JP6299440B2 - Hot plate - Google Patents

Description

  The present application relates to a hot plate including a main body case and a cooking plate placed on the main body case, and in particular, includes a ceramic ceramic plate as a cooking plate, and is fixed to the ceramic plate with an induction heating coil in the main body case. The present invention relates to a hot plate for heating a heating element.

  The cooking plate placed on the main unit case is heated by the heater in the main unit case and can be used for various types of cooking such as grilled meat and okonomiyaki. However, the demand is expanding with the increase of the chance to eat and the trend of home parties. Also, in recent years, in addition to the flat cooking plate, a plate with a shape suitable for specific cooking, such as for takoyaki, and a special shape with the function of dropping the cooking oil into the housing in the main body case Many types of cooking plates, such as plates, are set, and hot plates that allow users to use various types of cooking plates according to their cooking purpose and preference are gaining popularity.

  In such a hot plate, in order to heat the cooking plate formed of a steel plate having high thermal conductivity by radiant heat from the heater, a temperature distribution occurs depending on the distance from the heater placement position of each part of the cooking plate, There exists a subject that the temperature of a cooking plate becomes difficult to become uniform. As a hot plate for solving such a problem, there is one in which a heat storage member made of an aluminum material, a copper material, or the like is disposed between a heater and a cooking plate (see Patent Document 1). In addition, an induction heating coil is used as a heating means for heating the cooking plate, and the cooking plate is self-heated by the induction heating coil, and a heat insulating member made of a nonmagnetic material is arranged on the lower surface of the cooking portion rate (patent). Reference 2).

JP 2010-063579 A Japanese Patent Laid-Open No. 09-102386

  In the above-described conventional hot plate, the heat distribution of the metal cooking plate is maintained by the heat storage member or the heat insulating member, so that the temperature distribution on the cooking plate surface is made as uniform as possible, and for example, when food is added In addition, it is possible to prevent the temperature of the cooking plate of the part from dropping sharply.

  However, there is no change in using a metal plate such as steel as the cooking plate, and there is a limit to ensuring uniformity of the cooking plate temperature. On the other hand, in an electric heating cooker other than a hot plate, for example, a rice cooker, by using a pottery inner pot, it is possible to cook more deliciously by taking advantage of the high heat retention property of a pottery pot different from a metal one. Although what can be proposed is proposed, the thing using the ceramic cooking plate as a hot plate has not been realized.

  The present disclosure solves such problems of the conventional technology, and an object thereof is to obtain a hot plate using a pottery-made cooking plate having a high heat storage property.

In order to solve the above problems, a hot plate of the present disclosure includes a main body case, an induction heating coil disposed in the main body case, a cover member that is positioned on an upper surface of the main body case and covers the induction heating coil, A plate-shaped ceramic plate placed on the cover member; and a plate-shaped heating element fixed to the lower surface side of the ceramic plate and generating heat by the induction heating coil to heat the ceramic plate. The porcelain plate has a central portion in which the heating element is disposed and a flange portion formed so as to surround the central portion, and the thickness of the flange portion is larger than the thickness of the central portion. Features.

  In the hot plate of the present disclosure, the ceramic plate includes a central portion where the heating element is disposed and a flange portion formed so as to surround the central portion, and the thickness of the flange portion is larger than the thickness of the central portion. Has been. For this reason, the temperature rise of a flange part can be suppressed compared with a center part, and position control of the ceramic plate on a main body case can be performed with a simple structure.

It is a perspective view showing the appearance of the hot plate concerning an embodiment. It is an exploded perspective view showing the whole hot plate composition concerning an embodiment. It is sectional drawing explaining the structure inside the hotplate concerning embodiment. It is sectional drawing which shows the structure of the ceramic plate of the hot plate concerning an embodiment. It is a principal part expanded sectional view explaining the structure of the flange part of a ceramic plate.

  A hot plate disclosed in the present application includes a main body case, an induction heating coil disposed in the main body case, a cover member that is located on an upper surface of the main body case and covers the induction heating coil, and is mounted on the cover member. A ceramic plate placed on the lower surface of the ceramic plate, and a plate-like heating element that generates heat by the induction heating coil and heats the ceramic plate. And a flange portion formed so as to surround the central portion, and the thickness of the flange portion is larger than the thickness of the central portion.

  By providing the hot plate according to the present disclosure with the above-described configuration, the thickness of the flange portion formed so as to surround the central portion is larger than the thickness of the central portion that is the cooking surface where the heating element of the ceramic plate is disposed and becomes high temperature. The thickness can be increased. For this reason, the temperature rise of the flange portion can be moderately suppressed as compared with the central portion of the ceramic plate, and the member for positioning the ceramic plate when placing the ceramic plate on the body case of the hot plate is made of resin. Thus, the configuration of the hot plate can be made simpler.

  In the hot plate disclosed in the present application, it is preferable that the flange portion is formed obliquely outward from the central portion. By doing in this way, various cooking, such as a soup dish, can be performed using the ceramic plate with a flat cooking surface.

  The lower surface of the porcelain plate is formed such that the central portion is recessed rather than the connecting portion with the outer edge of the flange portion, and when the porcelain plate is placed on the cover member, the heating element and the cover It is preferable that a gap is formed between the members. In this way, the temperature rise of the cover member during cooking can be maintained so as not to become excessive, and the heating element is damaged when the ceramic plate is placed on a table such as a table. Can be effectively avoided.

  Furthermore, it is preferable that a standing wall portion projecting vertically upward is formed at the upper end portion of the flange portion. In this way, the standing wall can be used as a positioning member when placing the lid on the ceramic plate, and the discharge direction of water vapor or the like released from the space between the lid and the ceramic plate to the external space, It can be directed vertically upward.

  In addition, it is preferable that the ceramic plate is circular in plan view, and the flange portion is formed in an annular shape surrounding the central portion in plan view.

  Further, the induction heating coil has an annular shape in plan view, the heating element has a circular shape in plan view, and the induction heating coil, the ceramic plate, and the heating element are arranged substantially coaxially with respect to one common axis. It is preferable that By doing in this way, a ceramic plate can be efficiently heated using the ring-shaped induction heating coil which can be formed easily.

  Hereinafter, a detailed configuration of an embodiment of a hot plate provided with a pottery-made cooking plate disclosed in the present application will be described with reference to the drawings.

(Embodiment of the Invention)
FIG. 1 is a perspective view showing the overall configuration of the hot plate according to the present embodiment.

  As shown in FIG. 1, the hot plate of the present embodiment is placed on a main body case 30, a ceramic plate 20 that is a ceramic cooking plate placed on the main body case 30, and further on the ceramic plate 20. And a possible lid 10. In the hot plate of the present embodiment, the lid 10 is also made of earthenware like the cooking plate. The main body case 30, the ceramic plate 20 and the lid 10 are all circular when viewed from above.

  In the hot plate of the present embodiment, a switch 31 and an operation button 32 are arranged on the side surface portion of the main body case 30 for the user to operate the hot plate. The switch 31 and the operation button 32 constitute an operation unit together with a lamp (not shown) indicating the operation state of the hot plate.

  Next, a more detailed configuration of the hot plate of the present embodiment will be described using the exploded perspective view of FIG. 2 and the cross-sectional view of FIG.

  As shown in FIG. 2, in the hot plate of the present embodiment, the main body case 30 is composed of a deep dish-shaped lower casing 34 and an annular upper casing 33 that covers the upper surface of the outer peripheral portion of the lower casing 34. ing. A disc-shaped cover member 35 is disposed inside the upper housing 33 so as to cover the upper surface of the induction heating coil (not shown in FIG. 2) disposed inside the main body case 30. The hot plate of the present embodiment uses a crystallized glass with high heat resistance as the cover member 35, but as the cover member 35, in addition to the crystallized glass, other various tempered glass materials, Alternatively, a resin material having high heat resistance such as PPS resin (polyphenylene sulfide resin) can be used.

  The upper housing 33 is formed with a pair of recessed portions 36 at portions facing each other to facilitate placement and removal of the ceramic plate 20 on the cover member 35.

  The porcelain plate 20 has a flat portion 21 that serves as a cooking surface on which an object to be cooked is placed and cooks, and a flange portion 22 that is formed so as to surround the flat portion 21 and extends obliquely outward. It is flat. Here, the fact that the ceramic plate 20 has a flat plate shape indicates that the entire shape of the ceramic plate or a flat plate is mainly used. For this reason, on the cooking surface of the porcelain plate 20, there is a slight amount to make the temperature distribution during cooking uniform, to prevent the cooking object from being burnt, and to collect oil, moisture, etc. from the cooking object on the periphery. Including the case where irregularities are formed. Further, the overall shape of the porcelain plate 20 does not include a so-called pan-shaped pan having a side wall portion extending upward, but the above-described flange portion 22 extending obliquely outward from the cooking surface is formed. Including things. In the hot plate according to the present embodiment, since the flange portion 22 is formed on the ceramic plate 20, the so-called soup dish is supported in addition to grilled dishes such as grilled meat and okonomiyaki.

  A standing wall portion 23 is formed on the flange portion 22 of the ceramic plate 20 so as to protrude vertically upward from the upper end portion thereof.

  A heating element 24 (see FIGS. 3 and 4), which is a layered product containing fine metal powder such as silver paste, is disposed on the lower surface of the ceramic plate 20 that is the back side of the flat portion 21. . The configuration of the heating element 24 will be described in detail later.

  The lid 10 in the hot plate of the present embodiment has a dome shape in which the central portion 11 is curved upward and protrudes. In the upper center of the lid 10, a handle 12 having a tip formed in an annular shape is formed. In addition, a steam hole 13 is formed in the dome-shaped central portion to allow steam, smoke, etc. generated during cooking using the lid 10 to escape to the outside.

  FIG. 3 is a cross-sectional view for explaining the internal configuration of the hot plate according to the present embodiment. FIG. 3 shows a cross-sectional configuration of the hot plate according to the present embodiment cut along a plane including the position where the operation buttons 32 are arranged.

  As shown in FIG. 3, an induction heating coil 41 is arranged inside the main body case 30 so as to be covered with the cover member 35 described above. In the hot plate of this embodiment, the induction heating coil 41 is formed by an annular outer annular coil 41a and an inner annular coil 41b, and the outer annular coil 41a and the inner annular coil 41b are supported by a support plate 42. Thus, the upper surface of the induction heating coil 41 is arranged close to the surface of the cover member 35 on the inner surface side of the main body case 30. Further, the support plate 42 supports the center of each of the annular coils 41a and 41b so as to overlap with the center of the cover member 35, and when the ceramic plate 20 is placed on the cover member 35, The center of the porcelain plate plate 20 and the center of the annular coils 41a and 41b coincide on the common axis 50 in the vertical direction, and the porcelain plate plate 20 and the induction heating coil 41 are arranged coaxially with each other.

  The support plate 42 supports a temperature sensor 43 that detects the temperature of the cover member 35 at a position on the inner surface side of the main body case 30 in the central portion of the cover member 35 located on the common shaft 50. In the hot plate of this embodiment, since the temperature sensor 43 can directly contact the cover member 35 and measure the temperature, a known temperature detection element such as a thermoelectric conversion element or a thermocouple can be used as the temperature sensor 43. The temperature sensor 43 can detect the temperature of the common shaft 50 portion of the heating element 25 disposed on the lower surface side of the ceramic plate 20 placed on the cover member 35 via the cover member 35.

  An electric circuit board 44 on which electric circuit elements such as a power supply circuit and a control circuit for driving the hot plate are arranged is arranged below the support plate 42 in the main body case 30. In addition, on the back side of the operation button 32 disposed in the upper housing 33 of the main body case 30, a switch operation in the operation unit including the operation button 32 is detected and converted into an electric signal, and is disposed in the operation unit. A switch circuit board 45 on which various electric circuit components for lighting an operation lamp is mounted is disposed. The switch circuit board 45 is connected to the electric circuit board 44 by an electric wiring member (not shown), and controls power supply to the induction heating coil 41 in particular in a hot plate such as a microcomputer (not shown) arranged on the electric circuit board 44. The user operation in the operation unit is transmitted to the control unit. The control unit can be arranged on the switch circuit board 45, and a control circuit board can be provided in addition to the electric circuit board 44 and the switch circuit board 45 and arranged at a desired position in the main body case 30. it can.

  An air cooling fan 46 is disposed below the support plate 42. The air cooling fan 46 operates during operation of the hot plate, takes in outside air from the air holes 36 formed in the bottom surface portion of the lower housing 34 of the main body case 30, and has an induction heating coil 41 that becomes high temperature during operation; The circuit components on the electric circuit board 44 are cooled.

  Note that three or four legs 37 are disposed on the bottom surface of the lower housing 34, and the hot plate can be disposed on a mounting table such as a table without rattling, and the lower housing 34 is also provided. A predetermined gap is ensured between the bottom surface of the substrate and the top surface of the mounting table so that outside air can be reliably taken in from the air holes 36.

  The porcelain plate 20 is placed on the cover member 35 with its center overlapping the common shaft 50. On the lower surface side of the porcelain plate plate 20 on which the heating element 24 is formed, a convex annular rib 25 is formed on the peripheral portion, and the porcelain plate plate 20 is placed on the cover member 35 and the heating element. A very small gap is formed between the surface of 24 and the cover member 35 so that the heat of the heating element 24 is not directly transmitted to the cover member 35.

  In the hot plate of the present embodiment, a sheet-like silver paste is adhered to the lower surface of the ceramic plate 20 as the heating element 24. The heating element 24 is formed in a circular shape in plan view, and the center of the heating element 24 is located on a common shaft 50 that overlaps the center of the ceramic plate 20. For this reason, when the porcelain plate plate 20 is viewed from the lower surface side, the heating elements 24 are arranged concentrically with respect to the porcelain plate plate 20. In addition, since the center of the heating element 24 is located on the common shaft 50, the induction heating coil 41 and the heating element 24 that are also arranged so as to be centered on the common shaft 50 can be arranged concentrically. The heating element 24 can be heated using the induced electromotive force from the induction heating coil 41 without loss.

  In the hot plate of the present embodiment, by using a sheet-like member as the heating element 24, the shape and the formation position of the heating element 24 can be accurately defined, and a plurality of sheet-like heating elements 24 are stacked. By doing so, the thickness of the heating element 24 can also be controlled, and the heating element 24 in which the thickness of the predetermined portion is thicker than the thickness of the other portions can be easily formed. Such a sheet-like member can be easily prepared by applying and printing a silver paste or the like on a transfer sheet, for example.

  In addition, the method of fixing the heating element 24 to the lower surface side of the ceramic plate 20 is not limited to the method of sticking the sheet-like heating element member, and a method of drying after applying the paste-like heating element member, Various methods such as a method of directly forming a paste-like member such as a printing method in a predetermined shape on the lower surface of the porcelain plate can be employed.

  In addition to the silver paste described above, the heating element 24 may be any member that generates heat due to eddy currents generated by the induction heating coil 41. A paste material made of other metal powder such as aluminum paste or iron paste may be used. Form on the lower surface of the ceramic plate 20 by a method of using, a method of directly forming a layer of silver, aluminum, iron or the like by a vapor deposition method or a method of attaching a metal plate of silver, aluminum, iron or the like. Can do.

  In the hot plate of the present embodiment, the lid 10 is placed on the upper surface side of the flange portion 22 formed in the peripheral portion of the ceramic plate 20. Since the standing wall portion 23 that protrudes vertically upward is formed at the upper end portion of the flange portion 22, it serves as a positioning member when the lid 10 is placed on the flange portion 22, and the lid 10 slips down. Can be prevented. As a result, in the hot plate of the present embodiment, the center position of the lid 10 placed on the ceramic plate is also located on the common shaft 50.

  Further, the standing wall portion 23 at the distal end portion of the flange portion 22 is configured such that water vapor generated in the internal space of the lid 10 when cooking using the lid 10 is released when the water vapor or the like generated in the internal space of the lid 10 is discharged from the mounting portion of the lid 10 to the external space. It serves as a guide that directs the discharge direction upward. For this reason, it is possible to prevent a situation in which high-temperature steam jumps out from the hot plate in the peripheral direction during cooking.

  FIG. 4 is a cross-sectional view of the ceramic plate 20.

  On the lower surface of the ceramic plate 20, the circular heating element 24 having a circular shape in plan view is formed so as to be concentric with the ceramic plate 20 as described above. In addition, the lower surface of the ceramic plate 20 is formed with an annular rib 25 projecting downward on the peripheral portion thereof. Since the plate is made of porcelain plate, for example, a rib that goes vertically downward like a metal or resin plate cannot be formed only in the peripheral portion, and the peripheral portion of the lower surface of the porcelain plate plate 20 gently toward the rib 25 It has a shape that increases its thickness.

  In the hot plate of the present embodiment, the heating element 24 is adhered over the flat portion on the lower surface side of the ceramic plate 20, exactly the entire region where the upper surface is the flat portion 21. The heating element 24 has a shape in which a small-diameter portion 24b is laminated on a large-diameter portion 24a so that the thickness of the central portion is larger than the thickness of the peripheral portion. The large-diameter portion 24 a and the small-diameter portion 24 b of the heating element 24 are both arranged on a common shaft 50 whose center passes through the center of the ceramic plate 20, and are arranged concentrically with each other and with respect to the ceramic plate 20. ing. In this way, by forming the small-diameter portion 24b on the large-diameter portion 24a, the central small-diameter portion 24b in the main surface direction of the ceramic plate 20 becomes a thick-walled portion that is thicker than the other portions. The body 24 can be realized.

  FIG. 5 is an enlarged cross-sectional view of a main part showing the shape of the flange portion 22 of the ceramic plate 20.

  The flange portion 22 is formed so as to extend obliquely upward from a flat portion 21 as a cooking portion on which an object to be cooked is placed. A height h1 of the flange portion 22 from the flat portion 21 is 10.8 mm, and an upper wall portion 23 having a height h2 = 5.2 mm protruding upward in the vertical direction is formed at the upper end portion of the flange portion 22.

  In addition, by forming the wall surface 23a of the standing wall portion 23 at the center portion side of the ceramic plate 20 as close to the vertical direction as possible, the effect of restricting the mounting position of the lid 10 provided in the standing wall portion 23 described above, The effect of preventing horizontal diffusion can be exerted more strongly. In addition, since it is a plate made of a ceramic plate, the wall surface 23a of the hot plate of the present embodiment is a surface inclined by 35 ° with respect to the vertical direction because of restrictions on manufacturing and shape that can prevent cracks and the like. It has become.

  The rib 25 on the lower surface side peripheral portion of the ceramic plate 20 is formed to have a height h3 of 1.5 mm from the back side portion of the flat portion 21 to which the heating element 24 is adhered, and the thickness of the thick portion is Even when the heating element 24 of about 55 μm is attached, the heating element 24 does not protrude to the lower surface side of the ceramic plate 20. By doing in this way, even when the ceramic plate 20 is directly placed on a mounting table such as a table, the heating element 24 does not directly touch the mounting table, and the heating element can be prevented from being damaged. Further, the rib 25 can prevent the heating element 24 and the cover member 35 from contacting each other during cooking, thereby preventing an excessive temperature rise of the cover member 35.

  In the hot plate according to the present embodiment, the thickness t2 of the flange portion 22 is set to be lower than the thickness t1 of the central portion of the ceramic plate plate in which the heating element 24 is attached to the lower surface side and the upper surface side is the flat portion 21 that is the cooking surface. It is thick. As described above, the heating element 24 is not disposed in the flange portion 22, and the thickness of the flange portion is increased compared to the central portion, which is the portion where the heating element is disposed, so that the heat of the heating element is increased. Can be difficult to communicate.

  For this reason, when the ceramic plate is placed on the cover member, the upper housing 33 of the main body case 30 that restricts the flange portion from the outside can be formed of a resin material, and the cost of the hot plate can be reduced. it can.

  In the hot plate of this embodiment, the thickness t1 of the central portion is 8 mm, and the thickness t2 of the thick portion from the flat central portion, which is the thickness of the flange portion, to the flange portion is 11.4 mm.

As described above, in the hot plate of the present embodiment, a ceramic ceramic plate is used as a cooking plate, and the ceramic plate has a flange portion thicker than the thickness of the central portion around the central portion serving as a cooking surface. It becomes the composition. By setting it as such a structure, compared with the center part which is a cooking surface, since the hot plate of this embodiment can suppress the temperature rise of a flange part, a ceramic plate is mounted on a main body case. As the positioning member, a resin member can be used, and a hot plate can be realized at low cost.

  In the above-described embodiment, the heating element is exemplified in which the thickness is different in the main surface direction of the ceramic plate and the thick portion is formed. However, as the heating element of the hot plate of the present disclosure, the thickness is An equivalent can be used.

  In the above embodiment, the temperature sensor is brought into contact with the cover member to directly measure the temperature of the cover member. However, a predetermined gap is provided between the temperature sensor and the cover member to indirectly cover the cover member. The temperature can be detected. In addition, a temperature sensor that directly or indirectly measures the temperature of the heating element fixed to the lower surface of the ceramic plate when the ceramic plate is placed, such as by providing an opening in the cover member, is arranged. can do.

  Further, in the above embodiment, the main body case, the ceramic plate, and the induction heating coil are all described as having a substantially circular shape in plan view. However, in the hot plate according to the present disclosure, it is not an indispensable requirement to make all of them circular in plan view. At least one plan view shape of the main body case, the ceramic plate, and the induction heating coil is substantially rectangular. The non-circular shape can be used. If at least one of the porcelain plate and induction heating coil is rectangular, the heating element takes into account the heat generation efficiency of the heating element by the induction heating coil and the temperature propagation form from the heating element to the porcelain plate. In some cases, it is preferable to use a rectangular shape instead of a circular shape. Of course, when the ceramic plate is rectangular, the central portion can be rectangular and the flange portion can be rectangular.

  In addition, it goes without saying that the planar shape of the main body case and the lid should be appropriately changed from a circular shape in accordance with the planar shape of the ceramic plate.

  The hot plate according to the present disclosure can realize more delicious cooking using a ceramic plate having high heat storage property, and is useful as a hot plate targeting a new customer group.

20 Ceramic plate 21 Flat part (center part)
22 flange portion 24 heating element 30 body case 35 cover member 41 induction heating coil t1 thickness of central portion t2 thickness of flange portion

Claims (4)

A body case,
An induction heating coil disposed in the body case;
A cover member located on the upper surface of the main body case and covering the induction heating coil;
A plate-shaped ceramic plate placed on the cover member;
A plate-like heating element fixed to the lower surface side of the porcelain plate plate and generating heat by the induction heating coil to heat the porcelain plate plate;
The porcelain plate has a central portion where the heating element is disposed, and a flange portion formed so as to surround the central portion,
The thickness of the said flange part is larger than the thickness of the said center part, The hot plate characterized by the above-mentioned. A body case,
An induction heating coil disposed in the body case;
A cover member located on the upper surface of the main body case and covering the induction heating coil;
A ceramic plate placed on the cover member;
A plate-like heating element fixed to the lower surface side of the porcelain plate plate and generating heat by the induction heating coil to heat the porcelain plate plate;
The porcelain plate has a flat central portion on which the heating element is disposed, and a flange portion formed so as to surround the central portion,
The thickness of the said flange part is larger than the thickness of the said center part, and the thickness becomes the largest in the part from the said center part to the said flange part, The hot plate characterized by the above-mentioned. A body case,
An induction heating coil disposed in the body case;
A cover member located on the upper surface of the main body case and covering the induction heating coil;
A ceramic plate placed on the cover member;
A plate-like heating element fixed to the lower surface side of the porcelain plate plate and generating heat by the induction heating coil to heat the porcelain plate plate;
The porcelain plate has a flat central portion on which the heating element is disposed, and a flange portion formed so as to surround the central portion,
The thickness of the flange portion is larger than the thickness of the central portion,
The hot plate is characterized in that when the ceramic plate is placed on the cover member, the upper housing of the main body case located outside the flange portion is formed of a resin material.   The hot plate according to any one of claims 1 to 3, wherein a standing wall portion projecting vertically upward is formed at an upper end portion of the flange portion.

Images