Heater device and method for manufacturing heater device

Abstract

A heater device is provided in which the durability of the pull-out portion, in which the heating element's wires or the like are pulled out of the device, is increased when the device covers and heats the object. The heater device is characterized by covering and heating the object by a heater body; the heater body has at least an inner sheath, an outer sheath, and a heating element surrounded by the inner and outer sheaths, all in contact with the object; the heating element has a heater wire that heats up when energized, and a plurality of wires connected to the heater wire and supplied with power, and covered by an insulator; a reinforcing plate is fixed in the outer sheath for the pull-out portion through which the plurality of wires are pulled out; the plurality of wires are pulled out through the outer sheath and the reinforcing plate.

Description

[Technical Field]

[0001] The present invention relates to a heater device for covering and heating an object to be heated. [Previous Technology]

[0002] Patent Document 1 describes a mantle heater for heating piping, etc. The mantle heater is composed of an inner skin material on the piping side, an outer skin material forming the outside, a heating element with heating wires sewn on, and a laminated body made of insulation material, etc., which is wound around the piping and used to heat the piping.

[0003] [Prior Art Documents] (Patent Documents) Patent Document 1: Japanese Patent No. 3752583 [Summary of the Invention]

[0004] [Problem to be solved by the invention] In the hood heater of Patent Document 1, a wire (lead wire) is connected to a heating wire, and the wire pulled out to the outside of the heater is connected to a power source via a power connection connector.

[0005] In the portion where the conductor's self-heating layer is pulled out, the outer sheath may be damaged if force is applied such as pulling on the conductor. Furthermore, the outer sheath may also be damaged in the pull-out portion where a temperature sensor such as a thermocouple is pulled out of the self-heating layer.

[0006] The object of the present invention is to provide a heater device in which the pull-out portion, in which the heating element’s wires or the like are pulled out of the device, has higher durability.

[0007] [Technical means to solve the problem] The gist of the present invention for solving the above-mentioned problem is as follows. (1) A heater device, characterized in that a heater body covers and heats a heating object; the heater body has at least an inner skin material, an outer skin material, and a heating element surrounded by the inner skin material and the outer skin material in contact with the heating object; the heating element has a heater wire that heats up by being energized, and a plurality of wires connected to the heater wire and supplied with power and covered by an insulator; a reinforcing plate is fixed in the outer skin material for the plurality of wires to be pulled out to the outside; the plurality of wires are pulled out to the outside through the outer skin material and the reinforcing plate.

[0008] (2) The heater device described in (1) above, wherein the aforementioned plurality of wires are pulled out to the outside through the aforementioned outer sheath and the aforementioned reinforcing sheet in a separated state.

[0009] (3) The heater device described in (1) above, wherein the aforementioned plurality of wires are pulled out to the outside through the aforementioned outer sheath and the aforementioned reinforcing sheet in an integrated state.

[0010] (4) A heater device, characterized in that a heater body covers and heats a heated object; the heater body has at least an inner skin, an outer skin, and a heating element surrounded by the inner skin and the outer skin in contact with the heated object; the heater device has a temperature sensor for detecting the temperature of the heated object, the temperature sensor being a thermocouple or resistance thermometer pulled out from the pull-out portion of the outer skin through the heater body from the front end side disposed on the heated object side; a reinforcing sheet is fixed in the pull-out portion of the outer skin, and the thermocouple or resistance thermometer is pulled out to the outside through the outer skin and the reinforcing sheet.

[0011] (5) The heater device as described in (1) or (4) above, wherein the aforementioned reinforcing sheet is a glass fiber sheet, a fluoropolymer sheet, or a fluoropolymer sheet.

[0012] (6) The heater device as described in (1) or (4) above, wherein the aforementioned reinforcing sheet is stitched and fixed to the aforementioned outer skin material.

[0013] (7) A method for manufacturing a heater device, characterized in that the heater device covers and heats a heating object by means of a heater body; the heater body has at least an inner sheath, an outer sheath, and a heating element surrounded by the inner and outer sheaths in contact with the heating object; the heating element has a heater wire that heats up by being energized, and a plurality of wires connected to the heater wire and supplied with power and covered by an insulator; the heater body has a reinforcing piece fixed in the outer sheath for the plurality of wires to be pulled out to the outside; the method for manufacturing the heater device includes the step of passing the plurality of wires through the outer sheath and the reinforcing piece.

Implementation Method

[0015] (First Embodiment) Hereinafter, an embodiment will be described with reference to the drawings. The heater device 1 of this embodiment is installed on the outer peripheral surface of the object to be heated, namely the piping 100, to heat the piping 100. The heater device 1 is capable of heating the piping 100, for example, in order to prevent byproducts and exhaust gas from condensing and precipitating inside the piping 100 through which gas flows.

[0016] FIG1 is a perspective view showing the configuration of the heater device 1 installed on the cylindrical pipe 100. FIG2 is a cross-sectional view showing the configuration of the heater device 1. In FIG1, the X-axis, Y-axis and Z-axis are mutually orthogonal axes, and the pipe 100 extends in the X-axis direction. In addition, in this embodiment, the example of installing the heater device 1 on the pipe 100 extending in the X-axis direction is described, but it is also possible to install the heater device 1 on a bent pipe 100. In this case, it is sufficient to form the heater device 1 into a bent shape along the bent portion of the pipe 100.

[0017] The heater device 1 is arranged along the circumferential direction of the piping 100 and has a pair of mating and close-fitting portions 1A, 1B that are mated and close-fitting with each other in the circumferential direction of the piping 100. The heater device 1 is bent along the piping 100 to cover the outer circumferential surface of the piping 100, and the pair of mating and close-fitting portions 1A, 1B are mated and close-fitting, thereby enabling the heater device 1 to be installed on the piping 100. With the heater device 1 installed on the piping 100, it is energized to heat and maintain the temperature of the piping 100.

[0018] The heater device 1 of this embodiment includes an inner sheath 20, a heating element 40, a heat insulation material 30, an outer sheath 22, and a reinforcing sheet 60. The laminated body formed by the inner sheath 20, the heating element 40, and the outer sheath 22 constitutes the heater body 10. The heater device 1 covers and heats the object to be heated using the heater body 10. In the heater device 1 of this embodiment, the heater body 10 is constructed by laminating the inner sheath 20, the heating element 40, the heat insulation material 30, and the outer sheath 22 in that order, starting from the side of the heated piping 100 (heating side). Furthermore, the heating element 40 and the heat insulation material 30 are surrounded by an enclosure, namely the inner sheath 20 and the outer sheath 22.

[0019] The inner skin 20 forms the inner surface of the heater device 1 and is in contact with the outer peripheral surface of the piping 100 of the object to be heated. Heat from the heating element 40 is transferred to the piping 100 via the inner skin 20.

[0020] The outer sheath 22 constitutes the outer surface of the heater device 1. In this embodiment, the power cord 40c of the heater wire 40a connected to the heating element 40 is pulled out of the device from the designated pull-out portion P in the outer sheath 22.

[0021] Here, the pull-out portion P refers to the hole and its surrounding area in which the power supply wires 40c (wires c1, c2) in the outer sheath 22 are pulled out to the outside. The wires c1 and c2 in the pull-out portion P can be pulled out from one hole as a whole, or they can be pulled out separately. In this embodiment, the pull-out portion P is described as having a structure in which the two wires c1 and c2 of the power supply wire 40c extending from the heater wire 40a are each pulled out from the outer sheath 22 to the outside in a separate state. A reinforcing piece 60 is fixed to the pull-out portion P to reinforce the outer sheath 22. The wires c1 and c2 of the power supply wire 40c are each pulled out to the outside through two holes formed by penetrating the outer sheath 22 and the reinforcing piece 60.

[0022] The inner skin material 20 and the outer skin material 22 can be formed of resin and can also have a porous structure. The inner skin material 20 and the outer skin material 22 can be formed of the same type of resin or of different types of resin.

[0023] The materials used for the inner sheath 20 and the outer sheath 22 are not particularly limited, as long as they are made of materials capable of withstanding the heat transmitted from the self-heating body 40 (heater wire 40a). For example, materials made of PTFE (Polytetrafluoroethylene), PFA (Polyfluoroalkoxy), FEP (Fluorinated ethylene propylene), PCTFE (Polychlorotrifluoroethylene), ETFE (Ethylene-tetrafluoroethylene), ECTFE (Ethylene-chlorotrifluororthylene polymer), and PVDF (Polyvinylidene ether) can be used. Fluoropolymer sheets made of fluorinated resins such as polyvinylidene fluoride (PVDF); or fluoropolymer fiber fabrics (woven fabrics) made of fibers woven from the aforementioned fluorinated resins; inorganic fiber fabrics (woven fabrics) made of inorganic fibers such as glass fibers, silicon oxide fibers, alumina fibers, and silicon-alumina fibers; fluoropolymer-coated inorganic fiber fabrics made by coating the aforementioned inorganic fiber fabrics with the aforementioned fluorinated resins; and silicone resin-coated inorganic fiber fabrics made by coating the aforementioned inorganic fiber fabrics with silicone resins (e.g., silicone resin-coated glass cloth).

[0024] In addition, the inner skin material 20 and the outer skin material 22 may also be made of resin materials other than the aforementioned fluorinated resins, such as polyamide, polycarbonate, polyacetal, polybutylene terephthalate, modified polyphenylene ether, polyphenylene sulfide, polyurethane, polyetherurethane, polyarylate, polyetheretherketone, polyphthalamide, polyimide, polyetherimide, and polymethylpentene.

[0025] The heat insulation material 30 provides heat insulation and heat preservation in a manner that prevents heat from the heating element 40 and the piping 100 from dissipating to the outside. The heat insulation material 30 can be formed, for example, from inorganic fiber sheets or organic fiber sheets, and preferably from materials that are non-combustible or flame-retardant. Inorganic fiber sheets can be made from inorganic fiber materials such as glass fiber, ceramic fiber, or silica fiber. Alternatively, the inorganic fiber material can be needled, using inorganic binders such as colloidal silica, alumina colloidal solution, or sodium silicate, to form a sheet for use. On the other hand, as organic fiber sheets, sheets formed from fibers such as aramid, polyamide, or polyimide can be used.

[0026] The heating element 40 heats up by energizing the piping 100. The heating element 40 includes a heater wire 40a that heats up by energizing the heating element 40a, an inorganic fiber sheet 40b to which the heater wire 40a is sewn, and a power supply wire 40c connected to the heater wire 40a and supplying power. The power supply wire 40c has two conductors c1 and c2 covered with an insulator.

[0027] In this embodiment, the heater wire 40a is arranged along a predetermined pattern to uniformly heat the entire area of ​​the piping 100 covered by the heater device 1. In the heating element 40, an inorganic fiber sheet 40b may be disposed on the inner sheath 20 side (piping side), and the heater wire 40a may be disposed on the insulation material 30 side (outer side) of the inorganic fiber sheet 40b. The ends of both sides of the heater wire 40a are respectively connected to conductors c1 and c2 of a power supply wire 40c and are pulled out to the outside of the heater device 1. The power supply wires 40c (conductors c1 and c2) pulled out of the device are connected to a power source 70 disposed outside the heater device 1. Power flows from the power source 70 to the heater wire 40a, thereby heating the heater wire 40a.

[0028] It is preferable that the pull-out portion P is formed and the reinforcing piece 60 is arranged near the connection between the heater wire 40a and the wires c1, c2, so that the wires c1, c2 can be fixed to any layer of the heater body 10 by sewing or the like, without having to be pulled out to the outside of the heater body 10 and processed at the point of departure.

[0029] As the heater wire 40a, a conventional heater wire can be used, for example, a heater wire with a structure in which the heating wire is wound around a core material such as polyester and glass and covered with an insulator.

[0030] The inorganic fiber sheet 40b is a sheet-like component formed from inorganic fibers such as glass fibers, ceramic fibers, and silicon oxide fibers. The inorganic fiber sheet 40b can be composed of one layer or multiple layers. When the inorganic fiber sheet 40b is composed of multiple layers, each layer can be made of the same material or different materials.

[0031] As the power supply wire 40c, existing power supply wires or cables can be used, as long as they consist of at least two conductors c1 and c2 covered with an insulator. Alternatively, there can be a plurality of conductors, three or more. Preferably, conductors c1 and c2 are covered with a material that has heat resistance to heat from the heater wire 40a. For example, fiberglass braided wires, silicone rubber wires, fluoropolymer wires, etc., can be used.

[0032] Furthermore, it is preferable that the power cord 40c (conductors c1, c2) is a flexible wire. For example, conductors c1, c2 are stranded conductors, and it is preferable that the insulation (coating) of the conductor is formed using a resin that is easy to handle and flexible.

[0033] Furthermore, in order to prevent fraying due to friction with the reinforcing sheet 60, it is preferable to use a material with high wear resistance as the coating material for the outer surface of the conductors c1 and c2, such as a fluoropolymer coating or a glass fiber sheet coated with fluoropolymer or silica resin.

[0034] Furthermore, in this embodiment, the conductors c1 and c2 contained in the power cable 40c are pulled out to the outside through the outer sheath 22 and the reinforcing plate 60 in a separate state. Specifically, conductors c1 and c2 are each pulled out to the outside through two independent holes formed by penetrating the outer sheath 22 and the reinforcing plate 60, so that conductors c1 and c2 are pulled out to the outside in a separate state. The two holes only need to be formed such that there is no gap between the inner surface of the hole and the conductors c1 and c2, and the diameter of the holes is the same as that of the conductors c1 and c2. Also, even if it is assumed that the conductors c1 and c2 in the pull-out part P rub against the holes, causing wear of the sheath and exposing the inner conductors, it is only necessary to form the two holes so that the spacing between them does not cause the conductors to contact each other.

[0035] The wires c1 and c2 that are pulled out to the outside are connected to the power supply 70. The wires c1 and c2 that are pulled out to the outside may be integrated into one as shown in FIG2, taking into account the handling of the wires, etc., or they may be connected to the power supply 70 separately.

[0036] In this embodiment, the reinforcing piece 60 through which the conductors c1 and c2 pass is sewn and fixed to the outer leather material 22 by a suture thread 60a. The material of the suture thread 60a is not particularly limited, and polyester thread and nylon thread can be used. Any sewing method that can reliably fix the reinforcing piece 60 is acceptable. To prevent the suture thread 60a from unraveling, a back stitch is preferred.

[0037] The material of the reinforcing sheet 60 is not particularly limited, as long as it can be sewn together. It is preferably a sheet with low friction, specifically a sheet made of glass fiber, a sheet made of fluoropolymer, or a sheet processed from fluoropolymer. By using a sheet with low friction, friction with the wires c1 and c2 can be prevented.

[0038] Examples of fluoropolymer sheet materials include those made of fluoropolymers such as polytetrafluoroethylene (PTFE), polyfluoroalkoxy (PFA), fluoroethylene-hexafluoropropylene (FEP), polychlorotrifluoroethylene (PCTFE), ethylene-tetrafluoroethylene (ETFE), ethylene-chlorotrifluoroethylene polymer (ECTFE), and polyvinylidene difluoride (PVDF). Alternatively, fabrics (woven fabrics) can be made from fluoropolymer fibers woven from the aforementioned fluoropolymers used as fluoropolymer sheet materials. Furthermore, as a sheet material processed with fluororesin, it is possible to use fluororesin-coated inorganic fiber fabric (woven fabric) obtained by coating inorganic fiber fabric (woven fabric) made of inorganic fibers such as glass fiber and alumina fiber with the aforementioned fluororesin, and sheets made by coating resin sheets with the aforementioned fluororesin, etc.

[0039] Furthermore, as a glass fiber sheet material, it can also be a glass fiber cloth material, or a silicone resin coated glass cloth material made by coating a glass fiber sheet material with silicone resin.

[0040] The method for manufacturing the heater device 1 of this embodiment is as follows. A method for manufacturing a heater device 1, wherein the heater device 1 covers and heats a heating object by means of a heater body 10; the heater body 10 has at least an inner sheath 20 and an outer sheath 22 in contact with the heating object, and a heating element 40 surrounded by the inner sheath 20 and the outer sheath 22; the heating element 40 has a heater wire 40a that heats up by being energized, and a plurality of wires c1, c2 connected to the heater wire 40a and supplied with power and covered by an insulator; the heater body 10 has a reinforcing piece 60 fixed in the outer sheath 22 for the plurality of wires c1, c2 to be pulled out to the outside; the method for manufacturing the heater device includes a step of passing the plurality of wires c1, c2 through the outer sheath 22 and the reinforcing piece 60.

[0041] According to the present embodiment described above, by reinforcing the pull-out portion P of the power supply cable 40c with the reinforcing sheet 60, the strength of the pull-out portion P can be improved. Therefore, even when the power cable 40c is pulled, damage to the pull-out portion P of the outer sheath 22 can be prevented. Furthermore, the reinforcing sheet 60 is constructed of low-friction glass fiber sheet, fluororesin sheet, or fluororesin-processed sheet, thereby preventing friction with the conductors c1 and c2. This prevents damage caused by wear of the reinforcing sheet 60, thus improving the overall durability of the pull-out portion P. It also effectively prevents damage caused by wear of the sheathing of the conductors c1 and c2.

[0042] Furthermore, in this embodiment, the wires c1 and c2 of the heating element 40 are pulled out to the outside in a separated state by the outer sheath 22 and the reinforcing sheet 60, thereby preventing friction between the wires c1 and c2. This effectively prevents wear and damage to the sheath caused by friction.

[0043] Furthermore, even if the sheathing of wires c1 and c2 wears down due to friction, causing the wires near the pull-out part P to be exposed without sheathing, the wires c1 and c2 in the pull-out part P pass through the outer sheath 22 and the reinforcing sheet 60 while separated from each other, so short circuits can be prevented.

[0044] Furthermore, according to this embodiment, the diameter of the hole through which the reinforcing sheet 60 allows the wires c1 and c2 to pass is formed to be the same as that of the wires c1 and c2, and there is almost no gap between the reinforcing sheet 60 and the wires c1 and c2. Therefore, it is possible to prevent dust from the heat insulation material 30 and other materials constituting the heater body 10 from being discharged to the outside through the hole of the pull-out part P, and to prevent dust from entering the interior from the outside.

[0045] Furthermore, according to this embodiment, even if the outer skin 22 of the pull-out portion P is damaged, the pull-out portion P is covered and reinforced by the reinforcing sheet 60, thus preventing further damage to the interior of the outer skin 22. Moreover, since damage is suppressed, dust generation from the interior caused by damage can be prevented.

[0046] Furthermore, the above embodiment is described in relation to a heater device 1 in which the conductors c1 and c2 of the power cord 40c are respectively connected to both ends of a heater wire 40a arranged in a predetermined pattern, but is not limited thereto. For example, a heater device may also be constructed in which the conductors c1 and c2 are connected to a plurality of heater wires connected in parallel.

[0047] Furthermore, this embodiment describes the case where the power cable 40c is composed of two conductors, but it is not limited to this. It can also be composed of three or more conductors, and is applicable to cases where multiple conductors are pulled out from the pull-out section. For example, it can be composed of three or more conductors, or it can be composed of a wire with three or more cores, including a grounding wire. Even in any configuration, when the power cable 40c is pulled out to the outside through the outer sheath 22 and the reinforcing piece 60, the multiple conductors are pulled out to the outside in a separated state.

[0048] Furthermore, while the heater device 1 in this embodiment includes a heat insulation material 30, the heat insulation material 30 can be omitted by having other layers with heat insulation capabilities. Alternatively, the heater device 1 may further include layers and sheets other than those described above, depending on the need. For example, an inorganic fiber sheet can be disposed between the heat insulation material 30 and the outer sheath 22. This inorganic fiber sheet can be formed using the same material as the aforementioned inorganic fiber sheet 40b, and can be constructed in one or more layers.

[0049] Furthermore, the reinforcing piece 60 is fixed to the outer skin material 22 by suturing with suture 60a, but other means may also be used, as long as it can be fixed. For example, it may be fixed to the outer skin material 22 by other fixing means such as adhesive.

[0050] Furthermore, in this embodiment, the reinforcing sheet 60 is described as a single sheet. However, it could also be configured such that reinforcing sheets are fixed at the points where conductors c1 and c2 are pulled out, and conductors c1 and c2 are pulled out through holes formed in the individual reinforcing sheets. Also, the reinforcing sheet 60 could be formed by overlapping multiple reinforcing sheets.

[0051] The holes in the outer sheath 22 of this embodiment for the conductors c1 and c2 to pass through are holes that conform to the shape of the conductors c1 and c2, but are not limited thereto. The holes in the outer sheath 22 can also be, for example, slit-shaped holes formed by cutting straight cuts in the outer sheath 22. Slit-shaped holes can also be formed by arranging and configuring two reinforcing sheets and creating a gap between the two reinforcing sheets.

[0052] Furthermore, in this embodiment, the object to be heated by the heater device 1 is described as the piping 100, but it is not limited to this. Anything that is covered and heated by the heater body 10 is acceptable. By forming the heater device 1 to match the shape of the object to be heated, it is possible to heat various items other than the piping 100 such as flanges, joints, valves, clamps, tanks, and pumps.

[0053] Furthermore, the heater device 1 may also include a temperature sensor to detect the object being heated, such as the piping 100. For example, a thermocouple can be used as the temperature sensor. The energizing of the heating element 40 is controlled based on the temperature measured by the temperature sensor to maintain the temperature of the piping 100 at an ideal temperature. Furthermore, the heater device 1 may also include a thermostat to switch the energizing / de-energizing of the heating element 40 according to the temperature. By including the thermostat, thermal runaway of the heater device 1 can be suppressed.

[0054] This embodiment describes the heater device 1, but is not limited to it. It may also include a heating section with the same configuration as the heater device 1, covering piping and heating components. The heating section may be configured as part of, for example, a device with piping. The same applies to other embodiments shown below.

[0055] (Second Embodiment) Next, the second embodiment will be described with reference to FIG3. FIG3 is a cross-sectional view showing the structure of the heater device 200 of this embodiment. As shown in FIG3, in the pull-out part P, in this embodiment, the conductors c1 and c2 of the power cord 40c are pulled out to the outside through a hole formed in the outer sheath 22 and the reinforcing plate 60 in a state of integration of the two conductors. Other configurations are the same as those of the heater device 1 of the first embodiment. In addition, in the state of integration of the two conductors, it is sufficient for the two conductors c1 and c2 to pass through a hole formed in the outer sheath 22 and the reinforcing plate 60, or the conductors c1 and c2 can pass through the same hole in an independent state, or the two conductors can pass through a single unit by being covered by an insulator. In addition, in this embodiment, the number of conductors is not limited to two. For example, in the case of having three or more conductors, it is still sufficient to pass through a hole formed in the outer sheath 22 and the reinforcing plate 60.

[0056] In this embodiment, the strength of the pull-out portion P can also be improved. That is, even when the power cable 40c is pulled, the pull-out portion P is reinforced by the reinforcing plate 60, thus preventing damage to the pull-out portion P. Furthermore, the reinforcing plate 60 is made of low-friction glass fiber sheet, fluororesin sheet, or fluororesin-processed sheet, thereby preventing friction with the conductors c1 and c2, preventing damage caused by wear of the reinforcing plate 60, and improving the overall durability of the pull-out portion P.

[0057] (Third Embodiment) Next, the third embodiment will be described with reference to FIG4. FIG4 is a cross-sectional view showing the structure of the heater device 300 of this embodiment. The heater device 300 of this embodiment has a reinforcing piece 60 provided on the pull-out portion P1 where the temperature sensor, i.e., the thermocouple 50, is pulled out from inside the heater body 10 to the outside of the outer sheath 22. The basic structure of the heater device 300 is the same as that of the first embodiment.

[0058] Thermocouple 50 is a temperature sensor used to detect the temperature of the object being heated, namely the piping 100. The thermocouple 50 has its front end, which detects the temperature, positioned on the piping 100 side of the object being heated. That is, the front end of the thermocouple 50 is positioned between the piping 100 and the inner sheath 20, or between the inner sheath 20 and the heating element 40. The thermocouple 50 is pulled out to the outside from its front end through the heater body 10. Figure 4 shows an example of a configuration where the front end of the thermocouple 50 is positioned between the piping 100 and the inner sheath 20, and is pulled out to the outside of the heater body 10 from the pull-out portion P1 within the heater body 10.

[0059] Thermocouple 50 has a sheath 50a into which thermocouple wires are encased, a conductor 50c connected to the thermocouple wires, and a sleeve 50b forming the connection between the thermocouple wires and the conductor 50c. The sleeve 50b can be disposed and fixed to the surface of the outer sheath 22. The sleeve 50b can be fixed to the outer sheath 22 by means of a suture 71 or the like. Alternatively, the sleeve 50b may not be fixed to the outer sheath 22. The sheath 50a, extending from the sleeve 50b, penetrates the reinforcing sheet 60, the outer sheath 22, the heat insulation material 30, the heating element 40, and the inner sheath 20, with its front end exposed on the piping (heating) side. The sheath 50a is bent at the point where it penetrates from the inner sheath 20 toward the piping side, and extends in a direction along the surface of the inner sheath 20 (piping 100). The front end of this protective sheath 50a can contact the piping 100 and detect temperature. The front end of the protective sheath 50a may or may not be in close contact with the inner sheath material 20. Alternatively, the front end may be fixed to the inner sheath material 20 with the same thread as the suture 60a, or it may not. A compensating wire can be used as the conductor 50c.

[0060] Furthermore, as described above, the sheath 50a of the thermocouple 50 is pulled out through a hole formed in the reinforcing plate 60 disposed in the pull-out portion P1. As long as the hole is formed in such a way that no gap is generated between the inner surface of the hole and the sheath 50a, the diameter of the hole formed in the reinforcing plate 60 and the sheath 50a are the same, and it can also be the slit-shaped hole described above.

[0061] The arrangement and handling method of the thermocouple 50 on the outer side of the pull-out portion P1 is not particularly limited. For example, the sheath 50a can be arranged along the surface of the reinforcing plate 60, and the sleeve 50b can be fixed and arranged on the outer sheath 22 adjacent to the outer side of the reinforcing plate 60. Alternatively, the thermocouple 50 can be arranged such that the sleeve 50b is arranged immediately after the sheath 50a is pulled out from the reinforcing plate 60, so that the sheath 50a protruding on the outer side of the outer sheath 22 is as small as possible. In this case, the sleeve 50b can be arranged overlapping the reinforcing plate 60, or the size and shape of the reinforcing plate 60 can be adjusted in a non-overlapping manner.

[0062] With the above configuration, similar to the case of the power cord 40c (wires c1, c2) in the first and second embodiments described above, damage to the pull-out portion P1 of the thermocouple 50 can be prevented. Furthermore, the reinforcing sheet 60 is constructed of low-friction glass fiber sheet, fluoropolymer sheet, or fluoropolymer-processed sheet, thereby preventing friction with the sheath 50a of the thermocouple 50. This prevents damage caused by wear of the reinforcing sheet 60, thereby improving the overall durability of the pull-out portion P1.

[0063] Furthermore, the temperature sensor is not limited to thermocouple 50; a resistance thermometer with the same structure as thermocouple 50 can also be used. In the resistance thermometer, the resistive element is housed within the sheath 50a, and the structure of the sleeve 50b and wires 50c is the same as in the thermocouple case. In the case of the resistance thermometer, damage to the pull-out portion P1 can also be prevented, and the durability of the pull-out portion P1 can be improved. [Simplified Explanation of the Diagram]

[0014] FIG1 is a perspective view showing the configuration of the heater device 1 installed in the cylindrical piping 100. FIG2 is a cross-sectional view showing the configuration of the heater device 1. FIG3 is a cross-sectional view showing the configuration of the heater device 200 in another embodiment. FIG4 is a cross-sectional view showing the configuration of the heater device 300 in another embodiment.

Claims

1. A heater device, characterized in that a heater body covers and heats an object to be heated; the heater body has at least an inner sheath, an outer sheath, and a heating element surrounded by the inner and outer sheaths in contact with the object to be heated; the heating element has a heater wire that heats up when energized, and a plurality of wires connected to the heater wire and supplied with power and covered by an insulator; a reinforcing plate is fixed in the outer sheath for pulling out the plurality of wires to the outside, the reinforcing plate being fixed to the outside of the outer sheath; the plurality of wires are pulled out to the outside through the outer sheath and the reinforcing plate.

2. The heater apparatus as described in claim 1, wherein, The aforementioned plurality of wires are pulled out to the outside in a separated state through the aforementioned outer sheath and the aforementioned reinforcing sheet.

3. The heater apparatus as described in claim 1, wherein, The aforementioned plurality of conductors, in their integrated state, are pulled out to the outside through the aforementioned outer sheath and the aforementioned reinforcing sheet.

4. A heater device, characterized in that a heater body covers and heats an object to be heated; the heater body has at least an inner skin, an outer skin, and a heating element surrounded by the inner and outer skins in contact with the object to be heated; the heater device has a temperature sensor for detecting the temperature of the object to be heated, the temperature sensor being a thermocouple or resistance thermometer pulled out from a pull-out portion of the outer skin via the heater body from a front end disposed on the object to be heated; a reinforcing plate is fixed to the pull-out portion in the outer skin, the reinforcing plate being fixed to the outside of the outer skin, and the thermocouple or resistance thermometer being pulled out to the outside via the outer skin and the reinforcing plate.

5. The heater apparatus as described in claim 1 or 4, wherein, The aforementioned reinforcing sheet is made of glass fiber sheet, fluoropolymer sheet, or fluoropolymer sheet.

6. The heater apparatus as described in claim 1 or 4, wherein, The aforementioned reinforcing sheet was stitched and fixed to the aforementioned outer skin material.

7. A method for manufacturing a heater device, characterized in that the heater device covers and heats an object to be heated by a heater body; the heater body has at least an inner sheath, an outer sheath, and a heating element surrounded by the inner and outer sheaths in contact with the object to be heated; the heating element has a heater wire that heats up by being energized, and a plurality of wires connected to the heater wire and supplied with power and covered by an insulator; the heater body has a reinforcing piece fixed in the outer sheath for the plurality of wires to be pulled out to the outside; the method for manufacturing the heater device includes the steps of fixing the reinforcing piece to the outside of the outer sheath and the plurality of wires passing through the outer sheath and the reinforcing piece.

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