JP2009019645A - Insertion type pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow sealed connection in a single operation of only inserting a connection pipe, eliminate marking work of an insertion part on the connection pipe and allow easy check of insertion of the connection pipe for a predetermined length. <P>SOLUTION: A joint is constructed so that when the connection pipe 5 is inserted for the predetermined length, an indication member which projects in an outer surface of a joint body 2 before insertion of the connection pipe 5 is buried in the outer surface of the joint body 2 with movement of a seal ring 4 in an inward direction of the joint body 2. <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 type pipe joint, 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. Insufficient insertion may cause water leakage. 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.
Further, 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 by 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.

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 by simply inserting the connecting tube, and the insertion cost into the connecting tube can be reduced. It is an object of the present invention to provide a pipe joint that can be easily confirmed by human eyes for insertion of a predetermined length of a connecting pipe, and has excellent workability and reliability.
Another object of the present invention is to reduce the insertion force of the connecting pipe into the seal ring, to reduce the insertion load of the connecting pipe and to improve the insertion operability, and the end of the connecting pipe damages the seal ring. An object of the present invention is to provide a plug-in pipe joint that can be installed without being attached and can improve the sealing performance by a seal ring.

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 5 in order to facilitate understanding of the contents of the invention. In the plug-in type pipe joint in which the seal ring (4) is accommodated in the joint body (2) having the receiving port (6) into which the end of the joint member (2) is inserted, the indicator member (14) is attached to the joint body (2). Is attached to the outer surface of the joint body (2) so that the seal ring (4) is inserted into the inner end of the joint body (2) at the end of the connecting pipe (5) inserted from the receiving port (6). It is pushed and moved in the direction so as to provide a hermetic seal between the outer peripheral surface of the end of the connecting pipe (5) and the inner peripheral surface of the joint body (2), and before the connection pipe (5) is inserted, The indicator member (14) protruding on the outer surface of 2) is connected to the seal ring (4) after the connection pipe (5) is inserted. In which characterized in that with the movement of the innermost direction of the main body (2) is configured to retracted into the outer surface of the joint body (2).
According to the plug-type pipe joint having such a configuration, the outer peripheral surface of the end of the connection pipe (5) and the joint main body (2) can be formed by the seal ring (4) with a one-touch operation of inserting the connection pipe (5). The space between the inner peripheral surface and the inner peripheral surface can be hermetically sealed. In addition, since the indicator member (14) is immersed in the outer surface of the joint body (2) as the seal ring (4) and the joint body (2) are moved inwardly by inserting the connection pipe (5), the connection pipe Whether or not (5) has been inserted to a predetermined length can be easily confirmed by human eyes. In this way, since the inserted state of the indicating member (14) can be easily visually confirmed after the insertion of the connecting pipe (5) is completed, insufficient insertion of the connecting pipe (5) can be prevented beforehand, and the connection can be prevented. The marking work for the insertion allowance to the pipe (5) can be omitted, and the workability is excellent. After the insertion of the connecting pipe (5), if the indicator member (14) is in a state of being immersed in the outer surface of the joint body (2), the indicator member (14) may touch other objects after the construction to cause damage or the like. There will be no hindrance.

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 5 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). It is integrally formed in a shape having an annular sealing action portion (4c) which is connected in a protruding manner and has an inner diameter slightly equal to or slightly larger than the outer diameter of the connecting pipe (5). And a tapered taper (11d) narrowing toward the inner depth of the joint body (2) at the inner periphery of the intermediate part between the stopper (9) in the joint body (2) and the inside of the receiving port (6). ) And when the connecting pipe (5) is inserted into the joint body (2) to a predetermined length, the end of the connecting pipe (5) is inserted into the ring body (4a) and the pipe end receiving part (4b). Until the pipe end receiving part (4b) comes into contact with the stopper part (9), the entire seal ring (4) is pushed inward toward the inside of the joint body (2). Accordingly, the diameter of the sealing action part (4c) is reduced by the taper (11d), and the joint body (2) Constitute so as to be in close contact with the outer peripheral surface of the connection pipe under compressive action (5) between the outer peripheral surface of the peripheral surface and the connecting pipe (5),
Corresponding to the accommodation position of the seal ring (4) before the connection pipe (5) is inserted in the joint body (2), and the receiving port (6) from the moving position of the seal ring (4) by the insertion of the connection pipe (5). The indicator member (14) is mounted in a position corresponding to the position biased to the side, and the indicator member (14) moves inwardly in the joint body as the seal ring (4) moves in the joint body. It is characterized by being configured to be immersed in the outer surface of (2).

According to the plug-type pipe joint having such a configuration, the outer peripheral surface of the end of the connection pipe (5) and the joint main body (2) can be formed by the seal ring (4) with a one-touch operation of inserting the connection pipe (5). The space between the inner peripheral surface and the inner peripheral surface can be hermetically sealed. In addition, since the indicator member (14) is immersed in the outer surface of the joint body (2) as the seal ring (4) and the joint body (2) are moved inwardly by inserting the connection pipe (5), the connection pipe Whether or not (5) has been inserted to a predetermined length can be easily confirmed by human eyes. In this way, since the inserted state of the indicating member (14) can be easily visually confirmed after the insertion of the connecting pipe (5) is completed, insufficient insertion of the connecting pipe (5) can be prevented beforehand, and the connection can be prevented. The marking work for the insertion allowance to the pipe (5) can be omitted, and the workability is excellent. After the insertion of the connecting pipe (5), if the indicator member (14) is in a state of being immersed in the outer surface of the joint body (2), the indicator member (14) may touch other objects after the construction to cause damage or the like. There will be no hindrance.
Further, 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 slightly larger than the outer diameter of the connecting pipe (5), and the seal action part (4c) Can reduce the diameter by sliding the taper (11d) with little resistance, so that the entire seal ring (4) can be pushed and moved inward in the joint body (2) with a small insertion load of the connecting pipe (5). Excellent tube insertion operability.
Furthermore, the sealing action part (4c) continuously connected to 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 action part (4c) and the ring body part (4a) having an inner diameter that is the same as or slightly larger than the outer diameter of the connection pipe (5) are damaged at the end of the connection pipe (5). It will almost never be attached.

The plug-in type pipe joint according to claim 2 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 3. 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 2 or 3 corresponds to the accommodation position of the seal ring (4) before the connection pipe is inserted in the joint main body (2) and the connection pipe as described in claim 4. An entry / exit hole (13) is provided in a place corresponding to a position deviated from the moving position of the seal ring (4) to the receiving port (6) side by insertion, and an indication member (14) is provided in the entry / exit hole (13). ) Can be used so that it can be moved freely. According to such a configuration, the indicating member (14) can be stably and smoothly immersed under the guidance of the retracting hole (13).

  According to a fourth aspect of the present invention, in the plug-in type pipe joint, as described in the fifth aspect, the indicating member (14) is loosely fitted to the outer periphery of the seal ring (4) before the connection pipe (5) is inserted. As the joint body (2) in (4) moves inwardly and backwardly, the diameter of the seal ring (4) is removed from the outer periphery, and the diameter is reduced to change onto the outer peripheral surface of the connection pipe (5). Adopting a configuration in which a shape ring portion (14a) and a pin portion (14b) projecting from a part of the circumference of the C-shape ring portion (14a) and inserted into the intrusion hole (13) are formed. Can do. According to this configuration, the seal ring (4) is pushed and moved inwardly of the joint body (2) by the insertion of the connecting pipe (5) from the C-shaped ring portion (14a) of the indicating member (14). The pin portion (14b) which has been pushed out and thus has been transferred from the outer periphery of the seal ring (4) onto the outer peripheral surface of the connecting pipe (5) and protruded on the outer surface of the joint body (2). Is submerged and submerged in the intrusion hole (13). Therefore, the insertion operation of the indicating member (14) is reliably performed with the completion of the insertion of the connecting pipe (5). In addition, after the insertion of the connecting pipe (5) is completed, the indicator member (14) has the seal ring (4) on the outer peripheral surface of the connecting pipe (5) with the pin portion (14b) being inserted into and engaged with the retracting hole (13). Therefore, the seal ring (4) is reliably prevented from moving in the direction of the receiving port (6) by the internal pressure of the fluid flowing in the joint body (2). Also fulfills the backup function of ensuring performance.

  The plug-in type pipe joint according to any one of claims 2 to 5, as described in claim 6, has an outer periphery of the connecting 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 is possible to connect in a seal-like manner by simply inserting the connecting pipe, and it is easy to insert the connecting member into the predetermined length by immersing the indicating member. Since it can be confirmed, the marking work of the insertion allowance to the connecting pipe can be omitted, and the workability is excellent.
Moreover, according to the plug-in type pipe joint of the present invention, the seal ring can be pushed and moved with a small insertion load of the connecting pipe to improve the sealing performance at the seal action part, and the insertion operability is excellent, and the seal ring is damaged. It can be constructed without any advantage.

  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. 1, FIG. 4 is a cross-sectional view along line AA in FIG. 1, and FIG. 5 is a cross-sectional view along line BB in FIG.

  As shown in FIGS. 1 to 5, the plug-in type pipe joint 1 includes a joint main body 2, a retaining ring 3, a seal ring 4, and an indicating member 14 that are accommodated in the joint main body 2. .

  As shown in FIGS. 1 and 4, 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. A retaining ring accommodating groove 7 for accommodating the retaining ring 3 is formed on the inner surface of the groove 7, and a tapered surface 8 is formed on the inner peripheral surface of the groove 7 toward the outside of the receiving port (in the direction of tube extraction). Forming. 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 near 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. Note that the sealing action portion 4c integrally formed on the rear end side of the ring body portion 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. 7, 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. 8, the pipe 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 trunk portion 4a is a little harder than the rubber material. It can also be formed integrally with an equal semi-hard material.

  At the position corresponding to the accommodation position of the seal ring 4 before the connection pipe 5 is inserted in the joint body 2, an in / out hole 13 is provided in an inner / outer shape, and the indicating member 14 is mounted in the in / out hole 13 so as to be able to enter and exit. Yes. 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 recess / exit hole 13 has finished moving inwardly in the joint body 2. The position corresponding to between the rear end portion and the taper 11d is set.

  The indicating member 14 is formed in a shape having a C-shaped ring portion 14a made of plastic or metal, which can be expanded and contracted, and a pin portion 14b projecting from a part of the circumference of the C-shaped ring portion 14a. As shown in FIG. 1, the indicating member 14 loosely fits the C-shaped ring portion 14a on the outer periphery of the ring body portion 4a of the seal ring 4 in a state before the connection pipe 5 is inserted, so that the pin portion 14b Is inserted into the intrusion hole 13 so that the tip of the pin portion 14 b protrudes from the outer surface of the joint body 2. Note that the C-shaped ring portion 14 a communicates with the inner end opening of the intrusion hole 13 and is accommodated in a circumferential groove 15 formed over the inner periphery of the joint body 2. The protruding state of the pin portion 14 b from the intrusion hole 13 is held by the seal ring 4.

  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, as shown in FIGS. 2 and 5, when the connecting pipe 5 is further deeply inserted to a predetermined length, the seal ring 4 passes through the indicating member 14 at the end of the connecting pipe 5, and the pipe end receiving portion 4b is moved to the stopper portion. The seal body 4 is pushed into the inner part of the joint main body 2 until it is brought into contact with the outer peripheral surface 9. As a result, the diameter of the sealing action portion 4 c is reduced by the sliding contact with the taper 11 d of the stepped portion 11 c and the first recess A hermetically sealed state is obtained in which the groove 11 a is compressed with the inner peripheral surface of the groove 11 a and is in close contact with the outer peripheral surface of the connection pipe 5, and the engagement teeth 3 a of the retaining ring 3 are engaged with the outer peripheral surface of the connection pipe 5. A retaining state is obtained.

  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, as described above, when the connecting pipe 5 is inserted, the seal ring 4 is pushed out and moved inwardly of the joint body 2 and is pushed out from the C-shaped ring portion 14a of the indicating member 14, so that the connecting pipe 5 is predetermined. The C-shaped ring portion 14a of the indicating member 14 is transferred while being reduced in diameter from the ring body portion 4a of the seal ring 4 onto the outer peripheral surface of the connection pipe 5, and protrudes onto the outer surface of the joint body 2. The pin portion 14b that has been sunk is submerged and retracted into the intrusion hole 13 until the tip is substantially flush with the outer surface of the joint body 2. Therefore, after the insertion of the connecting pipe 5 is completed, it can be easily confirmed by human eyes whether or not the connecting pipe 5 has been inserted to a predetermined length by observing the immersion state of the pin portion 14b. In addition, after the insertion of the connecting pipe 5 is completed, the indicating member 14 is held and fixed at the rear position of the seal ring 4 on the outer peripheral surface of the connecting pipe 5 with the pin portion 14b being inserted into and engaged with the retracting hole 13. For this reason, the seal ring 4 is reliably prevented from moving in the direction of the receiving port 6 due to the internal pressure of the fluid flowing in the joint main body 2 and also serves as a backup function to ensure the sealing performance. If the tip of the pin portion 14b of the indicating member 14 is immersed in the outer surface of the joint body 2 after the insertion of the connecting pipe 5 is completed, it is avoided that other objects touch the pin portion 14b of the indicating member 14 after construction. Therefore, there is no risk of damaging other objects.

  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. The engagement force to the outer peripheral surface of the pipe 5 is increased. This reliably prevents the connecting pipe 5 from coming out.

  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 the sectional view on the AA line in FIG. It is the BB sectional view taken on the line in FIG. It is a half-broken sectional view of the seal ring of another embodiment. FIG. 6 is a half cutaway cross-sectional view of a seal ring of still another embodiment. Furthermore, it is a half-broken sectional view of a seal ring of another embodiment. 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 ditch | groove 11b 2nd ditch | groove 11c Step part 11d Taper 13 Intrusion hole 14 Instruction member 14a C-shaped ring part 14b Pin part

Claims (6)

  In a plug-in type pipe joint in which a seal ring is accommodated in a joint body having a receiving port into which an end of a connecting pipe is inserted, an indication member is mounted on the joint body so that the tip of the joint member protrudes from the outer surface of the joint body. The seal ring is pushed and moved in the inner depth direction of the joint body at the end of the connection pipe inserted from the receiving port, and the end outer peripheral surface of the connection pipe and the inner peripheral face of the joint main body And the indicator member protruding to the outer surface of the joint body before the connection pipe is inserted is moved along the inner and inner direction of the joint body of the seal ring. A plug-in type pipe joint characterized by being configured to be immersed in the outer surface of the main body. 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 inner depth of the joint body until contact is made, and the sealing action portion is reduced in diameter by the taper along with the movement, and the inner peripheral surface of the joint body and the outer periphery of the connection pipe It is configured to receive a compression action with the surface and adhere to the outer peripheral surface of the connecting pipe,
Instruct the joint body at a location corresponding to the position where the seal ring is accommodated before the connection pipe is inserted and the position where the seal ring is displaced from the moving position of the seal ring due to the insertion of the connection pipe. The member is mounted so as to be freely retractable, and the indicator member is configured to be immersed in the outer surface of the joint body as the seal ring moves in the interior direction of the joint body. Plug-in fittings.   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 movably accommodated in the axial direction. The seal ring housing groove is formed on a side facing the receiving port of the stopper portion, and is formed from an outer diameter of the connection pipe. A first concave groove having a large inner diameter and a second concave groove having an inner diameter larger than the inner diameter of the first concave groove formed between the receiving-side end of the first concave groove and the annular wall are formed. 3. 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. Plug-in fittings.   In the joint main body, in the location corresponding to the position where the seal ring is accommodated before the connection pipe is inserted and the position where the seal ring is displaced from the moving position of the seal pipe due to the insertion of the connection pipe, The insertion-type pipe joint according to claim 2 or 3, wherein the indicator member is provided so as to penetrate inside and outside, and the indicating member is mounted in the protruding and retracting hole so as to freely protrude and retract.   The indicator member is loosely fitted on the outer periphery of the seal ring before the connection pipe is inserted, and is removed from the seal ring and reduced in diameter as the seal ring moves inwardly in the joint body. A C-shaped ring portion that is freely expandable / reducible in diameter and changes on the outer peripheral surface of the tube, and a pin portion that protrudes from a part of the circumference of the C-shaped ring portion and is inserted into the intrusion hole. Item 5. The plug-in type pipe joint according to item 4. 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 2 to 5, which is provided in a shape.

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