JPH1038284A - Heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the variation of temperature in a heating and cooking chamber and improve temperature rise preventing effect with respect to an outer casing. SOLUTION: A heating and cooking chamber 13 is provided in an inner casing 3. A heat insulating member 25, constituted of two sheets of heat insulating plates 26a, is mounted on the bottom plate 3a of the inner casing 3 while another heat insulating member 27, constituted of one sheet of the heat insulating plate 26a, is mounted on one side plate 3b. A heat shielding plate 28, constituted of a metallic plate, is attached to an upper plate 3c so as to cover a heater 18 while interposing an air layer 29. In this case, the other side plate 3d of the inner casing 3 is not provided with the heat insulating member. Accordingly, the degree of heat insulation of the casing 3 is constituted so as to be reduced in the sequence of the bottom plate 3a, one side plate 3b, the upper plate 3c and the other side plate 3d of the inner casing 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cooking device having an improved cooling structure.

[0002]

Conventionally, in a heating cooker having an oven function and a grill function using a heater as a heat source and a microwave oven function using a magnetron as a heat source, the cooking device body is made of an outer box. The inner box is provided with a predetermined space inside. A suction port and an exhaust port are formed in a bottom plate portion of the outer box in a state of being partitioned by a partition plate. When the inner box is moved toward one side plate of the outer box, a machine space is formed by a relatively large space on the opposite side. A magnetron and various electric parts are arranged in the machine room, and an auxiliary exhaust port is formed in a rear plate portion of the machine room. Further, heaters are provided on the upper plate portion and the bottom plate portion of the inner box.

Further, in this apparatus, when cooking in an oven or grill using a heater, the temperature of the outer box rises due to the heat of the heater. To prevent this, a fan device provided in the machine room is used to prevent external air from rising. Into the machine room through the suction port and into the machine room, through the space between the outer case and the inner case, that is, the space around the inner case, and out of the outlet of the bottom plate of the outer case. I have to. Thereby, the temperature rise of the outer box can be suppressed.

[0004] In the above-described apparatus, since the temperature of the freshly sucked air is low, a part of the cooking chamber which comes into contact with the cold air is locally cooled, so that temperature unevenness occurs in the heating chamber. In some cases, unevenness may occur in the object to be heated. Except for the auxiliary exhaust port on the rear plate of the machine room, there is no exhaust opening on the upper plate, the rear plate and the side plate of the outer box. The gas is discharged from the exhaust port of the bottom plate, and the cooking device body can be brought closer to the side wall. However, although it can suppress the temperature rise of the outer box as a whole, there are some places where the temperature is high,
Further improvements are expected in preventing the temperature of the outer box from rising.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a heating cooker that eliminates temperature unevenness in a heating cooking chamber and improves the effect of preventing a temperature rise in an outer box.

[0006]

According to a first aspect of the present invention, there is provided an outer box and an inner box disposed inside the outer box with a space between the inner surface and the inner box. A cooking device main body having a cooking chamber inside the box, a heat source for heating an object to be heated housed inside the cooking chamber, and a position facing the bottom plate of the inner box at the bottom plate of the outer box. A discharge port formed in a bottom plate portion of the outer box in a state where the suction port is partitioned from the inner box and the outer box; The air outlet is drawn in through the space portion below the bottom plate portion of the inner box, the space portion on one side plate portion, the space portion on the upper plate portion, and the space portion on the other side plate portion in order. And the inner box has a heat insulating effect on the inner box. Constructed and a large set insulating means from position of insulation degree.

[0007] In this configuration, since the heat insulating means is configured so that the degree of heat insulation of the inner box bottom plate portion facing the suction port is larger than the degree of heat insulation of other parts, the temperature unevenness in the cooking chamber is eliminated. In addition, the effect of suppressing the temperature rise on the outer box is improved. That is, it was found that the following phenomena were observed if there was no heat insulating means. Now, when the fan device is operated, the external air is sucked from the suction port, and the space below the bottom plate of the inner box, the space on the side of one side plate, the space on the top of the upper plate, and the other space. The air passes through the space on the side of the side plate portion and is discharged from the exhaust port.

In this case, the external air which is the cooling air is
First, heat exchange is performed with the inner box bottom plate (heating cooking chamber bottom plate) facing the suction port. At this time, since most of the external air directly blows against the inner box bottom plate portion and the external air is still in a low temperature state, it is expected that the heat exchange amount here is large. For this reason, the temperature of the bottom plate portion in the heating cooking chamber excessively decreases, and the temperature of the external air also increases immediately. If the temperature of the external air rises in the initial stage, the heat exchange rate thereafter decreases, and the effect of suppressing the rise in the temperature of the outer box decreases.

However, in the above-described structure of the present invention, the heat insulating means is configured such that the degree of heat insulation of the inner box bottom plate portion facing the suction port is larger than the degree of heat insulation of the other parts. In addition, the heat exchange action at the bottom plate of the inner box, which is expected to have a large amount of heat exchange, is suppressed, a large temperature drop at the bottom plate of the cooking chamber is suppressed, and the temperature unevenness in the cooking chamber is eliminated. Further, since the temperature of the external air does not excessively increase in the initial stage, the heat exchange rate does not decrease thereafter, and the effect of suppressing the temperature increase of the outer box is improved.

According to the second aspect of the present invention, the degree of heat insulation in the heat insulating means is reduced in the order of the inner box bottom plate facing the suction port, one side plate, the upper plate, and the other side plate on the outer surface of the inner box. It has a configuration. According to this, the degree of heat insulation decreases in the order in which the temperature decrease in the cooking chamber is predicted to decrease gradually, and the temperature in the cooking chamber can be made more uniform. Further, since the heat exchange rate is gradually increased, the effect of suppressing the temperature rise of the outer box can be also satisfactorily achieved.

According to a third aspect of the present invention, the heat source comprises an upper heater and a lower heater provided on an upper plate portion and a bottom plate portion of the inner box, respectively. The wind receiving plate is disposed at a corner portion between the upper plate portion and the other side plate portion. According to this, when the heater as a heat source of the heating cooker is provided in the upper plate portion and the bottom plate portion of the inner box, the temperature suppressing effect on the outer box is further improved.

That is, the external air is sucked from the suction port by the operation of the fan device, and the space below the bottom plate of the inner box, the space beside one of the side plates, the space above the upper plate, The air is discharged from the exhaust port through the space on the side of the other side plate in order.In this case, since the upper heater and the lower heater are present on the upper plate and the bottom plate of the inner box, respectively,
The temperature of the external air that has passed through the two heater portions is rising, and thereafter, since there is only an exhaust port as a heat escape port, it is expected that the temperature will further increase during that time. And, since the wind receiving plate is disposed at the corner portion between the upper plate portion and the other side plate portion of the inner box, the external air passing through the two heater portions hits this wind receiving plate, As a result, a rise in the temperature of the outer box can be suppressed as compared with a case where the outer box directly hits a corner portion of the outer box.

According to a fourth aspect of the present invention, a magnetron and a heater are provided as a heat source, and microwave cooking by the magnetron and heater cooking by the heater are switched to be performed. This is a configuration for reducing the air volume of the device. According to this, at the time of heater cooking, the temperature rises when the external air passes through the heater portion. In this case, since the air volume is small, the wind (external air) hits the corner of the outer box, but the outer box is excessively heated. It is rare to raise.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. First, a schematic configuration will be described with reference to FIGS. The cooker main body 1 of the heating cooker includes an outer box 2 and an inner box 3. That is, the outer box 2 has a bottom plate 2a and one side plate 2
b, upper plate 2c, other side plate 2d, and rear plate 2e
(See FIG. 5), and has a rectangular box shape with an open front surface. The inner box 3 includes a bottom plate 3a, one side plate 3b, an upper plate 3c, the other side plate 3d, and a rear plate 3e (see FIG. 5).
And has a rectangular box shape with an open front surface.

An inner box 3 is arranged inside the outer box 2 with a space between the inner box 3 and the inner surface of the outer box 2. In this case, the inner box 3 is disposed slightly to the left of the inside of the outer box 2 when viewed from the front, and a machine room 4 is formed by a space opposite thereto. Inside the machine room 4, for example, a magnetron (heat source) 5, a high-pressure transformer 6, a high-pressure condenser 7, etc. used for microwave cooking are arranged, and a damper device 8, and further a fan device 9 are arranged. ing.

The damper device 8 includes damper ports 8a, 8a formed in the side plate of the inner box 3, a damper plate 10 for opening and closing the damper ports 8, 8a, a damper motor 11, and a rotation of the damper motor 11. And an opening and closing mechanism 12 for opening and closing the damper plate 10. The fan device 9 includes a fan motor 9a and a fan 9b, and is provided so as to blow air downward to a lower portion of the magnetron 5.

The interior of the inner box 3 is a cooking chamber 13.
It has been. A cooking chamber 13 is provided on the front of the cooker body 1.
A door 14 for opening and closing is provided, and an operation panel 15 is provided. The rear side of the operation panel 15 is the machine room 4. The operation panel 15 includes a switch group 16 such as a menu setting switch for setting a cooking menu, an output setting switch for setting an output, a setting switch for setting time, and a start switch (see FIG. 4).
Are provided, and a display 17 is provided.

The upper plate portion 3c and the bottom plate portion 3 of the inner box 3 are provided.
An upper heater 18 and a lower heater 19 as heat sources are respectively disposed at a and a. The upper heater 18 is configured by a tubular heater, and the lower heater 19 is configured by a planar heater. Almost the entire bottom plate portion 2a of the outer box 2 (the machine room 4
(Including the bottom plate portion region) is formed with a suction port 20 composed of a small hole. In this case, most of the suction ports 20 are in a positional relationship facing the bottom plate 3 a of the inner box 3.

An exhaust port 21 is formed on the left side of the bottom plate 2a of the outer box 2, and is provided between the bottom plate 2a of the outer box 2 and the bottom plate 3a of the inner box 3. A partition plate 22 serving as a partition member is disposed so as to block the exhaust port 21 and the suction port 20. Further, an auxiliary exhaust port 23 (see FIG. 5) is formed in a rear plate portion of the machine room 4, that is, a rear plate portion 2e (see FIG. 5) of the outer box 2.

The inner box 3 is provided with a heat insulating means 24, which will be described below. Bottom plate 3a of inner box 3
A heat insulating member 25 is mounted on the outer surface of the heater 19. The heat insulating member 25 is configured by stacking two heat insulating plates 26a made of, for example, glass wool. And
A heat insulating member 27 composed of one heat insulating plate 26a is mounted on one side plate portion 3b. Further, in the upper plate portion 3c,
A heat shield plate 28 made of a metal plate as a heat insulating member is attached to cover the entire upper heater 18 with an air layer 29 therebetween. The heat shield plate 28 and the air layer 29 are
Although it has lower heat insulation than a, it has heat insulation for the inner box 3. The other side plate 3d of the inner box 3 has no heat insulating member. Therefore, the degree of heat insulation of the bottom plate 3a of the inner box 3 is set to be larger than the degree of heat insulation of the other parts. In particular, in the present embodiment, the bottom plate portion 3a of the inner box 3, the one side plate portion 3b, the upper plate portion 3c, and the other side plate portion 3d are lowered in this order.

On the other hand, out of the space between the outer box 2, the inner box 3, and the space, the wind receiving plate 30 is located at a corner Kr between the upper plate 3c of the inner box 3 and the other side plate 3d. 2 and the outer surface of the inner box 3. The wind receiving plate 30 has an inclined portion 30a at an upper portion, and a vertical portion 30b below the inclined portion 30a. A motor 31 for rotating a turntable (not shown) is provided on the lower surface of the bottom plate 3a of the inner box 3. Also, on the other side plate 3d of the inner box 3,
As shown in FIG. 5, an exhaust passage 32 communicating with the outside of the outer box 2 is formed. In addition, the exhaust port 21 is provided with the exhaust port 2.
An exhaust duct 21a is provided to guide the air that has flowed out from the front to the front.

FIG. 4 shows the electrical configuration. The control circuit 33 controls the display 17, the turntable motor 31, the upper and lower heaters 18, 19, and the fan motor 9a based on the switch signal from the switch group 16. And the drive control of the damper motor 11 to control the heating and cooking.

For example, when microwave oven cooking is set by the switch group 16 and the start switch is operated,
The damper ports 8a, 8a are opened, the magnetron 5 is energized, and the fan motor 9a of the fan device 9 is energized. The object to be heated in the heating cooking chamber 13 is heated by driving the magnetron 5. In this case, by the operation of the fan device 9, the external air is sucked from the suction port 20 as shown in FIG. 23
Some of the water flows into the cooking chamber 13 through the damper openings 8a, 8a, and is discharged to the outside of the outer box 2 from the exhaust passage 32 after the inside of the glass window of the door 14 becomes cloudy.
In this microwave cooking, the fan unit 9 blows the above-mentioned fogging of the glass window of the door 14 and the machine room 4
The main focus is on cooling the electrical components inside.

Here, a description will be given of heater cooking in which a cooling action between the inner box 3 and the outer box 2 is expected. When heater cooking (for example, oven cooking) is set by the switch group 16 and the start switch is operated, the damper port 8 is opened.
The upper heater 18 and the lower heater 19 and the fan motor 9a of the fan device 9 are energized in a state where a and 8a are closed. When the upper heater 18 and the lower heater 19 are energized, the object to be heated in the cooking chamber 13 is heated. Accordingly, the temperature of the inner box 3, the outer box 2, and the inside of the machine room 4 rises.

On the other hand, when the fan motor 9a is energized, the fan 9b of the fan device 9 is driven to rotate so as to have the same air volume as in microwave cooking. As shown in FIG. 1 and FIG. 6, by the rotational drive of the fan 9b, external air is sucked into the space below the bottom plate 3a from the suction port 20 to generate wind, that is, cooling air. In this case, a part of the cooling air is exhausted from the auxiliary exhaust port 23 in the rear plate of the machine room 4, but the other opening has the exhaust port 21 only in the bottom plate 2a. Most of the space passes through the machine room 4 from the bottom to the top as shown in FIG. 6, and flows into the upper space of the space between the inner box 3 and the outer box 2. It passes to the left, passes through the corner Kr, flows into the space outside the side plate portion 3d, passes through it downward, and is discharged from the exhaust port 21.

Here, most of the external air, which is cooling air, first blows directly to the bottom plate 3a of the inner box 3, and the external air is still in a low temperature state. In this embodiment, the heat exchange amount is expected to be large. However, according to the present embodiment, the heat insulating member 25 of the bottom plate portion 3a is configured by stacking two heat insulating plates 26a.
Since the heat insulation of the bottom plate 3a of the inner box 3 facing the suction port 20 is larger than the heat insulation of the other parts, the heat exchange effect in the bottom plate 3a is suppressed, and A large drop in temperature at the bottom plate portion is suppressed, and temperature unevenness in the cooking chamber 13 is eliminated. In addition, since the temperature of the external air does not excessively increase in the initial stage, the heat exchange rate does not decrease thereafter, and the effect of suppressing the temperature increase of the outer box 2 is improved.

In particular, according to the present embodiment, the degree of heat insulation is determined by the bottom plate 3a, one side plate 3b, the upper plate 3c, and the other side plate of the inner box 3 on the outer surface of the inner box 3 facing the suction port 20. Part 3
It is configured to decrease in the order of d, that is, the degree of heat insulation decreases in the order that the temperature decrease of the cooking chamber 13 is predicted to decrease gradually, and the temperature in the cooking chamber 13 can be more uniformly made uniform. . In addition, since the heat exchange rate is gradually increased, the effect of suppressing the temperature rise of the outer box 2 can be satisfactorily achieved.

Further, according to the present embodiment, the wind is located at the corner Kr between the upper plate 3c and the other side plate 3d of the inner box 3 in the space between the outer box 2 and the inner box 3. Receiving plate 3
Since the heaters 18 and 19 as heat sources of the cooking device are provided in the upper plate portion 3c and the bottom plate portion 3a of the inner box 3, the temperature control effect on the outer box 2 is reduced. It gets even better.

That is, during the operation of the fan device 9, the external air is sucked through the suction port 20 and the bottom plate 3
a lower space, one side plate 3b, a space on the side, that is, the machine room 4, a space above the upper plate 3c, and the other side plate 3d.
The air is discharged from the exhaust port 21 through the outer space in order. In this case, since the upper heater 18 and the lower heater 19 are present in the inner box 3, the external air passing through the two heater portions 18 Has increased in temperature and since then
Since there is only the exhaust port 21 as a heat escape port, it is expected that the temperature will further increase during that time. However, according to the present embodiment, the temperature between the upper plate portion 3c of the inner box 3 and the other side plate portion 3d is increased. Since the wind receiving plate 30 is disposed at the corner Kr, the external air passing through the two heaters 18 and 19 hits the wind receiving plate 30, and thereby the corner of the outer box 2 is left as it is. It is possible to suppress a rise in the temperature of the outer box 2 as compared with the case of hitting a part.

FIG. 7 shows a second embodiment of the present invention.
In this embodiment, the wind receiving plate 30 is not provided, and the control circuit 33 operates the fan motor 9a intermittently, for example, during heater cooking, so that the air volume of the fan device 9 is controlled by the microwave oven. This is to lower the air volume during cooking.

In this embodiment, the temperature rises when the outside air passes through the heaters 18 and 19 during the cooking of the heater. In this case, since the air volume is small, the wind (external air) hits the corner of the outer box 2. However, the temperature of the outer box 2 is not excessively increased. Note that the fan device 9
As a means for reducing the air volume, the rotation speed of the fan motor 9a may be controlled instead of the intermittent operation described above. Further, the heat insulating means may be configured to change the degree of heat insulation by changing the thickness of the heat insulating member of the same material.

[0032]

As apparent from the above description, the present invention has the following effects.

According to the first aspect of the present invention, the heat insulating means is configured so that the degree of heat insulation of the inner box bottom plate portion facing the suction port is greater than the degree of heat insulation of other portions. Temperature unevenness can be eliminated, and the effect of suppressing a temperature rise in the outer box can be improved.

According to the second aspect of the invention, the degree of heat insulation by the heat insulating means is determined in the order of the inner box bottom plate facing the suction port, one side plate, the upper plate, and the other side plate on the outer surface of the inner box. Since the temperature is reduced, the temperature in the cooking chamber can be made more uniform, and the effect of suppressing the rise in temperature of the outer box can be further improved.

According to the third aspect of the present invention, the heat source is constituted by the upper heater and the lower heater provided on the upper plate and the bottom plate of the inner box, respectively. Since the wind receiving plate was arranged at the corner portion between the upper plate portion and the other side plate portion of the box, hot external air passing through the heater portion hit the wind receiving plate, so that The temperature suppressing effect can be further improved.

According to the fourth aspect of the present invention, a magnetron and a heater are provided as heat sources, and microwave cooking by the magnetron and heater cooking by the heater are switched and performed. Since the air volume of the fan device is reduced by heating, the cooling air hits the corners of the outer box during heater cooking, but the temperature of the outer box can be prevented from rising excessively.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing a first embodiment of the present invention.

FIG. 2 is a partially cutaway side view of a machine room portion.

FIG. 3 is a partially broken plan view.

FIG. 4 is a block diagram showing an electrical configuration.

FIG. 5 is a diagram showing the flow of cooling air during heater cooking.

FIG. 6 is a diagram showing a flow of cooling air during microwave cooking.

FIG. 7 is a view corresponding to FIG. 1, showing a second embodiment of the present invention;

[Explanation of symbols]

1 is a cooker body, 2 is an outer box, 3 is an inner box, 4 is a machine room, 5
Is a magnetron (heat source), 8 is a damper device, 9 is a fan device, 13 is a cooking chamber, 18 is an upper heater (heat source), 1
9 is a lower heater (heat source), 20 is a suction port, 21 is an exhaust port,
22 is a partition plate, 23 is an auxiliary exhaust port, 24 is a heat insulating means, 2
5 is a heat insulating member, 26a is a heat insulating material, 27 is a heat insulating member, 28
Denotes a heat shield plate, 30 wind receiving plates, and 32 denotes an exhaust passage.

Claims (4)

[Claims] 1. A cooker having an outer box and an inner box disposed inside the outer box with a space between the inner box and the inner box, wherein the inside of the inner box is a cooking chamber. A main body, a heat source for heating an object to be heated housed in the cooking chamber, a suction port formed at a position of the bottom plate of the outer box facing the bottom plate of the inner box, and the outer box. A discharge port formed in a state where the suction port is separated from the bottom plate, and disposed between the inner box and the outer box, to suck air from the suction port, and to be disposed below the bottom plate of the inner box. One space portion, a space portion on one side plate portion, a space portion on the upper plate portion, a space portion on the other side plate portion side through the space portion, and a fan device that comes out of the exhaust port, Insulation is provided, and the degree of heat insulation of the inner box bottom plate portion facing the suction port is set to be larger than the degree of heat insulation of other parts. Heating cooker comprising a thermal insulation means that. 2. The heat insulating means is configured such that the degree of heat insulation is reduced in the order of the inner box bottom plate facing the suction port, one side plate, the upper plate, and the other side plate of the outer surface of the inner box. The cooking device according to claim 1, wherein: 3. The heat source includes an upper heater and a lower heater provided on an upper plate and a bottom plate of the inner box, respectively.
The heating cooker according to claim 1, wherein a wind receiving plate is disposed at a corner portion between the upper plate portion and the other side plate portion of the outer box, the inner box, and the space. . 4. A magnetron and a heater are provided as a heat source, and microwave cooking by a magnetron and heater cooking by a heater are switched to be performed. The cooking device according to claim 1, wherein the heating is performed.