JP2596522B2 - Insulated pipe with carbon heating element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention covers an outer peripheral surface of a pipe in a snowfall area or a cold area to prevent freezing of a fluid in a buried pipe near the surface of the ground or a pipe installed outdoors and to prevent rupture of the pipe due to freezing. The present invention relates to a heat insulating pipe used for heat insulation. More specifically, for example, the pipe is used for covering the outer peripheral surface of the water pipe to insulate and insulate the water pipe to prevent freezing and rupture of the water pipe.

[0002]

2. Description of the Related Art Conventionally, this kind of insulated pipe is shown in FIG.
As shown in FIG. 0, the outer peripheral surface of a pipe 01 formed in a tubular shape with a foamed synthetic resin material 03 was simply covered with a resin film 04.

[0003]

Therefore, this type of heat-insulating pipe of the prior art exhibits a certain effect when the fluid in the pipe is constantly moving in the cold season, especially in the extreme cold season. However, when the fluid in the pipe is stagnant, the fluid in the pipe freezes due to poor insulation effect,
Occasionally, the pipe expands due to volume expansion due to freezing of the fluid, causing an accident in which the pipe ruptures and ejects the fluid. It was almost impossible to ask for an insulated pipe.

[0004] Therefore, the present invention provides a method of attaching a heat-insulating pipe, which is almost the same as that of a conventional insulated pipe, without requiring any special attaching technique.
It can be installed relatively easily, and can reliably prevent freezing of the fluid in the pipe even in extremely cold conditions or when the fluid in the pipe is stagnant, ensuring that accidents such as rupture of the pipe can be prevented. It is a main object of the present invention to provide a heat-insulating pipe capable of preventing the above problems and to solve the above-mentioned problems.

[0005]

In order to achieve the above object, the present invention takes the following technical measures. In other words, the heat-insulating pipe according to the present invention has a tubular shape in which a flexible linear heating element 2 in which carbon fiber is used as a core wire 2a and the core wire 2a is coated with an insulating coating material 2b is coated with an outer peripheral surface with a resin coating 4. A state in which at least a part is embedded in the material 3 near the inner peripheral surface of the flexible pipe 1 formed of the foamed synthetic resin material 3 is disposed and fixed along the axial direction of the pipe 1. Things.

In this embodiment, the shape of the flexible pipe 1 may be a so-called cylindrical shape, and a C-shaped cross section having a cut portion 5 along an axial direction at a part in the circumferential direction. In the case of a part formed in a C-shaped section having a cut portion 5 along the axial direction in a part of the circumferential direction, A protruding film 6 having an appropriate width protruding toward the outer peripheral direction along the portion 5 is formed continuously from the resin coating 4, an adhesive 7 is applied to one surface of the protruding film 6, and a release film 8 is temporarily provided on the surface. It can also be implemented as a worn structure.

[0007]

In the heat-insulating pipe P having such a configuration, for example, in the case of the flexible pipe 1 having a cylindrical cross section, the heat-insulated pipe A before the pipe is inserted into the center hole 10 of the flexible pipe 1. The flexible pipe 1 having a C-shaped cross section may be the pipe A to be insulated,
The pipe A to be insulated may be already piped, and the cut section 5 is opened and pushed into the pipe A to cover the pipe A, the cut section 5 is butted, and the outer peripheral surface thereof is taped with an adhesive tape or the like. The connection may be sealed.

After doing so, the linear heating elements 2, 2
One end of each is connected to the electric wire K, and the other end of the heating element 2,
By electrically connecting the two, electricity is supplied to the internal carbon fibers 2a, and the carbon fibers 2a can be heated by this electricity supply.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below based on an embodiment shown in the drawings. The first embodiment shown in FIG. 1 and FIG.
1 shows an embodiment in which a flexible pipe 1 is cylindrical. First, the linear heating element indicated by reference numeral 2 will be described. The linear heating element 2 bundles a large number of long fibers of carbon and collects them into a diameter of 2 to 3 mm to form a core wire 2a.
a is wound with a heat-resistant fiber thread / woven cloth 2c to form a cord, and the outer periphery thereof is covered with a synthetic resin insulating covering material 2b to a thickness of about 0.5 to 1 mm. The core wire 2a is a bundle of carbon fibers, and has a high heat generation efficiency due to a large heat generation area and a high heating efficiency due to emission of far infrared rays. Further, it has flexibility and is very heat-generating in that a desired electric resistance value can be easily set. The insulating coating material 2b is not limited to a synthetic resin material, but may be formed by stacking several layers of heat-resistant fibers.

Thus, the heat insulating pipe P in this embodiment
Has an outer peripheral surface covered with a thin resin coating 4,
In addition, near the inner peripheral surface of the flexible pipe 1 formed by the foamed synthetic resin material 3 formed in a cylindrical shape,
A structure in which the two linear heating elements 2 having the above structure are embedded in the foam material 3 at opposing positions, and are disposed and fixed along the axial direction of the pipe 1. It was done. Center hole 1 in the heat insulating pipe P
The diameter of 0 is substantially equal to the outer diameter of the pipe to be covered, that is, the pipe A to be insulated, as shown by a virtual line in FIGS. Is done.

In the heat-insulated pipe P having such a structure, the heat-insulated pipe A is inserted into the center hole 10 of the flexible pipe 1 before the pipe is inserted, as shown in FIGS. A is a heat insulating cladding tube, and one end side thereof is covered with a cap body CA shown in FIG. 3 as an example. The cap body CA has two conductive (copper) rod-shaped projections 11, 11 having a sharpened tip, and the electric wires K are respectively connected to the copper plates 12, 12 at the base ends thereof. This cap body CA
And the projections 11 and 11 in the heat insulating pipe P.
The linear heating elements 2, 2 are pushed into the carbon fiber core wires 2a, 2a so as to pierce them, cover the pipe P, and are adhered with an adhesive to make them watertight. Further, another cap body CB shown in FIG. 4 is put on the other end side. This cap body CB has two conductive protrusions 11 and 11 like the above-mentioned cap body CA, and the base ends thereof are electrically connected by a copper plate 13. The projections 11 of the cap body CB are connected to the carbon fiber core wires 2 of the linear heating elements 2 in the same manner as described above.
a, 2a is stabbed over the pipe P in such a manner as to pierce the pipe P and is adhered with an adhesive to make it watertight.

In this manner, after the linear heating elements 2 and 2 are electrically connected to each other, the pipes may be piped to a required pipe location in the same manner as a normal pipe. After the piping, when the inside carbon fiber 2a is energized via the electric wire K in severe cold or when it is necessary to keep the fluid in the pipe, the energization causes the carbon fiber 2a
Then, the pipe A is insulated from the outside air temperature and can be positively kept warm at the same time.

As the connecting means when the heat insulating pipe P is shorter than the length of the pipe A to be insulated, that is, as the intermediate connecting means, as shown in FIGS. Are provided at the middle part in the longitudinal direction, and two pipes 11a, 11a are provided on both sides in the longitudinal direction. A cap CC screwed to the wall 14 is used. Pipes P are inserted into the respective projections 11a, 11a from both sides in the same manner as described above, and the carbon fibers 2a,
What is necessary is just to connect and fix with 2a.

FIGS. 7 and 8 show a second embodiment of the heat insulating pipe P. In this embodiment, the flexible pipe 1 has a so-called cylindrical shape. It differs from that of the first embodiment in that a part in the circumferential direction is formed in a C-shaped cross section having a cut portion 5 along the axial direction. Further, in the pipe P of this embodiment, a projecting film 6 having an appropriate width and projecting further in the outer peripheral direction along the cut portion 5 is formed continuously from the resin film 4. And a release film 8 such as release paper is temporarily attached to the surface of the adhesive 7.

The pipe P having a C-shaped cross section may cover the pipe A to be insulated before the pipe as described above, or the pipe P to be insulated already. Can also be coated. In this covering, the pipe A is inserted into the center hole 10 so as to cover the heat-insulated pipe A from the side thereof by opening and pushing the pipe, and then, the cut parts 5 are joined to each other by resin. On the outer peripheral surface of the coating 4, the protruding film 6 from which the release film 8 has been peeled off is
It is adhered to the inner surface with an adhesive 7 applied thereto, connected and connected, and simultaneously sealed in a watertight manner.

The embodiment shown in FIG.
In the third embodiment showing the structure, this pipe P has a C-shaped cross section having a cut portion 5 as in the case of the second embodiment, and has a protruding film having an adhesive 7 and a release film 8. 6. Thus, the cross-sectional shape of the linear heating element 2 is not an arc shape, but an elongated arc shape extending in the circumferential direction along the arc of the center hole 10 of the flexible pipe 1. Insulated pipe P according to the present invention
Can be implemented as such a structure.

Although the embodiments which are considered to be representative of the present invention have been described above, the present invention is not necessarily limited to only those embodiments. For example, a simple C-shaped cross section without the projecting film 6 in the second embodiment and the third embodiment is used, and the cut portion 5 is connected using a tape with an adhesive. Any means can be used, such as applying an adhesive and laminating with a tape. The number of the linear heating elements 2 is not limited to two, but may be four embedded or one. It is also possible to use only one of them to make electrical connection at both ends of the pipe P. In addition, the present invention can be implemented with appropriate modifications as long as it has the above-mentioned constitutional requirements, achieves the object of the present invention, and has the following effects.

[0018]

As is clear from the above description, the heat insulating pipe with a carbon heating element according to the present invention has a flexible linear shape in which carbon fiber is used as a heat source and this core wire is covered with an insulating coating material. Since the heating element is used, it is hardly deteriorated by oxidation and can withstand many years of use, and is excellent in flexibility. It has the advantage that it can easily conform to the shape of A and can be easily coated on the tube.

Further, the heat-insulating pipe of the present invention comprises a wire heating element mainly composed of carbon fibers having the above-mentioned characteristics.
A flexible pipe formed of a tubular synthetic resin material whose outer peripheral surface is covered with a resin film, with at least a portion embedded in the material near the inner peripheral surface of the flexible pipe, disposed along the axial direction of the pipe. Since it has a fixed structure, it can exert a reliable heat insulating effect on the heat insulation of the pipe in a severely cold place.

[Brief description of the drawings]

FIG. 1 is a perspective view of a pipe showing a first embodiment.

FIG. 2 is a sectional view of FIG.

FIG. 3 is a perspective view of a current-carrying connection body.

FIG. 4 is a perspective view of another current-carrying connection body.

FIG. 5 is a perspective view of still another current-carrying connection body.

FIG. 6 is a sectional view of FIG. 5;

FIG. 7 is a perspective view of a pipe according to a second embodiment.

FIG. 8 is a sectional view of FIG. 7;

FIG. 9 is a sectional view corresponding to FIG. 8 of the pipe of the third embodiment.

FIG. 10 is a perspective view of a conventional pipe.

[Explanation of symbols]

 (1) Flexible pipe (2) Linear heating element (2a) Core wire of linear heating element (2b) Insulating coating material for linear heating element (3) Foam synthetic resin material (4) Resin coating (10) Center hole

Claims (3)

(57) [Claims] 1. A core wire (2a) made of carbon fiber.
A flexible linear heating element (2) coated with an insulating coating material (2b) is formed of a tubular synthetic resin material (3) whose outer peripheral surface is coated with a resin coating (4). A heat-insulating pipe with a carbon heating element fixed along the axial direction of the pipe (1) with at least a part embedded in the material (3) near the inner peripheral surface of the pipe (1) . 2. The carbon heating element according to claim 1, wherein the flexible pipe (1) is formed in a C-shaped cross section having a cut portion (5) along an axial direction at a part in a circumferential direction. Insulated pipe. 3. The flexible pipe (1) is formed in a C-shaped cross section having a cut portion (5) along the axial direction at a part in the circumferential direction. )
Protruding film of appropriate width protruding toward the outer circumference along
2. A method according to claim 1, wherein said step (6) is formed continuously from the resin film (4), an adhesive (7) is applied to one surface of said projecting film (6), and a release film (8) is temporarily attached to the surface. Or a heat insulating pipe with a carbon heating element according to 2.