JP5795986B2 - rice cooker - Google Patents

Description

  The present invention relates to a rice cooker, which improves the heat insulation of an inner container of a main body that houses an inner pot and improves energy saving.

  In the conventional rice cooker aiming at improving this kind of energy saving, as shown in Patent Document 1, an electric rice cooker provided with a vacuum chamber with a double-structured vacuum inner container 7 that houses the inner pot. is there.

Japanese Utility Model Publication No. 05-88415

In recent years, in addition to the demand to eat delicious rice, interest in energy conservation has increased.
As shown in Patent Document 1 described above, the double-structured vacuum inner container 7 having the vacuum chamber 43 has a flange-shaped joint portion 61 that protrudes outward in order to join the inner unit 41 and the outer unit 42. Necessary.

  Therefore, in order to store the flange-shaped joint portion 61 protruding outward in the main body, there is a problem of making the outer shape of the rice cooker body 1 large, and the raw material for making the outer shape of the rice cooker main body 1 large There is a problem of using a lot.

In order to solve the above-described conventional problems, according to a first aspect of the present invention, a main body, a main body inner wall provided inside the main body, an inner hook upper side surface, an inner hook lower side, and an inner pot bottom that are housed in the main body inner wall. an inner rotary hook made of the heating coil for induction heating the internal pot bottom is provided below the main body inner wall, and a control unit for supplying power to the heating coil, further,
A substantially cylinder having an upper opening and a lower opening, forming a vacuum layer between the inner cylinder and the outer cylinder, covering the lower portion of the inner pot from the inner pot bottom to the height of rice having the maximum rice cooking capacity. A vacuum vessel , a bottom vessel provided on the inside of the vacuum vessel , the outer circumference or the lower surface of which is substantially in close contact with the bottom of the vacuum vessel, and a cooling fan for cooling the heating coil are provided. The cooling air does not enter the inside of the inner wall of the main body .

According to a second aspect of the present invention, the heating coil is provided inside the lower opening of the vacuum vessel.

  According to the present invention, heat dissipation to the outside of the main body can be suppressed without increasing the outer shape of the main body, and power consumption can be suppressed without wasteful heating.

It is sectional drawing of the rice cooker which concerns on one Example. It is side surface heater expansion | deployment sectional drawing of one Example. It is an expanded sectional view of the vacuum container and shield means of one example. It is explanatory block diagram of the control system of the rice cooker of one Example. It is an operation | movement figure of the rice cooker of one Example. It is the A section enlarged explanatory view of FIG.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
In the cross-sectional view of the rice cooker in FIG. 1, reference numeral 1 denotes a main body of the rice cooker, which includes an inner pot 2 that is detachably stored in the main body 1.

  The inner hook 2 is formed with an inclined portion 2f at the lower portion 2c of the inner hook so that the diameter of the upper opening 2e becomes the maximum diameter and the diameter becomes smaller toward the inner hook bottom 2a. Further, the entire periphery of the upper opening 2e is provided with a flange portion 2d, and is placed on the inner hook mounting portion 1b raised from 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. The

  Reference numeral 40 denotes a main body inner wall portion that houses the inner hook 2 in the main body 1, and a portion facing the inner hook lower portion 2 c of the inner hook 2 is formed by a vacuum inner container 7 so as to cover substantially the lower half of the inner hook 2. A portion facing the inner hook upper side surface 2b is formed by a side frame 21 so as to cover substantially the upper half of the inner hook 2.

  The main body 1 includes an outer lid 3 that covers the upper portion of the main body 1, and the outer lid 3 is attached to the inside, covers the upper opening 2 e of the inner hook 2, and keeps the inside of the inner hook 2 in a substantially sealed state. 4 is provided at the top of the main body 1 so as to be openable and closable.

  The main body 1 includes an outer lid 3 that covers the upper portion of the main body 1, is attached to the inner side of the outer lid 3, covers the upper opening 2 e of the inner hook 2, and an inner lid 4 that keeps the inner pot 2 in a substantially sealed state The cover body 31 comprised by this is provided in the upper part of the main body 1 so that opening and closing is possible.

  A flat lid heater 30 for heating the inner lid 4 is provided on the lower surface of the outer lid 3 inside the lid 31. The lid heater 30 is used to prevent dew condensation by heating the upper portion of the inner hook 2 and the inner lid 4 when keeping warm.

  The vacuum inner container 7 is substantially cylindrical, and as shown in FIG. 3, a vacuum two-layer structure of an inner cylinder 13 and an outer cylinder 14 forms a vacuum layer 7h inside, and an upper upper end surface 15 and a lower part are formed. The inner cylinder 13 and the outer cylinder 14 are welded at the lower end surface 16. The upper end surface 15 is provided so as to protrude substantially horizontally outside the outer diameter of the outer cylinder 14. Further, the lower end surface 16 is provided so as to protrude downward substantially vertically.

  The inside of the upper end surface 15 and the lower end surface 16 has an upper opening 7f and a lower opening 7g having a smaller diameter than the upper opening 7f, respectively, and a ring-shaped bottom 13a in a substantially horizontal direction inside the lower opening 7g. It has.

  Further, the vacuum inner container 7 is provided so as to cover only the side of the inner hook lower part 2c which is smaller than the maximum diameter of the upper opening 2e of the inner hook 2 so as to protrude to the outer peripheral side which becomes the maximum diameter of the vacuum inner container 7. The outer diameter of the end face 15 is reduced. The outer diameter of the upper end surface 15 is smaller than the case where it is provided so as to cover the upper opening 2e which is the maximum diameter of the upper part of the inner pot 2 with the vacuum inner container 7, and it is effective for downsizing of the main body 1 for storing the vacuum inner container 7 It is. In addition, the range in which the vacuum inner container 7 covers the inner pot 2 is the maximum cooking rice capacity (for example, 5.5 in the case of 5.5 combined type) in the inner pot bottom 2a and the inner pot 2 to be heated. The range covers up to the height of the entry. The reason is that the heat of the inner pot 2 heated by the bottom heating means 5 described later at the time of rice cooking can efficiently heat the rice and water that require a heat source, so that heat is released from the heated rice and water. It arranges so that it may reduce.

  Moreover, the dent part 7a is provided in the inner side edge part of the upper end surface 15 of the vacuum container 7, and the side surface frame 21 mentioned later is fitted in the dent part 7a. The surface where the vacuum inner container 7 and the side surface frame 21 are joined is bent by the indented portion 7a, and the area to be joined is increased, so that warm air from the inner side 8c does not leak to the outer side 8d. Further, cooling air described later is prevented from entering the inner side 8c.

  The side frame 21 has a substantially cylindrical shape, and as shown in FIG. 2, the heater wire is wound tightly around the outside of the stainless steel metal frame 8 having a substantially U-shaped cross section with the opening facing outward. An upper heating means 6 is provided, and further a metal frame 8 and a resin frame 9 covering the outer periphery of the upper heating means 6 are provided, and a space layer 10 (FIG. 1) is provided in a space portion between the metal frame 8 and the resin frame 9. Composed.

  The resin frame 9 includes an upper resin frame 11 and a lower resin frame 12, and the upper end 8a and the lower end 8b of the metal frame 8 are sandwiched between the respective sandwiching portions 11a and 12a of the upper resin frame 11 and the lower resin frame 12, and the upper The side surfaces 11 b and 12 b of the resin frame 11 and the lower resin frame 12 overlap to constitute a space layer 10 sealed inside the side frame 21. By providing the side portions 11b of the upper resin frame 11 outside the side portions 12b of the lower resin frame 12, the air in the space layer 10 is further difficult to escape to the outside. Therefore, the part facing the inner hook upper side surface 2b by the side frame body 21 also has high heat insulation.

  The inner wall 40 of the main body formed by the vacuum inner container 7 and the side frame 21 is formed on the recessed portion 7a of the upper end surface 15 of the vacuum inner container 7 dropped into the main body 1 so that the lower resin frame 12 of the side frame 21 is formed. The receiving portion 12c is placed and supported by bringing the lower side of the upper frame 1a of the main body 1 into contact with the receiving portion 11c of the upper resin frame 11 of the side frame 21. Therefore, by joining the upper end surface 15 of the vacuum inner container 7 and the receiving portion 12c of the side frame 21, the heat of the inner pot 2 from this joined portion is transferred from the inner side 8c of the main body inner wall portion 40 to the outer side 8d, that is, the air path of the main body 1. It cannot be leaked to 1c.

  Reference numeral 5 denotes a bottom heating means, which is composed of a heating coil around which a litz wire is wound to inductively heat the inner pot 2.

  A dish-shaped bottom container 48 is provided in the lower part inside the vacuum container 7. The outer periphery or lower surface of the bottom vessel 48 is in close contact with the bottom 13a of the vacuum inner vessel 7 so that air from the air passage 1c formed on the outer side 8d of the inner vacuum vessel 7 does not flow into the inner side 8c. The bottom surface of the bottom container 48 is provided with a bottom heating means 5 for heating the bottom of the inner pot 2 and a temperature sensor 19 for detecting the temperature of the rice by detecting the temperature of the bottom of the inner pot 2.

  Numeral 17 is a shield means made of metal such as aluminum that does not undergo electromagnetic induction heating, and the bottom heating means 5 is heated by electromagnetic induction heating in the vicinity of the lower end surface 16 that is a welded portion of the vacuum inner container 7 adjacent to the bottom heating means 5. Prevent and protect. Further, the flange portion 17a of the shield means 17 is placed on the bottom portion 13a of the vacuum inner container 7, the hanging portion 17b is disposed inside the lower end surface 16, and the bottom portion heating means 5 is provided further inside thereof, and the bottom portion heating means. The magnetic induction magnetic flux generated when the inner pot 2 is heated by 5 does not act on the inner cylinder 13 and the lower end surface 16.

  The main body 1 includes a control unit 50 that is a control unit that controls electric power supplied to the upper heating unit 6, the lid heater 30, and the bottom heating unit 5 based on information from the temperature sensor 19.

  A bottom heating means 5 disposed on the bottom surface of the bottom vessel 48 and a cooling fan 18 for cooling the control unit 50 are provided on the front side of the main body 1, and the air that has been sucked from the intake port 49 a and cooled the bottom heating means 5 passes through the air passage 1 c. Exhaust from the exhaust port 49 on the rear side of the main body 1.

  On the front side of the main body 1, an operation unit 38 that operates the operation and a display unit 32 that displays the state are provided, connected to the control unit 50.

A block diagram of the control system will be described with reference to FIG.
The conditions input to the control unit 50 include a temperature sensor 19 that is a temperature detection unit that detects the temperature of the inner pot 2 and inputs temperature information, and an operation unit 38 that includes various setting buttons.

  Further, what is controlled by the control unit 50 in response to the input includes a bottom heating unit 5, an upper heating unit 6, a lid heater 30, a cooling fan 18, and a display unit 32.

  Note that the control unit 50 is an electronic control unit mainly composed of a microcomputer, and an application for executing various control functions by software is given to the control unit 50.

Next, the operation of the above configuration will be described.
FIG. 5 shows a case where the rice cooking operation and the heat retaining operation are executed.
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 lid 31.

Next, the “ON” switch of the operation unit 38 arranged at the upper part on the front side of the main body 1 is operated to start cooking rice.

  When the signal of the “ON” switch is input to the control unit 50, the dipping process is started. In this soaking process, water is sucked into the rice, the bottom heating means 5 and the upper heating means 6 are energized with a small electric power to heat them, and the cooling fan 18 operates.

  Normally, rice absorbs moisture up to about 30% (ratio of water weight in the weight of rice) by soaking in water at a water temperature of 60 ° C. or lower due to its characteristics. . The reason why rice is generally sharpened and soaked in water is to allow the rice to absorb water up to 30% before cooking. Rice has the property of absorbing water faster at higher water temperatures. The time of the immersion process performed by heating to about 40 ° C. to 60 ° C. is about 15 minutes.

  In this dipping process, the wind is flowing in the air passage 1c, but the inner pot 2 is heated without the heat of the inner pot 2 escaping to the outside 8d of the vacuum inner container 7 and the side frame 21.

  When heating is not performed in this soaking process, the same water absorption can be achieved by extending the time slightly in order to achieve the same water absorption as when the water temperature is low and the water temperature is high. Can inhale water. It is about 20 minutes longer than when heated. Thereby, electric energy can be reduced.

  Next, when the dipping process is completed, the heating process is started. In this heating step, the bottom heating means 5 is energized to heat the inner pot bottom 2a of the inner pot 2, and at the same time, the cooling fan 18 is operated to cool the bottom heating means 5. Further, the upper heating means 6 and the lid heater 30 are not heated.

  When the bottom heating means 5 is energized, a high frequency magnetic field is generated. When this magnetic field passes through the inner hook 2, an eddy current is generated in the inner hook 2, which is converted into Joule heat by the electric resistance of the inner hook 2, and generates heat. To do. And by this heat_generation | fever, the inner pot 2 is heated to 100 degreeC and the water of the inner pot 2 boils. Eventually, when the rice sucks water and runs out of water, and the temperature of the inner pot 2 suddenly rises to 110 ° C., the temperature sensor 19 in contact with the inner pot bottom 2a of the inner pot 2 detects the temperature and controls the controller 50. As a result, the energization to the bottom heating means 5 is stopped and the heating is finished. This heating step is about 10 minutes.

  In this heating step, the wind flows through the air passage 1c, but the cooling air does not enter the inner side 8c through the main body inner wall portion 40. Moreover, the heat of the inner side 8c and the heated inner pot 2 does not escape from the main body inner wall 40, and rice can be cooked very efficiently.

  In particular, it is possible to efficiently heat the object to be heated by covering the range of the object to be heated with rice and water with the vacuum inner container 7.

When this heating process is completed, the process proceeds to a steaming process. In the steaming step, the bottom heating means 5, the upper heating means 6 and the lid heater 30 are energized to maintain the temperature of the inner pot 2 at 100 ° C. The dew on the inner lid 4 during steaming is heated by the lid heater 30 so that the dew can be removed.

  The time of the steaming process is about 20 minutes, and the upper heating means 6 and the lid heater 30 make the heating time longer than the time when the heating is stopped. This makes it possible to cook delicious rice with plump gloss.

  In this steaming step, the wind is flowing in the air passage 1c, but the inner pot 2 is heated without the heat of the inner pot 2 escaping to the outside 8d of the vacuum inner container 7 and the side frame 21.

  At the time of heat insulation, the control part 50 changes the heat insulation temperature with time, heats it with the bottom part heating means 5 and the upper part heating means 6, and blows away the dew on the inner lid 4 with the lid heater 30 to keep the temperature. At the time of heat insulation, the cooling fan 18 does not operate because the bottom heating means 5 is low in power and does not require cooling.

  At the time of this heat retention, the inner pot 2 is heated without the heat of the inner pot 2 escaping to the vacuum inner container 7 and the outer side 8d of the side frame 21.

  With the above operation, heat dissipation in the inner pot 2 is suppressed, steamed at a high temperature to finish it into delicious rice, and it can be kept warm without wasting by suppressing heat dissipation even during heat retention. While reducing the drying and deterioration of the rice by heating, energy saving property can be improved.

  As described above, in this embodiment, the heat dissipation to the outside of the main body 1 can be suppressed without increasing the outer shape of the main body 1, and the power consumption can be suppressed without unnecessary heating.

DESCRIPTION OF SYMBOLS 1 Main body 2 Inner hook 2a Inner hook bottom part 2b Inner hook upper side surface 2c Inner hook lower part 2e Upper opening 3 Outer lid 4 Inner lid 5 Bottom heating means 6 Upper heating means 7 Vacuum inner container 8 Metal frame 8a Upper end part 8b Lower end part 9 Resin Frame 10 Spatial layer 11 Upper resin frame 11a, 12a Nipping part 11b, 12b Side face part 12 Lower resin frame 13 Inner cylinder 14 Outer cylinder 15 Upper end face 16 Lower end face 17 Shielding means 18 Cooling fan 21 Side frame body 40 Body wall part

Claims (2)

A main body, a main body inner wall provided inside the main body, an inner hook that is housed in the main body inner wall and includes an upper side of the inner hook, a lower side of the inner hook, and an inner bottom of the inner hook, and the inner wall provided below the inner wall of the main body. a heating coil for induction heating of the pot bottom, and a control unit for supplying power to the heating coil, further,
A substantially cylinder having an upper opening and a lower opening, forming a vacuum layer between the inner cylinder and the outer cylinder, covering the lower portion of the inner pot from the inner pot bottom to the height of rice having the maximum rice cooking capacity. A vacuum vessel ,
A bottom container provided inside the vacuum container, the outer periphery or the lower surface of which is in close contact with the bottom of the vacuum container;
A cooling fan for cooling the heating coil,
Cooling air from the cooling fan does not enter the inside of the inner wall of the main body . The rice cooker of Claim 1 WHEREIN: The said heating coil was provided inside the lower opening part of the said vacuum vessel, The rice cooker characterized by the above-mentioned.