JPH0126962Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a microwave oven configured to be applicable not only to heat treatment for cooking purposes but also to drying treatment of foods and tableware.

[Conventional technology]

As described in Japanese Utility Model Application Publication No. 53-115444, conventional microwave ovens are equipped with a microwave oven function and an electric oven function, and are capable of heating various dishes.

[Problems to be solved by the invention] Conventional microwave ovens cannot be used to dry food and tableware.

In other words, when operating as a microwave oven, although it is possible to heat and evaporate water, the amount of water present in vegetables and washed tableware is small, resulting in a so-called underload, making it difficult to obtain an efficient drying effect. Moreover, there is a risk of overheating or electric discharge in the cooking chamber.

In addition, when operating as an electric oven, not only does the cooking chamber reach a high temperature of 140℃ to 250℃,
Due to poor air circulation within the cooking chamber, a satisfactory drying treatment effect cannot be obtained.

The present invention takes the above points into consideration and circulates hot air within the cooking chamber, extremely efficiently and safely.
To provide a microwave oven capable of cooking dried fish and drying tableware.

[Means to solve the problem]

In order to achieve the above object, the microwave oven of the present invention includes a cooking chamber in an outer box in which food to be cooked or food to be dried is stored, a magnetron that supplies high frequency waves to the cooking chamber during high frequency heating, and an oven. Circulating means for circulating hot air from a heating element into the cooking chamber during heating and drying, a blower for cooling the magnetron, and a duct for air that cools the magnetron are rotatably provided, and the air circulating means for circulating the hot air from the heating element during high frequency heating into the cooking chamber through the intake port of the cooking chamber; at position b, where the air is guided outside the outer box during oven heating; and during drying, a portion of the air is guided into the cooking chamber through the intake port. a switching damper that is respectively switched to position c to guide the remaining portion to the outside of the outer box; an exhaust port formed in the cooking chamber; and a control device that controls the drive of the heating element during drying to lower the temperature inside the cooking chamber from that during oven heating. The apparatus is characterized in that it includes a holding means such as a thermostat that maintains the drying temperature at a low drying temperature.

[Effect]

In the microwave oven configured as described above, during high frequency heating, that is, when operating as a microwave oven, high frequency waves from the magnetron are supplied into the cooking chamber to heat the food to be cooked. Since the magnetron is switched to position a, cooling air from the magnetron is guided into the cooking chamber through the intake port, and steam generated from the food to be cooked is discharged from the exhaust port together with this cooling air.

In addition, when heating the oven, the switching damper is switched to position b, so the cooling air from the magnetron is not introduced into the cooking chamber, and the hot air from the heating element is circulated within the cooking chamber by the circulation means. The temperature becomes high and the food to be cooked is efficiently heated in the oven.

Furthermore, during drying, hot air is circulated in the cooking chamber by the circulation means, while the drying temperature in the cooking chamber is maintained at a lower drying temperature than when heating the oven by the holding means, so that the items to be dried in the cooking chamber are heated appropriately. At this time, the switching damper is switched to the c position and the magnetron's cooling air is introduced into the cooking chamber, so the steam generated from the drying material is actively released from the exhaust port as the air is introduced. In addition, only a portion of this cooling air is introduced into the cooking chamber, which prevents the temperature of the cooking chamber from dropping excessively, resulting in efficient drying.

〔Example〕

Examples will be described with reference to FIGS. 1 and 2.

A magnetron 3 is provided in the space between the side plate of the outer box 1 and the side plate of the inner box 2 for defining the cooking chamber, and the magnetron 3 penetrates the side plate of the inner box 2 and projects into the cooking chamber 4. It has a microwave radiating section 5.

A blower 6 installed adjacent to the magnetron 3
is for sending out cooling air,
This cooling air passes through the heat dissipation section of the magnetron 3, travels inside the duct 7, and reaches the switching damper 8.

The switching damper 8 is connected to the support shaft 9 by an external operation.
Rotate using the fulcrum as a fulcrum. The air that has cooled the magnetron 3 is guided into the cooking chamber 4 when the damper 8 is set to the a position, and is discharged outside the oven through the exhaust port 10 of the outer box 1 when the damper 8 is set to the b position. be done.

Further, when the damper 8 is set at the c position between the a position and the b position, a part of the air is guided into the cooking chamber 4, and the remaining part is discharged out of the range through the exhaust port 10.

A circulation fan 12 and a heating element 13 that are rotationally driven by a motor 11 are provided in the ventilation path between the top plate of the outer box 1 and the top plate of the inner box 2. fits into the vent 14 of the top plate of the inner box 2, and the exhaust part of the heating element 13 fits into the vent 15 of the top plate of the inner box.

Note that the fan 12 is connected to the rotating part of the blower 6 with a belt or the like, and the fan 1 is driven by the rotational power of the blower motor.
2, the motor 11 is not required.

The heating element 13 is housed in a heat-resistant cylindrical body 16 made of ceramic or the like, and heats the air sucked up from inside the cooking chamber 4 by the fan 12. The heating element 13 and the fan 12 constitute a circulation means. has been done.

At the bottom of the cooking chamber 4, a turntable 18 that rotates at low speed with the rotational power of a motor 17 is provided. It serves as a breathable tray for the dry matter 20.

An exhaust port 21 is provided on the other side plate of the inner box 2, and the air that has passed through the exhaust port 21 is discharged outside the range through the exhaust port 22 of the outer box 1.
The opening/closing damper 23 provided at the exhaust port 21 is rotated about a support shaft 24 by an external operation.

When the fan 12 is rotated and the heating element 13 is energized, hot air circulates in the cooking chamber 4 along the path shown by solid arrows in FIG. The temperature in the cooking chamber 4 is maintained at a predetermined value by controlling the opening and closing of the heating power supply path by a liquid expansion type or other type of thermostat 25 provided on the side plate of the inner box 2. Reference numeral 26 indicates an intake port formed in the outer box 1, and 27 indicates an intake port formed in the inner box 2.

Next, if you want to operate it as a microwave oven,
The stand 19 is removed, the switching damper 8 is set to the a position, and the opening/closing damper 23 is set to the open state. Therefore, the air sent from the blower 6 enters the cooking chamber 4 after cooling the magnetron 3, and the steam generated from the food being cooked is transferred to the exhaust port 2 of the inner box 2.
1 and the exhaust port 22 of the outer box 1 to the outside of the range.

In addition, when operating as an electric oven, set the switching damper 8 to position b and open/close damper 23.
keep closed. In this case, the air in the cooking chamber 4 sucked up by the fan 12 is
3 and then returned to the cooking chamber 4. Then, the cycle of being sucked up and heated again is repeated, and high-temperature heating treatment using hot air is achieved here. Further, the air after cooling the magnetron 3 cools the top plate portion of the outer box 1 and is discharged from the exhaust port 10 to the outside of the range.

Next, when this microwave oven is used as a dryer, the stand 18 and the object to be dried 20 are placed on the turntable 18, the switching damper 8 is set at position c, and the opening/closing damper 23 is kept open. For this reason, the air is sent out from the blower 6 and the magnetron 3
A part of the cooled air enters the cooking chamber 4, and the remainder cools the top plate of the outer box 1 and is discharged from the exhaust port 10 to the outside of the range. Inside the cooking chamber 4, hot air circulates along the path indicated by the solid arrow, but since the temperature set by the thermostat 25 is set to a lower drying temperature than the temperature set when the electric oven is operating, the hot air inside the cooking chamber 4 is maintained at a temperature of approximately 80°C to 100°C. Since the steam generated from the object to be dried 20 is discharged outside the oven through the exhaust ports 21 and 22, the object to be dried 20 can be dried extremely efficiently and safely.

[Effect of idea]

Since the present invention is configured as described above, it produces the effects described below.

By circulating the hot air in the cooking chamber by the circulation means and controlling the drive of the heating element by the holding means, the drying temperature is maintained at a lower temperature than when heating the oven, while cooling air from the high-frequency heating magnetron is introduced into the cooking chamber. It is possible to actively dry the material to be dried by appropriately heating the material to be dried indoors and actively discharging the evaporated moisture. It can be equipped with a drying function for drying, and when drying, only a portion of the cooling air is guided into the cooking chamber by switching the switching damper, so the temperature inside the cooking chamber is extremely low. Therefore, it is possible to realize an efficient drying process.

[Brief explanation of the drawing]

The drawings show one embodiment of the microwave oven of the present invention, with FIG. 1 being an external perspective view and FIG. 2 being a sectional view. 1... Outer box, 2... Inner box, 3... Magnetron, 4... Cooking chamber, 6... Blower, 7... Duct, 8... Switching damper, 12... Fan, 13...
...Heating element, 21, 22...Exhaust port, 23...Opening/closing damper, 25...Thermostat, 26, 27...
...Intake port.

Claims (1)

[Scope of utility model registration request] A cooking chamber inside the outer box in which the food to be cooked or dried is stored, a magnetron that supplies high frequency waves to the cooking chamber during high frequency heating, and hot air from a heating element that circulates into the cooking chamber during oven heating and drying, respectively. a circulation means for cooling the magnetron, a blower for cooling the magnetron, and a position a which is rotatably provided in a duct for cooling the magnetron and guides the air from the intake port of the cooking chamber into the cooking chamber during high-frequency heating. , a switching damper that can be switched to position b, which guides the air outside the outer box during oven heating, and position c, which directs a part of the air from the air intake port into the cooking chamber during drying, and guides the remaining part to the outside of the outer box. and an exhaust port formed in the cooking chamber;
a holding means for controlling the drive of the heating element during drying to maintain the temperature inside the cooking chamber at a drying temperature lower than that during oven heating.