WO2018179473A1 - Induction-heating cooker and induction-heating cooker production method - Google Patents

Induction-heating cooker and induction-heating cooker production method Download PDF

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Publication number
WO2018179473A1
WO2018179473A1 PCT/JP2017/027205 JP2017027205W WO2018179473A1 WO 2018179473 A1 WO2018179473 A1 WO 2018179473A1 JP 2017027205 W JP2017027205 W JP 2017027205W WO 2018179473 A1 WO2018179473 A1 WO 2018179473A1
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WO
WIPO (PCT)
Prior art keywords
top plate
induction heating
heating cooker
heated
glass
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Application number
PCT/JP2017/027205
Other languages
French (fr)
Japanese (ja)
Inventor
彩加 鈴木
敦 阪本
一義 志智
Original Assignee
パナソニックＩｐマネジメント株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by パナソニックＩｐマネジメント株式会社 filed Critical パナソニックＩｐマネジメント株式会社
Priority to CN201780088010.7A priority Critical patent/CN110383943B/en
Publication of WO2018179473A1 publication Critical patent/WO2018179473A1/en

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12—Cooking devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

Definitions

  • the present disclosure relates to a cooking device for cooking food used in general households.
  • induction cookers that cook food to be cooked
  • induction cookers that perform cooking using electromagnetic induction have become widespread.
  • An induction heating cooker causes an eddy current to flow through a cooking container such as a pan, which is an object to be heated, without using fire as a heating source, thereby causing the cooking container itself to generate heat. Thereby, a to-be-cooked object is cooked. Therefore, the induction heating cooker has high safety and excellent cleaning properties.
  • the top plate of the induction heating cooker has a flat top surface.
  • a cooking container such as a pan that is an object to be heated is placed.
  • a glass top plate is employed as the top plate.
  • a heating cooker equipped with two types of heating sources such as an induction heating coil and a radiant heater is also widespread.
  • the radiant heater is a heating cooker of a type in which the radiant heater itself generates heat and heats an object to be heated by heat conduction. Therefore, in the case of a heating cooker using a radiant heater, the temperature of the top plate is 500 ° C. or higher. For this reason, crystallized glass that is excellent in thermal shock and has a coefficient of thermal expansion close to zero is generally used as a material for the top plate (see, for example, Patent Documents 1 and 2).
  • induction heating cookers that do not use a radiant heater as a heating source and all the heating sources are configured by induction heating coils have become widespread.
  • crystallized glass used for the top plate is manufactured by a special manufacturing method so as to have special characteristics such as a coefficient of thermal expansion of almost zero. Therefore, crystallized glass is very expensive.
  • crystallized glass has a yellowish glass fabric itself. For this reason, when the glass is printed and displayed on the top plate, colors such as white do not appear clearly. Then, in order to improve the design property of a top plate, the induction heating cooking appliance which uses non-crystallized glass is proposed (for example, refer patent document 3).
  • the top plate of the cooking device is required to have thermal shock resistance, which is the performance of glass when it is rapidly cooled after being heated to a high temperature.
  • adopted the glass material which further strengthened the non-crystallized glass is proposed (for example, refer patent document 5).
  • the induction heating cooker having the conventional configuration has room for further improvement in improving safety.
  • the present disclosure provides an induction heating cooker having a top plate that has high thermal shock resistance and is resistant to cracking.
  • An induction heating cooker is disposed in an upper portion of a housing, a top plate on which an object to be heated is placed, a frame that holds the top plate, an interior of the housing, A heating unit for heating the heated object and a control unit for controlling the heating unit are provided.
  • the top plate is made of glass having a surface compressive stress value larger than 25 MPa.
  • the induction cooking device of the present disclosure includes a top plate made of glass with improved strength and thermal shock resistance. Thereby, the crack of a top plate can be suppressed and the induction heating cooking appliance which has higher safety
  • security can be provided.
  • FIG. 1 is an exploded perspective view illustrating an outline of the overall configuration of the induction heating cooker according to the embodiment of the present disclosure.
  • FIG. 2A is an exploded perspective view of the top unit of the induction heating cooker according to the embodiment of the present disclosure.
  • FIG. 2B is a plan view of the top unit.
  • FIG. 2C is a perspective view of the top unit.
  • 2D is a cross-sectional view of the top unit shown in FIG. 2B taken along line 2D-2D.
  • FIG. 3 is a diagram showing the correlation between the surface compressive stress value and thermal shock resistance of borosilicate glass.
  • FIG. 4A is a schematic view of the state of the object to be heated as viewed from the front.
  • FIG. 4A is a schematic view of the state of the object to be heated as viewed from the front.
  • FIG. 4B is a schematic view of the state of the object to be heated as viewed from above.
  • FIG. 5A is a schematic view of the top plate as viewed from the front when the object to be heated is heated.
  • FIG. 5B is a schematic view of the deformation of the top plate when the object to be heated is heated, as viewed from above.
  • FIG. 6A is a cross-sectional view showing an example of a schematic configuration of a frame of the induction heating cooker in the present embodiment.
  • FIG. 6B is a cross-sectional view illustrating a comparative example of a schematic configuration of a frame.
  • FIG. 7A is a plan view of the top unit of the induction heating cooker in the present embodiment. 7B is a cross-sectional view taken along line 7B-7B of the top unit of FIG. 7A.
  • FIG. 8 is a flowchart showing a method for manufacturing the induction heating cooker of the present embodiment.
  • the conventional induction heating cooker employs non-crystallized glass with a small expansion coefficient.
  • non-crystallized glass having a small expansion coefficient has a large thermal deformation in a high temperature range. For this reason, when the object to be heated is cooked at a high temperature, the top plate may be cracked due to thermal deformation of the non-crystallized glass. Therefore, the conventional induction heating cooker cooks the object to be heated while controlling the temperature in a low temperature range. Therefore, the user cannot obtain the satisfaction that the object to be heated is cooked with high heating power.
  • An induction heating cooker includes a housing, a top plate that is disposed on an upper portion of the housing, on which an object to be heated is placed, a frame that holds the top plate, and an interior of the housing And a control section for controlling the heating section and a heating section for heating the object to be heated.
  • the top plate is made of glass having a surface compressive stress value larger than 25 MPa.
  • the top plate is made of glass having a surface compressive stress value larger than 25 MPa.
  • the top plate has high strength and thermal shock resistance.
  • cracking of the top plate can be suppressed.
  • the object to be heated can be cooked by raising the temperature to a high temperature range. Thereby, the user can be satisfied that the object to be heated is cooked with high heating power.
  • the glass constituting the top plate may be composed of borosilicate glass.
  • the top plate is made of borosilicate glass which is non-crystallized glass having high transparency. Therefore, the color printed on the top plate can be expressed beautifully. Thereby, the design property of a top plate improves.
  • the glass constituting the top plate may be physically strengthened by heat.
  • This configuration can enhance the strength and thermal shock resistance of the top plate. Thereby, generation
  • the glass constituting the top plate may have a thermal shock resistance of 300 ° C. or higher.
  • the user in cooking a fried food or the like, the user can cook the object to be heated by raising the temperature to a temperature range where a cooking feeling can be obtained with high heating power.
  • the glass constituting the top plate may have a surface compressive stress value of 55 MPa or less.
  • the top plate has high strength and thermal shock resistance that are necessary when considering the actual use situation (for example, the temperature of the object to be heated). Therefore, the induction heating cooking appliance which satisfies a user's cooking feeling can be provided.
  • the induction heating cooker according to the sixth aspect of the present disclosure has a peripheral portion arranged along the outer periphery of the top plate so that the frame surrounds the end surface portion of the top plate in a plan view of the top plate.
  • the peripheral portion may be configured not to be disposed at the position of the upper surface of the top plate.
  • the frame has a bottom surface portion located below the top plate, and the top plate is bonded to the bottom surface between the top plate and the bottom surface.
  • a member may be provided, and the elastic member may be arranged so as to surround the periphery of the heating unit in a plan view of the top plate.
  • the stress applied to the end surface portion of the top plate during thermal deformation can be distributed to portions other than the end surface portion of the top plate. Thereby, the crack of a top plate can be suppressed.
  • 8th aspect of this indication is a manufacturing method of the induction heating cooking appliance using the top plate comprised from the glass physically strengthened with the heat
  • the manufacturing method of an induction heating cooker arrange
  • the method for manufacturing the induction heating cooker according to the ninth aspect of the present disclosure may further include a step of calculating a correlation between the thermal shock resistance and the surface compressive stress value.
  • the user side which uses an induction heating cooking appliance is demonstrated as a front side (front side or front side), and the opposite side to the user side of an induction heating cooking appliance is set as a back side (back side).
  • the following embodiment is an illustration and can be changed suitably. That is, the present disclosure is not limited by the following embodiments.
  • FIG. 1 is an exploded perspective view showing an outline of the overall configuration of induction heating cooker 100 in the present embodiment.
  • a built-in induction heating cooker 100 that is used by being incorporated in a cabinet of a system kitchen will be described as an example of the induction heating cooker.
  • an induction heating cooker such as a stationary type that is used by being placed on a kitchen table or a desktop type that is used by being placed on a table such as a table.
  • the induction heating cooker 100 of the present embodiment includes a casing 1, a top unit 4 including a top plate 2 and a frame 3.
  • the housing 1 has an opening on the upper side, and stores a control unit 8, a cooling fan 9, a grill cooking chamber 12, and the like which will be described later.
  • the top plate 2 is provided so as to cover an upper opening formed in the housing 1, and an object to be heated is placed on the upper surface side.
  • the frame 3 supports the top plate 2.
  • the housing 1 and the top plate 2 constitute an outer shell of the induction heating cooker 100.
  • the top plate 2 is made of glass such as borosilicate glass strengthened by heat, as will be described later.
  • the top plate 2 is bonded and fixed to the frame 3 by an elastic member such as a silicon adhesive. Thereby, the top plate 2 is supported by the frame 3.
  • the housing 1 accommodates a heating coil 5, a control unit 8, a cooling fan 9, a grill cooking chamber 12, and the like.
  • the heating coil 5 heats an object to be heated placed on the upper surface 2b of the top plate 2 by electromagnetic induction.
  • the induction heating cooker 100 shown in FIG. 1 is illustrated as a three-hole heating cooker having three heating coils 5.
  • the number of heating coils 5 is not limited to three, and may be one, two, four or more, for example.
  • the induction heating cooker 100 includes a temperature detection unit 6 (for example, an infrared sensor) that detects the temperature of the object to be heated.
  • the temperature detection unit 6 is attached to the heating coil 5.
  • the temperature detector 6 and the heating coil 5 constitute a heating coil unit.
  • a plurality of temperature detection units 6 may be provided for one heating coil 5. Thereby, the detection precision of the temperature of a to-be-heated material improves. Furthermore, the temperature detection part 6 is not limited to the infrared sensor which detects infrared rays, You may comprise the thermistor etc. which detect temperature from the electromotive force by a temperature difference.
  • the temperature detectors 6 may be attached to all the heating coils 5.
  • the temperature detection unit 6 of the two heating coils 5 on the front side may be configured by an infrared sensor
  • the temperature detection unit 6 of the heating coil 5 on the rear side may be configured by a thermistor.
  • the casing 1 is provided with an operation unit 7 on the front side, which is operated by the user.
  • the user operates the operation unit 7 and inputs, for example, the heating condition and the heating time of the object to be heated.
  • the to-be-heated object is induction-heated on desired conditions via the heating coil 5.
  • control unit 8 controls the current flowing through the heating coil 5 by an inverter mounted on the control board. Thereby, the control part 8 controls the heating state with respect to a to-be-heated material.
  • the operation unit 7 may be installed on the top unit 4 or below the top unit 4 so that the user operates the operation unit 7 from above the top unit 4.
  • the operation unit 7 may be configured by detecting the capacitance via the top plate 2. Specifically, in the case of the operation unit 7 that detects the electrostatic capacity, a change in the electrostatic capacity is detected based on a resistance value suitable for the material of the top plate 2. Thereby, the operation unit 7 detects the input information by the user.
  • the control unit 8 is cooled by a cooling fan 9 housed in the housing 1.
  • the housing 1 that houses the control unit 8 and the cooling fan 9 is incorporated in a kitchen cabinet 10.
  • the cooling fan 9 draws in air inside the kitchen cabinet 10 through the intake holes 11 formed in the housing 1 and cools the control unit 8 and the like.
  • casing 1 is equipped with an opening part (not shown) in the position corresponding to the opening part 10a of the front side of the kitchen cabinet 10 by the front side. Therefore, the cooling fan 9 draws in air outside the kitchen cabinet 10 through the opening of the housing 1 and cools the control unit 8 and the like.
  • the cooling fan 9 simultaneously cools not only the control unit 8 but also the heating coil 5 and the casing 1 that forms the outer shell of the induction heating cooker 100.
  • the casing 1 of the built-in induction heating cooker 100 normally contains a grill cooking chamber 12 therein.
  • the grill cooking chamber 12 has an opening 12a on the front side, and a grill door 13 is provided so as to cover the opening 12a.
  • the user can open the grill door 13 and put a food such as fish into and out of the grill cooking chamber 12.
  • the induction heating apparatus of the present embodiment is configured.
  • 2A to 2C are an exploded perspective view, a plan view, and a perspective view of the top unit 4, respectively.
  • 2D is a cross-sectional view of the top unit 4 shown in FIG. 2B taken along line 2D-2D.
  • the top unit 4 is mainly composed of a top plate 2 and a frame 3 for holding the top plate 2 as shown in FIG. 2A.
  • the frame 3 includes an under frame 3a (bottom surface portion), a side frame 3b (peripheral portion), a back frame 3c, and the like.
  • the under frame 3 a constitutes the bottom surface of the frame 3 and holds the lower surface of the top plate 2.
  • the side frame 3 b constitutes a peripheral portion of the frame 3 and is disposed so as to surround the outer periphery of the top plate 2.
  • the back frame 3 c is disposed on the rear side of the top surface of the top unit 4.
  • the back frame 3c includes an exhaust port 15 that exhausts cooling air from the cooling fan 9 (see FIG. 1).
  • a back grille 16 having a plurality of holes formed thereon is disposed at the exhaust port 15. The back grill 16 discharges the exhaust from the exhaust port 15 upward.
  • the top plate 2 is placed on the under frame 3a and bonded and fixed to the under frame 3a through an elastic member such as a silicon adhesive 14, for example.
  • the end surface 2a of the top plate 2 is surrounded by the side frame 3b, and is bonded and fixed to the side frame 3b through an elastic member such as a silicon adhesive 14, for example.
  • the under frame 3a and the side frame 3b are simply fitted using, for example, fitting claws.
  • top plate 2 and the back frame 3c are similarly bonded and fixed to each other via an elastic member such as a silicon adhesive 14, for example.
  • the back frame 3c and the under frame 3a are simply fitted using fitting claws or the like, similarly to the side frame 3b.
  • the under frame 3a and the back frame 3c may be configured to be assembled with, for example, screws other than the fitting claws.
  • the top unit 4 is configured.
  • top plate 2 a method for forming the top plate 2 will be described.
  • the glass is cut into a predetermined size corresponding to the top plate 2. Thereafter, the cut end face 2 a of the glass is polished to form the top plate 2. At this time, it is preferable that the end surface portion 2a of the top plate 2 is polished with a fine polishing particle having a small particle diameter, for example, a particle size # 100 to # 240 or more. Thereby, for example, cracks and unevenness that are likely to be the starting point of cracking can be eliminated, and the end surface portion 2a of the top plate 2 can be finished with a clean surface.
  • the top plate 2 is subjected to a strengthening process by heat, for example, which will be described later. Thereby, reinforcement
  • the top plate 2 having a predetermined strength is formed.
  • FIG. 3 is a diagram showing the correlation between the surface compressive stress value and thermal shock resistance of borosilicate glass.
  • Borosilicate glass is a glass that is composed of SiO 2 , Al 2 O 3 , B 2 O 5 , Na 2 O 3 , and the like and has a composition ratio of these components within a predetermined range.
  • a predetermined heat treatment was performed on the borosilicate glass to strengthen the surface compressive stress, thereby preparing a test piece.
  • the physical strengthening treatment was performed by firing the borosilicate glass at a temperature of about 700 ° C. at maximum and quenching it.
  • a plurality of glasses having different surface compressive stress values were prepared by changing the firing temperature.
  • borosilicate glass test pieces having different surface compressive stress values were produced by changing, for example, the firing temperature and firing time as the heat strengthening treatment conditions for the borosilicate glass.
  • a glass of a test piece having a size of 250 mm square and a thickness of about 4 mm was produced.
  • the end face of the glass of the produced test piece is enhanced in characteristics such as thermal shock resistance by heat treatment after polishing.
  • the thermal shock resistance test method will be described below.
  • each prepared test piece is put in a thermostat maintained at a predetermined temperature, and held in the thermostat until the temperature of the test piece becomes constant.
  • the test piece is taken out from the thermostatic bath.
  • the measured results were plotted as thermal shock resistance ⁇ T (° C.) for different surface compressive stress values. As a result, a correlation result between the surface compressive stress value and the thermal shock resistance as shown in FIG. 3 was obtained.
  • the surface compressive stress value is measured using a test piece of borosilicate glass after stress relaxation. And the thermal shock resistance with respect to the borosilicate glass of the measured surface compressive stress value was measured, and the result shown in FIG. 3 is obtained.
  • the thermal shock resistance increases as the surface compressive stress value of the borosilicate glass increases.
  • an object to be heated by an induction heating cooker is controlled to be heated in a temperature range of about 140 ° C to 300 ° C.
  • the object to be heated is heated at a temperature of 200 ° C. or higher, the user can easily obtain a sense of cooking with high heating power.
  • the user can easily get a sense of cooking with a higher heating power.
  • the user has a strong tendency to heat the object to be heated in the above temperature range.
  • the top plate 2 does not crack. Is required.
  • the top plate 2 is made of glass having a surface compressive stress value of at least 20 MPa or more based on the correlation between the thermal shock resistance and the surface compressive stress value shown in FIG. Specifically, the top plate 2 is configured using borosilicate glass subjected to the above-described heat strengthening treatment as glass.
  • the top plate 2 preferably has a surface compressive stress value of about 60 MPa (not shown) to be extrapolated. If the top plate 2 has a surface compressive stress value of about 60 MPa, the thermal shock resistance when using the induction heating cooker 100 has a sufficient margin.
  • the top plate 2 when there is a possibility that the object to be heated is heated at a high temperature up to 300 ° C., the top plate 2 preferably has a surface compressive stress value larger than 25 MPa. That is, in the case of a surface compressive stress value greater than 25 MPa, the top plate 2 has a thermal shock resistance of 300 ° C. or higher as shown in FIG.
  • the surface compressive stress value of the top plate 2 is about 55 MPa, there is a margin even in consideration of the maximum temperature (for example, 300 ° C.) at which the object to be heated can be heated.
  • the top plate 2 of the present embodiment is made of glass (for example, borosilicate glass) having a surface compressive stress value of at least greater than 25 MPa and less than 55 MPa when the heating temperature is about 300 ° C. at the maximum. It is preferable.
  • FIG. 4A is a schematic view of the heated object 17 as viewed from the front.
  • FIG. 4B is a schematic view of the heated object 17 as viewed from above.
  • FIG. 5A is a schematic view of the deformation of the top plate 2 when the article to be heated 17 is heated as viewed from the front.
  • FIG. 5B is a schematic view of the deformation of the top plate 2 when the article to be heated 17 is heated as viewed from above.
  • the object to be heated 17 when the object to be heated 17 is heated, the object to be heated 17 such as a pan is placed on the cooking surface (upper surface 2b) of the top plate 2.
  • the control part 8 controls an inverter etc., and supplies with electricity to the heating coil 5 (refer FIG. 1).
  • the heating coil 5 generates an eddy current in the object to be heated 17 and heats it.
  • the temperature of the article to be heated 17 rises.
  • the thermal expansion coefficient of the borosilicate glass constituting the top plate 2 is relatively small but not zero. That is, unlike the crystallized glass, the top plate 2 is thermally expanded by heating.
  • the top plate 2 is partially heated. Therefore, the top plate 2 of the heated portion is deformed so as to be lifted upward as shown in FIG. 5A. As a result, a tensile stress 18 is generated in the top plate 2. And the tensile stress 18 is applied also to the end surface part 2a of the top plate 2 as shown in FIG. 5B.
  • the end surface portion 2a of the top plate 2 usually has irregularities such as a crack 19 or a sharp edge portion 20. Therefore, when the tensile stress 18 is applied to the end surface portion 2a, the top plate 2 may be cracked starting from the crack 19 or the edge portion 20.
  • the end surface portion 2a is polished with a fine polishing powder having a small particle diameter. Therefore, the formation of cracks or sharp edge portions on the end surface portion 2a of the top plate 2 is suppressed. As a result, the possibility of occurrence of cracks in the top plate 2 starting from cracks in the end face portion 2a due to the tensile stress 18 can be reduced.
  • the top plate 2 of the present embodiment is made of a heat strengthened borosilicate glass having a surface compressive stress value of 20 MPa to 60 MPa, preferably 25 MPa to 55 MPa. That is, the top plate 2 is composed of borosilicate glass having an increased strength compared to normal borosilicate glass.
  • the top plate 2 of the present embodiment is stronger against the tensile stress 18 than the normal borosilicate glass. Thereby, even if the tensile stress 18 is applied to the top plate 2, it is hard to generate
  • the amount of thermal deformation of the top plate 2 increases as the temperature of the object to be heated 17 increases. Therefore, the tensile stress 18 generated in the end surface portion 2a also increases.
  • the top plate 2 of the present embodiment has a surface compressive stress value of 25 MPa to 55 MPa. Therefore, the top plate 2 has sufficient resistance against the tensile stress 18 generated by heating at about 300 ° C.
  • the induction heating cooker 100 controls heating while constantly detecting the temperature of the object to be heated 17 by the temperature detection unit 6 configured by an infrared sensor.
  • the infrared sensor detects the infrared ray emitted from the heated object 17 and detects the temperature of the heated object 17. Therefore, the temperature detection accuracy is high and the detection speed is also faster than the thermistor that detects the temperature by conduction heat.
  • the infrared sensor quickly detects when the object to be heated 17 is heated to a high temperature, for example. Therefore, the control unit 8 can quickly control the heating stop of the article to be heated 17 based on the detection result of the temperature detection unit 6. Thereby, the rapid rise in the temperature of the top plate 2 due to heat transfer from the object to be heated 17 can be prevented in advance. That is, it is possible to prevent the top plate 2 from being greatly deformed by rapid temperature detection.
  • control unit 8 can control the heating coil 5 so that the temperature of the object to be heated 17 does not fall within a temperature range in which a tensile stress 18 that causes a crack in the end surface portion 2a is generated.
  • the top plate 2 of the present embodiment is further subjected to a heat strengthening process after the end face part 2a is subjected to the polishing process. Therefore, the portion subjected to the polishing treatment is thermally strengthened in the same manner as the other portions. Thereby, the top plate 2 of this Embodiment can make the intensity
  • the top plate 2 of the present embodiment has a high strength against the tensile stress 18, the top plate 2 can be cooked by raising the temperature of the article to be heated 17 to a high temperature range (eg, 250 ° C. to 300 ° C. or higher). Thereby, the user can easily obtain a real feeling that the object to be heated 17 is cooked with high heating power.
  • a high temperature range eg, 250 ° C. to 300 ° C. or higher.
  • the top plate has a large temperature of, for example, 250 ° C. to 300 ° C. when ice water (about 0 ° C.) is applied to the cooking surface of the top plate 2 in heating the object to be heated 17 in a high temperature range. Thermal shock may be applied.
  • the top plate 2 of the present embodiment is configured to have a surface compressive stress of 20 MPa to 60 MPa, preferably 25 MPa to 55 MPa. Therefore, the top plate 2 has a thermal shock resistance of 200 ° C. to 300 ° C. or more. Thereby, the top plate 2 can sufficiently withstand the thermal shock that may be applied by the user.
  • the top plate 2 of the present embodiment is made of an inorganic material on the cooking surface of the upper surface 2b, and a paint that can withstand high temperatures is printed by silk printing. Thereby, it is possible to prevent the cooking surface of the top plate 2 from being scratched and the sliding of the heated object 17 before the heated object 17 is placed.
  • the induction heating cooker 100 of the present embodiment operates and acts.
  • FIG. 6A is a cross-sectional view showing an example of a schematic configuration of the frame 3 that supports the top plate 2 in the present embodiment.
  • FIG. 6B is a cross-sectional view illustrating a comparative example of a schematic configuration of a frame.
  • the end surface portion 2a of the top plate 2 of the present embodiment is disposed so as to surround the side frame 3b as shown in FIG. 6A. At this time, the side frame 3b does not exist at a position above the top plate 2, that is, the upper surface 2b of the top plate 2 is not covered.
  • the upper end portion of the side frame 3b is bent inward (top plate side) and is disposed so as to wrap around the end surface portion 2a of the top plate 2. .
  • the upper surface 2b of the top plate 2 and the end of the side frame 3b come into contact with each other through the contact portion 21.
  • stress concentration occurs in the contact portion 21. Therefore, there is a possibility that the top plate 2 may break from the contact portion 21 as a starting point.
  • the top plate 2 of the present embodiment is configured such that the side frame 3b does not wrap the top plate 2 as shown in FIG. 6A. That is, the side frame 3 b is configured to be disposed at a position above the upper surface 2 b of the top plate 2.
  • the upper surface 2b of the top plate 2 and the side frame 3b are not in contact with each other via the contact portion 21. That is, stress concentration at the contact portion 21 does not occur on the upper surface 2 b of the top plate 2. Thereby, possibility that the top plate 2 will crack is reduced.
  • the top plate 2 of the present embodiment is composed of borosilicate glass that is highly transparent non-crystallized glass. Therefore, a color such as white printed on the top plate 2 can be clearly expressed. Thereby, the design property of the top plate 2 can be improved more.
  • an inexpensive induction heating cooker 100 can be realized.
  • the induction heating cooker 100 according to the present embodiment can effectively reduce cracks in the top plate 2 even in cooking with high thermal power.
  • an induction heating cooker can be obtained in which the user can feel satisfied that the heat treatment is performed with high heat.
  • FIG. 7A is a plan view of the top unit 4 of the induction heating cooker 100 in the present embodiment.
  • FIG. 7B is a cross-sectional view of the top unit 4 of FIG. 7A taken along line 7B-7B.
  • the underframe 3a constituting the bottom surface portion extends from the outer periphery of the top plate 2 to the vicinity of the periphery of the heating area 22 corresponding to the heating coil 5 (see FIG. 1) in the plan view of the top plate 2.
  • the under frame 3a has an opening 3a1 that encloses at least three heating coils 5. Thereby, except for the upper part of the heating coil 5, the under frame 3a is arrange
  • an elastic member such as a silicon adhesive 14 is disposed between the top plate 2 and the vicinity of the inner periphery of the opening 3a1 of the under frame 3a.
  • the elastic member is disposed so as to surround the heating coil 5 in a plan view of the top plate 2.
  • the elastic member fixes the top plate 2 by adhering it to the under frame 3a.
  • the top unit 4 is configured as described above.
  • the top plate 2 according to the present embodiment is bonded and fixed to the under frame 3a through the silicon adhesive 14 at a position surrounding the periphery of the heating area 22. That is, the top plate 2 is restrained by the under frame 3 a at a position surrounding the periphery of the heating area 22.
  • the tensile stress 18 is also distributed to portions other than the end surface portion 2a of the top plate 2.
  • concentration of the tensile stress 18 on the end surface portion 2a of the top plate 2 is suppressed, and cracking of the top plate 2 is prevented.
  • top plate 2 is restrained by the under frame 3a at a position surrounding the periphery of the heating area 22. Therefore, the thermal deformation of the top plate 2 is reduced.
  • the thermal deformation of the top plate 2 can be reduced. Furthermore, the concentration of the tensile stress 18 on the end surface portion 2a of the top plate 2 can be suppressed. Thereby, the top plate 2 can suppress a crack more effectively.
  • top unit 4 The configuration of the top unit 4 described above is useful for any glass that is thermally expanded. Therefore, it is applicable also to glass other than the borosilicate glass mentioned above.
  • FIG. 8 is a flowchart showing a method for manufacturing induction heating cooker 100 of the present embodiment.
  • top plate 2 of the induction heating cooker 100 of this Embodiment is comprised with the borosilicate glass physically strengthened by the heat mentioned above.
  • heating coil 5 that is a heating unit that heats object to be heated 17 shown in FIG. 1 and control unit 8 that controls heating coil 5 are provided inside casing 1. Arranged (step S01).
  • the heating coil 5 and the control part 8 may be arranged in the housing 1 in a state integrated as the top unit 4.
  • step S02 a correlation between the thermal shock resistance of the top plate 2, for example, borosilicate glass and the surface compressive stress value is calculated. Thereby, the correlation between the thermal shock resistance of borosilicate glass and the surface compressive stress value shown in FIG. 3 is obtained. If the correlation is calculated in advance, step S02 can be omitted.
  • the target surface compressive stress value corresponding to the thermal shock resistance required in the induction heating cooker 100 is specified.
  • the top plate 2 is formed from borosilicate glass having the specified target surface compressive stress value, and incorporated in the housing 1 (step S03).
  • the top plate 2 of the present embodiment is required to have a thermal shock resistance of, for example, 300 ° C. or higher. Therefore, the top plate 2 larger than 25 MPa is specified as the target surface compressive stress value.
  • step S04 it is determined by inspecting whether the top plate 2 incorporated in the housing 1 has a desired target surface compressive stress value (step S04).
  • a desired target surface compressive stress value For example, surface compressive stress values at a plurality of locations on the top plate 2 are measured with a measuring device. And it is performed by confirming whether it is more than a target surface compressive stress value in all the some places.
  • the top plate 2 does not have the desired target surface compressive stress value, that is, if the inspection cannot be cleared (N in step S04), the top plate 2 is replaced with another top plate 2 having the target surface compressive stress value. Steps after S03 are executed.
  • the induction heating cooker 100 is manufactured. Thereby, the crack of the top plate 2 is hard to generate
  • the induction cooking device of the present disclosure can reduce cracks in the top plate even when the object to be heated is heated in a high temperature range. Therefore, it is useful not only for the induction heating cooker incorporated in the kitchen, but also for an induction heating cooker of the type installed on a table.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)
  • Electric Stoves And Ranges (AREA)

Abstract

This induction-heating cooker (100) comprises: a casing (1); a top plate (2) disposed above the casing (1) whereon an object to be heated is placed; a frame (3) holding the top plate (2); a heating coil (5) that is disposed inside the casing (1) and that heats the object to be heated; and a control unit (8) controlling the heating coil (5). The top plate (2) is constituted from glass which has a surface compression stress value of greater than 25 MPa. The induction-heating cooker (100) can thereby be provided with high thermal shock properties, and a top plate that does not crack readily.

Description

誘導加熱調理器および誘導加熱調理器の製造方法Induction heating cooker and method of manufacturing induction heating cooker
　本開示は、一般家庭などで使用される、調理物を調理する加熱調理器に関する。 The present disclosure relates to a cooking device for cooking food used in general households.
　被調理物を加熱調理する調理器として、電磁誘導により加熱調理を行う誘導加熱調理器が普及している。誘導加熱調理器は、加熱源として火を用いずに、被加熱物である鍋などの調理容器に渦電流を流して、調理容器自体を発熱させる。これにより、被調理物を調理する。そのため、誘導加熱調理器は、安全性が高く、かつ清掃性に優れている。 As induction cookers that cook food to be cooked, induction cookers that perform cooking using electromagnetic induction have become widespread. An induction heating cooker causes an eddy current to flow through a cooking container such as a pan, which is an object to be heated, without using fire as a heating source, thereby causing the cooking container itself to generate heat. Thereby, a to-be-cooked object is cooked. Therefore, the induction heating cooker has high safety and excellent cleaning properties.
　誘導加熱調理器のトッププレートは、上面が平坦に形成される。トッププレートは、被加熱物である鍋などの調理容器が載置される。通常、トッププレートとして、ガラス製のトッププレートが採用されている。これにより、高い意匠性や、清掃性を実現している。 The top plate of the induction heating cooker has a flat top surface. On the top plate, a cooking container such as a pan that is an object to be heated is placed. Usually, a glass top plate is employed as the top plate. Thereby, high designability and cleanability are realized.
　また、誘導加熱調理器として、誘導加熱コイルおよびラジエントヒータの二種類の加熱源が搭載された加熱調理器なども普及している。ラジエントヒータは、ラジエントヒータ自体が発熱し、熱伝導により被加熱物を加熱する方式の加熱調理器である。従って、ラジエントヒータを使用する加熱調理器の場合、トッププレートの温度が、５００℃以上になる。そのため、トッププレートの材料として、熱衝撃性に優れ、かつ、熱膨張率がほぼゼロに近い、結晶化ガラスが、一般的に用いられる（例えば、特許文献１、２参照）。 In addition, as an induction heating cooker, a heating cooker equipped with two types of heating sources such as an induction heating coil and a radiant heater is also widespread. The radiant heater is a heating cooker of a type in which the radiant heater itself generates heat and heats an object to be heated by heat conduction. Therefore, in the case of a heating cooker using a radiant heater, the temperature of the top plate is 500 ° C. or higher. For this reason, crystallized glass that is excellent in thermal shock and has a coefficient of thermal expansion close to zero is generally used as a material for the top plate (see, for example, Patent Documents 1 and 2).
　近年、加熱源としてラジエントヒータを用いず、すべての加熱源を誘導加熱コイルで構成した誘導加熱調理器も普及してきている。 In recent years, induction heating cookers that do not use a radiant heater as a heating source and all the heating sources are configured by induction heating coils have become widespread.
　なお、トッププレートに用いられる結晶化ガラスは、熱膨張率がほぼゼロなどの特別な特性を有するように、特別な製法によって製造される。そのため、結晶化ガラスは、非常に高価である。 Note that the crystallized glass used for the top plate is manufactured by a special manufacturing method so as to have special characteristics such as a coefficient of thermal expansion of almost zero. Therefore, crystallized glass is very expensive.
　また、結晶化ガラスは、ガラスの生地自体が、黄色を帯びている。そのため、ガラスに印刷を施して、トッププレート上に表示する場合、白などの色味がきれいに出ない。そこで、トッププレートのデザイン性を向上させるために、非結晶化ガラスを使用する誘導加熱調理器が提案されている（例えば、特許文献３参照）。 Also, crystallized glass has a yellowish glass fabric itself. For this reason, when the glass is printed and displayed on the top plate, colors such as white do not appear clearly. Then, in order to improve the design property of a top plate, the induction heating cooking appliance which uses non-crystallized glass is proposed (for example, refer patent document 3).
　さらに、特に耐熱性の観点から、熱膨張係数が低い非結晶化ガラスを採用した誘導加熱調理器も提案されている（例えば、特許文献４参照）。 Furthermore, particularly from the viewpoint of heat resistance, an induction heating cooker employing non-crystallized glass having a low coefficient of thermal expansion has also been proposed (see, for example, Patent Document 4).
　また、加熱調理器のトッププレートには、高い温度に加熱されてから急激に冷却された場合のガラスの性能である、耐熱衝撃性も要求される。そこで、非結晶化ガラスを、さらに強化したガラス材料を採用した誘導加熱調理器が提案されている（例えば、特許文献５参照）。 Also, the top plate of the cooking device is required to have thermal shock resistance, which is the performance of glass when it is rapidly cooled after being heated to a high temperature. Then, the induction heating cooking appliance which employ | adopted the glass material which further strengthened the non-crystallized glass is proposed (for example, refer patent document 5).
　しかしながら、従来の構成の誘導加熱調理器は、安全性の向上において、さらに改善する余地がある。 However, the induction heating cooker having the conventional configuration has room for further improvement in improving safety.
特開平１１－１００２２９号公報Japanese Patent Laid-Open No. 11-100289 特開２０１４－７６９４５号公報JP 2014-76945 A 特開２０１６－１０３３８５号公報JP 2016-103385 A 国際公開第２０１６／０８８７７８号International Publication No. 2016/088778 特表２０１４－５１９４６４号公報JP-T-2014-519464
　本開示は、高い耐熱衝撃性を有し、割れなどに強いトッププレートを有する誘導加熱調理器を提供する。 The present disclosure provides an induction heating cooker having a top plate that has high thermal shock resistance and is resistant to cracking.
　本開示の誘導加熱調理器は、筐体と、筐体の上部に配置され、被加熱物が載置されるトッププレートと、トッププレートを保持するフレームと、筐体の内部に配置され、被加熱物を加熱する加熱部および加熱部を制御する制御部を備える。そして、トッププレートは、表面圧縮応力値が２５ＭＰａよりも大きいガラスで構成される。 An induction heating cooker according to the present disclosure is disposed in an upper portion of a housing, a top plate on which an object to be heated is placed, a frame that holds the top plate, an interior of the housing, A heating unit for heating the heated object and a control unit for controlling the heating unit are provided. The top plate is made of glass having a surface compressive stress value larger than 25 MPa.
　本開示の誘導加熱調理器は、強度および耐熱衝撃性が向上されたガラスからなるトッププレートを備える。これにより、トッププレートの割れを抑制して、より高い安全性を有する誘導加熱調理器を提供できる。 The induction cooking device of the present disclosure includes a top plate made of glass with improved strength and thermal shock resistance. Thereby, the crack of a top plate can be suppressed and the induction heating cooking appliance which has higher safety | security can be provided.
図１は、本開示の実施の形態における誘導加熱調理器の全体構成の概略を示す分解斜視図である。FIG. 1 is an exploded perspective view illustrating an outline of the overall configuration of the induction heating cooker according to the embodiment of the present disclosure. 図２Ａは、本開示の実施の形態における誘導加熱調理器のトップユニットの分解斜視図である。FIG. 2A is an exploded perspective view of the top unit of the induction heating cooker according to the embodiment of the present disclosure. 図２Ｂは、同トップユニットの平面図である。FIG. 2B is a plan view of the top unit. 図２Ｃは、同トップユニットの斜視図である。FIG. 2C is a perspective view of the top unit. 図２Ｄは、図２Ｂに示すトップユニットを２Ｄ－２Ｄ線で切断した断面図である。2D is a cross-sectional view of the top unit shown in FIG. 2B taken along line 2D-2D. 図３は、ホウケイ酸ガラスの表面圧縮応力値と耐熱衝撃性との相関関係を示す図である。FIG. 3 is a diagram showing the correlation between the surface compressive stress value and thermal shock resistance of borosilicate glass. 図４Ａは、被加熱物が加熱される際の様子を前方から見た概略図である。FIG. 4A is a schematic view of the state of the object to be heated as viewed from the front. 図４Ｂは、被加熱物が加熱される際の様子を上方から見た概略図である。FIG. 4B is a schematic view of the state of the object to be heated as viewed from above. 図５Ａは、被加熱物が加熱された際のトッププレートの変形の様子を前方から見た概略図である。FIG. 5A is a schematic view of the top plate as viewed from the front when the object to be heated is heated. 図５Ｂは、被加熱物が加熱された際のトッププレートの変形の様子を上方から見た概略図である。FIG. 5B is a schematic view of the deformation of the top plate when the object to be heated is heated, as viewed from above. 図６Ａは、本実施の形態における誘導加熱調理器のフレームの概略構成の例を示す断面図である。FIG. 6A is a cross-sectional view showing an example of a schematic configuration of a frame of the induction heating cooker in the present embodiment. 図６Ｂは、フレームの概略構成の比較例を示す断面図である。FIG. 6B is a cross-sectional view illustrating a comparative example of a schematic configuration of a frame. 図７Ａは、本実施の形態における誘導加熱調理器のトップユニットの平面図である。FIG. 7A is a plan view of the top unit of the induction heating cooker in the present embodiment. 図７Ｂは、図７Ａのトップユニットの７Ｂ－７Ｂ線で切断した断面図である。7B is a cross-sectional view taken along line 7B-7B of the top unit of FIG. 7A. 図８は、本実施の形態の誘導加熱調理器の製造方法を示すフローチャートである。FIG. 8 is a flowchart showing a method for manufacturing the induction heating cooker of the present embodiment.
　（本開示の基礎となった知見）
　発明者らは、誘導加熱調理器の安全性をさらに向上させるため、鋭意検討した結果、以下の知見を得た。 (Knowledge that became the basis of this disclosure)
As a result of intensive studies to further improve the safety of induction heating cookers, the inventors have obtained the following knowledge.
　従来の構成の誘導加熱調理器は、膨張係数が小さい非結晶化ガラスを採用している。しかし、膨張係数が小さい非結晶化ガラスでも、高い温度帯においては熱変形が大きくなる。そのため、高温で被加熱物を加熱調理する場合、非結晶化ガラスの熱変形により、トッププレートに割れが発生する虞がある。そこで、従来の誘導加熱調理器は、低い温度帯で温度制御しながら、被加熱物を調理している。そのため、使用者は、被加熱物を高火力で調理しているという満足感が得られない。 The conventional induction heating cooker employs non-crystallized glass with a small expansion coefficient. However, even non-crystallized glass having a small expansion coefficient has a large thermal deformation in a high temperature range. For this reason, when the object to be heated is cooked at a high temperature, the top plate may be cracked due to thermal deformation of the non-crystallized glass. Therefore, the conventional induction heating cooker cooks the object to be heated while controlling the temperature in a low temperature range. Therefore, the user cannot obtain the satisfaction that the object to be heated is cooked with high heating power.
　また、ガラスの有する、高温から急激に冷却された際の耐熱衝撃性と表面圧縮応力値との関係は、これまで不明であった。つまり、実際の調理状況において要求される耐熱衝撃性に対して、ガラスの有する特性が十分でない、可能性がある。 In addition, the relationship between the thermal shock resistance of glass when it is rapidly cooled from high temperature and the surface compressive stress value has been unknown. That is, there is a possibility that the characteristics of the glass are not sufficient for the thermal shock resistance required in actual cooking conditions.
　これらの新規な知見に基づいて、本発明者らは、以下の開示をするに至った。 Based on these new findings, the present inventors have made the following disclosure.
　本開示の第１の態様の誘導加熱調理器は、筐体と、筐体の上部に配置され、被加熱物が載置されるトッププレートと、トッププレートを保持するフレームと、筐体の内部に配置され、被加熱物を加熱する加熱部および加熱部を制御する制御部を備える。そして、トッププレートは、表面圧縮応力値が２５ＭＰａよりも大きいガラスで構成される。 An induction heating cooker according to a first aspect of the present disclosure includes a housing, a top plate that is disposed on an upper portion of the housing, on which an object to be heated is placed, a frame that holds the top plate, and an interior of the housing And a control section for controlling the heating section and a heating section for heating the object to be heated. The top plate is made of glass having a surface compressive stress value larger than 25 MPa.
　この構成によれば、トッププレートは、表面圧縮応力値が２５ＭＰａよりも大きいガラスで構成される。これにより、トッププレートは、高い強度および耐熱衝撃性を有する。その結果、トッププレートの割れを抑制できる。さらに、高い温度域まで温度を上昇させて、被加熱物を調理できる。これにより、使用者は、被加熱物を高火力で調理しているという満足感が得られる。 According to this configuration, the top plate is made of glass having a surface compressive stress value larger than 25 MPa. Thereby, the top plate has high strength and thermal shock resistance. As a result, cracking of the top plate can be suppressed. Furthermore, the object to be heated can be cooked by raising the temperature to a high temperature range. Thereby, the user can be satisfied that the object to be heated is cooked with high heating power.
　本開示の第２の態様の誘導加熱調理器は、トッププレートを構成するガラスを、ホウケイ酸ガラスで構成してもよい。 In the induction heating cooker according to the second aspect of the present disclosure, the glass constituting the top plate may be composed of borosilicate glass.
　この構成によれば、トッププレートを、透明性が高い非結晶化ガラスであるホウケイ酸ガラスで構成する。そのため、トッププレートに印刷される色が、きれいに表現できる。これにより、トッププレートのデザイン性が向上する。 According to this configuration, the top plate is made of borosilicate glass which is non-crystallized glass having high transparency. Therefore, the color printed on the top plate can be expressed beautifully. Thereby, the design property of a top plate improves.
　本開示の第３の態様における誘導加熱調理器は、トッププレートを構成するガラスが、熱によって物理強化されていてもよい。 In the induction heating cooker according to the third aspect of the present disclosure, the glass constituting the top plate may be physically strengthened by heat.
　この構成によれば、トッププレートの強度および耐熱衝撃性を強化できる。これにより、高温調理時におけるトッププレートの割れの発生を抑制できる。 This configuration can enhance the strength and thermal shock resistance of the top plate. Thereby, generation | occurrence | production of the crack of a top plate at the time of high temperature cooking can be suppressed.
　本開示の第４の態様における誘導加熱調理器は、トッププレートを構成するガラスが、３００℃以上の耐熱衝撃性を有していてもよい。 In the induction heating cooker according to the fourth aspect of the present disclosure, the glass constituting the top plate may have a thermal shock resistance of 300 ° C. or higher.
　この構成によれば、炒め物などの調理において、使用者は、高火力での調理感が得られる温度域まで温度を上昇させて、被加熱物を調理できる。 According to this configuration, in cooking a fried food or the like, the user can cook the object to be heated by raising the temperature to a temperature range where a cooking feeling can be obtained with high heating power.
　本開示の第５の態様における誘導加熱調理器は、トッププレートを構成するガラスが、５５ＭＰａ以下の表面圧縮応力値を有してもよい。 In the induction heating cooker according to the fifth aspect of the present disclosure, the glass constituting the top plate may have a surface compressive stress value of 55 MPa or less.
　この構成によれば、トッププレートは、実際の使用状況（例えば、被加熱物の温度）を考慮した際に必要な、高い強度および耐熱衝撃性を有する。そのため、使用者の調理感を満足させる誘導加熱調理器を提供できる。 According to this configuration, the top plate has high strength and thermal shock resistance that are necessary when considering the actual use situation (for example, the temperature of the object to be heated). Therefore, the induction heating cooking appliance which satisfies a user's cooking feeling can be provided.
　本開示の第６の態様における誘導加熱調理器は、フレームが、トッププレートの平面視において、トッププレートの端面部を囲むように、トッププレートの外周に沿って配置される周囲部を、有し、周囲部は、トッププレートの上面の位置に配置しないように構成してもよい。 The induction heating cooker according to the sixth aspect of the present disclosure has a peripheral portion arranged along the outer periphery of the top plate so that the frame surrounds the end surface portion of the top plate in a plan view of the top plate. The peripheral portion may be configured not to be disposed at the position of the upper surface of the top plate.
　この構成によれば、トッププレートの熱変形に起因するトッププレートの端面部とフレームとの接触が抑制される。これにより、接触する部分に起因するトッププレートの割れを抑制できる。 According to this configuration, contact between the end surface of the top plate and the frame due to thermal deformation of the top plate is suppressed. Thereby, the crack of the top plate resulting from the part which contacts can be suppressed.
　本開示の第７の態様における誘導加熱調理器は、フレームが、トッププレートの下方に位置する底面部を有し、トッププレートと底面部との間には、トッププレートを底面部に接着させる弾性部材が設けられ、弾性部材は、トッププレートの平面視において、加熱部の周囲を囲むように配置されていてもよい。 In the induction heating cooker according to the seventh aspect of the present disclosure, the frame has a bottom surface portion located below the top plate, and the top plate is bonded to the bottom surface between the top plate and the bottom surface. A member may be provided, and the elastic member may be arranged so as to surround the periphery of the heating unit in a plan view of the top plate.
　この構成によれば、熱変形の際に、トッププレートの端面部に加わる応力を、トッププレートの端面部以外の部分に分散させることができる。これにより、トッププレートの割れを抑制できる。 According to this configuration, the stress applied to the end surface portion of the top plate during thermal deformation can be distributed to portions other than the end surface portion of the top plate. Thereby, the crack of a top plate can be suppressed.
　本開示の第８の態様は、熱によって物理強化されたガラスから構成されるトッププレートを用いた誘導加熱調理器の製造方法である。そして、誘導加熱調理器の製造方法は、筐体の内部に、被加熱物を加熱する加熱部および加熱部を制御する制御部を配置するステップと、ガラスにおける耐熱衝撃性と表面圧縮応力値との相関関係に基づいて、誘導加熱調理器において必要とされる耐熱衝撃性に対応する目標表面圧縮応力値を特定し、特定した目標表面圧縮応力値を有するトッププレートを、筐体に組み込むステップと、を含む。 8th aspect of this indication is a manufacturing method of the induction heating cooking appliance using the top plate comprised from the glass physically strengthened with the heat | fever. And the manufacturing method of an induction heating cooker arrange | positions the heating part which heats a to-be-heated object, and the control part which controls a heating part in the inside of a housing | casing, and the thermal shock resistance and surface compressive stress value in glass Identifying a target surface compressive stress value corresponding to the thermal shock resistance required in the induction heating cooker based on the correlation, and incorporating a top plate having the specified target surface compressive stress value into the housing; ,including.
　この製造方法によれば、割れ難いトッププレートを備え、かつ、高いデザイン性を有する誘導加熱調理器を作製できる。 According to this manufacturing method, it is possible to produce an induction heating cooker having a top plate that is difficult to break and having high design.
　本開示の第９の態様における誘導加熱調理器の製造方法は、さらに、耐熱衝撃性と表面圧縮応力値との相関関係を算出するステップを含んでいてもよい。 The method for manufacturing the induction heating cooker according to the ninth aspect of the present disclosure may further include a step of calculating a correlation between the thermal shock resistance and the surface compressive stress value.
　以下、本開示の実施の形態について、図面を参照しながら説明する。なお、実施の形態では、誘導加熱調理器を使用する使用者側を前側（正面側または前面側）、誘導加熱調理器の使用者側と反対側を後側（背面側）として説明する。また、以下の実施の形態は例示であり、適宜変更が可能である。つまり、以下の実施の形態によって本開示が限定されるものではない。 Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In addition, in embodiment, the user side which uses an induction heating cooking appliance is demonstrated as a front side (front side or front side), and the opposite side to the user side of an induction heating cooking appliance is set as a back side (back side). Moreover, the following embodiment is an illustration and can be changed suitably. That is, the present disclosure is not limited by the following embodiments.
　（実施の形態）
　［１．誘導加熱調理器の全体構成］
　以下、本実施の形態における誘導加熱装置の構成について、図１を用いて、説明する。 (Embodiment)
[1. Overall configuration of induction heating cooker]
Hereinafter, the structure of the induction heating apparatus in this Embodiment is demonstrated using FIG.
　図１は、本実施の形態における誘導加熱調理器１００の全体構成の概略を示す分解斜視図である。 FIG. 1 is an exploded perspective view showing an outline of the overall configuration of induction heating cooker 100 in the present embodiment.
　以下では、誘導加熱調理器の一例として、システムキッチンのキャビネットに組み込まれて使用される、組み込み型の誘導加熱調理器１００を例に説明する。 Hereinafter, a built-in induction heating cooker 100 that is used by being incorporated in a cabinet of a system kitchen will be described as an example of the induction heating cooker.
　なお、本開示は、キッチン台の上に置いて使用される据置タイプ、または、食卓テーブルなどの卓上に置いて使用される卓上タイプなどの誘導加熱調理器にも適用可能である。 Note that the present disclosure can also be applied to an induction heating cooker such as a stationary type that is used by being placed on a kitchen table or a desktop type that is used by being placed on a table such as a table.
　図１に示すように、本実施の形態の誘導加熱調理器１００は、筐体１と、トッププレート２およびフレーム３から構成されるトップユニット４などを備える。筐体１は、上方に開口を有し、後述する制御部８、冷却ファン９、グリル調理庫１２などを収納する。トッププレート２は、筐体１に形成される上方の開口を覆うように設けられ、上面側に被加熱物が載置される。フレーム３は、トッププレート２を支持する。筐体１およびトッププレート２は、誘導加熱調理器１００の外郭を構成する。 As shown in FIG. 1, the induction heating cooker 100 of the present embodiment includes a casing 1, a top unit 4 including a top plate 2 and a frame 3. The housing 1 has an opening on the upper side, and stores a control unit 8, a cooling fan 9, a grill cooking chamber 12, and the like which will be described later. The top plate 2 is provided so as to cover an upper opening formed in the housing 1, and an object to be heated is placed on the upper surface side. The frame 3 supports the top plate 2. The housing 1 and the top plate 2 constitute an outer shell of the induction heating cooker 100.
　トッププレート２は、後述するように、熱で強化されたホウケイ酸ガラスなどのガラスから構成される。トッププレート２は、例えばシリコン接着剤などの弾性部材によって、フレーム３に接着、固定される。これにより、トッププレート２は、フレーム３によって支持される。 The top plate 2 is made of glass such as borosilicate glass strengthened by heat, as will be described later. The top plate 2 is bonded and fixed to the frame 3 by an elastic member such as a silicon adhesive. Thereby, the top plate 2 is supported by the frame 3.
　筐体１は、内部に、加熱コイル５、制御部８、冷却ファン９およびグリル調理庫１２などを収納する。 The housing 1 accommodates a heating coil 5, a control unit 8, a cooling fan 9, a grill cooking chamber 12, and the like.
　加熱コイル５は、トッププレート２の上面２ｂに載置される被加熱物を、電磁誘導により加熱する。図１に示す誘導加熱調理器１００は、３つの加熱コイル５を有する３口の加熱調理器で図示している。なお、加熱コイル５の個数は、３つに限られず、例えば１つ、２つまたは４つ以上でもよい。 The heating coil 5 heats an object to be heated placed on the upper surface 2b of the top plate 2 by electromagnetic induction. The induction heating cooker 100 shown in FIG. 1 is illustrated as a three-hole heating cooker having three heating coils 5. The number of heating coils 5 is not limited to three, and may be one, two, four or more, for example.
　また、誘導加熱調理器１００は、被加熱物の温度を検知する温度検知部６（例えば、赤外線センサなど）を備える。なお、図１に示す誘導加熱調理器１００では、温度検知部６は、加熱コイル５に取り付けられる。温度検知部６と加熱コイル５は、加熱コイルユニットを構成する。 Moreover, the induction heating cooker 100 includes a temperature detection unit 6 (for example, an infrared sensor) that detects the temperature of the object to be heated. In the induction heating cooker 100 shown in FIG. 1, the temperature detection unit 6 is attached to the heating coil 5. The temperature detector 6 and the heating coil 5 constitute a heating coil unit.
　温度検知部６は、１つの加熱コイル５に対して、複数個設けてもよい。これにより、被加熱物の温度の検知精度が向上する。さらに、温度検知部６は、赤外線を検知する赤外線センサに限定されず、温度差による起電力から温度を検知するサーミスタなどで構成してもよい。 A plurality of temperature detection units 6 may be provided for one heating coil 5. Thereby, the detection precision of the temperature of a to-be-heated material improves. Furthermore, the temperature detection part 6 is not limited to the infrared sensor which detects infrared rays, You may comprise the thermistor etc. which detect temperature from the electromotive force by a temperature difference.
　なお、本実施の形態では、前側の２つの加熱コイル５に温度検知部６を取り付ける構成を例に説明したが、これに限られない。例えば、全ての加熱コイル５に温度検知部６を取り付けてもよい。この場合、例えば前側の２つの加熱コイル５の温度検知部６を赤外線センサで構成し、後側の加熱コイル５の温度検知部６をサーミスタで構成してもよい。また、上記とは、逆の構成としてもよい。 In addition, in this Embodiment, although the structure which attaches the temperature detection part 6 to the two heating coils 5 of the front side was demonstrated to the example, it is not restricted to this. For example, the temperature detectors 6 may be attached to all the heating coils 5. In this case, for example, the temperature detection unit 6 of the two heating coils 5 on the front side may be configured by an infrared sensor, and the temperature detection unit 6 of the heating coil 5 on the rear side may be configured by a thermistor. Moreover, it is good also as a structure contrary to the above.
　また、図１に示すように、筐体１は、前面側に、使用者により入力操作がされる、操作ユニット７が配設される。使用者は、操作ユニット７を操作して、例えば被加熱物の加熱条件、加熱時間などを入力する。これにより、加熱コイル５を介して、被加熱物を、所望の条件で誘導加熱する。 Further, as shown in FIG. 1, the casing 1 is provided with an operation unit 7 on the front side, which is operated by the user. The user operates the operation unit 7 and inputs, for example, the heating condition and the heating time of the object to be heated. Thereby, the to-be-heated object is induction-heated on desired conditions via the heating coil 5. FIG.
　そして、使用者が操作ユニット７を介して入力した情報、および、温度検知部６で検知された温度の情報は、制御部８へ伝えられる。制御部８は、制御基板上に搭載されたインバータによって、加熱コイル５に流れる電流などを制御する。これにより、制御部８は、被加熱物に対する加熱状態を制御する。 Then, information input by the user via the operation unit 7 and information on the temperature detected by the temperature detection unit 6 are transmitted to the control unit 8. The control unit 8 controls the current flowing through the heating coil 5 by an inverter mounted on the control board. Thereby, the control part 8 controls the heating state with respect to a to-be-heated material.
　なお、上記では、操作ユニット７を筐体１の前面側に設ける構成を例に説明したが、これに限られない。例えば、操作ユニット７を、トップユニット４上、またはトップユニット４の下方に設置して、使用者がトップユニット４の上方側から操作ユニット７を操作する構成としてもよい。この場合、トッププレート２を介して、静電容量を検知する方式で、操作ユニット７を構成してもよい。具体的には、上記静電容量を検知する方式の操作ユニット７の場合、トッププレート２の材質に適した抵抗値に基づいて、静電容量の変化を検知する。これにより、操作ユニット７は、使用者による入力情報を検知する。 In the above description, the configuration in which the operation unit 7 is provided on the front side of the housing 1 has been described as an example, but the present invention is not limited to this. For example, the operation unit 7 may be installed on the top unit 4 or below the top unit 4 so that the user operates the operation unit 7 from above the top unit 4. In this case, the operation unit 7 may be configured by detecting the capacitance via the top plate 2. Specifically, in the case of the operation unit 7 that detects the electrostatic capacity, a change in the electrostatic capacity is detected based on a resistance value suitable for the material of the top plate 2. Thereby, the operation unit 7 detects the input information by the user.
　制御部８は、筐体１の内部に収納される冷却ファン９によって冷却される。 The control unit 8 is cooled by a cooling fan 9 housed in the housing 1.
　制御部８および冷却ファン９を収納する筐体１は、キッチンキャビネット１０に組み込まれる。これにより、冷却ファン９は、筐体１に形成された吸気穴１１を通して、キッチンキャビネット１０の内側の空気を吸気し、制御部８などを冷却する。 The housing 1 that houses the control unit 8 and the cooling fan 9 is incorporated in a kitchen cabinet 10. As a result, the cooling fan 9 draws in air inside the kitchen cabinet 10 through the intake holes 11 formed in the housing 1 and cools the control unit 8 and the like.
　また、筐体１は、前面側で、キッチンキャビネット１０の前面側の開口部１０ａに対応する位置に、開口部（図示せず）を備える。そのため、冷却ファン９は、筐体１の開口部を通して、さらにキッチンキャビネット１０の外側の空気を吸気し、制御部８などを冷却する。 Moreover, the housing | casing 1 is equipped with an opening part (not shown) in the position corresponding to the opening part 10a of the front side of the kitchen cabinet 10 by the front side. Therefore, the cooling fan 9 draws in air outside the kitchen cabinet 10 through the opening of the housing 1 and cools the control unit 8 and the like.
　なお、冷却ファン９は、制御部８だけではなく、加熱コイル５、および、誘導加熱調理器１００の外郭を形成する筐体１なども、同時に冷却する。 The cooling fan 9 simultaneously cools not only the control unit 8 but also the heating coil 5 and the casing 1 that forms the outer shell of the induction heating cooker 100.
　また、図１に示すように、本実施の形態の組み込み型の誘導加熱調理器１００の筐体１は、通常、内部に、グリル調理庫１２が収納される。グリル調理庫１２は、前面側に、開口１２ａを有し、開口１２ａを覆うようにグリルドア１３が設けられる。これにより、使用者は、グリルドア１３を開けて、グリル調理庫１２の内部に、例えば魚などの調理物の出し入れが可能になる。 Further, as shown in FIG. 1, the casing 1 of the built-in induction heating cooker 100 according to the present embodiment normally contains a grill cooking chamber 12 therein. The grill cooking chamber 12 has an opening 12a on the front side, and a grill door 13 is provided so as to cover the opening 12a. As a result, the user can open the grill door 13 and put a food such as fish into and out of the grill cooking chamber 12.
　以上のように、本実施の形態の誘導加熱装置は構成される。 As described above, the induction heating apparatus of the present embodiment is configured.
　［２．トップユニットの構成］
　つぎに、本実施の形態の誘導加熱調理器１００のトップユニット４の構成について、図２Ａから図２Ｄを用いて、説明する。 [2. Configuration of top unit]
Next, the configuration of the top unit 4 of the induction heating cooker 100 according to the present embodiment will be described with reference to FIGS. 2A to 2D.
　図２Ａから図２Ｃは、それぞれ、トップユニット４の分解斜視図、平面図および斜視図である。図２Ｄは、図２Ｂに示すトップユニット４を２Ｄ－２Ｄ線で切断した断面図である。 2A to 2C are an exploded perspective view, a plan view, and a perspective view of the top unit 4, respectively. 2D is a cross-sectional view of the top unit 4 shown in FIG. 2B taken along line 2D-2D.
　トップユニット４は、図２Ａに示すように、主に、トッププレート２と、トッププレート２を保持するフレーム３などから構成される。 The top unit 4 is mainly composed of a top plate 2 and a frame 3 for holding the top plate 2 as shown in FIG. 2A.
　フレーム３は、アンダーフレーム３ａ（底面部）と、サイドフレーム３ｂ（周囲部）と、バックフレーム３ｃなどから構成される。 The frame 3 includes an under frame 3a (bottom surface portion), a side frame 3b (peripheral portion), a back frame 3c, and the like.
　アンダーフレーム３ａは、フレーム３の底面部を構成し、トッププレート２の下面を保持する。サイドフレーム３ｂは、フレーム３の周囲部を構成し、トッププレート２の外周を囲むように配置される。バックフレーム３ｃは、トップユニット４の上面の後方側に配置される。 The under frame 3 a constitutes the bottom surface of the frame 3 and holds the lower surface of the top plate 2. The side frame 3 b constitutes a peripheral portion of the frame 3 and is disposed so as to surround the outer periphery of the top plate 2. The back frame 3 c is disposed on the rear side of the top surface of the top unit 4.
　バックフレーム３ｃは、図２Ｂに示すように、冷却ファン９（図１参照）からの冷却風などを排気する排気口１５を備える。排気口１５には、上方に、複数の穴が形成された、バックグリル１６が配置される。バックグリル１６は、排気口１５からの排気を、上方に向けて排出する。 2B, the back frame 3c includes an exhaust port 15 that exhausts cooling air from the cooling fan 9 (see FIG. 1). A back grille 16 having a plurality of holes formed thereon is disposed at the exhaust port 15. The back grill 16 discharges the exhaust from the exhaust port 15 upward.
　トッププレート２は、図２Ａおよび図２Ｃに示すように、アンダーフレーム３ａの上に載置され、例えばシリコン接着剤１４などの弾性部材を介して、アンダーフレーム３ａに接着、固定される。 2A and 2C, the top plate 2 is placed on the under frame 3a and bonded and fixed to the under frame 3a through an elastic member such as a silicon adhesive 14, for example.
　また、トッププレート２の端面部２ａは、図２Ｄに示すように、サイドフレーム３ｂによって囲まれ、例えばシリコン接着剤１４などの弾性部材を介して、サイドフレーム３ｂに接着、固定される。 Further, as shown in FIG. 2D, the end surface 2a of the top plate 2 is surrounded by the side frame 3b, and is bonded and fixed to the side frame 3b through an elastic member such as a silicon adhesive 14, for example.
　アンダーフレーム３ａとサイドフレーム３ｂとは、例えば嵌合爪などを用いて、簡易的に嵌合される。 The under frame 3a and the side frame 3b are simply fitted using, for example, fitting claws.
　また、トッププレート２とバックフレーム３ｃとは、同様に、例えばシリコン接着剤１４などの弾性部材を介して、互いに接着、固定される。 Also, the top plate 2 and the back frame 3c are similarly bonded and fixed to each other via an elastic member such as a silicon adhesive 14, for example.
　さらに、バックフレーム３ｃとアンダーフレーム３ａとは、サイドフレーム３ｂと同様に、嵌合爪などを用いて、簡易的に嵌合される。なお、アンダーフレーム３ａとバックフレーム３ｃとは、上記嵌合爪以外に、例えばネジなどによって組み付ける構成としてもよい。 Further, the back frame 3c and the under frame 3a are simply fitted using fitting claws or the like, similarly to the side frame 3b. The under frame 3a and the back frame 3c may be configured to be assembled with, for example, screws other than the fitting claws.
　以上のように、トップユニット４は構成される。 As described above, the top unit 4 is configured.
　以下に、トッププレート２の形成方法について、説明する。 Hereinafter, a method for forming the top plate 2 will be described.
　まず、ガラスを、トッププレート２に相当する所定の大きさに、切り出す。その後、切り出したガラスの端面部２ａを、研磨して、トッププレート２を形成する。このとき、トッププレート２の端面部２ａは、特に、粒子径の細かい、例えば粒度＃１００～＃２４０以上の研磨微粉を用いて、研磨することが好ましい。これにより、割れの起点となり易い、例えばクラックや凹凸を無くし、トッププレート２の端面部２ａを、きれいな面で仕上げることができる。 First, the glass is cut into a predetermined size corresponding to the top plate 2. Thereafter, the cut end face 2 a of the glass is polished to form the top plate 2. At this time, it is preferable that the end surface portion 2a of the top plate 2 is polished with a fine polishing particle having a small particle diameter, for example, a particle size # 100 to # 240 or more. Thereby, for example, cracks and unevenness that are likely to be the starting point of cracking can be eliminated, and the end surface portion 2a of the top plate 2 can be finished with a clean surface.
　つぎに、端面部２ａを研磨したトッププレート２の上面２ｂ、被加熱物が載置される調理面に、例えばエナメル（琺瑯）などの無機物から構成される塗料でシルク印刷する。 Next, silk printing is performed on the upper surface 2b of the top plate 2 whose end surface 2a has been polished and the cooking surface on which the object to be heated is placed with a paint composed of an inorganic material such as enamel.
　その後、トッププレート２は、後述する、例えば熱などによる強化処理が施される。これにより、トッププレート２の強化およびシルク印刷の焼成が行われる。 Thereafter, the top plate 2 is subjected to a strengthening process by heat, for example, which will be described later. Thereby, reinforcement | strengthening of the top plate 2 and baking of silk printing are performed.
　以上により、所定の強度を有するトッププレート２が形成される。 Thus, the top plate 2 having a predetermined strength is formed.
　［３．トッププレートの表面圧縮応力値と耐熱衝撃性］
　つぎに、本実施の形態における誘導加熱調理器１００のトッププレート２を構成するガラスの表面圧縮応力値と耐熱衝撃性との相関関係について、図３を用いて、説明する。なお、以下では、トッププレート２を構成するガラスとして、ホウケイ酸ガラスを例に、説明する。 [3. Surface plate stress and thermal shock resistance]
Next, the correlation between the surface compressive stress value and the thermal shock resistance of the glass constituting the top plate 2 of the induction heating cooker 100 in the present embodiment will be described with reference to FIG. Hereinafter, borosilicate glass will be described as an example of the glass constituting the top plate 2.
　図３は、ホウケイ酸ガラスの表面圧縮応力値と耐熱衝撃性との相関関係を示す図である。 FIG. 3 is a diagram showing the correlation between the surface compressive stress value and thermal shock resistance of borosilicate glass.
　表面圧縮応力値と耐熱衝撃性との相関関係は、上述したように、従来不明であったが、発明者らの知見に基づいて検討した試験結果から見出したものである。 As described above, the correlation between the surface compressive stress value and the thermal shock resistance has been unknown in the past, but has been found from the test results studied based on the knowledge of the inventors.
　まず、試験方法および試験結果について、具体的に説明する。 First, the test method and test results will be specifically described.
　［３．１　試験方法］
　ガラスとして、上述したように、いわゆるホウケイ酸ガラスと呼ばれる非結晶化ガラスを用いた。ホウケイ酸ガラスは、ＳｉＯ２、Ａｌ２Ｏ３、Ｂ２Ｏ５、およびＮａ２Ｏ３などによって組成され、それらの組成成分率が所定の範囲を有するガラスである。 [3.1 Test method]
As described above, non-crystallized glass called so-called borosilicate glass was used as the glass. Borosilicate glass is a glass that is composed of SiO 2 , Al 2 O 3 , B 2 O 5 , Na 2 O 3 , and the like and has a composition ratio of these components within a predetermined range.
　まず、ホウケイ酸ガラスに対して、熱による、所定の物理強化処理を加えて、試験に使用する試験片を作製した。 First, a predetermined physical strengthening treatment by heat was applied to borosilicate glass to prepare a test piece used for the test.
　つまり、ホウケイ酸ガラスに、所定の熱処理を施して、表面圧縮応力を強化して試験片を作製した。具体的には、ホウケイ酸ガラスを、最大７００℃程度の温度で焼成し、急冷させる処理により、物理強化処理を実施した。 That is, a predetermined heat treatment was performed on the borosilicate glass to strengthen the surface compressive stress, thereby preparing a test piece. Specifically, the physical strengthening treatment was performed by firing the borosilicate glass at a temperature of about 700 ° C. at maximum and quenching it.
　つまり、焼成温度を変えることにより、異なる表面圧縮応力値を有する複数のガラスを準備した。具体的には、ホウケイ酸ガラスの熱強化処理条件として、例えば焼成温度や焼成時間などを変化させて、異なる表面圧縮応力値を有するホウケイ酸ガラスの試験片を作製した。 That is, a plurality of glasses having different surface compressive stress values were prepared by changing the firing temperature. Specifically, borosilicate glass test pieces having different surface compressive stress values were produced by changing, for example, the firing temperature and firing time as the heat strengthening treatment conditions for the borosilicate glass.
　このとき、サイズは２５０ｍｍ角、厚みは約４ｍｍで、試験片のガラスを作製した。また、作製した試験片のガラスの端面は、研磨処理した後の熱処理により、耐熱衝撃性などの特性が強化されている。 At this time, a glass of a test piece having a size of 250 mm square and a thickness of about 4 mm was produced. In addition, the end face of the glass of the produced test piece is enhanced in characteristics such as thermal shock resistance by heat treatment after polishing.
　以下に、耐熱衝撃性の試験方法について、説明する。 The thermal shock resistance test method will be described below.
　まず、上述のようにして作製した、表面圧縮応力値が異なる複数のガラスの試験片を準備する。 First, a plurality of glass test pieces having different surface compressive stress values prepared as described above are prepared.
　つぎに、準備したそれぞれの試験片を、所定温度に維持された恒温槽に入れ、試験片の温度が一定になるまで、恒温槽内に保持する。 Next, each prepared test piece is put in a thermostat maintained at a predetermined temperature, and held in the thermostat until the temperature of the test piece becomes constant.
　つぎに、試験片の温度が一定（所定の温度）になったところで、試験片を恒温槽から取り出す。 Next, when the temperature of the test piece becomes constant (predetermined temperature), the test piece is taken out from the thermostatic bath.
　その後、１５℃の水５００ｍｌを、取り出したそれぞれの試験片の中央に注水する。このとき、試験片の温度は、恒温槽における所定温度から１５℃まで一気に低下する。これにより、試験片に、熱衝撃（温度変化）が加えられる。 Thereafter, 500 ml of water at 15 ° C. is poured into the center of each taken out test piece. At this time, the temperature of a test piece falls at a stretch from the predetermined temperature in a thermostat to 15 degreeC. Thereby, a thermal shock (temperature change) is applied to the test piece.
　つぎに、複数の試験片に対して、同様に、それぞれ熱衝撃を加えて、各試験片が割れを起こす前の最大の熱衝撃（温度変化）を測定した。 Next, a plurality of test pieces were similarly subjected to thermal shock, and the maximum thermal shock (temperature change) before each test piece was cracked was measured.
　そして、測定した結果を、異なる表面圧縮応力値に対する耐熱衝撃性ΔＴ（℃）としてプロットした。これにより、図３に示すような、表面圧縮応力値と耐熱衝撃性との相関関係の結果が得られた。 The measured results were plotted as thermal shock resistance ΔT (° C.) for different surface compressive stress values. As a result, a correlation result between the surface compressive stress value and the thermal shock resistance as shown in FIG. 3 was obtained.
　なお、一般的に、熱強化処理により、一旦、表面圧縮応力が加えられたガラスは、長時間、高温の状態に晒されると、いわゆる応力緩和を起こす。そこで、上記試験においては、一旦、熱強化処理したホウケイ酸ガラスを、意図的に、高温の状態に晒して、応力緩和させている。 In general, glass once subjected to surface compressive stress by heat strengthening treatment is subjected to so-called stress relaxation when exposed to a high temperature state for a long time. Therefore, in the above test, the heat-strengthened borosilicate glass is intentionally exposed to a high temperature state to relieve stress.
　つまり、上記試験は、応力緩和させた後の、ホウケイ酸ガラスの試験片を用いて、上記表面圧縮応力値を測定している。そして、測定された表面圧縮応力値のホウケイ酸ガラスに対する耐熱衝撃性を測定して、図３に示す結果を得ている。 That is, in the above test, the surface compressive stress value is measured using a test piece of borosilicate glass after stress relaxation. And the thermal shock resistance with respect to the borosilicate glass of the measured surface compressive stress value was measured, and the result shown in FIG. 3 is obtained.
　［３．２　試験結果］
　図３に示すように、熱強化処理されたホウケイ酸ガラスの表面圧縮応力値（ＭＰａ）と、耐熱衝撃性ΔＴ（℃）とは、実質的に線形の関係を有することが見出された。 [3.2 Test results]
As shown in FIG. 3, it was found that the surface compressive stress value (MPa) of the heat strengthened borosilicate glass and the thermal shock resistance ΔT (° C.) have a substantially linear relationship.
　つまり、ホウケイ酸ガラスの表面圧縮応力値が大きくなるに従って、耐熱衝撃性が高くなる関係を有する。 That is, the thermal shock resistance increases as the surface compressive stress value of the borosilicate glass increases.
　一般的に、誘導加熱調理器で加熱される被加熱物は、約１４０℃～３００℃の温度範囲で加熱制御される。このとき、被加熱物を２００℃以上の温度で加熱すると、使用者は、高火力で調理している感覚を得やすい。また、炒め物などの場合は、例えば２５０℃～３００℃以上の温度で、使用者は、より高い火力で調理している感覚を得やすい。 Generally, an object to be heated by an induction heating cooker is controlled to be heated in a temperature range of about 140 ° C to 300 ° C. At this time, when the object to be heated is heated at a temperature of 200 ° C. or higher, the user can easily obtain a sense of cooking with high heating power. In the case of fried foods, for example, at a temperature of 250 ° C. to 300 ° C. or higher, the user can easily get a sense of cooking with a higher heating power.
　つまり、使用者は、上記の温度範囲で被加熱物を加熱する傾向が強い。 That is, the user has a strong tendency to heat the object to be heated in the above temperature range.
　そのため、上記の温度範囲での被加熱物の加熱中に、氷水（約０℃）などがトッププレート２にかけられ、熱衝撃が加えられても、トッププレート２には、割れが発生しない耐熱衝撃が必要となる。 Therefore, even when ice water (about 0 ° C.) is applied to the top plate 2 during heating of the object to be heated in the above temperature range and a thermal shock is applied, the top plate 2 does not crack. Is required.
　そこで、本実施の形態では、トッププレート２を、図３に示す耐熱衝撃性と表面圧縮応力値との相関関係に基づいて、少なくとも２０ＭＰａ以上の表面圧縮応力値を有するガラスで構成している。具体的には、ガラスとして、上述した熱強化処理を施したホウケイ酸ガラスを用いて、トッププレート２を構成している。 Therefore, in the present embodiment, the top plate 2 is made of glass having a surface compressive stress value of at least 20 MPa or more based on the correlation between the thermal shock resistance and the surface compressive stress value shown in FIG. Specifically, the top plate 2 is configured using borosilicate glass subjected to the above-described heat strengthening treatment as glass.
　なお、被加熱物が加熱される可能性のある最大の温度を考慮すれば、トッププレート２は、外挿する６０ＭＰａ程度（図示せず）の表面圧縮応力値を有することが好ましい。６０ＭＰａ程度の表面圧縮応力値を有するトッププレート２であれば、誘導加熱調理器１００の使用時における耐熱衝撃性としては十分余裕がある。 In consideration of the maximum temperature at which the object to be heated is likely to be heated, the top plate 2 preferably has a surface compressive stress value of about 60 MPa (not shown) to be extrapolated. If the top plate 2 has a surface compressive stress value of about 60 MPa, the thermal shock resistance when using the induction heating cooker 100 has a sufficient margin.
　また、被加熱物が３００℃までの高温で加熱される可能性がある場合、トッププレート２は、２５ＭＰａより大きい表面圧縮応力値を有することが好ましい。つまり、２５ＭＰａより大きい表面圧縮応力値の場合、図３に示すように、トッププレート２は、３００℃以上の耐熱衝撃性を有する。 In addition, when there is a possibility that the object to be heated is heated at a high temperature up to 300 ° C., the top plate 2 preferably has a surface compressive stress value larger than 25 MPa. That is, in the case of a surface compressive stress value greater than 25 MPa, the top plate 2 has a thermal shock resistance of 300 ° C. or higher as shown in FIG.
　また、トッププレート２の表面圧縮応力値としては、５５ＭＰａ程度であれば、被加熱物が加熱される可能性のある最大の温度（例えば、３００℃）を考慮しても余裕がある。 Further, if the surface compressive stress value of the top plate 2 is about 55 MPa, there is a margin even in consideration of the maximum temperature (for example, 300 ° C.) at which the object to be heated can be heated.
　つまり、本実施の形態のトッププレート２は、加熱温度が、最大３００℃程度の場合、少なくとも２５ＭＰａよりも大きく、５５ＭＰａ以下の表面圧縮応力値を有するガラス（例えば、ホウケイ酸ガラスなど）で構成することが好ましい。 That is, the top plate 2 of the present embodiment is made of glass (for example, borosilicate glass) having a surface compressive stress value of at least greater than 25 MPa and less than 55 MPa when the heating temperature is about 300 ° C. at the maximum. It is preferable.
　［４．誘導加熱調理器の動作、作用］
　以下に、上述のように構成される本実施の形態の誘導加熱調理器１００の動作および作用について、図４Ａから図５Ｂを用いて、説明する。 [4. Operation and action of induction heating cooker]
Below, operation | movement and an effect | action of the induction heating cooking appliance 100 of this Embodiment comprised as mentioned above are demonstrated using FIG. 4A to FIG. 5B.
　図４Ａは、被加熱物１７が加熱される際の様子を前方から見た概略図である。図４Ｂは、被加熱物１７が加熱される際の様子を上方から見た概略図である。図５Ａは、被加熱物１７が加熱された際のトッププレート２の変形の様子を前方から見た概略図である。図５Ｂは、被加熱物１７が加熱された際のトッププレート２の変形の様子を上方から見た概略図である。 FIG. 4A is a schematic view of the heated object 17 as viewed from the front. FIG. 4B is a schematic view of the heated object 17 as viewed from above. FIG. 5A is a schematic view of the deformation of the top plate 2 when the article to be heated 17 is heated as viewed from the front. FIG. 5B is a schematic view of the deformation of the top plate 2 when the article to be heated 17 is heated as viewed from above.
　図４Ａおよび図４Ｂに示すように、被加熱物１７を加熱する際、トッププレート２の調理面（上面２ｂ）に、鍋などの被加熱物１７が載置される。そして、制御部８は、インバータなどを制御して、加熱コイル５（図１参照）に通電する。これにより、加熱コイル５は、被加熱物１７自体に渦電流を発生させて加熱する。その結果、被加熱物１７の温度が上昇する。 4A and 4B, when the object to be heated 17 is heated, the object to be heated 17 such as a pan is placed on the cooking surface (upper surface 2b) of the top plate 2. And the control part 8 controls an inverter etc., and supplies with electricity to the heating coil 5 (refer FIG. 1). Thereby, the heating coil 5 generates an eddy current in the object to be heated 17 and heats it. As a result, the temperature of the article to be heated 17 rises.
　なお、トッププレート２を構成するホウケイ酸ガラスの熱膨張係数は、比較的小さいが、ゼロではない。つまり、トッププレート２は、結晶化ガラスと異なり、加熱により、熱膨張する。 Note that the thermal expansion coefficient of the borosilicate glass constituting the top plate 2 is relatively small but not zero. That is, unlike the crystallized glass, the top plate 2 is thermally expanded by heating.
　このとき、被加熱物１７が加熱されると、トッププレート２は、部分的に加熱される。そのため、主に加熱された部分のトッププレート２が、図５Ａに示すように、上方に持ち上がるように変形する。これにより、トッププレート２には、引張応力１８が発生する。そして、トッププレート２の端面部２ａにも、図５Ｂに示すように、引張応力１８が加えられることになる。 At this time, when the article to be heated 17 is heated, the top plate 2 is partially heated. Therefore, the top plate 2 of the heated portion is deformed so as to be lifted upward as shown in FIG. 5A. As a result, a tensile stress 18 is generated in the top plate 2. And the tensile stress 18 is applied also to the end surface part 2a of the top plate 2 as shown in FIG. 5B.
　このとき、トッププレート２の端面部２ａには、通常、クラック１９または鋭利なエッジ部２０などの凹凸がある。そのため、端面部２ａに引張応力１８が加えられると、クラック１９またはエッジ部２０を起点として、トッププレート２が割れる虞がある。 At this time, the end surface portion 2a of the top plate 2 usually has irregularities such as a crack 19 or a sharp edge portion 20. Therefore, when the tensile stress 18 is applied to the end surface portion 2a, the top plate 2 may be cracked starting from the crack 19 or the edge portion 20.
　そこで、本実施の形態のトッププレート２は、端面部２ａを、粒子径の細かい研磨微粉で研磨処理している。これにより、トッププレート２の端面部２ａには、クラックまたは鋭利なエッジ部の形成が抑制される。その結果、引張応力１８による端面部２ａのクラックなどを起点とする、トッププレート２の割れの発生の可能性を低減できる。 Therefore, in the top plate 2 of the present embodiment, the end surface portion 2a is polished with a fine polishing powder having a small particle diameter. Thereby, the formation of cracks or sharp edge portions on the end surface portion 2a of the top plate 2 is suppressed. As a result, the possibility of occurrence of cracks in the top plate 2 starting from cracks in the end face portion 2a due to the tensile stress 18 can be reduced.
　また、本実施の形態のトッププレート２は、２０ＭＰａ～６０ＭＰａ、好ましくは２５ＭＰａ～５５ＭＰａの表面圧縮応力値を有する、熱強化処理されたホウケイ酸ガラスで構成される。つまり、トッププレート２は、通常のホウケイ酸ガラスよりも、強度が増加されたホウケイ酸ガラスで構成される。 Further, the top plate 2 of the present embodiment is made of a heat strengthened borosilicate glass having a surface compressive stress value of 20 MPa to 60 MPa, preferably 25 MPa to 55 MPa. That is, the top plate 2 is composed of borosilicate glass having an increased strength compared to normal borosilicate glass.
　そのため、本実施の形態のトッププレート２は、通常のホウケイ酸ガラスと比較して、引張応力１８に対して強い。これにより、トッププレート２に引張応力１８が加えられても、割れが発生しにくい。 Therefore, the top plate 2 of the present embodiment is stronger against the tensile stress 18 than the normal borosilicate glass. Thereby, even if the tensile stress 18 is applied to the top plate 2, it is hard to generate | occur | produce a crack.
　さらに、トッププレート２の熱変形量は、被加熱物１７の温度が上昇すればするほど、大きくなる。そのため、端面部２ａに発生する引張応力１８も大きくなる。しかし、本実施の形態のトッププレート２は、２５ＭＰａ～５５ＭＰａの表面圧縮応力値を有する。そのため、トッププレート２は、３００℃程度の加熱で発生する引張応力１８に対しても、充分な耐性を備える。 Furthermore, the amount of thermal deformation of the top plate 2 increases as the temperature of the object to be heated 17 increases. Therefore, the tensile stress 18 generated in the end surface portion 2a also increases. However, the top plate 2 of the present embodiment has a surface compressive stress value of 25 MPa to 55 MPa. Therefore, the top plate 2 has sufficient resistance against the tensile stress 18 generated by heating at about 300 ° C.
　また、本実施の形態の誘導加熱調理器１００は、赤外線センサで構成された温度検知部６で、常に被加熱物１７の温度を検知しながら、加熱を制御する。赤外線センサは、被加熱物１７から出される赤外線を検知して、被加熱物１７の温度を検出する。そのため、伝導熱により温度を検知するサーミスタに比べて、温度の検知精度が高く、かつ、検知速度も速い。 Further, the induction heating cooker 100 according to the present embodiment controls heating while constantly detecting the temperature of the object to be heated 17 by the temperature detection unit 6 configured by an infrared sensor. The infrared sensor detects the infrared ray emitted from the heated object 17 and detects the temperature of the heated object 17. Therefore, the temperature detection accuracy is high and the detection speed is also faster than the thermistor that detects the temperature by conduction heat.
　つまり、赤外線センサは、例えば被加熱物１７が空焼きされるなどして高温になった場合、すばやく検知する。そのため、制御部８は、温度検知部６の検知結果に基づいて、被加熱物１７に対する加熱の停止などを、すばやく制御できる。これにより、被加熱物１７からの伝熱によるトッププレート２の温度の急上昇を、未然に防止できる。つまり、迅速な温度検知により、トッププレート２が大きく熱変形することを抑制できる。 That is, the infrared sensor quickly detects when the object to be heated 17 is heated to a high temperature, for example. Therefore, the control unit 8 can quickly control the heating stop of the article to be heated 17 based on the detection result of the temperature detection unit 6. Thereby, the rapid rise in the temperature of the top plate 2 due to heat transfer from the object to be heated 17 can be prevented in advance. That is, it is possible to prevent the top plate 2 from being greatly deformed by rapid temperature detection.
　また、制御部８は、被加熱物１７の温度が、端面部２ａに割れが発生するような引張応力１８が発生する温度域にならないように、加熱コイル５を制御することができる。 Further, the control unit 8 can control the heating coil 5 so that the temperature of the object to be heated 17 does not fall within a temperature range in which a tensile stress 18 that causes a crack in the end surface portion 2a is generated.
　また、本実施の形態のトッププレート２は、端面部２ａに研磨処理が施された後、さらに熱強化処理を加えている。そのため、研磨処理を施した部分も、他の部分と同様に、熱強化される。これにより、本実施の形態のトッププレート２は、端面部２ａを熱強化処理していないトッププレートと比較して、引張応力１８に対する強度を高くできる。 Further, the top plate 2 of the present embodiment is further subjected to a heat strengthening process after the end face part 2a is subjected to the polishing process. Therefore, the portion subjected to the polishing treatment is thermally strengthened in the same manner as the other portions. Thereby, the top plate 2 of this Embodiment can make the intensity | strength with respect to the tensile stress 18 high compared with the top plate which does not heat-treat the end surface part 2a.
　さらに、本実施の形態のトッププレート２は、引張応力１８に対する強度が高いため、高い温度領域（例えば、２５０℃～３００℃以上）まで、被加熱物１７の温度を上げて加熱調理できる。これにより、使用者は、被加熱物１７を高火力で調理しているという実感を容易に得ることができる。 Furthermore, since the top plate 2 of the present embodiment has a high strength against the tensile stress 18, the top plate 2 can be cooked by raising the temperature of the article to be heated 17 to a high temperature range (eg, 250 ° C. to 300 ° C. or higher). Thereby, the user can easily obtain a real feeling that the object to be heated 17 is cooked with high heating power.
　なお、トッププレートは、上述したように、高い温度領域での被加熱物１７の加熱において、氷水（約０℃）がトッププレート２の調理面にかけられた場合、例えば２５０℃～３００℃という大きな熱衝撃が加えられる可能性がある。 As described above, the top plate has a large temperature of, for example, 250 ° C. to 300 ° C. when ice water (about 0 ° C.) is applied to the cooking surface of the top plate 2 in heating the object to be heated 17 in a high temperature range. Thermal shock may be applied.
　そこで、本実施の形態のトッププレート２は、２０ＭＰａ～６０ＭＰａ、好ましくは２５ＭＰａ～５５ＭＰａの表面圧縮応力を有するように構成している。そのため、トッププレート２は、２００℃～３００℃以上の耐熱衝撃性を備える。これにより、トッププレート２は、使用者によって加えられる可能性のある熱衝撃性に、充分、耐えることができる。 Therefore, the top plate 2 of the present embodiment is configured to have a surface compressive stress of 20 MPa to 60 MPa, preferably 25 MPa to 55 MPa. Therefore, the top plate 2 has a thermal shock resistance of 200 ° C. to 300 ° C. or more. Thereby, the top plate 2 can sufficiently withstand the thermal shock that may be applied by the user.
　また、本実施の形態のトッププレート２は、上面２ｂの調理面に、無機物で構成され、高温においても耐え得る塗料がシルク印刷により印刷される。これにより、被加熱物１７の載置時などのトッププレート２の調理面の傷の防止や、被加熱物１７の滑りを、未然に防止できる。 Also, the top plate 2 of the present embodiment is made of an inorganic material on the cooking surface of the upper surface 2b, and a paint that can withstand high temperatures is printed by silk printing. Thereby, it is possible to prevent the cooking surface of the top plate 2 from being scratched and the sliding of the heated object 17 before the heated object 17 is placed.
　以上のように、本実施の形態の誘導加熱調理器１００は、動作および作用する。 As described above, the induction heating cooker 100 of the present embodiment operates and acts.
　以下に、誘導加熱調理器１００のフレーム３によるトッププレート２の支持構成について、図６Ａおよび図６Ｂを用いて、説明する。 Hereinafter, the support structure of the top plate 2 by the frame 3 of the induction heating cooker 100 will be described with reference to FIGS. 6A and 6B.
　図６Ａは、本実施の形態におけるトッププレート２を支持するフレーム３の概略構成の一例を示す断面図である。図６Ｂは、フレームの概略構成の比較例を示す断面図である。 FIG. 6A is a cross-sectional view showing an example of a schematic configuration of the frame 3 that supports the top plate 2 in the present embodiment. FIG. 6B is a cross-sectional view illustrating a comparative example of a schematic configuration of a frame.
　本実施の形態のトッププレート２の端面部２ａは、図６Ａに示すように、サイドフレーム３ｂが囲むように配置される。このとき、サイドフレーム３ｂは、トッププレート２の上方の位置には存在しない、つまり、トッププレート２の上面２ｂは覆わないように配設される。 The end surface portion 2a of the top plate 2 of the present embodiment is disposed so as to surround the side frame 3b as shown in FIG. 6A. At this time, the side frame 3b does not exist at a position above the top plate 2, that is, the upper surface 2b of the top plate 2 is not covered.
　一方、図６Ｂの比較例に示すトッププレート２の場合、サイドフレーム３ｂの上方側の端部が内側（トッププレート側）に折り曲げられ、トッププレート２の端面部２ａを包み込むように配設される。この場合、トッププレート２が加熱され、熱変形すると、トッププレート２の上面２ｂとサイドフレーム３ｂの端部とが接触部２１を介して接触する。これにより、接触部２１に応力集中が起きる。そのため、接触部２１を起点にトッププレート２が割れる虞がある。 On the other hand, in the case of the top plate 2 shown in the comparative example of FIG. 6B, the upper end portion of the side frame 3b is bent inward (top plate side) and is disposed so as to wrap around the end surface portion 2a of the top plate 2. . In this case, when the top plate 2 is heated and thermally deformed, the upper surface 2b of the top plate 2 and the end of the side frame 3b come into contact with each other through the contact portion 21. Thereby, stress concentration occurs in the contact portion 21. Therefore, there is a possibility that the top plate 2 may break from the contact portion 21 as a starting point.
　しかし、本実施の形態のトッププレート２は、図６Ａに示すように、サイドフレーム３ｂがトッププレート２を包み込まないように構成している。つまり、サイドフレーム３ｂは、トッププレート２の上面２ｂの上方の位置には配置されように構成される。 However, the top plate 2 of the present embodiment is configured such that the side frame 3b does not wrap the top plate 2 as shown in FIG. 6A. That is, the side frame 3 b is configured to be disposed at a position above the upper surface 2 b of the top plate 2.
　そのため、図６Ｂに示すように、接触部２１を介して、トッププレート２の上面２ｂと、サイドフレーム３ｂとは、接触しない。つまり、接触部２１における応力集中が、トッププレート２の上面２ｂ上で発生しない。これにより、トッププレート２が割れる可能性が低減される。 Therefore, as shown in FIG. 6B, the upper surface 2b of the top plate 2 and the side frame 3b are not in contact with each other via the contact portion 21. That is, stress concentration at the contact portion 21 does not occur on the upper surface 2 b of the top plate 2. Thereby, possibility that the top plate 2 will crack is reduced.
　また、本実施の形態のトッププレート２は、透明性の高い非結晶化ガラスであるホウケイ酸ガラスで構成される。そのため、トッププレート２上に印刷される、例えば白色などの色をきれいに表現できる。これにより、トッププレート２のデザイン性を、より高めることができる。 Further, the top plate 2 of the present embodiment is composed of borosilicate glass that is highly transparent non-crystallized glass. Therefore, a color such as white printed on the top plate 2 can be clearly expressed. Thereby, the design property of the top plate 2 can be improved more.
　また、トッププレート２を非結晶化ガラスで構成することにより、安価な誘導加熱調理器１００を実現できる。 Further, by constructing the top plate 2 with non-crystallized glass, an inexpensive induction heating cooker 100 can be realized.
　以上のように、本実施の形態の誘導加熱調理器１００は、高い火力での加熱調理においても、トッププレート２の割れを、効果的に低減できる。 As described above, the induction heating cooker 100 according to the present embodiment can effectively reduce cracks in the top plate 2 even in cooking with high thermal power.
　さらに、使用者が、高い火力で加熱処理しているとの満足感を実感できる誘導加熱調理器が得られる。 Furthermore, an induction heating cooker can be obtained in which the user can feel satisfied that the heat treatment is performed with high heat.
　［５．トップユニットの構成例］
　以下に、トップユニット４の構成例について、図７Ａおよび図７Ｂを用いて、説明する。 [5. Top unit configuration example]
Below, the structural example of the top unit 4 is demonstrated using FIG. 7A and FIG. 7B.
　図７Ａは、本実施の形態における誘導加熱調理器１００のトップユニット４の平面図である。図７Ｂは、図７Ａのトップユニット４を７Ｂ－７Ｂ線で切断した断面図である。 FIG. 7A is a plan view of the top unit 4 of the induction heating cooker 100 in the present embodiment. FIG. 7B is a cross-sectional view of the top unit 4 of FIG. 7A taken along line 7B-7B.
　図７Ａに示すように、底面部を構成するアンダーフレーム３ａは、トッププレート２の平面視において、トッププレート２の外周から加熱コイル５（図１参照）に対応する加熱エリア２２の周囲近傍まで延在するように形成される。つまり、アンダーフレーム３ａは、少なくとも３つの加熱コイル５を内包する開口３ａ１を有する。これにより、加熱コイル５の上方を除いて、アンダーフレーム３ａが配設される。 As shown in FIG. 7A, the underframe 3a constituting the bottom surface portion extends from the outer periphery of the top plate 2 to the vicinity of the periphery of the heating area 22 corresponding to the heating coil 5 (see FIG. 1) in the plan view of the top plate 2. Formed to exist. That is, the under frame 3a has an opening 3a1 that encloses at least three heating coils 5. Thereby, except for the upper part of the heating coil 5, the under frame 3a is arrange | positioned.
　トッププレート２とアンダーフレーム３ａの開口３ａ１の内周近傍との間には、図７Ｂに示すように、例えばシリコン接着剤１４などの弾性部材が配設される。弾性部材は、トッププレート２の平面視において、加熱コイル５の周囲を囲むように配置される。そして、弾性部材は、トッププレート２をアンダーフレーム３ａに接着させて、固定する。 As shown in FIG. 7B, an elastic member such as a silicon adhesive 14 is disposed between the top plate 2 and the vicinity of the inner periphery of the opening 3a1 of the under frame 3a. The elastic member is disposed so as to surround the heating coil 5 in a plan view of the top plate 2. The elastic member fixes the top plate 2 by adhering it to the under frame 3a.
　上述のように、トップユニット４は構成される。 The top unit 4 is configured as described above.
　上記構成において、トッププレート２の上面２ｂ上の被加熱物１７の温度が上昇すると、トッププレート２の温度も上昇する。そのため、トッププレート２を構成するホウケイ酸ガラスが膨張し、トッププレート２に引張応力１８が発生する（図５Ａ参照）。このとき、引張応力１８は、トッププレート２の端面部２ａに集中する（図５Ｂ参照）。 In the above configuration, when the temperature of the heated object 17 on the upper surface 2b of the top plate 2 rises, the temperature of the top plate 2 also rises. Therefore, the borosilicate glass constituting the top plate 2 expands, and a tensile stress 18 is generated in the top plate 2 (see FIG. 5A). At this time, the tensile stress 18 is concentrated on the end surface portion 2a of the top plate 2 (see FIG. 5B).
　そこで、本実施の形態のトッププレート２は、加熱エリア２２の周囲を囲む位置を、シリコン接着剤１４を介して、アンダーフレーム３ａに接着、固定される。つまり、トッププレート２は、加熱エリア２２の周囲を囲む位置において、アンダーフレーム３ａに拘束される。 Therefore, the top plate 2 according to the present embodiment is bonded and fixed to the under frame 3a through the silicon adhesive 14 at a position surrounding the periphery of the heating area 22. That is, the top plate 2 is restrained by the under frame 3 a at a position surrounding the periphery of the heating area 22.
　そのため、図７Ｂに示すように、トッププレート２に加わる引張応力１８に対する反力２３が、加熱エリア２２の周囲に発生する。 Therefore, as shown in FIG. 7B, a reaction force 23 against the tensile stress 18 applied to the top plate 2 is generated around the heating area 22.
　これにより、トッププレート２の端面部２ａ以外の部分にも、引張応力１８が分散される。その結果、トッププレート２の端面部２ａへの引張応力１８の集中が抑制され、トッププレート２の割れが防止される。 Thereby, the tensile stress 18 is also distributed to portions other than the end surface portion 2a of the top plate 2. As a result, concentration of the tensile stress 18 on the end surface portion 2a of the top plate 2 is suppressed, and cracking of the top plate 2 is prevented.
　また、トッププレート２は、加熱エリア２２の周囲を囲む位置において、アンダーフレーム３ａに拘束される。そのため、トッププレート２の熱変形が低減される。 Further, the top plate 2 is restrained by the under frame 3a at a position surrounding the periphery of the heating area 22. Therefore, the thermal deformation of the top plate 2 is reduced.
　以上のように、本実施の形態のトップユニット４の構成によれば、トッププレート２の熱変形を低減できる。さらに、トッププレート２の端面部２ａへの引張応力１８の集中を抑制できる。これにより、トッププレート２が割れを、さらに効果的に抑制できる。 As described above, according to the configuration of the top unit 4 of the present embodiment, the thermal deformation of the top plate 2 can be reduced. Furthermore, the concentration of the tensile stress 18 on the end surface portion 2a of the top plate 2 can be suppressed. Thereby, the top plate 2 can suppress a crack more effectively.
　なお、上述のトップユニット４の構成は、熱膨張するガラスであれば、何れにおいても有用である。そのため、上述したホウケイ酸ガラス以外のガラスにも適用可能である。 The configuration of the top unit 4 described above is useful for any glass that is thermally expanded. Therefore, it is applicable also to glass other than the borosilicate glass mentioned above.
　［６．誘導加熱調理器の製造方法］
　以下に、本実施の形態の誘導加熱調理器の製造方法について、図８を用いて、説明する。 [6. Induction heating cooker manufacturing method]
Below, the manufacturing method of the induction heating cooking appliance of this Embodiment is demonstrated using FIG.
　図８は、本実施の形態の誘導加熱調理器１００の製造方法を示すフローチャートである。 FIG. 8 is a flowchart showing a method for manufacturing induction heating cooker 100 of the present embodiment.
　なお、本実施の形態の誘導加熱調理器１００のトッププレート２は、上述した熱によって物理強化されたホウケイ酸ガラスで構成される。 In addition, the top plate 2 of the induction heating cooker 100 of this Embodiment is comprised with the borosilicate glass physically strengthened by the heat mentioned above.
　まず、本実施の形態の誘導加熱調理器１００は、筐体１の内部に、図１に示す被加熱物１７を加熱する加熱部である加熱コイル５および加熱コイル５を制御する制御部８が配置される（ステップＳ０１）。 First, in induction heating cooker 100 of the present embodiment, heating coil 5 that is a heating unit that heats object to be heated 17 shown in FIG. 1 and control unit 8 that controls heating coil 5 are provided inside casing 1. Arranged (step S01).
　なお、加熱コイル５および制御部８は、筐体１の内部に積み上げて配置する積み上げ方式で配置してもよい。また、トップユニット４として一体化された状態で、加熱コイル５および制御部８を筐体１に配置してもよい。 In addition, you may arrange | position the heating coil 5 and the control part 8 by the pile-up system which piles up and arrange | positions inside the housing | casing 1. FIG. Further, the heating coil 5 and the control unit 8 may be arranged in the housing 1 in a state integrated as the top unit 4.
　つぎに、トッププレート２を構成する、例えばホウケイ酸ガラスの耐熱衝撃性と表面圧縮応力値との相関関係を算出する（ステップＳ０２）。これにより、図３に示す、ホウケイ酸ガラスの耐熱衝撃性と表面圧縮応力値との相関関係が得られる。なお、予め相関関係が算出されている場合、上記ステップＳ０２を省略することが可能である。 Next, a correlation between the thermal shock resistance of the top plate 2, for example, borosilicate glass and the surface compressive stress value is calculated (step S02). Thereby, the correlation between the thermal shock resistance of borosilicate glass and the surface compressive stress value shown in FIG. 3 is obtained. If the correlation is calculated in advance, step S02 can be omitted.
　つぎに、上述の耐熱衝撃性と表面圧縮応力値との相関関係に基づいて、誘導加熱調理器１００において必要とされる耐熱衝撃性に対応する目標表面圧縮応力値を特定する。 Next, based on the correlation between the thermal shock resistance and the surface compressive stress value, the target surface compressive stress value corresponding to the thermal shock resistance required in the induction heating cooker 100 is specified.
　そして、特定した目標表面圧縮応力値を有するホウケイ酸ガラスでトッププレート２を形成し、筐体１に組み込む（ステップＳ０３）。なお、本実施の形態のトッププレート２は、例えば３００℃以上の耐熱衝撃性が必要とされる。そのため、目標表面圧縮応力値としては、２５ＭＰａよりも大きいトッププレート２を特定する。 Then, the top plate 2 is formed from borosilicate glass having the specified target surface compressive stress value, and incorporated in the housing 1 (step S03). Note that the top plate 2 of the present embodiment is required to have a thermal shock resistance of, for example, 300 ° C. or higher. Therefore, the top plate 2 larger than 25 MPa is specified as the target surface compressive stress value.
　つぎに、筐体１に組み込まれたトッププレート２が、所望の目標表面圧縮応力値を有するか否を検査して判定する（ステップＳ０４）。なお、トッププレート２の検査は、はじめに、例えばトッププレート２上の複数箇所の表面圧縮応力値を、測定機器で測定する。そして、複数箇所の全てにおいて、目標表面圧縮応力値以上かどうか確認することにより行われる。 Next, it is determined by inspecting whether the top plate 2 incorporated in the housing 1 has a desired target surface compressive stress value (step S04). In the inspection of the top plate 2, first, for example, surface compressive stress values at a plurality of locations on the top plate 2 are measured with a measuring device. And it is performed by confirming whether it is more than a target surface compressive stress value in all the some places.
　このとき、トッププレート２が、所望の目標表面圧縮応力値を有する場合（ステップＳ０４のＹ）、誘導加熱調理器１００の製造を終了する。 At this time, when the top plate 2 has a desired target surface compressive stress value (Y in step S04), the production of the induction heating cooker 100 is finished.
　一方、トッププレート２が、所望の目標表面圧縮応力値を有さない、すなわち、検査をクリアできない場合（ステップＳ０４のＮ）、目標表面圧縮応力値を有する別のトッププレート２と取替えて、ステップＳ０３以降のステップを実行する。 On the other hand, if the top plate 2 does not have the desired target surface compressive stress value, that is, if the inspection cannot be cleared (N in step S04), the top plate 2 is replaced with another top plate 2 having the target surface compressive stress value. Steps after S03 are executed.
　以上のように、誘導加熱調理器１００が製造される。これにより、トッププレート２の割れが発生しにくく、高いデザイン性を備える誘導加熱調理器１００を作製できる。 As described above, the induction heating cooker 100 is manufactured. Thereby, the crack of the top plate 2 is hard to generate | occur | produce and the induction heating cooking appliance 100 provided with high design property can be produced.
　本開示の誘導加熱調理器は、高温の温度域で被加熱物を加熱しても、トッププレートの割れを低減できる。そのため、キッチンに組み込む誘導加熱調理器に限らず、テーブル上に据え置くタイプの誘導加熱調理器に対しても有用である。 The induction cooking device of the present disclosure can reduce cracks in the top plate even when the object to be heated is heated in a high temperature range. Therefore, it is useful not only for the induction heating cooker incorporated in the kitchen, but also for an induction heating cooker of the type installed on a table.
　１　　筐体
　２　　トッププレート
　２ａ　　端面部
　２ｂ　　上面
　３　　フレーム
　３ａ　　アンダーフレーム（底面部）
　３ａ１，１２ａ　　開口
　３ｂ　　サイドフレーム（周囲部）
　３ｃ　　バックフレーム
　４　　トップユニット
　５　　加熱コイル
　６　　温度検知部
　７　　操作ユニット
　８　　制御部
　９　　冷却ファン
　１０　　キッチンキャビネット
　１０ａ　　開口部
　１１　　吸気穴
　１２　　グリル調理庫
　１３　　グリルドア
　１４　　シリコン接着剤（弾性部材）
　１５　　排気口
　１６　　バックグリル
　１７　　被加熱物
　１８　　引張応力
　１９　　クラック
　２０　　エッジ部
　２１　　接触部
　２２　　加熱エリア
　２３　　反力
　１００　　誘導加熱調理器 DESCRIPTION OF SYMBOLS 1 Housing | casing 2 Top plate 2a End surface part 2b Upper surface 3 Frame 3a Under frame (bottom part)
3a1, 12a Opening 3b Side frame (peripheral part)
3c Back frame 4 Top unit 5 Heating coil 6 Temperature detection part 7 Operation unit 8 Control part 9 Cooling fan 10 Kitchen cabinet 10a Opening part 11 Intake hole 12 Grill cooking chamber 13 Grill door 14 Silicone adhesive (elastic member)
DESCRIPTION OF SYMBOLS 15 Exhaust port 16 Back grill 17 To-be-heated object 18 Tensile stress 19 Crack 20 Edge part 21 Contact part 22 Heating area 23 Reaction force 100 Induction heating cooker

Claims (9)

  1. 筐体と、
    前記筐体の上部に配置され、被加熱物が載置されるトッププレートと、
    前記トッププレートを保持するフレームと、
    前記筐体の内部に配置され、前記被加熱物を加熱する加熱部および前記加熱部を制御する制御部と、を備え、
    前記トッププレートは、表面圧縮応力値が２５ＭＰａよりも大きいガラスで構成される、
    誘導加熱調理器。     A housing,
    A top plate disposed at the top of the housing and on which an object to be heated is placed;
    A frame for holding the top plate;
    A heating unit that is disposed inside the casing and that heats the object to be heated and a control unit that controls the heating unit;
    The top plate is made of glass having a surface compressive stress value larger than 25 MPa,
    Induction heating cooker.
  2. 前記トッププレートを構成する前記ガラスは、ホウケイ酸ガラスである請求項１に記載の誘導加熱調理器。 The induction heating cooker according to claim 1, wherein the glass constituting the top plate is borosilicate glass.
  3. 前記トッププレートを構成する前記ガラスは、熱によって物理強化される、
    請求項１に記載の誘導加熱調理器。     The glass constituting the top plate is physically strengthened by heat.
    The induction heating cooker according to claim 1.
  4. 前記トッププレートを構成する前記ガラスは、３００℃以上の耐熱衝撃性を有する、
    請求項１に記載の誘導加熱調理器。     The glass constituting the top plate has a thermal shock resistance of 300 ° C. or higher.
    The induction heating cooker according to claim 1.
  5. 前記トッププレートを構成する前記ガラスは、５５ＭＰａ以下の表面圧縮応力値を有する、
    請求項１に記載の誘導加熱調理器。     The glass constituting the top plate has a surface compressive stress value of 55 MPa or less,
    The induction heating cooker according to claim 1.
  6. 前記フレームは、前記トッププレートの平面視において、前記トッププレートの端面部を囲むように、前記トッププレートの外周に沿って配置される周囲部を、有し、
    前記周囲部は、前記トッププレートの上面の位置に配置しない、
    請求項１に記載の誘導加熱調理器。     The frame has a peripheral portion arranged along an outer periphery of the top plate so as to surround an end surface portion of the top plate in a plan view of the top plate;
    The peripheral portion is not arranged at the position of the upper surface of the top plate.
    The induction heating cooker according to claim 1.
  7. 前記フレームは、前記トッププレートの下方に位置する底面部を有し、
    前記トッププレートと前記底面部との間には、前記トッププレートを前記底面部に接着させる弾性部材が設けられ、
    前記弾性部材は、前記トッププレートの平面視において、前記加熱部の周囲を囲むように配置される、
    請求項１に記載の誘導加熱調理器。     The frame has a bottom surface located below the top plate;
    Between the top plate and the bottom surface portion, an elastic member for bonding the top plate to the bottom surface portion is provided,
    The elastic member is arranged so as to surround the periphery of the heating unit in a plan view of the top plate.
    The induction heating cooker according to claim 1.
  8. 熱によって物理強化されたガラスから構成されるトッププレートを用いた誘導加熱調理器の製造方法であって、
    筐体の内部に、被加熱物を加熱する加熱部および前記加熱部を制御する制御部を配置するステップと、
    前記ガラスにおける耐熱衝撃性と表面圧縮応力値との相関関係に基づいて、前記誘導加熱調理器において必要とされる前記耐熱衝撃性に対応する目標表面圧縮応力値を特定し、特定した前記目標表面圧縮応力値を有する前記トッププレートを、前記筐体に組み込むステップと、を含む、
    誘導加熱調理器の製造方法。     A method of manufacturing an induction heating cooker using a top plate composed of glass physically strengthened by heat,
    Arranging a heating unit for heating an object to be heated and a control unit for controlling the heating unit inside the housing;
    Based on the correlation between the thermal shock resistance and the surface compressive stress value in the glass, the target surface compressive stress value corresponding to the thermal shock resistance required in the induction heating cooker is specified, and the specified target surface is specified Incorporating the top plate having a compressive stress value into the housing;
    A method for manufacturing an induction heating cooker.
  9. 前記相関関係を算出するステップを、さらに含む、
    請求項８に記載の誘導加熱調理器の製造方法。     Further comprising calculating the correlation.
    The manufacturing method of the induction heating cooking appliance of Claim 8.
PCT/JP2017/027205 2017-03-30 2017-07-27 Induction-heating cooker and induction-heating cooker production method WO2018179473A1 (en)

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