JP3469718B2 - Oven toaster - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating control system for an oven toaster. 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. The operation with the power down is usually performed by ON / OFF control of the heater. However, in the related art, since the ON / OFF operation is performed simultaneously by the upper and lower heaters at the same time, the temperature of the heating chamber is turned ON / OFF.
The change occurs in synchronization with the cycle, that is, there is a problem that the temperature is not stabilized at the target set temperature portion, and the heating is not properly performed at the set temperature. If the upper and lower heaters are turned off at the same time, there is also a problem that it is mistaken for a failure when viewed from the outside. 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 provided with a mounting shelf for heating between the heaters, an electrical component placement space located on one side of the heating chamber
And the storage shelf on the side of the heating room
Intake and exhaust holes at a higher position
A fan cover attached to the outside of the part
A fan provided in the fan cover, for sucking air in the heating chamber into the fan cover from the intake hole, discharging the air into the heating chamber again from the exhaust hole, and circulating hot air in the heating chamber, wherein the upper heater includes: The output farthest from the intake and exhaust holes is smaller than the output of the other parts. The fan is operated to circulate the air in the heating chamber, and the upper heater is turned on and off alternately, and the lower heater is turned on in accordance with its timing. The power-down heating is performed by alternately turning OFF and ON. 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, the upper heaters are alternately turned on and off, and the lower heaters are alternately turned off in accordance with the timing.
F, the power down heating is performed by being turned on. According to the above configuration, the power-down heating is performed in a state where one of the upper heater and the lower heater is turned on, so that the heating temperature does not fluctuate much, and the temperature is closer to the set temperature. A power down heating operation is performed. [0008] In addition, it can be easily confirmed that the oven is operating because one of the heaters is operating. [0010] In addition, by having a configuration having a function of circulating air in the heating chamber, the temperature in the heating chamber becomes constant, and uneven burning is eliminated. 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 hole 8 is formed by press-forming the heating chamber wall 1a, and has a central intake hole 8a and 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 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 attached to the outside of the portion of the heating chamber wall 1a where the air intake and 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. Since the back plate 20 as described above is used, first, since the respective portions 20a are curved outward, 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. As shown in FIG. 1, the heater 5 is designed so that the output is smaller 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 air 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 far from the air 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 in a microwave oven, that is, frozen foods such as frozen pilaf, frozen croquette, and frozen fry are thawed. The temperature in the heating chamber 1 is about 220 ° C., and thawing is performed on average for about 15 minutes. According to the present invention, the power-down heating is performed in a state where either the upper heater or the lower heater is turned on, so that the heating temperature does not fluctuate so much. Power-down heating operation at a temperature close to the set temperature becomes possible. Further, there is an advantage that it is possible to easily confirm that the oven is in operation by operating one of the heaters.

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 an oven toaster of the present invention. FIG. 4 is a circuit diagram of the oven toaster of the present invention. FIG. 5 is a diagram illustrating an operation during heating. FIG. 6 is a graph illustrating a temperature change during heating. 3 Mounting shelf 5 Upper heater 6 Lower heater 8 Intake and exhaust holes 12 Fan

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-188996 (JP, A) JP-A-62-268919 (JP, A) 18111 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24C 7/04 301 A47J 37/08 F24C 1/00 360 F24C 7/08 350

Claims (1)

(57) Claims 1. 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, an electrical component arrangement space located on one side of the heating chamber, and a heating chamber wall on the electrical component arrangement space side, which is higher than the above-described shelf.
The air intake / exhaust hole provided at the right position and attached outside the portion where the air intake / exhaust hole is provided
A fan cover and a fan provided in the fan cover, for sucking air in the heating chamber into the fan cover from the air intake hole, discharging the air into the heating chamber again from the exhaust hole, and circulating hot air in the heating chamber, The upper heater has a smaller output than the other portion on the side far from the suction and exhaust holes. The fan is operated to circulate the air in the heating chamber, and the upper heater is alternately turned on and off. An oven toaster characterized in that power down heating is performed by being turned off and on alternately in accordance with timing.