JP2962011B2 - High frequency heating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the cooling of electric components housed in a box in a high-frequency heating device.

[0002]

2. Description of the Related Art As shown in FIGS. 4 and 5, a conventional high-frequency heating device includes a heating chamber 3 in a main body 2 for storing and cooking food 1 and a high-frequency generator for supplying a high frequency to the heating chamber 3. 4, a power supply device 5 for driving the high-frequency generator 4, a cooling device 8 including a fan 6 and a motor 7 for cooling these electric components, and a control circuit 9 for controlling the heating time and high-frequency output. .

The flow of the cooling air from the high-frequency heating device is sucked by a fan 6 from an intake hole 10 in the rear wall of the main body 2, and the high-frequency heating device 4 and the power supply device 5 are cooled by blowing air. Part of the air that has cooled these electric components is exhausted from the exhaust hole 11 at the bottom of the main body 2, and part of the air is introduced into the heating chamber 3 through the intake hole 12 provided in the wall of the heating chamber 3, and the food 1 It is configured to be discharged from the exhaust hole 13 on the rear wall of the main body 2 together with the steam and smoke generated from the air.

[0004]

However, in the above-mentioned conventional structure, the wind generated by the fan 6 hits the electric parts and cools them, but each electric part has various shapes with irregularities. In addition, since the structural components are also close to the electric components, the wind flows while generating a vortex without forming a smooth laminar flow. For this reason, when the wind hits the electric parts and the structural parts, a loud wind noise is generated. The sound generated in this way is generally called noise and gives discomfort. As the opening on the wall around the main body, an intake hole and a bottom exhaust hole are provided on the rear wall, respectively, and particularly, sound leaking from the opening on the vertical wall, that is, from the rear wall of the main body can be heard well. Therefore, the noise level is maximized when heard behind the body. This is because there is an opening perpendicular to the sound propagation direction (horizontal direction). However, in general, the main body is often placed against the wall as shown in FIG. 5, so that the noise emitted from the opening behind the main body is reflected on the rear wall and a loud sound can be heard even in front of the main body. There was a problem that. The sound from the exhaust hole at the bottom of the main body is
Since it is orthogonal to the propagation direction with respect to the position in front of the main body, the level is lower than the sound generated from the rear wall of the main body.

On the other hand, due to magnetic leakage from a power transformer of a power supply for driving a high-frequency generator or a motor of a cooling device, an outer sound of the main body made of a magnetic material is magnetically vibrated, and abnormal noise is generated. As a result, there is a problem that the outer shell locally generates heat and becomes hot.

The present invention has been made to solve the above-mentioned problems, and a noise generated when cooling air from a fan hits an electric component or a structural component is prevented from directly leaking from an opening of a main body, so that a quiet high-frequency wave can be obtained. It is a first object to provide a heating device.

A second object is to prevent the outer shell of the main body and the wall of the heating chamber from magnetically vibrating due to magnetic leakage from components such as a power transformer and a motor to generate abnormal noise, and to generate heat in the outer shell due to induced current. It is to prevent.

[0008]

According to the present invention, in order to achieve the first object, a high-frequency generator and a power supply for driving the high-frequency generator are housed in a metal box, and an intake hole for taking in outside air of a cooling device. And the wall surface of the high-frequency heating device main body housing the box body, which is provided with the intake hole for taking in outside air, does not face each other.

In order to achieve the second object, a metal box housing a high-frequency generator and a power supply unit is formed of a damping plate.

[0010]

According to the present invention, the noise caused by the turbulent flow generated when the cooling air from the fan hits the electric parts and the structural parts is prevented from leaking directly from the opening of the main body. Reduce pressure level.

Further, it is possible to prevent the leakage magnetism from components such as a power transformer and a motor from directly acting on the outer shell of the main body, and to prevent an abnormal sound from being generated due to vibration, and to prevent the outer shell from being locally heated by induced current. .

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Referring to FIGS. 1 and 2, a heating chamber 16 for storing and cooking food 15 in a main body 14 is provided.
6, a power supply 18 for driving the high-frequency generator 17, a cooling device 21 including a fan 19 and a motor 20 for cooling these electric components, and controlling the heating time and high-frequency output Control circuit 22
It has. The rear wall of the main body 14 has an intake hole 23 through which the cooling device 21 takes in outside air. Further, the high frequency generator 17, the power supply 18, and the cooling device 21 are housed in a metal box 24. A cooling device 21 is attached to a bottom wall surface of the box 24, and an intake hole 25 for taking in outside air taken from an intake hole 23 of the main body 14 is provided. The other wall surface of the box 24 has an exhaust hole 26 for exhausting the wind after cooling the electric components.
Part of the gas enters the heating chamber 16 through an air inlet 27 on the wall surface of the heating chamber 16, passes through an exhaust hole 28 of the heating chamber 16 together with steam and smoke generated from the food 15 during heating, and passes through an exhaust hole 2 in the rear wall of the main body 14.
Exhaust from 9 In addition, a part is directly exhausted from the exhaust hole 30 in the rear wall of the main body 14.

Further, as shown in FIG. 3, the material constituting the box 24 accommodating the electric components is a plate 31 consisting of two layers.
And 32, a material in which a film-like or liquid resin 33 is sandwiched and bonded, that is, a damping plate 34. This plate is preferably made of a metal plate such as a steel plate or an aluminum plate.

The case where a damping steel plate using a steel plate is used as the damping plate will be described below. Next, the operation of the configuration of the embodiment will be described.

An intake hole 23 provided on a rear wall of the main body 14 and an intake hole 25 formed on a bottom surface of a box 24 accommodating the cooling device 21.
Since the air does not have a positional relationship to oppose, the wind blown out of the cooling device 21 in the box 24 hits the electric parts and the structural parts, and a vortex is generated. The noise does not reach the main body rear wall 16 intake hole 23 linearly. Therefore, the noise generated in the box 24 is
The gas leaks from the intake hole 25 of the box 24, but is attenuated by a change in direction once there. The noise energy leaked from the box 24 is diffused and a part thereof is
The noise level leaking from the main body 14 intake hole 23 can be attenuated.

As a result, the noise level around the main body 14 is extremely low, and the noise level in front of the main body is low and quiet even in an installation method in which a wall is provided at the rear of the main body 14.

Next, since the damping steel plate is used for the material of the box 24 containing the electric components, the steel plate or the like is generated by the leakage magnetism of the transformer used in the power supply device 18 or the motor of the cooling device 21. Vibration of the magnetic material can be reduced. Therefore, conventionally, the leakage magnetism causes the outer shell of the main body 14 and the heating chamber 1
The problem that the wall of No. 6 vibrates and generates an abnormal sound can also be solved.

In the case where the transformer and the outer casing are close to each other, even if there is a local temperature rise due to the induced current of the transformer, the resin layer of the intermediate layer of the damping steel sheet functions as a heat insulating material and serves as a heat insulator. The temperature rise of the outer wall is reduced. As a result, the influence of heat on the internal wiring and electronic circuit components around the box can be eliminated.

[0020]

As described above, the high-frequency heating device of the present invention comprises a wall having electric components housed in a box and having a cooling device air intake hole, and a body having an air intake hole for taking in outside air. Are not opposed to each other, so that the noise energy generated when the cooling air from the cooling device hits the electric parts and the structural parts is diffused and attenuated in the main body, and the noise leaks directly from the opening of the main body. In this way, a quiet high-frequency heating device can be provided.

Further, according to the present invention, an abnormal sound caused by magnetic vibration of the outer shell of the main body or the wall of the heating chamber due to magnetic leakage from components such as a power transformer and a motor is provided by forming a box housing electric components from a damping steel plate. Can be prevented, and heat generation of the outer shell due to the induced current can be prevented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional plan view of a high-frequency heating device according to an embodiment of the present invention.

FIG. 2 is a side sectional view of the apparatus.

FIG. 3 is a cross-sectional view of a wall of a box of the apparatus.

FIG. 4 is a cross-sectional plan view of a conventional high-frequency heating device.

FIG. 5 is a side sectional view of the apparatus.

[Explanation of symbols]

 14 Body 15 Food 16 Heating Room 17 High-Frequency Generator 18 Power Supply 21 Cooling Device 23 Suction Hole for Taking Outside Air of Main Body 24 Box 25 Suction Hole for Taking Outside Air of Cooling Device 34 Damping Steel Plate (Damping Plate)

──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Shinichi Sakai 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-63-314793 (JP, A) JP-A-59-31798 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H05B 6/64 F24C 7 / 02 541

Claims (2)

(57) [Claims] 1. A heating chamber for storing and heating food, a high frequency generator for supplying high frequency to the heating chamber, a power supply for driving the high frequency generator, and cooling the high frequency generator and the power supply. A cooling device, and a box housing the high-frequency generator, the power supply device, and the cooling device, and a bottom surface of the box provided with an intake hole for taking in outside air of the cooling device; and A high-frequency heating device in which the wall of the main body of the high-frequency heating device to be housed is not opposed to a wall provided with an intake hole for taking in outside air. 2. The high-frequency heating device according to claim 1, wherein the box housing the power supply device is constituted by a damping plate.