IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0285986
(1981-07-23)
|
우선권정보 |
DE-0030131 (1980-08-08) |
발명자
/ 주소 |
- Kutzner, Luitpold
- Postenrieder, Erwin
- Hellmann, Falk
|
출원인 / 주소 |
|
대리인 / 주소 |
Toren, McGeady and Stanger
|
인용정보 |
피인용 횟수 :
9 인용 특허 :
1 |
초록
▼
A draft limiting device for controlling the draft in a flue gas passage, includes a flap which is supported on a swing shaft in a secondary air inlet for swiveling movement between a closed position, at which the flap extends in a substantially vertical plane to block entry of air from a room into t
A draft limiting device for controlling the draft in a flue gas passage, includes a flap which is supported on a swing shaft in a secondary air inlet for swiveling movement between a closed position, at which the flap extends in a substantially vertical plane to block entry of air from a room into the secondary air inlet, and a fully open position at which the flap is displaced a certain angle about the axis of the swing shaft to admit air through the air inlet to the flue gas passage. A solid, semi-cylindrical member is fixed to the flap so that the center of radius of the member is parallel to the swing shaft axis, and the member extends on diametrically opposite sides of the swing shaft axis. The member thereby provides a restoring moment to the flap as the flap is moved in response to a differential pressure from the closed to the open position. The magnitude of the restoring moment is either constant or decreases as the flap moves in the direction from the closed to the open position. This arrangement serves to maintain the draft in the flue gas passage at a desired value.
대표청구항
▼
1. A draft limiting device for controlling the draft in a flue gas passage by admitting air from a room through a secondary air inlet to the flue gas passage, comprising a flap, frame means for forming a transverse cross-section of the secondary air inlet and for supporting said flap in the secondar
1. A draft limiting device for controlling the draft in a flue gas passage by admitting air from a room through a secondary air inlet to the flue gas passage, comprising a flap, frame means for forming a transverse cross-section of the secondary air inlet and for supporting said flap in the secondary air inlet, means including a swing shaft associated with said flap for enabling swivelling movement of said flap about the axis of said swing shaft between a closed position at which said flap prevents air from entering the secondary air inlet and a fully open position at which said flap allows air from the room to be admitted through the secondary air inlet, restoring means on said flap for providing a restoring moment to said flap about the axis of said swing shaft when said flap is moved in response to differential pressure over a path between said closed position and said fully open position for urging said flap toward said closed position, said restoring means being arranged so that said restoring moment is of a magnitude which is either substantially constant or decreases as said flap moves over at least a part of said path from said closed position toward said fully open position, wherein said flap, said frame means, said swing shaft and said restoring means are arranged so that a secondary air passage is provided within the secondary air inlet, the secondary air passage having a transverse cross-section which extends between only one side of said swing shaft and a portion of said frame means when said flap moves between said closed and said fully open positions, and a raised shield member on said flap for closing the transverse cross-section of the secondary air inlet which extends between the diametrically opposed side of said swing shaft and the remaining portion of said frame means when said flap moves between said closed and said fully open positions, wherein said shield member is generally semi-cylindrical in shape and has a center of radius which substantially coincides with the axis of said swing shaft, said frame means includes an inside top edge which extends parallel to the axis of said swing shaft, and the radius of said shield member corresponds to the distance between said swing shaft and said inside top edge of said frame means so that the outer circumferential surface of said shield member remains closely adjacent to said inside top edge when said flap moves between said closed and said fully open positions. 2. A draft limiting device according to claim 1, wherein said shield member abuts said flap along a planar surface on said shield member which surface is parallel to the center of radius of said shield member. 3. A draft limiting device for controlling the draft in a flue gas passage by admitting air from a room through a secondary air inlet to the flue gas passage, comprising a flap, frame means for forming a transverse cross-section of the secondary air inlet and for supporting said flap in the secondary air inlet, means including a swing shaft associated with said flap for enabling swivelling movement of said flap about the axis of said swing shaft between a closed position at which said flap prevents air from entering the secondary air inlet and a fully open position at which said flap allows air from the room to be admitted through the secondary air inlet, restoring means on said flap for providing a restoring moment to said flap about the axis of said swing shaft when said flap is moved in response to differential pressure over a path between said closed position and said fully open position for urging said flap toward said closed position, said restoring means being arranged so that said restoring moment is of a magnitude which is either substantially constant or decreases as said flap moves over at least a part of said path from said closed position toward said fully open position, wherein said flap, said frame means, said swing shaft and said restoring means are arranged so that a secondary air passage is provided within the secondary air inlet, the secondary air passage having a transverse cross-section which extends between only one side of said swing shaft and a portion of said frame means when said flap moves between said closed and said fully open positions, and a raised shield member on said flap for closing the transverse cross-section of the secondary air inlet which extends between the diametrically opposed side of said swing shaft and the remaining portion of said frame means when said flap moves between said closed and said fully open positions, wherein said frame means includes an inside top edge and an inside bottom edge, both of said edges extending parallel to the axis of said swing shaft and said swing shaft is located closer to said inside top edge than to said inside bottom edge to define a smaller flap part which extends between said swing shaft and said inside top edge and a larger flap part which extends between said swing shaft and said inside bottom edge, and at least a part of said shield member extends over said smaller part for providing a counterbalance weight for the larger flap part, said shield member forming a part of said restoring means, wherein said restoring moment is provided by gravitational force. 4. A draft limiting device according to claim 3, including an elongated arm connected for movement with said flap and extending substantially horizontally from said flap when said flap is in said closed position, at least one weight on said arm, said weight being arranged for adjustable movement in the longitudinal direction of said arm, and bush means fitted on said swing shaft for securing one end of said arm and fixing said arm at a desired position about the axis of said swing shaft, said at least one weight on said arm being substantially lighter than said counterbalance weight provided by said shield member for providing fine adjustment of the center of gravity of said flap and all parts connected for movement with said flap when said at least one weight is moved in the long direction of said arm. 5. A draft limiting device for controlling the draft in a flue gas passage by admitting air from a room through a secondary air inlet to the flue gas passage, comprising a flap, said flap being mounted for swivelling movement about a swing axis between a closed position at which said flap substantially prevents air from entering the secondary air inlet and a fully open position at which said flap allows air from the room to be admitted through the secondary air inlet, restoring means associated with said flap for providing a restoring moment to said flap about said swing axis when said flap is moved in response to differential pressure over a path between said closed position and said fully open position for urging said flap toward said closed position, said secondary air inlet having a transverse cross-section which is subdivided by said swing axis into two inlet portions wherein a first one of said two inlet portions defines a secondary air passage when said flap is moved toward said fully open position, and a three-dimensional shield member fixed for movement together with said flap, said shield member having a curvilinear surface which at least partly circumscribes said swing axis, the generatrix of said curvilinear surface corresponding substantially to the borderline of the secondary air inlet which defines said second inlet portion so that said second inlet portion is closed as said flap swivels over at least part of said path of movement from said closed position toward said fully open position. 6. A draft limiting device as set forth in claim 5, wherein said shield member is generally semi-cylindrical in shape. 7. A draft limiting device as set forth in claim 5, including shaft means for defining said swing axis as substantially horizontal in space. 8. A draft limiting device as set forth in claim 5, wherein the area of said first inlet portion is larger than that of said second inlet portion. 9. A draft limiting device as set forth in claim 7, wherein said first inlet portion is located below said swing axis. 10. A draft limiting device as set forth in claim 5, wherein said shield member forms at least a part of said restoring means, said restoring moment being provided by gravitational force. 11. A draft limiting device as set forth in claim 5, said restoring means being arranged so that said restoring moment is of a magnitude which is either substantially constant or decreases as said flap moves over at least a part of said path from said closed position toward said fully open position. 12. A draft limiting device as set forth in claim 5, including a swing shaft associated with said flap for enabling said swivelling movement of said flap about said swing axis. 13. A draft limiting device as set forth in claim 11, wherein said restoring means is arranged so that said restoring moment is substantially constant as said flap moves over a first part of the path of movement of said flap including said closed position, and said restoring moment decreases as said flap moves toward said open position over a second part of the path of said flap including said open position. 14. A draft limiting device as set forth in claim 5, including first means arranged to move with said flap for adjusting said restoring moment to a first value when said flap is in said closed position, and second means for adjusting said restoring moment to a second value, independently of said first value, when said flap is in said open position. 15. A draft limiting device as set forth in claim 14, including a swing shaft for defining said swing axis, wherein the axis of said swing shaft is substantially horizontal, and the center of gravity of said flap and parts connected for movement with said flap including said first and second means is at substantially the same level as the axis of said swing shaft so that said restoring moment is provided by gravitational force. 16. A draft limiting device as set forth in claim 15, wherein said first means is arranged to displace said center of gravity in the horizontal direction relative to the axis of said swing shaft and when said flap is in the closed position for adjusting said first value of said restoring moment. 17. A draft limiting device as set forth in claim 16, wherein said second means is arranged to displace said center of gravity in the vertical direction relative to the axis of said swing shaft and when said flap is in the open position for adjusting said second value of said restoring moment. 18. A draft limiting device as set forth in claim 17, said first means including an elongated arm connected for movement with said flap and extending perpendicularly from said flap when said flap is in said closed position, at least one weight on said arm, said weight being arranged for adjustable movement in the longitudinal direction of said arm, and bush means fitted on said swing shaft for securing one end of said arm and fixing said arm at a desired position about the axis of said swing shaft. 19. A draft limiting device as set forth in claim 18, wherein said arm extends from the side of said flap which side faces in the direction of the room when said flap is in said closed position. 20. A draft limiting device as set forth in claim 5, including a frame arranged at said secondary air inlet, and said flap is mounted on said frame for swinging movement with respect to said frame. 21. A draft limiting device as set forth in claim 6, wherein said shield member abuts said flap along a planar surface on said shield member which surface is parallel to the center of radius of said shield member. 22. A draft limiting device as set forth in claim 12, including an elongated arm connected for movement with said flap and extending substantially horizontally from said flap when said flap is in said closed position, at least one weight on said arm, said weight being arranged for adjustable movement in the longitudinal direction of said arm, and bush means fitted on said swing shaft for securing one end of said arm and fixing said arm at a desired position about the axis of said swing shaft, said at least one weight on said arm being substantially lighter than said counterbalance weight provided by said shield member for providing fine adjustment of the center of gravity of said flap and all parts connected for movement with said flap when said at least one weight is moved in the long direction of said arm. 23. A draft limiting device as set forth in claim 12, wherein said swing shaft is fixed to said flap so that the axis of said swing shaft extends parallel to the surface of said flap, and including bearing means for engaging said swing shaft to enable the swiveling movement of said flap. 24. A draft limiting device as set forth in claim 23, wherein said bearing means comprises a number of bearing members each supported in fixed relation with respect to the secondary air inlet.
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