JPH0650542A - High frequency heating and cooking device - Google Patents

Abstract

PURPOSE:To enable an air pressure at a suction port to be easily adjusted by a method wherein the length of a passage from a vapor sensor is set such that the passage at a suction port side is elongated more as compared with the length of a discharging port. CONSTITUTION:A distance L0 got from a vapor sensor 5 is made shorter at an air discharging port 8 than that of the prior art and a distance Li from the vapor sensor 5 is in turn elongated at a suction port 7 side than that of the prior art. Due to this arrangement, an air flow entering at the suction port 7 is not concentrated at the vapor sensor 5, but an air pressure taken into the suction port 7 can be easily adjusted in response to a size of an opening area of the suction port 7. With such an arrangement, the most suitable air taking volume can be assured without being influenced by a pressure of air entering into the suction port of the vapor sensor 5.

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 cooker for automatically detecting the heating state of an object to be heated.

[0002]

2. Description of the Related Art Conventionally, in a high-frequency heating cooker that automatically detects a heating state of an object to be heated and performs automatic heating,
A vapor detection method using the pyroelectric effect is used as the detection method. In this method, in order to increase the detection sensitivity, the vapor detector is provided with an inlet (hereinafter referred to as an inlet) for taking in part of the air from the cooling device for cooling the high frequency generator so that the temperature of the vapor detector does not become high. It guides the air to and suppresses excessive temperature rise. Due to the configuration of the cooling device for safe operation of the high frequency generator, problems such as where the steam detector is configured and the pressure of the air entering the suction port of the steam detector change, and the optimum cooling of the steam detector is maintained. It was not easy and there were many issues.

A conventional example will be described below with reference to FIG. As shown in the figure, the object to be heated 2 (food) placed on the plate holder 13 inside the heating chamber 1 is induction-heated by the microwave generated by the magnetron 11 (high frequency generator) by the drive circuit 12, As the temperature of the heated object 2 rises, the water contained in the heated object 2 evaporates and applies steam from the steam intake port 3 to the steam detector 5 through the steam guide 4.
The vapor detector 5 converts the thermal energy of the vapor into an electric signal by the pyroelectric effect, and determines the vapor detection based on the level of the electric signal. The steam detector 5 using such a pyroelectric effect converts a temperature change into a voltage, and when the temperature of the steam detector 5 itself rises, a temperature change with the steam from the object to be heated 2 cannot be obtained and the voltage change. The level drops. The upper heater 14 on the upper surface of the heating chamber 1 and the lower heater 15 on the lower surface of the heating chamber 1 in FIG. 4 are for performing electric heating cooking of the object 2 to be heated. The temperature of the steam detector 5 itself is increased by the hot air from the inside, and the sensitivity to the heat energy of the steam from the object to be heated 2 due to the induction heating of microwaves is lowered, which hinders normal finish detection. In order to cope with the temperature rise of the steam detector 5, the steam detector 5 is arranged close to the cooling device 10 (fan motor) that cools electric parts such as the magnetron 11, and the surface of the steam detector 5 on which the steam hits. The air from the fan motor is applied to the opposite side of the
On the surface of the steam detector 5 to which steam is applied, air is taken in from the fan motor through the air intake 7 (intake), and the temperature of the steam detector 5 is lowered to prevent a signal drop. .

[0004]

However, in the conventional configuration, the pressure of the air entering the intake port 7 of the vapor detector 5 is greatly influenced by the arrangement of the cooling device 10, the drive circuit 12, the magnetron 11 and the like. Ensuring optimum air intake was not easy.

Therefore, it is a first object of the present invention to provide a structure in which the pressure of the air at the suction port of the vapor detector can be easily adjusted even if the pressure of the air changes depending on the component structure of each part.

A second object is to construct a steam detector which can be arranged in a space-saving manner, and steam or smoke generated in the heating chamber due to electrothermal cooking or the like is discharged from the suction port of the steam detector to electric parts or the like. It is to provide a configuration in which dew condensation does not occur.

A third object is to provide a structure for ensuring detection sensitivity even when the temperature of air for cooling the vapor detector is high.

A fourth object is to provide a structure for shortening the time required for the vapor from the object to be heated to reach the vapor detector.

A fifth object is to provide a structure in which a fixed amount of water droplets generated from the mixer is stored and does not immediately drop on the floor surface.

[0010]

In order to achieve the above-mentioned object, the present invention has the following construction for the high-frequency heating cooker of the present invention.

That is, in order to achieve the first object, a heating chamber for storing food in a main body for heating and cooking, a high-frequency generator connected to the heating chamber, and a cooling device for cooling the high-frequency generator. A steam detector for detecting steam generated from the food in the heating chamber; a steam guide for guiding the steam from a part of the heating chamber to the steam detector; and a mounting base for fixing the steam detector. A mixer having an inlet for taking in air for cooling the vapor detector and an exhaust outlet for exhausting the vapor detector, wherein the length of the passage from the vapor detector is closer to the inlet than the length of the passage of the outlet. It was configured to lengthen the passage.

In order to achieve the second object, the mounting direction of the vapor detector is set to a direction having a vertical inclination, and the upper part of the opening of the intake port and the exhaust port is higher at the exhaust port. It was configured.

In order to achieve the third object, the air passages of the suction port and the vapor detector are provided with undulations.

Further, in order to achieve the fourth object, the air from the cooling device is discharged adjacent to the exhaust port of the vapor detector.

Further, in order to achieve the fifth object, a water receiver for accumulating a fixed amount of water droplets generated from the mixer on the mounting table is adopted.

[0016]

The present invention has the following functions due to the above construction.

That is, in the first configuration, the distance from the vapor detector 5 is made shorter on the exhaust port 8 side than before, and conversely, the distance from the vapor detector 5 is made longer on the intake port 7 side than before. Since the configuration is adopted, the flow of air entering from the intake port 7 is not concentrated on the vapor detector 5, and the wind pressure taken from the intake port 7 can be easily adjusted depending on the size of the opening area of the intake port 7.

In the second construction, the vapor detector 5 is arranged vertically instead of horizontally as in the conventional case, so that it can be arranged in a small space. Further, since the exhaust port 8 is higher than the intake port 7, the generated steam and smoke are prevented from flowing back from the intake port 7.

Further, in the third configuration, since the passage between the vapor detector 5 and the suction port 7 is provided with undulations, the flow of air for cooling the vapor detector 5 is disturbed, and the vapor is detected by the vapor detector 5. At the time of hitting, since the contact is disturbed by the turbulent flow, the temperature change of the steam detector 5 becomes large and the signal level increases.

Further, in the fourth structure, the air for cooling the back surface of the vapor detector 5 is quickly discharged toward the exhaust port 8, so that a negative pressure is generated at the exhaust port 8 and hits the vapor detector 5. The steam or the like is drawn into the exhaust port 8 to accelerate the flow of the steam.

Further, in the fifth structure, since the structure for storing water drops is provided on the mounting base 9 of the vapor detector 5, the water drops are prevented from falling on the floor surface.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A high frequency heating cooker according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view of the main part of the high-frequency heating cooker having the structure of the present invention as seen from above. As shown in FIG. 1, the object to be heated 2 (food) placed on the tray support 13 inside the heating chamber 1 is the magnetron 11 and the drive circuit 12.
By the radio wave heating, the moisture contained in the object to be heated 2 evaporates as the temperature of the object to be heated 2 rises. This steam is guided from the steam intake port 3 to the steam detector 5 through the steam guide 4. The temperature of the steam detector 5 changes due to this steam. This change is converted into an electrical signal. If the temperature rise of the vapor detector 5 itself becomes high, the temperature difference becomes small, so that the change of the electric signal becomes small. Cooling device 1 to prevent this
Cooling air is applied to the back surface of the steam detector 5 from the fan motor of 0, and the cooling air is also taken into the front surface of the steam detector 5 where the steam hits from the suction port 7 to prevent an excessive temperature rise. FIG. 2 is a sectional view of the vapor detector 5 and the mounting base 9 of the present invention when viewed from above. FIG. 3 shows a sectional view of the side surface. By setting the length from the center of the vapor detector 5 to the suction port 7 to be Li and the length to the exhaust port 8 to be Lo <Li, the cooling air entering from the suction port 7 as shown in FIG. Since the distance between the suction port 7 and the vapor detector 5 is long, the cooling air may spread and concentrate on a part when the cooling wind reaches the vapor detector 5 even if the position of the suction port 7 is downward. Disappear. Therefore, even if the arrangement of the cooling device 10, the drive circuit 12, the magnetron 10, etc., the cooling configuration, etc. change, the opening area (length A) of the suction port 7 of the steam detector 5 is adjusted to adjust the steam detector 5. Since the temperature can be adjusted, the optimum sensitivity can be easily set. Further, by shortening the length Lo of the exhaust port, the exhaust resistance from the steam guide 4 to the exhaust port 8 can be reduced, and the flow of steam can be increased. Further, the overall length (Lo + Li) of the configuration can be configured to be approximately the same as the conventional overall length.

Further, since the height Hi of the suction port 7 can be set to have a relation of Ho> Hi as compared with the height Ho of the exhaust port 8, steam and smoke generated during electric heating cooking in which the fan motor is stopped are discharged from the suction port 7. Backflow can be prevented.

Further, as shown in FIG. 2, when the mounting base 9 of the vapor detector 5 is undulated, a turbulent flow occurs in the cooling air from the suction port 7, and the temperature change of the vapor detector 5 becomes active and the signal level is increased. it can. FIG. 4 is a diagram showing the signal level characteristics when the undulating shape is attached to the mounting base (FIG. 4a) and when the mounting base is not mounted (FIG. 4b). From the figure, it can be seen that the signal level is significantly increased by mounting the undulating shape.

In FIG. 1, the cooling air on the back surface of the steam detector 5 is discharged from the discharge port 16 adjacent to the discharge port 8 at a high speed, so that the discharge port 8 has a negative pressure and the steam in the heating chamber 1 is detected. The device 5 can be reached faster and the detection time can be improved.

As shown in FIGS. 2 and 3, a water receiver 21 is provided below the vapor detector 5, and a drain 18 having a reduced height is provided on a part of a side wall 19 of the water receiver. Water drops 20 generated in the steam detector 5 are stored in a water receiver 21, and when a certain water level is exceeded, the water drops 20 flow from a water drainer 18 to a writer 17 and flow downward.

[0028]

As described above, the following effects can be obtained in the high frequency heating cooker according to the first aspect.

The amount of cooling air of the steam detector 5 can be adjusted by the opening area of the suction port 7, and the cooling structure of the electric parts can be flexibly dealt with, and the burden on the designer can be greatly reduced.

Further, due to the positional relationship in the height direction between the intake port 7 and the exhaust port 8 of the vapor detector 5 of claim 2, the vapor detector 5 can be arranged so as to be inclined vertically, and the space can be effectively used. It became possible to use it, and high-density mounting became possible.

With the undulating structure of the mounting base 9 of claim 3, the sensitivity of the steam detector 5 can be increased, the temperature regulation of the installation place is relaxed, and the degree of freedom in design is improved.

Optimum heating can be realized by shortening the heating time of food by the discharge port 16 of claim 4.

With the water receiver according to the fifth aspect, it is possible to prevent water droplets from falling onto the floor surface, and at the same time, it is possible to take measures against water droplets at low cost.

[Brief description of drawings]

FIG. 1 is a main sectional view of an induction heating cooker according to an embodiment of the present invention as seen from above.

FIG. 2 is a sectional view of the main part of the vapor detector.

FIG. 3 is a side sectional view of a main part of the vapor detector.

FIG. 4A is a characteristic diagram showing a signal level of the vapor detector, and FIG. 4B is a characteristic diagram showing a signal level of a conventional vapor detector.

FIG. 5 is a side sectional view of a main part of a conventional high-frequency heating cooker.

[Explanation of symbols]

 1 Heating Chamber 2 Object to be Heated (Food) 4 Steam Guide 5 Steam Detector 6 Mixer 7 Suction Port 8 Exhaust Port 9 Mounting Stand 10 Cooling Device 11 High Frequency Generator 21 Water Receiver

Claims (5)

[Claims] 1. A heating chamber for housing an object to be heated in a main body for cooking, and a high frequency generator connected to the heating chamber,
A cooling device that cools the high-frequency generator, a steam detector that detects steam generated from food in the heating chamber, a steam guide that guides the steam from a part of the heating chamber to the steam detector, and the steam. A mounting base for fixing the detector is provided with a mixer having an intake port for taking in air for cooling the vapor detector and an exhaust port for exhausting the vapor detector, and a length of a passage from the vapor detector is set as an exhaust port. Compared to this, a high-frequency cooker with a longer passage on the suction port side. 2. A heating chamber for storing food in a main body for heating and cooking, a high-frequency generator connected to the heating chamber, a cooling device for cooling the high-frequency generator, and a food generated in the heating chamber. A steam detector for detecting the steam, a steam guide for guiding the steam from a part of the heating chamber to the steam detector, and an air for cooling the steam detector in a mount for fixing the steam detector. A mixer having an intake port and an exhaust port for exhausting the vapor detector, and the vapor detector is installed in a direction in which the vapor detector has an inclination in a vertical direction, and an upper portion of the opening of the intake port and the exhaust port. But,
A high-frequency cooker with a high exhaust port. 3. A heating chamber for storing food in a main body for heating and cooking, a high-frequency generator connected to the heating chamber, a cooling device for cooling the high-frequency generator, and a food generated in the heating chamber. A steam detector for detecting the steam, a steam guide for guiding the steam from a part of the heating chamber to the steam detector, and an air for cooling the steam detector in a mount for fixing the steam detector. A high-frequency heating cooker comprising: a mixer having an intake port and an exhaust port for exhausting air, and undulating an air passage of the intake port and the vapor detector. 4. A heating chamber for storing food in a main body for heating and cooking, a high-frequency generator connected to the heating chamber, a cooling device for cooling the high-frequency generator, and a food generated in the heating chamber. A steam detector for detecting the steam, a steam guide for guiding the steam from a part of the heating chamber to the steam detector, and an air for cooling the steam detector in a mount for fixing the steam detector. A high-frequency heating cooker comprising: a mixer having an intake port and an exhaust port for exhausting the air, and configured to discharge air from the cooling device adjacent to the exhaust port of the vapor detector. 5. A heating chamber for storing food in a main body for heating and cooking, a high-frequency generator connected to the heating chamber, a cooling device for cooling the high-frequency generator, and a food generated in the heating chamber. A steam detector for detecting the steam, a steam guide for guiding the steam from a part of the heating chamber to the steam detector, and an air for cooling the steam detector in a mount for fixing the steam detector. A high-frequency cooker comprising a mixer having an inlet and an exhaust port for exhausting, and a water receiver for storing a fixed amount of water droplets generated from the mixer on the mounting table.