JP2009019644A - Insertion type pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce an insertion load of a connection pipe and allow construction without making a scratch or the like on a seal ring by an end of the connection pipe. <P>SOLUTION: When the connection pipe 5 is inserted in a joint body 2 to a predetermined length, the end of the connection pipe 5 is put in a ring barrel 4a of the seal ring 4 until abutting against a pipe end receiving part 4b and pushes the entire seal ring 4 inward the joint body 2 until the pipe end receiving part 4b abuts against a stopper part 9. Based on this, a seal action part 4c is reduced in diameter by a taper 11d and is subjected to a compression action between an inner peripheral surface of a first recessed groove 11a and an outer peripheral surface of the connection pipe 5 into close contact with the outer peripheral surface of the connection pipe 5. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a plug-in type pipe joint used for connecting a connecting pipe such as a gas pipe, a water supply pipe or a hot water supply pipe with one touch.

As this type of one-touch plug-in pipe joint, for example, as shown in FIG. 9, a receiving port 22 into which the end of the connection pipe 21 is inserted is provided at the end of the joint body 20. A pipe end stopper 23 projects radially inwardly from the inside, and a retaining ring 24 that can be expanded and contracted in the inside of the receiving port 22, and this retaining ring 24 and the pipe end stopper 23. A rubber seal ring 25 that is freely expandable / reduced in diameter is housed in a fixed position between them, and the inner diameter of the receiving port 22 in contact with the retaining ring 24 is reduced to the retaining ring 24. In some cases, the tapered surface 26 for applying the above force is provided in a constricted shape in the tube extraction direction (see, for example, Patent Documents 1 and 2).
According to this plug-in type pipe joint, as shown in FIG. 10, when the end of the connection pipe 21 is inserted into the receiving port 22 of the joint body 20, between the outer surface of the connection pipe 21 and the inner surface of the joint body 20. When the seal ring 25 is compressed, the seal ring 25 is sealed, and the inner diameter portion of the retaining ring 24 bites into the outer surface of the connection pipe 21, whereby the connection state between the joint body 20 and the connection pipe 21 is maintained. When a pulling force acts on the connecting pipe 21 in this connected state, the retaining ring 24 is reduced in diameter by the tapered surface 26 on the inner periphery of the receiving port 22 to increase the biting into the outer surface of the connecting pipe 21. The withdrawal is prevented.

Japanese Patent Laid-Open No. 10-160071 Japanese Patent Laid-Open No. 2003-14169

However, in the conventional plug-in pipe joint in which the inner diameter of the seal ring 25 is smaller than the outer diameter of the connection pipe 21 in order to improve the surface pressure due to compression of the seal ring 25, the connection pipe 21 is manually set. When inserted into the joint body 20, the insertion force of the connection pipe 21 into the seal ring 25 tends to be excessive, and the insertion operability of the connection pipe 21 is difficult. Further, when the connecting pipe 21 is inserted, the seal ring 25 is damaged at the outer edge of the end face of the connecting pipe 21, and the sealing function by the seal ring 25 is adversely affected.
Further, after the connection pipe 21 is completely inserted into the joint body 20, it cannot be easily confirmed whether or not the connection pipe 21 has been inserted to a predetermined length. For this purpose, in general, before inserting the connecting pipe 21 into the joint body 20, as shown in FIG. 9, the marking 27 for the insertion allowance is made with a magic ink or the like at a predetermined position at a predetermined distance from the end of the end of the connecting pipe 21. However, the work of marking the insertion allowance on the connecting pipe 21 at the site was extremely troublesome.

  The present invention has been made to solve such problems, and the object of the present invention is that it can be connected in a seal-like manner with a one-touch operation just by inserting the connecting pipe, and to the sealing ring of the connecting pipe. The insertion force of the connecting pipe is reduced, the insertion load of the connecting pipe is reduced, and the insertion operability is excellent, and the end of the connecting pipe can be installed without damaging the seal ring, and the seal ring improves the sealing performance. It is to provide a type pipe joint. Another object of the present invention is to provide a pipe joint that eliminates the marking work of the insertion allowance to the connecting pipe, can easily confirm the insertion of the predetermined length of the connecting pipe with human eyes, and is excellent in workability and reliability. It is in.

  The plug-in type pipe joint according to the present invention will be described with reference to the reference numerals attached to FIGS. 1 to 3 in order to facilitate understanding of the contents of the invention. ) Is provided with a receiving port (6) into which the end of the connecting pipe (5) is inserted, and a stopper portion (9) is projected radially inwardly at the inner periphery of the receiving port (6). In the plug-in type pipe joint in which the seal ring (4) is accommodated and disposed between the inside of the receiving port (6) and the stopper portion (9), the seal ring (4) is connected to the connection pipe (5 ), A cylindrical ring body (4a) having an inner diameter that is the same as or slightly larger than the outer diameter of the connecting pipe (5), and inward toward the front end of the ring body (4a) A pipe end receiving portion (4b) having an inner diameter smaller than the outer diameter of the connecting pipe (5) and a rear end side of the ring body portion (4a). An annular sealing action portion (4c) having an inner diameter that is the same as or slightly larger than the outer diameter of the connecting pipe (5) and that can be expanded and contracted, and is formed into a joint A tapered taper (11d) is provided in the inner periphery of the intermediate portion between the stopper (9) in the main body (2) and the interior of the receiving port (6) toward the inner depth of the joint main body (2). When the connecting pipe (5) is inserted into the joint body (2) to a predetermined length, the end of the connecting pipe (5) comes into contact with the pipe end receiving part (4b) in the ring body (4a). Until the tube end receiving portion (4b) contacts the stopper portion (9), the entire seal ring (4) is pushed inwardly toward the inside of the joint body (2), and the sealing action is accompanied by the movement. The portion (4c) is reduced in diameter by the taper (11d) and the inner peripheral surface of the joint body (2) Those having features that are configured so as to be in close contact with the outer peripheral surface of the connection pipe under compressive action between the outer peripheral surface of the connection tube (5) (5).

According to the plug-in type pipe joint having such a configuration, the inner diameters of the seal action part (4c) and the ring body part (4a) of the seal ring (4) are the same as or outside the outer diameter of the connection pipe (5). The seal action part (4c) is made slightly larger than the diameter, and the taper (11d) is slid with a small resistance to reduce the diameter. It can be pushed and moved inwardly and deeply, making it easy to insert the connecting pipe.
Moreover, the sealing action part (4c) connected in a protruding manner outwardly on the rear end side of the ring body part (4a) is formed between the inner peripheral surface of the joint body (2) and the outer peripheral surface of the connection pipe (5). Since the surface pressure is increased by being compressed between the two, the hermetic sealing performance can be enhanced.
Further, the sealing tube (4c) and the ring body (4a) having an inner diameter that is the same as or slightly larger than the outer diameter of the connecting pipe (5) are damaged at the end of the connecting pipe (5). There is almost no sticking.

The plug-in type pipe joint according to claim 1 is connected to the inner periphery of the intermediate part between the stopper part (9) in the joint body (2) and the inside of the receiving port (6), as described in claim 2. An annular wall (10) having an inner diameter larger than the outer diameter of the pipe (5) is provided, and the seal ring (4) is movable in the axial direction on the inner periphery between the annular wall (10) and the stopper portion (9). A seal ring receiving groove (11) is formed, and the seal ring receiving groove (11) is formed on the side of the stopper portion (9) facing the receiving port (6) and is formed outside the connecting pipe (5). The first concave groove (11a) having an inner diameter larger than the diameter, and formed between the receiving-side end of the first concave groove (11a) and the annular wall (10), is larger than the inner diameter of the first concave groove (11a). A step (11c) is formed between the first groove (11a) and the second groove (11b). Is formed, it is possible to adopt a configuration of providing the Subomari tapered toward the first groove (11a) on the step portion (11c) (11d).
According to such a configuration, the entire seal ring (4) can be stably pushed and moved in the inner direction of the joint body (2) with a small insertion load of the connecting pipe (5). Further, the sealing action part (4c) is reduced in diameter by the taper (11d) with the movement, and the compression action is surely performed between the inner peripheral surface of the first concave groove (11a) and the outer peripheral surface of the connection pipe (5). And adheres closely to the outer peripheral surface of the connecting pipe (5).

  The plug-in type pipe joint according to claim 1 or 2 corresponds to the accommodation position of the seal ring (4) of the joint body (2) before the connection pipe is inserted, as described in claim 3, and the connection pipe insertion. It is possible to adopt a configuration in which the confirmation hole (13) is provided in a penetrating manner at a position corresponding to a position that is deviated from the moving position of the seal ring (4) to the receiving port (6) side. According to such a configuration, after the insertion of the connection pipe (5) is completed, the seal ring (4) passes through the confirmation hole (13) and becomes invisible from the confirmation hole (13), thereby the connection pipe (5) is removed. It can be easily confirmed by human eyes whether or not a predetermined length has been inserted. Thus, since the presence or absence of the seal ring (4) can be easily confirmed visually through the confirmation hole (13) after the insertion of the connection pipe (5) is completed, insufficient insertion of the connection pipe (5) is obviated. It can be prevented, and the marking work of the insertion allowance to the connecting pipe (5) can be omitted, and the workability is excellent.

  The plug-in type pipe joint according to any one of claims 1 to 3, as described in claim 4, has an outer periphery of the connection pipe (5) inside the receiving port (6) of the joint body (2). A taper surface (8) that accommodates a retaining ring (3) that is freely expandable and contractible to engage the surface, and that acts on the retaining ring (3) in the diameter reducing direction on the inner periphery of the receiving port (6). It is possible to adopt a configuration in which the tube is provided in a constricted shape in the tube extraction direction. According to such a configuration, the connection pipe (5) can be connected in a retaining shape with a single touch by simply inserting the connection pipe (5). Further, after the insertion of the connecting pipe (5) is completed, when a pulling force is applied to the connecting pipe (5), the retaining ring (3) that accompanies the connecting pipe (5) becomes the tapered surface (8) of the receiving port (6). ), The retaining ring (3) is reduced in diameter, and the engagement force to the outer peripheral surface of the connecting pipe (5) is increased. This reliably prevents the connecting pipe (5) from coming out.

  According to the plug-in type pipe joint of the present invention, it can be connected in a seal shape by a one-touch operation by simply inserting the connecting pipe, and the seal ring is pushed and moved with a small insertion load of the connecting pipe, and the sealing action part seals the seal. It is advantageous in that it can improve performance, has excellent insertion operability, and can be installed without damaging the seal ring.

  FIG. 1 is a half cutaway cross-sectional view showing a plug-in pipe joint according to an embodiment of the present invention before the connection pipe is inserted, and FIG. 2 is a half view showing the plug-in pipe joint after the connection pipe is completely inserted. FIG. 3 is a plan view of the plug-in type pipe joint in FIG.

  As shown in FIGS. 1 to 3, the plug-in type pipe joint 1 includes a joint body 2 and a retaining ring 3 and a seal ring 4 that are accommodated in the joint body 2.

  The joint body 2 is formed in a cylindrical shape, and an opening 6 into which an end of the connection pipe 5 is inserted is opened at one end in the axial direction of the joint body 2, and a retaining ring 3 is accommodated on the inner periphery of the receiving port 6. A concave groove 7 for retaining the retaining ring is formed, and a tapered surface 8 which is narrowed toward the outer side of the receiving port (in the direction of tube extraction) is formed on the inner peripheral surface of the concave groove 7. An annular stopper portion 9 having an inner diameter smaller than the outer diameter of the connecting pipe 5 is projected inward in the radial direction from the inner periphery of the joint body 2 in the vicinity of the center in the axial direction. An annular wall 10 having an inner diameter larger than the outer diameter of the connecting pipe 5 is provided on the inner periphery of the intermediate portion between the seal ring 4 and the seal ring 4 so as to be movable in the axial direction on the inner periphery between the annular wall 10 and the stopper portion 9. A seal ring receiving groove 11 to be stored is formed. The stopper portion 9 is not limited to being formed integrally with the joint body 2, and an annular stopper portion 9 is formed separately from the joint body 2, and is fitted and fixed to the inner periphery of the joint body 2 near the center in the axial direction. You may do. A connecting male screw 12 is formed on the outer periphery of the other end of the joint body 2.

  The retaining ring 3 is formed of a harder stainless steel or the like than the connection pipe 5 in a C shape that can be expanded and contracted, and an engagement tooth 3 a having an inner diameter smaller than the outer diameter of the connection pipe 5 is formed on the inner diameter portion thereof. .

  The seal ring housing groove 11 is formed on the side of the stopper portion 9 facing the receiving port 6 and has a first groove 11a having an inner diameter larger than the outer diameter of the connecting tube 5, and the receiving groove 6 side of the first groove 11a. The second concave groove 11b is formed between the end and the annular wall 10 and has an inner diameter larger than the inner diameter of the first concave groove 11a. A step portion 11c is formed between the first groove 11a and the second groove 11b, and a taper 11d that narrows toward the first groove 11a is provided in the step portion 11c.

  The seal ring 4 has a cylindrical ring body 4a having an inner diameter that is the same as or slightly larger than the outer diameter of the connecting pipe 5, and an inward connection to the front end side of the ring body 4a. A pipe end receiving portion 4b having an inner diameter smaller than the outer diameter of the ring body 4a and an outwardly projecting shape on the rear end side of the ring body portion 4a. The inner diameter is the same as or slightly larger than the outer diameter of the connecting pipe 5. It is integrally formed in a shape having an annular sealing action portion 4c having an outer diameter larger than the inner diameter of one concave groove 11a and which can be expanded and contracted. As shown in FIG. 1, before the connection pipe 5 is inserted, the seal ring 4 has the ring body 4a in the first groove 11a of the seal ring receiving groove 11 and the seal action part 4c in the second groove 11b. It is accommodated so that it may each fit in. The sealing action portion 4c integrally formed on the rear end side of the ring body 4a is not limited to being provided on one line as shown in FIG. 1, but may be provided integrally with two or more lines arranged as shown in FIG. .

  The seal ring 4 is not limited to being integrally formed of the same rubber material as a whole. As shown in FIG. 5, the ring body 4a and the pipe end receiving portion 4b are sealed with a hard material such as plastic or metal such as PP or PE. Only the action part 4c may be integrally formed of a rubber material. Further, as shown in FIG. 6, general-purpose engineering plastic in which the tube end receiving portion 4b is made of a hard material such as metal, the one or more sealing action portions 4c are made of a rubber material, and the ring body portion 4a is slightly harder than the rubber material. It can also be formed integrally with an equal semi-hard material.

  A confirmation hole 13 is formed in the joint body 2 at a position corresponding to the position where the seal ring 4 is accommodated before the connection pipe 5 is inserted. Therefore, before the connection pipe 5 is inserted, the seal ring 4 can be seen through the confirmation hole 13 and its presence can be confirmed. As will be described later, the seal ring 4 is pushed inwardly into the joint body 2 by the insertion of the connecting pipe 5, but the installation location of the confirmation hole 13 has finished moving in the inward direction of the joint body 2. It is set so as to correspond to a position biased toward the receiving port 6 rather than the position of the rear end. One or more confirmation holes 13 are provided in the circumferential direction of the joint body 2, but may be formed in a circular shape in plan view as shown in FIG. 3 or long in the circumferential direction as shown in FIGS. 7 and 8. It is optional to form a long hole.

  Next, the connection procedure of the connecting pipe 5 by the plug-in type pipe joint 1 having the above-described configuration will be described.

  The end of the connecting pipe 5 is inserted into the receiving port 6 of the joint body 2. At this time, the end of the connecting pipe 5 slides the tip of the engaging tooth 3 a of the retaining ring 3 to expand the retaining ring 3. Then, it passes through the seal acting part 4c and the ring body part 4a of the seal ring 4 and comes into contact with the pipe end receiving part 4b. Subsequently, when the connecting pipe 5 is further deeply inserted to a predetermined length, the joint body 2 until the seal ring 4 passes through the confirmation hole 13 at the end of the connecting pipe 5 and the pipe end receiving portion 4b is brought into contact with the stopper portion 9. While being pushed inwardly, the sealing action part 4c is reduced in diameter by the sliding contact action with the taper 11d of the step part 11c, so that the gap between the outer peripheral face of the connecting pipe 5 and the inner peripheral face of the first concave groove 11a is reduced. A seal seal state is obtained in which the engagement teeth 3a of the retaining ring 3 are engaged with the outer peripheral surface of the connection pipe 5 (FIG. 2). reference).

  When the connecting pipe 5 is inserted, the inner diameters of the sealing action part 4c and the ring body part 4a of the seal ring 4 are the same as or slightly larger than the outer diameter of the connecting pipe 5, and the sealing action part 4c Since the diameter can be easily reduced by sliding the taper 11d with less resistance, the seal ring 4 can be pushed and moved inwardly of the joint body 2 with a small insertion load of the connection pipe 5, and the connection pipe 5 Excellent insertion operability. Further, the sealing action part 4c is connected to the rear end side of the ring body part 4a so as to project outward, and is compressed between the inner peripheral surface of the joint body 2 and the outer peripheral surface of the connecting pipe 5 to reduce the surface pressure. Therefore, the sealing performance between the inner peripheral surface of the joint body 2 and the outer peripheral surface of the connection pipe 5 can be improved. Furthermore, since the inner diameter of the sealing portion 4c and the ring body 4a is formed to be the same as or slightly larger than the outer diameter of the connection pipe 5, it is possible to prevent scratching at the end of the connection pipe 5.

  Further, when a pulling force is applied to the connecting pipe 5 after the connecting pipe 5 is completely inserted, the retaining ring 3 that accompanies the connecting pipe 5 is brought into contact with the constricted side of the taper surface 8 to reduce the diameter. Engagement force on the outer peripheral surface of the tube 5 is increased. This reliably prevents the connecting pipe 5 from coming out.

  After the insertion of the connecting pipe 5 is completed, the seal ring 4 passes through the confirmation hole 13 and disappears from the confirmation hole 13, so that it can be easily confirmed by human eyes whether or not the connecting pipe 5 has been inserted to a predetermined length. .

  In the above embodiment, the male thread adapter plug-in type pipe joint in which the male thread 12 for connection is formed on one side of the joint body 2 has been described. However, the present invention is not limited to this, and other structures such as symmetrical sockets are provided. Needless to say, the present invention can also be applied to a plug-in type fitting, an elbow type fitting and the like. Further, the connecting pipe 5 is not limited to a metal pipe such as a stainless steel pipe, but can be applied to a connecting pipe made of resin, for example, a connecting pipe made of vinyl chloride.

It is a half notched cross-sectional view showing the plug-in type pipe joint of one embodiment of the present invention in a state before inserting the connecting pipe. It is a half notched cross-sectional view showing the plug-in type pipe joint in a state after completion of connecting pipe insertion. It is a top view of the plug-in type pipe joint in FIG. It is a half notched cross-sectional view which shows the plug-in type pipe joint of another Example corresponding to FIG. FIG. 7 is a half-broken cross-sectional view showing a plug-in type pipe joint of still another embodiment corresponding to FIG. 1. Furthermore, it is a half notched cross-sectional view showing the plug-in type pipe joint of another embodiment corresponding to FIG. It is a top view which shows the plug-in type pipe joint of another Example corresponding to FIG. It is a top view which shows the plug-in type pipe joint of further another Example corresponding to FIG. It is a half notched cross-sectional view showing the plug-in type pipe joint of the conventional example in a state before inserting the connecting pipe. FIG. 10 is a half-broken cross-sectional view showing the plug-in type pipe joint of FIG. 9 in a state after the connection pipe insertion is completed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plug-in type pipe joint 2 Joint main body 3 Stop ring 4 Seal ring 4a Ring trunk | drum 4b Pipe end receiving part 4c Sealing action part 5 Connection pipe 6 Receptacle 8 Tapered surface 9 Stopper part 10 Annular wall 11 Seal ring accommodation recessed groove 11a 1st groove 11b 2nd groove 11c Step part 11d Taper 13 Confirmation hole

Claims (4)

The joint body is provided with a receiving port into which the end of the connecting pipe is inserted, and a stopper is projected radially inwardly on the inner periphery of the receiving port. In the plug-in type pipe fitting that houses and arranges the seal ring between the stopper part,
The seal ring has a cylindrical ring body having an inner diameter that is the same as or slightly larger than the outer diameter of the connection pipe, and inwardly toward the front end side of the ring body before the connection pipe is inserted. A pipe end receiving portion having an inner diameter smaller than the outer diameter of the connection pipe and a rear end side of the ring body portion protruding outwardly to be the same as or slightly smaller than the outer diameter of the connection pipe It is formed into a shape having an annular sealing action part that has a large inner diameter and can be expanded and contracted,
In the inner periphery of the intermediate portion between the stopper portion and the inside of the receiving port in the joint body, a tapered taper is provided toward the inner direction of the joint body,
When the connection pipe is inserted into the joint body to a predetermined length, the end of the connection pipe is inserted into the ring body until it abuts against the pipe end receiving part, and the pipe end receiving part contacts the stopper part. The entire seal ring is pushed and moved toward the inside of the joint main body until it comes into contact, and the seal action portion is reduced in diameter by the taper along with the movement, and the inner peripheral surface of the joint main body and the outer peripheral surface of the connecting pipe A plug-type pipe joint, characterized in that it is configured so as to be in close contact with the outer peripheral surface of the connecting pipe under a compression action.   An annular wall having an inner diameter larger than the outer diameter of the connection pipe is provided in the inner periphery of the intermediate portion between the stopper portion in the joint body and the receiving port, and the inner periphery between the annular wall and the stopper portion. A seal ring housing groove is formed in which the seal ring is housed so as to be movable in the axial direction. The seal ring housing groove is formed on the side of the stopper portion facing the receiving port, and has an outer diameter. A shape having a first groove having a larger inner diameter, and a second groove having an inner diameter larger than the inner diameter of the first groove formed between the receiving end of the first groove and the annular wall. A step portion is formed between the first groove and the second groove, and the step portion is provided with the taper tapered toward the first groove. The plug-type pipe joint according to 1.   A confirmation hole is provided at a location corresponding to a position of the joint body corresponding to a position where the seal ring is accommodated before the connection pipe is inserted and a position shifted from the moving position of the seal ring due to the insertion of the connection pipe toward the receiving port. The plug-in type pipe joint according to claim 1 or 2, wherein the inner and outer through holes are provided. A retaining ring that can be expanded and contracted is accommodated inside the receiving port, and a tapered surface that applies a force in the diameter reducing direction to the retaining ring is constricted in the tube extraction direction on the inner periphery of the receiving port. The plug-in type pipe joint according to any one of claims 1 to 3, which is provided in a shape.

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