KR100213947B1 - Toaster of even heating - Google Patents

Abstract

The oven toaster has a loading shelf for heating between the upper heater and the lower heater and the heater in the heating chamber. At the same time, an intake and exhaust hole is provided in the wall of the heating chamber, and air is circulated through the intake and exhaust hole into the heating chamber by a fan operation provided outside thereof, thereby preventing the occurrence of burning unevenness.

Description

Toaster with oven function for even heating

The present invention relates to a toaster having an oven function, and more particularly, to a toaster having an oven function in which a heated object is uniformly heated.

The oven toaster generally has a loading shelf for loading the heated object installed between the upper heater and the lower heater and the upper and lower heaters installed in the heating chamber. Usually, since the upper space becomes wider than the lower side of a loading shelf in a heating chamber, an upper heater is output higher than a lower heater, and the baking nonuniformity is prevented by this.

However, in reality, baking unevenness is occurring. This is because the center side is hotter than the left and right sides in the heating chamber, and the front side of the heating chamber has a door, so the front side in the heating chamber affected by the outside temperature is colder than the rear side. I'm doing it for a reason. Of course, in consideration of the above, the arrangement of the heater, the design of the heater output, and the like are performed. However, the occurrence of the baking unevenness cannot be completely prevented.

Therefore, one object of the present invention is to reliably prevent baking unevenness of a heated object in a toaster having an oven function.

Another object of the present invention is to make the ambient temperature distribution of the heated object uniform in a toaster having an oven function.

Still another object of the present invention is to reliably circulate heated air in a toaster having an oven function.

Another object of the present invention is to uniformize the temperature distribution in the heating chamber in a toaster having an oven function.

Still another object of the present invention is to provide good heating in a state where the output is lowered in a toaster having an oven function.

1 is a schematic front view showing the internal configuration of the oven toaster of the present invention.

Figure 2 is a schematic side view showing the internal configuration of the oven toaster of the present invention.

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

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

5 is a diagram for explaining an operation during heating;

6 is a graph showing changes in temperature during heating;

Explanation of symbols for the main parts of the drawings

1: heating chamber

3: loading shelf

5: upper heater

6: lower heater

8: intake and exhaust holes

12: fan

This object of the invention is achieved by a toaster having an oven function comprising the following elements. That is, the toaster which has an oven function which concerns on this invention has an oven function which has a loading shelf for loading the to-be-heated object provided between the upper heater, the lower heater, and the said upper and lower heaters installed in the heating chamber.

The heating chamber has an opening / closing door provided in a second direction crossing the first direction in which the vertical heater extends in the longitudinal direction.

The toaster includes at least a fan installed at one end in the first direction between the upper heater and the loading shelf, whereby air in the heating chamber is circulated. At least, a fan is provided at an end portion in the heater longitudinal direction between the upper heater and the loading shelf, whereby the air in the heating chamber is circulated, so that the temperature in the heating chamber is uniform in the longitudinal direction of the heater. As a result, the baking nonuniformity of a to-be-heated object is reliably prevented.

Preferably, the space between the upper heater and the loading shelf forms a heated space, a partition wall is provided between the heated space and the fan, and the partition wall is provided with a hole for the intake and exhaust air.

The intake and exhaust holes include an intake hole provided in the center portion and an exhaust hole provided around the intake hole.

The intake and exhaust holes are provided on the wall of the heating chamber on the electrical component placement space side so that the intake side is located at the center of the intake side and before and after the air intake. This is done better.

More preferably, the motor is connected to the fan via a heat shield plate. As a result, heat from the heating chamber side is blocked by the heat shield plate and heat weakening of the motor is prevented.

More preferably, the heater is output low at the side away from the intake and exhaust holes, so that the circulation of air in the heating chamber is less, and the side which is likely to become a high temperature is not heated by the heater so much, so that the temperature of the entire heating chamber is constant. Baking unevenness is eliminated.

More preferably, the inner surface of the heating chamber wall has a diffuse reflection configuration of heat, whereby the heat from the heater is diffusely reflected into the heating chamber, whereby the temperature of the entire heating chamber is constant and the burning unevenness is eliminated.

More preferably, the upper heaters are alternately turned on and off, while the lower heaters are alternately turned off and on in accordance with the timing, thereby lowering the output.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 3, the toaster having an oven function according to the present invention has a heating chamber 1, and a door 2 is mounted on the front thereof. The loading shelf 3 for food heating is provided below the center height position in the heating chamber 1. Rod-shaped upper heaters 5 (850W) and lower heaters 6 (500W) are attached to each of the ceiling surface and the bottom surface of the heating chamber 1.

The electrical equipment placement space 7 is located in one side of the heating chamber 1, and the intake / exhaust hole 8 is provided in the heating chamber wall 1a by the side of the electrical equipment placement space 7 side. This intake and exhaust hole 8 is formed by press-forming the heating chamber wall 1a, and is composed of an intake hole 8a at the center and an exhaust hole 8b before and after it. As described above, the intake hole 8a is provided with the exhaust hole 8b before and after the center, so that the circulation of air accompanying the intake and exhaust gas is performed without biasing the entire interior of the heating chamber 1.

In addition, the position where the intake / exhaust hole 8 is provided is a position about 2 cm higher than the position of the loading shelf 3. In this way, even when food, such as a toaster, is loaded on the loading shelf 3, the intake and exhaust operation in the intake and exhaust hole 8 is smoothly performed without being blocked by the food. Moreover, the supporting rod 4 is attached to the loading shelf 3 in a fixed state, and the door 2 is closed by inserting the end of this supporting rod 4 into the guide hole 9 provided in the heating chamber wall 1a. When opened, the end of the supporting rod 4 moves along the guide hole 9 so that the stacking shelf 3 can be pulled forward.

A fan cover 10 is attached to the outside of the portion where the intake and exhaust holes 8 of the heating chamber wall 1a is installed, and a fan 12 is installed in the fan cover 10, and the fan 12 has its rotating shaft. 13 protrudes outward through the fan cover 10. A heat shield plate 14 is provided at an external position of the fan cover 10, that is, the electrical equipment placement space 7, and a motor 15 is attached to the outside of the heat shield plate 14, and the drive shaft of the motor 15 is provided. The rotary shaft 13 of the fan 12 is used. As described above, since the heat shield plate 14 is provided, heat is blocked from the heating chamber 1 side by the heat shield plate 14 so that the heat is not applied to the motor 15, thereby preventing deterioration of the motor 15.

As described above, the intake and exhaust holes 8 and the fan 12 are provided so that the fan 12 is operated at the time of heating so that the air in the heating chamber 1 is sucked into the fan cover 10 from the intake hole 8a and exhausted. It is discharged from the hole 8b into the heating chamber 1 again, and as a result, as shown in FIG. 1 or 2, the heat is circulated in the heating chamber 1, and the temperature in the heating chamber 1 is at any position. It becomes almost constant and the occurrence of baking unevenness is prevented.

Another characteristic configuration regarding the prevention of baking unevenness will be described.

As shown in Fig. 2, as the back plate 20 having a metal reflective function used on the rear side of the heating chamber, a bent shape is used, and a structure in which each portion 20a is curved outward is used. The width | variety in the up-down direction of each part 20a is about 3 cm, and the part 20a is curved by the curvature of 7 cmR.

By using the back plate 20 as described above, first, since each portion 20a is bent to the outside, light heat reaching the respective portions 20a from the heaters 5 and 6 is diffusely reflected from the surface and heated. Spreads throughout the chamber 1. In addition, since each part 20a is reflected in a different direction, the reflected light heat enters a diffuse reflection state and shines into every corner of the heating chamber 1. Also in this point, the temperature in the heating chamber 1 is kept constant, and baking unevenness is prevented.

In addition, as shown in FIG. 1, the heater 5 is designed so that an output from the intake and exhaust hole 8 becomes smaller. In other words, the upper heater 5 is provided with a nichrome wire in a coil state therein and its total length is 26 cm. However, the 5 cm wide portion X has a pitch twice that of the other portions. As a result, the output of the portion, that is, the heating power, is smaller than that of the other portion.

As described above, in the configuration in which the intake and exhaust holes 8 are provided and the air in the heating chamber 1 is circulated, the circulation is necessarily a portion biased toward the intake and exhaust hole 8 side, and farther than the other part from the intake and exhaust hole 8 side. Since the temperature is high, the heater output of the portion is lowered to prevent it. In this way, the temperature inside the heating chamber 1 is also kept constant to prevent uneven burning.

In the case of this embodiment, when the temperature difference of each of the front-back position and the left-right position in the heating chamber 1 was measured, all were small about 5 degreeC. In the prior art, it was large at 30 ° C or 15 ° C.

4 is a block diagram showing a circuit configuration of an oven toaster.

Referring to Fig. 4, the circuit main part of the oven toaster includes a controller 50 constituted by a microcomputer. The control unit 50 is connected to the motor 15 of the fan 12 of the upper heater 5, the lower heater 6, and an operation unit 51. In response to an input from the operation unit 51, the control unit 50 controls the upper heater 5, the lower heater 6, and the fan 12 based on a predetermined program.

The heating operation will be described. As the heating operation mode, there are the automatic toast mode, the high light mode shown in Fig. 5, the medium light mode, and the soft (low light) mode, respectively, and the operation is performed by pressing the start button, which is selected by the operation on the operation unit 51 and not shown. This is disclosed.

[Auto Toast Mode]

Both the upper heater 5 and the lower heater 6 continue to operate, and the fan 12 is operated to circulate air in the heating chamber 1. In this automatic toast mode, the heating of the toast is performed.

[Senbulk Mode]

The upper heater 5 is repeatedly turned on for 45 seconds and 15 seconds off, and the lower heater 6 is turned on continuously, and the fan 12 is operated to circulate air in the heating chamber 1.

In this high heat mode, of course, heating of the frozen food for exclusive use of the granite or the oven toaster is performed.

[Mid Light Mode]

The upper heater 5 repeats 30 seconds ON and 30 seconds OFF, and the lower heater 6 repeats OFF and ON at that timing. In other words, the heater is heated while the heater is turned on, and the fan 12 is operated to circulate air in the heating chamber 1.

That is, since heating lowered the output while the heater of either the upper heater or the lower heater is turned ON, the heating temperature does not fluctuate so much, and the heating operation lowering the output at a temperature closer to the set temperature becomes possible. .

In addition, since either heater is operating, there is an advantage that can easily confirm that the oven is in operation.

By heating as mentioned above, as shown in FIG. 6, the temperature in the heating chamber 1 becomes a numerical value near 230 degreeC which is a target set temperature as shown with a solid line. As in the prior art, when the upper heater 5 and the lower heater 6 are simultaneously turned on and off, the temperature in the heating chamber 1 rises and falls between 280 ° C and 300 ° C as indicated by the dotted line.

In this medium fire mode, butter rolls, croissant pairs, and cookies are heated.

[Soft mode]

The upper heater 5 is OFF, the lower heater 6 is ON, and the fan 12 is operated to circulate air in the heating chamber 1. In this manner, with the low heat of the lower heater 6 alone, the air in the heating chamber is circulated, and the whole food is gradually heated without the surface being excessively heated.

In this soft mode, defrosting of foods for microwave heating, i.e., frozen foods such as frozen pilaf, frozen croquettes and frozen fry is performed. The temperature in the heating chamber 1 is thawed at about 220 ° C. for about 15 minutes on average.

Since the heating is performed after the output is lowered while the heater of either the upper heater or the lower heater is turned on, the heating temperature does not fluctuate so much, and the heating operation is lowered at a temperature closer to the set temperature.

Claims (9)

A toaster having an oven function having an upper heater installed in a heating chamber, a loading shelf for loading a heated object installed between the lower heater and the upper and lower heaters, The heating chamber has a door for opening and closing provided in a second direction crossing the first direction in which the vertical heater extends in the longitudinal direction, And at least one fan provided at one end in said first direction between said upper heater and said loading shelf, whereby air in said heating chamber is circulated. The space between the upper heater and the stacking shelf forms a heated space, a partition wall is installed between the heated space and the fan, and the partition wall is provided with a hole for an intake and exhaust air vent. Toaster with oven function. 3. The toaster according to claim 2, wherein the intake and exhaust holes include an intake hole provided in the center portion and an exhaust hole provided around the intake hole. The toaster having an oven function according to claim 2, wherein the intake and exhaust holes include an intake hole provided in a central portion and an exhaust hole provided in a position shifted in the second direction with respect to the intake hole. The toaster having an oven function according to claim 1, wherein a heater is connected to the fan via a heat shield plate. The toaster having an oven function according to claim 1, wherein the output of the upper and lower heaters is set smaller as the other side is different from the first direction. The toaster of claim 1, wherein the wall surface of the heating chamber diffuses and reflects heat. The toaster of claim 1, wherein the upper heater is alternately turned on and off, and the lower heater is controlled to be turned off and on in conjunction with the lower heater. The toaster having an oven function according to claim 1, wherein the switching of ON and OFF is a 30 second cycle.

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