JPH0132409B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heating device of a so-called hot air circulation type in which air within a heating chamber is circulated by a fan to uniformly raise the temperature of the air within the heating chamber.

Conventional Structure and Problems Conventionally, hot air circulation heating cookers have generated abnormal noises due to vibrations of the drive motor that drives the circulation fan that circulates the air in the heating chamber.

Below, we will explain the conventional example using a high-frequency heating cooker.
This will be explained with reference to FIG.

FIG. 1 is a cross-sectional view showing the internal structure of the high-frequency heating cooker.

In FIG. 1, there is a heating chamber 3 in which a heated object 2 is housed within a main body 1, and a magnetron 4 for supplying high frequency energy into the heating chamber during high frequency heating is provided on the upper surface outside the heating chamber. Reference numeral 5 denotes a heating box that houses the heating chamber 3, a heating device 6, and a circulation fan 7 for circulating air in the heating chamber. The circulation fan 7 is mechanically attached to a shaft 9 of a drive motor 8, and the drive motor 8 is fixed to a fixture 10, which is connected to a heat insulating plate 12 at the rear of the heating box via an elastic cushion. Fix it.

Reference numeral 13 denotes a self-cooling fan for cooling the drive motor 8, which is often used in hot air circulation systems. By the way, a heat insulating plate 15 is provided on the upper surface of the outside of the heating chamber to prevent the temperature of the main body 1 from rising.

Next, the principle of heating will be explained using FIG.

When the heating device 6 in the heating box is energized, the air in the heating box becomes high temperature, and the circulation fan 7 blows hot air into the heating chamber from the outlet provided on the rear surface 16 of the heating chamber. A suction port is also provided for the circulation fan 7 to suck in the air in the heating chamber, and the air in the heating chamber is circulated through this outlet and the suction port, and the temperature detection device 1 installed in the heating box is
6, the air in the heating chamber reaches the set temperature,
The object to be heated 2 in the heating chamber is cooked.

FIG. 2 is a partial sectional view showing the mounting structure of the drive motor 8. As shown in FIG.

In FIG. 2, the circulation fan 7 is made of sheet metal because it is required to be heat resistant. Therefore, when the circulation fan 7 is rotated, if there is an unbalance, the vibration of the drive motor 8 will increase, and since it is attached to the tip of the shaft 9, the vibration will increase due to the influence of the unbalance. In order to eliminate the unbalance of the levers, each component is balanced one by one, but it is currently extremely difficult to eliminate the unbalance due to the overlap with the yield.

Conventionally, as a method of preventing vibration of the drive motor 8, it has been fixed with screws 17 via an elastic cushion 11 between the fixture 10 and the heat insulating plate A12. However, with this fixing method, the elastic cushion 1
1, the vibration of the fixing fitting 10 is not directly transmitted to the heat insulating plate A, but the vibration is transmitted to the heat insulating plate A by the screw 17, and this vibration causes the contact parts between the metals to vibrate and cause an abnormality. It was connected to the generation of sound.

Purpose of the Invention The present invention solves the above-mentioned conventional drawbacks by interposing an elastic body with a gap between the fixing bracket and the screws when fixing the drive motor fixing bracket to the heat insulating plate, thereby reducing the vibration of the drive motor. The purpose is to prevent abnormal noises from occurring.

Composition of the Invention This invention fixes a fixing fitting for fixing a motor, which is a driving source of the circulation fan, to a heat insulating plate at the rear of a heating box that houses a heating device and a circulation fan, using screws through an elastic cushion. A gap is provided between the fixture and the screw to absorb the vibration of the fixture, thereby reducing abnormal noise generated by the drive motor.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. The basic configuration of the high-frequency cooking device is the same as the conventional example, and the same numbers have the same names.

FIG. 3 is a partial sectional view showing the mounting structure of the drive motor 8, similar to FIG. 2.

In FIG. 3, a fixture 9 that transmits the vibrations of the drive motor 8 is fixed to a heat insulating plate A12 with 17 screws via an elastic cushion 18 provided with a gap for absorbing the vibrations. With this configuration, the screw 17 and the fixture 9 do not come into direct contact with each other, and by providing a gap in the cushion 18, this gap absorbs the vibration of the fixture, and the driving motor 8 The vibration generated from the insulation plate A
As a result, abnormal noise caused by vibration of the drive motor 8 can be prevented.

Figure 4 shows an elastic cushion 1 with a cavity.
This is an example of No. 8.

As shown in FIG. 4, providing a circumferential gap makes it easier to absorb vibrations and also makes it easier to make a mold.

Effects of the Invention As explained above, the present invention provides the following effects in a hot air circulation type heating cooker.

Since an elastic body with a gap is interposed between the fixing fitting and the screw, it is possible to prevent the vibration of the drive motor from being transmitted to the heat insulating plate by the conventional screw, thereby reducing abnormal noise. Can be done.

Since the elastic body is provided with a void, this void serves as a cushion and can further dampen the vibrations of the drive motor.

The elastic body can be easily made by providing a circumferential gap.

The present invention has the advantage that it can be applied not only to reducing the vibration of a motor for driving hot air circulation, but also to reducing the vibration of a cooling motor of a high-frequency heating device.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing the internal structure of a conventional high-frequency heating cooker, Fig. 2 is a partial cross-sectional view showing the mounting structure of a conventional drive motor, and Fig. 3 is a gap in an embodiment of the present invention. FIG. 4 is a partial cross-sectional view showing the mounting structure of the drive motor when an elastic cushion having a gap is attached, and FIG. 4 is a perspective view of the outer appearance of the elastic cushion having a circumferential gap. 7... Circulation fan, 8... Drive motor, 9...
...Shaft, 11...Cushion, 12...Insulation plate, 1
7...Bis, 18...Cushion.

Claims (1)

[Claims] 1 A heating chamber that stores an object to be heated in the main body, a heating device that increases the temperature in the heating chamber, a circulation fan that is installed on a motor shaft and that circulates air in the heating chamber, and houses the heating device and the circulation fan. A heat insulating plate at the rear of the heating box is provided with a fixing fitting for fixing the motor that is the driving source of the circulation fan, and the fixing fitting is fixed to the insulating plate with screws, and a circumferential portion is provided between the fixing fitting and the screw. A heating cooker configured to include an elastic body having a void on top.