JP2002243077A - Insert type pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insert type pipe joint capable of surely confirming insertion of a pipe into a joint main body by preventing lowering of flow resistance of a fluid flowing through the joint main body, confirming insertion of a connecting pipe into the joint main body, easily inserting the connecting pipe into the joint main body, and not stopping the pipe before the pipe is inserted in the joint main body by a designated amount. SOLUTION: In this insert type pipe joint, a packing is mounted to seal a pipe by inserting the end part of the pipe to be connected in a connecting port of the joint main body. The front end part of the packing is provided with a pipe end locking part locked on the inserted pipe end to move the packing into the connecting port, and the rear end part of the packing is provided with a holding ring locking part locked on the holding ring to move the holding ring into the connecting port of the main body. The connecting port of the joint main body has a seal inner surface for sealing a gap with the pipe outer surface by movement of the packing due to insertion of the pipe. The holding ring is moved into the connecting port by insertion of the pipe, thereby locking the outer peripheral surface of the pipe and locking it in a gap up to the inner surface of the connecting port.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plug-in type pipe joint which can be connected only by inserting a pipe end into a connection port of a joint body when connecting with a connection pipe.

[0002]

2. Description of the Related Art Conventionally, for example, in Japanese Unexamined Patent Publication No. 2-240492, as shown in FIG. 7, tapered inner peripheral surfaces O and P which gradually decrease in diameter toward the opening end side are formed on a receiving inner surface of a joint body S. The tapered inner peripheral surface is provided with a stopper Q that is partially cut off in the circumferential direction. When the connecting pipe R is about to come off, the taper inner peripheral surfaces O and P reduce the diameter of the stopper Q and connect. There is a pipe joint that bites into the outer peripheral surface of the pipe R and prevents the connection pipe R from coming out of the joint body S.

Further, the applicant of the present invention disclosed in Japanese Patent Application Laid-Open No. 07-035
In FIG. 281, as shown in FIG. 8, an O-ring 6 is attached to an outer surface of a cylindrical projection 5 supporting an inner surface of a connecting pipe so as to seal with the pipe. The end 92 of the groove expanding member 7 is locked in the split groove 4 so that the width of the split groove is expanded, and when the connecting pipe 2 is inserted by a predetermined amount, the contact portion 93 of the groove expanding member 7 is The end portion 95 of the groove expanding member 7 is released from the engagement with the split groove 4 of the stopper 3 because the end portion 95 is pressed and moved to the inner depth by the end portion.
There is a pipe joint which rises up to the window 8 of the joint body to check whether the pipe 2 has been inserted into the joint body by a predetermined amount.

[0004]

In the above-mentioned prior art plug-in type pipe joint, the fitting of the joint is usually set to have the same or slightly smaller diameter as the outer diameter of the pipe R connecting the inner diameter of the stopper Q. It is loosely fitted on the inner surface T, and at the same time as the tube R is inserted, the outer surface of the tube R is reduced in diameter by the elastic force of the stopper Q itself, so that the tube R and the stopper Q are integrated when the tube R is pulled out. Retreat,
The stopper Q is reduced in diameter at the tapered inner peripheral surfaces O and P of the main body so that the stopper Q is cut into the pipe R.

[0005] Therefore, if the end of the connecting pipe R to be inserted into the joint main body S is not provided with a chamfer U, it cannot be smoothly inserted, so that the workability is poor. May not be able to insert any more. Further, in the case of a pipe made of a soft material such as a resin pipe, when the tip of the pipe R hits the stopper Q, the pipe itself bends and cannot be inserted any more.
In some cases, the inner surface may be scratched in the axial direction. Further, since the insertion state of the tube cannot be visually confirmed, a trouble such as disconnection of the tube after connection due to poor connection due to insufficient insertion of the tube easily occurs.

In the above-mentioned conventional plug-in type pipe joint, when the pipe 2 is inserted by a predetermined amount, the indicator 95 of the groove expanding member 7 is inserted.
Rises in the window 8 of the joint body, and the insertion of the pipe 2 into the joint body is confirmed. However, since the window 8 is provided, the O-ring packing 6 must be provided on the outer surface of the cylindrical projection 5 supporting the inner surface of the tube, so that the inner surface of the tube 2 must be securely sealed.

However, the inner diameter of the pipe has a greater variation than the outer diameter. Therefore, in order to seal with the inner diameter of the pipe, it is necessary to mount a packing having a large cross-sectional area on the outer surface of the cylindrical projection 5. In order to use the packing 6 having a large cross-sectional area, the thickness of the cylindrical projection 5 must be increased. When the thickness of the cylindrical projection 5 is increased, the cylindrical projection 5 The inner diameter of the fluid 5 is considerably small, and the flow resistance of the fluid flowing in the cylindrical protrusion 5, that is, the inside of the joint body is increased, which is not good.

The present invention solves the above-mentioned problems, and makes it possible to confirm the insertion of the connecting pipe into the joint body without preventing the flow resistance of the fluid flowing through the joint body from decreasing. Insertion that makes it easy to insert the pipe into the fitting body, and prevents the pipe from falling off unless the pipe is inserted into the fitting body by a predetermined amount, so that the pipe can be securely inserted into the fitting body. The present invention provides a pipe joint.

[0009]

SUMMARY OF THE INVENTION The gist of the present invention is to provide a plug-in type pipe joint in which a packing for sealing the pipe is inserted into a connection port of the joint body by inserting an end of the pipe to be connected. At the front end of the packing, there is a locking part with the inserted pipe end, and at the rear end of the packing, there is a locking part with the retaining ring. A plug-in type pipe joint characterized in that it has a seal inner surface for sealing between the outer surface of the pipe and the outer surface of the pipe by the movement of the packing due to the above.

In the above, the retaining ring is moved into the connection port by inserting the pipe, and locks the outer peripheral surface of the pipe and locks between the inner surface of the connection port. It is. In the above, the locking means between the holding ring and the inner surface of the connection port is provided with a locking fitting portion on the inner surface of the connection port, a locking projection on the outer surface of the holding wheel, and engaging with the locking fitting portion. A plug-in type pipe joint characterized in that a stop projection is locked.

In the above, the locking means between the retaining ring and the inner surface of the connection port is provided with a serrated uneven fitting portion on the inner surface of the connection port, and with a locking projection protruding on the outer surface of the holding ring, Are plugged into the serration-shaped uneven fitting portion. In the above, there is provided a plug-in type pipe joint in which an inner surface of the holding ring is provided with a retaining member for locking the outer peripheral surface of the inserted tube. In the above, there is provided a plug-in type pipe joint, wherein the retaining ring is provided with a retaining ring which is retained on an outer peripheral surface of the inserted pipe and is retained on an inner surface of the connection port.

[0012]

According to the present invention, when a pipe is inserted into the connection port, the packing is locked at the end of the pipe and pushed into the connection port, and the packing moves to the seal inner surface in the connection port. The packing is compressed on the inner surface of the seal to seal the pipe. In addition, the rear end of the packing has a locking part with the retaining ring that moves the retaining ring into the connection port, so the retaining ring is drawn to the packing and automatically moves into the connection port, Locking with the tube is performed. Therefore, by inserting the pipe into the joint main body connection port, the retaining ring is moved into the joint main body, the rear end of the retaining ring is hidden in the main body and can not be seen from the outside, and it is determined whether the pipe is properly inserted and connected. Can be confirmed.

[0013] In addition, this regular insertion of the pipe,
In a state where the retaining ring is moved into the connection port, the retaining ring is locked on the inner surface of the connection port, and the retaining ring is locked on the outer peripheral surface of the pipe,
Prevents pipes from coming off and prevents them from coming off. The retaining means between the retaining ring and the inner surface of the connection port is provided with a locking fitting on the inner surface of the connection port, a locking projection on the outer surface of the retaining ring, and a locking projection on the locking fitting portion. Can be provided to be locked. Therefore, the pipe can be securely inserted, and the construction after the connection can be surely confirmed, so that poor connection due to insufficient insertion does not occur.

The retaining means between the retaining ring and the inner surface of the connection port is provided with a serration-shaped concave / convex fitting portion on the inner surface of the connection port, and a retaining projection extending over the outer surface of the retaining ring. It can be provided so as to be engaged with the concave-convex fitting portion. An inner surface of the retaining ring may be provided with a retaining member that is engaged with the outer peripheral surface of the inserted pipe. The retaining ring is engaged with the outer peripheral surface of the inserted pipe and engages with the inner surface of the connection port. A locking ring can be provided to stop the tube.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a longitudinal sectional view showing a first embodiment before a tube is inserted, and FIG. 2 is a longitudinal sectional view after a tube 41 is inserted. The plug-in type pipe joint includes a main body 10, a retaining ring 20, and a packing 30.
, A washer ring 40 and a stopper 50.
The main body 10 has a through hole 11 through which a fluid passes in the center, and a pipe 4.
1 and a cylindrical stiffener 13 extending toward the connection port 12 side
The tube 40 is inserted into the outer surface to support the inner peripheral surface of the tube. An outer surface of the stiffener 13 is a pipe mounting portion 14, a packing 30 is mounted on an outer peripheral side thereof, and a seal inner surface 15 for compressing the packing is compressed on an inner inner surface of the main body 10. The retaining ring 20 is mounted on the inner surface with the engagement fitting portion 16. The locking fitting part 16 is composed of an expandable and contractible ring 17 mounted in the concave groove,
It is expanded and contracted and locked by the locking projection 22 of the holding wheel 20. ,

The retaining ring 20 has a cylindrical shape mounted on the inner surface of the connection port 12 of the main body 10, has a tapered inner surface 21 on which the stopper 50 is mounted on the inner surface, and has a locking fit of the inner surface of the main body connection port 12 on the outer peripheral surface. It has a saw-toothed locking projection 22 that locks to the mating portion 16. One side of the locking projection 22 is inclined, and the connection port 1
2 goes to the back after passing through the locking fitting portion 16 on the inner surface, but once the locking projection 22 has passed, it is engaged with the ring member 17 which expands and contracts in the locking fitting portion so as not to be pulled out. The other side of the stop projection 22 is vertical. The front end of the holding wheel 20 is connected and locked to the packing 30. Accordingly, the retaining ring 20 is pulled by the movement of the packing 30, and the connection port 1 is moved.
2 It moves to the inner part. A washer ring 40 is interposed between the retaining ring 20 and the packing 30 to maintain the packing surface pressure.

The retaining member 50 is formed by integrally forming a retaining ring 51 and an annular resin 52, and the retaining ring 51 is stably mounted and held in the retaining wheel 20. The packing 30 has a locking portion 31 with the tube 41 at the front end, a lip-shaped seal portion 32 at the center, and a locking portion 33 with the retaining ring 20 at the rear end.

When the connecting pipe 41 is inserted as shown in FIG. 2, the end of the pipe is locked by the locking portion 31 of the packing, and the packing 30 is drawn to the seal inner surface 15 at the back of the connection port.
The packing 30 is compressed by the seal inner surface 15 to perform sealing. Further, the retaining ring 33 is provided at the locking portion 33 at the rear end of the packing.
0 is drawn into the connection port 12, the locking projection 22 of the holding ring 20 is fitted into the locking fitting portion 16 on the inner surface of the connection port, and the holding ring 20 is locked in the connection port. When the retaining ring 20 is fitted into the connection port of the joint main body and disappears from view, the connection operation of the pipe 41 is completed. When the tube 41 is pulled out after connection, the inner end of the retaining ring 51 of the stopper 50 is locked to the outer peripheral surface of the tube, and at the same time, the outer end of the retaining ring is connected to the inner surface 21 of the retaining ring 20. To lock. Further, since the retaining ring 20 is locked to the locking fitting portion 16 on the inner surface of the main body connection port 12, the retaining action of the pipe 41 works in the joint main body.

FIGS. 3 and 4 are sectional views showing a second embodiment of the present invention before and after insertion of a tube. The difference from the first embodiment is that the washer ring 40 between the packing 30 and the holding ring 20 is omitted, and the locking structure of the packing 30 and the holding ring 20 is connected and locked by using a saw-toothed locking portion. The rest is the same as in the first embodiment.

FIGS. 5 and 6 are sectional views showing a third embodiment of the present invention before and after insertion of a tube. In this embodiment,
Instead of the retaining device 50 of the first and second embodiments, the inner and outer diameter surfaces of the retaining ring 51 are provided so as to protrude from the inner and outer surfaces of the holder 20. A serrated locking groove 18 is provided on the inner surface of the connection port 12 so that the outer diameter end of the retaining ring 51 is locked. Therefore, in this case, the retaining projection 22 of the above embodiment can be omitted from the retaining ring 20, and the inclined inner surface 21 for holding the retaining member on the inner diameter side can be omitted. In addition, the locking ring 51 of the retaining ring is continuously locked by the serrated locking portion 18 on the inner surface of the connection port, so that the pipe 41 is more reliably prevented from coming off.

[0021]

As described above, with the plug-in type pipe joint of the present invention, the plugged-in state of the pipe can be reliably visually recognized, so that the connection work can be performed in a correct connection state. Further, even after the connection, it is possible to easily confirm whether or not the connection has been correctly performed. If the pipe 41 is not inserted correctly by a predetermined amount, the retaining ring 20 and the joint main body 10 are not locked, so that the packing 30
Is not compressed on the inner surface 15 of the seal, so that a leak occurs, and a connection failure can be confirmed by a leak inspection after the application. For this reason, poor connection and poor construction of the connection pipe can be reliably prevented. When the tube is inserted correctly, the initial bite engagement with the tube is securely performed, the retaining ring is locked to the main body, and the tube is securely prevented from being pulled out. In addition, pipes can be easily inserted into the fitting body and installed.
Further, since no packing is provided on the cylindrical member 13 of the joint main body that supports the inner peripheral surface of the pipe, the thickness of the stiffener can be formed with a minimum thickness in terms of strength, and the inner diameter of the stiffener 13 that forms the through-hole 11 can be increased. A plug joint having a low fluid flow resistance can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention before a tube is inserted.

FIG. 2 is a longitudinal sectional view showing a state after the pipe is inserted according to the first embodiment of the present invention.

FIG. 3 is a longitudinal sectional view showing a second embodiment of the present invention before a tube is inserted.

FIG. 4 is a longitudinal sectional view showing a state after insertion of a pipe according to a second embodiment of the present invention.

FIG. 5 is a longitudinal sectional view showing a third embodiment of the present invention before a tube is inserted.

FIG. 6 is a longitudinal sectional view showing a state after insertion of a pipe according to a third embodiment of the present invention.

FIG. 7 is a sectional view of a connecting portion of a bayonet joint showing a conventional technique.

FIG. 8 is a longitudinal sectional view showing another conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Joint main body 11 Through hole 12 Joint main body connection port 13 Main body stiffener 14 Pipe mounting part 15 Packing seal inner surface 16 Main body locking fitting part 17 Detachable expansion / contraction ring 18 Serrated locking groove of main body 20 Retaining ring 21 Inner surface of taper of retaining ring 22 Retaining projection of retaining ring 30 Packing 31 Retaining portion of packing with tube 32 Sealing portion of packing lip 33 Retaining portion of retaining ring with retaining ring 40 Washer ring 41 Connection pipe 50 Retainer Tool 51 retaining ring

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H015 BB03 BC01 BC08 GA02 KA00 3H019 JA01 3J106 AB01 BA01 BB01 BC04 BD01 BE12 BE13 BE25 BE29 EA03 EB02 EC01 EC07 ED12 EE02 EF03 EF04

Claims (7)

[Claims] 1. A plug-in type pipe fitting in which a packing for sealing a pipe is inserted by inserting a pipe end into a connection port of a fitting body, wherein the pipe end inserted into a front end of the packing. And a locking portion with a retaining ring at a rear end portion of the packing.In the connection port of the joint body, a seal is formed between the outer surface of the pipe and the pipe by inserting the pipe to move the packing. A plug-in type pipe joint characterized by having an inner surface of a sealing member. 2. The insertion state of the pipe is determined by moving the retaining ring into the connection port by inserting a pipe, and determining a predetermined state of the retaining ring at an end face of the connection port. The plug-in fitting described. 3. The holding ring is moved into the connection port by inserting a pipe, and locks the outer peripheral surface of the pipe and locks between the inner surface of the connection port. The plug-in type pipe joint described. 4. The locking means between the retaining ring and the inner surface of the connection port is provided with a locking fitting on the inner surface of the connection port, and a locking projection on the outer surface of the holding ring. The plug-in type pipe joint according to claim 1, wherein the locking projection is locked to the fitting. 5. The locking means between the retaining ring and the inner surface of the connection port is provided with a serration-shaped uneven fitting portion on the inner surface of the connection port, and with a locking projection protruding on the outer surface of the retaining ring. 5. The plug-in type pipe joint according to claim 1, wherein the plug engages with the serrated concave / convex fitting portion. 6. The plug-in type pipe joint according to claim 1, wherein a retaining member is provided on an inner surface of the retaining ring to lock the outer peripheral surface of the inserted tube. 7. The insertion ring according to claim 1, wherein the retaining ring is provided with a locking ring that locks on an outer peripheral surface of the inserted tube and locks on an inner surface of the connection port. Pipe fittings.