JPH1054566A - Oven toaster - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep the temperature of the entire in a heating chamber by circulating air in the heating chamber with the operation of a fan. SOLUTION: A fan cover 10 is attached to the outside of a portion of a heating chamber wall 1a in which suction and exhaust holes are provided, and a fan 12 is provided in the fan cover 10. A rotary shaft 13 of the fan 12 is protruded to the outside through the fan cover 10. A heat insulating plate 14 is vertically provided. A motor 15 is provided outside the heat insulating plate 14 to interrupt heat from a heating chamber 1 side and hence prevent the motor 15 from being deteriorated. A suction and exhaust hole and the fan 12 are provided to actuate the fan 12 upon heating whereby air in the heating chamber 1 is sucked from an air suction hole into the fan cover and is again exhausted. Hereby, hot air is circulated in the heating chamber 1 whereby temperature in the heating chamber 1 is kept unchanged even at any position, and hence unevenness of baking is prevented from being caused.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a structure for preventing burn unevenness in an oven toaster.

[0002]

2. Description of the Related Art An oven toaster generally has an upper heater and a lower heater in a heating chamber, and a mounting shelf for heating between the heaters. Since the space above the mounting shelf is larger in the normal heating chamber, the output of the upper heater is set higher than that of the lower heater, so that uneven burning does not occur.

[0003]

However, burn unevenness actually occurs. This is due to the fact that the center of the heating chamber is hotter than the left and right sides of the heating chamber, and the front of the heating chamber is colder than the rear side due to the outside air temperature because there is a door on the front of the heating chamber. And Of course, the arrangement of the heater and the design of the heater output are performed in consideration of such a situation, but the occurrence of burn unevenness has not been completely prevented.

[0004] The present invention has been made in view of the above circumstances, and has as its object to reliably prevent the occurrence of burn unevenness in an oven toaster.

[0005]

According to the first aspect of the present invention, an upper heater and a lower heater are provided in a heating chamber,
In an oven toaster having a mounting shelf for heating between the heaters, air is circulated in the heating chamber by the operation of the fan, and in the invention according to claim 2, an upper heater and a lower heater are provided in the heating chamber. In an oven toaster provided with a mounting shelf for heating between the heaters, an intake / exhaust hole is provided in a wall of the heating chamber, and air is introduced into the heating chamber through the intake / exhaust hole by the operation of a fan provided outside the oven. It was configured to be circulated.

According to the above inventions, the air is circulated in the heating chamber, so that the temperature of the entire heating chamber becomes constant, thereby eliminating burning unevenness.

According to the second aspect of the present invention, the air suction and exhaust holes are arranged at non-relative positions of the mounting shelf (the third aspect of the present invention), so that the air intake and exhaust are prevented by the mounting shelf and the food above the mounting shelf. Without air, which results in better air circulation.

According to the second aspect of the present invention, the air intake / exhaust hole is provided in the heating chamber wall on the electrical component arrangement space side such that the intake side is located at the center of the intake side and the exhaust side is located before and after the intake side. The described invention), the air sucked in from the center of the heating chamber is exhausted to both the front and rear sides of the heating chamber, so that the circulation is better performed.

In the invention according to claim 2, the motor is connected to the fan via a heat shield plate (claim 5).
In the described invention), heat from the heating chamber side is blocked by the heat shield plate, and thermal deterioration of the motor is prevented.

[0010] In the second aspect of the present invention, by setting the heater to a low output on the side farther from the intake and exhaust holes (the sixth aspect of the invention), the side where air circulation in the heating chamber is small and the temperature which tends to become high is heated by the heater too much. Instead, the temperature of the entire heating chamber is kept constant, and burn unevenness is eliminated.

According to the second aspect of the present invention, the heat from the heater is diffused and reflected into the heating chamber by providing the inner surface of the heating chamber wall with a diffuse reflection structure of the heat (the seventh aspect of the invention).
As a result, the temperature of the entire heating chamber becomes constant, and uneven burning is eliminated.

[0012]

1 to 3 show an oven toaster of the present invention, FIG. 1 is a simplified front view showing the internal structure, FIG.
Is a simplified side view of one side showing the internal configuration, and FIG. 3 is a simplified plan view showing the internal configuration.

Reference numeral 1 denotes a heating chamber, on the front of which a door 2 is mounted. At a position lower than the central height position in the heating chamber 1, there is provided a mounting shelf 3 for heating food, and on the ceiling surface and the bottom surface in the heating chamber 1, a bar-shaped upper heater 5 is provided.
(850 W) and a lower heater (500 W) 6.

Hereinafter, the characteristic configuration will be described. First, an electrical component placement space 7 is located on one side of the heating chamber 1, and a suction / exhaust hole 8 is provided in the heating chamber wall 1 a on the electrical component placement space 7 side. The intake / exhaust holes 8 are formed by press-forming the heating chamber wall 1a, and the central intake hole 8a and the exhaust holes 8 before and after the central intake hole 8a
b. As described above, the intake hole 8
With the configuration in which the exhaust holes 8b are provided before and after “a”, the circulation of the air accompanying the intake and exhaust is performed evenly throughout the heating chamber 1.

The position where the air intake / exhaust hole 8 is provided is a position approximately 2 cm higher than the position of the mounting shelf 3. In this way, even when a food such as a toast is placed on the placing shelf 3, the intake / exhaust operation in the intake / exhaust hole 8 is smoothly performed without being interrupted by the food. A support rod 4 is fixedly mounted on the mounting shelf 3, and an end of the support rod 4 is inserted into a guide hole 9 provided in the heating chamber wall 1a, whereby the door 2 is moved. When opened, the end of the support bar 4 moves along the guide hole 9 so that the mounting shelf 3 is pulled out forward.

A fan cover 10 is mounted outside the portion of the heating chamber wall 1a where the intake / exhaust holes 8 are provided, and a fan 12 is provided in the fan cover 10;
Has its rotating shaft 13 projecting outward through the fan cover 10. Outer position of the fan cover 10, that is,
A heat shield plate 14 is provided upright in the electrical component arrangement space 7, and a motor 15 is mounted outside the heat shield plate 14, and a drive shaft of the motor 15 is a rotation shaft 13 of the fan 12. As described above, since the heat shield plate 14 is provided, heat from the heating chamber 1 side is not blocked by the heat shield plate 14 and does not reach the motor 15, thereby preventing the motor 15 from deteriorating. .

As described above, the air in the heating chamber 1 is sucked into the fan cover 10 from the intake hole 8a and the exhaust hole 8b From the heating chamber 1 again,
Thereby, as shown in FIGS. 1 and 2, hot air circulates in the heating chamber 1 so that the temperature in the heating chamber 1 is substantially constant at any position, and occurrence of burn unevenness is prevented.

Another characteristic configuration relating to prevention of burn unevenness will be described. As shown in FIG. 2, as the back plate 20 having a metal reflecting function used on the back side of the heating chamber, a back plate 20 having a bent shape and a configuration in which each portion 20 a is curved outward is used. I have. Each part 20a
Has a width of about 3 cm in the up-down direction.
0a is curved with a curvature of 7 cmR.

The use of the back plate 20 as described above causes the respective portions 20a to be curved outwardly, so that the light heat from the heaters 5 and 6 to the respective portions 20a is diffused on the surfaces. The light is reflected and spreads throughout the heating chamber 1. In addition, since the reflected light is reflected in different directions by the respective portions 20a, the reflected light heat is diffused and diffused throughout the heating chamber 1. Also in this regard, the temperature inside the heating chamber 1 is kept constant to prevent burning unevenness.

Further, as shown in FIG. 1, the heater 5 is designed so that the output is small on the side far from the intake / exhaust hole 8. In other words, the upper heater 5 has a coiled nichrome wire inside and has a total length of 26 cm, and the portion X having a width of 5 cm on the far side thereof has a pitch twice as large as the other portions. It is wound so that the output of the part, that is, the heating power, is smaller than that of the other parts.

As described above, in the configuration in which the intake / exhaust hole 8 is provided and the air in the heating chamber 1 is circulated, the circulation is inevitably a part deviated to the intake / exhaust port 8 side, and the other side is located on the side farther from the intake / exhaust hole 8. Since the temperature becomes higher than that of the portion, the heater output of the portion is reduced so as to prevent the temperature. In this way, the temperature inside the heating chamber 1 is kept constant to prevent burning unevenness.

In this embodiment, the temperature difference between the front and rear positions and the left and right positions in the heating chamber 1 was measured and found to be as small as about 5 ° C. 30 ° C for conventional products,
It was as large as 15 ° C.

FIG. 4 shows a circuit configuration of the oven toaster. A control unit 50 includes a microcomputer. The control unit 50 includes the upper heater 5, the lower heater 6,
An operation unit 51 is connected to the motor 15 of the fan 12, and the control unit 50 controls the operation of the upper heater 5, the lower heater 6, and the fan 12 based on a predetermined program in response to an input from the operation unit 51. It is supposed to.

The heating operation will be described. As the heating operation mode, there are an automatic toast mode, a high heat mode, a medium heat mode, and a soft (low heat) mode shown in FIG. 5, each of which is selected by an operation on the operation unit 51 and the operation is started by a start operation. [Automatic Toasting Mode] Both the upper heater 5 and the lower heater 6 are continuously operated, and the fan 12 is operated to activate the heating chamber 1
The internal air is circulated. In the automatic toast mode, the toast is heated. [High heat mode] Upper heater 5 is ON for 45 seconds, OFF for 15 seconds
Is repeated, and the lower heater 6 is continuously turned on.
The fan 12 is operated to circulate the air in the heating chamber 1.

In the high heat mode, the mochi, the gratin, and the frozen food exclusively for the oven toaster are heated. [Medium fire mode] Upper heater 5 is ON for 30 seconds, OFF for 30 seconds
Are repeated, and the lower heater 6 is turned off at that timing,
ON is repeated. That is, the heating is performed in a state where one of the heaters is turned on, and the air in the heating chamber 1 is circulated by operating the fan 12.

As a result, as shown in FIG.
The internal temperature is 230 ° C which is the target set temperature as shown by the solid line.
It is a value close to. When the upper heater 5 and the lower heater 6 are simultaneously turned ON / OFF as in the related art, the temperature inside the heating chamber 1 fluctuates between 280 ° C. and 300 ° C. as shown by a dotted line.

In the medium heat mode, butter rolls, croissants and cookies are heated. [Soft mode] Upper heater 5 OFF continuous, Lower heater 6O
With the continuation of N, the fan 12 is operated to circulate the air in the heating chamber 1. As described above, since the heating room air is circulated by the low heat of only the lower heater 6, the food is gradually heated as a whole without excessively heating the surface.

In this soft mode, foods for heating the microwave oven, that is, frozen foods such as frozen pilaf, frozen croquette, and frozen fried food are thawed. The temperature in the heating chamber 1 is about 220 ° C., and thawing is performed on average for about 15 minutes.

[0029]

According to the present invention, by circulating air in the heating chamber, the temperature of the entire heating chamber becomes constant, thereby eliminating burning unevenness.

[Brief description of the drawings]

FIG. 1 is a simplified front view showing the internal configuration of an oven toaster of the present invention.

FIG. 2 is a simplified side view showing the internal configuration of the oven toaster of the present invention.

FIG. 3 is a plan view showing the internal configuration of the oven toaster of the present invention.

FIG. 4 is a circuit diagram of the oven toaster of the present invention.

FIG. 5 is an explanatory diagram of an operation during heating.

FIG. 6 is a graph showing a temperature change during heating.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating room 3 Mounting shelf 5 Upper heater 6 Lower heater 8 Intake / exhaust hole 12 Fan

Claims (7)

[Claims] 1. An oven toaster having an upper heater and a lower heater in a heating chamber and a mounting shelf for heating between the heaters, wherein air is circulated in the heating chamber by operation of a fan. Oven toaster. 2. An oven toaster comprising an upper heater and a lower heater in a heating chamber, and a mounting shelf for heating between the heaters, wherein the wall of the heating chamber is provided with a suction / exhaust hole and is provided outside thereof. An oven toaster characterized in that air is circulated into the heating chamber through the suction / exhaust holes by the operation of the fan. 3. The oven toaster according to claim 2, wherein the air suction and exhaust holes are arranged at non-relative positions of the shelf. 4. The oven according to claim 2, wherein the suction / exhaust hole is provided in the heating chamber wall on the side of the electrical equipment arrangement space so that the suction side is located in front of and behind the intake side. Toaster. 5. The oven toaster according to claim 2, wherein a motor is connected to the fan via a heat shield plate. 6. The oven toaster according to claim 2, wherein the heater has a low output on a side farther from the suction / exhaust hole. 7. The oven toaster of claim 2, wherein an inner surface of the heating chamber wall has a heat diffusing and reflecting configuration.