JP3959666B2 - Sleeve type fitting - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a pipe joint for connecting a plastic pipe or a thin metal tube, details about the sleeve-type pipe joint for connecting a pipe to compress the reduced-diameter member in the axial direction of the tube.
[0002]
[Prior art]
Conventionally, resin pipes such as polyethylene and polybutene have been used as fluid transport pipes such as gas pipes and water pipes, and there are various joints for connecting these resin pipes, and generally nuts are screwed into the joint body. In many cases, mechanical pipe joints that are connected by compressing a packing or a biting ring mounted between the joint body and the nut are used.
[0003]
[Problems to be solved by the invention]
In the above-described pipe joint, a pipe with a nut, packing, bite ring or the like mounted on the outer surface of the end of the connection pipe is inserted into the joint body, and the nut is screwed into the joint body and tightened to connect. For this reason, it is difficult to check the tightening of nuts, check the assembly of parts, and check the insertion of pipes, and the connection performance after construction is likely to vary, and the joints themselves are large and there are problems with workability such as tightening the nuts with a wrench. It was.
The purpose of the present invention is to eliminate the above-mentioned problems, and to provide a pipe joint that can be easily connected, there is no variation in connection strength, connection confirmation after construction is easy, and piping can be easily constructed with a small tool. It is to provide.
[0004]
[Means for Solving the Problems]
Aspect of the present invention, and the fitting body that have a core unit for supporting and inserted into the inner surface of the connecting tube, reduced-diameter member reduced in diameter the connection tube attached to the outer surface of the connecting tube extrapolated to the core portion The reduced-diameter member includes a sleeve portion that can be reduced in diameter , a thin-walled shear portion, and an axial surface that is sheared by the shear portion to compress the inner surface to the outer surface of the sleeve portion. Ri Do from an annular portion which each other stuck reducing the diameter of the sleeve portion, the inner diameter of the annular portion, is provided with a larger inner diameter than the small diameter side outer diameter of the tapered surface, further wherein the annular portion is more rigid than the sleeve portion The reduced-diameter member is made of synthetic resin, and the sleeve portion of the reduced-diameter member is provided with an engaging portion with the joint body, and the reduced-diameter member is engaged with the joint body. The sleeve is reduced in diameter by moving the annular part toward the joint body. This is a tube-type pipe joint.
[0005]
Further, consists of a joint body that have a core unit for supporting and inserted into the inner surface of the connecting pipe, the reduced-diameter member reduced in diameter the connection tube attached to the outer surface of the connecting tube extrapolated to the core portion, wherein the condensed diameter member includes a sleeve portion diameter capable provided, a shearing portion provided in the thin, each other inside surface and sheared by the shear portion by compressing axially is fitted on the outer surface of the sleeve part sleeve part Ri Do from an annular portion of reduced diameter of the inner diameter of the annular portion, is provided with a larger inner diameter than the small diameter side outer diameter of the tapered surface, the annular portion is thick cylinder rigid than the sleeve portion The diameter-reducing member is made of synthetic resin, the annular portion of the diameter-reducing member is provided with an engaging portion with the joint body, the diameter-reducing member is engaged with the joint body, and the sleeve portion is attached to the joint. in the sleeve-type pipe joint, characterized by reducing the diameter of the sleeve portion by moving the main body That.
[0006]
[Action]
The present invention has the above-described configuration, and there are only two members, ie, a joint main body and a reduced diameter member, and the sheared portion of the reduced diameter member is sheared by compressing the reduced diameter member in the axial direction after mounting the tube. Then, the annular part fits on the outer surface of the sleeve part, the sleeve part is compressed on the inner surface of the annular part to reduce the diameter, the outer surface of the connecting pipe is compressed on the inner surface of the sleeve part, and the connecting pipe is connected to the core of the joint body. It is clamped and connected. For this reason, it can connect using a comparatively simple tool, and since a sleeve part and an annular part are united, handling is easy.
At this time, if the reduced-diameter member is locked and integrated with the joint body, further assembly errors do not occur and handling is easy.
[0007]
By locking the reduced diameter member to the joint body, when a pulling force is applied to the connecting pipe, the core sandwiching the pipe and the reduced diameter member are locked together with the joint body so that it can be pulled out. Since the blocking force is high and the pipe joint is a single member, the handling workability is good.
To lock the joint body and the reduced diameter member, the sleeve portion of the reduced diameter member is provided with a locking portion and locked to the joint body. In this case, the annular portion is only a frictional force that fits on the outer surface of the sleeve portion. The diameter of the portion is reduced to reduce the outer surface of the tube.
In addition, the annular portion of the diameter-reducing member can be provided with a locking portion with the joint main body, and can be locked to the joint main body. In this case, the sleeve portion is pressure-inserted between the annular portion and the outer peripheral surface of the pipe. The outer peripheral surface is compressed and reduced in diameter.
[0008]
The sleeve portion is easily reduced in diameter when a part of the circumference is cut so that the diameter can be reduced. Further, since the connecting pipe can be confirmed from the outside through the slit portion of the sleeve portion when the connecting pipe is inserted into the joint body, the shortage of the pipe can be solved.
The reduced diameter member can be formed of a synthetic resin. In this case, the shearing portion can be formed into a shape that can be easily sheared, and the tube can be easily sheared from the shearing portion by compressing in the axial direction to compress the tube.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings. 1 to 3 show a first embodiment of the present invention, FIG. 1 shows a state before connection in a state where a connection pipe 30 is mounted, FIG. 2 shows a perspective view of a reduced diameter member, and FIG. It is a fragmentary sectional view showing a back state.
The pipe joint 10 includes a metal or resin joint body 11 and a reduced diameter member 20 formed of metal or resin. The joint body 11 has a cylindrical core 12 to be inserted into the inner surface of the connection pipe 30, and an uneven portion 13 having a sawtooth cross section is provided on the outer surface of the core 12. Further, a tube end abutting portion 14 against which the end of the connecting tube abuts is provided at the back of the core 12, and a locking concave groove 15 for connecting with the reduced diameter member 20 is provided at the back thereof.
[0010]
The diameter-reducing member 20 is substantially cylindrical as a whole, and has a sleeve portion 21 provided with a slit portion 27 so that the diameter can be reduced, a cylindrical annular portion 24, and the sleeve portion 21 and the annular portion 24. It consists of the shearing part 25 formed by. The end of the sleeve portion 21 is provided with a locking projection 23 that locks in the locking groove 15 of the joint body, and the diameter of the sleeve portion 21 is increased from the end of the joint body so that the locking projection 23 is attached to the body. Locked in the locking groove 15 . Further, a flange portion 22 is provided so as to protrude from the outer surface, and a pressure receiving outer surface 26 comprising a thick large diameter portion and a tapered surface is provided on the end side. The end portion of the tapered surface is formed integrally with the annular portion 24 via a thin shear portion 25. The inner diameter of the annular portion 24 is set to an inner diameter larger than the outer diameter on the small diameter side of the tapered surface, and is further provided in a thick cylindrical shape that is more rigid than the sleeve portion 21.
[0011]
By compressing the space between the annular portion 24 and the flange portion 22 formed on the outer surface of the sleeve portion in the axial direction, the shearing portion 25 is sheared so that the annular portion 24 rides on the pressure receiving outer surface 26 of the sleeve portion 21 and gradually increases in diameter. The sleeve portion 21 is reduced in diameter on the inner surface of the annular portion 24 by the tapered surface. The sleeve portion 21 is easily reduced in diameter because the slit portions 27 are provided at a plurality of locations on the circumference.
FIG. 3 shows a state where the sleeve portion and the annular portion are compressed in the axial direction to reduce the diameter of the tube 30 and the connection is completed. When the diameter of the sleeve portion 21 is reduced, the connecting tube 30 is strongly pressed against the outer peripheral surface of the core 12, and the inner surface of the tube 30 bites into the concavo-convex portion 13 on the outer surface of the core, thereby preventing sealing and pull-out.
[0012]
In this embodiment, since the reduced diameter member 20 is locked and assembled to the joint body 11, the operation of connecting the pipe is only to compress the reduced diameter member 20 in the axial direction after insertion into the joint. There are no assembly errors. Further, the axial compression of the reduced diameter member can be easily performed using a simple manual compression tool 50 as shown in FIG.
Further, since the slit portion 27 is provided in the sleeve portion 21 of the reduced diameter member 20, the connection pipe 30 can be confirmed from the outside through the cut portion 27, and the connection pipe 30 is correctly connected to the pipe end contact portion 14 of the joint body. It is possible to prevent insufficient insertion of the connecting pipe 30 into the joint body 11 by confirming whether or not they are in contact.
Further, the confirmation of the completion of the connection work can be easily performed by confirming whether or not the annular portion 24 is in contact with the flange portion 22.
[0013]
FIG. 5 is a partial sectional view before connection showing a second embodiment of the present invention. In this embodiment, there is no locking protrusion 23 to be locked to the joint body of the first embodiment, and the reduced diameter member 200 and the joint body 11 are provided as separate members without being locked. Therefore, the reduced diameter member 200 is substantially the same except for the locking projection 23 of the first embodiment. Further, a flange 22 is provided so as to project on the outer peripheral surface of the joint body 11, and the space between the flange 22 and the annular portion 24 of the reduced diameter member is compressed in the axial direction, and the sleeve portion 201 of the reduced diameter member is formed as in the first embodiment. The outer surface of the connecting pipe 30 is compressed by reducing the diameter of the connecting pipe 30 and is sandwiched between the core 12 and the sealing and withdrawal prevention are performed.
[0014]
FIG. 6 is a partial sectional view before connection showing a third embodiment of the present invention. In this embodiment, the positional relationship between the sleeve portion and the annular portion of the reduced diameter member in the first embodiment is reversed.
That is, the joint body 10 has a cylindrical core 12 to be inserted into the inner surface of the connection pipe 30 as in the first embodiment, and the outer surface of the core 12 is provided with an uneven portion 13 having a sawtooth cross section. Further, a tube end abutting portion 14 against which the end of the connecting tube abuts is provided at the back of the core 12, and a locking concave groove 15 for connecting with the reduced diameter member 20 is provided at the back thereof.
[0015]
The reduced-diameter member 60 includes a sleeve portion 61 having a slit portion 67, a cylindrical annular portion 64, and a shearing portion 65 formed so as to be able to shear between the sleeve portion 61 and the annular portion 64. The difference from the first embodiment is that the reduced diameter member 60 and the joint body 11 are locked. In this embodiment, a plurality of locking protrusions 63 are provided on the annular portion 64 of the reduced diameter member 60 so as to be connected to the joint. It is a point locked in the locking groove 15 of the main body. Further, a flange portion 62 is provided to protrude from the end portion of the sleeve portion 61. The inner diameter of the annular portion 64 is provided to be larger than the outer diameter on the small diameter side of the tapered surface 66, and further provided in a thick cylindrical shape that is more rigid than the sleeve portion 61.
[0016]
By compressing the space between the annular portion 64 and the flange portion 62 formed on the outer surface of the sleeve portion in the axial direction as in the first embodiment, the sleeve portion 61 is pushed into the inner surface of the annular portion 64 by being sheared from the shearing portion 65. The sleeve portion 61 is reduced in diameter on the inner surface of the annular portion 64 by the tapered surface 66 of the sleeve portion 61 having a gradually increasing diameter. Since the sleeve portion 61 is provided with the slit portions 67 at a plurality of locations on the circumference, the diameter is easily reduced. The outer surface of the connecting tube 30 is reduced by the inner surface of the sleeve portion, and the inner surface of the connecting tube is connected to the inner surface of the core 12. The outer surface is compressed to prevent sealing and pull-out.
[0017]
【The invention's effect】
As described above in detail, the sleeve type pipe joint according to the present invention is formed with a minimum number of parts, can be easily and reliably connected, the working time at the time of connection is shortened, and no work mistakes occur.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view showing a state in which a connecting pipe according to a first embodiment of the present invention is mounted.
FIG. 2 is a perspective view showing a reduced diameter member 20 of the first embodiment.
FIG. 3 is a partial sectional view showing a connected state of the first embodiment.
FIG. 4 is a front view showing a state at the time of connection using a manual compression tool 50. FIG.
FIG. 5 is a partial sectional view showing a second embodiment of the present invention.
FIG. 6 is a partial cross-sectional view showing a third embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Pipe joint 11 Joint main body 12 Core 13 Serrated uneven part 14 Pipe end abutting part 15 Locking groove 20, 60 Shrinking member 21, 61 Sleeve part 22 ２３ 23, 63 Locking protrusion 24 Annular part, 64 25 , 65 Shear part 26, 66 Tapered surface 27, 67 Split part 30 Connection pipe 50 Manual compression tool

Claims (2)

It consists of a joint body that have a core unit for supporting and inserted into the inner surface of a connection pipe, the reduced-diameter member which is attached to the outer surface of connecting pipe extrapolated to the core portion reducing the diameter of the connecting tube, the fused diameter member includes a sleeve portion which is provided diametrically contractible, the shear portion provided on thin and each other get stuck on the outer surface of the inner surface and sheared by the shear portion by the axially compressing the sleeve portion of the sleeve portion Ri Do and a reduced diameter annular portion, the inner diameter of the annular portion, is provided with a larger inner diameter than the small diameter side outer diameter of the tapered surface, further wherein the annular portion has a thick cylindrical shape rigid than the sleeve portion The reduced diameter member is made of a synthetic resin, the sleeve portion of the reduced diameter member is provided with a locking portion with the joint body, the reduced diameter member is locked to the joint body, and the annular portion is connected to the joint body. A sleeve-type pipe joint characterized in that the diameter of the sleeve portion is reduced by moving to the side . Consists of a joint body that have a core unit for supporting and inserted into the inner surface of the connecting pipe, the reduced-diameter member which is attached to the outer surface of the connecting tube extrapolated to the core portion reducing the diameter of the connecting tube, the fused diameter member includes a sleeve portion which is provided diametrically contractible, the shear portion provided on thin and each other get stuck on the outer surface of the inner surface and sheared by the shear portion by the axially compressing the sleeve portion of the sleeve portion Ri Do and a reduced diameter annular portion, the inner diameter of the annular portion, is provided with a larger inner diameter than the small diameter side outer diameter of the tapered surface, the annular portion, the thick cylindrical rigid than the sleeve portion The reduced-diameter member is made of synthetic resin, and an engagement portion with the joint body is provided on the annular portion of the reduced-diameter member, the reduced-diameter member is engaged with the joint body, and the sleeve portion is disposed on the joint body side. The sleeve type pipe joint is characterized in that the diameter of the sleeve portion is reduced by moving to the sleeve.