A flow regulation vent includes a fixed portion adapted to engage a gas supply conduit and a spring force biased movable portion connected by a hinge to the fixed portion and flowingly connected to the pressurized gas supply. The fixed portion includes a gas flow orifice. The movable portion is pivo
A flow regulation vent includes a fixed portion adapted to engage a gas supply conduit and a spring force biased movable portion connected by a hinge to the fixed portion and flowingly connected to the pressurized gas supply. The fixed portion includes a gas flow orifice. The movable portion is pivotally movable between 1) a relaxed position, whereby at a specified minimum operating pressure, the movable portion is pivoted by the spring force away from the fixed portion to a position to establish a first gas washout flow area between the movable portion and the gas flow orifice; and 2) a fully pressurized position, whereby at a specified maximum operating pressure, the pressurized gas offsets the spring force to pivot the movable portion to a position adjacent the fixed portion to establish a minimum gas washout flow area between the movable portion and the gas flow orifice.
대표청구항▼
1. A flow regulation vent for venting washout gas to atmosphere and for regulating flow from a pressurized gas supply, comprising: a housing having a vent orifice and a curved surface at least partially surrounding the vent orifice; anda spring force biased flap adapted to be flowingly connected to
1. A flow regulation vent for venting washout gas to atmosphere and for regulating flow from a pressurized gas supply, comprising: a housing having a vent orifice and a curved surface at least partially surrounding the vent orifice; anda spring force biased flap adapted to be flowingly connected to the pressurized gas supply, the flap having a first portion connected to the housing and a movable portion pivoted by the spring force away from the housing in a relaxed state to establish a first gas washout flow area between the flap and the vent orifice; whereby, an increase in a pressure of the pressurized gas supply progressively offsets the spring force of the flap to move an increasing portion of the movable flap portion into contact with the curved surface of the housing to decrease the gas washout flow area between the flap and the vent orifice,wherein the first portion of the flap connected to the housing is a first end of the flap and the movable portion of the flap is outboard of the first end of the flap. 2. A flow regulation vent as in claim 1, wherein the housing is in the form of a cover to cover a vent chamber housing flowingly connected to the pressurized gas supply. 3. A flow regulation vent as in claim 2, wherein the vent chamber housing is attached to a swivel elbow joint for interconnecting the pressurized gas supply and a mask for supplying the pressurized gas to a human. 4. A flow regulation vent as in claim 1, wherein a radius of curvature of the curved surface is greater than 21 mm. 5. A flow regulation vent as in claim 4, wherein the radius of curvature of the curved surface is between 26 and 41 mm. 6. A flow regulation vent as in claim 5, wherein the radius of curvature of the curved surface is approximately 35 mm. 7. A flow regulation vent as in claim 5, wherein a deflection angle of the movable portion of the flap is between 15 and 25 degrees. 8. A flow regulation vent as in claim 1, wherein the flap is constructed of polyester film. 9. A flow regulation vent as in claim 1, wherein the housing is removably attachable to at least one flow port of a mask for supplying the pressurized gas to a human. 10. A flow regulation vent as in claim 1, and further comprising a mask for supplying the pressurized gas to a human, the flow regulation vent being connected to the mask. 11. A flow regulation vent as in claim 1, and further including a diffuser positioned between the pressurized gas supply and the flap to diffuse gas flow to the flap. 12. A flow regulation vent as in claim 1, wherein a width of the vent orifice changes at at least one change point on the housing positioned between the first portion and the movable portion of the flap. 13. A flow regulation vent as in claim 12, wherein the width of the vent orifice decreases at the at least one change point. 14. A flow regulation vent as in claim 13, wherein the width of the vent orifice decreases more than once. 15. A flow regulation vent as in claim 13, wherein a thickness of the flap decreases at at least one change point on the movable portion of the flap. 16. A flow regulation vent as in claim 1, wherein a thickness of the flap changes at at least one change point on the movable portion of the flap. 17. A flow regulation vent as in claim 16, wherein the thickness of the flap decreases at the at least one change point. 18. A flow regulation vent as in claim 17, wherein the thickness of the flap decreases more than once. 19. A flow regulation vent for venting washout gas to atmosphere and for regulating flow from a pressurized gas supply, comprising: a housing having a vent orifice and a curved surface at least partially surrounding the vent orifice; anda spring force biased flap adapted to be flowingly connected to the pressurized gas supply, the flap having a first portion connected to the housing and a movable portion pivoted by the spring force away from the housing in a relaxed state to establish a first gas washout flow area between the flap and the vent orifice; whereby, an increase in a pressure of the pressurized gas supply progressively offsets the spring force of the flap to move an increasing portion of the movable flap portion into contact with the curved surface of the housing to decrease the gas washout flow area between the flap and the vent orifice,wherein the vent orifice has a rectangular cross-section. 20. A flow regulation vent for venting washout gas to atmosphere and for regulating flow from a pressurized gas supply, comprising: a housing having a vent orifice and a curved surface at least partially surrounding the vent orifice; anda spring force biased flap adapted to be flowingly connected to the pressurized gas supply, the flap having a first portion connected to the housing and a movable portion pivoted by the spring force away from the housing in a relaxed state to establish a first gas washout flow area between the flap and the vent orifice; whereby, an increase in a pressure of the pressurized gas supply progressively offsets the spring force of the flap to move an increasing portion of the movable flap portion into contact with the curved surface of the housing to decrease the gas washout flow area between the flap and the vent orifice,wherein the vent orifice comprises a plurality of individual orifices spaced apart from each other and the increasing portion of the movable flap portion moved into contact with the curved surface progressively closes an increasing number of the individual orifices. 21. A flow regulation vent for venting washout gas to atmosphere and for regulating flow from a pressurized gas supply, comprising: a housing having a vent orifice and a curved surface at least partially surrounding the vent orifice;a spring force biased flap adapted to be flowingly connected to the pressurized gas supply, the flap having a first portion connected to the housing and a movable portion pivoted by the spring force away from the housing in a relaxed state to establish a first gas washout flow area between the flap and the vent orifice; whereby, an increase in a pressure of the pressurized gas supply progressively offsets the spring force of the flap to move an increasing portion of the movable flap portion into contact with the curved surface of the housing to decrease the gas washout flow area between the flap and the vent orifice; anda fixed bleed orifice adapted to provide a minimum gas flow to the atmosphere when the vent orifice is closed. 22. A flow regulation vent for venting washout gas to atmosphere and for regulating flow from a pressurized gas supply, comprising: a housing having a vent orifice and a curved surface at least partially surrounding the vent orifice; anda spring force biased flap adapted to be flowingly connected to the pressurized gas supply, the flap having a first portion connected to the housing and a movable portion pivoted by the spring force away from the housing in a relaxed state to establish a first gas washout flow area between the flap and the vent orifice; whereby, an increase in a pressure of the pressurized gas supply progressively offsets the spring force of the flap to move an increasing portion of the movable flap portion into contact with the curved surface of the housing to decrease the gas washout flow area between the flap and the vent orifice,wherein a radius of curvature of the curved surface changes at at least one change point on the housing positioned between the first portion and the movable portion of the flap. 23. A flow regulation vent as in claim 22, wherein the radius of curvature of the curved surface increases at the at least one change point. 24. A flow regulation vent as in claim 23, wherein the radius of curvature of the curved surface increases more than once. 25. A flow regulation vent as in claim 23, wherein a width of the vent orifice decreases at at least one change point on the housing positioned between the first portion and the movable portion of the flap. 26. A flow regulation vent as in claim 25, wherein a thickness of the flap decreases at at least one change point on the movable portion of the flap. 27. A flow regulation vent for venting washout gas to atmosphere and for regulating flow from a pressurized gas supply, comprising: a housing having a vent orifice and a curved surface at least partially surrounding the vent orifice; anda spring force biased flap adapted to be flowingly connected to the pressurized gas supply, the flap having a first side adapted to face the pressurized gas supply, an opposite second side facing the vent orifice, two end portions engaging the housing and a central movable portion pivoted by the spring force away from the vent orifice in a relaxed state to establish a first gas washout flow area between the flap and the vent orifice; whereby, an increase in a pressure of the pressurized gas supply progressively offsets the spring force of the flap to move the central movable portion of the flap toward the vent orifice to decrease the gas washout flow area between the flap and the vent orifice for the pressurized gas flowing from the first side of the flap to the second side of the flap and through the vent orificewherein the vent orifice comprises a plurality of individual orifices spaced apart from each other. 28. A flow regulation vent as in claim 27, wherein the vent orifice has a rectangular cross-section. 29. A flow regulation vent as in claim 27, wherein the housing is in the form of a cover to cover a vent chamber housing flowingly connected to the pressurized gas supply. 30. A flow regulation vent as in claim 29, wherein the vent chamber housing is attached to a swivel elbow joint for interconnecting the pressurized gas supply and a mask for supplying the pressurized gas to a human. 31. A flow regulation vent as in claim 27, wherein a radius of curvature of the curved surface is greater than 21 mm. 32. A flow regulation vent as in claim 31, wherein the radius of curvature of the curved surface is between 26 and 41 mm. 33. A flow regulation vent as in claim 32, wherein the radius of curvature of the curved surface is approximately 35 mm. 34. A flow regulation vent as in claim 33, wherein a deflection angle of the movable portion of the flap is between 15 and 25 degrees. 35. A flow regulation vent as in claim 27, wherein the flap is constructed of polyester film. 36. A flow regulation vent as in claim 27, and further including a fixed bleed orifice to provide a minimum gas flow to the atmosphere when the vent orifice is closed. 37. A flow regulation vent as in claim 27, wherein the housing is removably attachable to at least one flow port of a mask for supplying the pressurized gas to a human. 38. A flow regulation vent as in claim 27, and further including a diffuser positioned between the pressurized gas supply and the flap to diffuse gas flow to the flap. 39. A flow regulation vent as in claim 27, and further comprising a mask for supplying the pressurized gas to a human, the flow regulation vent being connected to the mask. 40. A mask for supplying breathable gas pressurized above atmospheric pressure to a human, the mask comprising: a shell adapted to cover at least one of the human's mouth and the human's nostrils;a gas supply conduit flowingly connected to the shell and adapted to be connected to a pressurized gas supply; anda flow regulation vent including:a housing adapted to be connected to one of the shell and the gas supply conduit, the housing having a vent orifice and a curved surface at least partially surrounding the vent orifice; anda spring force biased flap adapted to be flowingly connected to the pressurized gas supply, the flap having a first portion connected to the housing and a movable portion pivoted by the spring force away from the housing in a relaxed state to establish a first gas washout flow area between the flap and the vent orifice; whereby, an increase in a pressure of the pressurized gas supply progressively offsets the spring force of the flap to move an increasing portion of the movable flap portion into contact with the curved surface of the housing to decrease the gas washout flow area between the flap and the vent orifice,wherein the flap is constructed of polyester film. 41. A mask for supplying breathable gas pressurized above atmospheric pressure to a human, the mask comprising: a shell adapted to cover at least one of the human's mouth and the human's nostrils;a gas supply conduit flowingly connected between the shell and a pressurized gas supply; anda flow regulation vent including: a housing connected to one of the shell and the gas supply conduit, the housing having a vent orifice and a curved surface at least partially surrounding the vent orifice; anda spring force biased flap flowingly connected to the pressurized gas supply, the flap having a first side facing the pressurized gas supply, an opposite second side facing the vent orifice, two end portions engaging the housing and a central movable portion pivoted by the spring force away from the vent orifice in a relaxed state to establish a first gas washout flow area between the flap and the vent orifice; whereby, an increase in a pressure of the pressurized gas supply progressively offsets the spring force of the flap to move the central movable portion of the flap toward the vent orifice to decrease the gas washout flow area between the flap and the vent orifice for the pressurized gas flowing from the first side of the flap to the second side of the flap and through the vent orifice,wherein the flap is constructed of polyester film.
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이 특허에 인용된 특허 (16)
Starr John R. (Leechburg PA) Starr Eric W. (Pittsburgh PA) Kaigler William (N. Huntingdon PA) Pujol John R. (Pittsburgh PA) Devinney Pat (Pittsburgh PA) Serowski Andrew (Pittsburgh PA), Automatic safety valve and diffuser for nasal and/or oral gas delivery mask.
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