JP2000240874A - Pipe joint for soft pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent loss of a fastening ring, prevent mounting of the ring from being forgetten, and improve assembling workability by forming a ring housing part on an inside of a box nut, and housing the fastening ring in the ring housing part. SOLUTION: Each box nut includes a cylindrical main body 30, a female screw 32 as a second screw is formed on the inner surface of one end part of the main body 30, and a cross section path triangular ring of a housing part 34 is formed on the inner surface of the other end part. An upper surface 36 of the ring housing part 34 is formed in a tape shape, whose diameter is gradually reduced starting from one end part of the main body 30 toward the other end part, and a side surface 38 of one end part of the ring housing part 34 is formed perpendicular to the shaft of the main body 30. A cross section nearly hexagon locking part 40, with which a tool such as a spanner is locked, is formed on the outer peripheral surface of the main body 30. A fastening ring 42 is housed in the ring housing part 34, and a female screw 32 of the box nut 16 is screwed around a male screw 20 of the main body 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fitting for a soft pipe, and more particularly to a fitting for a soft pipe for joining a soft pipe which conveys a fluid such as water, air or oil.

[0002]

2. Description of the Related Art An example of this type of pipe joint for soft pipes is disclosed in Japanese Patent Application Laid-Open Publication No. H8-501863. In this prior art, the clamping ring is housed in a ring housing defined by the inner surface of the nut and the end surface of the compression sleeve.

[0003]

In the prior art, since the ring accommodating portion is constituted by the inner surface of the nut and the end surface of the compression sleeve, when the pipe joint is disassembled, the nut, the tightening ring, and the compression sleeve are removed. It was treated as a completely separate component. For this reason, there is a problem that the fastening ring is lost or forgotten to be mounted, and there is also a problem that the assembly workability is poor due to the large number of parts.

[0004] Therefore, a main object of the present invention is to provide a pipe joint for a soft pipe, which can solve the problems such as the loss of the fastening ring and forgetting to attach it, and can improve the assembling workability.

[0005]

SUMMARY OF THE INVENTION According to the present invention, there is provided a receiving port for receiving a pipe end of a soft tube, a first screw formed on an outer surface of the receiving port, and a pipe formed at a deep portion of the receiving port to stop the pipe end. A main body having a stopper, a packing mounted on the inner surface of the receptacle, and a second screw screwed with the first screw formed on the inner surface of one end;
And, a cap nut having a ring housing portion formed on the inner surface of the other end portion, and a tightening ring housed in the ring housing portion, wherein the ring housing portion has a smaller diameter as going from one end side to the other end side. A soft pipe fitting having a tapered inner surface with a tapered outer surface along the tapered inner surface.

[0006]

The ring accommodating portion is formed on the inner surface of the cap nut, and the tightening ring is accommodated in the ring accommodating portion. Therefore, when the pipe joint is disassembled, the cap nut and the tightening ring can be handled integrally. .

[0007]

According to the present invention, problems such as loss of the fastening ring and forgetting to attach it can be solved, and assembling workability can be improved.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A pipe fitting (socket) 10 for a soft pipe according to this embodiment shown in FIG. 1 connects two pipes 12 made of a soft material such as a polyolefin resin (polyethylene, polybutene or polypropylene) in a straight line. It is for.

The pipe fitting 10 for a soft pipe includes a cylindrical main body 14 made of resin or metal and two cap nuts 16. At both ends of the main body 14, receiving ports 18 for receiving pipe ends of the pipe 12 are provided. It is formed. A male screw 20 as a first screw is formed on an outer peripheral surface of an end of the opening on the opening side of each receiving port 18, and a packing receiving section 22 is formed on an inner inner surface of each receiving port 18. An annular stopper 24 for stopping the pipe end of the pipe 12 is formed on each receiving port 18 on the inner side of the packing accommodating portion 22, that is, on the inner surface of the central portion of the main body 14.
Then, an O-ring 26 is mounted on the packing housing 22. Note that a locking portion 28 for locking a tool such as a spanner may be formed on the outer peripheral surface of the main body 14, as shown in FIG.

Each cap nut 16 includes a cylindrical main body 30, as shown in FIG. The inner surface of one end of the main body 30 has a second
A female screw 32 is formed as a screw, and a ring accommodating portion 34 having a substantially triangular cross section is formed on the inner surface of the other end. The upper surface 36 of the ring accommodating portion 34 is formed in a tapered shape that gradually decreases in diameter from one end side to the other end side of the main body 30. It is formed perpendicular to 30 axes. Also, body 3
A locking portion 40 having a substantially hexagonal cross section for locking a tool such as a wrench or the like is formed on the outer peripheral surface of the zero. Then, a tightening ring 42 as shown in FIG.
Is accommodated, and the female screw 32 of the cap nut 16 is screwed into the male screw 20 of the main body 14.

The tightening ring 42 (FIG. 3) is formed in a substantially C-ring shape from a hard material such as stainless steel or polyacetal resin, and has teeth 44 having a substantially sawtooth cross section on its inner surface. The outer surface of the fastening ring 42 is formed in a tapered shape along the upper surface of the ring accommodating portion 34, that is, along the tapered inner surface 36. The inner diameter of the tightening ring 42 is set to substantially the same size as the outer diameter of the tube 12,
In consideration of reducing the insertion resistance of the tube 12, the tube 12
It is desirable to set the outer diameter slightly larger than the outer diameter.
On the other hand, the height H of the highest part in the tightening ring 42 is
From the outer surface of the tube 12 inserted into the receiving port 18, the ring housing 3
4 is set smaller than the height h up to the maximum diameter portion. Therefore, as shown in FIG. 4, when the tightening ring 42 is located at one end of the ring housing portion 34, the outer surface of the tightening ring 42 and the tapered inner surface 3 of the ring housing portion 32.
6, and at least one between the inner surface of the fastening ring 42 and the outer surface of the tube 12 is provided with a clearance.

When the pipes 12 are connected to each other by using the pipe joint 10 for a soft pipe, the cap nut 16 is rotated so that the side face 38 of the ring accommodating section 34 is connected to the socket 18 as shown in FIG. Position it at or beyond the tip position.
On the other hand, a reinforcing inner core 46 made of a hard material such as stainless steel is attached to the end of the tube 12. The inner core 46 includes a cylindrical main body 48 inserted into the pipe 12, and a flange 50 having a tapered outer surface is formed on an outer peripheral surface of an end portion of the main body 48.

Then, the tube 12 with the inner core 46 attached thereto is inserted into the receiving port 18 from the tip of the cap nut 16.
Then, first, the O-ring 26 passes through the inside of the tightening ring 42, and then the diameter of the O-ring 26 is expanded by the flange 50 (taper outer surface) of the inner core 46 and is pressed against the outer surface of the tube 12. The tip of the pipe 12 (the inner core 46) is
Contacted.

In the state where the tightening ring 42 is located at one end side of the ring accommodating portion 34 (FIG. 4), as described above, between the inner surface of the tightening ring 42 and the outer surface of the tube 12 and the outer surface of the tightening ring 42. A gap is secured in at least one of the gap and the tapered inner surface 36 of the ring housing portion 34. That is, when the inner diameter of the fastening ring 42 is larger than the outer diameter of the tube 12, a gap is secured between the inner surface of the fastening ring 42 and the outer surface of the tube 12, while the inner diameter of the fastening ring 42 is If it is smaller than the outer diameter,
The diameter of the tightening ring 42 is enlarged by the tube 12 so that the inner diameter of the tightening ring 42 becomes the same as the outer diameter of the tube 12, but a gap is secured between the outer surface of the tightening ring 42 and the tapered inner surface 36 of the ring housing 34. Will be. Therefore, when inserting the tube 12, there is no fear that the tube 12 is strongly tightened by the tightening ring 42, and the tube 12 can be smoothly inserted. The insertion resistance may be reduced by applying a lubricant such as silicon to at least one of the outer surface of the tube 12 and the inner surface of the O-ring 26.

After the tube 12 is inserted, a tool such as a wrench is engaged with the locking portion 40 of the cap nut 16 (and the locking portion 28 of the main body 14 (FIG. 5)) to retighten the cap nut 16. I do. Then, the tightening ring 42 is pressed by the tapered inner surface 36 of the ring accommodating portion 34 to reduce the diameter, and the tightening ring 4
Two teeth 44 (FIG. 3) are locked to the outer surface of tube 12 (FIG. 1).

After the application, when an external force in the direction of pulling out the pipe 12 from the receiving port 18 acts on the pipe, the tightening ring 42 locked on the outer surface of the pipe 12 is pressed by the tapered inner surface 36 to reduce the diameter. You. Therefore, the locking force of the tightening ring 42 on the tube 12 increases almost in proportion to the external force, and the tube 1
2 is reliably prevented from being detached.

According to this embodiment, the fastening ring 42
Is housed in the ring housing portion 34 of the cap nut 16, so that when the soft pipe fitting 10 is disassembled, the fastening ring 42 and the cap nut 16 can be handled integrally. Therefore, the fastening ring 42 can be prevented from being lost or forgotten to be mounted, and the assembling workability can be improved.

In addition, the prior art (Japanese Patent Application Laid-Open No. Hei 8-5011863)
In the joint using a compression sleeve such as that described in Japanese Patent Application Laid-Open Publication No. H10-260, it is necessary to secure a space for inserting the compression sleeve on the inner surface side of the receiving port (screw portion). I had to grow. In this embodiment, since there is no need to secure a space for the compression sleeve, the outer diameter of the socket 18 (the portion where the male screw 20 is formed) can withstand the external force when the tube 12 is pulled out from the socket 18. It can be set to the minimum size that can ensure the thickness that can be obtained. Therefore, the size of the main body 14 and the cap nut 16 can be reduced as compared with the related art.

In the above-described embodiment, the receiving ports 18 are formed at both ends of the main body 14. However, as shown in FIG. 6, FIG. 7 or FIG. Alternatively, a connection port other than the reception port 18 may be formed. That is,
6 has a receptacle 18 at one end of the main body 14, a male thread 54 for mounting the cap nut 52 at the other end, and a male thread 54 at the end of the male thread 54. The rubber ring contact surface 56 is formed. In this example,
A union 60 is in contact with the other end of the main body 14 via a rubber packing 58, and the union 60 is connected to the main body 14 using a cap nut 52. Then, a pipe 12 such as polyvinyl chloride is connected to the union 60 through a socket 62.
A different type of tube 64 is connected. The one shown in FIG. 7 has a male thread (taper male thread) at the other end of the main body 14.
66 is formed, and a steel pipe 68 is screwed into the male screw portion 66. And what is shown in FIG.
A female screw portion 70 is formed at the other end of the main body 14, and a steel pipe 72 is screwed into the female screw portion 70.
According to these embodiments, it is also possible to directly connect pipe accessories such as a meter, a water faucet or a water stopcock to the male screw part 54, 66 or the female screw part 70.

In each of the above embodiments, other types of packing such as V packing may be used instead of the O-ring 26. Further, as shown in FIG. 9, a packing housing portion 76 having a tapered inner surface 74 whose diameter gradually increases from the back side to the opening side of the receiving port 18 is formed, and the O-ring 26 is provided in the packing housing portion 76. You may make it attach. In this case, the O-ring 26 is moved to the large-diameter portion by the pipe 12 inserted into the receiving port 18 (FIG. 9A), and the O-ring 26 is moved to the small-diameter portion by the water pressure after construction. (FIG. 9 (B)), the insertion resistance of the pipe 12 can be reduced, and the water stoppage after construction can be improved.

In each of the above-described embodiments, the inner core 46 is attached to the end of the tube 12. However, if there is no concern about deformation of the tube 12 as in the case of a thick wall, the inner core 46 is not necessarily used. It is not necessary to attach 46.

Further, the present invention is similarly applicable to other types of pipe joints for soft pipes other than the socket type such as the cheese type, the reducer type and the elbow type.

[Brief description of the drawings]

FIG. 1 is an illustrative view showing one embodiment of the present invention;

FIG. 2 is an illustrative view showing a state in which a tightening ring is locked on an outer surface of a tube;

FIG. 3 is an illustrative view showing a fastening ring;

FIG. 4 is an illustrative view showing a state in which a tightening ring is located on one end side of a ring housing portion;

FIG. 5 is an illustrative view showing a state where a locking portion for a tool is formed on the main body.

FIG. 6 is an illustrative view showing another embodiment of the present invention;

FIG. 7 is an illustrative view showing another embodiment of the present invention;

FIG. 8 is an illustrative view showing another embodiment of the present invention;

FIG. 9 is an illustrative view showing a modified example of the packing accommodating portion;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Pipe joint for soft pipe 12 ... Pipe 14 ... Main body 16 ... Cap nut 18 ... Receptacle 26 ... O-ring 34 ... Ring accommodation part 42 ... Tightening ring

Claims (2)

[Claims] 1. A body having a receiving port for receiving a pipe end of a soft tube, a first screw formed on an outer surface of the receiving port, and a stopper formed at a back portion of the receiving port for stopping the pipe end. A packing mounted on an inner surface of the receptacle, a cap nut having a second screw screwed to the first screw on an inner surface of one end, and a ring housing formed on an inner surface of the other end; And a tightening ring housed in the ring housing portion, wherein the ring housing portion has a tapered inner surface that decreases in diameter from the one end side toward the other end side, and
The pipe joint for a soft pipe, wherein the tightening ring has a tapered outer surface along the tapered inner surface. 2. An inner diameter of the tightening ring is equal to or slightly larger than an outer diameter of the tube end when the tightening ring is located at the one end side of the ring receiving portion. The pipe joint for a soft pipe according to the above.