JP2011146405A - Heat generating body unit and heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a downsized heat generating body unit which has high efficiency, high directivity, homogeneous heating property, and rapid rise; and to provide a heating device using the same. <P>SOLUTION: The heat generating body (2) in the heat generating body unit is formed by a polymer film or by a graphite film obtained by heat-treating the polymer film, and has equal heat conductivity in a face direction. By supplying electric power to the heat generating body, it generates heat on the overall face with high efficiency. <P>COPYRIGHT: (C)2011,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 of a carbon-based material as a main component and formed into a film, and the heating element. The present invention relates to a heating device using a unit.

  A conventional heating element unit used as a long heat source is configured by enclosing a coiled tungsten wire or a rod-like or plate-like carbon-based sintered body as a heating element inside a cylindrical glass tube. Yes. Examples of the heating device in which such a heating element unit is used include various electronic devices such as copiers, facsimiles, and printers, and various heat sources that require heat sources such as electric heaters, cooking appliances, and dryers. Equipment is included.

  As described above, a heating element unit is widely used as a heat source in various devices. For this reason, there are various requirements for the heating element unit so as to be compatible with the specifications of the function, shape, configuration, etc. of the equipment in which the heating element unit is used. For example, high temperature as a heat source, specified temperature can be maintained, temperature adjustment range is wide, input power can be converted into heating energy with high efficiency, heated object can be heated uniformly, specified It has a directivity that heats only the selected direction, has a small inrush current when the power is turned on, has a short rise time to the set temperature, and can be downsized and easily installed and removed. There is a request such as being.

  In order to satisfy the above requirements, various heating element units have been proposed. For example, as a conventional heating element unit that can be heated to a high temperature, a tape-like heating element formed by impregnating and fixing a resin to carbon fiber is sealed in a glass tube ( For example, see Patent Document 1.)

JP 2004-193130 A

  In the conventional heating element unit configured as described above, the heating element is formed by aligning carbon fibers in the longitudinal direction and fixing them in a tape shape with a resin. In the conventional heating element thus formed, the thermal conductivity in the direction parallel to the carbon fiber (the direction of the carbon fiber) is excellent when the carbon fibers are connected, but the processing was performed for the purpose of adjusting the resistance. In some cases, since the carbon fiber is partially cut, the thermal conductivity in the direction of the carbon fiber deteriorates rapidly. Moreover, since the thermal conductivity in the direction orthogonal to the carbon fiber direction is low, temperature variation occurs in each heating element unit as a heat source, and there is a problem in terms of reliability. Furthermore, there is a problem in that the cut portion of the carbon fiber is the starting point and a crack is generated, resulting in a short life.

  In addition, since the heating element in the conventional heating element unit has a structure in which carbon fibers are fixed with resin, it does not have flexibility, and it is difficult to meet various specifications required as a heat source in the heating device. there were.

  The present invention solves the problems in the above-described conventional heating element unit, and is small and highly efficient, and has high directivity and uniform heating, and heating using a heating element unit and its heating element unit that rises quickly. An object is to provide an apparatus.

In order to solve the above problems and achieve the object of the present invention, the heating element unit according to the first aspect of the present invention was obtained by heat-treating a polymer film or a polymer film to which a filler was added. A heating element formed of a graphite film and having a two-dimensional isotropic thermal conductivity in a plane direction;
A power supply unit for supplying power to opposite ends of the heating element;
A container containing the heating element and the power supply unit,
In the heating element, wide portions and narrow portions are alternately and continuously arranged in the longitudinal direction,
A hole is formed in the wide portion of the heating element to form an energization heat generation path, and the wide portion has regions with different unit length resistance values in the energization heat generation path. The heating element unit configured as described above has a heating element formed of a graphite film obtained by heat-treating a polymer film or a polymer film to which a filler is added, and has the same thermal conductivity in the plane direction. Because of the so-called two-dimensional isotropic thermal conductivity, the entire surface generates heat with high efficiency by energization, and becomes a heat source that rises quickly.

  In the heating element unit according to the second aspect of the present invention, the power supply unit according to the first aspect has a holding block for holding the heating element, and a heat-resistant member is provided on at least one side of the holding portion of the heating element. Have. In the heating element unit configured as described above, the heating element is reliably held by the power supply unit and becomes a highly reliable heat source.

  In a heating element unit according to a third aspect of the present invention, the power supply unit according to the first aspect has a holding block that holds the heating element, and a convex portion is formed on a part of the holding portion of the holding block. Has been. In the heating element unit configured as described above, the heating element is reliably held by the power supply unit and becomes a highly reliable heat source.

  In the heating element unit according to the fourth aspect of the present invention, the heating elements according to the first to third aspects are formed of a material having flexibility, flexibility, and elasticity. In the heating element unit configured as described above, processing of the heating element, incorporation into the device, and design of the device are facilitated.

  In the heating element unit according to the fifth aspect of the present invention, at least a part of the longitudinal direction of the heating element according to the first to fourth aspects is configured in a shape having different unit length resistance values. Yes. In the heating element unit configured as described above, a desired temperature distribution can be easily and reliably set.

  In the heating element unit according to the sixth aspect of the present invention, the container according to the first aspect to the fifth aspect is composed of either a glass tube or a ceramic tube having heat resistance. In the heating element unit configured as described above, the heating element can be structurally protected by the heat-resistant container.

  In the heating element unit according to the seventh aspect of the present invention, at least a part of the cross-sectional shape orthogonal to the longitudinal direction of the heating elements according to the first to sixth aspects is formed with a curved surface. In the heating element unit configured as described above, the heating element can be easily designed according to the purpose of use.

  In the heating element unit according to the eighth aspect of the present invention, at least a part of the container in the longitudinal direction of the first aspect to the seventh aspect is formed in a shape having a curved surface. In the heating element unit configured as described above, the degree of freedom in design can be expanded according to the purpose of use.

  According to a ninth aspect of the present invention, there is provided a heating element unit in which at least one end of the cylindrical container according to the first to eighth aspects is sealed at the power supply unit, and an inert gas is contained in the container. Filled. In the heat generating unit configured as described above, it is possible to prevent the heat generating element from being oxidized and extend its life.

  A heating element unit according to a tenth aspect of the present invention is a film in which the heating elements according to the first aspect to the ninth aspect are stacked in a thickness direction with a plurality of film materials stacked with gaps therebetween. It is made of a material having a conductivity of 200 W / m · K or more. The heating element unit configured as described above is a film-like heating element mainly composed of a carbon-based material, in which a plurality of film materials are laminated in the thickness direction, and the same thermal conductivity in each surface direction, It has so-called two-dimensional isotropic thermal conductivity, and the entire surface generates heat with high efficiency by energization, and becomes a heat source that rises quickly.

  In the heating element unit according to the eleventh aspect of the present invention, the heating elements according to the first to tenth aspects are in the form of a film having a thickness of 300 μm or less. In the heating element unit configured as described above, the heating element can be easily designed according to the purpose of use, and a heat source with high directivity can be constructed.

  In the heating element unit according to the twelfth aspect of the present invention, at least a part of the outer shape, the hole shape, and the cut shape in the heating elements according to the first to eleventh aspects is processed by a laser. The heating element unit thus formed can have a desired shape and can have a stable resistance value with excellent processing accuracy.

  A heating device according to a thirteenth aspect of the present invention includes the heating element unit according to the first to twelfth aspects, and a reflecting means is provided at a position facing the heating element. The heating device configured as described above is a heating device having a highly efficient heat source because the heating element unit and the reflecting means for reflecting the radiant heat from the heating element unit are provided.

  In the heating device according to the fourteenth aspect of the present invention, the reflecting means according to the thirteenth aspect is a reflecting plate having a curved cross-sectional shape in the longitudinal direction. The heating device configured as described above can efficiently heat the object to be heated by the radiant heat from the heating element.

  In the heating device according to the fifteenth aspect of the present invention, the reflecting means according to the thirteenth aspect is a reflecting plate having a curved cross-sectional shape in the longitudinal direction, and protrudes in the direction of the heating element at a part of the reflecting plate. Protrusions are formed. Since the heating device configured in this way does not heat the heating element by the reflecting plate, it is possible to realize a heating state according to the design specifications.

  In a sixteenth aspect of the heating device of the present invention, the reflecting means of the thirteenth aspect is a reflective film formed on the heating element unit. The heating device configured as described above can efficiently heat the object to be heated by the radiant heat from the heating element.

  A heating device according to a seventeenth aspect of the present invention includes the heating element unit according to the first aspect to the twelfth aspect, and a cylinder is disposed so as to surround the outer periphery of the heating element unit. The heating device configured as described above can be applied to an electronic device having a toner fixing mechanism, a cooking device, and the like.

  A heating device according to an eighteenth aspect of the present invention is the heating device according to any of the thirteenth to seventeenth aspects, further comprising a control circuit that performs electrical control of the heating element unit, wherein the control circuit performs on / off control, Each circuit of energization rate control, phase control, and zero cross control is comprised individually or in combination of at least two. The heating device configured in this way can construct a heat source having a desired temperature distribution with high accuracy.

  According to the present invention, it is possible to provide a heating element unit that is small and highly efficient, has high directivity, uniform heating, and quick start-up, and a heating device using the heating element unit.

The top view which shows the structure of the heat generating body unit of Embodiment 1 which concerns on this invention. The fragmentary top view which shows the structure of the heat generating body in Embodiment 1 which concerns on this invention The fragmentary sectional view which shows the structure of the holding block in Embodiment 1 which concerns on this invention The fragmentary top view which shows the various structural examples of the other heat generating body in Embodiment 1 which concerns on this invention The fragmentary top view which shows the various structural examples of the heat generating body in Embodiment 2 which concerns on this invention The fragmentary top view which shows the various structural examples of the heat generating body in Embodiment 3 which concerns on this invention The perspective view which shows the structure of the heat generating body unit of Embodiment 4 which concerns on this invention. The perspective view which shows the structure of the heat generating body in Embodiment 4 which concerns on this invention. The perspective view which shows the various structural examples of the other heat generating body of Embodiment 4 which concerns on this invention. Sectional drawing which shows the structure of the thermal radiation source in the heating apparatus of Embodiment 5 which concerns on this invention Sectional drawing which shows structures, such as a heat radiation source, in the heating apparatus of Embodiment 6 which concerns on this invention The figure which shows schematic structure of the temperature control apparatus in the heating apparatus of Embodiment 6 which concerns on this invention.

  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 front view showing the structure of the heating element unit according to the first embodiment. In FIG. 1, since the said heat generating body unit is elongate shape, the intermediate part is fracture | ruptured and abbreviate | omitted and the both end part vicinity is shown. FIG. 2 is a front view showing a part of the heating element in the heating element unit of the first embodiment. FIG. 3 is an enlarged view showing a part of the heating element unit according to Embodiment 1 in an enlarged manner.

  In the heating element unit of the first embodiment, an elongated heating element 2 is arranged inside a glass tube 1 made of transparent quartz glass, and the heating element 2 extends along the longitudinal direction of the glass tube 1. It is installed. Further, both end portions of the glass tube 1 are welded in a flat plate shape, and a heating element 2 is enclosed inside the glass tube 1 together with an inert gas such as argon gas, nitrogen gas, or a mixed gas of argon gas and nitrogen gas. Yes. Argon gas, nitrogen gas, or a mixed gas of argon gas and nitrogen gas, which is an inert gas sealed inside the glass tube 1, prevents oxidation of the heating element 2 that is a carbon-based material when used at high temperatures. It is to do.

  As shown in FIG. 1, the heating element unit according to the first embodiment includes an elongated flat plate-like heating element 2 as a heat radiating body and a holding for holding the heating element 2 between opposite ends of the heating element 2. Block 3. A first internal lead wire member 11A is attached to one holding block 3 (left holding block 3 in FIG. 1), and the other holding block 3 (right holding block 3 in FIG. 1) is attached to the other holding block 3 (right holding block 3 in FIG. 1). A second internal lead wire member 11B is attached. Each of the first internal lead wire member 11 </ b> A and the second internal lead wire member 11 </ b> B is externally led out from both ends of the glass tube 1 through molybdenum foils 8 embedded in welded portions at both end portions of the glass tube 1. The lead wire 9 is electrically connected.

  The first internal lead wire member 11A includes a coil portion 5 wound around the outer peripheral surface of the holding block 3 (left holding block 3 in FIG. 1), a spring portion 6 formed in a spiral shape and having elasticity, and molybdenum. The inner lead wire 7 connected to the foil 8 is a single wire. The second internal lead wire member 11B includes a coil part 5 wound around the outer peripheral surface of the holding block 3 (right holding block 3 in FIG. 1), a holding part 4 connected to the coil part 5, and molybdenum. The inner lead wire 7 connected to the foil 8 is a single wire. The first internal lead wire member 11A and the second internal lead wire member 11B in the first embodiment will be described using an example in which they are formed of molybdenum wires. Metals having elasticity made of tungsten, nickel, stainless steel, or the like are used. You may form using a line (round bar shape, flat plate shape).

  In the first embodiment, the holding block 3, the molybdenum foil 8, the external lead wire 9, and the first internal lead wire member 11A constitute the first power supply unit 10A, and the holding block 3, the molybdenum foil 8, A second power supply unit 10B is configured by the external lead wire 9 and the second internal lead wire member 11B.

Note that the spring portion 6 in the first internal lead wire member 11A applies tension to the heating element 2, and is configured so that the heating element 2 is always disposed at a desired position. That is, the heating element 2 is disposed on the substantially central axis of the glass tube 1 and is disposed so as not to contact the glass tube 1. In addition, by providing the spring portion 6 between the internal lead wire 7 and the coil portion 5, it is possible to absorb changes due to expansion and contraction in the heating element 2.
When the elongation rate of the material of the heating element 2 itself or the elongation rate of the shape of the heating element 2 is large with respect to changes due to expansion and contraction in the heating element 2, the internal lead wires on both sides of the heating element 2. It is not necessary to provide the spring portion 6 on the member.

  In the heating element unit according to the first embodiment, the coil portion 5 is wound around the outer peripheral surface of the holding block 3, but the coil portion 5 is wound around substantially half of the outer peripheral surface of the holding block 3 on the heating element 2 side. It is not exposed and is in an exposed state. Therefore, the heat conducted from the heating element 2 is radiated in the holding block 3.

  In the heating element unit of the first embodiment, an example in which internal lead wire members 11A and 11B having different configurations are provided at both ends of the heating element 2 will be described. However, in the heating element unit of the present invention, both ends of the heating element 2 are provided. The same constituent members as those of the first internal lead wire member 11A may be disposed, and appropriately changed according to the specifications of the heating device in which the heating element unit is used. If the first internal lead wire member 11A having the spring portion 6 is arranged at one end of the heating element 2, the position restriction of the heating element 2 and the change due to expansion and contraction can be absorbed. If the first internal lead wire member 11A is disposed, a further effect can be expected.

  When the heating device is incorporated so that the longitudinal direction of the heating element unit is the vertical direction, the spring portion 6 is heated at the temperature of the heating element 2 when the spring portion 6 is disposed above the heating element 2. Therefore, it is preferable to dispose the spring portion 6 on the lower side of the heating element 2 because the elastic limit may be exceeded and thermal expansion cannot be absorbed.

  Further, in the heating element unit of the first embodiment, the coil portion 5 of the first internal lead wire member 11A, the spring portion 6 and the internal lead wire 7, and the coil portion 5 of the second internal lead wire member 11B are held. Although the example in which the portion 4 and the internal lead wire 7 are integrally formed has been described, it is needless to say that the same effect can be obtained if they are formed of separate members and are electrically connected to each other.

FIG. 2 is a front view showing the heating element 2 in the heating element unit of the first embodiment.
The heating element 2 used in the first embodiment is formed by cutting a film, and the wide portions 2A and the narrow portions 2B are alternately arranged in the longitudinal direction. As shown in FIG. 2, the heating element 2 used in the heating element unit of Embodiment 1 has a so-called fishbone shape.

  The heating element 2 in Embodiment 1 has a thickness (t) of 100 μm, a maximum width (W1) of 6 mm, a minimum width (W2) of about 2 mm, and a length (L) of 250 mm (FIG. 1). Reference). Note that the length and width of the heating element 2 are determined by the input voltage, the heating temperature, and the like, and can be appropriately changed according to the specifications as the heat source in which the heating element unit is used.

  The heating element 2 according to the first embodiment includes a portion that generates heat when a current flows when energized (hereinafter referred to as an energized heat generating portion 2C), and a portion that generates heat due to heat conduction from the energized heat generating portion 2C (hereinafter referred to as a heat transfer heat generating portion). 2D). The heating element configured as described above has equivalent heat conduction in the plane direction, that is, so-called two-dimensional isotropic heat conduction. If the heat conductivity of the heating element is less than 200 W / m · K, that is, if the two-dimensional isotropic thermal conductivity is poor, the heat conducted from the energized heat generating portion 2C to the heat transfer heat generating portion 2D Less. As a result, the temperature difference between the energized heat generating portion 2C and the heat transfer heat generating portion 2D increases, and temperature unevenness occurs in the heat generating element.

  The heating element 2 used in the heating element unit according to the first embodiment of the present invention has an excellent two-dimensional structure in which a carbon-based material is a main component and a plurality of layers of film materials are laminated with gaps in the thickness direction. It has isotropic thermal conductivity and is formed of a film-like material having a thermal conductivity of 200 W / m · K or more. Therefore, the heating element 2 becomes a heat source without temperature unevenness due to heat generation and heat conduction in the energization heat generation portion 2C and the heat transfer heat generation portion 2D.

  The film material that is a material of the heating element 2 is a high heat resistance obtained by heat-treating a polymer film or a polymer film to which a filler has been added in an atmosphere at a high temperature, for example, 2400 ° C. or more, and baking to graphitization. It is an oriented graphite film and has a thermal conductivity in the plane direction of 600 to 950 W / m · K. If a powder composed mainly of natural graphite is molded, fired and rolled into a film, the heat conductivity is generally 200 to 400 W / m · K. As described above, the heating element 2 used in Embodiment 1 has excellent two-dimensional isotropic thermal conductivity with a thermal conductivity in the plane direction of 600 to 950 W / m · K.

Here, the two-dimensional isotropic heat conduction refers to heat conduction in all directions on the plane set by the orthogonal X axis and Y axis. Accordingly, in the present invention, the two-dimensional isotropic direction means, for example, one direction (X-axis direction) in the carbon fiber direction in a heating element formed by arranging carbon fibers side by side in the same direction, or knitting carbon fibers into a cloth It does not indicate only the two directions (X-axis direction and Y-axis direction) in the carbon fiber direction of the heating element formed in the above manner.
The film material that is the material of the heating element 2 used in the present invention has a laminated structure, and the surface of the layer in the surface direction has various surface shapes such as a flat surface, an uneven surface, or a waved surface, Gaps are formed between the opposing layers. In this laminated structure of film materials, the image of the formation state of the voids formed between each layer 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 dough It is similar to the cross-sectional shape of a pie obtained by baking. Therefore, the film material which is the material of the heating element 2 in the present invention is a material having two-dimensional isotropic thermal conductivity excellent in the thermal conductivity in the plane direction as described above.

  Polymer films used as film materials manufactured as described above include polyoxadiazole, polybenzothiazole, polybenzobisthiazole, polybenzoxazole, polybenzobisoxazole, and polypyromellitimide (pyromellitimide) , Polyphenylene isophthalamide (phenylene isophthalamide), polyphenylene benzimitazole (phenylene benzimitazole), polyphenylene benzobisimitazole (phenylene benzobisimidazole), polythiazole, polyparaphenylene vinylene Furthermore, at least one kind of polymer film can be mentioned. 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 phosphoric 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 of adipic acid, azelaic acid, sebacic acid, phthalic acid, and the like, and 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 material is laminated, treated at 2400 ° C. or higher in an inert gas, and controlled by adjusting the pressure of the gas treatment atmosphere generated in the process of graphitization to produce a film-like heating element. Furthermore, if necessary, a film-like heating element of higher quality can be obtained by rolling the film-like heating element produced as described above. The film-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 material manufactured as described above is generally processed into a desired shape by a punching die such as a Thomson type or laser processing. 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: 10.600 nm) is used. However, there is a problem that heat cannot be processed by the heat generating element. 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 the first embodiment is a film 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 more, and baked to be graphitized. The material is a highly oriented graphite film 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. When the heating element 2 made of such a material is processed to have a thickness (t) of 100 μm, a maximum width (W1) of 6 mm, a minimum width (W2) of about 2 mm, and a length (L) of 250 mm, for example. When processing into a complicated shape such as the above, it is desirable to use the second harmonic laser processing with a name of 532 nm. As described above, when the laser wavelength in laser processing is shortened, the effect of heat on the heating element 2 is reduced because heat processing approaches chemical processing, and high-precision processing is realized by suppressing the generation of soot and burrs due to processing. it can. However, it is not always necessary to laser process the entire outer shape of the heating element 2, and only one of the wide portion and the narrow portion may be used. For example, when the wide portion is determined by the material shape, only the narrow portion may be laser processed, and it goes without saying that it can be selected as appropriate depending on the heating element material shape.

  A preferred laser processing method is appropriately selected from processing methods having a laser processing wavelength (1064 to 380 nm) mainly composed of the above-mentioned non-thermal processing action, depending on the material of the heating element 2, that is, the thermal conductivity and shape in the surface direction. Needless to say you get. Further, the laser processing method for processing the heating element 2 described above is a heating element unit in another embodiment described later, for example, a hole in the wide portion region of the heating element 22 shown in FIG. Needless to say, it can be used for the incision shown in FIG.

Hereinafter, a specific configuration of the heating element unit according to Embodiment 1 will be described.
The holding blocks 3 provided at both ends of the heating element 2 have a substantially columnar shape and are divided into two semicircular columns. The heating element 2 is arranged between the inner wall surfaces that are opposed to the half-cylindrical holding block 3 divided into two, and the first inner lead wire member 11 </ b> A or the second inner portion is arranged on the outer peripheral surface of the holding block 3. The coil portion 5 of the lead wire member 11B is wound and the heating element 2 is held. With this configuration, the holding block 3 is electrically connected while holding both end portions of the heating element 2. The holding block 3 made of a conductive material has a heat dissipation effect that dissipates heat from the heating element 2 and does not transmit high heat to the coil portion 5 of the first internal lead wire member 11A or the second internal lead wire member 11B. Yes. For example, the material of the holding block 3 is preferably graphite. However, the material of the holding block 3 may be any material having excellent conductivity such as a metal material. In addition, the shape of the holding block 3 is not limited to a cylindrical shape, and may be a shape that is easy to manufacture, such as a rectangular shape. Further, the holding block 3 may have a shape that further enhances the heat dissipation effect, for example, a shape having cooling fins or the like.

  Furthermore, in Embodiment 1 of the embodiment, the configuration example in which the holding block 3 is divided into two parts has been described. However, the holding block may be divided into a plurality of parts to hold the heating element, or may be formed as an integrated product to generate heat. A similar effect can be obtained even in a configuration in which the heating element 2 is inserted by providing a slit corresponding to the thickness of the body.

In addition, in the holding block 3 of Embodiment 1 shown in FIG. 1, it is comprised so that the heat generating body 2 may be hold | maintained by the inner wall surface of the holding block 3 divided into 2, However, A convex part is formed and hold | maintained on an inner wall surface The strength can be further increased.
FIG. 3 is a side view showing a part of the vicinity of the holding block 3A, which is an example of a configuration with increased holding strength, partially broken. The film-like heating element 2 shown in FIG. 3 has a configuration in which a heat-resistant member 12 is sandwiched on one side of its inner wall surface.
The heating element 2 is a material having elasticity in the thickness direction. For this reason, the heating element 2 configured as described above is pressed by the facing surface of the holding block 3A, and the heating element 2 is deformed within its elasticity to form an uneven portion. As a result, even if the heating element 2 generates a large contraction force due to high heat, the heat-resistant member 12 acts as a wedge with respect to the heating element 2, and the heating element 2 is reliably prevented from coming off the holding block 3A. Moreover, it is good also as a structure which provides the convex part or uneven | corrugated | grooved part below the thickness of the heat generating body 2 in at least one part of the opposing inner wall face in 3 A of holding blocks. By configuring in this way, it is possible to prevent the heating element 2 from coming off the holding block 3A.

  In the heating element unit according to the first embodiment configured as described above, when electric power is supplied to the external lead wire 9 led out from both sides of the heating element unit, a current flows through the heating element 2, and the resistance of the heating element 2 Heat is generated. At this time, since the heating element 2 is formed of a material mainly composed of a carbon-based substance, infrared rays are emitted from the heating element 2.

  The heating element 2 in the heating element unit of Embodiment 1 can change the heat dissipation state by changing its surface shape. For example, even if the heating element unit is made of the same film material, by reducing the thickness and increasing the width, the radiation area can be increased without changing the resistance value to increase the radiation energy. It becomes possible.

  As described above, the dimensions of the heating element 2 (see FIG. 2) in the heating element unit of the first embodiment are such that the thickness (t) is 100 μm, the maximum width (W1) is 6 mm, and the minimum width (W2) is The length (L) is about 250 mm (see FIG. 1). The band-shaped portion having the minimum width (W2) is an energized heat generating portion 2C that generates heat when current flows in the heat generating element 2. Further, the protruding portion of the heating element 2 outside the energized heat generating portion 2C is a heat transfer heat generating portion 2D that dissipates heat from the energized heat generating portion 2C.

  The belt-like heating element 2 extending in the longitudinal direction preferably has a length ratio of 5/1 or more in the width direction and the thickness direction. By making the length in the width direction more than five times larger than the length in the thickness direction, the amount of heat released from the surface constituting the width direction becomes significantly larger than the amount of heat released from the surface constituting the thickness direction, and the heating element 2 It can be used as a heat source with high directivity.

  The heating element 2 composed of a carbon-based material as a main component and a film-like material having two-dimensional isotropic heat conduction has high heat generation efficiency, and has a positive characteristic (PTC) in which the resistance value increases as the temperature increases. It is. For this reason, the time from starting heating to reaching the rated temperature is extremely short. Therefore, an inrush current at the time of lighting is generated, but depending on the temperature after the equilibrium, the inrush current is about twice that at the time of equilibrium, and up to 10 times as in the case of a heating element formed of a tungsten wire. Inrush current does not occur. For this reason, the heating element 2 in the heating element unit of Embodiment 1 has a characteristic that flicker is less likely to occur. Moreover, although the lifetime of this heat generating body 2 is based also on use temperature, it is about 10,000 hours. This is about twice the life of a heating element made of tungsten wire.

  At least one kind of polymer film selected from the above-mentioned film materials or the above-mentioned polymer film to which the above-mentioned filler is added is treated in an inert gas at a temperature of 2400 ° C. or more, and a gas treatment generated during the graphitization process The atmospheric pressure is controlled. By controlling in this way, a heating element 2 having a thermal conductivity having a two-dimensional isotropic property and a positive characteristic (PTC) in which the resistance value increases as the temperature increases in temperature characteristics is manufactured. Can do. The heating element 2 manufactured in this way ensures stable heat generation temperature, and can perform stable self-input control with respect to thermal fluctuation when the input voltage is a constant voltage. Heat source.

FIG. 4 is a diagram showing another configuration example of the heating element in the heating element unit according to the first embodiment. 4A to 4I, since the heating element is long, a portion connected to one holding block 3 is shown, and a portion connected to the other holding block 3 is omitted.

  In FIG. 4, the heating element 21 shown in a front view in FIG. 4A has a rectangular belt shape with a constant length in the width direction, and the current I flowing through the heating element 21 flows uniformly in the width direction of the heating element 21. Thus, the surface of the heating element 21 generates heat uniformly.

  The shape of the heating element 22 shown in the front view of FIG. 4B has a shape in which a hole is formed in the region of the wide portion 2A of the heating element 2 shown in FIG. An energization heat generation path is formed on the outer periphery so as to flow to the part. That is, the heating element 22 shown in FIG. 4B is configured such that the energization heating path through which a current flows is longer in a limited heating element unit length. The heating element 22 configured in this way can increase design margins such as input power, temperature, and size.

The shape of the heating element 23 shown in the front view in FIG. 4C is a configuration in which a plurality of holes are arranged in a line in the longitudinal direction in a long heating element having a strip shape. By configuring in this way, a shape having two portions communicating in the longitudinal direction of the heating element 23, that is, a configuration in which two energization heat generation paths are provided. Since it is configured in this manner, the heating element 23 is excellent in shape retention, and is easy to handle without twisting and breaking.
Note that the positions of the holes to be formed are not limited to one line, and the positions of the plurality of holes may be set in consideration of the specification of the object to be heated and the equipment to be incorporated. It is also possible to arrange a plurality of holes.
Further, the hole shape does not have to be the circular shape shown in FIG. 4C, and the specification, standard, logo, etc. of the heating element or the like may be displayed by the hole shape, which affects the effect of the present invention. Not what you want.

  The shape of the heating element 24 shown in a perspective view in FIG. 4D is obtained by modifying the shape of the heat transfer heat generating portion 2D of the heating element 2 shown in FIG. The heat transfer heat generating portion 2D of the heat generating body 2 in FIG. 2 is tongue-like and the tip portion is substantially circular, but the heat generating body 24 shown in FIG. 4 (d) has a tip portion of the heat transfer heat generating portion 24A in the wide portion. The only difference is that it is rectangular. Therefore, the heating element 24 of FIG. 4D has the same effect as the heating element 2 of FIG.

  The shape of the heating element 25 shown in a perspective view in FIG. 4 (e) is obtained by making cuts 25A on both sides of the belt-like heating element 21 shown in FIG. 4 (a). With this configuration, the central portion becomes the energized heat generating portion, and the portions with the cuts 25A on both sides thereof become the heat transfer heat generating portions, and it is possible to form a large heat generating region with a small current with a simple configuration. .

  The shape of the heating element 26 shown in a perspective view in FIG. 4F is formed by bending a part of the heat transfer heating part in the heating element 25 shown in FIG. In the heating element 26 shown in FIG. 4F, every other heat transfer heating part 26A in the thickness direction of the heating element 26 is forward or backward (upward or downward in FIG. 4F). It is bent at a right angle. According to the heating element 26 configured as described above, radiation can be performed also in the thickness direction of the heating element 26.

  A heating element 27 shown in a perspective view in FIG. 4G is formed by a cut-and-raised portion 27A obtained by cutting and raising a part of the conductive heating portion in the heating element 25 shown in FIG. With such a configuration, it is possible to avoid contact with the adjacent conductive heat generating portion, as compared with the heat generating element 25 shown in FIG. As in the case of the heating element 25 in FIG. 4E, the central portion is an energized heat generating portion, and the cut-and-raised portions 27 on both sides thereof are heat transfer heat generating portions. As described above, a large heat generation region can be formed with a small current by the simple configuration shown in FIG.

The shape of the heating element 28 shown in a perspective view in FIG. 4 (h) is provided with tongue-shaped cut-and-raised portions 28A at regular intervals at the center of the belt-like heating element 21 shown in FIG. 4 (a). Is. Note that the shape of the cut-and-raised portion 28A is not limited to a tongue shape, and may be a cut-and-raised shape that can form a heat transfer heat generating portion. With this configuration, both side portions become energized heat generating portions and the central portion becomes a heat transfer heat generating portion, and the design margins such as input power, temperature, and size can be increased.
Also, the heating element 28 in FIG. 4 (h) is excellent in shape retention, like the heating element 23 in FIG. 4 (c), and is easy to handle without twisting and breaking.

  The shape of the heating element 29 shown in (i) of FIG. 4 is obtained by staggering the cuts 29A from both sides. The heating element 29 is configured such that the length of the energization heating part is longer than the limited heating element unit length, and the design margin such as input power, temperature, and size can be increased.

  In the heating element unit according to the first embodiment of the present invention, the heating element is a film having a carbon-based material as a main component, and the thermal conductivity in the plane direction is substantially the same, so-called two-dimensional etc. It has directional heat conduction. In particular, in the heating element unit of the first embodiment, a heating element formed in a film shape having a thermal conductivity of 200 W / m · K or more and a thickness of 300 μm or less is used. For this reason, according to the heating element unit of Embodiment 1, uniform heat generation is possible. Further, in the heating element unit of the first embodiment, the heating element has flexibility, flexibility, and elasticity, so that it is possible to process notches, holes, bends, cuts, and the like, and design margins are increased. A high-temperature heating element can be configured.

In the above description of the first embodiment, the case where the heating element is inserted into the transparent quartz glass tube and the gas is enclosed in the glass tube is used at a high temperature. However, the heating element in the heating element unit of the present invention can use a container other than a glass tube. It is mainly composed of a carbon-based material, has a two-dimensional isotropic thermal conductivity, has flexibility, flexibility, and elasticity, and has a thermal conductivity of 200 W / m · K or more, Film-like heating elements with a thickness of 300 μm or less are not only used at high temperatures (about 1100 ° C.) but also have a lower oxidation amount than other carbon-based heating element materials at around 800 ° C. It is a composition structure. This is because the film-like heating element is densely molded. Therefore, the material of the container for the heating element can be selected according to the use temperature of the heating element. For example, if the heating element is used at 180 ° C. or lower, use a silicon container, and if it is used at 250 ° C. or lower, use a fluororesin container and use it at 800 ° C. or lower. In this case, it is possible to select an insulating material having a heat-resistant temperature allowable range such as a mica material, ceramics, crystallized glass, quartz tube, and heat-resistant glass. Note that at a use temperature of 800 ° C. or lower, it is not necessary to fill the container with gas, and the configuration and shape of the heating element unit can be freely designed according to the purpose of use. For this reason, in the heating element unit used at a service temperature of 800 ° C. or lower, the degree of design freedom can be greatly increased, and the cost can be further reduced.
In addition, about the tube shape in Embodiment 1, although the cross-sectional shape demonstrated it as substantially circular shape, in this invention, it does not necessarily need to be substantially circular shape, square or hexagon etc. according to the specification objective of a heat generating unit. Even if it is an elliptical shape, the same effects as those of the heating unit of the first embodiment can be obtained.

  Further, in the heating element unit according to the first embodiment of the present invention, the heating element has flexibility, flexibility, and elasticity, so depending on the usage form, purpose, etc. of the heating element unit, It goes without saying that the heating element unit can be configured in a tubular shape, a rectangular shape, a curved shape having a curved portion along the longitudinal direction, a circular shape formed in a circular shape, or the like.

Embodiment 2
Hereinafter, the heating element unit according to the second embodiment of the present invention will be described with reference to FIG. FIG. 5 is a front view showing specific examples of various shapes of the heating element in the heating element unit of the second embodiment. In each heating element in FIG. 5, the heating element is long and repeats the same pattern shape, so the right side portion is omitted.

  The heat generating unit of the second embodiment is different from the heat generating unit of the first embodiment described above in the shape of the heat generating element, and the rest is the same as in the first embodiment. Therefore, the shape of the heating element in the heating element unit of the second embodiment will be described, and the description of the first embodiment is applied to the other components.

  The heating element in the heating element unit of Embodiment 2 does not make the temperature distribution in the longitudinal direction and the width direction of the heating element uniform, but changes the temperature distribution. In the heating element in the heating element unit according to the second embodiment, regions having different resistance values in unit length are provided in at least a part of the longitudinal direction. The heating element in the second embodiment is a modification of the heating element 2 described with reference to FIG. 2 in the first embodiment. FIGS. 5A to 5D show various modifications of the heating element in the second embodiment.

  In the heating element 201 shown in FIG. 5A, the central portion is the energized heat generating portion 201A, and a plurality of tongues projecting on both sides (the upper and lower portions of the energized heat generating portion 201A in FIG. 5A). The shape portion is the heat transfer heat generation portion 201B. The wide portions having the heat transfer heat generating portions 201B are arranged in parallel in the longitudinal direction at equal intervals, and the maximum width of the heat generating element 201, that is, the width of the wide portion is Za. All the wide portions in the longitudinal direction have the same width.

  As shown in FIG. 5A, the narrowest widths (Y1, Y2) that are the widths of the energized heat generating portions 201A are different in the regions Xa and Xb having the same distance in the longitudinal direction of the heat generating element 201. That is, the first narrowest width Y1 of the first region Xa is formed narrower than the second narrowest width Y2 of the second region (Y1 <Y2). Thus, since the first narrowest width Y1 is narrower than the second narrowest width Y2 (Y1 <Y2), the resistance value of the first region Xa becomes the resistance value of the second region Xb. Compared to this, the heat generation temperature in the first region Xa increases. As described above, by providing regions having different resistance values, it is possible to set a desired temperature distribution in the longitudinal direction of the heating element 201.

  In the heating element 202 shown in FIG. 5B, the maximum width Zb of the wide portion 202A having the heat transfer heat generation portion is the same, but the interval and shape of the wide portion 202A are different in the longitudinal direction. In the heating element 202, the number of the wide portions 202A formed is different between the third region Xc and the fourth region Xd having the same length in the longitudinal direction. That is, the number of wide portions 202A formed in the third region Xc is larger than the number of wide portions 202A formed in the fourth region Xd. In the example shown in FIG. 5B, the number of wide portions 202A formed in the third region Xc is nine, and the number of wide portions 202A formed in the fourth region Xd is six. In addition, the shape of the wide portion 202A of the third region Xc is narrower in the longitudinal direction than the shape of the wide portion 202A of the fourth region Xd, and the third region Xc is the fourth region Xc. The wide portions 202A are formed with a higher density than the region Xd. Since the third region Xc and the fourth region Xd having different pattern densities are formed in this way, the resistance value of the third region Xc becomes larger than the resistance value of the fourth region Xd, and the third region Xd The heat generation temperature in the region Xc becomes higher. Thus, by providing regions having different resistance values in the longitudinal direction of the heating element 202, it is possible to set a desired temperature distribution in the longitudinal direction of the heating element 202.

  In the heating element 202 shown in FIG. 5B, regions other than the third region Xc are configured in the same manner as the fourth region Xd. However, these arrangements are appropriately determined depending on the set temperature distribution. Be changed.

  In the heating element 203 shown in FIG. 5C, the fifth region Xe and the sixth region Xf having the same distance in the longitudinal direction have different maximum widths. The maximum width Zd of the wide portion 203A of the fifth region Xe is narrower than the maximum width Zc of the wide portion 203B of the sixth region Xf (Zd <Zc). However, the interval in the longitudinal direction of the wide portion 203B in the fifth region Xe is the same as the interval in the longitudinal direction of the wide portion 203B in the sixth region Xf. Thus, only in the fifth region Xe, the maximum width Zd is narrower than other regions (Zd <Zc), so that the heat generation amount of the sixth region Xf is larger than the heat generation amount of the fifth region Xe, The temperature of the sixth region Xf can be made higher than that of the fifth region Xe. In this way, it is possible to set a desired temperature distribution in the longitudinal direction of the heating element.

  In the heating element 204 shown in FIG. 5D, the energized heat generating portion 204A in the seventh region Xg is shifted from the energized heat generating portion 204A in the other region (lower in FIG. 5D). Position). Further, in the seventh region Xg, the shape of the heat transfer heat generation portion 204B formed on both sides of the energization heat generation portion 204A is not a target, and has a shape that is small on the upper side and protrudes greatly on the lower side. Thus, by shifting a partial region of the heating element 204 to one side, the temperature distribution in the width direction as well as the temperature distribution in the longitudinal direction of the heating element 204 can be set.

  Note that the heating element in the heating element unit of the present invention is not limited to the pattern shape shown in FIG. 5, and can be variously changed to a shape whose resistance value can be changed. It goes without saying that the temperature distribution in the longitudinal direction can be changed to a desired state by adding the configuration shown in FIG. 4 to the heating element in the second embodiment.

  In particular, the heating element in the heating element unit of the present invention is mainly composed of a carbon-based material, has a two-dimensional isotropic heat conduction, and has flexibility, flexibility, and elasticity. The film has a thermal conductivity of 200 W / m · K or more and a thickness of 300 μm or less. For this reason, the heating element in the heating element unit of the present invention has a configuration in which desired processing such as notch, hole, bending, cutting and raising can be performed, and can be easily changed as appropriate according to the configuration of the heating element unit. .

Embodiment 3
Hereinafter, the heating element unit according to Embodiment 3 of the present invention will be described with reference to FIG. FIG. 6 is a front view showing specific examples of various shapes of the heating elements in the heating element unit of the third embodiment. In FIG. 6, each heating element has a long shape and is a repetition of the same pattern shape, so the right side portion is omitted.

  The heating element unit according to the third embodiment is different from the heating element unit according to the first embodiment described above in the shape of the heating element, and is otherwise the same as in the first embodiment. Therefore, the shape of the heating element in the heating element unit of the third embodiment will be described, and the description of the first embodiment is applied to the other components.

  The heating element in the heating element unit of Embodiment 3 does not make the temperature distribution in the longitudinal direction and the width direction of the heating element uniform, but changes the temperature distribution. In the heating element in the heating element unit according to the third embodiment, regions having different resistance values in unit length are formed in at least a part of the longitudinal direction. The heating element in the third embodiment is a modification of the heating element 22 described with reference to FIG. 4B in the first embodiment. FIGS. 6A to 6D show various modifications of the heating element in the third embodiment.

  The shape of the heating element 301 shown in FIG. 6A is the same as that of the heating element 2 shown in FIG. 2, in which the regions of the wide portion 301A and the narrow portion 301B are alternately arranged in the longitudinal direction. Yes. A hole is formed in the region of the wide portion 301A, and an energized heat generation path is formed on the outer periphery of the wide portion 301A so that current flows to the end of the wide portion 301A. That is, the heating element 301 shown in FIG. 6A is configured such that the energization heating path through which a current flows is longer in a limited heating element unit length.

  In the heating element 301 shown in FIG. 6A, the wide portions 301A are arranged at equal intervals, and the maximum width is Wa. In the heating element 301 shown in FIG. 6A, the first region Ta and the second region Tb having the same length in the longitudinal direction have different energization heat generation paths. The width t1 of the energization heat generation path in the first region Ta is formed narrower (t1 <t2) than the energization heat generation path t2 in the second region Tb. For this reason, the resistance value of 1st area | region Ta becomes large compared with the resistance value of 2nd area | region Tb. Since the same current flows in the first region Ta and the second region Tb, the heat generation temperature in the first region Ta becomes higher than the heat generation temperature in the second region Xb, and a desired temperature in the longitudinal direction of the heating element 301 is obtained. Distribution can be set.

  In the heating element 302 shown in FIG. 6B, the maximum width Wb of the wide portion 302A is the same, but the interval between the wide portions 302A is different in the longitudinal direction. In the heating element 302, the number of wide portions 302A formed in the third region Tc and the fourth region Td having the same length in the longitudinal direction is different. That is, the number of wide portions 302A formed in the third region Tc is larger than the number of wide portions 302A formed in the fourth region Td. In the example shown in FIG. 6B, the number of wide portions 302A in the third region Tc is six, and the number of wide portions 302A in the fourth region Td is five. As described above, in the heating element 302, the number of the wide portions 302A formed in the third region Tc is large and the number of the wide portions 302A in the fourth region Td is set small. A third region Tc and a fourth region Td having different densities are formed. As a result, the resistance value of the third region Tc is larger than the resistance value of the fourth region Td, and the heat generation temperature of the third region Tc is increased. As described above, by providing regions having different resistance values in the longitudinal direction of the heating element 302, it is possible to set a desired temperature distribution in the longitudinal direction of the heating element 302.

  In the heating element 302 shown in FIG. 6B, regions other than the third region Tc are configured in the same manner as the fourth region Td. However, these arrangements are appropriately determined depending on the set temperature distribution. It can be changed.

  In the heating element 303 shown in FIG. 6C, the fifth region Te and the sixth region Tf having the same distance in the longitudinal direction have different maximum widths. The maximum width Wd of the wide portion 303A of the fifth region Te is narrower than the maximum width Wc of the wide portion 303B of the sixth region Tf (Wd <Wc). However, the interval in the longitudinal direction of the wide portion 303A in the fifth region Te and the interval in the longitudinal direction of the wide portion 303B in the sixth region Tf are the same. Thus, by making the maximum width Wc of the fifth region Te wide part 303A narrower than the wide part of other regions (Wd <Wc), the heat generation amount of the sixth region Tf is the heat generation amount of the fifth region Te. As a result, the temperature of the sixth region Tf can be increased. As described above, by providing regions having different resistance values in the longitudinal direction of the heating element 303, it is possible to set a desired temperature distribution in the longitudinal direction of the heating element 303.

  In the heating element 304 shown in FIG. 6D, the wide portion 304A in the seventh region Tg is shifted from the wide portion 304B in the other region (the position shifted downward in FIG. 6D). Is formed. Further, in the seventh region Tg, the length of the energization heat generation path from the narrow portion 304C in the wide portion 304A is different in both side portions (upper and lower portions in FIG. 6D) of the narrow portion 304C. . That is, the energization heat generation path of the wide part 304A below the narrow part 304C is formed longer than the energization heat generation path of the wide part 304A above the narrow part 304C. Thus, by shifting a partial region of the heating element 304 to one side, the temperature distribution in the width direction as well as the temperature distribution in the longitudinal direction of the heating element 304 can be set.

  The heating element in the heating element unit of the present invention is not limited to the pattern shown in FIG. 6 and can be changed as long as the resistance value can be changed. It goes without saying that the temperature distribution in the longitudinal direction can be changed to a desired state by adding the configuration shown in FIG. 4 to the heating element in the third embodiment.

Embodiment 4
Hereinafter, a heating element unit according to Embodiment 4 of the present invention will be described with reference to FIGS.

FIG. 7 is a perspective view showing the configuration of the heating element unit according to the fourth embodiment of the present invention. FIG. 8 is a perspective view showing a heating element in the heating element unit according to the fourth embodiment. FIG. 9 is a perspective view showing another configuration example of the heating element in the heating element unit according to the fourth embodiment.
The heating element unit according to the fourth embodiment is different from the heating element unit according to the first embodiment in the shape of the heating element, and the heating element has a curved surface. The heating element unit according to the fourth embodiment uses a heating element having a wider heating element described in the first embodiment. In order to insert the heating element in the fourth embodiment into a quartz glass tube that is a heat-resistant tube, at least a part of the cross-sectional shape of the heating element in the direction (width direction) orthogonal to the longitudinal direction is formed as a curved surface. The wide heating element can be easily accommodated in the heat-resistant tube.

As shown in FIG. 7, the heating element unit of the fourth embodiment is similar to the heating element unit of the first embodiment described above, and has a long and thin flat plate heating element 401 as a heat radiator, And holding blocks 3 fixed to both ends. A first internal lead wire member 11A is attached to one holding block 3 (left holding block 3 in FIG. 7), and the other holding block 3 (right holding block 3 in FIG. 7) is attached to the other holding block 3 (right holding block 3 in FIG. 7). A second internal lead wire member 11B is attached. Each of the first internal lead wire member 11 </ b> A and the second internal lead wire member 11 </ b> B is externally led out from both ends of the glass tube 1 through molybdenum foils 8 embedded in welded portions at both end portions of the glass tube 1. The lead wire 9 is electrically connected.
Since the heating element unit of the fourth embodiment has the same configuration except for the heating element in the heating element unit of the first embodiment, the same reference numerals as those of the first embodiment are used for components having the same function and configuration. For the detailed explanation, the explanation in Embodiment 1 is applied.

  As shown in FIG. 8, a heating element 401 in the heating element unit of the fourth embodiment is obtained by forming the heating element 303 of FIG. 6C described in the third embodiment described above on a curved surface. The heating element 401 has an arcuate cross-sectional shape in a direction orthogonal to the longitudinal direction. Flat held end portions 450 are formed at both ends of the heating element 401. The held end portion 450 is a portion that is held and held by the holding block 3 divided into two. In addition, the heating element 401 is formed with a region Va having a narrower maximum width than other regions at a substantially central portion in the longitudinal direction. Therefore, the heat generation amount of the region Va per unit length in the longitudinal direction is smaller than the heat generation amount of the other regions, and the heat generation temperature of the central portion is set low. In this way, regions having different resistance values are provided, and a desired temperature distribution can be set in the longitudinal direction of the heating element 401. In addition, since the cross-sectional shape in the direction orthogonal to the longitudinal direction of the heat generating element 401 in Embodiment 4 is a curved surface, the heat radiation from the heat generating element 401 can be concentrated or diffused. In the fourth embodiment, even if the diameter of the heat-resistant tube using the glass tube 1 is larger than that of the heating element 401, the heating element 401 formed in a curved surface is provided inside the heat-resistant tube to generate heat. It is also possible to exert a function of concentration or diffusion of heat radiation from the body 401. In addition, at least a part of the heating element 401 may be formed as a curved surface so that the function of concentration or diffusion is partially exhibited.

  The heating elements 402, 403, and 404 shown in FIGS. 9A, 9B, and 9C are modifications of the heating element 401 in the fourth embodiment. In these heating elements 402, 403, and 404, similarly to the heating element 401 shown in FIG. 8, the cross-sectional shape in the direction orthogonal to the longitudinal direction is formed in an arc shape, and flat held ends are provided at both ends. A portion 450 is formed.

  A heating element 402 shown in FIG. 9A has wide portions 402A and narrow portions 402B formed alternately and continuously, and a belt-like energization heating portion 402C is formed at the central portion along the longitudinal direction of the heating element 402. Is formed. A hole is formed in the tongue-shaped portion 402D of the wide portion 402A formed on both sides of the energized heat generating portion 402C, and an energized heat generating path is formed so that a current flows through the end of each tongue-shaped portion 402D. Yes.

  Further, in the heating element 402 shown in FIG. 9A, a region Vb having a narrowest maximum width than other regions is formed at a substantially central portion in the longitudinal direction. Therefore, the amount of heat generated in the region Vb is smaller than the amount of heat generated in the other regions, and it is possible to set a desired temperature distribution in the longitudinal direction of the heating element 402 by setting the heat generation temperature of the central portion lower than that of other portions. It becomes.

  The heating element 403 shown in FIG. 9B has wide portions 403A formed at equal intervals across the narrow portion 403B, and a belt-like energization heating portion 403C is formed at the central portion along the longitudinal direction of the heating element 403. Is formed. Further, in the heating element 403 shown in FIG. 9B, a region Vc having a maximum width narrower than other regions is formed at a substantially central portion in the longitudinal direction. Therefore, a desired temperature distribution can be set in the longitudinal direction of the heating element 403.

  In the heating element 404 shown in FIG. 9C, the wide portions 404A are formed at equal intervals with the narrow portion 404B interposed therebetween. In addition, the heating element 404 shown in FIG. 9C forms a region where the shape of the wide portion 404A is different in the region along the longitudinal direction. As shown in FIG. 9C, the region Vd is formed so that the length of the tongue-shaped portion of the wide portion 404A is shorter than the other regions. Further, the region Ve adjacent to the region Vd is formed at a position where the position of the energized heat generating portion 404C is shifted from the other parts. Further, the lengths of the tongue-shaped portions on both sides of the energized heat generating portion 404C in the wide portion 404A of the region Ve are different. Specifically, in the heating element 404 shown in FIG. 9C, the tongue portion on the front side of the wide portion 404A of the region Ve is formed long and is formed on the inner wall surface of a heat-resistant tube such as a quartz glass tube. Accordingly, it is formed in a substantially semicircular arc shape. On the other hand, the tongue-like portion on the back side of the wide portion 404A of the region Ve is formed short. Therefore, a desired temperature distribution can be set in the longitudinal direction of the heating element 404 and the circumferential direction orthogonal to the longitudinal direction.

  The heating element in the heating element unit according to the fourth embodiment of the present invention is in the form of a film containing a carbonaceous material as a main component. Therefore, the heating element in the heating element unit according to the fourth embodiment has a so-called two-dimensional isotropic thermal conductivity that has substantially the same thermal conductivity in the surface direction. Since the heating element in the heating element unit of the fourth embodiment is a material that has flexibility, flexibility, and elasticity and can be processed with high precision, like the heating element used in the fourth embodiment. Various modifications are possible. In the heating element according to Embodiment 4, when the maximum width is larger than the inner diameter of the heat-resistant tube, it is possible to form a curved surface and arrange the heating element along the inner wall surface of the heat-resistant tube. Further, even when the maximum width of the heat generating element is smaller than the inner diameter of the heat-resistant tube, various shapes of heat generating elements having curved surfaces described in Embodiment 4 are used for the purpose of concentration and diffusion of heat radiation from the heat generating element. It is also possible to use it.

  In the heating element unit according to the fourth embodiment, by providing the heating element with a curved portion, the shape (diameter) of the heat-resistant tube that accommodates the heating element is greatly freed from the constraint due to the shape of the heating element. As a result, the heat generating unit of the present invention has a configuration in which the heat capacity can be varied.For example, the temperature rise is quickened by reducing the heat capacity by reducing the heat resistant tube without changing the heat generating element. Is possible.

Further, by disposing the heating element close to the inner wall surface of the heat-resistant tube, it becomes possible to increase the temperature of the inner wall of the heat-resistant tube and increase the heat radiation from the heat-resistant tube.
Furthermore, in a heating element configured with a curved surface, a longitudinal pattern shape and a pattern shape in the width direction are formed in combination and inserted into a heat-resistant tube to constitute a heating element unit, so that only the temperature distribution in the longitudinal direction is formed. In addition, the temperature distribution in the circumferential direction can be set. As a result, according to the present invention, a three-dimensional temperature distribution can be formed, and the use range of the heating element unit of the present invention can be greatly expanded. In the conventional heating element unit, a three-dimensional temperature distribution is configured using a plurality of heating element units. However, according to the present invention, it is possible to construct a similar one with one heating element unit, Space saving and cost reduction can be achieved.

Embodiment 5
Hereinafter, the heating apparatus of Embodiment 5 which concerns on this invention is demonstrated, referring FIG.
The heating device of the fifth embodiment uses the heating element unit of the first to fourth embodiments described above as a heat radiation source. FIG. 10 is a view showing a configuration in which a heating plate unit of the present invention is used as a heat radiation source and a reflecting plate or a reflecting film is provided. FIG. 10 shows a cross-sectional view cut in a direction orthogonal to the extending direction of the heating element unit.

  An example of the heating apparatus according to Embodiment 5 will be described with reference to FIG. The heating device shown in FIG. 10 (a) uses the heating element unit (see FIG. 1) of Embodiment 1 described above as a heat radiation source. The heating device shown in FIGS. 10B and 10C uses the heating element unit of the fourth embodiment described above (see FIG. 7) as a heat radiation source.

  The heating device shown in FIG. 10A is a heating device in which a reflecting plate 51 is provided at a position facing the flat portion of the heating element 2 in the heating element unit 50. The reflecting plate 51 has a parabolic shape in cross section perpendicular to the longitudinal direction (extending direction), and the heating element 2 is disposed at a substantially focal position on the parabola of the reflecting plate 51. In this heating device, a heat radiation source is constituted by the heating element unit 50 and the reflecting plate 51 as a reflecting means.

  In the heating device of the fifth embodiment, in addition to the heating element unit 50 that is the heat radiation source shown in FIG. 10, a power supply unit that supplies power to the heating element unit 50, a control unit that controls the power, and the appearance of the device The component generally used in heating apparatuses, such as the housing | casing which forms is included. Regarding the heating device of the fifth embodiment, the heating element unit and the reflection means, which are the heat radiation source, which are the features of the heating device of the present invention, will be described in detail.

  In the heating device of the fifth embodiment, the heating element 2 used in the heating element unit 50 has a so-called two-dimensional isotropic property in which the heat conductivity in the surface direction is the same as a main component of a carbonaceous material. It is formed in a strip shape from a film-like material having heat conduction. For this reason, the amount of heat radiated from the flat surface portion of the heating element 2 shows a significantly larger value than the amount of heat radiated from the width surface portion (surface constituting the thickness). That is, the heating element 2 is a heat radiator having directivity. Therefore, by providing the reflecting plate 51 at a position facing the flat portion of the heating element 2, the heat rays radiated from the back surface of the heating element 2 are reflected by the reflecting plate 51, and the object to be heated is in front of the reflecting plate 51. Can be efficiently heated.

  In the heating device shown in FIG. 10A, a reflecting plate 51 is disposed at a position on the back side facing the flat portion of the heating element in the heating element unit 50, and is orthogonal to the longitudinal direction of the reflecting plate 51. The cross-sectional shape is a parabolic shape, and the heat generation center of the heating element 2 that is a heat radiation source is disposed at the focal point of the reflector 51. As described above, since the heat generation center of the heating element 2 is located at the focal point of the reflecting plate 51, the heating device shown in FIG. 10 (a) reflects the radiant heat from the heating element 2 by the reflecting plate 51 and generates parallel heat rays. Thus, highly efficient heat radiation is possible.

  The heating device shown in FIG. 10 (b) uses the heating element unit (see FIG. 7) of Embodiment 4 described above as a heat radiation source, and the heating element 401 in the heating element unit has a concave surface portion. A reflecting plate 53 is provided at an opposing position. The reflecting plate 53 has a parabolic shape in cross section perpendicular to the longitudinal direction (extending direction), and the heating element 401 is disposed at a substantially focal position on the parabolic surface of the reflecting plate 53. In addition, the reflecting plate 53 has a convex portion 53 </ b> A at a central portion facing the heating element unit 52 in a cross-sectional shape orthogonal to the longitudinal direction (extending direction). In this heating device, a heat radiation source is constituted by the heating element unit 52 and the reflection plate 53 as the reflection means.

  In the heat radiation source of the heating device configured as shown in FIG. 10B, the convex surface of the heating element 401 faces the direction of the object to be heated, so that a wide range on the front side of the heat radiation source is heated. It becomes possible to do. A part of the heat rays radiated from the concave surface of the heating element 401 to the reflecting plate 53 is reflected by the reflecting surface of the convex portion 53A of the reflecting plate 53, re-reflects at the end portion of the reflecting plate 53, and forwards. Radiated. For this reason, in the heat radiation source of the heating apparatus shown in FIG. 10B, it is possible to heat the wide range on the front side of the reflecting plate 53 substantially uniformly. Further, since the convex portion 53A is formed on the reflecting plate 53 and is disposed near the glass tube which is a heat-resistant tube, the heat radiation from the glass tube surface is reflected and the reflecting plate 53 approaches the heating element 401. Therefore, it becomes an excellent heat radiation source capable of performing more heat radiation.

  As described above, in the heating apparatus shown in FIG. 10B, the reflector 53 is disposed at a position facing the curved concave side portion of the heating element 401 in the heating element unit 52, and the curved concave side portion thereof. A convex portion 53A that protrudes in the direction of the heating element 401 is formed at the center position of the reflection plate 53 facing the central portion in the longitudinal direction. The heat rays incident on the convex portion 53A of the reflection plate 53 are configured to reflect in a direction other than the heating element, enter the reflection plate 53 again, and re-reflect to the front side. In the heating apparatus configured as described above, the radiant heat from the heating element 401 is efficiently radiated to the front side by the reflecting surface of the convex portion 53A. Furthermore, since at least a part of the heating element 401 is covered with the glass tube 1, the temperature of the heating element 401 becomes high, and the temperature distribution of the heating region can be adjusted by the heating device.

Further, in the heating device shown in FIG. 10B, the reflecting plate 53 is disposed on the back side of the heating element 401 of the heating element unit 52, and the heat rays reflected by the reflecting plate 53 cause the heating element 401 to be heated. Since the reflection plate 53 is configured so as not to irradiate, it is possible to prevent a temperature rise due to secondary heating by the reflection plate 53 with respect to the heating element 401, and to realize a heating device with stable specifications without variation. be able to. The heating element 401 used in the heating element unit 52 has a rate of change in resistance that varies depending on the temperature of the heating element itself. Moreover, the setting of the rating of the heating element unit 52 is often set considering only the self-heat radiation of the heating element unit 52. When the heating element unit 52 set in this way is incorporated in the heating device, the rating of the heating device changes when the temperature of the heating element 401 rises due to the heat rays from the reflection plate 53 due to the shape of the reflection plate 53. Therefore, since the heating device shown in FIG. 10B is configured so that the heating element 401 is not irradiated by the reflecting plate 53, the rating of the heating element unit 52 is not affected by the reflecting plate 401, It becomes easy to design a heating apparatus that surely has a preset desired specification.
As described above, a heating device with high radiation efficiency can be constructed by providing the reflectors 51 and 53, which are reflecting means, in the heating element units 50 and 52.

  In addition, although the reflective surface shape of the reflecting plates 51 and 53 shown in FIGS. 10A and 10B has been described as a curved surface shape having a parabolic surface in which heat reflection is parallel, as the reflecting plate in the present invention, It is not limited to such a configuration, but various shapes such as an arc shape, a curved surface shape capable of diffusive reflection that spreads radiant heat from a heating element, and a multi-stage bent surface capable of diffusive reflection are provided depending on the object to be heated Aggregated shapes and the like can also be configured.

Moreover, although the convex part 53A of the reflecting plate 53 shown in FIG. 10 (b) has been described as having a triangular shape, the present invention is not limited to such a shape, and an arc surface, diffuse reflection is possible. A curved surface shape, a shape in which multi-stage bent surfaces capable of diffuse reflection can be assembled, and the like can also be configured.
Note that the heating element units 50 and 52 shown in FIGS. 10A and 10B are arranged inside the reflection plates 51 and 53 so as not to protrude from the side end portions of the reflection plates 51 and 53. By arranging the heating element unit inside the reflectors 51 and 53 in this way, reflection by the reflectors 51 and 53 (including diffuse radiation from the convex portion 53A and turbulent radiation from the concave surface) is efficiently performed. be able to.

Moreover, as a material of the reflectors 51 and 53, aluminum, aluminum alloy, various stainless steels, etc. can be used. Needless to say, the reflective surfaces of the reflective plates 51 and 53 should be coated with a reflective material having a high reflection efficiency or surface-treated to increase the reflectivity of the reflective plates 51 and 53.
In addition, the cross-sectional shape orthogonal to the longitudinal direction (extending direction) in the reflectors 51 and 53 is not limited to a parabolic shape. In the present invention, at least radiant heat from the back surface of the heating element is used as the front surface of the heating element. Any shape that can heat the object to be heated arranged on the side, for example, a curved surface shape, a polygonal shape, or the like can be applied.

  The heating device shown in (c) of FIG. 10 uses the heating element unit (see FIG. 7) of Embodiment 4 described above as a heat radiation source, and the reflective film 55 is formed on the glass tube 1 of this heating element unit. Is formed. The reflective film 55 is a position facing the concave surface portion of the heating element 401 on the outer peripheral surface of the glass tube 1, and is formed in a substantially half region of the glass tube 1. In this heating apparatus, a heat radiation source is constituted by the heating element unit 54 and the reflection film 55 which is a reflection means. The reflective film 55 is formed by, for example, aluminum vapor deposition, gold transfer, or ceramic coating.

In the heating device shown in FIG. 10C, the reflective film 55 is provided on the back side of the heat generating element 401 in the heat generating unit 54, and the heat radiation from the heat generating element 401 is substantially directed in the same direction by the reflective film 55. It is configured to reflect. For this reason, the heating device shown in (c) of FIG. 10 can efficiently heat the object to be heated. Thus, by providing the reflective film 55 on the back side of the heating element unit 54, the radiant heat radiated to the back side by the reflective film 55 is returned to the heating element 401, and the heating element 401 is heated to a higher temperature. It becomes possible to do. As a result, the heating element 401 can radiate high-energy radiant heat from the convex side of the curved surface in the same direction and efficiently heat the object to be heated.
As described above, by forming the reflection film 55 as the reflection means on the back surface of the glass tube 1, it is possible to construct a small heating device with high radiation efficiency.

Embodiment 6
Hereinafter, the heating apparatus of Embodiment 6 which concerns on this invention is demonstrated, referring FIG.
FIG. 11 is a diagram showing the vicinity of a heating element unit 60 and the like serving as a heat radiation source, taking a copying machine as an example of the heating device of the sixth embodiment. FIG. 11 is a cross-sectional view taken along a direction orthogonal to the longitudinal direction (extending direction) of the heating element unit 60.
A copying machine, which is a heating apparatus according to the sixth embodiment, uses the heating element unit (see FIG. 7) according to the fourth embodiment described above as a heat radiation source. In the copying machine of the sixth embodiment, the heating element unit 60 has a heating element 401 having a curved surface in a cross section perpendicular to the longitudinal direction thereof, and is surrounded by a cylindrical body 61. In addition to the heating element unit shown in FIG. 11, the copying machine that is the heating device of the sixth embodiment has a power supply unit that supplies power, a copying mechanism, a control unit that controls the copying mechanism, and an external appearance of the device. It includes components that are commonly used in copiers, such as a housing to be formed.

Since the heating device of the sixth embodiment is a copying machine, the cylindrical body 61 surrounding the heating element unit 60 is a toner fixing roller. Hereinafter, the cylindrical body 61 will be described as the toner fixing roller 61.
The toner fixing roller 61 and the pressure roller 62 are configured to rotate in contact with each other. A paper 64 carrying a toner 63 having a desired shape is inserted between the toner fixing roller 61 and the pressure roller 62, and is pressed and fixed with heating. Accordingly, the curved convex side of the heating element 401 is opposed to the toner fixing roller 61 and the pressure roller 62 in order to efficiently fix the toner 63 on the paper that is passed between the toner fixing roller 61 and the pressure roller 62. It is arranged to face an area including (toner fixing area). However, the direction in which the convex surface side of the heating element 401 faces is arranged so as to face the upstream side of the toner fixing area, that is, the area ahead of the toner fixing area of the toner fixing roller 61. By disposing the heating element 401 in this way, the toner fixing roller 61 is heated including the part upstream of the toner fixing area, the amount of heat stored in the part is increased, and the amount of heat radiated from the heating element 401 is increased. It can be effectively used for toner fixing.

In the heating device of the sixth embodiment, the cylindrical body that is the toner fixing roller 61 disposed so as to surround the heat generating unit 60 radiates heat radiated from the heat generating unit 60 in a desired direction. Yes, the region facing the center of the convex surface of the heating element 401 is the center of heat radiation. Although this cylindrical body (61) was demonstrated in the example comprised with the integral object, you may comprise combining several members.
As described above, in the copying machine that is the heating apparatus according to the sixth embodiment, it is possible to effectively arrange the heat generating unit 60 having directivity to provide a highly efficient heat radiation source.

  Next, a temperature control method in the heating apparatus according to the sixth embodiment will be described with reference to FIG. FIG. 12 is a diagram illustrating a schematic configuration of a temperature control device in the heating device according to the sixth embodiment.

  The electric power supplied from the power supply 67 is controlled by the control unit 66 in accordance with an instruction from the user, and the heating element unit 60 is energized. The heating element 401 of the energized heating element unit 60 generates a high temperature and raises the temperature of the toner fixing roller 61 to a predetermined temperature (toner fixing temperature). The toner fixing roller 61 is provided with a sensor unit 65 to detect the temperature of the toner fixing roller 61. The sensor unit 65 feeds back the detected temperature of the toner fixing roller 61 to the control unit 66, and the control unit 66 controls the power to the heating element unit 60 to adjust the temperature of the toner fixing roller 61.

  As described above, in the heating device of the sixth embodiment, when energization control of the heating element unit is performed, it is possible to consider the detected temperature as the control condition. As temperature control, for example, on / off control using a temperature detection means such as a thermostat, phase control of an input power source using a temperature detection sensor that senses an accurate temperature, power supply rate control, zero cross control, etc. alone or By combining them, a heating device capable of highly accurate temperature management can be realized.

Therefore, according to the heating device of the sixth embodiment configured as described above, heating with excellent radiation characteristics and high accuracy can be achieved by directivity control based on the arrangement position of the heating element and energization control based on the detected temperature. Temperature control is possible.
In the heating device according to the sixth embodiment, the heating element unit according to the fourth embodiment (see FIG. 7) has been described as an example of the heat radiation source. However, as the heat radiation source, the above-described embodiments are used. Any of the configurations of the described heating element units can be applied, and the same effect can be obtained.

  Further, although the copying machine has been described as the heating device of the sixth embodiment, the heating element unit of the present invention can be used as a heat radiation source for fixing toner in electronic devices such as facsimiles and printers. Play. In electronic devices such as copying machines, facsimile machines, and printers, in the case of a mechanism used for toner fixing, a heating element unit used as a heat radiation source is surrounded and used by a cylinder called a roller.

  In addition to electronic devices such as copying machines, facsimiles, and printers, the heating device of the present invention includes electric heating devices such as heating stoves, cooking devices such as cooking and heating, dryers for food, and the like in a short time. Includes devices that need to be heated to high temperatures.

  In the heating device according to the present invention, the configuration of the roller, which is a cylindrical body surrounding the heating element unit, is formed with a metal material on the inner side and coated with a silicon resin on the outer side. Is provided. In order to enhance the absorption of heat or the like, ceramics, far-red paint, or the like may be provided inside the roller. Furthermore, from the viewpoint of heat dissipation / heat absorption and strength, it is possible to configure a cylindrical body with a plurality of metal members such as aluminum and iron to achieve higher heating efficiency.

  When the heating element unit of the present invention is used in a cooking appliance as a heat source, the heating element unit is surrounded by a cylindrical body. The cylindrical body is a cylindrical heat-resistant tube constituted by one or a plurality of members. When using a heating element unit with a heating element surrounded by a quartz glass tube as a heat source for cooking equipment, the quartz glass tube is filled with alkali metal ions contained in seasonings such as salt and soy sauce used in cooking. Causes devitrification and breakage, and the heat generating unit as a heat source has a short life. For this reason, it is possible to extend the life of the heating element unit by surrounding the heating element unit with a cylindrical body that is a heat-resistant tube.

It should be noted that the usage can be expanded by using crystallized glass having excellent light transmittance, ceramics having a high far-red radiation amount, and the like for the cylindrical body.
Needless to say, the positional relationship between the heating element unit and the object to be heated can be efficiently heated by directing the heating center of the heating element toward the object to be heated.

As described above, in the heating element unit of the present invention, the heating element is a film having a so-called two-dimensional isotropic thermal conductivity, in which the heating element has a carbon-based substance as a main component and has an equivalent thermal conductivity in the plane direction. , Flexibility, flexibility, and elasticity. Further, the heating element has a thermal conductivity of 200 W / m · K or more and a thickness of 300 μm or less. The heating element configured as described above can be easily processed such as notches, holes, bends, cuts, and the like, and the heating element can be easily formed into a shape having a curved cross-sectional shape perpendicular to the longitudinal direction of the heating element. is there. Furthermore, the heating element in the heating element unit of the present invention is formed into a tubular shape, a plate shape, a curved shape obtained by bending the tubular shape in the longitudinal direction, or a tubular shape according to the form of the container (heat-resistant tube) containing the heating element. It can be deformed into various shapes such as a shape that has been made, and can be deformed with high precision according to the purpose of use and incorporated into the apparatus.
Furthermore, in the heating element unit of the present invention, the heating element can be formed in a form suitable for the intended use, and heat radiation can be performed with high efficiency from a flat surface portion or a curved surface portion of the heating element.

  Further, in the heating element unit of the present invention, the heating element has a two-dimensional isotropic heat conduction and is a film having flexibility, flexibility, and elasticity, so that current flows to generate heat. Heat is generated not only in the energized heat generating part but also in parts other than the energized part by heat conduction from the energized heat generating part. For this reason, the heating element can be formed to have a complicated pattern (shape), it is possible to eliminate unevenness in the heating temperature due to some thickness difference in processing, and increase the margin of processing accuracy. Can do.

  In the heating element unit of the present invention, both ends of the cylindrical heat-resistant tube (glass tube 1 shown in FIG. 1) are sealed, and the heat-resistant tube is filled with gas, so that the heating element in the heat-resistant tube is oxidized. Therefore, the design margin of the heating element is expanded. Furthermore, since the heating element used in the present invention has flexibility, flexibility, and elasticity and has high shape retention with respect to high temperature, the heating element can be formed into a desired shape. The degree of freedom in selecting a heat-resistant tube material and in the method of holding the heating element can be increased.

  As described in the fifth embodiment, in the heating apparatus shown in FIG. 10A, a reflector is disposed at a position on the back surface facing the flat portion of the heating element in the heating element unit of the present invention. The cross-sectional shape perpendicular to the longitudinal direction of the reflecting plate is a parabolic shape, and the heat generation center of the heating element as a heat radiation source is disposed at the focal point of the reflecting plate. As described above, since the heat generation center of the heating element is located at the focal point of the reflector, the radiant heat from the heating element is reflected by the reflector in the heating device of the present invention, thereby enabling highly efficient heat radiation.

  As described in the fifth embodiment, in the heating device shown in FIG. 10B, the reflector is disposed at a position facing the curved concave side portion of the heating element in the heating element unit of the present invention. And the convex part which protrudes in the direction of a heat generating body is provided in the center position in the reflecting plate facing the center part of the longitudinal direction of the curved-surface concave side part. The heat rays incident on the convex portion of the reflecting plate are reflected in a direction other than the heating element, are incident on the reflecting plate again, and are reflected again on the front side. In the heating device configured as described above, the radiant heat from the heating element is efficiently radiated to the front side by the reflecting surface of the convex portion. Furthermore, since at least a part of the heating element is covered with the heat-resistant tube, the temperature of the heating element becomes high, and the temperature distribution in the heating region can be adjusted by the heating device of the present invention.

  Further, in the heating device shown in FIG. 10B, a reflection plate is disposed on the back side of the heating element of the heating element unit, and the heat rays reflected by the reflection plate are not reflected on the heating element. Since the plate is configured, it is possible to prevent a temperature rise due to secondary heating by the reflecting plate with respect to the heating element, and it is possible to realize a heating device having stable specifications without variation. The heating element used in the heating element unit has a resistance change rate that varies depending on the temperature of the heating element itself. Moreover, the setting of the rating of the heating element unit is often set considering only the self-heat dissipation of the heating element unit. When the heating element unit set in this way is incorporated in a heating device, the rating of the heating device changes when the temperature of the heating element rises due to the heat rays from the reflection plate due to the shape of the reflection plate. Therefore, since the heating device of the present invention is configured so that the heating element is not irradiated by the reflecting plate, the rating of the heating element unit is not affected by the reflecting plate and surely has a predetermined desired specification. The design of the heating device becomes easy.

  As described in the fifth embodiment, in the heating device shown in FIG. 10C, a reflective film is provided on the back side of the heat generating element in the heat generating unit, and heat from the heat generating element is generated by the reflective film. Since the radiation is reflected substantially in the same direction, the object to be heated can be efficiently heated. As described above, by providing a reflection film on the back side of the heating element unit, the radiant heat radiated to the back side by the reflection film is returned to the heating element, so that the heating element can have a higher temperature. It becomes. As a result, the heating element radiates high-energy radiant heat from the convex side of the curved surface in the same direction, and can efficiently heat the object to be heated.

  Further, in the heating device of the present invention, as described in the above-described sixth embodiment, the heating element unit of the present invention may be provided, and a cylindrical body covering the heating element unit may be provided. It is. By comprising in this way, it is prevented that the foreign material emitted from a to-be-heated object etc., for example, gravy, a seasoning, etc., are obstruct | occluded by a cylinder and contact | connects a heating element unit directly. Thereby, it becomes possible to prevent breakage and disconnection due to the surface deterioration of the heating element unit, and a long-life heating device can be provided.

Furthermore, in the heating device of the present invention, when the heating element unit is used as a heat source of an electronic device such as a copying machine, the cylinder covering the heating element unit is used as a toner fixing roller, and the paper on the toner fixing roller is The contact portion can be heated with high efficiency.
Moreover, in the heating device of the present invention, by providing a configuration in which at least a part of the heating element is covered with a heat-resistant tube, it is possible to increase the heating element temperature and provide a heating device that can change the heating distribution. It becomes possible to do.

  Moreover, in the heating element unit and the heating device of the present invention, the carbon-based substance is a main component, and the heat conduction is two-dimensional isotropic, and has flexibility, flexibility, and elasticity. Furthermore, a film-like heating element having a thermal conductivity of 200 W / m · K or more and a thickness of 300 μm or less is used, and the heating element has a high characteristic of an emissivity of 80% or more.

  Since the heating element unit according to the present invention is small and has high efficiency, it becomes a highly versatile heat source, and a heating device using this heating element unit is useful because it enables efficient heating.

1 Glass tube
2 Heating element 3 Holding block 4 Holding portion 5 Coil portion 6 Spring portion 7 Internal lead wire 8 Molybdenum foil 9 External lead wire 10A First power supply portion 10B Second power supply portion 11A First internal lead wire member 11B First 2 internal lead wire member 12 heat resistant member 50, 52, 54, 60 heating element unit
51, 53 Reflecting plate 55 Reflecting film 61 Cylindrical body 62 Pressure roller

Claims (3)

  It is formed of a polymer film or a graphite film obtained by heat-treating a polymer film to which a filler is added, and has a two-dimensional isotropic thermal conductivity in the plane direction, and a resistance value increases with increasing temperature. A heating element unit comprising a heating element having a temperature characteristic that is a positive characteristic that rises.   2. The heat generating element according to claim 1, wherein the heating element is in the form of a film in which a plurality of film materials are laminated with a gap in the thickness direction, and has a heat conductivity in the plane direction of 200 W / m · K or more. Body unit.   The heating element unit according to claim 2, wherein the heating element has a film shape with a thickness of 300 μm or less.

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