This application claims the benefit of the Korean Application Nos. P2002-0080350 filed on Dec. 16, 2002, P2002-0080351 filed on Dec. 16, 2002, and P2002-0086898 filed on Dec. 30, 2002, which are hereby incorporated by reference.
1. Field of the Invention
The present invention relates to electric ovens, and more particularly, to an electric oven, which has an improved structure for smooth circulation of air inside of the electric oven.
2. Background of the Related Art
In general, the electric oven cooks food, not by burning gas like a gas oven, but by elevating a temperature inside of the oven with electricity or by directing a microwave to food.
The electric oven is favored by consumers in light of no generation of flame, and no gas leakage hazard, leading to cause less accidents coming from negligence of safety than the gas oven.
In the meantime, the electric oven is provided with components, such as the heater and a magnetron, and the like for heating the food. The heater is mounted in an upper side or a lower side of a cooking cavity for heating the food when power is provided thereto. However, since the heater has a very high temperature, the heater may heat, or burn the food locally, when the heater is arranged close to a tray in the cooking cavity. On the other hand, when the heater is arranged far from the tray in the cooking cavity, a failure in proper transmission of the heat from the heater to the food may be caused, to fail proper cooking of the food. Therefore, it is required to improve a structure for efficient transmission of heat from the heater to the food on the tray.
Moreover, since the heater has very high temperature, there is a risk of overheating if the heater is not cooled, effectively. The overheating of the heater is liable to shorten a lifetime of the heater, and cause failure of operation and accidents coming from negligence of safety.
In the meantime, a temperature of the cooking cavity is elevated together with the food by the heater or the microwave generated at the magnetron. Consequently, a temperature of the door of the cooking cavity that receives heat from the cooking cavity is elevated to a high temperature. Because the door is always exposed to the user, it is liable that the user is burned or an accident coming from negligence of safety is taken place, when the door happens to come into contact with the user.
Accordingly, the present invention is directed to an electric oven that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
An object of the present invention is to provide an electric oven, which has an improved structure for uniform transmission of heat from a heater to food in the cooking cavity.
Other object of the present invention is to provide an electric oven, which has an improved structure for preventing overheating of components starting from a heater, effectively.
Another object of the present invention is to provide an electric oven, which has an improved cooling structure for preventing the door from involved in temperature rise due to a cooking cavity temperature.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
To achieve these objects and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, the electric oven includes an outer case, an inner case, a heater cover, at least one heater, a fan housing, and a fan. The outer case has a door mounted in a front part thereof, the inner case in the outer case, and the inner case has a plurality of holes in an upper part thereof. The heater cover in the upper part of the inner case over the holes, and the heater is under the heater cover. The fan housing is attached to an inside wall of the inner case, and has a plurality of apertures. The fan is between the fan housing and an inside wall of the inner case, for drawing air from the cooking cavity and blowing a portion, or all of the air toward the heater.
It is preferable that the heater and the fan housing are arranged opposite to the door. The holes include first holes formed in a part opposite to the door, and second holes between the first holes and the door. The heaters include a first heater arranged over the first holes, and a second heater arranged over the second holes. The first heater may be a halogen heater, and the second heater may be a ceramic heater.
Preferably, the heaters are provided in spaces in communication with each other. The apertures may include a plurality of first apertures in a front surface of the fan housing, and at least one second aperture in an upper surface of the fan housing.
In the meantime, the electric oven further includes third holes in the upper part of the inner case adjacent to the door, a second heater cover over the third holes, and a third heater between the second heater cover and the third holes.
The electric oven may further include at least one fourth heater between the fan housing and the inside wall of the inner case. The fourth heater includes at least one of a sheath grill heater and the ceramic heater.
The electric oven may further include a temperature sensor under the heater cover. In this case the temperature sensor may be arranged to measure a temperature of the halogen heater. In the meantime, the electric oven may further include a fifth heater provided along a space in the upper part of the cooking cavity, when the fifth heater may be a sheath grill heater.
In other aspect of the present invention, there is provided a method for controlling an electric oven for preventing overheating of heaters and a cooking chamber. The method includes making a halogen heater and a ceramic heater to generate heat in starting cooking, the halogen heater and the ceramic heater being provided in an upper part of an inner case having a cooking cavity formed therein, measuring a temperature of the halogen heater, and comparing the measured temperature of the halogen heater and a preset temperature, to make a sheath grill heater in the cooking cavity to generate heat, if the temperature of the halogen heater is lower than the preset temperature, and to cut off power to the sheath grill heater, if the temperature of the halogen heater is higher than the preset temperature.
In another aspect of the present invention, there is provided an electric oven including an outer case having air suction holes and air discharge holes; an inner case, a heater cover, at least one heater, and a fan between the inner case and the outer case. There is a door mounted in a front part of the outer case, and the inner case is provided in the outer case. The inner case has a cooking chamber therein, and a plurality of holes in an upper part thereof. The heater cover is in the upper part of the inner case over the holes, and the heater is under the heater cover. The fan draws air through the air inlet holes and discharges the air through the air outlet holes to cool the inner case and the heater cover.
The air inlet holes are formed at least in a lower part of a front surface of the outer case or a lower part of a rear surface, and the air outlet holes are in an upper part of a front surface of the outer case. The fan is in an upper part of rear of the inner case for drawing air from a lower part and discharging toward a front part.
The holes include first holes formed in a side opposite to the door, and second holes formed between the first holes and the door. The heater includes a first heater over the first holes, and a second heater over the second holes. The first heater is a halogen heater and the second heater is a ceramic heater.
The electric oven may further include at least one partition plate on an upper side of the heater cover for guiding air from the fan so that a flow of the air becomes a plurality of laminar flows. The electric oven may further include at least one partition plate for dividing a space, for an example, on the upper side of the heater cover into a plurality of layers. The at least one partition plate includes a first partition plate spaced a distance away from an upper surface of the heater cover, and a second partition plate spaced a distance away from an upper surface of the first plate. The first partition plate is bent so as to be in conformity with a part of the heater cover. The partition plates have one ends arranged adjacent to the fan, and the other ends arranged adjacent to the air outlet holes.
The electric oven may further include third holes in an upper part of the inner case adjacent to the door, a fan housing over the third holes, and a centrifugal fan between the fan housing and the third holes for blowing air from the cooking cavity to the heaters.
The electric oven may further include a second fan housing attached to an inside surface of the inner case, the second fan housing having a plurality of apertures, a second fan between the second fan housing and an inside wall of the inner case for drawing air from the cooking cavity, and blowing a portion or all of the air toward the heater, and a fan motor between the inner case and the outer case for rotating the second fan. The fan motor is arranged on a suction side of the fan so as to be cooled by the air introduced into the fan through the air inlet holes. The apertures include a plurality of first apertures in a front surface of the fan housing, and at least one second aperture in an upper surface of the fan housing. The electric oven may further include a sheath grill heater in an upper part of the cooking cavity.
In further aspect of the present invention, there is provided an electric oven and a door having an improved structure for preventing overheating. The electric oven includes an outer case, an inner case, a fan between the inner case and the outer case, and a door mounted in a front part of the outer case for opening/closing the door. The outer case has air suction holes and air discharge holes formed therein, and the inner case therein. The inner case has a cooking cavity formed therein, and the fan draws air through the air suction holes and discharges the air through the air discharge holes. The door has an air inlet hole in one side of a door frame for introduction of air circulated by the fan, an air outlet hole in the other side of the door frame for discharging the air to an outside of the electric oven, and an air passage in the door to make the air inlet hole and the air outlet hole in communication.
It is preferable that the air discharge holes are formed right over the door. The fan is arranged in an upper part of rear of the inner case for cooling an outfit chamber in a space between the upper part of the inner case and an upper part of the outer case. The air inlet hole is in an upper side of the door frame, and the air outlet hole is in a lower side of the door frame. The air passage is formed along a rear surface of a plate of glass in a front surface of the door.
It is to be understood that both the foregoing description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention claimed.
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principle of the invention. In the drawings;
Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. In describing the embodiments, identical parts will be given the same names and reference symbols, and repetitive description of which will be omitted.
There is a tray 260 in the inner case 200, i.e., the cooking cavity 250 for placing food to be cooked, and, as shown in
In the meantime, as shown in
The electric oven is operative as follows. When power is provided to the electric oven in a state food is placed on the tray 260, the first to third heaters 410, 420, and 431 generate heat, to heat the cooking cavity 250 in the inner case 200. At the same time with this, when the fan motor 520 is operated, to rotate the centrifugal fan 510, the air is lead from the cooking cavity 250 through the third holes 230 to, and heated at, the first to third heaters 410, 420, and 431. In this instance, the first to third heaters 410, 420, and 431 are cooled down as the first to third heaters 410, 420, and 431 heat exchanges with the air. As shown in
Thus, the electric oven shown in
In the meantime, the first embodiment of the present invention provides a structure for solving the problems.
Referring to
Referring to
In the meantime, as shown in
Referring to
Referring to
Referring to
The fan housing 600 has a plurality of apertures 610 and 620. As shown in
In the meantime, as shown in
Referring to
Referring to
The operation of the electric oven in accordance with a first preferred embodiment of the present invention will be described. For reference,
In the meantime, the fan 710 also rotates as the power is provided to the electric oven. According to this, the air in the cooking cavity 250 is drawn to the fan 710 through the first apertures 610, and discharged through the second apertures 620. The discharged air moves to the first heater 410 through the first holes 210, and heated as the air passes through the first heater 410 and the second heater 420 in succession. Since the heated air moves to the food on the tray 460 in the cooking cavity 250 through the second holes 220, the food receives the heat from the first heater 410 and the second heater 420, more effectively. Moreover, since the air cools the first heater 410 and the second heater 420, overheating of the first heater 410 and the second heater 420 is prevented. If the third heater 430 is provided, the third heater 430 heats the food located adjacent to the door 300, more effectively.
During the process, an air flow passed through the first holes 210 is guided by the heater cover 400. According to this, as shown in
In the meantime, during the cooking, the temperature sensor 490 keeps measuring a temperature of the first heater 410, the halogen heater. The temperature measured by the temperature sensor 490 is transmitted to a controller (not shown), and the controller compares the temperature measured by the temperature senor to a preset temperature, and controls the fourth heater 440, the sheath grill heater, by using a compared value. A process for the controller to control the fourth heater 440 will be described.
If the temperature preset at the controller is 500° C., the controller provides power to the fourth heater 440 if the temperature measured at the temperature sensor 490 is below 500° C. Then, the fourth heater 440 generates heat to elevate the temperature of the cooking chamber 250 to a high temperature, uniformly. This supplements a disadvantage of the halogen heater which generates heat at a high temperature, instantly. That is, though the halogen heater generates heat at a high temperature instantly, the halogen heater can not heat the cooking chamber temperature uniformly, failing to transmit heat to the food uniformly. Therefore, if power is provided to the fourth heater 440, the sheath grill heater, because the fourth heater 440 heats the cooking cavity 250 uniformly, a problem caused when only the halogen heater is used can be solved.
In the meantime, the temperature preset at the controller may be the highest allowable temperature that secures a long lifetime of the first heater 410, the halogen heater. However, the temperature preset at the controller may be temperatures set separately for cooking different kinds of food at optimal conditions.
Opposite to this, if the temperature measured at the temperature senor 490 is higher than 500° C., the controller cuts power to the fourth heater 440, to prevent overheating of the cooking cavity 250, the first heater 410, and the second heater 420. In this instance, the power is kept provided to the first heater 410 and the second heater.
During the cooking is continuous, as shown in
In the meantime, the fifth heater 450, the sheath grill heater, in the electric oven of the present invention can be controlled by the controller so as to be operated identical to the fourth heater 440, or to keep generating heat during the cooking. Meanwhile, different from this, the controller may control the fifth heater 450, and control the fourth heater 440 to keep generating heat during the cooking.
Thus, the electric oven in accordance with a first preferred embodiment of the present invention includes a plurality of heaters provided to different parts of the cooking cavity 250, evenly. The heat from the first heater 260 and the second heater 420 is transmitted to the food on the tray 260, not only by radiation and conduction, but also by convection. Accordingly, the food in the cooking cavity 250 can be heated uniformly.
In the electric oven in accordance with a first preferred embodiment of the present invention, the fan 710 in one side part of the cooking cavity 250 circulates the air through the cooking cavity 250 uniformly, and cools down the heaters. According to this, local heating of the cooking cavity 250, and overheating of the heaters can be prevented.
The method for controlling electric oven of the present invention can prevent local heating of the cooking cavity, and reduce a load on the halogen heater by elevating the cooking cavity temperature uniformly by using the sheath grill heater at the time the temperature of the halogen heater is low at an initial stage of cooking, and also can prevent overheating of the heaters and the cooking cavity by cutting off power to the sheath grill heater when the temperature of the halogen heater is low.
Referring to
The air inlet holes 110, and 120 are either in a lower part of a front surface, or lower part of a rear surface of the outer case 100, or both. The air outlet holes 130 are in an upper part of the front surface of the outer case 100. In this case, the fan 800 is in an upper part of rear surface of the inner case 200, for drawing air through the air inlet holes 110 and 120, and discharging the air through the air outlet holes 130.
The heater cover 400 and the heaters 410 and 420 are provided to positions identical to the embodiment described with reference to
Above structure can prevent overheating of the cooking cavity 250 and the heater cover 400 as the air introduced through the air inlet holes 110, and 120 moves through, and cools a bottom part and a rear part of the inner case 200, as well as the heater cover 400 in the upper part of the inner case 200.
The electric oven may further include at least one partition plate 910, and 920. The partition plates 910, and 920 guide an air flow discharged toward the air outlet holes 130 from the fan 800 and moves to the upper part of the inner case 200 to form a plurality of laminar flows. The partition plates 910, and 920 may be arranged, for an example, to divide a space of the upper part of the heater cover 400.
The first partition plate 910 may be bent in conformity with a part of the heater cover 400 for more efficient reception of heat from the heater cover 400. The partition plates 910, and 920 have one ends adjacent to the fan 800, and the other end adjacent to the air outlets 130. It is preferable that there is a gap between the other ends adjacent to the air outlet holes 130 and the air outlet holes 130 for making respective layers in communication.
If there are the plurality of partition plates 910 and 920 between the heater cover 400 and the outer case 100, air from the fan 800 flows in a laminar form, making heat transfer efficiency better. Moreover, since the partition plates 910 and 920 between the laminar flows transfer a portion of heat of the partition plates 910 and 920 upward, and discharge rest of the heat to an outside of the electric oven through the air outlet holes 130, heat discharge to the outside of the electric oven is progressed faster, thereby cooling the heaters 410 and 420 and the heater cover 400 effectively, to prevent overheating thereof.
In the meantime, the electric oven may further include a centrifugal fan 510 for blowing air from the cooking cavity 250 to the heaters 410 and 420. In this case, the electric oven further includes third holes 230, a fan housing 500, and a centrifugal fan 510. The third holes 230 are in the upper surface of the inner case 200 adjacent to the door 300, and the fan housing 500 is over the third holes 230. One side of the fan housing 500 may be connected to one side of the heater cover 400, to make a lower space of the fan housing 500 in communication with a lower space of the heater cover 400 the heaters 410 and 420 are arranged therein.
If the centrifugal fan 510 is provided thus, the centrifugal fan 510 can blow air from the cooking cavity 250 to the first heater 410 and the second heater 420, and from the first heater 410 and the second heater 420, after being heated, back to the cooking chamber 250, to heat the food. Accordingly, as the first heater 410 and the second heater 420 can be cooled more effectively, overheating of the heaters 410 and 420 can be prevented. Moreover, since heated air is supplied to the cooking cavity 250 and the air in the cooking cavity 250 is drawn again, the air in the cooking cavity 250 circulates, smoothly. According to this, the local heating of the cooking cavity 250 is prevented, and the food can be heated at a uniform temperature.
The operation of the electric oven in accordance with a second preferred embodiment of the present invention will be described, taking a case the centrifugal fan 510 and the partition plates 910 and 920 are provided thereto as an example. When power is provided to the electric oven in a state the food is placed on the tray 260 in the cooking cavity 250, the first heater 410 and the second heater 420 generate heat, and the centrifugal fan 510 rotates. According to this, air is drawn into the centrifugal fan 510 through the third holes 230, blown to the second heater 420 and the first heater 410, heated at the second heater 420 and the first heater 410, introduced into the cooking cavity 250 through the first holes 210 and the second holes 220, and heats the food.
Since the air from the centrifugal fan 510 cools the first heater 410 and the second heater 420, there is no worry of overheating the heaters 410 and 420 and the heater cover 400. Moreover, since the heated air is made to circulate the cooking cavity 250 smoothly by the centrifugal fan 510, the food in the cooking chamber 250 can be heated, uniformly.
At the same time with provision of the power, the fan 800 between the inner case 200 and the outer case 100 also rotates. According to this, the air outside of the electric oven is introduced between the inner case 200 and the outer case 100 through the air inlet holes 110 and 120, and is introduced into the fan 800. In this instance, the air introduced through the air inlet holes 110 in the front surface of the outer case 100 cools bottom surfaces of the inner case 200 and the outer case 100, and the air introduced through the air inlet holes in the rear surface of the outer case 100 cools the rear surfaces of the inner case 200 and the outer case 100. According to this, overheating of the cooking cavity 250 can be prevented, and a large amount of heat transmission from the cooking cavity 250 to an outside of the outer case 100 can be prevented, to prevent accidents caused by negligence of safety.
In the meantime, the air introduced into the fan 800 is discharged into a space between an upper side of the inner case 200 and the outer case 100, and discharged to an outside of the electric oven through the air outlet holes 130. In this instance, the first partition plate 910, and the second partition plate 920 guide the air to be laminar flow. The air flowing between the heater cover 400 and the first partition plate 910 receives heat from the heater cover 400, and transmits a portion of the heat to the first partition plate 910, and discharges rest of the heat to the outside of the electric oven through the air outlet holes 130. A portion of the heat transmitted to the first partition plate 910 is transmitted to the air flowing between the first partition plate 910 and the second partition plate 920, and therefrom to the second partition plate 920, and rest of the heat is discharged to the outside of the electric oven through the air outlet holes 130. A portion of the heat transmitted to the second partition plate 920 is transmitted to the air flowing between the second partition plate 920 and the outer case 100, and therefrom to the outer case 100, and rest of the heat is discharged to the outside of the electric oven through the air outlet holes 130. The heat transmitted to the outer case 100 is transmitted to air in the outside of the electric oven.
Thus, the plurality of laminar flow of the air from the fan 800 to the air outlet holes 130 can transfer or discharge heat quickly. Moreover, the heat exchange of the plurality of partition plates 910 and 920 with the flowing air increases a heat exchange area to make the heat exchange, well. Therefore, since the air from the fan 800 is discharged to the outside of the electric oven after heat exchanging with the partition plates 910 and 920, a temperature of the air discharged from the air outlet holes 130 is not so high. Therefore, there is no hazard of occurrence of accidents caused by negligence of safety coming from direct discharge of hot air to the outside of the electric oven. In addition to this, since the heaters 410 and 420 and the heater cover 400 can be cooled down effectively, reduction of a lifetime of the electric oven caused by overheating of the heaters 410 and 420 can be prevented.
A structure of the electric oven in accordance with a second preferred embodiment of the present invention is not limited to above, but a variation may be embodied in which characteristics of the first embodiment described with reference to
Referring to
The electric oven may further include a third heater 430 for effective heating of the cooking cavity 250 adjacent to the door 300. In this case, the electric oven further includes third holes 230 in the upper surface of the inner case 200 adjacent to the door 300, a second heater cover 470 arranged over the third holes 230, and the third heater 430 between the second heater cover 470 and the third holes 230.
Moreover, the electric oven may further include partition plates 910 and 920 between the heater cover 400 and the outer case 100 for effective cooling of the heater cover 400 and the heaters 410 and 420.
There may be a fifth heater 450 of sheath grill heater in an upper part of the cooking cavity 250, and, though not shown, there may be a fourth heater in the fan housing 600 like the second embodiment. Alike the embodiment in
While descriptions of the components, similar to the descriptions made with reference to
When the power is provided to the electric oven, the first heater 410 and the second heater 420 generate heat to heat the food in the cooking cavity 250. At the same time with this, the second fan 710 draws air from the cooking cavity 250 and supplies the air to the first heater 410 and the second heater 420, to cool the heaters 410 and 420 effectively, and heated air circulates the cooking cavity 250 and heats the food, uniformly. Of course, the third heater 430 and the fifth heater 450 also heated to heat the food uniformly.
In the meantime, the air drawn through the air inlet holes 110 and 120 as the fan 800 rotates cools the bottom sides and rear sides of the inner case 200 and the outer case 100 respectively, as well as cools the fan motor 720 for rotating the second fan 710. The air from the fan 800 is divided into a plurality of laminar flows by the partition plates 910 and 920, and discharged to the outside of the electric oven through the air outlet holes 130. Since the heater cover 400 is cooled effectively in this process, the heater cover 400 and the heaters 410 and 420 are not overheated.
Thus, the electric oven in accordance with the variation of the second embodiment of the present invention has all advantages of the first embodiment and the second embodiment.
Referring to
A space of the outer case 100 over the inner case 200 is used as an outfit chamber 170. As shown in
Referring to
When power is provided to the electric oven, the food on the tray 260 is cooked as the heater 450 is heated. At the same time with this, the fan 800 comes into operation, to introduce an external air into the outfit chamber 170 through the air inlet holes 110. The air introduced into the outfit chamber 170 is discharged after introduced into the fan 800 to cool the magnetron 171 and the transformer 172. As shown in
A temperature of the cooking cavity rises as the cooking progressed, to transmit the heat of the cooking cavity 250 to the door 300. Consequently, since the door 300 can be heated to a high temperature when the food is cooked for a long time period, it is liable that accidents, such a burn of the user, caused by negligence of safety can be taken place. According to this, a structural modification is required, in which the door 300 is cooled for preventing occurrence of the accidents caused by negligence of safety.
The third embodiment of the present invention provides a structure for solving the foregoing problem.
Referring to
Referring to
In the meantime, there is a high frequency shielding plate 370 in the third embodiment door 300 of the present invention for preventing leakage of a microwave to the outside of the electric oven. The high frequency shielding plate 370, provided between the second plate 330 and the third plate 340, has a plurality of holes for the user to see through the cooking cavity 250.
In the meantime, the air inlet hole 351 and the air outlet hole 352 are formed in sides of the door frame 350. For an example, if the air outlet holes 130 for discharging the air from the fan 800 is formed between the door 300 and the front plate 150, the air inlet hole 351 and the air outlet hole 352 are formed in an upper side and a lower side of the door frame, respectively. It is preferable that the air passage making the air inlet hole 351 and the air outlet hole 352 in communication is provided in rear of the front plate 310 of the inside of the door 300 for pass of the air. Because the front plate 310 is exposed to the outside of the electric oven, this is for dropping a temperature of the front plate 310 by direct cooling of the front plate 310 with the air discharged from the fan 800.
In the meantime, since the door 300 has a structure in which inside of the door 300 is empty, with a plurality of plates 320, 330, and 340 of glass arranged therein, no separate formation of the air passage is required, but the empty space in the door 300 serves as the air passage 360 once the air inlet hole 351 and the air outlet hole 352 are formed in side surfaces of the door frame 350. It is preferable that the air inlet hole 351 is formed at a position where the air from the fan 800 is introduced into the door 300 through the inlet hole 351, and moves along a rear surface of the first plate 310.
An air flow in the electric oven in accordance with the third preferred embodiment of the present invention will be described. When the electric oven is put into operation to start cooking, either the microwave from the magnetron 171 in the outfit chamber 170 is directed to the food on the tray 260 in the cooking cavity 250, or the heater 450 heats the food to cook the food. During the electric oven is in operation, the components in the outfit chamber 170 emit heat.
Referring to
Referring to
The third embodiment electric oven of the present invention cools the door with the air that cools the outfit chamber. According to this, the door can be maintained at a safe temperature, to prevent the accidents. Moreover, the air inlet hole and the air outlet hole in the door for cooling the door have very simple structure. Since additional change of structure or addition of component is not required, cost is saved.
The electric oven of the present invention has the following advantages.
In the first preferred embodiment of the present invention, since the fan at one side of the cooking cavity circulates air through the cooking cavity uniformly, local heating of the cooking cavity and the food can be prevented, thereby preventing accidents caused by negligence of safety, and permitting uniform heating of the food.
In the first preferred embodiment of the present invention, the fan at one side of the cooking cavity blows air to, and cools the heaters, to prevent overheating of the heater. According to this, accidents caused by negligence of safety coming from overheating of the heaters and heater cover can be prevented, and reduction of a lifetime of the heaters can be prevented.
By elevating the temperature of the cooking cavity uniformly with the sheath grill heater when the temperature of the halogen heater is low in an initial cooking process, the method for controlling an electric oven of the present invention can prevent local heating of the cooking cavity, and reduce a load on the halogen heater. The cutting off of the power to the sheath grill heater when the temperature of the halogen heater is low, overheating of the heaters and the cooking cavity can be prevented.
The electric oven in accordance with the second preferred embodiment of the present invention prevents overheating of the cooking cavity and the heaters, because the air circulated by the fan between the inner case and the outer case cools all the bottom sides, rear sides, and upper sides of the inner case and the outer case. According to this, occurrence of the accidents caused by negligence of safety, and reduction of a lifetime of the heaters can be prevented.
In the second preferred embodiment of the present invention, the partition plates provided to the upper part of the heater cover cools upper sides of the heater cover and the inner case, effectively. According to this, occurrence of the accidents caused by negligence of safety, and reduction of a lifetime of the heaters can be prevented.
The variation of the second preferred embodiment of the present invention has the advantages both of the first and second embodiments.
The electric oven in accordance with the third preferred embodiment of the present invention can prevent accidents caused by negligence of safety coming from overheating of the door, because the door is cooled by the air which cools the outfit chamber.
According to the third preferred embodiment of the present invention, what is required for cooling the door is formation of the air inlet hole and the air outlet hole in sides of the door. According to this, since no separate structural change and no addition of components are required, safety of the product can be enhanced with a low cost.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Number | Date | Country | Kind |
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10-2002-0080350 | Dec 2002 | KR | national |
10-2002-0080351 | Dec 2002 | KR | national |
10-2002-0086898 | Dec 2002 | KR | national |
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