JP2561535Y2 - Cooker - Google Patents

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 a function of automatically controlling a cooking time of microwave heating by detecting water vapor, a function of grill heating, and a function of purifying exhaust gas by an oxidation catalyst when heating an oven. It is.

[0002]

2. Description of the Related Art Automated heating of a microwave oven has been advanced, and optimum heating can be easily performed without any trouble. This automatic heating method focuses on infrared rays radiated from the heated object, focuses on water vapor and gas generated from the heated object, and focuses on the temperature of the indoor air heated by the heated object , Etc. Each of these methods has advantages and disadvantages, but among them, the method of determining the heating time by detecting the humidity with a humidity sensor in microwave heating where the amount of water vapor increases due to the heat generation of the object to be heated is the first practical use as an automatic microwave oven Was (For example,
See -298676. In the case of a type that detects temperature information in a refrigerator or water vapor information using a sensor, the sensor's sensing ability may be improved by controlling the rotation of the fan.

[0003] In addition, since the microwave or oven function has been mounted on the microwave oven, the automatic control function at the time of heating the microwave oven has been supported.

[0004]

[Problems to be Solved by the Invention] When the exhaust fan is operated at a low speed, it takes more time to reach the specified number of revolutions when the motor is cold and when the motor is hot after normal operation. . This is because the starting torque at low rotation is small and the viscosity of the lubricant in the motor is high.

[0005] In the control of the type that detects the amount of water vapor during microwave heating, the cooking time cannot be accurately calculated if the rotation of the exhaust motor is uneven because it is easily affected by the flow velocity of the water vapor flowing through the sensor unit.

[0006] Also, in grill cooking accompanied by smoking, similar rotation unevenness adversely affects the deodorizing function.

[0007]

Means for Solving the Problems Heating energy generating means such as a magnetron for supplying microwaves to the heating chamber and a grill heater installed in the ceiling space of the heating chamber, and an exhaust air passage from the heating chamber to the outside of the heating chamber A heating cooker having an exhaust fan and a humidity sensor therein for detecting steam generated during heating, a semiconductor (thyristor, triac, etc.) for rotating the exhaust fan by on / off control, and the heating energy generating means. Immediately after heating is set and before heating starts, set the exhaust fan to 1
Rotation at a power supply rate of 00% prevents rotation unevenness at startup,
At the time of full-scale steam generation, a control circuit for controlling a predetermined low-speed rotation so that the humidity sensor has a good flow rate of the steam with good sensitivity is connected to the heating energy generating means and the exhaust fan.

[0008]

The exhaust fan is rotated by the on / off control of the semiconductor, and immediately after the microwave heating by the magnetron or the heating setting of the grill heater, the exhaust fan is rotated at a duty ratio of 100% and started before the heating is started as follows. This prevents rotation unevenness at the time, and sets a predetermined low-speed rotation at the time of full-scale steam generation so that the humidity sensor has a good sensitivity to the steam flow rate.

(1) After the exhaust fan is rotated at a duty ratio of 100% for a certain period of time, it is reduced to a predetermined low speed and rotated for a certain period of time.

(2) The exhaust fan is rotated at a constant speed for a certain period of time after the exhaust fan has been rotated at a predetermined low speed from full rotation at 100% energization.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a heating cooker according to an embodiment of the present invention. FIG. 2 is an example of an operation explanatory view of the suction type exhaust fan, and FIG. FIG. 4 is a diagram showing electric power supplied to the exhaust fan.

In FIG. 1, reference numeral 1 denotes a heating chamber, 2 denotes a heater for generating hot air, and 3 denotes a hot air fan for circulating the hot air into the heating chamber 1. Reference numerals 4 and 5 denote grill heaters provided on the ceiling of the heating chamber. These grill heaters 4 and 5 are covered with a perforated metal plate 6 so that a good grill heating effect is exhibited. Reference numeral 7 denotes an exhaust air passage that passes through the space inside the heating chamber 1 where the grill heater 5 is installed and the outside of the cooker body.
Reference numeral 9 denotes an exhaust outlet of the exhaust air passage 7, and 9 denotes an oxidation catalyst provided in the exhaust air passage 7. Reference numeral 10 denotes a suction-type exhaust fan provided in the exhaust air passage 7 in the middle of the oxidation catalyst 9 and the exhaust outlet 8, and sucks air in the heating chamber 1 through the exhaust air passage 7 and removes the air from the cooking device body. Discharge to Reference numeral 11 denotes a humidity sensor which is installed immediately before the exhaust outlet 8 in the exhaust air passage 7 and detects water vapor in the air in the heating chamber 1 exhausted from the exhaust air passage 7. 12 is a magnetron for generating high frequency,
Although not shown, microwaves are supplied into the heating chamber 1 through a waveguide, and the grill heaters 4 and 5 constitute heating energy generating means. 1
Reference numeral 3 denotes a weight sensor for detecting the weight of the food material stored in the stewed container 14 or the like in the heating chamber 1. Reference numeral 15 denotes the heaters 2, 4, 5, magnetron 12, and exhaust fan 1 described above.
0 is a control circuit for controlling the operation of the exhaust fan 10 according to a program such as a microcomputer, and sometimes using water vapor information detected by the humidity sensor 11 and weight information detected by the weight sensor 13. Semiconductor (for example, thyristor, triac, etc.) 1
6. 17 is an opening / closing door mounted on the entire surface of the heating chamber, and 18 is a finder glass of the door.

A case in which the above-described embodiment is operated as a microwave cooking device will be described with reference to FIG.

In the case of the microwave by the magnetron 12, there is a time for measuring the weight of the food from the point A at which the button for starting heating is pressed to the point B at which power is supplied. During this time, the exhaust fan 10 is energized at 100%, the rotation of the motor of the exhaust fan 10 is made smooth, and the time for measuring the weight by the weight sensor 13 is also about 10 seconds. Ten seconds after power is supplied to the magnetron 12, the exhaust fan 10 is turned on and off by the semiconductor 16 (for example, a triac) to operate at a low speed. The control method at this time is phase control, so that the closing phase is likely to be shifted, so that the control method is in units of one cycle.

During this time, since the amount of water vapor is small, if the flow velocity is high, the humidity sensor 11 cannot detect the vapor well,
This operation is performed. Thereafter, when reaching a certain water vapor detection level, the exhaust fan 10 is fully rotated as shown in C. By setting the electric conduction rate to 100%, fogging of the finder glass 18 is prevented, and steam in the heating chamber 1 is discharged to the outside of the heating chamber 1. Thereafter, the duty ratio is set to 100% until the end of cooking D. Even after the cooking is completed, the vapor near the humidity sensor 11 is removed so that the cooking can be normally detected even if the cooking is repeated immediately.

That is, the exhaust fan 10 is fully rotated for a moment immediately before the heating to make the rotation of the motor smooth so that the steam detection can be performed most efficiently. Then, when the heating is started, the duty ratio of the exhaust fan 10 is reduced to about 40%. When the amount of steam is increased so that the finder glass 18 of the door is not fogged by the steam, the electricity is supplied to 100%.

Another embodiment in the case of operating as a microwave heating cooker will be described with reference to FIG.

In the case of the microwave generated by the magnetron 12, there is a time for measuring the weight of the food from the point A at which the heating start button is pressed to the point B at which power is supplied. During this time, the exhaust fan 10 is energized at 100%, the rotation of the motor of the exhaust fan 10 is made smooth, and the time for measuring the weight by the weight sensor 13 is also about 10 seconds. Ten seconds after power is supplied to the magnetron 12, the exhaust fan 10 is turned on and off by the semiconductor 16 (for example, a triac) to operate at a low speed.

At this time, if the phase control is used, the applied phase is likely to be shifted, so that the control is performed in units of one cycle.
As shown in FIG. 4, the duty ratio is reduced for each cycle, and the rotation speed is reduced.

During this time, since the amount of water vapor is small, if the flow velocity is high, the humidity sensor 11 cannot detect the vapor well.
This operation is performed. Next, when the amount of generated steam starts to become remarkable after the number of revolutions is reduced to a specified number of revolutions, the motor is rotated at a specified number of revolutions until a signal reaches a preset water vapor detection level as shown at point C. Thereafter, when reaching a certain water vapor detection level, the exhaust fan 10 is fully rotated as shown at point D. By setting the duty ratio to 100%, fogging of the finder glass 18 is prevented, and the heating chamber 1
The internal water vapor is discharged out of the heating chamber 1. Thereafter, the power supply rate is set to 100% until the end of cooking E. Even after cooking is completed, the vapor near the humidity sensor 11 is removed for one minute up to F, so that normal detection can be performed even if cooking is repeated immediately.

That is, the exhaust fan 10 is fully rotated for a moment immediately before the heating to make the rotation of the motor smooth so that the steam detection can be performed most efficiently. Then, when the heating is started, the duty ratio of the exhaust fan 10 is reduced to about 40%. Then, the rotation is gradually reduced until the generation of water vapor becomes remarkable. When the amount of vapor becomes large so that the finder glass 18 of the door does not fog with the vapor, 100% current is supplied.

By doing so, in both of the above-described embodiments, water drops and the like do not drop from the gap between the opening / closing door 17 and the main body. In addition, the problem of poor rotation of the motor of the exhaust fan 10 that occurs when the cooker body feels cold is eliminated. The microwave heating and the duty ratio of the exhaust fan 10 are controlled to effectively operate the oxidation catalyst 9 even when the grill is heated, thereby purifying the exhaust gas.

[0024]

As described above, according to the present invention, a heating energy generating means, an exhaust fan and a humidity sensor are provided in an exhaust air passage from the heating chamber to the outside of the heating chamber, and the water vapor generated during heating is detected. In the heating cooker having the configuration, the control means has a semiconductor for rotating the exhaust fan by on / off control, and the heating fan is set to 10 before the heating is started immediately after the heating setting of the heating energy generating means.
Since it is controlled to rotate at a predetermined low speed after rotating for a certain period of time at 0% duty ratio, uneven rotation at the start of microwave cooking is prevented, and the sensitivity of the humidity sensor is good when full-scale steam generation is performed. The flow rate makes the response of the humidity sensor more accurate and improves the deodorizing efficiency of grill cooking.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a cooking device showing one embodiment of the present invention.

FIG. 2 is an example of an operation explanatory view of the suction type exhaust fan.

FIG. 3 is another example of the operation explanatory view of the suction type exhaust fan.

FIG. 4 is a diagram showing electric power supplied to an exhaust fan.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating chamber 5, 5 Grill heater (heating energy generating means) 7 Exhaust air path 10 Exhaust fan 11 Humidity sensor 12 Magnetron (heating energy generating means) 15 Control circuit 16 Semiconductor

Claims (4)

(57) [Scope of request for utility model registration] 1. A heating energy generating means in a heating chamber (1) (for example, a magnetron (12) for supplying a microwave into the heating chamber (1)) or a grill installed in a ceiling space in the heating chamber (1). Heaters (4, 5), etc., and an exhaust fan (10) and a humidity sensor (11) in an exhaust air path (7) communicating from the inside of the heating chamber (1) to the outside of the heating chamber (1). In the heating cooker configured to detect the steam to be heated, immediately after the heating setting by the heating energy generating means (4, 5, 12) is started and before the heating is started, the exhaust fan (10) is turned on at a 100% duty ratio. A control circuit (15) for controlling rotation so as to prevent rotation unevenness at the time of start-up and performing a predetermined low-speed rotation at the time of full-scale steam generation so that the humidity sensor (11) has a good flow rate of steam with good sensitivity is provided by a heating energy generating means ( 4, 5, 12 ) And an exhaust fan (10). 2. Immediately after the heating setting by the heating energy generating means is started, before the heating is started, the exhaust fan (10) is rotated at a duty ratio of 100% for a fixed time, and then reduced to a predetermined low speed for a fixed time. The cooking device according to claim 1, wherein the cooking device is rotated. 3. Immediately after the start of the heating setting by the heating energy generating means, until the steam starts to be emitted from the object to be heated, the number of revolutions of the exhaust fan (10) is gradually reduced from the full rotation of 100% energization to a predetermined low speed. 2. The heating cooker according to claim 1, wherein the heating cooker is rotated for a certain period of time. 4. A control circuit (15) comprising a semiconductor (thyristor, triac, etc.) (16) in the control circuit (15), wherein the exhaust fan (10) is rotated by on / off control by the semiconductor (16). Heating cooker.