JP2006214662A - Heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating device provided with a glass plate exercising effective action in response to each heating function, on a see-through window. <P>SOLUTION: A metallic plate (see-through window) 18 mounted on an opening/closing means 17 of a heating chamber 10 and having a small hole is provided with the glass plate 19 manufactured by stacking an oxide film 20 of indium and tin, and a fluorine-doped tin oxide film 21. Thus the action of a transparent conductive film and heat-resisting property under high temperature can be secured, uniform heating can be promoted by allowing the glass plate 19 to act as a heat radiating body, and a heated object can be heated with high reliability while saving energy. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a heating apparatus that heats an object to be heated using high frequency, steam, radiant heat, or convective heat.

Conventionally, this type of heating apparatus has a see-through window in the opening / closing means so that the progress of heating of the object to be heated in the heating chamber can be observed. In addition, a glass plate that provides convenience of easy cleaning is disposed on the see-through window. And what has formed the transparent conductive film which permeate | transmits the wavelength of a visible light region to this glass plate is proposed (for example, refer patent document 1).
JP-A-6-68975

  However, the conventional configuration has a problem that when the oxide film of indium and tin, which is a transparent conductive film, is exposed to a high temperature, thermal degradation occurs, and the sheet resistance decreases and the conductive performance decreases. It was. For this reason, for example, when this glass plate is used for a see-through window of a microwave oven, which is one of the heating devices, a transparent conductive film with deteriorated sheet resistance generated at a high temperature in oven cooking performed microwave cooking. In some cases, the glass plate generates heat to a high temperature, and the glass plate is thermally destroyed.

  The present invention solves the above-mentioned conventional problems, and a glass plate that exhibits an effective action corresponding to a high-frequency heating function, a steam heating function, or a heating function using radiant heat or convection heat is arranged in the viewing window. It aims at providing the installed heating device.

  In order to solve the above-mentioned conventional problems, the heating device of the present invention is such that a glass plate on which a fluorine-doped tin oxide film is formed is disposed in a see-through window provided in a heating chamber opening / closing means.

  Accordingly, when heating the heating chamber in a high temperature state, heat rays having a wavelength longer than that of visible light are reflected from the heating chamber to suppress heat loss and promote energy saving during heating. In addition, the film formation has excellent heat resistance characteristics, and in heating using high frequency energy, the high frequency loss hardly changes, and the initial characteristics can be maintained and the film can act as an electromagnetic wave reflection film. For this reason, the glass plate of a transparent window exhibits an effective effect | action corresponding to each heating function, and a heating apparatus can heat a to-be-heated material reliably.

  In the heating device of the present invention, the glass plate of the transparent window exhibits an effective action corresponding to each heating function, and the heating device can heat the object to be heated with high reliability.

  1st invention is provided with the heating chamber which accommodates a to-be-heated material, the opening-and-closing means for putting in and out a to-be-heated material with respect to the said heating chamber, and the see-through window which is provided in the above-mentioned opening-and-closing means and sees through a heating chamber, When the heating chamber is heated at a high temperature by using a glass plate having a fluorine-doped tin oxide film formed on the see-through window, heat rays having a longer wavelength than visible light are heated from the heating chamber. It can be reflected to suppress heat loss and promote energy saving during heating. In addition, the film formation has excellent heat resistance characteristics, and in heating using high frequency energy, the high frequency loss hardly changes, and the initial characteristics can be maintained and the film can act as an electromagnetic wave reflection film. For this reason, the glass plate of a transparent window exhibits an effective effect | action corresponding to each heating function, and a heating apparatus can heat a to-be-heated material reliably.

  According to a second invention, in particular, in the first invention, the glass plate is formed by laminating a fluorine-doped tin oxide film and an oxide film of indium and tin. The fluorine-doped tin oxide film can suppress the thermal deterioration of the oxide film of indium and tin having a high transmittance with respect to the wavelength. Therefore, a high transparency performance is exhibited in a heating apparatus having a combination of various heating functions such as heating the heating chamber in a high temperature state or heating using high-frequency energy.

  According to a third aspect of the invention, in particular, in the first or second aspect of the invention, the see-through window is formed of a metal plate having a plurality of small holes, and a glass plate is disposed on the heating chamber side of the metal plate, thereby In a heating device that uses energy, the metal plate ensures an electromagnetic wave shield, and when the heating chamber is used at a high temperature, the heat dissipation from the small holes is suppressed by film formation formed on the glass plate. Heated material can be efficiently heated to high temperatures.

  In the fourth invention, in particular, in any one of the first to third inventions, when the film forming surface to the glass plate is a glass plate surface opposite to the heating chamber, the opening / closing means is cleaned. In addition to eliminating film damage and ensuring film forming performance, the glass plate stores the heat reflected by the film formation, so that the radiant heat from the opening / closing means is heated when the heating chamber is used at high temperatures. The object to be heated can be uniformly heated.

  In the fifth invention, in particular, in any one of the first to fourth inventions, the film forming range on the glass plate is substantially upper half in the vertical direction of the glass plate in the closed state of the opening / closing means. Thus, heat dissipation from the see-through window facing the upper part of the heating chamber where a high-temperature heat flow stays can be suppressed, and the object to be heated can be efficiently heated. In addition, this type of configuration can exert its function to the maximum by applying it to a heating device having a function of heating the object to be heated by dividing the heating chamber into upper and lower parts and increasing the temperature of the upper part.

  In a sixth aspect of the present invention, in particular, in any one of the first to fourth aspects of the invention, the high frequency generating means for generating the high frequency to be supplied to the heating chamber is provided, and the film is formed in a shape that resonates with the high frequency. Heat generation due to high frequency of film formation can be promoted, and the temperature of the glass plate in the area where film formation is arranged can be raised, and by applying it to a heating device using steam, the condensation of the glass plate is eliminated and the fluoroscopic performance is improved. Can be secured. In addition, it is possible to visually notify the film forming action due to the presence or absence of the film forming arrangement.

  In the seventh aspect of the invention, in particular, in the sixth aspect of the invention, by controlling to radiate high frequency toward the glass plate, the heat generation of the film formation is further promoted and the predetermined region of the glass plate is heated to a high temperature in a short time. In the heating period using steam, it is possible to appropriately supply a high frequency to eliminate the condensation of the glass plate and to ensure the see-through performance.

  In an eighth aspect of the invention, in particular, in any one of the first to sixth aspects of the invention, the glass plate is made of heat-strengthened glass. Can provide windows.

  In the ninth aspect of the invention, in particular, in any one of the first to sixth aspects of the invention, by setting the sheet resistance of the film formation to 10Ω or less, a see-through window having high heat reflection characteristics can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
1 and 2 show a heating device according to Embodiment 1 of the present invention.

  As shown in the figure, the heating device includes a heating chamber 10 forming a heated object storage space 11 for storing an object to be heated, a radiating means 14 for radiating a high frequency in the heated object storage space 11, Opening / closing means 17 for taking in and out the object to be heated from / to the heated object storage space 11, a steam generator 22 for generating steam to be supplied to the object to be heated storage space 11, and hot hot air to the object to be heated storage space 11 And hot air generating means 23 for circulating supply.

  The heating chamber 10 forms a heated object storage space 11 so that the supplied high frequency is electrically confined by each wall surface formed of a metal material. On the bottom surface of the object-to-be-heated storage space 11, a placing means 12 made of a non-conductive material for placing the object to be heated is disposed. A radiating means 14 having directivity is disposed below the mounting means 12 at a substantially central portion of the bottom wall surface 13 forming the heating chamber 10. The radiating means 14 is disposed on the terminal end side of the waveguide 15 that transmits a high frequency, and a magnetron (not shown) that is a high frequency generating means for generating a high frequency is provided on the other end side of the waveguide 15. Provided. Further, the radiating means 14 is provided with a motor 16 for rotationally driving it.

  In addition, the opening / closing means 17 has a metal plate 18 having a plurality of small holes, which is a see-through window, disposed at the center thereof, and a glass plate 19 disposed inside the heating chamber 10 of the metal plate 18. This glass plate 19 uses glass that has been heat strengthened. On the surface of the glass plate 19 opposite to the heating chamber 10, an oxide film 20 of indium and tin and a fluorine-doped tin oxide film 21 are laminated to form a film. The sheet resistance of this film formation is 10Ω / □ or less. The periphery of the glass plate 19 is fixedly sealed to the metal plate 18 with a silicon putty. The opening / closing means 17 is provided with a decorative board 30 made of transparent glass or resin material.

  The steam generating unit 22 that generates steam to be supplied to the heated object storage space 11 is disposed above the water reservoir 24, a water reservoir 24 that stores the supplied water, a heating unit 25 that heats the water reservoir 24 from below, and the water reservoir 24. A steam cover 26 having a plurality of steam holes covering the water reservoir 24 is formed. The hot air generating means 23 includes a heat generating means 27, an air blowing means 28, a motor 29 for driving the air blowing means 28, and the like, and the heated object storage space 11 is heated to a high temperature of about 300 ° C. by circulating high-temperature air. It is a state.

  In the heating device having such a configuration, the operation of the see-through window of the opening / closing means 17 will be described.

  The oxide film 20 of indium and tin is known as a transparent conductive film having a very high transmittance in the visible light region, but the sheet resistance is thermally deteriorated at a high temperature. Therefore, by laminating the fluorine-doped tin oxide film 21 with little thermal deterioration at high temperature on the oxide film 20 of indium and tin, the action of the transparent conductive film and the heat resistance at high temperature are ensured. It can be applied as a see-through window of a multi-function heating device having a high-frequency heating function, a steam heating function, or an oven heating function using radiant heat or convection heat.

  When heating the object to be heated with the heating chamber 10 at a high temperature of about 300 ° C., the glass plate 19 having a film formed by laminating the oxide film 20 of indium and tin and the fluorine-doped tin oxide film 21 is It can act as a heat reflecting film for wavelengths longer than visible light while having a high transmittance for wavelengths in the visible light region, and can suppress heat loss to the outside of the heating chamber 10 and promote energy saving during heating. .

  In addition, when heating using high-frequency energy, there is almost no thermal deterioration of the film formation, so that the high-frequency loss when the film formation is exposed to high frequency hardly changes with respect to the initial characteristics, and electromagnetic wave reflection Can act as a membrane. For this reason, the heating control using the high frequency energy can be stably executed as in the initial stage.

  In addition, since the metal plate 18 having a plurality of small holes and the glass plate 19 constitute a see-through window, in the heating device using high-frequency energy, the metal plate 18 reliably secures an electromagnetic wave shield and is heated. When the chamber 10 is used in a high temperature state, the object to be heated can be heated more efficiently by reflecting the heat with the metal plate 18 and suppressing the heat dissipation from the small holes with the film formed on the glass plate 19.

  Moreover, since the film forming surface on the glass plate 19 is the glass plate 19 surface opposite to the heating chamber 10, the film forming surface is prevented from being damaged when the opening / closing means 17 is cleaned, and the film forming performance is guaranteed. When the inside of the heated object storage space 11 is used at a high temperature by the glass plate 19 storing the heat reflected by the film formation, the radiant heat is also heated from the opening / closing means 17 like the other wall surfaces of the heating chamber 10. The object to be heated is uniformly heated and applied to the object, and the object to be heated can be heated with energy saving and reliability.

  In addition, it is desirable that the sheet resistance of the film formation is 70Ω or more as the transmittance in the visible light region with respect to the transparency, and it is desirable to maximize the heat reflection characteristics, and is 10Ω / □ or less.

  Further, in the present embodiment, the fluorine-doped tin oxide film 21 and the oxide film 20 of indium and tin are laminated to form a film thickness. Alternatively, a single layer of the fluorine-doped tin oxide film 21 may be formed.

(Embodiment 2)
3 and 4 show a heating apparatus according to Embodiment 2 of the present invention. The same elements as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The heating apparatus in the present embodiment is different from the first embodiment in the arrangement of the film formation on the glass plate 19.

  As shown in the figure, the range of the film forming 31 on the glass plate 19 of the opening / closing means 17 is substantially the upper half in the vertical direction of the glass plate 19 when the opening / closing means 17 is closed. The heating chamber 10 is provided with a heating means 33 for heating the upper wall surface 32, and an oven dish 34 is mounted in the heating chamber 10 so as to heat an object to be heated placed on the oven dish 34. . When this object to be heated is heated, a high-temperature heat flow stays in the upper part of the heating chamber 10. The film formation 31 provided on the glass plate 19 suppresses heat dissipation from the see-through window facing the upper portion of the heating chamber 10 and can efficiently heat the object to be heated.

  In this case, since the inside of the heating chamber 10 can be seen through from the lower half of the glass plate 19, the characteristics of the film forming 31 provided on the upper half of the glass plate 19 should be selected as characteristics giving priority to the heat reflection characteristics. Can do.

  The film formation 31 in the present embodiment is a laminate of the oxide film 20 of indium and tin and the fluorine-doped tin oxide film 21 in the first embodiment, or a single layer of the fluorine-doped tin oxide film 21. Needless to say.

(Embodiment 3)
5 to 7 show a heating apparatus according to Embodiment 3 of the present invention. The same elements as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The heating device in the present embodiment is different from that in the first embodiment in that a film formed on the glass plate 19 generates heat by high frequency.

  As shown in the figure, the film forming 50 on the glass plate 19 of the opening / closing means 17 has a shape that resonates with the high frequency supplied into the heating chamber 10, and a plurality of films 50 are arranged at the approximate center of the glass plate 19. The shape of the film formation 50 is approximately rectangular, and the longitudinal dimension is approximately ½ of the wavelength of the high frequency used. Moreover, the dimension between each film forming 50 shall be 5 mm or more, and it is set as the arrangement | positioning which eliminated the spark generation by a high frequency electric field.

  If a high frequency is supplied to the heating chamber 10 for such a film formation 50, the individual film formation 50 is in a resonance state, and a higher amount of high-frequency energy is accumulated to increase the amount of heat generated by the high frequency, resulting in a high temperature in the film formation region. .

  Further, the high frequency generated by the high frequency generation means 51 causes the radiation means 14 having directivity to rotate and disperse it uniformly in the heating chamber 10, but controls the rotational position of the radiation means 14 to open and close the opening means. It is possible to control the glass plate 19 on the 17th side to emit a high frequency with a directivity.

  A device that operates in this manner can be applied to a heating device that uses steam to eliminate condensation on the glass plate 19 and ensure the see-through performance. In addition, it is possible to visually notify the film forming action due to the presence or absence of the film forming arrangement.

  Further, as shown in FIG. 7, by radiating a high frequency toward the glass plate 19 on the opening / closing means 17 side, the heat generation of the film forming 50 is further promoted and the predetermined region of the glass plate 19 is heated to a high temperature in a short time. can do. And in the apparatus which heats a to-be-heated object using a vapor | steam, steam heating is performed by supplying the high frequency suitably during the heating operation, and making the film-forming 50 generate heat | fever, and the condensation of the glass plate 19 is eliminated. The heating progress of the object to be heated can be seen through.

  As in the second embodiment, the film formation 50 in the present embodiment is a laminate of an oxide film 20 of indium and tin and a fluorine-doped tin oxide film 21 or a single layer of the fluorine-doped tin oxide film 21. Needless to say.

  As described above, in the heating device according to the present invention, the glass plate of the transparent window exhibits an effective action corresponding to each heating function, and the heating device can heat the object to be heated with reliability. Therefore, it can be applied not only to food heating but also to heating devices in industrial fields such as semiconductor devices and cleaning devices.

Sectional drawing of the heating apparatus in Embodiment 1 of this invention Sectional view of the glass plate of the heating device Sectional drawing of the heating apparatus in Embodiment 2 of this invention Front view of the glass plate of the heating device Sectional drawing of the heating apparatus in Embodiment 3 of this invention Front view of the glass plate of the heating device A cross-sectional plan view of the heating device with a part cut away

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Heating chamber 11 Heated object accommodation space 14 Radiation means 17 Opening / closing means 18 Metal plate having a small hole (transparent window)
DESCRIPTION OF SYMBOLS 19 Glass plate 20 Oxide film of indium and tin 21 Fluorine dope tin oxide film 31, 50 Film formation 51 High frequency generation means

Claims (9)

A heating chamber for storing an object to be heated, an opening / closing means for putting the object to be heated in and out of the heating chamber, and a see-through window provided in the opening / closing means for seeing through the heating chamber are provided. A heating device provided with a glass plate formed with a doped tin oxide film. The heating apparatus according to claim 1, wherein the glass plate is formed by laminating a fluorine-doped tin oxide film and an oxide film of indium and tin. The heating device according to claim 1 or 2, wherein the see-through window is formed of a metal plate having a plurality of small holes, and a glass plate is disposed on the heating chamber side of the metal plate. The heating apparatus according to any one of claims 1 to 3, wherein a film forming surface on the glass plate is a glass plate surface opposite to the heating chamber. The heating apparatus according to any one of claims 1 to 4, wherein a film forming range on the glass plate is substantially upper half in a vertical direction of the glass plate in a closed state of the opening / closing means. The heating apparatus according to any one of claims 1 to 4, wherein the heating apparatus includes a high-frequency generating unit that generates a high frequency to be supplied to the heating chamber, and is formed into a film having a shape that resonates with the high frequency. The heating apparatus according to claim 6, wherein the heating apparatus is controlled to radiate a high frequency toward the glass plate. The heating apparatus according to any one of claims 1 to 6, wherein the glass plate is made of heat-strengthened glass. The heating apparatus according to any one of claims 1 to 6, wherein the sheet resistance of the film formation is 10Ω or less.

Images