Thrust load reliever
AssigneeCarrier Corporation
InventorsJianping Zhong, Joost J. Brasz, John J. Jacobs, Frederick L. Miller, Jr.
Life of this patent
Estimating the term…
Abstract
The area of the discharge end of a screw rotor acted on by the discharge pressure is reduced by locating a region of suction pressure acting on the discharge end of the rotor and separating the suction and discharge pressures by a labyrinth seal located between the discharge end of the rotor and the facing housing structure.
Claims19
In a multi-rotor screw machine having a housing, a rotor located in said housing, said rotor having a rotor profile, a rotor profile root diameter, first and seconds ends with said first end exposed to low pressure in said housing, said second end having a running clearance with said housing and being exposed to high pressure radially outward of said rotor profile root diameter, said rotor profile extending between said first and second ends, structure for relieving thrust on said rotor comprising:
- a chamber at low pressure located radially inward of said rotor profile root diameter and at least partially formed by said second end;
- and
- seal structure coacting with one of said housing and said second end to define a further restriction and thereby a seal between said running clearance and said chamber.
In a multi-rotor screw machine having a housing, a suction chamber, a rotor located in said housing, said rotor having a rotor profile root diameter and first and second ends with said first end exposed to low pressure in said housing, said second end having a running clearance with said housing and being exposed to high pressure radially outward of said rotor profile root diameter. structure for relieving thrust on said rotor comprising:
- a chamber at low pressure fluidly connected to said suction chamber and located radially inward of said rotor profile root diameter and at least partially formed by said second end;
- and
- seal structure coacting with one of said housing and said second end to define a further restriction and thereby a seal between said running clearance and said chamber at low pressure.
In a multi-rotor screw machine having a housing, a rotor located in said housing, said rotor having a rotor profile root diameter and first and second ends with said first end exposed to low pressure in said housing, said second end having a running clearance with said housing and being exposed to high pressure radially outward of said rotor profile root diameter, structure for relieving thrust on said rotor comprising:
- a chamber at low pressure located radially inward of said rotor profile root diameter and at least partially formed by said second end;
- and
- seal structure located radially outward of said chamber and coacting with one of said housing and said second end to define a further restriction and thereby a seal between said running clearance and said chamber.
Dependencies are inferred from the claim text.