JP2019163807A - Pipe connector and seal member - Google Patents

Abstract

To provide a pipe connector capable of restricting reduction in seal function of a seal member even if a gap changes between a socket inner peripheral surface and a spigot outer peripheral surface.SOLUTION: A spigot 5 is inserted into a socket 3; an annular seal member housing space is formed between the inner periphery of the socket 3 and the circumference of the spigot 5; a seal member 26 is accommodated in the seal member housing space; a push ring 29 that is provided on inside of the socket 3 and that presses the seal member 26 onto the seal member-housing space to keep it compressed; the seal member 26 has a receiving surface 34 at the end that is pressed by the push ring 29; a defective part 35 is formed on the receiving surface 34; and the defective part 35 forms an escape space 37 surrounded with the outer peripheral surface of the spigot 5, the push ring 29, and the seal member 26.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a pipe joint in which an insertion opening is inserted into a receiving port and a seal member used for the pipe joint.

  Conventionally, as this type of pipe joint, for example, as shown in FIG. 22, the insertion port 104 of the other tube 103 is inserted into the receiving port 102 of one tube 101, and the inner periphery of the receiving port 102 and the insertion port 104 An annular seal member accommodating space is formed between the outer periphery and an annular rubber seal member 106 that seals between the inner periphery of the receiving port 102 and the outer periphery of the insertion port 104 is accommodated in the seal member accommodating space. There is something that has been. A push ring 108 that presses the seal member 106 against the seal member accommodation space via the split ring 107 and keeps the compressed state is provided inside the receiving port 102 of the pipe joint 100. Further, an annular protrusion 109 protruding inward in the tube diameter direction is formed on the inner periphery of the receiving port 102.

  A plurality of bolts 111 and connecting rods 112 are provided between the pusher wheel 108 and the back end face 110 of the receiving port 102 in the pipe circumferential direction. The bolt 111 is screwed into the pusher wheel 108. As the bolt 111 is unscrewed from the pusher wheel 108, the connecting rod 112 presses the rear end surface 110 of the receiving port 102, so that the reaction force causes the pusher wheel 108 to split. The seal member 106 is pushed into the seal member accommodation space via the ring 107, and the seal member 106 is maintained in a compressed state between the annular protrusion 109 and the split ring 107, thereby exhibiting a predetermined sealing function.

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

  Also, a pipe joint using a block body instead of the bolt 111 and the connecting rod 112 is described in Patent Document 2 below.

JP 2006-70994 A JP 2005-172147 A

  In this type of pipe joint, the distance 114 between the inner peripheral surface of the receiving port 102 and the outer peripheral surface of the insertion port 104 depends on the manufacturing tolerance of the inner diameter of the receiving port 102 and the manufacturing tolerance of the outer diameter of the insertion port 104. Change. For example, when the inner diameter of the receiving opening 102 is small and the outer diameter of the insertion opening 104 is large, the interval 114 is narrower than the standard value, so that the capacity of the seal member accommodating space is reduced. In the case of the above conventional type, when the seal member 106 is pushed into the seal member accommodation space by the pusher wheel 108 in this state, there is no escape space for the excessively compressed seal member 106. Therefore, as shown in FIG. One end portion 106a of 106 is deformed and enters the gap 115 between the annular protrusion 109 of the receiving port 102 and the outer peripheral surface of the insertion port 104, and is scratched by being sandwiched between the annular protrusion 109 and the outer peripheral surface of the insertion port 104. There is a fear. Alternatively, the other end 106 b of the seal member 106 is deformed and enters the gap 116 between the inner peripheral surface of the receiving port 102 and the outer peripheral surface of the split ring 107, and the inner peripheral surface of the receiving port 102 and the outer peripheral surface of the split ring 107. There is a risk of getting caught between the two. When the sealing member 106 is damaged in this way, there is a problem that the sealing function of the sealing member 106 is lowered.

  The pipe joint described in Patent Document 2 also has the same problem as described above.

  An object of the present invention is to provide a pipe joint and a seal member that can suppress a decrease in the sealing function of the seal member even if the interval between the inner peripheral surface of the receiving port and the outer peripheral surface of the insertion port changes. To do.

In order to achieve the above object, according to the first aspect of the present invention, the insertion port of the other tube is inserted into the receiving port of one tube,
An annular seal member accommodation space is formed between the inner periphery of the receiving port and the outer periphery of the insertion port,
A seal member that seals between the inner periphery of the receiving port and the outer periphery of the insertion port is inserted into the seal member accommodation space,
A push fitting that presses the seal member against the seal member accommodation space and keeps the compressed state in a compressed state is provided inside the receiving port,
The seal member has a receiving surface that is pressed by a push ring at the end,
A deficient part is formed on the receiving surface,
The missing portion forms an escape space surrounded by the outer peripheral surface of the insertion slot, the push ring, and the seal member.

  According to this, according to the manufacturing tolerance, when the inner diameter of the receiving port is small and the outer diameter of the inserting port is manufactured large, the gap between the inner peripheral surface of the receiving port and the outer peripheral surface of the inserting port is reduced. The capacity of the member accommodating space is reduced. In this state, when the seal member is pushed into the seal member accommodation space by the push ring, the missing portion of the seal member forms a clearance space surrounded by the outer peripheral surface of the insertion opening, the push ring, and the seal member, and is compressed excessively. A part of the seal member is deformed to reduce the escape space. In this way, a part of the excessively compressed seal member is deformed so as to reduce the escape space, so that a part of the seal member enters the gap between the inner peripheral surface of the receiving port and the outer peripheral surface of the press ring. Therefore, a part of the seal member can be prevented from being scratched by a gap between the inner peripheral surface of the receiving port and the outer peripheral surface of the press ring, and the sealing function of the seal member can be reduced. Can be suppressed.

The pipe joint according to the second aspect of the present invention has an annular protrusion projecting inwardly in the pipe radial direction on the inner periphery of the receiving port, and is located on the far side of the receiving port with respect to the annular protruding portion and faces the annular protruding portion. And a tapered sealing material pressure contact surface that is reduced in diameter,
The seal member accommodation space is formed between the outer periphery of the insertion opening and the sealing material pressure contact surface of the receiving opening.

  According to this, when the seal member is pushed into the seal member accommodating space by the push ring while the capacity of the seal member accommodating space is reduced due to manufacturing tolerances, a part of the excessively compressed seal member is deformed and escapes. Reduce space. In this way, a part of the excessively compressed seal member is deformed so as to reduce the escape space, so that a part of the seal member becomes a gap between the inner peripheral surface of the annular protrusion and the outer peripheral surface of the insertion opening. Since it can be prevented from entering, a part of the seal member can be prevented from being damaged by being sandwiched in the gap between the inner peripheral surface of the annular protrusion and the outer peripheral surface of the insertion slot. A decline in function can be suppressed.

In the pipe joint according to the third aspect of the present invention, a mounting space is formed between the seal member in the pipe axis direction and the back end face of the receiving port and between the inner periphery of the receiving port and the outer periphery of the insertion port in the tube radial direction. ,
The press ring is fitted around the insertion slot,
A spacer is provided between the rear end face of the receiving port in the tube axis direction and the press ring,
The push ring and the spacer are accommodated in the mounting space.

  According to this, since the push wheel and the spacer are accommodated in the mounting space, the insertion opening can be inserted into the reception opening until the distal end of the insertion opening reaches the back end surface of the reception opening. Thereby, the level | step difference of the pipe radial direction in the joint part of the internal peripheral surface of one pipe | tube and the internal peripheral surface of the other pipe | tube decreases, and the water flow resistance in a pipe | tube reduces.

In the pipe joint according to the fourth invention, the seal member has a valve portion made of a soft elastic body and a heel portion made of a hard elastic body,
One end of the heel portion in the tube axis direction is integrally connected to the valve portion,
A receiving surface is formed at the other end of the heel,
The seal member is inserted into the seal member accommodation space with the valve portion at the tip,
The missing part is a diameter that extends radially outward from the inner peripheral surface of the heel part and reaches the receiving surface.

  According to this, the valve portion and the heel portion are compressed by inserting the seal member into the seal member accommodation space with the valve portion at the tip, and the inner periphery of the receiving port and the outer periphery of the insertion port are mainly compressed by the valve portion. Is sealed. At this time, the missing portion of the seal member forms a relief space, and a part of the heel portion of the seal member that is excessively compressed deforms to reduce the relief space. Thereby, even if it is a case where the space | interval of the inner peripheral surface of a receptacle and the outer peripheral surface of an insertion port is narrow, it can prevent that a sealing member is damaged and can suppress the fall of the sealing function of a sealing member. .

  Since the sealing function of the sealing member is mainly maintained by the compression of the valve portion, even if a part of the heel portion of the sealing member is deformed and the clearance space is reduced as described above, the sealing function of the sealing member is improved. There is almost no effect, and the sealing function is not significantly reduced.

  In the pipe joint according to the fifth aspect of the present invention, the missing portion has a tapered surface that expands radially outward from the inner peripheral surface of the heel portion and reaches the receiving surface.

  According to this, by inserting the seal member into the seal member accommodation space, the valve portion and the heel portion are compressed, and the gap between the inner periphery of the receiving port and the outer periphery of the insertion port is sealed. In a state where the seal member is compressed in this way, there are places where the stress generated in the seal member is locally increased (hereinafter referred to as high stress places). It is possible to reduce the difference in height of the stress generated in. Thereby, the load concerning a sealing member can be equalized and the service life of a sealing member can be extended.

In the sixth invention, the insertion port of the other tube is inserted into the reception port of one tube,
Used for a pipe joint in which an annular seal member accommodation space is formed between the inner periphery of the receiving port and the outer periphery of the insertion port,
A seal member that is inserted into the seal member accommodation space by a push ring provided inside the receiving port and seals between the inner periphery of the receiving port and the outer periphery of the insertion port,
It has a receiving surface that is pressed by a push ring at its end,
A deficient part is formed on the receiving surface,
The missing portion forms an escape space surrounded by the outer peripheral surface of the insertion slot, the push ring, and the seal member.

  As described above, according to the present invention, even if the distance between the inner peripheral surface of the receiving port and the outer peripheral surface of the insertion port changes and the seal member is excessively compressed, a part of the seal member is deformed to escape the clearance space. By reducing, the sealing member can be prevented from being damaged, and the deterioration of the sealing function of the sealing member can be suppressed.

It is sectional drawing of the pipe joint in the 1st Embodiment of this invention. It is sectional drawing of the receptacle of a pipe joint similarly. It is a figure of the lock ring of a pipe joint. It is a figure of the sealing member of a pipe joint, and the one part is displayed by the cross section. It is a partially expanded sectional view of a pipe joint, and shows the case where the space | interval of the inner peripheral surface of a receptacle and the outer peripheral surface of an insertion port is a standard value. It is a figure of the push ring of a pipe joint. It is sectional drawing which shows the joining method of the pipe of a pipe joint, and shows a mode that the press ring and the lock ring were inserted in the receptacle. It is sectional drawing which shows the joining method of the pipe of a pipe joint, and shows a mode that the diameter of the lock ring was expanded using the giant clam vise. It is a figure which shows the joining method of the pipe of a pipe joint, and shows a mode that the diameter of the lock ring was expanded using the giant clam vise. It is a figure which shows the joining method of the pipe of a pipe joint, and shows a mode that the stopper for diameter reduction prevention was engage | inserted in the parting part of the lock ring. It is sectional drawing which shows the joining method of the pipe of a pipe joint, and shows a mode that the insertion port was inserted in the receiving port and the sealing member was deposited in the receiving port. It is sectional drawing which shows the joining method of the pipe of a pipe joint, and shows a mode that the space | interval of a push ring and the back end surface of a receiving port is expanded using the expansion jig. It is a perspective view of the jig for expansion used for the joining method of the pipe of a pipe joint. It is sectional drawing which shows the joining method of the pipe of a pipe joint similarly, and shows a mode that the spacer was set. It is sectional drawing which shows the joining method of the pipe of a pipe joint similarly, and shows a mode that the insertion port was further inserted in the receiving port, and the front-end | tip of the insertion port contact | abutted to the back end surface of the receiving port. It is a partially expanded sectional view of a pipe joint, and shows the case where the space | interval of the inner peripheral surface of a receptacle and the outer peripheral surface of an insertion port is smaller than a standard value. FIG. 4 is a partially enlarged cross-sectional view of the pipe joint, showing a case where the interval between the inner peripheral surface of the receiving port and the outer peripheral surface of the insertion port is larger than the standard value. It is the figure which carried out the cross section display of a part of seal member of the pipe joint in the 2nd Embodiment of this invention. It is a partially expanded sectional view of a pipe joint, and shows the case where the space | interval of the inner peripheral surface of a receptacle and the outer peripheral surface of an insertion port is a standard value. It is a partially expanded sectional view of a pipe joint, and shows the case where the space | interval of the inner peripheral surface of a receptacle and the outer peripheral surface of an insertion port is smaller than a standard value. FIG. 4 is a partially enlarged cross-sectional view of the pipe joint, showing a case where the interval between the inner peripheral surface of the receiving port and the outer peripheral surface of the insertion port is larger than the standard value. It is sectional drawing of the conventional pipe joint. It is a partially expanded sectional view of a pipe joint, and shows the case where the space | interval of the inner peripheral surface of a receptacle and the outer peripheral surface of an insertion port is smaller than a standard value.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
In 1st Embodiment, the method of performing piping in a shield or employ | adopting a propulsion method as a piping method of a water pipe is used. For example, the structure of the separation prevention pipe joint 1 shown in FIG. 1 will be described below as a ductile iron pipe separation prevention pipe joint that can be used in such a shielded pipe and a propulsion method.

  The insertion port 5 of the other tube 4 is inserted into the receiving port 3 of the one tube 2 to be joined to each other, and the outer periphery of the insertion port 5 at a position spaced from the tip of the insertion port 5 in the tube axis direction 7 is An outer peripheral projection 6 is formed over the entire circumference. In addition, the outer peripheral protrusion 6 is formed in a form in which a rise (protrusion) is formed directly on the outer periphery of the insertion slot 5 or a groove is formed in the outer periphery of the insertion opening 5 and another member is fitted into the groove (protrusion). ) Or a form in which a groove is formed on the outer periphery of the insertion slot 5 and the gap between the tip of the insertion slot 5 and the groove functions as an outer protrusion. Moreover, it is not limited to these forms.

  As shown in FIGS. 1 and 2, the inner periphery of the receiving port 3 includes an annular projecting portion 9 projecting inward in the tube diameter direction 8, and an annular projecting portion 9 and an opening end 10 of the receiving port 3. A lock ring receiving groove 11 located between them is formed.

  The lock ring housing groove 11 houses a lock ring 13 and a pressing member 14 that presses the lock ring 13 inwardly 17 in the pipe radial direction. As shown in FIG. 3, the lock ring 13 is a ring-shaped ring with a split structure having a dividing portion 15 at one place, and thereby the diameter of the lock ring 13 can be slightly expanded or reduced.

  The pressing member 14 is formed by joining a plurality of plate-shaped (or columnar) pressing bodies in an annular shape, and is provided between the outer peripheral surface of the lock ring 13 and the bottom surface of the lock ring receiving groove 11. Yes. The outer peripheral protrusion 6 is located between the annular protrusion 9 and the lock ring 13 in the tube axis direction 7 and can be engaged with the lock ring 13 from the removal direction 12 of the insertion port 5.

  A sealing material pressure contact surface 20 is formed over the entire circumference of the inner periphery of the receiving port 3 and between the annular protrusion 9 in the tube axis direction 7 and the back end surface 19 of the receiving port 3. The sealing material pressure contact surface 20 includes a tapered portion 21 that decreases in diameter from the inner side of the receiving port 3 toward the annular protrusion 9 and a straight portion 22 that reaches the annular protrusion 9 from the tapered portion 21.

  An annular seal member accommodation space 25 is formed over the entire circumference between the sealing material pressure contact surface 20 on the inner periphery of the receiving port 3 and the outer periphery of the insertion port 5. A seal member 26 that seals between the inner periphery of the receiving port 3 and the outer periphery of the insertion port 5 is inserted into the seal member accommodation space 25.

  An attachment space 27 is provided between the seal member 26 in the tube axis direction 7 and the back end surface 19 of the receiving port 3 and between the inner periphery of the receiving port 3 and the outer periphery of the insertion port 5 in the tube radial direction 8. It is formed all around.

  The mounting space 27 is sandwiched between the pusher 29 that presses the seal member 26 against the seal member housing space 25 and keeps the compressed state, and the rear end surface 19 of the receiving port 3 and the pusher 29 in the tube axis direction 7. A plurality of spacers 30 are accommodated.

  As shown in FIG. 4, the seal member 26 includes a valve portion 32 having a circular cross section made of soft rubber (an example of an elastic body) and a heel portion 33 having a wedge shape in cross section made of a hard rubber (an example of an elastic body). An annular member having One end of the heel portion 33 in the tube axis direction 7 is integrally connected to the valve portion 32. In addition, a receiving surface 34 that is pressed by the pusher wheel 29 is formed at the other end of the heel portion 33. The seal member 26 is inserted into the seal member accommodation space 25 with the valve portion 32 as a tip.

  On the receiving surface 34 of the seal member 26, a defective portion 35 is formed. The missing portion 35 has a tapered surface 36 that extends radially outward from the inner peripheral surface of the heel portion 33 and reaches the receiving surface 34 over the entire circumference. As shown in FIGS. 1, 5, and 17, the defect portion 35 forms a clearance space 37 surrounded by the outer peripheral surface of the insertion slot 5, the pusher wheel 29, and the seal member 26.

  As shown in FIG. 6, the pusher wheel 29 is a one-piece annular ring having a split portion 40 at one place, and thus the pusher wheel 29 can be slightly reduced in diameter. As shown in FIGS. 5 and 6, the pusher wheel 29 has a pressing surface 41 that presses the receiving surface 34 of the seal member 26 from the back of the receiving port 3 toward the opening end 10, and a pressing in the tube axis direction 7. It has a facing surface 42 that is formed on the opposite side of the surface 41 and faces the back end surface 19 of the receiving port 3.

  The facing surface 42 has an annular protrusion 43 that protrudes toward the inner end surface 19 of the receiving port 3 at a portion closer to the inner periphery thereof. The protrusion 43 has an outer diameter smaller than the outer diameter of the push wheel 29.

  As shown in FIG. 1, the spacer 30 maintains a predetermined distance 31 between the rear end surface 19 of the receiving port 3 and the pusher wheel 29 in the tube axis direction 7, and a metal plate is used. As shown by the imaginary lines, they are provided at a plurality of locations at intervals in the pipe circumferential direction 38. The predetermined interval 31 is an interval when the seal member 26 is compressed to a compression amount necessary for sealing. As shown in FIGS. 1 and 5, one end of each spacer 30 in the tube axis direction 7 is inserted between the protrusion 43 of the pusher wheel 29 and the inner periphery of the receiving port 3, and the other end of each spacer 30 is It is in contact with the back end surface 19 of the receiving port 3.

  A method for joining the pipes 2 and 4 of the pipe joint 1 will be described below.

  First, as shown in FIG. 7, the pusher wheel 29 is reduced in diameter, and in this state, is inserted from the opening end 10 of the receiving port 3 into the interior of the receiving port 3. Next, the pressing member 14 is housed in the lock ring housing groove 11, and then an external force is applied to the lock ring 13 to reduce the diameter of the lock ring 13, and in this reduced diameter state, from the opening end 10 of the receiving port 3. Fit into the lock ring receiving groove 11. Thereafter, by releasing the external force, the lock ring 13 returns to its original diameter and is received in the lock ring receiving groove 11.

  Next, as shown in FIGS. 8 and 9, the diameter of the lock ring 13 is increased by multiplying the giant clam vise 46 with the opening end 10 of the receiving port 3. At this time, as shown in FIGS. 11 and 12, the diameter of the lock ring 13 is increased until the inner peripheral surface of the lock ring 13 is flush with the inner peripheral surface of the receiving port 3. The giant clam vise 46 is set at a plurality of positions along the circumferential direction of the lock ring 13.

  When the diameter of the lock ring 13 is increased using the giant clam vise 46 in this manner, the divided portion 15 is also enlarged in the circumferential direction. Therefore, the diameter of the enlarged divided portion 15 is reduced as shown by the solid line in FIG. Insert the stopper 47 for prevention.

  If the stopper 47 for preventing diameter reduction is set, the diameter of the lock ring 13 is prevented thereby, so that all the clam vise 46 is removed at that time. Then, the lock ring 13 is maintained in an expanded state.

  Then, as shown in FIG. 11, the insertion slot 5 is inserted into the receiving slot 3. At this time, since the lock ring 13 is maintained in an expanded state, the outer peripheral projection 6 of the insertion port 5 passes through the inside of the lock ring 13 from the opening end 10 side of the receiving port 3 to the back side of the receiving port 3. can do.

  Thereafter, the seal member 26 is placed inside the receiving port 3, the valve portion 32 is set as a tip, and the seal member 26 is deposited between the sealing material pressure contact surface 20 of the receiving port 3 and the outer periphery of the insertion port 5. At this time, the pusher wheel 29 is set between the receiving surface 34 of the seal member 26 and the back end surface 19 of the receiving port 3.

  Next, as shown in FIG. 12, by using a plurality of expansion jigs 49 to widen the distance between the pusher wheel 29 and the back end surface 19 of the receiving port 3, the pusher wheel 29 is attached to the seal member 26. The receiving surface 34 is pressed from the back of the receiving port 3 toward the opening end 10, and the seal member 26 is pushed into the seal member accommodation space 25 and kept in a compressed state.

  As shown in FIG. 13, the expansion jig 49 has a hydraulic piston cylinder device 50, a bracket 52 is provided at the tip of the piston 51, and a cylinder 53 that receives the piston 51 in the bracket 52. The guide members 54 are provided on both sides.

  A dovetail groove 55 is provided on the side surfaces of the guide member 54 facing each other, and a protrusion 56 is formed on the side surface of the cylinder 53 so as to be fitted in the dovetail groove 55 and slidably movable in the length direction. The cylinder 53 is configured to reciprocate and slide along the guide member 54 by increasing or decreasing the hydraulic pressure from the communicating pipe 57.

  The guide member 54 and the cylinder 53 are provided with claws 59 and 60 that engage with the pusher wheel 29 and the back end surface 19 of the receiving port 3, respectively. As shown in FIG. 12, when one claw 59 is engaged with the back end surface 19 of the receiving port 3 and the other claw 60 is engaged with the pusher wheel 29 and hydraulic pressure is supplied into the cylinder 53, the piston 51 extends from the cylinder 53. Thus, the other claw 60 moves from the back of the receiving port 3 toward the opening end 10 with respect to the one claw 59. Thereby, the space | interval of the push ring 29 and the back end surface 19 of the receiving port 3 is expanded, and the push ring 29 presses the receiving surface 34 of the sealing member 26 toward the opening edge part 10 from the back of the receiving port 3.

  The expanding jigs 49 are set at a plurality of locations in the pipe circumferential direction 38, and the pusher wheel 29 is pressed as described above using the plurality of expanding jigs 49.

  In this state, as shown in FIG. 14, one end of the spacer 30 in the tube axis direction 7 is inserted between the protrusion 43 of the pusher wheel 29 and the inner periphery of the receiving port 3, and the other end of each spacer 30 is received. By abutting against the back end surface 19 of the mouth 3, the plurality of spacers 30 are set at equal intervals at locations where the expansion jig 49 is not set.

  Next, the expansion jig 49 is removed, and the insertion opening 5 is inserted into the receiving opening 3 until the tip of the insertion opening 5 comes into contact with the back end surface 19 of the receiving opening 3 as shown in FIG. Thereafter, as shown by the phantom line in FIG. 10, the diameter reduction preventing stopper 47 is removed from the divided portion 15 of the lock ring 13. Thereby, as shown in FIG. 1, the lock ring 13 is reduced in diameter by its own elastic force and the pressing force of the pressing member 14, and is held around the outer periphery of the insertion slot 5.

  As a result, the joining operation of the pipes 2 and 4 is completed, and as shown in FIG. 1, the spacer 30 keeps the distance between the rear end surface 19 of the receiving port 3 and the pusher wheel 29 at a predetermined interval 31. The member 26 is compressed to the required amount of compression.

  In addition, since the inner diameter of the receiving port 3 and the outer diameter of the insertion port 5 vary within manufacturing tolerances, the distance 61 between the inner peripheral surface of the receiving port 3 and the outer peripheral surface of the insertion port 5 is a standard value ( It fluctuates within a certain tolerance (within range) with respect to the design value.

  For example, as shown in FIGS. 1 and 5, when the interval 61 between the inner peripheral surface of the receiving port 3 and the outer peripheral surface of the insertion port 5 is a standard value, the seal member 26 is inserted into the seal member accommodating space by the pusher wheel 29. 25, the missing portion 35 of the seal member 26 forms a clearance space 37 surrounded by the outer peripheral surface of the insertion slot 5, the push ring 29 and the seal member 26, and the heel portion of the seal member 26 is appropriately compressed. A part of 33 is deformed to slightly reduce the escape space 37.

  Further, as shown in FIG. 16, the inner diameter of the receiving port 3 is the smallest and the outer diameter of the inserting port 5 is maximized, and the interval 61 between the inner peripheral surface of the receiving port 3 and the outer peripheral surface of the inserting port 5 is set. When it becomes smaller than the said standard value (refer FIG. 5), the capacity | capacitance of the seal member accommodation space 25 becomes the minimum. In this state, when the seal member 26 is pushed into the seal member accommodating space 25 by the pusher wheel 29, the distance 62 from the back end surface 19 of the receiving port 3 to the receiving surface 34 of the seal member 26 is independent of the size of the interval 61. Since it is always constant, the seal member 26 is excessively compressed. At this time, a part of the heel portion 33 of the excessively compressed seal member 26 is deformed to greatly reduce the escape space 37. In this way, a part of the excessively compressed heel portion 33 is deformed so as to reduce the escape space 37, so that the majority of the escape space 37 is occupied by a part of the deformed seal member 26. In addition, it is possible to prevent a part of the seal member 26 from entering the gap between the inner peripheral surface of the receiving port 3 and the outer peripheral surface of the press ring 29 or the inner peripheral surface of the annular protrusion 9 and the outer peripheral surface of the insertion port 5. Can do. Therefore, a part of the seal member 26 is scratched by being sandwiched between a gap between the inner peripheral surface of the receiving port 3 and the outer peripheral surface of the press ring 29 or a gap between the inner peripheral surface of the annular protrusion 9 and the outer peripheral surface of the insertion port 5. It is possible to prevent sticking, and it is possible to suppress a decrease in the sealing function of the sealing member 26.

  Further, as shown in FIG. 17, the inner diameter of the receiving port 3 is the largest and the outer diameter of the insertion port 5 is manufactured to be the smallest, and an interval 61 between the inner peripheral surface of the receiving port 3 and the outer peripheral surface of the insertion port 5 is set. When it becomes larger than the said standard value (refer FIG. 5), the sealing member 26 is not compressed too much and the escape space 37 hardly decreases.

  As described above, the amount of compression of the seal member 26 changes in accordance with the size of the interval 61 between the inner peripheral surface of the receiving port 3 and the outer peripheral surface of the insertion port 5. As shown in FIG. 17, the size of the escape space 37 changes. At this time, the escape space 37 decreases as the interval 61 decreases.

  The sealing function of the sealing member 26 is mainly maintained by compressing the valve portion 32 between the outer peripheral surface of the insertion port 5 and the straight portion 22 of the sealing material pressure contact surface 20 of the receiving port 3. Be drunk. For this reason, even if a part of the heel portion 33 of the seal member 26 is deformed and the escape space 37 is reduced as described above, the seal function of the seal member 26 is hardly affected, and the seal function is significantly lowered. There is no.

  Further, as shown in FIG. 4, the missing portion 35 of the seal member 26 has a tapered surface 36 that extends radially outward from the inner peripheral surface of the heel portion 33 and reaches the receiving surface 34 over the entire circumference. Therefore, in the state where the seal member 26 is inserted into the seal member accommodating space 25 and compressed, the high stress portions generated in the seal member 26 are reduced, and the height difference of the stress generated in the seal member 26 can be reduced. Thereby, the load applied to the seal member 26 can be made uniform, and the service life of the seal member 26 can be extended.

  Further, as shown in FIG. 1, since the pusher wheel 29 and the spacer 30 are accommodated in the mounting space 27, the insertion opening 5 is received until the distal end of the insertion opening 5 reaches the back end surface 19 of the reception opening 3. 3 can be inserted. Thereby, the level | step difference of the pipe radial direction 8 in the joint part of the internal peripheral surface of one pipe 2 and the internal peripheral surface of the other pipe 4 decreases, and the water flow resistance in the pipes 2 and 4 reduces.

  Further, when an detachment force acts on the insertion slot 5 due to an earthquake or the like and the insertion slot 5 moves in the removal direction 12 with respect to the receiving slot 3, the outer peripheral projection 6 engages with the lock ring 13, thereby The insertion opening 5 can be prevented from being detached from the receiving opening 3.

(Second Embodiment)
In the second embodiment, as shown in FIG. 18, the defective portion 70 formed on the receiving surface 34 of the seal member 26 expands radially outward in a direction perpendicular to the inner peripheral surface of the heel portion 33. A step surface 71 and a peripheral surface 72 that reaches the receiving surface 34 from the outer peripheral end of the step surface 71 are provided over the entire periphery.

  According to this, the same operation and effect as the operation and effect shown in the first embodiment can be obtained. That is, as shown in FIG. 19, when the distance 61 between the inner peripheral surface of the receiving port 3 and the outer peripheral surface of the insertion port 5 is a standard value, the seal member 26 is pushed into the seal member accommodating space 25 by the pusher wheel 29. At this time, the missing portion 70 of the seal member 26 forms a clearance space 37 surrounded by the outer peripheral surface of the insertion slot 5, the presser wheel 29, and the seal member 26, and the heel portion 33 of the seal member 26 that is properly compressed is formed. The part is deformed and the clearance space 37 is slightly reduced.

  Further, as shown in FIG. 20, the inner diameter of the receiving port 3 is manufactured to be the smallest and the outer diameter of the inserting port 5 is maximized, and the interval 61 between the inner peripheral surface of the receiving port 3 and the outer peripheral surface of the inserting port 5 is set. When it becomes smaller than the said standard value (refer FIG. 19), the capacity | capacitance of the seal member accommodation space 25 becomes the minimum. In this state, when the seal member 26 is pushed into the seal member accommodating space 25 by the pusher wheel 29, the distance 62 from the back end surface 19 of the receiving port 3 to the receiving surface 34 of the seal member 26 is independent of the size of the interval 61. Since it is always constant, the seal member 26 is excessively compressed. At this time, a part of the heel portion 33 of the excessively compressed seal member 26 is deformed to greatly reduce the escape space 37, and the majority of the escape space 37 is occupied by a part of the deformed seal member 26. As a result, a part of the seal member 26 is pinched by a gap between the inner circumferential surface of the receiving port 3 and the outer circumferential surface of the press ring 29 or a gap between the inner circumferential surface of the annular protrusion 9 and the outer circumferential surface of the insertion port 5. It is possible to prevent sticking, and it is possible to suppress a decrease in the sealing function of the sealing member 26.

  In addition, as shown in FIG. 21, the inner diameter of the receiving port 3 is maximized and the outer diameter of the insertion port 5 is minimized, and an interval 61 between the inner peripheral surface of the receiving port 3 and the outer peripheral surface of the insertion port 5 is set. When it becomes larger than the standard value (see FIG. 19), the sealing member 26 is not excessively compressed, and the escape space 37 is hardly reduced.

  In each of the embodiments described above, the single-split structure pusher 29 is used, but a multi-split structure pusher that can be divided into a plurality of arc-shaped pieces may be used.

  In each of the above embodiments, as shown in FIGS. 11, 12, and 14, the insertion port 5 is inserted into the interior of the receiving port 3 from the opening end 10 of the receiving port 3, and the outer peripheral projection 6 is the lock ring. 13, the seal member 26, the pusher wheel 29, and the spacer 30 are set in the receiving port 3 in a state where the inner side of 13 is passed from the opening end 10 side of the receiving port 3 to the back side of the receiving port 3. For example, the insertion port 5 is inserted into the interior of the receiving port 3 from the opening end 10 of the receiving port 3, and the outer peripheral projection 6 is located inside the lock ring 13 or the lock ring 13. The seal member 26, the pusher wheel 29, and the spacer 30 are set in the receiving port 3 in a state of being positioned on the opening end 10 side closer to the front side, and then the distal end of the insertion port 5 is the back end surface of the receiving port 3 The insertion slot 5 is inserted into the receiving slot 3 until it abuts against 19, and the stopper 47 for preventing diameter reduction is inserted into the lock ring 13 Procedure like removed from the dividing portion 15 may be subjected to joining of the tubes 2 and 4 with each other.

  In each of the above embodiments, as shown in FIG. 1, the pipe joint 1 includes the lock ring housing groove 11 and the lock ring 13, but the pipe joint does not include the lock ring housing groove 11 and the lock ring 13. 1 may be sufficient.

DESCRIPTION OF SYMBOLS 1 Pipe joint 2 One pipe 3 Receptacle 4 The other pipe 5 Insertion 6 Outer peripheral protrusion 7 Pipe axial direction 8 Pipe diameter direction 9 Annular protrusion 10 Open end 11 Lock ring accommodation groove 12 Removal direction 13 Lock ring 20 Sealing material pressure contact surface 25 Sealing member receiving space 26 Sealing member 27 Mounting space 29 Push ring 30 Spacer 32 Valve portion 33 Heel portion 34 Receiving surface 35 Defect portion 37 Relief space 61 The inner peripheral surface of the receiving port and the outer peripheral surface of the insertion port interval

Claims (6)

The insertion port of the other tube is inserted into the receiving port of one tube,
An annular seal member accommodation space is formed between the inner periphery of the receiving port and the outer periphery of the insertion port,
In the seal member housing space, a seal member that seals between the inner periphery of the receiving port and the outer periphery of the insertion port is stored,
A push fitting that presses the seal member against the seal member accommodation space and keeps the compressed state in a compressed state is provided inside the receiving port,
The seal member has a receiving surface that is pressed by a push ring at the end,
A deficient part is formed on the receiving surface,
The pipe joint characterized in that the missing part forms a clearance space surrounded by the outer peripheral surface of the insertion opening, the push ring and the seal member. On the inner periphery of the receiving port, there is an annular protrusion projecting inward in the tube diameter direction, and a taper-shaped sealing material that is located on the deeper side of the receiving port than the annular protrusion and is reduced in diameter toward the annular protrusion. A pressure contact surface is formed,
The pipe joint according to claim 1, wherein the seal member accommodation space is formed between an outer periphery of the insertion opening and a sealing material pressure contact surface of the receiving opening. A mounting space is formed between the seal member in the tube axis direction and the back end surface of the receiving port and between the inner periphery of the receiving port and the outer periphery of the insertion port in the tube radial direction,
The press ring is fitted around the insertion slot,
A spacer is provided between the rear end face of the receiving port in the tube axis direction and the press ring,
The pipe joint according to claim 1 or 2, wherein the push ring and the spacer are accommodated in a mounting space. The seal member has a valve portion made of a soft elastic body and a heel portion made of a hard elastic body,
One end of the heel portion in the tube axis direction is integrally connected to the valve portion,
A receiving surface is formed at the other end of the heel,
The seal member is inserted into the seal member accommodation space with the valve portion at the tip,
The pipe joint according to any one of claims 1 to 3, wherein the defect portion has a diameter that extends radially outward from the inner peripheral surface of the heel portion and reaches the receiving surface. The pipe joint according to claim 4, wherein the missing portion has a tapered surface that expands radially outward from the inner peripheral surface of the heel portion and reaches the receiving surface. The insertion port of the other tube is inserted into the receiving port of one tube,
Used for a pipe joint in which an annular seal member accommodation space is formed between the inner periphery of the receiving port and the outer periphery of the insertion port,
A seal member that is inserted into the seal member accommodation space by a push ring provided inside the receiving port and seals between the inner periphery of the receiving port and the outer periphery of the insertion port,
It has a receiving surface that is pressed by a push ring at its end,
A deficient part is formed on the receiving surface,
The seal member, wherein the defect portion forms an escape space surrounded by the outer peripheral surface of the insertion opening, the push ring, and the seal member.

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