JPH0249436Y2 - - Google Patents

Description

[Detailed explanation of the idea]

This invention relates to parallel coated conduits suitable for use in piping for air conditioning and the like. Generally, parallel coated conduits are used for heating and cooling piping. Conventional parallel coated conduits of this type consist of a high-temperature conduit through which a high-temperature heat medium flows and a low-temperature conduit through which a low-temperature heat medium flows, and the whole is insulated with glass wool, rock wool, or foamed plastic. It has a structure covered with wood. However, the parallel coated conduit having such a configuration cannot be said to have a sufficient heat insulation effect, and there is a problem in that the heat loss of the heat medium flowing inside the conduit is relatively large. Furthermore, it was difficult to distinguish between the high-temperature conduit and the low-temperature conduit, and there was a risk of erroneously connecting them. This idea was made in view of the above circumstances, and the purpose is to provide parallel coated conduits that can significantly reduce heat loss of the heat medium and prevent erroneous conduit connections. shall be. In order to achieve the above object, this invention provides a first heat insulating tape with the glossy side facing outward on the outside of one of the conduits, and also provides at least one heat insulating tape on the outside of the first heat insulating tape. A sheet having a large number of independent air chambers formed to bulge out from the surface is provided, and a wavy insulating material is provided outside the other conduit. The sheet is provided between two adjacent protrusions, and a second heat insulating tape is provided with the glossy side facing inward so as to surround the entire sheet and the heat insulating material, and the outside of the second heat insulating tape is provided. The structure is such that an outer coating is provided on the outer cover. By using the sheet having a large number of independent air chambers or the corrugated heat insulating material, the contact area between the sheet and the heat insulating tape or the contact area between the insulating material and the conduit is minimized, and heat conduction is achieved. In addition to reducing the amount of heat transferred, air can be removed by forming a large number of independent air chambers between the sheet and the insulation tape, or by forming a large number of independent small chambers between the insulation material and the conduit. While suppressing convection between the chambers or compartments and reducing the amount of heat transfer due to heat convection, the first heat insulating tape with the glossy side facing outward,
Heat radiation from one of the conduits is suppressed, and the heat radiated from both conduits is reflected inward by a second heat insulating tape with the glossy side facing inward, thereby reducing the amount of heat transfer due to heat radiation. As a result, the heat insulation performance can be improved. Hereinafter, embodiments of this invention will be described with reference to FIGS. 1 to 3 attached hereto. FIGS. 1A and 1B show an example of parallel coated conduits according to this invention. In this figure, the conduits indicated by numerals 1 and 2 are arranged in parallel. These conduits 1 and 2 are made of copper, other metals, vinyl chloride, etc. In this embodiment, high-temperature water flows through one conduit 1,
Low temperature water flows through the other conduit 2. A heat insulating tape 3 having an aluminum foil 3a attached to the outer periphery is provided on the conduit 1. This heat insulating tape 3 is used to prevent the aluminum foil 3a from being heated by conduction heat when the aluminum foil 3a attached to its outer periphery is placed directly on the conduit 1, and is made of Tetron non-woven fabric, glass cloth, etc. Alternatively, materials having heat resistance and heat retention properties such as polyester are used. 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 with consideration given to reflecting radiant heat and suppressing radiation intensity 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 aluminum foil that has only one glossy surface, and especially minimize the radiation intensity. The glossy side is facing outward to ensure this. In addition, it can reflect radiant heat,
In addition, metal foil other than the aluminum foil 3a or other materials may be used as long as the radiant heat can be suppressed to a low level, and aluminum may be vapor-deposited on the heat insulating tape 3. Further, a sheet 4 having an air chamber 4a is provided on the aluminum foil 3a. This sheet 4 is
In this case, two films made of transparent plastic or the like are pasted together, and a part of one film is bulged away from the other film to create a number of independent air chambers between the two films. 4a, and is provided with the side where the air chamber 4a bulges facing inward. Note that the air chamber 4a may be provided with the bulging side facing outward, or the air chamber 4a may be bulged from both sides of the sheet 4. Furthermore, air chamber 4
The cross-sectional shape of a may be circular, square, rhombic, or any other arbitrary shape. On the other hand, a heat insulating material 5 is provided on the conduit 2. The heat insulating material 5 is made of heat-resistant polyethylene or the like, and its peripheral wall has a wavy shape 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. Then, a heat insulating tape 6 to which aluminum foil 6a is attached is provided so as to surround the conduit 1, the heat insulating tape 3, the aluminum foil 3a, and the sheet 4 configured as described above, as well as the whole conduit 2 and the heat insulating material 5. . The insulation tape 6 and aluminum foil 6a differ from the aforementioned insulation tape 3 and aluminum foil 3a in that the aluminum foil 6a is attached to the inner periphery of the insulation tape 6 with its shiny side facing inward, but the other structures are the same. It's getting old. Furthermore, an outer covering 7 is provided on the outside of the heat insulating tape 6. The outer covering 7 is intended to further enhance the heat insulation effect and protect the inner covering part, and is made of a polyethylene flat tube and is placed at appropriate locations between it and the heat insulating tape 6. A gap 8 is formed between the heat insulating tape 6 and the heat insulating tape 6 by interposing a spacer (not shown). Further, an annular groove 7a is formed on the outer periphery of the outer sheath 7, so that the strength of the outer sheath 7 against external pressure is hardly impaired.
Bending of parallel coated conduits can now be easily performed. In the parallel coated conduit constructed as described above, since the air chamber 4a is formed on the inner periphery of the sheet 4 and bulges out from the inner periphery, the sheet 4 comes into contact with the aluminum foil 3a because of the air. Only the top of chamber 4a. Therefore, the heat transfer area of the sheet 4 can be reduced, and the amount of heat transferred by thermal conduction can be reduced. Moreover, there is much more air in the air chamber 4a and between the sheet 4 and the aluminum foil 3a than the volume of the sheet 4. This air is a poor conductor of heat. Therefore, the amount of heat conducted by thermal conduction can be further reduced. Furthermore, since the air chambers 4a are independent from each other,
The air within each air chamber 4a does not circulate among each other due to convection. Moreover, sheet 4 and aluminum foil 3
Since the air existing between the air chamber 4a and the air chamber 4a is prevented from moving, no convection occurs in the air. Therefore, the amount of heat transferred by convection can be minimized. By being able to reduce the amount of heat transferred by heat transfer and heat convection, the heat loss chamber of the high temperature water flowing inside the conduit 1 can be significantly reduced. On the other hand, the conduit 2 is not covered with a mere heat insulating material, but is covered with a liquid heat insulating material 5. Since the insulation material 5 is corrugated, only a part of it contacts the conduit 2. Therefore, the amount of heat transferred by thermal conduction can be reduced. In addition, since the heat insulating material 5 has a wavy shape, there is a gap between the heat insulating material 5 and the conduit 2.
A large number of independent cells are formed. 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 by heat conduction and thermal convection, heat loss of low-temperature water flowing in the conduit 2 (in this case, low-temperature water is heated by external heat) can be reduced. can be significantly reduced. In addition, a heat insulating tape 3 with aluminum foil 3a attached to the outer periphery is provided on the outside of the conduit 1, so that heat radiated from the conduit 1 is suppressed and the entire sheet 14 and heat insulating material 5 are so as to surround the
Since the heat insulating tape 6 with aluminum foil 6a attached to the inner circumference is provided, the heat radiated from both conduits 1 and 2 is reflected inward by the aluminum foil 6a, thereby reducing the amount of heat transfer due to heat radiation. can do. Incidentally, since heat transfer between the conduit 1 and the conduit 2 is carried out via the sheet 4 and the heat insulating material 5, it goes without saying that the amount of heat transfer can be minimized. Furthermore, since the conduit 1 and the conduit 2 have different covering structures, the conduit 1 and the conduit 2 can be distinguished by their covering structures.
Therefore, incorrect connection of the conduit 1 and the conduit 2 can be prevented. Furthermore, since it is a combination of the wavy heat insulating material 5 and the sheet 4 having a large number of independent air chambers 4a, the sheet 4 having a circular cross section is formed at the contact area between the two, as shown in FIG. 1B. 4 is stably supported between two adjacent protrusions of the wavy heat insulating material 5, and during manufacturing etc.
It is easy to wrap the heat insulating tape 6. In order to confirm the effect of this invention in reducing heat loss, a thermal efficiency test was conducted between a conventional product and a parallel coated conduit having the above configuration. According to the tests, as shown in the table below, this invented product was able to improve thermal efficiency by 40% compared to conventional products. In this test, a conventional product in which two conduits were covered with foamed polyethylene was used. Furthermore, it goes without saying that the dimensions of the two conduits, the distance between their axes, the cross-sectional dimensions of the entire parallel coated conduit, etc. are the same between the conventional product and the product related to this invention. The test results are as follows.

[Table] Next, another embodiment of this invention will be described with reference to FIGS. 2 and 3. In these figures, the same parts as in the above embodiment are given the same reference numerals, and the explanation thereof will be omitted. In the parallel coated conduit shown in FIG. 2, the outer periphery of the outer sheath 7 is simply a smooth surface. In addition, the parallel coated conduit shown in FIG. 3 has a large number of protrusions 7b extending in the axial direction formed adjacent to each other in the circumferential direction on the inner periphery of the outer sheath 7, and a so-called knurled conduit on the outer periphery. It has unevenness formed thereon. In this case, the contact area between the outer covering 7 and the heat insulating tape 6 can be reduced, thereby further reducing heat loss.
In addition, in order to obtain such an effect, the protrusion may be formed in an annular shape. Further, by forming irregularities on the outer periphery, wrinkles and the like occurring on the outer periphery of the outer covering 7 can be made less noticeable, thereby improving the aesthetic appearance. Note that the heat insulating material 5 may be provided on the conduit 2 via aluminum foil and heat insulating tape. As explained above, the parallel coated conduit of this invention is provided with a first heat insulating tape with the glossy side facing outward on the outside of one of the conduits, and at least A sheet having a large number of mutually independent air chambers bulging from one side is provided, and a wavy insulation material is provided outside the other conduit, and this wavy insulation material is provided. The sheet is provided between two adjacent protrusions, and a second heat insulating tape is provided with the glossy side facing inward so as to surround the entire sheet and the heat insulating material, and the second heat insulating tape is Since the structure is such that the outer covering is provided on the outside, the sheet having a large number of independent air chambers or the corrugated heat insulating material can be used to prevent contact between the sheet and the heat insulating tape or between the heat insulating material and the conduit. In addition to reducing the amount of heat transferred by thermal conduction by minimizing the number of contact areas, a large number of independent air chambers are formed between the sheet and the insulation tape, or a large number of air chambers are formed between the insulation material and the conduit. By forming independent chambers, convection between the air chambers or chambers is suppressed and the amount of heat transfer due to heat convection is reduced. The amount of heat transferred by heat radiation is reduced by suppressing the radiation of heat from the pipes and reflecting the heat radiated from both conduits inward by the second heat insulating tape with the glossy side facing inward. As a result, it is possible not only to improve the insulation performance, but also to significantly reduce the heat loss of the heating medium, to prevent incorrect connection of conduits, and to improve the insulation performance of the wavy insulation material. By being able to stably support the sheet between two adjacent protrusions, both conduits do not shift and move when wrapping the second heat insulating tape during manufacturing, etc., ensuring that the second When winding the second heat insulating tape, both conduits do not shift and move, and the second heat insulating tape can be reliably wrapped.

[Brief explanation of the drawing]

The attached FIGS. 1 to 3 each show an embodiment 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, 2... Conduit, 3... First insulation tape, 3
a... Aluminum foil (glossy side), 4... Sheet, 4a
...Air chamber, 5...Insulating material, 6...Second heat insulating tape, 6a...Aluminum foil (glossy surface), 7...Outer coating.

Claims (1)

[Scope of utility model registration request] A coated conduit in which two conduits through which a heat medium flows are arranged in parallel, and a first heat insulating tape with the glossy side facing outward is provided outside one of the conduits, and this first A sheet having a large number of mutually independent air chambers bulging out from at least one surface is provided on the outside of the heat insulating tape, and a wavy heat insulating material is provided on the outside of the other conduit. At the same time, the sheet is provided between two adjacent protrusions of the wavy heat insulating material, and a second heat insulating tape with the glossy side facing inward is provided so as to surround the entire sheet and the heat insulating material. a parallel coated conduit, characterized in that the parallel coated conduit is provided with an outer coating on the outside of the second insulating tape.