JP5950989B2 - Sealing material and pipe fittings - Google Patents

Description

The present invention relates to a seal material used for a pipe joint that inserts an insertion port into a receiving port, and a pipe joint using the seal material.

Conventionally, as this kind of sealing material, there is one used for a slip-on type separation preventing pipe joint 71 as shown in FIG. This pipe joint 71 has one pipe 72 connected to each other.
The insertion port 75 formed at the end of the other tube 74 is inserted into the receiving port 73 formed at the end of the tube.

An annular seal material 77 made of rubber is disposed in a seal material arrangement recess 76 formed on the inner periphery of the receiving port 73, and a lock ring groove 78 is formed on the back side of the seal material arrangement recess 76.
A lock ring 79 is attached to the lock ring groove 78, and an elastic member 80 for centering the lock ring 79 is disposed between the outer periphery of the lock ring 79 and the bottom surface of the lock ring groove 78. Has been. Further, a lock ring 79 is provided on the outer periphery of the distal end portion of the insertion opening 75.
A protrusion 81 that can be engaged from the back of the receiving opening is formed.

As shown in FIGS. 9 and 10, the sealing material 77 includes a heel portion 83 that fits and engages in a fitting groove 82 formed in the peripheral surface 84 of the sealing material disposition recess 76, the peripheral surface 84, and the insertion opening 75. And a valve portion 85 that generates a seal surface pressure by being compressed between the outer peripheral surface and the outer peripheral surface.

The valve portion 85 has first to third convex portions 86 to 88. The first convex portion 86 is formed on the outer peripheral portion of the valve portion 85 and protrudes outward in the radial direction A. Further, the second convex portion 87 is formed at the back end portion of the valve portion 85.

Further, the third convex portion 88 is formed on the inner peripheral portion of the valve portion 85 and protrudes inward in the radial direction A. The inner diameter of the third convex portion 88 is set smaller than the outer diameter of the insertion opening 75. ing. In addition, a tapered portion 89 that gradually decreases in diameter from the inner periphery of the heel portion 83 toward the third convex portion 88 is formed.

According to the above configuration, as shown in FIG. 9, the third convex portion 88 is expanded in diameter by inserting the heel portion 83 into the fitting groove 82 and inserting the insertion port 75 into the receiving port 73. At the same time, the valve portion 85 is sandwiched between the inner peripheral surface of the receiving port 73 and the outer peripheral surface of the insertion port 75. At this time, the space between the first convex portion 86 and the third convex portion 88 is compressed in the radial direction A.

In addition, the pipe joint 71 using the above sealing materials 77 is described in the following patent document 1, for example.

Japanese Patent No. 4836870

However, in the above conventional type, when the tubes 72 and 74 are joined together, the space between the first convex portion 86 and the third convex portion 88 is compressed in the radial direction A, as shown in FIG. Furthermore, the first dimension B from the outer periphery of the first protrusion 86 in the radial direction A to the inner periphery of the third protrusion 88 is the second protrusion from the outer periphery of the first protrusion 86 in the radial direction A. Since it is formed to be larger than the second dimension C up to the inner periphery of the portion 87, there is a problem that the compression force required to compress the valve portion 85 in the radial direction A is increased. If it increases, the problem that the maximum insertion force required when inserting the insertion opening 75 in the receptacle 73 will arise.

The present invention provides a sealing material and a pipe joint that can reduce the maximum insertion force required to insert the insertion port into the receiving port and can improve the water tightness between the receiving port and the insertion port. The purpose is to do.

In order to achieve the above object, the present invention provides a pipe joint in which an insertion opening formed at an end of one pipe is inserted into a receiving opening formed at an end of one pipe connected to each other. An annular sealing material made of an elastic material used,
A heel portion fitted in a fitting portion formed in the receiving port, and a valve portion sandwiched between the inner peripheral surface of the receiving port and the outer peripheral surface of the insertion port,
The valve portion has first to third convex portions,
The first convex portion is formed on the outer peripheral portion of the valve portion and protrudes radially outward,
The second convex portion is formed at the receiving end of the valve portion,
A tapered portion is formed which is reduced in diameter from the inner periphery of the heel portion toward the inner periphery of the second convex portion,
The third convex portion is formed in the tapered portion and protrudes radially inward, and is located between the heel portion and the second convex portion in the tube axis direction,
The inner diameter of the third convex portion is smaller than the outer diameter of the insertion opening and larger than the inner diameter of the second convex portion,
When the valve portion is sandwiched between the inner peripheral surface of the receiving port and the outer peripheral surface of the insertion port inserted into the receiving port, the second convex portion expands, and the first convex portion and the third convex portion By compressing the space between the portions in the radial direction, the watertightness between the receiving port and the insertion port is maintained.

According to this, the heel portion of the sealing material is fitted into the fitting portion in the receiving port, and the insertion port is inserted into the receiving port. At this time, the distal end portion of the insertion port abuts on the third convex portion of the sealing material and pushes the third convex portion in the depth direction of the receiving port, thereby expanding the diameter of the second convex portion and the third convex portion. Since the convex portion is drawn in the depth direction of the receiving port, a tensile force in the tube axis direction is generated in the valve portion and the valve portion is extended in the depth direction of the receiving port, so that the compression allowance of the valve portion in the radial direction is reduced.

Thereafter, the distal end portion of the insertion port compresses the valve portion of the sealing material while passing through the third convex portion, and at this time, the space between the first convex portion and the third convex portion is compressed in the radial direction. . At this time, the compression allowance of the valve portion in the radial direction is reduced, and the maximum insertion force is reduced.

Further, the space between the first convex portion and the third convex portion is radially compressed between the inner peripheral surface of the receiving port and the outer peripheral surface of the insertion port, so that it is between the receiving port and the insertion port. Therefore, the water tightness between the receiving port and the insertion port can be improved.

In the sealing material according to the second aspect of the present invention, concave portions are respectively formed between the heel portion and the first convex portion and between the heel portion and the third convex portion.
According to this, the tensile force generated in the valve portion when the insertion port is inserted into the receiving port and the third convex portion is pushed in the depth direction of the receiving port at the distal end of the insertion port is reduced, and the second convex portion is Easy diameter expansion. Thereby, since the protrusion part formed in the front-end | tip part of an insertion port can pass a valve | bulb part to a receptacle back direction easily, the insertion force at the time of joining can be reduced.

In the sealing material according to the third aspect of the invention, the first dimension from the first convex portion to the third convex portion in the inclined direction opposite to the inclined direction of the tapered portion is inclined opposite to the inclined direction of the tapered portion. It is larger than the width of the second convex portion in the direction.
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 heel part of the sealing material is fitted into the fitting part in the receiving port,
The insertion port is inserted into the receiving port,
The valve portion of the sealing material is sandwiched between the inner peripheral surface of the receiving port and the outer peripheral surface of the insertion port.
In the pipe joint according to the fifth aspect of the invention, the distal end portion of the insertion opening is formed in a tapered shape.

As described above, according to the present invention, it is possible to reduce the maximum insertion force required when the insertion port is inserted into the receiving port, and it is possible to improve the water tightness between the receiving port and the insertion port.

It is sectional drawing which shows the structure of the pipe joint provided with the sealing material in embodiment of this invention. It is a figure which shows the cross-sectional structure at the time of the non-mounting | wearing of the sealing material with which a pipe joint is provided similarly. It is sectional drawing which shows a mode that a pipe | tube is joined using a pipe joint similarly. It is a graph which shows the relationship between the insertion amount and insertion force of the insertion opening with respect to the receiving opening in a pipe joint. It is an expanded sectional view of the sealing material compression-deformed in the state which joined the pipes by the pipe joint similarly. It is sectional drawing which showed a mode that the pipe | tubes were joined when the clearance gap between the receiving port and insertion port of a pipe joint became the same. It is sectional drawing which showed a mode that the pipe | tubes were joined when the clearance gap between the receptacle and insertion port of a pipe joint became the same. It is a partially expanded sectional view of a pipe joint when an insertion slot inclines with respect to a receptacle by external forces, such as an earthquake. It is sectional drawing which shows the structure of the pipe joint provided with the conventional sealing material. It is a figure which shows the cross-sectional structure at the time of the non-mounting | wearing of the sealing material with which a pipe joint is provided similarly.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, reference numeral 1 denotes a push-on type separation preventing pipe joint, which is formed at a receiving port 3 formed at an end of one pipe 2 connected to each other and at an end of the other pipe 4. The insertion slot 5 is inserted.

On the inner peripheral surface of the receiving port 3, a seal material disposing recess 6 and a lock ring groove 7 positioned on the back side of the seal material disposing recess 6 are formed over the entire circumference. In the lock ring groove 7,
A circumferentially divided lock ring 8 is mounted, and an elastic biasing means such as a rubber ring for fixing the lock ring 8 between the outer periphery of the lock ring 8 and the bottom surface of the lock ring groove 7. 9 is arranged. Further, a back end surface 11 in the radial direction A is formed inside the receiving port 3 spaced from the lock ring groove 7 to the back side. Furthermore, the insertion slot 5 has a protrusion 12 that can be engaged with the lock ring 8 from the back side of the receiving end on the outer periphery of the distal end. Moreover, the front-end | tip part of the insertion port 5 is formed in the taper shape.

A fitting groove 14 (an example of a fitting portion) is formed over the entire circumference on the peripheral surface of the sealing material arrangement recess 6. The space between the receiving port 3 and the insertion port 5 is made of rubber (an example of an elastic material) and is sealed over the entire circumference by an annular sealing material 16. The sealing material 16 is configured as follows.

FIG. 2 shows a cross-sectional structure of the sealing material 16 alone not attached to the pipe joint 1. The sealing material 16 includes a heel portion 17 fitted in the fitting groove 14, and an inner peripheral surface (
And a valve portion 18 sandwiched between the outer peripheral surface of the insertion port 5. The heel portion 17 is an annular member having a rectangular cross-sectional shape (cross-sectional shape perpendicular to the circumferential direction).

The valve portion 18 is an annular member, and includes first to third valves 19 to 21 (an example of first to third convex portions) and first to fourth concave portions 23 to 26. Yes. Of these, the first valve 1
9 has an arc shape and is formed on the outer peripheral portion of the valve portion 18 over the entire circumference.
Protrudes outside.

The second valve 20 has an arc shape, is formed over the entire circumference at the receiving end of the valve portion 18, and protrudes obliquely toward the center of the tube. The valve portion 18 is formed with a tapered portion 28 that gradually decreases in diameter from the inner periphery of the heel portion 17 toward the inner periphery of the second valve 20.

The third valve 21 has an arc shape, is formed over the entire circumference of the tapered portion 28, protrudes inward in the radial direction A, and in the tube axis direction D, the heel portion 17, the second valve 20, Located between. Further, the inner diameter E1 of the third valve 21 is smaller than the outer diameter E2 of the insertion port 5 and larger than the inner diameter E3 of the second valve 20.

A first dimension from the first valve 19 to the third valve 21 in an inclination direction opposite to the inclination direction G of the taper portion 28 (that is, a direction inclined toward the tube center toward the near side of the receiving port 3). B is smaller than the second dimension C from the outer periphery of the first valve 19 to the inner periphery of the second valve 20 in the radial direction A.
The first dimension B is larger than the width W of the second valve 20 in the direction of inclination opposite to the direction of inclination G of the tapered portion 28.

Each of the first to fourth recesses 23 to 26 has an arc shape and is formed in the valve portion 18 over the entire circumference. Among these, the 1st recessed part 23 is between the heel part 17 and the 1st valve | bulb 19, the 2nd recessed part 24 is between the 1st valve | bulb 19 and the 2nd valve | bulb 20, and the 3rd recessed part 25 is the 1st valve | bulb. 2
The fourth recess 26 is formed between the third valve 21 and the third valve 21, and the fourth recess 26 is formed between the third valve 21 and the heel portion 17.

Hereinafter, the operation of the above configuration will be described.
First, the procedure for joining both the tubes 2 and 4 will be described with reference to FIG.
(1) The lock ring 8 and the elastic urging means 9 are fitted into the lock ring groove 7, and FIG.
2, the heel portion 17 of the sealing material 16 is fitted into the fitting groove 14, and the lock ring 8, the elastic biasing means 9, and the sealing material 16 are attached to the inside of the receiving port 3.

(2) Insert the insertion slot 5 into the receiving slot 3. At this time, as shown in FIG. 3 (b), the distal end portion of the insertion port 5 comes into contact with the third valve 21 of the sealing material 16, and the third valve 21 is pushed into the receiving port depth direction J, so that the first The diameter of the second valve 20 is expanded, and the third valve 21 is drawn in the receiving port depth direction J. Thereby, a tensile force in the tube axis direction D is generated in the valve portion 18, and the valve portion 1
Since 8 is stretched in the receiving port depth direction J, the first dimension B (see FIG. 2) is reduced, and the compression allowance of the valve portion 18 in the radial direction A is reduced.

By forming the first and fourth recesses 23 and 26, the third valve 21 is generated in the valve portion 18 when the third valve 21 is pushed in the receiving port back direction J as described above. The tensile force is reduced, and the diameter of the second valve 20 is easily expanded. Thereby, since the protrusion 12 of the insertion port 5 can easily pass the valve unit 18 in the receiving port depth direction J, the insertion force at the time of joining can be reduced.

(3) Thereafter, as shown in FIG. 3C, the protrusion 12 of the insertion port 5 compresses the valve portion 18 in the radial direction A while passing through the inside of the third valve 21. At this time, the positional relationship between the first to third valves 19 to 21 is close to a triangle having the third valve 21 as a vertex inside the radial direction A, and the first valve 19 and the third valve 21 Is compressed in the radial direction A.

Here, in a state where the sealing material 16 before inserting the insertion port 5 into the receiving port 3 is not compressed and deformed, as shown in FIG. 2, the first dimension B is smaller than the second dimension C. When the insertion port 5 is inserted into the receiving port 3 and the valve portion 18 of the sealing material 16 is compressed and deformed, the compression allowance of the valve portion 18 decreases.

(4) As shown in FIG. 3 (d), even after the protrusion 12 of the insertion port 5 passes through the inside of the third valve 21, the gap between the first valve 19 and the third valve 21 remains. Since it is compressed in the radial direction A, the compression allowance of the valve portion 18 is reduced in the same manner as in the joining procedure (3).
Maximum insertion force is reduced.

(5) After that, as shown in FIG. 1, both the pipes 2, 4 are joined by the protrusion 12 of the insertion port 5 passing through the inside of the lock ring 8 to the back of the receiving port.
In a state where both the pipes 2 and 4 are joined in this way, the first valve 19 is provided between the inner peripheral surface of the receiving port 3 (the peripheral surface of the sealing material disposing recess 6) and the outer peripheral surface of the insertion port 5. Since the space between the valve 3 and the third valve 21 is compressed in the radial direction A, the watertightness between the receiving port 3 and the insertion port 5 is maintained.
And the watertightness between the insertion opening 5 can be improved.

Further, as shown in FIG. 1, when water pressure (fluid pressure) is loaded in the joined pipes 2 and 4, the pushing force F <b> 1 that tries to push the sealing material 16 from the inside of the receiving port 3 to the outside is generated. Although acting on the second valve 20, the third valve 21 is in pressure contact with the outer peripheral surface of the insertion port 5 at this time, so that the second valve 20 is prevented from being pushed out by the third valve 21. When the second valve 20 is prevented from being pushed out in this way, a pressing force F2 proportional to the pushing force F1 is generated in the radial direction A of the valve portion 18 by the self-sealing action, so that the water tightness is further improved.

FIG. 4 is a graph showing the relationship between the insertion amount of the insertion port 5 with respect to the receiving port 3 and the insertion force.
Among these, the 1st graph M1 shown as the continuous line corresponds to this 1st Embodiment, and has the two peaks P1 and P2 from which insertion force becomes the maximum. Among these, the peak P1 of the first insertion force indicates that the tip of the insertion port 5 pushes the third valve 21 in the receiving port back direction J in the joining procedure (2) shown in FIG. This occurs when the valve portion 18 is stretched in the receiving port back direction J. Thereafter, the peak P2 of the second insertion force is shown in FIG.
The above-described joining procedure (3) shown in FIG. 4 occurs when the protrusion 12 of the insertion port 5 passes through the inside of the third valve 21 and the valve portion 18 is compressed in the radial direction A.

Thus, in this 1st Embodiment, when inserting the insertion port 5 in the receptacle 3, the valve part 18 is mainly extended to the receptacle back direction J, and the valve part 18 is mainly radial. The phenomenon of being compressed in A occurs with a slight shift in time according to the amount of insertion, so that the insertion force of the insertion port 5 with respect to the receiving port 3 is dispersed and reduced to the two peaks P1 and P2.

On the other hand, the second graph M2 indicated by a dotted line is the conventional graph shown in FIGS. 9 and 10 and has one peak P. According to this, when the insertion port 75 is inserted into the receiving port 73,
The phenomenon in which the valve portion 85 is mainly stretched in the depth direction of the receptacle and the phenomenon in which the valve portion 85 is mainly compressed in the radial direction A occur almost simultaneously according to the amount of insertion. For this reason, the insertion force of the insertion port 5 with respect to the receiving port 3 is concentrated in one peak P, without being disperse | distributed.

The above description shows the case where the gap S between the inner periphery of the receiving port 3 and the outer periphery of the insertion port 5 is standard (that is, when the gap S has a specified dimension), as shown in FIG. The third valve 21
The position of the first valve 19 hardly shifts in the insertion direction H side with respect to the position of the first valve 19, and therefore, the amount of shift between the position of the first valve 19 and the position of the third valve 21 in the tube axis direction D 30 is slight.

On the other hand, when the inner diameter dimension of the receiving port 3 is the minimum side of the manufacturing tolerance and the outer diameter dimension of the insertion port 5 is the maximum side of the manufacturing tolerance, as shown in FIG. Is minimized. In this way, when the gap S is the smallest, the allowance between the third valve 21 and the tip of the insertion slot 5 increases, so that the gap S shown in FIGS. 3 valve 21 is the receiving port 3
It is drawn to the back more than. Thereby, compared with the case where the clearance gap S is a standard, 1st dimension B
(See FIG. 2) is further reduced, and the compression allowance of the valve portion 18 in the radial direction A is reduced.

Further, since the space between the first valve 19 and the third valve 21 is compressed in the radial direction A when the pipes 2 and 4 are joined, the compression allowance of the valve portion 18 is reduced and the maximum insertion force is reduced. The effect that it is done is acquired.

Furthermore, as shown in FIG. 6B, when the gap S is the smallest, the third valve 21 is drawn deeper into the receiving port 3, so that the position of the third valve 21 is the position of the first valve 19. The position of the first valve 19 in the tube axis direction D and the third valve 2 are shifted to the insertion direction H side with respect to the position.
The amount of deviation 30 from the position 1 is larger than the amount of deviation 30 when the gap S is standard. At this time, since the compression allowance of the valve portion 18 in the radial direction A is reduced, the insertion force when the gap S is minimum is significantly reduced as compared with the conventional one shown in FIGS. 9 and 10.

Further, when the inner diameter dimension of the receiving port 3 is the maximum side of the manufacturing tolerance and the outer diameter dimension of the insertion port 5 is the minimum side of the manufacturing tolerance, the gap S is maximized as shown in FIG. Become. When the gap S is maximized as described above, the diameter of the second valve 20 is expanded by the insertion port 5 when the pipes 2 and 4 are joined. The diameter amount is smaller than the diameter expansion amount when the gap S is standard, and as shown in FIG. 7B, the first valve 19 abuts against the inner peripheral surface of the receiving port 3, and the second valve 20 and the third valve 21 are in contact with the outer peripheral surface of the insertion slot 5, the radial direction A is between the first valve 19 and the second and third valves 20 and 21.
Thus, water tightness between the receiving port 3 and the insertion port 5 can be ensured.

In addition, an external force acts on the pipe joint 1 and the pipes 2 and 4 in an earthquake or the like, and the pipe joint 1 may be bent or the pipes 2 and 4 may be flattened by such an external force. For example, as shown in FIG. 8, even when the insertion port 5 is inclined with respect to the receiving port 3, the first valve 19 contacts the inner peripheral surface of the receiving port 3 and the third valve 21. Comes into contact with the outer peripheral surface of the insertion slot 5. In this state, when water pressure is applied to the pipes 2 and 4, the pushing force F <b> 1 acts on the second valve 20 and the valve portion 18.
Is deformed, and the pressing force F2 proportional to the pressing force F1 is generated in the radial direction A of the valve portion 18 by the self-sealing action, so that the water tightness is improved.

As shown in FIG. 8, the insertion opening 5 is inclined with respect to the receiving opening 3, and the gap S between the inner periphery of the receiving opening 3 and the outer periphery of the insertion opening 5 is an opening end portion than the back side of the receiving opening 3. The third valve 21 and the outer peripheral surface of the insertion port 5 are surely pressed against the outer peripheral surface of the insertion port 5 by the radially inward pressing force F2 even when enlarged on the side. Insufficient watertightness can be prevented.

In general, when the diameters of the tubes 2 and 4 are increased, the rigidity of the insertion port 5 is reduced, and the tubes 2 and 4 are easily deformed flat. For this reason, even when the large-diameter pipes 2 and 4 are deformed flat by an external force other than an earthquake, the pressing force F2 proportional to the pushing force F1 is generated by the self-sealing action as in the case of the earthquake. Since it occurs in 18 radial directions A, water tightness is improved.

DESCRIPTION OF SYMBOLS 1 Pipe joint 2 One pipe 3 Receiving port 4 The other pipe 5 Insertion slot 14 Insertion groove (insertion part)
16 Seal material 17 Heel portion 18 Valve portions 19 to 21 First to third valves (first to third convex portions)
23, 26 First and fourth recesses 28 Tapered portion A Radial direction B First dimension D Pipe axis direction E1 Third valve inner diameter E2 Insertion outer diameter E3 Second valve inner diameter W Second valve Width of

Claims (5)

An annular sealing material made of an elastic material used for a pipe joint that inserts an insertion port formed at the end of the other tube into a receiving port formed at the end of one of the tubes connected to each other,
A heel portion fitted in a fitting portion formed in the receiving port, and a valve portion sandwiched between the inner peripheral surface of the receiving port and the outer peripheral surface of the insertion port,
The valve portion has first to third convex portions,
The first convex portion is formed on the outer peripheral portion of the valve portion and protrudes radially outward,
The second convex portion is formed at the receiving end of the valve portion,
A tapered portion is formed which is reduced in diameter from the inner periphery of the heel portion toward the inner periphery of the second convex portion,
The third convex portion is formed in the tapered portion and protrudes radially inward, and is located between the heel portion and the second convex portion in the tube axis direction,
The inner diameter of the third convex portion is smaller than the outer diameter of the insertion opening and larger than the inner diameter of the second convex portion,
When the valve portion is sandwiched between the inner peripheral surface of the receiving port and the outer peripheral surface of the insertion port inserted into the receiving port, the second convex portion expands, and the first convex portion and the third convex portion The sealing material characterized by maintaining the watertightness between a receptacle and an insertion port by compressing between parts radially. The sealing material according to claim 1, wherein concave portions are formed between the heel portion and the first convex portion and between the heel portion and the third convex portion, respectively. The first dimension from the first convex portion to the third convex portion in the inclined direction opposite to the inclined direction of the tapered portion is the width of the second convex portion in the inclined direction opposite to the inclined direction of the tapered portion. The sealing material according to claim 1 or 2, wherein the sealing material is larger than. A pipe joint comprising the sealing material according to any one of claims 1 to 3,
The heel part of the sealing material is fitted into the fitting part in the receiving port,
The insertion port is inserted into the receiving port,
A pipe joint, wherein a valve portion of a sealing material is sandwiched between an inner peripheral surface of a receiving port and an outer peripheral surface of an insertion port. The pipe joint according to claim 4, wherein a distal end portion of the insertion opening is formed in a tapered shape.

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