JP2016202343A - rice cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inner pot capable of facilitating a user's handling and controlling a convection current of water in rice cooking while facilitating its manufacturing.SOLUTION: A rice cooker includes a body 1, an inner pot 2 provided inside the body 1 detachably and having a heating part desired to be heated, a heating coil 4 provided at a position facing the bottom part 2f of the inner pot 2 for inductively heating the heating part, and an outer lid 5 for blocking the body 1 and an upper surface opening of the inner pot 2. A base material 2c which is an alloy material of aluminum and magnesium is used for the inner pot 2. A thin wall part 2m is provided at the border between the heating part heated by the heating coil 4 and a non-heating part that is not heated by the heating coil 4.SELECTED DRAWING: Figure 1

Description

    The present invention relates to a rice cooker with optimized heat conduction in an inner pot.

  When the inner pot shown in Patent Document 1 compares the thickness of the side upper part and the bottom side, the thickness of the side upper part is increased, and the heat capacity of the side upper part is increased from the bottom side. Water boiling occurs from the inner pot, and as a result, the convection of water first occurs ascending convection on the center side. By doing so, it is publicly disclosed that the heat is made uniform and the cooked rice having a uniform hardness and grain size can be obtained.

JP-A-2015-330

  In patent document 1 mentioned above, since the thick part above the side surface of an inner hook is manufactured by increasing the amount of thermal spraying of iron, there is a problem that a lot of manufacturing time is required.

  The present invention has been made in order to solve the above-described problems, and is provided with a main body, an inner hook that is detachably provided in the main body and has a heat generating portion that is desired to be heated, and a position that faces the bottom of the inner hook. A heating coil for inductively heating the heat generating portion, and an outer lid for closing the main body and the upper surface opening of the inner hook. The inner hook is provided with a base material made of an alloy material of aluminum and magnesium. A thin-walled portion is provided at the boundary between the heat generating portion used and heated by the heating coil and the non-heat generating portion not heated by the heating coil.

  ADVANTAGE OF THE INVENTION According to this invention, while making manufacture easy, a user's handling is also made easy and it can be set as the inner pot which can control the convection of the water at the time of rice cooking.

It is sectional drawing of the rice cooker which concerns on one Example. It is an external view of the inner pot. It is an expanded sectional view of the level | step-difference part of the same inner hook. It is an expanded sectional view of the level | step-difference part explaining the thermal spraying process of the inner pot.

  An embodiment of the present invention will be described below with reference to FIGS.

  1 and 2, reference numeral 1 denotes a main body of a rice cooker. A protective frame 3 having an upper surface is provided inside the main body 1 of the rice cooker, and an inner pot 2 is detachably stored in the protective frame 3. Has been.

  The inner hook 2 has a cylindrical shape with a top opening and has a diameter that decreases toward the bottom 2f. A flange portion 2b is provided on the entire circumference of the upper opening, and is placed on the upper frame 1a of the main body 1 so that the position of the inner hook 2 is fixed and held on the main body 1.

  A heating coil 4 for induction heating the inner pot 2 is provided on the outer bottom surface of the protective frame 3. The heating coil 4 is formed by winding an electric wire more than ten times, and has a substantially planar ring shape having an inner diameter of φ80 mm and an outer diameter of φ160 mm, for example, and there is no electric wire in the center. The most heat is generated within the position.

  The main body 1 includes an outer lid 5 that covers the upper portion of the main body 1, and the outer lid 5 is attached to the inside, covers the upper opening of the inner hook 2, and keeps the inside of the inner hook 2 in a substantially sealed state. The outer lid 5 is provided on the main body 1 so as to be openable and closable.

  The main body 1 is provided with a control unit 7 and heats a portion of the inner pot 2 that is substantially opposed to the heating coil 4 by electromagnetic induction heating by flowing a high-frequency current through the heating coil 4 in a controlled manner.

The control unit 7 is provided with an operation unit 7a and a display unit 7b. When the user operates the operation unit 7a while looking at the display unit 7b, an operation such as rice cooking is executed.

  The inner hook 2 will be described in detail with reference to FIGS.

  The inner pot 2 uses an alloy material in which magnesium is mainly added to aluminum as the base material 2c. For example, the base material 2c which is the aluminum alloy material is configured with a plate thickness of 2.5 mm. First, the base material 2c is formed by pressing into the shape of the inner hook 2.

  The inner hook 2 is provided with a concave portion 2e having a circular lower shape and a convex shape on the inner side (upper side). The concave portion facilitates convection in the inner hook 2. The bottom 2f including the recess 2e faces the heating coil 4. A corner portion 2a rising above the bottom portion 2f, a side surface portion 2h rising above the corner portion 2a, and a flange portion 2b are provided above the side surface portion 2h.

  The base material 2c of the inner pot 2 uses an alloy material in which magnesium is mainly added to aluminum. For this reason, the heat conduction is equivalent to that of the aluminum base material, but it is light and easy to handle, and the material is hard and hardly damaged. Also, by performing thermal spraying of iron on the bottom, which will be described later, the heat generation efficiency in induction heating becomes as high as about 84%.

  The inner pot 2 is provided with a stepped portion 2g by performing a cutting process with a press machine and then performing a cutting process having a ring shape on the outer side of the corner portion 2a and a hook shape in cross section. The stepped portion 2g includes a substantially vertical surface 2p and a substantially horizontal surface 2n, and the thin portion 2m may be shaped in the inner pot 2 as a configuration. Therefore, the shape of the stepped portion 2g is not limited to the shape shown in FIG. Even if it is V-shaped, it is not necessary to comprise two sides, and it may comprise a plurality of sides. Further, in addition to cutting, shaping may be performed using, for example, casting or a mold.

  The step 2g shown in FIG. 3 forms an annular step 2g by cutting the corner 2a from the bottom 2f or 2b flange with a cutter at a certain height.

  The position where the thin portion 2m is provided is provided at the boundary between the sprayed portion 2d (heat generating portion) that generates heat in induction heating and the non-sprayed portion (non-heat generating portion).

  Moreover, the thin part 2m is about 2/3 of the thickness of the base material 2c.

  Next, the spraying process will be described as shown in FIG.

  Iron is sprayed from the bottom 2f side using a mask jig G having a circular hole that fits into the annular step 2g in the step 2g of the thin portion 2m of the inner pot 2. The mask jig is produced according to the shape of the stepped portion 2g, and depending on the shape of the stepped portion 2m, it is necessary to make the mask jig with an elastic member. The thickness of the thermal spraying part which is this heat generating layer is 0.5 mm. Thereafter, ALSi is sprayed to a thickness of 0.1 mm as a rust prevention layer, and a silicon heat resistant coating is applied to the outer surface.

  The thermal spraying of iron is performed on the heat generating portion inside the stepped portion 2m described above. Therefore, the stepped portion 2m is not sprayed by the mask jig G. Therefore, when the mask jig G is removed, a boundary portion 2k between the sprayed sprayed portion 2d and the stepped portion 2g which is a portion not sprayed is provided.

  The iron spray 2d on the outside of the inner pot 2 is formed by spraying iron fine particles melted by electric discharge at high speed onto the base material, and joining the base material with the thermal energy and kinetic energy of the iron fine particles. It is a manufacturing method in which layers are stacked.

  The heat generating part is not particularly limited to the thermal spraying of iron, and may be formed by being heated by induction heating.

  Next, the operation of the above configuration will be described with reference to FIG.

  When cooking rice, the user puts rice and an appropriate amount of water into the inner pot 2, accommodates them in the main body 1, and closes the outer lid 5. The inner lid 6 is in contact with the flange portion 2b of the inner hook 2 so that the air tightness inside the inner hook 2 is maintained.

  Next, the display of the display part 7b is confirmed, the operation part 7a is operated, and rice cooking is started.

  When the said operation is input into the control part 7, rice cooking will start and it will enter a soaking process. The heating coil 4 is energized intermittently, the inside of the inner pot 2 is kept at about 50 ° C., and water is efficiently sucked into the rice. Since the dipping process requires less heating for an execution time of about 15 minutes, at the end, both the inside of the inner pot 2 and each part of the inner pot 2 are in a state of approximately 50 ° C.

  Next, when the dipping process is completed, the heating process is started. In the heating process, the first half of the heating process is heated until boiling starts in about 5 to 10 minutes, and the amount of heating is reduced so that it does not spill after boiling, and the boiling state is continued for about 5 minutes until the rice disappears by sucking water. Consisting of the latter half of the heating process.

  In the first half of the heating process, the heating coil 4 is energized to heat the inner pot 2 with high power. The thermal spraying part 2d provided facing the heating coil 4 of the inner pot 2 generates heat by electromagnetic induction heating.

  Therefore, the temperature of the sprayed portion 2d starts to rise, and when the temperature increases, heat starts to be conducted toward the lower temperature. However, since the thermal resistance of the thin-walled portion 2m provided at the boundary of the sprayed portion 2d is high, the heat of the sprayed portion 2d that is efficiently heated is transferred to the water in the inner pot 2. Since the sprayed portion 2d extends from the bottom portion 2f of the inner pot 2 to near the substantially side surface portion 2h of the corner portion 2a, the water put in the inner pot 2 is heated almost uniformly on the bottom surface 2f side. The temperature rise to the part 2h is controlled by the thin part 2m. For this reason, convection that rises in the center portion is vigorously generated at the initial stage of boiling of water, and convection in which water rises also on the side surface portion 2h side with a rise in temperature of the side surface portion 2h.

  First, the convection of water is created in the center, and the passage of the heated water is created, thereby eliminating uneven heating.

  When there is no water in the inner pot 2, the control unit 7 stops the heating process and shifts to the steaming process. In the steaming step, the heating coil 4 is intermittently energized so as to sufficiently maintain the temperature at 100 ° C., thereby preventing the temperature from decreasing.

According to the above-described embodiment, the inner pot 2 can be handled by making it easy to handle by reducing the size of the 5.5-cooked size to about 750 g or less, and making the heat conduction harder while being equivalent to aluminum. It makes it hard to get scratches at the time and improves heat generation efficiency. Furthermore, even with only the heating coil 2 provided on the bottom 2f side of the inner pot 2, by providing the inner pot 2 with a thin portion 2m, the convection of water during cooking can be controlled, so that the heat in the inner pot is made uniform. , Cooked rice with uniform hardness and grain size can be obtained.

DESCRIPTION OF SYMBOLS 1 Main body 1a Upper frame 2 Inner hook 2a Corner | angular part 2b Flange part 2c Base material 2d Thermal spray part 2f Bottom part 2g Step part 2k Boundary part 2h Side part 3 Protection frame 4 Heating coil 5 Outer cover 6 Inner cover 7 Control part 7a Operation part 7b Display section

Claims (2)

The body,
An inner pot that is detachably provided inside the main body and has a heat generating part located at the bottom, a non-heat generating part located on a side surface, and a thin part located at a boundary between the heat generating part and the non-heat generating part;
A heating coil that is provided at a position facing the bottom of the inner pot and that inductively heats the heat generating part;
A lid for closing the upper surface opening of the main body and the inner hook;
A rice cooker characterized by comprising: The body,
An inner pot having a heat generating part that is detachably provided inside the main body,
A heating coil provided at a position facing the bottom of the inner pot for inductively heating the heat generating part;
An outer lid that closes the upper surface opening of the main body and the inner hook;
In the inner pot,
Using a base material that is an alloy material of aluminum and magnesium,
A rice cooker characterized in that a thin portion is provided at a boundary between a heat generating portion heated by the heating coil and a non-heat generating portion not heated by the heating coil.

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