JPS59888A - 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 Industrial Application The present invention relates to a cooling air supply configuration for cooling a high voltage transformer, a magnetron, a cooking timer, a printed circuit board, etc. of a cooker having a microwave oven function. .

Conventional structure and its problems Conventionally, this type of microwave oven used propeller fan air to directly hit a high-voltage transformer, magnetron, or the like.

Therefore, due to the nature of propeller fans, if the distance between the fan and the high-voltage transformer in particular becomes large, the cooling efficiency will drop significantly, making it impossible to employ a small-sized high-voltage transformer.

In other words, a propeller fan can produce a large amount of air, but the wind force is weak and the temperature rises rapidly, such as a high-voltage transformer, which requires a large heat dissipation area of the high-voltage transformer itself, which inevitably makes it difficult to downsize. The volume of the device itself was also increased.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned drawbacks of the conventional technology, and aims to utilize the advantages of propeller fans as they are, to efficiently cool high-voltage transformers in particular, and to downsize high-voltage transformers and the like.

Structure of the Invention In order to achieve the above object, the high-frequency heating device of the present invention concentrates the wind from the propeller fan for cooling also in front and behind the high-pressure transformer, thereby increasing the cooling efficiency of the high-pressure transformer as well as cooling the magnetron. However, it is also possible to lower the ambient temperature of the cooking timer and printed circuit board to prevent their temperatures from rising.

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

FIG. 1 shows a composite cooking device that combines a gas oven and a microwave oven. In the figure, it is an exhaust port. It is operated using the knobs on each part of the operation panel 2.

Figure 2 shows the configuration of the air guide and U-turn guide incorporated into the composite cooking device. Cooling air sucked in by the action of the propeller fan 3 is concentrated on the primary coil or secondary coil of the high voltage transformer 6 by the air guide 5.

Furthermore, the air collected by the anti-fog guide 8, which is used to cool the magnetron 7 and supply air to prevent the oven glass from fogging, passes through the punched hole 9 of the oven and enters the heating chamber 10, which is then opened to the oven door. Prevents glass from fogging. On the other hand, a U-turn guide 11 is provided below the anti-fog guide 8 to cool the front side of the high voltage transformer 6. The primary air of the burner 12 takes in surplus air from the propeller fan 3.

Next, in Figures 3 and 4, hole 1 of the body back plate
Air from outside 3 once enters the ventilation chamber 14 and cools the drive motor 15 of the propane fan 3. propeller fan 3
The wind in the direction of the centrifugal force of the rotation is partially converted into the horizontal direction by the annular plate of the propeller guide 4. propeller fan 3
The wind intensively cools the rear coil portion of the high voltage transformer 6 by the air guide 5. A punch hole is provided in the mounting base 16 of the high-voltage transformer 6, which serves to promote cooling of the high-voltage transformer 6 and to lower the ambient temperature of the printed circuit board 17 located in the center of the high-voltage transformer mounting base. . The wind passing through the gap between the U-turn guide 11 and the heating chamber 1o has the effect of cooling the cooking timer 18.

Effects of the Invention As described above, according to the present invention, the following effects can be obtained.

(1) Air guides and U-turn guides allow air to be applied to both sides of the high-voltage transformer, so even a small high-voltage transformer can produce large output.

(2) By concentrating the air guide on the primary coil or the secondary coil, it is possible to effectively lower the particularly high temperature of the coil.

(3) Since the blower chamber 14 is provided on the intake side of the propeller fan, only cold air from outside comes in, so warm air does not return and the temperature of the propeller fan motor 15 can be kept low. .

(4) Since the temperature of the high-voltage transformer can be cooled through the punched holes in the mounting base, it is possible to lower the ambient temperature of the printed Y board inside.

(6) Since there is a space between the U-turn guide and the oven, the temperature of the oven does not get too crowded and the temperature of the cooking timer can be lowered.

(6) The anti-fog guide collects air that has passed through the magnetron and high-voltage transformer, enters the oven, and helps prevent the oven door glass from fogging.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view of a high-frequency heating device that is an embodiment of the present invention, Fig. 2 is a partially broken perspective view of the device seen from the back side, and Fig. 3 is a plan sectional view of the main part of the device. , FIG. 4 is a side sectional view of the same device. 3... Propeller fan, 4... Propeller guide, 5... Air guide, 6...
- High voltage transformer, 7... Magnetron (high frequency heating device), 11... U-turn guide. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (1)

[Scope of Claims] 1. A heating chamber that stores and heats food; a high-frequency oscillator that supplies high-frequency energy into the heating chamber; and a cooling fan located outside the heating chamber that cools the high-frequency oscillator;
The cooling air guide includes a cooling air guide for a high-voltage transformer fixed to the cooling fan, and a U-turn guide located downstream of the high-voltage transformer, and the cooling air guide directs the wind from the cooling fan to the upstream side of the high-voltage transformer. The high-frequency heating device is configured to guide the air to the downstream side of the high-voltage transformer by the U-turn guide. 2. A mounting base for a high-voltage transformer surrounds a printed circuit board, and a punch hole is provided below the high-voltage transformer to cool the mounting base for the high-voltage transformer.
The high-frequency heating device described in Section 1. 3. The high-frequency heating device according to claim 1, wherein the intake air blowing chamber of the cooling fan is provided by the propeller guide and the body on the suction side of the cooling fan.