BOX ELECTRIC FANS

Field of the utility solution

The utility solution relates to mounting structure for the dissipating wind surface in box electric fans.

Background of the utility solution

Most commercial electric fans of box-type today use the system dissipatiing wind to spread wind around. The principle of this system is that the main wind blades are mounted on the main motor. When the motor operates, the main wind blades collect wind and blow the wind straight ahead. In order for the wind to be dissipated around, a dissipating wind surface is is attached to the fan body and placed in front of the main wind blades. The dissipating wind surface receives wind from the main wind blades and at the same time revolves around the axis of the main wind blades. To control wind speed, it is provided an adjusting mechanism in cylindrical or cone form of combination of these forms. However, these dissipating wind surfaces are found noisy due to friction, unstable in performance in addition to the fact that they used a lot of material in manufacture.

Furthermore, these dissipating wind surfaces must be adjusted such that they revolves faster than the main wind blades, which leads to the bump and shake of the fan. To overcome these effects, the adjusting device should be fastened by the users, which is inconvenient. Also, if the motor speed is reduced and an is turned off and restarted in the low wind mode, the dissipating wind surface revolves difficultly. In that case, the user should unfasten the speed adjusting device.

Summary

There is provided a mounting structure for dissipating wind surfaces for electric box fans of box type, which operates in balance and overcomes the drawbacks mentioned above.

To achieve this purpose, the mounting structure for the dissipating wind surface according to the utility solution comprises a cross-shaped plate fixed to the front surface of the box fan body by screw, dissipating wind surface is provided with bearings fitted, the cross-shaped plate is impaled by a bolt with a threaded part at the end, the screw is fitted with speed adjusting cap, a round gasket with a cut of hexagon form is mounted to block in front of the disipating wind surface. The round gasket is engaged in the corresponding hecxagon part in the cross-shaped plate, oil soaked felt ring is mounted between the disipating wind surface and the round gasket, a spring is inserted into the cylinder mounted on the inside of the speed adjusting cap.

Brief description of the drawings

Figure 1 is a perspective exploded view of the mounting structure for the dissipating wind surface in box electric fans, prepared to be fitted onto the fan body; Figure 2 is a perspective exploded view of the mounting structure for the dissipating wind surface in box electric fans, prepared to be fitted onto the fan body;

Figure 3 is a vertical crossection view of the mounting structure for the dissipating wind surface in box electric fans, fitted onto the fan body;

Detailed description of utility solution According to the Figure 1, Figure. 2, and Figure.3, the mounting structure for the dissipating wind surface according to the utility solution comprises a cross-shaped plate 1 fixed to the front surface 2 of the box fan body by screw 3, dissipating wind surface 4 is provided with bearings 5 fitted, the cross-shaped plate 1 is impaled by a bolt 6 with a threaded part 6.1 at the end, the bolt 6 is fitted with speed adjusting cap 7, a round gasket 8 with a cut of hexagon form is mounted to block in front of the disipating wind surface 4. The round gasket is engaged in the corresponding hecxagon part 11 in the cross-shaped plate 1 , oil soaked felt ring 9 is mounted between the disipating wind surface 4 and the round gasket 8, a spring 10 is inserted into the cylinder 7.1 mounted on the inside of the speed adjusting cap 7.

According Figure.3, when rotating the speed adjusting cap 7 clockwise, the spring 10 will force round gasket 8 against dissipating wind surface 4, which leads to the increase in fiction between the dissipating wind surface 4 and the round gasket 8, hence the revolving speed of the dissipating wind surface 4 is reduced. Conversely, when the speed adjusting cap 7 in turned in the counter clockwise, the spring will extended upwards, that makes the round gasket 8 is not against the dissipating wind surface 4. By then, the fiction between the dissipating wind surface 4 and the round gasket 8 is reduced, leading to the dissipating wind surface 4 revolves faster according to the speed of the main wind blades. Thanks to the accuracy of the bearings 5 and the elasticity of the spring 10, the dissipating wind surface 4 is kept in balance needed, this makes the fan itself does not get swung.