ROOTS TYPE FLUID MACHINE
First Claim
1. A roots type fluid machine comprising:
- a housing;
a pair of parallel rotary shafts rotatably supported by the housing;
a two-lobe rotor disposed on each rotary shaft in a rotor chamber of the housing so that the rotors engage with each other, each of the rotors comprising;
two lobe portions each having a profile of convex arc with a radius R; and
two well portions each having a profile of concave arc which is an envelope of the convex arc of the lobe portion, wherein the rotor has a configuration defined by a curve which includes the convex arc, the concave arc and further an involute curve with a base radius r between the convex and concave arcs, wherein the base radius r is set in a range L/(2√
{square root over ( )}2)<
r<
0.3(√
{square root over ( )}2)L where distance between axes of the rotary shafts is L, and the radius R is set in a range {(√
{square root over ( )}2)/16}π
L<
R<
{(27−
5√
{square root over ( )}2)/56}L.
1 Assignment
0 Petitions
Accused Products
Abstract
A roots type fluid machine includes a housing, a pair of parallel rotary shafts and two-lobe rotors. Each rotor includes two lobe portions and two well portions. Each lobe portion has a profile of convex arc with a radius R and each well portion has a profile of concave arc which is an envelope of the convex arc of the lobe portion. The rotor has a configuration defined by a curve which includes the convex arc, the concave arc and further an involute curve with a base radius r between the convex and concave arcs. The base radius r is set in a range L/(2√{square root over ( )}2)<r<0.3(√{square root over ( )}2)L where distance between axes of the rotary shafts is L, and the radius R is set in a range {(√{square root over ( )}2)/16}πL<R<{(27−5√{square root over ( )}2)/56}L.
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Citations
10 Claims
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1. A roots type fluid machine comprising:
-
a housing;
a pair of parallel rotary shafts rotatably supported by the housing;
a two-lobe rotor disposed on each rotary shaft in a rotor chamber of the housing so that the rotors engage with each other, each of the rotors comprising;
two lobe portions each having a profile of convex arc with a radius R; and
two well portions each having a profile of concave arc which is an envelope of the convex arc of the lobe portion, wherein the rotor has a configuration defined by a curve which includes the convex arc, the concave arc and further an involute curve with a base radius r between the convex and concave arcs, wherein the base radius r is set in a range L/(2√
{square root over ( )}2)<
r<
0.3(√
{square root over ( )}2)L where distance between axes of the rotary shafts is L, and the radius R is set in a range {(√
{square root over ( )}2)/16}π
L<
R<
{(27−
5√
{square root over ( )}2)/56}L. - View Dependent Claims (2, 3, 4)
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5. A two-lobe rotor for use in a roots type fluid machine which includes a housing and a pair of parallel rotary shafts rotatably supported by the housing, the rotor being disposed on each rotary shaft in a rotor chamber of the housing so that the rotors engage with each other, each of the rotors comprising:
-
two lobe portions each having a profile of convex arc with a radius R; and
two well portions each having a profile of concave arc which is an envelope of the convex arc of the lobe portion, wherein the rotor has a configuration defined by a curve which includes the convex arc, the concave arc and further an involute curve with a base radius r between the convex and concave arcs, wherein the base radius r is set in a range L/(2√
{square root over ( )}2)<
r<
0.3(√
{square root over ( )}2)L where distance between axes of the rotary shafts is L, and the radius R is set in a range {(√
{square root over ( )}2)/16}π
L<
R<
{(27−
5√
{square root over ( )}2)/56}L.
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6. A roots type fluid machine comprising:
-
a housing;
a pair of parallel rotary shafts rotatably supported by the housing;
a three-lobe rotor disposed on each rotary shaft in a rotor chamber of the housing so that the rotors engage with each other, each of the rotors comprising;
three lobe portions each having a profile of convex arc with a radius R; and
three well portions each having a profile of concave arc which is an envelope of the convex arc of the lobe portion, wherein the rotor has a configuration defined by a curve which includes the convex arc, the concave arc and further an involute curve with a base radius r between the convex and concave arcs, wherein the base radius r is set in a range L/(2√
{square root over ( )}2)<
r<
1.35L where distance between axes of the rotary shafts is L, and the radius R is set in a range π
/(12√
{square root over ( )}2)L<
R<
0.25L. - View Dependent Claims (7, 8, 9)
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10. A three-lobe rotor for use in a roots type fluid machine which includes a housing and a pair of parallel rotary shafts rotatably supported by the housing, the rotor being disposed on each rotary shaft in a rotor chamber of the housing so that the rotors engage with each other, each of the rotors comprising:
-
three lobe portions each having a profile of convex arc with a radius R; and
three well portions each having a profile of concave arc which is an envelope of the convex arc of the lobe portion, wherein the rotor has a configuration defined by a curve which includes the convex arc, the concave arc and further an involute curve with a base radius r between the convex and concave arcs, wherein the base radius r is set in a range L/(2√
{square root over ( )}2)<
r<
1.35L where distance between axes of the rotary shafts is L, and the radius R is set in a range π
/(12√
{square root over ( )}2)L<
R<
0.25L.
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Specification