JP3304150B2 - Insulated container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic jar, a jar rice cooker and the like for the purpose of providing an automatic temperature controller for maintaining a constant temperature, suppressing dew condensation on a lid, and keeping the temperature in a better condition. It concerns a container.

[0002]

2. Description of the Related Art A conventional thermal insulation container has an inner pot accommodated in a main body, a lid covering an upper opening of the main body and the inner pot, and a main body heater and a lid heater are provided in the main body. A temperature controller is provided, and when the temperature exceeds the specified control temperature, the energization of the main body heater and the lid heater is stopped, and when the temperature is less than the control temperature, the energization is restarted and the temperature is kept constant, As shown in Fig. 5, the rice is hot immediately after cooking and is above the specified control temperature.
The lid heater is also kept off and does not generate heat. Eventually, the temperature of the rice gradually decreases, and when the temperature falls below the control temperature, the duty ratio of the body heater and the lid heater becomes 100%,
% ON / OFF operation is repeated. (For example, actual opening 62
See -100126. Also, in recent years, in order to suppress temperature unevenness and dew condensation on the lid, a lid sensor is newly provided in the lid heater unit, and the power supply to the lid heater is controlled by the output of the lid sensor. There are JP-A-3-16519 and JP-A-4-36922.

[0003]

In the conventional technology in which power control of the main body heater and the lid heater is synchronized and ON-OFF control is performed at a predetermined control temperature, ON-OFF is simply synchronized with a constant power. , Room temperature fluctuation and OF
Condensation on the lid at the time of F becomes a problem.

In the case where a lid sensor is newly provided in the lid heater portion, dew condensation on the lid can be suppressed. However, in order to provide the lid sensor, wiring processing of lead wires from inside the main body, addition of circuits, and the like. However, there is a problem that the structure becomes complicated and the cost increases.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has an inner pot accommodated in a main body, and a lid for covering upper openings of the main body and the inner pot.
The lid is equipped with a lid heater, and the main body is provided with a main body heater, a temperature sensor that detects temperature, and a room temperature sensor that detects room temperature.The output of these temperature sensors and the room temperature sensor is compared with a specified control temperature. The main body has an automatic temperature controller that controls the energization of the main body heater and the lid heater, and this automatic temperature controller stops energizing the main body heater when the temperature sensor exceeds the specified control temperature, and when the temperature falls below the control temperature Re-energize and keep the temperature constant,
In addition, the duty ratio of the lid heater is controlled in synchronization with the ON-OFF control of the main body heater, and the duty ratio of the lid heater is determined by the outputs of the temperature sensor and the room temperature sensor. .

[0006]

According to the structure of the present invention, the power supply to the main body heater is stopped when the temperature sensor becomes higher than the predetermined control temperature, and the power supply is resumed when the temperature becomes lower than the control temperature, thereby keeping the temperature of the main body part constant. In order to control the energization rate of the lid heater in synchronization with the ON-OFF control of the main body heater,
By adding the output determined by the temperature sensor and the room temperature sensor, the temperature of the lid can be kept constant, and without the need to install a new lid sensor inside the lid, even if the room temperature changes, condensation on the lid and rice It is possible to keep the temperature of the dryness and stickiness to a minimum.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of an insulated container (jar rice cooker) to which an embodiment of the present invention is applied, FIG. 2 is a configuration diagram of a main part of the insulated container, and FIG. FIG. 4 is a diagram showing the operation of the heat insulation container and the temperature characteristics of the lid.

In the figure, an inner pot 2 is detachably housed in a cylindrical main body 1 with an upper opening and a lid 3 for covering the upper openings of the main body 1 and the inner pot 2 is openably and closably attached.
A rice cooker 4 for heating the inner pot 2 is provided at the bottom of the main body 1, a main body heater 5 for heating the side of the inner pot 2 is provided on the side of the main body 1, and a lid heater 6 is provided inside the lid 3. . On the other hand, a temperature sensor 7 is attached to the bottom of the inner pot 2, and a room temperature sensor 8 and an automatic temperature controller 9 are provided inside the main body 1.

The configuration of the automatic temperature controller 9 includes a temperature detecting section (the temperature sensor 7 and the room temperature sensor 8) and a judging section 1.
0, power control unit 1 for controlling energization of the main body heater 5
1. The power control unit 12 controls the energization of the lid heater 6.

Next, the operation of this embodiment having the above configuration will be described.

When the user puts the washed rice and an appropriate amount of water into the inner pot 2 and performs a rice cooking operation, the power supply to the rice cooker 4 is started, and the inner pot 2 is heated. "Cooked rice" is over,
When "steaming" is over, the configuration of the present invention starts, and "heat retention"
Move on to

In "warming", the power supply of the main body heater 5 is controlled by the power controller 11 by comparing the control temperature with the output of the temperature sensor 7 by the basic operation of the automatic temperature controller 9, and the lid heater 6 is controlled by the temperature sensor 7 The power is determined by the determination unit 10 based on the output of the room temperature sensor 8 and the power control unit 12 performs control to change the power in synchronization with the ON-OFF control of the main body heater 5.

Immediately after the rice is cooked, the rice is hot and the temperature of the temperature sensor 7 is equal to or higher than the control temperature. Therefore, the power control unit 11 is kept OFF by the determination unit 10, and the main body heater 5 does not generate heat. However, in the lid 3, dew condensation occurs due to the steam from the rice, so that the evaporation rate is determined by the judging unit 10 from the outputs of the room temperature sensor 8 and the temperature sensor 7 in order to evaporate the electric power. During OFF, the lid heater 6 is energized.

When the temperature of the rice gradually decreases, the temperature of the temperature sensor 7 also decreases, and when the temperature falls below the control temperature, the power control unit 11 is activated by the judgment of the judgment unit 10 and the heater 5 is energized. At this time, the duty ratio of the electric power supplied to the main body heater 5 is 100%,
The N-OFF operation is repeated. Since the lid heater 6 reduces the amount of steam generated when the temperature of the rice falls, the judging unit 10 determines, based on the output of the temperature sensor 7, a duty ratio that is gradually reduced from the current duty ratio, and a power control unit. At 12 the energization is performed.

Next, when the ON-OFF operation of the main body heater 5 starts, in synchronism therewith, the duty ratio of the lid heater 6 is increased by the judging section 10 when the main body heater 5 is ON.
When the main body heater 5 is OFF, it is set lower by the determination unit 10, and power is supplied by the power control unit 12. The setting of the duty ratio is also changed by the determination unit 10 depending on the output of the room temperature sensor 8. Here, the energization rate is a ratio of energization by the power control unit 12.

Although phase control using a triac is generally performed, in this embodiment, as shown in FIG. 3, power is controlled by how many periods the triac is turned on during a certain period of the power supply frequency. In FIG. 3, five periods of the power supply frequency are defined as one unit,
The power control is based on how many times the triac is triggered (ON) during 10 times of zero voltage detection, and shows an example in which the duty ratio is 60%.

Here, for example, in the present embodiment, as shown in FIG.
80% determined by the judgment unit 10 from the output of the temperature sensor 7
Then, the judgment unit 10 monitors the drop of the temperature sensor 7 and sets the energization rate to 70% and 6 according to the degree.
Lower to 0%. Next, when the ON-OFF operation of the main body heater 5 starts, the ON-OFF operation is monitored by the judging unit 10, and is set to 60% when ON and 40% when OFF.
Here, when the room temperature changes high, the power is supplied by the power control unit 12 at 50% -40% determined by the determination unit 10.

By changing the electric power according to the change of the rice temperature and the room temperature by the above operation, the rice is not dried or excessively lowered due to excessively high temperature of the lid 3 without adding a lid sensor inside the lid 3. Corrosion and stickiness due to water and condensation on the lid 3 can be minimized.

[0019]

According to the present invention, the lid is provided with a lid heater, the main body is provided with a main body heater, a temperature sensor for detecting the temperature, a room temperature sensor for detecting the room temperature, and the outputs of the temperature sensor and the room temperature sensor. An automatic temperature controller that controls the energization of the main body heater and lid heater by comparing with a certain control temperature and stops energization of the main body heater when the temperature sensor exceeds the specified control temperature,
When the temperature becomes lower than the control temperature, the energization is restarted, and the energization rate of the lid heater is controlled in synchronization with the ON-OFF control of the main body heater. Because the temperature was kept constant, the lid sensor was added inside the lid and the wiring of the lead wire from inside the body was not processed, and the rice was dried or dropped due to the temperature of the lid too high. It is possible to provide a heat insulation container capable of minimizing spoilage and stickiness due to passing, and dew condensation on the lid, and capable of keeping the heat for a long time while maintaining the deliciousness.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a heat retaining container showing one embodiment of the present invention.

FIG. 2 is a configuration diagram of a main part of the thermal insulation container.

FIG. 3 is a diagram showing a power control method for the lid heater.

FIG. 4 is a diagram showing the operation of the heat retaining container and the temperature characteristics of a lid.

FIG. 5 is a temperature characteristic diagram of a lid showing an example of a conventional thermal insulation container without a lid sensor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Inner pot 3 Lid 5 Main body heater 6 Lid heater 7 Temperature sensor 8 Room temperature sensor 9 Automatic temperature controller

Claims (1)

(57) [Claims] An inner pot (2) housed in a main body (1),
A lid (3) for covering the upper openings of the main body (1) and the inner pot (2), a lid heater (6) for the lid (3), and a main body heater (5) for the main body (1); And the temperature sensor (7) that detects the temperature of the inner pot (2 ) and the heat of the heater
A room temperature sensor (8) for detecting the room temperature is provided at a difficult position, and a comparison is made between the outputs of the temperature sensor (7) and the room temperature sensor (8) and a predetermined control temperature to determine whether the main body heater (5) and the lid are provided. An automatic temperature controller (9) for controlling the energization of the heater (6) is provided.
When the temperature of the temperature sensor (7) becomes higher than a predetermined control temperature, the power supply to the main body heater (5) is stopped, and when the temperature becomes lower than the control temperature, the power supply is restarted to keep the temperature constant.
The energization rate of the lid heater (6) is controlled in synchronization with the ON / OFF control of the main body heater (5), and the lid heater (6) is controlled by the outputs of the temperature sensor (7) and the room temperature sensor (8). 6) Determine the duty ratio ,
Even after the body heater (5) is off immediately after cooking,
A heat insulation container characterized by performing control to energize a heater (6) .