Motor fan unit

• US 5,277,547 A
• Filed: 05/18/1992
• Issued: 01/11/1994
• Est. Priority Date: 05/18/1991
• Status: Expired due to Term

• Current Assignee: Usui Kokusai Sangyo Kaisha Limited
• Original Assignee: Usui Kokusai Sangyo Kaisha Limited
• Inventors: Washizu, Katsushi
• Primary Examiner(s): Look, Edward K.
• Assistant Examiner(s): Sgantzos, Mark
• Application Number:
  US07/884,695
• Time in Patent Office: 603 Days
• Field of Search: 415/208.1, 415/209.2, 415/209.3, 415/210.1, 165/122, 417/433.5, 417/423.14
• US Class Current: 415/208.1
• CPC Class Codes: F01P 5/06 Guiding or ducting air to, or from, ducted fans
• CPC Class Codes: F04D 25/166 using fans

Abstract

A twin motor fan unit is provided with two fan members mounted to parallel rotational shafts of a motor. The motor fan unit includes a rectifying plate to partition the fan members. The rectifying plate prevents turbulence at the rear faces of the respective fans that would otherwise be caused by mutual interference of the air stream leaving the fan. As a result, the motor fan unit enables an increased quantity of air to flow through the motor fan unit and also achieves a reduction in operating noise.

Claims

1. A twin fan unit comprising first and second fan members mounted respectively to first and second substantially parallel rotatable shafts, said fan unit having a front side orthogonal to said shafts for receiving air and a rear side orthogonal to said shafts for directing first and second rear streams of air from the respective first and second fan members and generally parallel to the shafts, said twin fan unit further including a rectifying plate disposed intermediate said first and second fan members and projecting rearwardly therefrom, said rectifying plate suppressing mutual interference of the first and second rear streams of the fan members for achieving a smooth flow of air and for reducing noise.

2. A twin fan unit as in claim 1, wherein said fan members are substantially coplanar.

3. A twin fan unit as in claim 1, wherein said rectifying plate is substantially parallel to said rotatable shafts.

4. A twin fan unit as in claim 3, wherein said rectifying plate is substantially S-shape.

5. A twin fan unit as in claim 3, wherein said rectifying plate is substantially X-shape.

6. A twin fan unit as in claim 3, wherein said rectifying plate is substantially Y-shape.

7. A twin fan unit as in claim 3, wherein said rectifying plate is substantially I-shape.

8. A twin fan unit as in claim 3, wherein said rectifying plate is substantially Z-shape.

9. A twin fan unit as in claim 1, wherein said rectifying plate extends partly around the first fan member, said twin fan unit further comprising a second rectifying plate extending partly around the second fan member.

10. A twin fan unit as in claim 9, wherein said rectifying plates are connected to one another.

11. A twin fan unit as in claim 9, wherein said rectifying plates are spaced from one another.