JPH08247473A - Heating cooker - Google Patents

Abstract

PURPOSE: To enable heating cooking which is free from unevenness of heating by effectively and smoothly supplying air into a heating cooking chamber by a fan. CONSTITUTION: A back plate 16 is provided with a depression 22 and a front plate 23 is disposed in an opposing relationship with the back plate 16. A fan chamber 24 is formed by a space defined between a plate face of the front plate 23 and a bottom face 22a of the depression 22, and an exhausting port 25 is formed by a space defined between a fringe portion 23c and an opening fringe portion 22b of the depression 22. The front plate 23 is provided with an inlet port 26 at a central portion. A fan 27 and a heater 28 are installed in the fan chamber 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating cooker having an oven cooking function.

[0002]

2. Description of the Related Art Conventionally, as a heating cooker of this type, there is one having a structure shown in FIGS. That is, the main body 1 is composed of an outer box 2 and an inner box 3, and the inside of the inner box 3 is a cooking chamber 4. A back plate 5 is attached to the back side of the back plate portion 4a of the heating and cooking chamber 4, and a fan chamber 6 is formed between the back plate portion 4a and the back plate 5.

When a suction port 7 having a large number of small holes is formed in the central portion of the back plate 4a, discharge ports 8a and 8b having a large number of small holes are formed in the upper and lower portions, respectively. There is. A fan 9 is provided inside the fan chamber 6, and a heater 10 is provided at the outer periphery of the fan 9.

However, when cooking in the oven, the fan 9 is used.
Is driven to rotate by the motor 9a, and the heater 10
Is energized to generate heat. Due to the blowing action of the fan 9, the air in the heating cooking chamber 4 is sucked into the fan chamber 6 from the suction port 7 and is discharged into the heating cooking chamber 4 from the discharge ports 8a and 8b. In this case, the air (wind) discharged into the heating cooking chamber 4 is heated by the heater 10 and turned into hot air. The hot air passes through the heating cooking chamber 4 and is sucked again from the suction port 7, and the food to be heated in the heating cooking chamber 4 is cooked by such circulation.

[0005]

By the way, the above conventional structure has the following problems. That is, as shown in FIG. 11, when the fan 9 rotates, the wind generated by this rotates the inner wall surface 6 of the fan chamber 6 as indicated by the arrow in the figure.
It flows along a, but is discharged through the discharge port 8a after hitting the end portion 4b of the back plate portion 4a,
As a result, a turbulent flow of wind is generated at this discharge port 8a, the efficiency of blowing air forward is poor, and heating of the cooked food is generally non-uniform. Further, since the discharge port 8a is formed of a small hole, it becomes a resistance against the blowing of the wind, and the blowing efficiency is further deteriorated. In order to deal with these problems, a powerful motor is required as the motor 9a for driving the fan 9, which causes a problem of high cost.

The present invention has been made in view of the above circumstances, and an object of the present invention is to allow the air from a fan to be efficiently and smoothly supplied into a heating / cooking chamber so that heating in an oven can be evenly heated and the fan can be driven. There is a need for a heating cooker that can contribute to cost reduction without requiring a very powerful motor.

[0007]

A first means is a main body having a heating and cooking chamber, a recess formed in a back plate of the heating and cooking chamber so as to open toward the inside of the heating and cooking chamber, and the spine. The plate surface is provided on the plate portion so as to face the back wall of the recess and at least a part of the end edge portion thereof is separated from the open edge portion of the recess, and between the plate surface and the back wall of the recess portion. A front plate that forms a fan chamber, forms a discharge port between the end edge and the open edge of the recess, and has a suction port in the center, and the air in the cooking chamber that is disposed in the fan chamber. A fan for oven cooking that sucks in from the suction port and discharges from the discharge port,
A heater for oven cooking that heats the wind generated by the fan is included (the invention of claim 1).

A second means is a main body having a heating and cooking chamber, a recess formed in the back plate of the heating and cooking chamber so as to open toward the inside of the heating and cooking chamber, and a plate surface on the back plate. Is provided so as to face the back wall of the recess and at least a part of the end edge is separated from the open edge of the recess to form a fan chamber between the plate surface and the back wall of the recess. , A front plate having a discharge port formed between the end edge and the open edge of the recess and having a suction port in the center, and the air in the cooking chamber provided in the fan chamber is sucked from the suction port A fan for oven cooking that is discharged from the discharge port, and a heater for oven cooking that heats the air generated by the fan;
A microwave oven for supplying microwaves to the heating cooking chamber is provided, and the width dimensions of the discharge port and the suction port are set to the width dimensions through which microwaves pass, and the fan is rotated during range cooking. This is the case (the invention of claim 2).

A third means is a main body having a heating and cooking chamber, a recess formed in the back plate of the heating and cooking chamber so as to open toward the inside of the heating and cooking chamber, and a plate surface on the back plate. Is provided so as to face the back wall of the recess and at least a part of the end edge is separated from the open edge of the recess to form a fan chamber between the plate surface and the back wall of the recess. , A front plate having a discharge port formed between the end edge and the open edge of the recess and having a suction port in the center, and the air in the cooking chamber provided in the fan chamber is sucked from the suction port A fan for oven cooking that is discharged from the discharge port, and a heater for oven cooking that heats the air generated by the fan;
A microwave oven magnetron for supplying microwaves to the heating and cooking chamber is provided, the front plate is made of a microwave transparent material, and the fan is rotated during microwave cooking. Invention of Item 3).

A fourth means is a main body having a heating and cooking chamber, a recess formed in the back plate of the heating and cooking chamber so as to open toward the inside of the heating and cooking chamber, and a plate surface on the back plate. Is provided so as to face the back wall of the recess and at least a part of the end edge is separated from the open edge of the recess to form a fan chamber between the plate surface and the back wall of the recess. , A front plate having a discharge port formed between the end edge and the open edge of the recess and having a suction port in the center, and the air in the cooking chamber provided in the fan chamber is sucked from the suction port Generated by the fan, a fan for oven cooking that discharges from the discharge port, a motor that is provided on the back side of the back wall of the recess and that rotates the fan through a shaft through hole formed in the back wall of the recess, A heater for oven cooking that heats the wind,
It is configured to include a magnetron for microwave cooking for supplying microwaves to the heating cooking chamber, and a choke portion provided at a peripheral portion of the shaft through hole (the invention of claim 4).

A fifth means is a main body having a heating and cooking chamber, a recess formed in the back plate of the heating and cooking chamber so as to open toward the inside of the heating and cooking chamber, and a plate surface on the back plate. Is provided so as to face the back wall of the recess and at least a part of the end edge is separated from the open edge of the recess to form a fan chamber between the plate surface and the back wall of the recess. , A front plate having a discharge port formed between the end edge and the open edge of the recess and having a suction port in the center, and the air in the cooking chamber provided in the fan chamber is sucked from the suction port A fan for oven cooking that discharges from the discharge port, and a motor that is provided on the back side of the inner wall of the recess for rotating the fan;
A heater for oven cooking that heats the wind generated by the fan, a magnetron for range cooking that supplies microwaves into the cooking chamber, a rotary shaft of the motor, and the fan are electrically connected to each other. And a connecting member made of a heat-resistant electric insulating material (the invention of claim 5).

The sixth means is provided inside the main body, and is formed in a heating cooking chamber formed by joining plate materials and a back plate portion of the heating cooking chamber so as to open toward the inside of the heating cooking chamber. And the back plate, the plate surface is provided so as to face the back wall of the recess and at least a part of the end edge is separated from the open edge of the recess. A fan chamber is formed between the inner wall and the back wall, a discharge port is formed between the end edge portion and the open edge portion of the recess, and a front plate having a suction port in the central portion is disposed in the fan chamber. A fan for oven cooking that sucks the air in the heated cooking chamber from the suction port and discharges it from the discharge port, a heater for oven cooking that heats the air generated by the fan, and a microwave in the heating cooking chamber. And a magnetron for cooking a microwave oven, Is made of the distance between the engaging portion be less than a quarter of the wavelength λ of the microwave (the invention of claim 6).

The seventh means is characterized in that, in any one of the first to sixth means, the blade of the fan forms an acute bending angle toward the fan rotation direction side with respect to the inner wall of the recess ( Invention of claim 7). The eighth means is the first
In any one of the sixth to sixth means, the width dimension of the suction port and the discharge port in the short direction is set to 5 to 10 mm, respectively (invention of claim 8). The ninth means is characterized in that, in any one of the first to sixth means, the radial width dimension of the discharge port is set to be smaller in the rotation direction of the fan (the invention of claim 9). ).

The tenth means is characterized in that, in any one of the first to sixth means, the ridges are radially formed on the back surface of the front plate (claim 10). invention). An eleventh means is the food cooking plate according to any one of the first to sixth means, wherein the food placing plates are detachably provided in upper and lower two stages in the heating and cooking chamber, and the discharge port is provided from the upper food placing plate. The hot air generated by the fan and the heater provided in the upper portion and the lower portion below the food placing plate, respectively, is discharged from the upper discharge port and the lower discharge port during cooking in the oven, and both food placing plates are placed. It is characterized in that it is configured so as to flow through the space to the suction port (the invention of claim 11).

A twelfth means is characterized in that, in any one of the second to sixth means, a front surface of the front plate and an inner surface of the recess are coated with a stain prevention coating (the invention of claim 12). . A thirteenth means is characterized in that, in the second or third means, the number of rotations of the fan during range cooking is set to be lower than the number of rotations of the fan during oven cooking (claim 13).
Invention).

[0016]

In the first means, when the fan is rotated during cooking in the oven, wind is generated, which is heated by the heater and turned into hot air. This hot air flows along the peripheral wall surface of the recess, and is discharged from the discharge port into the cooking chamber. In this case, the discharge port is formed by the gap between the open edge of the recess formed in the back plate and the end edge of the front plate. There is no portion projecting inward, and as a result, the hot air flowing along the peripheral wall surface of the recess is smoothly discharged as it is from the discharge port into the cooking chamber. As a result, oven cooking can be performed without uneven heating, and a motor for driving the fan does not need to be very powerful.

In addition to the same operation as the first means, the second means enables range cooking with a magnetron. Further, in this case, the width of the discharge port and the size of the suction port are set to the widths through which the microwaves pass, and the fan is rotated even during this range cooking. The microwave can be diffused by the fan that can move in and out and that rotates in the fan chamber. As a result, range cooking can be performed without heating unevenness, and since a fan for oven cooking is used, a dedicated fan for microwave diffusion is not required.

In the third means, in addition to the same effect as the first means, the range cooking by the magnetron is possible. Further, in this case, since the front plate is made of a microwave transmitting material and the fan is rotated even during this range cooking, the microwaves can enter and exit the fan chamber, and at the same time, in the fan chamber. Microwaves are diffused by the rotating fan. As a result, range cooking can be performed without heating unevenness, and since a fan for oven cooking is used,
Does not require a dedicated fan for microwave spreading.

In the fourth means, in addition to the same operation as the first means, the range cooking by the magnetron is possible. Furthermore, during microwave cooking, there is a concern that microwaves may leak toward the motor that drives the fan. However, in the fourth means, the microwave is leaked to the peripheral portion of the shaft through hole formed in the inner wall of the recess. Since the choke portion is provided, microwave leakage can be prevented.

In the fifth means, in addition to the same effect as the first means, range cooking with a magnetron is possible. Furthermore, during microwave cooking, there is concern that microwaves may leak from the connecting portion between the fan and the rotation shaft of the motor that drives the fan.
In this means, since the rotating shaft of the motor and the fan are electrically connected by the connecting member made of a heat-resistant electric insulating material, microwave leakage can be prevented.

In the sixth means, in addition to the same operation as the first means, the range cooking by the magnetron is possible. Further, during microwave cooking, there is a concern that microwaves may leak from the joints of the plate materials forming the heating cooking chamber. In the sixth means, the gap between the joints of the plate materials is set to the microwave wavelength λ. 1/4 of
Since it is less than, it is possible to prevent microwave leakage.

In the seventh means, the blade of the fan is constructed so as to form an acute bending angle toward the fan rotation direction side with respect to the inner wall of the recess, so that the wind is pressed against the inner wall while being pushed against the inner wall. Since the air flows along the wall, the air is efficiently pushed to the outside, and as a result, the blowing efficiency is improved, which also eliminates the need to make the fan driving motor very powerful. In the eighth means, since the width dimensions of the suction port and the discharge port in the short direction are each set to 5 to 10 mm, fingers cannot enter the fan chamber. In the ninth means, since the radial width of the discharge port is set to be small in the rotation direction of the fan, it becomes possible to discharge a substantially uniform amount of air from the entire region of the discharge port, and the heating is performed. It can contribute to the prevention of unevenness.

In the tenth means, since the ridges are radially formed on the back surface of the front plate, it is possible to discharge a substantially uniform amount of air from the entire area of the discharge port, which contributes to preventing uneven heating. It is possible. In the eleventh means, the hot air generated by the fan and the heater during cooking in the oven passes all over and under the both food placing plates, so that uneven heating can be further prevented.

In the twelfth means, the front and rear surfaces of the front plate and the inner surface of the recess are coated with a stain prevention coating, so that it is possible to prevent oil stains from adhering to the front and rear surfaces of the front plate and the inner surface of the recess. In particular, during the range cooking with the magnetron, the oil stain is not carbonized, and the spark is not generated. In the thirteenth means, the number of rotations of the fan during range cooking is set to be lower than the number of rotations of the fan during oven cooking, which can contribute to a reduction in power cost.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. First, FIG. 3 and FIG.
As shown in FIG. 1, the main body 11 has an inner box 13 inside an outer box 12.
The inner box 13 is formed by joining a main plate 14 as a plate material, an upper plate portion 15 and a back plate portion 16 by spot welding, for example. In this case, the distance between the joints is less than 1/4 of the microwave (3
(Less than 0.5 mm). The inside of the inner box 13 is a heating and cooking chamber 17.

As shown in FIG. 4, receiving portions 18 are formed in upper and lower two stages on the left and right side plate portions of the main plate 14 of the inner box 13, and the receiving portions 18 have a top plate serving as a food placing plate. 19, 1
9 is detachably supported and arranged in the heating and cooking chamber 17. A lower heater 20 and an upper heater 21 used for grill cooking or toast cooking are provided on the lower surface of the bottom plate and the upper plate 15 of the main plate 14.

A recess 22 is formed in the back plate portion 16. The recess 22 has a substantially circular shape when viewed from the front and opens toward the inside of the heating and cooking chamber 17, and in particular, the inner peripheral surface has a shape that temporarily expands. And
A front plate 23 made of a metal plate is attached to the back plate portion 16.

The front plate 23 has a substantially circular main plate portion 23a.
The mounting plate portions 23b, 23b are extended to the left and right portions of the main plate portion 23a, and the plate surface of the main plate portion 23a is the back wall 2 of the recess 22.
2a and the edge 23c is the open edge 2 of the recess 22.
2b so as to be separated from the mounting piece 23b, 2
3b is spot-welded to the back plate portion 16, for example. Then, the plate surface of the main plate portion 23a and the inner surface 22a of the recess 22 are formed.
The fan chamber 24 is formed by the space between the two, and the discharge port 25 is formed by the space between the end edge 23c and the open edge 22b of the recess 22. The discharge ports 25 are formed in the upper and lower sides, and are respectively located at the upper part of the upper top plate 18 and the lower part of the lower top plate 18. In addition, the front plate 23 has a plurality of vertically elongated slits 2 at the center thereof.
A suction port 26 composed of 6a is formed.

As shown in FIG. 2, in this case, the width dimension of the discharge port 25, in this case, the linear dimension He in the longitudinal direction is not less than ¼ of the wavelength λ of the microwave, and the slit 26 a of the suction port 26 is formed. Width dimension In this case, the width dimension Hs in the longitudinal direction is also ¼ or more of the wavelength λ of the microwave, that is, the width dimension of the discharge port 25 and the suction port 26 is set to the width dimension through which the microwave passes. ing. In addition, the width dimensions he and hs (see FIG. 2) of the discharge port 25 and the suction port 26 in the short direction are set to 5 to 10 mm.

Further, the front and rear surfaces of the front plate 23 and the inner surface of the recess 22 are coated with a stain preventing coating such as a fluorine treatment. The fan chamber 24 is provided with a fan 27 for oven cooking, and a heater 28 for oven cooking is provided on the outer periphery of the fan 27. The fan 27 is driven to rotate by a motor 29. A shaft connecting portion of the fan 27 will be described. A support plate 30 is attached to the back surface of the back plate portion 16. The tool 31 is attached. The motor 29 is attached to the motor mount 31.
Is attached to the rotary shaft 29a of the motor 29.
An air cooling fan 32 is attached to this.

Further, the rotary shaft 29a and the fan 27
And are electrically connected by a connecting member 33 made of a heat-resistant electric insulating material such as ceramic. The connecting member 33 penetrates shaft through holes 16a and 30a formed in the back plate portion 16 and the support plate 30, respectively. A choke portion 34 is formed on the peripheral portion of the shaft through hole 16a.
The circular shield plate 35 that constitutes the above is attached.

The fan 27 has, for example, eight blades 36. The blades 36 rotate in the direction of rotation of the fan 27 with respect to the inner wall 22a of the recess 22 as shown in FIG. The bending angle θ toward the side (indicated by arrow A) is formed to be an acute bending angle. Further, as shown in FIG. 4, a magnetron 37 for microwave cooking and a waveguide 38 are attached to the side plate portion of the inner box 13.

Although not shown, the main body 11 is provided with an operation panel. The operation panel has a switch for selecting oven cooking, range cooking, grill cooking and toast cooking, a time setting switch, and a temperature setting switch. A setting switch, a start switch, and the like are provided. Further, the main body 11 is provided with a control circuit including a microcomputer and various drive circuits.

In the above structure, when oven cooking (not shown) is selected and cooking is started, the control circuit energizes the motor 29 and the heater 28. The fan 29 is rotated in the direction of arrow A by the motor 29, so that the air in the cooking chamber 17 is sucked into the suction port 26.
Is sucked into the fan chamber 24 from the
The air inside is discharged from the upper and lower discharge ports 25 into the cooking chamber 17. In this case, the discharged air is heated by the heater 28 and becomes hot air. The air discharged from the upper discharge port 25, that is, hot air, passes above the top plate 18 of the upper part to the front side, and the hot air discharged from the discharge port 25 of the lower part passes to the front side below the lower plate 18 of the lower part. And cooking room 1
In the front part of 7, the direction is changed between the top plates 18 and 18 and the space between these top plates 18 and 18 is passed through the suction port 26 to the fan chamber 24 again.
Inhaled. By circulating the hot air in this manner, the food placed on the top plate 18 is heated and cooked.

By the way, when the hot air is discharged from the discharge port 25 into the cooking chamber 17, the discharge port 25 has the open edge 22b of the recess 22 formed in the back plate portion 16 and the front plate 23.
Since it is formed by a gap with the edge 23c of
At the discharge port 25 portion, the open edge portion 22b of the concave portion 22
Since there is no portion projecting inward from the inside, as a result, the hot air flowing along the peripheral wall surface 22c (see FIG. 1) of the recess 22 is smoothly discharged from the discharge port 25 into the cooking chamber 17 as it is. . As a result, the oven cooking can be performed without heating unevenness, and the motor 29 for driving the fan 27 does not need to be so powerful.

On the other hand, instead of the top plates 19 and 19, a placing dish (not shown) for range cooking is appropriately arranged in the heating and cooking chamber 17, and range cooking is selected and cooking is started. Then, the control circuit drives the magnetron 37 and energizes the motor 29. In this case, the rotation speed of the motor 29 is controlled to be lower than that in the case of cooking in the oven, so that the rotation speed of the fan 27 is also reduced.

The magnetron 37 supplies microwaves to the cooking chamber 17 through the waveguide 38. In this case, the microwaves can enter and leave the fan chamber 24 through the discharge port 25 and the suction port 26, and the fan 27 is rotated in the fan chamber 24, so that the microwaves can be well diffused. become.

According to this embodiment, hot air is generated by the fan 27 and the heater 28 and discharged from the discharge port 25 during cooking in the oven.
Is an open edge portion 22b of the recess 22 formed in the back plate portion 16.
Since there is a gap between the front edge of the front plate 23 and the edge 23c of the front plate 23, there is no portion of the discharge port 25 projecting inward from the open edge 22b of the recess 22.
The hot air is smoothly discharged from the discharge port 25 into the cooking chamber 17 along the peripheral wall surface 22c of the recess 22. As a result, the oven cooking can be performed without heating unevenness, and the motor 29 for driving the fan 27 does not need to be so powerful.

Further, since the width dimensions He and Hs of the discharge port 25 and the suction port 26 are set to the width dimensions through which microwaves pass, and the fan 27 is also rotated during this range cooking, Is the fan room 24
The microwave can be diffused by the fan 27 rotating in the fan chamber 24 as a result of which the microwave can be diffused, and as a result, range cooking can be performed without uneven heating, and the fan 27 for oven cooking can be used. Therefore, a dedicated fan for microwave diffusion (a stirrer fan) is not required.

Here, at the time of range cooking, the fan 2 is used.
There is a concern that microwaves may leak from the 7 side toward the motor 29, but according to the present embodiment, the back wall 2 of the recess 22 is formed.
Since the choke portion 34 is provided in the peripheral portion of the shaft through hole 16a in 2a, microwave leakage can be prevented.

Further, although there is a concern that microwaves may leak from the connecting portion between the fan 27 and the rotating shaft 29a of the motor 29 that drives the fan 27, according to the present embodiment, the rotating shaft 29a of the motor 29 and the rotating shaft 29a of the motor 29 may be leaked. Since the fan 27 is electrically connected to the fan 27 by the connecting member 33 made of a heat-resistant electric insulating material, it is possible to prevent microwave leakage. Furthermore, according to the present embodiment, since the interval between the joints of the plate materials forming the heating and cooking chamber 17 is less than 1/4 of the wavelength λ of the microwave, it is possible to prevent microwave leakage from the joints. Is.

Further, according to the present embodiment, the blade 36 of the fan 27 is arranged so that the blade 2 of the fan 2 with respect to the inner wall 22a of the concave portion 22 is removed.
Since it is configured to form an acute bending angle toward the 7-rotation direction side, the wind can be efficiently pushed to the outside, and as a result, the blowing efficiency is improved, which also enables the motor 29 for driving the fan 27. You don't have to be very powerful.

In particular, according to this embodiment, the widths hs and he of the suction port 26 and the discharge port 25 in the short-side direction are set to 5 to 10 mm, respectively, so that fingers cannot enter the fan chamber 24. . Furthermore, the hot air generated by the fan 27 and the heater 28 during cooking in the oven is discharged from the upper discharge port 25 and the lower discharge port 25, respectively, and passes above and below both top plates 19, 19, and then both top plates. 1
Since it was made to flow through the space between 9 and 19 to the suction port 26, the hot air flowed evenly between the top and bottom of each top plate 19, 19,
Therefore, uneven heating can be further prevented.

Further, according to this embodiment, since the front and rear surfaces of the front plate 23 and the inner surface of the concave portion 22 are coated with the stain prevention coating, oil stains are prevented from adhering to the front and rear surfaces of the front plate 23 and the inner surface of the concave portion 22. This makes it possible to prevent the oil stains from being carbonized and no spark is generated, especially when the range is cooked by the magnetron 37. Furthermore, since the rotation speed of the fan 27 during range cooking is set to be lower than the rotation speed of the fan 27 during oven cooking, it is possible to contribute to a reduction in power cost.

Next, FIG. 6 shows a second embodiment of the present invention. This embodiment differs from the first embodiment in the following points. That is, the width of the discharge port 41 in the radial direction is set to be smaller in the rotation direction of the fan 27 (direction of arrow A). In the figure, the width dimension B and the width dimension C are shown, and the width dimension B is large. According to the second embodiment, it becomes possible to discharge a substantially uniform amount of air from the entire area of the discharge port 41, which contributes to preventing uneven heating. That is, if the radial width of the discharge port is uniform in the rotation direction of the fan, the amount of air blown is large at the tip of the discharge port in the rotational direction, and the amount of air blown at the base of the discharge port in the rotational direction. Less, but this second
This is not the case in the embodiment.

Further, FIGS. 7 and 8 show the third embodiment of the present invention.
This embodiment is different from the first embodiment in the following points. That is, the protrusions 42 are radially formed on the back surface of the front plate 23. According to this embodiment, the ridge portion 4
2 can be expected to have a rectifying effect on the wind, and as a result, it becomes possible to discharge a substantially uniform amount of air from the entire area of the discharge port 25, which contributes to preventing uneven heating.

The present invention is not limited to the above embodiments, but may be modified as follows. For example, instead of the front plate 23 made of a metal plate of the first embodiment, a front plate made of a microwave transmitting material, for example, a mica plate may be used. In this case, the microwave is transmitted to the fan chamber. The microwave can be diffused by the fan rotating in the fan chamber as well as entering and exiting.

[0048]

As is apparent from the above description, the present invention can obtain the following effects. According to the invention of claim 1, the hot air generated in the fan chamber can be smoothly discharged into the heating cooking chamber along the peripheral wall surface of the recess as it is, and as a result, it is possible to uniformly heat the oven cooking, Moreover, it does not require a very powerful motor for driving the fan, which contributes to cost reduction.

According to the invention of claim 2, in addition to the same effect as the invention of claim 1, in addition to the oven cooking,
Range cooking by magnetron is possible, and further,
In this case, the width of the discharge port and the size of the suction port are set to the widths through which the microwaves pass, and the fan is rotated even during this range cooking, so that the microwaves can be sufficiently diffused. As the range cooking can be performed without heating unevenness, and the fan for oven cooking is used, a dedicated fan for microwave diffusion is not required, which can contribute to cost reduction.

According to the invention of claim 3, in addition to the same effect as that of the invention of claim 1, range cooking with a magnetron is possible, and in this case, the front plate is made of a microwave transmitting material. Moreover, since the fan is rotated even during this range cooking, the microwave can be sufficiently diffused, and as a result, the range cooking can be evenly heated and the fan for oven cooking is used. As a result, a dedicated fan for microwave diffusion is not required, which contributes to cost reduction.

According to the invention of claim 4, in addition to the same effect as that of the invention of claim 1, range cooking by a magnetron is possible, and further, the peripheral portion of the shaft through hole formed in the inner wall of the recess is formed. Since there is a choke part on the
Microwave leak can be prevented.

According to the invention of claim 5, in addition to the same effect as that of the invention of claim 1, range cooking by a magnetron is possible, and furthermore, the rotating shaft of the motor and the fan are electrically insulated with heat resistance. Since the members are connected in an electrically insulated state by a connecting member made of a material, microwave leakage can be prevented.

According to the invention of claim 6, in addition to the same effect as that of the invention of claim 1, range cooking with a magnetron is possible, and the distance between the joints of the plate members is set to the microwave wavelength λ. Since it is less than ¼, it is possible to prevent microwave leakage.

According to the invention of claim 7, since the blade of the fan is configured to form an acute bending angle toward the fan rotation direction side with respect to the inner wall of the recess, the blowing efficiency is improved. This also eliminates the need to make the fan drive motor very powerful. According to the eighth aspect of the invention, since the width dimensions of the suction port and the discharge port in the short direction are each set to 5 to 10 mm, fingers cannot enter the fan chamber. According to the invention of claim 9, since the width of the discharge port in the radial direction is set to be smaller in the rotation direction of the fan, it is possible to discharge a substantially uniform amount of air from the entire region of the discharge port. In addition, it can contribute to the prevention of uneven heating.

According to the tenth aspect of the present invention, since the ridges are radially formed on the back surface of the front plate, it is possible to discharge a substantially uniform amount of air from the entire area of the discharge port, which contributes to preventing uneven heating. It is a thing. According to the eleventh aspect of the present invention, during the oven cooking, the hot air passes through the upper and lower portions of both food placing plates all over, so that uneven heating can be further prevented.

According to the twelfth aspect of the invention, since the front and rear surfaces of the front plate and the inner surface of the recess are coated with the stain prevention coating, it is possible to prevent oil stains from adhering to the front and rear surfaces of the front plate and the inner surface of the recess. In particular, when the range is cooked with a magnetron, oil stains do not carbonize,
No sparks will occur. According to the thirteenth aspect of the present invention, the number of rotations of the fan during range cooking is set to be lower than the number of rotations of the fan during oven cooking, which can contribute to a reduction in power cost.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view of essential parts showing a first embodiment of the present invention.

FIG. 2 is a front view of a front plate and a discharge port portion.

[Fig. 3] Overall vertical side view

FIG. 4 is an overall vertical sectional front view.

5 is a sectional view taken along the line QQ of FIG.

FIG. 6 is a view corresponding to FIG. 2 showing a second embodiment of the present invention.

FIG. 7 is a diagram corresponding to FIG. 1 showing a third embodiment of the present invention.

FIG. 8 is a view corresponding to FIG.

FIG. 9 is an overall vertical side view showing a conventional example.

FIG. 10 is an overall vertical front view.

FIG. 11 is a vertical sectional side view of a discharge port portion.

[Explanation of symbols]

Reference numeral 11 is a main body, 16 is a back plate portion, 17 is a cooking chamber, 19 is a top plate (food placing plate), 22 is a recessed portion, 22a is a back wall, 23
Is a front plate, 24 is a fan chamber, 25 is a discharge port, 26 is a suction port, 27 is a fan, 28 is a heater, 29 is a motor, 33
Is a connecting member, 34 is a choke part, 36 is a blade, 37
Indicates a magnetron.

Claims (13)

[Claims] 1. A main body having a heating and cooking chamber, a recess formed in the back plate of the heating and cooking chamber so as to open toward the inside of the heating and cooking chamber, and a plate surface of the back plate having the recess. It is provided so as to face the back wall and at least a part of the end edge portion thereof is separated from the open edge portion of the recessed portion to form a fan chamber between the plate surface and the back wall of the recessed portion, and the end edge portion. A front plate having a discharge port formed between the opening and the open edge of the recess and having a suction port at the center, and the discharge port for sucking air from the heating and cooking chamber in the fan chamber through the suction port. A heating cooker comprising a fan for oven cooking which is discharged from the heater, and a heater for oven cooking which heats wind generated by the fan. 2. A main body having a heating and cooking chamber, a recess formed in the back plate of the heating and cooking chamber so as to open toward the inside of the heating and cooking chamber, and a plate surface of the back plate having the recess. The fan chamber is provided so as to face the back wall and at least a part of the end edge portion thereof is separated from the open edge portion of the recessed portion to form a fan chamber between the plate surface and the back wall of the recessed portion, and the end edge portion. A front plate having a discharge port formed between the opening and the open edge of the recess and having a suction port at the center, and the discharge port for sucking air from the heating and cooking chamber in the fan chamber through the suction port. A fan for oven cooking that discharges from, a heater for oven cooking that heats the air generated by the fan, and a magnetron for range cooking that supplies microwaves into the heating cooking chamber, and the discharge port and Set the width of the suction port to the microwave A heating cooker that is set to a width dimension and that rotates the fan even during range cooking. 3. A body having a heating and cooking chamber, a recess formed in the back plate of the heating and cooking chamber so as to open toward the inside of the heating and cooking chamber, and a plate surface of the back plate having the recess. It is provided so as to face the back wall and at least a part of the end edge portion thereof is separated from the open edge portion of the recessed portion to form a fan chamber between the plate surface and the back wall of the recessed portion, and the end edge portion. A front plate having a discharge port formed between the opening and the open edge of the recess and having a suction port at the center, and the discharge port for sucking air from the cooking chamber in the fan chamber through the suction port. A fan for oven cooking that discharges from, a heater for oven cooking that heats the wind generated by the fan, and a magnetron for range cooking that supplies microwaves into the heating chamber, and the front plate The fan composed of a microwave transparent material A heating cooker that can be rotated even when cooking in a microwave oven. 4. A main body having a heating and cooking chamber, a recess formed in the back plate of the heating and cooking chamber so as to open toward the inside of the heating and cooking chamber, and a plate surface of the back plate having the recess. It is provided so as to face the back wall and at least a part of the end edge portion thereof is separated from the open edge portion of the recessed portion to form a fan chamber between the plate surface and the back wall of the recessed portion, and the end edge portion. A front plate having a discharge port formed between the opening and the open edge of the recess and having a suction port at the center, and the discharge port for sucking air from the heating and cooking chamber in the fan chamber through the suction port. A fan for cooking from the oven, a motor for rotating the fan through a shaft through hole formed on the back side of the back wall of the recess and formed in the back wall of the recess, and heating the wind generated by the fan. A heater for oven cooking and a microwave in the heating chamber. A heating cooker including a magnetron for cooking a microwave oven and a choke portion provided at a peripheral portion of the shaft through hole. 5. A body having a heating and cooking chamber, a recess formed in the back plate of the heating and cooking chamber so as to open toward the inside of the heating and cooking chamber, and a plate surface of the back plate having the recess. It is provided so as to face the back wall and at least a part of the end edge portion thereof is separated from the open edge portion of the recessed portion to form a fan chamber between the plate surface and the back wall of the recessed portion, and the end edge portion. A front plate having a discharge port formed between the opening and the open edge of the recess and having a suction port at the center, and the discharge port for sucking air from the heating and cooking chamber in the fan chamber through the suction port. A fan for oven cooking that discharges from the motor, a motor that is provided on the back side of the inner wall of the recess for rotating the fan, a heater for oven cooking that heats the wind generated by the fan, and the heating chamber For cooking microwave oven to supply microwave to And a connecting member made of a heat-resistant electric insulating material for connecting the rotating shaft of the motor and the fan in an electrically insulated state. 6. A heating and cooking chamber provided inside the main body and configured by joining plate materials, and a recess formed in a back plate portion of the heating and cooking chamber so as to open toward the inside of the heating and cooking chamber, The back plate portion is provided such that the plate surface faces the back wall of the recess and at least a part of the edge portion is separated from the open edge portion of the recess, and the plate surface and the back wall of the recess are formed. A front chamber having a fan chamber formed therebetween, a discharge port formed between the end edge portion and the open edge portion of the recess, and having a suction port in the central portion; and a heating cooking chamber disposed in the fan chamber. Fan for sucking the air of the suction port from the suction port and discharging the air from the discharge port, a heater for the oven cooking that heats the air generated by the fan, and a range for supplying microwaves to the heating cooking chamber A magnetron for cooking, between the joints of the plate materials ¼ of microwave wavelength λ
A heating cooker characterized by being less than. 7. The heating cooker according to claim 1, wherein the blade of the fan forms an acute bending angle with respect to the inner wall of the recess toward the fan rotation direction. 8. The heating cooker according to claim 1, wherein widths of the suction port and the discharge port in the short direction are set to 5 to 10 mm, respectively. 9. The heating cooker according to claim 1, wherein the width of the discharge port in the radial direction is set to be smaller in the rotation direction of the fan. 10. The heating cooker according to claim 1, wherein the front surface of the front plate has radial projections. 11. A food placing plate is detachably provided in upper and lower two stages in the heating and cooking chamber, and a discharge port is provided above the upper food placing plate and below the lower food placing plate. The hot air generated by the fan and heater during cooking in the oven is discharged from the upper discharge port and the lower discharge port, respectively, and flows between both food placing plates to the suction port. The heating cooker according to any one of claims 1 to 6. 12. The front and back surfaces of the front plate and the inner surface of the recess are coated with a stain prevention coating.
The heating cooker according to any one of 1 to 6. 13. The heating cooker according to claim 2, wherein the number of revolutions of the fan during range cooking is set to be lower than the number of revolutions of the fan during oven cooking.