Optimized helix angle rotors for roots-style supercharger
AssigneeEaton Corporation
InventorMatthew G. Swartzlander
Life of this patent
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Abstract
A Roots-type blower has first and second meshed, lobed rotors disposed in first and second chambers of a housing. Each lobe has first and second axially facing end surfaces defining a twist angle that is a function, at least partially, of the number of lobes on each rotor, and each lobe further defines a helix angle that is a function of the twist angle and an axial length between the first and second axially facing end surfaces of said lobe. The lobes cooperate with an adjacent surface of the housing to define at least one blowhole that defines a control volume, occurs in a cyclic manner, and moves linearly in a direction toward the outlet port. The blowhole provides communication between adjacent control volumes.
Claims19
A Roots blower comprising:
- a plurality of rotors having a plurality of lobes, each lobe having a length, a twist angle, and a helix angle;
- a blower housing comprising:
- at least two overlapping cylindrical rotor chambers, the chambers extending axially between a first end wall and a second end wall and radially between a top portion and a bottom portion, the second end wall being closer to a pulley than the first end wall;
- an axial inlet port in the first end wall;
- a radial outlet port in the top side, the radial outlet port being closer to the second end wall than the first end wall;
- a plurality of cyclically occurring internal backflow passages configured to permit a continuous backflow event.
An internally compressing Roots blower comprising:
- a plurality of rotors having a plurality of lobes, each lobe having a length, a twist angle, and a helix angle;
- a blower housing comprising:
- at least two overlapping cylindrical rotor chambers, the chambers extending axially between a first end wall and second end wall and radially between a top portion and a bottom portion, the second end wall being closer to a pulley than the first end wall;
- an axial inlet port in the first end wall;
- a radial outlet port in the top side closer to the second end wall than the first end wall;
- wherein the rotors and the blower housing are configured to create dynamic internal fluid compression;
- wherein the dynamic internal fluid compression occurs when the rotors are rotating at a first rotational speed and does not occur when the rotors are rotating at a second rotational speed.
A Roots blower comprising:
- a plurality of rotors having a plurality of lobes, each lobe having an ideal twist angle of at least 150 degrees, and a helix angle of at least 25 degrees, the ideal twist angle corresponding to a maximum seal time;
- a blower housing comprising:
- at least two overlapping cylindrical rotor chambers, the chambers extending axially between a first end wall and second end wall and radially between a top portion and a bottom portion, the second end wall being closer to a pulley than the first end wall;
- an axial inlet port in the first end wall;
- a radial outlet port in the top side closer to the second end wall than the first end wall.
Dependencies are inferred from the claim text.