JPH06229560A - Heating and cooking device - Google Patents

Abstract

PURPOSE:To enable either water vapor or gas such as alcohol to be well detected. CONSTITUTION:A control circuit 33 stops driving of an oven fan motor 19b during a period in which an amount of gas is detected by a vapor sensor 28 and an alcohol sensor 29, and drives a machine chamber fan motor 17b for a machine chamber fan which is a fan for use in supplying external air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a hot air generating device for circulating hot air in a cooking chamber, which comprises an oven heater and an oven fan as heating means, and a gas sensor for detecting water vapor, alcohol or the like in the cooking chamber. The present invention relates to a heating cooker including.

[0002]

2. Description of the Related Art Conventionally, a heating cooker of this type is shown in FIG.
The configuration shown in is known. That is, a hot air supply device 2 having an oven heater 2a and an oven fan 2b is provided on the back side of the back plate 1a of the heating and cooking chamber 1. Further, an exhaust passage 3 is formed so as to communicate from the inside of the cooking chamber 1 to the outside of the device, and the exhaust passage 3 has an exhaust passage 3 formed therein.
A vapor sensor 4 for detecting water vapor and an alcohol sensor 5 for detecting alcohol are provided. Further, a machine room 6 is provided next to the cooking room 1,
Inside this, a magnetron 7 and a machine room fan 8 are provided. A supply port 1 a for supplying the air from the machine room fan 8 into the cooking chamber 1 is formed on the side wall of the cooking chamber 1. A damper 9 is provided at the supply port 1a.

In such a heating cooker, steam and alcohol are detected at the beginning of heating cooking during oven cooking in which the hot air supply device 2 is driven, and heating cooking is controlled according to the detection result. ing. That is, when the cooking is started, the oven heater 2a
And the oven fan 2b is driven to supply hot air into the cooking chamber 1 for circulation. At the same time, the damper 9 drives the machine room fan 8 with the damper 9 closed. The purpose of driving the machine room fan 8 is to cool electric components (for example, the optical sensor 10) in the machine room 6. In this case, the wind from the machine room fan 8 is discharged from a discharge port (not shown).

Then, for a certain period of time from the start of cooking,
The amount of water vapor and the amount of alcohol are detected by the vapor sensor 4 and the alcohol sensor 5, respectively, and the amount of cooked food is determined based on the detection results. Then, the remaining time or the like is determined according to the determination result, and the heating and cooking is controlled accordingly.

When the magnetron 7 is driven by a microwave oven, the damper 9 is opened and the machine room fan 8 is opened.
Is driven. In this case, the purpose of driving the machine room fan 8 is to blow air to prevent the inner surface of the door window from being fogged.

[0006]

However, in the above-mentioned conventional configuration, since the oven fan 2b is driven at the time of detection by the sensors 4 and 5, steam and alcohol generated from the food to be heated are heated in the cooking chamber. There is a problem that the hot air circulated in 1 diffuses the inside of the cooking chamber 1 and thus the detection of water vapor or alcohol by the sensors 4 and 5 becomes insufficient. As a result, the heating and cooking control may be inaccurate.

The present invention has been made in view of the above circumstances, and an object thereof is to detect a gas such as water vapor or alcohol, which can be detected well, and thus heating control can be performed well. To provide a cooker.

[0008]

The cooking device according to the present invention comprises:
A hot air generator that has an oven heater and an oven fan to circulate hot air in the heating cooking chamber, and a gas that is provided in an exhaust passage leading from the heating cooking chamber to the outside of the cooking chamber to detect gas such as water vapor or alcohol in the heating cooking chamber. A gas sensor for detecting the amount of gas in the cooking chamber, an external air supply fan for supplying external air to the heating chamber is provided, and a gas amount detection period by the gas sensor is provided. Is provided with a fan drive control means for stopping or weakly driving the oven fan and driving the external air supply fan.

In this case, a damper for opening and closing the blower port for supplying the external air from the external air supply fan to the heating and cooking chamber is provided, and the damper is opened during the gas amount detection period by the gas sensor. Alternatively, instead of this, a blowing port for supplying external air to the heating and cooking chamber by an external air supply fan may be always open.

[0010]

According to the above means, the oven fan is stopped or weakly driven during the gas amount detection period by the gas sensor, so that the diffusion of the gas generated from the food to be heated can be suppressed in the cooking chamber. This increases the gas detection efficiency of the gas sensor. In this case, if the probability of the gas coming into contact with the gas sensor is further increased, the gas detection efficiency can be expected to be further improved.

According to the above means, however, during the gas amount detection period by the gas sensor, in addition to stopping or weakly driving the oven fan and driving the external air supply fan, the gas in the heating cooking chamber is included. Air can be positively supplied to the gas sensor, further improving gas detection efficiency. As a result, the cooking control can be favorably performed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. First, in FIG.
The cooker main body 11 is configured by disposing an inner box 13 inside an outer box 12, the inside of the inner box 13 serves as a heating cooking chamber 14, and the space between the inner box 13 and the outer box 12 is a machine. A chamber 15 is formed. In the machine room 15, a magnetron 16 and a machine room fan 17 that also serves as a fan for supplying external air are arranged. The machine room fan 17 includes blades 17a and a machine room fan motor 17b. Also,
A large number of vent holes 14b are formed in the back plate 14a of the heating and cooking chamber 14, and an oven heater 18 and an oven fan 19 (this is a blade 19) are formed on the back surface side of the back plate 14a.
a and an oven fan motor 19b) are provided.

Further, the magnetron 16 portion is provided with a wind guide portion 21 communicating with the inside of the cooking chamber 14.
A damper 23 is provided at the blower port 22 of the wind guide unit 21. The damper 23 is adapted to be opened and closed by a damper motor 23a shown in FIG. The front opening of the cooking chamber 14 is opened and closed by a door 24.

An optical sensor light-transmitting hole 25 is formed in a side wall 13a of the inner box 13 on the machine chamber 15 side, and the side wall 13a faces the optical sensor light-transmitting hole 25 from the machine chamber 15 side. A light emitting element 26 of an optical sensor is attached to. It should be noted that the light receiving element 26 paired with the light emitting element 26
b (see FIG. 1) is provided on the side wall 13b opposite to the side wall 13a. This optical sensor is for detecting the presence or absence of the food to be cooked in the cooking chamber 14.

Further, an exhaust passage 27 is formed in the side wall 13b so as to communicate with the outside of the apparatus. The exhaust passage 27 is a vapor sensor 28 for mainly detecting water vapor, which is a gas sensor.
And an alcohol sensor 29 for mainly detecting alcohol
Is provided. The operation panel 30 provided on the front surface of the cooker body 11 is provided with various switches 31 (shown in FIG. 1) and a display 32 (also shown in FIG. 1).

FIG. 1 shows an electrical configuration. The control circuit 33 includes an A / D converter and a microcomputer, which includes the light receiving element 26a,
Signals from the vapor sensor 28, the alcohol sensor 29, and the various switches 31 are given. Then, the control circuit 33 operates in accordance with the operation program stored therein by the magnetron 16 and the machine room fan motor 1
7b, oven heater 18, oven fan motor 19
The drive circuit 34b and the damper motor 23a are drive-controlled via the drive circuit 34, and the light-emitting element 26 and the display 32 are drive-controlled.

In this embodiment, the heating specifications include a microwave oven specification and an oven range specification. In the microwave oven specification, the microwave is output by driving the magnetron 16 to heat and cook the food to be heated. At this time, the damper 2
3 is opened, the machine room fan 17 is operated, and the machine room 1
Electrical components such as the magnetron 16 and the light emitting element 26 in 5 are air-cooled, and the air is put into the cooking chamber 14 to prevent the inner surface of the door 24 from being fogged.

Further, in the oven range specification, the control circuit 33 functions as a fan drive control means and executes cooking according to the oven specification according to the flow chart shown in FIG. That is, various switches 3
When the "oven" selection switch of 1 is operated and then the start switch is operated, this flowchart starts.

First, the oven heater 18 is energized (step S1), the machine room fan motor 17b is energized, and the damper motor 23a is driven to open the damper 23 (step S2). Here, although the oven fan motor 19b is conventionally energized and driven, in the present embodiment, the oven fan motor 19b is not driven.
Then, by the machine room fan motor 17b, the outside air, in this case the air in the machine room 13, is supplied into the heating and cooking room 14 through the wind guide portion 21 and the blower opening 22, and the air flows through the exhaust passage 27 to the outside of the unit. Is discharged to. At this time,
Since the oven fan 19 is not driven, the diffusion of gas such as steam or alcohol generated from the food to be heated is suppressed in the cooking chamber 14, and the gas-containing air is discharged through the exhaust passage 27 to the steam sensor 28 and Good contact with the alcohol sensor 29.

Next, based on the detection signals from the alcohol sensor 29 and the vapor sensor 28, 30 is set from the start of cooking.
While measuring the maximum value Amax and Bmax of the detected value in a second (step S3 and step S4),
The detection values A and B after 30 seconds are measured (step S5).
And step S6). In this case, the gas amount change rate X is calculated from the maximum values Amax and Bmax and the detected values A and B (step S7). This gas amount change rate X is X = {1- (A / Amax)}-{1- (B / Bma
x)}.

Then, it is judged whether or not this gas amount change rate X is below the judgment reference value "0.05" in this case (step S8), and if it is below, the amount of cooked food is "small". It is determined that the amount of food to be heated is “large” (step S1).
0). Then, after that, the oven fan motor 19b is energized to drive it, and the damper motor 23a is cut off to close the damper 23 (step S11). With this,
The hot air generated by the hot air supply device 20 is supplied into the heating cooking chamber 14 and circulated. As a result, the food to be heated is cooked. At this time, the machine room fan motor 17b
Since the power is not cut off, the air blowing action of the machine room fan 17 is continued, whereby the electrical equipment (light emitting element 26) in the machine room 15 is cooled.

According to the present embodiment described above, the vapor sensor 2
8 and the driving of the oven fan 19 are stopped during the gas amount detection period by the alcohol sensor 29 (30 seconds from the start of cooking), it is possible to suppress the diffusion of gas generated from the food to be heated in the cooking chamber 14. You can
This increases the gas detection efficiency. Moreover, according to this embodiment, the vapor sensor 28 and the alcohol sensor 2 are provided.
During the gas amount detection period by 9, the oven fan 19 is not driven and the machine room fan 17, which is an external air supply fan, is driven. Further, the alcohol sensor 29 can be positively supplied to further improve the gas detection efficiency.

That is, when the oven fan 2b is driven and the machine room fan 8 is not driven in the gas detection period as in the conventional case shown in FIG. 8, as shown in FIG. At the time of the determination, the gas amount change rate X is close to the determination reference value, and the determination accuracy may be poor. However, in the present embodiment, the gas amount change rate X is significantly larger than the determination reference value. And the accuracy of judgment is greatly improved. As a result, the cooking control can be favorably performed.

In particular, in this embodiment, since the existing machine room fan 17 is used as the external air supply fan, the structure can be simplified and the cost can be reduced.

Next, FIG. 5 shows a second embodiment of the present invention. In this embodiment, the blower port 22 is not provided with a damper and the blower port 22 is always open. . Also, it does not have an optical sensor. Also in this embodiment, the oven fan 19 is not driven during the gas amount detection period by the vapor sensor 28 and the alcohol sensor 29, and the machine room fan 17, which is an external air supply fan, is driven. Then, if this gas amount detection period elapses, electrical components (optical sensors) to be cooled
Is not present, the drive of the machine room fan 17 is stopped.
Also in such an embodiment, the same effect as that of the first embodiment can be obtained. When the microwave oven is used, the machine room fan 17 is driven to prevent the inside of the window of the door 24 from being fogged.

FIGS. 6 and 7 show a third embodiment of the present invention, which is different from the first embodiment in the following points. That is, the machine room 15 is provided with a tubular body 42 that constitutes the duct 41, and one end of the tubular body 42 is airtightly connected to the blower port 43 formed in the side wall 13 a of the cooking chamber 14. The other end is airtightly connected to a vent 44 formed in the side plate of the outer box 12. Thus, the duct 41 connects the inside of the cooking chamber 15 and the outside of the outer box 22 and is airtightly partitioned from the machine chamber 15.

An external air supply fan 45 is provided in the duct 41. This external air supply fan 45
Includes a centrifugal blade 46, a casing 47, and a motor 48 that rotationally drives the centrifugal blade 46. The centrifugal blades 46 and the casing 47 are arranged inside the duct 41, and the motor 48 is arranged outside the duct 41. The machine room fan 49 provided in the machine room 15 does not function as the external air supply fan of the present invention, as will be apparent from the description below.

In the third embodiment, the gas amount detection period by the vapor sensor 28 and the alcohol sensor 29 (3 hours from the start of cooking) when the microwave oven is used.
0 seconds) stops driving the oven fan 19, and
The external air supply fan 45 is driven.
Then, the external air supply fan 45 is stopped when the gas amount detection period elapses. Further, in this case, the machine room fan 49 is driven from the start to the end of cooking in order to air-cool the electric components (such as optical sensors).

When the microwave oven is used, the external air supply fan 45 is driven to prevent the inside of the window of the door 24 from being fogged, and the machine room fan 49 is driven to cool the magnetron 16 by air.

Also in the third embodiment, the oven fan 19 is stopped and the external air supply fan 45 is driven during the gas amount detection period. Therefore, the third embodiment is similar to the first embodiment. Produce an effect.

In each of the embodiments described above, the driving of the oven fan is stopped during the gas amount detection period.
The oven fan may be driven weakly, and in this case, the heat of the oven heater can be prevented from staying in the vicinity of the oven heater in addition to achieving the initial purpose.

[0032]

As is apparent from the above description, according to the present invention, the oven fan is stopped or weakly driven and the external air supply fan is driven during the gas amount detection period by the gas sensor. Alternatively, with respect to the detection of a gas such as alcohol, this has an excellent effect that it can be detected satisfactorily and heating and cooking control can be satisfactorily performed.

[Brief description of drawings]

FIG. 1 is a block diagram of an electrical configuration showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional plan view of the heating cooker.

FIG. 3 is a flowchart showing control contents.

FIG. 4 is a diagram showing characteristics of a gas amount change rate.

FIG. 5 is a view corresponding to FIG. 2 showing a second embodiment of the present invention.

FIG. 6 is a diagram corresponding to FIG. 2 showing a third embodiment of the present invention.

FIG. 7 is a vertical sectional front view of a fan portion for supplying external air.

FIG. 8 is a view corresponding to FIG. 2 showing a conventional example.

[Explanation of symbols]

Reference numeral 16 is a magnetron, 17 is a machine room fan (a fan for supplying external air), 18 is an oven heater, 19 is an oven fan, 20 is a hot air generator, 22 is a ventilation port, 23 is a damper, 28 is a vapor sensor (gas sensor). , 29 is an alcohol sensor (gas sensor), 33 is a control circuit (fan drive control means), 43 is a blower port, 45 is an external air supply fan, and 49 is a machine room fan.

Claims (3)

[Claims] 1. A hot air generator having an oven heater and an oven fan to circulate hot air in the heating cooking chamber, and an exhaust passage communicating from the heating cooking chamber to the outside of the cooking chamber, such as steam or alcohol in the heating cooking chamber. A gas sensor for detecting gas is provided, and the amount of gas in the cooking chamber is detected by this gas sensor,
An external air supply fan for supplying external air to the heating and cooking chamber is provided, and during the gas amount detection period of the gas sensor, the fan drive is stopped or weakly driven and the external air supply fan is driven. A heating cooker characterized by comprising means. 2. A blower for supplying external air to the cooking chamber with an external air supply fan is provided with a damper for opening and closing the fan so that the damper is opened during the gas amount detection period by the gas sensor. The cooking device according to claim 1, wherein 3. The heating cooker according to claim 1, wherein a blower port for supplying external air to the heating cooking chamber by an external air supply fan is always open.