JP2005076854A - Socket-and-spigot type pipe fitting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easy-to-handle socket-and-spigot type pipe fitting allowing a connection pipe once stopped to be again inserted continuously even in case one end of the connection pipe is tried to be drawn off upon once being stopped on the way of insertion by introducing such a structure that no gap is produced between the end of the connection pipe and an insertion guide ring. <P>SOLUTION: A slipoff preventive accommodation recess 13 is formed between the front open end face of a spacer 15 fitted in a ring holding cylinder 7 movably in the axial direction and a tapered surface 14. A resilient seal ring 17 to be in tight attachment to the inside surface of the connection pipe P is fitted in a seal ring groove 16 at the periphery of a guide cylinder, and an insertion guide ring 18 is set in a connection pipe socket 9 in such a way as moving toward the innermost in the socket 9 while it compresses the resilient seal ring 17 in association with being pushed by one end of the connection pipe P. A resilient member 12 is interposed between the rear open end face of the spacer 15 and the pipe fitting body 1, and a slipoff preventive ring 11 is pressed to the tapered surface 14 at all times by the resilient member through the spacer 15. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a plug-in pipe joint that is used for hot water supply / water supply piping and the like and can be connected in a sealing shape and a retaining shape only by inserting one end of a connection pipe.

  As such a plug-in type pipe joint, the applicant previously proposed the one shown in FIG. 7 (Japanese Patent Application No. 2003-020442). The plug-in type pipe joint includes a joint main body 21 including an elastic seal ring 22, a retaining ring 23, and an insertion guide ring 24. The joint body 21 is formed with a guide tube 25 protruding from one end portion thereof in the axial direction, and a retaining ring that covers the outer periphery of the guide tube 25 via a connection tube receiving port 26 that receives one end portion of the connection tube P. The rear end portion of the holding cylinder 27 is screwed and coupled to the external thread 28 on the outer periphery of one end portion of the joint body 21. On the inner periphery of the retaining ring holding cylinder 27 on the front opening end side, the retaining ring 23 having a biting tooth 23a that bites and engages with the outer peripheral surface of the connecting pipe P is used to reduce the diameter of the retaining ring 23. A taper surface 29 is formed so as to narrow toward the front opening end of the retaining ring holding cylinder 27. A retaining ring receiving recess 30 in which the retaining ring 23 is accommodated inside the retaining ring holding cylinder 27 is formed on the front opening end surface of the cylindrical spacer 31 fitted in the retaining ring retaining cylinder 27 and a tapered surface 29. Is formed between. A seal ring groove 32 is provided on the outer periphery of the guide tube 25, and an elastic seal ring 22 that is in close contact with the inner peripheral surface of the connection pipe P is fitted into the seal ring groove 32. The insertion guide ring 24 is incorporated in the connection tube receiving port 26 so as to move inward of the connection tube receiving port 26 while compressing the elastic seal ring 22 as it is pushed at one end of the connection tube P. .

  As shown in FIG. 8, the insertion-type pipe joint configured as described above is configured so that the insertion guide ring 24 is inserted into the connection pipe receptacle 26 as one end of the connection pipe P is inserted into the connection pipe receptacle 26. The elastic seal ring 22 is pushed into the seal ring groove 32 while being compressed by the taper 26a of the inner diameter portion of the insertion guide ring 26 toward the inner side in the axial direction. Even if the inner periphery is not chamfered, the connecting pipe P is smoothly inserted without sticking to the elastic seal ring 22.

  The correct insertion operation of the connection pipe P into the plug-in type pipe joint is to keep pushing the connection pipe P until one end reaches the back of the connection pipe receiving port 26. However, as shown in FIG. Therefore, an erroneous operation may be performed in which the connecting pipe P is stopped from being pushed in the middle of insertion and is pulled back. However, in the plug-in type pipe joint, as shown in FIG. 7, a clearance S is formed between the retaining ring 23 and the tapered surface 29. Once the insertion is stopped and the connection pipe P is pulled out, the connection pipe P can be pulled out by the amount of the clearance S, but beyond that, the retaining ring 23 is already in contact with the tapered surface 29 and the diameter is reduced. Since it bites into the outer periphery of the connecting pipe P, it cannot be extracted. However, a gap G is formed between the insertion guide ring 26 that has already passed through the elastic seal ring 22 and one end of the connecting pipe P even if it is pushed in again, and the gap G is outside the elastic seal ring 22. Since a part of the circumference protrudes due to the elastic restoring action, the connecting pipe P cannot be pushed in, and a problem arises that the connecting pipe P cannot be moved in either the insertion direction or the extraction direction.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a plug-in tube having a joint body including an elastic seal ring, a retaining ring, and an insertion guide ring as described above. An easy-to-handle insert that prevents the insertion guide ring and one end of the connection pipe from having a gap even if it is pushed in the middle of the connection pipe insertion, so that the insertion of the connection pipe can be continued again. It is to provide a type pipe joint.

The plug-in type pipe joint as a premise of the present invention includes an elastic seal ring, a retaining ring, an insertion guide ring, a retaining ring holding cylinder, and a spacer in the joint body, and the joint body is formed from one end portion thereof. The guide tube is formed so as to protrude outward in the axial direction, and the rear end portion of the retaining ring holding tube that covers the outer periphery of the guide tube via the connection tube receiving port that receives the one end portion of the connection tube is one end portion of the joint body Screwed to the outer periphery of the retaining ring, and the retaining ring having an inner diameter portion that bites into and engages with the outer peripheral surface of the connecting pipe on the inner periphery of the front opening end side of the retaining ring holding cylinder. A tapered surface for reducing the diameter of the retaining ring is formed in a narrowed shape toward the front opening end of the retaining ring holding cylinder, and the retaining ring is accommodated in the retaining ring retaining cylinder. Lock ring collection A recess is formed between the front opening end surface of the cylindrical spacer that is fitted in the retaining ring holding cylinder so as to be movable in the axial direction, and the tapered surface. A seal ring groove is provided, and the elastic seal ring that is in close contact with the inner peripheral surface of the connection pipe is fitted into the seal ring groove, and the insertion guide ring is elastically moved as it is pushed at one end of the connection pipe. The seal ring is incorporated in the connection pipe receptacle so as to move toward the inner side of the connection pipe receptacle while compressing the seal ring.
In addition, the present invention is characterized in that an annular elastic member that constantly presses and biases the retaining ring against the tapered surface is incorporated in the retaining ring holding cylinder.

As a preferred embodiment, the plug-in type pipe joint according to the present invention is such that the elastic member is interposed between the rear opening end face of the spacer and the joint main body side so that the retaining ring is always on the tapered surface. The spacer may be pressed through the spacer, or may be interposed between the front opening end surface of the spacer and the retaining ring so that the retaining ring is always pressed against the tapered surface.
Further, the elastic member can be constituted by an annular rubber plate or a wave spring washer. Further, the insertion guide ring may be provided with an elastic protrusion that is slidable on the inner surface of the spacer on the outer periphery thereof.

According to the plug-in type pipe joint having the above-described configuration of the present invention, the insertion guide ring is pushed toward the inner side of the connection pipe receptacle as one end of the connection pipe is inserted into the connection pipe receptacle. In order to compress the ring, even if the inner periphery of one end of the connection pipe is not chamfered in advance, the connection pipe is smoothly inserted without sticking to the elastic seal ring.
At that time, the retaining ring is always pressed indirectly against the tapered surface by the annular elastic member through the spacer or directly between the retaining ring and the tapered surface as shown in FIG. Since the clearance S and the tapered surface are always in contact with each other without the clearance S as in the prior art, even if the insertion is temporarily stopped and a pulling force is applied to the connection pipe during the insertion of the connection pipe, As shown in FIG. 9, there is no gap G between the insertion guide ring 26 and one end of the connection pipe P, and the contact state between the insertion guide ring and one end of the connection pipe can be maintained. Thus, the connecting tube can still be inserted.

  Also, in the middle of insertion after one end of the connecting pipe has passed through the retaining ring, once the insertion is stopped and a pulling force is applied to the connecting pipe, the retaining ring strongly contacts the tapered surface and the diameter is reduced. In addition, the diameter reduction further increases the biting into the outer peripheral surface of the connecting pipe, so that the pulling out of the connecting pipe is reliably prevented.

  When one end of the connection pipe is inserted to the back of the connection pipe receptacle, the space between the inner peripheral surface of the connection pipe and the guide tube is sealed by the elastic seal ring, thereby preventing water leakage. Further, after insertion of the connecting pipe, even if a pulling force is applied to the connecting pipe, the retaining ring strongly abuts the tapered surface to reduce the diameter and further increases the biting into the outer peripheral surface of the connecting pipe. It can be prevented from coming out of the connection tube receptacle.

  If the outer periphery of the insertion guide ring is provided with an elastic protrusion that can slide against the inner surface of the spacer, the insertion guide ring will contact the elastic protrusion and the inner surface of the spacer even if the insertion is temporarily stopped during the insertion of the connecting pipe. Since the friction force generated between the surfaces securely stops and holds the spacer in the spacer, the insertion guide ring does not move freely in the spacer in the connecting tube insertion direction. In this case, the elastic member is interposed between the rear opening end surface of the spacer and the joint main body side, and by adopting a configuration in which the retaining ring is always pressed against the tapered surface via the spacer, Even after the insertion of the connecting pipe is stopped, it is advantageous in continuing to insert the connecting pipe. That is, when the insertion of the connecting pipe is stopped halfway, and the pulling force is applied to the connecting pipe, the retaining ring is slightly moved in the pulling direction of the connecting pipe while abutting the taper surface and reducing the diameter. Even if the retaining ring moves slightly in the direction of pulling out the connecting pipe, the insertion guide ring is moved in the same direction as the direction of pulling out the connecting pipe together with the spacer that is pushed and moved in the pulling direction of the connecting pipe by the elastic force of the elastic member. The insertion guide ring and one end of the connection pipe are not separated from each other, and the contact state between the two can be maintained, and it is extremely advantageous for continuing to insert the connection pipe after the connection pipe is once stopped. Become.

  A preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a half-notch cross-sectional view showing the plug-in type pipe joint in a state before the connection pipe is inserted, FIG. 2 is a half-notch cross-sectional view showing the plug-in type pipe joint in FIG. FIG. 2 is a half-cut cross-sectional view showing the plug-in type pipe joint of FIG. 1 in a state after insertion of a connecting pipe.

  In FIG. 1, the plug-in type pipe joint includes a joint main body 1 including a retaining ring holding cylinder 7, a retaining ring 11, a spacer 15, an elastic seal ring 17, and an insertion guide ring 18.

  The joint body 1 is formed of a metal such as a bronze casting and is formed into a cylindrical shape, and the fluid passage 2 is formed in a penetrating shape in the axial direction. An opaque guide ring is formed from one axial end (front end) of the joint main body 1. The concealment cylinder 5 is integrally formed so as to protrude outward (forward) in the axial direction in parallel with the central axis O of the fluid passage 2 and from the inside of the guide ring concealment cylinder 5 at one end of the joint body 1. A longer guide tube 3 is formed so as to be concentric with the guide ring concealing tube 5 so as to protrude outward in the axial direction, and a fluid passage 2 is formed in the guide tube 3 in communication therewith. An insertion guide ring entry space 4 is formed between the outer periphery of the guide tube 3 and the inner periphery of the guide ring concealing tube 5. A male screw 6 is provided on the outer periphery of the joint body 1. The insertion guide ring entry space 4 has an axial depth that is the same as or deeper than the axial length of the insertion guide ring 18.

  The retaining ring holding cylinder 7 is formed in a cylindrical shape with a transparent or semi-transparent resin having excellent heat resistance, such as PPSU (polyphenylsulfone sun), PPE (polyphenylene ether), polycarbonate, ABS resin, and the like, and the inside can be seen through. A female screw 8 is provided on the inner periphery of the rear end. The retaining ring holding cylinder 7 is screwed and coupled with the female thread 8 to the male thread 6 of the joint body 1. Between the inner periphery of the retaining ring retaining cylinder 7 and the outer periphery of the guide cylinder 3, a resin such as polybutene or crosslinked polyethylene is used. A connection pipe receiving port 9 for receiving one end of the connection pipe P made of metal or metal is formed so as to communicate with the insertion guide ring entry space 4. A male screw 10 is cut on the outer periphery of the other end (rear end) in the axial direction of the joint body 1, and a water faucet or an elbow with a female screw (not shown) is screwed into the male screw 10.

  On the inner peripheral surface of the retaining ring holding cylinder 7 on the front opening end side, a tapered surface 14 for applying a force in the diameter reducing direction to the retaining ring 11 is narrowed toward the front opening end of the retaining ring holding cylinder 7. Is formed. An annular retaining ring accommodating recess 13 for accommodating the retaining ring 11 is formed on the inner periphery of the tapered surface 14 of the retaining ring holding cylinder 7. The retaining ring housing recess 13 is fitted into the retaining ring holding cylinder 7 by a cylindrical spacer 15 that is transparent or translucent and transparent to the inside so as to be movable in the axial direction. The spacer 15 is formed between the front opening end surface (the axially outer end surface) and the tapered surface 14. The inner and outer diameters of the spacer 15 are formed substantially the same as the inner and outer diameters of the guide ring concealing cylinder 5.

  In providing the retaining ring receiving recess 13 on the inner periphery of the retaining ring holding cylinder 7, by adopting means for fitting a spacer 15, which is separate from the retaining ring retaining cylinder 7, into the retaining ring retaining cylinder 7. The retaining ring holding cylinder 7 can be easily formed with a simple molding die structure, and the retaining ring 11 is inserted before the spacer 15 is fitted from the rear opening end of the retaining ring retaining cylinder 7. 7 can be easily assembled from the rear opening end.

  The retaining ring 11 is made of a wire material such as stainless steel, and a biting tooth 11 a that bites into the outer peripheral surface of the connecting pipe P inserted into the connecting pipe receiving port 9 is provided on the inner diameter portion of the retaining ring 11. A part of the circumference of 11 is cut off, and the entire retaining ring 11 is formed to be capable of expanding and contracting in diameter.

  The retaining ring holding cylinder 7 is preliminarily assembled with the retaining ring 11 and the spacer 15 and then screwed into the male thread 6 of the joint body 1. At this time, the front end surface of the guide ring concealing cylinder 5 and the rear opening of the spacer 15 are connected. It is screwed and connected to the end face via an annular elastic member 12. The elastic member 12 includes an annular rubber plate as shown in FIG. 1 or a corrugated spring washer having some corrugations on an annular spring plate lacking a part of the circumference as shown in FIG. The inner and outer diameters of the elastic member 12 are set to be substantially the same as the inner and outer diameters of the spacer 15. By incorporating the elastic member 12 in this manner, the spacer 15 is always pressed and biased forward toward the tapered surface 14, and the retaining ring 11 is pressed against the tapered surface 14 at the front opening end surface of the spacer 15.

One or a plurality of seal ring grooves 16 are provided on the outer periphery of the guide tube 3 near the front opening end (close to the axially outer end), and the seal ring groove 16 has a larger diameter than the outer diameter of the connecting pipe P. An elastic seal ring 17 made of an O-ring or the like that is small and has an outer diameter larger than the inner diameter and is in close contact with the inner peripheral surface of the connecting pipe P is fitted. In this case, in order to improve the sealing performance, in the illustrated example, the seal ring groove 16 is formed by arranging two first seal ring grooves 16a and second seal ring grooves 16b at predetermined intervals in the axial direction, and inward in the axial direction. The first elastic seal ring 17a is fitted in the first seal ring groove 16a on the side, and the second elastic seal ring 17b is fitted in the second seal ring groove 16b on the axially outer side.
The first and second elastic seal rings 17a and 17b can be easily fitted into the first and second seal ring grooves 16a and 16b before the retaining ring holding cylinder 7 is coupled to the joint body 1. After the elastic seal rings 17a and 17b are fitted, the retaining ring holding cylinder 7 in which the retaining ring 11 and the spacer 15 are incorporated in advance is screwed and coupled to the joint body 1 via the elastic member 12.

  The insertion guide ring 18 is a resin molded product such as nylon, and is colored differently from the color of the outer surface of the connection pipe P so that it can be clearly distinguished from the connection pipe P. For example, when the color of the connection pipe P is white, the insertion guide ring 18 is blue, red, or green. The inner diameter portion of the insertion guide ring 18 has a rearwardly expanding taper 18a that gradually expands from the front end portion toward the rear, and the outer diameter portion from the rear end portion toward the front opposite to the inner diameter portion. The taper 18b of the front expansion shape which gradually expands is formed, and the elastic protrusion 18c which can slide with respect to the inner surface of the spacer 15 is provided in the outer periphery which attached the taper 18b. The insertion guide ring 18 is made of fluorescent or phosphorescent material, such as by applying a luminescent paint using a phosphor or phosphor, or by molding with a synthetic resin containing a luminescent pigment, so that the insertion can be easily confirmed even in a dark place. It can be formed to emit.

Next, a usage mode of the plug-in type pipe joint having the above configuration will be described. In the field construction, first, the resin connection pipe P is cut to a required length. As shown in FIG. 2, one end of the cut connection pipe P is inserted into the connection pipe receiving port 9, and the insertion guide ring 18 is pushed from the front of the connection pipe P at one end of the connection pipe P to be connected. It is pushed inwardly of the tube receiving port 9. The insertion guide ring 18 to be pushed is pushed open by the taper 18b of the outer diameter portion to expand the diameter, and the taper 18a of the inner diameter portion extends from the first and second seal ring grooves 16a and 16b of the guide tube 3. The first and second elastic seal rings 17a and 17b projecting from each other are compressed and passed through the first and second seal ring grooves 16a and 16b. The retaining ring 11 is slightly moved by pushing the spacer 15 in the insertion direction of the connecting pipe P due to the diameter expansion, but this movement is allowed by the compression of the elastic member 12.
Thus, the taper 18a of the insertion guide ring 18 abuts on the outer periphery of the first and second elastic seal rings 17a and 17b protruding from the first and second seal ring grooves 16a and 16b, and compresses the rings 17a and 17b. By passing through the seal ring grooves 16a and 16b while being pushed in, the connection pipe P can be smooth without sticking to the elastic seal rings 17a and 17b even if the inner circumference of one end of the connection pipe P is not chamfered in advance. Can be inserted into.

  Whether or not the connecting pipe P normally pushes the insertion guide ring 18 and whether or not the insertion guide ring 18 and the connecting pipe P normally pass through the retaining ring 11 are determined by holding the retaining ring. Since the tube 7 is transparent or translucent, and the insertion guide ring 18 is given a color different from that of the connection pipe P and can be easily distinguished from the connection pipe P, it can be easily visually confirmed from the outside. Therefore, for example, there is a problem that the connecting pipe P is erroneously inserted obliquely and the insertion guide ring 18 is not normally pushed, or the insertion guide ring 18 does not normally pass through the retaining ring 11. If it occurs, this can be discovered very quickly, so that the insertion of the connecting pipe P can be immediately stopped and reinserted.

  Even when the insertion is temporarily stopped and a pulling force is applied to the connection pipe P during the insertion of the connection pipe P, the annular elastic member 12 interposed between the rear opening end face of the spacer 15 and the joint body 1 side is always used. Since the retaining ring 11 is pressed against and urged against the tapered surface 14 via the spacer 15 so that there is no play S as shown in FIG. 7 between them, one end of the connecting pipe P and the insertion guide There is no gap G between the ring 18 as shown in FIG. Accordingly, the connection pipe P can be continuously inserted even after the insertion of the connection pipe P is once stopped.

  At this time, if an elastic protrusion 18 c is provided on the outer periphery of the insertion guide ring 11, the insertion guide ring 18 contacts the elastic protrusion 18 c and the inner surface of the spacer 15 even if the insertion is temporarily stopped during the insertion of the connecting pipe P. The friction force generated between the surfaces securely stops and holds the spacer 15. Therefore, when the insertion of the connection pipe P is temporarily stopped during the insertion of the connection pipe P, the insertion guide ring 18 does not move freely in the insertion direction of the connection pipe P within the spacer 15. Further, when the insertion of the connecting pipe P is stopped halfway and a pulling force is applied to the connecting pipe P, the retaining ring 11 is slightly moved in the pulling direction of the connecting pipe P while strongly abutting the tapered surface 14 and reducing the diameter. However, even when the retaining ring 11 is slightly moved in the pulling direction of the connecting pipe P in this way, the insertion guide ring 18 is connected together with the spacer 15 that is pushed and moved in the pulling direction of the connecting pipe P by the elastic force of the elastic member 12. The pipe P is moved in the same direction as the drawing direction. Therefore, the insertion guide ring 18 and the one end of the connection pipe P are not separated from each other, and the contact state between them can be maintained. It is advantageous in continuing to insert the connecting pipe P after the stop.

As shown in FIG. 3, when one end of the connection pipe P is completely inserted into the connection pipe receiving port 9, the first and second elastic seal rings 17 a and 17 b are compressed on the inner peripheral surface of the connection pipe P. A state is obtained in which the inner peripheral surface of the connection pipe P and the outer peripheral surface of the guide tube 3 are sealed in close contact with each other, and the biting teeth 11a of the retaining ring 11 bite into and engage with the outer peripheral surface of the connection pipe P. Thus, the connection pipe P can be prevented from being pulled out.
When one end of the connection pipe P is completely inserted into the connection pipe receptacle 9 as shown in FIG. 3, the insertion guide ring 18 enters the insertion guide ring entry space 4 in the opaque guide ring concealing cylinder 5. Until it is covered with the guide ring concealing cylinder 5 and cannot be seen from the outside. If the insertion is insufficient, the insertion guide ring 18 does not enter the insertion guide ring entry space 4 and goes out of the guide ring concealing cylinder 5. Therefore, it can be easily confirmed whether or not one end portion of the connection pipe P is completely inserted to the back of the connection pipe receiving port 9. Accordingly, it is possible to prevent poor insertion or insufficient insertion of the connecting pipe P that causes water leakage.

  After the connection pipe P is inserted, when the connection pipe P is pulled in the pulling direction, the outer peripheral surface of the retaining ring 11 that has already eaten into the outer peripheral surface of the connection pipe P and accompanies the connection pipe P is held by the outer retaining ring. By coming into contact with the tapered surface 14 of the cylinder 7, the retaining ring 11 is reduced in diameter, and the biting of the biting teeth 11 a on the outer peripheral surface of the connecting pipe P is increased. By increasing the biting of the retaining ring 11 into the outer peripheral surface of the connection pipe P in this way, the connection pipe P can be reliably prevented from coming out from the connection pipe receiving port 9.

  When it is necessary to remove the connection pipe P from the joint body 1 from the plugged connection state of the connection pipe P, the retaining ring holding cylinder 7 is loosened from the male thread 6 of the joint body 1 and the retaining ring holding cylinder is loosened. The connecting pipe P can be removed from the joint body 1 by removing 7 from the joint body 1.

  In the above embodiment, the elastic member 12 is interposed between the rear opening end surface of the spacer 15 and the joint body 1 side, and the retaining ring 11 is always indirectly pressed against the tapered surface 14 via the spacer 15. Instead of this, as shown in FIG. 5, the elastic member 12 is interposed between the front opening end face of the spacer 15 and the retaining ring 11 so as to always press the retaining ring 11 against the tapered surface 14. There may be.

  Further, in the above embodiment, the retaining ring holding cylinder 7 and the spacer 15 are formed to be transparent or translucent so that the situation during the insertion of the connecting pipe P and the state after the insertion can be easily visually confirmed from the outside. In addition, the insertion guide ring entry space 4 is formed between the outer periphery of the guide tube 3 and the inner periphery of the guide ring concealing tube 5, but instead of this, the retaining ring holding tube 7 and the spacer 15 are opaque. Even if it exists, as shown in FIG. 6, the confirmation hole 20 can also be formed in the required location of the retaining ring holding | maintenance cylinder 7 so that the state in the middle of the insertion of the connection pipe P and the state after insertion can be seen from the outside. In this case, the guide ring concealing cylinder 5 is not necessarily required, and the elastic member 12 that presses and urges the spacer 15 together with the retaining ring 11 toward the tapered surface 14 is the rear opening end face of the spacer 15 and the joint body. You may interpose between 1 front end surfaces.

  The present invention can be similarly applied to the case where the joint body 1 is an elbow or a T type other than the socket type shown in the drawing.

  Even if you try to pull out the connecting pipe during insertion, there is no gap between the pipe end and the insertion guide ring. Therefore, it is possible to continue the insertion again, and it is easy to handle. Suitable for plug-in fittings such as hot water and water supply pipes. Used for.

It is a half notched cross-sectional view showing the plug-in type pipe joint of one embodiment in a state before inserting the connecting pipe. FIG. 2 is a half-broken cross-sectional view showing the plug-in type pipe joint of FIG. FIG. 2 is a half-cut cross-sectional view showing the plug-in type pipe joint of FIG. 1 in a state after insertion of a connecting pipe. It is a perspective view which shows the modification of an elastic member. FIG. 4 is a half-cut cross-sectional view showing another embodiment corresponding to FIG. 3. FIG. 7 is a half-cut cross-sectional view corresponding to FIG. 1 showing still another embodiment. It is a half notched cross-sectional view showing the plug-in type pipe joint of the comparative example in a state before inserting the connecting pipe. FIG. 8 is a half-broken cross-sectional view showing the plug-in type pipe joint of FIG. 7 in a state where the connecting pipe is being inserted. FIG. 8 is a half-broken cross-sectional view showing a troubled state during insertion of the connecting pipe of the plug-in type pipe joint of FIG. 7.

Explanation of symbols

P Connection pipe 1 Joint body 3 Guide tube 7 Retaining ring holding tube 9 Connection tube receiving port 11 Retaining ring 12 Elastic member 13 Retaining ring housing recess 14 Tapered surface 15 Spacer 16 Seal ring groove 16a First seal ring groove 16b First 2 seal ring groove 17 elastic seal ring 17a first elastic seal ring 17b second elastic seal ring 18 insertion guide ring 18c elastic protrusion

Claims (7)

The joint body is equipped with an elastic seal ring, retaining ring, insertion guide ring, retaining ring holding cylinder, and spacer.
The joint body has a guide tube projecting outwardly from one end portion of the joint main body, and a retaining ring holding tube that covers the outer periphery of the guide tube through a connection tube receiving port that receives one end portion of the connection tube. The end is screwed and joined to the outer periphery of one end of the joint body,
A taper that applies a diameter reducing action to the retaining ring by abutting the retaining ring having an inner diameter portion that bites into and engages with the outer peripheral surface of the connecting pipe on the inner periphery of the retaining ring holding cylinder on the front opening end side. The surface is formed in a narrowed shape toward the front opening end of the retaining ring holding cylinder,
A retaining ring housing recess in which the retaining ring is housed inside the retaining ring retaining cylinder is forward of the cylindrical spacer in which the retaining ring retaining cylinder is fitted in the retaining ring retaining cylinder so as to be movable in the axial direction. It is formed between the opening end surface and the tapered surface,
A seal ring groove is provided on the outer periphery of the guide tube, and the elastic seal ring that is in close contact with the inner peripheral surface of the connection pipe is fitted into the seal ring groove,
The insertion guide ring is incorporated in the connection tube receiving port so as to move toward the inner side of the connection tube receiving port while compressing the elastic seal ring as it is pushed at one end of the connection tube. For plug-in fittings,
An insertion-type pipe joint, wherein an annular elastic member that constantly presses and biases the retaining ring against the tapered surface is incorporated in the retaining ring holding cylinder.   The plug-in type pipe joint according to claim 1, wherein the elastic member is interposed between a rear opening end face of the spacer and the joint body side, and always presses the retaining ring against the tapered surface via the spacer. .   The plug-in type pipe joint according to claim 1, wherein the elastic member is interposed between a front opening end face of the spacer and the retaining ring and always presses the retaining ring against the tapered surface.   The plug-in type pipe joint according to any one of claims 1 to 3, wherein the elastic member is formed of an annular rubber plate.   The plug-in type pipe joint according to any one of claims 1 to 3, wherein the elastic member comprises a wave spring washer.   The seal ring groove includes a first seal ring groove and a second seal ring groove arranged at a predetermined interval in the axial direction of the outer periphery of the guide cylinder. The plug-in type pipe joint according to any one of claims 1 to 5, wherein an elastic seal ring is fitted. The plug-in type pipe joint according to any one of claims 1 to 6, wherein an elastic protrusion that is slidable with respect to the inner surface of the spacer is provided on an outer periphery of the insertion guide ring.

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