IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0475577
(2001-04-27)
|
국제출원번호 |
PCT/SE01/00929
(2003-10-23)
|
§371/§102 date |
20031023
(20031023)
|
국제공개번호 |
WO02/08954
(2002-11-07)
|
발명자
/ 주소 |
|
출원인 / 주소 |
- Telefonaktiebolaget LM Ericsson (publ)
|
인용정보 |
피인용 횟수 :
15 인용 특허 :
6 |
초록
▼
A backflow preventing check valve for use in a fan unit in a forced air cooling system includes a generally rectangular frame, a plurality of adjacent parallel pivot axes mounted in the frame, and a plurality of adjacent vanes that pivot around the axes between open and closed positions. The axes ex
A backflow preventing check valve for use in a fan unit in a forced air cooling system includes a generally rectangular frame, a plurality of adjacent parallel pivot axes mounted in the frame, and a plurality of adjacent vanes that pivot around the axes between open and closed positions. The axes extend generally transverse to the direction of fluid flow through the valve, and each axis is offset from the center of gravity of its associated vane so that fluid flowing through the valve in an allowed direction moves the vanes toward the open position, and fluid flowing in a blocked direction moves the vanes toward the closed position. The axes are inclined at an angle (α) measured from a vertical reference, thereby causing the vanes to be urged by gravity to pivot towards the closed position.
대표청구항
▼
1. A check valve for preventing back-flow of fluid, comprising:a frame; a plurality of adjacent parallel pivot axes mounted in the frame; and a plurality of adjacent vanes, each of the vanes being pivotally mounted to an associated one of the parallel pivot axes, and pivoting between an open positio
1. A check valve for preventing back-flow of fluid, comprising:a frame; a plurality of adjacent parallel pivot axes mounted in the frame; and a plurality of adjacent vanes, each of the vanes being pivotally mounted to an associated one of the parallel pivot axes, and pivoting between an open position and a closed position; wherein the pivot axes extend generally transverse to the direction of fluid flow through the valve, and each pivot axis is offset from the center of gravity of its associated vane so that fluid flowing through the valve in an allowed direction moves the vanes toward the open position, and fluid flowing in a blocked direction moves the vanes toward the closed position; and wherein the pivot axes are inclined at an angle (α) measured from a vertical reference, thereby causing vanes that are in at least a partially open position to be urged by gravity to pivot towards the closed position. 2. The check valve of claim 1, further comprising a plurality of motion stops, each motion stop being mounted in a pivoting path of an associated vane and defining the open position of the associated vane through engagement therewith.3. The check valve of claim 2, wherein the motion stops define the open position of each vane so that a small angle (β) is formed between the general direction of fluid flow and the plane of each vane.4. The check valve of claim 3, wherein the motion stops define the same small angle (β) for each of the vanes in the open position.5. The check valve of claim 3, wherein the motion stop for a first vane is positioned such that in the open position, the first vane forms an angle (β′) with the general direction of fluid flow that is larger than the angle (β) formed by the other vanes.6. The check valve of claim 2, wherein the motion stops for the vanes are positioned such that in their open positions, the vanes form a small angle with the general direction of fluid flow that decreases for each successive vane.7. The check valve of claim 2, wherein the motion stops define the open position of each vane except a first vane so that all of the vanes except the first vane are parallel to the general direction of fluid flow, and the open position of all of the vanes except the first vane coincides with a balanced position in which the vanes are essentially balanced with regard to the force of gravity.8. The check valve of claim 7, wherein the motion stop for the first vane define the open position of the first vane so that a small angle (β>0) is formed between the general direction of fluid flow and the plane of the first vane.9. The check valve of claim 1, wherein the frame is a generally rectangular frame having a flat rear surface forming a base plane of the valve, said frame being adapted for attachment to a vertical surface for receiving a substantially horizontal flow through the valve and a generally rectangular aperture in the vertical surface.10. The check valve of claim 9, wherein the frame includes a front surface opposite the rear surface of the frame, said front surface having a rim surrounding the aperture and extending approximately normal to the rear surface and the base plane, said rim having a row of openings on opposite sides of the aperture for rotatably receiving opposite ends of the pivot axes.11. The check valve of claim 1, wherein the vanes have a generally rectangular flat shape having two short sides and two long sides, and each of the vanes is pivotally mounted to an associated one of the parallel pivot axes along a first long side of the vane.12. The check valve of claim 11, wherein the short sides of the vane have a length that causes each of the vanes except a last vane to overlap an adjacent vane when in the closed position.13. The check valve of claim 11, wherein a second long side of each vane is formed by two side edge portions that meet in an outwardly directed point forming an obtuse angle.14. A forced air cooling system for an enclosure accommodating heat producing electronic components, comprising:a plurality of fan units mounted the enclosure, each of the fan units having a casing provided with an air outlet opening, and containing a fan that draws heated air from a component space of the enclosure and exhausts the air drawn from the component space in an essentially horizontal direction from the outlet opening into the ambient air; and a check valve assembly covering each of the outlet openings of the fan units for allowing the flow of air out of the component space while blocking backflow of air through the outlet openings in the event that the associated fan fails, each of the check valve assemblies including a plurality of adjacent vanes, each of the vanes being pivotally mounted to an associated parallel pivot axis, and pivoting between an open position and a closed position; wherein the pivot axes extend generally transverse to the direction of airflow through the valve, and each pivot axis is offset from the center of gravity of its associated vane so that air flowing out of the component space moves the vanes toward the open position, and air attempting to flow into the component space moves the vanes toward the closed position; and wherein the pivot axes are inclined at an angle (α) measured from a vertical reference, thereby causing vanes that are in at least a partially open position to be urged by gravity to pivot towards the closed position. 15. The forced air cooling system of claim 14, wherein the check valve assembly includes a plurality of motion stops, each motion stop being mounted in a pivoting path of an associated vane and defining the open position of the associated vane through engagement therewith.16. The forced air cooling system of claim 15, wherein the motion stops define the open position of each vane so that a small angle (β) is formed between the general direction of fluid flow and the plane of each vane.17. The forced air cooling system of claim 16, wherein the motion stops define the same small angle (β) for each of the vanes in the open position.18. The forced air cooling system of claim 16, wherein the motion stop for a first vane is positioned such that in the open position, the first vane forms an angle (β′) with the general direction of fluid flow that is larger than the angle (β) formed by the other vanes.19. The forced air cooling system of claim 15, wherein the motion stops for the vanes are positioned such that in their open positions, the vanes form a small angle with the general direction of fluid flow that decreases for each successive vane, starting from a first vane.20. The forced air cooling system of claim 14, wherein the motion stops define the open position of each vane except a first vane so that all of the vanes except the first vane are parallel to the general direction of fluid flow, and the open position of all of the vanes except the first vane coincides with a balanced position in which the vanes are essentially balanced with regard to the force of gravity.21. A fan unit for use in a forced air cooling system serving to remove heat from a space of an enclosure accommodating heat producing components, said fan unit comprising:a casing provided with an air outlet opening; a fan supported in the casing that draws heated air from the enclosure and exhausts the air drawn from the enclosure in an essentially horizontal direction from the outlet opening into the ambient air; and a check valve assembly covering the outlet opening of the fan unit for allowing the flow of air out of the enclosure while blocking backflow of air through the outlet opening in the event that the fan fails, the check valve assembly having a plurality of adjacent vanes, each of the vanes being pivotally mounted to an associated parallel pivot axis that extends generally transverse to the direction of airflow through the valve, said vanes pivoting between an open position and a closed position; wherein each pivot axis is offset from the center of gravity of its associated vane so that air flowing out of the component space moves the vanes toward the open position, and air attempting to flow into the component space moves the vanes toward the closed position; and wherein the pivot axes are inclined at an angle (α) measured from a vertical reference, thereby causing vanes that are in at least a partially open position to be urged by gravity to pivot towards the closed position. 22. The fan unit of claim 21, wherein the check valve assembly includes a plurality of motion stops, each motion stop being mounted in a pivoting path of an associated vane and defining the open position of the associated vane through engagement therewith.23. The fan unit of claim 22, wherein the motion stops define the open position of each vane so that a small angle (β) is formed between the general direction of fluid flow and the plane of each vane.24. The fan unit of claim 23, wherein the motion stops define the same small angle (β) for each of the vanes in the open position.25. The fan unit of claim 23, wherein the motion stop for a first vane is positioned such that in the open position, the first vane forms an angle (β′) with the general direction of fluid flow that is larger than the angle (β) formed by the other vanes.26. The fan unit of claim 22, wherein the motion stops for the vanes are positioned such that in their open positions, the vanes form a small angle with the general direction of fluid flow that decreases for each successive vane, starting from a first vane.27. The fan unit of claim 21, wherein the motion stops define the open position of each vane except a first vane so that all of the vanes except the first vane are parallel to the general direction of fluid flow, and the open position of all of the vanes except the first vane coincides with a balanced position in which the vanes are essentially balanced with regard to the force of gravity.
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