JP3326336B2 - Oven toaster - Google Patents

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 because the center of the heating chamber is hotter than the right and left sides of the heating chamber, and the front of the heating chamber has a door, so the front of the heating chamber is lower than the rear because of the outside air temperature. 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 present invention , a heating chamber is provided.
And a door mounted on the front of the heating chamber, and the heating chamber
A back plate having a reflection function provided on the back side of the,
An electrical component placement space located on one side of the heating chamber;
An upper heater and a lower heater mounted in a room;
When the door is opened, it is pulled out forward.
And a mounting shelf for food heating adapted to be heated.
The air intake and exhaust holes on the room wall are located at a higher position than the shelf described above.
With the exhaust side in front of and behind the center
And a fan cover is attached to the outside,
A fan is provided in the fan cover, and the heater
By operating the fan when it is hot, the air in the heating chamber
The air is sucked into the fan cover from the intake hole, and
Is discharged into the heating chamber again,
The air is circulated .

[0006] According to the above Symbol of the invention, by air into the heating chamber is circulated, the temperature of the entire heating chamber is constant, thereby burning unevenness is eliminated.

[0007]

In addition, the air intake and exhaust holes are provided in the heating chamber wall on the side of the electrical equipment arrangement space so 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, so that the air sucked from the center of the heating chamber is provided. Is exhausted to both the front and rear sides of the heating chamber, so that the circulation is better performed.

[0009]

[0010]

[0011]

[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 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 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.

Since the back plate 20 as described above is used, first, the respective portions 20a are curved outward, so that the light heat from the heaters 5, 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 air intake / exhaust hole 8 is provided and the air in the heating chamber 1 is circulated, the circulation is inevitably a part deviated toward the air intake / exhaust port 8, and the circulation is other than the air exhaust / 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

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-128655 (JP, A) JP-A-5-288355 (JP, A) JP-A-3-55434 (JP, A) 103105 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24C ⁷ /04-7/06 F24C 7/08 350 F24C 1/00 F24C 15/00

Claims (1)

(57) [Claims] 1. A heating chamber and a heater mounted in front of the heating chamber.
Door and a reflection function provided on the back side of the heating chamber.
Having a back plate and electrical components located on one side of the heating chamber
An installation space, and an upper heater and an upper heater installed in the heating chamber.
Door between the lower heater and the heater
For food heating, which is drawn out forward when
And a mounting shelf , wherein the heating chamber wall on the side of the electrical component placement space has a height higher than the mounting shelf.
The intake and exhaust holes are located at the center of the
Side, and the outside
The fan cover is attached, and the fan cover
Fan is operated when the heater is heated.
This allows the air in the heating chamber to flow from the air inlet to the fan cover.
Into the heating chamber through the exhaust hole.
The oven toaster is characterized in that hot air is circulated in the heating chamber .