturing the annular sealing material 10 according to the present embodiment is the same as that of a well-known O-ring. Therefore, the detailed procedure is not repeated.

The outer peripheral portion 30 is a portion for contacting the joint 12 between the inner peripheral surface 22 of the joint 12 and the flexible pipe 14. The outer peripheral portion 30 has an annular wide portion 50. The annular wide portion 50 means the widest and annular portion of the annular sealing material 10. The width in the present embodiment is the distance from one end to the other end in the direction along the central axis of the annular sealing material 10 (the direction in which the alternate long and short dash line extends in FIG. 2).

The inner peripheral portion 32 is a portion for contacting the flexible pipe 14 between the inner peripheral surface 22 of the joint 12 and the flexible pipe 14. In the case of the present embodiment, the inner peripheral portion 32 means a portion of the annular sealing material 10 arranged on the inner peripheral side (the side closer to the alternate long and short dash line in FIG. 2) than the annular wide portion 50.

In the case of the present embodiment, the inner peripheral portion 32 has a tapered portion 70 and an inner peripheral end portion 72. The width of the tapered portion 70 becomes narrower as the distance from the outer peripheral portion 30 increases. The inner peripheral end portion 72 is connected to the tip of the tapered portion 70. In the case of this embodiment, the tapered portion 70 has a pair of inner peripheral surfaces 90 and 90.

In the case of the present embodiment, except for the portion 114 of the inner peripheral surface 90 closest to the outer peripheral portion 30, the inclination of the arbitrary portion 110 of the inner peripheral surface 90 is the portion 112 adjacent to the portion 110 on the outer peripheral portion 30 side. Is more than the inclination of. In the case of the present embodiment, the inclination means an inclination with respect to a direction along the central axis of the annular sealing material 10 (a direction in which the alternate long and short dash line extends in FIG. 2). More specifically, as shown in FIG. 3, in the case of the present embodiment, the inclination of the arbitrary portion 110 of the inner peripheral surface 90 is set except for the portion 114 of the inner peripheral surface 90 closest to the outer peripheral portion 30. It is equal to the inclination of the portion 112 adjacent to the portion 110 on the outer peripheral portion 30 side. As a result, in the case of the present embodiment, the pair of inner peripheral surfaces 90 and 90 becomes a pair of planes.

The cross-sectional shape of the inner peripheral end portion 72 in the present embodiment is the shape of the cross-sectional shape in a plane extending along the central axis of the annular sealing material 10 (the axis indicated by the alternate long and short dash line in FIG. 2) and including the central axis. That is. In the case of this embodiment, the cross-sectional shape of the inner peripheral end portion 72 is fan-shaped. As shown in FIG. 4, in the case of the present embodiment, the radius rs is the direction along the central axis of the flexible pipe 14 at the bottom of the concave curved surface portion 28 of the flexible pipe 14 (the direction in which the alternate long and short dash line extends in FIG. 1). Is smaller than the radius of curvature rf of.

[How to connect the annular sealant]
The annular sealing material 10 according to the present embodiment seals between the joint 12 and the flexible pipe 14 in the same procedure as the well-known sealing material. That is, the annular sealing material 10 is first fitted into the concave curved surface portion 28 of the flexible pipe 14. The flexible pipe 14 in which the annular sealing material 10 is fitted in the concave curved surface portion 28 is inserted into the opening 20 of the joint 12. As a result, the annular sealing material 10 is also inserted into the opening 20 of the joint 12 together with the flexible pipe 14. Along with the insertion, the outer peripheral portion 30 of the annular sealing material 10 comes into contact with the inner peripheral surface 22 of the joint 12. As a result, the space between the joint 12 and the flexible pipe 14 is sealed.

[Explanation of the effect of this embodiment]
FIG. 5 is a cross-sectional view showing a situation in which the annular sealing material 10 according to the present embodiment seals between the joint 12 and the flexible pipe 14. The effect of the annular sealing material 10 according to the present embodiment will be described with reference to FIGS. 3 to 5. As shown in FIG. 3, the width of the tapered portion 70 becomes narrower as the distance from the outer peripheral portion 30 increases. The inner peripheral surface 90 of the tapered portion 70 is a flat surface. As a result, the tapered portion 70 has a sharper shape than the inner peripheral portion of the O-ring. As is clear from FIG. 5, when the tapered portion 70 is sharp, the portion of the annular sealing material 10 that seals the flexible pipe 14 is the portion of the inner peripheral surface 90 of the tapered portion 70 that is close to the annular wide portion 50. Moreover, in the case of the present embodiment, the inner peripheral end portion 72 comes into contact with the concave curved surface portion 28 of the flexible pipe 14. As a result, the flexible tube 14 is also sealed there. If sealing is possible at the inner peripheral end portion 72 in addition to the portion of the tapered portion 70 close to the annular wide portion 50, the sealing function becomes higher. On the other hand, in the case of the present embodiment, the intermediate portion 100 of the tapered portion 70, which is separated from the annular wide portion 50 and the inner peripheral end portion 72, is separated from the flexible pipe 14. Since the intermediate portion 100 is separated from the flexible tube 14, the intermediate portion 100 does not receive a reaction force from the flexible tube 14. If the intermediate portion 100 does not receive a reaction force, for example, even if the annular sealing material 10 expands due to sucking liquid, the joint 12 and the flexible pipe 14 due to the expansion, as compared with the case where the intermediate portion 100 receives a large reaction force. It is less likely that the annular sealing material 10 will be damaged by the reaction force received from. For example, the same applies when thermal expansion of the annular sealing material 10 occurs. Less likely to break means better durability. As a result, sealing performance and durability are improved.

Further, in the case of the present embodiment, the cross-sectional shape of the inner peripheral end portion 72 is a fan shape protruding toward the center of the annular sealing material 10. As a result, as is clear from FIG. 4, the inner peripheral end portion 72 easily comes into contact with the concave curved surface portion 28 of the flexible pipe 14. As a result, the sealing performance is further improved.

Moreover, in the case of the present embodiment, the radius rs of the fan-shaped cross-sectional shape of the inner peripheral end portion 72 is smaller than the radius of curvature rf in the direction along the central axis of the bottom of the concave curved surface portion 28 of the flexible pipe 14. .. As a result, when the annular sealing material 10 is compressed between the joint 12 and the flexible pipe 14, the inner peripheral end portion 72 easily adheres to the bottom of the concave curved surface portion 28. As a result, the sealing performance is further improved.

[Modification example]
The embodiments disclosed this time are exemplary in all respects. The scope of the present invention is not limited based on the embodiments described above. Of course, various design changes may be made to the above-described embodiment without departing from the spirit of the present invention.

For example, the target of sealing with the annular sealing material 10 is not limited to one type of joint 12. The annular sealing material 10 according to the present invention may be designed so that any of two or more types of joints 12 can be sealed. The target of sealing by the annular sealing material 10 may be a member (opening forming member) that forms an opening other than the joint 12. Similarly, the target of sealing by the annular sealing material 10 is not limited to one type of flexible tube 14. The annular sealing material 10 according to the present invention may be designed so that any of two or more types of flexible tubes 14 can be sealed.

Further, the specific shape of the inner peripheral end portion 72 is not limited to that described above. When the cross-sectional shape of the inner peripheral end portion 72 is fan-shaped, the radius rs thereof is not particularly limited.

Further, the inner peripheral surface 90 is not limited to a flat surface. For example, the inner peripheral surface 90 may be a concave curved surface.

10 ... annular sealing material 12 ... joint 14 ... flexible pipe 20 ... opening 22 ... inner peripheral surface 26 ... convex curved surface portion 28 ... concave curved surface portion 30 ... outer peripheral portion 32 ... inner peripheral portion 50 ... annular wide portion 70 ... tapered portion 72 ... Inner peripheral end 90 ... Inner peripheral surface 100 ... Midway 110, 112, 114 ...

Claims (3)

A portion for contacting the opening forming member between the inside of the opening of the predetermined opening forming member forming the opening and the predetermined flexible tube inserted into the opening and in which the convex curved surface portion and the concave curved surface portion are repeatedly connected. The outer peripheral part of the ring, which is
An annular sealing material including an annular inner peripheral portion which is a portion for contacting the flexible tube between the inside of the opening and the flexible tube.
The outer peripheral portion has an annular wide portion which is the widest and annular portion of the annular sealing material.
The inner peripheral part is
An annular tapered portion whose width becomes narrower as the distance from the outer peripheral portion increases.
It has an annular inner peripheral end portion connected to the tip of the tapered portion, and has an annular inner peripheral end portion.
An annular sealing material, wherein the tapered portion has a pair of inner peripheral surfaces whose inclination of any portion other than the portion closest to the outer peripheral portion is equal to or greater than the inclination of the adjacent portion on the outer peripheral portion side. The annular sealing material according to claim 1, wherein the cross-sectional shape of the inner peripheral end portion is a fan shape protruding toward the center of the annular sealing material. The annular shape according to claim 2, wherein the radius of the cross-sectional shape of the inner peripheral end portion is smaller than the radius of curvature of the bottom of the concave curved surface portion of the flexible tube in a direction along the central axis of the flexible tube. Sealing material.

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