JPS59114023A - Manufacture of heat insulating material sheathed piping - Google Patents

Abstract

PURPOSE:To strikingly improve the efficiency in operation for sheathing pipings with heat insulating material by a method wherein flexible pipings, into each of which a core bar is temporarily inserted for reinforcement, are inserted into a flexible heat insulating material by utilizing fluid. CONSTITUTION:When the insertion of flexible pipings 2', in each of which a core bar 5 is inserted for reinforcement, into a flexible and hollow heat insulating material 1', the pipings 2' are inserted in the heat insulating material 1' while forming the layer of fluid 4 between the inner peripheral surface of the flexible heat insulating material 1' and each outer peripheral surface of the piping 2' by supplying the fluid 4 such as air or the like from the end of each core bar 5. After the insertion is completed, the supply of the fluid 4 is stopped and a clamp 8 is disengaged and then the core bar 5 is extracted. In such a manner as mentioned above, flexible and long pipings can be sheathed with flexible, long and seamless heat insulating material.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a heat insulating sheathed piping, and particularly to manufacturing a heat insulating sheathed piping in which a flexible and long pipe is coated with a flexible and long seamless heat insulating material. Regarding the method.

As shown in FIG. 1, the conventional manufacturing method for this type of heat insulating jacket piping involves inserting one end of the flexible pipe 2 from the other end of a flexible, seamless hollow heat insulating material with one end closed. Said piping 2
This is a method of inserting the pipe 2 while supplying a fluid 4 such as air from the other end 3 while forming an air layer between the inner peripheral surface of the heat insulating material 1 and the outer peripheral surface of the pipe 2. .

In this way, the outer peripheral surface of the pipe 2 is covered with the heat insulating material 1.

However, this type of manufacturing method has the disadvantage that it is not possible to attach a flexible, long, seamless heat insulating material to a flexible, long pipe because both the heat insulating material 1 and the piping 2 are made of flexible materials. Ta.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the above-mentioned prior art and to provide a method for manufacturing a long heat-insulating jacketed pipe even when the pipe/heat-insulating material is made of a flexible material.

In order to achieve the above-mentioned object, the present invention inserts a hollow mandrel having a thick-walled part at one end that is in close contact with the inner peripheral surface of the pipe and a shape that allows loose insertion at the other end into the pipe, and inserts the mandrel into the pipe. The inserted piping is inserted into the heat insulating material while supplying fluid through the mandrel, and the mandrel is removed after the insertion of the piping is completed.

Preferred embodiments of the present invention will be described below.

FIGS. 2(A) to (C) are explanatory diagrams showing materials used in examples according to the present invention, and FIG. 3 is an explanatory diagram showing an example according to the present invention.

FIG. 2(A) is an explanatory diagram showing the piping 2, FIG. 2(B) is an explanatory diagram showing a mandrel used in this example, and FIG. 2(C) is an explanatory diagram showing a hollow heat insulating material. In these figures, 1' is a flexible, long, seamless hollow heat insulating material, and 2' is a flexible, long pipe, which is largely omitted in the figures.

Further, in the figure, reference numeral 5 denotes a mandrel, and the mandrel 5 has a thick walled part 6 at one end that is in close contact with the inner circumferential surface of the pipe 1', and the other part 7 has a shape that allows loose insertion. It is something. The diameter of the thick portion 6 of the pick and mandrel 5 is made larger than the inner diameter of the pipe 2', and the diameter d of the other portion 7 is made considerably smaller than the inner diameter of the pipe 2'. Further, the mandrel 5 has a hollow shape, and its length is determined to be the length of the pipe 2'.

The heat insulating material jacket piping is formed using the above-mentioned members by the following method.

The manufacturing method of this embodiment will be explained below with reference to FIG.

Insert the mandrel 5 into the flexible pipe 2'. Flexible insulation material 1'
One end of the flexible pipe 2' is closed with a fastener 8.Then, one end of the flexible pipe 2' into which the mandrel 5 is inserted, and one end of the thick inner part 6 of the mandrel 5 are closed. The flexible heat insulating material 1' is slightly inserted into the flexible heat insulating material 1'.Next, a fluid 4 such as air is supplied through the end 9 of the mandrel 5, and the inner circumferential surface 10 of the flexible heat insulating material 1' and the piping 2 are
while forming a layer of fluid between it and the outer circumferential surface 11 of '. After the insertion is completed, the supply of fluid 4 is stopped, the fastener 8 is removed, and the mandrel 5 is pulled out.

FIG. 4 is a sectional view showing a heat insulating material jacketed pipe constructed by inserting two pipes into a heat insulating machine using the method described above.
Two pipes 2', 2' are arranged in the heat insulating material 1'.

As described above, according to 8) 4 of the present invention, a mandrel having a thick-walled part at one end that is in close contact with the inner peripheral surface of the pipe and a shape that allows loose insertion at the other end is inserted into the pipe, and the mandrel is inserted into the pipe. Since it can be inserted into the heat insulating material, it has the effect of being able to cover a flexible, long pipe with a flexible, long, seamless heat insulating material.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram shown to explain a conventional method for manufacturing heat insulating material jacketed piping, and FIGS. FIG. 3 is an explanatory diagram for explaining the method of manufacturing a heat insulator jacketed pipe according to the present invention, and FIG. 4 is a sectional view showing a heat insulator jacket pipe. 1'...・Thermosizer, 2'...Piping, 4...Fluid, 5
... core metal, 6 ... thick wall part, 7 ... other parts. Agent Tatsuyuki Unuma (and 2 others) (5)

Claims (1)

[Claims] (1) A method for manufacturing a heat insulating jacketed pipe in which a flexible pipe is inserted into a seamless flexible hollow heat insulating material, wherein one end has a thick walled part that is in close contact with the inner circumferential surface of the pipe, and the other end A hollow mandrel having a shape that allows loose insertion is inserted into the pipe, the pipe into which the mandrel is inserted is inserted into the hollow heat insulating material while supplying fluid through the core mandrel, and after the insertion of the pipe is completed, the pipe is inserted into the pipe. A manufacturing method for insulation jacket piping that removes gold.