JP2004060847A - Heating/heat-insulating piping - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide heating/heat-insulating piping which is easy to construct in a small space and has excellent flexibility. <P>SOLUTION: A plurality of heat insulating materials composed of long materials having substantially circular or polygonal cross sections with a heat insulating characteristic is laid along a soaking layer 3, and the plurality of heat insulating materials covers nearly the entire periphery of the soaking layer 3. It is desirable that the heat insulating materials are spirally wrapped around the soaking layer 3, and that the number of heat insulating materials laid along the soaking layer 3 is four or more. The materials of the heat insulating materials are urethane, silicone or polyethylene. It is also desirable that the diameter of a heat insulating material is composed to be about 4-10mm, and that a helical pitch of the heat insulating materials wrapped around the soaking layer 3 is set at 250mm or more. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating and heat retaining pipe for transferring a gas and a liquid while heating and keeping the temperature.
[0002]
[Prior art]
Heating and heat retaining pipes are generally provided with a soaking layer on the outer periphery of a resin conduit along which an electric heater is laid, and about 4 to 5 layers of tape-shaped glass fiber are spirally wound from above. A heat insulating layer is formed. Further, a protective cover made of PVC is provided thereon for the purpose of protecting and waterproofing the product.
[0003]
However, the above-mentioned heating and heat retaining pipe has a problem in that it has poor flexibility and it is difficult to bend the pipe in a narrow place to construct the pipe.
[0004]
Therefore, in the industry dealing with heating and heat-retaining pipes, there is a long-awaited need to develop a flexible heating and heat-retaining pipe that can be easily installed in a narrow place.
[0005]
[Problems to be solved by the invention]
In view of the above, an object of the present invention is to provide a flexible heating and heat-retaining pipe that is easy to perform in a narrow place.
[0006]
[Means for Solving the Problems]
(Invention of claim 1)
The heat insulation pipe according to the present invention has a plurality of heat insulation materials having a heat insulation property and a long section having a substantially circular or polygonal cross section arranged along the heat equalizing layer. Cover almost the entire circumference of the soaking layer.
(Invention of claim 2)
The heating and heat retaining pipe according to the present invention relates to the above-described first aspect, wherein the heat retaining material is spirally wound on the heat equalizing layer.
(Invention of claim 3)
The heating and heat-retaining pipe according to the present invention relates to the invention described in claim 1 or 2, wherein four or more heat-insulating materials are provided along the soaking layer.
(Invention of Claim 4)
In the heating and heat-retaining pipe according to the present invention, the material of the heat-retaining material is urethane, silicon or polyethylene.
[0007]
The function of the heat insulation pipe of the present invention will be described in the following embodiments of the present invention.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
A heat insulation pipe according to an embodiment of the present invention will be described with reference to the drawings.
[Embodiment 1]
FIG. 1 is a schematic diagram of a heating and heat retaining pipe H according to an embodiment of the present invention.
(About the basic structure of this heating insulation pipe H)
As shown in FIG. 1, a heating and heat retaining pipe H of this embodiment is provided with a heat equalizing layer 3 on the outer periphery of a conduit 1 along which an electric heater 2 extends, and is formed of a long object having a substantially circular cross section from above. Five heat insulating materials 4 are spirally wound, and a moisture-proof layer 5 and a protective cover 6 are sequentially provided thereon.
[0009]
The conduit 1 transfers gas and liquid, and is made of resin (for example, PFA) or metal.
[0010]
The electric heater 2 is a cord heater, and the cord heater uses a nichrome wire covered with a glass braid.
[0011]
The heat equalizing layer 3 is for uniformly distributing the heat from the cord heater over the entire circumference of the conduit 1, and uses a tape-like laminate made of aluminum sheet and glass cloth sheet.
[0012]
The heat retaining material 4 is formed in a substantially circular shape having a diameter of about 10 mm, and a helical pitch wound around the heat equalizing layer 3 is set to about 300 mm. In this embodiment, five heat insulating materials 4 are wound around the soaking layer 3.
[0013]
The moisture-proof layer 5 is formed by spirally winding a polyester tape.
[0014]
The protective cover 6 is provided for the purpose of protecting and waterproofing the product, and is formed of a pipe made of low-hardness PVC (a PVC whose hardness is about 20% lower than that of the related art).
(About the function of this heating and heat retaining pipe H)
Since the above-mentioned configuration in which the flexibility of the piping is reduced is employed in the heating and heat retaining pipe H, the following functions are provided.
A. In this heating insulation pipe H, (1) a conventional hard insulation layer formed by tightly winding about 4 to 5 layers of tape-shaped glass fibers in a spiral manner with a heat insulation material 4 made of substantially circular urethane foam. (2) Because the protective cover made of hard PVC is changed to a protective cover made of low-hardness PVC (PVC whose hardness is about 20% lower than the conventional one), The heat insulation pipe H is very flexible.
[0015]
Therefore, when the heat insulation pipe H is used, the pipe construction in a narrow place becomes easy, and the bent pipe state can be maintained in a stable state.
B. Since the heat insulating material 4 is spirally wound around the heat equalizing layer 3, even when the pipe is bent, the heat insulating material 4 is less likely to be biased. Therefore, the heat insulating material 4 is present around the heat equalizing layer 3 on average, and stable heating and heat insulating of the fluid can be achieved.
(Other embodiments)
In the first embodiment, the cross-sectional shape of the heat insulating material 4 is substantially circular, but is not limited thereto, and the cross-sectional shape may be a polygonal shape close to a circle.
[0016]
In the first embodiment, the heat retaining material 4 is made of urethane foam, but is not limited to this, and may be made of foamed silicone, foamed polyethylene, or the like.
[0017]
In the first embodiment, the diameter of the heat insulating material 4 is about 10 mm. However, the present invention is not limited to this, and may be used as long as it is in the range of 4 to 20 mm.
[0018]
In the first embodiment, the spiral pitch wound around the heat equalizing layer 3 is set to about 300 mm. However, the present invention is not limited to this, and the spiral pitch may be 250 mm or more.
[0019]
In the first embodiment, the number of the heat insulating materials 4 wound around the heat equalizing layer 3 is five. However, the number is not limited to this and may be four or more. In short, it is only necessary that a plurality of heat insulating materials 4 can cover almost the entire circumference of the soaking layer.
[0020]
【The invention's effect】
The present invention has the following effects because it has the above configuration.
[0021]
From the contents described in the section of the embodiment of the present invention, it was possible to provide a heating and heat-retaining pipe which is excellent in flexibility and easy to perform piping in a narrow place.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a heating and heat retaining pipe according to a first embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Conduit 2 Electric heater 3 Soaking layer 4 Heat insulating material 5 Moistureproof layer 6 Protective cover

Claims (4)

A plurality of heat insulating materials having a heat insulating property and having a substantially circular or polygonal cross section are arranged along the heat equalizing layer, and the plurality of heat insulating materials substantially surround the entire heat equalizing layer. A heat-insulating pipe characterized by being covered. The heat insulation pipe according to claim 1, wherein the heat insulation material is spirally wound on the heat equalizing layer. The heat insulation pipe according to claim 1, wherein the number of heat insulation materials provided along the soaking layer is four or more. The heat insulation pipe according to any one of claims 1 to 3, wherein the heat insulation material is urethane, silicon or polyethylene.

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