JP2018179381A - Heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating cooker which has reduced a temperature difference in a heating chamber by suppressing a wall temperature in heating, while performing highly efficient heat exchange between a heater and air, as hot air can be blown out substantially frontward so that the hot air does not hit food or the wall surface while securing a hot air circulation air amount, and which can perform highly efficient heating cooking in which uneven heating of the food is suppressed.SOLUTION: A heating cooker includes a heating chamber and a hot air circulation unit. A hot air circulation unit cover is provided substantially at the center and it includes: a cover protrusion surface for surrounding a rotary shaft for connecting a hot air fan and a hot air motor; a cover inclined surface inclining backward from the cover protrusion surface; a cover back surface positioned further backward than the cover protrusion surface; and a hot air guide surface for guiding the hot air frontward. An inner diameter of the cover inclined surface is smaller than an outer diameter of the hot air fan, and an outer diameter of the cover inclined surface is larger than the outer diameter of the hot air fan.SELECTED DRAWING: Figure 1

Description

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

  Conventionally, in the oven range which is a typical cooking device of this type, food is cooked by heating the heating chamber to a high temperature by a heater. Moreover, in some oven ranges, in order to enable upper and lower two-stage oven cooking, a structure in which the air in the heating chamber is agitated using a fan is employed. Specifically, a hot air circulation unit including a fan and a heater is disposed outside the back surface or side of the heating chamber, air drawn from the heating chamber to the hot air circulation unit is heated by the heater, and the hot air heated to high temperature is heated. A hot air circulation system for supplying indoors is generally used.

  When performing two-stage oven cooking, place two square dishes in the heating chamber, suck air from the central space between the square dishes into the hot air circulation unit, and then open the space outside the square dishes, That is, hot air is supplied to the upper and lower two portions of the upper and lower portions of the upper and lower square plates. Such a hot air circulation unit is a structure that mainly sucks air from a substantially central portion of a fan, heats the sucked air, and then blows hot air 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 the air in the centrifugal direction of the fan is disposed near the center of the hot air circulation unit, and a heater is disposed around the fan. A hot air outlet is provided on the wall between the hot air circulation unit and the heating chamber, and the 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 has a flow path flowing in the direction of the upper and lower wall surfaces of the heating chamber.

  Generally, when heating air with a heater, the heater is disposed on the air path blown out from the fan in order to perform heat exchange efficiently. If the heater is provided in the vicinity of the heating chamber, not only the air but also the heating chamber wall near the heater is heated by radiant heat, and the wall temperature becomes high and causes heating unevenness, so the heater is separated to some extent from the heating chamber wall It is arranged in the position. On the other hand, if the wind speed around the heater is increased, heat exchange with the heater is promoted to efficiently heat the air, but if the wind speed is simply increased, the hot air is supplied to the heating chamber when the hot air is supplied. Could be discharged toward the upper and lower wall surfaces of the heating chamber.

  As background art of this technical field, there is patent documents 1. In this publication, “the suction port is provided at approximately equally spaced positions from the two side walls, and the blow-out port is an intermediate portion between the peripheral edge of the partition wall and the suction port where the partition wall contacts the side wall. It is described as "a heating device provided near and in contact with the partition in the vicinity of the blowout port".

  Further, in Patent Document 2, “In the inside of the heat source chamber, an air blowing unit that forms an air flow, a heating unit that heats the air flow, and an air flow heated by the heating unit are opposed to the partition wall. Flow in the direction of the target surface to circulate at least a part of the space inside the heat source chamber, and then form a flow path for blowing out toward the center of the heating chamber from at least one of the plurality of outlets. It is described as "a heating device provided with a path forming portion".

  In these documents, a structure is proposed in which the direction of the hot air supplied from the hot air circulation unit to the heating chamber is controlled to be directed to the vicinity of 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.

JP, 2011-163695, A International Publication No. 2011/086948

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

  And if the wall surface of the heating chamber becomes high temperature more than necessary, the generation of uneven heating of the food in the heating chamber, the decrease of the heating efficiency due to the increase of the heat leakage from the wall surface, and the damage of the parts arranged near the wall surface occur. Sometimes. Moreover, although patent document 1 describes prevention of heating of the upper and lower wall surfaces by adjustment of the height position of a hot air blower outlet, it is not considered about heating of right and left wall surfaces.

  Also, when the hot air outlet is disposed away from the wall surface so that the hot air is directed to the center of the heating chamber, the air flow path of the hot air 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 can not be spread over the entire heating chamber, which makes it difficult to supply the hot air necessary for the upper and lower two-stage oven cooking. In addition, depending on the shape and arrangement position of the food, the flow of the hot air toward the food promotes heating of a part of the food to cause uneven heating.

  In the heating device described in Patent Document 2, by providing the flow path forming portion in the vicinity of the hot air outlet, “the 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 It is described that direct heating is reduced to perform intensive heating operation on the object to be heated. However, since the heater is disposed in the back direction of the fan and the direction of the air flow generated in the radial direction of the fan is temporarily bent back by the flow path forming portion and then blown out toward the heating chamber, Patent Document 2 In the structure provided with the flow path forming portion described, the flow path of the flow is complicated, the loss is increased, and the air volume may be reduced.

  In order to heat the air efficiently and to make the temperature distribution in the heating chamber uniform, it is necessary to secure the air volume and circulate the hot air throughout the heating chamber, but the installation of the flow path forming part reduces the air volume, The air in the heating chamber may not be sufficiently stirred, which may cause uneven heating. Also, in order to supply the hot air toward the center of the heating chamber, the path of the hot air differs depending on the position where the food is placed 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 In some cases, uneven heating may occur due to the increase of

  In addition, if the flow path is wide to reduce loss and adjust the discharge direction of the hot air, the volume of the hot air circulation unit increases and the internal volume decreases.

  The present invention has been made in view of such circumstances, and by generating an air flow from the fan in the rotational axis direction and blowing hot air substantially forward of the heating chamber while securing a circulating air volume, It is an object of the present invention to provide a heating cooker capable of highly efficient heating and cooking with suppressed unevenness in heating of food by suppressing the wall temperature of the heating chamber 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 comprises a heating chamber for storing food and a hot air circulation unit provided behind a rear wall surface of the heating chamber, and the hot air circulation unit comprises A hot-air heater for heating air, a hot-air fan for circulating air in the heating chamber, a hot-air motor for driving the hot-air fan, the hot-air heater and the hot-air fan on the heating chamber side, A hot air circulation unit cover provided with a hot air motor, wherein the hot air circulation unit cover is provided substantially at the center, and a cover convex surface surrounding a rotary shaft connecting the hot air fan and the hot air motor and a cover convex surface In addition, a cover inclined surface inclined rearward from the cover convex surface, a cover rear surface surrounding the cover inclined surface and positioned rearward of the cover convex surface, and the cover rear surface The cover has a hot air guide surface for guiding hot air forward, and the outer diameter of the cover convex surface is smaller than the outer diameter of the hot air fan, and the cover convex surface is smaller than the cover rear surface. In the heating cooker, 10 mm or more on the side of the hot air fan or 1/3 or more of the height of the hot air guide surface is projected.

  A heating chamber for storing food and a hot air circulation unit provided behind a rear wall surface of the heating chamber, the hot air circulation unit includes a hot air heater for heating air, and air in the heating chamber. A hot-air circulation unit cover comprising a circulating hot-air fan, a hot-air motor for driving the hot-air fan, the hot-air heater and the hot-air fan on the heating chamber side, and the hot-air motor on the back side of the body. The hot air circulation unit cover is provided substantially at the center, and a cover convex that surrounds the rotation axis connecting the hot air fan and the hot air motor, and a cover inclination that surrounds the cover convex and inclines backward from the cover convex A hot air that surrounds the cover sloped surface and covers the back of the cover positioned behind the convex surface of the cover and the back of the cover and guides the hot air forward An inner surface of the cover inclined surface is smaller than an outer diameter of the hot air fan, and an outer diameter of the cover inclined surface is larger than an outer diameter of the hot air fan; did.

  According to the present invention, the air flow inside the hot air circulation unit is subjected to heat exchange between the heater and the air with high efficiency, and the flow pressure loss increase is suppressed, thereby securing the hot air circulation air volume. Since hot air can be blown out substantially in front of the heating chamber, the wall temperature of the heating chamber can be suppressed to reduce the temperature difference in the heating chamber, and highly efficient heating and cooking with suppressed uneven heating of food can be performed. Can provide a cooker.

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

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

  The heating cooker of Example 1 of this invention is demonstrated using FIGS. 1-11.

The present invention is also applicable to a single function oven having no range heating function, but in the present embodiment described below, a range heating function for heating food using microwaves, a heater and a fan are used. One embodiment of the present invention will be described using an oven oven equipped with both oven heating functions to heat food. Although the present invention can be adopted regardless of the position of the hot air circulation unit, in the present embodiment described below, an embodiment of the present invention is provided using the structure provided with the hot air circulation unit behind the heating chamber. Explain.
[overall structure]
First, the structure of the main body 1 of the oven range (heating cooker) will be described using FIGS. 1, 2 and 11. FIG. 1 is a schematic view of the main body 1 of the heating cooker of this embodiment as viewed from the right side, FIG. 2 is a schematic view of the main body 1 as viewed from the front side, and FIG. It is a perspective view. In addition, as shown by the arrow in each figure, the door side is forward with respect to a heating chamber, the hot-air circulation unit side is back, and the direction of the arrow is used for description also about upper and lower, right and left.

  As shown in these figures, the main body 1 of the oven oven is provided with a heating chamber 2 opened at the front, an openable door 11 capable of closing the opening of the heating chamber 2, and hot air circulation provided behind the rear wall of the heating chamber 2. A unit 3 and a machine room 4 provided below the heating room 2 are provided. The door 11 shown here is opened and closed by pivoting about the front lower side, but may be pivoted about the front side. The heating chamber 2, the machine chamber 4, the hot air circulation unit 3 and the like are covered with the cabinet 10 to constitute the main body 1 of the oven range.

  Further, a table plate 23 on which the load of food or the like is placed is disposed on the lower bottom surface of the heating chamber 2. In the machine room 4 below the table plate 23, a magnetron 40, a waveguide 41, a rotating antenna 42, an antenna motor 43 and the like are arranged. The microwaves generated in the magnetron 40 are transmitted to the rotary antenna 42 through the inside of the waveguide 41, and are radiated from the rotary antenna 42 driven by the antenna motor 43 to the heating chamber 2, thereby being introduced into the heating chamber 2. The placed food is heated by microwave. The heating method using a microwave is called range heating.

  In addition, an upper surface heater 24 is installed above the heating chamber 2. By heating the upper surface of the heating chamber 2 to a high temperature by the upper surface heater 24, it is also possible to heat the food by radiation heating. In addition, the heating method using radiation heating is called grill heating.

  Further, the rear wall of the heating chamber 2 is provided with a hot air outlet 34 and a hot air inlet 35 constituted by a large number of round holes, and the hot air circulation unit 3 is installed behind the rear wall. The large number of round holes constituting the hot air blowout port 34 and the hot air suction port 35 are sized to pass air but not pass microwaves. The hot air circulation unit 3 includes a hot air fan 30, a hot air motor 31, two hot air heaters 32 disposed above and below the hot air fan 30, and a hot air circulation unit cover 33 covering the whole of them. The air in the heating chamber 2 is sucked from the hot air suction port 35 by rotationally driving the hot air fan 30 by the hot air motor 31, and the air is heated by the hot air heater 32. The air of the above is supplied 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 by hot air is referred to as oven heating.

Food is not heated to the internal temperature of the food from the entire range around the food heating oven to heat the entire surface of the food, baking the surface of the food A variety of cooking methods are possible by combining grills using grill heating.
[Hot air circulation unit configuration]
Here, the detailed structure of the hot air circulation unit 3 of the present embodiment will be described with reference to FIGS. 3 to 6. 3 is a perspective view of the hot air circulation unit 3 viewed from the front upper right, FIG. 4 is a front view of the hot air circulation unit 3 viewed from the front, and FIG. 5 is a schematic view of the hot air circulation unit 3 viewed from the right . FIG. 6 is a perspective view of an example of a hot air fan as viewed from the front upper right.

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

  The hot air circulation unit cover 33 has a substantially box-like shape formed by drawing or pressing, and is inclined toward the rear from the cover plane 33A which is a convex surface surrounding the rotation axis of the hot air fan 30, and from the cover plane 33A. And a hot air guide surface 33E for guiding hot air toward the front of the hot air outlet 34, so as to provide the hot air fan 30 and the like. The shape is such that the hot air heater 32 can be incorporated. In addition, a wind direction plate 36 for adjusting the wind direction inside the hot air circulation unit 3 is provided on the cover back surface 33B.

  The hot air fan 30, as shown in FIG. 6, is a fan having a hub and wings integrally formed by bending a part of the hub surface 30C, which is a metal plate, to form the hot air fan vanes 30A. An inter-blade flow passage 30B is formed on one side.

  As shown in FIG. 5, the cover flat surface 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 rear surface 33B. It is a plane inclined to the 30 rotation axes. Then, as shown in FIG. 4, the outside diameter dimension 33AL of the cover flat surface 33A viewed from the front side is smaller than the outside diameter dimension 30L of the hot air fan 30, and the outside diameter dimension 33DL of the cover inclined surface 33D viewed from the front side The outside diameter size 30L of the hot air fan 30 is made larger.

  With this configuration, the hot air fan 30 has not only the air flow of the arrow 3B mainly having the radial direction component, but also the axial direction component flowing to the rear side of the hot air fan 30 through the inter-blade flow passage 30B. The air flow of the arrow 3A is also generated. Then, the air flow of the arrow 3A flows in the rear of the hot air heater 32 sequentially guided by the cover inclined surface 33D, the cover back surface 33B, and the hot air guide surface 33E and then combines with the air flow of the arrow 3B just before the hot air outlet 34. The air flow substantially parallel to the ceiling and the bottom of the heating chamber 2 is supplied from the hot air outlet 34 into the heating chamber 2. When the height of the cover plane 33A with respect to the cover back surface 33B 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 for the path of the arrow 3A. It has been determined that a flow can be formed and a suitable synthetic air flow can be generated.

  Here, in the present embodiment, the rotational direction of the hot air fan 30 is not particularly defined, but a direction in which the hot air fan blades 30A generate a flow of air in the inter-blade flow path 30B direction, that is, the downstream direction of the hot air fan blades 30A. If the hub surface 30C is located in the direction of rotation (counterclockwise as viewed from the front in FIGS. 3 and 4 and in the direction of rotation 30D in FIGS. 4 and 6), the amount of air flowing from the hot air fan 30 Since many can be secured, it is easy to obtain the effect of this embodiment.

  Further, the shape of the hot air circulation unit cover 33 is provided with a cover convex surface (in the present embodiment, the cover flat surface 33A) smaller than the outer diameter dimension 30L of the hot air fan 30 on the heating chamber 2 side and the cover back surface 33B on the rear side. The shape does not matter, but the smaller the outer diameter of the cover flat 33A viewed from the front, the smaller the area in which the cover flat 33A overlaps the inter-blade flow passage 30B becomes, and the air volume of the arrow 3A flowing in the rotational axis direction increases. Can. Further, as in the present embodiment, the hot air motor 31 can be brought close to the heating chamber 2 by arranging the hot air motor 31 on the back surface of the cover flat surface 33A projecting to the heating chamber 2 side, and the depth of the main body 1 as a whole The dimensions can be reduced. Therefore, the outer diameter of the cover plane 33A is preferably as small as possible so that the hot air motor 31 can enter. Further, in the present embodiment, the cover flat surface 33A and the cover back surface 33B are each a flat shape perpendicular to the rotation axis of the hot air fan 30, but if at least two types of different depths are provided, the respective surfaces are not necessarily limited. It does not need to be a plane, and may be a surface provided with a rib or a curved surface. Also, it need not be perpendicular to the axis of rotation.

  Further, although the hot air fan blade 30A can be perpendicular (90 °) to the hub surface 30C (surface substantially perpendicular to the rotation axis near the fan rotation center), the angle between the hot air fan blade 30A and the hub surface 30C There is no limitation on the shape. In the example shown in FIG. 6, the blade inclination angle 30Aa formed with 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 the present embodiment, a part of the hot air suction port 35 overlaps the hot air fan blade 30A, but the position and the 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 generates a flow of air in the rotational axis direction from the heating chamber 2 side toward the hot air circulation unit 3 direction.

  Next, the positional relationship between the hot air heater 5 and the 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 forward of the cover back surface 33 B and rearward of the hub surface 30 C of the hot air fan 30. Further, the center 320 of the upper hot air heater 32 is disposed below the upper hot air outlet 34, and the center 320 of the lower hot air heater 32 is disposed above the lower hot air outlet 34. . That is, the upper and lower hot air outlets 34 are disposed outside (downstream side) the center 320 of the hot air heater as viewed from the hot air fan 30.

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

  As described above, it is possible to efficiently exchange heat between the air and the heater over the entire surface of the hot air heater 32 by the air passing through both the arrows 3A and 3B. Further, compared to the case where the flow path forming portion is provided to forcibly change the direction of the air flow, there is no obstacle on the air path and the loss is small, so a large amount of hot air can be flowed. Further, it is also possible to further increase the air volume by increasing the rotational 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, an air flow is generated from the hot air fan 30 in the rotational axis direction in addition to the radial direction of the fan. The air passing from the heating chamber 2 through the hot air suction port 35 is sucked into the hot air circulation unit 3 near the rotation center of the hot air fan 30, and the air discharged from the hot air fan 30 is heated around the hot air heater 32, The hot air circulates in the hot air circulation unit 3 and is supplied from the hot air outlet 34 into the heating chamber 2.

  Here, in the present embodiment, the shape of the cover 33 provided with the cover flat surface 33A and the cover back surface 33B, which are the convex surface of the cover, and the air flow directed rearward from the hot air fan 30 in the axial direction generate the hot air circulation unit 3 The hot air supplied to the heating chamber 2 is naturally supplied in a direction toward the substantially forward side of the heating chamber 2 as shown in FIG. 5, and the hot air inside the heating chamber 2 flows forward along the wall surface.

  As in the prior art, in the structure in which the hot air circulation unit cover 33 has a substantially flat shape without a protrusion and the hot air fan 30 generates an air flow only in the direction perpendicular to the rotation axis, the direction of the hot air at the hot air outlet 34 is There is a problem that the food can not be efficiently heated because the ceiling surface and the bottom surface of the heating chamber are heated from the hot air fan 30 in the radial direction, that is, the upper and lower wall surface direction.

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

Further, in the present embodiment, two hot air heaters 32 and holes substantially horizontally arranged on the upper and lower sides of the hot air circulation unit 3 are arranged so that the hot air outlets 34 are located on the upper and lower outer sides than the hot air heater center 320. A hot air outlet 34 is disposed. 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 disposed on the flow passage inside the hot air circulation unit 3, heat can be exchanged between the hot air heater 32 and the air with high efficiency, and the heated air is immediately heated from the hot air outlet 34 to the heating chamber. It is possible to heat the air in the heating chamber efficiently. In addition, since the hot air heaters 32 are arranged in the shape of a straight rod at two places in the upper and lower portions, it is possible to supply heated air having a uniform temperature in the left and right directions at two places in the upper and lower portions. Unevenness can be suppressed.
[Cooking method]
Next, the cooking method in the case of the oven heating which cooks a foodstuff by convection heating is demonstrated using FIGS. 7-10. FIG. 7 is a schematic view of oven cooking using the upper and lower shelves viewed from the front, FIG. 8 is a schematic view of oven cooking using the upper and lower shelves from the right, and FIG. 9 is a middle shelf And the schematic diagram which looked at oven cooking using a lower shelf from the front side, FIG. 10 is the schematic diagram which looked at oven cooking using a middle shelf and a lower shelf from the right side.

  At the time of oven heating, the metal square plate 22 is placed on the shelves 21 provided on the left and right wall surfaces of the heating chamber 2, and the food 20 to be heated is placed on the square plate 22. By placing 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 cases of cooking in two stages, upper and lower, are shown in FIGS. 9 and 10; The cases of cooking by stages are shown respectively.

  After placing the food 20 on the square plate 22 and instructing cooking 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 motor 30 drives the hot air fan 30. Rotates to generate a circulating flow of air between the heating chamber 2 and the hot air circulating unit 3. Specifically, after the air between the upper and lower two stages of the square plate is sucked from the hot air suction port 35 into the hot air circulation unit 3 and heated by the hot air heater 32, the air heated at high temperature (hot air) is The air is supplied from the hot air outlet 34 to the upper side of the upper square plate and the lower side of the lower square plate. By repeating the suction of air to the hot air circulation unit 3 and the supply of hot air to the heating chamber 2 and circulating high temperature air, the temperature inside the heating chamber 2 rises. The temperature in 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 Do cooking.

In the present embodiment, the hot air supplied from the hot air outlet 34 into the heating chamber 2 has a flow directed substantially forward of the heating chamber 2. Therefore, even when the square plate 22 or the food 20 is disposed, 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 around the square plate 22 By flowing to the hot air suction port 35 at the rear of the heating chamber 2 and being sucked into the hot air circulation unit 3 again, a circulation air passage is formed between the heating chamber 2 and the hot air circulation unit 3. 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 from the hot air outlet 34 substantially forward, as shown in FIGS. 7 and 8, the square plate is disposed at the upper and lower stages, and as shown in FIG. 9 and FIG. The hot air flows in the same manner, regardless of the arrangement in the lower stage. Therefore, regardless of the arrangement of the food or the square plate, it is possible to perform heating and cooking with suppressed heating unevenness.
[Features and effects of configuration]
When hot air is supplied toward the wall, heat exchange is performed between the hot air and the wall to heat the wall, and the wall temperature may become extremely high compared to the air temperature in the heating chamber and the food temperature. The temperature of the food in the vicinity of the wall and in the other areas is different, which may cause uneven heating. In addition, when the wall surface becomes extremely hot, parts such as sensors and substrates installed around the wall may become hot and cooling may be difficult. In addition, when the flow path is created by providing a partition in the middle of the flow path, the flow path becomes complicated, air path resistance and loss increase, air volume decreases, and the air temperature difference around the food increases and heating is performed. The unevenness sometimes got worse. Also, 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 the food 20 when the food 20 is a food such as cookies having a low height. Flows over the food 20.

  However, as shown in the present embodiment, when the food 20 is a food such as bread having a high height, the hot air hits the food 20, so only the part hit with the hot air becomes hot, and conversely, the heating chamber 2 Since the hot air does not flow forward of the temperature, the temperature does not rise, and a temperature distribution may occur before and after the heating chamber 2. That is, the flow path of the air inside the heating chamber 2 changes depending on the height of the food 20, and the temperature distribution is different, which causes uneven heating.

  In the present embodiment, the hot air fan 30 is a fan that generates an air flow also in the rotational axis direction, and the shape of the hot air circulation unit cover 33 provided with the convex surface of the cover enables the hot air backward from the hot air fan 30 inside the hot air circulation unit 3 Hot air is supplied to the heating chamber 2 from the hot air outlet 34 by passing around the heater 32. Therefore, since the hot air supplied to the heating chamber 2 flows not in the direction of the wall surface nor in the center direction of the heating chamber but toward the front of the heating chamber 2, it is possible to perform uniform heating and cooking. Since heat exchange due to the hot air directed to the wall surface can be suppressed, the wall surface does not become high temperature more than necessary, and cooling of parts is facilitated and the amount of heat radiation is suppressed, and air can be efficiently heated is there. In addition, since the loss of the flow passage inside the hot air circulation unit 3 is low and the hot air can be appropriately flowed to the rear of the hot air heater 32, heat exchange between the air and the hot air heater 32 is promoted to efficiently heat the air. Can. 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 hard to be affected even when the square plate 22 or the food 20 is placed or when the height of the food 20 changes, and the structure is such that hot air can reach the front of the heating chamber 2. Even if it is easy to control heating unevenness. Further, since the hot air flows substantially forward, it is possible to suppress the heating of not only the upper and lower wall surfaces but also the left and right wall surfaces.

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

  In the present embodiment, the shape and the number of the hot air heaters 32 are not limited. However, in the present embodiment, since the hot air heaters 32 are respectively installed two on each of the upper and lower sides of the hot air fan 30, each heater is independent. Can be driven. For example, only the lower hot air heater 32 can be driven to perform cooking with the lower side of the square plate 22, i.e., a lower fire, intensified. Moreover, in order to quickly raise the temperature in the heating chamber 2, it is effective to increase the output of the hot air heater 32, and the power of the household power supply is specified as 1500 W. 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 simultaneously with other heat sources. In the present embodiment, since the two hot air heaters 32 can be independently driven, it is possible to simultaneously drive and cook the hot air heater 32 on one side and, for example, the upper surface heater 24 in combination.

  Further, as shown in FIG. 5, the shape of the hot air circulation unit cover 33 in the present embodiment is provided with a flange-like flat surface located rearward of the cover flat surface 33A in the vicinity of the center of the cover flat surface 33A. 31 is fixed. As described above, as long as the hot air circulation unit cover 33 includes the cover flat surface 33A and the cover back surface 33B, which are at least the convex surface of the cover, the hot air circulation unit cover 33 may have other surfaces.

  The structure of the second embodiment of the present invention will be described with reference to FIGS. 12 and 13. FIG. FIG. 12 is a perspective view of the hot-air circulation unit of the heating cooker of the second embodiment as viewed from the front upper side. FIG. 13 is a schematic view of the hot air circulation unit as viewed from the side. The heating cooker of the present embodiment is the same as the structure described in the first embodiment except for the hot air circulation unit 3, and the description of the same structure as the first embodiment will be omitted.

  In the present embodiment, of the hot air circulation unit cover 33, the shape of the cover convex surface 33C is different from that of the first embodiment. Specifically, in the first embodiment, the cover flat surface 33A is substantially square, but in the second embodiment, the stop 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 a curved surface. It is a configured shape.

  Since the shape of the cover convex surface 33C is different from that of the first embodiment, the air flow direction 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. Similarly to the above, the effect of supplying the 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 closer to the heating chamber 2 than the cover back surface 33B.

  Moreover, the effect of increasing the circulation air volume of the hot air is that the air passage resistance in the hot air circulation unit 3 is reduced by the deep drawing depth of the cover back surface 33B and the long distance between the cover convex surface 33C and the cover back surface 33B. can get.

  As described above, in the present embodiment, a cover convex surface 33C on the heating chamber 2 side and a cover back surface 33B on the rear thereof are provided, air flows in the axial direction of the hot air fan 30, and an air path is provided on the rear of 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 appropriately flows through the hot air heater 32 and the hot air is supplied substantially forward of the heating chamber 2.

  The structure of the third embodiment of the present invention will be described with reference to FIG. FIG. 14: is the perspective view which looked at the hot-air circulation unit of the heating cooker of Example 3 from the front upper direction. The heating cooker of the present embodiment is the same as the structure described in the first embodiment except for the hot air circulation unit 3, and the description of the same structure as the first embodiment will be omitted.

  In the present embodiment, in the hot air circulation unit 3, the shape of the hot air heater 32 and the shape of the cover plane 33A are different from those in the first embodiment. Specifically, in the first embodiment, the hot air heaters 32 are substantially linear heaters, and two hot air heaters 32 are disposed above and below the hot air heaters 32. However, the hot air heaters 32 of the third embodiment have one substantially circular heater. It is. Moreover, although the cover plane 33A of Example 1 is a substantially square shape, in Example 3, the cover plane 33A is a substantially circle shape.

  Since the cover flat surface 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 strikes the hot air heater 32, and heat exchange can be efficiently performed in the entire hot air heater 32. .

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

1: Main unit,
10: Cabinet,
11: Door,
2: heating chamber,
20: Food,
21: Shelf,
22: Square plate,
23: Table plate,
24: Top heater,
3: Hot air circulation unit,
3A: Channel,
30: Hot air fan,
30A: Hot-air fan wing,
30Aa: Wing inclination angle,
30B: Channel between wings,
30C: Hub face,
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: Cover back,
33C: Cover convex,
33D: Cover slope,
33E: Hot air guide surface,
33AL: Outer diameter of cover plane,
33DL: Outer diameter dimension of cover slope,
34: Hot air outlet,
35: Hot air inlet,
36: Wind direction plate,
4: Machine room,
40: Magnetron,
41: Waveguide,
42: Rotating antenna,
43: Antenna motor

Claims (6)

A heating cooker comprising a heating chamber for storing food, and a hot air circulation unit provided behind a rear wall surface of the heating chamber,
The hot air circulation unit is
Hot air heater for heating the air,
A hot air fan circulating air in the heating chamber;
A hot air motor for driving the hot air fan;
A hot air circulation unit cover in which the hot air heater and the hot air fan are disposed on the heating chamber side, and the hot air motor is disposed on the rear side of the main body;
The hot air circulation unit cover is
A cover convex surface provided substantially at the center and surrounding a rotational shaft connecting the hot air fan and the hot air motor;
A cover inclined surface that surrounds the cover convex surface and is inclined rearward from the cover convex surface;
A cover back surface surrounding the cover inclined surface and located rearward of the cover convex surface;
A hot air guide surface which surrounds the back of the cover and guides the hot air forward;
And have
The outer diameter of the cover convex surface is smaller than the outer diameter of the hot air fan, and
The heating cooker according to claim 1, wherein the convex cover surface protrudes by 10 mm or more, or 1/3 or more of the height of the hot air guide surface, toward the hot air fan side with respect to the rear surface of the cover. A heating cooker comprising a heating chamber for storing food, and a hot air circulation unit provided behind a rear wall surface of the heating chamber,
The hot air circulation unit is
Hot air heater for heating the air,
A hot air fan circulating air in the heating chamber;
A hot air motor for driving the hot air fan;
A hot air circulation unit cover in which the hot air heater and the hot air fan are disposed on the heating chamber side, and the hot air motor is disposed on the rear side of the main body;
The hot air circulation unit cover is
A cover convex surface provided substantially at the center and surrounding a rotational shaft connecting the hot air fan and the hot air motor;
A cover inclined surface that surrounds the cover convex surface and is inclined rearward from the cover convex surface;
A cover back surface surrounding the cover inclined surface and located rearward of the cover convex surface;
A hot air guide surface which surrounds the back of the cover and guides the hot air forward;
And have
The inner diameter of the cover inclined surface is smaller than the outer diameter of the hot air fan,
The outer diameter of the said cover inclined surface is larger than the outer diameter of the said hot-air fan, The heating cooker characterized by the above-mentioned.   The heating cooker according to claim 1 or 2, wherein the hot-air fan has a blade inclination angle of 90 degrees or more with a blade and a hub surface integrally formed with the blade.   The heating cooker according to any one of claims 1 to 3, wherein an outer diameter of the hot air motor when the hot air circulation unit is viewed from the front surface is smaller than an outer diameter of the cover convex surface.   5. The hot air blower outlet arranged substantially horizontally on the rear wall surface of the heating chamber is disposed 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 of the preceding claims.   The heating cooker according to any one of claims 1 to 5, wherein the cover convex surface is a flat surface or a curved surface.

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