Method for nozzle clamping force control
First Claim
Patent Images
1. A method for controlling clamping forces in a variable primary nozzle system of a radial turbine having primary nozzles formed by pivotal nozzle vanes clamped between mounting rings having relative axial movement therebetween, comprising the steps of:
- sensing the force required to vary the primary nozzles;
opening a source of pressure when said sensed force exceeds a preselected value;
directing flow from the opened source of pressure to the nozzle vanes adjacent the mounting rings.
1 Assignment
0 Petitions
Accused Products
Abstract
A system for pressurizing cavities arranged laterally of pivotal vanes of a variable primary nozzle system in a radial turbine. The cavities are supplied with fluid of increased or reduced pressure to resist the clamping forces of the mounting rings. The fluid may conveniently be influent pressure or nozzle discharge pressure as may be appropriate. Pressure to the cavities is controlled as responsive to the pressure in the actuator system for adjusting the nozzles.
28 Citations
22 Claims
-
1. A method for controlling clamping forces in a variable primary nozzle system of a radial turbine having primary nozzles formed by pivotal nozzle vanes clamped between mounting rings having relative axial movement therebetween, comprising the steps of:
-
sensing the force required to vary the primary nozzles; opening a source of pressure when said sensed force exceeds a preselected value; directing flow from the opened source of pressure to the nozzle vanes adjacent the mounting rings. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A nozzle clamping force control for a variable primary nozzle system on a radial turbine having mounting rings mounted for relative axial movement therebetween, nozzle vanes clamped between the mounting rings, and an actuator for pivoting said nozzle vanes, comprising
cavities in the nozzle vane surfaces adjacent the rings; -
passages extending to said cavities; a source of pressure in communication with said passages; valve means for controlling flow from said source of pressure through said passages; valve control means for opening said valve means responsive to actuator force. - View Dependent Claims (7, 8)
-
-
9. A nozzle clamping force control for a variable primary nozzle system on a radial turbine having mounting rings mounted for relative axial movement therebetween, nozzle vanes clamped between the mounting rings and a fluid pressure driven actuator for pivoting said nozzle vanes, comprising
cavities in the nozzle vane surfaces adjacent the rings; -
passages extending to said cavities; a source of pressure in communication with said passages; valve means for controlling flow from said source of pressure through said passages; a valve actuator operatively coupled with said valve means; and a pressure line from the fluid pressure driven actuator to said valve actuator, said valve actuator being fluid pressure actuated and having a preselected actuation pressure.
-
-
10. A method for controlling clamping forces in a variable primary nozzle system of a radial turbine having primary nozzles formed by pivotal nozzle vanes clamped between mounting rings having relative axial movement therebetween, comprising the steps of:
-
sensing the force required to vary the primary nozzles; opening a source of pressure when said sensed force exceeds a preselected value; directing pressure from the opened source of pressure to at least one cavity laterally positioned to the nozzle vanes. - View Dependent Claims (11, 12, 13, 14)
-
-
15. A nozzle clamping force control for a variable primary nozzle system on a radial turbine having mounting rings mounted for relative axial movement therebetween, nozzle vanes clamped between the mounting rings, and an actuator for pivoting said nozzle vanes, comprising
at least one cavity laterally positioned to the nozzle vanes; -
a passage extending to said cavity; a source of pressure in communication with said passage; valve means for controlling pressure from said source of pressure through said passage; valve control means for opening said valve means responsive to actuator force. - View Dependent Claims (16, 17, 18, 19, 20, 21)
-
-
22. A nozzle clamping force control for a variable primary nozzle system on a radial turbine having mounting rings mounted for relative axial movement therebetween, nozzle vanes clamped between the mounting rings and a fluid pressure driven actuator for pivoting said nozzle vanes, comprising
a cavity laterally positioned adjacent a mounting ring on a side opposite from the nozzle vanes; -
a passage extending to said cavity; a source of pressure in communication with said passage; a valve means for controlling flow from said source of pressure through said passage; a valve actuator operatively coupled with said valve means; and a pressure line from the fluid pressure driven actuator to said valve actuator, said valve actuator being fluid pressure actuated and having a preselected actuation pressure.
-
Specification