JP6898140B2 - Cooker - Google Patents

Description

The present invention relates to a cooker that heats food using hot air generated by a heater and a fan.

Conventionally, in a microwave oven, which is a typical heating cooker of this type, food is cooked by heating the heating chamber to a high temperature with a heater. In addition, some microwave ovens employ a structure in which the air in the heating chamber is agitated using a fan in order to enable two-stage oven cooking. Specifically, a hot air circulation unit including a fan and a heater is arranged on the inner surface or the outer side of the heating chamber, and the air sucked from the heating chamber to the hot air circulation unit is heated by the heater to heat the hot air that has become hot. A hot air circulation method that supplies indoors is common.

When cooking in the upper and lower ovens, two square plates are installed in the heating chamber, and air is sucked into the hot air circulation unit from the central space sandwiched between the square plates to create the space outside the square plates. That is, hot air is supplied in two directions, the upper part of the upper square plate and the lower part of the lower square plate. Such a hot air circulation unit has a structure in which air is mainly sucked from a substantially central portion of a fan, the sucked air is heated, and then hot air is blown out from above and below.

In the hot air circulation unit, a centrifugal fan that sucks air from the central portion of the fan and discharges air in the centrifugal direction of the fan is installed near the center of the hot air circulation unit, and heaters are arranged around the fan. A hot air outlet is provided on the wall surface between the hot air circulation unit and the heating chamber, and the structure is such that hot air is supplied from the hot air circulation unit to the heating chamber. In this case, the hot air flows from the centrifugal fan in the centrifugal direction of the fan, that is, in the radial direction of the fan. Therefore, the hot air supplied from the hot air outlet to the heating chamber mainly takes a flow path toward the upper and lower wall surfaces of the heating chamber.

Generally, when air is heated by a heater, the heater is arranged on the air passage blown out from the fan in order to exchange heat efficiently. If the heater is installed near the heating chamber, radiant heat heats not only the air but also the wall surface of the heating chamber near the heater, and the wall temperature becomes high, which causes uneven heating. Therefore, the heater is separated from the wall surface of the heating chamber to some extent. It is placed in the position. On the other hand, if the wind speed around the heater is increased, heat exchange in the heater is promoted and the air can be heated efficiently. However, if the wind speed is simply increased, the hot air is supplied to the heating chamber. Was sometimes discharged toward the upper and lower wall surfaces of the heating chamber.

Patent Document 1 is a background technique in this technical field. In this publication, "the suction port is provided at positions substantially equally spaced from the two side walls, and the air outlet is intermediate between the peripheral edge portion of the partition wall where the partition wall and the side wall are in contact with the suction port. It is described as "a heating device provided in the vicinity, in which the housing is in contact with the partition wall in the vicinity of the air outlet".

Further, Patent Document 2 states, "Inside the heat source chamber, a blower portion for forming an air flow, a heating portion for heating the air flow, and an air flow heated by the heating portion are opposed to the partition wall. A flow that forms a flow path that circulates at least a part of the space in the heat source chamber and then blows out from at least one outlet in the plurality of outlets toward the center of the heating chamber. It is described as "a heating device provided with a path forming portion".

These documents propose a structure that controls the direction of the hot air supplied from the hot air circulation unit to the heating chamber so as to be directed toward the center of the heating chamber so that the hot air does not flow toward the upper and lower wall surfaces of the heating chamber. There is.

Japanese Unexamined Patent Publication No. 2011-163695 International Publication No. 2011/086948

In the heating device described in Patent Document 1, it is described that "the hot air from the hot air outlet can be directed toward the center of the heating chamber" by adjusting the position of the hot air outlet. However, as the fan used in the hot air circulation unit, a centrifugal fan that generates an air flow outward in the radial direction of the fan is used, and even if the position of the hot air outlet is adjusted, the diameter from the fan inside the hot air circulation unit is increased. Since the air flow is generated toward the outside in the direction, the direction of hot air discharge from the hot air outlet tends to be directed toward the outside of the fan. Therefore, since the hot air is supplied from the hot air outlet toward the wall surface of the heating chamber located in the outer direction of the fan, the hot air may heat the wall surface of the heating chamber.

When the wall surface of the heating chamber becomes hotter than necessary, uneven heating of food in the heating chamber occurs, the heating efficiency decreases due to an increase in the amount of heat leakage from the wall surface, and parts arranged near the wall surface are damaged. Sometimes. Further, Patent Document 1 describes prevention of heating of the upper and lower wall surfaces by adjusting the height position of the hot air outlet, but does not consider heating of the left and right wall surfaces.

In addition, if the hot air outlet is placed away from the wall surface so that the hot air faces the center of the heating chamber, the air passage through which the hot air flows changes depending on the positional relationship between the hot air outlet and the square plate, which adversely affects the heating performance. There is. For example, when the air passage is blocked by a square plate or the like, the hot air cannot be distributed throughout the heating chamber, which makes it difficult to supply the hot air required for cooking in the upper and lower ovens. Further, depending on the shape and arrangement position of the food, hot air flows toward the food, which promotes heating of a part of the food and causes uneven heating.

In the heating device described in Patent Document 2, by providing a flow path forming portion near the hot air outlet, "hot air from the outlet is uniformly applied to the object to be heated in the heating chamber, and the wall surface of the heating chamber is covered. It reduces direct heating and performs intensive heating operations on the object to be heated. " However, since the heater is arranged in the back direction of the fan and the direction of the airflow generated in the radial direction of the fan is once bent toward the back side by the flow path forming portion and then blown out toward the heating chamber side, Patent Document 2 describes it. In the structure provided with the flow path forming portion described, the air passage of the flow is complicated, the loss increases, and the air volume may decrease.

In order to efficiently heat the air and bring the temperature distribution in the heating chamber closer to uniform, it is necessary to secure the air volume and circulate the hot air throughout the heating chamber. The air in the heating chamber was not sufficiently agitated, and uneven heating sometimes occurred. Further, since the hot air is supplied toward the center of the heating chamber, the path of the hot air differs depending on the placement position of the food as in Patent Document 1, and in some cases, the hot air flows toward the food and the temperature of a part of the food is reached. In some cases, uneven heating may occur due to the increase in temperature.

Further, if the flow path is widened in order to reduce the loss and adjust the discharge direction of the hot air, the volume of the hot air circulation unit increases and the internal volume of the refrigerator decreases.

The present invention has been made in view of such circumstances, and by generating an air flow from a fan in the direction of the rotation axis and blowing hot air toward substantially the front of the heating chamber while ensuring a circulating air volume. An object of the present invention is to provide a heating cooker capable of highly efficient heating and cooking by suppressing the wall temperature of a heating chamber and suppressing uneven heating of food while performing highly efficient heat exchange between a heater and air. ..

In order to solve the above problems, the heating cooker of the present invention includes a heating chamber for storing food and a hot air circulation unit provided behind the rear wall surface of the heating chamber. The hot air heater that heats the air, the hot air fan that circulates the air in the heating chamber, the hot air motor that drives the hot air fan, the hot air heater and the hot air fan are arranged on the heating chamber side, and the hot air fan is arranged on the back side of the main body. A hot air circulation unit cover on which a hot air motor is arranged is provided, and the hot air circulation unit cover is provided substantially in the center, and surrounds the cover convex surface surrounding the rotating shaft connecting the hot air fan and the hot air motor, and the cover convex surface. At the same time, the cover inclined surface inclined rearward from the cover convex surface, the cover inclined surface, the cover back surface located behind the cover convex surface, and the cover back surface are surrounded, and hot air is guided forward. The outer diameter of the convex surface of the cover is smaller than the outer diameter of the hot air fan, and the convex surface of the cover is 10 mm or more closer to the hot air fan side than the back surface of the cover. Or, a heating cooker that protrudes at least 1/3 of the height of the hot air guide surface.

Further, a heating chamber for storing food and a hot air circulation unit provided behind the rear wall surface of the heating chamber are provided, and the hot air circulation unit heats the air and heats the air in the heating chamber. It is provided with a circulating hot air fan, a hot air motor for driving the hot air fan, and a hot air circulation unit cover in which the hot air heater and the hot air fan are arranged on the heating chamber side and the hot air motor is arranged on the back side of the main body. The hot air circulation unit cover is provided substantially in the center, and has a cover convex surface that surrounds a rotation axis that connects the hot air fan and the hot air motor, and a cover inclination that surrounds the cover convex surface and inclines rearward from the cover convex surface. The cover has a surface, a back surface of the cover that surrounds the inclined surface of the cover and is located behind the convex surface of the cover, and a hot air guide surface that surrounds the back surface of the cover and guides hot air forward. The inner diameter of the inclined surface was smaller than the outer diameter of the hot air fan, and the outer diameter of the cover inclined surface was larger than the outer diameter of the hot air fan.

According to the present invention, the air flow inside the hot air circulation unit is made a flow that suppresses an increase in flow path pressure loss while performing high-efficiency heat exchange between the heater and the air, thereby ensuring the hot air circulation air volume. Since hot air can be blown toward the front of the heating chamber, the wall temperature of the heating chamber is suppressed to reduce the temperature difference in the heating chamber, and heating that enables highly efficient heating and cooking that suppresses uneven heating of food is possible. Can provide a cooker.

The schematic diagram which looked at the heating cooker main body of Example 1 from the right side. The schematic view of the heating cooker main body of FIG. 1 seen from the front side. A perspective view of the hot air circulation unit of the cooking cooker of FIG. 1 as viewed from the upper right on the front side. Front view of the hot air circulation unit of FIG. 3 as viewed from the front side. FIG. 3 is a schematic view of the AA'cross section of the hot air circulation unit of FIG. 3 as viewed from the right side. A perspective view of an example of a hot air fan seen from the upper right of the front side. The schematic view of the oven cooking of Example 1 (two-stage cooking of the upper stage and the lower stage) viewed from the front side. The schematic view of the oven cooking of Example 1 (two-stage cooking of the upper stage and the lower stage) viewed from the right side. The schematic view of the oven cooking of Example 1 (two-stage cooking of a middle stage and a lower stage) viewed from the front side. The schematic view of the oven cooking of Example 1 (two-stage cooking of a middle stage and a lower stage) viewed from the right side. A perspective view of the main body of the cooking cooker of FIG. 1 as viewed from the upper right on the front side. The perspective view of the hot air circulation unit of the cooking apparatus of Example 2 seen from the upper right of the front side. The schematic view of the hot air circulation unit of FIG. 12 as seen from the right side. The perspective view of the hot air circulation unit of the cooking apparatus of Example 3 seen from the upper right of the front side.

Hereinafter, examples of the present invention will be described in detail with reference to the drawings.

The cooking utensil according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 11.

The present invention can also be applied to a single-function oven that does not have a microwave oven heating function, but in the present embodiment described below, a microwave oven heating function that heats food using microwave ovens, and a heater and a fan are used. An embodiment of the present invention will be described using an oven range having both an oven heating function for heating food. Further, the present invention can be adopted regardless of the position of the hot air circulation unit, but in the present embodiment described below, one embodiment of the present invention is used by using a structure provided with the hot air circulation unit behind the heating chamber. Will be explained.
[overall structure]
First, the structure of the main body 1 of the microwave oven (heating cooker) will be described with reference to FIGS. 1, 2, and 11. FIG. 1 is a schematic view of the main body 1 of the cooking cooker of the present embodiment viewed from the right side, FIG. 2 is a schematic view of the main body 1 viewed from the front side, and FIG. 11 is a schematic view of the main body 1 viewed from the upper right side of the front side. It is a perspective view. As shown by the arrows in each figure, the door side is the front and the hot air circulation unit side is the rear with respect to the heating chamber, and the directions of the arrows are also used for explanation in the vertical and horizontal directions.

As shown in these, the main body 1 of the microwave oven includes a heating chamber 2 having an opening at the front, an openable / closable door 11 capable of closing the opening of the heating chamber 2, and a hot air circulation provided behind the rear wall surface of the heating chamber 2. A unit 3 and a machine room 4 provided in the downward direction of the heating room 2 are provided. The door 11 shown here opens and closes by rotating around the lower front side as an axis, but may be a door 11 that rotates about the front side side as an axis. The main body 1 of the microwave oven is formed by covering the heating chamber 2, the machine chamber 4, the hot air circulation unit 3, and the like with the cabinet 10.

Further, a table plate 23 on which a load such as food is placed is arranged on the lower bottom surface of the heating chamber 2. A magnetron 40, a waveguide 41, a rotating antenna 42, an antenna motor 43, and the like are arranged in the machine room 4 below the table plate 23. The microwave generated in the magnetron 40 is transmitted to the rotating antenna 42 via the waveguide 41 and radiated from the rotating antenna 42 driven by the antenna motor 43 to the heating chamber 2 to enter the heating chamber 2. The placed food is heated by microwaves. The heating method using microwaves is called microwave oven heating.

A top heater 24 is installed above the heating chamber 2. It is also possible to heat food by radiant heating by raising the upper surface of the heating chamber 2 to a high temperature by the upper surface heater 24. The heating method using radiant heating is called grill heating.

Further, the rear wall surface of the heating chamber 2 is provided with a hot air outlet 34 and a hot air suction port 35 composed of a large number of round holes, and a hot air circulation unit 3 is installed behind the rear wall surface. The large number of round holes constituting the hot air outlet 34 and the hot air suction port 35 are sized so that air can pass through but microwaves cannot pass through. The hot air circulation unit 3 is composed of a hot air fan 30 installed near the center, a hot air motor 31, two hot air heaters 32 arranged above and below the hot air fan 30, and a hot air circulation unit cover 33 that covers all of them. By rotationally driving the hot air fan 30 with the hot air motor 31, the air in the heating chamber 2 is sucked from the hot air suction port 35, the air is heated by the hot air heater 32, and then the temperature is high in the heating chamber 2 from the hot air outlet 34. It is a structure that supplies the air of the above as hot air. By supplying hot air into the heating chamber 2 and heating the air in the heating chamber 2 to a high temperature, the food is heated by convection heating. Here, a heating method using convection heating with hot air is called oven heating.

Microwave heating is used for cooking that raises the temperature from the inside without coloring the food, oven heating is used for cooking that heats the entire surroundings of the food to give it a baking color, and cooking that colors the surface of the food. Grill heating is used for cooking, and various cooking is possible by combining these heatings.
[Hot air circulation unit configuration]
Here, the detailed structure of the hot air circulation unit 3 of this embodiment will be described with reference to FIGS. 3 to 6. FIG. 3 is a perspective view of the hot air circulation unit 3 viewed from the upper right side of the front side, FIG. 4 is a front view of the hot air circulation unit 3 viewed from the front side, and FIG. 5 is a schematic view of the hot air circulation unit 3 viewed from the right side. .. FIG. 6 is a perspective view of an example of a hot air fan as viewed from the upper right on the front side.

As shown in FIG. 3, in the hot air circulation unit 3, a hot air fan 30 is arranged near the center of the hot air circulation unit cover 33 on the heating chamber side, and two linear hot air heaters 32 are arranged above and below the hot air fan 30. The hot air motor 31 is arranged near the center on the back side of the main body. Then, by connecting the hot air fan 30 and the hot air motor 31 arranged on the same shaft with a rotating shaft, the hot air fan 30 can be rotated when the hot air motor 31 is driven.

Further, the hot air circulation unit cover 33 has a substantially box-shaped shape formed by drawing or pressing, and has a cover plane 33A which is a convex surface surrounding the rotation axis of the hot air fan 30 and an inclination toward the rear from the cover plane 33A. The hot air fan 30 is provided with a cover inclined surface 33D, a cover back surface 33B located behind the convex cover plane 33A, and a hot air guide surface 33E for guiding hot air toward the front hot air outlet 34. The shape is such that the hot air heater 32 can be built in. Further, the back surface 33B of the cover is provided with a wind direction plate 36 for adjusting the wind direction inside the hot air circulation unit 3.

As shown in FIG. 6, the hot air fan 30 is a fan in which a hub and a blade are integrally formed by bending a part of a hub surface 30C which is a metal plate to form a hot air fan blade 30A, and the side of the hot air fan blade 30A. An inter-blade flow path 30B is formed on the side.

As shown in FIG. 5, the cover plane 33A and the cover back surface 33B are planes substantially perpendicular to the rotation axis of the hot air fan 30, and the cover inclined surface 33D is a hot air fan connecting the cover flat surface 33A and the cover back surface 33B. It is a plane inclined with respect to the rotation axis of 30. Then, as shown in FIG. 4, the outer diameter dimension 33AL of the cover plane 33A seen from the front side is made smaller than the outer diameter dimension 30L of the hot air fan 30, and the outer diameter dimension 33DL of the cover inclined surface 33D seen from the front side is made. , The outer diameter of the hot air fan 30 is larger than 30L.

With this configuration, the hot air fan 30 has not only the air flow of arrow 3B having a component in the radial direction but also an axial component flowing to the rear side of the hot air fan 30 through the inter-blade flow path 30B. The air flow of arrow 3A is also generated. Then, the airflow of arrow 3A is sequentially guided by the cover inclined surface 33D, the cover back surface 33B, and the hot air guide surface 33E behind the hot air heater 32, and then combined with the airflow of arrow 3B immediately before the hot air outlet 34. Then, the air flow becomes substantially parallel to the ceiling and bottom surface of the heating chamber 2 and is supplied into the heating chamber 2 from the hot air outlet 34. When the height of the cover plane 33A with respect to the back surface 33B of the cover is 10 mm or more, or when the height is 1/3 or more of the height of the hot air guide surface 33E, sufficient air is provided for the path of arrow 3A. It was confirmed that a flow can be formed and a suitable synthetic air flow can be generated.

Here, in this embodiment, the rotation direction of the hot air fan 30 is not particularly specified, but the direction in which the hot air fan blade 30A generates an air flow in the direction of the inter-blade flow path 30B, that is, the downstream side in the rotation direction of the hot air fan blade 30A. The amount of air flowing from the hot air fan 30 can be increased by rotating the hub surface 30C in the direction of rotation (counterclockwise when viewed from the front in FIGS. 3 and 4 and the direction of rotation 30D in FIGS. 4 and 6). Since a large amount can be secured, the effect of this embodiment can be easily obtained.

Further, the shape of the hot air circulation unit cover 33 includes a cover convex surface (cover plane 33A in this embodiment) smaller than the outer diameter dimension 30L of the hot air fan 30 on the heating chamber 2 side, and a cover back surface 33B on the rear side thereof. However, the smaller the outer diameter of the cover plane 33A seen from the front side, the smaller the area where the cover plane 33A overlaps the inter-blade flow path 30B, and the air volume of the arrow 3A flowing in the rotation axis direction is increased. Can be done. Further, as in the present embodiment, by arranging the hot air motor 31 on the back surface of the cover plane 33A protruding toward the heating chamber 2, the hot air motor 31 can be brought closer to the heating chamber 2, and the depth of the main body 1 as a whole can be obtained. The dimensions can be reduced. Therefore, the outer diameter of the cover plane 33A is a size that allows the hot air motor 31 to enter, and it is desirable that the outer diameter be as small as possible. Further, in this embodiment, the cover flat surface 33A and the cover back surface 33B each have a flat shape perpendicular to the rotation axis of the hot air fan 30, but if at least two types of faces having different depths are provided, the respective faces are not necessarily required. It does not have to be a flat surface, and may be a surface having ribs or a curved surface. Also, it does not have to be perpendicular to the axis of rotation.

Further, the hot air fan blade 30A can be at a right angle (90 °) with respect to the hub surface 30C (a surface substantially perpendicular to the rotation axis near the center of rotation of the fan), but the angle formed by the hot air fan blade 30A and the hub surface 30C. And shape do not matter. In the example shown in FIG. 6, the blade inclination angle 30Aa formed by the hot air fan blade 30A and the hub surface 30C integrally formed with the blade is 90 ° or more. In this case, there is an advantage that the hot air fan blade 30A can be easily cut and raised, and the hot air fan 30 can be easily formed. Further, as shown in FIG. 5, in this embodiment, a part of the hot air suction port 35 overlaps the hot air fan blade 30A, but the position and length of the hot air fan blade 30A do not matter. As described above, the shape of the hot air fan 30 does not matter as long as the hot air fan 30 has a structure that generates an air flow in the direction of the rotation axis from the heating chamber 2 side in the direction of the hot air circulation unit 3.

Next, the positional relationship between the hot air heater 5 and other components will be described in detail with reference to FIG. As shown here, the center 320 of the hot air heater 32 is located in front of the back surface 33B of the cover and behind the hub surface 30C of the hot air fan 30. Further, the center 320 of the upper hot air heater 32 is arranged below the upper hot air outlet 34, and the center 320 of the lower hot air heater 32 is arranged above the lower hot air outlet 34. .. That is, the upper and lower hot air outlets 34 are arranged outside (downstream side) from the center 320 of the hot air heater when viewed from the hot air fan 30.

Due to such a configuration, the air discharged rearward from the hot air fan 30 passes further behind the hot air heater 32 located behind the hot air fan 30 and is arranged outside the hot air heater 32 as shown by the arrow 3A. It reaches the vicinity of the hot air outlet 34. On the other hand, the air discharged from the hot air fan 30 in the outer peripheral direction passes in front of the hot air heater 32 and reaches the vicinity of the hot air outlet 34 as shown by the arrow 3B. The hot air of arrow 3A and the hot air of arrow 3B merge near the hot air outlet 34 to form hot air substantially parallel to the ceiling surface and bottom surface of the heating chamber 2, and are supplied to the heating chamber 2 from the hot air outlet 34.

As described above, by passing the air through both the paths of the arrows 3A and 3B, it is possible to efficiently exchange heat between the air and the heater on the entire surface of the hot air heater 32. Further, as compared with the case where a flow path forming portion or the like is provided to forcibly change the direction of the air flow, there are no obstacles on the air passage and the loss is small, so that a large amount of hot air can flow. Further, it is also possible to further increase the air volume by increasing the rotation speed of the hot air fan 30, and in that case, heat exchange can be performed with higher efficiency by turbulent heat transfer.

As described above, in the structure of the present embodiment, when the hot air motor 31 is driven to rotate the hot air fan 30, air flows from the hot air fan 30 not only in the radial direction of the fan but also in the rotation axis direction. The air that has passed through the hot air suction port 35 from the heating chamber 2 is taken into the hot air circulation unit 3 near the center of rotation of the hot air fan 30, and the air discharged from the hot air fan 30 is heated around the hot air heater 32 and has a high temperature. It becomes the hot air of the above, flows through the inside of the hot air circulation unit 3, and is supplied into the heating chamber 2 from the hot air outlet 34.

Here, in the present embodiment, the hot air circulation unit 3 is formed by the shape of the cover 33 having the cover flat surface 33A and the cover back surface 33B, which are convex surfaces of the cover, and the generation of air flow from the hot air fan 30 toward the rear in the axial direction. As shown in FIG. 5, the hot air supplied from the heating chamber 2 to the heating chamber 2 is naturally supplied in a direction toward the substantially front side of the heating chamber 2, and the hot air inside the heating chamber 2 flows forward along the wall surface.

In a structure in which the hot air circulation unit cover 33 has a substantially flat shape without protrusions and the hot air fan 30 generates an air flow only in the direction perpendicular to the rotation axis as in the prior art, the direction of the hot air at the hot air outlet 34 is There is a problem that food cannot be efficiently heated because the hot air fan 30 is directed toward the radial direction, that is, the upper and lower wall surfaces, and heats the ceiling surface and the bottom surface of the heating chamber.

On the other hand, the structure of the present embodiment is different from the conventional structure in that the direction of the hot air at the hot air outlet 34 is substantially forward. That is, since the hot air emitted from the hot air outlet 34 flows substantially forward without going to the ceiling surface or the bottom surface, the wall surface becomes more than necessary in order to suppress heat exchange with the wall surface of the heating chamber 2. It is possible to prevent heating, efficiently heat the air in the heating chamber 2, and efficiently heat the food. Further, in the present embodiment, since the cover flat surface 33A, which is the convex surface of the cover, is similarly formed not only in the vertical direction but also in the horizontal direction of the hot air fan 30, heat is generated not only on the upper and lower wall surfaces of the heating chamber 2 but also on the left and right wall surfaces. Replacement can be suppressed, and deterioration of food heating efficiency can be suppressed.

Further, in this embodiment, the hot air heaters 32 are formed above and below the hot air circulation unit 3 so that the hot air outlets 34 are located above and below the center 320 of the hot air heater, and holes arranged substantially horizontally. The hot air outlet 34 is arranged. The air flow generated from the hot air fan 30 passes near the rear hot air heater 32 and flows to the hot air outlet 34. Since the hot air heater 32 is arranged on the flow path inside the hot air circulation unit 3, highly efficient heat exchange is possible between the hot air heater 32 and the air, and the heated air is immediately sent from the hot air outlet 34 to the heating chamber. It is possible to efficiently heat the air in the heating chamber. Further, since the hot air heater 32 has a straight rod shape and is arranged at two places above and below, hot air having a uniform temperature can be supplied to the heating chamber in the left and right directions at the two places above and below, so that heating in the upper and lower two-stage ovens can be performed. Unevenness can be suppressed.
[Cooking method]
Next, a cooking method at the time of oven heating, in which food is cooked by convection heating, will be described with reference to FIGS. 7 to 10. FIG. 7 is a schematic view of oven cooking using the upper shelf and the lower shelf from the front side, FIG. 8 is a schematic view of oven cooking using the upper shelf and the lower shelf from the right side, and FIG. 9 is a middle shelf. FIG. 10 is a schematic view of oven cooking using the lower shelf and the front side, and FIG. 10 is a schematic view of oven cooking using the middle shelf and the lower shelf from the right side.

At the time of oven heating, a metal square plate 22 is installed on the shelves 21 provided on both the left and right wall surfaces of the heating chamber 2, and the food 20 to be heated is arranged on the square plate 22. By arranging the food 20 on the square plate 22 and heating the air around the food 20 to a high temperature, the entire food 20 can be heated.

In FIGS. 7 to 10, the food 20 is bread (butter roll), and in FIGS. 7 and 8, the case where the food is cooked in the upper and lower two stages, and in FIGS. 9 and 10, the middle and lower 2 stages are used. The case of cooking by heating in the stage is shown respectively.

After arranging the food 20 on the square plate 22, when heating is instructed on the operation panel (not shown), a predetermined current flows through the hot air heater 32 to generate heat, and at the same time, the hot air fan 30 is driven by the hot air motor 31. Rotates to generate an internal air circulation flow between the heating chamber 2 and the hot air circulation unit 3. Specifically, the air between the upper and lower two-stage square plates is sucked into the hot air circulation unit 3 from the hot air suction port 35, the air is heated by the hot air heater 32, and then the air (hot air) heated to a high temperature is moved up and down. It is supplied from the hot air outlet 34 of the above to the upper side of the upper square plate and the lower part of the lower square plate. The temperature inside the heating chamber 2 rises by repeating the suction of air to the hot air circulation unit 3 and the supply of hot air to the heating chamber 2 to circulate the high temperature air. The temperature inside the heating chamber 2 is grasped by a temperature sensor (not shown), and the air in the heating chamber 2 is maintained at a high temperature according to the conditions (temperature, time, etc.) instructed by the user to heat the food 20. Cook.

In this embodiment, the hot air supplied from the hot air outlet 34 into the heating chamber 2 flows toward substantially the front of the heating chamber 2. Therefore, even when the square plate 22 and the food 20 are arranged, the hot air supplied from the hot air outlet 34 does not hit the food 20 and flows to the vicinity of the door 11 in front of the heating chamber 2 and wraps around the square plate 22. A circulation air passage is formed between the heating chamber 2 and the hot air circulation unit 3 by flowing to the hot air suction port 35 behind the heating chamber 2 and being sucked into the hot air circulation unit 3 again. When the hot air reaches the front of the heating chamber 2, the hot air spreads throughout the heating chamber 2, and the temperature difference inside the heating chamber 2 can be reduced. Further, since the hot air flows substantially forward from the hot air outlet 34, the square plates are arranged in the upper and lower stages as shown in FIGS. 7 and 8, and the square plates are arranged in the middle stage as shown in FIGS. 9 and 10. Hot air flows in the same way regardless of whether it is placed in the lower stage. Therefore, it is possible to cook by suppressing uneven heating regardless of the arrangement of foods and square plates.
[Characteristics and effects of composition]
When hot air is supplied toward the wall surface, heat exchange is performed between the hot air and the wall surface to heat the wall surface, and the wall surface temperature may become extremely high compared to the air temperature and food temperature in the heating chamber. The temperature of food near the wall surface and other areas was different, and uneven heating sometimes occurred. In addition, when the wall surface becomes extremely hot, parts such as sensors and substrates installed around the wall surface may become hot and difficult to cool. In addition, when a partition is provided in the middle of the flow path to create the flow path, the flow path becomes complicated, so that the air passage resistance and loss increase, the air volume decreases, and the air temperature difference around the food increases, resulting in heating. The unevenness sometimes worsened. When hot air is supplied toward the center of the heating chamber 2, when the food 20 is placed on the square plate 22 and installed on the shelf 21, the hot air is when the food 20 is a low-height food such as a cookie. Flows above the food 20.

However, as shown in this embodiment, when the food 20 is a high-height food such as bread, the hot air hits the food 20, so that only the portion exposed to the hot air becomes hot, and conversely, the heating chamber 2 Since hot air did not flow in front of the heating chamber 2, the temperature did not rise, and a temperature distribution sometimes occurred before and after the heating chamber 2. That is, the air flow path inside the heating chamber 2 changes depending on the height of the food 20, and the temperature distribution differs, which causes uneven heating.

In this embodiment, the hot air fan 30 is a fan that also generates an air flow in the direction of the rotation axis, and due to the shape of the hot air circulation unit cover 33 provided with the convex surface of the cover, the hot air behind the hot air fan 30 is inside the hot air circulation unit 3. Hot air passes through the vicinity of the heater 32 and is supplied to the heating chamber 2 from the hot air outlet 34. Therefore, the hot air supplied to the heating chamber 2 flows not toward the wall surface or toward the center of the heating chamber but toward the front of the heating chamber 2, so that even heating cooking is possible. Since heat exchange due to hot air flowing toward the wall surface can be suppressed, the wall surface does not become hotter than necessary, parts can be easily cooled, the amount of heat radiation is suppressed, and the air can be heated efficiently. is there. Further, since the loss of the internal flow path of the hot air circulation unit 3 is low and the hot air can be appropriately flowed behind the hot air heater 32, the heat exchange between the air and the hot air heater 32 is promoted and the air is heated efficiently. Can be done. Therefore, the decrease in air volume due to pressure loss is small, and efficient heating can be performed with a large air volume. In addition, it is not easily affected by the arrangement of the square plate 22 and the food 20 or the height of the food 20, and the structure is such that hot air reaches the front of the heating chamber 2 for any food shape. However, it is easy to suppress uneven heating. Further, since the hot air flows substantially forward, it is possible to suppress heating not only on the upper and lower wall surfaces but also on the left and right wall surfaces.

As described above, by using the heating cooker of this embodiment, efficient oven cooking with suppressed heating unevenness becomes possible.
[Other configurations]
Here, in the hot air circulation unit 3 of the present embodiment, the shape of the hot air circulation unit cover 33 is a throttle shape that avoids the hot air motor 31, and a part of the hot air motor 31 is arranged inside the throttle shape. .. Therefore, the thickness of the hot air circulation unit 3 can be reduced and the depth of the entire main body 1 can be reduced as compared with a configuration in which the hot air circulation unit cover 33 is not provided with a throttle shape.

In this embodiment, the shape and number of hot air heaters 32 are not limited, but in this embodiment, two hot air heaters 32 are installed above and below the hot air fan 30, so that each heater is independent. Can be driven. For example, it is possible to drive only the lower hot air heater 32 to perform cooking on the lower side of the square plate 22, that is, with a strong lower heat. Further, in order to raise the temperature in the heating chamber 2 quickly, it is effective to increase the output of the hot air heater 32, and since the power of the household power supply is defined as 1500 W, the total of the hot air heater 32 is specified. The heating rate can be improved by setting the output to about 1400 W. However, in that case, the hot air heater 32 could not be driven at the same time as another heat source. In this embodiment, since the two hot air heaters 32 can be driven independently, it is possible to simultaneously drive and cook the hot air heater 32 on one side and the upper surface heater 24, for example.

Further, as shown in FIG. 5, the shape of the hot air circulation unit cover 33 in this embodiment includes a flange-shaped flat surface located near the center of the cover flat surface 33A and behind the cover flat surface 33A, and the hot air motor is provided on this flat surface. 31 is fixed. As described above, the hot air circulation unit cover 33 may be provided with other surfaces as long as it includes at least a cover flat surface 33A and a cover back surface 33B which are convex surfaces of the cover.

The structure of Example 2 of the present invention will be described with reference to FIGS. 12 and 13. FIG. 12 is a perspective view of the hot air circulation unit of the cooking device of the second embodiment as viewed from above the front surface. FIG. 13 is a schematic view of the hot air circulation unit as viewed from the side surface side. The cooking cooker of this embodiment has the same structure as that described in Example 1 except for the hot air circulation unit 3, and the description of the same structure as that of Example 1 will be omitted.

In this embodiment, the shape of the cover convex surface 33C of the hot air circulation unit cover 33 is different from that of the first embodiment. Specifically, in the first embodiment, the cover plane 33A was a substantially quadrangular shape, but in the second embodiment, the diaphragm shape including the cover convex surface 33C has a substantially circular cross section when viewed from the front side, and has no flat surface and is a curved surface. It is a constructed shape.

Since the shape of the cover convex surface 33C is different from that of the first embodiment, the direction of the air flow around the hot air fan 30 is different, but the air flow from the hot air fan 30 through the inter-blade air passage 30B is generated, so that the first embodiment Similarly, the effect of supplying hot air to the heating chamber substantially forward can be obtained. As described above, the shape of the cover convex surface 33C may be any shape as long as it is provided on the heating chamber 2 side with respect to the cover back surface 33B.

Further, since the throttle depth of the cover back surface 33B is deep and the distance between the cover convex surface 33C and the cover back surface 33B is long, the air passage resistance inside the hot air circulation unit 3 is reduced, which has the effect of increasing the circulating air volume of hot air. can get.

As described above, in the present embodiment, the cover convex surface 33C is provided on the heating chamber 2 side and the cover back surface 33B is provided behind the cover convex surface 33C, air flows in the axial direction of the hot air fan 30, and an air passage is provided behind the hot air fan 30. The shape of the hot air circulation unit cover 33 may be any shape as long as the air flow is appropriately flowed through the hot air heater 32 and the hot air is supplied substantially in front of the heating chamber 2.

The structure of Example 3 of the present invention will be described with reference to FIG. FIG. 14 is a perspective view of the hot air circulation unit of the cooking cooker of Example 3 as viewed from above the front surface. The cooking cooker of this embodiment has the same structure as that described in Example 1 except for the hot air circulation unit 3, and the description of the same structure as that of Example 1 will be omitted.

In this embodiment, the shape of the hot air heater 32 and the shape of the cover plane 33A of the hot air circulation unit 3 are different from those of the first embodiment. Specifically, in the first embodiment, the hot air heater 32 is a heater having a substantially linear shape, and two are arranged above and below the hot air heater 32, but the hot air heater 32 of the third embodiment is one substantially circular heater. Is. Further, the cover plane 33A of the first embodiment has a substantially quadrangular shape, but the cover plane 33A of the third embodiment has a substantially circular shape.

Since the cover plane 33A is substantially circular and the hot air heater 32 is also substantially circular, the air flow generated by the hot air fan 30 uniformly hits the hot air heater 32, and the entire hot air heater 32 can efficiently exchange heat. ..

As described above, in the present embodiment, the shape and number of the hot air heaters 32 do not matter as long as they are arranged on the flow path of the hot air flowing from the hot air fan 30 to the hot air outlet 34.

1: Body,
10: Cabinet,
11: Door,
2: Heating room,
20: Food,
21: Shelf,
22: Square plate,
23: Table plate,
24: Top heater,
3: Hot air circulation unit,
3A: Flow path,
30: Hot air fan,
30A: Hot air fan wings,
30Aa: Wing tilt angle,
30B: Interwing flow path,
30C: Hub surface,
30L: Outer diameter of hot air fan,
31: Hot air motor,
32: Hot air heater,
320: Center of hot air heater,
33: Hot air circulation unit cover,
33A: Cover plane,
33B: The back of the cover,
33C: Convex cover,
33D: Cover slope,
33E: Hot air guide surface,
33AL: Outer diameter dimension of the cover plane,
33DL: Outer diameter dimension of cover inclined surface,
34: Hot air outlet,
35: Hot air suction port,
36: Wind direction plate,
4: Machine room,
40: Magnetron,
41: Waveguide,
42: Rotating antenna,
43: Antenna motor

Claims (6)

A heating cooker including a heating chamber for storing food and a hot air circulation unit provided behind the rear wall surface of the heating chamber.
The hot air circulation unit is
Two upper and lower hot air heaters that heat the air,
A hot air fan that is arranged between the upper and lower hot air heaters and circulates air in the heating chamber, and
A hot air motor that drives the hot air fan,
A hot air circulation unit cover in which the hot air heater and the hot air fan are arranged on the heating chamber side and the hot air motor is arranged on the back side of the main body is provided.
The hot air circulation unit cover is
A cover convex surface that is provided substantially in the center and surrounds a rotating shaft that connects the hot air fan in the front and the hot air motor in the rear.
A cover inclined surface that surrounds the cover convex surface and is inclined rearward from the cover convex surface to guide the air flow generated by the hot air fan to the rear of the hot air heater .
A cover back surface that surrounds the cover inclined surface and is located behind the cover convex surface and guides the air flow guided by the cover inclined surface to the hot air heater .
A hot air guide surface that surrounds the back surface of the cover and guides the hot air heated by the hot air heater to the upper or lower hot air outlet provided on the rear wall surface of the heating chamber.
A wind direction plate provided on the back surface of the cover that divides the inside of the hot air circulation unit into upper and lower parts.
Have and
The outer diameter of the convex surface of the cover is smaller than the outer diameter of the hot air fan, and
A cooking cooker characterized in that the convex surface of the cover protrudes from the back surface of the cover toward the hot air fan side by 10 mm or more, or 1/3 or more of the height of the hot air guide surface. A heating cooker including a heating chamber for storing food and a hot air circulation unit provided behind the rear wall surface of the heating chamber.
The hot air circulation unit is
Two upper and lower hot air heaters that heat the air,
A hot air fan that is arranged between the upper and lower hot air heaters and circulates air in the heating chamber, and
A hot air motor that drives the hot air fan,
A hot air circulation unit cover in which the hot air heater and the hot air fan are arranged on the heating chamber side and the hot air motor is arranged on the back side of the main body is provided.
The hot air circulation unit cover is
A cover convex surface that is provided substantially in the center and surrounds a rotating shaft that connects the hot air fan in the front and the hot air motor in the rear.
A cover inclined surface that surrounds the cover convex surface and is inclined rearward from the cover convex surface to guide the air flow generated by the hot air fan to the rear of the hot air heater .
A cover back surface that surrounds the cover inclined surface and is located behind the cover convex surface and guides the air flow guided by the cover inclined surface to the hot air heater .
A hot air guide surface that surrounds the back surface of the cover and guides the hot air heated by the hot air heater to the upper or lower hot air outlet provided on the rear wall surface of the heating chamber.
A wind direction plate provided on the back surface of the cover that divides the inside of the hot air circulation unit into upper and lower parts.
Have and
The inner diameter of the cover inclined surface is smaller than the outer diameter of the hot air fan.
A cooking cooker characterized in that the outer diameter of the cover inclined surface is larger than the outer diameter of the hot air fan. The heating cooker according to claim 1 or 2, wherein the hot air fan has a blade inclination angle of 90 degrees or more formed by a blade and a hub surface integrally formed with the blade. The heating cooker according to any one of claims 1 to 3, wherein the outer diameter of the hot air motor when the hot air circulation unit is viewed from the front surface is smaller than the outer diameter of the convex surface of the cover. Claims 1 to 4, wherein the hot air outlets arranged substantially horizontally on the rear wall surface of the heating chamber are arranged above and below the hot air fan with respect to the height center of the hot air heater. The heating cooker according to any one item. The heating cooker according to any one of claims 1 to 5, wherein the convex surface of the cover is a flat surface or a curved surface.

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