JP2009272225A - Heating element unit, and heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To manufacture an heating element unit and a heating device as a highly efficient heat source capable of heating a heated body with a desired heat distribution and at a high temperature with high safety, reliability, and easiness. <P>SOLUTION: The heating element unit is formed of a film sheet material of a carbon-based substance containing material, a support ring having a position regulating function for arranging the belt-like heating element 2 having heat conduction of two-dimensional isotropic property at a prescribed position in a container 1 is installed, and an electric current route in the electric power supply part is not formed at the support ring. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a heating element unit used as a heat source and a heating device using the heating element unit, and in particular, a heating element unit having a heating element formed in a film sheet shape with a carbon-based material as a main component and the heat generation thereof. The present invention relates to a heating device using a body unit. Examples of the heating device according to the present invention include various devices that require a heat source such as an electronic device such as a copying machine, a facsimile, and a printer, and an electric device such as an electric heating device, a cooking device, and a dryer.

  The conventional heating element unit, which is a long heat source, is configured by enclosing a long coiled tungsten wire or a rod-like or plate-like carbon-based sintered body as a heating element inside a cylindrical glass tube. There was a thing. Recently, instead of these heating elements, as a highly versatile heating element unit that can heat a heated object more uniformly and at a higher temperature, it is a long and narrow sheet (band-like) mainly composed of a carbon-based material. ) Using a heating element is provided.

  In a conventional heating element unit, members (power supply members) for supplying power are attached to both ends of the heating element housed in the glass tube. The power supply member has a function of supplying power to the heating element and holding the heating element at a predetermined position inside the glass tube.

FIG. 9 is a plan view showing a heating element unit filed by the same applicant as the present application (see Patent Document 1). In the heating element unit shown in FIG. 9, the power supply member includes a cylindrical holding part 103 to which both ends of the heating element 102 are fixed, a heat dissipation part 104 wound around the outer peripheral surface of the holding part 103, and an elastic coil. A spring-shaped spring portion 105, an internal lead wire 106 formed of a wire together with the heat radiating portion 104 and the spring portion 105, a molybdenum foil 107 embedded in a welded portion of the glass tube 101, and an internal lead via the molybdenum foil 107 And an external lead 108 for supplying power to the line 106. As described above, in the conventional heating element unit, the spring portion 105 is provided on the power supply member for supplying power to the heating element 102. The spring part 105 is a coil spring shape having an elastic force formed larger than the winding diameter of the heat radiating part 104 wound around the outer peripheral surface of the holding part 103, and absorbs the thermal expansion of the heating element 102 during heat generation. The heating element 102 has a function of tensioning the heating element 102 at a predetermined position inside the glass tube by always applying tension from both sides of the heating element 102.
JP 2007-103292 A

The present inventors have developed a new film completely different in material and manufacturing method from a sheet-like heating element woven with carbon fibers and a heating element obtained by adding a resin to the knitted carbon fibers and firing. We have been working on the development of a heating element unit as a new heat source by applying a sheet-like material to the heating element as a heating material. The new film sheet-like material to be applied to the heating element used in such a heating element unit has a smoother surface than the surface of the conventional heating element and has flexibility. The power supply member used in the heating element unit cannot reliably hold the new heating element. If the conventional heating element unit configuration is applied to the new heating element unit as it is, there is a problem in terms of safety and reliability. was there.

  The present invention easily manufactures a heating element unit and a heating device capable of heating a heated object with a desired heat distribution and at a high temperature with high efficiency, with a simple configuration and high safety and reliability. It aims at making it the structure which can be performed.

In order to achieve the above object, a heating element unit according to the first aspect of the present invention includes:
A belt-like heating element formed of a film sheet made of a carbon-containing material and having two-dimensional isotropic thermal conduction;
A power supply unit for supplying power to opposite ends of the heating element;
In the heating element unit comprising the heating element and a container containing a part of the power supply unit,
A position restricting portion that is fixed to the power supply portion inside the container and holds the heating element at a predetermined position inside the container, wherein a current path in the power supply portion is not formed in the position restricting portion. It is configured as follows. The heating element unit according to the first aspect of the present invention configured as described above can heat an object to be heated to a high temperature with a desired heat distribution, has high safety and reliability, and is efficient. It becomes a high heat source and becomes a structure easy to manufacture.

In the heating element unit according to the second aspect of the present invention, the power supply unit according to the first aspect includes a holder for holding both ends of the heating element, and an internal lead electrically connected to the holder. And having a line part,
The position restricting portion is a coiled support ring fixed to the internal lead wire portion;
At least a part of the outer peripheral portion of the position restricting portion is disposed close to the inner peripheral surface of the container. In the heat generating unit according to the second aspect of the present invention configured as described above, the position restricting unit can surely arrange the heat generating element at a predetermined position in the container, and the heat source has high safety and reliability. It becomes.

  In the heating element unit according to the third aspect of the present invention, at least a part of the portion to which the position restricting portion is fixed in the internal lead wire portion according to the second aspect is deformed as compared with other portions. . The heating element unit according to the third aspect of the present invention configured as described above can easily and surely provide the position restricting portion at a predetermined position, and is easy to manufacture.

  In the heating element unit according to the fourth aspect of the present invention, the position restricting portion according to the third aspect is made of a metal wire, and a part of the position restricting portion is wound around the internal lead wire portion. The position restricting portion is fixedly configured. The heating element unit according to the fourth aspect of the present invention configured as described above can easily and surely provide the position restricting portion at a predetermined position, and is easily manufactured.

  In the heating element unit according to the fifth aspect of the present invention, the internal lead wire portion of the third aspect is made of a wire material, and the position restricting portion is fixed to a deformed portion of the internal lead wire portion. In the deformed portion of the internal lead wire portion, the cross-sectional area perpendicular to the current path flowing through the portion is 80% or more compared to the cross-sectional area perpendicular to the current path in the other portion. It is configured. The heat generating unit according to the fifth aspect of the present invention configured as described above is a heat source with high safety and reliability by suppressing heat generation at a portion where the position restricting portion is fixed in the internal lead wire portion.

  In the heating element unit according to the sixth aspect of the present invention, the internal lead wire portion according to the third aspect is constituted by a wire, and the portion of the internal lead wire portion to which the position restricting portion is fixed is bent. Has been configured. The heating element unit according to the sixth aspect of the present invention configured as described above can easily and surely provide the position restricting portion at a predetermined position, and is easily manufactured.

  In the heating element unit according to the seventh aspect of the present invention, the latch receiving portions formed at both ends of the heating element according to the third aspect are engaged with the latching portions formed at the internal lead wire portion. The heating element is configured to be stretched inside the container. The heating element unit according to the seventh aspect of the present invention configured as described above can easily and reliably hold the heating element for heating the heated object uniformly and at a predetermined position in the container. It becomes a safe and reliable heat source.

  In the heating element unit according to the eighth aspect of the present invention, the latch receiving portion of the heating element according to the seventh aspect is configured by a through-hole, and the latch receiver in the holder sandwiching both ends of the heating element. A through hole is formed at a position corresponding to the part, and the latching part is configured to penetrate through the latch receiving part and the through hole of the holder. The heating element unit according to the eighth aspect of the present invention configured as described above holds the heating element easily and surely at a predetermined position in the container, and does not fall off, and is safe and reliable. It becomes a high heat source.

  In the heating element unit according to the ninth aspect of the present invention, the hooking portion according to the eighth aspect is such that the protruding end portion that penetrates the through hole of the holder is plastically deformed to be larger than the diameter of the through hole. Yes. The heating element unit according to the ninth aspect of the present invention configured as described above can hold the heating element easily and surely at a predetermined position in the container, and does not fall off, so that it is safe and reliable. It becomes a high heat source.

  In the heating element unit according to the tenth aspect of the present invention, the heating elements according to the first to ninth aspects have an interlayer structure formed of a material containing a carbon-based substance. The heating element unit according to the tenth aspect of the present invention configured as described above can heat the object to be heated uniformly and at a high temperature, and becomes a highly efficient heat source.

  In the heating element unit according to the eleventh aspect of the present invention, the container according to the first to tenth aspects is configured by either a heat-resistant glass tube or a ceramic tube, and is sealed in the power supply unit. Thus, the inside of the container is filled with an inert gas. The heating element unit according to the eleventh aspect of the present invention configured as described above is a highly efficient heat source capable of heating the heated object to a high temperature.

  A heating apparatus according to a twelfth aspect of the present invention is equipped with the heating element unit according to the first to eleventh aspects as a heat source, and can uniformly heat a heated object to a high temperature. It becomes a heating device with high safety and reliability and high efficiency.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to provide the heat generating body unit and heating apparatus which can heat a to-be-heated body with desired heat distribution and high temperature efficiently, it is heat generation with high safety | security and reliability. The body unit and the heating device can be easily manufactured.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a heating element unit and a heating device using the heating element unit according to the present invention will be described with reference to the accompanying drawings.

(Embodiment 1)
A heating element unit according to Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a plan view showing the structure of the heating element unit according to the first embodiment. In FIG. 1, since the heating element unit has a long shape, an intermediate portion thereof is broken and omitted, and the vicinity of both end portions is shown. FIG. 2 is a front view of the heating element unit shown in FIG.

  In the heating element unit of the first embodiment, a belt-like heating element 2 in the form of a film sheet is arranged inside a heat-resistant elongated container 1. The belt-like heating element 2 extends along the longitudinal direction of the container 1. In the heat generating unit of the first embodiment, the container 1 is formed of a transparent quartz glass tube, and both ends of the quartz glass tube are welded in a flat plate shape to seal the container 1. Argon gas as an inert gas is sealed inside the container that houses the heating element 2 and the like. The inert gas that can be sealed inside the container is not limited to argon gas, but other than argon gas, nitrogen gas, or argon gas and nitrogen gas, argon gas and xenon gas, argon gas and krypton gas, etc. Even when a mixed gas is used, the same effect as that of the heating unit of the first embodiment can be obtained, and the inert gas to be sealed can be appropriately selected according to the purpose. The reason why the inert gas is sealed inside the container 1 is to prevent oxidation of the heating element 2 that is a carbon-based material inside the container when used at a high temperature. The material of the container 1 can be any material having heat resistance, insulation and heat permeability. For example, in addition to quartz glass, glass materials such as soda lime glass, borosilicate glass, lead glass, etc. , And a ceramic material or the like.

  As shown in FIGS. 1 and 2, the heating element unit according to the first embodiment includes a container 1, an elongated belt-like heating element 2 as a heat radiation film body, and the heating element 2 held at a predetermined position in the container. In order to do so, a power supply unit 8 is provided at both ends in the longitudinal direction of the heating element 2 and supplies power to the heating element 2.

  The power supply unit 8 provided at both ends of the heating element 2 includes a holder 3, a support ring 4, an internal lead wire portion 5, a molybdenum foil 6, and an external lead wire portion 7 attached to both ends of the heating element 2. It is out. An internal lead wire portion 5 is fixed to the holder 3, and the internal lead wire portion 5 is connected to both ends of the container 1 via molybdenum foils 6 embedded in sealed portions (welded portions) at both end portions of the container 1. Is electrically connected to an external lead wire portion 7 led out from the container.

As shown in FIGS. 1 and 2, a support ring 4 that is a position restricting portion having a position restricting function is attached to the internal lead wire portion 5. The internal lead wire portion 5 is composed of a single wire, for example, molybdenum wire, and the support ring 4 is formed by, for example, forming a molybdenum wire in a coil shape.
In addition, although the internal lead wire part 5 and the support ring 4 in Embodiment 1 are demonstrated by the example formed with the molybdenum wire, the metal wire (round bar shape, flat plate shape) which used tungsten, nickel, stainless steel, etc. as a material You may form using.

  As described above, in the heating element unit according to the first embodiment, the power supply unit 8 including the holder 3, the support ring 4, the internal lead wire portion 5, the molybdenum foil 6, and the external lead wire portion 7 includes: Provided on both sides of the heating element 2 to supply electric power to the heating element 2, the heating element 2 is stretched at a predetermined position in the container.

  FIG. 3 is a plan view showing the vicinity of one end of the heating element 2 in the heating element unit of the first embodiment. FIG. 4 is a front view of the vicinity of the end of the heating element shown in FIG. In addition, in the heat generating body 2 shown in FIG. 3, the surface shown by the top view of FIG.1 and FIG.3 turns into an opposing surface of a to-be-heated material.

  As shown in FIGS. 3 and 4, the end portion of the heating element 2 is sandwiched between the flat surface side and the back surface side by the holder 3, and the through hole formed in the approximate center of the holder 3 and the end of the heating element 2 The through hole formed in the portion is penetrated by the end portion of the internal lead wire portion 5. The internal lead wire portion 5 is formed in a so-called L shape by bending the end portion on the side of the heating element. The tip of the internal lead wire portion 5 bent in an L shape passes through the through hole of the holder 3 with the heating element 2 interposed therebetween and protrudes from the through hole of the holder 3.

  The protruding end portion 5a of the internal lead wire portion 5 protruding from the through hole of the holder 3 is provided with a drop-off preventing means (drop-off preventing means). As shown in FIG. 4, the protruding end portion 5a of the internal lead wire portion 5 is in a state of being crushed by plastic deformation by press working or the like. That is, the protruding end portion 5a of the internal lead wire portion 5 is processed to have a shape larger than the diameter of the through hole of the holder 3, and is provided with a means for preventing falling off. As a method of plastic deformation of the protruding end portion 5a of the internal lead wire portion 5, it is possible to use a mechanical processing method such as rotary caulking processing or a welding method using heat, current, plasma, or the like in addition to press working. it can. As another drop-off preventing means, a method of screwing the protruding end portion 5a of the internal lead wire portion 5 and screwing with a nut, or a locking ring such as a C-type retaining ring or an E-type retaining ring on the protruding end portion 5a. There is a locking method for attaching the like.

  The support ring 4 in the heating element unit of the first embodiment is wound around the internal lead wire portion 5 and fixed, and is formed in a coil shape. As shown in FIGS. 3 and 4, the attachment site 5 b in the internal lead wire portion 5 around which the support ring 4 is wound is crushed in a facing direction by pressing. In Embodiment 1, the internal lead wire portion 5 is a wire having a round cross section (molybdenum wire), but the cross section of the attachment site 5b in the internal lead wire portion 5 is substantially rectangular. That is, in the internal lead wire portion 5, the cross-sectional shape orthogonal to the direction in which the current flows is substantially rectangular at the attachment site 5b, and is different from the round cross-section at other sites.

  However, the cross-sectional area of the attachment part 5b of the internal lead wire part 5 in the first embodiment is formed to be 80% or more as compared with the cross-sectional area of the round cross section of the other part. Further, in the internal lead wire portion 5, the boundary portion between the round cross-section portion and the crushed substantially rectangular cross-section portion is formed so as to be gently deformed, so that there is no sudden shape change. Has been. Therefore, in the internal lead wire portion 5 which is a current path from the external lead wire 7 to the heating element 2, the resistance value does not change suddenly in the attachment portion 5b, and the temperature rise in the attachment portion 5b is suppressed.

  In the heating element unit of the first embodiment, as shown in FIGS. 3 and 4, at the boundary portion between the mounting portion 5 b of the internal lead wire portion 5 formed as described above and the round cross-sectional portion on the heating element side. A support ring 4 is wound around. The support ring 4 includes a winding portion 4a wound around the internal lead wire portion 5 and a ring portion 4b having a coil shape.

  The winding portion 4a of the support ring 4 is wound around the internal lead wire portion 5 by a plurality of turns (3 to 5 turns) (winding state). For this reason, the support ring 4 is fixed to the internal lead wire portion 5 without loosening. Therefore, the support ring 4 is not detached from the internal lead wire portion 5 and does not move on the internal lead wire portion 5. In addition, as another fixing method of the support ring 4 and the internal lead wire portion 5, a connection method by spot welding is also conceivable, but the mutual wires of the support ring 4 and the internal lead wire portion 5 are brittle due to heat generated during welding. There is a risk of destruction, and the connection point of the internal lead wire portion 5 may be melted to reduce the cross-sectional area. For this reason, the method of connecting the support ring 4 and the internal lead wire part 5 by spot welding is not a preferable connection method.

The ring portion 4b of the support ring 4 has a coil shape of at least one turn, and the diameter thereof is close to the inner surface of the cylindrical container 1 in which the heating element 2 is accommodated.
In the heating element unit according to the first embodiment, the width of the heating element 2 is 6.0 mm, the inner diameter of the cylindrical portion of the container 1 that houses the heating element 2 is 8.0 mm, and the ring portion of the support ring 4 The diameter of 4b is 7.0 mm. Therefore, in the heating element unit of the first embodiment, the gap between the ring portion 4b of the support ring 4 and the inner surface of the cylindrical portion of the container 1 is set to 1.0 mm in total at both ends. The dimensional relationship among the container 1, the heating element 2, and the support ring 4 can be changed as appropriate according to the product specifications and application as a heat source in which the heating element unit is used, including tolerances. The dimension is set such that the position of the body 2 can be regulated without touching the container 1.

  As described above, the support ring 4 in the heating element unit according to the first embodiment has a function as a position regulating member for disposing the heating element 2 at a predetermined position in the container. Since the outer peripheral portion of the ring portion 4b having a diameter larger than the width is in a position close to the inner peripheral surface of the container 1, the heating element 2 does not contact the container 1 (in the first embodiment, the container 1 The central axis in the longitudinal direction of the heating element 2 and the central axis in the longitudinal direction of the heating element 2 are arranged at the same axis).

  The support ring 4 configured as described above is configured to be wound around the internal lead wire portion 5 for supplying power to the heating element 2, and the support ring 4 is connected to the heating element 2 from the external lead wire portion 7. That is, the support ring 4 does not include the current path in the internal lead wire portion 5. Thus, since the support ring 4 has a configuration in which no current flows to the heating element 2, it does not generate heat due to the current. The support ring 4 according to the first embodiment has a function of restricting the position of the heating element 2 and also functions as a heat dissipation function that radiates heat conducted from the heating element 2.

The support ring 4 in the first embodiment will be described with an example formed of molybdenum wire. However, the support ring 4 has rigidity capable of regulating the position of the heating element 2 and is made of a material having excellent heat conduction (heat radiation function) and easy processing. If there is, it can be used as the support ring 4, and for example, a metal material such as nickel, stainless steel or tungsten can be used.
Further, the ring portion 4b of the support ring 4 in the first embodiment has a circular coil shape, but the present invention is not limited to this form, and has a shape having a position regulating function and a heat radiation function of the heating element 2. Can be used. For example, the ring portion 4b shown in FIGS. 3 and 4 has a number of turns of 1.5 turns, but the position regulation and the heat radiation function can be enhanced by increasing the number of turns. Further, as a winding method, it is not always necessary to wind densely along the longitudinal direction of the heating element 2, and a loosely wound portion can be provided. Further, the shape of the ring portion 4b is not limited to the coil shape, and may be any shape that can be easily formed and can regulate the heating element 2 to a desired position. In addition, although the winding part 4a wound around the internal lead wire part 5 is illustrated with a configuration in which the coil part 4b is wound only at one end on one side, it is not always necessary to form it at only one end, and the number of turns is particularly limited. When it is increased, it may be formed at both ends, and further provided at the intermediate portion of the coil portion 4b, the ring portion 4b is further stabilized.

  In the heating element unit of the first embodiment, the material of the heating element 2 itself has elasticity, and the shape pattern of the heating element 2 has elasticity, so that changes due to expansion and contraction in the heating element 2 are absorbed. This mechanism is unnecessary. In particular, since the heat generating element 2 used in Embodiment 1 has a small coefficient of thermal expansion, the heat generating element 2 disposed (stretched) in a state where tension is applied at the time of manufacture causes the heat generating element 2 and the heat generating element 2 to expand during heating. It can be absorbed by the elasticity of the shape pattern of the heating element 2. Therefore, it is not necessary to provide the spring portion (see FIG. 9), which is provided to always stretch the heating element in the conventional heating element unit, in the heating element unit of the first embodiment. As a result, in the heating element unit according to the first embodiment, the spring portion, which was necessary in the conventional configuration, is not necessary, and the heating element 2 can be extended in the arrangement space, compared to the container 1. The shape of the heating element 2 can be set large.

  The heating element 2 used in the heating element unit according to the first embodiment of the present invention has a laminated structure in which a carbon-based material is a main component and a part is fixed so that each layer forms a void in the thickness direction. It has a two-dimensional isotropic thermal conductivity, and is formed of a film sheet material having a thermal conductivity of 200 W / m · K or more. Therefore, the belt-like heating element 2 becomes a heat source that generates heat uniformly without temperature unevenness.

  The film sheet material that is a material of the heating element 2 has high heat resistance that is obtained by heat-treating a polymer film or a polymer film to which a filler is added in an atmosphere at a high temperature, for example, 2400 ° C. or more, and baking to graphitization. It is an oriented graphite film sheet, has a thermal conductivity in the plane direction of 200 W / m · K or more, and has a characteristic of 600 to 950 W / m · K. As described above, the heating element 2 used in Embodiment 1 has excellent two-dimensional isotropic heat conduction in which the thermal conductivity in the plane direction is 600 to 950 W / m · K.

  Here, the two-dimensional isotropic heat conduction indicates that the heat conductivity in all directions on the plane set by the orthogonal X axis and Y axis is substantially the same. Therefore, in the present invention, the two-dimensional isotropic direction means, for example, one direction (X-axis direction) which is a carbon fiber direction in a heating element formed by arranging carbon fibers side by side in the same direction, or a carbon fiber as a cross. It does not indicate only the two directions (X-axis direction and Y-axis direction) that are the carbon fiber directions in the knitted heating element, but means that the film sheet-like heating element 2 has the same properties in the surface direction.

  The film sheet material, which is a material of the heating element 2 used in the present invention, has a laminated structure and has various surface shapes such as a flat surface, a concavo-convex surface or a corrugated surface in the surface direction. A space is formed between the opposing layers. In this laminated structure of film sheet materials, the image of the formation state of the voids formed between the layers is folded so as to overlap a plurality of times (for example, tens of times, hundreds of times) to make a pie dough, and the pie Similar to the cross-sectional shape of the pie obtained by baking the dough. That is, the heating element 2 has an interlayer structure in which a plurality of film bodies formed of a material containing a carbon-based material are laminated and a part of the lamination direction is fixed, and a film having flexibility in the thickness direction. It is a sheet material. Therefore, the film sheet material which is a material of the heating element 2 in the present invention is a material having excellent two-dimensional isotropic thermal conductivity having the same thermal conductivity in the plane direction as described above.

  Examples of the polymer film used as the film sheet material manufactured as described above include polyoxadiazole, polybenzothiazole, polybenzobisthiazole, polybenzoxazole, polybenzobisoxazole, polypyromellitimide (pyromellitimide) ), Polyphenylene isophthalamide (phenylene isophthalamide), polyphenylene benzimitazole (phenylene benzimitazole), polyphenylene benzobisimitazole (phenylene benzobisimitazole), polythiazole, polyparaphenylene vinylene And at least one kind of polymer film. In addition, as fillers added to the polymer film, phosphate ester, calcium phosphate, polyester, epoxy, stearic acid, trimellitic acid, metal oxide, organotin, lead, azo, Examples thereof include nitroso and sulfonyl hydrazide compounds. More specifically, examples of the phosphate ester compound include tricresyl phosphate, phosphoric acid (trisisopropylphenyl), tributyl phosphate, triethyl phosphate, trisdichloropropyl phosphate, trisbutoxyethyl phosphate, and the like. be able to. Examples of calcium phosphate compounds include calcium dihydrogen phosphate, calcium phosphate hydrogen, tricalcium phosphate, and the like. Examples of polyester compounds include polymers obtained by reaction of adipic acid, azelaic acid, sebacic acid, phthalic acid and the like with glycols and glycerins. Examples of stearic acid compounds include dioctyl sebacate, dibutyl sebacate, and acetyl tributyl citrate. Examples of the metal oxide compound include calcium oxide, magnesium oxide, lead oxide and the like. Examples of trimellitic acid compounds include dibutyl fumarate and diethyl phthalate. Examples of the lead compound include lead stearate and lead silicate. Examples of the azo compound include azodicarbonamide and azobisisobutyronitrile. Examples of the nitroso compound include nitrosopentamethylenetetramine. Examples of the sulfonyl hydrazide compound include p-toluenesulfonyl hydrazide.

  The film sheet material is laminated, processed in an inert gas at 2400 ° C. or higher, and controlled by adjusting the pressure of the gas processing atmosphere generated in the process of graphitization to produce a film sheet heating element . Furthermore, if necessary, the film sheet-shaped heating element produced as described above is subjected to a rolling treatment to obtain a higher-quality film sheet-shaped heating element. The film sheet-like heating element manufactured in this way is used as the heating element 2 in the heating element unit of the present invention.

  In addition, the range of 0.2-20.0 weight% is suitable for the addition amount of the said filler, More preferably, it is the range of 1.0-10.0 weight%. The optimum addition amount differs depending on the thickness of the polymer. When the polymer thickness is thin, the addition amount is preferably large, and when it is thick, the addition amount may be small. The role of the filler is to make the film after heat treatment into a uniform foamed state. That is, the added filler generates a gas during heating, and the cavity after the generation of the gas becomes a passage to help the gentle passage of the decomposition gas from the inside of the film. The filler thus helps to create a uniform foamed state.

  The film sheet material manufactured as described above is processed into a desired shape by, for example, a Thomson or Pinnacle punch, a sharp blade such as a rotary die cutter, or laser processing.

  The heating element 2 in the first embodiment has a thickness (t) of 100 μm (see FIG. 2), the width (W1) of the heat generating part 2b that generates heat in the heating element 2 is 6.0 mm (see FIG. 3), In the heating element 2, the width (W2) of the heating element holding part 2a held by the holder is about 5.0 mm (see FIG. 3), and the length (L) of the heating part 2b is 300 mm (see FIG. 1). is there. The length, width, and thickness of the heating element 2 are determined by the input voltage, the heating temperature, etc., and can be appropriately changed according to the product specifications and application as the heat source in which the heating element unit is used. is there.

  As shown in FIGS. 1 and 3, a plurality of slits are extended in the direction perpendicular to the longitudinal direction of the heating element 2 in the heating part 2 b of the heating element 2 in the first embodiment. The plurality of slits formed in the heat generating part 2b regulates the flow direction of current in the heat generating part 2b and adjusts the resistance value. As the slit shape formed in the heat generating part 2b, there are a groove penetrating in accordance with a product specification and application in which the heat generating unit is used, a groove with a bottom, and the like. Moreover, in the concave groove, the resistance value of the heat generating portion 2b can be adjusted by changing the depth in the thickness direction.

  In addition, by forming a slit in the heating element 2 in the first embodiment, the heating element 2 has a large elasticity due to the elasticity of the slit shape in addition to the elasticity of the heating element itself. Become.

  A slit pattern shown in FIG. 3 is repeatedly formed in the heat generating portion 2b of the heat generating element 2 of the first embodiment. That is, the heat generating portion 2b of the heat generating body 2 includes an end slit 2d extending from the opposite position of both side edge portions parallel to the longitudinal direction to the center side orthogonal to the longitudinal direction, and the heat generating portion 2b orthogonal to the longitudinal direction. And a central slit 2e formed in the central portion of the. The opposed end portions on the center side of the opposed end slits 2d, 2d in the heat generating portion 2b have a first predetermined distance (a distance indicated by L1 in FIG. 3), and an energization path is provided in the central portion of the heat generating portion 2b. Forming. Moreover, the edge side edge part which is the both ends of the center slit 2e has the same 2nd predetermined distance (distance shown by L2 in FIG. 3) from the edge part of the width direction of the heat generating part 2b, respectively, and the heat generating part 2b An energization path is formed in the vicinity of both side edge portions. Further, in the heat generating portion 2b of the heat generating element 2, the longitudinal interval between the end groove 2d and the central groove 2e has a third predetermined distance (the distance indicated by L3 in FIG. 3). A current path that flows in a direction orthogonal to the longitudinal direction of the heating element 2 is formed between the groove 2e and the groove 2e.

  In the heating element 2 of the first embodiment, the third predetermined distance L3 that is the distance between the end groove 2d and the central groove 2e in the longitudinal direction is set to the same distance as the second predetermined distance L2. The predetermined distance L1 is set to be twice the second predetermined distance L2 and the third predetermined distance L3. In the heat generating part 2b of the heat generating element 2 formed with the groove pattern in this way, a meandering current path is formed, and the cross-sectional areas orthogonal to the current flow are substantially the same, and the resistance value can be easily calculated. Thus, a uniform temperature distribution can be formed. If the heat conductivity in the surface direction of the heating element 2 is a material having a characteristic of, for example, 600 W / m · K or more, the second predetermined distance L2 is not ½ of the first predetermined distance L1. Does not affect the uniform temperature distribution (heat distribution). Preferably, the strength of the heating element 2 against a mechanical shock applied to the heating element unit can be increased by setting the second predetermined distance L2 to be 1/2 or more of the first predetermined distance L1.

  In addition, the slit pattern formed in the heat generating portion 2b can be appropriately selected according to the product specification and application in which the heat generating unit is used, so that the heat generation distribution by the heat generating portion 2b can be a desired heat distribution pattern. It is.

  Further, in the heat generating part 2b, the distance L3 in the longitudinal direction between the end slit 2d and the central slit 2e is gradually increased toward the end in the longitudinal direction of the heat generating element 2, that is, the heat generating element holding part 2a. By gradually changing the resistivity of the current path in the portion 2b, it is possible to change the heat generation distribution (heat distribution pattern) of the heat generating portion 2b so that the central portion becomes hot. Of course, it is possible to obtain a heat source having a desired heat distribution pattern by appropriately changing the distances L1, L2, and L3 according to the product specifications and applications in which the heat generating unit is used.

The heating element 2 in Embodiment 1 is formed such that the width (W2) of the heating element holding part 2a is narrower than the width (W1) of the heating part 2b. And the area | region connected from the heat generating body holding | maintenance part 2a to the heat generating part 2b is formed so that it may become wide gradually, and the thermal radiation part 2f which has a thermal radiation function is formed in this area | region. The slits as described above are not formed in the heat radiating portion 2f, and a wide current path is formed. As a result, in the heat dissipating part 2f, the heat conducted from the heat generating part 2b is dissipated, and the heat stress in the heat generating element 2 is reduced and the life is extended. In addition, it is preferable that the edge shape of the thermal radiation part 2f connected from the heat generating body holding | maintenance part 2a to the heat generation part 2b is comprised by a curved surface shape in order to apply a concentrated load and to prevent a failure | damage.
In addition, when the temperature of the heat generating part 2b is high according to the product specifications, the temperature of the heat radiating part 2f from the heat generating part 2b to the heat generating element holding part 2a is gradually reduced, thereby providing a temperature gradient in the heat radiating part 2f and holding the heat generating element. It becomes possible to reduce the thermal stress to the part 2a.
Further, in the heating element 2, a temperature gradient is provided in the heating part 2 b by gradually increasing the length of the first predetermined distance L 1 and the second predetermined distance L 2 as it approaches the heating element holding parts 2 a on both sides. In addition, the structure is strong in mechanical strength and has impact resistance and vibration resistance.

  In the heating element 2 according to the first embodiment configured as described above, a slit pattern is formed in the heating part 2b, so that a desired current path can be set and it has elasticity. As a result, in the heat generating unit of the first embodiment, a desired heat generation distribution can be set according to product specifications and applications, and a member for supplying power to the heat generating element 2 is given elastic force. There is no need to provide a heat source that is larger than the size of the container 1.

  The heating element 2 used in the first embodiment has an excellent characteristic that it is light and thin, has a small heat capacity, and quickly rises when heat is generated by energization. For this reason, in the heat generating unit of Embodiment 1, it has the outstanding responsiveness and can be heated efficiently. Further, since the heating element 2 in the first embodiment is light and thin, the tension for tensioning the heating element 2 may be small. In the heating element unit according to the first embodiment, the heating element 2 to which a small tension set at the time of manufacture is applied can absorb the thermal expansion at a desired position in the container and reliably maintain the tensioned state.

In addition, although the heat generating body 2 in the heat generating body unit of Embodiment 1 was formed in the strip | belt shape by press work, and was slit-processed, it can also be processed into a desired shape using a laser. For example, as an example of laser processing, when the thermal conductivity in the surface direction of the heating element 2 is 200 W / m · K or more, laser processing mainly using a thermal processing action such as a CO ₂ laser (wavelength 10600 nm) is used. However, there is a problem that the heat generating body 2 is deprived of heat and cannot be processed. However, it is possible to process a desired shape with high accuracy by using laser processing with a wavelength of 1064 to 380 nm mainly composed of a non-thermal processing action, for example, short wavelength laser processing with a nominal 1064 nm.

  In particular, when forming the heating element 2 in the first embodiment, the inventors have confirmed that it can be processed with high accuracy by using the second harmonic laser processing with a name of 532 nm. The material of the heating element 2 in Embodiment 1 is a film sheet material, and a polymer film or a polymer film to which a filler is added is heat-treated in an atmosphere at a high temperature, for example, 2400 ° C. or higher, and baked to graphitize. The material is a highly oriented graphite film sheet having heat resistance. The heating element 2 is formed of a material having a thermal conductivity in the plane direction of 600 to 950 W / m · K. For example, when processing the heating element 2 having a thickness (t) of 100 μm, a width (W1) of 6.0 mm, and a length (L) of 300 mm from such a material, or as described above, a groove is formed in the heating part 2b. When processing into a complicated shape such as (slit), it is desirable to use the second harmonic laser processing with a name of 532 nm.

  A preferable laser processing method is appropriately selected from processing methods having a laser processing wavelength (1064 to 380 nm) mainly composed of the above-described non-thermal processing action depending on the material of the heating element 2, that is, the thermal conductivity and shape in the plane direction. It goes without saying that it can be done. Furthermore, it goes without saying that the laser processing method for processing the heating element 2 described above can also be adopted in the processing of the heating elements of the heating element unit in other embodiments described later.

  As described above, in the heating element unit according to the first embodiment, both end portions of the belt-like heating element 2 are securely held by the power supply unit 8 having a simple configuration, and the heating element 2 is placed at a predetermined position in the container. It is arranged. As described above, the heating element unit according to Embodiment 1 has high safety and reliability because the heating element 2 is securely held at a predetermined position in the container by the power supply unit 8 having a simple configuration. High heat source can be easily provided.

  FIG. 5 is a plan view showing a power supply unit having another configuration of the heating element unit according to Embodiment 1 of the present invention. In the heating element unit shown in FIG. 3, the winding portion 4 a of the support ring 4 is wound around a portion of the internal lead wire portion 5 that transitions from a substantially rectangular cross section to a round cross section. In the heating element unit shown in FIG. 5, the winding portion 4 a of the support ring 4 is wound around a portion having a substantially rectangular cross section of the attachment portion 5 b in the internal lead wire portion 5. Thus, even if the winding portion 4a of the support ring 4 is attached to the crushed attachment portion 5b, the support ring 4 does not come off the internal lead wire portion 5 and moves on the internal lead wire portion 5. There is nothing.

(Embodiment 2)
Hereinafter, the heating element unit according to the second embodiment of the present invention will be described with reference to FIG. The heating element unit according to the second embodiment is different from the heating element unit according to the first embodiment described above in the position where the heating element 2 is disposed with respect to the container 1, and thus support rings attached to both ends of the heating element 2 and The shape of the internal lead wire is different. In the second embodiment, the configuration of the heating element unit other than the support ring and the internal lead wire portion is the same as that of the heating element unit of the first embodiment. Therefore, hereinafter, the support ring and the internal lead wire portion in the second embodiment will be described. In addition, in the heat generating unit of Embodiment 2, the same code | symbol is attached | subjected to the thing which has the same function and structure as the heat generating unit of Embodiment 1, and the description of Embodiment 1 applies to the description.

FIG. 6 is a front view showing the support ring 40, the internal lead wire portion 50, and the like attached to the end of the heating element 2 in the heating element unit of the second embodiment.
As shown in FIG. 6, similarly to the heating element unit of the first embodiment, the end of the heating element 2 is sandwiched between the plane side and the back side by the holder 3, and is formed at the approximate center of the holder 3. The through hole formed in the end portion of the heat generating element 2 and the through hole is penetrated by the internal lead wire portion 50. The end portion of the internal lead wire portion 50 on the side of the heating element is bent and is formed in a so-called L shape. The protruding end portion 50a which is the tip of the internal lead wire portion 50 bent in this L shape is the heating element 2. Is passed through the through hole of the holder 3. Similar to the first embodiment, drop-out prevention means (drop-out prevention means) is applied to the protruding end 50a protruding from the through hole of the holder 3.

  The holder 3 used in the heating element unit of the second embodiment is formed by bending a flat plate material made of a conductive metal material in the same manner as the holder 3 of the first embodiment. The heating element holding part 2a of the heating element 2 is sandwiched. In order to strengthen the engagement state between the internal lead wire portion 50 and the holder 3 and prevent the holder 3 from moving relative to the internal lead wire portion 50, the holder 3 and the internal lead wire portion 50 are spotted. Welded.

As described above, the internal lead wire portion 50 attached so as to be engaged with the heating element 2 has a step portion 50c bent in a step shape. For this reason, the heating element 2 is arranged along the longitudinal direction at a position eccentric from the central axis in the longitudinal direction of the container 1. The internal lead wire portion 50 in the second embodiment is formed with an attachment portion 50b for winding the support ring 40. The attachment portion 50b is formed by being crushed by press work in the same manner as the attachment portion 5b of the internal lead wire portion 5 in the first embodiment. Therefore, in the second embodiment, in the internal lead wire portion 50, the cross-sectional shape orthogonal to the direction in which the current flows is a substantially rectangular shape in the attachment portion 50b, and the other portion has a round cross-section.
However, the cross-sectional area of the attachment portion 50b of the internal lead wire portion 50 in the second embodiment is formed to be 80% or more as compared with the cross-sectional area of the round cross section of the other part. In addition, in the internal lead wire portion 50, the boundary portion between the round cross-section portion and the crushed substantially rectangular cross-section portion is formed so as to have a gentle shape so that there is no sudden change in shape. Has been. Therefore, in the internal lead wire portion 50 that is a current path from the external lead wire 7 to the heating element 2, the resistance value does not change suddenly in the attachment portion 50b, and the temperature rise in the attachment portion 50b is suppressed.

  In the heating element unit according to the second embodiment, as shown in FIG. 6, a support ring 40 is wound around a boundary portion between the attachment portion 50b of the internal lead wire portion 50 and the round cross-sectional portion on the heating element side. The support ring 40 includes a winding portion 40a wound around the internal lead wire portion 50, and a ring portion 40b having a coil shape.

  The winding portion 40a of the support ring 40 is wound around the internal lead wire portion 50 by a plurality of turns (3 to 5 turns) (winding state). For this reason, the support ring 40 is fixed to the internal lead wire portion 50 without loosening. Therefore, the support ring 40 is not detached from the internal lead wire portion 50 and does not move on the internal lead wire portion 50. The ring portion 40b of the support ring 40 has a coil shape of at least one turn, and the diameter thereof is close to the inner surface of the container 1 in which the heating element 2 is accommodated. Therefore, the center of the ring portion 40 b of the support ring 40 is on a central axis parallel to the longitudinal direction of the container 1.

  As described above, in the heating element unit of the second embodiment, both end portions of the heating element 2 are securely held at predetermined positions in the container by the support ring 40 and the internal lead wire portion 50 having a simple configuration. In the heating element unit of the second embodiment, the heating element 2 is formed along the longitudinal direction at a position (eccentric position) deviated from the central axis in the longitudinal direction of the container 1. The heating element unit according to the second embodiment configured in this way uses the heating element 2 having the same specifications as the heating element 2 according to the first embodiment, and constructs a radiation state different from that of the heating element unit according to the first embodiment. can do. For example, the container 1 is configured such that a portion close to the heating element 2 has a high temperature so that the secondary radiation from the container 1 can be increased. Further, a reflective film may be formed on the container 1 (inner surface or outer surface) far from the heating element 2 to reflect the heat radiated from the heating element 2. Thus, since the reflective film can be formed at a position far from the heating element 2, even if the reflective film is the inner surface of the container 1, contact with the heating element 2 is prevented, safety is ensured, and a low melting point metal The film can be used as a reflective film. Further, in the heating element unit according to the second embodiment, since the reflection film (metal film) is disposed at a far position, the heat generation of the reflection film itself can be prevented.

  In the heating element unit according to the second embodiment, the winding portion 40a of the support ring 40 is wound around a portion of the internal lead wire portion 50 that transitions from a substantially rectangular cross section to a round cross section. However, similarly to the above-described heating element unit shown in FIG. 5, the winding portion 40 a of the support ring 40 may be wound only on a portion having a substantially rectangular cross section that is the attachment portion 50 b in the internal lead wire portion 50. Thus, even if the winding portion 40a of the support ring 40 is attached to the crushed attachment portion 50b of the internal lead wire portion 50, the support ring 40 does not come off from the internal lead wire portion 50, and the internal lead wire portion. It does not move on 50.

  The heating element unit according to the second embodiment configured as described above has safety because the heating element 2 is securely held at a predetermined position in the container by the support ring 40 and the internal lead wire portion 50 having a simple configuration. In addition, a highly reliable and highly efficient heat source can be easily provided.

(Embodiment 3)
Hereinafter, the heating element unit according to the third embodiment of the present invention will be described with reference to FIG. The heating element unit according to the third embodiment is different from the heating element unit according to the first embodiment in the configuration of the internal lead wire portion and the support ring for stretching the heating element 2. In the third embodiment, since the configuration other than the internal lead wire portion and the support ring in the heat generating unit is the same as that of the heat generating unit in the first embodiment, hereinafter the internal lead wire portion and the support ring in the third embodiment. Will be described. In addition, in the heat generating unit of Embodiment 3, the same code | symbol is attached | subjected to the thing which has the same function and structure as the heat generating unit of Embodiment 1, and the description of Embodiment 1 applies to the description.

FIG. 7 is a front view showing the internal lead wire portion 51, the support ring 41, and the like attached to the end of the heat generating element 2 in the heat generating unit of the third embodiment.
As shown in FIG. 7, similarly to the heating element unit of the first embodiment, the end of the heating element 2 is sandwiched between the plane side and the back side by the holder 3, and is formed at the approximate center of the holder 3. The through hole formed in the end portion of the heating element 2 and the through hole is penetrated by the protruding end portion 51 a which is the L-shaped tip of the internal lead wire portion 51. Similar to the first embodiment, drop-off prevention means (drop-off prevention means) is applied to the tip of the protruding end portion 51 a of the internal lead wire portion 51 protruding from the through hole of the holder 3.

  The holder 3 used in the heating element unit according to the third embodiment is formed by bending a flat plate formed of a conductive metal material in the same manner as the holder 3 according to the first embodiment. The heating element holding part 2a of the body 2 is sandwiched. In order to strengthen the engagement state between the internal lead wire portion 51 and the holder 3 and prevent the holder 3 from moving relative to the internal lead wire portion 51, the holder 3 and the internal lead wire portion 51 are spotted. Welded.

  The internal lead wire portion 51 attached so as to be engaged with the heating element 2 as described above is formed with an attachment portion 51b where the wire is bent in a concave shape. Unlike the attachment portion 5b of the internal lead wire portion 5 in the first embodiment described above, the attachment portion 51b is not crushed and remains circular in cross section. In the third embodiment, an example in which a wire having a round cross section is used as the internal lead wire portion 51 will be described. However, other cross sectional shapes, for example, a wire having a rectangular cross section (polygonal cross section) can be used. It is.

In the heating element unit according to the third embodiment, as in the first embodiment, the support ring 41 has a predetermined gap from the winding portion 41 a that is wound around the internal lead wire portion 51 and the inner surface of the container 1. And a coil-shaped ring portion 41b to be disposed.
A winding portion 41 a is formed by winding the wire of the support ring 41 at the number of turns of 3 to 5 at the attachment portion 51 b of the internal lead wire portion 51, and the support ring 41 is securely fixed to the internal lead wire portion 51. Has been.

Therefore, in the third embodiment, in the internal lead wire portion 51, the cross-sectional area perpendicular to the direction in which the current flows is the same round cross section without changing in the attachment portion 51b. Therefore, in the internal lead wire portion 51 that is the current path, the resistance value does not change at the attachment site 51b, and the temperature does not increase.
As described above, the ring portion 41b of the support ring 41 has a coil shape of at least one turn, and the diameter thereof is close to the inner surface of the container 1 in which the heating element 2 is accommodated. Therefore, the center of the ring portion 41 b of the support ring 41 is on a central axis parallel to the longitudinal direction of the container 1.

  As described above, in the heating element unit according to the third embodiment, the heating element 2 is securely held at a predetermined position in the container by the support ring 41 and the internal lead wire portion 51 having a simple configuration. In the heating element unit according to the third embodiment, similarly to the effect of the heating element unit according to the first embodiment, a heat source with high safety and reliability and high efficiency can be easily provided.

(Embodiment 4)
The heating apparatus in Embodiment 4 which concerns on this invention is demonstrated below using FIG.
FIG. 8 is a perspective view showing an example of a heating device equipped with the heating element unit described in the first to third embodiments.

  In FIG. 8, the heating element 61 of the present invention described in the first to third embodiments is mounted inside a device that is a heating heating device 61 that is an example of a heating device. In addition, in the heating apparatus 61 of Embodiment 4, the code | symbol 62 is attached | subjected and demonstrated to a heat generating body unit. The heating device 61 of the fourth embodiment is provided with components used for a general heating device such as a temperature controller 63, a reflector 64, and a protective cover 65.

  In the heating device 61 configured as described above, when a rated voltage is applied to the heating element unit 62, a predetermined current flows through the heating element 2 in the heating element unit 62 to generate heat, and the temperature rises with a rapid rise. To do. The heating device 61 of the fourth embodiment is reliably held at a predetermined temperature desired by the user by temperature control by the temperature controller 63. Moreover, since the heating element unit 62 uses the belt-like heating element 2 having a flat surface as a heat source, the heat radiated from the flat surface has directivity. In the heating device 61 according to the fourth embodiment, the heating element 2 of the heating element unit 62 is disposed so that the planar portion faces the front side and the back side. For this reason, the heat radiated from the front side of the heating element 2 heats the heated area on the front side of the heating device 61, and the heat radiated from the back side of the heating element 2 is reflected by the reflector 64. Heat the heated area. In addition, since the heat generating body 2 is formed in a strip shape with a film sheet material, the amount of heat radiated from the side surface side of the heat generating body 2 is very small and can be ignored as compared with the amount of heat radiated from the front side (back side). It is so small. For this reason, in the heating apparatus 61 of Embodiment 4, it has high directivity and can heat a to-be-heated area | region efficiently.

  The heating element unit 62 provided in the heating device of the present invention has the heating element 2 described in the first to third embodiments, and the heating element 2 has a thermal conductivity in the plane direction. Are formed of a film sheet material having the same two-dimensional isotropic thermal conductivity, and has a characteristic that the rise is quick and the inrush current is small due to the small heat capacity. For this reason, the heating device equipped with the heating element unit of the present invention as a heat source has excellent responsiveness that enables rapid heating, and has excellent characteristics that can heat a predetermined region with high thermal efficiency. It becomes a heating device.

  The heating element unit of the present invention can be used as a heat source for a wide variety of electronic / electrical equipment other than heating equipment. For example, OA equipment such as copying machines, facsimiles, and printers equipped with high-temperature heating elements. It can be used for various devices that require a heat source such as cooking appliances, dryers, humidifiers, and other electrical devices.

  The present invention can provide a heat source unit and a heating device having high safety and reliability, and capable of constructing a highly efficient heat source and having high work efficiency and excellent productivity. It is useful in the field of electronic / electric equipment that requires

The top view which shows the structure of the heat generating body unit of Embodiment 1 which concerns on this invention. Front view of the heating element unit shown in FIG. The top view which shows the holder 3, the internal lead wire part, the support ring, etc. which were attached to the edge part of the heat generating body 2 in the heat generating body unit of Embodiment 1. FIG. The front view which shows the holder 3, the internal lead wire part, the support ring, etc. which were attached to the edge part of the heat generating body 2 in the heat generating unit of FIG. The top view which shows another structure of the heat generating body unit of Embodiment 1 which concerns on this invention. The front view which shows the structure of the heat generating body unit of Embodiment 2 which concerns on this invention. The front view which shows the structure of the heat generating body unit of Embodiment 3 which concerns on this invention. The perspective view which shows an example of the heating apparatus of Embodiment 4 equipped with the heat generating body unit of Embodiment 1 to Embodiment 3 which concerns on this invention. Plan view showing the configuration of a conventional heating element unit

Explanation of symbols

1 container
2 Heating element 2a Heating element holding part 2b Heating part 3 Holding tool 4 Support ring 4a, 40a, 41a Winding part 4b, 40b, 41b Ring part 5 Internal lead wire part 5a, 50a, 51a Protruding end part 5b, 50b, 51b Attachment part 6 Molybdenum foil 7 External lead wire part 8 Power supply part

Claims (12)

A belt-like heating element formed of a film sheet made of a carbon-containing material and having two-dimensional isotropic thermal conduction;
A power supply unit for supplying power to opposite ends of the heating element;
In the heating element unit comprising the heating element and a container containing a part of the power supply unit,
A position restricting portion that is fixed to the power supply portion inside the container and holds the heating element at a predetermined position inside the container, wherein a current path in the power supply portion is not formed in the position restricting portion. A heating element unit configured as described above. The power supply unit has a holder for holding both ends of the heating element, and an internal lead wire part electrically connected to the holder;
The position restricting portion is a coiled support ring fixed to the internal lead wire portion;
The heating element unit according to claim 1, wherein at least a part of an outer peripheral portion of the position restricting portion is disposed close to an inner peripheral surface of the container.   The heating element unit according to claim 2, wherein at least a part of a portion of the internal lead wire portion to which the position restricting portion is fixed is deformed as compared with other portions.   The heating element unit according to claim 3, wherein the position restricting portion is made of a metal wire, and a part of the position restricting portion is wound around the internal lead wire portion to fix the position restricting portion.   The internal lead wire portion is made of a wire material, the position restricting portion is fixed to a deformed portion of the internal lead wire portion, and the deformed portion of the internal lead wire portion flows through the portion. The heating element unit according to claim 3, wherein a cross-sectional area perpendicular to the current path is 80% or more as compared with a cross-sectional area perpendicular to the current path in other portions.   The heating element unit according to claim 3, wherein the internal lead wire portion is made of a wire, and a portion of the internal lead wire portion to which the position restricting portion is fixed is bent.   A latch receiving portion formed at both ends of the heating element engages with a latching portion formed in the internal lead wire portion so that the heating element is stretched inside the container. Item 4. The heating element unit according to Item 3.   A hook receiving portion of the heating element is configured by a through hole, a through hole is formed at a position corresponding to the hook receiving portion in the holder sandwiching both ends of the heating element, and the hook portion is the hook. The heating element unit according to claim 7, wherein the heating element unit is configured to penetrate and receive the receiving portion and the through hole of the holding tool.   The heating element unit according to claim 8, wherein, in the latching portion, a projecting end portion that penetrates the through hole of the holder is plastically deformed to be larger than a diameter of the through hole.   The heating element unit according to any one of claims 1 to 9, wherein the heating element has an interlayer structure formed of a material containing a carbon-based substance.   The said container is comprised by either the glass tube or ceramic tube | pipe which has heat resistance, sealed in the said electric power supply part, and filled the inert gas inside the container. Heating element unit.   The heating apparatus equipped with the heat generating body unit as described in any one of Claims 1 thru | or 11 as a heat source.

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