JP2002235894A - Piping and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cover with a simple structure for protecting a bending portion of a metallic pipe of fluid piping. SOLUTION: A straight metallic pipe 1 is inserted in a straight metallic pipe cover 2 of a specified length L, and bent and molded together. The metallic pipe cover 2 prevents wear and damage of the bending portion of the metallic pipe 1. The metallic cover is arranged at the bending portion, so that it does not move in an axial direction. The metallic pipe 1 and the metallic pipe cover 2 need not be directly united, and the metallic pipe cover is compact and does not need a lot of assembling man-hours.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a protective cover for a bent portion of a metal pipe used for a pipe for fluid and a method of manufacturing the same.

[0002]

2. Description of the Related Art Since a bent portion of a metal pipe for a fluid is protruding, it may be worn or damaged by contact with other members depending on a use place. When the abrasion or damage progresses and ruptures or breaks, it is extremely dangerous if the fluid is a dangerous substance or if it is under high pressure. Therefore, it has been conventionally performed to provide a protective cover at a bent portion of the pipe.

FIG. 4 is a perspective view showing an example of a conventional protective cover. In FIG. 4, the outer periphery of the bent portion of the metal tube 1 is provided with a rubber tube 10 having a crack 11 provided in the axial direction.
And fastened with a band 12 at predetermined intervals. As the band 12, for example, a resin clamping band or the like is used.

[0004]

However, in the above configuration, it is necessary to cover the rubber tube 10 on the metal tube 1 and fasten it with a plurality of bands 12 at the time of assembling. Become. In addition, the rubber tube has a large thickness, and requires a large space around the periphery to tighten the band 12. Furthermore, since the rubber tube 10 is used, it is susceptible to heat, cannot be used in a high-temperature location, and has poor durability as a coating material.

The present invention has been made in view of the above problems, and prevents wear and damage of a bent portion of a pipe, is compact, requires no space, and can be used in a high-temperature portion. It is an object of the present invention to provide a pipe having excellent durability, a simple structure, a small number of assembly steps, and a low cost, and a method for manufacturing the same.

[0006]

In order to achieve the above object, a first invention is to provide a metal pipe cover of a predetermined length on the outer periphery of a bent portion of a metal pipe used for a fluid pipe. It has a configuration.

According to the first aspect of the present invention, since the metal pipe cover is provided on the outer periphery of the bent portion of the metal pipe, there is little risk of abrasion or damage even when it comes into contact with other members, and the durability is excellent.
Resistant to heat and can be used in places with high temperatures. further,
The metal tube cover is not displaced in the axial direction by being used in the bent part, and the structure is simple because there is no need to directly fix the metal tube and the metal tube cover.Since the cover is a metal tube, it is compact and compact. Do not multiply.

The second invention is a manufacturing method in which a metal pipe for a straight pipe is inserted into a straight metal pipe cover of a predetermined length, and the metal pipe and the metal pipe cover are bent together.

According to the second aspect of the present invention, since the straight metal pipe and the metal pipe cover are bent together, the processing is easy, the number of assembly steps is not required, and the cost can be reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a pipe and a method of manufacturing the same according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a side view of a pipe according to the first embodiment. In FIG. 1, a metal tube cover 2 having a predetermined length L is provided on the outer periphery of a bent portion of a metal tube 1. The length L is long enough to protect the bend. The metal tube 1 has, for example, an outer diameter of 8 mm, and the metal tube cover has, for example, an outer diameter of 10 mm and a wall thickness of 0.7 mm.

FIG. 2 is an explanatory view showing a method of manufacturing a pipe. In FIG. 2, a straight metal pipe cover 2 having a predetermined length L is provided.
Then, the straight metal pipe 1 is inserted, and then the metal pipe 1 and the metal pipe cover 2 are bent together by a bender or the like as shown by a two-dot chain line.

Since the pipe of the present invention is constructed as described above, the metal pipe cover 2 is not displaced in the axial direction even if the metal pipe 1 and the metal pipe cover 2 are not directly connected. The wear and damage of the bent portion of the metal tube can be prevented without taking it. In addition, since it is a metal tube cover, it has excellent durability, and can be used in a high-temperature portion. In addition, since the manufacturing method is as described above, the processing is easy, the number of assembly steps is not required, the structure is simple, and the cost can be reduced.

FIG. 3 is a side view of the pipe of the second embodiment, showing a case where there are two bent portions for one metal pipe cover. Also in this case, the bending is performed together with the metal pipe 1 and the metal pipe cover 2.

[Brief description of the drawings]

FIG. 1 is a side view of a pipe according to a first embodiment of the present invention.

FIG. 2 is an explanatory view of a method for manufacturing a pipe of the present invention.

FIG. 3 is a side view of a pipe according to a second embodiment of the present invention.

FIG. 4 is a perspective view of a conventional pipe.

[Explanation of symbols]

 1 ... metal tube, 2 ... metal tube cover.

Claims (2)

[Claims] 1. A pipe characterized in that a metal pipe cover (2) having a predetermined length is provided on an outer periphery of a bent portion of a metal pipe (1) used for a fluid pipe. 2. A metal pipe (1) for piping a straight pipe is inserted into a metal pipe cover (2) of a straight pipe having a predetermined length, and the metal pipe (1) and the metal pipe cover (2) are put together. A pipe manufacturing method characterized by bending.