JPH0440086Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is equipped with a high-frequency heating means for internally heating the food and a hot air circulation heating means mainly for browning the outer surface of the food. This invention relates to a high-frequency heating cooker.

(Problems to be solved by conventional techniques and ideas) Conventionally, in this type of heating cooker, when cooking is performed using both high frequency heating means and hot air heating means, the cooking temperature and high frequency The irradiation time is set in advance depending on the type of food, and both heating means are operated based on the irradiation time.

Furthermore, in general, when cooking various foods, it is desirable that the internal and external surfaces of the food be finished at the same time.

However, in this conventional heating cooker,
As shown in FIG. 6, the temperature in the heating chamber reaches the cooking set temperature before the high frequency irradiation time reaches the set time, and after that, the hot air circulation type heating means is controlled on and off. Since the temperature inside the heating chamber is maintained at a set temperature, there is a problem in that the outer surface of the food is finished before the cooking of the inside of the food is finished.

(Purpose of the invention) This invention was made to solve the above-mentioned problems, and its purpose is to provide a high-frequency heating cooker that can match the internal and external finishing times when cooking food. It's about doing.

(Means for solving the problem) In order to achieve the above object, this invention includes a temperature sensor for detecting the temperature of the heating chamber, and a temperature sensor for detecting the temperature inside the food when both heating means are operated simultaneously. a storage means for storing, for each food, a temperature change at which the temperature in the heating chamber reaches a set temperature suitable for finishing the food at the time when the cooking of the food ends, as standard temperature change data; until the temperature of the heating chamber rises to the set temperature, both heating means are operated simultaneously, and a detection signal from the temperature sensor is sent so that the temperature inside the heating chamber changes in accordance with the standard temperature change data. A control means is provided for controlling the operation of the hot air circulation type heating means based on the temperature, and stopping the operation of both heating means when the set temperature is reached.

(Function) Therefore, when cooking starts, the high frequency heating means and the hot air circulation type heating means are simultaneously operated until the temperature of the heating chamber rises to the set temperature, and the temperature inside the heating chamber is adjusted according to the standard temperature change data. The operation of the hot air circulation type heating means is controlled based on the detection signal from the temperature sensor so that the temperature changes along the temperature, and when the set temperature is reached, the operation of both heating means is stopped.

(Example) Hereinafter, an example of a heating cooker embodying this invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 to 3, the outer box 1 of the cooking device includes a bottom plate 1a, a cover 1b covering the top surface and both left and right sides, and a back plate 1c. A heating chamber 2 is provided inside the outer box 1, and an opening is formed in the front surface of the heating chamber 2 to take food in and out. In order to open and close the opening, a door 3 is provided on the outer box 1 so as to be rotatable about a shaft 3a, and a see-through window 3b is attached approximately at the center of the door 3.

A turntable 4 for placing food is disposed on the upper surface of the bottom wall of the heating chamber 2, and is driven to rotate via a coupling 4b as a gear motor 4a rotates.
A magnetron 5 constituting a high-frequency heating means is provided on the outer right side of the heating chamber 2, and the high frequency waves generated by the magnetron 5 are introduced into the heating chamber 2 from the upper right side of the heating chamber 2 through a waveguide 5a. . 6
is a cooling fan for the magnetron 5, and 7 is its fan motor. 8 is a duct that introduces cooling air from the magnetron 5 into the heating chamber 2 through a hole 9 on the right side of the heating chamber, and 10 is a damper that opens and closes a passage within the duct 8.

As shown in FIGS. 1 and 2, the heating chamber back wall 2
A large number of hot air outlets 11 are transparently installed in the rectangular area on the right side of a, extending over almost the entire area in the vertical direction of the heating chamber 2, and at the rear of these hot air outlets 11, there are opposing hot air outlets for generating hot air. A heater 12 is provided, and its periphery is covered with a heater cover 13.

Further, as shown in FIGS. 2 and 3, a large number of air intake ports 14 are transparently provided in a circular area below the left side of the back wall 2a of the heating chamber, and these air intake ports 1
Behind 4 and facing it is hot air circulation fan 1.
5 is arranged, and the surrounding area is the heater cover 13
The fan casing 16 communicates with the fan casing 16. Then, as the hot air circulation fan 15 is rotated by the fan drive motor 17 arranged on the back side of the fan casing 16, the air sucked into the fan casing 16 from the intake port 14 is blown into the heater cover 13. The hot air is heated by the hot air generating heater 12 and supplied into the heating chamber 2 from the hot air outlet 11 .

Furthermore, a large number of exhaust ports 18 corresponding to the upper part of the hot air circulation intake ports 12 are transparently provided in a rectangular area above the left side of the back wall 2a of the heating chamber, and the exhaust ports 18 and the back plate 1c are provided. An exhaust guide 20 is disposed above the fan casing 16 and connects to the exhaust port 19 .

As shown in FIG. 1, the hot air generation heater 1
A temperature sensor 21 made of a thermistor or the like is provided on the right inner surface of the heater cover 13 adjacent to the heater cover 13.
When cooking with high frequency and hot air simultaneously, the temperature of the hot air is detected and a detection signal corresponding to the temperature is output.

Next, the electrical configuration of the heating cooker will be explained according to FIG. Access memory (RAM) 33 is connected.
The ROM 32 stores a program for controlling the entire operation of the heating cooker, and also controls when the hot air generation heater 12 and the hot air circulation fan 15 are operated with no food stored in the heating chamber 2. temperature rise data, cooking time and cooking temperature data according to the type of cooking are stored.

In addition, the CPU 31 includes a start switch 34a,
Switch group 34 including cooking selection switch 34b etc.
and the temperature sensor 21 are connected via an input interface 35, from which various signals are input. Further, the magnetron 5, hot air generation heater 12, and fan drive motor 17 are connected to the CPU 31 via an output interface 36 and drive circuits 37, 38, and 39, and drive and stop signals are sent to them from the CPU 31. Output.

Then, when the cooking temperature and cooking time suitable for the finishing of various foods are selected and set based on the operation of the cooking selection switch 34b, the CPU 31 selects and sets the cooking temperature and cooking time as indicated by the dashed line in FIG. 5 based on the control temperature rise data. Standard temperature change data suitable for various kinds of cooking is determined and stored in the RAM 33. In other words, this standard temperature change data is a temperature change that will cause the temperature inside the heating chamber 2 to reach the set temperature suitable for the finish of the food at the time when the internal heating of the food is completed during simultaneous heating cooking with high frequency and hot air. It represents. In addition, the CPU 31 operates the magnetron 5, the hot air generation heater 12, and the fan drive motor 17 from the start of cooking food until the temperature of the heating chamber 2 rises to the set temperature, and also operates the magnetron 5, the hot air generation heater 12, and the fan drive motor 17, and The operation of the heater 12 and fan drive motor 17 is controlled based on the detection signal from the temperature sensor 21 so that the temperature changes in accordance with this standard temperature change data, and when the set temperature is reached, the magnetron 5 , the operation of the hot air generation heater 12 and the fan drive motor 17 is stopped.

Now, in the heating cooker configured as described above, when performing simultaneous heating cooking with high frequency and hot air, food is placed on the turntable 4 in the heating chamber 2, and the food is placed on the turntable 4 in the heating chamber 2. After operating the cooking selection switch 34b, the start switch 34
When a is operated, the CPU 31 reads the reference temperature rise data from the ROM 32, determines standard temperature change data suitable for cooking as shown by the dashed line in FIG.
Store in 3. Additionally, the magnetron 5, the hot air generation heater 12, and the fan drive motor 17 start operating.

Then, the elapsed time after starting this heating cooking is counted and stored in the RAM 33. Also,
During this cooking, the CPU 31 compares the temperature in the heating chamber 2 with the standard temperature change data based on the detection signal output from the temperature sensor 21, and determines the temperature in the heating chamber 2 as shown in FIG. The heater 12 and the fan drive motor 17 are operated so that the temperature changes in accordance with the standard temperature change data. That is, the CPU 31 compares the standard temperature corresponding to a specific time with the actual cooking temperature, and when the difference ΔT1 exceeds a predetermined value, the CPU 31 stops the operation of the heater 12 for a predetermined period of time, and then When the temperature difference ΔT2 similarly exceeds a predetermined value, the operation of the heater 12 is restarted. By repeating this operation, the temperature inside the heating chamber 2 is changed in accordance with the standard temperature change data.

When the temperature of the heating chamber 2 reaches the set temperature shown in FIG. 5 (predetermined cooking time has elapsed), the operations of the magnetron 5, hot air generation heater 12, and fan drive motor 17 are stopped, and the food is heated and cooked. ends.

Therefore, with an extremely simple operation of only operating the cooking selection switch 34b at the start of heating cooking,
Cooking can be started, and the food can be properly cooked at the time when the cooking inside the food is finished.

Note that this invention is not limited to the above-mentioned embodiments, and may be realized by arbitrarily changing the configuration of each part without departing from the spirit of this invention, such as storing standard temperature change data in the ROM 32. It is also possible to do so.

(Effects of the invention) As detailed above, this invention has the advantage that when simultaneous heating is performed using high frequency waves and hot air, it is possible to match the finishing times of the inside and outside of the food and to properly finish cooking. be effective.

[Brief explanation of the drawing]

Figures 1 to 5 show an example of a heating cooker that embodies this invention. Figure 1 is a cross-sectional view of the heating cooker, and Figure 2 is a front view of the heating cooker. 3 is a partial sectional view taken along line A-A in FIG. 2, FIG. 4 is a block diagram showing the electrical configuration, and FIG. 5 shows the relationship between the temperature of the heating chamber and the elapsed time. This is a graph showing. FIG. 6 is a graph showing the relationship between the temperature of the heating chamber and the elapsed time in a conventional heating cooker. In the figure, 2 is a heating chamber, 5 is a magnetron that constitutes a high-frequency heating means, 12 is a hot air generation heater that is a hot air circulation type heating means, 21 is a temperature sensor, 31 is a CPU as a control means, and 33 is a storage means. RAM.

Claims (1)

[Scope of Claim for Utility Model Registration] In a high-frequency heating cooker equipped with a high-frequency heating means 5 and a hot air circulation type heating means 12, a temperature sensor 2 for detecting the temperature of a heating chamber 2.
1. When both the heating means 5 and 12 are operated at the same time, the temperature change in which the temperature inside the heating chamber 2 reaches a set temperature suitable for finishing the food at the time when the internal cooking of the food is completed is defined as the standard temperature. It is equipped with a storage means 33 for storing change data for each food, and operates both the heating means 5 and 12 simultaneously from the start of cooking the food until the temperature of the heating chamber 2 rises to the set temperature. , heating chamber 2
The operation of the hot air circulation type heating means 12 is controlled based on the detection signal from the temperature sensor 21 so that the temperature inside changes in accordance with the standard temperature change data, and when the set temperature is reached, both heating means 5,1
1. A high-frequency heating cooking device characterized by being provided with a control means 31 for stopping the operation of 2.