JP7336642B2 - heating cooker - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating cooker used in general households, commercial kitchens, etc., and a heating coil unit used for induction heating.

Conventionally, this type of heating cooker has a dedicated grill plate on which the object to be heated can be placed in the heating chamber, and is composed of a grill heating coil that performs induction heating on the bottom surface of the heating chamber, and cooks and heats through the bottom surface. A configuration is adopted in which the plate itself is induction-heated (see, for example, Patent Document 1).

Japanese Patent No. 6106845

However, in the above-described conventional configuration, only a specific heating plate is placed in the heating chamber. Depending on the shape of the pot, the temperature distribution of the pot may be uneven, causing uneven heating of the food placed on the pot. Ta.

The present invention solves the above-mentioned conventional problems, and in the grill heating coil attached to the lower surface of the heating chamber, the coil shape is changed from an elliptical double-wound coil to a circular inner heating coil, a middle heating coil, and an outer heating coil. By making the shape of the rectangular shape, the inner heating coil can heat a circular pot with the inner heating coil and the middle heating coil, and the rectangular or elliptical large pot can be heated with the inner heating coil, the middle heating coil, and the outer heating coil. The object of the above is to make the temperature distribution of the conventional heating plate uniform so that the heating can be efficiently performed without heating unevenness.

In order to solve the conventional problems, the heating coil unit of the present invention has three heating coils, the inner heating coil is circular, the middle heating coil is substantially rectangular, and the outer heating coil is substantially rectangular. .

As a result, even when the user tries to heat pots of various shapes, the temperature distribution can be made uniform and heating can be performed efficiently.

The heating coil unit of the present invention can heat the top surface of a heating cooker or the grill part even when pots of various shapes are placed on the surface, making the temperature distribution uniform and heating efficiently.

Schematic diagram of the configuration of a heating coil unit according to the first embodiment of the present invention Schematic configuration diagram of the heating coil unit according to the first embodiment of the present invention viewed from above Schematic configuration diagram of a heating coil unit according to a fourth embodiment of the present invention Sectional drawing of the heating coil unit of the 4th Embodiment of this invention FIG. 11 is a schematic diagram of a partial configuration of a heating coil unit according to a fifth embodiment of the present invention; Assembly cross-sectional view in the front-rear direction of the induction heating cooker according to the sixth embodiment of the present invention Assembly cross-sectional view in the left-right direction of the induction heating cooker according to the sixth embodiment of the present invention Fig. 10 is an assembly cross-sectional view in the vertical direction of the induction heating cooker according to the sixth embodiment of the present invention; Schematic configuration diagram of a heating coil unit according to a seventh embodiment of the present invention

A first invention comprises a heat-resistant insulating plate, a support for supporting the insulating plate, an inner heating coil disposed below the insulating plate and formed in a circular shape, and an outer circumference of the inner heating coil. By providing a middle heating coil formed with a gap in the middle heating coil and a substantially rectangular outer heating coil provided with a gap around the outer circumference of the middle heating coil, the user can use a circular, elliptical, or rectangular shape. Even when pots of various shapes are placed, the temperature distribution can be uniformed and heating can be performed efficiently, and the temperature distribution of the pots used during cooking can be improved, resulting in high cooking performance. can provide

In a second invention, in particular, in the heating coil unit of the first invention, a heating plate for cooking is provided on the insulating plate, and the external heating coil is arranged along the inside of the outer peripheral shape of the heating plate. The middle heating coil is provided with a substantially rectangular heating coil unit to make the temperature distribution of the dedicated heating plate uniform and allow the user to use other pots with the heating coil. Even when the temperature is increased, the temperature can be uniformly heated.

A third invention is particularly the heating coil unit of the first or second invention, wherein the number of turns of the middle heating coil is smaller than that of the inner heating coil, and the number of turns of the outer heating coil is smaller than that of the middle heating coil. By adopting the configuration, in the case of a circular pan, the inner heating coil is used to heat the entire pan so that the temperature distribution is uniform. In addition, in the case of a rectangular or elliptical pan, the inner heating coil heats the center of the pan, and the middle heating coil heats the edge of the pan, thereby uniformly heating the temperature distribution. becomes possible. In addition, with regard to a large size such as a dedicated heating plate, the inner heating coil cannot heat the center of the plate, the outer heating coil can heat the outer side of the plate, and the middle heating coil cannot heat the plate by inner heating and outer heating. By heating the part in between, it is possible to heat with good temperature distribution.

In a fourth invention, in particular, in the first or second invention, by providing a shape in which ferrite is arranged in the vicinity of four vertices of the external heating coil parallel to the long side of the external heating coil, the heating coil It is possible to improve the temperature distribution at the four outer corners, where the temperature distribution is particularly weak at the bottom. As a result, the temperature distribution can be made uniform even when a large plate or the like is used. In addition, by arranging ferrites at the four outer corners, when a circular pan is placed in the center, the pan is not placed on the ferrite, and when the heating plate is placed, the plate is placed on the ferrite. By taking the electric characteristic of the coil, it is possible to easily distinguish between a circular pot and a heating plate when judging the type of pot.

In a fifth aspect of the invention, in particular, the outer heating coil and the intermediate heating coil of the first aspect are shaped in a bow shape, and the inner heating coil and the inner heating coil are spaced apart from each other. The temperature distribution in the heating coil unit can be made uniform by separating the locations where the magnetic flux of the coils is concentrated in the locations where the heating coils are close to each other.

According to a sixth aspect of the present invention, there is provided a main body, a heating chamber arranged in the main body and having a front opening and a bottom portion formed of the insulating plate, and a heating coil unit according to claim 2 arranged below the heating chamber. and is mounted on the insulating plate and is capable of induction-heating the grill pan. With this configuration, it is possible to place and heat a wide variety of induction-heatable pots in the heating chamber, which has conventionally been configured to place and heat the grill dish, and can be used by consumers. In doing so, a wider range of cooking is possible.

In the seventh invention, in particular, in the heating coil unit attached to the bottom of the heating chamber of the sixth invention, By providing a temperature sensor and placing the heating coil unit slightly behind the center of the heating chamber, by providing two temperature sensors slightly behind the center and forward of the center of the heating chamber, It is possible to measure the bottom temperature of pots and grill plates of various shapes placed on the surface.

In the eighth invention, in particular, in the first invention, by providing a plurality of temperature sensors between each coil of the heating coil, even if the pot is placed at any point within the effective range of the heating coil, By placing at least one temperature sensor at the bottom of the pan, it is possible to measure the bottom temperature of the placed pan or grill pan.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the present invention is not limited by this embodiment.

(Embodiment 1)
1 and 2 show a heating coil unit according to a first embodiment of the invention.

As shown in FIG. 1, the heating coil unit according to the present embodiment includes an insulating plate 1 made of heat-resistant glass or the like, a support 2 for supporting the insulating plate 1, and a heating coil disposed below the insulating plate. It is composed of the coil unit 3 .

As shown in FIG. 2, the heating coil unit includes a circular inner heating coil 5, a rectangular middle heating coil 6 arranged on the outer circumference of the inner heating coil 5, and a rectangular heating coil 6 provided on the outer circumference of the middle heating coil. , and a heating coil base 8 fixes the three types of coils.

Between the inner heating coil 5 and the middle heating coil 6, and between the middle heating coil 6 and the outer heating coil 7, a space is provided between the coils. approaches, the magnetic flux of the coil and the like locally rises, reducing the variation in temperature distribution when heating a pan or the like.

The operation and action of the heating coil unit 3 configured as described above will be described below.

If a circular pot is placed in the center of the insulating plate 1, it will be positioned concentrically above the inner heating coil 5. As shown in FIG. Also, when an elliptical or rectangular pot or the like is placed on the insulating plate 1, the inner heating coil 5 is positioned above the central portion of the pot, and the middle heating coil 6 is positioned above the circumference of the pot. relationship. Further, when a large grill pan 4 or the like is placed on the insulating plate 1, the central portion of the grill pan 4 is positioned above the inner heating coil 5, and the outer wall of the grill pan 4 or the like is positioned above the outer heating coil 7. become. A circular inner heating coil 5, two rectangular middle heating coils 6, and an outer heating coil 7 secure an overlapping area between the bottom of various shapes of the pan and the coil part, so that the temperature distribution of the pan can be kept uniform. It becomes possible.

The inner heating coil 5, the middle heating coil 6, and the outer heating coil 7 are connected to a power supply circuit (not shown). Since the inductance and resistance of the coil change significantly depending on the overlapping area of the pot and the heating coil unit 3 when the pot is placed, it is placed on the insulating plate. It is possible to determine the type of pot that is used. Furthermore, in the case of a pot with a large mounting area and a circular shape when placed on the insulating plate 1, by combining the circular inner heating coil 5, the rectangular middle heating coil 6, and the outer heating coil 7. , the inductance and resistance of the coil when high-frequency power is supplied vary greatly depending on whether the coil is placed in the center or out of the center. By using this characteristic, the position of the pot placed on the heating coil unit 3 can be determined, and processing such as stopping heating can be performed when a circular pot or the like is not placed in the center.

In this embodiment, the inner heating coil 5, the middle heating coil 6, and the outer heating coil 7 are connected in series. Since the same effect can be obtained by the method, it is not limited to this.

In this embodiment as shown in FIG. 2, the four corners of the middle heating coil 6 and the outer heating coil 7 are rounded, but the present invention is not limited to this.

(Embodiment 2)
As shown in FIG. 1, a heating coil unit 3 is provided with an induction-heatable grill pan 4 made of a clad material of aluminum and stainless steel or the like placed on an insulating plate 1 . At that time, when the grill pan 4 is placed on the insulating plate 1, the shape of the external heating coil 7 is approximately similar to the outer circumference of the grill pan 4 so that the outer circumference of the grill pan 4 is positioned above the external heating coil 7. ing. The middle heating coil 6 has a shape similar to that of the outer heating coil 7 .

The operation and effect of the main body configuration of the heating coil unit configured as described above will be described below. Refer to the first embodiment for the same contents as the first embodiment regarding the operation and effect.

First, consider the case where the grill pan 4 is heated in the above configuration. A grill pan 4 is placed on the insulating plate 1. - 特許庁Then, as in the above configuration, the central portion of the grill pan 4 is positioned above the inner heating coil 5 and the outer peripheral portion of the grill pan 4 is positioned above the outer heating coil 7 . In addition, in the grill pan 4, the entire grill pan 4 can be uniformly heated by disposing the middle heating coil 6 in the middle of the portion that cannot be heated by the inner heating coil 5 and the outer heating coil 7. It becomes possible. Next, when a circular or elliptical pan or the like is placed, heating can be performed as shown in the first embodiment.

Further, by placing the external heating coil 7 below the outer peripheral portion of the grill pan 4, the outer periphery of the grill pan 4 can be efficiently heated, and the side walls of the grill pan 4 can be easily heated. is also obtained. As a result, uneven heating of the food placed on the corners of the grill pan 4, which occurs when the food is placed on the entire grill pan 4, can be prevented from the sides by efficiently warming the side walls of the grill pan. It becomes easier because heat can be transferred.

As a result, it becomes possible to heat a wide variety of pots even in a grill chamber of an induction heating cooker or a hot plate using induction heating, which has conventionally mainly been used to heat a dedicated plate.

(Embodiment 3)
In the heating coil unit 3 having the configuration shown in FIG. 2, the inner heating coil 5 is a single-wound coil, and the number of turns is 13, and the middle heating coil 6 is also a single-wound coil. The number of turns is 11, and the outer heating coil is also a single-wound coil and has 6 turns, so that the number of turns decreases from the inner coil to the outer coil. .

The operation and effect of the main body configuration of the heating coil unit configured as described above will be described below.

By increasing the number of turns of the inner heating coil 5, a circular coil that is concentric with the circular pot placed in the center of the insulating plate 1 is used to ensure temperature unevenness during heating. ing. Therefore, in the inner heating coil located in the center, it is necessary to heat the circular pan with good temperature distribution. In a coil that performs induction heating, increasing the number of turns of the coil facilitates induction heating and heating. Therefore, in order to efficiently heat a circular pot, which has the most common shape, the number of turns of the inner heating coil 5 is increased to cope with the heating of the circular pot.

Next, the middle heating coil 6 is used to keep the temperature distribution uniform when heating non-circular pans, mainly rectangular or elliptical pans. In the heating coil unit 3, since the inner heating coil 5 described above heats the central portion of the placed pot, the object is to heat the periphery thereof. For this reason, the temperature distribution during heating of the pot is improved by reducing the number of windings compared to the central portion. Furthermore, even in a circular pot that is larger in shape than the inner heating coil 5, since it is placed above the middle heating coil, efficient heating is possible using the inner heating coil 5 and the middle heating coil 6. .

In addition, the external heating coil 7 is a coil used when heating a large object such as the grill pan 4 described above, and the majority of the cooking surface is covered by the internal heating coil 5 and the intermediate heating coil 6. ing. Therefore, the external heating coil 7 located outside does not require a large number of turns since it is for some pots.

In addition, in the heating coil unit 3 of the present embodiment, it is assumed that the pot is placed in the center, and if it is placed in a position other than that, the desired heating performance will not be achieved. It may not be possible. Therefore, by decreasing the number of turns of the coils starting with the inner heating coil 5, in the case of a circular pot or the like, when it is placed at a position away from the center, the change in the inductance and resistance of the coil increases. It becomes possible to judge whether or not the heating is in a state of being placed on the position.

In addition, in the inner heating coil, the middle heating coil, and the outer heating coil this time, the single coil was described, but when it is a double coil on concentric circles with a gap, or when it is completely divided into multiple concentric circles A similar effect can be obtained in the case of using a split coil of .

(Embodiment 4)
3 and 4 show a top view and a sectional view of a heating coil unit according to a fourth embodiment of the present invention.

In FIG. 3, since the basic configuration is the same as that of the first embodiment, only the different configurations will be described.

A ferrite 9 and a ferrite 10 are arranged between the inner heating coil 5 , the middle heating coil 6 , the outer heating coil 7 of the heating coil unit 3 and the heating coil base 8 . Two ferrites 9 are arranged below the inner heating coil and on the innermost side of the inner heating coil so as to be parallel to the long sides of the middle heating coil. and all are arranged parallel to the long side of the external heating coil 7 . In addition, two wires are arranged at each corner, and they are arranged at regular intervals (for example, the ferrite interval is 14 mm).

Further, on the circumference of a circle 11 with a radius of about 110 mm centered on the center of the heating coil unit 3, the ferrite 10 is placed in a range 12 with a radius of about 73 mm from the center of the heating coil unit 3. It is placed in such a way that it cannot be entered. An insulating plate 13 made of mica is arranged between the heating coil and ferrite 9 and ferrite 10, and each is fixed with an adhesive. Ferrite 9 and ferrite 10 are fixed to heating coil base 8 with an adhesive.

The operation and effect of the main body configuration of the heating coil unit configured as described above will be described below.

The ferrite 9 arranged below the inner heating coil 5 is intended to assist the heating of the inner heating coil 5, and when a circular pot is placed on the heating coil unit 3, the inner heating coil is the most. It is placed in a position where it is most efficient.

Regarding the ferrite 10, by removing it from a point with a radius of 73 mm from the center of the heating coil unit 3, high frequency power was applied depending on whether the shape of the pot placed on the heating coil unit 3 was circular or other. The coils are arranged so that the difference in the inductance and the resistance value of the coil can be easily distinguished. This makes it easy to change the high-frequency power input depending on the type of pot.

In addition, by placing the center of the ferrite at a position on the circumference of a circle with a radius of 110 mm from the heating coil unit, in a circular pot larger than the inner heating coil 5, an ellipse, and a rectangular pot, It is possible to protect the heating of the outside of the pot, and it is possible to reduce variations in temperature distribution during heating.

Furthermore, in the grill pan 4 according to Embodiment 2, the temperature distribution tends to be poor at the corners of the grill pan 4 during heating. It is possible to obtain the effect of raising the temperature of the portion where the heat tends to come out, and to uniformly adjust the temperature distribution of the grill pan 4. - 特許庁

As a result, in the heating coil unit 3, even when various pots are placed, the temperature distribution can be kept uniform, and heating can be performed more efficiently.

(Embodiment 5)
FIG. 5 shows a schematic view of the heating coil unit according to Embodiment 5 as viewed from above.

In FIG. 5, since the basic configuration is the same as that of the first embodiment, only the differences in the configuration will be explained.

The intermediate heating coil 14 has a shape obtained by eliminating the curved shape of each side of the intermediate heating coil 6 . Further, the external heating coil 15 has a shape obtained by eliminating the curved shape of each side of the external heating coil 7 .

The operation and effect of the main body configuration of the heating coil unit configured as described above will be described below.

If each side of the middle heating coil 6 is not arched, but straight like the middle heating coil 14, the inter-coil distance from the inner heating coil 5 is 8 mm in the case of this coil. If the shape of the middle heating coil 6 draws an arc with a radius of 470 mm, the inter-coil distance between the inner heating coil 5 and the middle heating coil 6 is 11 mm. When the distance between the coils is short, the magnetic flux generated by the high-frequency power flowing through the two coils is concentrated, so that the concentrated magnetic flux points are heated more strongly during heating, resulting in variations in the temperature distribution of the object to be heated. . Also, if the distance between the apex of the middle heating coil 6 and the distance between the inner heating coil 5 is more than a certain distance, the distance between the coils becomes too large, and the coil between the inner heating coil 5 and the middle heating coil 6 becomes too large. The temperature distribution of the object to be heated varies in the gap. For this reason, by forming the above-described arched shape, the distance between the coils is secured at locations close to each other, and the distance is secured at locations that should not be separated, thereby reducing unevenness in the temperature distribution during heating.

In addition, if each side of the external heating coil 7 is not arched but straight like the external heating coil 15, the inter-coil distance between the internal heating coil 14 and the external heating coil 15 is 6 mm. By making each side of the coil curved like the heating coil 7, the distance between the coils can be made 12 mm. This makes it possible to reduce variations in temperature distribution due to concentration of magnetic flux. The inter-coil distance is an example, and may be changed according to the number of turns of each coil.

(Embodiment 6)
FIG. 6 shows a vertical cross-sectional view of the heating cooker according to Embodiment 6. As shown in FIG.

FIG. 7 shows a lateral cross-sectional view of the heating cooker according to Embodiment 6. As shown in FIG.

Furthermore, FIG. 8 is a schematic diagram showing the positional relationship between the heating coil unit and the bottom temperature sensor when the heating coil unit is attached according to the sixth embodiment.

A top surface 17 on which an object to be heated such as a pan is placed is arranged on the top surface of the main body 16 . In the present embodiment, an object to be heated such as a pot is heated by electromagnetic induction heating. Below the top surface 17, a top surface heating coil 18 that performs induction heating is provided in close proximity.

Here, the heating method for heating the object to be heated placed on the top surface 17 is not limited to the electromagnetic induction heating method.

High-frequency power is supplied to the top surface heating coil 18 by a power supply circuit (not shown). The main body 16 is provided with a heating chamber 19 having a substantially box-like shape and having a front opening and a bottom portion, and the opening is covered with a grill door 20 mounted so as to be freely movable in the front-rear direction. One end of an exhaust pipe 21 is connected to the rear portion of the heating chamber 19 for discharging smoke and the like generated in the heating chamber 19 to the outside of the main body 16 , and the other end of the exhaust pipe 21 is connected to the opening of the top surface 17 . A grill pan 4 on which a food 22 to be cooked is placed is housed in the heating chamber 19 connected thereto.

Above the heating chamber 19, a first heating means (hereinafter referred to as grill heating means 23) for heating the food 22 to be cooked from above is arranged so as to be close to the upper surface of the ceiling surface 24 of the heating chamber 19. attached to heat the food 22 by radiant heat.

In addition, the grill heating means 23 of the present embodiment is a heater in which a heater wire is wound around a mica plate and further sandwiched between mica plates at the top and bottom for insulation, but other heating means may be used and is not limited to this. not something.

Outside the heating chamber 19 and below the heating chamber 19, there is arranged a heating coil unit 3 that performs induction heating as a second heating means for heating the food 22 from below. A grill pan 4 detachably arranged in a heating chamber 19 is directly heated by separating a bottom part 25 of the heating chamber 19.例文帳に追加

The bottom portion 25 of the heating chamber 19 is similar to the insulating plate 1 shown in the first embodiment, and is made of crystallized glass, which is a material excellent in heat resistance, abrasion resistance, and cleaning properties. there is

In the present embodiment, the entire bottom portion 25 is made of crystallized glass, and the size of the bottom portion 25 made of the crystallized glass, which is a separate member, is at least the range facing the heating coil unit 3, that is, The heating coil unit 3 is set larger than the range projected vertically upward.
The heating coil unit 3 is arranged so that the long side of the heating chamber 19 and the long side of the heating coil unit 3 are parallel.

Further, the bottom surface portion 25 is supported by a support member 26, and fixed by sandwiching it between flanges 28 formed on the side surface portion 27 of the heating chamber 19 for fixing the position.

The side surface portion 27 is made of the same material as the ceiling surface 24 of the grill, and in the present embodiment, is made of a steel plate subjected to an enameling treatment.

Further, the support 26 of the present embodiment is the same as the support 2 of the first embodiment.
The grill plate 4 is alternately formed with grill plate protrusions 29 that form a placement surface in contact with the food 22 and grill plate recesses 30 that separate the fat generated from the food 22 .
The grill plate 4 is held by a grill plate supporting portion 32 provided on the grill door 20, and is constructed so that the grill plate 4 is always at the same position in the heating chamber 19 when the grill door 20 is closed. there is

The heating coil unit 3 is fixed so as to maintain a relative positional relationship with the bottom surface portion 25 and the grill pan 4 using the support 26 and the grill pan support portion 32 . The coil supporter 31 fixes the heating coil base 8 of the heating coil unit 3 and the supporter 26, and is made of resin having excellent heat resistance in order to maintain insulation between them.

An exhaust pipe temperature sensor 33 is attached to the exhaust pipe 21 in the vicinity of the heating chamber 19 for measuring the temperature of the food to be cooked in the heating chamber 19 from the air temperature at the measurement position.

A bottom temperature sensor 34 is provided in the central portion of the heating coil unit 3 in the heating coil unit 3 . Further, a bottom temperature sensor 35 is arranged in the center of the front side of the heating chamber 19 in the gap between the inner heating coil 5 and the middle heating coil 6 of the heating coil unit 3 . Both the bottom temperature sensor 34 and the bottom temperature sensor 35 are arranged so as to be in contact with the bottom portion 25, and are intended to measure the temperature of the heating chamber and the pan in the heating chamber 19 through the temperature of the bottom portion 25. there is The heating coil unit 3 is fixed so that the heating coil unit 3 is arranged in the center A of the heating chamber 19 in the left-right direction of the heating chamber 19. The center C of the heating coil unit 3 is arranged at a position of about 10 mm. Therefore, the bottom temperature sensor 34 arranged at the center of the heating coil unit 3 is arranged 10 mm behind the center of the heating chamber 19 in the depth direction. Also, the center of the heating chamber 19 is arranged between the bottom temperature sensor 34 and the bottom temperature sensor 35 .

Also, when the grill door 20 is closed, the bottom temperature sensor 34 and the grill plate projection 29 of the grill plate 4 are arranged vertically above the bottom temperature sensor 34 . Therefore, the bottom temperature sensor 34 measures the temperature of the grill pan 4 through the temperature of the air between the bottom part 25 and the grill pan 4 and the bottom part 25 .

With regard to the configuration of the induction heating cooker configured as described above, the operation and action thereof will be described below.

Refer to the first embodiment for the same contents as the first embodiment regarding the operation and effect.

By arranging the heating coil unit 3 in the heating chamber 19, the food 22 placed on the grill pan 4 in the heating chamber 19 can be heated from above and below as in the conventional example disclosed in Patent Document 1. By arranging the heating coil unit 3, it becomes possible to insert a pot or the like other than the grill pan 4 into the heating chamber 19 and heat it from above and below like the grill pan by the grill heating means 23 and the heating coil unit 3. .

The bottom temperature sensor 34 and the bottom temperature sensor 35 are provided for the purpose of measuring the temperature of the grill pan 4 and stopping heating when the temperature of the grill pan 4 rises abnormally. Since the grill pan 4 is supported by the grill pan support portion 32, the bottom temperature sensor 34 and the bottom temperature sensor 35 can always measure the same position, and the temperature rise of the grill pan reaches an abnormal temperature. If it does, the bottom temperature sensor senses it and stops the heating. However, this time, by providing the heating coil unit 3 in the heating chamber 19, it is necessary to use the bottom temperature sensor 34 and the bottom temperature sensor 35 to measure even when a pan other than the grill pan 4 is placed.

By arranging the bottom temperature sensor 34 about 10 mm behind the center of the heating chamber 19 and arranging the bottom temperature sensor 35 in front of the center of the heating chamber, when placed in the center of the heating chamber 19, the bottom temperature sensor 34 and the bottom temperature sensor 35 can measure the temperature of the pot when placed in the rear of the heating chamber, and when placed in the front of the heating chamber with the bottom temperature sensor 34, the bottom temperature sensor 35 can measure the temperature of the pot. Become. The distance shifted rearward from the center is an example, and may be changed according to the size of the heating chamber 19 .

When the pot is placed at the rear end of the heating chamber 19, the temperature rise of the exhaust pipe temperature sensor 33 provided in the exhaust pipe 21 behind the heating chamber 19 is higher than when the pot is placed in the center of the heating chamber 19. Since the temperature rises quickly, when the pan is placed in the rear of the heating chamber, it can be determined that the placement position of the pan differs from the actual use position and is abnormal. Therefore, in the present embodiment, when the temperature of the pan rises abnormally, it is not easy to determine the positional relationship between the bottom temperature sensors 34 and 35 with the exhaust stack temperature sensor 33. By arranging the temperature sensor 34 and the bottom temperature sensor 35, it is possible to measure the temperature rise regardless of where the pan is placed in the heating chamber 19. FIG.

The bottom surface of the pot placed in the heating chamber 19 is in surface contact with the bottom portion 25, and the bottom temperature sensors 34 and 35 measure the temperature of the pot via the temperature of the bottom portion 25. become. When measuring the temperature of the grill pan 4, there is an air layer between the grill pan 4 and the bottom part 25, but in the case of a pot, there is no air layer between them, so the temperature of the bottom temperature sensor 34 and the bottom temperature sensor 35 during heating is different rises. By using this, the bottom temperature sensor 34 and the bottom temperature sensor 35 can distinguish between the grill pan 4 and other pans.

(Embodiment 7)
FIG. 9 shows a schematic view of a heating coil unit showing an example in Embodiment 7 when viewed from above.

In the heating coil unit 3 at the bottom of the heating chamber 19 , bottom temperature sensors 36 are provided near four corners of the inner heating coil 6 between the inner heating coil 5 and the inner heating coil 6 . Each bottom temperature sensor 36 is configured to be installed with the bottom portion 25 .

With regard to the configuration of the induction heating cooker configured as described above, the operation and action thereof will be described below.

Refer to the first embodiment for the same contents as the first embodiment regarding the operation and effect.

The pot bottom diameter 37 of the pot is shown in FIG. The shape of the bottom of the pan indicates the minimum diameter of the pan that can be heated by the heating coil unit 3 in this embodiment. The minimum diameter of the pot is the effective range in the heating coil unit 3, which is the range in the heating chamber 19 in this embodiment, about 380 mm in the depth direction and about 270 mm in the width direction. The minimum diameter 37 of the pot that can be placed is set at 140 mm. The bottom temperature sensor 36 is provided so that at least one temperature sensor is positioned below the bottom of the pan regardless of the location of the mountable pan bottom diameter 37 within the current effective range. In this case, the width direction is about 90 mm, which is one-third of the total length, and the depth direction is also one-third of the total length, which is 125 mm. Between the heating coil 5 and the middle heating coil 6, by attaching four bottom temperature sensors 36 near the corners of the middle heating coil, no matter where the pot is placed on the bottom surface 25, It becomes possible to measure the bottom temperature of the pot. At the minimum diameter of the pot that can be heated, the effective range of the heating coil unit 3 is finely divided into vertical and horizontal ranges from the pot bottom diameter 37, and the bottom temperature sensor 36 is placed to measure the temperature of the bottom of the pot placed within the effective range. measurement becomes possible.

In this embodiment, the heating coil unit 3 is installed under the bottom surface of the heating chamber 19, but the same effect can be obtained by using the heating coil on the top surface.

This embodiment shows an example, and the positions and number of the bottom temperature sensors 36 arranged between the coils are not limited to this. When the diameter of the pan to be placed is increased, three bottom temperature sensors 36 are placed at the center of the heating coil unit 3 and at the midpoint between the middle heating coil 6 and the outer heating coil 7 in the width direction, When the minimum diameter of the pot to be placed is reduced, in addition to the example shown here, by additionally providing a bottom temperature sensor 36 between the middle heating coil 6 and the outer heating coil 7, it is possible to determine at which point the pot is placed. It is also possible to measure the bottom temperature of the pot.

As described above, the heating coil unit according to the present invention uses three types of heating coils to uniformly heat a circular pot to a large heating plate (a grill dish in the present invention). made it The configuration that realizes this can be used in general households and commercial kitchens, etc., and can be used for heating the top surface and grill heating of stationary and built-in heating cookers, as well as tabletop heating cookers and It can be applied to a wide range of cookers such as hot plates.

REFERENCE SIGNS LIST 1 insulating plate 2 support 3 heating coil unit 4 grill pan 5 inner heating coil 6 middle heating coil 7 outer heating coil 8 heating coil base 9 ferrite 10 ferrite 11 ferrite 10 mounting position 12 ferrite 10 placement prohibited range 13 insulating plate 14 middle heating Coil (no bow)
15 External heating coil (no bow)
16 Main body 17 Top surface 18 Top surface heating coil 19 Heating chamber 20 Grill door 21 Exhaust pipe 22 Food to be cooked 23 Grill heating means 24 Ceiling surface 25 Bottom surface 26 Support 27 Side surface 28 Flange 29 Grill plate protrusion 30 Grill plate recess 31 Coil support 32 Grill plate support 33 Exhaust stack temperature sensor 34 Bottom temperature sensor 35 Bottom temperature sensor 36 Bottom temperature sensor 37 Pan bottom diameter

Claims (9)

a box-shaped heating chamber having a front opening and a bottom;
A heat-resistant insulating plate forming the bottom portion of the heating chamber;
a support that supports the insulating plate;
an inner heating coil arranged below the insulating plate and formed in an annular shape including a central portion where no coil is arranged;
an intermediate heating coil formed on the outer periphery of the inner heating coil with a space therebetween;
A substantially rectangular outer heating coil provided at intervals on the outer periphery of the middle heating coil;
A first bottom provided so that the center of the inner heating coil is located behind the central portion of the heating chamber, and overlaps a portion of the inner heating coil where the coil is not arranged at the center in plan view. a temperature sensor;
a second bottom temperature sensor provided in front of the center of the heating chamber;
an exhaust pipe provided behind the heating chamber;
an exhaust stack temperature sensor provided in the exhaust stack;
Heating cooker with The second bottom temperature sensor is provided between the inner heating coil and the middle heating coil,
The heating cooker according to claim 1. A grill pan having a substantially rectangular outer periphery placed on the insulating plate,
3. The heating cooker according to claim 1, wherein an outer peripheral portion of said grill pan is positioned above said external heating coil. The grill plate has a grill plate protrusion that forms a placement surface in contact with the food,
4. The heating cooker according to claim 3, wherein said grill plate projection is arranged vertically above said first bottom temperature sensor. The heating cooker according to any one of claims 1 to 4, wherein the middle heating coil is substantially rectangular. 6. Any one of claims 1 to 5, wherein the middle heating coil has fewer coil turns than the inner heating coil, and the outer heating coil has fewer coil turns than the middle heating coil. The heating cooker described in . The heating cooker according to any one of claims 1 to 6, wherein the external heating coil is parallel to the long sides of the external heating coil and ferrite is arranged near four vertices of the external heating coil. The heating cooker according to any one of claims 1 to 7, wherein each side of the outer heating coil and the inner heating coil has a curved shape. the main body;
the heating chamber disposed within the main body;
The heating cooker according to any one of claims 1 to 8, comprising:

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