JPH02556Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a heat insulating pipe having a supply pipe to which a heating pipe is attached, and a heat insulating layer with improved heating efficiency.

(Prior art) For transporting fluids that require heating and heat retention, such as highly viscous fluids such as heavy oil, and caking fluids such as benzene and phthalic anhydride. A heat insulating pipe is used in which a heating pipe for heating the fluid is attached to the supply pipe in the axial direction of the pipe, and these are surrounded by a heat insulating layer. In this type of heat-insulated tube, a temperature difference of 40 to 70° C. occurs between the temperature of the supply tube and the temperature of the heating tube, so that the heating tube expands and contracts due to thermal expansion.

As shown in FIG. 4, this type of heat-insulated tube is provided with a tube body 6' along the tube axis direction on the outer peripheral surface of the supply tube 2', and a heating medium is passed through the tube body 6'. In addition to inserting the pipe 3', a heat insulating layer 4' made of a foam material such as foamed urethane is provided around the outer periphery of the supply pipe 2' and the pipe body 6', and a protective outer pipe 5' is provided on the heat insulating layer 4'.
Some are equipped with. This heat insulating tube 1' was disclosed in Japanese Utility Model Application Publication No. 58-63490, and was suitable because it did not require welding of the heating tube and the foam material and allowed the heating tube to freely expand and contract. .

(Problem to be solved by the invention) However, in order to install the heating tube 3' inside the tube body 6', a space is inevitably formed around the heating tube 3', which deteriorates the heating efficiency of the supply tube 2'. There was a drawback.

SUMMARY OF THE INVENTION In view of such problems, an object of the present invention is to provide an insulated pipe in which a heating pipe is attached to a supply pipe, and the heating efficiency of the heating pipe is high.

(Means to solve the problem) The following measures will be taken to achieve the above purpose.
That is, a heating tube is movably provided on the outer surface of the supply pipe in the axial direction of the supply pipe, a heat insulating layer made of a foam material is formed on the outer peripheral surface of the supply pipe to which the heating pipe is attached, and the heat insulating layer is covered with an exterior covering. In the insulated pipe to which the pipe is attached, an attached space defined by a part of the side wall of the supply pipe and a recess formed on the supply pipe side of the heat insulating layer is formed along the pipe axis direction, and the attached space is A heating tube was disposed within the space and filled with insulating fibers to urge the heating tube against the side wall of the supply tube.

(Function) According to the above means, in the heat insulating layer made of foam material,
An attached space containing the heating pipe and using part of the side wall of the supply pipe as a partition wall is provided along the pipe axis direction, and the space is filled with insulating fibers to urge the heating pipe against the side wall of the supply pipe. is slidable in the axial direction of the supply pipe in close contact with the side wall of the supply pipe.

(Example) Next, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention, in which a heat insulating pipe 1
Mainly includes a supply pipe 2 for flowing a fluid for transportation purpose, and a pair of heating pipes 3, 3 extending in the pipe axis direction in a state in which the supply pipe 2 is slidably in contact with the outer surface of the supply pipe 2.
, a heat insulating layer 4 formed around the supply pipe 2 including the heating pipes 3 and 3, and an exterior pipe 5 attached to the outer periphery of the heat insulating layer 4 to protect it.

The supply pipe 2 is made of a material that does not easily deform when heated by the heating pipe 3, such as a metal pipe such as a steel pipe, a stainless steel pipe, an aluminum pipe, or a copper pipe.

The heating tube 3 is a tube for flowing a heat medium, and is usually made of a metal tube. The heating tube 3
is defined by a part of the side wall of the supply pipe 2 and a recess 9 formed on the supply pipe 2 side of the heat insulating layer 4 into which the partition wall member 6 having a U-shaped cross section is tightly fitted, and It is arranged in an attached space 8 formed along the line, and is urged to come into close contact with the side wall of the supply pipe 2 by insulating fibers 7 such as glass wool or rock wool filled in the attached space 5. There is. Therefore, the heating tube 3 can efficiently heat the supply tube 2, and is slidable in the tube axis direction without being restricted. Further, the heat of the heating tube 3 is insulated by the heat insulating fiber 7, and does not have any adverse effect on the heat insulating layer 4. Note that the partition wall member 6 is made of synthetic resin tape,
A gutter-shaped synthetic resin molded body or the like is used.

The heat insulating layer 4 is made of an organic foam material such as urethane foam, and insulates the supply pipe 2 and heating pipe 3 from the outside air.

An exterior pipe 5 made of a zinc spiral duct, a thin-walled steel pipe, or the like is attached to the heat insulating layer 4 to protect the heat insulating layer 4.

Next, a method for attaching the heating tube 3 to the supply tube 2 will be described in detail.

First, as shown in FIG. 2, the heating tube 3 is attached to the supply tube 2 using a narrow thin metal holder 10. The holder 10 has a size that fits in the attached space 8, and is welded to the side wall of the supply pipe 2 at an appropriate interval.

Next, the temporarily installed heating pipe 3 is urged toward the supply pipe 2 side, and a heat insulating fiber 7 such as rock wool is wrapped around it, and the heating pipe 3 is closed by a partition member 6 such as a synthetic resin tape. The included heat insulating fibers 7 are adhesively fixed to the side wall of the supply pipe 2. Thereafter, an exterior tube 5 is provided concentrically with the supply tube 2, and an organic foam material such as urethane foam is filled between the exterior tubes 5 and a heat insulating layer 4 to form a heat insulating tube 1.

FIG. 3 shows a second embodiment of the present invention. In this embodiment, the heat insulating layer 4 includes a first heat insulating layer 4a attached to the supply pipe 2 with an inorganic adhesive; It consists of a heat insulating layer 4a and a second heat insulating layer 4b filled between the outer tube 5. The first heat insulating layer 4a is made of an inorganic material with excellent heat resistance and fire resistance, such as calcium silicate or water-repellent pearlite.
The heat insulating layer 4b is made of an inorganic foam material such as foamed alumina. In this embodiment, since such an inorganic material is used as the heat insulating layer 4, it has a high heat resistance temperature.
It is also suitable for its excellent fire resistance. Note that if a thermally and chemically stable primer layer (for example, modified acrylic resin, silicone resin, etc.) is provided between the first heat insulating layer 4a and the second heat insulating layer 4b, when the foaming material is in a solution state, the solvent It is possible to prevent the components from being absorbed into the first heat insulating layer 4a, and there is no unfoamed portion, which is preferable.

An attached space 8 is attached to the first heat insulating layer 4a, extending over a part of the supply pipe 2 side in the pipe axial direction,
The heating tube 3 is housed in the attachment space 8, is urged toward the supply tube 2 by the insulating fibers 7 filled in the space 8, and is slidably attached to the outer surface of the supply tube 2.

In the first and second embodiments described above, a pair of left and right heating pipes are attached to the supply pipe, but the present invention is not limited to this, and it goes without saying that a single heating pipe may be used. be.

(Effects of the invention) As explained above, the present invention forms an attached space along the pipe axis direction that is partitioned by a part of the side wall of the supply pipe and a recess formed on the supply pipe side of the heat insulating layer. Since the heating pipe is installed in the attached space and is filled with insulating fibers to urge the heating pipe against the side wall of the supply pipe, the heating pipe is always in close contact with the side wall of the supply pipe and does not connect directly to the supply pipe. It can be heated and the thermal efficiency can be improved. Furthermore, even if an organic foam material is used as a heat insulating layer, since the heating tube is surrounded by insulating fibers, the foam material will not be welded to the heating tube and be restrained, and the sides of the supply tube will resist thermal expansion and contraction. It is slidable and the heat insulating layer does not change in quality due to heat.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a heat insulating pipe according to the first embodiment of the present invention, Fig. 2 is a partial sectional view of a supply pipe showing how the heating pipe is installed, and Fig. 3 is a sectional view of a heat insulating pipe according to the second embodiment. , FIG. 4 is a sectional view of a conventional heat insulated pipe. 1... Insulated pipe, 2... Supply pipe, 3... Heating pipe,
4...Insulating layer, 5...Exterior pipe, 7...Insulating fiber,
8...attached space, 9...recess.

Claims (1)

[Scope of utility model registration request] A heating pipe is movably provided on the outer surface of the supply pipe in the pipe axial direction, a heat insulating layer made of a foam material is formed around the outer periphery of the supply pipe to which the heating pipe is attached, and an exterior pipe is attached to the heat insulating layer. In the insulated pipe, an attached space defined by a part of the side wall of the supply pipe and a recess formed on the supply pipe side of the heat insulating layer is formed along the pipe axis direction, and in the attached space A heat insulating pipe characterized in that a heating pipe is disposed therein and the heating pipe is filled with heat insulating fibers to urge the heating pipe against the side wall of the supply pipe.