Radiator Fan
A radiator fan has a case, a stator assembly, and an impeller assembly. The stator assembly is assembled in the case. The impeller assembly is assembled in the case and has an impeller, a shaft, and a magnetic ring. The impeller has a hub and multiple blades. The hub has a hub diameter. The multiple blades are connected to the hub, are disposed around the hub at equal angular intervals, and have a blade span diameter. A ratio of the hub diameter to the blade span diameter is greater than or equal to 0.395 and is less than or equal to 0.515. The shaft is rotatably assembled to the case. The magnetic ring is fixed inside the hub, is disposed around the shaft, and is separated from the shaft by a gap.
The present invention relates to a radiator fan, and more particularly to a radiator fan that produces very low noise and is capable of generating sufficient airflow.
2. Description of Related ArtA conventional radiator fan is a device that is widely used for cooling. In general, the conventional radiator fan has a case, a stator assembly, and an impeller assembly. The stator assembly has multiple wire coils. The impeller assembly has a hub and a magnetic ring fixed inside the hub. The magnetic ring is mounted around the multiple wire coils and separated from the multiple wire coils by a gap. The stator assembly controls the multiple wire coils to shift the magnetic field, to attract or repel the magnetic ring, and to drive the impeller assembly. The impeller generates airflow for cooling during spinning.
In the field of radiator fans, sufficient airflow, high static pressure, and low noise are the key features for promoting performance of the radiator fans. Taking the radiator fan applied to a car audio for instance, in order to avoid the noise of the radiator fan from diminishing performing quality of the car audio, low noise is a crucial key feature for promoting the performance of the radiator fan.
However, as the noise of the radiator fan is lower, the airflow generated by the radiator fan may be more insufficient. How to promote volume of airflow in premise of lowering the noise of the radiator fan is an important problem to be solved in the design and configurations of the radiator fans.
To promote the performance of the conventional radiator fan, the present invention provides a radiator fan to mitigate or obviate the aforementioned problems.
SUMMARY OF THE INVENTIONThe main objective of the present invention is to provide a radiator fan that has low noise and generates sufficient airflow during operation.
The radiator fan comprises a case, a stator assembly, and an impeller assembly. The stator assembly is assembled in the case. The impeller assembly is assembled in the case and has an impeller, a shaft, and a magnetic ring. The impeller has a hub and multiple blades. The hub has a hub diameter. The multiple blades are connected to the hub, are disposed around the hub at equal angular intervals, and have a blade span diameter. A ratio of the hub diameter to the blade span diameter is greater than or equal to 0.395 and is less than or equal to 0.515. The shaft is rotatably assembled to the case. The magnetic ring is fixed inside the hub, is disposed around the shaft, and is separated from the shaft by a gap.
Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
With reference to
With reference to
With reference to
With reference to
The impeller 31, 31A, 31B has an axial direction, a hub 311, 311A, 311B, and multiple blades 312. The axial direction of the impeller 31, 31A, 31B is perpendicular to the reference plane P of the radiator fan. The hub 311, 311A, 311B is disposed along the axial direction of the impeller 31, 31A, 31B, is hollow, has a hub diameter d, and a chamber with an opening facing downward. The multiple blades 312 are connected to the hub 311, 311A, 311B, are disposed around the hub 311, 311A, 311B, and have a blade span diameter D. A ratio d/D of the hub diameter d to the blade span diameter D is greater than or equal to 0.395 and is less than or equal to 0.515 (0.3958≤d/D≤0.515). Preferably, the ratio d/D of the hub diameter d to the blade span diameter D is greater than or equal to 0.430 and is less than or equal to 0.480 (0.430≤d/D≤0.480).
Each one of the multiple blades 312 has an inside edge 3121 connected to a periphery of the hub 311, 311A, 311B and an outside edge 3122 being distal from the inside edge 3121. The inside edge 3121 of each one of the multiple blades 312 has a top end. The outside edge 3122 of each one of the multiple blades 312 has a top end. With reference to
The shaft 32 is assembled in the hub 311, 311A, 311B along the axial direction of the impeller 31, 31A, 31B and is rotatably assembled to the case 10. The magnetic ring 33 is made of a permanent magnet, is fixed inside the hub 311, 311A, 311B, is disposed around the shaft 32, and is separated from the shaft 32 by a gap. The magnetic ring 33 is fastened to an inner surface of the chamber of the hub 311, 311A, 311B. The gap between the shaft 32 and the magnetic ring 33 makes the stator assembly 20 magnetically drive the impeller assembly 30, 30A, 30B to spin.
With reference to
With reference to
With reference to
By adjusting the ratio d/D of the hub diameter d to the blade span diameter D, the radiator fan in accordance with the present invention downsizes the hub 311, 311A, 311B and enlarges an area of each one of the multiple blades 312 in premise of lowing noise and generating sufficient airflow.
Even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and features of the invention, the disclosure is illustrative only. Changes may be made in the details, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Claims
1. A radiator fan comprising:
- a case;
- a stator assembly assembled in the case; and
- an impeller assembly assembled in the case and having an impeller having a hub having a hub diameter; multiple blades connected to the hub, disposed around the hub at equal angular intervals, and having a blade span diameter; and a ratio of the hub diameter to the blade span diameter being greater than or equal to 0.395 and being less than or equal to 0.515; a shaft rotatably assembled to the case; and a magnetic ring fixed inside the hub, disposed around the shaft, and separated from the shaft by a gap.
2. The radiator fan as claimed in claim 1, wherein the hub has
- a basal portion shaped as a tube with two opposite ends; and
- a cap portion formed at one of the two opposite ends of the basal portion and shaped as a hemisphere.
3. The radiator fan as claimed in claim 1, wherein the hub has
- a basal portion shaped as a tube with two opposite ends; and
- a cap portion formed at one of the two opposite ends of the basal portion and shaped as a cone.
4. The radiator fan as claimed in claim 1, wherein the hub has
- a basal portion shaped as a tube with two opposite ends; and
- a cap portion formed at one of the two opposite ends of the basal portion and shaped as a cone with a flat top.
5. The radiator fan as claimed in claim 1, wherein the ratio of the hub diameter to the blade span diameter is greater than or equal to 0.430 and is less than or equal to 0.480.
6. The radiator fan as claimed in claim 2, wherein the ratio of the hub diameter to the blade span diameter is greater than or equal to 0.430 and is less than or equal to 0.480.
7. The radiator fan as claimed in claim 3, wherein the ratio of the hub diameter to the blade span diameter is greater than or equal to 0.430 and is less than or equal to 0.480.
8. The radiator fan as claimed in claim 4, wherein the ratio of the hub diameter to the blade span diameter is greater than or equal to 0.430 and is less than or equal to 0.480.
9. The radiator fan as claimed in claim 1, wherein
- the radiator fan has a reference plane;
- the shaft has an axis being perpendicular to the reference plane of the radiator fan;
- each one of the multiple blades has an inside edge connected to a periphery of the hub and having a top end; and an outside edge being distal from the inside edge and having a top end; and
- a distance defined between the reference plane of the radiator fan and the top end of the inside edge is smaller than a distance defined between the top end of the outside edge and the reference plane of the radiator fan.
10. The radiator fan as claimed in claim 2, wherein
- the radiator fan has a reference plane;
- the shaft has an axis being perpendicular to the reference plane of the radiator fan;
- each one of the multiple blades has an inside edge connected to a periphery of the hub and having a top end; and an outside edge being distal from the inside edge and having a top end; and
- a distance defined between the reference plane of the radiator fan and the top end of the inside edge is smaller than a distance defined between the top end of the outside edge and the reference plane of the radiator fan.
11. The radiator fan as claimed in claim 3, wherein
- the radiator fan has a reference plane;
- the shaft has an axis being perpendicular to the reference plane of the radiator fan;
- each one of the multiple blades has an inside edge connected to a periphery of the hub and having a top end; and an outside edge being distal from the inside edge and having a top end; and
- a distance defined between the reference plane of the radiator fan and the top end of the inside edge is smaller than a distance defined between the top end of the outside edge and the reference plane of the radiator fan.
12. The radiator fan as claimed in claim 4, wherein
- the radiator fan has a reference plane;
- the shaft has an axis being perpendicular to the reference plane of the radiator fan;
- each one of the multiple blades has an inside edge connected to a periphery of the hub and having a top end; and an outside edge being distal from the inside edge and having a top end; and
- a distance defined between the reference plane of the radiator fan and the top end of the inside edge is smaller than a distance defined between the top end of the outside edge and the reference plane of the radiator fan.
13. The radiator fan as claimed in claim 9, wherein
- the case has a shroud having a space disposed inside the shroud; a first vent communicating with the space of the shroud; and a second vent communicating with the shroud; a base board disposed below the space of the shroud; and an axial tube portion disposed in the space and connected to the base board;
- the first vent and the second vent are disposed at two different sides of the shroud;
- the stator assembly is assembled to the base board and has multiple wire coils disposed around the axial tube portion;
- the impeller assembly is assembled in the space of the shroud;
- the shaft of the impeller assembly is rotatably assembled in the axial tube portion;
- the hub of the impeller has a chamber with an opening facing downward; and
- the magnetic ring is fastened to an inner surface of the chamber and disposed around the multiple wire coils.
14. The radiator fan as claimed in claim 10, wherein
- the case has a shroud having a space disposed inside the shroud; a first vent communicating with the space of the shroud; and a second vent communicating with the shroud; a base board disposed below the space of the shroud; and an axial tube portion disposed in the space and connected to the base board;
- the first vent and the second vent are disposed at two different sides of the shroud;
- the stator assembly is assembled to the base board and has multiple wire coils disposed around the axial tube portion;
- the impeller assembly is assembled in the space of the shroud;
- the shaft of the impeller assembly is rotatably assembled in the axial tube portion;
- the hub of the impeller has a chamber with an opening facing downward; and
- the magnetic ring is fastened to an inner surface of the chamber and disposed around the multiple wire coils.
15. The radiator fan as claimed in claim 11, wherein
- the case has a shroud having a space disposed inside the shroud; a first vent communicating with the space of the shroud; and a second vent communicating with the shroud; a base board disposed below the space of the shroud; and an axial tube portion disposed in the space and connected to the base board;
- the first vent and the second vent are disposed at two different sides of the shroud;
- the stator assembly is assembled to the base board and has multiple wire coils disposed around the axial tube portion;
- the impeller assembly is assembled in the space of the shroud;
- the shaft of the impeller assembly is rotatably assembled in the axial tube portion;
- the hub of the impeller has a chamber with an opening facing downward; and
- the magnetic ring is fastened to an inner surface of the chamber and disposed around the multiple wire coils.
16. The radiator fan as claimed in claim 12, wherein
- the case has a shroud having a space disposed inside the shroud; a first vent communicating with the space of the shroud; and a second vent communicating with the shroud; a base board disposed below the space of the shroud; and an axial tube portion disposed in the space and connected to the base board;
- the first vent and the second vent are disposed at two different sides of the shroud;
- the stator assembly is assembled to the base board and has multiple wire coils disposed around the axial tube portion;
- the impeller assembly is assembled in the space of the shroud;
- the shaft of the impeller assembly is rotatably assembled in the axial tube portion;
- the hub of the impeller has a chamber with an opening facing downward; and
- the magnetic ring is fastened to an inner surface of the chamber and disposed around the multiple wire coils.
17. The radiator fan as claimed in claim 13, wherein the first vent and the second vent are respectively disposed at a top portion of the shroud and a bottom portion of the shroud.
18. The radiator fan as claimed in claim 16, wherein the first vent and the second vent are respectively disposed at a top portion of the shroud and a bottom portion of the shroud.
19. The radiator fan as claimed in claim 13, wherein
- the first vent is disposed at a top portion of the shroud; and
- the second vent is laterally defined through the shroud.
20. The radiator fan as claimed in claim 16, wherein
- the first vent is disposed at a top portion of the shroud; and
- the second vent is laterally defined through the shroud.
Type: Application
Filed: Apr 17, 2018
Publication Date: Oct 17, 2019
Inventors: Dennis Eisen (Kaohsiung City), Ming-Yin Wang (Kaohsiung City), Shih-Chieh Su (Kaohsiung City), Yen-Yu Chen (Kaohsiung City), Wen-Dong Huang (Kaohsiung City)
Application Number: 15/955,419