JP2674210B2 - Cooking device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a cooking device with an electric heating device.

2. Description of the Related Art Conventionally, in an electric heating device with an electric heating device, both the upper heater and the lower heater are placed near the center of rotation of the turntable, and the turntable is rotated during microwave oven cooking, but the turntable is rotated during heater heating cooking. Although a heating and cooking device that does not allow it to be used is often used, there are many problems such as uneven burning easily occurring on the upper and lower surfaces of the food, and because the heater is relatively close to the door and the door easily overheats.

In addition, the reflection plate for the upper heater has a C-shaped cross section, and the lower heater is often a plate heater in which a ribbon-shaped heater wire is insulated with a mica plate. There were also problems such as the time tending to be long.

 A conventional example will be described below with reference to FIG.

As shown in the figure, a door 2 is provided so that the heating chamber 1 is almost sealed. Inside the heating chamber 1, a tubular upper heater 3 is provided. A reflection plate 5 for the upper heater is provided above the oven 4 so as to radiate the heat of the upper heater 3 to the food 6 in the heating chamber 1. On the lower surface of the oven bottom plate 7, a plate-shaped lower heater 8 in which a ribbon-shaped heater wire is insulated with mica is attached. The heat is transferred to the food 6 in the heating chamber 1 by radiation and convection. The food 6 is placed on the turntable 9. The oven 4 is surrounded by an upper shroud 10 and a lower shroud 11. 12 is a foot. Upper heater 3 and lower heater 8
Is also arranged near the center of rotation 13 of the turntable 9. The turntable 9 is rotated during electric range cooking, but is not rotated during heater heating cooking.

However, in this structure, the upper heater 3,
Since the lower heater 8 is arranged near the rotation center 13 of the turntable 9 and does not rotate the turntable 9, problems such as uneven burning easily occur on both the upper and lower surfaces of the food 6 and the door 2 easily overheats. there were.

Further, since the reflection plate 5 for the upper heater has a C-shaped cross section, and the lower heater 8 is a plate-shaped heater in which ribbon-shaped heater wires are insulated with mica, the temperature inside the refrigerator rises slowly and the cooking time tends to be long. There was a problem such as.

Therefore, it is a first object of the present invention to provide a heating and cooking apparatus that improves the uneven burning of food such as toast and has a small temperature rise of parts such as doors.

A second object of the present invention is to provide a heating and cooking device that can quickly raise the temperature inside the refrigerator and shorten the cooking time.

A third object of the present invention is to provide a heating and cooking device in which the temperature inside the refrigerator rises quickly, the cooking time can be shortened, and the unevenness of the bottom surface of the food is further improved.

A fourth object of the present invention is to provide a heating and cooking device which reduces the temperature rise of the turntable motor and improves the uneven burning of the lower surface of the food.

A fifth object of the present invention is to provide a heating and cooking device in which the heat efficiency when the heat of the upper heater is transferred to the food is improved and the uneven burning of the upper surface of the food is improved.

Means for Solving the Problems To achieve the above object, the present invention provides an oven for heating and cooking food, an upper heater, a lower heater provided outside the open, a turntable on which food is placed, and the lower portion. A reflector surrounding the heater, both heaters being provided behind the center of rotation of the turntable, and an oven bottom plate facing the reflector being painted black.

Further, in the above, a part of the black coating on the oven bottom plate near the lower heater is removed or the film thickness is reduced.

Further, the present invention has an oven for heating and cooking food, an upper heater, a lower heater provided outside the oven, a turntable on which the food is placed, and a reflection plate surrounding the lower heater. The heater is provided behind the rotation center of the turntable, and one end of the reflector is near the turntable, and the inclination of the reflection surface toward the center of the turntable is larger than the reflection surface from the bottom to the end of the turntable. The reflector is configured so that the corners are loosened.

Further, in the above-mentioned structure, an upper heater reflection plate surrounding the upper heater is provided, and the reflection plate has a parabolic cross section, and the center of the upper heater is deviated by a predetermined distance to expand the reflected heat ray above the focus of the parabola. It has been arranged.

Action The heating and cooking device of the present invention is provided with a tubular lower heater surrounded by a reflection plate outside the oven, and both the upper heater and the lower heater are centered off rearward so that the distance from the door is increased. Suppresses the temperature rise of parts such as
In addition, the uneven burning of food can be improved in combination with the rotation of the turntable.

In addition, in the heating and cooking device where the part of the oven bottom plate facing the lower heater reflection plate is painted black, the black paint absorbs the heat from the bottom heater well and heats the oven bottom plate well, so the temperature inside the oven rises quickly. , The cooking time can be shortened.

Also, in the cooking device with the black coating on the part of the oven bottom plate facing the lower heater reflection plate removed or the film thickness is thinned, only the temperature of the part of the oven bottom plate near the heater drops. Therefore, it is possible to improve the uneven burning of the lower surface of the food while keeping the temperature inside the refrigerator rising quickly.

Further, in the heating and cooking device in which the two reflecting surfaces of the lower heater reflecting plate have different inclinations, ventilation of the turntable motor is improved, so that the temperature rise of the turntable motor can be suppressed to a low level. In addition, since it is possible to heat the vicinity of the rotation center of the turntable on the bottom plate of the oven, it is possible to improve the uneven burning of the lower surface of the food.

In addition, the heating cooker in which the cross section of the reflector for the upper heater has a parabolic shape and the center line of the tube of the upper heater is above the focus of the parabola, the heat from the upper heater is
Since it does not repeat a plurality of times with the reflecting plate and the beam is appropriately expanded, it is possible to improve the thermal efficiency and improve the uneven burning on the upper surface of the food.

Example Hereinafter, a heating and cooking apparatus in an example of the present invention will be described with reference to the drawings.

As shown in FIG. 1, a door 15 is provided so as to substantially close the heating chamber 14. Inside the heating chamber 14, a tubular upper heater 16 is installed by a conventional technique. On the upper part of the oven 17, a reflector plate 18 for the upper heater is provided so that the cross section of the reflection surface is parabolic so that the heat of the upper heater 16 is radiated to the food 19 in the heating chamber 14. Below the oven bottom plate 20, a tubular lower heater 21 similar to the upper heater 16 is provided. A lower heater reflection plate 22 is attached to the oven bottom plate 20 so as to surround the lower heater 21. The heat generated by the lower heater 21 is either direct radiation or a reflector for the lower heater.
Reflecting at 22, the oven bottom plate 20 is heated mainly by radiation, and the heat of the oven bottom plate 20 is heated by radiation and convection in the heating chamber 14
Introduced to food in 19. The food 19 is placed on the turntable 23. The oven 17 is surrounded by an upper shroud 24 and a lower shroud 25. 26 is a foot. The turntable 19 is driven by a turntable motor as is conventionally done, and rotates about a rotation center 27 as an axis.

Both the upper heater 16 and the lower heater 21 are arranged so as to be displaced rearward from the rotation center 27 of the turntable motor (in a so-called center-off state).

The reflecting surfaces of both the upper heater reflecting plate 18 and the lower heater reflecting plate 22 are so-called mirror-finished with high reflectance.

FIG. 2 clarifies the positional relationship between the upper heater 16, the upper heater reflection plate 18, the lower heater 21, and the lower heater reflection plate 22 with respect to the rotation center 27 of the oven 17 and the turntable motor in this embodiment. Note that illustration of other objects is omitted in FIG.

Next, referring to FIG. 3, three embodiments of the oven bottom plate will be described.

As shown in FIG. 3A, the lower heater reflection plate 22 is attached to the oven bottom plate 20, but the oven bottom plate 20 is not particularly painted. Reference numeral 21 is a lower heater, and 28 is a rotary shaft hole of the turntable. This is the first embodiment of the oven bottom plate.

The oven bottom plate 20 shown in FIG. 3 (b) is obtained by applying a black coating 29 to the oven bottom plate 20 facing the lower heater reflection plate. Due to the black paint 29, the heat from the lower heater is well transferred to the oven bottom plate 20. This is the second embodiment of the oven bottom plate.

On the oven bottom plate 20 shown in FIG. 3 (c), the black paint 29 is applied to the oven bottom plate 20 facing the reflector for the lower heater, but the part 30 near the lower heater of the oven bottom plate 20 is not painted black. Alternatively, the coating film thickness is made thin, and it is possible to prevent the portion near the lower heater of the oven bottom plate 20 from being locally overheated while leaving the goodness of FIG. 3 (b). This is the third embodiment of the oven bottom plate.

Next, referring to FIG. 4, an embodiment of the lower heater reflection plate will be described. The lower heater reflection plate 22 for reflecting the heat generated from the tubular lower heater 21 is formed of a stainless steel plate whose reflection surface is a mirror finish. On the side closer to the turntable motor, a reflecting surface 31 having a gentle angle with respect to the surface of the oven bottom plate is provided, and on the side far from the turntable motor, a reflecting surface 32 having a steep angle with respect to the surface of the oven bottom plate is provided. Further, the reflecting surface 33 parallel to the oven bottom plate is provided with a recess 34 for reinforcement and for ensuring a distance from the lower heater 21 in terms of safety. Moreover, the left and right ends of the lower heater reflecting mirror 22 have a heavenly left end reflecting surface 35 and a right end reflecting surface.
36 is provided. The through-hole 37 for penetrating the shaft of the turntable motor is required and is provided in the minimum size. The penetrating portion 37 is formed by a small reflecting plate 38. Left flange 39, right flange around the lower heater reflector 22
40 is provided so as to extend parallel to the surface of the oven bottom plate for attachment to the oven bottom plate and prevention of escape of hot air from the lower heater 21. Further, the front flange 41 and the rear flange 42 are provided so as to extend in parallel with the surface of the oven bottom plate in order to prevent the hot air from the lower heater 21 from escaping. The reflection plate 22 for the lower heater is attached to the bottom plate of the oven so that the hot air from the lower heater 21 does not escape as much as possible, or the gap is reduced as much as possible.

Next, referring to FIG. 5, a description will be given of the path of reflection of heat rays from the lower heater when the implementation of the lower heater reflection plate described with reference to FIG. 4 is used.

In the figure, the lower heater reflection plate 22 is attached to the oven bottom plate 20 so as to surround the lower heater 21. The shaft 43 of the turntable motor is provided so as to rotate about the rotation center 27 of the turntable as an axis. Three of the heat rays from the lower heater 21 reflected by the reflection surface 31 at a gentle angle are indicated by arrows, but three of the heat rays from the lower heater 21 reflected by the reflection surface 32 at a steep angle are indicated by arrows. Compared with the one shown, it can be seen that the heat rays reflected by the reflection surface 31 having a gentle angle reach a greater distance from the lower heater 21. The reflection of heat rays can be considered according to the law of reflection of light rays reflected so that the incident angle and the reflection angle are equal. By providing the reflection surface 31 having a gentle angle in this way, it is possible to sufficiently heat the vicinity of the rotation center 27 of the turntable.

FIG. 5 also shows that the turntable motor 44 is better cooled. Conventionally, cooling air is passed near the turntable motor to suppress temperature rise,
In the case of the present embodiment, since the reflection surface 31 having a gentle angle does not block the cooling air path of the turntable motor 44, the cooling is sufficiently performed.

Next, referring to FIG. 6, an embodiment of the reflector for the upper heater will be described.

As shown in FIG. 6, the upper heater reflection plate 18 is made of a mirror-finished stainless sheet metal so that its reflection surface has a parabolic cross section. The center line 46 of the tubular upper heater 16 with respect to the focal point 45 of the parabola is displaced by a distance d toward the reflecting surface side. According to the experiment, the shift amount d is 5% to 3% of P (particularly preferable is 10% to P when the focal length is P).
20%) was desirable. The above value varies depending on the distance L from the upper heater 16 to the turntable surface (strictly, food). In the case of the above value, the distance L from the upper heater 16 to the turntable surface is about 8 times P. is there. Distance L from the upper heater 16 to the turntable surface
In the case where is changed, the shift amount d may be set approximately in proportion to L.

If the center line 46 of the heater 16 is placed at the focal point 45 of the parabola, as shown in FIG. 7 (a), the beam 47 of the heat rays reflected by the upper heater reflection plate 18 into the oven 17 is shown. Is narrow enough to have the width of the upper heater reflection plate 18, and as shown in FIG. 8 (a), in the food 19 such as toast, only the shaded portion is strongly heated and uneven burning occurs. However, in the case of the embodiment shown in FIG.
Since the center line 46 of the upper heater 16 is displaced from the focal point 45 of the parabola toward the reflecting surface side, the beam 48 into the oven 17 is diffused as shown in FIG. 7 (b), As shown in FIG. 8 (b), the food 19 also has extremely little unevenness in burning.

Since the reflecting surface of the upper heater reflecting plate 18 is a parabola, heat rays from the upper heater 16 do not repeat reflection on the upper heater reflecting plate 18 a plurality of times, and heat loss can be suppressed to an extremely small level.

EFFECTS OF THE INVENTION As described above, in the cooking device according to claim (1), the tubular lower heater surrounded by the reflection plate is provided outside the oven, and both the upper heater and the lower heater are centered off rearward. The distance from the door is increased, and the temperature rise of parts such as the door can be suppressed. In addition, the uneven burning of food can be improved in combination with the rotation of the turntable.

In the cooking device of claim (2), the portion of the oven bottom plate facing the reflector for the lower heater is painted black so that the black coating absorbs heat from the lower heater well. Since it is heated, the temperature inside the refrigerator rises extremely quickly, and cooking time can be shortened.

Further, in the heating and cooking device according to claim (3), of the black coating of the portion of the oven bottom plate facing the lower heater reflection plate, the portion of the black coating near the lower heater is removed or the thickness of the oven bottom plate is reduced. It is possible to prevent only a portion near the lower heater from being locally overheated, the temperature of the inside of the refrigerator rises quickly, and uneven burning on the lower surface of the food can be improved.

Further, in the heating and cooking device according to claim (4), since the two reflecting surfaces of the lower heater reflecting plate have different inclinations, the airflow to the turntable motor is improved and the temperature rise of the turntable motor is suppressed. You can Further, the heat ray from the lower heater reaches the vicinity of the center of rotation of the turntable sufficiently, and the unevenness of burning on the lower surface of the food can be further improved.

Further, in the heating and cooking device according to claim (5), the reflector for the upper heater has a parabolic cross section, and the center line of the tube of the upper heater is located above the focal point of the bullet line. The heat from the upper heater is not repeatedly reflected by the reflector multiple times, and the thermal efficiency can be improved. Further, the beam of reflected heat rays spreads appropriately, and the uneven burning on the upper surface of the food is remarkably improved.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a heating and cooking device according to an embodiment of the present invention, FIG. 2 is a perspective view of the same, and FIG. 3 (a) is a front view of the main part of an oven bottom plate according to one embodiment of the present invention. FIG. 4 (b) is a front view of an essential part of an oven bottom plate according to another embodiment of the present invention, FIG. 4 (c) is a cross-sectional view of the essential part of an oven bottom plate according to another embodiment of the present invention, and FIG. FIG. 5 is a perspective view of a reflector for a lower heater according to an embodiment of the invention, FIG. 5 is a sectional view of a main part of the reflector for a lower heater according to an embodiment of the present invention, and FIG. 6 is an upper heater according to an embodiment of the present invention. FIG. 7 is a cross-sectional view of an essential part of a reflector for use in a heat ray beam of an upper heater according to an embodiment of the present invention, and FIG. 8 is an explanatory view for improving unevenness in burning foods according to an embodiment of the present invention. FIG. 9 is a side sectional view of a conventional cooking device. 16 …… upper heater, 17 …… oven, 18 …… upper heater reflector, 19 …… food, 20 …… oven bottom plate, 21 …… lower heater, 22 …… lower heater reflector, 23 …… turn Table, 27 …… Center of rotation of turntable, 29 …… Black paint, 31 …… Reflective surface of loose angle, 32 …… Reflective surface of steep angle, 44 …… Turntable motor, 46 …… Center of upper heater line.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-64-3418 (JP, A) Actually open 63-32207 (JP, U) Actually open 58-190306 (JP, U) Actually open 52- 67471 (JP, U)

Claims (4)

(57) [Claims] 1. An oven for heating and cooking food, an upper heater, a lower heater provided outside the oven, a turntable on which food is placed, and a reflection plate surrounding the lower heater. A heating and cooking device in which a heater is provided behind the rotation center of the turntable, and the oven bottom plate facing the reflection plate is painted black. 2. The cooking apparatus according to claim 1, wherein a part of the black coating on the oven bottom plate near the lower heater is removed or the film thickness is reduced. 3. An oven for heating and cooking food, an upper heater, a lower heater provided outside the oven, a turntable on which food is placed, and a reflection plate surrounding the lower heater. The heater is provided behind the rotation center of the turntable, and one end of the reflector is near the turntable, and the inclination of the reflection surface toward the center of the turntable is larger than the reflection surface from the bottom to the end of the turntable. A cooking device with a reflector so that the corners are loosened. 4. A reflection plate for an upper heater that surrounds the upper heater, wherein the reflection plate has a parabolic cross section, and the center of the upper heater is displaced by a predetermined distance to expand the reflected heat ray above the focus of the parabola. The heating and cooking device according to claim 3, wherein the heating and cooking device is arranged.