KR20090074868A - Oven and using method for the same - Google Patents

Abstract

An oven and a method for use of the same are provided to improve the operating reliability of a grill heater by optimally designing the grill heater which is operated with radiation heating. An oven comprises: a cavity(2) accepting food; a door(3) which selectively opens the cavity; a plurality of heaters heating the cavity. A carbon heater(6) and a halogen heater(7) are mounted on the heater as a grill heater. The heater is protected at the outside of the cavity with a cover(8). A magnetron(4) is mounted on the outside of the upper surface of the cavity to apply a wave heating mode. The electromagnetic wave generated in the magnetron radiates electromagnetic wave to the internal space of the cavity. In the internal space of the cavity, a sheath heater(5) is mounted on the upper side.

Description

Oven and using method for the same}

The present invention relates to an oven. The present invention relates to a method of using an oven. The present invention relates to a method of using an oven in which a heater is optimally installed in an oven and the heater installed therein can be optimally used.

The oven is a device which is provided with a cavity sealed to the outside, and the inside of the cavity is configured to a high temperature environment, to cook food.

These ovens are selectively provided with a grill heater for heating food using radiant heat, a convection heater for heating food using hot air, and a magnetron for heating food using electromagnetic waves. The heaters are operated according to the type of food to be cooked or the specification selected by the user.

The present invention is of primary interest in how the grill heater is applied to the oven.

In particular, the grill heater has a disadvantage that the heating time is longer than other heating devices because the food is cooked by the radiant heating method, the cooking time takes a lot as the heating time is longer, the outside of the cooking time is lost as long as the cooking time Being energy has many disadvantages.

The present invention proposes an oven and a method of using the oven, in which the grill heater is optimally installed and used in the oven, thereby reducing cooking time, reducing power consumption, and increasing heating efficiency, and allowing food to be heated more quickly. .

In addition, the structure is installed by the grill heater operating by the radiant heating method is optimally proposed, the oven and the method of using the oven to improve the operation reliability of the grill heater.

Oven of the present invention, the cavity in which food is accommodated; A carbon heater having a wavelength band of 1.5 to 2.5 μm to which radiant energy is applied and the radiant energy is maximized; And a cover that covers the carbon heater from the outside and has a through hole for cooling.

Oven of the present invention, the cavity; A carbon heater for radiantly heating food contained in the cavity; And at least one other heater selected from a sheath heater, a ceramic heater, and a halogen heater and radiantly heats the food.

A method of using the oven of the present invention is a method of using an oven having a carbon heater and at least one other heater having a wavelength band different from the carbon heater in which the radiant energy is maximized, wherein the carbon heater is turned on. At least some of the time is characterized in that the at least one other heater is turned on.

According to the present invention, while using the grill heater, the food is heated relatively quickly, thereby reducing the cooking time of the food, heat is reduced by the food is quickly heated, power consumption is reduced, heating of the food The efficiency is improved. In addition, since the grill heater is installed in a stable state, it can be expected that the reliability of the operation of the grill heater is improved.

Hereinafter, with reference to the drawings will be described in detail a specific embodiment of the present invention. However, the spirit of the present invention is not limited to the following embodiments, and those skilled in the art who understand the spirit of the present invention can easily add, change, delete, add, etc. other components included in the scope of the same idea. It may be proposed, but this is also included within the scope of the present invention.

<First Embodiment>

1 is a perspective view of an oven according to a first embodiment of the present invention.

Referring to FIG. 1, the oven 1 of the first embodiment includes a cavity 2, a door 3 for selectively opening the cavity 2, and a plurality of heaters that heat the cavity 2. Is mounted.

More specifically, the heater is equipped with a carbon heater 6 and a halogen heater 7 as the grill heater, and the heaters 6 and 7 are protected by the cover 8 outside the cavity. In addition, in order to apply the electromagnetic heating method, the magnetron 4 is mounted outside the upper surface of the cavity 2. Electromagnetic waves generated in the magnetron 4 radiate electromagnetic waves into the interior space of the cavity 2 through a predetermined waveguide and stirrer. In addition, a sheath heater 5 is mounted on the upper side of the cavity. A ceramic heater may be used instead of the halogen heater 7 or together with the halogen heater 7.

The sheath heater 5, the carbon heater 6, and the halogen heater 7 heat the food inside the cavity 2 by a radiant heating method as a grill heater. The heaters have different operations depending on the material of the heater and the heating method. Hereinafter, the heaters will be briefly described.

First, a halogen heater is a kind of incandescent lamp that is a lamp that further suppresses the evaporation of tungsten forming a filament by injecting a halogen material into the glass sphere. In particular, the halogen lamp is manufactured by using a high purity quartz glass pipe having high heat resistance and injecting a halogen element into the quartz glass pipe which suppresses the deterioration of luminous flux and color temperature during use.

In addition, the ceramic heater has a structure in which a heating element is formed in an electrically insulated ceramic body containing silicon nitride (Si ₃ N ₄ ) or aluminum nitride (AlN) as a main component to form resistance heat by current conduction. will be. For example, the heating element is formed of an electrically conductive ceramic composed of silicates, carbonates, borides, or nitrides such as W and Mo, or high melting point metal wires such as Wi, W-Re, and Mo.

In addition, the sheath heater is characterized by being able to be bent or processed in various shapes to ensure safety against physical impact from the outside by winding insulated wires in the metal protective tube at precise intervals and filling the magnesia at high density. It is an electric heater. The sheath heater has been predominantly used as an electric heater of a conventional cooking appliance due to its excellent thermal efficiency, easy installation, large external vibration, high mechanical strength, and strong durability.

In addition, the carbon heater is made of a carbon wire made of carbon fibers of a specific crystal structure as a heating element and encapsulated inside the quartz glass member, and graphitized, so that the carbon wire has excellent resistance stability, particularly resistance with time, during heat generation. It is an electric heater. The carbon wire heating element is excellent in rising and falling temperature characteristics, excellent in high temperature durability, and when produced by twisting a plurality of fiber bundles, it is rich in flexibility made of a solid carbon material, and has various structures and shapes. Advantages of easy processing are also obtained. Therefore, the heater which the said carbon heater enclosed with the non-oxidizing gas in the clean support member, such as a high purity quartz glass member, does not generate | occur | produce particle | grains etc., and its characteristic improves further.

Each type of electric heater used as the grill heater described above has a temperature range suitable for use due to its configuration and characteristics of the heating element. In detail, the sheath heater can be suitably used in a temperature range of about 800 ° C, the ceramic heater can be suitably used in a temperature range of about 1000 ° C, and the halogen heater is suitable in a temperature range of about 2000 ° C. The carbon heater is suitably used in a temperature range of about 1200 ° C. If the use temperature of the electric heaters exceeds the proper temperature range, the heaters, in particular, the heating element is damaged, or the power consumption is high, which is not preferable.

As will be described, the characteristics of the grill heater will be described in more detail.

2 is a graph showing energy absorption rates of cooking objects according to wavelengths.

Referring to FIG. 2, as a result of experiments on major cooking objects such as beef, ham, potatoes, and bread, it is found that the wavelength of about 1.4 to 5 μm having good energy absorption of the main cooking objects is an effective wavelength band of the main cooking objects. Can be.

3 is a graph showing radiation spectra of wavelengths of black bodies having different temperatures. 4 is a graph showing the radiation amount according to the heater surface temperature.

3 and 4, it can be seen that a heater having a heater surface temperature of approximately 1000 to 1400 ° C. is advantageous as a heater having a large amount of radiation in approximately 1.4 to 5 μm, which is an effective wavelength band of a main cooking object. In detail, in FIG. 3, it can be seen that the energy of the wavelength included in the effective wavelength band is the largest in the temperature range of 1000 to 1400 ° C. Referring to FIG. 4, the graph of FIG. It can be seen directly that the energy of the effective wavelength band is large in the temperature range of ~ 1400 ℃.

In addition, referring to the graph showing the radiance according to the wavelength of the carbon heater and the halogen heater shown in Figure 5, the carbon heater in the effective wavelength band (approximately 1.4 ~ 5㎛) of the main cooking object has more radiation than the halogen heater It can be seen.

Based on this, it can be seen that the carbon heater is optimally used as the grill heater.

On the other hand, Table 1 described below shows the surface temperature for each heater according to the cooking target, the temperature rise of the cooking target, and the power consumption cost.

Halo Ceramic Sheath Carbon Heater surface temperature (℃) 2000 1000 900 1200 Temperature rise (△ t ℃), 1200 Cooking target (cooking time) Steak (15 minutes) 31.6 24.2 23.1 26.7 Ham (10 minutes) 27.5 24.9 23.6 30.4 Potatoes (15 minutes) 37.0 34.8 29.2 44.0 Bread (4 minutes) 8.1 22.8 5.1 26.3 Power consumption cost (\ / 1Kw) 8500 8000

Referring to Table 1, in the case of the carbon heater, it can be seen that the temperature rise in the heating cooking for the main cooking object is higher than the other heaters. After all, since there is a lot of energy in the effective wavelength band, it proves that such a large amount of energy was used for cooking food. In addition, if the food is heated quickly, the cooking time of the food is shortened, thereby improving the heating efficiency of the oven, it can be expected that the advantages of increasing the energy consumption efficiency of the oven.

On the other hand, it can be clearly understood that the carbon heater can be used as the optimum heater as described above, but the carbon heater also has a certain range of use temperature, the range of the use temperature Depending on how you set it, the degree of heating of the food can vary.

The inventors of the present invention have found that the wavelength of the point at which the radiant energy emitted from the carbon heater is maximized when the carbon heater is optimally operated is 1.5 to 2.5 μm through a number of experiments. Therefore, in the present embodiment, it is most preferable to operate the carbon heater so that the carbon heater is used and at the same time the wavelength of the point at which the radiant energy of the carbon heater is the maximum is 1.5 to 2.5 占 퐉. The carbon heater 6 applied to) is operated to maximize the radiant energy in the wavelength band.

As already described, the oven of the present embodiment is installed with various types of grill heaters instead of a single grill heater, so that the food is heated in an optimal state. The sheath heater 5, the carbon heater 6, and the halogen heater 7 are exemplified, and a heating method thereof is provided.

The method of using the oven according to the embodiment of the present invention is a method of using an oven in which food is cooked more quickly, cookers eat well, and there is no uneven heating portion of food.

In detail, when the inside of the cavity 2 is in a low temperature state at the beginning of cooking of food, the halogen heater 7 having a high operating temperature is operated so that the inside of the cavity quickly reaches a certain high temperature. When a predetermined time passes after the halogen heater 7 is operated, the carbon heater 6 with good heating efficiency is operated to cook food. Since the carbon heater 6 has a good absorption rate of the cooking object as described above, the heating efficiency of the food will be high and the food will be cooked as quickly.

Subsequently, after the carbon heater 6 is operated to ripen the food to some extent, the sheath heater 5 is operated to color the surface of the food. It is naturally expected that the surface of the food will be light brown, which will make the meal feel better. This is also called browning, and the browning can be smoothly performed by the siege heater 5. 6 shows exactly how to use such an oven as a graph. The browning may also be performed by the magnetron 4.

On the other hand, although not described, it can be considered that all the heaters that can be used in the oven are operated all at once, but operating several heaters at the same time, which consumes a large amount of electricity, may impair the operation stability of the oven and cause an electric accident. It is not preferable because there is concern.

However, in order to realize the optimal operating state, it may be more desirable to allow the other heater to be turned on before one heater is turned off. 6 shows such an operating state.

On the other hand, although not clearly shown in Figure 1, the cover 8 is formed with a through hole in order to allow the carbon heater 6 to operate stably. The through hole serves to prevent the carbon heater 6 from being damaged due to excessively high temperature.

7 is a schematic cross-sectional view of the oven in which the structure of the cover is explained.

Referring to FIG. 7, the cover 8 is provided as a trihedron covering the upper surface of the cavity 2, and each of the three surfaces is formed with a through hole 81. In addition, a perforated cover 82 is provided on an upper surface of the cavity in which the carbon heater 6 is installed. The perforated cover 82 attenuates the influence of the electromagnetic waves generated from the magnetron 4 on the carbon heater 6, thereby preventing the carbon heater 6 from being damaged. The halogen heater 7 is further provided inside the cover 8, but the halogen heater 7 is omitted for convenience of description.

According to such a structure, by forming a separate discharge port in the cavity 2, the outside air can be sucked through the through-hole (81). Since the smoke generated during cooking of the food does not flow to the carbon heater 6 by such an action, it is possible to obtain an advantage that the problem of contaminants sticking to the carbon heater 6 is improved.

According to the above-described embodiment, in addition to having a carbon heater that can cook the grill cooking optimally, in order to perform the grill cooking more quickly in combination with the carbon heater, another type of grill heater is further installed It can be seen that. Due to such a configuration, the cooking time of the grill dish, which required a lot of time in the past, can be drastically shortened, and an advantage of increasing energy use efficiency can be expected. In addition, by controlling the use of the oven for each heating state of the food, the grill can be obtained an advantage that can be performed more quickly and efficiently.

Furthermore, by optimally suggesting a structure in which the carbon heater 6 is installed, contaminants are prevented from adhering to the carbon heater 6 due to convection around the carbon heater, and the perforated cover 82 is formed. It can also be expected that carbon heater durability is improved.

Second Embodiment

In the first embodiment described above, there is a problem that the thermal efficiency of the cavity is lowered due to the inflow of outside air into the cavity. In order to solve this problem, the second embodiment of the present invention blocks the inflow of outside air into the cavity, and the interior space of the cover 8 is cooled by its own cooling flow path which is not related to the cavity. Suggest. However, since most of them are the same as in the first embodiment, the parts without detailed description are referred to the description of the first embodiment.

8 is a schematic cross-sectional view of the oven in which the structure of the cover is explained according to the second embodiment.

Referring to FIG. 8, the ceramic glass cover 83 is further installed in a state of overlapping with the perforated cover 82. The ceramic glass cover 83 serves to partition an inner space surrounded by the cover 8 with respect to an inner space of the cavity 2. In addition, through holes 81 are formed on the left and right sides of the cover 8.

Therefore, the outside air introduced through any one of the through holes 81 cools the carbon heater 6 and then goes out again. Therefore, there is little possibility that external air flows into the cavity 2 and lowers thermal efficiency. In addition, there is no fear that the smoke inside the cavity 2 flows into the inner space of the cover 8 together with the air by the ceramic glass cover 83. Therefore, the carbon heater 6 can be kept clean for a long time.

However, when the ceramic glass cover 83 is applied, the tendency for the radiant light to be absorbed by the ceramic glass cover 83 should be considered.

To verify this, the inventor measured the transmission degree of light to the glass ceramic cover for each grill heater, and the experimental result is shown in FIG. 9.

9, the radiant energy transmission graph 21 of the sheath heater, the radiant energy transmission graph 22 of the ceramic heater, the radiant energy transmission graph 23 of the carbon heater, and the radiant energy transmission graph of the halogen heater ( 24 is shown. Referring to the graph, the sheath heater and the ceramic heater are not preferable because the transmittance is lower than that of the carbon heater. In addition, although the halogen heater has a high transmittance to glass ceramics, since the relative intensity of the radiant energy in the maximum absorption region is weak, the radiant energy actually absorbed into food is not preferable because it is weaker than the carbon heater.

According to this argument, even when the glass ceramic cover 83 is applied, it can be seen that the use of the carbon heater 6 can be optimally used without degrading the thermal efficiency. As a comparative example, when the halogen heater is used, although the overall transmittance is high, it is not preferable because the energy absorbed by the cooking object is weak.

Third Embodiment

According to the second embodiment described above, the effect of increasing the thermal efficiency can be obtained by blocking mutual air flow between the outside of the cavity and the inside of the cavity. However, the heat loss is generated to some extent by the ceramic glass cover as described above.

The third embodiment proposes an embodiment which fundamentally blocks such a problem.

10 is a schematic cross-sectional view of the oven in which the structure of the cover according to the third embodiment is explained.

Referring to FIG. 10, the first cover 85 is extended outside the space where the carbon heater 6 is installed. The second cover 86 is further formed outside the first cover 85 at a predetermined interval. The fan 87 is placed in a space defined by the outside of the first cover 85 and the inside of the second cover 86, and the motor 88 for rotating the fan 87 is the second cover 86. Is further provided on the outside. A suction hole 89 is formed at a position where the suction port side of the fan 87 meets the cavity 2 so that the internal air of the cavity 2 is sucked toward the fan 87.

The operation of the third embodiment having the configuration as described above will be described.

When the oven is operated and cooling of the carbon heater 6 is required, the fan 87 is rotated. By the rotation of the fan 87, the internal air of the cavity 2 is sucked through the suction hole 89, and the air discharged from the fan 87 is provided with a gap between the covers 85 and 86. Through the first cover 85 is introduced into. Air in the inner space of the first cover 85 is circulated through the discharge of the cavity 2.

As described, according to the present embodiment, since the air inside the cavity 2 is circulated with the outside, there is little heat loss. Therefore, it is clear that the heating efficiency is high and the energy consumption efficiency is high.

On the other hand, by installing a filter at any point where air is circulated through the covers 85 and 86, it is possible to obtain an advantage of sufficiently preventing contaminants from adhering to the carbon heater 6.

According to the present invention, even in the radiant heating method, the food is quickly heated, the cooking time of the food is shortened, the heat loss is reduced, the power consumption is reduced, and the heating efficiency of the food is improved. In addition, the installation state of the carbon heater is improved, there is no heat loss, it can be expected that the operation stability is improved.

1 is a perspective view of an oven according to a first embodiment of the present invention.

Figure 2 is a graph showing the energy absorption rate of each cooking object according to the wavelength.

3 is a graph showing wavelength-specific radiation spectra of black bodies having different temperatures.

4 is a graph showing the radiation amount according to the heater surface temperature.

5 is a graph showing radiant luminance according to wavelengths of a carbon heater and a halogen heater.

6 shows a method of using an oven.

7 is a schematic cross-sectional view of the oven in which the cover structure of the carbon heater is explained.

8 is a schematic cross-sectional view of the oven in which the structure of the cover is explained according to the second embodiment;

Fig. 9 is a chart in which light transmission degree to a glass ceramic cover is measured for each grill heater.

10 is a schematic cross-sectional view of the oven in which the structure of the cover is explained according to the third embodiment;

Claims (13)

A cavity in which food is accommodated; A carbon heater having a wavelength band of 1.5 to 2.5 μm to which radiant energy is applied and the radiant energy is maximized; And Oven including a cover for covering the carbon heater from the outside and having a through hole for cooling. The method of claim 1, And the cavity is further equipped with at least one heater selected from a sheath heater, a ceramic heater, and a halogen heater. The method of claim 1, The cavity is further equipped with a magnetron, The carbon heater is mounted to the outside of the cavity, the oven or pores or ceramic glass cover is mounted between the interior space of the cavity and the space in which the carbon heater is mounted. The method of claim 1, Another cover covering the cover in such a way as to provide a gap therebetween; And The gap is provided, the oven includes a fan for sucking the air inside the cavity and blowing to the carbon heater side. Cavity; A carbon heater for radiantly heating food contained in the cavity; And And an at least one other heater selected from a sheath heater, a ceramic heater, and a halogen heater, the radiant heating of the food. The method of claim 5, wherein And the carbon heater and the at least one other heater are covered by the same cover, the cover having a through hole. The method of claim 5, wherein The carbon heater has a wavelength band of 1.5 ~ 2.5㎛ maximum radiation energy, The at least one other heater, And at least one heater having a wavelength band larger than the wavelength band at which the radiant energy of the carbon heater is maximized, and at least one heater having a wavelength band smaller than the wavelength band at which the radiant energy of the carbon heater is maximized. The method of claim 5, wherein The ceramic glass cover is mounted on the interface between the carbon heater and the cavity. The method of claim 5, wherein And the carbon heater and the other heater are operated together at least a part of time in one food cooking. In a method using an oven having a carbon heater and at least one other heater having a different wavelength band from which the radiant energy is maximized with the carbon heater, At least one time during which the carbon heater is turned on, wherein the at least one other heater is turned on. The method of claim 10, And the at least one other heater is selected from a sheath heater, a ceramic heater and a halogen heater. The method of claim 11, The halogen heater is first turned on before the carbon heater is turned on, How to use the oven in which the sheath heater is turned on before the carbon heater is turned off. A cavity in which food is accommodated and cooked; A grill heater placed on an upper surface of the cavity; And A convection heater lying on the back of the cavity is included, The grill heater is a carbon heater oven.

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