JP6594160B2 - Sealing material and pipe fittings - Google Patents

Description

  The present invention relates to a sealing material and a pipe joint including the sealing material.

  Conventionally, as this type of pipe joint, for example, as shown in FIGS. 7 and 8, a rubber that inserts an insertion port 101 into a receiving port 102 and seals between the inner surface of the receiving port 102 and the outer surface of the inserting port 101. Some have an annular sealing material 103 made of metal. The seal material 103 has a heel portion 105 fitted in a locking groove 104 formed on the inner surface of the receiving port 102, and a valve portion 106 compressed between the inner surface of the receiving port 102 and the outer surface of the insertion port 101. is doing. A concave portion 107 is formed in the valve portion 106.

  According to this, as shown in FIG. 7, when the water pressure in the pipe acts on the valve portion 106, the radially inward pressing force F <b> 1 acts on the valve portion 106 due to the water pressure P acting on the surface 107 a of the recess 107. The sealing performance between the inner surface of the valve portion 106 and the outer surface of the insertion port 101 is improved.

  In addition, the pipe joint using the above sealing materials 103 is described in the following patent document 1, for example.

JP2009-275787A

  However, in the above conventional type, particularly when the water pressure P is high, the valve portion 106 is deformed inward in the radial direction by the pressing force F1, and the sealing performance between the outer surface of the valve portion 106 and the inner surface of the receiving port 102 is improved. There is a problem that it falls.

  The present invention ensures a sufficient sealing performance between the inner surface of the valve portion and the outer surface of the insertion port, and a sufficient sealing performance between the outer surface of the valve portion and the inner surface of the receiving port. The object is to provide materials and pipe joints.

In order to achieve the above object, the first invention is used in a pipe joint in which an insertion port is inserted into a receiving port, and is made of an elastic material that seals between the inner surface of the receiving port and the outer surface of the insertion port. A sealing material,
A heel portion that is fitted in a locking groove formed on the inner surface of the receiving port, and a valve portion that is compressed between the inner surface of the receiving port and the outer surface of the insertion port,
The valve portion has an outer surface, a tapered inner surface that is reduced in diameter toward the back of the receiving port, and an end surface on the back of the receiving port,
The end surface on the back side of the receiving port is formed along the radial direction across the end portion on the back side of the receiving port on the outer surface and the end portion on the back side of the inner surface, and the cross section is V-shaped toward the receiving port opening side. It consists of a recess recessed,
The valve portion has an outer peripheral side lip portion formed on the outer peripheral side of the concave portion and an inner peripheral side lip portion formed on the inner peripheral side of the concave portion ,
A rear side protrusion that protrudes inward in the radial direction from the inner surface of the valve part is formed at the inner end of the receiving port on the inner side of the valve part.
The inner peripheral surface of the rear side protrusion is formed linearly in the tube axis direction,
The valve portion has a straight straight portion on the outer surface in the tube axis direction,
The straight portion of the outer surface of the valve portion constitutes the outer surface of the outer peripheral lip portion,
The recess is opened to the back side of the receiving port, has a bent bottom at one location, and extends from the bent bottom to the receiving port back side end of the inner peripheral surface of the back side protrusion and from the bent bottom to the outer surface of the valve unit. The distance from the straight portion of the straight portion to the end on the back side is formed in a straight line .

  According to this, when the heel part of the sealing material is fitted into the locking groove of the receiving port, the sealing material is mounted in the receiving port, the insertion port is inserted into the receiving port and the pipes are joined together, the valve part of the sealing material Is compressed between the inner surface of the receiving port and the outer surface of the insertion port, the recess is opened on the back side of the receiving port, the fluid in the pipe reaches the recess of the sealing material, and the fluid pressure acts in the recess Then, since the radially inward pressing force acts on the inner peripheral lip portion of the valve portion, the sealing performance (self-sealing effect) between the inner surface of the valve portion and the outer surface of the insertion port is improved, and the valve portion Since a radially outward pressing force acts on the outer peripheral side lip portion, the sealing performance (self-sealing effect) between the outer surface of the valve portion and the inner surface of the receiving port is improved.

As a result, it is possible to sufficiently ensure the sealing performance between the inner surface of the valve portion and the outer surface of the insertion port, and to sufficiently ensure the sealing performance between the outer surface of the valve portion and the inner surface of the receiving port .

In addition, with the insertion port inserted into the receiving port, the axial center of the receiving port and the axial center of the insertion port are displaced in the radial direction, and the interval between the inner surface of the receiving port and the outer surface of the insertion port is greater than a predetermined interval. Even if it becomes wider, the back projection of the sealing material is in pressure contact with the outer surface of the insertion port, so that fluid in the pipe is prevented from leaking from between the sealing material and the outer surface of the insertion port. Can do.

In the sealing material according to the second aspect of the present invention, the recess has a recessed end surface on the back side of the receptacle bent into a V shape,
The length in the radial direction from the bent bottom on the opening side of the recess to the inner peripheral end of the inner peripheral lip is longer than the length in the radial direction from the bent bottom to the outer peripheral end of the outer peripheral lip. It is.

  According to this, since the length of the inner peripheral lip portion is longer than the length of the outer peripheral lip portion, the inner peripheral lip portion is prevented from being pushed and deformed by fluid pressure and jumping out to the receiving opening side. be able to.

The third invention is a pipe joint provided with the sealing material according to the first invention or the second invention ,
The insertion is inserted into the receptacle,
A locking groove is formed on the inner surface of the receiving port,
The heel part of the sealing material is fitted in the locking groove,
The concave portion is opened on the back side of the receiving port in a state where the valve portion of the sealing material is compressed between the inner surface of the receiving port and the outer surface of the insertion port.

  According to this, it is possible to sufficiently ensure the sealing performance between the inner surface of the valve portion and the outer surface of the insertion port, and to sufficiently ensure the sealing performance between the outer surface of the valve portion and the outer surface of the insertion port.

  As described above, according to the present invention, the sealing performance between the inner surface of the valve portion and the outer surface of the insertion port is sufficiently ensured, and the sealing performance between the outer surface of the valve portion and the outer surface of the insertion port is sufficiently ensured. can do.

It is sectional drawing of the pipe joint in the 1st Embodiment of this invention. It is a partially expanded sectional view of a pipe joint. It is an expanded sectional view of the sealing material used for a pipe joint, and shows the natural state before attaching to a pipe joint. It is an expanded sectional view which shows the mode of a deformation | transformation of a sealing material when the insertion port is inserted in the receptacle of a pipe joint similarly. FIG. 4 is a partially enlarged cross-sectional view of the pipe joint, showing a state where the interval between the insertion port and the receiving port is wider than a predetermined interval. It is an expanded sectional view of the sealing material used for the pipe joint in the 2nd Embodiment of this invention, and shows the natural state before attaching to a pipe joint. It is a partially expanded sectional view of the conventional pipe joint. It is an expanded sectional view of the sealing material used for a pipe joint similarly.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
In the first embodiment, as shown in FIGS. 1 and 2, reference numeral 1 denotes a detachment prevention pipe joint, and a receiving port 3 formed at the end of one cast iron pipe 2 connected to each other, An insertion slot 5 formed at the end of the other cast iron pipe 4 is inserted.

  On the inner surface of the receiving port 3, a locking groove 10 and a lock ring groove 11 positioned on the deeper side of the receiving port than the locking groove 10 are formed over the entire circumference. A lock ring 13 is fitted in the lock ring groove 11 via a centering member 12.

  The centering member 12 is an annular member made of resin for holding and centering the lock ring 13. Further, the lock ring 13 is a piece of metal ring divided at one place in the circumferential direction, and has an elastic diameter reducing force so as to be elastically held on the outer surface of the insertion slot 5. It is configured.

  An insertion projection 15 is formed on the outer periphery of the distal end of the insertion slot 5 over the entire circumference. The insertion projection 15 is formed at a position away from the distal end surface of the insertion port 5 by a predetermined distance L in the tube axis direction A. The insertion port 5 is prevented from being detached from the receiving port 3 by engaging the insertion port projection 15 with the lock ring 13 from the receiving port back side.

Inside the receiving port 3 and between the opening end of the receiving port 3 and the lock ring 13, a sealing material 18 is provided for sealing between the inner surface of the receiving port 3 and the outer surface of the insertion port 5.
The seal material 18 is an annular member made of an elastic material such as rubber, and is a valve that is compressed between the heel portion 19 fitted in the locking groove 10, and the inner surface of the receiving port 3 and the outer surface of the insertion port 5. Part 20.

  FIG. 3 shows a single seal material 18 in a natural state before being attached to the pipe joint 1. The valve unit 20 has an outer surface 22, an inner surface 23, and an end surface 24 on the back side of the receiving port over the entire circumference. The inner surface 23 is a tapered surface having a diameter reduced toward the back of the receiving port. A rear-side protrusion 25 that protrudes radially inward from the inner surface 23 is formed on the entire inner periphery of the inner end of the receiving port. In addition, the inner peripheral surface of the back side protrusion 25 is formed in a straight line shape in the tube axis direction A.

  The end surface 24 on the back side of the receiving port extends along the radial direction B across the receiving port back side end portion and the back side protrusion 25 of the outer surface 22. Further, the end surface 24 on the back side of the receiving port has a concave portion 27 whose cross section is bent and bent into a V shape toward the receiving port opening side. The recess 27 is opened on the back side of the receiving opening.

  The valve portion 20 has an outer peripheral lip portion 29 formed on the outer peripheral side of the concave portion 27 and an inner peripheral lip portion 30 formed on the inner peripheral side of the concave portion 27 over the entire circumference. . The bending angle C of the bent bottom 27a on the opening side of the recess 27 is 90 ° or more and less than 180 °.

  Further, the length Li in the radial direction B from the bent bottom portion 27a to the inner peripheral end of the inner peripheral lip portion 30 is longer than the length Lo in the radial direction B from the bent bottom portion 27a to the outer peripheral end of the outer peripheral lip portion 29. long.

  The valve portion 20 has a recessed portion 32 that is recessed radially inward and a straight portion 33 that is linear in the tube axis direction A on the outer surface 22. Among these, the recessed part 32 is formed over the perimeter between the heel part 19 and the straight part 33. Further, as shown in FIG. 2, in a state where the valve portion 20 is fitted in the receiving port 3, the straight portion 33 is in surface contact with the inner surface of the receiving port 3 in an uncompressed state.

  As shown by a thick hatched portion in FIG. 3, the heel portion 19 is made of a high hardness member 19a (for example, hard rubber) having a higher hardness than the valve portion 20, and as shown by a thin hatched portion in FIG. Consists of a low hardness member 20a (for example, soft rubber) having a lower hardness than the heel portion 19. The boundary surface 35 between the high-hardness member 19 a and the low-hardness member 20 a has an outer peripheral end that reaches the recess 32 of the outer surface 22 of the valve portion 20, and an inner peripheral end that reaches the inner surface 23.

  As shown in FIG. 1, the lock ring 13 is fitted into the lock ring groove 11 in the receiving port 3 through the centering member 12, and the heel portion 19 of the sealing material 18 is fitted into the locking groove 10 in the receiving port 3. In the state where the insertion port 5 is inserted into the receiving port 3 and the one tube 2 and the other tube 4 are joined, the valve portion 20 of the sealing material 18 is connected to the receiving port 3 as shown in FIG. It is compressed and deformed between the inner surface and the outer surface of the insertion slot 5, and the recess 27 is opened on the back side of the receiving opening.

Hereinafter, the operation of the above configuration will be described.
As shown in FIG. 1, the lock ring 13 is fitted into the lock ring groove 11 in the receiving port 3 through the centering member 12, and the heel portion 19 of the sealing material 18 is fitted into the locking groove 10 in the receiving port 3. It inserts, the insertion port 5 is inserted in the receiving port 3, and the one pipe | tube 2 and the other pipe | tube 4 are joined.

  When the insertion port 5 is inserted into the receiving port 3, as shown in FIG. 4, the distal end portion of the insertion port 5 abuts on the valve unit 20 of the sealing material 18 and pushes the valve unit 20 toward the back side of the receiving port. At this time, since the valve portion 20 has the V-shaped concave portion 27, the inner peripheral lip portion 30 easily falls to the back side of the receiving port, and the joining force required when the insertion port 5 is inserted into the receiving port 3. An increase in (pushing force) can be suppressed. In particular, the insertion protrusion 15 of the insertion port 5 is effective in suppressing an increase in bonding force when the inner periphery of the valve unit 20 passes from the opening side of the receiving port 3 to the back side.

  The pipes 2 and 4 are joined to each other as described above, and the concave portion 27 is formed on the back side of the receiving port in a state where the valve portion 20 of the sealing material 18 is compressed between the inner surface of the receiving port 3 and the outer surface of the insertion port 5. It is open. As shown in FIG. 2, when water (an example of a fluid) in the pipes 2 and 4 reaches the concave portion 27 of the sealing material 18 and the water pressure P acts on the concave portion 27, the inner peripheral lip portion of the valve portion 20. Since the radially inward pressing force F1 acts on 30, the sealing performance (self-sealing effect) between the inner surface of the valve portion 20 and the outer surface of the insertion slot 5 is improved, and the outer peripheral lip portion 29 of the valve portion 20 is improved. Since the radially outward pressing force F2 acts on the sealing member, the sealing performance (self-sealing effect) between the outer surface of the valve portion 20 and the inner surface of the receiving port 3 is improved.

  Thereby, the sealing performance (self-sealing effect) between the inner surface of the valve portion 20 and the outer surface of the insertion port 5 is sufficiently secured, and the sealing performance between the outer surface of the valve portion 20 and the inner surface of the receiving port 3 ( A sufficient self-sealing effect) can be secured.

  As shown in FIG. 3, since the bending angle C of the bent bottom 27a of the recess 27 is 90 ° or more and less than 180 °, the radial direction B is between the inner peripheral lip 30 and the outer peripheral lip 29. Therefore, the self-sealing effect as described above is easily exhibited.

  Further, as shown in FIG. 5, with the insertion port 5 inserted into the receiving port 3, the axial center of the receiving port 3 and the axial center of the insertion port 5 are displaced in the radial direction B, and the inner surface of the receiving port 3 Even when the interval D between the outer surface of the insertion port 5 is larger than a predetermined (regular) interval, the back-side protrusion 25 of the sealing material 18 is in pressure contact with the outer surface of the insertion port 5, so that the pipe It is possible to prevent the water in 2 and 4 from leaking from between the sealing material 18 and the outer surface of the insertion slot 5. At this time, since the inner peripheral surface of the rear projection 25 is formed in a straight line in the tube axis direction A, sufficient surface pressure is ensured at the contact portion between the rear projection 25 and the outer surface of the insertion slot 5. As a result, the sealing performance is improved.

  Further, when the heel portion 19 is fitted in the locking groove 10 and the sealing material 18 is mounted in the receiving port 3, the straight portion 33 of the valve portion 20 is in surface contact with the inner surface of the receiving port 3 in an uncompressed state. The valve portion 20 is positioned in the radial direction B, and the displacement of the valve portion 20 can be prevented.

  Also, as shown in FIG. 3, the length Li of the inner peripheral lip portion 30 is longer than the length Lo of the outer peripheral lip portion 29, so that the tubes 2 and 4 are joined together as shown in FIGS. In this state, it is possible to prevent the inner peripheral lip portion 30 from being pushed and deformed by water pressure and jumping out to the opening side of the receiving port 3. Furthermore, when the length Li is longer than the length Lo as described above, when the insertion port 5 is inserted into the receiving port 3, the inner peripheral lip portion 30 is liable to fall to the back side of the receiving port. It is possible to suppress an increase in the bonding force required when inserting the material into the receiving port 3.

  In the first embodiment, the recess 27 is formed in a V shape as shown in FIG. 3, but as a second embodiment, as shown in FIG. The bent bottom 27a may be arcuate. Note that the operation and effect similar to those of the first embodiment can be obtained for the recess 27 as shown in FIG.

  In the first embodiment, as shown in FIG. 3, the hollow portion 32 and the straight portion 33 are formed on the outer surface 22 of the valve portion 20 of the sealing material 18. Only the portion 33 may be formed, and the outer surface 22 of the valve portion 20 may be an annular surface having no unevenness.

  In this case, when the heel portion 19 is fitted into the locking groove 10 and the sealing material 18 is mounted inside the receiving port 3, the outer surface of the valve portion 20 faces the inner surface of the receiving port 3 over the entire range of the straight portion 33. Contact. For this reason, the sealing material 18 is more stably mounted inside the receiving port 3.

  The embodiment described above is merely a specific example of the present invention, and the scope of the present invention is not limited by the description. The specific shape, size, material, and the like of the sealing material are the same as those of the present invention. The design can be changed as appropriate within the range in which the effect is achieved.

DESCRIPTION OF SYMBOLS 1 Pipe joint 3 Receptacle 5 Insertion 10 Locking groove 18 Sealing material 19 Heel part 20 Valve part 22 Outer surface 23 Inner surface 24 End face 25 of receiving end Deep side protrusion 27 Recessed part 27a Bent bottom part 29 Outer peripheral side lip part 30 Peripheral lip portion 33 Straight portion A Pipe axis direction B Radial direction C Bending angle Li Radial length Lo from the bent bottom portion to the inner peripheral end of the inner peripheral lip portion From the bent bottom portion to the outer peripheral end of the outer peripheral lip portion Length in radial direction

Claims (3)

An annular sealing material made of an elastic material that is used for a pipe joint in which an insertion port is inserted into a receiving port and seals between the inner surface of the receiving port and the outer surface of the insertion port,
A heel portion that is fitted in a locking groove formed on the inner surface of the receiving port, and a valve portion that is compressed between the inner surface of the receiving port and the outer surface of the insertion port,
The valve portion has an outer surface, a tapered inner surface that is reduced in diameter toward the back of the receiving port, and an end surface on the back of the receiving port,
The end surface on the back side of the receiving port is formed along the radial direction across the end portion on the back side of the receiving port on the outer surface and the end portion on the back side of the inner surface, and the cross section is V-shaped toward the receiving port opening side. It consists of a recess recessed,
The valve portion has an outer peripheral side lip portion formed on the outer peripheral side of the concave portion and an inner peripheral side lip portion formed on the inner peripheral side of the concave portion ,
A rear side protrusion that protrudes inward in the radial direction from the inner surface of the valve part is formed at the inner end of the receiving port on the inner side of the valve part.
The inner peripheral surface of the rear side protrusion is formed linearly in the tube axis direction,
The valve portion has a straight straight portion on the outer surface in the tube axis direction,
The straight portion of the outer surface of the valve portion constitutes the outer surface of the outer peripheral lip portion,
The recess is opened to the back side of the receiving port, has a bent bottom at one location, and extends from the bent bottom to the receiving port back side end of the inner peripheral surface of the back side protrusion and from the bent bottom to the outer surface of the valve unit. A space between the straight portion of the straight portion and the end on the back side is formed linearly . The recess has an end face on the back side that is bent into a V shape and is recessed,
The radial length from the bent bottom portion to the inner peripheral end of the inner peripheral lip portion on the opening side of the concave portion is longer than the radial length from the bent bottom portion to the outer peripheral end of the outer peripheral lip portion of the concave portion. The sealing material according to claim 1 . A pipe joint comprising the sealing material according to claim 1 or 2,
The insertion is inserted into the receptacle,
A locking groove is formed on the inner surface of the receiving port,
The heel part of the sealing material is fitted in the locking groove,
A pipe joint characterized in that a recess is opened on the back side of the receiving port in a state where the valve portion of the sealing material is compressed between the inner surface of the receiving port and the outer surface of the insertion port.

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