JP2005276584A - Top plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the external appearance of a top plate from looking poor. <P>SOLUTION: A heat resistant layer 412 coated with inorganic paint is provided on the back side of a top plate body 41 formed of crystallized glass, and a protective layer 413 coated with organic paint is provided on the heat resistant layer 412. Thereby, transmission of built-in components are prevented by heightening covering power. In addition, the protective layer 413 is coated with the organic paint except for a portion corresponding to an electromagnetic induction heater 321, and thereby even when a metallic pan 7 on the top plate 40 is abnormally heated, there is no chance that the temperature of the organic paint forming the protective layer 413 exceeds the limit of its heat resistant temperature and discolors. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cooking device installed in a system kitchen, and more particularly to a top plate that is mounted on a heater body that incorporates an electromagnetic induction heater.

  In recent years, system kitchens with an emphasis on external appearance have been gaining popularity in the kitchens of ordinary households. In such system kitchens, cooking devices that use electricity as a heat source are frequently used in consideration of safety and design. This type of cooking device incorporates, for example, an electromagnetic induction heating heater or a radiant heater, and a top plate is mounted on the upper surface of these heaters. In general, the top plate is coated with an inorganic paint on the back side of the top plate made of transparent crystallized glass so that the built-in components including the heater cannot be seen through. The top is coated with an organic paint and colored. Conventionally, those using dark color paints have been the mainstream, but recently, there have been an increase in the use of white or light color paints to give the top plate a bright color tone.

  In such a heating cooker, unlike the radiant heater, the electromagnetic induction heating type heater does not generate heat, but heats the metal pan placed on the top plate for cooking. This electromagnetic induction heater has a temperature sensor in the center that detects the temperature of the pan. The temperature detected by this sensor is displayed in a light-emitting manner, and the coating of the top plate is removed by removing the paint coating only at the corresponding location. The temperature display is visible from above. Further, the temperature sensor has a function of preventing abnormal heating such as emptying of a pan (see, for example, Patent Document 1).

JP 2003-297540 A

  As is the case with the heating cooker disclosed in Patent Document 1, a temperature sensor installed in the heater is widely used as a contact type that utilizes the characteristics of a thermistor whose resistance varies with temperature. This sensor includes a thermal element in which the periphery of a thermistor connected to a lead wire is covered with silicone grease as a thermal diffusing agent, and the thermal element is biased against the back surface of the top plate by a spring. Then, the heat of the pan on the top plate is transmitted to the thermosensitive element brought into pressure contact with the top plate, and the temperature is detected by the thermistor.

  According to such a contact-type temperature sensor, when the pan placed on the electromagnetic induction heater has a flat bottom surface, there is no gap between the metal pan bottom and the glass top plate. Since it is in contact over a wide area, the heat of the pan is quickly conducted to the top plate and transferred to the thermosensitive element, so accurate temperature detection can be expected. Usually, the pan at this time is controlled in a normal temperature range of about 150 to 200 ° C. In addition, even if the pan is boiled, the temperature of the glass surface is controlled not to exceed 210 ° C. by the function of the sensor.

  However, when the pan placed on the electromagnetic induction heating heater is, for example, a raised bottom or a deformed pan, a gap is formed between the pan bottom and the top plate, and the air accumulated in this gap becomes a heat insulating layer. It becomes difficult for the heat of the pan to be transmitted to the top plate. Therefore, the heat conduction from the top plate to the thermal element becomes dull, and as a result, the temperature detection of the temperature sensor is delayed and the pan heats up abnormally. It can be very hot.

  If the pan heats up abnormally in this way, the heater-compatible part of the top plate on which the pan is placed will also be at a high temperature. Discoloration beyond the limits of. Moreover, once the organic paint has changed color, it will not return to its original state even if the top plate is cooled. Therefore, in the case of a top plate colored with a white or light-colored paint on the back side of the top plate, the discolored organic paint color is visible through the top plate surface and the appearance of the top plate is degraded. It was a factor inviting.

  The present invention has been made in view of such circumstances, and the problem to be solved is that when an abnormal heat generation occurs in a metal pan placed on an electromagnetic induction heating type heater, This is to prevent the appearance of the top plate from being deteriorated by eliminating the discoloration of the coated paint.

  In order to solve such problems, the present invention is a top plate mounted on a heater body incorporating an electromagnetic induction heating heater, and an inorganic paint is coated on the back surface of a top plate made of crystallized glass. Another object of the present invention is to provide a top plate in which a heat-resistant layer is provided, and a protective layer coated with an organic paint is provided on the heat-resistant layer except for a corresponding portion of an electromagnetic induction heater. In the present invention, coating means that the paint is baked and cured at a predetermined temperature after printing. Inorganic coatings can be used, which are pastes made by kneading an inorganic pigment containing titanium oxide as a main component and glass frit containing boron oxide or barium oxide in a solvent. Organic coatings include titanium oxide and carbon. A paste prepared by kneading an inorganic pigment mixed with black and an organic silicone resin in an organic solvent containing xylene, ethylbenzene, or high-boiling aromatic naphtha can be used.

  As already described, when cooking is performed by placing a raised bottom or a deformed metal pan on the electromagnetic induction heating type heater on the top plate of the heating cooker, the pan may abnormally generate heat and become extremely hot. However, according to the structure of the top plate of the present invention, the portion corresponding to the electromagnetic induction heating type heater on the back surface of the top plate is not coated with an organic paint that changes color at the temperature during abnormal heat generation. Since the coating is protected with an inorganic coating, the coating is not discolored, and reflection on the top plate is avoided, thereby preventing the appearance of the top plate from being deteriorated. Moreover, the covering power is increased by coating the inorganic paint and the organic paint in layers, and the built-in parts other than the heater are not seen through the top plate.

  In such a top plate, it is desirable that a protective layer coated with an organic paint is provided on the heat-resistant layer limited to the corresponding part of the contact-type temperature sensor installed in the electromagnetic induction heating type heater. The reason is that this protective layer provides moisture resistance and prevents the oil component of the silicone grease adhering to the surface of the temperature sensor from penetrating, so that the inorganic paint of the heat-resistant layer bleeds and the color tone is impaired. It is for preventing.

  Further, it is preferable that a heat-resistant layer coated with an inorganic paint is provided on the surface of the top plate limited to the corresponding portions of the electromagnetic induction heating type heater. In this case, damage to the top plate due to the contact with the pan can be reduced and the pan can be prevented from slipping, and the built-in electromagnetic induction heater can be prevented from being seen through the top plate surface. In the present invention, even if abnormal heat generation should occur, the paint will not be discolored and reflection on the top plate will be avoided, so the color of the color pigment of the paint coated on the top plate is particularly affected by the reflection of white or This is effective for light color systems.

  According to the present invention, it is possible to prevent various problems such as discoloration of organic paint due to abnormal heat generation, which is a factor causing deterioration in the appearance of the top plate, and discoloration of inorganic paint due to penetration of silicone grease of the temperature sensor, and each heater. The built-in components other than the heater and the heater are concealed with an inorganic paint so that they cannot be seen through the top plate. Therefore, in the past, in order to prevent reflection of various built-in components, design had to be provided using a dark paint, but in the present invention, white and light paints that are likely to be reflected are also inexpensive. Since it can be used with the heart, there is no restriction on the color selection of the paint as the background of the top plate, and the effect of greatly improving the color tone and design freedom imparted to the top plate can also be obtained.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a perspective view showing a cooking device to which the top plate of the present invention is applied, FIG. 2 is a plan view of the top plate viewed from the back side, FIG. 3 is a cross-sectional view of the top plate, and FIG. It is explanatory drawing which shows the effect | action of a vessel.

  The heating cooker 10 shown in FIG. 1 is installed in the cabinet 2 of the system kitchen 1 and includes a heater body 30 and a top plate 40.

  The heater body 30 is a housing 31 in which a heating body 32 is built. The housing 31 is fitted and fixed in the opening 4 provided in the countertop 3, and the internal space is partitioned into three chambers by the upper and lower partition plates 311 and the left and right partition plates 312.

  In the upper chamber of the upper and lower partition plates 311, two electromagnetic induction heating heaters 321 are built in the front left and right as the heating body 32, and one radial heater 322 is built in the rear center. The electromagnetic induction heating type heater 321 is composed of a magnetic force generating coil. When a magnetic line is generated by energizing this coil, the magnetic line changes to an eddy current when passing through the metal pan, and the electric resistance of the metal causes the pan. It generates heat and is heated. On the other hand, the radiant heater 322 is composed of a conductor having a large electric resistance such as a nichrome wire wound in a coil shape, and heats the heater by energizing the conductor to heat it. Besides, heat-resistant glass pans can also be used. Note that the temperature of the surface of the top plate 40 is heated to about 550 ° C. by the heat generated by the radial heater 322.

  A roaster section is disposed in one chamber of the left and right partition plates 312, and a sheathed heater 323 is installed as the heating body 32. The sheathed heater 323 is configured by inserting a conductor made of nichrome wire or the like in the center of a metal tube, and filling the periphery of this conductor with insulating powder having high thermal conductivity, and heat generated by energizing the conductor. Heat is conducted through a metal tube. An inverter unit 33 is disposed in the other chamber of the left and right partition plates 312, and the electric power supplied to each heating body 32 of the electromagnetic induction heater 321, the radiant heater 322, and the sheathed heater 323 is provided here. A control circuit board to be controlled is incorporated. Reference numeral 34 denotes a power cord for supplying power.

  A temperature sensor 35 is installed at the center of the electromagnetic induction heater 321. The temperature sensor 35 of the present embodiment is a contact type sensor that utilizes the characteristics of a thermistor whose resistance value changes with temperature. The sensor 35 includes a thermal element in which the thermistor 352 connected to the lead wire 351 is covered with a silicone grease 353 as a thermal diffusing agent. The thermal element is biased to the back surface of the top plate 40 by a spring 354. It has become. The sensor 35 transmits the heat of the metal pan placed on the top plate 40 to the thermosensitive element brought into pressure contact with the top plate 40 and detects the temperature by the thermistor 352. The sensor 35 is connected to the control circuit board of the inverter unit 33. When the temperature of the pan detected by the sensor 35 rises abnormally, the energization to the magnetic force generating coil of the electromagnetic induction heater 321 is stopped. It is designed to prevent airing.

  Reference numeral 36 denotes a control panel, which is fitted into an opening 6 formed in the curtain plate 5 of the cabinet 2 and is integrated in advance on the outer wall surface of the housing 31 with screws. The control panel 36 is provided with an operation unit including a power switch 361 of the heater body 30, a power adjustment knob 362, and a timer setting button 363.

  The top plate 40 is detachably attached to the casing 31 of the heater main body 30, and the upper surface openings of the electromagnetic induction heater 321 and the radial heater 322 built in the upper chamber of the casing 31 are provided. It has a function to open and close freely. The top plate 40 includes a top plate 41 made of crystallized glass having transparency, and a metal frame 42 welded to the peripheral edge of the top plate 41. Incidentally, a low thermal expansion crystallized glass (product name “Neoceram N-0”, manufactured by Nippon Electric Glass Co., Ltd.) excellent in thermal shock resistance and mechanical strength is used for the top plate 41 of the present embodiment.

  A recess 421 is formed behind the frame body 42 along the width direction of the top plate 40, and exhaust holes 422 are opened in a row in the recess 421. The exhaust port 422 communicates with an exhaust duct 37 that exhausts hot air and smoke generated in the roaster section, and an exhaust cover 44 is recessed above the exhaust port 422 to prevent the cooking residue generated on the top plate 40 from falling. It is fitted and fixed to the part 421.

  On the surface side of the top plate 41, that is, the cooking surface side on which the pan is placed, heat resistant layers 411,. The heat-resistant layer 411 is coated only on the portions corresponding to the two electromagnetic induction heaters 321 on the front left and right and the one radiant heater 322 on the rear center, and has high heat resistance on the crystallized glass. An inorganic paint having properties is printed and baked and cured at a temperature of about 840 ° C. The heat-resistant layer 411 thus provided has a role of indicating a heating region of the heater, a role of reducing damage to the top plate 41 due to contact with the pan, and a role of preventing the pan from sliding. Further, by using an inorganic paint containing a dark color pigment, the built-in electromagnetic induction heater 321 and the radiant heater 322 can be seen through the top plate 41 and become invisible. Further, in front of the top plate 41, a visual recognition window 43 for emitting and displaying a thermal power display lamp and a high temperature caution lamp is provided.

  A printing process as shown in FIGS. 2 and 3 is performed on the back side of the top plate 41, that is, on the heater body side, with the portion of the viewing window 43 being uncoated. A heat-resistant layer 412 is provided on the back surface of the top plate 41 as a first layer. This heat-resistant layer 412 is provided over the entire back surface of the top plate 41, and is obtained by printing an inorganic paint having high heat resistance on crystallized glass and baking and curing it at a temperature of about 840 ° C. The heat-resistant layer 412 provided in this way can impart design properties to transparent crystallized glass and can have heat resistance against normal heat generation of the radiant heater 322 and abnormal heat generation of the electromagnetic induction heater 321. In this embodiment, an inorganic paint containing titanium white as a color pigment is used so that the appearance of the top plate 40 has a bright white tone.

  A protective layer 413 is provided on the back surface of the top plate 41 as a second layer. This protective layer 413 is provided over the entire area excluding portions corresponding to the electromagnetic induction heater 321 and the radiant heater 322, and an organic paint is printed on the heat-resistant layer 412 made of an inorganic paint at a temperature of about 280 ° C. Bake-hardened. In addition, an organic paint is applied on top of the inorganic paint to increase the concealing power, prevent the transmission of various parts other than the heater built in the housing 31, and make it invisible from the surface of the top board 41. is there. The reason for coating except the heater-corresponding portion is that when the pan cooked by the electromagnetic induction heater 321 is abnormally heated, the organic paint of the protective layer 413 exceeds the limit of the heat-resistant temperature due to the high heat at the abnormal heat generation. This is to prevent discoloration.

  Further, a protective layer 414 is also provided at the center of the heater corresponding portion. The protective layer 414 is coated only on the corresponding part of the temperature sensor 35 installed in the center of the electromagnetic induction heater 321. The organic layer is printed on the heat-resistant layer 412 made of an inorganic paint, and the protective layer 414 is approximately coated. Bake-hardened at a temperature of 280 ° C. The protective layer 414 prevents the oil component of the silicone grease 353 fixed to the surface of the temperature sensor 35 from adhering to and permeating the inorganic paint, and the inorganic paint of the heat-resistant layer 412 bleeds and its color tone is impaired. It has a function to prevent this.

  The inorganic paint constituting the heat-resistant layers 411 and 412 provided on the front and back surfaces of the top plate 41 has a high baking resistance and high heat resistance that does not cause discoloration even at a temperature of about 550 ° C., which is higher than the temperature during abnormal heat generation. In addition, it has excellent thermal conductivity. On the other hand, the organic paint constituting the protective layers 413 and 414 provided on the back surface of the top plate 41 has a low baking temperature and discoloration even at a temperature of about 240 ° C. Although it is inferior, it has excellent moisture resistance. The thickness of the coating film of the inorganic paint and the organic paint is sufficient if it is about 20 μm.

  The inorganic paint of this embodiment is a paste obtained by kneading an inorganic pigment mainly composed of titanium oxide and a glass frit containing boron oxide or barium oxide in a solvent, and is included in the coating component after coating. A glass frit forms a coating film with excellent heat resistance. The heat-resistant layer 411 on the front surface side increases the glass frit ratio to form a dense coating film, and the heat-resistant layer 412 on the back surface side decreases the glass frit ratio to form a porous coating film. .

  The organic paint of this embodiment is a paste obtained by kneading an inorganic pigment mixed with titanium oxide and carbon black and an organic silicone resin in an organic solvent containing xylene, ethylbenzene, or high-boiling aromatic naphtha. A film having excellent moisture resistance is formed by the silicone resin contained in the coated film component. In addition, as a commercially available organic coating material, Terpus GSX-302 (Daishin Paint Co., Ltd. product name) is mentioned.

  Then, the effect | action of this heating cooker is demonstrated, referring FIG. 1 and FIG.

  As shown in FIG. 4, when the metal pan 7 is first placed on the heat-resistant layer 411 of the top plate 40 and the power switch 361 in FIG. 1 is pressed to turn on the power, the inverter unit 33 causes the electromagnetic induction heater 321 to be turned on. The magnetic force generating coil is energized. Then, magnetic lines C surrounding the magnetic force generating coil are generated, and when the magnetic lines C pass through the metal pan 7, the eddy current D is changed and the pan 7 generates heat due to the electric resistance of the metal. Thereby, the foodstuff in the pan 7 is cooked by heating. At this time, the temperature of the pan 7 is detected by the temperature sensor 35, and is normally controlled in a normal temperature range of about 150 to 200 ° C. by the control circuit board in the inverter unit 33.

  Here, when the pan 7 has a flat bottom surface as shown in FIG. 4a, the pan bottom 7a and the heat-resistant layer 411 are in contact with each other over a wide area. For this reason, the heat of the pan 7 is quickly conducted to the top plate 41 through the heat-resistant layer 411 having excellent thermal conductivity, and is transmitted to the heat sensitive element of the temperature sensor 35 pressed against the top plate 41, so that accurate temperature detection is possible. Can be expected. Further, when the temperature of the pan 7 detected by the temperature sensor 35 rises beyond the normal temperature range, the inverter unit 33 stops energizing the magnetic force generating coil to prevent the emptying.

  On the other hand, when the cooker mistakenly uses the raised bottom or the deformed pan 7 as shown in FIG. 4b, the contact area between the pan bottom 7a and the heat-resistant layer 411 is narrow, and a gap g is generated between the two. The air accumulated in the gap g acts as a heat insulating layer, so that the heat of the pan 7 is hardly transmitted to the top plate 41. Therefore, the heat conduction from the top plate 41 to the heat sensitive element is delayed, and as a result, the temperature detection of the temperature sensor 35 is delayed and the pan 7 is abnormally heated. At this time, the temperature of the pan 7 becomes a high temperature of about 420 to 450 ° C. depending on the case, and accordingly, the heater corresponding portion of the top plate 40 is similarly heated.

  However, in the top plate 40, the protective layer 413 made of organic paint is not provided at the corresponding position of the electromagnetic induction heater 321 on the back surface of the top plate 41, and is protected by the heat-resistant layer 412 made of inorganic paint. . For this reason, even if the heater-corresponding portion is heated to a high temperature due to abnormal heat generation, the organic paint does not discolor beyond the limit of the heat-resistant temperature, so that reflection on the top plate 41 is avoided and the appearance of the top plate 40 looks good. Decline can be prevented.

  Further, a protective layer 414 made of an organic paint having excellent moisture resistance is provided at a location corresponding to the temperature sensor 35, and contact between the inorganic paint and the silicone grease 353 of the heat sensitive element is cut off. For this reason, it is possible to prevent the oil component of the silicone grease 353 from adhering to and penetrating the inorganic paint, and to surely prevent the color of the inorganic paint from spreading and impairing its color tone.

  As described above, according to the heating cooker 10 of the present embodiment, various types such as discoloration of the organic paint due to abnormal heat generation, which causes the appearance of the top plate 40 to deteriorate, and discoloration of the inorganic paint due to the penetration of the silicone grease 353, etc. Trouble is prevented. In addition, the electromagnetic induction heating type heater 321 and the radiant heater 322 built in the casing 31 are concealed by a heat resistant layer 411 on the top plate 41 surface, and other built-in parts are protected from the heat resistant layer 412 on the back surface of the top plate 41. It is hidden by the layer 413 and cannot be seen through the top plate 41. Therefore, it is possible to effectively prevent the appearance appearance from being deteriorated particularly in the top plate 40 in which the background of the top plate 41 has a bright color tone of white or light color.

The perspective view which shows the heating cooker to which the top plate of this invention is applied. The A direction arrow directional view of FIG. FIG. 3 is a sectional view taken along line BB in FIG. 1. Explanatory drawing which shows the effect | action of a heating cooker.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... System kitchen 2 ... Cabinet 3 ... Countertop 4 ... Opening part 5 ... Curtain board 6 ... Opening part 7 ... Pan 10 ... Heating cooker 30 ... Heater main body 31 ... Case 311 ... Upper and lower partition board 312 ... Left and right partition board 32 ... Heating body 321 ... Electromagnetic induction heater 322 ... Radiant heater 323 ... Sheath heater 33 ... Inverter unit 34 ... Power cord 35 ... Temperature sensor 351 ... Lead wire 352 ... Thermistor 353 ... Silicone grease 354 ... Spring 36 ... Control panel 361 ... Power switch 362 ... Power adjustment knob 363 ... Timer setting button 37 ... Exhaust duct 40 ... Top plate 41 ... Top plate 411, 412 ... Heat-resistant layer 413, 414 ... Protective layer 42 ... Frame body 421 ... Depression part 422 ... Exhaust port 43 ... Viewing window 44 ... Exhaust cover

Claims (3)

  A top plate mounted on a heater body with a built-in electromagnetic induction heater. A heat-resistant layer coated with inorganic paint is provided on the back of the top plate made of crystallized glass. A top plate having a protective layer coated with an organic paint except for corresponding portions of an electromagnetic induction heater.   The top plate according to claim 1, wherein a protective layer coated with an organic paint is provided on a heat-resistant layer limited to a corresponding portion of a contact-type temperature sensor installed in an electromagnetic induction heating heater. Top plate characterized by   2. The top plate according to claim 1, wherein a heat-resistant layer coated with an inorganic paint is provided on the top surface of the top plate so as to be limited to the corresponding portions of the electromagnetic induction heating type heater.

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