Patent Application
20070248461
The present invention relates to a fan with compact size and generates medium wind pressure and air supply.
There are two types of conventional fans which are axial fans as shown in
In practical use, a fan with mediate air supply and wind pressure is needed for removing heat satisfactorily. A latest fan is developed which includes stators on the axial fan so as to meet the requirement of mediate air supply and wind pressure. Unfortunately, the fan with stators cannot reach the purposes for sufficiently removing heat form the heat source.
As shown in
The present invention relates to a fan which comprises a casing having a narrow inlet and a wide outlet. A blade unit has a hub at a center thereof and a plurality of inclined blades extend radially from an outer periphery of the hub. The hub is located close to the inlet and the inclined blades extend toward the outlet. A positioning frame has a cone-shaped body and a plurality of arms extend from the cone-shaped body. The cone-shaped body has a narrow end which is located close to the inlet and a wide end which is located close to the outlet. The arms are connected to the casing.
The primary object of the present invention is to provide a fan which generates medium air supply and wind pressure so as to obtain higher efficiency for removing heat from the heat source. The fan is compact and can be manufactured by way of molding.
The present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, a preferred embodiment in accordance with the present invention.
Referring to
The blade unit 2 is driven by a motor 4 and has a hub 21 at a center thereof. A plurality of inclined blades 22 extend radially from an outer periphery of the hub 21. The hub 21 is located close to the inlet “A1” and the inclined blades 22 extend toward the outlet “A2”. A connection hole 211 is defined in a center of the hub 21 so that the output shaft 41 of the motor 4 is connected to the connection hole 211 so as to rotate the hub 21. A cover 212 is connected to the hub 21 and located to the inlet “A1”. A reinforcement ring 23 is connected to respective outside of the blades 22 so as to prevent from leakage of the pressure and avoid from shaking of the blades 22.
The positioning frame 3 has a cone-shaped body 31 and a plurality of arms 33 extend from the cone-shaped body 31. The cone-shaped body 31 has a narrow end which is located close to the inlet “A1” and a wide end which is located close to the outlet “A2”. The cone-shaped body 31 includes a chamber 32 defined therein so as to receive the motor 4 therein as shown in
The reinforcement ring 23 is located in the area “A4” at the stepped annular surface 11 of the casing 1 so as to reduce the gap “G” between the reinforcement ring 23 and the stepped annular surface 11, and the high pressurized air stream in the outlet “A2” cannot enter into the inlet “A1” which has lower pressure the gap between the blades 22 and the casing 1 as shown in
When the motor 4 drives the blade unit 2, the blades 22 expel the air in the fan “A” from the outlet “A2” and a negative pressure area is defined in the fan “A” and sucks air outside the fan “A” from the inlet “A1”. The air passes through the cone-shaped gap “A3” and out from the outlet “A2”. By this way, a medium air supply and wind pressure are generated with low noise. The fan can more efficiently bring heat from the heat source which is not shown. In this embodiment, the cone-shaped body 31 of the positioning frame 3 is stationary and the blade unit 2 is rotatable.
As shown in
The cone-shaped gap “A3” is defined between the axial and radial directions so as to generate medium air supply and wind pressure, and the noise can be reduced. The fan includes less number of parts wherein the casing, the blade unit, the positioning frame and motor can be manufactured individually and suitable for mass production. The motor is received in the cone-shaped body so that the fan is compact which is cooperated with electronic products. The shape of the casing and the cone-shaped body block the light from reaching the electronic parts in the fan such that the electronic parts do not affected by the light. The blades can be manufactured by conventional 3D CNC and can be easily released from molds. The air stream enters into the fan from the inlet and is pressurized due to centrifugal force so that the wind pressure is higher than that of axial fans. The air streams are guided axially in front of the outlet and meet the requirement of axial wind. The reinforcement ring reinforces the structural strength of the blade unit and also depresses shaking of the blades. The reinforcement ring also prevents the high pressurized air streams from entering into the inlet with lower pressure via the gap between the blades and the casing. The cone-shaped body has a wide diameter at the outlet so that a large sized motor can be used when needed. The blades and the cone-shaped body can be made individually and then are combined to each other, this is benefit for mass production by using 3D CNC. The cone-shaped body and the blades are co-rotated, there is no gap between the blades and the cone-shaped body so that no friction loss happens between the blades and the cone-shaped body and this increases the efficiency of the fan.
While we have shown and described the embodiment in accordance with the present invention, it should be clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.
