ANTI-BACKFLOW DEVICE FOR FAN UNIT

• US 20150211536A1
• Filed: 12/12/2014
• Published: 07/30/2015
• Est. Priority Date: 01/24/2014
• Status: Active Grant

• Current Assignee: Celestica Technology Consultancy (Shanghai) Co., Ltd.
• Original Assignee: Celestica Technology Consultancy (Shanghai) Co., Ltd.
• Inventors: WEI, Yen Hao
• Granted Patent: US 10,294,947 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F04D 19/002 Axial flow fans
• CPC Class Codes: F04D 25/14 and having shutters, e.g. automatically closed when not in use

Abstract

An anti-backflow device for a fan unit, which is fabricated by cutting a rectangle thin plate, includes: a plate body defining an air outlet to permit air outflow upon activation of the fan unit, and having at least two inner peripheral sides; a plurality of connection arms; and a plurality of blades. Each blade is connected a pair of the connection arms, which are in turn connected to two connecting holes formed in the inner peripheral sides of the plate body.

Claims

1. An anti-backflow device for a fan unit that includes a mounting frame with an air outlet, the anti-backflow device fabricated by cutting a rectangle thin plate and comprising:

a plate body adapted to be attached to the mounting frame of the fan unit, said plate body defining an air outlet in spatial communication with the air outlet of the mounting frame to permit air outflow upon activation of the fan unit, and said plate body having at least two inner peripheral sides;

a plurality of connection arms; and

a plurality of first blades, each of which is connected with a pair of said connection arms that are in turn connected to two connecting points formed in said inner peripheral sides of said plate body.

2. The anti-backflow device according to claim 1, wherein each of said connection arms has a width equivalent to a gap defined between one end of said first blade and one of said inner peripheral sides of said plate body adjacent to said one end of said first blade.

3. The anti-backflow device according to claim 1, wherein each of said connection arms has a longitudinal length equivalent to a width of each of said first blades, which is measured in a transverse direction to a longitudinal length of said first blade.

4. The anti-backflow device according to claim 1, wherein said plate body, said plurality of connection arms and said plurality of first blades cooperatively define a total surface area generally equivalent to an entire surface area of said thin plate.

5. The anti-backflow device according to claim 1, wherein said connecting points are connecting holes, said pair of connection arms having two top ends generally flush with said connecting holes formed in said inner peripheral sides of said plate body to facilitate insertion thereinto.

6. The anti-backflow device according to claim 1, wherein said plate body defines a total surface area generally equivalent to an entire surface area of said thin plate.

7. The anti-backflow device according to claim 1, wherein said plurality of first blades cooperatively define a total surface area generally equivalent to an entire surface area of the air outlet of the fan unit, which is in spatial communication with said air outlet defined by said plate body.

8. The anti-backflow device according to claim 1, wherein said thin plate is fabricated from Mylar.

9. The anti-backflow device according to claim 1, wherein said thin plate has a thickness less than 0.4 mm.

10. The anti-backflow device according to claim 1, wherein said thin plate has a thickness of 0.4 mm.

11. The anti-backflow device according to claim 1, wherein the fan unit has a dimension of 40 mm×

40 mm.

12. The anti-backflow device according to claim 1, wherein the fan unit has a dimension of 38 mm×

38 mm.

13. The anti-backflow device according to claim 1, further comprising at least one second blade having two opposite lateral sides connected to another pair of connecting holes formed in said inner peripheral sides.

14. The anti-backflow device according to claim 12, wherein said plurality of first blades and said second blade cooperatively define a total surface area equivalent to an entire surface area of the air outlet of the fan unit.

15. The anti-backflow device according to claim 13, further comprising an extra pair of connection arms for connecting said two opposite lateral sides of said second blade to said another pair of connecting holes formed in said inner peripheral sides, wherein each extra connection arm has a length equivalent to a distance defined between one of said inner peripheral sides and one lateral side of said second connection arm adjacent to said one of said inner peripheral sides.

16. The anti-backflow device according to claim 13, wherein said two opposite lateral sides of said second blade serve and function as said extra pair of connection arms such that each of said extra pair of connection arms has a length equivalent to a width of said second blade measured in transverse direction relative to a longitudinal length of said second blade.

17. The anti-backflow device according to claim 13, wherein said another pair of connecting holes, into which said two opposite lateral sides of said second blade extend respectively, are formed in said inner peripheral sides inboard to said connecting holes receiving the top most one of said first blades.

18. The anti-backflow device according to claim 13, wherein each of said connecting holes and said another pair of connecting holes is a circular hole.

19. The anti-backflow device according to claim 13, wherein each of said connecting holes and said another pair of connecting holes is a rectangular hole.

20. The anti-backflow device according to claim 13, wherein each of said connecting holes and said another pair of connecting holes has polygonal inner side surfaces.