JPS6028886Y2 - High frequency heating device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a high frequency heating device.

Generally, a high-frequency heating device is provided with a cooling fan to cool electrical components such as a magnetron that is a high-frequency oscillation source and a high-voltage transformer that supplies high voltage to the magnetron.

In addition, in high-frequency heating devices that have an exhaust temperature detection function, the heating of the food inside the oven is indirectly controlled by the temperature of the exhaust air from inside the oven, so the temperature of the air introduced into the oven must remain constant throughout the heating process. Conventionally, high-frequency heating devices have been devised as shown in FIG. 1, an explanatory internal side view, and FIG. 2, a partially cutaway top view of the same.

In Figures 1 and 2, 1 is an oven, 2 is a door attached to the front of the oven so that it can be opened and closed, 3 is a chassis,
4 is the rear cabinet.

Further, 5 is a magnetron, which is connected to the oven 1 through a waveguide 6.
is combined with

24 is a high voltage transformer that supplies high voltage to the magnetron, and is screwed to the chassis 3.

Reference numeral 7 denotes a turntable provided in the oven 1, the rotating shaft of which is directly connected to a pulley 8, and connected to a speed reducer 9 through a belt 0.

Further, the speed reducer 9 is connected to a motor 11 by a belt 12, and a propeller fan 13 is attached to the other shaft of the motor 11.

Reference numeral 14 denotes an exhaust duct provided on the upper surface of the oven, and a thermistor 15 is disposed in order to detect the temperature of exhaust gas from inside the oven 1.

Next, we will explain the flow of air. When heating starts, the motor 11 starts, is decelerated by the propeller fan 13 and the speed reducer 9, and the turntable 7 rotates.

The propeller fan 13 takes in outside air through an intake port 16 provided in the rear cabinet 4, a portion of which cools the magnetron 5, and exhausts it out of the main body through a duct 17.

(Indicated by A in Figure 2.

) The other part enters the oven 1 through the duct 18 and the air intake 19 provided in the oven 1.
The air is exhausted from an exhaust port 20 provided on the top surface of the main body through an exhaust duct 14.

(Indicated by B in FIGS. 1 and 2.) Further, the other part cools electrical components such as the high voltage transformer 24, and is exhausted to the outside of the main body through punched holes 21 and 22 provided in the chassis 3.

(Indicated by C in FIG. 1.) Next, the operation of the exhaust temperature detection function will be explained.

Food in oven 1 is heated and its temperature rises.

The air that enters the oven 1 through the intake port 19 of the oven 1 is heated by the temperature of the food and is exhausted outside the oven 1 through the exhaust port 20 on the top surface of the oven 1. It is detected by a thermistor 15.

The temperature of the exhausted air, that is, the temperature increase during heating of the exhaust gas, has a certain relationship with the temperature of the food, and the temperature of the food is controlled by detecting the temperature of the exhaust air.

Therefore, as mentioned above, the temperature of the air entering the oven 1 needs to be constant throughout the heating process, and if the temperature of the air entering the oven 1 changes during heating, the exhaust temperature will also change. Needless to say, this will impede the finish of the food.

In the conventional example shown in FIGS. 1 and 2, the motor 11 and the belt 12 are arranged in the air path between the propeller fan 13 and the intake port 16, so that the air flow from the intake port 16 to the propeller fan 13 is The outside air flows out and gets heated during long-term use, and the air inside the machine swirls and gets heated as shown by the broken lines in Figures 1 and 2, causing the air entering the oven 1 to become heated. Temperature is controlled by magnetron 5 or high voltage transformer 24
This has the drawback that the temperature of the food cannot be accurately controlled because heat from other foods is added and the temperature rises.

The present invention solves the above-mentioned drawbacks and aims to accurately control the temperature of food.

An embodiment of the present invention will be described below. FIG. 3 is a schematic side sectional view of one embodiment of the present invention, and FIG. 4 is a partially cutaway schematic top view of the same.

The same parts as in FIGS. 1 and 2 are indicated by the same numbers and symbols.

The difference between the present invention and the conventional example is that the propeller fan 13 is placed close to the intake port 16, and the belt 12 is provided on the opposite side.

Also, the intake port 23' of the duct 23 for efficiently sending cooling air to the magnetron and the intake port 18' of the duct 18 for sending outside air into the oven 1 are closer to the exhaust side of the propeller fan 13 than the belt 12. The point is that it was set up like this.

Next, we will explain the flow of air.

A portion of the outside air taken in by the propeller fan 13 from the intake port 16 provided in the rear cabinet 4 is transferred to the duct 23.
The magnetron 5 is cooled through the duct 17 and exhausted to the outside of the main body through the duct 17.

Further, a part of the air enters the oven 1 through the duct 18 through the air intake port 19, and is exhausted to the outside of the oven body through the exhaust duct 14.

In addition, a portion cools electrical components such as the high-voltage transformer 24 and is exhausted to the outside of the main body through punched holes 21 and 22 provided in the chassis 3.

As described above, the present invention connects the propeller fan 13 to the intake port 16.
1, the swirling of air and temperature rise as shown by the broken line in FIG. ' and 23' are connected to the exhaust side of the propeller fan 13 on the turntable drive belt 12.
Because they are placed closer together, the air heated by the belt 12 does not enter the ducts 18 and 23, and outside air with no temperature change can be charred inside the oven 1, allowing accurate food temperature control. It becomes possible.

As explained above, according to the present invention, it is possible to provide a high-frequency heating device that enables stable and accurate temperature control of food even during long-term use.

[Brief explanation of the drawing]

Fig. 1 is an internal explanatory side view of a high-frequency heating device showing a conventional example, Fig. 2 is a partially cutaway top view of the same, and Figs. 3 and 4 are internal explanatory views of a high-frequency heating device showing an embodiment of the present invention. They are a side view and a top view. 1... Oven, 5... Magnetron, 12... Turntable drive belt, 13
・・・・・・Propeller fan, 18.23・・・・・・
Duct, 18', 23'...Duct intake port.

Claims (1)

[Scope of utility model registration request] A propeller fan that blows air into the body is connected to one shaft of the motor, and a turntable drive belt is connected to the other shaft.
In a cooling air passage in which a propeller fan and a turntable are driven by a single motor, a propeller fan 13 is installed close to an intake port 16, and a propeller fan 13 is installed to blow air to the oven 1 and the magnetron 5, respectively. Duct 1
8 and 23, each of the intake ports 18' and 23' are provided closer to the exhaust side of the propeller fan 13 than the turntable drive belt 12.