JP2500502B2 - Heating cooker - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a heating means outside a heating chamber for accommodating food to be cooked, a blowing means for feeding heated air into the heating chamber, and a control means for controlling these means. A heating cooker provided.

[0002]

2. Description of the Related Art Such a heating cooker is a so-called convection type oven, which does not directly heat the object to be cooked placed in the heating chamber by radiant heat, but uses a heating means provided outside the heating chamber. The heated air is blown into the heating chamber by the blowing means, and the food to be cooked is heated by convection heat.

Generally, in such heating cooking,
Heating (hereinafter referred to as preheating) is performed in advance, and after the temperature of the heating chamber reaches a set temperature, the food to be cooked is put into the heating chamber and cooking is performed. This is because, if the food to be cooked is put into the heating chamber from the beginning without preheating and the heating and cooking are started, there arises a problem that the shape of the dough is lost when the cake is baked, for example.

[0004]

Since preheating is required, it is not possible to achieve complete automatic cooking. That is,
Even in the automatic cooking menu, it is necessary to put the material to be cooked in the heating chamber and press the start switch after preheating. In the case of a so-called microwave oven that combines high-frequency heating and convection heating, in the case of an automatic cooking menu using high-frequency heating, put the object to be heated in the heating chamber, press the start switch once, and touch the hands completely until cooking is complete. Since it is not necessary, there is a possibility that it may cause an operation error in the automatic cooking menu due to convection heating. The present invention has been made in view of such circumstances, and an object thereof is to achieve fully automatic cooking without (apparently) preheating as described above.

[0005]

The cooking device according to the present invention comprises:
A heating means is provided outside a heating chamber for storing an object to be cooked, a blowing means for feeding heated air into the heating chamber, and a control means for controlling these means, and a first feature thereof. The configuration is such that the control means operates the heating means in response to a cooking start signal and operates the air blowing means after a predetermined time has elapsed. A second characteristic configuration is provided with temperature detecting means for detecting the temperature of the heated air, the control means operates the heating means in response to a cooking start signal, and the temperature detected by the temperature detecting means reaches a predetermined temperature. It is configured so that the blower means is activated when it reaches.

[0006]

According to the first characteristic configuration, when the food to be cooked is housed in the heating chamber and, for example, the start switch is pressed to start cooking, only the heating means is operated first. Since the air blowing means remains stopped, the heated air is only collected around the heating means and is not sent to the heating chamber. Then, by operating the air blowing means after a predetermined time has elapsed, the heated air is sent into the heating chamber, and the temperature of the heating chamber rises rapidly. The operation of the second characteristic configuration is not the time when the blower unit is operated but the time when a predetermined time has elapsed,
The operation is the same as that of the first characteristic configuration except that the temperature of the heated air reaches a predetermined temperature.

[0007]

EFFECTS OF THE INVENTION Preheating is apparently unnecessary in any of the first and second characteristic configurations. That is, the food to be cooked can be put in the heating chamber before the cooking is started by operating the start switch or the like. Then, since the temperature of the heating chamber rapidly rises, it is possible to achieve automatic cooking without impairing the performance of cooking.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. The heating device whose schematic configuration is shown in FIG. 1 is a so-called oven microwave oven capable of performing convection heating and high frequency heating.

A convection heater 2 as a heating means for heating the heating chamber 1 by convection heat is provided in the convection heater chamber 10 on the rear side of the heating chamber 1, and for feeding heated air into the heating chamber 1. A convection fan motor 3 is provided as an air blowing unit. Further, a magnetron 4 for cooking the food to be cooked stored in the heating chamber 1 by high frequency heating is also provided,
A control unit 5 is provided as control means for controlling these operations.

The control unit 5 is equipped with a microcomputer and controls on / off of drive circuits for the convection heater 2, the convection fan motor 3, the magnetron 4 and the like according to pre-programmed cooking software. Further, a keyboard 7 and a display 8 are provided on the operation panel 6, and the control unit 5 also controls these input / output.
The keyboard 7 is used for setting a cooking menu and instructing start and stop of cooking. The display device 8 displays the setting contents of the cooking menu, or displays the timer display during cooking, the temperature of the heating chamber detected by the internal temperature sensor 9, and the like. The convection heater chamber 10 also has a thermistor temperature sensor (hereinafter referred to as a heater temperature sensor) 11
Is provided to detect the temperature of the air heated by the convection heater 2.

The high frequency heating by the magnetron 4 will be briefly described. The control unit 5 controls the oscillation output of the magnetron 4 to adjust the heating output, and the heating time is managed by the soft timer of the microcomputer. The heating output and the heating time can be manually set with the keyboard 7. Alternatively, if the automatic cooking menu (recipe) is selected, the microcomputer automatically determines an appropriate heating output and heating time based on the program and the detection information of the sensor and cooks. In any case, the food to be cooked is placed in the heating chamber 1, the contents of the cooking are set, and when the start key is pressed, the cooking is started, and when the cooking is completed, the cooking is automatically stopped and the buzzer sounds. In the meantime, it does not take any effort.

Next, the procedure of cooking with the convection heater 2 will be described. First, the case of normal manual setting will be described with reference to the flowchart of FIG. The target temperature (the temperature inside the cooking cabinet) is set with the keyboard 7 and the start key is pressed. At this time, the food to be cooked is not yet placed in the heating chamber 1. The control unit 5 operates the convection heater 2 and the convection fan motor 3.
The convective heat gradually raises the temperature of the heating chamber, and when the internal temperature sensor 9 detects that the temperature has reached the target temperature, the control unit 5 sounds a buzzer to notify the end of preheating. Then, the convection heater 2 is controlled to be turned on / off to keep the internal temperature at the target temperature.

The food to be cooked is placed in the heating chamber 1 and the keyboard 7
Set the cooking time with and press the start key. Then
The control unit 5 counts down the timer while continuing the internal temperature control by turning on / off the convection heater 2 and heats the food to be cooked for the set cooking time. When the timer expires, the control unit 5 sounds a buzzer to notify the completion of cooking.

When the automatic cooking menu is set, the target temperature and cooking time suitable for the menu are automatically set. However, the preheating until the heating chamber 1 reaches the target temperature is necessary as in the case of the manual setting described above, and if the food to be cooked is put in the preheating, the quality of cooking becomes poor. For example, when baking a cake, the dough will sag. Therefore, it is necessary to put the food to be cooked in the heating chamber 1 and press the start key as soon as the completion of preheating is notified. However, this is not a complete automatic cooking menu. Since it differs from the automatic cooking menu of high frequency heating, it is easy to cause an operation error.

Therefore, in the microwave oven according to the present embodiment, even in the case of the automatic cooking menu using the convection heater 2, if the food to be cooked is put in the heating chamber 1 from the beginning and the start key is pressed, it does not take time to complete the cooking. Therefore, the following control is performed. Description will be given along the flow chart of FIG. Put the food to be cooked in the heating chamber 1, select the automatic cooking menu with the keyboard 7, and press the start key. The control unit 5 first energizes only the convection heater 2. That is, the convection fan motor 3 remains stopped. Therefore, the temperature of the convection heater chamber 10 rises quickly, but the temperature of the heating chamber 1 does not rise so much. It only slightly rises due to conduction heat through the wall surface at the boundary between the heating chamber 1 and the convection heater chamber 10.

When the heater temperature sensor 11 in the convection heater chamber 10 detects that the temperature has reached a predetermined temperature, the convection fan motor 3 is operated and the heated air in the convection heater chamber 10 is sent to the heating chamber 1. Then, the temperature of the heating chamber 1 rises at once.
In addition, the time after the start is managed by the internal timer of the microcomputer, and the operation of the convection fan motor 3 is started even when this timer (hereinafter referred to as the preheat timer) ends. That is, the heater temperature sensor 11
The operation of the convection fan motor 3 is started under the OR condition of the preheat timer. The preheat timer can be arbitrarily changed and set, but is usually set to 5 minutes.

After that, the control unit 5 turns on the convection heater 2 as in the case of the manual setting described above.
The OFF control is performed to keep the internal temperature at the target temperature, the timer counts down, and the food to be cooked is cooked for a predetermined cooking time. By performing the control as described above, apparent preheating is eliminated, and if the object to be cooked is put into the heating chamber 1 from the beginning and the start key is pressed, fully automatic cooking that does not take time to complete the cooking is realized. Since the temperature of the convection heater chamber 10 decreases as the convection fan motor 3 operates, the predetermined temperature is set to a temperature about 20 ° C. higher than the target temperature of the heating chamber.

In the above embodiment, the convection fan motor 3 is operated depending on the OR condition whether the heater temperature sensor 11 reaches a predetermined temperature or the preheat timer ends.
However, this is for safety, and it is not always necessary to check both conditions. In other words, check only one of the conditions,
The operation of the convection fan motor 3 may be started.

Further, the rotation speed of the convection fan motor 3 can be controlled so as to avoid a rapid temperature drop in the convection heater chamber 10 and the convection heater 2 accompanying the start of operation of the convection fan motor 3. Good. That is, immediately after the start of operation, it is rotated at a low speed, and the detected value of the inside temperature sensor 9 and the heater temperature sensor 1
Based on the detected value of 1, the rotation speed is gradually increased. As a method of speed control, various methods such as changing the applied voltage in the case of a DC motor and phase control using a triac in the case of an induction motor can be applied.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a block diagram of a heating cooker according to an embodiment of the present invention.

[Fig. 2] Flow chart of cooking procedure when manual setting is performed by the heating cooker.

[Fig. 3] Flow chart of a cooking procedure when an automatic menu is selected by the heating cooker.

[Explanation of symbols]

 1 Heating Chamber 2 Heating Means 3 Blower Means 5 Control Means 11 Temperature Detection Means

Claims (2)

(57) [Claims] 1. A heating means (2) outside a heating chamber (1) for containing a food to be cooked, a blowing means (3) for feeding heated air into the heating chamber (1), and these means. A heating cooker comprising control means (5) for controlling (2) and (3), wherein the control means (5) activates the heating means (2) in response to a cooking start signal, and the heating means (2) is operated after a predetermined time has elapsed. A cooker configured to activate the blowing means (3). 2. A heating means (2) outside the heating chamber (1) for containing the food to be cooked, a blowing means (3) for feeding heated air into the heating chamber (1), and these means. A heating cooker comprising a control means (5) for controlling (2) and (3), comprising temperature detection means (11) for detecting the temperature of the heated air, the control means (5).
Activates the heating means (2) by a cooking start signal,
A heating cooker configured to operate the blower means (3) when the temperature detected by the temperature detecting means (11) reaches a predetermined temperature.