JPS6091586A - High frequency heater - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cooling structure in a high frequency heating device such as a microwave oven.

Conventional configuration and its problems Page 2 High-frequency heating devices such as microwave ovens require electrocoagulant components such as a magnetron as an oscillation source and a high-voltage transformer to supply high voltage to the magnetron in order to generate high frequencies. be. These power supply components, especially the magnetron, generate heat due to losses and require cooling.

Conventional high-frequency heating equipment uses a propeller fan, installed at approximately the same height as the magnetron, and focuses air on the magnetron to forcefully cool it. In addition, to cool other power supply components, the flow of air from the intake air was used, and the wind after cooling the magnetron was reused. In these cases, the cooling effect for power supply parts other than the magnetron is small, and the atmospheric temperature inside the main body tends to rise high.The disadvantage is that power supply parts, especially high-voltage transformers, must be large, highly heat-resistant, and expensive. .

Hereinafter, a conventional high frequency heating device as described above will be explained with reference to the drawings.

FIG. 1 shows a side view of a conventional high-frequency heating device. In Fig. 1, 1 is an outer box, 2 is a heating chamber in which food items are placed and subjected to high-frequency heating cooking, 3 is a door that can be opened and closed to cover the front opening of the heating chamber 2, and 4 is a door to the heating chamber 2. A waveguide 5 that supplies high frequency power is a magnetron that oscillates high frequency waves, and supplies high frequency power to the heating chamber 2 through the waveguide 4. A transformer x applies high voltage and heater voltage to the six-piece magnetron 6, 7 is a propeller fan for cooling, 8 is a drive motor that rotates the propeller fan 7, and 9 is used to prevent the cooling air generated by the propeller fan 7 from going around. A first air guide, 10 is a third air guide that guides the air that cools the magnetron 5 to the heating chamber 2, 11 is an intake hole that takes in the cooling air, and 12 is a hole that introduces the air that cools the magnetron 5 into the heating chamber 2. It is an exhaust hole.

The operation of the high-frequency heating device configured as described above will be described below. Air is taken in through an intake port 11 provided at the rear of a propeller fan 7 rotated by a drive motor 8, and the propeller fan 7 causes the magnetron 5,
Cool by blowing on transformer 6 etc. In this case, the propeller fan 7 and the rotary drive motor 8 are internally isolated by the first air guide.The wind that cools the magnetron 5, high-pressure transformer 6, etc. flows around and is sucked in by the propeller fan 7 again. The high voltage transformer 6 etc. will not be blown again.

Magnetron 5 is cooled...The wind is the third air guide 1
0, which is guided into the heating chamber through the exhaust port 12. However, the above configuration has a drawback in that power supply components other than the magnetron 6, especially the high voltage transformer 6, cannot be effectively cooled. Power supply parts, especially magnetron 5
There is loss during 1d oscillation, and cooling is required to avoid high temperatures. Therefore, in conventional models, propeller fan 7
The propeller fan 7 and rotary drive motor 8 were installed so that most of the cooling air hit the magnetron 5. Specifically, the propeller fan 7 was installed at approximately the same height as the cooling heat sink inside the yoke of the magnetron 7. was. Most of the cooling by the propeller fan 7 was performed on the magnetron 5, and almost no cooling effect was obtained on the other power source components.

Other power supply parts (especially transformer 6) also have losses and need to be cooled to avoid generating heat, but since the cooling effect of the propeller fan is small, larger and more expensive parts with better heat resistance must be used. I had to. In order to miniaturize the power supply parts as a whole and reduce costs, it is necessary to increase the cooling efficiency of other power supply parts while maintaining the current cooling efficiency of the magnetron.

Purpose of the Invention In view of the above-mentioned drawbacks, it is an object of the present invention to realize miniaturization and weight reduction of power supply components with an efficient cooling structure, and at the same time, to obtain a reduction in size and weight and cost of a high-frequency heating device. .

Structure of the Invention In order to achieve the above object, the high frequency heating device of the present invention includes a high frequency oscillator (magnetron) installed on the side surface of the heating chamber of the main body, a high voltage transformer installed on the bottom plate of the main body, and a rear wall surface of the main body provided with an intake hole. a first air guide installed between the first air guide 6 and a cooling propeller fan and a driving rotary motor installed between the page and the rear wall of the main body, and between the magnetron and the first air guide; a second air guide installed in the
The cooling propeller fan and the driving rotary motor are installed at a height approximately midway between the magnetron and the high voltage transformer, and the entire power supply component is efficiently cooled, making the power supply component smaller, lighter, and less expensive. This makes it possible to obtain pricing.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 2 and 3 show a high frequency heating device according to an embodiment of the present invention. 1 is an outer box, 2 is a heating chamber, 3 is a door that can be opened and closed, 4 is a waveguide, 5 is a magnetron, and 6 is a transformer, which is the same as the conventional example shown in FIG.

7 is a propeller fan, and 8 is a rotary drive motor, which is installed at a position considerably below the magnetron 5. 9
10 is a first air guide that prevents the cooling air from going around and has a taper of 7mm to make more effective use of space. 10 is a first air guide that prevents the cooling air from going around. 11 is an intake hole,
12 is an exhaust hole for sending cooling air into the heating chamber 2;
Reference numeral 13 denotes a second air guide of an elastic body that is installed between the magnetron 5 and the first air guide and can be freely attached and detached;
This has a great effect in cooling the magnetron 5.

The operation of the high-frequency heating device configured as described above will be described below.

In the high-frequency heating device having such a configuration, when the object to be heated is stored in the heating chamber 2, the door 3 is closed, and the start switch is pressed, high-frequency waves are oscillated from the magnetron 6 and cooking begins. At the same time as cooking begins, the cooling rotary drive motor 8 operates to rotate the cooling propeller fan 7 to cool power components such as the magnetron 6 and the high voltage transformer 6. Since the magnetron 5 generates heat with loss during oscillation and reaches a very high temperature, conventionally, cooling by the propeller fan 7 was mainly performed only for the magnetron 6. In other words, the propeller fan 7 was installed at approximately the same height as the cooling heat sink of the magnetron 5.

However, according to the cooling structure of this embodiment, the propeller fan 7
The rotary drive motor 8 is located at a height approximately midway between the magnetron 6 and the high voltage transformer 6, and is structured to cool both the magnetron 6 and the high voltage trough 260. Conventionally, when the propeller 7 was installed in this position, the magnetron 6 was not sufficiently cooled and reached a high temperature, resulting in the inability to obtain the desired output. When the propeller fan 7 is installed at a position lower than the height of the magnetron 5, the distance between the magnetron 5 and the propeller fan 7 increases, and the wind pressure and air volume hitting the magnetron 5 decreases.

In addition, since the wind hits the magnetron 5 diagonally, it becomes difficult for the wind to enter the inside of the magnetron 5 yoke, and a lot of the wind passes through between the magnetron 5 and the first air guide 9 and escapes upward. Become. In this embodiment, in order to improve this drawback, a second 9-page air guide 13 is installed between the magnetron 5 and the first air guide 90. This second air guide 13 can stop the air flowing upward between the magnetron 5 and the first air guide 90 and guide it into the yoke of the magnetron 5. It also guides the side of the magnetron 6, so it can be guided from the side of the magnetron 6. The escaping wind can also be guided into the inside of the magnetron 5's yoke.

By installing the second air guide 13 between the magnetron 5 and the first air guide 9 in this way, the propeller fan and rotary drive motor 8 can be lowered to a height approximately halfway between the magnetron 6 and the high voltage transformer 6. It also becomes possible to sufficiently cool the magnetron 5.

Also, by lowering the propeller fan 7, the high voltage transformer 6
The high voltage transformer 6 can be cooled by applying sufficient air to the
It is possible to realize lighter weight, smaller size, and lower cost.

According to the high frequency heating device of the present invention as described in detail,
By providing the second air guide between the magnetron and the first air guide, the magnetron can be easily removed even if the propeller fan and rotary drive motor are installed at a height approximately midway between the magnetron and the high-voltage transformer. It becomes possible to cool the

By lowering the propeller fan, sufficient air can be applied to the high voltage transformer and other power supply components, resulting in a large cooling effect, making it possible to reduce the overall weight, size, and cost of power supply components. This makes it easier to downsize and lower the price of the entire high-frequency heating device, which has great practical effects.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a conventional high-frequency heating device, and FIG. 2 is a side sectional view of a high-frequency heating device which is an embodiment of the present invention.
FIG. 3 is a plan sectional view of the main part of the device. 6... Magnetron, 6... High voltage transformer, 7... Propeller fan, 8...
Do rotation motor, 9...First air guide, 1
3...Second air guide. Name of agent: Patent attorney Toshio Nakao and one other person JP-A-Sho GO-91586 (4) Figure 3

Claims (1)

[Claims] A high-frequency oscillator installed on the side surface of the heating chamber of the main body, a high-voltage transformer installed on the bottom plate of the main body, a first air guide installed on the rear wall of the main body provided with an intake hole, and the first air guide and the rear of the main body. A cooling propeller fan and a driving rotary motor are installed between the walls, and a second air guide is installed between the magnetron and the first air guide. A high-frequency heating device having a configuration in which a rotary motor is installed at a height approximately midway between the magnetron and the high-voltage transformer.