JPH0583603U - Heating cooker - Google Patents

Abstract

(57) [Abstract] [Purpose] Prevents instability of the water vapor sensor sensitivity due to uneven rotation at low speed when the fan is started, and the water vapor flow rate at the time of water vapor detection has the best sensitivity of the sensor. The number of rotations. [Structure] Heating energy generating means in the heating chamber 1 (for example, a magnetron 12 for supplying microwaves into the heating chamber 1,
A grill heater 4 installed in the ceiling space in the heating chamber 1,
5 and the like, an exhaust air passage 7 leading from the inside of the heating chamber 1 to the outside of the heating chamber 1
In a heating cooker having an exhaust fan 10 and a humidity sensor 11 therein to detect water vapor generated during heating, a control circuit 15 having a semiconductor 16 in the exhaust fan 10
The exhaust fan 10 is rotated by the on / off control by the semiconductor 16, and immediately after the start of the heating for setting the heating by the heating energy generating means, the exhaust fan 10 is rotated at a 100% duty ratio to start. A heating cooker which prevents rotation irregularity at the time of rotation, and has a predetermined low speed rotation at the time of full-scale steam generation so that the humidity sensor 11 has a good steam flow velocity.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a heating cooker having a function of automatically controlling 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 in an oven.

[0002]

[Prior Art]

 The automation of microwave heating has progressed, and optimal heating can now be performed easily and without hassle. This automatic heating method focused on infrared rays emitted from the heated object, focused on water vapor and gas generated from the heated object, and focused on the temperature of the heated room air heated by the heated object. There are various things. Each of these methods has advantages and disadvantages, but among them, the method of detecting the humidity by the humidity sensor and determining the heating time in microwave heating in which the amount of water vapor increases with the heat generation of the object to be heated is the first practical application as an automatic microwave oven. Was transformed. (See, for example, Japanese Patent Laid-Open No. 1-298676.) Further, in the case of a type that uses a sensor to detect temperature information inside the refrigerator and water vapor information, the sensing ability of the sensor is improved by controlling the rotation of the fan. There is something to do.

Even after the microwave oven has been equipped with a grill or oven function, the microwave oven has supported the automatic control function when heating the microwave oven.

[0004]

[Problems to be solved by the device]

 When operating the exhaust fan at a low speed, it took an extra time for the motor to reach the specified number of revolutions when the motor was cold and when it was hot after normal operation. This is because the starting torque at low speed is small and the viscosity of the lubricant in the motor is high.

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

Further, even in grill cooking accompanied by smoke generation, if similar rotation unevenness occurs, the deodorizing function is adversely affected.

[0007]

[Means for Solving the Problems]

 A heating energy generating means consisting of a magnetron for supplying microwaves to the heating chamber and a grill heater installed in the ceiling space inside the heating chamber, and an exhaust fan and humidity sensor in the exhaust air passage leading from the heating chamber to the outside of the heating chamber. In addition, a heating cooker configured to detect water vapor generated during heating, has a semiconductor (thyristor, triac, etc.) that rotates an exhaust fan by on / off control, and sets the heating energy of the heating energy generation means. Immediately before the heating starts, the exhaust fan is rotated at 100% electric conductivity to prevent uneven rotation at startup, and when full-scale steam is generated, the speed of rotation is set to a predetermined low speed so that the humidity sensor has good sensitivity. The control circuit for controlling the flow velocity is connected to the heating energy generating means and the exhaust fan.

[0008]

[Action]

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

(1) The exhaust fan is rotated at a duty ratio of 100% for a certain period of time, then decelerated to a predetermined low speed rotation and rotated for a certain period of time.

(2) The exhaust fan is gradually rotated from the full rotation of 100% energization to a predetermined low speed and then rotated for a predetermined time.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view of a heating cooker according to an embodiment of the present invention, FIG. 2 is an example of operation explanatory diagram of the suction type exhaust fan, and FIG. 3 is another operation explanatory diagram of the suction type exhaust fan. 4 is a diagram showing the electric power supplied to the exhaust fan.

In the figure, 1 is a heating chamber, 2 is a heater for generating hot air, and 3 is a hot air fan for circulating the hot air in 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. 7 is an exhaust air passage that passes through the grill heater 5 installation space at the back of the heating chamber 1 and the outside of the cooker body, 8 is an exhaust air outlet of this exhaust air passage 7, and 9 is installed in the exhaust air passage 7. It is an oxidation catalyst. Reference numeral 10 denotes a suction type exhaust fan installed in the exhaust air passage 7 in the middle of the oxidizing catalyst 9 and the exhaust outlet portion 8. The suction type exhaust fan 10 sucks the air in the heating chamber 1 through the exhaust air passage 7 and uses it. Discharge to the outside. A humidity sensor 11 is installed in the exhaust air passage 7 just before the exhaust outlet 8 and detects water vapor in the air in the heating chamber 1 exhausted from the exhaust air passage 7. Reference numeral 12 is a magnetron for high frequency generation, which supplies microwaves into the heating chamber 1 through a waveguide (not shown). The grill heaters 4 and 5 constitute heating energy generating means. is doing. Reference numeral 13 is a weight sensor for detecting the weight of the food material stored in the boiling container 14 in the heating chamber 1. Reference numeral 15 indicates the operation of the above-mentioned heaters 2, 4, 5, magnetron 12, and exhaust fan 10 in accordance with a program such as a microcomputer, and occasionally the water vapor information detected by the humidity sensor 11 and the weight detected by the weight sensor 13. It is a control circuit for controlling using the information, and has a semiconductor (for example, thyristor, triac, etc.) 16 for power control of the exhaust fan 10. Reference numeral 17 is an opening / closing door attached to the entire surface of the heating chamber, and 18 is a finder glass of the door.

A case where one embodiment configured as described above is operated as a microwave heating cooker will be described with reference to FIG.

In the case of microwave by the magnetron 12, there is time to measure the weight of food from time A when the heating start button is pressed to time B when power is supplied. During this time, the exhaust fan 10 is energized to 100%, the motor of the exhaust fan 10 is rotated smoothly, and the weight measurement time by the weight sensor 13 is about 10 seconds. Ten seconds later, after power is supplied to the magnetron 12, the exhaust fan 10 is controlled to be turned on and off by the semiconductor 16 (for example, triac) to operate at low speed. If the control method at this time is phase control, the input phase is likely to shift, so the control method is set to one cycle.

During this time, since the amount of water vapor is small and the flow velocity is high, the humidity sensor 11 cannot detect the vapor well, and therefore such an operation is performed. After that, when a certain water vapor detection level is reached, the exhaust fan 10 is fully rotated as shown in C. By setting the electric conductivity to 100%, the finder glass 18 is prevented from being fogged and the steam in the heating chamber 1 is discharged to the outside of the heating chamber 1. After that, the electric conductivity is set to 100% until D at the end of cooking. After cooking, remove the vapor around the humidity sensor 11 so that normal cooking can be detected even after repeated cooking.

That is, in order to detect steam most efficiently, the exhaust fan 10 is fully rotated for a moment just before heating to smoothen the rotation of the motor, and then when the heating is started, the duty ratio of the exhaust fan 10 is set to 40%. %, And if the amount of steam increases so that the finder glass 18 of the door is not clouded by steam, 100% electricity is turned on.

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

In the case of microwave by the magnetron 12, there is time to measure the weight of food from the time A when the heating start button is pressed to the time B when power is supplied. During this time, the exhaust fan 10 is energized to 100%, the motor of the exhaust fan 10 is rotated smoothly, and the weight measurement time by the weight sensor 13 is about 10 seconds. Ten seconds later, after power is supplied to the magnetron 12, the exhaust fan 10 is controlled to be turned on and off by the semiconductor 16 (for example, triac) to operate at low speed.

If the control method at this time is phase control, the input phase is likely to shift, so the control method is set to one cycle unit. As shown in Fig. 4, the duty factor is reduced and the rotation speed is reduced one cycle at a time.

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, and therefore such an operation is performed. Next, after the speed has been reduced to the specified speed, when the amount of water vapor generation begins to become noticeable, the water is rotated at the specified speed until the signal reaches the preset water vapor detection level, as shown at point C. After that, when a certain water vapor detection level is reached, the exhaust fan 10 is fully rotated as shown at point D. By setting the electric conductivity to 100%, the finder glass 18 is prevented from being fogged and the steam in the heating chamber 1 is discharged to the outside of the heating chamber 1. After that, the electric conductivity is set to 100% until the end of cooking E. Even after the cooking is completed, the steam near the humidity sensor 11 is removed for 1 minute until F so that normal detection can be performed even if cooking is repeated immediately.

That is, in order to detect steam most efficiently, the exhaust fan 10 is fully rotated for a moment just before heating to smoothen the rotation of the motor, and then, when heating is started, the duty ratio to the exhaust fan 10 is set to 40%. %, The rotation is gradually decreased until the generation of water vapor becomes remarkable, and 100% electricity is supplied when the amount of steam becomes large so that the finder glass 18 of the door is not fogged by the steam.

By doing so, in both of the above-described two embodiments, it is possible to prevent water droplets from dripping from the gap between the opening / closing door 17 and the main body. In addition, the problem of defective rotation of the motor of the exhaust fan 10 that occurs when the cooker body feels cold is eliminated. In order to effectively operate the oxidation catalyst 9 even when the grill is heated, microwave heating and the duty ratio of the exhaust fan 10 are controlled to purify the exhaust gas.

[0024]

[Effect of the device]

 As described above, according to the present invention, the heating energy generating means, the exhaust fan and the humidity sensor in the exhaust air passage leading from the heating chamber to the outside of the heating chamber are provided to detect the steam generated during heating. In the cooker, the control means has a semiconductor for rotating the exhaust fan by on / off control, and immediately after heating setting of the heating energy generating means and before heating starts, the exhaust fan is rotated for a certain period of time at a duty ratio of 100%. After that, the rotation speed is controlled to a predetermined low speed, so uneven rotation at the time of starting during microwave cooking is prevented, and when full-scale water vapor is generated, the humidity sensor has a good sensitivity to the water vapor flow rate and the response of the humidity sensor is improved. It also improves the deodorization efficiency of grill cooking.

[Brief description of drawings]

FIG. 1 is a side sectional view of a heating cooker showing an 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 duct 10 Exhaust fan 11 Humidity sensor 12 Magnetron (heating energy generating means) 15 Control circuit 16 Semiconductor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akihiro Nakagawa 1-3, Shinjuyoji, Kashiwa-shi, Chiba 1

Claims (4)

[Scope of utility model registration request] 1. A heating energy generating means in a heating chamber (1) (for example, a magnetron (12) for supplying microwaves 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) are provided in an exhaust air passage (7) that communicates from the inside of the heating chamber (1) to the outside of the heating chamber (1) to generate during heating. In the heating cooker configured to detect the water vapor, 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 operated at a duty ratio of 100%. The control circuit (15), which is rotated to prevent uneven rotation at the time of start-up, is controlled to have a predetermined low-speed rotation when a full-scale water vapor is generated so that the humidity sensor (11) has a good flow velocity of water vapor, and heating energy generation means ( 4, 5, 12 ) Or an exhaust fan (10). 2. Immediately after the start of heating setting by the heating energy generating means and before the start of heating, the exhaust fan (10) is rotated at a duty ratio of 100% for a certain period of time and then decelerated to a predetermined low speed rotation for a certain period of time. The cooking device according to claim 1, wherein the cooking device is rotated. 3. Immediately after starting heating setting by the heating energy generating means and before starting to generate steam from the object to be heated, the exhaust fan (10) is gradually rotated from 100% full rotation to a predetermined low speed rotation. The cooking device according to claim 1, wherein the cooking device is rotated for a certain period of time. 4. A semiconductor (thyristor, triac, etc.) (16) is provided in the control circuit (15), and the exhaust fan (10) is rotated by on / off control by the semiconductor (16). Cooker.