JPH0368276B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a conduit whose outer periphery is covered with a heat insulating material.

[Prior art and its problems]

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.

The present invention provides a coated conduit that can significantly reduce heat loss by using an air chamber as a heat insulating layer, has a structure that can hold this air chamber, and can easily cover the conduit with a heat insulating material. is intended to provide.

[Means for solving problems]

In order to achieve the above object, the coated conduit of the present invention is a conduit whose outer periphery is covered with a band-shaped insulating material having a plurality of air chambers that are independent from each other and open at the top, the air chambers being , the heat insulating material is rigid enough not to collapse when placed over the outer periphery of the conduit, and is formed of ribs having a triangular cross section, and the heat insulating material is provided at the bottom of each of the air chambers. The present invention is characterized in that a protrusion is provided that is rigid enough not to collapse when placed over the outer periphery of the conduit.

[Effect]

The coated conduit of the present invention has an air chamber reliably present in the heat insulating material covering the outer periphery of the conduit, thereby preventing heat transfer through heat conduction and convection, thereby achieving an excellent heat insulating effect.

〔Example〕

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

In the present invention, as an example, a band-shaped heat insulating material 2 is spirally wound around the outer periphery of a conduit 1 to form a coated conduit 3.

The coated conduit 3 is used with a heat medium of 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. The conduit 1 is made of, for example, copper or other metals or vinyl chloride, while the heat insulating material 2 used is, for example, those shown in FIGS. 1 to 3. That is, the illustrated heat insulating material 2 consists of a belt-shaped main body in which a sheet-like portion 2a, ribs 2b, and protrusions 2c are integrally molded from transparent plastic or the like, and an aluminum foil 2d attached to the lower surface of this main body. Rib 2b
is provided protrudingly from the upper part of the sheet-like portion 2a, and the space surrounded by the rib 2b as a wall portion serves as an air chamber R. A large number of air chambers R are formed in a diamond shape, each of which is independent from the other and open at the top. The rib 2b has a triangular cross section as shown in FIGS. 2 and 3, and its top portion is tapered. In addition, each of the ribs 2b forming one side of the rhombic air chamber R is independent from each other, and as a result, a notch 2e of the rib 2b is formed at a location corresponding to the corner of the rhombic air chamber R. has been done. One protrusion 2c is provided at the center of the bottom of each air chamber R. This protrusion 2c
The tops of the ribs 2b are rounded and small like the tops of the ribs 2b.

By the way, the ribs 2 in such a heat insulating material 2
b and the protrusion 2c have enough rigidity to not collapse when in use with the heat insulating material 2. In other words, insulation material 2
is used in a form that is interposed between two objects that are to prevent heat transfer, and the ribs 2b and protrusions 2c maintain the formation of the air chamber R without being crushed in the usage state. It has a certain degree of rigidity. Therefore, the material and wall thickness of the ribs 2b and protrusions 2c are set according to the usage conditions of the heat insulating material 2.
Appropriate stiffness is provided.

Further, such a heat insulating material 2 is formed into a band shape whose longitudinal direction is the vertical direction in FIG. In addition, in this example, an overlap margin 2f is formed on one side in the width direction of the heat insulating material 2 (on the left side in FIG. It is designed so that no gaps or steps will be created when the Further, the inner surface of the aluminum foil 2d is a glossy surface.

4 to 8 show different examples of how the band-shaped heat insulating material 2 is wound around the conduit 1.

FIG. 4 shows a first example of the winding form. 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 made into an S winding as shown by the horizontal letter "S" in the figure, and is wound so that the adjacent side edges abut each other and completely cover the outer circumference 1a of the conduit 1. It is covered with

FIG. 5 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 made into an S volume 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. 6 shows a third example of the winding form. In this example, the coated conduit 3 is formed by wrapping two heat insulating materials side by side and simultaneously 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 two heat insulating materials 2 are wound in an S-wound similar to the one in FIG. 4 described above, and are wound in two closely spaced strips so that their mutually adjacent side edges abut 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. 7 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 winding similar to the one in FIG. 4 described above, and each is tightly wound so that adjacent side edges abut each other. According to this example, the abutting portions of the side edges of the first layer of insulation material 2,
In other words, by covering the portion that forms the spiral joint with the center portion of the second layer of heat insulating material 2, it is possible to prevent the heat insulating effect from decreasing.

FIG. 8 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 wound in an S-wound similar to that shown in FIG. 4, and is tightly wound so that the side edges abut each other. The second layer of insulation material 2 is indicated by the horizontal “Z” in the diagram.
As indicated by the letters, it is a Z winding, which is the opposite of an S winding.
It is also tightly wound so that the side edges abut each other. However, in this way, two insulation materials 2
By winding the insulation materials 2 in two layers in opposite directions, the hearing powers of the insulation materials 2 interact with 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. 6, 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. 7 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. 8, 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. Furthermore, when the heat insulating materials 2 shown in FIGS. 1 to 3 are wound in an overlapping manner, it is preferable in terms of heat insulation that the flat side portions of the insulating materials 2 closely overlap each other.

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 in which it is wound, and one in which it is wound 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.
Wrap with the air chamber R inside. The heat insulating tape 4 is made by adhering aluminum foil or vapor-depositing aluminum to the outer peripheral surface of a heat-resistant and heat-retaining material such as Tetron nonwoven fabric, glass cloth, or plastic fiber such as polyester. Further, in this example, the wrapped heat insulating material 2 is further covered with a heat insulating tape 5 and an outer covering 7. The insulation tape 5 is the insulation tape 4
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 circumference of the conduit 1 in this way is secured by the member (insulating tape 4 in the case of the embodiment shown in FIG. 9) that the upper opening of the air chamber R faces. As a result, each air chamber R becomes a space that is connected to each other in a small way by the notch 2e, but is almost independently closed. that time,
Since the ribs 2b and the protrusions 2c have sufficient rigidity to prevent crushing, the air chambers R do not deform significantly and all reliably exist as the same diamond-shaped chambers. Such a heat insulating material 2 has thermal conductivity and
It provides excellent insulation by preventing heat transfer through thermal convection and thermal radiation.

That is, the contact surface between the heat insulating material 2 and the member inside it (the heat insulating tape 4 in the case of the embodiment shown in FIG. 9) is the small top of the rib 2b on the heat insulating material 2 and the protrusion 2.
Since there is only a small top portion of c, 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. .

In addition, there is a lot of air inside the air chamber R and between the heat insulating material 2 and the heat insulating tape 4 inside it,
This acts as a poor conductor of heat, further reducing 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. By the way, when the air chamber R in the heat insulating material 2 is formed as a sealed air chamber by a polyethylene film with a thickness of about 200μ, that is, in the case where the air chamber R in the heat insulating material 2 used in this invention is formed as a sealed air chamber. If a sealed air chamber is formed in advance from a material with weak strength, the air chamber is likely to deform and collapse due to static loads when it is used wrapped around the conduit 1, and the air inside may come off. In addition, when mass producing the conduit 1 wrapped with a heat insulating material having such a sealed air chamber,
When the conduit 1 wrapped with the insulation material is passed between feed rollers and guide rollers on a mass production line, the sealed air chamber is likely to collapse, and the air inside may escape, causing the initial insulation effect to be lost. There is a risk that it will disappear. In this respect, the air chamber R of the heat insulating material 2 used in the present invention has an upper opening type, the ribs 2b forming the air chamber R are given a predetermined rigidity, and the air chamber R It is effective that the protrusion 2c having a predetermined rigidity is provided on the bottom of the holder.

Further, the aluminum foil 2d of the heat insulating material 2 suppresses heat radiation. In this example, since the inner surface of the aluminum foil 2d 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 2d. The transmission of the radiant heat is suppressed by being reflected by the shiny surface of the In this respect, it is extremely advantageous to make the sheet-like portion 2a and the ribs 2b transparent in terms of heat radiation.

Furthermore, in the embodiment shown in FIG. 9, insulating tapes 4, 5 and outer covering 6 are arranged around conduit 1 together with such insulating material 2, so that these insulating tapes 4,
5 and the outer covering 6 also provide a heat insulating effect. In the heat insulating tapes 4 and 5 as well, 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 2d 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 2d 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, and the band-shaped main body of the heat insulating material 2 may be integrally molded. It is not limited to a product, and may be a joined structure of multiple members. Further, the cross-sectional shape of the air chambers R may be arbitrary, such as circular or square, and the arrangement form of the air chambers R may be arbitrary, such as regularly scattered in a staggered manner or irregularly scattered. Further, the aluminum foil 2d 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, the cross-sectional shape of the rib 2b forming the air chamber R, the shape and number of the protrusions 2c, etc. are arbitrary, and the notch 2e does not need to be provided.

Furthermore, when providing the heat insulating material 2 around the conduit 1, the air chamber R may be placed on the outside, or the heat insulating material 2 may be placed over the conduit 1 vertically.

Furthermore, although the heat insulating material 2 has the aluminum foil 2d together with the air chamber R, it can also have a sufficient heat insulating effect even if it has only the air chamber R.

〔Effect of the invention〕

As explained above, the coated conduit according to the present invention has a structure in which the outer periphery of the conduit is spirally covered with a band-shaped heat insulating material having a plurality of air chambers that are independent from each other and open at the top. Due to the excellent heat insulating effect of the heat insulating material, the heat loss of the heat medium can be significantly reduced, and the conduit can be easily coated with the heat insulating material.

Moreover, each air chamber of the heat insulating material is formed of ribs that are rigid enough not to collapse when the heat insulating material is placed over the outer circumference of the conduit, and at the bottom of each air chamber, the heat insulating material is Since we have provided a protrusion that is rigid enough not to collapse when covered with the outer periphery, it is ensured that each air chamber has the same shape and that the covered conduit reliably performs the intended heat insulation effect. In this case, the only contact surfaces between the heat insulating material and the inner member are the tops of the ribs with triangular cross sections and the small tops of the protrusions, so the heat transfer area can be reduced and the amount of heat transferred can be reduced.

[Brief explanation of drawings]

The drawings show embodiments of the present invention, and FIG. 1 is a plan view showing an example of the heat insulating material, and FIG.
3 is an enlarged sectional view taken along the - line in FIG. 1, FIGS. 4 to 8 are explanatory diagrams of different winding forms of the heat insulating material, and FIG. 9A is a covered conduit. A partially cutaway perspective view of Figure 9B is the same as Figure A.
FIG. 1... Conduit, 2... Insulating material, 2b... Rib, 2
e...Protrusion, 3...Coated conduit, R...Air chamber.

Claims (1)

[Scope of Claims] 1. A conduit whose outer periphery is covered with a band-shaped heat insulating material having a plurality of air chambers that are mutually independent and open at the top, each of the air chambers having a It is formed of ribs having a triangular cross section and has enough rigidity to not collapse when placed over the outer periphery of the conduit, and the heat insulating material is placed on the outer periphery of the conduit at the bottom of each of the air chambers. 1. A covered conduit characterized by being provided with a protrusion that is rigid enough not to collapse when it is covered. 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 in a spiral manner with a space between the side portions thereof. 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.