JPS63178483A - Radio 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 means for preventing magnetic noise in the outer shell due to rush current generated when power is applied to a high voltage transformer of a high frequency heating device.

BACKGROUND OF THE INVENTION In recent years, microwave ovens have become more widespread, and as a result, their prices have been reduced, and there has been a demand for smaller and lighter microwave ovens, leading to space savings. However, the parts that make up the outer shell of the heating chamber and heating device are becoming thinner, and the overall strength is becoming weaker. Moreover, while miniaturization is desired, the inside of the cooking cabinet is also required to be larger, which contradicts each other, resulting in a reduction in the space especially for the operating section and the power supply section. The power supply section is equipped with a high-voltage transformer that supplies power to the magnetron, and the magnetism of the high-voltage transformer causes the magnetic material used in the outer shell to vibrate, producing unpleasant noise (magnetic noise). There is.

Problems to be Solved by the Invention Conventionally, as a means for preventing magnetic noise, as shown in FIG. In order to prevent magnetic leakage from the core from affecting the outer shell 1, there is a method of installing the high voltage transformer 6 so that the laminated surface of the iron core of the high voltage transformer is perpendicular to the side wall of the heating chamber 2, but the high voltage transformer 6 Since the width of the coil is wider than the width a of the iron core, the space of the power supply section cannot be reduced, which goes against miniaturization. In addition, since the lead wire 2 of the high voltage coil 1Ill3 of the high voltage transformer 6 approaches the outside I[;, which is dangerous, it is necessary to attach an insulating note 4 to the outer shell 1, resulting in poor workability and increased costs. It has become.

In addition, as shown in Fig. 3, there is a conventional method of fixing a non-magnetic metal object 6 to the vibrating part by welding as shown in Fig. 3, but the outer surface of the outer shell 1 is If the non-magnetic metal object 5 is to be welded and has been painted, the paint must be removed or the non-magnetic metal object 6 must be welded before painting.
However, welding marks are easily visible even after painting, resulting in poor appearance and increased costs. In addition, as a conventional example, as shown in FIG. 4, there is a method in which a ferromagnetic metal plate 7 is provided near the iron core surface of the high voltage transformer θ, and the leakage magnetic flux is consumed by the metal plate, but this also increases cost. It becomes. In addition, as a conventional example, as shown in FIG. 5, a cushion rubber 8 is provided between the high voltage transformer 6 and the outer shell 10, and the cushion rubber 8 is sandwiched between the high voltage transformer 6 and the outer shell 1, and the outer shell 1 is lightly pushed outward to generate vibration noise. is holding down. The cushion rubber 8 is attached to the high voltage transformer e side with double-sided tape 9 so that the cushion rubber 8 can be easily installed. Since the temperature approaches 100°C, the adhesive for the double-sided tape 9 must be resistant to high temperatures and impact. Furthermore, if the high voltage transformer 6 needs to be replaced, the cushion rubber 8 must be replaced, and a new double-sided tape 9 is required, resulting in poor serviceability.

The present invention solves these conventional problems, and with a simple configuration can prevent magnetic noise in the outer shell due to rush current generated when power is applied to the high voltage transformer of a high frequency heating device. The object of the present invention is to provide an excellent high-frequency heating device that does not require the installation of metal plates or cushion rubber.

Means for Solving the Problems In order to achieve the above object, the high-frequency heating device of the present invention has a structure in which a high-voltage capacitor and a high-voltage capacitor mounting plate are arranged in a space where the outer shell faces the high-voltage transformer.

Function: The high-frequency heating device of the present invention prevents magnetic leakage caused by rush current generated when power is applied to the high-voltage transformer by installing a high-voltage capacitor in the space between the high-voltage transformer and the outer shell. The high-voltage capacitor mounting plate consumes magnetic leakage and has the effect of suppressing magnetic vibration noise from the outer shell.

EXAMPLE Hereinafter, an example of the present invention will be described based on the drawings.

As shown in FIG. 1, 10 is a heating chamber, 11 is a heating chamber wall, and a waveguide 12 is fixed to the heating chamber wall 11 by welding. The legs of the high voltage transformer 6 are inserted into claws 14 provided on a bottom plate 13 which is a part of the outer shell. Capacitor mounting plate 16, outer leg of high voltage transformer 6, and bottom plate 1
3, and attach the high voltage transformer 6 and capacitor mounting plate 16 to the bottom plate 13 with bolts 16 and nuts 1a.
Fixed to. Then, the high voltage capacitor 19 is sandwiched between the other capacitor mounting plate 18 and the capacitor mounting plate 16 fixed to the bottom plate 13 is tightened with screws 2o to fix the high voltage capacitor 19.

With the above configuration, when power is applied to the high voltage transformer 6'
The leakage magnetic flux 21 due to the inrush current generated in
can eliminate magnetic vibration noise. Therefore, outer shell 1
The metal plates and cushion rubber used to suppress magnetic vibration noise are no longer required, reducing the number of man-hours and two parts.

Effects of the Invention As is clear from the description of the embodiments above, the following effects can be obtained according to the high frequency heating charge of the present invention.

(1) Leakage magnetic flux due to rush current generated when power is applied to the high-voltage transformer can be reduced by installing a high-voltage capacitor and a capacitor mounting plate between the space where the high-voltage transformer and the outer shell face each other. Because the magnetic vibration sound of the outer shell is suppressed due to consumption,
Metal plates and cushion rubber are no longer required, and the number of work steps and number of parts can be reduced.

(2) By placing the high-voltage capacitor in the space where the outer shell faces the high-voltage transformer, the distance between the high-voltage capacitor and the high-voltage transformer is shortened, and the routing of the high-voltage lead wire is shortened, reducing the cost and work of the high-voltage lead wire. Sexuality improves.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a main part of a power supply section of a high-frequency heating apparatus according to an embodiment of the present invention, FIG. 2 is a cross-sectional plan view of a main part of a power supply section of a conventional high-frequency heating apparatus, and FIG. FIG. 4 and FIG. 6 are front sectional views of main parts of the power supply section of a conventional high-frequency heating device, respectively. 1... Outer shell, 6... High voltage transformer, 1
o...Heating chamber, 11...Heating chamber wall, 1
5.18... Capacitor mounting plate, 19...
...High voltage capacitor. Name of agent: Patent attorney Toshio Nakao and 1 other person49
--Ichishaku 17 Detsuke Ward N Capacity 4th Figure f9 Figure 5

Claims (1)

[Claims] a high-frequency oscillator, a high-voltage transformer, a high-voltage capacitor, a high-voltage diode, and a cooling fan motor that cools the high-frequency generator; High-frequency heating comprising: an outer shell that protects the high-frequency generator and the cooling fan; and a high-voltage capacitor and a high-voltage capacitor mounting plate for fixing the high-voltage capacitor are arranged in a space where the high-voltage transformer and the outer shell face each other. Device.