JPH06331077A - Fluid transport piping pipe joint - Google Patents

Abstract

(57) [Summary] [Purpose] To connect fluid transport pipes to each other without causing turbulence in the flowing fluid. [Structure] A straight tubular pipe joint is provided with a small diameter portion 12 at one end and a large diameter portion 11 having an inner diameter larger than that of the small diameter portion 12 at the other end. The large diameter portion 11 and the small diameter portion 12 are connected by a tapered connecting portion 13. On the inner peripheral surfaces of the large-diameter portion 11, the connecting portion 13, and the small-diameter portion 12, concave lines 14 and convex lines 15 extending continuously along the pipe axis direction over the entire length in the pipe axis direction are alternately arranged in the circumferential direction. And the fluid inside each recess 14
And flow along each ridge 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint, and more particularly,
The present invention relates to a pipe joint for fluid transport piping used for connecting fluid transport pipes such as water pipes and gas pipes.

[0002]

2. Description of the Related Art As a fluid transport pipe used for transporting a fluid such as tap water or city gas, a synthetic resin pipe which is not corroded and has excellent chemical resistance is used. It has become. Further, recently, in order to reduce the frictional resistance of transported fluid, as disclosed in JP-A-4-351389 and JP-A-4-95187, on the inner peripheral surface of a synthetic resin pipe, There has been proposed a synthetic resin pipe in which concave lines and convex lines extending along the pipe axis direction are alternately arranged in the circumferential direction.

[0003]

Such a synthetic resin pipe has a smaller frictional resistance of fluid than a synthetic resin pipe having a smooth inner peripheral surface, and can suppress the generation of turbulent flow in the pipe. There are advantages. However, if the inner peripheral surface of the pipe joint used to connect the synthetic resin pipes with concave and convex stripes on the inner peripheral surface is smooth, the smooth inner peripheral surface of the pipe joint causes disturbance. Flow may occur and the flow velocity may decrease. Further, when connecting such synthetic resin pipes having different inner diameters, the concave lines and the convex lines formed on the inner peripheral surface of each synthetic resin pipe are continuous. If it is not, there is a problem that turbulent flow occurs in the discontinuous portion, and the flow velocity also decreases.

The present invention solves such a problem, and an object of the present invention is to connect fluid transport pipes to each other without causing turbulent flow in a fluid flowing therethrough, thus improving transport efficiency. It is an object of the present invention to provide a pipe joint for fluid transportation piping that can be remarkably improved.

[0005]

A pipe joint for fluid transportation pipes of the present invention is a pipe joint for fluid transportation pipes used for connecting fluid transportation pipes, and the pipes are provided over the entire length in the pipe axial direction. Depth 0.1-1.5m extending along the axial direction
It is characterized in that the concave strips of about m are arranged with the convex strips in the circumferential direction of the inner peripheral surface at a pitch of about 0.1 to 6.0 mm, thereby achieving the above object. To be done.

[0006]

In the pipe joint for fluid transport pipe of the present invention, the fluid flowing from the fluid transport pipe flows along the concave and convex lines extending in the axial direction of the pipe which are alternately formed in the circumferential direction of the inner peripheral surface. By doing so, the generation of turbulence is suppressed, and the fluid transport efficiency is improved.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a pipe joint for fluid transportation piping according to the present invention, and FIG. 2 is a front view thereof. This pipe joint is used for connecting synthetic resin pipes in which concave lines and convex lines extending in the pipe axis direction are alternately provided in the circumferential direction of the inner peripheral surface. The pipe joint of this embodiment is used when the inner diameters of the synthetic resin pipes to be connected are different. This pipe joint is provided at one end so that a large diameter synthetic resin pipe is connected, and at the other end so that a small diameter synthetic resin pipe is connected. Small diameter portion 12 and this small diameter portion 12
To the large-diameter portion 11, the connecting portion 13 has a tapered shape by sequentially increasing the diameter.

Large-diameter portion 11, connecting portion 13, and small-diameter portion 1
2 are coaxial with each other, and concave lines 14 and convex lines 15 extending in the tube axis direction are alternately arranged on the inner peripheral surfaces of the inner peripheral faces. Therefore, the adjacent concave lines 14 are in a state of sandwiching the convex line 15. Each concave line 14 and convex line 15 are continuous over the entire length of the pipe joint from the end surface of the large diameter portion 11 to the end surface of the small diameter portion 12. Therefore, the depth of each groove 14 and the height of each ridge 15 in the large-diameter portion 11 are equal to the depth of each groove 14 and the height of each ridge 15 in the small-diameter portion 12. , The interval between the concave line 14 and the convex line 15 in the large-diameter portion 11 is
It is larger than the interval between the concave stripes 14 and the convex stripes 15 in the small diameter portion 12.

The depth of each concave line (height of the convex line 15) is 0.
The pitch of the concave stripes is 0.
It is about 1 to 6.0 mm, preferably about 0.1 to 3.0 mm.

The pipe joint having such a structure is manufactured, for example, as follows. First, on the inner peripheral surface of a straight tube made of synthetic resin having a constant inner diameter and outer diameter, concave lines and convex lines extending in the pipe axis direction are alternately formed in the circumferential direction over the entire length. Next, one end of the synthetic resin pipe is heated and inserted into a mold having an inner peripheral surface corresponding to the outer shape of the large-diameter portion 11, and the inside of the mold is evacuated to generate the end. The outer peripheral surface of the part is brought into close contact with the inner peripheral surface of the mold to expand the diameter. Thereby, the large diameter portion 11 connected to the small diameter portion 12 via the connecting portion 13 is formed at one end. On the inner peripheral surface of the large diameter portion 11,
The concave line 14 and the convex line 1 formed on the inner peripheral surface of the small diameter portion 12
5, a concave line 14 and a convex line 15 are formed.

The pipe joint of the present invention can be manufactured not only by such a manufacturing method but also by an injection molding method or the like.

The pipe joint manufactured as described above has a large-diameter portion 11 in which concave and convex ridges having the same shape and size as the concave ridges 14 and the convex ridges 15 arranged in the large-diameter portion 11. The synthetic resin pipes formed with are abutted and connected by fusion. In this case, the respective concave lines of the synthetic resin pipe and the concave lines 14 of the pipe joint, and the convex lines of the synthetic resin pipe and the convex lines 15 of the pipe joint are butted against each other. Also,
Also in the small-diameter portion 12, the concave stripes 1 arranged in the small-diameter portion 12
4 and the ridges 15, the synthetic resin pipes in which the ridges and ridges having the same shape and size are formed are butted against each other in a state where the ridges and the ridges are aligned, and are connected by fusion bonding. .

The pipe joint of the present invention is not limited to such a straight pipe, but may be, for example, a curved pipe bent substantially at a right angle as shown in FIG. In this curved pipe joint, a middle portion of a large diameter portion 21 provided at one end portion is bent at a substantially right angle, and a small diameter portion 2 is connected to the bent portion via a connecting portion 23.
2 are continuously provided. Then, over the entire length of the inner peripheral surface of the pipe joint, concave ridges 24 and convex ridges 25 that are bent and extend substantially at right angles along the axial direction are provided alternately in the circumferential direction.

In the pipe joint of this embodiment, the large-diameter portion and the small-diameter portion at each end are connected to the synthetic resin pipes connected to each end by fusion bonding. A flange may be provided on each end surface of the small-diameter portion and each synthetic resin pipe may be connected by flange coupling.

[0016]

As described above, in the pipe joint for fluid transportation piping of the present invention, since the concave lines and the convex lines extending along the pipe axis direction are alternately arranged in the circumferential direction on the inner peripheral surface, Since the fluid flows along the concave and convex lines, the occurrence of turbulence is suppressed, and the fluid transport efficiency is significantly improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a pipe joint for fluid transportation piping of the present invention.

FIG. 2 is a front view of the pipe joint for fluid transport piping.

FIG. 3 is a perspective view showing another example of the pipe joint for fluid transport piping of the present invention.

[Explanation of symbols]

 11 large diameter part 12 small diameter part 13 connecting part 14 concave line 15 convex line 21 large diameter part 22 small diameter part 23 connecting part 24 concave line 25 convex line

Claims (1)

[Claims] 1. A pipe joint for fluid transportation piping used for connecting fluid transportation pipes, wherein the depth extends along the pipe axial direction over the entire length in the pipe axial direction, and the depth is 0.1 to 1.5 mm. The degree of recess is 0.1-6.0
A pipe joint for fluid transportation, characterized in that it is arranged with a ridge in the circumferential direction of the inner peripheral surface at a pitch of about mm.