JPH0331130B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coated conduit in which the outer periphery of the conduit is coated with a heat insulating material.

Generally, coated conduits are used for heating and cooling piping. Conventionally, coated conduits of this type have been constructed by covering the conduit with an 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. Furthermore, it was troublesome to cover the conduit with a heat insulating material.

This invention was made in view of the above circumstances, and an object of the present invention is to provide a coated conduit that can significantly reduce heat loss of the heat medium, and in which the conduit can be easily covered with a heat insulating material. do.

In order to achieve this object, the present invention is characterized in that a band-shaped heat insulating material having a plurality of mutually independent air chambers is spirally wrapped around the outer periphery of the conduit.

Hereinafter, the present invention will be explained with reference to illustrated embodiments.

In the present invention, a band-shaped heat insulating material 2 is provided on the outer periphery of the conduit 1.
The coated conduit 3 is formed by winding it spirally.

The coated conduit 3 is used with a heat medium such as high-temperature water or low-temperature water flowing therein, and the heat insulating material 2 prevents the transfer of heat inside and outside the conduit 1. conduit 1
is made of, for example, copper or other metals or vinyl chloride, while the heat insulating material 2 is made of, for example, the first
The one shown in the figure and FIG. 2 is used.
The illustrated heat insulating material 2 consists of a band-shaped main body made by pasting together two sheets of ilms 2a and 2b made of transparent plastic or the like, and an aluminum foil 2c attached to the lower surface of the main body. A portion of the upper film 2a bulges away from the other lower film 2b, and an air chamber R is formed inside the bulge. The inner surface of the aluminum foil 2c is a glossy surface.

3 to 7 show different examples of how the band-shaped heat insulating material 2 is wound around the conduit 1 in pairs.

FIG. 3 shows a first example of the winding configuration. In this example, a coated conduit 3 is formed by tightly wrapping a heat insulating material 2 spirally around the outer peripheral portion 1a of the conduit 1 from the left side to the right side in the figure along the longitudinal direction of the conduit 1. The heat insulating material 2 in this example is wound in an S shape as indicated by the horizontal letter "S" in the figure, and the adjacent side edges of the wound material abut against each other at the outer circumference 1a of the conduit 1.
is completely covered.

FIG. 4 shows a second example of the winding configuration. In this example, a coated conduit 3 is formed by wrapping a heat insulating material 2 overlappingly around the outer peripheral portion 1a of the conduit 1 from the left side to the right side in the figure along the longitudinal direction of the conduit 1. The heat insulating material 2 in this example is also S-wound like the one in FIG. 3 described above. By overlapping the adjacent side edges of the heat insulating material 2, the outer peripheral portion 1a of the conduit 1 is completely covered without fear of forming a gap.

FIG. 5 shows a third example of the winding configuration. In this example, the coated conduit 3 is formed by arranging and simultaneously wrapping two heat insulating materials 2 in a helical manner around the outer peripheral portion 1a of the conduit 1 from the left side to the right side in the figure along the longitudinal direction of the conduit 1.
These two heat insulating materials 2 are wound in an S-wound like the one in FIG. 3 described above, and are wound in two tightly wound strips so that their mutually adjacent side edges butt against each other. According to this example, the heat insulating material 2 is wound at twice the speed as compared to the case of winding one strip as shown in FIG.

FIG. 6 shows a fourth example of the winding form. In this example, two heat insulating materials 2 are placed around the outer peripheral portion 1a of the conduit 1 from the left side to the right side in the figure along the longitudinal direction of the conduit 1.
The coated conduit 3 is formed by spirally winding two layers with a phase difference of 180°. These two heat insulating materials 2 are formed into an S-wound like the one in FIG. 3 described above, and are tightly wound so that adjacent side edges abut each other. According to this example, 1
The part where the side edges of the second layer of heat insulating material 2 abut against each other, that is, the part that becomes the spiral joint, is covered with the central part of the second layer of heat insulating material 2, thereby preventing a decrease in the heat insulation effect.

FIG. 7 shows a fifth example of the winding form. In this example, the coated conduit 3 is formed by wrapping two heat insulating materials 2 in two layers around the outer peripheral portion 1a of the conduit 1 from the left side to the right side in the figure along the longitudinal direction of the conduit 1. The first layer of heat insulating material 2 is S-wound, similar to that shown in FIG. 3, and is tightly wound so that the side edges abut each other. The second layer of heat insulating material 2 is tightly wound in a Z-wound, which is the opposite of the S-wound, as indicated by the horizontal letter "Z" in the figure, so that the side edges abut each other. By thus winding the two heat insulating materials 2 in two layers in reverse winding, the tensions of the heat insulating materials 2 act on each other to prevent them from loosening. Therefore, the heat insulating material 2 is wound in a stretched state, and a decrease in the heat insulating effect due to gaps between the wound parts is avoided.

Note that the present invention does not limit the winding form of the heat insulating material 2 to only the above-mentioned examples, and for example, it is possible to variously modify each of the above-mentioned examples.

For example, as a modification of the winding form shown in FIG. 5, three or more heat insulators 2 may be wrapped simultaneously in parallel, or sequentially after a certain period of time, or the side edges of adjacent heat insulators 2 may overlap each other. There is a form in which it is wrapped in such a way that the Variations of the winding form shown in FIG. 6 include winding three heat insulating materials 2 with a phase difference of 120 degrees, winding a plurality of heat insulating materials 2 with various phase differences, or The insulation material 2 in each layer is wound so that the side edges thereof overlap, or the insulation material 2 in each layer is wrapped so that the side edges thereof are spaced apart at a predetermined interval and the separated portions are covered with a shift for each layer. There are various forms such as wrapping. Further, as a modification of the winding form shown in FIG. 7, the heat insulating material 2 in each layer is wound so that the side edges thereof overlap;
Alternatively, three or more insulation materials 2 are alternately wound in multiple layers in S-wound and Z-wound, or the insulation materials 2 in each layer are separated from each other by a predetermined distance between their side edges, and the separated portions are shifted for each layer. There is a form in which it is wrapped so that it is covered. When the heat insulating material 2 is wound so that there is a gap between its sides, the flexibility of the conduit 1 is not impaired. Further, when the heat insulating materials 2 shown in FIGS. 1 and 2 are wound in an overlapping manner, it is preferable for the flat side portions of the heat insulating materials 2 to closely overlap each other in terms of heat insulation.

Furthermore, the heat insulating material 2 may be wound by appropriately combining each of the above examples and their modifications, and when winding a plurality of heat insulating materials 2, from one side of the conduit 1 to the other side. It may be divided into two types: one that is wrapped around the conduit 1, and one that is wrapped from the other side of the conduit 1 toward one side. In short, any form in which the heat insulating material 2 is wound spirally along the longitudinal direction of the conduit 1 is sufficient.

Further, the heat insulating material 2 may be wrapped directly around the outer circumferential portion 1a of the conduit 1, or may be indirectly wrapped around an inclusion disposed on the circumferential surface of the conduit 1. An example is shown in FIG. In this example, the heat insulating material 2 shown in FIGS. 1 and 2 is wrapped around the heat insulating tape 4 placed around the circumferential surface of the conduit 1, with the air chamber R inside. insulation tape 4
For example, aluminum foil is attached or aluminum is vapor-deposited on the outer peripheral surface of a heat-resistant and heat-retaining material such as Tetron non-woven fabric, glass cloth, or plastic fiber such as polyester. In addition, in this example, the wrapped insulation material 2
It is further covered with a heat insulating tape 5 and an outer covering 7. The heat insulating tape 5 is similar to the heat insulating tape 4, and the outer covering 7 is made of polyester or the like which has both heat insulating properties and strength. When actually manufacturing the coated conduit 3, it is more advantageous in terms of heat insulation to arrange the heat insulating tapes 4, 5 and the outer sheath 7 as in this example.

By the way, the heat insulating material 2 wrapped around the periphery of the conduit 4 in this way prevents the transfer of heat due to heat conduction, heat convection, and heat radiation, and achieves an excellent heat insulating effect as described below.

That is, the insulation material 2 and the insulation tape 4 inside it
Since the contact surface with the heat insulating material 2 is only at the top of the air chamber R, the heat transfer area is made small and the amount of heat transfer is reduced. This heat transfer is from the inside to the outside when a high temperature heat medium is passed through the conduit 1, and from the outside to the inside when a low temperature heat medium is passed through the conduit 1. . Further, there is a large amount of air within the air chamber R and between the heat insulating material 2 and the heat insulating tape 4 inside thereof, which acts as a poor heat conductor and further reduces heat transfer. In addition, since the air chambers R are independent from each other, the air in each air chamber R does not circulate through each other due to convection, and the air that exists between the heat insulating material 2 and the heat insulating tape 4 on the inside thereof is The air chamber R prevents movement and no convection occurs. Therefore, the amount of heat transferred by convection is also extremely small. Further, the aluminum foil 2c of the heat insulating material 2 suppresses heat radiation. In this example, since the inner surface of the aluminum foil 2c is a glossy surface, when a high-temperature heat medium is passed through the conduit 1, radiant heat from the conduit 1 side to the outside is radiated to the inside of the aluminum foil 2c. The transmission of the radiant heat is suppressed by being reflected by the shiny surface of the In this respect, making the films 2a and 2b transparent is extremely advantageous in terms of heat radiation.

In this embodiment, in addition to the heat insulating material 2, the heat insulating tapes 4 and 5 and the outer sheath 6 are arranged around the conduit 1, so that the heat insulating tapes 4 and 5 and the outer sheath 6 also have a heat insulating effect. Insulation tape 4, 5
Also, by making the inner surface of the aluminum foil therein a glossy surface, it is possible to expect the same reflection of radiant heat as in the above-mentioned heat insulating material 2.

By the way, in the above embodiment, the inner surface of the aluminum foil 2c in the heat insulating material 2 is made into a glossy surface, but the outer surface may be made into a shiny surface, and in that case, the radiation intensity of heat from the heat insulating material 2 to the outside can be kept low. be able to. Naturally, both the inner and outer surfaces of the aluminum foil 2c may be glossy surfaces. Further, in the heat insulating tapes 5 and 6 as well, by making the outer surface of the aluminum foil therein a glossy surface, the radiation intensity of heat to the outside can be suppressed to a low level similarly to the heat insulating material 2.

In the above embodiment, the air chamber R is provided on one side of the heat insulating material 2, but the air chamber R may be provided on both sides of the heat insulating material 2. Further, the cross-sectional shape of the air chamber R may be arbitrary, such as circular, square, or rhombic. Further, the aluminum foil 2c may be attached to the surface of the heat insulating material 2 on the air chamber R side, or may be attached to both surfaces of the heat insulating material 2.

Further, when providing the heat insulating material 2 around the conduit 1, the air chamber R may be placed outside.

Further, the heat insulating material 2 has the aluminum foil 2c together with the air chamber R, but even if it has only the air chamber R, a sufficient heat insulating effect can be achieved.

As explained above, the coated conduit according to the present invention has a structure in which a band-shaped insulating material having a plurality of mutually independent air chambers is spirally wrapped around the outer circumference of the conduit, and therefore the insulating material has excellent properties. The heat loss of the heating medium can be significantly reduced due to the heat insulation effect.
Furthermore, it is possible to easily coat the conduit with the heat insulating material.

[Brief explanation of drawings]

The drawings show embodiments of the present invention; FIG. 1 is a perspective view showing an example of the heat insulating material, FIG. 2 is a longitudinal sectional view of the heat insulating material, and FIGS. 3 to 7 show different windings of the heat insulating material. FIG. 8A is a partially cutaway perspective view of a covered conduit, and FIG. 8B is a sectional view taken along the line X--X of FIG. 8A. 1... Conduit, 2... Insulating material, 3... Covered conduit,
R...Air chamber.

Claims (1)

[Scope of Claims] 1. A coated conduit characterized in that a band-shaped heat insulating material having a plurality of mutually independent air chambers is wound spirally around the outer periphery of the conduit. 2. The coated conduit according to claim 1, wherein the band-shaped heat insulating material has aluminum foil attached to at least one of its front and back surfaces. 3. The coated conduit according to claim 1 or 2, wherein the band-shaped heat insulating material is wound helically so that its flat sides overlap. 4. The coated conduit according to claim 1 or 2, wherein the band-shaped heat insulating material is wound spirally with a gap between its side parts. 5. The coated conduit according to claim 1 or 2, wherein the band-shaped heat insulating material is wound in two or more layers in an alternating spiral shape for each layer.