JP2000329351A - Cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the variation in strength of hot air and the unevenness of temperature distribution in the inner box of a cooker. SOLUTION: A cooker is composed of a heat insulating box 3 formed of a heat insulating material 2, an inner box 6 which is housed in the box 3 and houses an object to be cooked, and an electric heater H which heats the object to be cooked housed in the inner box 6. The cooker is also composed of a straight fan 9 which leads the hot air from the heater H into the inner box 6, and is provided with straight fins extended outward from the center. The fan 9 is normally and reversely rotated at every prescribed time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating cooker for cooking an object to be cooked, such as a convection oven.

[0002]

2. Description of the Related Art Conventionally, as described in Japanese Utility Model Publication No. Hei 6-23841 (F24C1 / 02), this type of heating cooker includes a blower comprising a sirocco fan in a heating chamber (in the inner box in the present invention). ) A heater is provided on the right side and on the suction port side of the blower. Then, the blower blows high-temperature air heated by the heater from the right side to the left side of the heating chamber, and a large number of ingredients such as bread are arranged and cooked on the shelf of the heating chamber.

[0003]

In the prior art as described above, a sirocco fan installed on the right side of the heating chamber is used to stir the atmosphere of the heating chamber vigorously to make hot air circulation and temperature uniform. is there. However, as shown in FIG. 6, the sirocco fan has fan characteristics in which one is strong and the other is weak, so that there are places where the wind is strong and where the wind is weak, and accordingly, places where the temperature is high. And low places can be created. For example, the width of the wind speed is 2 to 10 m / sec, and the temperature difference is 205 ° C.
℃, there is a difference of 185 ℃ in low places.

Accordingly, in a confectionery which is expanded by baking such as muffins, especially when the temperature is high and the confection is placed in a strong wind, as shown in FIG. It swelled and the shape of the confection collapsed.

The present invention has been made in view of the above-mentioned problems, and provides a heating cooker for reducing a difference in the intensity of hot air and a temperature difference in an inner box.

[0006]

As means for achieving the above object, in claim 1 of the present invention, a heat insulating box defined by a heat insulating material, a heat insulating box provided in the heat insulating box, and an inside thereof are provided. An inner box for storing the object to be cooked, heating means for heating the object to be cooked in the inner box, and a linear fin for introducing hot air from the heating means into the inner box and extending outward from the center And a heating cooker that rotates the straight fan forward and backward at predetermined time intervals.

As described above, since the straight fan is rotated forward and backward at predetermined time intervals, uniform hot air can be sent into the inner box.

According to a second aspect of the present invention, there is provided a heating cooker according to the first aspect, wherein the rotation of the straight fan can be arbitrarily changed.

In this way, the intensity of the hot air sent by the straight fan can be adjusted.

According to a third aspect of the present invention, there is provided a heating cooker according to any one of the first and second aspects, wherein the operation of the heating means and the straight fan is controlled in accordance with an object to be cooked.

In this way, the temperature of the heating means and the strength of the straight fan are adjusted depending on the object to be cooked.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a convection oven equipped with the present invention, FIG. 2 is a plan sectional view of the convection oven, FIG. 3 is a front view of a straight fan, and FIG. Diagram showing the relationship, FIG.
FIG. 5 is a view showing a shape of a muffin when baked in FIG. 4.

1 and 2, reference numeral 1 denotes a convection oven, which is a heating cooker, and a heat-insulating box 3 having a front opening defined by a heat insulating material 2, and a front opening of the heat-insulating box 3 can be freely opened and closed. Door 4 which is closed outside, and a handle 4A which is provided outside the open end of the insulating door 4 and can lock the insulating door 4
And a heat ray reflective glass window 4B provided substantially at the center of the heat insulating door 4.

An inner box 6 is provided in the heat-insulating box 3, and the inner box 6 is located at a side of the inner box 6 with a cooking chamber 7 for storing an object to be cooked. In addition, a heating chamber 10 for accommodating an electric heater H as a heating means, a straight fan 9 and the like is provided. Further, the cooking chamber 7 is provided with a plurality of mesh shelves 8 on which the objects to be cooked are placed. The mesh shelves 8 are dish-shaped pans each having an iron plate coated with Teflon by the objects to be cooked. May be changed to

In this embodiment, the heating chamber 10
The heating chamber 10 is formed by a side surface inside the inner box 6 and a fan casing 11 provided substantially in parallel with a predetermined interval from the side surface, but is provided separately from the inner box 6. Is also good.

A suction port 12 is formed at a position of the fan casing 11 opposite to the straight fan 9, and a vertically extending air outlet 13 is formed in front of and behind the suction port 12. ing. The cooking chamber 7 and the heating chamber 10 of the inner box 6 communicate with each other at the inlet 12 and the outlet 13, and the wind circulates as shown by the white arrow in FIG. 2.

Here, the straight fan 9 is a disk 9A.
And a plurality of fins 9B erected on one surface side of the disk 9A and radially extended from the center of the disk 9A. The straight fan 9 is rotatable in the forward and reverse directions by a fan motor FM located outside the inner box 6. The fins 9B are formed as straight flat plates, and are formed integrally with the disk 9A.

When such a straight fan 9 is used, as shown in FIG. 3, when rotating in one direction, the upper part on the front side (the heat insulating door 4 side) becomes a strong wind and the lower part becomes a weak wind, and the upper part on the back side is a weak wind. The reverse is true when the wind turns strong in the downward direction and rotates in the opposite direction.

Therefore, the hot air from the front outlet 13A and the rear outlet 13B can be made uniform.

Further, since the fan motor FM is controlled by an inverter (strong rotation is 50 Hz and weak rotation is 40 Hz), the fan motor FM can have an arbitrary wind speed, and the electric heater is PID controlled (proportional control). In addition, overshoot can be prevented as much as possible, and the optimum temperature can be kept constant.

Therefore, the wind speed and the heating temperature can be easily changed depending on the object to be cooked, and the temperature can be controlled more accurately.

Further, a ventilation port 15 for ventilating is provided at a rear upper portion of the inner box 6.
A temperature sensor 16 is provided. Further, on the right side of the front opening in the inner box 6, an interior light L for illuminating the inside of the inner box 6 is provided.
Is provided.

Further, a door switch DS for detecting opening and closing of the heat insulating door 4 is provided at a lower edge of the front opening of the heat insulating box 3, and the door switch DS detects an open state of the heat insulating door 4. In this case, the power supply to the electric heater H and the fan motor FM is cut off.

A control panel 19 is provided on the right front side of the heat insulating box 3. Above the control panel 19, a ventilation knob 20 for opening and closing the ventilation opening 15 is provided. Below the thermometer 21, a thermometer 21 for displaying the temperature in the refrigerator and a thermo dial 22 for setting the temperature are arranged. Has been established. Further below, a time indicator EC for displaying the cooking time, a timer set dial 24 for setting the cooking time, a timer start button SW
2 are provided side by side. Below these, a power switch PS, an interior light switch LS for turning on the interior light L, and a fan motor F of the straight fan 9 are further provided.
A forced air switch SW4 for forcibly operating M and an air volume changeover switch SW3 for manually switching the strength of the straight fan 9 are provided.

The fan motor FM is provided with the inner box 6
It is installed outside. Further, the forced air switch SW4 keeps the operation of the fan motor FM even when the heat insulating door 4 is opened, and is used for lowering the temperature in the inner box 6.

The control panel 19 is openable and closable. An electrical box 31 for controlling the convection oven 1 of the present embodiment is provided on the back side of the control panel 19. On the front side, a reset button 32 is provided.

Next, in the case of a confectionery to be expanded by baking such as a muffin, as shown in FIG. 4, first, as shown in FIG.
The heating temperature of the electric heater H is set to 180 ° C. and baking is performed for 10 minutes to sufficiently expand and expand the muffin. The sufficiently large and high formed muffins are then baked at 200 ° C. The temperature rises from 180 ° C to 200 ° C in about 3 minutes,
After baking for 10 minutes after the temperature reaches 00 ° C., the surface of the muffin can be browned.

As described above, the hot air is uniformly sent to the cooking chamber 7 using the straight fan, and by performing such control, the muffin is soft inside and the surface can be baked hard and crisp. Good quality can be achieved.

Further, when the sponge cake or the like is formed as a whole softly, the electric heater H is set to PI at a temperature of 180 ° C.
By performing D control, a soft sponge cake can be provided.

As described above, since the electric heater H is controlled by the PID, it is possible to prevent excessive burning and burning.

[0032]

As described above in detail, according to the first aspect of the present invention, since the straight fan is rotated forward and backward at predetermined time intervals, uniform hot air can be sent into the inner box.

Accordingly, it is possible to prevent irregularities in the shape of the object to be cooked, uneven grilling such as unburnt burning and over-burning as much as possible.

According to the second aspect of the present invention, the strength of the hot air sent by the straight fan can be adjusted, so that the optimum wind speed can be adjusted according to the object to be cooked.

According to the third aspect of the present invention, the temperature of the heating means and the strength of the straight fan are adjusted by the object to be cooked.

Therefore, the optimum wind speed according to the object to be cooked,
The heating temperature can be set, and the object to be cooked can be optimally cooked.

[Brief description of the drawings]

FIG. 1 is a perspective view of a convection oven equipped with the present invention.

FIG. 2 is a plan sectional view of a convection oven.

FIG. 3 is a front view of a straight fan.

FIG. 4 is a diagram showing the relationship between temperature and time when baking muffins.

FIG. 5 is a view showing a shape of a muffin when baked in FIG. 4;

FIG. 6 is a front view of a conventional sirocco fan.

FIG. 7 is a diagram showing a failure example of a muffin in the related art.

[Explanation of symbols]

 H Electric heater 1 Convection oven 2 Insulation material 3 Insulation box 6 Inner box 9 Straight fan 9B Fin

Claims (3)

[Claims] 1. A heat insulating box defined by a heat insulating material, an inner box provided in the heat insulating box to store a food therein, and a heating device for heating the food in the inner box. And a straight fan having a linear fin extending outward from the center by introducing hot air from the heating means into the inner box. The straight fan rotates forward and backward at predetermined time intervals. A cooking device characterized by being made to work. 2. The heating cooker according to claim 1, wherein the rotation of the straight fan can be arbitrarily changed. 3. The heating cooker according to claim 1, wherein the operation of the heating means and the operation of the straight fan are controlled in accordance with an object to be cooked.