JPH0338556Y2 - - Google Patents

Description

[Detailed explanation of the idea]

This invention relates to a coated conduit that has low heat loss and is suitable for use as piping for heating and cooling systems. Generally, coated conduits are used for heating and cooling piping. Conventional coated conduits of this type are constructed by covering the conduit with a heat insulating material such as glass wool, rock wool, or foamed plastic. However, the coated conduit having such a structure cannot be said to have a sufficient heat insulating effect, and there is a problem in that the heat loss of the heat medium flowing inside the conduit is relatively large. This invention was made in view of the above circumstances, and aims to provide a coated conduit that can significantly reduce heat loss of the heat medium flowing inside the conduit. In order to achieve the above objective, this invention provides a corrugated heat insulating material around the outer periphery of the conduit through which the heat medium flows, and a metallic glossy surface with low emissivity is formed on the outer periphery of this heat insulating material. A heat insulating tape is provided with the shiny metallic surface facing inward, an outer covering is provided on the outside of the heat insulating tape, and a gap is provided between the heat insulating tape and the outer covering. It is. Then, by using the above-mentioned corrugated heat insulating material, the contact area between the heat insulating material and the conduit and the heat insulating tape is minimized, and the gap between the heat insulating tape and the outer covering is used to reduce the contact area between the heat insulating tape and the outer covering. In addition to suppressing contact and reducing the amount of heat transferred by thermal conduction, convection between the cells is suppressed by forming a large number of independent cells between the insulation tape and the insulation material, and between the insulation material and the conduit. This reduces the amount of heat transferred by heat convection, while directing the metallic glossy surface of the heat insulating tape, which has a metallic glossy surface with a low emissivity formed on its surface, inward to reduce the amount of heat radiated from the conduit. By reflecting and reducing the amount of heat transfer due to thermal radiation, the insulation performance is improved. Below is the first attached example of this invention.
This will be explained with reference to FIGS. FIGS. 1A and 1B show an example of a coated conduit according to this invention. In this figure, the symbol 1
is a conduit. This conduit 1 is made of copper or other metal,
Alternatively, it is made of vinyl chloride or the like, and a heat medium such as high-temperature water or low-temperature water flows inside it. In this embodiment, hot water flows through the conduit 1. A heat insulating material 2 is provided on the conduit 1 . The heat insulating material 2 is made of heat-resistant polyethylene or the like, and has wavy square walls in a cross section perpendicular to the axis. Note that the peripheral wall may be formed to have a wavy shape in the axial cross section. Also, on the cross-sectional material 2, there is a glossy aluminum foil 3 on the surface.
A heat insulating tape 3 to which a is attached is provided.
The heat insulating tape 3 is made of Tetron nonwoven fabric, glass cloth, polyester, or the like, which has heat resistance and heat retention properties. Note that materials other than heat insulating tape may be used as long as they have such properties. Further, the aluminum foil 3a is provided on the surface of the heat insulating tape in consideration of reflecting radiant heat and keeping the emissivity as low as possible. Therefore, it is desirable to use aluminum foil 3a that has glossy surfaces on both sides, but in this case, use a commercially available heat insulating tape that has only one side of the aluminum foil that is glossy. In particular, the glossy surface faces inward to reflect radiant heat from the inside. Note that any metal foil other than the aluminum foil 3a may be used as long as it can reflect radiant heat and keep the emissivity low.
Other low emissivity metallic glossy surfaces may be formed, or the heat insulating tape may be vapor deposited with aluminum. Further, an outer covering 4 is provided on the outside of the heat insulating tape 3. This outer covering 4 is intended to further enhance the heat insulating effect and protect the inner part of the covering, and is made of polyester resin or the like that has both heat insulating properties and strength. A gap 5 is formed between the heat insulating tape 3 and the heat insulating tape 3 by interposing a spacer (not shown) at an appropriate location between the heat insulating tape 3 and the heat insulating tape 3. In the coated conduit having the above structure, since the heat insulating material 2 covering the conduit 1 is wavy, only a part of the heat insulating material 2 comes into contact with the conduit 1 and the heat insulating tape 3, and the heat insulating tape 3 Since the gap 5 is formed between the heat insulating tape 3 and the outer sheath 4, contact between the heat insulating tape 3 and the outer sheath 4 is suppressed.
Therefore, the amount of heat transferred by thermal conduction can be reduced. Further, since the heat insulating material 2 has a wavy shape, a large number of independent small chambers are formed between the heat insulating material 2 and the conduit 1 and between the heat insulating material 2 and the heat insulating tape 3. Since the chambers are independent from each other, the air existing inside the chambers does not cause convection between the chambers. Therefore, the amount of heat transferred by thermal convection can be reduced. By reducing the amount of heat transferred through heat conduction and heat convection, the heat loss of the high-temperature water flowing through the conduit 1 can be significantly reduced. Moreover, insulation material 2
Since a heat insulating tape 3 with glossy aluminum foil 3a attached to the surface is provided around the outer periphery of the conduit 1, the heat radiated from the conduit 1 is reflected by the glossy aluminum foil 3a, thereby reducing the amount of heat transfer due to thermal radiation. can be reduced. Next, another embodiment of this invention will be described with reference to FIGS. 2 to 4. In these figures, the same parts as in the above embodiment are given the same reference numerals, and the explanation thereof will be omitted. The coated conduit shown in FIG.
This makes it possible to easily bend the coated conduit without compromising its strength against external pressure. In addition, the coated conduit shown in FIG. 3 has so-called knurling-like unevenness formed on the outer periphery of the outer sheath 4 to make wrinkles on the surface of the outer sheath 4 less noticeable and to improve the aesthetic appearance. With,
A protrusion 4b is formed on the inner periphery of the outer covering 4 and extends in the axial direction. Furthermore, the coated conduit shown in FIG. 4 is a so-called parallel coated conduit in which two conduits 1, 1 are arranged side by side.
A conduit 1 through which high-temperature water flows is covered with a wavy heat insulating material 2 and a heat insulating tape 3 with aluminum foil 3a attached to the inner periphery, while a conduit 1 through which low-temperature water flows is covered with a wavy heat insulating material 2. The entire structure is covered with a heat insulating tape 6 having an aluminum foil 6a attached to the inner periphery, and an outer covering 4 is provided on the outside thereof. A thermal efficiency test was conducted on the parallel coated conduit constructed in this way and the conventional parallel coated conduit, and as shown in the table below, this product was able to improve thermal efficiency by 35% compared to the conventional product. did it. In addition,
In the test, two conduits covered with foamed polyethylene were used as a conventional product, and the dimensions of the two conduits, the distance between the axes, and the cross-sectional dimension of the entire parallel covered conduit were compared between the conventional product and this invention. Of course, the same was done for all related matters. The test results are as follows.

[Table] As explained above, according to the coated conduit of this invention, a corrugated heat insulating material is provided on the outer periphery of the conduit through which the heat medium flows, and the outer periphery of this heat insulating material is
A heat insulating tape having a low emissivity metallic glossy surface formed on the surface is provided so that the metallic shiny surface faces inward, an outer coating is provided on the outside of the heat insulating tape, and the heat insulating tape and the outer coating are connected. Since the structure has a gap between the insulation tape and the insulation tape, the corrugated insulation material minimizes the contact area between the insulation material and the conduit and the insulation tape, and also reduces the gap between the insulation tape and the external covering. This suppresses contact between the insulation tape and the external covering, reducing the amount of heat transferred by thermal conduction, and also forms a number of independent small chambers between the insulation tape and the insulation material, and between the insulation material and the conduit. By doing so, convection between the chambers is suppressed and the amount of heat transfer due to heat convection is reduced. On the other hand, by directing the metallic shiny surface of the insulation tape, which has a metallic shiny surface with a low emissivity, facing inward, By reflecting the heat radiated from the conduit inward and reducing the amount of heat transfer due to thermal radiation, it is possible to improve the insulation performance, and it is possible to significantly reduce the heat loss of the heat medium. Due to the gap formed between the outer covering and the heat insulating tape, the outer covering can be easily removed and the cross-sectional tape, heat insulating material, etc. will not be damaged. It will be done.

[Brief explanation of the drawing]

The attached FIGS. 1 to 4 each show a connecting portion of this invention, and FIG. A is a partially cutaway side view thereof, and FIG. B is a sectional view taken along the line X--X of FIG. A. 1...Conduit, 2...Insulating material, 3, 6...Insulating tape, 3a, 6a...Glossy aluminum foil (metallic gloss surface), 4...Outer coating, 5...Gap.

Claims (1)

[Scope of utility model registration request] A corrugated heat insulating material is provided around the outer circumference of the conduit through which the heat medium flows, and a heat insulating tape with a low emissivity metallic glossy surface formed on the surface is placed around the outer circumference of the heat insulating material, and the metallic luster surface is on the inside. 1. A coated conduit, characterized in that it is provided so as to be oriented towards the heat insulating tape, an outer sheath is provided on the outside of the heat insulating tape, and a gap is provided between the heat insulating tape and the outer sheath.