JPS587180Y2 - Soft pipe fitting device - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a pipe joint device for soft pipes such as polyethylene.

[Technical background of the invention and its problems]

In general, soft pipes such as polyethylene resin are easily deformed.
Since it is slippery, it has the disadvantage that it is easy to remove using ordinary pipe joint devices.

[Purpose of invention]

The present invention provides a pipe joint device that prevents deformation of soft pipes such as polyethylene resin by sandwiching the connecting ends of the pipes to be connected between a core pipe and a tightening pipe, thereby eliminating the risk of disconnection. The purpose is to

[Summary of the idea]

The structure of the present invention includes a core tube 6 made of synthetic resin that is fitted inside the end of the connected tube 7, and a threaded portion 12 that is fitted outside the end of the connected tube 7 and formed on the inner circumferential surface. A fastened portion 11 having an engaging portion 13 whose diameter gradually decreases toward one end on its outer circumferential surface and has a plurality of axial grooves 11a and whose diameter gradually decreases toward the other end. Synthetic resin tightening tube 9 formed with
and a notched stepped portion 5 that is engaged with the engaging portion 13 of the tightening tube 9.
is formed on the end of the inner peripheral surface 3 and a thread 2a is formed on the outer peripheral surface. A nut 15 made of synthetic resin and having a protruding strip 16 having a tapered inner circumferential surface that is engaged with the attached portion 11, and the protruding strip 1 of this nut 15.
A reinforcing ring body 17 made of metal that is provided in the inner cavity of the tube 6 and engages the tapered inner circumferential surface formed continuously with the tapered inner circumferential surface of the protruding strip 16 with the tightened portion 11 of the tightening tube 9. and the above-mentioned tightening pipe 9
and an O-ring 14 which is sandwiched and held between the tip of the engaging part 13 of the joint body 1 and the inner end of the notch step part 5 of the joint body 1 and abuts against the outer circumferential surface of the pipe to be connected 7. A flange 8 that engages with the end surface of the connected pipe 7 is formed at the base of the pipe 6, and the joint body 1
A protrusion 4 is provided on the inner circumferential surface 3 of the collar portion 8 to engage with the end surface of the collar portion 8 on the opposite side of the surface that engages with the connected pipe 7,
In this way, the core tube 6 is inserted into the inner periphery of the tube end of the tube I to be connected, the flange 8 thereof is brought into contact with the end surface of the tube 7 to be connected, and the tightening tube 9 is attached to the tube 7 to be connected. At a position 1 at a predetermined distance from the tube end, the connected tube 7 is fitted onto the outer periphery of the connected tube 7 while being rotated, and at this time, the threaded portion 12 provided on the inner peripheral surface of the tightened tube 9 is fitted onto the outer circumference of the connected tube 7. The O-ring 14 bites into the surface of the soft pipe 7 to be connected, so the pipe 7 to be connected will not be removed from the pipe 9. After that, the joint main body 1 is fitted, that is, the pipe end portions of the pipes to be connected 7 at the predetermined intervals are fitted to the inner circumferential surface 3 of the joint main body 1, and the flange of the core pipe 6 is fitted. 8 into contact with the protrusion 4,
At this time, the O-ring 14 is connected to the tip of the tightening tube 9 and the notch step 5.
Since the clamping tube 9 and the joint body 1 come into close contact with each other, the engaging portion 13 of the clamping tube 9 comes into contact with the notch step portion 5, and then the Nut 1 passed through tube 7
5 is screwed together with the screw 2a of the joint body 1, and at this time,
The protruding strip 16 of the nut 15 and the reinforcing ring 1 inside it
The tightened portion 11 of the tightened tube 9 is pressed inward by the tapered inner circumferential surface of the tightened tube 7, and the tightened portion 11 is reduced in diameter by the cut groove 11a and is crimped onto the connected tube 7. The connecting pipe 7 and the tightening pipe 9 are sufficiently tightly fixed.

Note that due to the difference in the materials between the nut 15 and the reinforcing ring 17 and the difference in the positional relationship between the protruding strip 16 of the nut 15 and the reinforcing ring 17, the protruding strip 16 and the reinforcing ring 17 may be the same. Even when the tapered surface with an inclination angle is in contact with the part to be tightened 11, the resistance that the reinforcing ring body 17 receives from the part to be tightened 11 is greater than the resistance that the protruding strip 16 receives from the part to be tightened 11. In this respect, by providing the reinforcing ring body 17, the force applied to the protruding strip 16 can be reduced and breakage of the nut 15 can be effectively prevented.

[Example of idea]

Next, the present invention will be explained with reference to an embodiment shown in the drawings.

Reference numeral 1 designates a joint body, and this body 1 has a cylindrical shape, and a rotation operation part 2 is formed in the center of the outer peripheral surface in the axial direction. Threads 2a, 2a are provided on the outer circumferential surface extending in opposite directions.

In addition, a protrusion 4 is provided in the axial center of the inner circumferential surface 3 of the joint body 1 in an annular manner along the inner circumference, and furthermore, a protrusion 4 is provided at both ends of the inner circumferential surface 30 of the joint body 1 from the inside to the outside. Notch step portions 5, 5 are provided in an annular shape that widens toward the front.

Next, reference numerals 6, 6 are core tubes, and these core tubes 6, 6 are inserted tightly into the inner periphery of soft connected tubes 7, 7, such as polyethylene resin tubes, from their tube ends.

The core tubes 6, 6 are formed into a truncated conical cylinder whose diameter gradually increases from the distal end so that the connected tubes 7, 7 can be easily inserted therein. Also, the proximal end has an annular flange on the outer periphery. 8, 8 are provided, and the flanges 8, 8 come into contact with the ends of the pipes 7, 7 to be connected, as well as with the protrusion 4 of the main body 1.

Reference numerals 9 and 9 designate a pair of tightening tubes, the outer circumferential surfaces of which have their maximum diameters slightly inward from the center in the axial direction, and their maximum diameter portions io, io.
A tapered engaging portion 13.13 that gradually decreases in diameter from the top toward one end and engages with the notch step portions 5, 5 of the main body 1, and a diameter that decreases from the maximum diameter toward the other end. Tightened portion 11 having a gently sloped tapered shape. ．． 11 are formed respectively.

Further, several grooves 11a, 11a are formed in the axial direction on the tightened portions 11, 11 of the tightening tubes 9, 9 at equal intervals on the circumference.

The inner circumferential surfaces of the tightening tubes 9, 9 are cylindrical with the same diameter, and threaded portions 12, 12 are provided on the distal ends thereof to be screwed onto the outer peripheries of the connected tubes 7, 7.

Reference numerals 14 and 14 denote O-rings, which are sandwiched and held between the inner end of the tightening tube 9°9 and the inner end of the cutout step portions 5, 5 of the main body 1, and is in contact with the outer peripheral surface of the

Next, a pair of oaks) 15.15 are configured in a cylindrical shape, and at one end, an annular protruding strip 16, 16 of a constant width having an inner circumferential surface tapered toward the inside is formed integrally with the cylindrical portion. There is.

Screws 15a, 15a that are screwed into the screws 2a, 2a of the joint body 1 are provided on the circumference of the nuts N5, 15, and the protruding strips 16 of the nuts 15, 15 are provided.
, 16 are provided with metal reinforcing rings 17, 17 having annular grooves 17a, 17a formed on the outer periphery and tapered inner peripheral surfaces formed on the inside.

The annular grooves 17a, 17a are fitted into convex portions provided on the inner peripheral surface of the nut 15.15.

Further, the tapered inner circumferential surfaces of the protruding strips 16, 16 of the nut 15.15 and the tapered inner circumferential surfaces of the reinforcing rings 17, 17 are adapted to engage with the tightened portions 11.11 of the tightening tubes 9, 9. It is formed into a continuous slope.

The tapered inner circumferential surfaces of the protruding stripes 16, 16 and the reinforcing rings 17, 17 absorb the longitudinal tightening force of the connected pipes 7, 7 caused by the screwing of the nuts N5, 15 to the tightening tubes 9. 9 is converted into a tightening force that presses the tightened parts 11, 11 inward.

Fitting body 1, oak) 15, 15, tightening pipe 9, 9
If the core tubes 6, 6 are molded from a synthetic resin such as Duracon resin, they will have excellent wear resistance and mechanical strength, which is optimal.

Further, the O-rings 14 and 14 are molded from rubber.

[Effect of idea]

As described above, according to the present invention, since the structure is such that the core tube 6 is inserted into the connected tube 7, deformation of the connected tube I can be prevented even if the connected tube I is soft. Since the tube I can keep its shape constant, it will not come out from the fitting portion.

Since the threaded part 12 is provided on the inner surface of the tightened pipe 9, the threaded part 12 bites into the soft pipe to be connected 7, and the clamped pipe 9 and the pipe to be connected 7 are sufficiently fixed, and the pipe to be connected is 7 does not come off when pulled out, and the tightened portion 11 of the tightening pipe 9 is secured by the protruding strip 16 of the nut 15 that is screwed into the screw 2a of the joint body 1.
is pressed inward and reduced in diameter by the cut groove 11a, and is crimped onto the connected tube 7, so that the connected tube 7 and the tightening tube 9 are sufficiently tightly fixed.

Furthermore, since a reinforcing ring body 17 is provided in the inner hollow part of the protruding strip 16 of the nut 15, the tightening tube 9 together with this reinforcing ring body 17
It is possible to prevent the protrusion 16 that tightens the tightened portion 11 from being damaged, and the durability can be improved.

Since the flange 8 was provided on the proximal end side of the sludged core tube 6, this flange 8
can prevent the core pipe 6 from sinking into the inside of the connected pipe 7, and also prevent the connected pipe 7 and the protrusion 4 of the joint body 1 from collapsing.
It is possible to ensure close contact with the

Moreover, since the raised part 4 is provided on the inner peripheral surface of the joint body 1, the raised part 4 comes into contact with the collar part 8 of the core pipe 6 fitted to the connected pipe 7, and this collar part 8 Also, the joint at the end of the connected pipe 7 can be prevented from moving, and the joint can be kept airtight.

Except for the reinforcing ring 17 and the 01J ring 14, all other parts are made of synthetic resin, and the reinforcing ring 17 is made of metal, so most of the device is molded from synthetic resin and can be provided at low cost. Not only that, but the metal reinforcing ring 17 can effectively prevent the creep phenomenon and breakage caused by tightening, which are disadvantages of the synthetic resin nut 15.

Furthermore, an O-ring 14 that comes into contact with the outer circumferential surface of the connected pipe 7 is sandwiched and held between the tip of the engaging part 13 of the tightening pipe 9 and the inner end of the notch step part 5 of the joint body 1. Therefore, even if the adhesion between the protrusion 4 of the joint body 1 and the flange 8 of the core tube 6 is impaired, the O-ring 14 at the predetermined position ensures that fluid leaks to the outside. It is not necessary to insert the pipe 7 to be connected at a fixed position on the inner circumferential surface 3 of the joint body 1 so that the flange 8 comes into contact with the protrusion 4. Even if the connecting tube 7 cannot be inserted near the protrusion 4 due to the length, etc., there is a degree of freedom in operation that allows this for the sake of sealing.

Furthermore, the effects of the reinforcing ring body 17 will be described in detail.
The tapered inner circumferential surface of this reinforcing ring body 17 is a tapered surface having the same inclination angle as the tightened portion 11 of the tightening tube 9, and is in continuous contact with the tapered inner circumferential surface of the protruding strip 16 of the nut 15. Even in this case, the protruding strip 16 of the nut 15 is made of synthetic resin and is a part provided on the protruding strip, so it is deformed in the expansion direction compared to the reinforcing ring 17 due to the resistance from the tightened portion 11. The reinforcing ring body 17 is made of metal and the protrusions of the nut 15 cannot be tightened with strong force even if the nut 15 is screwed forward. Since it is provided in the inner hollow part of the strip 16, as the nut 15 is threaded, the reinforcing ring 17 allows the tightened part 11 to be tightened into the nut 15 without being deformed by the resistance force from the tightened part 11. It can be tightened with a strong force proportional to the screwing of the screw, and it has an engaging portion 13 on the outer circumferential surface that gradually becomes smaller in diameter toward one end, and has a plurality of axial grooves 11a at the other end. A clamping tube 9 made of synthetic resin having a tightened portion 11 whose diameter gradually decreases toward the side, and a protruding strip having a tapered inner curved surface that is engaged with the tightened portion 11 of the tightening tube 9. The nut 15 with the part 16 formed thereon and the tapered inner circumferential surface of the nut 15 provided in the inner hollow part of the protruding strip 16 and formed continuously with the tapered inner circumferential surface of the protruding strip 16 are tightened on the pipe 9. Due to the related structure consisting of the reinforcing ring body 17 that engages with the tightened part 11, the reinforcing ring body 17
is located closer to the engaging portion 13 than the protruding strip 16, that is, on the inner end side of the cut groove 11a.
It is more difficult to compress the inner end of the groove 1a by pressing the inner end of the groove 11a than to contract the tip of the cut groove 11a against the protrusion 16. Of these, the force shared by the reinforcing ring body 17 is greater than the force shared by the protruding strips 16, and in this way the nut 15
Due to the difference in the materials between the nut 15 and the reinforcing ring 17, and the difference in the positional relationship between the protruding strip 16 of the nut 15 and the reinforcing ring 17, the protruding strip 16 and the reinforcing ring 17 have the same inclination angle. Even if the tapered surface is in contact with the tightened part 11,
The resistance force that the reinforcing ring body 17 receives from the tightened part 11 is larger than the resistance force that the protruding strip part 16 receives from the tightened part 11, and in this point, by providing the reinforcing ring body 17,
This has the effect of reducing the force applied to the protruding strip 16 and effectively preventing damage to the nut 15.

[Brief explanation of drawings]

The figure is a front view with the upper half of the flexible pipe joint device cut away showing an embodiment of the present invention. 1...Joint body, 2a...Screw, 3.
...Inner circumferential surface of joint body 1, 4...Protrusion, 5...Notch step, 6...Core tube, 7.
... Connected pipe, 8 ... Flange of core pipe 6, 9
...Tightening pipe, 11...Tightened part of the fastening pipe 9, 11a... Cut groove of the fastening pipe 9, 12...
... Threaded part of tightening tube 9, 13... Engaging part of tightening tube 9, 14... O-ring, 15...
Nut, 16...Protruding strip of nut 15, 17
...Reinforcement ring.

Claims (1)

[Scope of utility model registration request] A core tube 6 made of synthetic resin that is inserted inside the end of the connected tube 7
A threaded portion 12 is formed on the inner circumferential surface of the pipe T to be connected, and an engaging portion 13 is formed on the outer circumferential surface, the diameter of which gradually decreases toward one end. A tightening tube 9 made of synthetic resin and having a tightened portion 11 having a plurality of grooves 11a and whose diameter gradually decreases toward the other end, and this tightening tube 9.
A joint body 1 made of synthetic resin, in which a cutout step 5 to be engaged with the engaging part 13 of the joint body 1 is formed at the end of the inner peripheral surface 3 and a screw 2a is formed on the outer peripheral surface, and a screw 2a of the joint body 1. A nut 15 made of synthetic resin and having a protruding strip 16 formed on the inner side thereof and having a tapered inner circumferential surface that is engaged with the tightened portion 11 of the tightening tube 9, and a protruding strip of this nut 15. A reinforcing ring body 17 made of metal and having a tapered inner circumferential surface formed continuously with the tapered inner circumferential surface of the protruding strip 16, which is provided in the inner cavity of the ring member 16, engages with the tightened portion 11 of the tightening tube 9. and an O-ring 14 which is sandwiched and held between the tip of the engaging portion 13 of the tightening tube 9 and the inner end of the notch step 5 of the joint body 1 and abuts against the outer circumferential surface of the connected tube 7. A flange portion 8 that engages with the end surface of the connected tube 7 is formed at the base of the core tube 6, and a flange portion 8 that engages with the end surface of the connected tube 7 is formed on the inner circumferential surface 3 of the joint body 1. A soft pipe fitting device characterized in that a protrusion 4 that engages with an end face opposite to an engagement face with a flexible pipe fitting device is provided.