Jacketed heater, manufacturing method of jacketed heater, and heating part

Abstract

A jacketed heater is provided that the cable of a thermocouple is not easily broken even when tensile force is applied to it, and the position of the temperature detection point is not easily shifted. The jacketed heater of the present invention is a jacketed heater used for installation on a heated body, comprising: an inner layer and an outer layer in contact with the heated body, a heating layer disposed between the inner layer and the outer layer, a heat insulation layer disposed between the heating layer and the outer layer, and a temperature sensor. The temperature sensor has a temperature detection point exposed on the inner surface of the inner layer and a cable portion extending from the temperature detection point. The inner surface is in contact with the heated body. The cable portion extends from the inner layer toward the outer layer, passing through the inner layer, the heating layer, the heat insulation layer, and the outer layer. In the interlayer between at least one of the adjacent layers, the portion from the outlet portion extending from one layer of the adjacent layer to the inlet portion extending into the other layer is arranged on a path that detours the straight path connecting the outlet portion and the inlet portion.

Description

Jacket Heater, Method for Manufacturing Jacket Heater, and Heating Unit The present invention relates to a jacket heater used by being installed on a body to be heated, a method for manufacturing the jacket heater, and a heating unit. In the manufacturing processes of semiconductor elements and FPDs (Flat Panel Displays), there are film-forming steps and etching steps using various process gases. It is known that by-products and exhaust gases are generated in these steps, and the by-products and exhaust gases solidify and precipitate inside the pipes used to discharge them. In order to suppress the solidification and precipitation of by-products and exhaust gases inside the pipes, a heater for heating the pipes is used on the pipes for discharging them. The heater installed on the pipes, also called a jacket heater (or a sheathed heater), heats the pipes in a state of contacting the outer surface of the pipes (for example, Patent Document 1). FIG. 9 is a perspective view of a conventional jacket heater 1000. As shown in FIG. 9, the jacket heater 1000 has an inner layer 1100 that contacts the body to be heated, that is, the pipe P, and an outer layer 1200 that constitutes the outermost layer of the jacket heater 1000. A heating layer 1300 is provided between the inner layer 1100 and the outer layer 1200, and the heating layer 1300 has a heating wire 1310 as a heat source; a heat insulation layer 1400 is provided between the outer layer 1200 and the heating layer 1300, and the heat insulation layer 1400 suppresses the heat generated from the heating layer 1300 from being released to the outside through the outer layer 1200. For the jacket heater 1000, power is supplied to the heating wire 1310 to heat the heating layer 1300, so as to heat the pipe P on which the jacket heater 1000 is installed. Among such jacket heaters, there is a jacket heater equipped with a thermocouple for detecting the temperature of the body to be heated. The jacket heater equipped with a thermocouple can be used by being connected to a power supply control mechanism (power supply control device) for controlling the power supply to the heating wire, and can adjust the temperature of the body to be heated based on the temperature of the body to be heated detected by the thermocouple. Thereby, the body to be heated is maintained within a desired temperature range. [Prior Art Documents] (Patent Documents) Patent Document 1: Japanese Patent Application Laid-Open No. 2002-295783 [Problems to be Solved by the Invention] A temperature sensor such as a thermocouple is a temperature sensor composed of a temperature detection point and a cable portion extending from the aforementioned temperature detection point, and transmits an electrical signal corresponding to the heat detected at the temperature detection point through the cable portion, thereby detecting the temperature of the measurement object. In a jacket heater using a temperature sensor, the temperature sensor is equipped with a cable portion such as a thermocouple. When the jacket heater is installed on an object to be heated and when maintenance and inspection are performed on the jacket heater, there is a problem that a tensile force is applied to the cable portion, resulting in disconnection of the cable portion. An object of the present invention is to provide a jacket heater in which, even when a tensile force is applied to a cable portion of a temperature sensor, the cable portion is not easily broken, and moreover, a positional deviation of a temperature detection point is not easily generated. [Technical Means for Solving the Problem] The gist of the present invention is as follows. [1] A jacket heater is a jacket heater used by being installed on a body to be heated, and includes: an inner layer contacting the body to be heated, an outer layer, a heating layer and a heat insulation layer disposed between the inner layer and the outer layer, and a temperature sensor. The temperature sensor includes a temperature detection point exposed on the inner surface of the inner layer and a cable portion extending from the temperature detection point. The inner surface contacts the body to be heated; the cable portion extends from the inner layer toward the outer layer, penetrates the inner layer, the heating layer, the heat insulation layer and the outer layer, and at least one adjacent layer among the inner layer, the heating layer, the heat insulation layer and the outer layer, the portion from the lead-out portion led out from one layer of the adjacent layers to the lead-in portion introduced into the other layer is disposed on a path that detours the straight path connecting the lead-out portion and the lead-in portion. [2] In the jacket heater described in [1], the heat insulation layer is composed of a first heat insulation layer disposed between the heating layer and the outer layer and a second heat insulation layer disposed between the first heat insulation layer and the outer layer side; the cable portion, in at least one adjacent layer among the inner layer, the heating layer, the first heat insulation layer, the second heat insulation layer and the outer layer, the portion from the lead-out portion led out from one layer of the adjacent layers to the lead-in portion introduced into the other layer is disposed on a path that detours the straight path connecting the lead-out portion and the lead-in portion. [3] A jacket heater is a jacket heater used by being installed on a body to be heated, and includes: an inner layer contacting the body to be heated, an outer layer, a heating layer and a heat insulation layer disposed between the inner layer and the outer layer, and a temperature sensor. The temperature sensor includes a temperature detection point located between the inner layer and the heating layer and a cable portion extending from the temperature detection point; the cable portion extends from between the inner layer and the heating layer toward the outer layer, penetrates the heating layer, the heat insulation layer and the outer layer, and at least one adjacent layer among the heating layer, the heat insulation layer and the outer layer, the portion from the lead-out portion led out from one layer of the adjacent layers to the lead-in portion introduced into the other layer is disposed on a path that detours the straight path connecting the lead-out portion and the lead-in portion. [4] In the jacket heater described in [3], the heat insulation layer is composed of a first heat insulation layer disposed between the heating layer and the outer layer and a second heat insulation layer disposed between the first heat insulation layer and the outer layer side; the cable portion, in at least one adjacent layer among the heating layer, the first heat insulation layer, the second heat insulation layer and the outer layer, the portion from the lead-out portion led out from one layer of the adjacent layers to the lead-in portion introduced into the other layer is disposed on a path that detours the straight path connecting the lead-out portion and the lead-in portion.[5]In the jacket heater described in [1] or [3], the cable portion, which is located at the portion between the outer layer and the heat insulation layer, is arranged on a path that detours the straight path connecting the lead-out portion and the lead-in portion. [6]In the jacket heater described in [1] or [3], the heating layer has a heating wire as a heat source; the heating cable connected to the heating wire penetrates the heat insulation layer and the outer layer from the heating layer toward the outer layer, and at least one adjacent layer among the heating layer, the heat insulation layer, and the outer layer, the portion from the lead-out portion led out from one of the adjacent layers to the lead-in portion introduced into the other layer is arranged on a path that detours the straight path connecting the lead-out portion and the lead-in portion. [7]In the jacket heater described in [6], the heat insulation layer is composed of a first heat insulation layer provided between the heating layer and the outer layer and a second heat insulation layer provided between the first heat insulation layer and the outer layer side; the heating cable, at least one adjacent layer among the heating layer, the first heat insulation layer, the second heat insulation layer, and the outer layer, the portion from the lead-out portion led out from one of the adjacent layers to the lead-in portion introduced into the other layer is arranged on a path that detours the straight path connecting the lead-out portion and the lead-in portion. [8]In the jacket heater described in [1] or [3], the temperature sensor is a thermocouple or a resistance thermometer. [9]In the jacket heater described in [1], the heating layer has a heating wire as a heat source; the temperature detection point of the temperature sensor is set at a position where it does not overlap with the heating wire in the direction perpendicular to the contact surface between the heated body and the inner layer.

[10] In the jacket heater described in [9], the temperature sensor, all parts of which are exposed on the inner surface of the inner layer, are set at positions where they do not overlap with the heating wire in the direction perpendicular to the contact surface.

[11] In the jacket heater described in [3], the heating layer has a heating wire as a heat source; the temperature detection point of the temperature sensor is set at a position where it does not overlap with the heating wire in the direction perpendicular to the contact surface between the heated body and the inner layer.

[12] In the jacket heater described in

[11] , the temperature sensor, all parts of which are located between the inner layer and the heating layer, are set at positions where they do not overlap with the heating wire in the direction perpendicular to the contact surface.

[13] In the jacket heater described in [1] or [3], the heating layer has a heating wire as a heat source; the jacket heater further has a temperature controller; the temperature detection point of the temperature controller is set at a position where it does not overlap with the heating wire in the direction perpendicular to the contact surface between the heated body and the inner layer.

[14] In the jacket heater described in

[13] , the electric heating wire extends while being folded back in the heat generating layer in a manner arranged in a specified direction, and the thermostat is arranged to be surrounded by the folded-back portion of the electric heating wire.

[15] In the jacket heater described in [1] or [3], the jacket heater further includes a thermostat; the heat insulating layer is formed along the outer shape of the thermostat and has a housing portion to form a housing space for the thermostat.

[16] In the jacket heater described in

[15] , the housing portion is a through hole penetrating the heat insulating layer.

[17] In the jacket heater described in

[15] , the housing portion is a recess opening toward the object to be heated.

[18] In the jacket heater described in

[15] , the heat generating layer has an electric heating wire as a heat source; the electric heating wire is arranged on the surface of the heat insulating layer along a specified arrangement pattern; a part of the electric heating wire is arranged along the housing portion at a position separated from the housing portion by a specified distance.

[19] In the jacket heater described in

[15] , the heat generating layer has an electric heating wire as a heat source and a support body fixing the electric heating wire; the support body has an opening portion through which the thermostat penetrates; a flange portion provided on the thermostat is mounted on the support body.

[20] In the jacket heater described in

[19] , the support body is an inorganic fiber sheet; the edge of the opening portion is sewn with a reinforcing wire.

[21] A manufacturing method of a jacket heater, the jacket heater is installed on an object to be heated and used and is a laminate, the laminate includes an inner layer contacting the object to be heated, an outer layer, and a heat generating layer and a heat insulating layer provided between the inner layer and the outer layer; the manufacturing method has a step of forming a laminate in which a temperature sensor is fixed, the temperature sensor includes a temperature detection point and a cable portion extending from the temperature detection point; the temperature detection point is arranged to be exposed on the inner surface of the inner layer; the cable portion extends from the inner layer toward the outer layer, penetrates the inner layer, the heat generating layer, the heat insulating layer, and the outer layer, and in at least one adjacent layer interface among the inner layer, the heat generating layer, the heat insulating layer, and the outer layer, the portion from the lead-out portion led out from one layer of the adjacent layers to the lead-in portion introduced into the other layer is arranged on a path that detours the straight path connecting the lead-out portion and the lead-in portion.

[22] A manufacturing method of a jacket heater, the jacket heater is installed on a heated body and is a laminate, the laminate includes an inner layer contacting the aforementioned heated body, an outer layer, a heating layer and a heat insulation layer disposed between the aforementioned inner layer and the aforementioned outer layer; the manufacturing method has a step of forming a laminate, the laminate is fixed with a temperature sensor, the temperature sensor is provided with a temperature detection point and a cable portion extending from the aforementioned temperature detection point; the aforementioned temperature detection point is disposed between the aforementioned inner layer and the aforementioned heating layer; the aforementioned cable portion extends from between the aforementioned inner layer and the aforementioned heating layer toward the aforementioned outer layer, penetrates the aforementioned heating layer, the aforementioned heat insulation layer and the aforementioned outer layer, and in at least one adjacent layer between the aforementioned heating layer, the aforementioned heat insulation layer and the aforementioned outer layer, the portion from the lead-out portion led out from one layer of the adjacent layers to the lead-in portion led into the other layer is disposed on a path that detours the straight path connecting the aforementioned lead-out portion and the aforementioned lead-in portion.

[23] A heating part is a heating part that covers a pipe to heat the inside of the aforementioned pipe, and has: an inner layer contacting the heated body, an outer layer, a heating layer and a heat insulation layer disposed between the aforementioned inner layer and the aforementioned outer layer, and a temperature sensor, the temperature sensor is provided with a temperature detection point exposed on the inner surface of the aforementioned inner layer and a cable portion extending from the aforementioned temperature detection point, the inner surface contacts the aforementioned heated body; the aforementioned cable portion extends from the aforementioned inner layer toward the aforementioned outer layer, penetrates the aforementioned inner layer, the aforementioned heating layer, the aforementioned heat insulation layer and the aforementioned outer layer, and in at least one adjacent layer between the aforementioned inner layer, the aforementioned heating layer, the aforementioned heat insulation layer and the aforementioned outer layer, the portion from the lead-out portion led out from one layer of the adjacent layers to the lead-in portion led into the other layer is disposed on a path that detours the straight path connecting the aforementioned lead-out portion and the aforementioned lead-in portion.

[24] A heating part is a heating part that covers a pipe to heat the inside of the aforementioned pipe, and has: an inner layer contacting the heated body, an outer layer, a heating layer and a heat insulation layer disposed between the aforementioned inner layer and the aforementioned outer layer, and a temperature sensor, the temperature sensor is provided with a temperature detection point located between the aforementioned inner layer and the aforementioned heating layer and a cable portion extending from the aforementioned temperature detection point; the aforementioned cable portion extends from between the aforementioned inner layer and the aforementioned heating layer toward the aforementioned outer layer, penetrates the aforementioned heating layer, the aforementioned heat insulation layer and the aforementioned outer layer, and in at least one adjacent layer between the aforementioned heating layer, the aforementioned heat insulation layer and the aforementioned outer layer, the portion from the lead-out portion led out from one layer of the adjacent layers to the lead-in portion led into the other layer is disposed on a path that detours the straight path connecting the aforementioned lead-out portion and the aforementioned lead-in portion. [Advantages of the Invention] According to the present invention, a jacket heater can be provided, even if a tensile force is applied to the cable portion of the temperature sensor, the cable portion is not easily broken, and moreover, the position shift of the temperature detection point is not easily generated. [First Embodiment] Hereinafter, the first embodiment of the present invention will be described with reference to FIGS. 1 to 4. In addition, in the embodiments shown below, the jacket heater 100 is described, but the present invention is not limited to the jacket heater 100 as long as it can cover the pipe and heat the heating part inside the pipe. As shown in FIG. 1, the jacket heater 100 of this embodiment has an inner layer 110 and an outer layer 120. The inner layer 110 is the innermost layer that constitutes the jacket heater 100 and is in contact with the object to be heated, that is, the pipe P. The outer layer 120 is the outermost layer that constitutes the jacket heater 100. A heating layer 130 is provided between the inner layer 110 and the outer layer 120, and a heat insulation layer 140 is provided between the heating layer 130 and the outer layer 120. The heating layer 130 has a heat source and generates heat by the heat from the heat source. The heat insulation layer 140 suppresses the heat generated in the heating layer 130 from being radiated to the outside through the outer layer 120. In addition, as long as the heating layer 130 and the heat insulation layer 140 are provided between the inner layer 110 and the outer layer 120, it is not limited to the form shown in FIG. 1. Inside the jacket heater 100, a housing space for housing the object to be heated, that is, the pipe P, is formed. In such a manner that the pipe P can be housed in the housing space, a slit S extending from the outer surface of the jacket heater 100 to the housing space is provided in the jacket heater 100. The jacket heater 100 houses the pipe P in the housing space through the slit S and is installed by being fixed to the pipe P using fixing means such as a belt (not shown). The inner layer 110 and the outer layer 120 only need to be made of materials that can withstand the heat transferred from the heating layer 130, and there is no particular limitation on such materials. For example, a fluororesin sheet made of a fluororesin such as PTFE (Polytetrafluoroethylene), PFA (Polyfluoroalkoxy), FEP (Fluorinated ethylene propylene), PCTFE (Polychlorotrifluroethylene), ETFE (Ethylene-tetra-fluoro-ethylene), ECTFE (Ethylene-chlorotrifluororthylene polymer), PVDF (Polyvinylidene difluoride), etc. can be used; or a fluororesin fiber fabric (woven fabric) made by weaving the fibers of the aforementioned fluororesin; an inorganic fiber fabric (woven fabric) made of inorganic fibers such as glass fiber, silica fiber, alumina fiber, and silica alumina fiber; a fluororesin-coated inorganic fiber fabric obtained by coating the aforementioned inorganic fiber fabric with the aforementioned fluororesin, and a silicone resin-coated inorganic fiber fabric obtained by coating the aforementioned inorganic fiber fabric with silicone resin. In addition, the inner layer 110 and the outer layer 120 can also be made of materials other than the aforementioned fluororesins. For example, they can be made of polyamide, polycarbonate, polyacetal, polybutylene terephthalate, modified polyphenylene ether, polyphenylene sulfide, polysulfone, polyethersulfone, polyarylate, polyetheretherketone, polyphthalamide, polyimide, polyetherimide, and poly-4-methyl-1-pentene. The heating layer 130 has a heat source. As the heat source, as shown in FIG. 1, a heating wire 131 can be used. A heating cable 131C is connected to the heating wire 131, and it penetrates the heat insulation layer 140 and the outer layer 120 from the heating layer 130 toward the outer layer 120, and a part including the end is exposed from the outer surface of the outer layer 120. The heating wire 131 is heated by being supplied with electricity via the heating cable 131C. The heating wire 131 in the heating layer 130 only needs to be a wire that is supplied with electricity to generate heat, and there is no particular limitation. Nickel-chromium alloy wires and stainless steel wires, etc. can be used. The heating wire 131 is preferably electrically insulated to prevent electric leakage. The insulation of the heating wire 131 can be achieved by covering the heating wire 131 with a sleeve made of inorganic fibers or by coating the heating wire 131 with resin. The sleeve made of inorganic fibers is composed of inorganic fibers such as glass fiber, silicon oxide fiber, aluminum oxide fiber, and silicon oxide aluminum oxide fiber. The heating layer 130 may have a support 132 in addition to the heat source (heating wire 131). The support 132 is a material for fixing (supporting) the heating wire 131. For example, an inorganic fiber fabric composed of inorganic fibers such as glass fiber, silicon oxide fiber, aluminum oxide fiber, and silicon oxide aluminum oxide fiber can be used. The heating wire 131 can be fixed to the support 132, for example, by sewing the heating wire 131 to the support 132 with a heat-resistant thread. The heat insulation layer 140 may be made of any material that can inhibit the heat generated from the self-heating layer 130 from radiating to the outside through the outer layer 120, and is not particularly limited. For example, an inorganic fiber mat formed by integrating glass fiber, ceramic fiber, silicon oxide fiber, etc. and performing needle processing can be used. In addition, the inorganic fiber mat can be further added with inorganic binders such as colloidal silicon oxide and aluminum oxide colloidal solution, sodium silicate, and organic binders such as starch, and formed into a mat shape. Also, the heat insulation layer 140 may be a porous molded body made of heat-resistant organic resins such as aramid, polyamide, and polyimide. The thickness of the material having such heat insulation properties is preferably 5 to 100 mm, more preferably 5 to 50 mm, and even more preferably 8 to 30 mm. In addition to the above materials, a fiber body filled with aerogel (aerogel fiber body) can be used in the heat insulation layer 140. The aerogel fiber body is a heat insulation material formed by filling aerogel in a fiber substrate. For example, the aerogel fiber body described in International Publication No. 2012 / 077648 can be used. Figure 2 is a cross-sectional view taken along the line A-A' of the jacket heater 100 shown in Figure 1. As shown in Figure 2, the jacket heater 100 of the present embodiment has a temperature sensor 150. The temperature sensor 150 is composed of a temperature detection point 151 for detecting the temperature of the object to be measured and a cable portion 152 extending from the temperature detection point 151, and transmits an electrical signal corresponding to the heat detected at the temperature detection point 151 through the cable portion 152, thereby detecting the temperature of the object to be measured. Examples of the temperature sensor 150 include a thermocouple and a resistance thermometer. The temperature detection point 151 in the temperature sensor 150 and a part of the cable portion 152 connected to the temperature detection point 151 are exposed on the inner surface of the inner layer 110 (in contact with the surface of the pipe P) and fixed. Among the cable portion 152, the portion excluding the part exposed on the inner surface of the inner layer 110 penetrates from the inner layer 110 to the outer layer 120 through the inner layer 110, the heating layer 130, the heat insulation layer 140, and the outer layer 120, and a part of the end portion is exposed and fixed on the outer surface of the outer layer 120. There is no particular limitation on the fixing method of the cable portion 152 on the inner surface of the inner layer 110 and the outer surface of the outer layer 120. For example, a method of sewing the cable portion 152 to the inner surface of the inner layer 110 and the outer surface of the outer layer 120 with heat-resistant sewing threads can be used. Among the cable portion 152, the part penetrating the inner layer 110, the heating layer 130, the heat insulation layer 140, and the outer layer 120 (the part not exposed on the inner surface of the inner layer 110 and the outer surface of the outer layer 120) is led out from the heat insulation layer 140 to the position between the heat insulation layer 140 and the outer layer 120, that is, the heat insulation layer lead-out portion 152a, and led into the outer layer 120 from the position between the heat insulation layer 140 and the outer layer 120, that is, the outer layer introduction portion 152b. In the jacket heater 100 of the present embodiment, the portion from the heat insulation layer lead-out portion 152a to the outer layer introduction portion 152b is arranged on a detour path that detours the straight path connecting the heat insulation layer lead-out portion 152a and the outer layer introduction portion 152b, as shown in FIG. 2. In other words, in the jacket heater 100 of the present embodiment, for the portion of the cable portion 152 located between the heat insulation layer 140 and the outer layer 120, it is arranged on a detour path that detours the heat insulation layer lead-out portion 152a and the outer layer introduction portion 152b. The detour path arranged with the portion from the heat insulation layer lead-out portion 152a to the outer layer introduction portion 152b (the portion of the cable portion 152 located between the heat insulation layer 140 and the outer layer 120) is specifically a path that extends in the direction of the arrow mark D1 from the heat insulation layer lead-out portion 152a, bends and extends in the direction of the arrow mark D2 perpendicular to the arrow mark D1, and further bends and extends in the direction of the arrow mark D3 perpendicular to the direction of the arrow mark D2 and parallel to the direction of the arrow mark D1 until the outer layer introduction portion 152b. As in the directions of the arrow marks D1 to D3, a path extending in a direction forming a specified angle with respect to the straight line direction (D direction) connecting the heat insulation layer lead-out portion 152a and the outer layer introduction portion 152b is included in the detour path, whereby the detour path becomes a path that detours the straight path connecting the heat insulation layer lead-out portion 152a and the outer layer introduction portion 152b. In addition, the detour path only needs to be a path that detours the straight path connecting the heat insulation layer lead-out portion 152a and the outer layer introduction portion 152b, and is not limited to the detour path shown in FIG. 2. The portion of the self-insulation layer lead-out part 152a to the outer layer lead-in part 152b disposed on the detour path can also be fixed to the insulation layer 140 (the outer surface of the insulation layer 140 (the surface in contact with the outer layer 120)) and the outer layer 120 (the inner surface of the outer layer 120 (the surface in contact with the insulation layer 140)). There is no particular limitation on the fixing method of the insulation layer 140 and the outer layer 120. For example, a method can be used in which the portion from the self-insulation layer lead-out part 152a to the outer layer lead-in part 152b is sewn to the insulation layer 140 and the outer layer 120 with heat-resistant sewing threads. In addition, the cable part 152 can also be directly sewn to the sewing layer. However, in order to easily fix the cable part 152, an inorganic fiber fabric such as a glass fiber fabric can be abutted on the surface of the sewing layer, and the cable part 152 can be sewn隔着该玻璃纤维布料来缝合缆线部152。又,也可以由玻璃纤维布料来覆盖已缝合于层上的缆线部152,进一步将该玻璃纤维布料缝合于已缝合有缆线部152之层。 In the jacket heater 100 of this embodiment, the portion of the cable part 152 from the self-insulation layer lead-out part 152a to the outer layer lead-in part 152b (the portion of the cable part 152 located between the insulation layer 140 and the outer layer 120) is disposed on a detour path that detours the straight path connecting the insulation layer lead-out part 152a and the outer layer lead-in part 152b. Therefore, slack is generated between the insulation layer lead-out part 152a and the outer layer lead-in part 152b. Thus, even if a tensile force is applied to the cable part 152 exposed from the outer surface of the outer layer 120 until the slack between the insulation layer lead-out part 152a and the outer layer lead-in part 152b is released (until the portion from the self-insulation layer lead-out part 152a to the outer layer lead-in part 152b is disposed on the straight path connecting the insulation layer lead-out part 152a and the outer layer lead-in part 152b), as shown in FIG. 3, only the length of the cable part 152 exposed from the outer surface of the outer layer 120 becomes longer, and an excessive tensile force will not be applied to the cable part 152. Therefore, in the jacket heater 100 of this embodiment, even if a tensile force is applied to the cable part 152, the cable part 152 is not easily broken. In addition, in this specification, the disconnection of the cable part 152 includes not only the disconnection of the cable part 152 itself but also the concept of the disconnection of the core wire (conductive wire) housed inside the cable part 152. Further, as shown in FIG. 3, even when a tensile force is applied to the cable portion 152 exposed on the outer surface of the outer layer 120, so that the length of the cable portion 152 exposed on the outer surface of the outer layer 120 becomes longer until the slack between the heat insulation layer lead-out portion 152a and the outer layer lead-in portion 152b is released, only the position of the outer layer lead-in portion 152b in the cable portion 152 changes, and the position of the heat insulation layer lead-out portion 152a in the cable portion 152 hardly changes. Therefore, in the jacket heater 100 of the present embodiment, the tensile force is not easily transmitted from the heat insulation layer lead-out portion 152a to the temperature detection point 151 in the cable portion 152, so the position shift of the temperature detection point 151 is not easily generated. In this way, in the jacket heater 100 of the present embodiment, slack is generated in the portion of the cable portion 152 disposed on the detour path from the heat insulation layer lead-out portion 152a to the outer layer lead-in portion 152b. Therefore, even when a tensile force is applied to the cable portion 152 exposed on the outer surface of the outer layer 120, the portion from the heat insulation layer lead-out portion 152a to the outer layer lead-in portion 152b where slack is generated functions as a buffer portion. Therefore, the cable portion 152 is not easily broken, and the position shift of the temperature detection point 151 is not easily generated. Next, FIG. 4 is used to illustrate the usage method of the jacket heater 100 of the present embodiment. FIG. 4 is a developed view of the jacket heater 100 viewed from the outer layer 120 side. The jacket heater 100 of the present embodiment, as shown in FIG. 4, can be used by being connected to a power supply control device connected to an external power supply. More specifically, the jacket heater 100 can be used by being connected to the power supply control device via the electric heating cable 131C connected to the heating wire 131 and the cable portion 152 of the temperature sensor 150. The power supply control device supplies power to the heating wire 131 via the electric heating cable 131C. By supplying power to the heating wire 131, the heating wire 131 is heated. Further, the power supply control device receives the thermoelectromotive force caused by heat (temperature difference) transmitted via the cable portion 152 of the temperature sensor 150, and determines whether the temperature of the measurement object (pipe P) obtained from the thermoelectromotive force is within a specified range. When it is determined that the temperature of the measurement object is within the specified range, the power supply control device performs power supply control on the heating wire 131 to maintain the temperature of the object to be heated at that temperature. On the other hand, when it is determined that the temperature of the measurement object (pipe P) is higher than the specified range, the power supply control device performs power supply control on the heating wire 131 to make the temperature of the object to be heated (pipe P) lower than that temperature; when it is determined that the temperature of the measurement object (pipe P) is lower than the specified range, the power supply control device performs power supply control on the heating wire 131 to make the temperature of the object to be heated (pipe P) higher than that temperature. The jacket heater 100 of the present embodiment is used by being connected to the above-mentioned power supply control device, whereby the temperature of the object to be heated can be adjusted while detecting the temperature of the object to be heated, and thus the object to be heated can be maintained within a desired temperature range. In addition, the power supply control performed by the power supply control device is not limited to the above-mentioned power supply control, and previously known power supply control can also be used. In the jacket heater 100 of the present embodiment, in addition to the cable portion 152 of the temperature sensor 150, the electric heating cable 131C connected to the heating wire 131 may also be arranged on a detour path. That is, the electric heating cable 131C connected to the heating wire 131 may extend from the heat generating layer 130 toward the outer layer 120, penetrate the heat insulating layer 140 and the outer layer 120, and at least between adjacent layers of the heat generating layer 130, the heat insulating layer 140, and the outer layer 120, the portion from the lead-out portion led out from one of the adjacent layers to the lead-in portion led into the other layer is arranged on a path that detours the straight path connecting the lead-out portion and the lead-in portion. In this case, the portion of the electric heating cable 131C from the lead-out portion to the lead-in portion is arranged on a path that detours the straight path connecting the lead-out portion and the lead-in portion, so slack is generated in the portion between the lead-out portion and the lead-in portion. Therefore, the electric heating cable 131C is not easily broken, and the heating wire 131 is not easily displaced. In addition, the cable portion 152 of the temperature sensor 150 may pass through the through-hole formed in the heat insulating layer 140 and the outer layer 120 through which the electric heating cable 131C of the heating wire 131 passes, or may pass through a through-hole different from the through-hole through which the electric heating cable 131C of the heating wire 131 passes (the through-hole formed in the heat insulating layer 140 and the outer layer 120). The jacket heater 100 of the present embodiment is a laminate including an inner layer 110, an outer layer 120, a heat generating layer 130, and a heat insulating layer 140 provided between the inner layer 110 and the outer layer 120; it can be manufactured by a method including the step of forming the laminate, and the temperature sensor 150 is fixed to the laminate. The temperature sensor 150 includes a temperature detection point 151 and a cable portion extending from the temperature detection point 151. In the step of forming the laminate, the temperature detection point 151 is provided on the inner surface of the inner layer 110. Also, in the step of forming the laminate, the cable portion 152 extends from the inner layer 110 toward the outer layer 120, penetrates the inner layer 110, the heat generating layer 130, the heat insulating layer 140, and the outer layer 120, and at least between adjacent layers of the inner layer 110, the heat generating layer 130, the heat insulating layer 140, and the outer layer 120, the portion from the lead-out portion led out from one of the adjacent layers to the lead-in portion led into the other layer is arranged on a path that detours the straight path connecting the lead-out portion and the lead-in portion. Hereinafter, a modification example of the jacket heater 100 according to the present embodiment will be described. In addition, in each modification example, the same reference numerals are given to the structures that are the same as those of the jacket heater 100 according to the present embodiment, and detailed descriptions thereof are omitted. [Modification Example 1 of the First Embodiment] In the jacket heater 100 according to the present embodiment shown in FIGS. 1 to 4, the heat insulation layer lead-out portion 152a and the outer layer introduction portion 152b of the cable portion 152 are provided at positions that do not overlap in the stacking direction of the inner layer 110, the heating layer 130, the heat insulation layer 140, and the outer layer 120 (particularly refer to FIGS. 2 to 4). In the jacket heater of this modification example 1, as shown in FIG. 5, the heat insulation layer lead-out portion 152a and the outer layer introduction portion 152b are provided at positions that overlap in the stacking direction. Even in such a jacket heater 100, as long as the portion from the heat insulation layer lead-out portion 152a to the outer layer introduction portion 152b (the portion of the cable portion 152 located between the heat insulation layer 140 and the outer layer 120) is arranged on a detour path that detours the straight path connecting the heat insulation layer lead-out portion 152a and the outer layer introduction portion 152b, slack can be generated between the heat insulation layer lead-out portion 152a and the outer layer introduction portion 152b. Therefore, the portion from the heat insulation layer lead-out portion 152a to the outer layer introduction portion 152b functions as a buffer portion. Therefore, even in the jacket heater 100 of this modification example 1, the cable portion 152 is not easily broken, and the temperature detection point 151 is not easily displaced. [Modification Example 2 of the First Embodiment] In the jacket heater 100 according to the present embodiment shown in FIGS. 1 to 4, between the heat insulation layer 140 and the outer layer 120, the portion of the cable portion 152 from the heat insulation layer lead-out portion 152a to the outer layer introduction portion 152b (the portion of the cable portion 152 located between the heat insulation layer 140 and the outer layer 120) is arranged on a detour path that detours the straight path connecting the heat insulation layer lead-out portion 152a and the outer layer introduction portion 152b. In the jacket heater of this modification example 2, as shown in FIG. 6, between the heating layer 130 and the heat insulation layer 140, the portion from the heating layer lead-out portion 152c to the heat insulation layer introduction portion 152d is arranged on a detour path that detours the straight path connecting the heating layer lead-out portion 152c and the heat insulation layer introduction portion 152d. In other words, in the jacket heater 100 of this modification example 2, the portion of the cable portion 152 located between the heating layer 130 and the heat insulation layer 140 is arranged on a detour path that detours the straight path connecting the heating layer lead-out portion 152c and the heat insulation layer introduction portion 152d. In addition, the heating layer lead-out portion 152c is the portion led out from the heating layer 130 to between the heating layer 130 and the heat insulation layer 140; the heat insulation layer introduction portion 152d is the portion led into the heat insulation layer 140 from between the heating layer 130 and the heat insulation layer 140. Even in the jacket heater 100 of this second modification example, the portion of the cable part 152 from the self-heating layer lead-out part 152c to the heat insulation layer introduction part 152d (the portion located between the heating layer 130 and the heat insulation layer 140) is arranged on a detour path that detours the straight path connecting the self-heating layer lead-out part 152c and the heat insulation layer introduction part 152d. Therefore, slack is generated in the portion between the self-heating layer lead-out part 152c and the heat insulation layer introduction part 152d. Thus, the portion from the self-heating layer lead-out part 152c to the heat insulation layer introduction part 152d functions as a buffer part. Therefore, even in the jacket heater 100 of this second modification example, the cable part 152 is not easily broken, and the temperature detection point 151 is not easily displaced in position. [Modification Example 3 of the First Embodiment] In the jacket heater 100 of this embodiment shown in FIGS. 1 to 4, the portion of the cable part 152 from the heat insulation layer lead-out part 152a to the outer layer introduction part 152b (the portion of the cable part 152 located between the heat insulation layer 140 and the outer layer 120) is arranged on a detour path that detours the straight path connecting the heat insulation layer lead-out part 152a and the outer layer introduction part 152b. In the jacket heater of this modification example 3, as shown in FIG. 7, the portion from the inner layer lead-out part 152e to the heating layer introduction part 152f is arranged on a detour path that detours the straight path connecting the inner layer lead-out part 152e and the heating layer introduction part 152f between the inner layer 110 and the heating layer 130. In other words, in the jacket heater 100 of this modification example 3, the portion of the cable part 152 located between the inner layer 110 and the heating layer 130 is arranged on a detour path that detours the straight path connecting the inner layer lead-out part 152e and the heating layer introduction part 152f. Further, the inner layer lead-out part 152e is the portion led out from the inner layer 110 to between the inner layer 110 and the heating layer 130; the heating layer introduction part 152f is the portion introduced from between the inner layer 110 and the heating layer 130 to the heating layer 130. Even in the jacket heater 100 of this modification example 3, the portion of the cable part 152 from the inner layer lead-out part 152e to the heating layer introduction part 152f (the portion located between the inner layer 110 and the heating layer 130) is arranged on a detour path that detours the straight path connecting the inner layer lead-out part 152e and the heating layer introduction part 152f. Therefore, slack is generated in the portion between the inner layer lead-out part 152e and the heating layer introduction part 152f. Thus, the portion from the inner layer lead-out part 152e to the heating layer introduction part 152f functions as a buffer part. Therefore, even in the jacket heater 100 of this modification example 3, the cable part 152 is not easily broken, and the temperature detection point 151 is not easily displaced in position. [Modification Example 4 of the First Embodiment] In the jacket heater 100 shown in FIGS. 1 to 7, any one of the portions from the heat insulation layer lead-out portion 152a to the outer layer lead-in portion 152b in the cable portion 152 (the portion located between the heat insulation layer 140 and the outer layer 120), the portion from the heating layer lead-out portion 152c to the heat insulation layer lead-in portion 152d (the portion located between the heating layer 130 and the heat insulation layer 140), and the portion from the inner layer lead-out portion 152e to the heating layer lead-in portion 152f (the portion located between the inner layer 110 and the heating layer 130) is arranged on the detour path. In the jacket heater of this modification example 4, two or more of these portions are arranged on the detour path (not shown). As described above, since the portions of the cable portion 152 arranged on the detour path become slack, slack occurs at two or more of the portions arranged on the detour path. This slack functions as a buffer portion. Therefore, even in the jacket heater 100 of this modification example 4, two or more of the portions from the heat insulation layer lead-out portion 152a to the outer layer lead-in portion 152b (the portion located between the heat insulation layer 140 and the outer layer 120), the portion from the heating layer lead-out portion 152c to the heat insulation layer lead-in portion 152d (the portion located between the heating layer 130 and the heat insulation layer 140), and the portion from the inner layer lead-out portion 152e to the heating layer lead-in portion 152f (the portion located between the inner layer 110 and the heating layer 130) are arranged on the detour path. Thus, in the jacket heater 100 of this modification example 4, the cable portion 152 is less likely to break, and the temperature detection point 151 is less likely to shift in position. [Variation Example 5 of the First Embodiment] In the jacket heater 100 shown in FIGS. 1 to 7, the heat insulation layer 140 is composed of one layer, while the jacket heater 100 of this variation example 5 is composed of two layers of the heat insulation layer 140. More specifically, the jacket heater 100 of this variation example 5 is composed of two heat insulation layers 140, namely, the first heat insulation layer and the second heat insulation layer (not shown). The first heat insulation layer is provided between the heating layer 130 and the outer layer 120, and the second heat insulation layer is provided between the first heat insulation layer and the outer layer 120. Furthermore, between the layers of the first heat insulation layer and the second heat insulation layer, the portion of the cable part 152 from the first heat insulation layer lead-out part to the second heat insulation layer introduction part is arranged on a detour path that detours the straight path connecting the first heat insulation layer lead-out part and the second heat insulation layer introduction part (not shown). In other words, in the jacket heater 100 of this variation example 5, the portion of the cable part 152 located between the first heat insulation layer and the second heat insulation layer is arranged on a detour path that detours the straight path connecting the first heat insulation layer lead-out part and the second heat insulation layer introduction part. In addition, the first heat insulation layer lead-out part is the part that leads out from the first heat insulation layer to between the first heat insulation layer and the second heat insulation layer; the second heat insulation layer introduction part is the part that leads into the second heat insulation layer from between the first heat insulation layer and the second heat insulation layer. Even in the jacket heater 100 of this variation example 5, the portion of the cable part 152 from the first heat insulation layer lead-out part to the second heat insulation layer introduction part (the portion located between the first heat insulation layer and the second heat insulation layer) is arranged on a detour path that detours the straight path connecting the first heat insulation layer lead-out part and the second heat insulation layer introduction part, so slack is generated between the first heat insulation layer lead-out part and the second heat insulation layer introduction part. Therefore, the portion from the first heat insulation layer lead-out part to the second heat insulation layer introduction part functions as a buffer part. So even in the jacket heater 100 of this variation example 5, the cable part 152 is not easily broken, and the temperature detection point 151 is not easily displaced. In addition, in this variation example 5, the part of the cable part 152 arranged on the detour path is located between the first heat insulation layer and the second heat insulation layer, but it can also be located between the second heat insulation layer and the outer layer 120, between the first heat insulation layer and the heating layer 130, and between the inner layer 110 and the heating layer 130. [Variation Example 6 of the First Embodiment] In the jacket heater 100 shown in FIGS. 1 to 7, the temperature detection point 151 of the temperature sensor 150 is exposed on the inner surface of the inner layer 110. In the jacket heater 100 of this variation example 6, as shown in FIG. 8, the temperature detection point 151 of the temperature sensor 150 is located between the inner layer 110 and the heating layer 130. Further, a part of the cable portion 152 extending from the temperature detection point 151 is fixed between the inner layer 110 and the heating layer 130. After excluding the portion to be fixed between the inner layer 110 and the heating layer 130, the remaining portion penetrates the heating layer 130, the heat insulation layer 140, and the outer layer 120 from between the inner layer 110 and the heating layer 130 toward the outer layer 120, and a part of the end portion is exposed and fixed on the outer surface of the outer layer 120. Even in the jacket heater 100 of this variation example 6, the portion from the heat insulation layer lead-out portion 152a to the outer layer lead-in portion 152b (the portion located between the heat insulation layer 140 and the outer layer 120) is arranged on a detour path that detours the straight path connecting the heat insulation layer lead-out portion 152a and the outer layer lead-in portion 152b, so slack is generated. Therefore, the portion from the heat insulation layer lead-out portion 152a to the outer layer lead-in portion 152b functions as a buffer portion. Thus, even in the jacket heater 100 of this variation example 6, the cable portion 152 is not easily broken, and the temperature detection point 151 is not easily displaced. In addition, in this variation example 6 shown in FIG. 8, the portion of the cable portion 152 arranged on the detour path is located between the heat insulation layer 140 and the outer layer 120, but it may also be located between the heat insulation layer 140 and the heating layer 130. Also, when the heat insulation layer 140 is composed of two layers, a first heat insulation layer and a second heat insulation layer as in variation example 5, the portion of the cable portion 152 arranged on the detour path may also be located between the first heat insulation layer and the second heat insulation layer. The jacket heater 100 of this modification example 6 is a laminate including an inner layer 110, an outer layer 120, a heating layer 130 and a heat insulation layer 140 disposed between the inner layer 110 and the outer layer 120; it can be manufactured by a method including the step of forming the laminate, and a temperature sensor 150 is fixed to the laminate. The temperature sensor 150 includes a temperature detection point 151 and a cable portion 152 extending from the temperature detection point 151. In the step of forming the laminate, the temperature detection point 151 is disposed between the inner layer 110 and the heating layer 130. Also, in the step of forming the laminate, the cable portion 152 extends from between the inner layer 110 and the heating layer 130 toward the outer layer 120, penetrates the heating layer 130, the heat insulation layer 140 and the outer layer 120, and in at least one adjacent layer interface among the heating layer 130, the heat insulation layer 140 and the outer layer 120, the portion from the lead-out portion led out from one of the adjacent layers to the lead-in portion led into the other layer is disposed on a path that detours the straight path connecting the lead-out portion and the lead-in portion. [Second Embodiment] Hereinafter, the jacket heater of the second embodiment of the present invention will be described. Similar to the jacket heater 100 of the first embodiment, in the jacket heater 100 of this embodiment, a part of the cable portion 152 of the temperature sensor 150 is disposed on a detour path. In addition, the feature is that the temperature detection point of the temperature sensor 150 is disposed at a position where it does not overlap with the heating wire 131 in a direction perpendicular to the contact surface CS between the object to be heated (pipe P) and the inner layer 110. Hereinafter, the jacket heater 100 of this embodiment will be described with reference to FIGS. 10 to 15. In addition, the same reference numerals are given to the structures described in the jacket heater 100 of the first embodiment, and detailed descriptions thereof are omitted. As shown in FIG. 10, the jacket heater 100 of this embodiment has a temperature sensor for detecting temperature by adding a temperature controller 160 in addition to the temperature sensor 150. In addition, the jacket heater 100 of this embodiment only needs to have the temperature sensor 150 and may not have the temperature controller 160. Also, instead of the temperature controller 160, a thermistor and a temperature fuse that obtain temperature based on the resistance value can also be used. The temperature sensor 150 is composed of a temperature detection point 151 that detects the temperature of the object to be measured and a cable portion 152 extending from the temperature detection point 151. For example, a thermocouple, a resistance thermometer, etc. can be used. As a specific thermocouple (temperature sensor 150), for example, the thermocouple illustrated in FIG. 11. The thermocouple shown in FIG. 11 includes a positive thermocouple core wire A formed of metal, a negative thermocouple core wire B formed of a metal of a different type from the positive thermocouple core wire A, an inorganic insulating material D such as magnesium oxide (MgO) for insulating the positive thermocouple core wire A and the negative thermocouple core wire B, and an extremely fine metal tube (sheath) C that houses these. In the temperature sensor 150 shown in FIG. 11, the temperature detection point 151 is the front end of the thermocouple where the contact point I of the positive thermocouple core wire A and the negative thermocouple core wire B exists; the cable portion 152 is the part excluding the front end of the thermocouple. The thermocouple shown in FIG. 11 generates an electromotive force corresponding to the temperature difference between the positive thermocouple core wire A and the negative thermocouple core wire B, thereby enabling the detection of the temperature of the object to be measured. The thermostat 160 is a temperature sensor that operates (outputs) when the temperature of the object to be measured reaches a specified temperature. For example, as shown in FIG. 12A, it is composed of a temperature detection unit 160a (i.e., a temperature detection point) that detects the temperature of the object to be measured and operates when the detected temperature reaches the specified temperature, and a mechanism unit 160b that disconnects the electrical connection by the operation from the temperature detection unit 160a. The temperature detection unit 160a is composed of a metal cover 160a1 that contacts the object to be measured, a holder 160a2 that forms a space 160S between the metal cover 160a1, and a bimetal plate 160a3 that laminates two sheet-like metal plates with different coefficients of thermal expansion provided in the space 160S into a spherical shape. The mechanism unit 160b is composed of a housing 160b1, a fixing plate 160b2 having an electrical contact 160b3 provided inside the housing 160b1, a movable plate 160b5 having an electrical contact 160b4 facing the electrical contact 160b3, a pin 160b8 fixed to the movable plate 160b5 and the bimetal plate 160a3, a terminal 160b6 outside the housing 160b1 that is electrically connected to the fixing plate 160b2, and a terminal 160b7 outside the housing 160b1 that is electrically connected to the movable plate 160b5. In addition, a thermostat cable 160C described later is connected to the terminal 160b6 and the terminal 160b7. If the temperature of the object to be measured in contact with the metal lid 160a1 rises to reach a specified temperature, the bimetal plate 160a3 performs an inversion action as shown in FIG. 12B due to this temperature change. Along with this, the deformation of the bimetal plate 160a3 is transmitted to the movable plate 160b5 by the pin 160b8. Thereby, the electrical contacts 160b3 and 160b4 act in a manner to perform an opening action. The opening action performed by the electrical contacts 160b3 and 160b4 cuts off the electrical connection between the electrical contact 160b3 and the electrical contact 160b4. Therefore, it is detected that this electrical connection is cut off and it can be judged that the temperature of the object to be measured has reached the specified temperature. In addition, for the inverted bimetal plate 160a3 as shown in FIG. 12B, if the temperature of the object to be measured is cooled to be less than the specified temperature, it returns to the original state as shown in FIG. 12A. Thereby, the electrical connection between the electrical contact 160b3 and the electrical contact 160b4 is restored. By detecting the restoration of the electrical connection, it can be judged that the temperature of the object to be measured has become less than the specified temperature. In addition, the configuration of the thermostat 160 is not limited to that shown in FIGS. 12A and 12B, and a previously known structure can also be adopted. Also, the thermostat 160 is not limited to the above-described automatic restoration type in which the electrical connection is automatically restored if it becomes a second specified temperature lower than the specified temperature at which the electrical connection is cut off. A manual restoration type in which the cut-off electrical connection is restored manually and a one-shot type in which the second specified temperature lower than the specified temperature at which the electrical connection is cut off is lower than room temperature can also be used. FIG. 13 is a sectional view taken along the line A-A' of the jacket heater 100 shown in FIG. 10. As shown in FIG. 13, in the jacket heater 100 of the present embodiment, a part of the temperature detection point 151 in the temperature sensor 150 and the cable portion 152 connected to the temperature detection point 151 is exposed on the inner surface of the inner layer 110 (in contact with the surface of the pipe P) and fixed. The temperature detection point 151 is exposed on the inner surface of the inner layer 110, whereby the temperature sensor 150 can detect the temperature of the pipe P (specify the temperature). In addition, among the cable portion 152, for the portion excluding the part exposed on the inner surface of the inner layer 110, it penetrates the inner layer 110, the heating layer 130, the heat insulating layer 140, and the outer layer 120 from the inner layer 110 toward the outer layer 120, and a part including the end is exposed and fixed on the outer surface of the outer layer 120 (not shown). In addition, the cable portion 152 is arranged on the above-described detour path on the way from the inner layer 110 to the outer layer 120. The thermostat 160, as shown in Fig. 13, penetrates through a part of the inner layer 110, the heating layer 130, and the heat insulation layer 140 and is fixed at a position surrounded by these three layers. Regarding the metal cover 160a1 of the temperature detection point, that is, the temperature detection unit 160a of the thermostat 160, it is exposed from the surface (inner surface) of the inner layer 110 and can contact the pipe P. The metal cover 160a1 is exposed from the surface (inner surface) of the inner layer 110, whereby the thermostat 160 can detect the temperature of the pipe P (whether it reaches the specified temperature). There is no particular limitation on the fixing method of the thermostat 160 to the inner layer 110, the heating layer 130, and the heat insulation layer 140. Similar to the temperature sensor 150, for example, a method can be used in which the thermostat 160 is sewn to the inner layer 110, the heating layer 130, and the heat insulation layer 140 with heat-resistant sewing threads. The thermostat 160 (terminals 160b6 and 160b7) can be used by connecting a thermostat cable 160C (not shown in Fig. 13) described later. The thermostat cable 160C connected to the thermostat 160 penetrates through a part of the heat insulation layer 140 and the outer layer 120, for example, and a part including the end is exposed from the outer surface of the outer layer 120. In addition, in the jacket heater 100 shown in Fig. 13, the temperature sensor 150 and the thermostat 160 can detect the temperature of the pipe P and can also detect the temperature inside the jacket heater 100. For example, the temperature detection point 151 of the temperature sensor 150 can be fixed between the inner layer 110 and the heating layer 130, so that the temperature of the inner layer 110 contacted by the temperature detection point 151 of the temperature sensor 150 can be measured (detected). When the temperature detection point 151 of the temperature sensor 150 is between the inner layer 110 and the heating layer 130, a part of the cable portion 152 of the temperature sensor 150, which extends from the temperature detection point 151, is located between the inner layer 110 and the heating layer 130. After excluding this part, the remaining part penetrates through the heating layer 130, the heat insulation layer 140, and the outer layer 120 from between the inner layer 110 and the heating layer 130 toward the outer layer 120, and a part including the end is exposed from the outer surface of the outer layer 120. Also, for example, the thermostat 160 can be fixed at a position surrounded by two layers of the heating layer 130 and the heat insulation layer 140 in such a way that the metal cover 160a1 of the thermostat 160 is exposed from the inner surface of the heating layer 130 (the surface contacting the inner layer 110), so that the temperature of the inner layer 110 contacted by the metal cover 160a1 can be detected. In the jacket heater 100 of this embodiment, the temperature detection points (temperature detection point 151 and temperature detection unit 160a) of the temperature sensor 150 and the temperature controller 160 are arranged, as shown in FIG. 13, at positions where they do not overlap with the heating wire 131 in the direction perpendicular to the contact surface CS between the pipe P (the object to be heated) and the inner layer 110. The direction perpendicular to the contact surface CS between the pipe P and the inner layer 110 is, in other words, the stacking direction of the inner layer 110, the heating layer 130, the heat insulation layer 140, and the outer layer 120; the temperature detection points (i.e., temperature detection point 151 and temperature detection unit 160a) of the temperature sensor 150 and the temperature controller 160 are arranged at positions where they do not overlap with the heating wire 131 in this stacking direction. Also, the fact that the temperature detection point does not overlap with the heating wire 131 means that all parts of the temperature detection point do not overlap with the heating wire 131. In addition, when the contact surface CS between the pipe P and the inner layer 110 is a curved surface as shown in FIG. 13, the direction perpendicular to the contact surface CS is, more specifically, the normal direction of the contact surface CS (the direction perpendicular to the tangent line tangent to the contact surface CS), which is also the diameter direction of the cylindrical pipe P. The positional relationship between the temperature detection points of the temperature sensor 150 and the temperature controller 160 and the heating wire 131 will be further specifically described with reference to FIG. 14. FIG. 14 is a developed view of the jacket heater 100 viewed from the outer layer 120 side. The part of the temperature sensor 150 exposed from the inner layer 110 is indicated by a dashed line in FIG. 14. In FIG. 14, the X-Y plane is a plane parallel to the contact surface CS, and the Z axis is the direction perpendicular to the contact surface CS. As shown in FIG. 14, in order to uniformly heat the pipe P, the heating wire 131 extends while turning back within the heating layer 130 (in the X-Y plane) in a manner arranged in a specified direction (the Y-axis direction in FIG. 14). The heating wire 131 extending in such a manner has one end of the bent portion 131t in a substantially C-shaped (substantially U-shaped) form connected to one end of the straight portion 131r extending linearly, and the other end of this straight portion 131r is connected to the other end of the other bent portion 131t, and is configured in such a repeated state. That is to say, the heating wire 131 has a plurality of bent portions 131t arranged in a staggered manner and is connected together via a plurality of straight portions 131r arranged parallel to each other. The temperature sensor 150 and the temperature controller 160 are configured to be located between the heating wires 131 when viewed from the Z-axis direction in a plan view. More specifically, the temperature sensor 150 and the temperature controller 160 are configured to be surrounded by the bent portions 131t when viewed from the Z-axis direction in a plan view. Thereby, the temperature detection point 151 of the temperature sensor 150 and the temperature detection point of the temperature controller 160, that is, the temperature detection unit 160a (the portion shown in thick ink in FIG. 14), are configured not to overlap with the heating wire 131 in the Z-axis direction. In addition, since the temperature controller 160 penetrates the heating layer 130 provided with the heating wire 131, in the plane where the heating wire 131 extends (in the X-Y plane), it can be arranged at a position sandwiched by the straight portions 131r of the heating wire 131 and at a position surrounded by the bent portions 131t of the heating wire 131. However, compared with being arranged at the position sandwiched by the straight portions 131r, it is preferably arranged at the position surrounded by the bent portions 131t as shown in FIG. 14. If the temperature controller 160 is arranged at the position surrounded by the bent portions 131t, the heating wire 131 surrounds the periphery of the temperature controller 160 more widely, so that the heating wire 131 located around the temperature controller 160 functions in a limiting manner to limit the movement of the temperature controller 160 in the X-axis direction and the Y-axis direction. Therefore, it is possible to further suppress the position deviation of the temperature controller 160 that occurs when the jacket heater 100 is installed and when maintenance and inspection are performed. Thus, the temperature controller 160 can continuously maintain accurate temperature detection. The temperature sensor 150 and the thermostat 160 only need to be configured such that their temperature detection points (temperature detection point 151 and temperature detection section 160a) do not overlap with the heating wire 131 in the Z-axis direction. For the parts other than the temperature detection points, they can also be configured to overlap with the heating wire 131. From the perspective of more accurately detecting the temperature, it is preferable that the temperature sensor 150 is configured such that all parts of the temperature detection point 151 exposed on the inner surface of the inner layer 110 (the parts of the temperature detection point 151 and the cable section 152 that are exposed on the inner surface of the inner layer 110) do not overlap with the heating wire 131 in the Z-axis direction, as shown in FIG. 14. Additionally, in FIG. 14, the temperature detection point 151 of the temperature sensor 150 is illustrated as being exposed from the inner surface of the inner layer 110, but the temperature detection point 151 of the temperature sensor 150 can also be located between the inner layer 110 and the heating layer 130. In this case, it is preferable that all parts of the temperature detection point 151 located between the inner layer 110 and the heating layer 130 (the parts of the temperature detection point 151 and the cable section 152 that are located between the inner layer 110 and the heating layer 130) do not overlap with the heating wire 131 in the Z-axis direction. Moreover, the positional relationship between the temperature sensor 150 and the thermostat 160 is not particularly limited, as long as the temperature detection points (temperature detection point 151 and temperature detection section 160a) are set not to overlap with the heating wire 131 in the Z-axis direction. For example, the temperature sensor 150 and the thermostat 160 can be configured to be arranged in the Y-axis direction as shown in FIG. 14, or they can be configured to be arranged in the X-axis direction. Additionally, the temperature sensor 150 and the thermostat 160 can also be configured not to be arranged in the X-axis direction and the Y-axis direction. Next, FIG. 15 is used to illustrate the usage method of the jacket heater of the present embodiment. As shown in FIG. 15, the jacket heater 100 of the present embodiment can be used by being connected to a power supply control device, and this power supply control device is connected to an external power supply. More specifically, the jacket heater 100 can be used by being connected to the power supply control device via the heating cable 131C connected to the heating wire 131, the cable section 152 of the temperature sensor 150, and the thermostat cable 160C connected to the thermostat 160. The power supply control device supplies power to the heating wire 131 via the heating cable 131C. By supplying power to the heating wire 131, the heating wire 131 is heated. Further, the power supply control device receives the electrical signal transmitted via the cable part 152 of the temperature sensor 150, and determines whether the temperature of the measurement object (pipe P) obtained from the electrical signal is within a specified range. When it is determined that the temperature of the measurement object is within the specified range, the power supply control device performs power supply control on the heating wire 131 to maintain the temperature of the heated body at this temperature. On the other hand, when it is determined that the temperature of the measurement object (pipe P) is higher than the specified range, the power supply control device performs power supply control on the heating wire 131 to make the temperature of the heated body (pipe P) lower than this temperature; when it is determined that the temperature of the measurement object (pipe P) is lower than the specified range, the power supply control device performs power supply control on the heating wire 131 to make the temperature of the heated body (pipe P) higher than this temperature. Further, the power supply control device supplies power to the thermostat 160 via the thermostat cable 160C. When the temperature of the measurement object (pipe P) rises and reaches the specified temperature, the thermostat 160 operates to disconnect the electrical connection between the power supply control device and the thermostat 160. When the electrical connection between the power supply control device and the thermostat 160 is disconnected, the power supply control device determines that the temperature of the measurement object (pipe P) has exceeded the specified temperature, thereby stopping the power supply control based on the temperature of the pipe P measured by the temperature sensor 150, and performing control to stop the power supply to the heating wire 131. After stopping the power supply to the heating wire 131, when the thermostat 160 is cooled and the heated body (pipe P) becomes lower than the specified temperature, the electrical connection between the power supply control device and the thermostat 160 is restored. When the electrical connection between the power supply control device and the thermostat 160 is restored, the power supply control device determines that the temperature of the measurement object (pipe P) is lower than the specified temperature, thereby starting again the power supply control based on the temperature of the pipe P measured by the temperature sensor 150. By connecting the jacket heater 100 of this embodiment to the above power supply control device and using it, it is possible to adjust the temperature of the heated body while detecting the temperature of the heated body, and thereby maintain the heated body within a desired temperature range. In addition, the power supply control performed by the power supply control device is not limited to the above power supply control, and previously known power supply control can also be used. Also, in Fig. 15, in addition to the electrical circuit between the heating wire 131 and the power supply control device (external power supply), an electrical circuit is also provided between the thermostat 160 and the power supply control device (external power supply), but it is not necessarily required to provide an electrical circuit between the thermostat 160 and the power supply control device (external power supply). In this case, the thermostat 160 is connected in series to the electrical circuit composed of the heating wire 131 and the power supply control device (external power supply). When the temperature of the measurement object (pipe P) rises and reaches the specified temperature, the thermostat 160 connected in series to the electrical circuit composed of the heating wire 131 and the power supply control device (external power supply) operates to disconnect the electrical connection in the electrical circuit composed of the heating wire and the power supply control device (external power supply), so as to stop the power supply to the heating wire 131. When the temperature of the measurement object drops and becomes lower than the second specified temperature which is lower than the specified temperature, the thermostat 160 operates to restore the electrical connection in the electrical circuit composed of the heating wire and the power supply control device (external power supply), so as to start the power supply to the heating wire 131 again. In this way, if the thermostat 160 is connected in series to the electrical circuit composed of the heating wire and the power supply control device (external power supply), even if there is no additional electrical circuit provided between the thermostat 160 and the power supply control device (external power supply) in addition to the electrical circuit between the heating wire 131 and the power supply control device (external power supply), temperature control can be implemented based on the temperature detected by the thermostat 160. At this time, the thermostat 160 functions not only as a temperature sensor but also as a power supply control device. Also, the above power supply control represents an example of the power supply control using the automatic recovery type thermostat 160. In the case where a manual recovery type that manually restores the disconnected electrical connection and a one-time type thermostat 160 whose second specified temperature, which is lower than the specified temperature at which the electrical connection is disconnected, is lower than room temperature are used as the thermostat 160, power supply control can be implemented corresponding to the recovery conditions of the electrical connection. In the jacket heater 100 of the embodiment described above, the temperature detection points (temperature detection points 151 and temperature detection unit 160a) of the temperature sensor 150 and the temperature controller 160 are provided at positions where they do not overlap with the heating wire 131 in a direction perpendicular to the contact surface CS between the pipe P, which is the object to be heated, and the inner layer 110. Therefore, in the jacket heater 100 of the present embodiment, compared with a jacket heater in which the temperature detection point overlaps with the heating wire 131 in a direction perpendicular to the contact surface CS, the distance between the heating wire 131 of the jacket heater 100 and the temperature detection point can be widened. Therefore, the temperature sensor 150 (and the temperature controller 160) is not easily affected by the heat generated by the heating wire 131. Therefore, in addition to the features of the first embodiment, the jacket heater 100 of the present embodiment further has the feature that the temperature detection point of the temperature sensor 150 is provided at a position where it does not overlap with the heating wire 131 in a direction perpendicular to the contact surface CS between the object to be heated (pipe P) and the inner layer 110. As a result, in addition to the cable portion 182 not being easily disconnected and the position of the temperature detection point 151 not being easily shifted, the temperature of the measurement object can be detected more accurately. Moreover, since the jacket heater 100 of the present embodiment can detect the temperature of the measurement object more accurately, when it is used by connecting the above power supply control device, appropriate power supply control can be implemented, and the object to be heated can be maintained within a desired temperature range. In addition, the jacket heater 100 of the present embodiment shown in FIGS. 10 to 15 includes two temperature sensors, namely, the temperature sensor 150 and the temperature controller 160, for detecting the temperature. However, the number of temperature sensors for detecting the temperature is not particularly limited, and as long as there is at least the temperature sensor 150. The temperature sensor for detecting the temperature may also be one or three or more. Even in this case, as long as the temperature detection point of the temperature sensor for detecting the temperature is provided at a position where it does not overlap with the heating wire 131 in a direction perpendicular to the contact surface CS between the pipe P, which is the object to be heated, and the inner layer 110, the distance between the heating wire 131 and the temperature detection point can be widened compared with a jacket heater in which the temperature detection point of the temperature sensor for detecting the temperature overlaps with the heating wire 131 in a direction perpendicular to the contact surface CS. Therefore, even if the number of temperature sensors for detecting the temperature is one or three or more, it is not easily affected by the heat generated by the heating wire 131, and the temperature of the measurement object can be detected more accurately. Moreover, since the temperature of the measurement object can be detected more accurately, as long as it is used by connecting a power supply control mechanism, the object to be heated can be maintained within a desired temperature range. [Third Embodiment] Hereinafter, a jacket heater according to a third embodiment of the present invention will be described. The jacket heater 100 of the present embodiment, similar to the jacket heater 100 of the first embodiment, is characterized in that a part of the cable portion 152 of the temperature sensor 150 is provided on the aforementioned detour path. In addition, it further includes a thermostat 160, and the heat insulation layer 140 is formed along the outer shape of the thermostat 160 and has a receiving portion to form a receiving space for the thermostat 160. Hereinafter, the jacket heater 100 of the present embodiment will be described with reference to FIGS. 16 to 21. In addition, the same reference numerals are given to the structures described in the jacket heater 100 of the first embodiment, and detailed descriptions thereof are omitted. In the jacket heater 100 of the present embodiment, a thermostat 160 as shown in FIGS. 16 and 17 is provided. The thermostat 160 is a bimetal type thermostat and is used to switch the energization or non-energization state of the heating wire 131 corresponding to the temperature of the pipe P. The thermostat 160 is arranged to contact the outer peripheral surface of the pipe P, and is configured such that the heat of the pipe P can be transferred to the thermostat 160. Thereby, the thermostat 160 can be operated corresponding to the temperature of the pipe P. With reference to FIGS. 16 and 17, the structure (an example) of the thermostat 160 will be described. FIG. 16 is a side view of the thermostat 160, and FIG. 17 is a view (bottom view) when the thermostat 160 is viewed from the direction of the arrow mark D1 shown in FIG. 16. In addition, the structure of the thermostat 160 is not limited to the structure shown in FIGS. 16 and 17. Inside the thermostat 160, a bimetal plate (not shown) is arranged; the bimetal plate deforms corresponding to the temperature, thereby switching the conduction (on) or disconnection (off) of the switch. When the thermostat 160 is connected in series to an electrical circuit composed of the heating wire 131 and an external power source, if the switch is conductive, energization to the heating wire 131 is permitted; if the switch is open, the energization to the heating wire 131 is interrupted. The thermostat 160 has a pair of terminals 161 for connecting the heating wire 131 and a pair of flanges 162 for fixing the thermostat 160. The pair of terminals 161 are connected to a switch that switches conduction or disconnection by the aforementioned bimetal plate. As shown in FIG. 17, an opening 162a is formed in each flange 162, and the wire is sewn to the support 132 while passing through the opening 162a, whereby the thermostat 160 can be fixed to the support 132. In addition, in the present embodiment, a wire is used to fix the thermostat 160 to the support 132, but it is not limited thereto. That is, as long as the thermostat 160 can be fixed to the support 132, for example, an adhesive can be used to fix the flange 162 of the thermostat 160 to the support 132. Also, even for a thermostat 160 without the flange 162 provided, it can be fixed to the support 132 by using a conventional fixing means (for example, an adhesive). FIG. 18 is a cross-sectional view showing the state in which the thermostat 160 is fixed to the support 132. In addition, the outer layer 120 is omitted in FIG. 18. In the support 132, an opening 132a through which the thermostat 160 passes is formed; in the inner layer 110, an opening 111 through which the thermostat 160 passes is also formed. Thereby, the thermostat 160 can be brought into contact with the outer peripheral surface of the pipe P. In the heat insulating layer 140, a receiving portion 141 is provided to receive a part of the thermostat 160. The receiving portion 141, as shown in FIG. 19, is a through hole penetrating the heat insulating layer 140 and is formed in a shape along the outer shape of the thermostat 160. Here, the receiving portion 141 does not need to strictly follow the outer shape of the thermostat 160, as long as at least a part of the receiving portion 141 contacts the outer surface of the thermostat 160 to be able to position the thermostat 160. As shown in FIG. 18, the flange 162 of the thermostat 160 is disposed between the support 132 and the inner layer 110 and is sewn to the support 132 as described above. Even by sewing the flange 162 to the support 132, the thermostat 160 can be positioned. FIG. 20 is a view (an example) showing the state in which the flange 162 is sewn to the support 132, and is a view when the thermostat 160 is viewed from the direction of the arrow mark D2 shown in FIG. 18. The inner layer 110 shown in FIG. 18 is omitted in FIG. 20. Further, FIG. 21 is a view when the thermostat 160 is viewed from the direction of the arrow mark D3 shown in FIG. 18, and the outer layer 120 and the heat insulating layer 140 are omitted in FIG. 21. As shown in FIG. 20, the thread 61 is passed through the opening 162a of the flange 162 and the thread is sewn to the support 132. Further, in the support 132, a reinforcing thread 62 is sewn along the edge of the opening 132a to ensure the strength of the opening 132a. As shown in FIG. 21, in the support 132, the heating wire 131 is disposed so as to avoid the area where the thermostat 160 is disposed. Specifically, the heating wire 131 is disposed along the opening 132a at a position only leaving a predetermined distance from the opening 132a of the support 132. For example, the heating wire 131 is fixed to the support 132 by sewing a thread (not shown) to the support 132 in such a manner as to press the heating wire 131 against the support 132. By disposing the support 132 as described above, the heat generated from the heating wire 131 can be made less likely to be transmitted to the thermostat 160, and the abnormal operation of the thermostat 160 due to the heat from the heating wire 131 can be prevented. In addition, for the regions in the support body 132 where the thermostat 160 is not disposed, the heating wire 131 can be disposed along a specified layout pattern in such a manner that the heat from the heating wire 131 can be easily transferred to the entire pipe P. For example, on the surface of the support body 132, the heating wire 131 can be disposed in a manner that the heating wire 131 is folded back while being arranged at a specified interval. Here, when the heat of the heating wire 131 is efficiently transferred to the entire pipe P, the interval between the heating wires 131 is likely to be smaller than the outer diameter of the thermostat 160. In this case, interference between the heating wire 131 and the thermostat 160 will occur. Therefore, it is meaningful to dispose the heating wire 131 along the opening 132a as described above. According to this embodiment, the housing portion 141 of the heat insulation layer 140 is formed along the outer shape of the thermostat 160 to house the thermostat 160. Therefore, in the jacket heater 100, the thermostat 160 can be positioned. Thereby, the thermostat 160 can be brought into contact with the pipe P without deviation, and the heat efficiency of the pipe P can be efficiently transferred to the thermostat 160. Further, the thermostat 160 can operate appropriately according to the temperature of the pipe P. Moreover, since the jacket heater 100 of this embodiment has the features of the first embodiment, the cable portion 152 of the temperature sensor 150 is not easily disconnected, and the position deviation of the temperature detection point 151 is not likely to occur. In addition, in this embodiment, the housing portion 141 penetrates the heat insulation layer 140, but it is not limited thereto. Specifically, the housing portion 141 may be a recess that opens toward the pipe P and does not penetrate the heat insulation layer 140. The side surface of this recess is formed in a shape along the outer side surface of the thermostat 160. Even when the thermostat 160 is housed in the recess, the effects of the above-described embodiment can be obtained. Further, when the thermostat 160 is housed in the recess, the terminals 161 of the thermostat 160 are located on the bottom surface side of the recess. Therefore, a path through which the heating wire 131 connected to the terminals 161 can pass can be formed in the heat insulation layer 140. 100, 1000: Jacket Heater 110, 1100: Inner Layer 111: Opening 120, 1200: Outer Layer 130, 1300: Heating Layer 131, 1310: Heating Wire 131r: Straight Portion 131t: Folded Portion 131C: Heating Cable 132: Support 132a: Opening 140: Heat Insulation Layer 141: Accommodating Portion 150: Temperature Sensor 151: Temperature Detection Point 152: Cable Portion 152a: Heat Insulation Layer Lead-out Portion 152b: Outer Layer Introduction Portion 152c: Heating Layer Lead-out Portion 152d: Heat Insulation Layer Introduction Portion 152e: Inner Layer Lead-out Portion 152f: Heating Layer Introduction Portion 160: Thermostat 160a: Temperature Detection Unit 160a1: Metal Cover 160a2: Holder 160a3: Bimetal Plate 160S: Space 160b: Mechanism Unit 160b1: Housing 160b2: Fixed Plate 160b3, 160b4: Electrical Contact Point 160b5: Movable Plate 160b6, 160b7: Terminal 160b8: Plug 160C: Thermostat Cable 161: Terminal 162: Flange 162a: Opening A: Positive Electrode Side Thermocouple Core Wire B: Negative Electrode Side Thermocouple Core Wire C: Ultra-thin Metal Tube D: Inorganic Insulating Material I: Contact Point S: Slit P: Pipe (Heated Object) CS: Contact Surface FIG. 1 is a perspective view of a jacket heater 100 according to a first embodiment. FIG. 2 is a sectional view taken along line A-A' of the jacket heater 100 shown in FIG. 1. FIG. 3 is a view showing a state when a tensile force is applied to a cable portion 152 of the jacket heater 100 shown in FIG. 2. FIG. 4 is an exploded view of the jacket heater 100 shown in FIG. 1. FIG. 5 is a modification 1 of the jacket heater 100 according to the first embodiment. FIG. 6 is a modification 2 of the jacket heater 100 according to the first embodiment. FIG. 7 is a modification 3 of the jacket heater 100 according to the first embodiment. FIG. 8 is a modification 6 of the jacket heater 100 according to the first embodiment. FIG. 9 is a perspective view of a conventional jacket heater 1000. FIG. 10 is a perspective view of a jacket heater 100 according to a second embodiment. FIG. 11 is a view for explaining the structure of a thermocouple. FIG. 12A is a view for explaining the structure of a thermostat 160. FIG. 12B is a view for explaining the structure of the thermostat 160. FIG. 13 is a sectional view taken along line A-A' of the jacket heater 100 shown in FIG. 10. FIG. 14 is an exploded view of the jacket heater 100 shown in FIG. 10. FIG. 15 is a view showing the jacket heater 100 connected to a power supply control device. FIG. 16 is a side view of a thermostat 160 provided in the jacket heater 100 according to a third embodiment. FIG. 17 is a bottom view of the thermostat 160 provided in the jacket heater 100 according to the third embodiment. FIG. 18 is a sectional view showing a structure in which the thermostat 160 is buried in the jacket heater 100 according to the third embodiment. FIG. 19 is a schematic view of a heat insulating layer 140, showing a portion for housing the thermostat 160. FIG. 20 is a view for explaining the structure of fixing the thermostat 160 to a support 132 and the positional relationship between the thermostat 160 and a heating wire 131. FIG. 21 is a view for explaining the structure of fixing the thermostat 160 to a support 132 and the positional relationship between the thermostat 160 and a heating wire 131. Domestic deposit information (please note in the order of deposit institution, date, and number) None Foreign deposit information (please note in the order of deposit country, institution, date, and number) None 100: Jacket heater 110: Inner layer 120: Outer layer 130: Heating layer 131: Heating wire 132: Support 140: Heat insulating layer 152: Cable portion P: Pipe S: Slit

Claims

1. A jacketed heater for use on a heated body, comprising: an inner layer in contact with the heated body, the inner layer having an inner surface and an outer surface located opposite to the inner surface; an outer layer; a heating layer and a heat insulation layer disposed between the inner layer and the outer layer; and a temperature sensor having a temperature detection point exposed on the inner surface of the inner layer and a cable portion extending from the temperature detection point, the inner surface in contact with the heated body; the cable portion extending from the inner layer toward the outer layer through the inner layer, the heating layer, the heat insulation layer, and the outer layer, and in at least one of the adjacent layers, a portion of the cable portion extending from one layer to the other layer is disposed on a path that detours the straight path connecting the extension portion and the inlet portion. The aforementioned outlet and the aforementioned inlet are disposed at different positions in the lamination direction of the aforementioned inner layer, the aforementioned heating layer, the aforementioned heat insulation layer and the aforementioned outer layer; in the aforementioned cable section, the portion between the aforementioned outlet and the aforementioned inlet is fixed to one of the aforementioned adjacent layers or the other layer in a relaxed state; the portion in the aforementioned cable section that generates the aforementioned relaxation functions as a buffer relative to the tensile force applied to the aforementioned cable section.

2. The jacketed heater as described in claim 1, wherein, The aforementioned heat insulation layer is composed of a first heat insulation layer disposed between the aforementioned heating layer and the aforementioned outer layer, and a second heat insulation layer disposed between the aforementioned first heat insulation layer and the aforementioned outer layer. The aforementioned cable portion, in the interlayer between at least one of the aforementioned inner layer, the aforementioned heating layer, the aforementioned first heat insulation layer, the aforementioned second heat insulation layer and the aforementioned outer layer, is arranged on a path that detours the straight path connecting the aforementioned outlet portion and the aforementioned inlet portion.

3. A jacketed heater, used for installation on a heated body, comprising: an inner layer and an outer layer in contact with the heated body; a heating layer and a heat insulation layer disposed between the inner layer and the outer layer; and a temperature sensor, the temperature sensor having a temperature detection point located between the inner layer and the heating layer, and a cable extending from the temperature detection point; the cable extending from between the inner layer and the heating layer toward the outer layer, passing through the heating layer, the heat insulation layer, and the outer layer, and in at least one of the adjacent layers, a portion extending from one layer to the other layer is disposed on a path that detours the straight path connecting the outlet and the inlet; the outlet and the inlet are disposed at different positions in the stacking direction of the inner layer, the heating layer, the heat insulation layer, and the outer layer. In the aforementioned cable section, the portion between the aforementioned outlet portion and the aforementioned inlet portion is fixed to one of the aforementioned adjacent layers or the other layer in a relaxed state; the portion in the aforementioned cable section that generates the aforementioned relaxation functions as a buffer relative to the tensile force applied to the aforementioned cable section.

4. The jacketed heater as described in claim 3, wherein, The aforementioned heat insulation layer is composed of a first heat insulation layer disposed between the aforementioned heating layer and the aforementioned outer layer, and a second heat insulation layer disposed between the aforementioned first heat insulation layer and the aforementioned outer layer. The aforementioned cable portion, in the interlayer between at least one of the aforementioned heating layer, the aforementioned first heat insulation layer, the aforementioned second heat insulation layer and the aforementioned outer layer, the portion from the outlet portion extending from one layer of the adjacent layer to the inlet portion extending into the other layer, is arranged on a path that detours the straight path connecting the aforementioned outlet portion and the aforementioned inlet portion.

5. The jacketed heater as described in claim 1 or 3, wherein, The aforementioned cable portion, located between the aforementioned outer layer and the aforementioned heat insulation layer, is positioned on a circuitous path that connects the aforementioned outlet portion and the aforementioned inlet portion in a straight line.

6. The jacketed heater as described in claim 1 or 3, wherein, The aforementioned heating layer has an electric heating wire as a heat source; an electric heating cable connected to the aforementioned electric heating wire extends from the aforementioned heating layer toward the aforementioned outer layer, passes through the aforementioned insulation layer and the aforementioned outer layer, and in the interlayer between at least one of the aforementioned heating layer, the aforementioned insulation layer and the aforementioned outer layer, the portion from the outlet portion leading out of one of the adjacent layers to the inlet portion leading into the other layer is arranged on a path that detours the straight path connecting the aforementioned outlet portion and the aforementioned inlet portion.

7. The jacketed heater as described in claim 6, wherein, The aforementioned heat insulation layer is composed of a first heat insulation layer disposed between the aforementioned heating layer and the aforementioned outer layer, and a second heat insulation layer disposed between the aforementioned first heat insulation layer and the aforementioned outer layer. The aforementioned electric heating cable, in the interlayer between at least one of the aforementioned heating layer, the aforementioned first heat insulation layer, the aforementioned second heat insulation layer and the aforementioned outer layer, is arranged on a path that detours the straight path connecting the aforementioned outlet and the aforementioned inlet.

8. The jacketed heater as described in claim 1 or 3, wherein, The aforementioned temperature sensor is a thermocouple or a resistance thermometer.

9. A method for manufacturing a jacketed heater, the jacketed heater being mounted on a heated body and being a laminate, the laminate comprising an inner layer and an outer layer in contact with the heated body, and a heating layer and a heat insulation layer disposed between the inner layer and the outer layer; the manufacturing method includes the step of forming the laminate, the laminate having a temperature sensor fixed thereon, the temperature sensor having a temperature detection point and a cable extending from the temperature detection point; the inner layer having an inner surface in contact with the heated body and an outer surface located on the opposite side of the inner surface; the temperature detection point being configured to protrude from the inner surface of the inner layer; The aforementioned cable portion extends from the inner layer to the outer layer, passing through the inner layer, the heating layer, the heat insulation layer, and the outer layer. In the interlayer between at least one of the adjacent layers, the portion extending from one of the adjacent layers to the portion leading into the other layer is positioned on a path that detours the straight path connecting the aforementioned outlet and the aforementioned inlet. The outlet and the inlet are located at different positions in the lamination direction of the inner layer, the heating layer, the heat insulation layer, and the outer layer. In the aforementioned cable portion, the portion between the outlet and the inlet is fixed to one or the other of the adjacent layers in a relaxed state. The relaxed portion in the aforementioned cable portion functions as a buffer against the tensile force applied to the cable portion.

10. A method for manufacturing a jacketed heater, the jacketed heater being mounted on a heated body and being a laminate, the laminate comprising an inner layer and an outer layer in contact with the heated body, and a heating layer and a heat insulation layer disposed between the inner layer and the outer layer; the manufacturing method includes the step of forming the laminate, the laminate being fixed with a temperature sensor, the temperature sensor having a temperature detection point and a cable extending from the temperature detection point; the temperature detection point being disposed between the inner layer and the heating layer; the cable extending from between the inner layer and the heating layer toward the outer layer, passing through the heating layer, the heat insulation layer and the outer layer, and in at least one of the adjacent layers of the heating layer, the heat insulation layer and the outer layer, the portion extending from a lead-out portion of one of the adjacent layers to a lead-in portion of the other layer is disposed on a path that detours the straight path connecting the lead-out portion and the lead-in portion; The aforementioned outlet and the aforementioned inlet are disposed at different positions in the lamination direction of the aforementioned inner layer, the aforementioned heating layer, the aforementioned heat insulation layer and the aforementioned outer layer; in the aforementioned cable section, the portion between the aforementioned outlet and the aforementioned inlet is fixed to one of the aforementioned adjacent layers or the other layer in a relaxed state; the portion in the aforementioned cable section that generates the aforementioned relaxation functions as a buffer relative to the tensile force applied to the aforementioned cable section.

11. A heating element covering a pipe for heating the interior of the pipe, comprising: an inner layer in contact with a body to be heated, the inner layer having an inner surface and an outer surface located opposite to the inner surface; an outer layer; a heating layer and a heat insulation layer disposed between the inner layer and the outer layer; and a temperature sensor having a temperature detection point exposed on the inner surface of the inner layer and a cable portion extending from the temperature detection point, the inner surface in contact with the body to be heated; the cable portion extending from the inner layer toward the outer layer through the inner layer, the heating layer, the heat insulation layer, and the outer layer, and in the interlayer between at least one of the inner layer, the heating layer, the heat insulation layer, and the outer layer, a portion extending from one layer to the other layer is disposed on a path that detours the straight path connecting the outlet and the inlet. The aforementioned outlet and the aforementioned inlet are disposed at different positions in the lamination direction of the aforementioned inner layer, the aforementioned heating layer, the aforementioned heat insulation layer and the aforementioned outer layer; in the aforementioned cable section, the portion between the aforementioned outlet and the aforementioned inlet is fixed to one of the aforementioned adjacent layers or the other layer in a relaxed state; the portion in the aforementioned cable section that generates the aforementioned relaxation functions as a buffer relative to the tensile force applied to the aforementioned cable section.

12. A heating unit covering a pipe for heating the interior of the pipe, comprising: an inner layer and an outer layer in contact with a heated body; a heating layer and a heat insulation layer disposed between the inner layer and the outer layer; and a temperature sensor having a temperature detection point located between the inner layer and the heating layer, and a cable extending from the temperature detection point; the cable extending from between the inner layer and the heating layer toward the outer layer, passing through the heating layer, the heat insulation layer, and the outer layer, and in at least one of the adjacent layers, a portion extending from a point on one of the adjacent layers to a point on the other layer is disposed on a path that detours the straight path connecting the point and the point; the point and the point are disposed at different positions in the stacking direction of the inner layer, the heating layer, the heat insulation layer, and the outer layer. In the aforementioned cable section, the portion between the aforementioned outlet portion and the aforementioned inlet portion is fixed to one of the aforementioned adjacent layers or the other layer in a relaxed state; the portion in the aforementioned cable section that generates the aforementioned relaxation functions as a buffer relative to the tensile force applied to the aforementioned cable section.

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