WO2018179473A1 - 誘導加熱調理器および誘導加熱調理器の製造方法 - Google Patents

誘導加熱調理器および誘導加熱調理器の製造方法 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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WIPO (PCT)
Prior art keywords
top plate
induction heating
heating cooker
heated
glass
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PCT/JP2017/027205
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English (en)
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/zh
Publication of WO2018179473A1 publication Critical patent/WO2018179473A1/ja

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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)
PCT/JP2017/027205 2017-03-30 2017-07-27 誘導加熱調理器および誘導加熱調理器の製造方法 WO2018179473A1 (ja)

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