JP6590626B2 - 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 a pipe joint provided with this kind of sealing material, there is a slip-on type having a function of preventing separation as shown in FIG. 9, for example. In this pipe joint 101, a rubber annular sealing material 104 that seals between the inner surface of the receiving port 103 and the outer surface of the inserting port 102 is inserted into the receiving port 103. Is provided.

  Further, a lock ring 105 is provided inside the receiving port 103 and on the back side of the sealing material 104. An insertion protrusion 106 is formed on the outer periphery of the insertion opening 102, and the insertion protrusion 106 can be engaged with the lock ring 105 from the back of the receiving opening.

  A locking groove 107 is formed on the inner surface of the receiving port 103, and the sealing material 104 is compressed between the heel portion 108 fitted in the locking groove 107, and the inner surface of the receiving port 103 and the outer surface of the insertion port 102. And a valve portion 109.

  As shown in FIG. 10, the valve portion 109 has an outer surface 110, a tapered inner surface 111 having a diameter reduced toward the back of the receiving port, and an end surface 112 on the back of the receiving port. Further, the inner surface 111 is formed with a rear side protrusion 113 that protrudes radially inward from the inner surface 111.

  According to this, the sealing member 104 and the lock ring 105 are mounted inside the receiving port 103, and the valve portion 109 is inserted into the receiving port 103 so that the valve portion 109 is connected to the inner surface of the receiving port 103 and the outer surface of the inserting port 102. And the space between the inner surface of the receiving port 103 and the outer surface of the insertion port 102 is sealed.

  In addition, the above pipe joint 101 is described in the following patent document 1, for example.

JP-A-5-231570

  However, in the above-described conventional format, the valve portion 109 is compressed in the radial direction B, with the entire portion including the rear-side protrusion 113 sandwiched between the inner surface of the receiving port 103 and the outer surface of the insertion port 102. For this reason, there exists a problem that the joining force (pressing force) required when inserting the insertion slot 102 in the receptacle 103 increases.

  An object of this invention is to provide the sealing material and pipe joint which can suppress the increase in the joining force required when inserting an insertion port in a receptacle.

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 heel part consists of a high hardness member that is harder than the valve part,
The valve portion includes a low hardness member having a lower hardness than the heel portion,
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 heel portion has a protrusion protruding radially outward from the outer surface of the valve portion,
The outer surface of the valve portion is an annular surface that is straight and formed in the tube axis direction, with no irregularities except for the protrusion of the heel portion.
The outer peripheral end of the boundary surface between the high hardness member and the low hardness member reaches the outer surface of the valve portion, and the high hardness member constitutes a part of the outer surface of the valve portion,
A rear-side protrusion that protrudes radially inward from the inner surface of the valve portion is formed at the inner end of the valve portion on the inner side of the receiving port.
The end surface on the back side of the receiving port is formed along the radial direction across the outer end of the receiving port and the rear side protrusion,
In the state where the insertion port is inserted into the receiving port, a gap opened to the back side of the receiving port is formed between the inner surface of the receiving port and the end surface on the back side of the receiving port of the valve unit, and the rear side protruding portion Is formed between the gap and the outer surface of the insertion slot in the radial direction.

  According to this, the heel portion is fitted into the locking groove, the sealing material is mounted inside the receiving port, and the insertion port is inserted into the receiving port. At this time, the valve portion is pushed by the insertion port and deforms to the back side of the receiving port, a gap is formed between the inner surface of the receiving port and the end surface of the receiving side of the valve portion, and the back side protruding portion is formed. Is located between the gap and the outer surface of the insertion slot in the radial direction.

  As a result, a portion between the outer surface and the inner surface of the valve portion is sandwiched between the inner surface of the receiving port and the outer surface of the insertion port and compressed in the radial direction. By being present, it is not sandwiched between the inner surface of the receiving port and the outer surface of the insertion port and is not compressed in the radial direction. Thereby, the increase in the joining force required when inserting the insertion port into the receiving port can be suppressed.

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 wide, the back side protrusion 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.
Further, the sealing material is stably mounted inside the receiving port.

In the sealing material according to the second aspect of the invention, the end surface on the back side of the receiving port is formed in an arc shape having a predetermined radius that swells on the back side of the receiving port in the cross section .

In the sealing material according to the third aspect of the invention , the contact portion between the inner surface of the valve portion and the outer surface of the insertion port is in the state where the insertion port is inserted into the receiving port, and the outer surface of the valve portion and the inner surface of the receiving port It extends from the contact portion to the back of the receptacle .

A fourth aspect of the present invention is a pipe joint including the sealing material according to any one of the first to third aspects of the 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 valve portion of the sealing material is compressed between the inner surface of the receiving port and the outer surface of the insertion port,
The end face on the back side of the valve part is inclined so that the diameter decreases toward the back side,
A gap is formed between the inner surface of the receiving port and the end surface on the back side of the receiving port of the valve portion,
The gap is open to the back of the receptacle,
The formation part of the back side protrusion is located between the gap and the outer surface of the insertion opening in the radial direction.

  According to this, when the fluid in the pipe flows into the gap between the inner surface of the receiving port and the end surface on the back side of the valve unit, fluid pressure acts on the end surface on the back side of the receiving port of the valve unit. Since a pressing force that presses the portion radially inward is generated, the valve portion comes into pressure contact with the outer surface of the insertion opening, and a sufficient surface pressure required for sealing can be obtained.

In the pipe joint according to the fifth aspect of the present invention, the insertion protrusion is formed on the outer surface of the insertion opening,
A lock ring is provided inside the receiving port and on the back side of the sealing material,
The insertion protrusion can be engaged with the lock ring from the back of the receiving opening.

  According to this, it is possible to prevent the insertion port from being inadvertently detached from the receiving port by engaging the locking projection of the insertion port inserted into the receiving port from the back side of the receiving port. .

  As described above, according to the present invention, it is possible to suppress an increase in bonding force required when the insertion port is inserted into the receiving port.

It is sectional drawing of the pipe joint in 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 similarly, and shows the natural state before attaching to a pipe joint. It is an expanded sectional view of the sealing material used for a pipe joint, and hatching is deleted from the expanded sectional view shown in FIG. It is an expanded sectional view of the sealing material with which the opening was similarly attached. It is an expanded sectional view which shows the mode of a deformation | transformation of a sealing material when inserting an insertion port into a receiving port similarly. It is an expanded sectional view which shows the mode of a deformation | transformation of a sealing material when inserting an insertion port into a receiving port 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 sectional drawing of the conventional pipe joint. It is an expanded sectional view of the sealing material used for a pipe joint similarly, and shows the natural state before attaching to a pipe joint.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
As shown in FIG. 1, reference numeral 1 denotes a detachment prevention pipe joint, which is connected to the receiving port 3 formed at the end of one cast iron pipe 2 connected to the other, and to the end of the other cast iron pipe 4. The formed insertion slot 5 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 surface of the distal end of the insertion port 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 protrusion 15 with the lock ring 13 from the back side of the receiving port.

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 sealing 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.

  3 and 4 show 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. 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.

  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. In addition, the end surface 24 on the back side of the receiving port is formed in an arc shape having a predetermined radius r1 that slightly swells on the back side of the receiving port in the cross section.

  An arcuate back side corner surface 28 having a predetermined radius r2 is formed at a corner portion between the outer surface 22 and the end surface 24 on the back side of the receiving port. The position of the back-side protrusion 25 and the position of the back-side corner surface 28 are the same in the tube axis direction A. In addition, the position of the back side protrusion 25 and the position of the back side corner surface 28 may not be exactly the same in the tube axis direction A, and at least a part thereof may overlap.

  The rear-side protrusion 25 has an inner end top portion 26 that is flat in the tube axis direction A at the inner end over the entire circumference. The inner end top portion 26 is included in the formation range D of the rear corner surface 28 in the tube axis direction A.

  The heel portion 19 protrudes outward in the radial direction B from the outer surface 22 of the valve portion 20. The outer diameter C of the valve portion 20 is constant in the range between the heel portion 19 and the rear corner surface 28, and the outer surface 22 is an annular surface that is straight and formed in the tube axis direction A without any irregularities. is there.

  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 30 between the high hardness member 19 a and the low hardness member 20 a has an outer peripheral end that reaches the outer surface 22 of the valve portion 20, and an inner peripheral end that reaches the inner surface 23.

  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 as shown in FIG. 6 and 7, the insertion port 5 is inserted into the receiving port 3, and in the state where one pipe 2 and the other pipe 4 are joined as shown in FIG. 1, the valve of the sealing material 18. The portion 20 is compressed and deformed between the inner surface of the receiving port 3 and the outer surface of the insertion port 5, and the end surface 24 on the back side of the receiving portion of the valve portion 20 is inclined so that the diameter decreases toward the back side of the receiving port. A gap 31 is formed between the inner surface of the port 3 and the end surface 24 on the back side of the receiving port of the valve portion 20.

  As shown in FIGS. 1 and 2, the gap 31 is open on the back side of the receiving port and is enlarged in the radial direction B toward the back side of the receiving port. And the formation location E of the back side protrusion 25 of the valve | bulb part 20 is located in the radial direction B between the said gap | interval 31 and the outer surface of the insertion port 5. FIG.

In addition, the contact portion between the inner surface of the valve portion 20 and the outer surface of the insertion port 5 extends in the tube axis direction A further to the rear side of the receiving port than the contact portion between the outer surface of the valve portion 20 and the inner surface of the receiving port 3. Yes.
Hereinafter, the operation of the above configuration will be described.

  When one tube 2 and the other tube 4 are joined, first, the lock ring 13 is fitted into the lock ring groove 11 in the receiving port 3 through the centering member 12, and as shown in FIG. The heel portion 19 of the material 18 is fitted into the locking groove 10 in the receiving port 3, and the lock ring 13 and the sealing material 18 are mounted inside the receiving port 3.

  At this time, since the arc-shaped back side corner surface 28 is formed at the corner portion of the outer surface 22 of the valve portion 20 of the sealing material 18 and the end surface 24 on the back side of the receiving port, the sealing material 18 is disposed inside the receiving port 3. When being attached, the sealing material 18 can be smoothly inserted into the interior of the receptacle 3 from the opening end of the receptacle 3.

  Thereafter, as shown in FIGS. 6 and 7, the insertion slot 5 is inserted into the receiving slot 3. At this time, the distal end of the insertion slot 5 comes into contact with the inner surface 23 of the sealing material 18, and the valve portion 20 is pushed by the insertion slot 5 to be deformed to the inner side of the reception opening. As shown in FIGS. 3 is formed between the inner surface of the valve portion 20 and the end face 24 on the back side of the valve portion 20, and the formation point E of the rear-side protrusion 25 is formed between the gap 31 and the outer surface of the insertion port 5 in the radial direction B. Located between.

  Thereby, the portion between the outer surface 22 and the inner surface 23 of the valve portion 20 is sandwiched between the inner surface of the receiving port 3 and the outer surface of the insertion port 5 and compressed in the radial direction B, but the rear side protruding portion 25. The formation portion E is not sandwiched between the inner surface of the receiving port 3 and the outer surface of the insertion port 5 due to the presence of the gap 31 and is not compressed in the radial direction B. Thereby, increase of the joining force (pushing force) required when inserting the insertion port 5 into the receiving port 3 can be suppressed.

  Further, as shown in FIG. 8, the axial center of the receiving port 3 and the axial center of the insertion port 5 are displaced in the radial direction, and the interval 6 between the inner surface of the receiving port 3 and the outer surface of the insertion port 5 is larger than a predetermined interval. Even when the width of the seal member 18 is increased, the back side protrusion 25 of the seal member 18 is in pressure contact with the outer surface of the insertion port 5, so that water (an example of fluid) in the pipes 2 and 4 is inserted into the seal member 18. It is possible to prevent leakage from between the outer surface of the mouth 5. In addition, with the back side protrusion part 25, while being able to obtain favorable water stop, the increase in the joining force required when inserting the insertion port 5 in the receiving port 3 can be suppressed.

  Further, as shown in FIG. 2, the end surface 24 on the back side of the valve portion 20 is inclined so that the diameter decreases toward the back side of the receiving portion, and the inner surface of the receiving port 3 and the back side of the receiving portion of the valve portion 20. When water in the pipes 2 and 4 flows into the gap 31 between the end face 24 and the end face 24, water pressure P (an example of fluid pressure) acts on the end face 24 on the back of the receiving port, and the valve portion 20 is moved radially inward. Since the pressing force F that presses the valve portion 20 is generated, the valve portion 20 comes into pressure contact with the outer surface of the insertion slot 5 and a sufficient surface pressure required for sealing can be obtained.

  At this time, the hydraulic pressure P also generates a pressing force (not shown) that presses the valve portion 20 along the tube axis direction A from the receiving port back side to the opening end side of the receiving port 3. Since the heel portion 19 formed of the high hardness member 19a fitted in 10 restricts the movement of the valve portion 20, the valve portion 20 becomes a force spreading in the radial direction B, and the surface pressure is further increased to improve the water stoppage. Can do.

  Further, as shown in FIG. 1, when the insertion protrusion 15 of the insertion opening 5 inserted into the reception opening 3 is engaged with the lock ring 13 from the rear side of the reception opening 5, the insertion opening 5 is not connected to the reception opening 3. It is possible to prevent the withdrawal.

  As shown in FIG. 2, the outer surface 22 of the valve portion 20 of the sealing material 18 is in surface contact with the inner surface of the receiving port 3 over a wide range from the heel portion 19 to the rear corner surface 28. For this reason, the sealing material 18 is stably attached to the inside of the receiving port 3, and deformation of the outer peripheral portion of the valve unit 20 at the time of water stoppage or movement of the valve unit 20 when the insertion port 5 is inserted into the receiving port 3. It is suppressed.

  Further, as shown in FIGS. 3 and 4, since the outer peripheral end of the boundary surface 30 between the high hardness member 19 a and the low hardness member 20 a reaches the outer surface 22 of the valve portion 20, the high hardness member 19 a becomes the valve portion 20. Thus, the sealing material 18 is more stably attached to the inside of the receiving port.

  Further, since the end surface 24 on the back side of the receiving port is formed in an arc shape with a predetermined radius r1 slightly bulging toward the back side of the receiving port, the pressing force F shown in FIG. Will improve. However, as long as sufficient sealing performance is ensured, the end surface 24 on the rear side of the receiving port may have a linear shape instead of an arc shape.

  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 Insert 10 Locking groove 13 Lock ring 15 Insertion protrusion 18 Seal material 19 Heel part 19a High hardness member 20 Valve part 20a Low hardness member 22 Outer surface 23 Inner surface 24 End face 25 on the back side Back side projection 28 Back side corner surface 30 Boundary surface 31 Gap A Pipe axis direction B Radial direction C Valve portion outer diameter D Range of formation of back side corner surface E Location of back side projection

Claims (5)

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 heel part consists of a high hardness member that is harder than the valve part,
The valve portion includes a low hardness member having a lower hardness than the heel portion,
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 heel portion has a protrusion protruding radially outward from the outer surface of the valve portion,
The outer surface of the valve portion is an annular surface that is straight and formed in the tube axis direction, with no irregularities except for the protrusion of the heel portion.
The outer peripheral end of the boundary surface between the high hardness member and the low hardness member reaches the outer surface of the valve portion, and the high hardness member constitutes a part of the outer surface of the valve portion,
A rear-side protrusion that protrudes radially inward from the inner surface of the valve portion is formed at the inner end of the valve portion on the inner side of the receiving port.
The end surface on the back side of the receiving port is formed along the radial direction across the outer end of the receiving port and the rear side protrusion,
In the state where the insertion port is inserted into the receiving port, a gap opened to the back side of the receiving port is formed between the inner surface of the receiving port and the end surface on the back side of the receiving port of the valve unit, and the rear side protruding portion The sealing material is characterized in that the forming portion is located between the gap and the outer surface of the insertion slot in the radial direction. The sealing material according to claim 1, wherein the end surface on the back side of the receiving port is formed in an arc shape with a predetermined radius that swells on the back side of the receiving port in a cross section . With the insertion port inserted into the receiving port, the contact portion between the inner surface of the valve portion and the outer surface of the insertion port is more in the tube axis direction than the contact portion between the outer surface of the valve portion and the inner surface of the receiving port. The sealing material according to claim 1, wherein the sealing material extends to the back side . A pipe joint comprising the sealing material according to any one of claims 1 to 3,
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 valve portion of the sealing material is compressed between the inner surface of the receiving port and the outer surface of the insertion port,
The end face on the back side of the valve part is inclined so that the diameter decreases toward the back side,
A gap is formed between the inner surface of the receiving port and the end surface on the back side of the receiving port of the valve portion,
The gap is open to the back of the receptacle,
A pipe joint characterized in that the formation portion of the rear side protrusion is located between the gap and the outer surface of the insertion slot in the radial direction. An insertion protrusion is formed on the outer surface of the insertion opening,
A lock ring is provided inside the receiving port and on the back side of the sealing material,
The pipe joint according to claim 4, wherein the insertion protrusion is engageable with the lock ring from the back of the receiving opening.

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