JP2000257781A - Tube fitting for soft tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve sealing performance and to prevent torsion of a tube. SOLUTION: A fastening ring 26 is arranged in a deep part of a socket 18 and an O ring 30 is arranged on more opening side than it on this tube fitting. Consequently, an outer surface of a tube 12 to be sealed by the O ring 30 is never marred by a biting tooth 32 of the fastening ring 26. Additionally, as a taper ring 28, a pressing ring 38, etc., are interposed between the fastening ring 26 and a box nut 16, the fastening ring 26 locked to the outer surface of the tube 12 following the box nut 16 is never rotated.

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 conventional technique, a gasket is disposed at the back of a port for receiving a pipe, a grip member is disposed on the opening side of the port with respect to the gasket, and the grip member is directly tightened with a cap nut, so that the inner surface of the grip member is Of the pipe was cut into the outer surface of the pipe.

[0003]

In the prior art, since the grip member is disposed on the opening side of the receiving port with respect to the gasket, the gasket seals the outer surface of the tube damaged by the grip member. There is a problem that a good sealing performance cannot be obtained.

Further, since the grip member is directly tightened with the cap nut, the grip member may be rotated following the cap nut and the pipe may be twisted.

[0005] Therefore, a main object of the present invention is to provide a pipe joint for a soft pipe which can improve the sealing performance and prevent the pipe from being twisted.

[0006]

SUMMARY OF THE INVENTION According to the present invention, there is provided a body having a receiving port for receiving a soft tube at least at one end side, disposed at a deep portion of the receiving port, a biting tooth is formed on an inner peripheral surface, and an outer peripheral portion is provided. The diameter decreases toward the opening side of the receptacle on the surface.
A fastening ring having a tapered surface, a second tapered surface disposed on the opening side of the receiving port with respect to the fastening ring, inclined in the same direction as the first tapered surface, and the second tapered surface is formed on the first tapered surface; It has a tapered ring to be contacted, a seal member disposed closer to the opening side of the receptacle than the tapered ring, a first screw formed on one of an outer surface and an inner surface of the receptacle, and a second screw that is screwed with the first screw. And it is a pipe joint for soft pipes provided with a screw member for preventing the sealing member from coming off.

[0007]

Since the tightening ring is arranged on the back side of the receiving port with respect to the seal member, there is no fear that the outer surface of the soft tube sealed by the seal member is damaged by the biting teeth of the tightening ring. In addition, since the sealing member and the taper ring are interposed between the screw member and the tightening ring, there is no concern that the tightening ring is rotated following the screw member.

Further, since the distance from the back end of the receiving port to the tightening ring is shorter than before, the length of the inner core attached to the end of the soft tube can be shortened. In addition, since the tightening ring, the taper ring, and the seal member are arranged in the receiving port in order and the screw member prevents the removal of these components, simply removing the screw member requires only removing the screw member.
These parts can be easily removed from the receptacle.

Then, when the soft tube is to be pulled out from the receiving port after the application, the first tapered surface of the tightening ring is pressed against the second tapered surface of the taper ring, the diameter of the tightening ring is reduced, and the biting teeth of the tightening ring are removed. Locked to the outer surface of the soft tube. At this time, the sealing member disposed between the tapering and the screw member is compressed because the tapering is going to be displaced toward the opening side of the receiving port. That is, the compression force of the seal member increases, and the sealing performance is maintained.

[0010]

According to the present invention, the sealing performance can be improved and the pipe can be prevented from being twisted. Further, dismantling workability can be improved.

The above and 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.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A pipe joint 10 for a soft pipe according to this embodiment shown in FIG.
Is for connecting two tubes (soft tubes) 12 made of a soft material such as polyolefin resin (polyethylene, polybutene or polypropylene) as shown in FIG.

As shown in FIG. 1, the pipe joint 10 includes a main body 14 made of resin (vinyl chloride, polyethylene, etc.) or metal (magnesium, etc.), and two cap nuts 16 as screw members. . The main body 14 is formed in a cylindrical shape, and receiving ends 18 for receiving the pipe ends of the pipe 12 are formed at both ends of the main body 14. An enlarged diameter portion 20 is formed on the inner surface of each socket 18 by increasing its inner diameter, and a male screw 22 as a first screw is formed on the outer surface. Also,
A tube 1 is provided at the back of each port, that is, on the inner surface of the center of the main body 14.
An annular stopper 24 for stopping the end of the second tube is formed. Further, inside the enlarged diameter portion 20, a tightening ring 26, a taper ring 28, and an O-ring 30 as a seal member are provided.
Are arranged in this order from the back side of the receiving port 18 toward the opening side.

The tightening ring 26 is formed in a C ring shape from a hard material such as stainless steel or polyacetal resin. Biting teeth 32 having a substantially serrated cross section are formed on the inner peripheral surface of the tightening ring 26.
The outer periphery of 6 is formed with a tapered surface 34 whose diameter decreases toward the opening side of the receiving port 18.

The tapered ring 28 is formed in a ring shape from a hard material such as polyacetal resin or hard vinyl chloride, and has a fastening ring on one end thereof, that is, on the inner surface of the end located on the back side of the receiving port 18. 26 are inclined in the same direction and angle as the tapered surface 34 and the tapered surface 3
A tapered surface 36 that is in contact with 4 is formed. The other end surface of the tapered ring 28, that is, the end surface on the O-ring 30 side is formed as a flat surface orthogonal to the axis of the receiving port 18.

The O-ring 30 is formed in a ring shape from an elastic material such as rubber or the like, and its outer diameter is set to be substantially the same as the inner diameter of the receiving port 18 (the enlarged diameter portion 20). It is set to be almost the same as or slightly smaller than the outer diameter.

The O-ring 3 is formed with the tapered ring 28.
0, the pressing wheel 38 is arranged, and the pressing wheel 3
8 to the O-ring 30 side, and
The cap nut 16 (female screw 40) is screwed into the male screw 22 of the above.

The pressing ring 38 is formed in a ring shape from polyacetal resin, hard vinyl chloride, polyethylene, polypropylene, or the like. The end surface of the pressing ring 38 on the O-ring 30 side is a flat surface orthogonal to the axis of the receiving port 18. The end on the side of the cap nut 16 is connected to the cap nut 16 (the pressing portion 4).
In order to reduce the frictional resistance with 2), it is formed in a semicircular cross section or the like. The pressing ring 38 and the cap nut 16 (the pressing portion 4
In order to further reduce the frictional resistance with 2), a lubricant such as silicon may be applied to these contact portions.

Further, a well-known inner core 44 made of a hard material such as stainless steel or polyacetal resin is arranged inside the receiving port 18. As shown in FIG. 2A, the length L1 of the inner core 44 is the length L from the deep end of the socket 18 to the portion where the fastening ring 26 is mounted.
It is set slightly longer than 2. However, the inner core 44 may be separately prepared at the construction site.

When connecting the pipes 12 using the pipe joint 10, first, the inner core 44 is removed from the receiving port 18 and attached to the pipe end of the pipe 12. On the other hand, by loosening the cap nut 16, the force of pressing the tightening ring 26 in the diameter reducing direction is released, and the force of compressing the O-ring 30 is released. However, when the inner core 44 is separately prepared at the construction site, the work of removing the inner core 44 from the receiving port 18 is not necessary.
If the compression force of the ring 30 is released, the operation of loosening the cap nut 16 is unnecessary.

Then, the pipe end of the pipe 12 on which the inner core 44 is mounted is inserted into the cap nut 16 and the receiving port 18.
When the tip (the inner core 44) of the tube 12 comes into contact with the stopper 24, the insertion of the tube 12 is completed. In this step, the O-ring 30 and the tightening ring 26 are expanded in diameter by the tapered surface 44a formed on the flange of the inner core 44, so that the tube 12 can be easily inserted. In addition, since the tightening ring 26 is disposed on the back side of the receiving port 18 with respect to the O-ring 30, there is no fear that the portion of the outer surface of the tube 12 which is sealed by the O-ring 30 is damaged by the tightening ring 26.

After the tube 12 is inserted, as shown in FIG. 2B, the cap ring 16 is tightened to lock the tightening ring 26 (biting teeth 32) on the outer surface of the tube 12 and the O-ring 30. Compress. In other words, when the cap nut 16 is tightened, the pressing ring 38 is pushed into the inner side of the receiving port 18 by the pressing portion 42 of the cap nut 16, and the tightening ring 26 (tapered surface 34) is
The diameter of the O-ring 30 is reduced by being pressed by the (tapered surface 36), and the O-ring 30 is compressed between the tapered ring 28 and the pressing ring 38. At this time, since the frictional resistance between the cap nut 16 (the pressing portion 42) and the press ring 38 is small, the press ring 38 is not rotated following the rotation of the cap nut 16 and the rotational force of the cap nut 16 is reduced. There is no need to worry about transmission to the O-ring 30 and the tightening ring 26. Therefore, the O-ring 30 and the pipe 12
There is no worry about twisting.

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 26 locked on the outer surface of the pipe 12 causes the tapered surface 3
6, the diameter is further reduced. Therefore, the pinching force of the pipe 12 by the tapered ring 28 and the inner core 44 increases, and the detachment of the pipe 12 is reliably prevented. Further, since the taper ring 28 pressed by the tightening ring 26 further compresses the O-ring 30, the sealing performance can be maintained even when the pipe 12 is slightly elongated.

According to this embodiment, the O-ring 30 can be pressed into contact with the undamaged portion of the tube 12, so that the sealing performance can be improved. Further, since the pressing ring 38 and the tapered ring 28 are interposed between the cap nut 16 and the tightening ring 26, the pipe 12 can be prevented from being twisted.

Then, by simply removing the cap nut 16,
Since the pressing ring 38, the O-ring 30, the taper ring 28 and the tightening ring 26 can be removed, they can be easily disassembled. Further, since the compressive force can be applied to the O-ring 30 only by retightening the cap nut 16, the water stopping performance of the O-ring 30 can be easily recovered.

The tightening ring 26 is connected to the O-ring 30
Since the inner core 44 is disposed on the back side of the receiving port 18, the length L <b> 1 of the inner core 44 can be shorter than that of the related art disposed on the opening side of the receiving port.

In the above embodiment, the pressing ring 38 is interposed between the cap nut 16 and the O-ring 30.
For example, as shown in FIG. 3, the O-ring 30 may be directly pressed by the cap nut 16. A male screw 22 is formed on the outer surface of the socket 18 and the cap nut 16 is screwed into the male screw 22. For example, as shown in FIG. May be formed, and the bolt 48 may be screwed into this. Also, the main body 14
5 or 6, a male thread 50 or a female thread 52 may be formed at one end, and another tube member 54 or 56 may be connected to these.

The present invention is similarly applicable to other types of pipe joints other than the socket type, such as the cheese type, reducer type, and 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 use state of the embodiment in FIG. 1;

FIG. 3 is an illustrative view showing another embodiment of the present invention;

FIG. 4 is an illustrative view showing another embodiment of the present invention;

FIG. 5 is an illustrative view showing another embodiment of the present invention;

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Soft pipe fitting 12 ... Soft pipe 14 ... Main body 16 ... Cap nut 18 ... Receptacle 22 ... Male screw 26 ... Tightening ring 28 ... Taper ring 30 ... O ring 32 ... Biting teeth 34,36 ... Taper surface 38 ... Pressing ring 40 ... female screw

Claims (2)

[Claims] 1. A main body having a receiving port for receiving a soft tube at least at one end side, disposed at a deep portion of the receiving port, a biting tooth is formed on an inner peripheral surface, and an opening of the receiving port on an outer peripheral surface. A tightening ring having a first tapered surface that becomes smaller in diameter toward the side, disposed closer to the opening side of the receiving port than the tightening ring,
A tapered ring having a second tapered surface inclined in the same direction as the first tapered surface, wherein the second tapered surface is in contact with the first tapered surface; A sealing member provided, a first screw formed on one of an outer surface and an inner surface of the receptacle, and a second screw screwed with the first screw, and a screw member for preventing the sealing member from coming off. , Pipe fittings for soft pipes. 2. The pipe joint for a soft pipe according to claim 1, further comprising a pushing member for pushing said seal member into a deep side of said socket when said second screw is screwed.