JPH0645061A - High frequency heating device - Google Patents

Abstract

PURPOSE:To shorten cooking time and save consumed power by detecting the humidity in an oven, judging the unnecessariness of air discharging process when the value is lower than a set value, and cutting the drive of a fan. CONSTITUTION:When the menu of 'warmup heating' is selected, a humidity sensor 15 reads a detection value Vs and compares it with a set value. When the oven internal humidity is low, a magnetron 13 is heated at full power by a magnetron driving part 22 without executing air discharging process. When the detection value Vs is a set humidity Vs1 showing menu completion or more, the magnetron 13 is OFF, and 'warmup heating' is completed. When the oven internal humidity requires the air discharging process, the magnetron 13 is not ON, and after air discharging is conducted for 15 seconds by a fan 12, full-power heating is conducted by the magnetron 13. After reaching sufficient heating state, the detection value Vs of the sensor 15 is reset to the set value. Steam generating level is detected to judge the completion, and the magnetron 13 is OFF.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high frequency heating device having a humidity sensor.

[0002]

2. Description of the Related Art Generally, in a high-frequency heating device such as a microwave oven equipped with a humidity sensor, for example, when "warming" heating of the auto menu key is selected, a predetermined heating amount automatically set (usually When the magnetron is driven with full power) to perform heating, and the progress of the heating state causes vapor to be generated from the object to be heated,
A heating control system is used in which the humidity sensor detects the amount of steam generated, and when the detected level exceeds a predetermined set level, it is determined that "warming" is completed and the heating operation of the magnetron is stopped.

Therefore, in the system, when detecting the humidity during the continuous heating, it should be taken into consideration whether or not the continuous heating is actually performed, and the actual humidity value, in consideration of not causing erroneous detection due to the residual humidity at the previous heating. Is high or low,
When a heating control menu with a humidity sensor such as the above-mentioned "auto-warm" is selected, the fan inside is always driven for a certain time (generally about 15 seconds) before driving the magnetron, As a result, an exhaust process is incorporated to adjust the humidity of the inside air to a zero level (external air level).

[0004]

However, when continuous heating is not actually performed, the humidity of the air in the cold storage is low, and the above-described exhaust step is essentially unnecessary.

Therefore, even if the exhaust time for uniformly rotating the fan motor is set in such a case, not only the power consumption is unnecessarily increased, but also the entire cooking time is unnecessarily lengthened.

[0006]

SUMMARY OF THE INVENTION The present invention has been made for the purpose of solving the above problems, and predicts heating means for heating an object to be heated by microwave output and heating output of the heating means. For setting the heating output, the heating output control means for controlling the output of the heating means according to the cooking process so that the heating output set by the heating output setting means is obtained, and the humidity in the heating chamber is detected. A humidity sensor, a heating stop control means for stopping the heating operation of the heating means when the detected value exceeds a predetermined set value, and a heating operation by the heating means. In a high-frequency heating device comprising an exhaust control means for driving an exhaust fan within a predetermined time to exhaust the air inside the storage chamber, the humidity sensor prioritizes the operation of the exhaust control means. Detecting the humidity of the inner, when the detected humidity is less than a predetermined set value is characterized in the provision of the exhaust control cutting means to cut the operation control of the exhaust control unit.

[0007]

The high-frequency heating device of the present invention is constructed as described above.

Therefore, prior to the above-mentioned operation of the exhaust control means for driving the exhaust fan within a predetermined time to exhaust the air in the refrigerator prior to the heating operation by the heating means, the operation is further prioritized. First, the humidity sensor detects the humidity in the refrigerator. Then, when it is recognized that the detected humidity in the refrigerator is equal to or less than a predetermined set value and the exhaust process is unnecessary,
The exhaust control cut means acts to cut the drive control of the fan by the exhaust control means.

[0009]

As a result, according to the high frequency heating apparatus of the present invention, the unnecessary exhausting step as in the prior art can be eliminated, the entire cooking time can be shortened by that much, and the fan motor can be unnecessarily rotated. It also saves power consumption.

[0010]

1 to 4 show the structure of a high-frequency heating apparatus (microwave oven) equipped with a humidity sensor according to an embodiment of the present invention.

First, FIG. 1 shows the overall structure (housing structure) of the high-frequency heating apparatus 1, in which a heating chamber (cook storage) 2 is provided inside the housing 1a. A turntable 3 for placing a food item is rotatably installed on the bottom of the heating chamber 2. A door 16 having a finder portion 17 is attached to the front opening 19 of the heating chamber 2 so as to be vertically openable and closable.
A door switch 18 is provided on the side of the main body corresponding to the door 16.

On the other hand, the door 16 on the front side of the housing 1a
Operates various functions of the high-frequency heating device on the right side of
An operation panel unit 26 for controlling is installed. As shown in detail in FIG. 2, for example, on the operation panel unit 26, a display unit (fluorescent display unit) 34, a heating time setting key for manual menu (5 minutes, (1 minute, 10 seconds consisting of 3 keys) 27, start key 28a, cancel key 28b, manual heating key
(It consists of 5 keys: range strong / weak, raw thawing, toaster, pizza heating) 29, automatic heating key (6 keys: warm, milk warm, sake can, toast, frozen toast, cooked rice) 30 , Finish adjustment key (finish,
37, which has two functions for adjusting the color of the burnt color, and is composed of two keys, a strengthening key and a weakening key, and a time setting key 38 are appropriately arranged with good operability.

When the above-mentioned various operation keys on the lower side are turned on, for example, various selection setting states are displayed on the display unit 34 as shown in FIG.
(FIG. 2 shows a state in which all operation information is displayed).

The operation panel section 26 is connected to a control unit 20 for controlling a microwave oven, which is mainly composed of a microcomputer as shown in FIG. It can be sent and received.

Further, as is clear from FIG. 3, the object to be heated on the cooking plate 5 placed on the turntable 3 in the heating chamber 2 (inside the housing 1a of the high-frequency heating device 1). (In this example, for example, curry that requires warming)
Magnetron 13 that heats up by radiating and absorbing microwaves in 40, heater 36 and heater circuit 35 that heats up the object to be heated in the heating chamber 2 by irradiating infrared rays if necessary, and fan 12a for ventilation. The fan motor 12 and the fan motor 12 are installed as illustrated. A turntable motor drive circuit 24 is provided between the control unit 20 and the turntable motor 4.
However, a fan motor drive circuit 25 is provided between the control unit 20 and the fan motor 12, and a magnetron drive unit 22 is provided between the control unit 20 and the magnetron 13. The turntable motor 4 is provided with a weight sensor 36, and the detection value K detected by the weight sensor 36 is the amount of food (weight).
It is used to judge. Further, reference numeral 37 is a power supply circuit, which supplies the power supply voltage from the AC power supply 100 (V) to the magnetron drive unit 22, the turntable motor drive circuit 24,
It is distributed and supplied to the fan motor drive circuit 25.

While the fan 12a is used for ventilation in a simmered state, it is also used for exhausting humidity inside the chamber before execution of heating during automatic "warming" continuous heating, for example.

On the other hand, as shown in the figure, an outside air introduction port 8 is formed on one side wall 31 side of the housing 1a, and an exhaust port 11 is formed on the other side wall 32 side, and the heating chamber 2 between them is formed. Ventilation openings 9 and 10 are formed in both side walls 6 and 7, respectively. The above-described fan 12a driven by the fan motor 12 is interposed between the outside air introduction port 8 and the ventilation port 9, and the outside air introduced through the outside air introduction port 8 is indicated by an arrow in the figure. As shown in the figure, after the magnetron 13 is first cooled, the odor and steam during cooking are absorbed through the upper part of the heating chamber 2 and discharged from the exhaust port 11 side. The ventilation port 10 and the exhaust port 11
While being formed in the duct portion 14, a humidity sensor 15 is installed in the middle of the passage of the duct portion 14 so as to face the inside of the passage and detect the humidity during heating, boiling, and heat retention. There is. Then, the output signal V of the humidity sensor 15
s is input to the control unit 20 via a predetermined detection unit 23 and stored in the memory. Further, reference numeral 38 is a pyroelectric infrared sensor, which detects the temperature inside the refrigerator.

In the control unit 20, for example, during automatic "warming" cooking, the amount of steam emitted from the object 40 to be heated by the humidity sensor 15 is a predetermined set value Vs _1.
When the above is detected, the magnetron drive unit 22 is turned off to stop the drive of the magnetron 13. On the other hand, when it is detected that the object to be heated is in a boiling state in the case of the automatic “simmering menu” or the like, the heating output of the magnetron 13 in the subsequent simmering step is automatically adjusted according to the level, for example, automatically. Is adjusted to achieve an appropriate simmering and heating state that prevents spillage, while the heat retention output is set according to the output of the weight sensor 36 according to the detected humidity in the heat retention state after completion of cooking, if necessary. Is controlled more finely.

Next, details of the exhaust control at the time of automatic "warming" by the control unit 20 of the present embodiment will be described in detail with reference to the flowchart of FIG.

That is, first, when the "heat to heat" operation key 30, which is an auto menu key, is turned on and the start key 28a is turned on, the "warm up" control is started, and then step S ₁ , S ₂ and S ₃ sequentially,
Interior lamp, turntable motor 4, fan motor 1
2 is turned on to form the apparent "warming" cooking execution state.

Then, in step S ₄ , is it the first time that the current "heated heating" menu has been selected,
Alternatively, it is determined whether or not it is due to two or more consecutive selection operations consecutive from the previous time.

As a result, at the time of continuous "warming" in which it is determined that the humidity in the storage is expected to be high, it is judged as NO,
Further proceeding to step S ₅ , the detected value Vs of the humidity sensor 15 is read, and in the following step S _6, it is compared with the zero adjustment value Vo of the previous humidity sensor output, and the detected value Vs is Vo ± 0.1.
It is judged whether it is within the range of (V).
(V) is arbitrarily determined by the output order of the humidity sensor 15.

When the determination result is YES and the inside humidity is low to the extent that the exhaust process is not required, the process proceeds to step S _7, and the exhaust process of steps S ₃ and S ₁₀ is not executed immediately. The magnetron drive unit 22 is turned on to drive the magnetron 13 to perform full-power range heating.

Thereafter, the detection value Vs of the humidity sensor 15 is further read, and the read value Vs is "heated to warm".
When it became a in the set humidity Vs ₁ or more indicating completion is confirmed at step S ₈ that follow, the magnetron driving unit 22 by OFF operation in step S ₉ to OFF output of the magnetron 13 (warmed complete heating ).

On the other hand, when the indoor humidity is determined to be NO in the above step S ₆ and is high enough to require the exhaust process (when Vs ± 0.1 (V) is exceeded), the magnetron 13 is used. the by the driving state of the fan motor 12 at step S ₃ and continued for at least 15 seconds without having to oN performs exhaust in the refrigerator, the course of the 15 seconds is confirmed in step S _10, the first step S Proceed to ₁₁ to turn on the magnetron drive unit 22 to turn on the magnetron 1
3. Start full power heating according to 3.

After that, the process further proceeds to step S ₁₂ and 10 seconds after the heating by the magnetron 13 is started.
(This 10 seconds is the time to wait for a sufficient heating condition to make the humidity detection condition during zero adjustment the same as the detection of the set humidity V ₃₁ during the heating stop control) It is determined whether or not, and when 10 seconds have passed, step S ₁₃
Then, the detection value Vs of the humidity sensor 15 is set to zero level (V
s = Vo ± 0.1V).

Then, after that, the above-mentioned steps S ₈ and S _{9 are performed.}
Then, the steam generation level of the object to be heated is watched to detect the completion (Vs ≧ Vs ₁ ) of “warming”, and when the completion is detected, the magnetron 13 and the like are turned off to complete the control.

As described above, in the configuration of the present embodiment, when the auto menu "warm heating" is executed, the internal humidity is specifically determined, and the exhaust time (15 Seconds) is not set.

Therefore, unlike the conventional one in which the exhaust process is always performed at the time of "warming", an unnecessary long cooking time is not required and power consumption is saved.

Further, in the above embodiment, if the magnetron output set value is set to the high power system, the cooking time can be further shortened.

In the above embodiment, the case of "warming" as the selection menu has been described as an example, but the same problem as this is common to all menus using the output of the humidity sensor for heating control. Needless to say, the present invention can be similarly applied to all of them.

[Brief description of drawings]

FIG. 1 is a perspective view showing a housing structure of a high frequency heating apparatus according to an embodiment of the present invention.

FIG. 2 is an enlarged front view showing a structure of an operation panel section of the same device.

FIG. 3 is a block diagram mainly showing a configuration of a control circuit unit of the device.

FIG. 4 is a flow chart showing a control operation during “warming” cooking by the control unit of the apparatus.

[Explanation of symbols]

1a is a housing part, 2 is a heating chamber, 3 is a turntable, 5 is a cooking plate, 13 is a magnetron, 15 is a humidity sensor, 20
Is a control unit, 22 is a magnetron drive unit, and 36 is a weight sensor.

Claims (1)

[Claims] 1. A heating means for heating an object to be heated by a microwave output, a heating output setting means for preliminarily setting the heating output of the heating means, and a heating output set by the heating output setting means are obtained. As described above, the heating output control means for controlling the output of the heating means according to the cooking process, the humidity sensor for detecting the humidity in the heating chamber, and the detection value of the humidity sensor, the detected value is a predetermined set value. A heating stop control means for stopping the heating operation of the heating means when the above is reached, and an exhaust control means for driving the exhaust fan within a predetermined time to exhaust the air inside the warehouse prior to the heating operation by the heating means. In a high-frequency heating device comprising: an exhaust control means, the humidity sensor detects the humidity inside the chamber prior to the operation of the exhaust control means, and when the detected humidity is less than or equal to a predetermined set value, the exhaust control hand A high-frequency heating device, characterized in that exhaust control cutting means for cutting the step operation control is provided.