JP2023019270A - Heat pipe and manufacturing method thereof - Google Patents

Abstract

To provide a heat pipe capable of efficiently and rapidly heating a fluid in a pipe by solving problems such as needing a time more than necessary for rapidly elevating a temperature of the fluid in the pipe to a desired temperature.SOLUTION: A heat pipe has a pipe body 12 and a tubular heat generation layer 13 fastened to an inner surface of the pipe body 12, wherein the heat generation layer 13 includes heat-resistant insulating layers (16, 17) fastened to the inner surface of the pipe body 12, and a heat generating member 18 arranged inside the heat-resistant insulating layers (16, 17) and generating heat upon electrification.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD The present invention relates to a heat tube having a heat generating layer and a manufacturing method thereof.

BACKGROUND ART Conventionally, a pipe heater described in Patent Document 1 is known. This pipe heater has a tubular heat insulating layer portion and a tubular heat generating portion provided inside the heat insulating layer portion. After the piping is covered so as to take the piping inside, an electric current is passed through the heating wire installed inside the heating layer to heat the piping. As a result, for example, by heating the pipes of the semiconductor equipment, it is possible to prevent deposits remaining on the inner walls from adhering. Moreover, freezing can be prevented by heating water pipes or the like.

JP 2016-99005 A

However, in the above pipe heater, the heat generated by the heating layer heats the fluid in the pipe through the pipe, so there is a problem that the fluid in the pipe cannot be easily heated quickly. In addition, if there is a projecting part such as a joint in the middle of the pipe, a gap will occur between the heating layer of the pipe heater and the pipe, and the heating of the pipe will be insufficient. It may take more time than necessary to quickly raise the temperature to .

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and provides a heat pipe capable of efficiently and quickly heating a fluid in the pipe, and a method of manufacturing the same.

In order to solve the above problems, a heat tube according to the present invention has a tube body and a tubular heat-generating layer fixed to the inner surface of the tube body, and the heat-generating layer is attached to the inner surface of the tube body. It has a structure including a fixed heat-resistant insulating layer and a heat-generating member disposed in the heat-resistant insulating layer and generating heat when energized.

According to such a configuration, since the heat pipe is provided in the pipe body, the heat generation layer can directly heat the fluid flowing through the pipe body. can be heated well.

In the heat pipe according to the present invention, the heat-resistant insulating layer has a first fibrous layer containing a cured resin and a second fibrous layer containing a cured resin, and the heat-generating member comprises the first fibrous layer containing a cured resin. It can be configured in two fibrous layers.

According to such a configuration, the heat generating layer having the first fibrous layer and the second fibrous layer is integrally fixed to the pipe main body by the cured resin, and the second fibrous layer is provided with the heat generating layer. The heat generating member provided can heat the fluid in the pipe body. The first fibrous layer on the inner surface side of the pipe body is a heat-resistant insulating layer and has a role as a heat insulating layer, and the second fibrous layer on the fluid side to be heated is a heat-resistant insulating layer and generates heat. It has a role as a waterproof layer (water resistant layer) for the member. The cured resin is a curable resin that is impregnated in the first fibrous layer and the second fibrous layer in advance and is cured by thermal energy or light energy (for example, ultraviolet rays). The heat generating layer comprising the first fibrous layer and the second fibrous layer is integrally attached to the tube body.

In the heat tube according to the present invention, the heat generating member may have a planar heat generating element.

According to such a configuration, the heat generating member, such as a metal foil, which is a planar heat generating member, is thin and flexible, and is therefore more suitable for a tubular heat pipe. As the metal foil, one made of stainless steel, aluminum, or the like is used. In addition, it is preferable to attach an insulating film to the metal foil or the like or apply a coating for insulation. As the insulating film, polyester film, polyimide film, mica (mica) film, etc. are used, but polyimide film is preferable because of its excellent heat resistance. As the insulating coating, it is preferable to form a film with a fluorine glass coating material.

In the heat tube according to the present invention, the tube main body can be configured to be a tubular body through which a fluid flows.

According to such a configuration, it is possible to heat the fluid flowing through the pipe main body, for example, to prevent freezing of water supply in cold regions, industrial water, prevention of deposits in pipes in factory equipment, etc. can be done. The pipe body may be either a new pipe or an existing pipe.

In the heat tube according to the present invention, the tube main body may be a tubular body with one end closed.

According to such a structure, one end of the pipe body is closed, so that the fluid stored as a container can be heated and kept warm. can do.

Furthermore, a method for manufacturing a heat tube according to the present invention includes a first step of forming a heat generating laminate in which a first fibrous mat and a second fibrous mat provided with a heat generating member are laminated in this order; a second step of forming a tubular heat-generating laminate impregnated with a curable resin from the heat-generating laminate; a third step of inserting the tubular heat-generating laminate into the pipe main body; a fourth step of radially expanding within the pipe body; and a fifth step of forming a tubular heat generating layer.

According to such a configuration, the tubular heat-generating laminated body is radially expanded within the pipe body, and the impregnated curable resin is cured and adhered to the inner surface of the pipe body, so that the pipe body is circulated. Heat tubes can be manufactured that can directly heat fluids.

In the method for manufacturing a heat tube according to the present invention, the tubular heat generating laminate may be formed by sewing the heat generating laminate into a tubular shape.

Further, in the method of manufacturing a heat tube according to the present invention, the tubular heat generating laminate may be radially expanded within the tube main body by supplying a fluid to the tubular heat generating laminate.

According to the present invention, the heating layer directly heats the fluid flowing through the pipe body, so that the heating can be performed quickly and efficiently.

1A is a front view of a heat tube according to an embodiment of the invention; FIG. FIG. 1B is a YY cross-sectional view of FIG. 1A. FIG. 2 is a schematic diagram showing a flattened cross section of the heat tube according to the embodiment of the present invention. FIG. 3 is a schematic cutaway perspective view of a heat tube according to an embodiment of the present invention, with a partial cutout. FIG. 4A shows a step of laminating a first fibrous mat and a second fibrous mat including a heat generating member in this order to form a heat generating laminate, which is included in the method of manufacturing a heat tube according to an embodiment of the present invention. It is a perspective view (part 1). FIG. 4B is a perspective view showing a step of forming a tubular heat-generating laminate from a heat-generating laminate, which is included in the method of manufacturing a heat tube according to the embodiment of the present invention (No. 2). FIG. 4C is a perspective view showing a step of inserting the tubular heat-generating laminate into the tube main body, which is included in the method of manufacturing the heat tube according to the embodiment of the present invention (No. 3). FIG. 5 is an exploded perspective view showing a modification of the heating element in the heat tube according to the embodiment of the invention. FIG. 6 is a schematic diagram of forming a heat pipe by inserting a tubular heat-generating laminate (lining material) into an existing pipe (pipe body). FIG. 7 is a schematic diagram of forming a heat pipe by inverting and inserting a tubular heat-generating laminate (lining material) into an existing pipe (pipe body). FIG. 8A is a perspective view schematically showing a heat tube according to another embodiment of the invention. FIG. 8B is a variation of the heat tube shown in FIG. 8A. FIG. 9A is a sectional view of a heat panel (heat sheet) to which the laminate structure of the heat tubes of the present invention is applied. FIG. 9B is a schematic exploded perspective view of a heat panel (heat sheet) to which the laminate structure of the heat tubes of the present invention is applied.

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

A heat tube according to an embodiment of the present invention will be described with reference to FIGS. 1A-3. FIG. 1A is a front view of a heat tube according to an embodiment of the present invention, FIG. 1B is a YY cross-sectional view of FIG. 1A, FIG. 2 is a schematic diagram showing the cross section of the heat tube in a flat state, and FIG. 3 is the present invention. 2 is a schematic cut-out perspective view having a partial notch of the heat tube according to the embodiment of FIG.

The heat pipe 11 includes a pipe body 12 which is a cylindrical tubular body having a predetermined length, and a cylindrical heat generating layer 13 which extends from one end to the other end of the pipe body 12 and is fixed to the inner surface of the pipe body 12. and have The pipe body 12 may be a steel pipe, a ceramic pipe, a concrete pipe, or a pipe made of synthetic resin such as vinyl chloride. The heat-generating layer 13 consists of an outer insulating layer 16 (first fibrous layer) that is directly fixed to the pipe body 12 and an inner insulating layer 17 (first fibrous layer) that is directly in contact with the flowing fluid. 2 fibrous layers) and a heat generating member 18 provided on the inner insulating layer 17 . Note that the outer insulating layer 16 and the inner insulating layer 17 constitute a heat-resistant insulating layer. The heat generating member 18 is connected to a power source 21 and a control section 22 through wires connected to terminals (not shown) provided on one end 19 side or the other end 20 side of the pipe body 12 . The power supply 21 may be either direct current or alternating current, or may be a commercial power supply or a storage battery powered by a natural energy source such as solar power generation. The control unit 22 has a function of controlling the temperature of the heat generating member 18 based on, for example, the value detected by a temperature sensor (not shown) that detects the temperature of the fluid flowing through the heat pipe 11 from one end 19 to the other end 20. . The fluid 23a that has flowed in from one end 19 of the heat pipe 11 flows out from the other end 20 as a fluid 23b that has been heated to a predetermined temperature by the heat generating member 18 of the heat generating layer 13 for use.

The outer insulating layer 16 (first fibrous layer) and the inner insulating layer 17 (second fibrous layer) are heat-resistant insulating layers, and together constitute a heat-resistant insulating layer. The outer insulating layer 16 (first fibrous layer) functions not only as an insulating layer but also as a heat insulating layer that prevents the heat generated by the heat generating member 18 from radiating to the outside through the pipe body 12 . The outer insulating layer 16 is formed of, for example, a glass fiber mat (nonwoven fabric). The glass fiber mat also includes a thin glass fiber sheet (for example, a thickness of 4 mm or less). The inner insulating layer 17 (second fibrous layer) has functions such as waterproofing and imperviousness in order to protect the heat-generating member 18 from flowing fluid in addition to its function as an insulating layer. The inner insulating layer 17 includes, for example, a polyethylene mat (nonwoven fabric) 17a in contact with the outer insulating layer 16, and a glass fiber sheet 17b (or fluorine glass coating material) covering the heat generating member 18 provided on the surface of the polyethylene mat 17a. (see FIG. 2). The inner insulating layer 17 may be coated with polyurea resin in order to improve heat resistance, water resistance, and strength depending on the type of fluid flowing and the heating temperature. Polyurea resin is a resin compound based on urea bonds generated by a chemical reaction between isocyanate and polyamine, and functions as a lining material that enhances the strength of objects in various applications. In addition, the outer insulating layer 16 (first fibrous layer) and the inner insulating layer 17 (second fibrous layer) are impregnated with a curable resin that is cured by heat energy or light energy (for example, ultraviolet rays), which will be described later. After being inserted into the tube main body 12 and expanded in diameter, the inner insulating layer 17 and the outer insulating layer 16 are integrally fixed to the tube main body 12 by heating or light irradiation (light source lamp, etc.). Examples of thermosetting resins include epoxy resins, vinyl ester resins, unsaturated polyester resins, melamine resins, and urea resins. Examples of photocurable resins include epoxy resins.

As shown in FIG. 2, the heat-generating member 18 provided on the inner insulating layer 17 (second fibrous layer) is a planar heat-generating element 25 which is a pattern-designed stainless steel foil (20 μm to 30 μm thick) heat-generating element. (see FIG. 4A). Specifically, the heating member 18, which is a planar heating element 25, is placed on a polyethylene mat (non-woven fabric) 17a laminated on the outer insulating layer 16 (first fibrous layer), and the heating member 18 is covered with glass. A fiber sheet 17b (or a fluorine glass coating material or the like) is provided (see the partially cut-out portion in FIGS. 2 and 3). Since the heat generating member 18, which is the planar heating element 25, is made of stainless steel foil, it is possible to heat in a higher temperature range than an aluminum foil heater. Become. Since it is a thin stainless steel foil, it is excellent in flexibility, can be flexibly attached, and is suitable for use as a curved surface such as the heater tube 11 according to the present embodiment. Metal terminals 28a and 28b are provided at the ends of the stainless steel foil patterned as the heater circuit, and are connected to the power supply 21 and the control unit 22 through wiring (not shown) connected to the terminals 28a and 28a. (see FIG. 1A).

Next, a method for manufacturing a heat tube will be described with reference to FIGS. 4A to 4C. As shown in FIG. 4A, a patterned stainless steel foil sheet heating element 25 (heat generating member 18) is placed on a polyethylene mat (nonwoven fabric) 17a, and a glass fiber sheet is placed to cover the sheet heating element 25. As shown in FIG. 17b (or a fluorine glass coating material) is provided to form a second fibrous mat 32 (see FIG. 2). Then, a second fibrous mat 32 (second fibrous layer) is layered on the first fibrous mat 31 (first fibrous layer), which is a glass fiber mat, to form a heat-generating laminate 35 (Fig. 4B). The planar heating element 25 is arranged on a polyethylene mat (nonwoven fabric) 17a, and a glass fiber sheet 17b (or a fluorine glass coating material) is provided so as to cover the planar heating element 25. (see FIG. 2), a fluorine glass coating material may be provided on the glass fiber sheet 17b.

As shown in FIG. 4B, the formed heat-generating laminate 35 is bent into a tubular shape along arrow directions 37a and 37b with the second fibrous layer mat 32 facing inside. Then, the two ends of the heat-generating layered body 35 bent into a tubular shape are sewn together with a para-aramid fiber suture thread 34 or the like (see FIG. 4C). This suture thread 34 is a high-strength, high-modulus fiber that is excellent in low creep, cut resistance, vibration damping, heat resistance, and low dielectric constant among high-performance fibers. is. The stitched heating laminate 35 forms a tubular tubular heating laminate 38 as shown in FIG. 4C. The outer insulating layer 16 (first fibrous layer) and the inner insulating layer 17 (second fibrous layer) of the tubular heat-generating laminate 38 are impregnated with a thermosetting resin such as unsaturated polyester resin (see FIG. 2). ). Incidentally, instead of the thermosetting resin, it is possible to impregnate a photocurable resin (for example, unsaturated polyester resin, etc.) that is cured by light energy (for example, ultraviolet rays). As a method for impregnation, for example, the tubular heat-generating laminate 38 can be immersed in a tank containing a liquid thermosetting resin (or photo-setting resin), but the method is not limited to this. Note that the heat-generating laminate 35 may be impregnated with a thermosetting resin (or a photocurable resin) before the tubular heat-generating laminate 38 is formed.

Next, the tubular heat-generating laminate 38 is inserted into the tube main body 12 , both ends of the tubular heat-generating laminate 38 are sealed (not shown), and a fluid such as high-pressure air or high-pressure water is introduced into the tubular heat-generating laminate 38 . It is introduced into the inside and radially expands the tubular heat-generating laminated body 38 so as to come into contact with the inner surface of the pipe main body 12 . When the first fibrous mat 31 (outer insulation layer 16) of the tubular heating laminate 38 contacts the inner surface of the tube body 12 due to expansion, the outer insulation layer 16 (outer insulation layer 16) is heated by converting the high pressure air into steam (or high temperature water). The thermosetting resin impregnated in each of the first fibrous layer) and the inner insulating layer 17 (second fibrous layer) is cured to form a tubular heat generating layer 13 fixed to the inner surface of the pipe body 12. Thus, the heat tube 11 is manufactured (see FIG. 1A). When a light (for example, ultraviolet) curable resin is impregnated, the curable resin is cured by irradiation with light such as ultraviolet light (light source lamp, etc.).

The manufactured heat tube 11 can be used, for example, in the equipment of a semiconductor manufacturing factory to heat the flowing fluid and prevent deposits remaining on the inner wall from adhering. In addition, freezing can be prevented by using it as a pipe for tap water and industrial water and heating it. Moreover, by using the heat pipe 11 in a disaster area or the like, it can be used to supply hot water for a bath, a shower, or the like. Furthermore, it can also be used for snow melting on roads and roofs in cold regions.

Next, a modification of the heating element will be described with reference to FIG. In addition, the same name and the same code are used for common elements. As shown in FIG. 5, a heating member 18a is formed by sandwiching a planar heating element 25 made of stainless steel foil with a pattern design between a lower base film 26 and an upper cover film 27. As shown in FIG. The base film 26 and the cover film 27 are fixed with a heat-resistant adhesive, and integrally formed with the planar heating element 25 therebetween to form the heating member 18a. The base film 26 and the cover film 27 are made of polyimide film, which has a higher heat resistance than polyester and is suitable as an insulating material.

A heat generating member 18a shown in FIG. 5 can be used instead of the heat generating member 18 shown in FIG. That is, a heating member 18a is placed on a polyethylene mat 17a shown in FIG. 2, and a glass sheet 17b (or glass coating material) is laminated thereon to form a heating laminate (see FIG. 4B). As described above, the polyimide film used for the heat-generating member 18a is a highly heat-resistant and highly functional film, and is a material used as a heat-resistant insulating material. This makes it possible to provide the heat-generating member 18a with excellent heat resistance and the heat-generating laminate using the heat-generating member 18a. As shown in FIG. 5, the heat-generating member 18a sandwiches the planar heat-generating element 25 between the base film 26 and the cover film 27. It may be

Furthermore, on the first fibrous mat 31 (first fibrous layer), which is a glass fiber mat, an aluminum foil tape is provided as a heating element, and a glass felt knit is laminated thereon as a second fibrous layer. good too. The first fibrous layer and the second fibrous layer are impregnated with the curable resin in the same manner as described above.

Next, with reference to FIGS. 6 and 7, a method of manufacturing a heat pipe using an existing pipe as a pipe main body will be described. FIG. 6 is a schematic diagram of forming a heat pipe by inserting a tubular heat-generating laminate (hereinafter referred to as "lining material") into an existing pipe (pipe body), and FIG. FIG. 4 is a schematic diagram of forming a heat tube by inserting a heat-generating laminate (lining material) upside down.

As shown in FIG. 6, a pipe 51 for tap water, industrial water, or the like is buried underground. Two openings such as manholes on the ground are opened, and a heat tube is manufactured using the pipe 51 between directly under one opening 53 and directly under the other opening 55 as a pipe body. On the ground surface on the one opening 53 side, a lining material delivery device 58 containing a tubular heat-generating laminated body 38 of a predetermined length as a lining material 57 and high-pressure air or the like for supplying high-pressure air and steam into the lining material 57 . A feeding device 60 is arranged. A hoist (winch) 63 for winding a pull-out rope 61 connected to the tip of the lining material 57 is arranged on the ground surface on the other opening 55 side.

Before inserting the lining material 57 into the pipe 51, the water is changed and the water flow to the pipe 51 is stopped. After that, the inside of the pipe 51 is cleaned and the presence or absence of foreign matter is checked to prepare for the introduction of the lining material 57 . The lining material 57 (tubular heat-generating laminated body 38 ) is pulled out from the lining material delivery device 58 and the tip is connected to the pull-out rope 61 via the connector 65 . A pull-out rope 61 is put into the ground through an opening 53, inserted into a pipe 51, pulled out to the ground through an opening 55, and attached to a hoist 63. - 特許庁The hoisting machine 63 is operated to spread the lining material 57 over the entire length of the pipe 51, and the hoisting machine 63 is stopped. The lining material 57 is cut to a predetermined length along the entire length of the pipe 51 , and a high-pressure air supply pipe (not shown) is introduced into the lining material 57 from a high-pressure air supply device 60 . After both ends of the lining material 57 are sealed, high-pressure air is supplied from the high-pressure air supply device 60 to radially expand the lining material 57 so as to come into contact with the inner surface of the pipe 51 . When the lining material 57 is in contact with the inner surface of the pipe 51, steam is supplied from the high-pressure air supply device 60 to harden the thermosetting resin impregnated in the lining material 57 (the tubular heat-generating laminate 38), thereby removing the lining. A material 57 is fixed to the inner surface of the pipe 51 . Then, the planar heating element of the lining material 57 is connected to a power supply and control unit (not shown). Thereby, the heat pipe 11 can be formed by using the lining material 57 as the heat generating layer 13 and the pipe 51 as the pipe main body 12 (see FIG. 1A). When a light (for example, ultraviolet) curable resin is impregnated, the curable resin is cured by irradiation with light such as ultraviolet light (light source lamp, etc.).

By forming a heat pipe using the pipe 51 as the pipe main body 12, for example, heated warm water can flow to prevent freezing. In addition, it becomes possible to supply hot water in a timely manner in disaster areas and remote islands. In addition, as a pipe for factory equipment, it is possible to heat and retain heat in the flowing fluid, and for example, it is possible to suppress the generation of deposits.

In the method of manufacturing the heat tube described above, the lining material 57 is inserted into the pipe 51 using the pull-out rope 61. However, as shown in FIG. It can be inserted into the pipe 51 by pressure from the supply. Hereinafter, reverse insertion of the lining material will be described with reference to FIG.

As shown in FIG. 7, the lining material 57a is pulled out from the lining material delivery device 58, turned inside out (inverted), and the tip thereof is fixed to the tip 67a of the outlet 67. As shown in FIG. The lining material 57a stored in the lining material delivery device 57 shown in FIG. 7 is inserted into the pipe 51 in an inverted state. The fibrous mat 32 is arranged so that the inner and outer sides are reversed. As shown in FIG. 7, the first fiber mat, which is a glass fiber mat, is directly fixed to the pipe 51 because it is reversely inserted in both cases of FIGS.

After the lining material 57a is turned inside out (inverted) and its tip is fixed to the tip 67a of the take-out port 67, high-pressure air is supplied from the high-pressure air supply device 60 into the take-out port 67 to press the reversed lining material 57a. It can be inserted into the pipe 51 directly from the opening 53 by pressure (see arrow 68). The lining material 57 a inserted into the pipe 51 is stopped when it reaches a stop plate 69 provided directly below the opening 55 . At this time, since the lining material 57a is in contact with the inner surface of the pipe 51 due to the high-pressure air, the air is switched to steam. The lining material 57 can be fixed to the inner surface of the pipe 51 by curing the thermosetting resin impregnated in the lining material 57a (the tubular heat-generating laminate 38). When a light (for example, ultraviolet) curable resin is impregnated, the curable resin is cured by irradiation with light such as ultraviolet light (light source lamp, etc.). Then, the planar heating element of the lining material 57 is connected to a power supply and control unit (not shown). As a result, the heat pipe 11 is formed by using the lining material 57 as the heat generating layer 13 and the pipe 51 as the pipe main body 12 (see FIG. 1A). When the lining material 57a is reversely inserted, the pull-out rope 61 and the hoist 63 (winch) can be eliminated.

Next, another embodiment of a heat tube according to an embodiment of the present invention will be described with reference to FIG. 8A, and a modification thereof with reference to FIG. 8B. In addition, the same names and the same reference numerals are used for components that are common to the heat pipe 11 described above.

As shown in FIG. 8A, the heat tube 71 has a structure in which one end of the tube body 12 is closed, that is, has a bottom. By supplying power from the power source 21 to the heat generation layer 13 via the control unit 22, the heat pipe 71 can be used as a water heater that stores hot water heated to a predetermined temperature. Electric power is supplied from the power supply 21 to a planar heating element (not shown) that forms a heat generating member (not shown) included in the heat generating layer 13, and the controller 22 heats the water stored in the heat tube 71 to a predetermined temperature. By doing so, for example, it can be used as a water heater for baths and showers in the event of a disaster. It can also be used as a cage for aquaculture, such as fish that require warm water.

As shown in FIG. 8B, by providing an inlet 75 and an outlet 76 in the heat pipe 72 of FIG. 8A, hot water can be continuously used. That is, cold water is supplied from the inlet 75 to the heat pipe 72, and hot water heated to a predetermined temperature by the heat pipe 72 is taken out from the outlet 76, thereby enabling continuous use as a water heater.

As described above, the heat generating member 18 is composed of the patterned stainless steel foil planar heating element 25 and the glass fiber sheet 17b (or fluorine glass coating material) covering the planar heating element 25, or the patterned planar stainless steel foil The heating member 18a is composed of the heating element 25, the base film 26 and the cover film 27 made of polyimide film, but is not limited to this. Only the cover film 27 may be used for the sheet heating element 25 without using the base film 26, and the sheet heating element 25 made of stainless steel foil may be replaced by a sheet heating element using aluminum foil. A heating element using a nichrome wire may be used. Also, depending on the heating temperature of the heating element, a polyester film having a lower heat resistance temperature than the polyimide film can be used in place of the polyimide film. Furthermore, it is also possible to use a mica film (mica film). A polyester sheet (nonwoven fabric) or a glass fiber composite felt sheet may be used in place of the glass fiber sheet. Furthermore, a mat made of silica fibers coated with a water-repellent material may be used in place of the polyethylene mat.

Furthermore, another embodiment to which the heat tube of the present invention is applied will be described with reference to FIGS. 9A and 9B. 9A is a sectional view of a heat panel (heat sheet) to which the laminated structure of the heat tube of the present invention is applied, and FIG. 9B is a schematic exploded perspective view of the heat panel (heat sheet) to which the laminated structure of the heat tube of the present invention is applied. It is a diagram. In addition, the same names and the same reference numerals are used for components that are common to the heat pipe 11 described above.

As shown in FIG. 9A, the heat panel 81 includes a heat insulating layer 82 as a bottom portion, a first insulating layer 83 laminated on the heat insulating layer 82, and a heat generating member 18 provided on the first insulating layer 83. (see FIG. 9B) and a second insulating layer 85 laminated so as to cover the planar heating element 25 . As described above, the planar heating element 25 is a pattern-designed stainless steel foil (20 μm to 30 μm thick) heating element, and metal terminals 28 a and 28 b are provided at the ends of the planar heating element 25 . It is connected to a temperature sensor (not shown), a power supply (not shown) and a controller (not shown) through wires (not shown) connected to terminals 28a, 28a (see FIG. 9B). As will be described later, the controller can control the planar heating element 25, which is the heating member 18, to a set temperature based on the temperature detected by the temperature sensor.

The first insulating layer 83 and the second insulating layer 85 sandwiching the planar heating element 25 are insulating layers having heat resistance against the heating temperature of the planar heating element 25 . The first insulating layer 83 on which the planar heating element 25 is placed is formed of a glass fiber mat (nonwoven fabric). Note that the glass fiber mat also includes a thin glass fiber sheet (for example, a thickness of 4 mm or less). The second insulating layer 85 laminated so as to cover the planar heating element 25 is a heat-resistant insulating layer and also serves as a waterproof layer (water resistant layer) for the planar heating element 25 which is the heat generating member 18 . The second insulating layer 85 is formed of a glass fiber sheet (or a film such as a fluorine glass coating material). The heat insulating layer 82 serving as the bottom has a role of suppressing the heat generated by the planar heating element 25 from radiating from the bottom side, and is formed of a polyethylene mat (or a glass fiber mat). The heat insulating layer 82, the first insulating layer 83 provided with the planar heating element 25, and the second insulating layer 85 are integrally bonded with a heat-resistant adhesive. The heat insulating layer 82, the first insulating layer 83, and the second insulating layer 85 are impregnated with a curing resin that is cured by heat energy or light energy (for example, ultraviolet rays), and is cured by heating or light irradiation. A panel 81 is formed. Examples of thermosetting resins include epoxy resins, vinyl ester resins, unsaturated polyester resins, melamine resins, and urea resins. Examples of photocurable resins include epoxy resins.

Next, the manufacturing process of the heat panel (heat sheet) according to this embodiment will be described with reference to FIG. 9B. A glass fiber mat 91 (first insulating layer 83) on which a planar heating element 25, which is a heat generating member 18, is placed is laminated on a polyethylene mat 92 (heat insulating layer 82). The polyethylene mat 92 and the glass fiber mat 91 are stuck together by using a heat-resistant adhesive. Next, a glass fiber sheet 93 is attached using a heat-resistant adhesive so as to cover the planar heating element 25 to form a laminate. Then, the laminate is impregnated with a thermosetting resin (or a photocurable resin) and cured by heating or light irradiation to form a heat panel 81 (see FIG. 9A).

The heat panel formed in this manner can melt accumulated snow on the roof, for example, by installing it on the roof as a roof member, thereby reducing the labor required to remove the snow. In addition, it can be used as a heating facility by attaching it to the wall of the building or laying it on the floor. In particular, by using it for temporary housing in the event of a disaster, it is possible to easily provide heating equipment. The range of use can be expanded by using power sources using natural energy such as sunlight and wind power in addition to commercial power sources. By using a temperature sensor and a control device, it is possible to provide a safe and convenient heating facility.

In this embodiment, the heat panel 81 using a curable resin has been described, but it can also be used as a flexible heat sheet without using a curable resin. A flexible heat sheet can be folded and has a high degree of portability. In this embodiment, the glass fiber sheet 93 is used as the second insulating layer 85, but it is not limited to this, and can be covered with a film formed of a fluorine glass coating material or the like. In addition, although the planar heating element 25 made of stainless steel is used as the heat generating member 18, a planar heating element using an aluminum foil may be used, or a heating element using a nichrome wire may be used. Further, although a polyethylene mat 92 was used as the bottom heat insulating layer 82, a glass fiber mat could also be used.

Several embodiments and modifications of each part of the present invention have been described above, but these embodiments and modifications of each part are presented as examples and are not intended to limit the scope of the invention. . These novel embodiments described above can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims.

As described above, in the heat tube and the heat tube manufacturing method according to the present invention, the heating layer directly heats the fluid flowing through the tube body, so that the heating can be performed quickly and efficiently. and a tubular heat generating layer fixed to the inner surface of the pipe body.

REFERENCE SIGNS LIST 11 heat tube 12 tube main body 13 heat generating layer 16 outer insulating layer (first fibrous layer)
17 inner insulating layer (second fibrous layer)
17a polyethylene mat (non-woven fabric)
17b Glass sheet 18, 18a Heat generating member 19 One end 20 Other end 21 Power source 22 Control unit 25 Planar heating element 26 Base film 27 Cover film 28a, 28b Terminal 31 First fiber mat (glass fiber mat)
32 second fibrous mat (polyethylene mat)
34 suture thread 35, 35a heat-generating laminate 37a, 37b direction of arrow 38 tubular heat-generating laminate 51 pipe 53, 55 opening 57, 57a lining material (tubular heat-generating laminate)
58 lining material delivery device 60 high-pressure air supply device 61 pull-out rope 63 hoist 65 connector 67 outlet 67a tip 68 arrow 69 stop plate 71, 72 heat tube 75 inlet 76 outlet 81 heat panel 82 heat insulating layer 83 third First insulating layer 85 Second insulating layer 91 Glass fiber mat 92 Polyethylene mat 93 Glass fiber sheet

Claims (8)

a pipe body;
a tubular heat-generating layer fixed to the inner surface of the pipe body;
The heat generating layer is
a heat-resistant insulating layer fixed to the inner surface of the pipe body;
a heat-generating member arranged in the heat-resistant insulating layer and generating heat when energized. The heat-resistant insulating layer has a first fibrous layer containing a cured resin and a second fibrous layer containing a cured resin,
2. The heat pipe according to claim 1, wherein the heat generating member is provided on the second fibrous layer. 3. The heat pipe according to claim 1, wherein the heat generating member has a planar heat generating element. 4. The heat tube according to any one of claims 1 to 3, wherein said tube main body is a tubular body through which a fluid flows. 4. The heat tube according to any one of claims 1 to 3, wherein said tube body is a tubular body with one end closed. a first step of forming a heat-generating laminate in which a first fibrous mat and a second fibrous mat provided with a heat-generating member are laminated in this order;
a second step of forming a tubular heat-generating laminate impregnated with a curable resin from the heat-generating laminate;
a third step of inserting the tubular heat-generating laminate into the tubular body;
a fourth step of radially expanding the tubular heating laminate within the tubular body;
a fifth step of curing the curable resin impregnated in the tubular heat-generating laminate in the expanded state within the pipe body to form a tubular heat-generating layer fixed to the inner surface of the pipe body;
A method for manufacturing a heat tube having 7. The method of manufacturing a heat tube according to claim 6, wherein the tubular heat generating laminate is formed by sewing the heat generating laminate into a tubular shape. 8. The method of manufacturing a heat tube according to claim 6, wherein the tubular heat-generating laminate is radially expanded within the tube body by supplying a fluid to the tubular heat-generating laminate.

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