JP2011052763A - Seal member and corrugated pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce manufacturing cost by enabling a corrugated pipe to be drawn out easily in a condition that the connecting construction of the corrugated pipe is not completed. <P>SOLUTION: A seal member, which is used for a pipe joint for connecting the corrugated pipe, includes a seal portion 40, which is formed with an outer diameter larger than the inner diameter of the inner hole of a joint body 10 having the inner hole 16 into which the corrugated pipe T is inserted and inner diameter smaller than the outer diameter of the corrugated pipe T, and an extension portion 41, which is integrated with the seal portion 40 and formed with inner diameter larger than the outer diameter of the corrugated pipe T, and keeps a refractory packing fixed on the outer circumference of the extension portion 41. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an improvement of a pipe joint used for connecting a bellows-like corrugated pipe, and more particularly to an improvement of a seal member.

  Metal bellows corrugated pipes are widely used for indoor gas pipes and the like. In addition, various pipe joints for connecting the corrugated pipe to a gas stopper, a steel pipe, and the like are used. In Patent Documents 1 and 2, the applicants proposed a pipe joint that can be connected simply by inserting a corrugated pipe, and that this connection work can be easily performed.

  FIG. 7 is a pipe joint described in Patent Document 1, and a corrugated pipe joint 1B includes a joint body 10 having a through hole portion 16 into which a corrugated pipe T is inserted from one end side, and a through hole portion 16 in order from the back side. A holding member 70 that holds the elastic member (spring) 71 in a compressed state, a seal member 40B that is slidably disposed in the through-hole portion 16, and a retainer 50B having a claw portion 52B that engages with the corrugated tube T; A head portion 21 having a large diameter is formed on one side, and an insertion portion 24 having a small diameter is formed on the other side, and a push nut 20 </ b> B is formed so that the insertion portion 24 is inserted into the through hole portion 16 of the joint body 10. Have.

  The retainer 50B is built in such a manner that the inner diameter thereof is larger than the outer diameter of the corrugated tube T, and a metal guide 42 having the same inner diameter as that of the retainer 50B is integrally formed on the retainer 50B side of the seal member 40B. is doing. A fireproof packing 44 is attached to the metal guide 42, and the end of the metal guide 42 is close to the tip of the retainer 50B. Therefore, while the spring 71 is in a compressed state (that is, a state where the connection construction of the corrugated pipe T is not completed), the retainer 50B does not reduce the diameter, and thus the corrugated pipe T can be easily pulled out.

  The holding member 70 is a member having an L-shaped cross section, and one end supports the elastic member 71 in a compressed state, and a locking projection 73 is formed on the other end that protrudes. The locking protrusion 73 is locked in the holding member locking groove 75 formed in the through hole portion 16 of the joint body 10, and the movable member 80 is fitted on the inner peripheral side of the locking protrusion 73. The stop projection 73 is restricted from shrinking inward. Note that the outer diameter of the tip of the locking projection 73 of the holding member 70 is formed to be smaller than the inner diameter of the holding member locking groove 75 when the movable member 80 is not fitted.

  When the corrugated tube T is inserted, the movable member 80 slides in the depth direction of the through hole portion 16, and the movable member 80 is separated from the inner peripheral surface of the holding member 70. Then, the locking projection 73 of the holding member 70 is reduced in diameter and detached from the holding member locking groove 75. At the same time, the elastic member 71 extends, presses the seal member 40B via the holding member 70, and slides it toward the inlet of the through hole portion 16. Moreover, the metal guide 42 and the fireproof packing 44 will also slide.

  Then, the metal guide 42 presses the claw portion 52B of the retainer 50B. Since one end 55 of the retainer 50B is locked in the inner surface locking groove 27 of the push nut 20B, the claw 52B is reduced in diameter with the one end 55 as a fulcrum, and is engaged with the valley of the corrugated pipe T. Thereby, the corrugated pipe T and the corrugated pipe joint 1B are firmly connected, and the construction is completed.

  47 is an O-ring that seals the joint body 10 and the push nut 20B in a water-tight manner, 48 is a packing that seals the push nut 20B and the corrugated tube T in a water-tight manner, and 60 is a liquid such as water that allows gas such as air and water vapor to pass therethrough. Is a selectively permeable member having the property of repelling. Reference numeral 14 denotes a male screw part for connecting to another piping member on the outer surface of the other end side of the joint body 10, and 15 denotes a tool engaging part for screwing the male screw part 14 to the other piping member. .

  The through hole portion 16 of the joint body 10 is formed with a locking groove portion 18a and an avoidance groove 18b that is continuous with the locking groove portion 18a and has a larger diameter than the locking groove portion 18a. On the other hand, a locking groove 25 is formed in the insertion portion 24 of the push nut 20B. And the stop ring 61 is arrange | positioned so that the latching groove part 18a and the latching ditch | groove 25 may be straddled. The stop ring 61 is a metal C-shaped ring having elasticity. When the insertion portion 24 of the push nut 20B is inserted into the through-hole portion 16 of the joint body 10, the stop ring 61 is retracted into the locking groove 25 and stored. When the locking groove 18a is reached, the diameter is slightly increased, whereby the joint body 10 and the push nut 20B are connected in advance.

  A disassembly ring 63 having a predetermined thickness is sandwiched between one end face of the joint body 10 and the head portion 21 of the push nut 20B. When the disassembly ring 63 is removed, the disassembly ring The push nut 20 </ b> B can be pushed into the through hole portion 16 of the joint body 10 by the thickness of 63. When the push nut 20B is pushed into the through-hole portion 16, the stop ring 61 moves from the position of the engaging groove step portion 18a to the avoidance groove 18b, where the stop ring 61 is expanded in diameter, so that the joint body 10 and the push nut 20B Connection is released. As a result, the joint body 10 and the push nut 20B can be disassembled.

Japanese Patent Application No. 2008-220319 Japanese Patent Application No. 2008-220336

  However, since the metal guide is integrally formed with the seal member, insert molding has to be performed, and there is room for improvement in terms of manufacturing cost. FIG. 8 shows a state where the metal guide 42 interposed between the seal member 40 and the fireproof packing 44 is removed from the pipe joint described in Patent Document 1, and the connection construction of the corrugated pipe is not completed. The half sectional view when it will be in the state where the corrugated pipe is pulled out is shown.

  As shown in FIG. 8, when the corrugated tube T is pulled out from the state where the connection construction of the corrugated tube T is not completed, the tip of the corrugated tube T is engaged with the retainer 50B, and the corrugated tube T cannot be pulled out. There was a problem. As shown in the drawing, it has been found that this phenomenon becomes remarkable when the corrugated tube is pulled out while being bent (in the drawing, it is bent downward).

  Further, when vibration is applied during the transportation of the corrugated pipe joint 1A or the like, the movable member 80 slides in the depth direction of the through-hole portion 16, and the elastic member 71C is connected even though the corrugated pipe T is not connected. There was a possibility that the corrugated tube T could not be connected by extending and reducing the diameter of the retainer 50B.

An object of the present invention is to reduce the manufacturing cost while having the advantage of the conventional pipe joint that the corrugated pipe can be easily pulled out in a state where the connection construction of the corrugated pipe is not completed.
Another object of the present invention is to provide a corrugated pipe joint that is less prone to problems due to inadvertent sliding of the movable member.

  The present invention is a seal member used in a pipe joint for connecting a corrugated pipe, and has an outer diameter larger than an inner bore inner diameter of a joint body having an inner hole into which the corrugated pipe is inserted, and an outer diameter of the corrugated pipe A seal portion formed with a smaller inner diameter and a claw portion that engages with the corrugated tube, and the seal is disposed on the retainer side that is disposed in a state where the inner diameter of the claw portion is larger than the outer diameter of the corrugated tube The seal member includes an extension portion that protrudes from the portion, is integral with the seal portion, and has an inner diameter larger than the outer diameter of the corrugated tube, and a fireproof packing fixed to the outer periphery of the extension portion.

  According to the above configuration, the retainer disposed in a state larger than the outer diameter of the corrugated tube projects from the seal portion, is integral with the seal portion, and has an inner diameter larger than the outer diameter of the corrugated tube. Therefore, when pulling out the corrugated pipe from a state where the corrugated pipe has not been connected, the tip of the retainer does not engage with the corrugated pipe, and the metal guide needs to be insert-molded. Therefore, the manufacturing cost can be reduced.

  The present invention also provides a joint main body having an inner hole into which a corrugated tube is inserted, an elastic member that can expand and contract in the axial direction of the inner hole, a holding means that holds the elastic member in a compressed state, and the inner hole. The seal member according to claim 1, which is slidably disposed on the corrugated tube, and a claw portion that engages with the corrugated tube, wherein the inner diameter of the claw portion is larger than the outer diameter of the corrugated tube. A retainer and a nut member connected to the joint body are provided, and the holding means releases the compressed state of the elastic member by inserting the corrugated pipe, and the seal member is released along with the extension of the elastic member. The retainer is compressed in the axial direction, and the retainer is reduced in diameter so as to be engaged with the corrugated tube. The holding means includes a ring-shaped support portion that supports one end of the elastic member, and the support portion. Protruding A holding member having a locking projection formed at an end, a holding member locking groove of a joint main body to which the locking projection is locked, and an inner hole of the holding member, to the inner diameter side of the locking projection It is a corrugated pipe joint provided with the movable member which regulates the diameter reduction of this.

  The present invention also provides a joint main body having an inner hole into which a corrugated tube is inserted, an elastic member that can expand and contract in the axial direction of the inner hole, a holding means that holds the elastic member in a compressed state, and the inner hole. A slidable seal member, a retainer having a claw portion that engages with the corrugated pipe, and a nut member connected to the joint main body, and the holding means is provided by inserting the corrugated pipe. The elastic member is released from a compressed state, and the elastic member is compressed, the seal member is compressed in the axial direction, and the retainer is reduced in diameter to engage with the corrugated pipe, and the holding The means includes a ring-shaped support portion for supporting one end of the elastic member, a holding member having a locking projection formed at a tip protruding from the support portion, and holding of a joint body to which the locking projection is locked Part The movable member includes a locking groove and a movable member that is inserted into the inner hole of the holding member and restricts the diameter of the locking projection toward the inner diameter side, and the movable member has a protruding portion that contacts the joint body at one end. In addition, the corrugated pipe joint is characterized in that an axial notch is formed in the protrusion.

  According to the seal member of the present invention, the retainer disposed in a state larger than the outer diameter of the corrugated tube projects from the seal portion, is integral with the seal portion, and is larger than the outer diameter of the corrugated tube. Because it has an extension formed with an inner diameter, when pulling out the corrugated pipe from a state where the corrugated pipe has not been connected, the tip of the retainer does not engage with the corrugated pipe, and the metal guide is inserted. Since it is not necessary to mold, manufacturing cost can be reduced.

It is a half sectional view of the first example of the corrugated pipe joint of the present invention. It is a half sectional view of a state in the middle of inserting a corrugated pipe into a corrugated pipe joint of the present invention. It is a half sectional view of the state where connection construction of the corrugated pipe was completed to the corrugated pipe joint of the present invention. FIG. 3 is a half sectional view showing a state where a corrugated pipe joint is pulled out from the state shown in FIG. It is a half sectional view of the second example of the corrugated pipe joint of the present invention. It is a perspective view of the movable member in a 2nd Example. It is a half sectional view showing a conventional pipe joint. The metal guide 42 interposed between the seal member 40 and the fireproof packing 44 is removed from the conventional pipe joint, and the corrugated pipe is pulled out from the state where the connection construction of the corrugated pipe is not completed. FIG.

[First embodiment]
A first embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 is a half sectional view of the first embodiment of the corrugated pipe joint of the present invention, FIG. 2 is a half sectional view of the corrugated pipe joint of the present invention in the middle of insertion of the corrugated pipe, and FIG. The half sectional view of the state which completed the construction of connecting a corrugated pipe to a pipe joint is shown. FIG. 4 is a half sectional view showing a state where the corrugated pipe joint is pulled out from the state shown in FIG.
In addition, the same structure as the conventional pipe joint shown in FIG. 7 attaches | subjects the same code | symbol, and abbreviate | omits detailed description.

<Corrugated pipe fitting>
As shown in FIG. 1, the corrugated pipe joint 1 includes a joint body 10 having a through-hole portion 16 into which the corrugated pipe T is inserted from one end side, an elastic member 71 that is extendable in the axial direction of the through-hole portion 16, A holding member 70 for holding the elastic member 71 in a compressed state, a seal member 40 slidably disposed in the through-hole portion 16, a retainer 50 having a claw portion 52 that engages with the corrugated pipe T, and a joint body 10 and a push nut 20 connected to 10.

  A tapered inner surface 28 is formed on the inner surface side of the insertion portion 24 of the push nut 20 so as to increase in diameter toward the tip, and has a tapered outer surface 54 formed so as to face the tapered inner surface 28. A retainer 50 having a claw 52 that engages with a trough of the tube T is disposed (see also FIG. 2). And the internal diameter of the nail | claw part 52 of this retainer 50 is made larger than the external shape of the corrugated pipe T in a no-load state. Therefore, at the stage of inserting the corrugated tube T, the claw portion 52 of the retainer 50 can be smoothly inserted without being engaged with the peak portion of the corrugated tube T.

  The retainer 50 is a ring-shaped member disposed between the seal member 40 and the push nut 20 in the through hole portion 16 of the joint body 10. The rear part is an integral ring, and the front part is divided into a plurality of segments (eight in one example) by an axially divided part 53. At the tip of each segment, a claw portion 52 that protrudes radially inward is provided. In the retainer 50, for example, the base is made of plastic and the claw portion 52 is made of brass, and both are integrally molded.

  Next, the seal member 40 is a ring-shaped rubber elastic member that seals the outer peripheral surface of the corrugated tube T, and the outer diameter side is set larger than the inner diameter of the inner peripheral surface of the through hole 16 of the joint main body 10. The joint body 10 is press-fitted so as to be in airtight contact with the through-hole portion 16, and is disposed so as to be movable in the axial direction along the inner peripheral surface of the through-hole portion 16 of the joint body 10. On the other hand, the inner diameter side is provided slightly smaller than the outer diameter of the corrugated tube T. At the end of the retainer 50 side, there is an extension 41 formed with an inner diameter substantially the same as the inner diameter of the claw portion 52 of the retainer 50. The seal member 40 is preferably made of nitrile butadiene rubber (NBR) in consideration of gas resistance because it is necessary to maintain the seal performance for a long period of time.

  A ring-shaped fireproof packing 44 is integrally formed on the outer periphery of the extension portion 41. The fireproof packing 44 only needs to be fixed to the seal member 40 so that the through-hole portion 16 can be slid together with the seal member 40, and may be fitted or bonded to the extension portion 41. The fireproof packing 44 fills a mold with, for example, a rubber compound obtained by kneading raw material rubber, a graphite intercalation compound that is thermally expanded in a non-foamed state, and, if necessary, a filler, a softening material, a vulcanizing agent, etc. And then press vulcanized.

  The elastic member 71 is, for example, a stainless steel coil spring, one end of which is in contact with the contact step portion 19 a formed in the through hole portion 16 of the joint body 10, and the other end is supported by the holding member 70.

  The through hole portion 16 of the joint body 10 includes a first locking groove portion 18a, an avoidance groove 18b connected to the first locking groove portion 18a and having a larger diameter than the first locking groove portion 18a, and a first locking groove 18a. A second locking groove 18c having the same inner diameter as that of the first locking groove 18a is formed. On the other hand, a locking groove 25 is formed in the insertion portion 24 of the push nut 20. And the stop ring 61 is arrange | positioned so that the 1st latching groove part 18a and the latching recessed groove 25 may be straddled. The stop ring 61 is a metal C-shaped ring having elasticity. When the insertion portion 24 of the push nut 20 is inserted into the through hole portion 16 of the joint body 10, the stop ring 61 is retracted and stored in the locking groove 25. And when it comes to the position of the 1st latching groove part 18a, a diameter is expanded a little, and, thereby, the coupling main body 10 and the push nut 20 are connected beforehand.

  A disassembly ring 63 having a predetermined thickness is sandwiched between one end face of the joint body 10 and the head portion 21 of the push nut 20. When the disassembly ring 63 is removed, the disassembly ring The push nut 20 can be pushed into the through hole portion 16 of the joint body 10 by the thickness of 63. When the push nut 20 is pushed into the through hole portion 16, the stop ring 61 moves from the position of the second locking groove portion 18 c to the avoidance groove 18 b, and the stop ring 61 expands here, so that the joint body 10 and the push nut 20 are moved. Connection with is released. As a result, the joint body 10 and the push nut 20 can be disassembled.

<Construction procedure>
Next, the procedure for connecting the corrugated pipe T to the corrugated pipe joint 1 and the operation thereof will be described in detail with reference to FIGS.

  As shown in FIG. 2, when the corrugated pipe T is inserted into the corrugated pipe joint 1, the inner diameter of the retainer 50 is made larger than the outer diameter of the corrugated pipe T, and the extension 41 of the seal member 40 is also the same as the inner diameter of the retainer 50. Therefore, the corrugated tube T can be smoothly inserted up to the extension portion 41. When the corrugated tube T is further pushed in while feeling a slight response on the inner peripheral surface of the seal member 40, the tip of the corrugated tube T comes into contact with the end surface of the movable member 80.

  When further force is applied, as shown in FIG. 3, the movable member 80 slides in the depth direction of the through-hole portion 16 with the insertion of the corrugated tube, and the movable member 80 is separated from the inner peripheral surface of the holding member 70. Then, as shown in FIG. 3, the holding member 70 is reduced in diameter and detached from the holding member locking groove 75. At the same time, the elastic member 71 expands, presses the seal member 40 via the holding member 70, and slides it toward the inlet of the through-hole portion 16. Further, the fireproof packing 44 is also slid.

  The fireproof packing 44 presses the claw portion 52 of the retainer 50. Since the retainer 50 has a tapered outer surface 54 formed on the back side thereof and is pressed against the tapered inner surface 28 of the push nut 20, the claw portion 52 is reduced in diameter and engaged with the valley portion of the corrugated tube T. As a result, the corrugated pipe T and the corrugated pipe joint 1 are firmly connected.

  Subsequently, in order to confirm that the corrugated pipe T and the corrugated pipe joint 1 are firmly connected, a force in the pulling direction is applied to the corrugated pipe T. Then, the stop ring 61 moves from the position of the first locking groove 18 a to the position of the second locking groove 18 c, and the disassembly ring 63 appears on the outer periphery of the push nut 20. If the surface of the disassembly ring 63 is colored differently from the color of the push nut 20, it is possible to easily confirm the state of completion of construction.

<Pulling out the tube before connection is completed>
By the way, the pipe is rarely pulled while the corrugated pipe T is being inserted into the corrugated pipe joint 1 because the pipe length is insufficient during the construction of the corrugated pipe T or the pipe laying route is wrong. It may be pulled out. FIG. 4 is a sectional view showing such a state.

  As shown in FIG. 4, the corrugated tube T is about to be pulled out while being bent slightly to the left. Since the seal member 40 of the corrugated pipe joint 1 has the extension portion 41 having an inner diameter set substantially the same as the inner diameter of the retainer 50, the outer peripheral surface of the corrugated pipe T is in contact with the claw portion 52 of the retainer 50 even in such a state. The corrugated tube T can be pulled out without being caught.

[Second Example]
A second embodiment of the present invention will be described in detail with reference to FIGS. FIG. 5 is a half sectional view of a second embodiment of the corrugated pipe joint of the present invention, and FIG. 6 is a perspective view of a movable member in the second embodiment.
In addition, the same structure as the conventional pipe joint shown in FIG. 7 and the 1st Example shown in FIGS. 1-4 is attached | subjected the same code | symbol, and abbreviate | omits detailed description.

  As shown in FIG. 5, the corrugated pipe joint 1 </ b> A includes a movable member 80 </ b> A inserted inside the holding member 70. The movable member 80A is formed with a protrusion 81A that abuts against the inner tapered surface 12 formed in the through hole 16 of the joint body 10A, and an axial notch 82A is formed on the protrusion 81A. (See also FIG. 6). The outer peripheral surface of the protrusion 81A is formed with a tapered surface having substantially the same angle as the inner tapered surface.

  Therefore, since the protruding portion 81A is in contact with the inner tapered surface 12, the movable member 80A is difficult to move in the axial direction of the through hole portion 16 to the extent that vibration such as during transportation is applied. When the movable member 80A is pushed in at the tip of the corrugated tube, the notch 82A is formed, so that the protrusion 81A is reduced in diameter along the inner surface tapered surface 12, and the movable member 80A is the inner periphery of the holding member 70. It is configured to leave the surface.

  The shape of the corrugated pipe joint according to the present invention is not limited to a single screw socket having a male screw portion at one end, and may have both sockets, elbows, tees, or female screws. Further, the joint structure of the present invention can be integrally provided at the end of a device such as a gas stopper or a gas meter.

1, 1A: Corrugated pipe joint,
10: Joint body, 12: Tapered inner surface, 14: Male thread portion, 15: Tool hook portion, 16: Through hole portion, 18a: First locking groove portion, 18b: Avoidance groove, 18c: Second locking groove,
20: push nut, 21: head portion, 22: insertion hole portion, 23: O-ring groove, 24: insertion portion, 25: locking groove, 26: vent hole, 27: inner surface locking groove, 28: tapered inner surface ,
40: seal member (airtight packing), 41: extension, 44: fireproof packing, 47: watertight O-ring, 48: watertight packing,
50: Retainer, 52: Claw part, 53: Dividing part, 54: Tapered outer surface,
60: selectively permeable member, 61: stop ring, 63: ring for disassembly,
70: holding member,
71: elastic member, 73: locking protrusion, 75: holding member locking groove 80, 80A: movable member, 81A: protruding portion, 82A: notch T: corrugated tube,

Claims (3)

A seal member used for a pipe joint for connecting a corrugated pipe,
An outer diameter larger than the inner diameter of the joint body having an inner hole into which the corrugated pipe is inserted, and a seal portion formed with an inner diameter smaller than the outer diameter of the corrugated pipe,
A claw portion that engages with the corrugated tube, protrudes from the seal portion on the side of the retainer disposed in a state where the inner diameter of the claw portion is larger than the outer diameter of the corrugated tube, and is integral with the seal portion A seal member comprising: an extension formed with an inner diameter larger than the outer diameter of the corrugated tube; and a fireproof packing fixed to the outer periphery of the extension. A joint body having an inner hole into which the corrugated pipe is inserted;
The elastic member elastically stretchable in the axial direction of the inner hole, holding means for holding the elastic member in a compressed state, and the seal member according to claim 1 slidably disposed in the inner hole;
A retainer that has a claw portion that engages with the corrugated tube, and is arranged in a state in which an inner diameter of the claw portion is larger than an outer diameter of the corrugated tube;
A nut member connected to the joint body;
With the insertion of the corrugated tube, the holding means releases the compressed state of the elastic member, and with the extension of the elastic member, the seal member is compressed in the axial direction, and the retainer is reduced in diameter so that the corrugated Configured to engage the tube,
The holding means includes a ring-shaped support portion that supports one end of the elastic member, a holding member having a locking projection formed at a tip protruding from the support portion, and a joint body to which the locking projection is locked A corrugated pipe joint comprising: a holding member locking groove; and a movable member that is inserted into the inner hole of the holding member and restricts the diameter of the locking projection toward the inner diameter side. A joint body having an inner hole into which the corrugated pipe is inserted;
An elastic member that can expand and contract in the axial direction of the inner hole, a holding means that holds the elastic member in a compressed state, a seal member that is slidably disposed in the inner hole, and a claw portion that engages with the corrugated pipe A retainer having a nut member connected to the joint body,
With the insertion of the corrugated tube, the holding means releases the compressed state of the elastic member, and with the extension of the elastic member, the seal member is compressed in the axial direction, and the retainer is reduced in diameter so that the corrugated Configured to engage the tube,
The holding means includes a ring-shaped support portion that supports one end of the elastic member, a holding member having a locking projection formed at a tip protruding from the support portion, and a joint body to which the locking projection is locked A holding member locking groove, and a movable member that is inserted into the inner hole of the holding member and restricts the diameter of the locking projection to the inner diameter side,
A corrugated pipe joint, wherein the movable member is formed with a projecting portion that abuts the joint body at one end, and an axial notch is formed on the projecting portion.

Images