KR20100026969A - Heating cooker - Google Patents

Abstract

PURPOSE: A cooker is provided to improve the heating efficiency since one side wall of the oven cavity is concaved with a curved surface. CONSTITUTION: A cooker comprises a hot air circulation unit with a heater(7) and a fan(6). The heater and the fan heat food received in an oven cavity. One or more of the side walls of the oven cavity have a concave curved portion(S) so that hot air produced by the hot air circulation unit can directly contact the side walls having the concave curved portion.

Description

Heated Cooker {HEATING COOKER}

The present invention relates to a heated cooker which enables food to be cooked by hot air oven heating.

BACKGROUND ART Conventionally, a heating cooker having a plurality of heating means has been provided to widen the repertoire of heating cooking of food. For example, as the heating means, a heating cooker equipped with a hot air circulation unit for heating foods in a hot air oven, a magnetron for heating foods in microwaves (high frequency), and a flat heater for grill cooking are widely used.

Among them, the hot air circulation unit is configured at, for example, the innermost side of the oven and includes a hot air heater and a hot air fan. The hot air blown into the oven from the hot air circulation unit is It is a heating means for repeating the circulation of the food placed on each plate after being heated in a hot air oven, being recovered to a hot air circulation unit, and hot-aired again and ejected into the oven. Therefore, in the heating means by hot air, it is useful to make the heat distribution uniform by making hot air circulation without unbalance in the inside of an inside of the furnace efficiently.

In addition, in the conventional heating cooker, each side of the substantially rectangular-shaped oven having the inside as a heating chamber is composed of a flat wall surface, but as a means for improving the heating efficiency, a convex cone is formed on the ceiling wall surface of the interior inwardly, It has been proposed that the hot air supplied into the truncation cone is directed toward the food on the dish plate so as to efficiently heat it (see, for example, Japanese Laid-Open Patent Publication No. 2001-41466).

On the other hand, there is one disclosed in Japanese Laid-Open Patent Publication No. 2008-14618 as a heating cooker which supplies steam to an oven to heat food (steam cooking or warming cooking by high temperature steam). In this heating cooker, the water droplets falling along the back plate of the oven are received by the cylindrical receiving member and stored in the storage member. Further, Japanese Laid-Open Patent Publication No. Hei 2-187526 describes a configuration in which a fan is driven for a certain time after steam generation, and water vapor in the oven is forced out of the exhaust port to prevent water vapor and condensation on the viewing window of the door.

However, in the above structure, the expected effect cannot be obtained for the improvement of the heating imbalance in the oven, and only the improvement of the limited heating efficiency for the food of one dish is achieved. For example, it is difficult to apply when arranging two steps of each plate up and down. In addition, the hot air hit by the cone is reflected by the collision angle, but the hot air itself is a linear flow, it is difficult to uniform the heating distribution by eliminating the heating imbalance in the furnace.

That is, basically, the hot air is blown in the centrifugal direction obliquely along the rotation direction of a hot air fan. The jetted hot air flows along the inner circumferential wall surface, i.e., a linear flow is mainly used. For this reason, a normal hot wind flow creates a basin that becomes a weakness, and it is difficult to obtain an appropriate mixing mode of hot air, and a hot air circulation without uniform imbalance in the air and a uniform heating distribution cannot be obtained.

In addition, in a heated cooker provided with steam supply means, the steam is attached to the oven and the wall surface to form water droplets. In particular, when water droplets are generated on the ceiling surface of the oven oven, the water droplets fall from the ceiling and adhere to the food. It may affect the finish. In this case, although the countermeasure is taken in the heating cooker of Unexamined-Japanese-Patent No. 2008-14618 about the collection | recovery of the water droplet of an oven and a back plate, it cannot prevent that the water droplet from a ceiling falls to food. Moreover, in the structure of Unexamined-Japanese-Patent No. 2-187526, although it is effective about the water vapor and condensation of a seeing window, this also cannot prevent the water droplet from a ceiling falling to food.

SUMMARY OF THE INVENTION An object of the present invention is to provide a heated cooker capable of uniformly distributing heat by circulating the inside of the hot air spouted in a balanced manner in order to solve the above problems.

In addition, the heating of which the one side wall of the oven which was adopted in order to improve the heating efficiency is made into a curved shape in which the inner surface is concave, and the flat heater disposed on the outer surface of this curved portion can be suppressed with good adhesion to the curved shape. To provide a cooker.

Another object of the present invention is to provide a heating cooker capable of preventing drops of water from adhering to the food during food heating (food cooking) by steam.

In order to achieve the above object, the heating cooker of the present invention includes an oven oven formed in a box shape by opening a front surface in a housing body, and a hot air circulation unit composed of a heater and a hot air fan for heating the food contained in the oven oven. In having

It is characterized in that the curved surface portion in which the inside is concave is formed in at least one main wall surface of the main wall surface of the oven in which hot air is blown out from the said hot air circulation unit.

In addition, in order to achieve the above object, the heating cooker of the present invention comprises a flat heater disposed on the outer surface of the curved portion, and is formed of a plate-shaped member that is curved, and includes a plurality of convex portions that are convex in the oven height direction. And a heater suppressing member for suppressing the flat heater to the curved outer surface.

In addition, in order to achieve the above object, the heating cooker of the present invention is characterized by having a steam supply means for supplying steam to the oven, and forming a curved shape in which the inner side is concave on the ceiling surface of the oven.

According to the present invention, the hot air blown into the air flows along the curved shape of the main wall surface, so that the flow in the twisting direction is generated. This can promote the uniformity of the heating distribution.

Thereby, the heating cooker which heats hot air oven heating with respect to food efficiently, and improves finishing can be provided.

In addition, according to the present invention, even if the heater suppressing member is not formed into a curved shape along the curved portion in advance, the flat heater can be pressed down with good fit according to the curved portion of the side wall of the oven, thereby reducing the manufacturing cost and improving the heating efficiency. We can plan.

Further, according to the present invention, it is possible to prevent the water droplets condensed on the ceiling surface of the oven during food heating by steam falling onto the food.

(Best form for carrying out the invention)

(1st embodiment)

Hereinafter, a description will be given with reference to FIGS. 1 to 3 showing a first embodiment of the present invention.

1 is a front view of a heating cooker in a state excluding the front door, FIG. 2 is a longitudinal cross-sectional view showing a cross sectional configuration of the central portion excluding the door, and FIG. Based on these drawings, the overall configuration of the heated cooker will be described.

In the inside of the housing body 1, which forms a rectangular box shape forming an outline, an oven oven 2 having a box shape with an open front face is provided, and a door 4 for opening and closing the front opening 3 is provided. It is installed so that rotation is possible. In addition, as the main wall which forms the oven 2, it consists of a ceiling wall 2a, the bottom wall 2b, the left wall 2c, the right wall 2d, and the inner wall 2e, and also this embodiment In the example, each circumferential wall except for the ceiling wall 2a has a general flat surface shape, whereas the ceiling wall 2a forms a curved surface portion S having a curved shape that is concave inwardly. This will be described later.

In the present embodiment, the hot air circulation unit 5 is provided inside the oven 2. This hot air circulation unit 5 is a structure provided with the hot air fan 6 arrange | positioned at the back side of the inner wall 2e, and the frame-shaped hot air heater 7 arrange | positioned at the outer periphery, especially as shown in FIG. . Then, the air drawn from the center is blown in the centrifugal direction by the rotational drive of the hot air fan 6, and the hot air heated by the hot air heater 7 is blown into the oven 2.

Therefore, the inner wall 2e mainly includes a plurality of through holes mainly formed at a position corresponding to the center of the hot air fan 6 and corresponding to the shape of the inlet 8a and the hot air heater 7. A jet port 8b is formed in a plurality of parts (see FIG. 1), and hot air circulation by the hot air jet and suction is enabled.

Moreover, the hot air heater 7, the hot air fan 6, etc. are covered with the cover member 9 which has a heat shield effect so that the hot air heater 7, the hot air fan 6, etc. may be enclosed from the outside, and hot air circulation can be performed appropriately.

Here, the concrete structure of the ceiling wall 2a which has the said curved-shaped part S is demonstrated. The hot air blown out from the hot air circulation unit 5 is discharged mainly from the jet port 8b toward the outer circumferential direction based on the air flow in the centrifugal direction (direction shown by thick arrow A in the drawing).

The hot air in the initial stage of the blowout which has such a tendency is guide | induced to the front of a storehouse by directly contacting the ceiling wall 2a which forms the inner wall of a storehouse, the side walls 2c and 2d of right and left, and the bottom wall 2b. Among them, in the present embodiment, the ceiling wall 2a is a curved surface portion S having a curved shape. For example, the shape of the ceiling wall 2a as viewed from the front shown in FIG. It forms as the curved-shaped part S which forms what is called a "quantity set" (Quonset).

Therefore, although detailed operation | movement description is mentioned later, for example, as shown in FIG. 2, the hot wind blown from the hot-air circulation unit 5 to the direction shown by the thick arrow A in the upper part of the ceiling on the ceiling wall 2a side is a ceiling wall. After contacting with (2a) another normal direction of a predetermined angle, it flows forward along the curved surface direction.

On the other hand, the food (not shown) heated by hot air as described above, ie, hot air oven heated, is placed and accommodated in the square plate 10. This square dish 10 forms the rectangular dish shape of the metal enamel, and it is possible to arrange | position it in the upper and lower two stages in the oven 2. That is, the shelf part 11 which protrudes inward to the upper and lower stages 2 is extended in the horizontal direction along the wall surface in the side walls 2c and 2d of the oven 2 in the left and right.

Peripheral edges of both side portions of the angle plate 10 are placed on the upper surface of the shelf portion 11, so that the angle plate 1 can be easily detached by sliding the angle plate 1 from the opening portion 3 with respect to the oven 2. Doing.

In addition, in the structure of the said ejection opening 8b, the ejection opening 8b of the ceiling side upper passage and the bottom wall side lower passage divided by the upper and lower two-step angle dishes 10 is both the center part between the upper and lower angle dishes 10, and It consists of a larger number of permeation hole groups than the jet port 8b, and therefore it is possible to jet a large amount of hot air.

Subsequently, the operation of the heating cooker having the above configuration will be described.

As shown in the drawing, the angle plates 10 are arranged in two stages up and down through the shelf 11, and foods not shown are placed and accommodated on the angle plates 10. Based on the driving operation, the hot air circulation unit 5 is energized and driven, hot air is generated by the hot air heater 7 and the hot air fan 6, and is blown into the oven 2 from the jet port 8b.

After the basic flow of the hot air blown out in the oven 2 is discharged toward the main wall surface in the furnace by centrifugal action as indicated by the thick arrows A in the upper and lower parts of the furnace in FIG. Although mentioned later, it flows inside the upper and lower passages shown in FIG. 2 as shown by the solid arrows B1 and B2, and moves forward.

Then, the rear surface of the door 4 is inverted and concentrated on the passage side of the central portion as indicated by the solid arrow C, and is sucked into the cover member 9 from the suction port 8a of the inner wall 2e. In the meantime, the food on each dish 10 is heated by hot-air oven, and also the temperature is lowered, hot air containing moisture is recovered, heated by hot-air circulation unit 5 and hot-aired again to be supplied into the oven 2 That is, hot air circulation continues to be performed, and heating cooking is accelerated.

3 shows the flow of hot air (indicated by the thick arrow A) blown toward the circumferential walls of the left and right sidewalls 2c and 2d in the central portion, and the hot air blown out in contact with the side wall surface of the flat surface shape. Then, it flows linearly along the said wall surface, and moves forward as shown by the solid line arrow B3, and it moves to the reverse direction so that the hot air shown by the solid line arrow C is attracted to the hot air fan 6 in the center part of one center. The basic hot air flow is shown.

In this case, the flow of the hot air will be described in more detail. Among the hot air blown out from each of the jet holes 8b in the direction of the thick arrow A, the side walls 2c and 2d of the left and right sides of the normal flat surface shape and the bottom wall ( All of the hot air in contact with 2b) flows mainly in a straight line along the flat wall and moves forward in the chamber.

In the passage side of the bottom part shown in FIG. 2, it flows in the direction of the solid line arrow B2, and in the center part shown in FIG. 3, it flows in the direction of the solid line arrow B3, and it circulates in the direction of the solid line arrow C as mentioned above.

On the other hand, as shown in Fig. 1, the cross-sectional shape of the circumferential wall constituting the curved shape S of the "quantity type" having a curved shape is circumferentially along the rotational direction R of the so-called hot air fan 6. It is formed with curvature.

Therefore, the hot air blown out toward the ceiling wall 2a (in the direction of the thick arrow A) is in contact with the ceiling wall 2a in a normal direction at a predetermined angle, and is mainly ejected upwardly inclined (see FIG. 2). After being in contact with the curved surface of the "quantity type" of the ceiling wall 2a, it becomes the flow which moves forward along the said curved-shaped part S, and is twisted by the flow of the hot air as shown by the solid arrow B1. Generate action.

Then, the hot air on the passage side of the upper part of the furnace weakens the straightness, promotes the torsional action, and finally forms a vortex. As a result, the stirring effect of the hot air is enhanced, and the gas is circulated to fill the inside of the air, which spreads to the whole inside of the air to effectively effect the uniformity of the heating distribution in the air.

As described above, according to the first embodiment, the following effects are obtained.

In the main wall surface of the oven 2 in which hot air is blown out from the hot air circulation unit 5, a curved shape is formed in which the inside is concave to the ceiling wall 2a, and the curved shape portion S of the "quantity type" is, for example, The hot air blown into the furnace by the formation is in contact with the inner surface of the ceiling wall 2a, and then flows along the curved portion S to generate a flow in the torsion direction, thereby suppressing the linear flow to prevent the flow of the vortex in the furnace. Can be generated.

As a result, it is possible to promote hot air circulation without unbalance in the furnace and to promote uniformity of the heating distribution, and to perform hot cooking with good hot air oven heating for foods with good finish.

In addition, the ceiling wall 2a is one of the main wall surfaces which the hot air blown out from the hot air circulation unit 5 directly contacts, and the cross-sectional shape of the wall surface forming the curved shape S is the rotation direction of the hot air fan 6. Formed with curvature in the circumferential direction along (R), the hot air flowing along the curved portion S can be smoothly and reliably guided in the twisting direction.

<Variation example>

Fig. 4 is a diagram corresponding to Fig. 1 showing a modification, and the same reference numerals are given to parts substantially the same as those of the first embodiment, and explanations thereof will be omitted.

In the first embodiment, the curved portion S of the ceiling wall 2a is formed in a "quantity" shape, whereas the curved portion of this embodiment has a curved shape of, for example, the ceiling wall 2f in a "dome shape". (W), and other configurations are common.

Compared to the "quantity type", since the periphery forms a curvature shape based on a circular shape, the hot air obtains a different type of twisting action depending on the position where the hot air is in contact, and the improvement of the stirring effect of the hot air can be expected. Thereby, the uniformity of heating distribution can be attained.

Moreover, as other curved shapes, various developments, such as a parabola-shaped curved surface (refer FIG. 10) which draws a parabola mentioned later, a suspension line (catenoid) shape, are possible. In addition, the curved shape is not limited to the ceiling wall, but can be provided on any one or the entire surface of the main wall.

However, in the case where the ceiling wall 2a or the bottom wall 2b is formed in a curved shape, the angle plate 1 on which the food is placed and the curved surface portion are arranged to face each other, and in the plane direction of the angle plate 10. It is especially effective for carrying out the heating cooking which can spread the hot air of and suppresses heating imbalance.

<Another modification>

FIG. 5 is a diagram corresponding to FIG. 3 showing another modified example, which improves the means for supporting and fixing the angle plate 10 to further improve the stirring effect of hot air.

That is, in the first embodiment, as shown in Fig. 3, the circumferential edge portion of the angle plate 10 is placed on the shelf portion 11 in close contact with and fixed to the shelf portion 11 and the angle plate ( The distribution of the hot air between 10 is made into the structure which is not implemented substantially.

On the other hand, the modified example shown in FIG. 5 divides the shelf part 12 in the longitudinal direction, and also forms the clearance 13 by forming both division shelf parts 12a and 12b in the spaced apart position. It is.

In addition, in this embodiment, the left and right side walls 2g and 2h of the oven 2 are formed in a curved shape in which they are bulged outward, and a portion having the largest concave inside thereof corresponds to the gap 13. have. Therefore, the gap 13 between the divided shelf portions 12a and 12b includes a recessed portion of each of the side walls 2g and 2h, so that a large gap is formed, and the desired size can be set.

And even in the state where the square plate 10 is mounted in the split shelf parts 12a and 12b of the both sides formed in the left and right side walls 2g and 2h, as shown in FIG. 5, the gap 13 is not concealed, In this case, the state which communicates up and down with respect to the angle plate 10 of the lower part shown in figure is maintained.

And since the blower outlet 8b of the lower part (bottom wall side) is formed by many perforation holes rather than a center part (refer FIG. 1), a part of hot air flows in from the downward direction upward (center part side) through the gap 13 ( The mixing and stirring are performed by the solid arrow B4), the flow of linear hot air (indicated by the solid arrow B3), and the like.

In addition, although not shown, the upper passage on the ceiling side is similarly introduced from the upper side through which a large amount of hot air flows through the gap 13 toward the lower side (center portion side), and the mixing and stirring of the hot air is promoted.

As a result, in the heating cooking according to the energization driving to the hot air circulation unit 5, a part of the hot air circulating is distributed in the vertical direction from the part, that is, the gap 13, in the middle of not reaching the door 4, and the hot air is mixed and stirred. The gap 13 functions as an air vent of hot air, and in particular, the gap plate 10 is arranged in two stages to suppress heating imbalance due to uniform heating even under conditions in which hot air circulation in the air is poor. I can perform a heating cooking well.

As a result, a part of the hot air circulates through the gap 13 from the side of the inside of the refrigerator, mainly with the basic hot air flow (indicated by the respective arrows A, B, and C in FIG. 2), and a better stirring effect can be expected. In addition, since the hot air of the upper passage flows to fill the passage (the interior) under the twisting action of the curved portion S as described above in FIG. 1 and the like, the circulation of the hot wind from the gap 13 is further promoted. .

In addition, as soon as the hot air circulating unit 5 is ejected from the hot air circulating unit 5, a portion of the hot air having a sufficient amount of heat flows through the gap 13 and can be circulated while mixing and stirring. The cooking by the balance can be improved well.

In addition, in order to increase the amount of ventilation by the gap 13, the left and right side walls 2g, 2h have a curved shape inwardly, but this may be provided depending on the amount of ventilation, the shape of the shelf 12, and the like. Other suitable shapes can be considered. For example, the curved shape as a whole in the present embodiment is advantageous in that the flow of hot air flowing along the sidewall is smooth. However, the sidewall may be a "quantity-shaped" curved shape. It is possible to implement.

(2nd embodiment)

6 to 10 show the second embodiment of the present invention. Parts substantially the same as those of the first embodiment are denoted by the same reference numerals, and descriptions thereof will be omitted.

FIG. 6 shows a longitudinal frontal configuration of the flat heater and the heater suppressing member, FIG. 7 shows a front side view of the heating cooker without a door, and FIG. 8 shows a longitudinal sideal configuration of the heating cooker 1 have. FIG. 9 shows a second embodiment of a heating cooker having a flat heater effective for grill cooking, and FIG. 10 is a perspective view of the flat heater suppressing member.

Ring portions 21a and 21b are formed at the upper left and right side portions 2c and 2d of the oven 2, and ring portions 22a and 22b are formed at the left and right ends of the ceiling wall 2a. The oven 2 is comprised by joining these ring parts 21a, 21b, 22a, 22b with the screw 23 and the nut 24. As shown in FIG.

For example, the ceiling wall 2a of the said oven 2 is formed in the curved shape in which the inside is concave, and attaches the code | symbol S to the said curved-shaped part. In this case, the curved portion S is curved from the center of the ceiling wall 2a to the left and right side walls 2c and 2d.

Screw insertion through-holes not shown are formed in two places in the inner longitudinal direction at the central portion, both ends, the middle portion and the middle portion between the curved portions S.

In the inner wall 2e of the oven 2, a hot air jetting opening 8b and a hot air suctioning opening 8a each formed of a plurality of small holes are formed. The hot air circulation unit 5 is provided in the rear part of the said inner wall 2e.

This hot air circulation unit 5 is comprised with the hot air fan 6 and the hot air heater 7. As shown in FIG. The hot air circulation unit 5 sucks air in the oven 2 from the hot air intake 8a by the centrifugal blowing action of the hot air fan 6 and blows it into the oven 2 from the hot air blower 8b. At this time, the hot air is heated by the hot air heater 7. This hot air circulation unit 5 is suitable for oven cooking.

The flat surface heater 14 is laid on the outer surface of the curved portion S in a suppressed state by the heater suppressing member 25. As shown in FIG. 9, the planar heater 14 is one piece, and forms the magnitude | size which covers almost the whole outer surface of the said curved-shaped part S. As shown in FIG. The screw insertion passage hole 26 is formed in the center part, both ends of this planar heater 14, the middle part of the said center part, and both ends, and in two places of an inner longitudinal direction.

As shown in Figs. 6 and 10, the heater suppressing member 25 is composed of a metal plate-shaped member which can be bent, and the convex portion 27 which is convex in the direction of the oven 2 is the central portion, It is formed in four places in both ends, these center part, and the intermediate part between both ends. This convex part 27 is formed in the form extended in the internal longitudinal direction. And the screw insertion hole 28 is formed in the immediately front side and inside of the said convex part 27. As shown in FIG.

The mounting structure of the said flat heater 14 is demonstrated. The flat heater 14 is disposed on the outer surface of the curved portion S as shown in FIG. 9, and the heater suppressing member 25 is disposed on the outer surface of the flat heater 14 so that the convex portion 27 is oriented in the internal longitudinal direction. It arrange | positions, the heater suppressing member 25 is bent, and the convex part 27 makes the flat heater 14 contact the curved-shaped part S outer surface. In this case, since the convex part 27 extends in the inner longitudinal direction which is a direction different from a curved direction, curvature deformation is not inhibited.

Thereafter, the screw insertion hole of the curved portion S, the screw insertion hole 26 of the flat heater 14, and the screw insertion hole 28 of the heater suppressing member 25 are removed from the oven 2. The screw 29 which passed through is tightened with the nut 30, and the flat heater 14 is suppressed and mounted on the outer surface of the curved-shaped part S by the convex part 27 of the heater suppression member 25 by this. As a result, the flat heater 14 comes into close contact with the outer surface of the curved portion S. As shown in FIG.

In the above-described configuration, when the grill heater in which the flat heater 14 is energized, the flat heater 14 is pressed against the outer surface of the curved shape S by the heater suppressing member 25, so that the heat of the flat heater 14 is reduced. It is well fed into this oven 2. In this case, since the space portion 32 of the concave portion 31, which is relatively concave with respect to the convex portion 27 of the heater suppressing member 25, has a heat insulating effect, heat of the flat heater 12 is raised (2). ) In the direction of And since the curved-shaped part S exists in the oven 2, internal air becomes good convection and the so-called stone type heating form is obtained.

In addition, when the food in the oven 2 is heated by the hot air circulation action of the hot air circulation unit 5, a hot air circulation form different from that of the rectangular inner box is obtained, and the heating efficiency is good.

According to the present embodiment as described above, since the curved portion S is formed on the circumferential wall of the oven 2, for example, the ceiling wall 2a, the inside of the oven 2 is heated. (2) It can be set as the convection heating form, what is called a stone kiln heating form.

Moreover, the convex part 27 which consists of the plate-shaped member which can be bent the heater suppression member 25 for suppressing the planar heater 14 to the curved surface part S outer surface is convex toward the oven height 2 direction. It is provided with a plurality, the convex portion 27 is configured to suppress the flat heater 14 to the curved surface portion (S) outer surface, so the convex portion 27 of the heater suppressing member 25 is curved The flat heater 14 can be suppressed in accordance with the curved surface of the shaped portion S, and the flat heater 14 can be brought into close contact with the outer surface of the curved shaped portion S by the convex portion 27.

As a result, even if the heater suppressing member 25 is not formed into a curved shape along the curved shape S in advance, the flat heater 14 can be suppressed with good adhesion in accordance with the curved shape S of the oven 2. This can reduce the production cost and improve the heating efficiency. In addition, the space portion 32 of the concave portion 31, which is concave relative to the convex portion 27, acts as a heat insulating material, and heat transfer to the oven oven 2 can be prevented, which also increases heating efficiency. Improves.

In this case, according to this embodiment, since the convex part 27 of the heater suppressing member 25 is formed in the form extending in the inner longitudinal direction which is a direction different from the curved direction of the curved-shaped part S, the heater suppressing member The convex part 27 can be formed in the form extended long, without inhibiting the curvature of 25, and the flat heater 14 can be suppressed in a long range.

In addition, according to the present embodiment, the flat heater 14 includes a screw insertion hole 26, and the heater suppressing member 25 is formed by the screw 29 passing through the screw insertion hole 26. Since it is fixed to the curved-shaped part S, the movement of the flat heater 14 can be prevented by the screw 29 which fixes the heater suppressing member 25. FIG.

(Third embodiment)

11 to 14 show the third embodiment of the present invention. The same reference numerals are given to parts substantially the same as the first embodiment, and explanations thereof will be omitted.

11 and 12 show a third embodiment of a heating cooker having a flat heater 14 effective for grill cooking, of which FIG. 11 is a longitudinal front view showing a schematic configuration of the heating cooker, and FIG. 12 is an oven. It is an external appearance perspective view of the height 2 from the upper side.

The flat heater 14 is generally provided in close contact with the outer wall surface side of the ceiling wall 2a. For this reason, in order to make a flat shape, the coil for heaters is wound around the flat mican (micanite), for example, and it is set as the structure put into the mica plate from both surfaces.

In addition, in this embodiment, it is the heating cooker which formed the ceiling wall 2a as what is called a "quantity-shaped" curved shape S in which the inside is concave like the structure demonstrated in 1st Example, and a plurality of plane heater 14 was provided. It is divided into.

That is, when the planar heater 14 is configured as a single plate, the curvature must be mounted according to different curvature so as to increase the curvature by both ends or to follow the curved shape S of the ceiling wall 2a. It is possible that different bends occur in plural places of one flat heater 14, and stress is concentrated therein.

Therefore, not only the mounting work in close contact with the ceiling wall 2a needs to be carried out carefully, but also the effect on the lifespan such as damage to the heater coil and the mica plate is concerned.

Therefore, in the present embodiment, the planar heater 14 is divided into a plurality of portions along the curved direction of the curved portion S, for example, divided into three in the present embodiment and positioned at the top of the curved portion S. The central heater 14a and the peripheral heaters 14b and 14c on both sides which are the peripheral portions are mounted respectively. In this case, when the "quantity-shaped" curved-shaped part S is symmetrical, normally, the peripheral heaters 14b and 14c become substantially the same form.

The central heater 14a may correspond to a gentle curved surface (small curvature) centered on the top of the curved portion S, and the peripheral heaters 14b and 14c have left and right to increase curvature compared to the central portion. What is necessary is just to set it as the structure corresponding to the curved surface of both sides. In this case, the length F of the central heater 14a constituting a gentle curved surface is made longer than the lengths G1 and G2 of the peripheral heaters 14b and 14c (F &gt; G1 = G2), respectively, to have different curvatures. Is attached to the ceiling wall 2a.

On the other hand, the output of the central heater 14a is set smaller than the peripheral heaters 14b and 14c. This output setting can be easily set by changing the output density. For example, the output density can be easily set regardless of the length or length of the heater length by changing the winding density of the heater coil.

In this way, the flat heater 14 is divided into a plurality of divided configurations, so that problems caused by large curvatures and other curvatures can be eliminated as in the single plate configuration, and the heaters 14a, 14b, and 14c divided into three are each located in one place. It can be attached to the ceiling wall 2a in the state which can be solved only by respond | corresponding to the bending or simple bending shape, and each curvature can also be made small.

Therefore, since the stress applied to the bent portion can be reduced, an improvement effect on cracking and the like can be expected. Moreover, it is effective in the point that it is excellent in adhesiveness, a heating efficiency can be improved, mounting is also easy, and it can respond easily also to the structure of the oven 2 provided with the curved-shaped part S.

On the other hand, since the output of the center heater 14a is set smaller than that of the surrounding heaters 14b and 14c, the heating concentration can be eliminated in the center portion that is generally concave inward, and the heating imbalance for food is eliminated. It is effective for uniform heating of the whole.

The heater suppressing member 33 shown in FIG. 13 is provided with the convex part 34 corresponding to the curved direction of each heater 14a, 14b, 14c, and each heater 14a, 14b is provided in the convex part 34. As shown in FIG. , A screw insertion through hole 35 is formed corresponding to a screw insertion through hole (not shown) provided in 14c. However, flange portions 36 are formed at both ends of the heater suppressing member 33, and the screw insertion passage holes 37 for passing the screws 23 for joining the oven are formed in the flange portions 36. Is formed.

Moreover, the heat insulating material 39 is arrange | positioned in the recessed part 38 of the heater suppressing member 33, and in this case, each heat insulating material 39 of the height size H (refer FIG. 13) of each recessed part 38 is carried out. The thickness in the free state is large.

When the flat heater 14 is installed on the outer surface of the curved shape S, the flat heater 14 is arranged in the curved direction on the outer surface of the curved shape S as illustrated in FIG. 12.

And the heat insulating material 39 is arrange | positioned on each heater 14a, 14b, 14c of the planar heater 14, as shown in FIG. 14 (or the heat insulating material in each recessed part 38 of the heater suppression member 33). (39) is accommodated), the screw insertion through hole (not shown) of the curved surface portion (S), the screw insertion through hole (not shown) of the flat heater 14, the respective screw insertion of the heater suppressing member (33) The screws 40 and 41 which have passed through the through holes 35 and 37 are fixed with nuts 42 and 43, respectively.

Thereby, each heater 14a, 14b, 14c of a planar heater is installed in the state which was suppressed by the heater suppression member 23 on the outer surface of the curved-shaped part 6 through the heat insulating material 39. As shown in FIG.

According to this third embodiment, the heat insulating material 39 is accommodated and disposed in the concave portion 38 which is concave relative to the convex portion 34 of the heater suppressing member 33, and the convex portion 34 and the heat insulating material ( Since the flat heater 14 is suppressed by 39), heat transfer to other than a heating chamber can be prevented, and heating efficiency can be improved by this.

Further, according to the third embodiment, since the planar heater 14 is divided into a plurality of in the curved direction, and the end portions in the curved direction of the heaters 14a, 14b, 14c of these flat heaters are suppressed by the heat insulating material 39. Flotation of the edge part of the flat heater 14 can be prevented using the heat insulating material 39.

In this case, according to the third embodiment, the heat insulating material 39 is made larger because the thickness of the heat insulating material 39 in the free state is increased with respect to the height size H of the recess 38 of the heater suppressing member 33. It is compressed between the heater suppressing member 33 and the flat heater 14, and as a result, each heater (14a, 14b, 14c) can be more closely adhered to the outer surface of the curved shape (S), the flat heater 14 Injury in the center can be further prevented.

Further, according to the third embodiment, the heater suppressing member 33 is provided with a convex portion 34 in the middle portion of the curved direction of each heater 14a, 14b, 14c of the flat heater, and the heater suppressing member 33 is Since the convex portion 34 is fixed to the curved surface portion S by the screw 40 passing through the screw insertion hole 35, the convex portion 34 is provided to fix the error of the flat heater 14 and prevent the injury of the central portion. ) Can be prevented.

In addition, it is also possible to employ | adopt a secondary curved surface, such as spherical shape and a parabola shape, in place of said "quantity set" as a curved shape part. In this case, since the curvature becomes large at the center part (top part) of a secondary curved surface, the close mounting structure of the flat heater to the curved-shaped part S becomes more difficult.

In this case, the plane heater is divided into a plurality of plane heaters along the curved direction as described above, the length of the central heater is shortened, the length of the heater in the periphery is increased, and the planar heater is divided into a length corresponding to each curvature. Can be installed without difficulty.

(4th Embodiment)

Fig. 15 shows a fourth embodiment of the present invention, in which the following points are different from the third embodiment. That is, the curved end portion S of the oven 2 has the right end of the peripheral heater 14b, the both ends of the central heater 14a of the flat heater 14, and the left end of the peripheral heater 14c. To form a concave portion 42 in which the outer surface of the curved portion S is concave (convex in the inner direction of the oven oven 2), and the right end portion and the central portion heater ( Both ends of 14a) and the left end of the circumferential heater 14c are suppressed by the heat insulating material 39 to the outer surface of the concave portion 42.

According to the fourth embodiment, the flat heater 14 can be further brought into close contact with each other so as not to rise to the outer surface of the curved portion S, and the right end of the peripheral heater 14b and both ends of the central heater 14a, Injury of the left end of the peripheral heater 14c can be further prevented.

(5th Embodiment)

Fig. 16 shows a fifth embodiment of the present invention, in which the following points are different from the third embodiment. That is, the right end of the circumferential heater 14b of the recess 38 of the heater suppressing member 33, both ends of the central heater 14a, and corresponding portions of the left end of the circumferential heater 14c. Since the convex part 43 which becomes convex in the (2) direction was formed, the heat insulating material 39 with respect to the right end part of the said peripheral part heater 14b, the both ends of the center part heater 14a, and the left end part of the peripheral part heater 14c. ), The pressing force can be strengthened, and the injury of each end can be further prevented.

In each of the above embodiments, the lengths of the central heater 14a disposed at the center portion of the flat heater 14 and the peripheral heaters 14b, 14c disposed on both sides of the central heater 14a are different. You may arrange | position substantially equally each heater formed in the substantially same length on the outer surface of curved-shaped part S. As shown in FIG.

(6th Embodiment)

17 and 18 show a sixth embodiment of the present invention, in which FIG. 17 is equivalent to FIG. 11 and FIG. 18 is substantially equivalent to FIG. 1 for explaining the operation.

In this embodiment, as shown in Fig. 17, the microwaves from the magnetron 15 can be irradiated into the refrigerator from below the oven 2, and the irradiation direction of the microwaves from the magnetron 15 is determined by the ceiling wall ( It faces toward the curved-shaped part S of 2a), and the other oven circulation unit etc. are common structure with 1st Example.

Specifically, the magnetron 15 as a heating means is provided outside and communicates with the opening to the bottom wall 2b of the oven 2 through the waveguide 16. On the upper surface side of the bottom wall 2b, a predetermined space is formed so that the bottom plate 17 made of another member is placed and fixed.

The bottom plate 17 is formed in a flat shape with a material that transmits microwaves, for example, heat resistant glass, and a reflector 18 for reflecting and stirring microwaves in the space between the bottom plate 17 and the bottom wall 2b. ) Is rotatably installed, and is configured to rotate by the motor 19.

In the case of performing microwave heating cooking, a special angle plate made of glass or the like that transmits microwaves is usually placed through an appropriate shelf (not shown), and food is placed on each plate to start operation. do. The magnetron 15 is driven, and the generated microwaves are irradiated and supplied into the oven 2 via the waveguide 16.

In this case, the microwaves are reflected and agitated by the rotation of the reflector 18, and are widely and evenly supplied into the refrigerator through the bottom plate 17. The microwaves are effectively irradiated to food to perform heating cooking.

By the way, in this embodiment, the ceiling wall 2a is set as the "quantity-shaped" curved-shaped part S which has in common with 1st Embodiment. For this reason, as shown in FIG. 18, it is especially easy to reflect the microwave which reaches the wall surface of the ceiling wall 2a in a left-right direction, and to direct it inward (refer the radio wave trace D mentioned later).

Therefore, in FIG. 18, the curvature of the curved-shaped part S was calculated | required so that the microwaves reflected in the substantially center part of the bottom plate 17 may be calculated | required. The propagation trajectory (D) of is shown.

In this way, the entire microwave can be concentrated in the central region Y indicated by the dashed-dotted line on the bottom plate 17, so that the heating action of the center portion can be strengthened, and the heating action of the food normally arranged in the center can be effectively performed. have.

In addition, the curved shape S of the ceiling wall 2a can use the structure which makes it useful for the uniformization of hot air oven heating by the hot air circulation unit 5 as mentioned above in 1st Embodiment, The heating cooker equipped with the heating means by the magnetron 15 can further improve its convenience.

<Variation example>

FIG. 19 is a view corresponding to FIG. 18 showing a modification to the sixth embodiment, and the curved surface portion Z having a curved surface formed of secondary curved surfaces forming, for example, a parabolic shape on the ceiling wall 2i, for example, by drawing a parabola. ) And the others are common to the sixth embodiment.

And, as can be understood from the microwave propagation trajectory E shown in the figure, it is excellent in that a microwave can be concentrated more in the center region Y of the bottom plate 17 at approximately the entire circumference of the front and rear, right and left, Furthermore, the concentrated heating to the center portion can be made stronger.

The curved portion Z is not limited to this embodiment, but can be converted to, for example, a "dome shape" shown in FIG. In addition, the curved surface portion Z is not limited to the ceiling wall 2i as in the above-described embodiment, and may be provided, for example, on the left side wall 2c. In this case, the opposite right side wall 2d is provided. It is sufficient to provide a microwave irradiation port on the) side, and the concentrated region of the microwave can also be set at an appropriate position in the refrigerator.

(7th Embodiment)

Subsequently, a seventh embodiment of the present invention will be described with reference to FIGS. 20 to 23. In FIG. 20, the whole structure of the heating cooker 1 which removed the door is shown, and the food arrangement state is shown by the perspective state from the front, and FIG. 21 similarly shows the whole structure of the heating cooker 1 which omitted the door from the front. 22 shows the terminal side structure of the heating cooker 1, and FIG. 23 shows the steam generator part.

In addition, the same code | symbol is attached | subjected to the substantially same part as the said 1st Example, description is abbreviate | omitted, and a different point is demonstrated.

The bottom wall 2b of the oven 2 is located at the lower end of the left and right side walls 2c and 2d, and a groove portion 2m is provided.

As shown in FIG. 22, the steam supply apparatus 46 which is a steam supply means is provided in the outer side of the oven 2. The steam supply device 46 includes a water tank 47, a water supply pump 48, and a steam generator 49. The water tank 47 and the water supply pump 48 are arranged outside the oven 2, for example below the bottom wall 2b, and the steam generator 49 is an external example of the oven 2. For example, it is provided outside the left wall 2c.

As shown in FIG. 23, the steam generator 49 is comprised by embedding the steam heater 49b in the container main body 49a which consists of an aluminum die-cast, for example, and the steam discharge port 49c in the container main body 49a. ) Is formed. Three vapor discharge ports 49c are formed (only one is shown) in the internal longitudinal direction, and steam supply ports are provided at three locations on the left wall 2c of the oven 2 corresponding to each vapor discharge port 49c. 50 (only one is shown) is formed.

The vapor discharge port 49c is formed of a small hole, and the vapor is strongly ejected.

The steam supply port 50 facing each of the steam discharge ports 49c is larger in diameter than the steam discharge port 49c and is covered by a cover member 44 provided on the inner surface of the left wall 2c. The cover member 44 is formed with a cylindrical opening 44a continuous to each steam supply port 50. The cover member 44 protrudes from the left wall 2c of the oven 2 at each of the steam supply ports 50. The upper surface of the cover member 44 is inclined downward and prevents water droplets from remaining on the upper surface portion.

In addition, shelf parts 11 are provided on the left and right side walls 2c and 2d of the oven 2, and the shelf part 11 can flow downwards the water droplets flowing to the left and right side walls 2c and 2d. The upper surface is inclined to form a downward slope. The shelf part 11 may be formed by raising the side walls 2c and 2d.

The steam supply device 46 operates as follows to produce steam and to supply hot steam into the oven 2. That is, the vessel body 49a of the steam generator 46 is heated by the steam heater 49b, and the water supply pump 48 is driven to draw water from the water tank 47 into the vessel body 49a. Supply a fixed amount.

In this way, water vaporizes in the container main body 49a of high temperature, it is ejected from the steam discharge port 49c, and is supplied to the oven 2 through the steam supply port 50 and the opening 44a. In addition, although the steam spouted from this steam discharge port 49c has a high jet velocity around the steam supply port 50, the discharge velocity is moderated in the exit part of the opening 44a, and it discharges strongly in the oven 2 It doesn't work.

This steam supply device 46 is used for steam cooking. At the time of this steaming cooking, as shown in FIG. 20, the angle plate 10 is arrange | positioned at the shelf part 11, for example, the mesh shelf 45 is arrange | positioned at this angle plate 10, This mesh shelf We put food (F) of steaming cooking object on (45). In this state, the steam supply device 464 is operated to supply steam into the oven 2. During steaming, steam may condense on the inner surface of the oven 2 to generate water droplets.

In particular, steam rises and condenses on the ceiling plate 2a in many cases. Here, the inner surface (ceiling surface) of the ceiling plate 2a is concave inward, and the curved surface portion S having a shape that curves from the center to both sidewalls is formed. Ride to both side walls 2c and 2d.

Therefore, the drop adhesion of the water droplet to the food F can be prevented reliably.

The water droplets flowing through the left and right side walls 2c and 2d may be applied to the steam supply port 50, but the dropping of the water droplets to the steam supply port 50 portion is prevented by the cover member 44. . Further, water droplets flowing through the left and right side walls 2c and 2d are stored in the groove portion 2m provided in the bottom wall 2b.

According to this seventh embodiment, since the curved surface portion S is formed on the ceiling surface of the oven 2 so that the inner side is concave, water droplets generated on the inner surface of the curved surface portion S surround the inner surface of the curved surface portion S. It is transmitted to the side, and it does not adhere to the food in the oven 2, and a cooking finish does not worsen.

In particular, according to the present embodiment, the curved portion S is formed to be curved from the center of the ceiling surface to both side walls 2c and 2d, so that water droplets generated on the ceiling surface are left and right sidewalls 2c from the curved surface portion S. , 2d), and more reliably prevents water droplets from adhering to the food product (F).

In addition, since the steam supply device 46 is installed outside the oven 2, the wall surface movement of the water droplets is not impeded by the steam supply device 46, and the water drops do not fall from the steam supply device 46 portion. .

In addition, in the present embodiment, the cover 44 for installing the steam supply device 46 outside the side wall 2c of the oven 2 and covering the steam supply port 50 for supplying steam into the oven 2 is provided. Is installed on the inner surface of the side wall 2c of the oven 2. According to such a structure, since the steam supply apparatus 46 is not in the oven 2, the inside of the oven 2 can be utilized widely.

In this configuration, steam is supplied from the steam supply port 50 into the oven 2, but water droplets flowing through the steam supply port 50 portion or the inner surface of the side wall 2c of the oven 2 are discharged. When it is added to 49c, the strength of the steam blowing is strong, so that the steam is returned to the oven 2 together with the steam.

However, according to this embodiment, since the cover 44 covering the steam supply port 50 is provided, even if water droplets do not flow through the steam supply port 50 and water droplets are applied to the outlet portion of the opening 44a, Since the discharge rate of the steam is relaxed, the water droplets are not scattered into the oven 2 and the above problem can be prevented.

In addition, according to the present embodiment, since the grooves 2m are formed at the bottoms of the side walls 2c and 2d on the left and right bottom walls 2b of the oven 2, the water droplets flowing through the side walls of the oven 2 are formed in the grooves ( 2m) and can be easily removed.

This invention is not limited to each Example shown above and shown in the figure, For example, you may implement combining each Example suitably. In addition, specifically, as the curved portion, the curved surface is formed into a plurality of polygons (surfaces), for example, in the form of a "quantity-shaped" curved surface as a whole, to reduce residual stress to suppress the occurrence of deformation during heating or to have a curved shape. It is also possible to form a groove along the torsional direction of the hot air in contact with the hot air and to strengthen the flow in the torsional direction. In addition, the curved shape can be implemented by various modifications within the scope not departing from the gist of the present invention in the implementation such as employing a part of a secondary curved surface or a suspended curved surface.

1 is a front view of a state excluding a door of a heating cooker showing a first embodiment of the present invention,

Figure 2 is a longitudinal side view showing a cross-sectional configuration excluding the door,

3 is a cross-sectional plan view of FIG.

4 is a diagram corresponding to FIG.

5 corresponds to FIG. 3 showing another modified example;

6 is a longitudinal front view of the planar heater and the heater suppressing member according to the second embodiment of the present invention;

7 is a schematic longitudinal front view of the entire cooker;

8 is a schematic longitudinal side view;

9 is a perspective view of an oven in a state where a flat heater is disposed;

10 is a perspective view of a heater suppressing member;

11 is a vertical front view showing the third embodiment of the present invention;

12 is an external perspective view of an oven;

FIG. 13 corresponds to FIG. 10;

14 corresponds to FIG. 6,

15 is a view corresponding to FIG. 1 showing a fourth embodiment of the present invention;

Figure 16 corresponds to Figure 1 showing a fifth embodiment of the present invention,

17 corresponds to FIG. 6 showing a sixth embodiment of the present invention;

18 is a diagram corresponding to FIG. 1 for explaining the operation;

19 corresponds to FIG. 18 showing a modification;

20 is a perspective view from the front of the entire heating cooker according to the seventh embodiment of the present invention;

21 is a longitudinal side view of the heating cooker,

22 is a front view of the heating cooker without a door, and

23 is a longitudinal side view of a steam generator and cover member portion;

* Explanation of symbols for the main parts of the drawings

1: housing body 2: oven oven

2a, 2f, 2i: ceiling wall 2b: floor wall

2c, 2g: left wall 2d, 2h: right wall

4 door 5 hot air circulation unit

6: hot air fan 7: hot air heater

8a: inlet port 8b: outlet port

10: angle plate 11, 12: shelf

13: gap (ventilation part) 14: flat heater

14a: central heater 14b, 14c: peripheral heater

15: magnetron 17: bottom plate

18: reflector 25: heater suppressing member

27 convex part 31 concave part

32: space part 33: heater suppressing member

34: convex part 39: heat insulating material

42: concave portion 44: cover member

44a: opening 46: steam supply device

47: water tank 48: water supply pump

49 steam generator 49a container body

49b: steam heater 49c: steam discharge port

50: steam inlet

Claims (20)

Oven formed into a box shape by opening the front surface in the housing body, In the one having a hot air circulation unit consisting of a heater and a hot air fan for heating the food contained in the oven oven hot air oven, A heated cooker, wherein a curved shape portion in which an inner side is concave is formed on at least one main wall surface of an oven oven from which hot air is blown out from the hot air circulation unit. The method of claim 1, And a main wall surface on which the curved surface portion is formed is a main wall surface to which hot air blown out from the hot air circulation unit is in direct contact. The method according to claim 1 or 2, The cross-sectional shape of the circumferential wall surface which formed the said curved surface part was formed with curvature with respect to the circumferential direction along the rotation direction of a hot air fan, The heating cooker characterized by the above-mentioned. The method according to claim 1 or 2, A food mounting angle plate is mounted on the shelf portion protruding from the main wall surface of the oven, and a ventilation portion capable of circulating hot air in the vertical direction is formed between the shelf portion and the peripheral edge portion of the angle plate. Heated cooker. The method according to claim 1 or 2, Placing a flat heater on the outer surface of the curved portion, Comprising a plate-shaped member that can be bent, provided with a plurality of convex portions that are convex in the oven height direction, characterized in that provided by the convex portion a heater suppressing member for pressing the flat heater to the outer surface of the curved shape portion Heated cooker. The method of claim 5, wherein And a convex portion of the heater suppressing member is formed to extend in a direction different from a curved direction of the curved portion. The method of claim 5, wherein And a heat insulating material housed in a concave portion that is concave relative to the convex portion of the heater suppressing member, and the flat heater is suppressed by the convex portion and the heat insulating material. The method of claim 5, wherein The flat heater has a screw insertion passage, and the heater suppressing member is fixed to the curved portion by a screw passing through the screw insertion passage. The method of claim 5, wherein And the flat heater has a screw insertion hole in at least a center portion in a curved direction, and the heater suppressing member is fixed to the curved portion by a screw passing through the screw insertion hole. The method of claim 5, wherein The heater suppressing member includes the convex portion at least in the center of the curved direction of the flat heater, and is fixed to the curved portion by a screw passing through the screw insertion hole in the convex portion. Cooker. The method of claim 5, wherein And a thickness in the free state of the heat insulator with respect to the height of the concave portion of the heater suppressing member. The method according to claim 1 or 2, The outer surface of the main wall surface which formed the said curved part was provided with the plane heater comprised divided into the some along the curved direction, The heating cooker characterized by the above-mentioned. The method of claim 12, And a heater output of the heater disposed in the center portion of the planar heater configured by dividing is smaller than the heater disposed in the periphery of the curved portion. The method of claim 12, When making the said curved-shaped part a secondary curved surface, the length of the heater arrange | positioned at the center part side is short compared with the heater arrange | positioned at the circumference | surroundings in the length of the said divided flat heater, The heating cooker characterized by the above-mentioned. The method according to claim 1 or 2, And a magnetron for microwave-heating the food contained in said oven, wherein said microwave irradiation chamber is disposed so as to face the main wall surface having said curved portion. The method according to claim 1 or 2, And steam supply means for supplying steam into the oven, The curved shape part was formed in the ceiling surface of the said oven, The heating cooker characterized by the above-mentioned. The method of claim 16, The curved surface portion is a heating cooker, characterized in that the curved shape from the center of the ceiling surface to both side walls of the oven. The method of claim 16, The said steam supply means is provided in the outer side of the said oven, The heating cooker characterized by the above-mentioned. The method of claim 16, And the steam supply means is installed outside the side wall of the oven and a cover is formed on the inner surface of the side wall of the oven to cover a steam supply port for supplying steam into the oven. The method of claim 16, And a groove formed on the bottom wall of the oven and positioned at a lower end of the side wall.

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