Heater device and method for manufacturing heater device

Abstract

Provided is a heater device that covers and heats an object to be heated, the heater device having a more durable lead-out part where lead wires and / or the like of a heating element are led out of the device. This heater device covers and heats an object to be heated by means of a heater body having at least an inner skin material in contact with the object to be heated, an outer skin material, and a heating element surrounded by the inner skin material and the outer skin material. The heater device is characterized in that the heating element has a heater wire that generates heat when energized and a plurality of insulator-covered lead wires that are connected to the heater wire and supply power, a reinforcing sheet is secured to a lead-out part of the outer skin material where the plurality of lead wires are led out to the outside, and the plurality of lead wires are led out to the outside by passing through the outer skin material and the reinforcing sheet.

Description

Heater device and manufacturing method thereof

[0001] The present invention relates to a heater device that covers and heats an object to be heated.

[0002] Patent Document 1 describes a mantle heater for heating pipes, etc. The mantle heater is made up of a laminated body including an inner cover material on the pipe side, an outer cover material that forms the outer surface, a heating element with a heating wire sewn onto it, and a heat insulating material, and is used by wrapping it around the pipe, etc. to heat it.

[0003] Patent No. 3752583

[0004] In the mantle heater of Patent Document 1, a conductor (lead wire) is connected to the heating wire, and the conductor wire that is drawn out to the outside of the heater is connected to a power source via a power source connector.

[0005] When a force is applied to the conductor wires at the portion where they are pulled out from the heater laminate, such as when they are pulled, the outer jacket material may be damaged.The same can happen at the portion where a temperature sensor such as a thermocouple is pulled out from inside the heater.

[0006] An object of the present invention is to provide a heater device that covers and heats an object to be heated, in which the lead-out portion through which the lead wires of the heating element are led out of the device has higher durability.

[0007] The gist of the present invention for solving the above problems is as follows: (1) A heater device that covers and heats an object to be heated with a heater main body having at least an inner cover material that contacts the object to be heated, an outer cover material, and a heating element surrounded by the inner cover material and the outer cover material, wherein the heating element has a heater wire that generates heat when current is applied, and a plurality of conductor wires covered with an insulator that are connected to the heater wire and supply power, and a reinforcing sheet is fixed to an extraction section of the outer cover material from which the plurality of conductor wires are extracted to the outside, and the plurality of conductor wires are extracted to the outside through the outer cover material and the reinforcing sheet.

[0008] (2) The heater device according to (1) above, wherein the plurality of conducting wires are separated and passed through the outer cover and the reinforcing sheet to be drawn out to the outside.

[0009] (3) The heater device according to (1) above, wherein the plurality of conducting wires are pulled out together through the outer cover and the reinforcing sheet to the outside.

[0010] (4) A heater device that covers and heats an object to be heated with a heater main body having at least an inner skin material that contacts the object to be heated, an outer skin material, and a heating element surrounded by the inner skin material and the outer skin material, wherein the heater main body has a temperature sensor that detects the temperature of the object to be heated, the temperature sensor having a thermocouple or a resistance temperature detector that passes from a tip side located on the side of the object to be heated through the heater main body to be drawn out from a lead-out portion of the outer skin material, and a reinforcing sheet is fixed to the lead-out portion of the outer skin material, and the thermocouple or the resistance temperature detector is drawn out to the outside through the outer skin material and the reinforcing sheet.

[0011] (5) The heater device according to (1) or (4) above, wherein the reinforcing sheet is a glass fiber sheet, a fluororesin sheet, or a fluororesin-coated sheet.

[0012] (6) The heater device according to (1) or (4) above, wherein the reinforcing sheet is fixed to the outer cover material by sewing.

[0013] (7) A method for manufacturing a heater device that covers and heats an object to be heated with a heater body having at least an inner cover material that contacts an object to be heated, an outer cover material, and a heating element surrounded by the inner cover material and the outer cover material, wherein the heating element is a heating element having a heater wire that generates heat when current is passed through it and a plurality of conductor wires that are covered with an insulator and connected to the heater wire to supply power, and the heater body has a reinforcing sheet fixed to a draw-out section of the outer cover material from which the plurality of conductor wires are drawn out, the method comprising the step of passing the plurality of conductor wires through the outer cover material and the reinforcing sheet.

[0014] Fig. 1 is a perspective view showing the configuration of a heater device 1 attached to a cylindrical pipe 100. Fig. 2 is a cross-sectional view showing the structure of the heater device 1. Fig. 3 is a cross-sectional view showing the structure of a heater device 200 of another embodiment. Fig. 4 is a cross-sectional view showing the structure of a heater device 300 of another embodiment.

[0015] First Embodiment Hereinafter, an embodiment will be described with reference to the drawings. A heater device 1 according to this embodiment is attached to the outer circumferential surface of a pipe 100, which is an object to be heated, and heats the pipe 100. For example, the heater device 1 can heat the pipe 100 in order to prevent by-products and exhaust gas from condensing and depositing inside the pipe 100 through which gas flows.

[0016] FIG. 1 is a perspective view showing the configuration of a heater device 1 attached to a cylindrical pipe 100. FIG. 2 is a cross-sectional view showing the structure of the heater device 1. In FIG. 1, the X-axis, Y-axis, and Z-axis are perpendicular to one another, and the pipe 100 extends in the X-axis direction. Note that, in this embodiment, an example in which the heater device 1 is attached to the pipe 100 extending in the X-axis direction will be described, but the heater device 1 can also be attached to a bent pipe 100. In this case, the heater device 1 can be formed into a bent shape so as to fit along the bent portion of the pipe 100.

[0017] The heater device 1 is disposed along the circumferential direction of the pipe 100 and has a pair of butting portions 1A, 1B that are butted against each other in the circumferential direction of the pipe 100. The heater device 1 can be attached to the pipe 100 by bending the heater device 1 along the pipe 100 so as to cover the outer peripheral surface of the pipe 100 and butting the pair of butting portions 1A, 1B together. When the heater device 1 is attached to the pipe 100 and electricity is applied, the pipe 100 is heated and kept warm.

[0018] The heater device 1 of this embodiment includes an inner cover material 20, a heating element 40, a heat insulating material 30, an outer cover material 22, a reinforcing sheet 60, etc. Among these, the inner cover material 20, the heating element 40, the outer cover material 22, etc. are stacked to form the heater main body 10. The heater device 1 heats an object to be heated by covering it with the heater main body 10. In the heater device 1 of this embodiment, the heater main body 10 is stacked in the following order from the side of the piping 100 to be heated (heating side). The heating element 40 and the heat insulating material 30 are surrounded by the inner cover material 20 and the outer cover material 22, which serve as surrounding bodies.

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

[0020] The outer cover material 22 constitutes the outer surface of the heater device 1. In this embodiment, a power cord 40c connected to the heater wire 40a of the heating element 40 is drawn out from a predetermined drawing portion P in the outer cover material 22 to the outside of the device.

[0021] Here, the lead-out portion P refers to a hole in the outer cover 22 through which the power cord 40c (conductors c1, c2) are led out and the surrounding area therearound. In the lead-out portion P, the conductors c1 and c2 may be led out together through a single hole, or they may be led out separately. In this embodiment, a lead-out portion P is described in which the two conductors c1, c2 of the power cord 40c extending from the heater wire 40a are led out separately from the outer cover 22. A reinforcing sheet 60 that reinforces the outer cover 22 is fixed to the lead-out portion P. The conductors c1, c2 of the power cord 40c are passed through two holes formed through the outer cover 22 and the reinforcing sheet 60, respectively, and led out.

[0022] The inner cover material 20 and the outer cover material 22 may be made of resin and may have a porous structure. The inner cover material 20 and the outer cover material 22 may be made of the same type of resin or different types of resin.

[0023] The inner cover material 20 and the outer cover material 22 may be made of any material that can withstand the heat transmitted from the heating element 40 (heater wire 40a), and the material is not particularly limited. Examples of such materials include PTFE (polytetrafluoroethylene), PFA (tetrafluoroethylene-perfluoroalkoxyethylene copolymer), FEP (tetrafluoroethylene-hexafluoropropylene copolymer), PCTFE (polychlorotrifluoroethylene), ETFE (tetrafluoroethylene-ethylene copolymer), ECTFE (chlorotrifluoroethylene-ethylene copolymer), PVDF (poly Examples of the material that can be used include a fluororesin sheet made of a fluororesin such as vinylidene fluoride, a fluororesin fiber cloth (woven fabric) made by weaving fibers of the above-mentioned fluororesin, an inorganic fiber cloth (woven fabric) made of inorganic fibers such as glass fiber, silica fiber, alumina fiber, and silica-alumina fiber, a fluororesin-coated inorganic fiber cloth made by coating the above-mentioned inorganic fiber cloth with the above-mentioned fluororesin, and a silicone resin-coated inorganic fiber cloth (for example, a silicone resin-coated glass cloth) made by coating the above-mentioned inorganic fiber cloth with a silicone resin.

[0024] The inner cover material 20 and the outer cover material 22 may be made of a resin material other than the above-mentioned fluorine-based resin, such as polyamide, polycarbonate, polyacetal, polybutylene terephthalate, modified polyphenylene ether, polyphenylene sulfide, polysulfone, polyether sulfone, polyarylate, polyether ether ketone, polyphthalamide, polyimide, polyetherimide, or polymethylpentene.

[0025] The heat insulating material 30 insulates and keeps the heat from the heating element 40 and the pipe 100 so that heat does not escape to the outside. The heat insulating material 30 can be formed, for example, from an inorganic fiber sheet or an organic fiber sheet, and is preferably formed from a non-flammable or flame-retardant material. The inorganic fiber sheet can be made of an inorganic fiber material such as glass fiber, ceramic fiber, or silica fiber. Alternatively, an inorganic fiber material can be needled and formed into a sheet using an inorganic binder such as colloidal silica, alumina sol, or sodium silicate as needed. On the other hand, the organic fiber sheet can be made of a sheet made of fibers such as aramid, polyamide, or polyimide.

[0026] Heating element 40 generates heat when energized and heats pipe 100. Heating element 40 has a heater wire 40a that generates heat when energized, an inorganic fiber sheet 40b to which heater wire 40a is sewn, and a power cord 40c that is connected to heater wire 40a and supplies power. Power cord 40c has two conductors c1 and c2 that are covered with an insulator.

[0027] The heater wire 40a of this embodiment is a single heater wire arranged in a predetermined arrangement pattern so that the entire area of ​​the pipe 100 covered by the heater device 1 can be uniformly heated. In the heating element 40, the inorganic fiber sheet 40b can be arranged on the inner cover material 20 side (pipe side), and the heater wire 40a can be arranged on the insulating material 30 side (outside) of the inorganic fiber sheet 40b. Both ends of the heater wire 40a are connected to conductors c1 and c2 of a power cord 40c, respectively, and extended to the outside of the heater device 1. The power cord 40c (conductors c1 and c2) extended to the outside of the device are connected to a power source 70 arranged outside the heater device 1. Heat can be generated by passing electricity through the heater wire 40a from the power source 70.

[0028] By forming the pull-out portion P and arranging the reinforcing sheet 60 near the connection portion between the heater wire 40a and the conductors c1 and c2, it is possible to avoid the need to fix the conductors c1 and c2 to any layer of the heater body 10 by sewing or the like and then route them to a distant location before pulling them out of the heater body 10, which is preferable.

[0029] The heater wire 40a may be a known one, for example, a heater wire having a structure in which a heating wire is wound around a core material such as polyester or glass and is covered with an insulator.

[0030] The inorganic fiber sheet 40b is a sheet-like member made of inorganic fibers such as glass fiber, ceramic fiber, or silica fiber. The inorganic fiber sheet 40b may be composed of one layer or multiple layers. When the inorganic fiber sheet 40b is composed of multiple layers, the layers may be made of the same material or different materials.

[0031] The power cord 40c can be an existing power supply cord or cable, but it need only include at least two conductors c1 and c2 covered with an insulator. The number of conductors may be three or more. The conductors c1 and c2 are preferably covered with a material that is heat resistant to the heat from the heater wire 40a. For example, a glass fiber braided wire, a silicone rubber wire, or a fluororesin wire can be used.

[0032] The power cord 40c (conductors c1 and c2) is preferably a flexible wire. For example, the conductors of the conductors c1 and c2 are preferably twisted wires, or the insulator (coating) of the conductors is preferably made of a flexible resin that allows for easy handling.

[0033] In addition, in order to prevent the wires c1 and c2 from rubbing against the reinforcing sheet 60 and becoming frayed, it is preferable to use a highly wear-resistant material as the coating material that forms the outer surface of the wires c1 and c2.For example, a coating of fluororesin or a coating of a glass fiber sheet coated with fluororesin or silicone resin can be used.

[0034] In this embodiment, the two conductors c1 and c2 included in the power cord 40c are pulled out separately through the outer cover 22 and the reinforcing sheet 60. Specifically, the conductors c1 and c2 are passed through two independent holes formed through the outer cover 22 and the reinforcing sheet 60, respectively, so that the conductors c1 and c2 are pulled out separately. The two holes only need to be formed to match the diameters of the conductors c1 and c2 so that no gaps are formed between the inner surfaces of the holes and the conductors c1 and c2. Furthermore, even if the conductors c1 and c2 rub against the holes at the pull-out portion P, causing the coating to wear away and exposing the internal conductors, the two holes only need to be formed with a sufficient distance between them to prevent the conductors from coming into contact with each other.

[0035] The conductors c1 and c2 drawn out to the outside are connected to a power source 70. Note that the conductors c1 and c2 drawn out to the outside may be combined into one wire as shown in Fig. 2 in consideration of cord handling, or may be connected to the power source 70 while remaining separate.

[0036] In this embodiment, the reinforcing sheet 60, through which the conductive wires c1 and c2 are passed, is sewn and fixed to the outer cover material 22 with sewing thread 60a. The material of the sewing thread 60a is not particularly limited, but polyester thread or nylon thread can be used. Any sewing method can be used as long as it can reliably fix the reinforcing sheet 60. Backstitching is preferable to prevent the sewing thread 60a from fraying.

[0037] The material of the reinforcing sheet 60 is not particularly limited as long as it can be sewn, but a low-friction sheet is preferred, specifically a glass fiber sheet, a fluororesin sheet, or a fluororesin-coated sheet, because a low-friction sheet can prevent friction with the conductors c1 and c2.

[0038] Examples of fluororesin sheets include fluororesin sheets made of fluororesins such as polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkoxyethylene copolymer (PFA), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), polychlorotrifluoroethylene (PCTFE), tetrafluoroethylene-ethylene copolymer (ETFE), chlorotrifluoroethylene-ethylene copolymer (ECTFE), and polyvinylidene fluoride (PVDF). Furthermore, fluororesin fiber cloth (woven fabric) made by weaving the above-mentioned fluororesin fibers may also be used as the fluororesin sheet. Furthermore, examples of fluororesin-treated sheets include fluororesin-coated inorganic fiber cloth obtained by coating inorganic fiber cloth (woven fabric) made of inorganic fibers such as glass fiber and alumina fiber with the above-mentioned fluororesin, and sheets obtained by coating a resin sheet or the like with the above-mentioned fluororesin.

[0039] The glass fiber sheet may be a glass fiber cloth or a silicone resin-coated glass fiber cloth obtained by coating a glass fiber cloth with a silicone resin.

[0040] The manufacturing method of the heater device 1 of this embodiment is as follows: The heater device 1 covers and heats the object to be heated with the heater main body 10 having at least an inner cover material 20 that contacts the object to be heated, an outer cover material 22, and a heating element 40 that is surrounded by the inner cover material 20 and the outer cover material 22, where the heating element 40 has a heater wire 40a that generates heat when current is applied and a plurality of conductor wires c1, c2 that are covered with an insulator and connected to the heater wire 40a to supply power, and the heater main body 10 has a reinforcing sheet 60 fixed to an extraction portion P of the outer cover material 22 where the plurality of conductor wires c1, c2 are extracted to the outside, and the manufacturing method includes a step of passing the plurality of conductor wires c1, c2 through the outer cover material 22 and the reinforcing sheet 60.

[0041] According to the present embodiment, the strength of the lead-out portion P, from which the power cord 40c is led out, is improved by being reinforced with the reinforcing sheet 60. This prevents damage to the lead-out portion P of the outer cover 22, even when the power cord 40c is pulled. Furthermore, the reinforcing sheet 60 is made of a low-friction glass fiber sheet, a fluororesin sheet, or a fluororesin-treated sheet, which prevents friction with the conductors c1 and c2. This prevents damage due to wear of the reinforcing sheet 60, improving the durability of the entire lead-out portion P. Furthermore, damage due to wear of the coatings of the conductors c1 and c2 can also be effectively prevented.

[0042] In addition, in this embodiment, the conductors c1 and c2 of the heating element 40 are pulled out separately through the outer cover 22 and the reinforcing sheet 60, thereby preventing friction between the conductors c1 and c2, thereby effectively preventing wear and damage to the coating due to friction.

[0043] Furthermore, even if the coatings of the conductors c1 and c2 are worn away by friction and the conductors are exposed without their coating near the draw-out portion P, the conductors c1 and c2 are separated from each other at the draw-out portion P and are passed through the outer cover material 22 and the reinforcing sheet 60, so that a short circuit can be prevented.

[0044] Furthermore, according to this embodiment, the diameter of the holes in the reinforcing sheet 60 through which the conductors c1 and c2 pass is formed to match the diameter of the conductors c1 and c2, and there is almost no gap between the reinforcing sheet 60 and the conductors c1 and c2, so that dust from the materials constituting the heater body 10, such as the insulating material 30, can be prevented from escaping to the outside through the holes in the drawer portion P, and dust and the like can be prevented from entering the inside from the outside.

[0045] Furthermore, according to this embodiment, even if the outer cover material 22 of the drawer portion P or the like is damaged, the drawer portion P is covered and reinforced with the reinforcing sheet 60, so that further damage to the interior of the outer cover material 22 or the like can be prevented. Furthermore, by suppressing damage, it is possible to prevent dust from being generated from inside due to the damage.

[0046] In the above embodiment, the heater device 1 has been described in which the conductors c1 and c2 of the power cord 40c are connected to both ends of a single heater wire 40a arranged in a predetermined pattern, but this is not limiting. For example, the heater device may have a configuration in which the conductors c1 and c2 are connected to a plurality of heater wires connected in parallel.

[0047] In addition, in this embodiment, the power cord 40c is described as being composed of two conductors, but this is not limited thereto and may be three or more conductors, and the present invention can be applied to cases where multiple conductors are drawn out from the drawer portion. For example, the power cord 40c may be composed of three or more conductors, or may be composed of three or more electric wires including a ground wire. In either configuration, it is sufficient that the multiple conductors are drawn out in a separated state when the power cord 40c is drawn out through the outer cover 22 and the reinforcing sheet 60.

[0048] Furthermore, although the heater device 1 includes the thermal insulation material 30 in this embodiment, the thermal insulation material 30 may be omitted by providing another layer with thermal insulation functionality. Furthermore, the heater device 1 may include additional layers or sheets other than those described above as necessary. For example, an inorganic fiber sheet may be disposed between the thermal insulation material 30 and the outer cover material 22. This inorganic fiber sheet may be formed using the same material as the inorganic fiber sheet 40b described above, and may be configured as one layer or multiple layers.

[0049] In addition, in this embodiment, the reinforcing sheet 60 is fixed to the outer cover material 22 by sewing with the sewing thread 60a, but other means may be used as long as they are capable of fixing. For example, the reinforcing sheet 60 may be fixed to the outer cover material 22 by other fixing means such as an adhesive.

[0050] Although the present embodiment has been described with the reinforcing sheet 60 being a single sheet, it is also possible to fix separate reinforcing sheets at the positions where the conductors c1 and c2 are pulled out, and pull the conductors c1 and c2 to the outside through holes formed in the respective reinforcing sheets.

[0051] In this embodiment, the holes in the outer cover material 22 through which the conductors c1 and c2 pass are holes that match the shapes of the conductors c1 and c2, but this is not limited to this. The holes in the outer cover material 22 may be, for example, slit-shaped holes formed by cutting linear cuts in the outer cover material 22. The slit-shaped holes may also be gaps formed between two reinforcing sheets arranged side by side.

[0052] In the present embodiment, the object to be heated by the heater device 1 is described as the pipe 100, but this is not limiting. By forming the heater device 1 to fit the shape of the object to be heated, it is possible to heat various objects other than the pipe 100, such as flanges, joints, valves, clamps, tanks, pumps, etc., as long as the object can be covered and heated by the heater main body 10.

[0053] The heater device 1 may further include a temperature sensor that detects the temperature of the pipe 100 or the like, which is the object to be heated. A thermocouple, for example, may be used as the temperature sensor. By controlling the supply of electricity to the heating element 40 based on the temperature detected by the temperature sensor, the temperature of the pipe 100 can be maintained at a desired temperature. The heater device 1 may further include a thermostat that switches the supply of electricity to the heating element 40 on and off depending on the temperature. By including a thermostat, thermal runaway of the heater device 1 can be suppressed.

[0054] In this embodiment, the heater device 1 has been described, but the present invention is not limited to this and may be a heating unit that covers and heats a pipe or the like and has a configuration similar to that of the heater device 1. The heating unit may be disposed as part of an apparatus that includes a pipe or the like. The same applies to the other embodiments described below.

[0055] Second Embodiment Next, a second embodiment will be described with reference to FIG. 3 . FIG. 3 is a cross-sectional view showing the structure of a heater device 200 according to this embodiment. As shown in FIG. 3 , this embodiment is an embodiment in which, at the lead-out portion P, two conductors c1 and c2 of a power cord 40c are bundled together and drawn out through a single hole formed in the outer cover 22 and the reinforcing sheet 60. Other configurations are the same as those of the heater device 1 according to the first embodiment. Note that the bundled conductors may be drawn through a single hole formed in the outer cover 22 or the reinforcing sheet 60. The conductors c1 and c2 may be independent and passed through the same hole, or may be integrated by an insulating coating or the like. Note that, in this embodiment, the number of conductors is not limited to two and may be multiple. For example, even when there are three or more conductors, they may be passed through a single hole formed in the outer cover 22 or the reinforcing sheet 60.

[0056] Even with the configuration of this embodiment, the strength of the draw-out portion P can be improved. That is, even if the power cord 40c is pulled, the draw-out portion P is reinforced by the reinforcing sheet 60, so that the draw-out portion P can be prevented from being damaged. Furthermore, by configuring the reinforcing sheet 60 as a low-friction glass fiber sheet, a fluororesin sheet, or a fluororesin-treated sheet, friction with the conductors c1, c2 is prevented, and damage due to wear of the reinforcing sheet 60 is prevented, improving the durability of the entire draw-out portion P.

[0057] Third Embodiment Next, a third embodiment will be described with reference to Fig. 4. Fig. 4 is a cross-sectional view showing the structure of a heater device 300 of this embodiment. The heater device 300 of this embodiment is an embodiment in which a reinforcing sheet 60 is disposed in an extraction portion P1 that extracts a thermocouple 50, which is a temperature sensor, from inside the heater body 10 to the outside of the outer skin material 22. The basic configuration of the heater device 300 is the same as that of the first embodiment.

[0058] The thermocouple 50 is a temperature sensor that detects the temperature of the pipe 100, which is the object to be heated. The tip of the thermocouple 50, which detects the temperature, is disposed on the pipe 100 side, which is the object to be heated. That is, the tip of the thermocouple 50 is disposed between the pipe 100 and the inner skin 20, or between the inner skin 20 and the heating element 40. The thermocouple 50 is extended from its tip side through the heater main body 10 to the outside. FIG. 4 shows, as an example, a configuration in which the tip of the thermocouple 50 is disposed between the pipe 100 and the inner skin 20, and is extended through the heater main body 10 to the outside of the heater main body 10 from an extension part P1.

[0059] The thermocouple 50 includes a sheath portion 50a in which a thermocouple wire is enclosed, a conductive wire 50c connected to the thermocouple wire, and a sleeve 50b forming a connection between the thermocouple wire and the conductive wire 50c. The sleeve 50b can be fixed to the surface of the outer cover material 22. The sleeve 50b may be fixed to the outer cover material 22 with a sewing thread 70 or the like. The sleeve 50b does not have to be fixed to the outer cover material 22 or the like. The sheath portion 50a extending from the sleeve 50b penetrates the reinforcing sheet 60, the outer cover material 22, the insulating material 30, the heating element 40, and the inner cover material 20, with its tip exposed to the piping (heating) side. The sheath portion 50a is bent at the position where it penetrates from the inner cover material 20 to the piping side and extends in a direction along the surface of the inner cover material 20 (piping 100). The tip of this sheath portion 50a comes into contact with the piping 100 to detect temperature. The distal end side of the sheath portion 50a may or may not be in close contact with the inner cover material 20. In addition, the distal end side may or may not be fixed to the inner cover material 20 with a thread similar to the suture thread 60a. A compensating lead wire can be used as the lead wire 50c.

[0060] As described above, the sheath portion 50a of the thermocouple 50 is drawn out through a hole formed in the reinforcing sheet 60 disposed in the drawing portion P1. The hole formed in the reinforcing sheet 60 may be formed to match the diameter of the sheath portion 50a so that no gap is formed between the inner surface of the hole and the sheath portion 50a, but may also be a slit-shaped hole as described above.

[0061] The arrangement and routing method of the thermocouple 50 outside the pull-out position P1 are not particularly limited, but for example, the sheath portion 50a can be arranged along the surface of the reinforcing sheet 60, and the sleeve 50b can be fixed to the outer skin material 22 at an adjacent position on the outer side of the reinforcing sheet 60. Alternatively, the thermocouple 50 can be arranged so that the sleeve 50b is arranged immediately after the sheath portion 50a is pulled out from the reinforcing sheet 60, so that the sheath portion 50a exposed outside the outer skin material 22 is as small as possible. In this case, the sleeve 50b can be arranged to overlap the reinforcing sheet 60, or the size and shape of the reinforcing sheet 60 can be adjusted so that there is no overlap.

[0062] The above configuration prevents damage to the lead-out portion P1 from which the thermocouple 50 is led out, similar to the case of the power cord 40c (conductors c1, c2) in the first and second embodiments described above. Furthermore, by configuring the reinforcing sheet 60 from a low-friction glass fiber sheet, a fluororesin sheet, or a fluororesin-coated sheet, friction with the sheath portion 50a of the thermocouple 50 is prevented, preventing damage due to wear of the reinforcing sheet 60 and improving the durability of the entire lead-out portion P1.

[0063] The temperature sensor is not limited to the thermocouple 50, and a resistance thermometer sensor having a structure similar to that of the thermocouple 50 may also be used. The resistance thermometer sensor has a resistance element disposed within the sheath portion 50a, and the structure of the sleeve 50b, conductor 50c, etc. is similar to that of the thermocouple. In the case of a resistance thermometer sensor, damage to the lead-out portion P1 can also be prevented, and the durability of the lead-out portion P1 can be improved.

[0064] REFERENCE SIGNS 1, 200, 300 Heater device 10 Heater body 20 Inner cover material 22 Outer cover material 30 Heat insulating material 40 Heat generating element 40a Heater wire 40c Power cord c1, c2 Conductor 50 Thermocouple 60 Reinforcing sheet 100 Piping

Claims

1. A heater device that covers and heats an object to be heated with a heater main body having at least an inner cover material that contacts the object to be heated, an outer cover material, and a heating element surrounded by the inner cover material and the outer cover material, wherein the heating element has a heater wire that generates heat when electricity is passed through it, and a plurality of conductors covered with an insulator that are connected to the heater wire and supply power, and a reinforcing sheet is fixed to a draw-out section of the outer cover material where the plurality of conductors are drawn out, and the plurality of conductors are drawn out through the outer cover material and the reinforcing sheet.

2. The heater device according to claim 1, wherein the plurality of conducting wires are separated and passed through the outer covering material and the reinforcing sheet before being drawn out to the outside.

3. The heater device according to claim 1, wherein the plurality of conducting wires are pulled out together through the outer cover and the reinforcing sheet.

4. A heater device that covers and heats an object to be heated with a heater body having at least an inner skin that contacts the object to be heated, an outer skin, and a heating element surrounded by the inner skin and the outer skin, wherein the heater body has a temperature sensor that detects the temperature of the object to be heated, the temperature sensor having a thermocouple or resistance thermometer that passes from its tip located on the side of the object to be heated through the heater body and is drawn out from a draw-out portion of the outer skin, and a reinforcing sheet is fixed to the draw-out portion of the outer skin, and the thermocouple or resistance thermometer is drawn out through the outer skin and the reinforcing sheet.

5. A heater device according to claim 1 or 4, characterized in that the reinforcing sheet is a glass fiber sheet, a fluororesin sheet, or a fluororesin-coated sheet.

6. A heater device according to claim 1 or 4, wherein the reinforcing sheet is fixed to the outer cover material by sewing.

7. A method for manufacturing a heater device that covers and heats an object to be heated with a heater body having at least an inner cover material that contacts the object to be heated, an outer cover material, and a heating element surrounded by the inner cover material and the outer cover material, wherein the heating element is a heating element having a heater wire that generates heat when electricity is passed through it and a plurality of conductor wires covered with an insulator that are connected to the heater wire and supply power, and the heater body has a reinforcing sheet fixed to a draw-out section of the outer cover material from which the plurality of conductor wires are drawn out, the method comprising the step of passing the plurality of conductor wires through the outer cover material and the reinforcing sheet.

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