JPH0615210Y2 - Cooking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a cooker that controls the temperature of a heating chamber by a heater and a temperature control device to perform grill cooking or oven cooking.

<Prior Art> Conventionally, in order to keep the temperature of the heating chamber constant, a thermosensitive element such as a thermistor is attached to the heating chamber, and the heater is turned on when the temperature of the heating chamber is below a certain value as shown in FIG. ,
It turned off when it exceeded a certain value. This heater O
A certain temperature difference was set between the N temperature and the heater OFF temperature in order to prevent chattering of the relay.

Further, the thermistor has a thermal time constant, and there is a certain delay in following the heating chamber temperature.

<Problems to be solved by the invention> In this conventional example, the heater is turned on and the heater is turned off.
The difference between the maximum temperature and the minimum temperature during control was large due to the synergistic effect of the temperature difference from the set temperature and the delay due to the thermal time constant of the thermistor, and the difference between the set temperature and the actual heating chamber temperature was large.

<Means for Solving Problems> In order to solve the above problems, the present invention provides a heating chamber for storing food, an upper heater and a lower heater provided in the heating chamber, and a temperature in the heating chamber. A heat-sensitive element for detecting,
In the operation section for setting the temperature of the heating chamber, and the one for controlling the temperature by turning on and off the upper heater and the lower heater according to the temperature detected by the heat sensitive element and the set temperature, the upper heater and the lower heater are When the upper heater and the lower heater are turned off at the same time, and when the upper heater and the lower heater are turned off at the same time, O of the upper heater and the lower heater is kept regardless of the temperature of the heating chamber.
This does not change N-OFF.

<Action> The cook opens the door (not shown) of the heating chamber 1 and puts the food on the turntable 2 and closes the door, and then sets the cooking course, the heating set temperature and the heating time in the operation section and sets the start switch (Fig. Press (not shown) to start cooking.

The control circuit 6 selects the heating means such as the upper heater 4 and the lower heater 3 to be used according to the cooking course previously set, and only the upper heater 4 is used in the case of grill cooking or the upper heater 4 and lower are used in the case of oven cooking. When the heater 3 is turned on at the same time to start heating and the temperature of the heating chamber reaches the set temperature, the upper heater 4 and the lower heater 3 are turned off at the same time, and at the same time, a time of 5 seconds is measured. When the temperature of the heating chamber is lower than the set temperature by the signal, the upper heater 4 and the lower heater 3 are turned on, and when the temperature is higher, the upper heater 4 and the lower heater 3 are kept off, and then the heating chamber temperature becomes lower than the set temperature. Top heater 4
By turning on the lower heater 3 and turning on the lower heater 3 for 5 seconds in the same manner as above until the end of the heating time, smooth temperature control with little error between the actual heating chamber 1 temperature and the set temperature becomes possible, and the relay I no longer have to worry about chattering 7.

<Example> A cooking device of the present invention will be described with reference to the drawings.

FIG. 1 is a principle view showing an embodiment of the present invention. Reference numeral 1 is a heating chamber for storing and cooking food, and a turntable 2 for loading and rotating food at the time of cooking is provided below the inside of the heating chamber. A lower heater 3 for heating is positioned between the table 2 and the bottom of the heating chamber 1, and an upper heater 4 is provided between the turntable 2 and the ceiling surface of the heating chamber 1 along the ceiling surface.

5 is a heat-sensitive element attached to the wall surface of the heating chamber 1,
The temperature information of the heating chamber 1 is provided to the control circuit 6.

In this embodiment, the thermosensitive element 5 uses a thermistor sensor, and the thermistor sensor has a thermal time constant. Therefore, temperature information delayed for several seconds with respect to the actual change in the heating chamber temperature due to its own heat capacity is obtained. It is what is output.

In the case of grilled dishes such as grilled fish and the like, the control circuit 6 cooks only with the upper heater 4 according to the cooking course such as grilled dishes and oven dishes input by the operation unit (not shown), and makes bread etc. In the oven cooking, the upper heater 4 and the lower heater 3 are heated at the same time, and when the set temperature is reached, the upper heater 4 and the lower heater 3 are simultaneously turned on and off to maintain the set temperature.

By not providing a difference between the temperature of the heater ON and the temperature of the heater OFF, the error between the set temperature and the actual temperature of the heating chamber 1 is reduced, and when the upper heater 4 and the lower heater 3 are simultaneously turned ON, and When the upper heater 4 and the lower heater 3 are turned off at the same time, the heaters 3 and 4 are turned on or off to prevent the relay 7 in the control circuit 6 from chattering. Regardless of that, the state is maintained, and ON or OFF of the upper heater 4 and the lower heater 3 is determined by the temperature of the heating chamber 1 after 5 seconds.

The operation will be described with reference to FIG. 2. First, the cook opens the door (not shown) of the heating chamber 1 to put food on the turntable 2 and closes the door. Cooking is started by setting temperature and heating time and pressing a start switch (not shown).

The control circuit 6 selects the heating means such as the upper heater 4 and the lower heater 3 to be used depending on the cooking course previously set. Only the upper heater 4 in the case of grill cooking or the upper heater 4 and the lower in the case of oven cooking. When the heater 3 is turned on at the same time to start heating, and when the temperature of the heating chamber reaches the set temperature, the upper heater 4 and the lower heater 3 are turned off at the same time, and at the same time, the time is measured for 5 seconds. When the signal indicates that the heating chamber temperature is lower than the set temperature, the upper heater 4 and the lower heater 3 are turned on. When the signal is higher, the upper heater 4 and the lower heater 3 are kept off. After that, the heating chamber temperature becomes lower than the set temperature. Top heater 4
By turning on the lower heater 3 and turning on the lower heater 3 for 5 seconds in the same manner as described above until the end of the heating time, smooth temperature control with little error between the actual temperature of the heating chamber 1 and the set temperature becomes possible, and the relay I no longer have to worry about chattering 7.

In this embodiment, the upper heater 4 and the lower heater 3 are O
Although the counting time after N or OFF was set to 5 seconds, it varies depending on the size of the heater used, the thermal time constant value of the thermistor sensor, or the size of the heating chamber.

<Effects of the Invention> As described above, according to the present invention, a heating chamber for storing food, an upper heater and a lower heater provided in the heating chamber, a heat-sensitive element for detecting the temperature in the heating chamber, and a heating device. In the operation part for setting the temperature of the room, and for controlling the temperature by turning on and off the upper heater and the lower heater according to the temperature detected by the thermosensitive element and the set temperature, the upper heater and the lower heater are simultaneously operated. The ON-O of the upper heater and the lower heater is turned on regardless of the temperature of the heating chamber for a predetermined time from when the heater is turned on and when the upper heater and the lower heater are simultaneously turned off
Since the FF is not changed, smooth heating chamber temperature control with less error is possible.

[Brief description of drawings]

FIG. 1 is a principle diagram of one embodiment of the invention, FIG. 2 is a temperature characteristic diagram of the same, and FIG. 3 is a temperature characteristic diagram of a conventional example. 1 ... Heating chamber, 3 ... Lower heater, 4 ... Upper heater, 5 ... Heat sensitive element, 6 ... Control circuit.

Claims (1)

[Scope of utility model registration request] 1. A heating chamber for accommodating food, an upper heater and a lower heater provided in the heating chamber, a thermosensitive element for detecting the temperature in the heating chamber, and an operating section for setting the temperature of the heating chamber. In order to control the temperature by turning on and off the upper heater and the lower heater according to the temperature detected by the heat sensitive element and the set temperature, when the upper heater and the lower heater are simultaneously turned on, and the upper heater and the lower heater At the same time O
A cooker characterized by not changing ON-OFF of the upper heater and the lower heater regardless of the temperature of the heating chamber for a predetermined time period after FF.