JPS6028885Y2 - 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.

A magnetron 5 is coupled to the oven 1 via a waveguide 6.

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

7 is a turn tape provided in the oven 1, the rotation axis of which is directly connected to a pulley 8, and a reduction gear 9 and a belt 10.
are connected.

Further, the speed reducer 9 is connected to a motor 11 by a belt 12, and a 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 fan 13 and the speed reducer 9, and the turntable 7 rotates.

The fan 13 draws outside air through an intake port 16 provided in the rear cabinet 4, a portion of which cools the magnetron 5, and is exhausted to the outside of the main body through a duct 17.

(Indicated by A in FIG. 2.) The other part is connected to the oven 1 from the air intake port 19 provided in the oven 1 through the duct 18.
The air enters the inside of the oven 1 and is exhausted to the outside of the main body through an exhaust duct 14 from an exhaust port 20 provided on the top surface of the oven 1.

(Indicated by B in Figures 1 and 2.

) Still another 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 Figure 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 air intake port 19 of the oven 1 is heated by the heat 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 fan 13
Since the motor 11 and belt 12 are arranged in the air path between the air intake port 16 and the air intake port 16, the flow of outside air from the air intake port 16 to the fan 13 is forced out, and the air inside the aircraft is The air swirls as shown by the broken line in the figure, and the temperature of the air entering the oven 1 rises due to the heat from the magnetron 5, high-voltage transformer 24, etc., making it impossible to accurately control the temperature of the food.

Furthermore, the temperature of the air inside the aircraft increases, resulting in insufficient cooling of electrical components such as the magnetron 5 and the high-voltage transformer 24.

In addition, in high-voltage transformers and the like, the thickness of the winding must be increased, which has the disadvantage of increasing costs.

Furthermore, there was a problem with the temperature rising throughout the aircraft due to insufficient cooling inside the aircraft.

The present invention is intended to eliminate the above-mentioned drawbacks, and aims to accurately control the temperature of food and sufficiently cool electrical parts and the like.

The following 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 fan 13 is placed closer to the intake port 16 and the belt 12 is provided on the opposite side.

Further, a duct 23 is provided between the magnetron 5 and the fan 13 in order to efficiently send cooling air to the magnetron.

Further, a duct 18 for sending outside air into the oven 1 is provided, and the intake port 18' of the duct 18 is connected to the intake port 23 of the duct 23.
' is closer to the propeller fan 13 than the propeller fan 13.

Next, we will explain the flow of air. A portion of the outside air taken in by the propeller fan 13 through the intake port 16 provided in the rear cabinet 4 cools the magnetron 5 through the duct 23 and is exhausted to the outside of the main body through the duct 17.

The other part 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.

Furthermore, 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.

In the present invention, as described above, the fan 13 is placed close to the intake port 16, so that the swirling of air as shown by the broken line in FIG. 1 is eliminated, and outside air can be efficiently sucked into the main body.

In addition, the duct 18 that sends outside air into the oven 1 and the duct 23 that sends outside air to the magnetron are connected to the propeller fan 1.
3, the outside air sucked in through the intake port 16 can be efficiently sent to the oven 1 and the magnetron 5.

Furthermore, since the duct intake port 18' is closer to the propeller fan than the duct intake port 23', a small amount of high-temperature air that swirls inside the duct 23, cools the magnetron 5, and flows backwards will not enter the duct 18. There is no oven 1
It is possible to send outside air with no temperature changes into the interior, making it possible to accurately control the temperature of food.

A comparison of the temperatures of each part after the temperature test according to the technical standards is as follows.

Conventional example Invention high voltage transformer winding temperature (primary side) 146℃ 120℃ (
Secondary side) 153°0125°C Oven popular temperature (inside duct 18) 55°C 24°C Belt atmosphere temperature 60°0 29°C
(Measured at a room temperature of 20°C) As described above, the interior of the aircraft is efficiently cooled, making it possible to reduce the winding diameter of high-voltage transformers, etc., and increasing the durability of reduction gears and belts. , it becomes possible to use a rubber belt for the belt, which has the advantage of low cost.

As explained above, according to the present invention, it is possible to efficiently cool the inside of the aircraft, and it is low cost, and if it has an exhaust temperature detection function, it is possible to accurately control the temperature of food, etc. A high frequency heating device having advantages can be provided.

[Brief explanation of drawings]

Fig. 1 is an explanatory side view of the inside 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 insides of a high-frequency heating device showing an embodiment of the present invention. They are an explanatory side view and a top view. 1...Oven, 5...Magnetron, 13...Fan, 16...Intake port,
18, 23... Duct, 18', 23'...
...Duct intake.

Claims (1)

[Scope of utility model registration request] A fan cools the magnetron, high voltage transformer, etc.
Furthermore, in ovens that allow air to enter,
A fan 13 is provided close to the intake port 16, and a duct 18 for introducing air into the oven 1 and a duct 23 for cooling the magnetron 5 are provided. A high-frequency heating device characterized in that the high-frequency heating device is provided closer to the exhaust side of the fan 13 than the intake port 23' of the fan 13.