JP3479178B2 - rice cooker - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating type rice cooker provided with a control means cooling means. 2. Description of the Related Art In order to cook delicious rice, a strong heat is required. As a method for efficiently heating with high power, there is an induction heating type rice cooker. The control unit, which has an inverter control means for supplying current, is composed of power components such as switching elements.Electric components and coils of the control unit are controlled by self-heating of the power components and the effect of radiant heat from the inner kettle to supply a large current during cooking Because there was a possibility that the temperature would become higher than the allowable temperature, a cooling means for cooling the control unit was provided. As a conventional induction heating type rice cooker provided with a cooling means of a control unit, for example, as shown in Japanese Patent Application Laid-Open No. 1-276585, a coil for induction heating and an inverter for supplying a high-frequency current to this coil Japanese Patent Application Laid-Open No. Hei 7-28941, including a control unit having control means and a cooling fan, wherein the cooling fan is rotated during rice cooking to cool the control unit.
As disclosed in Japanese Patent Application Publication No. 9-206, a coil for induction heating, a control unit having an inverter control means for supplying a high-frequency current to the coil, a cooling fan for cooling power components such as a coil and a switching element of the control unit, and a temperature detector There is known a device having means for increasing the number of revolutions of a cooling fan when the temperature of a switching element becomes higher than a predetermined value during cooking rice. [0004] In the prior art, in order to drive the inverter control means for a long time during the rice cooking process, the cooling fan is also driven and cooled during the rice cooking. Since the fan is stopped, even if the rice is cooked and the operation is shifted to the warming, and the rice is sufficiently loosened, the temperature of the rice does not drop easily, and it takes time to reach the optimal temperature for the warming. In addition, there is a problem that rice may be deteriorated due to promotion of water evaporation. SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has an inner pot housed in a main body and an induction heating coil for heating the inner pot. A heating unit including a heater and a heater, an inner pot temperature detecting unit that detects the temperature of the inner pot, and a control unit that controls energization of the heating unit in accordance with the rice cooking mode according to the temperature information from the inner pot temperature detecting unit.
In a rice cooker provided with a cooling fan for cooling the control unit,
The control unit drives the cooling fan until the temperature information from the internal pot temperature detecting means even when insulation has a predetermined insulation suitable temperature suitable for heat insulation cools the drive control unit of the cooling fan in the cooking, the internal body It was to be cooled . With the above construction, the control unit heats the inner pot in the rice cooking process with strong heating power by a heating means including an induction heating coil and a heater to remove rice and water in the inner pot. At this time, the cooling fan is driven at all times to cool the control unit, and the cooling fan is driven until the temperature reaches the appropriate temperature in the heat retaining process by the temperature information from the inner pot temperature detecting means .
By lowering the ambient temperature inside the chamber,
As soon as possible to cool the lower rice to warm a suitable temperature. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view of a rice cooker showing one embodiment of the present invention, and FIG. 2 is a control block diagram similarly. In the figure, reference numeral 1 denotes a main body of a rice cooker, and an inner pot 2 made of a magnetic material (for example, a clad material of aluminum and stainless steel or a casting) for cooking rice by putting water and rice in the main body 1.
A resin inner container 3 for accommodating therein is mounted, a body heater 4 made of silicone rubber is provided on the side surface of the inner container 3, a coil 5 for induction heating is provided on a bottom surface of the inner container 3, and an inner pot 2 of the coil 5 is provided. On the opposite side, a ferrite 6 that enhances magnetic shielding and inductive coupling is attached. The bottom of the inner pot 2 is provided with a thermo 7 in contact with a spring. Inside the thermo 7, an inner pot temperature detecting means 7a composed of a thermistor and a temperature fuse 7b for shutting off the circuit at an abnormal temperature are incorporated. Reference numeral 8 denotes a lid covering the main body 1, which is rotatably fixed to the hinge of the upper frame of the main body 1. Reference numeral 9 denotes an inner frame that covers the lower surface of the lid 8. The inner frame 9 includes a lid heater 10 made of silicone rubber, a radiator plate 11 for diffusing heat from the lid heater 10, and a packing 12 for preventing steam from leaking into the main body 1. It is provided and fixed by a hook button 13 on the side of the upper frame of the main body 1 facing the hinge so as to close the lid 8. Reference numeral 14 denotes a control unit provided in the main body 1; a control means 14a for controlling the entire rice cooker; a temperature judgment means 14b for judging a temperature based on temperature information from the inner pot temperature detection means 7a; And a warming heater energizing means 14c for controlling energization of the lid heater 10, an inverter controlling means 14d for applying a high-frequency current to the coil 5, and a cooling fan driving means 14 for driving a cooling fan 15 to be described later.
e. The cooling fan 15 is provided in the main body 1 and cools the control unit 14 and the inside of the main body 1. A configuration in which a propeller fan is attached to a motor or a configuration in which an axial flow fan is integrated with the motor are also conceivable. Next, the operation of the embodiment constructed as described above will be described. Put the washed rice and water in the inner pot 2 and put the inner container 3
When the rice cooker is operated from an operation panel (not shown), the inner pot temperature detecting means 7a is closed.
Is transmitted to the control means 14a after being judged by the temperature judgment means 14b, and the energization control of the body heater 4 and the lid heater 10 is performed by the warming heater energization means 14c, and is applied to the coil 5 by the inverter control means 14d. It controls the energization of high-frequency current and cooks rice according to the rice cooking menu and the rice cooking mode according to the cooking software. During the rice cooking operation, the cooling fan 15 is
e and continues to rotate, and the inverter control means 14
Not only the control unit 14 which generates heat by the energization of d, but also the inside of the main body 1 around the coil 5 is cooled. When the rice cooking is completed, the process automatically shifts to the warming step. At this time, the lid 8 is opened, the rice is loosened with a scoop to remove excess water and steamed, and then the lid 8 is closed again to keep it warm. During the heat keeping process, the electric power of the coil 5, the body heater 4, and the lid heater 10 is controlled so that the temperature information from the inner pot temperature detecting means 7a becomes an appropriate temperature (for example, about 72 ° C.). At this time, by driving the cooling fan 15 by the cooling fan driving means 14e until the heat retaining temperature becomes an appropriate temperature, the ambient temperature inside the main body 1 is lowered,
The rice is cooled down to the inner pot 2 and the temperature of the rice can be quickly lowered to a temperature suitable for keeping the rice warm. This prevents the water from evaporating too much or yellowing due to the high temperature of the rice while keeping it warm. As examples of the driving method of the cooling fan 15, intermittent rotation by turning on and off in consideration of the life and noise of the motor and rotation by periodic control of the duty ratio are also conceivable. The rice cooker according to the present invention has an inner pot housed in a main body, heating means including an induction heating coil and a heater for heating the inner pot, and detects the temperature of the inner pot. Inner pot temperature detecting means, and a control unit for controlling the energization of the heating means according to the rice cooking mode by the temperature information from the inner pot temperature detecting means,
In a rice cooker provided with a cooling fan for cooling the control unit,
The control unit drives the cooling fan during rice cooking to cool the control unit, and at the time of keeping the temperature, the cooling fan is driven until the temperature information from the inner pot temperature detecting means reaches a predetermined temperature suitable for keeping the temperature. Not only cools the control section that generates heat when energized, but also cools the inside of the main body around the coil,
Even during the heat retention, the temperature of the rice can be quickly lowered to a temperature suitable for keeping the rice warm, and there is an effect that deterioration such as drying and yellowing due to the high temperature during the heat retention can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view of a rice cooker showing one embodiment of the present invention. FIG. 2 is a control block diagram. [Description of Signs] 7a Inner pot temperature detecting means 14 control unit 15 cooling fan

Claims (1)

(57) [Claims] [Claim 1] An inner pot stored in the main body, a heating means including an induction heating coil and a heater for heating the inner pot, and detecting a temperature of the inner pot. In a rice cooker provided with an inner pot temperature detecting means, a control unit for controlling energization of a heating means in accordance with a rice cooking mode based on temperature information from the inner pot temperature detecting means, and a cooling fan for cooling the control unit, the cooling fan (1
5) to cool the inside of the control unit (14) and the main unit (1)
The control unit (14) drives the cooling fan (15) during rice cooking to cool the control unit (14), and also keeps the temperature from the inner pot temperature detection means (7a) during the rice keeping. The cooling fan (15) is driven until the temperature information of the main body reaches a predetermined temperature suitable for heat retention, thereby cooling the inside of the main body (1).
A rice cooker characterized by the following.