JP2001227688A - Bayonet pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bayonet pipe joint capable of being connected by surely centering a connection tube inserted into a joint body, and having the function of holding the connection tube. SOLUTION: This bayonet pipe joint has a tube butting part 13 for butting an end of the tube to an inner depth part of joint body, a cylindrical guide part 12 having a length to support an outer peripheral surface of the tube, and a packing mount part 14 at an end side, and plural lips 21 and lip packings 20 respectively located at an edge of each lip, and provided with a guide peripheral face 22 larger than an inner diameter of an opening at an end of the packing mount part, and an annular projection part 23 axially projecting, are mounted in the packing mount part. An outer peripheral face of each lip packing is provided with circumferential annular projection 24. A locking ring 30 kept into contact with the annular projection part 23 of the lip packing and a folded inner surface at the end of the packing mount part, is mounted in the packing mount part of the main body. A threaded hole is formed on the packing mount part, a bolt is engaged with the threaded hole, and the holding ring is pressed to an outer surface of the connection tube.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint for connecting a connecting pipe by inserting the connecting pipe into a joint body. For example, the present invention relates to a plug-in pipe suitable for vertical pipes used for rainwater drainage pipes of buildings. It relates to a joint.

[0002]

2. Description of the Related Art As shown in FIG. 5, Japanese Patent Publication No. 7-35872 discloses a socket structure of a joint in which a water pipe is vertically piped substantially vertically. In this connection, a connecting member is provided at the opening-side front end portion of the receiving portion with a sealing member having a tongue piece whose diameter is gradually reduced as the inner peripheral surface goes from the front end portion to the inner rear portion. A fitting part of a pipe fitting to be inserted and fitted, and gradually bent inward in an arc shape as the inner peripheral surface of the tip part whose diameter is expanded so as to interpose a sealing member becomes the tip part. This is a fitting structure of a pipe joint having a curved surface.

[0003]

According to this method, the seal is reliably carried out by the tongue of the seal member abutting against the outer peripheral surface of the inserted tube. Since the connection pipe inserted into the mouth has no place to support it centered with the joint body, the connection pipe inserted with respect to the axis of the joint body cannot be centered. Therefore, it can be easily bent in the bending direction of the pipe in the receiving port, and is unstable unless the joint body and the connection pipe are separately centered after the connection to the joint body to support and fix the pipe and the joint. . For this reason, the number of support points has increased and piping work has been difficult. Also, at the time of insertion and connection of the connecting pipe, the end of the connecting pipe abuts against the inner surface of the inlet of the seal member mounted on the joint body, so that the tongue of the seal member is easily damaged by the end of the pipe, and the tongue seals. However, there was a problem that the sealability was impaired due to scratching. The present invention is to provide a pipe joint that solves the above-mentioned problems, and the centering of a connection pipe inserted into a joint body is securely performed, supported and connected, and a seal of a seal packing when the connection pipe is connected. An object of the present invention is to provide a plug-in type pipe joint in which a portion is hardly damaged and which has good sealing properties.
Another object of the present invention is to provide a plug-in type pipe joint provided with a function of preventing the connection pipe from coming off so that the connection pipe inserted and connected to the joint main body is not easily detached from the joint main body.

[0004]

SUMMARY OF THE INVENTION The gist of the present invention is a pipe joint for connecting and connecting a connecting pipe from an end of a joint body, wherein the end of the pipe inserted into the inner part of the joint body abuts. It has a pipe abutting part, a cylindrical guide part having a length supporting the outer peripheral surface of the pipe, and a packing mounting part on an end side thereof, and the end of the packing mounting part has an opening inner diameter into which the pipe is inserted. A plurality of lips which are bent and gradually shrunk from the outer diameter of the connecting pipe as the inner peripheral surface becomes the inner part in the packing mounting portion, and the packing is mounted on the end side of the lip. A plug-in type pipe joint comprising a lip packing having a guide surface having an inner diameter larger than an inner diameter of an opening at a part end and having an annular projection projecting in an axial direction.

[0005] In the above, the outer peripheral surface of the lip packing is provided with a ridge that protrudes annularly in the circumferential direction. In the above, the bent portion at the end of the packing mounting portion is provided on a tapered inner surface that gradually decreases in diameter toward the end side, and a contact is made between the annular projecting portion of the lip packing and the tapered inner surface of the end of the packing mounting portion. A plug-in type pipe fitting characterized by attaching a retaining ring. In the above, a screw hole is provided in the packing mounting portion of the joint body so as to press against the outer surface of the retaining ring mounted on the packing mounting portion, and a bolt is screwed into the screw hole to attach the retaining ring to the outer surface of the connection pipe. The plug-in type pipe joint is characterized in that the pipe joint is pressed. In the above, the outer peripheral surface of the lip packing may be provided with a tapered outer peripheral surface that comes into contact with the tapered inner peripheral surface of the joint body.

[0006]

According to the present invention, the joint main body for receiving the connecting pipe is provided with a cylindrical guide portion having a length for supporting the outer peripheral surface of the pipe. In addition, the packing mounting portion of the joint body has a guide surface having an inner diameter larger than the inner diameter of the opening at the end of the packing mounting portion on the end side, and gradually becomes outside the connection pipe as the inner peripheral surface becomes deeper. A lip packing that has a plurality of lips that extend beyond the diameter is attached. For this reason,
With the tubular guide portion of the joint body and the portion compressed by the lip on the end side, the outer peripheral surface of the inserted connection pipe is supported, and in a state where it is centered and supported so as to match the axis of the joint body. The connection is made. Therefore, there is no possibility that the connection pipe is easily bent with respect to the joint main body, and the pipe is centered securely and sealed. In addition, the lip packing has a guide surface with an inner diameter larger than the inner diameter of the end opening of the main body packing mounting part on the end side, and has an annular protrusion that projects in the axial direction, so when connecting the pipe into the joint body, Since the connecting pipe first hits the bent opening at the end of the packing mounting portion of the main body, it is necessary to insert the pipe so that the axis of the pipe is aligned with the axis of the main body, so that the packing directly hits the pipe end and is damaged. Is prevented. That is, in the conventional joint, the pipe end directly hits the packing and the packing is easily scratched regardless of the insertion direction of the fitting and the pipe at any angle, but in the present invention, the connecting pipe is first inserted into the opening of the main body packing mounting portion. Then, the pipe is inserted with the axis of the joint body and the joint body being adjusted to some extent, and then abuts against the inner surface of the lip of the packing, so that the joint body and the pipe are inserted into the packing in a substantially concentric state. For this reason, the phenomenon that the lip on the inner surface of the packing is damaged is greatly reduced.

Further, by providing a ridge that protrudes in the circumferential direction annularly on the outer peripheral surface of the lip packing, the inner peripheral surface of the packing mounting portion and the ridge are compressed, so that the degree of adhesion is improved and the sealing performance is improved. I do. In addition, the bent end portion of the joint body is formed into a tapered inner surface, and the end portion of the packing is provided with an annular protrusion that abuts the tapered inner surface, so that when the connecting pipe is pulled out, the lip packing is further reduced at the tapered inner surface. Since it acts in the radial direction, it is tightly sealed to the connecting pipe, and the outer peripheral surface of the connecting pipe is held by the lip packing to exert a pull-out preventing force. In this case, the outer peripheral surface of the annular protruding portion can be formed into a tapered surface that abuts against the inner surface of the tapered portion, so that the pipe can be held more strongly. By installing a retaining ring that comes into contact with the tapered inner surface of the end of the main body packing mounting part together with the lip packing in the packing mounting part of the joint body, when the pull-out force acts on the pipe, the diameter of the retaining ring is reduced by the tapered inner surface, Since the outer peripheral surface of the tube is locked, it is possible to reliably prevent the tube from being pulled out. Also, a screw hole is provided in the packing mounting part so that the outer peripheral surface of the retaining ring is pressed, the bolt can be screwed together and the bolt can be tightened after connection. It is possible to reliably work out the pull-out preventing force of the connecting pipe, in combination with the biting into the surface and the diameter reduction effect of the tapered surface of the joint body.

[0008]

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 of a plug-in type pipe joint showing a first embodiment of the present invention. In this embodiment, in order to manufacture the joint body 10, a steel pipe is formed by plastic working such as bulging or drawing. The central part 11 of the main body has the original outer diameter of the steel pipe, and a cylindrical guide part 12 of a predetermined length for supporting and guiding the outer peripheral surface of the connection pipe is provided on both ends thereof with an increased diameter. Therefore, although the cylindrical guide portion 12 depends on the diameter of the pipe 1 to be connected, in this embodiment, the length is about 15 to 30 mm, and the inner diameter is provided substantially at the outer diameter of the connecting pipe. And are supported in the same axial direction. The inserted tube 1 comes into contact with a tube abutting portion 13 formed at a step between the central portion 11 and the inner end of the cylindrical guide portion 12, and the insertion amount of the tube 1 into the joint body 10 is determined. You.

On the end side of the cylindrical guide portion 12, a packing mounting portion 14 whose diameter is further increased by one step is provided. The end side forming the packing mounting portion 14 is bent so as to have an opening inner diameter slightly larger than the outer diameter of the connection pipe 1, and the inner peripheral surface of the bent portion gradually decreases in diameter toward the tip. A lip packing 20 shown in FIG. 2 is mounted in the packing mounting portion 14 on the inner surface 15. The free state of the lip packing 20 is shown in FIG. 2, in which two annular ridges 24 are provided on the outer peripheral surface, and the inner surface side is gradually reduced in diameter from the entrance side to the inner side, and is attached to the shaft center side. The two inner lips 21 are provided, and the inner peripheral surfaces of both ends of the lips 21, 21 have a guide peripheral surface 22 having an inner diameter through which the connecting pipe 1 is inserted and having a diameter larger than the opening inner diameter of the end of the packing mounting portion of the main body. An annular projecting portion 23 which is provided on the end side and projects toward the end side in the axial direction and abuts against the bent tapered inner surface 15 of the end of the main body.
Is provided. The end of the annular protrusion 23 is in contact with the bent inner surface 15 of the end, and the outer surface of the protrusion is provided on the tapered surface as shown in FIG. 1 or on the step as shown in FIG. The guide peripheral surface 22 of the annular protruding portion 23 is larger than the inner diameter of the opening of the packing mounting portion 14, and the lip 21 projects so as to abut the outer peripheral surface of the pipe with a sufficient margin. It is possible to increase the contact pressure on the pipe and to reduce the compressive deformation rate, thereby improving the sealing performance and the packing life.

The tip diameter of the lip 21 is smaller than the outer diameter of the connecting pipe 1, and as shown in FIG.
1 is bent and abuts against the tube and is compressed to seal the outer peripheral surface of the tube 1. In particular, the guide peripheral surface 22 of the annular projecting portion 23 is larger than the inner diameter of the opening of the main body inlet, and the connecting tube 1 is smoothly guided and inserted by the opening and the guide peripheral surface 22 of the packing to abut the lip 21. And inserted into the cylindrical guide portion 12. The lip 21 bent by the insertion of the tube 1 can be provided so as to abut on the guide peripheral surface 22 and be compressed. For this reason, the amount of compression of the packing 20 is reduced, and good sealing properties are maintained over a long period of time. Further, the annular ridge 24 on the outer peripheral surface is compressed and adheres to the inner peripheral surface of the packing mounting portion 14, and therefore, the annular ridge 24 of the packing is more strongly compressed than other portions, and the adhesion of the packing is improved. And the sealing performance with the joint body is improved. The tube 1 inserted into the body abuts against the tube abutting portion 13 and the insertion amount of the tube is determined.

FIG. 4 is a longitudinal sectional view showing a second embodiment of the present invention. In this embodiment, a retaining ring 30 is mounted together with the lip packing 20 in the packing mounting portion 14 of the first embodiment. A retaining ring 30 is mounted between the rear end side of the annular projecting portion 23 of the lip packing and the bent portion tapered inner surface 15 of the main body packing mounting portion. Retaining ring 3
The outer surface 0 has a tapered outer surface 31 that abuts against the tapered inner surface 15, and has a saw-toothed biting tooth 32 whose inner peripheral surface is locked to the outer peripheral surface of the connection pipe 1. When a pulling force acts on the tube 1 inserted into the main body, the retaining ring is moved to the tapered inner surface 15.
In order to be able to reduce the diameter, a part of the circumference of the retaining ring is provided with a cut, so that the diameter can be freely increased and decreased.

Further, a screw hole 16 is formed in the bent portion of the end of the packing mounting portion 14, and a bolt 17 is screwed to press the tapered outer surface of the retaining ring 30.
The screw hole 16 and the bolt 17 may be provided at one location on the circumference of the packing mounting portion 14 or at multiple locations. By providing the bolt 17 for further pressing the retaining ring 30 in this way, the retaining ring 30 bites into the outer peripheral surface of the tube 1 reliably, and the tube 1 is reliably prevented from being pulled out, so that connection can be made.

[0013]

As described above, the plug-in type pipe joint of the present invention is
The connection is performed in a state where the outer peripheral surface of the inserted connection pipe is supported and centered and supported so as to match the axis of the joint main body.
Therefore, there is no possibility that the connection pipe is easily bent with respect to the joint body, and the pipe is centered securely and connected with good sealability. Moreover, the phenomenon that the packing is damaged at the end of the connecting pipe inserted into the main body is reduced, and good sealing performance is secured. Further, it is possible to reliably prevent the connection pipe from being pulled out. In addition, a lip packing having both a sealing property and a sealing life can be obtained, so that a plug-in type pipe joint which has good long-term sealing property and is suitable for building piping or the like can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a plug-in type pipe joint showing a first embodiment of the present invention.

FIG. 2 is a partial sectional view showing a free state of a lip packing.

FIG. 3 is an enlarged cross-sectional view showing a connection portion with the pipe of FIG. 1;

FIG. 4 is a longitudinal sectional view of a plug-in type pipe joint showing a second embodiment of the present invention.

FIG. 5 is a diagram showing a conventional joint structure of a pipe joint receiving portion.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Joint main body 11 Main body center part 12 Cylindrical guide part 13 Tube abutting part 14 Packing mounting part 15 Tapered inner surface of the bent part at the end opening 16 Screw hole 17 Bolt 20 Lip packing 21 Lip 22 Guide peripheral surface 23 Annular protrusion 24 Annular Ridge 30 retaining ring 31 tapered outer surface of retaining ring 32 biting teeth of retaining ring

Claims (4)

[Claims] 1. A pipe joint for connecting a connecting pipe by inserting the connecting pipe from an end of a joint body, wherein a pipe abutting portion against which an end of the pipe inserted into an inner part of the joint body abuts and an outer peripheral surface of the pipe. It has a cylindrical guide part of a supporting length and a packing mounting part on its end side, and the end of the packing mounting part is bent with an opening inner diameter into which a pipe is inserted, and inside the packing mounting part A plurality of lips which are gradually reduced in diameter from the outer diameter of the connection pipe as the inner peripheral surface becomes the inner depth, and which have an inner diameter larger than the inner diameter of the opening of the end of the packing mounting portion at the end of the lip. A plug-in type pipe fitting characterized by being equipped with a lip packing having a guide surface and having an annular protrusion protruding in the axial direction. 2. The plug-in type pipe joint according to claim 1, wherein the outer peripheral surface of the lip packing is provided with a ridge projecting annularly in a circumferential direction. 3. A bent portion at an end of the packing mounting portion is provided on a tapered inner surface whose diameter gradually decreases toward the end,
The plug-in type pipe joint according to claim 1, further comprising a retaining ring that comes into contact with an annular protrusion of the lip packing and a tapered inner surface of an end of the packing mounting portion. 4. A screw hole is provided in the packing mounting portion of the joint body so as to press the outer surface of the retaining ring mounted on the packing mounting portion, and a bolt is screwed into the screw hole to connect the retaining ring. 4. The plug-in type pipe joint according to claim 1, wherein the pipe joint is pressed against an outer surface of the pipe joint.