Rotary machine having screw rotor assembly
First Claim
1. A rotary machine having screw rotor assembly comprising a casing having an inner peripheral wall formed by two intersecting cylindrical wall surfaces whose axes are in parallel with each other and two end walls disposed vertically with respect to said axes at each axial end of said inner peripheral wall for forming a closed space in said casing, a male rotor having helical protrusions in the outer periphery thereof and a female rotor having helical concaves in the outer periphery thereof for receiving said protrusions of said mail rotor, said male and female rotors being disposed within said closed space formed in said casing to be rotatable and meshed with each other and an inlet and an outlet ports formed in said casing connected with said closed space formed in said casing, respectively, whereby a compressible fluid introduced in an acting space formed by both said rotors and inner peripheral walls of said casing through said inlet port is compressed or expanded during the rotation of said rotors and is discharged from said outlet port, characterized in that,a contour line of a tooth profile in a plane perpendicular to a rotating axis of said female rotor is such that a major concave portion except an addundum (Af) formed outside a pitch circle of meshing rotation with the male rotor is formed inside said pitch circle and a contour line of a tooth profile in a plane perpendicular to a rotating axis of said male rotor is such that a major portion except a dedendum (Dm) formed inside a pitch circle of meshing rotation with the female rotor is formed outside said pitch circle;
- the tooth profile of the female rotor is formed such that a first portion (G2 -H2) connecting two outermost points (G2) and (H2) located on tip of said addendum (Af) is formed by a circular arc having a radius equal to the outer diameter of said female rotor and a center of the arc being located at a rotating axis of said female rotor;
a second portion (H2 -A2) connecting said point (H2) and a point (A2) located on the pitch circle of said female rotor is generated by a point (A1) located on the pitch circle of the male rotor tooth profile;
a third portion (A2 -B2) connecting said point (A2) and a point (B2) is formed by a convex circular arc having a radius (R7) and a center (O7) of the arc being located on a line tangent to the pitch circle of the female rotor at said point (A2) and outside the tooth profile of the female rotor;
a fourth portion (B2 -C2) connecting said point (B2) and a point (C2) is formed by an envelope developed by a circular arc (B1 -C1) which is a portion of the tooth profile of the male rotor;
a fifth portion (D2 -E2) connecting points (D2) and (E2) is formed by a concave circular arc having a radius (R1) and center (O1) of the arc being located on a line (3-4) connecting the rotation centers (3) and (4) of the male and female rotors and outside the pitch circle of the female rotor;
a sixth portion (C2 -D2) connecting said points (C2) and (D2) is formed by a common tangent or similar concave curve of said fourth portion (B2 -C2) and fifth portion (D2 -E2);
a seventh portion (E2 -F2) connecting said point (E2) and a point (F2) is formed a convex circular arc having a radius (R2) and a center (O2) of the arc being located on an extension of line (O1 -E2) intersecting at an angle (θ
1) with said line (3-4) at a position opposite to the center (O1) of the fifth portion (D2 -E2) with respect to the point (E2) and an eighth portion (F2 -G2) is formed by convex circular arc having a radius (R8) and a center (O8) of the arc being located on a line connecting said center (O2) of said seventh portion (E2 -F2) and said point (F2);
the tooth profile of the male rotor is formed such that a first portion (H1 -A1) connecting a point H1 located on a bottom land (G1 -H1) of the dedendum (Dm) and the point (A1) located on the pitch circle of the male rotor is a generated curve of the point H2 located on the female rotor tooth profile;
a second portion (A1 -B1) connecting said point (A1) and a point (B1) is formed by an envelope developed by said the arc of said third portion (A2 -B2) of the female rotor tooth profile;
a third portion (B1 -C1) connecting said point (B1) and a point (C1) is formed by a convex circular arc having a radius (R4) and a center (O4) of the arc being located on a line (3-O4) intersecting at an angle (θ
5) with said line (3-4) connecting the rotating centers (3) and (4) of said male and female rotors and at a predetermined distance apart from said line (3-4);
a fourth portion (E'"'"'1 -E1) connecting points (E'"'"'1) and (E1) is formed by an envelope developed by said arc of said fifth portion (D2 -E2) of the female rotor tooth profile;
a fifth portion (E1 -F1) is formed by an envelope developed by said seventh portion (E2 -F2) of the female rotor tooth profile, a sixth portion (F1 -G1) is formed by an envelope developed by said eighth portion (F2 -G2) of the female rotor tooth profile and a seventh portion (C1 -E'"'"'1 ) is formed such that a portion (E'"'"'1 -D3) connecting said point (E'"'"'1) and a point (D3) is formed by a convex circular arc having a radius (R6) and a center (O6) of the arc being located on a line (3-O6) intersecting at an angle (θ
6) with said line (3-4) which is tangent to said fourth portion (E'"'"'1 -E1) at the point (E'"'"'1);
a portion (C1 -WL1) connecting said point (C1) and a point (WL1) located at a predetermined distance apart from said line (3-4) and on the same side with the point (C1) with respect to said line (3-4) which is tangent to said third portion (B1 -C1) at the point (C1);
a portion (D3 -WL2) connecting said point (D3) and point (WL2) located at a predetermined distance apart from said line (3-4) and on the same side with the point (D3) with respect to said line (3-4) which is tangent to said circular arc (E'"'"'1 -D3) at the point (D3);
a portion (WD1 -WD2) connecting two points (WD1) and (WD2) located on a circular arc having similar radius with the outer radius of the male rotor and a center of the arc being located on the rotating center of the male rotor and located opposite positions with resepct to said line (3-4) is formed by a line intersecting said line (3-4), and line (WD1 -WL1) connecting said points (WD1) and (WL1) and line (WD2 -WL2) connecting said points (WD2) and (WL2), respectively, are formed by a line whereby a seal strip portion formed by said portions (C1 -WL1), (WD1 -WL1), (WD1 -WD2), (WD2 -WL2) and (D3 -WL2) is provided on the tip of the male rotor tooth profile.
1 Assignment
0 Petitions
Accused Products
Abstract
Rotary machine such as rotary compressor or expander having meshed male and female rotor assembly. The tooth profile of the female rotor is formed such that a line (H2 -A2) is formed by a generated curve of a point A1 of the male rotor; a line (A2 -B2) is formed by a circular arc having a point O7 as the center of the arc and a radius R7 ; a curve (B2 -C2) is formed by an envelope developed by a circular arc (B1 -C1) of the male rotor; a portion between points D2 and E2 is formed by a circular arc having a point O1 as the center of the arc and a radius R1 ; a line (C2 -D2) is formed by a line smoothly connecting the curves (B2 -C2) and (D2 -E2); a curve (E2 -F2) is formed by a circular arc having a point O2 as the center of the arc and a radius R2 ; and a curve (F2 -G2) is formed by a circular arc having a point O8 as the center of the arc and a radius R8. The tooth profile of the male rotor is formed such that a curve (H1 -A1) is formed by a generated curve of a point H2 of the female rotor; a curve (A1 -B1) is formed by an envelope developed by the arc (A2 -B2) of the female rotor; a curve (B1 -C1) is formed by a circular arc having a point O4 as the center of the arc and a radius R4 ; a curve (D3 -E'"'"'1) is a circular arc having a point O6 as the center of the arc and a radius R6 ; a curve (E1 '"'"'-E1) is an envelope developed by an arc (D2 -E2) of the female rotor; curves (E1 -F1) and (F1 -G1) are generated by arcs (E2 -F2) and (F2 -G2) of the female rotor tooth profile, respectively, and a seal strip is formed between points C1 and D3.
11 Citations
3 Claims
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1. A rotary machine having screw rotor assembly comprising a casing having an inner peripheral wall formed by two intersecting cylindrical wall surfaces whose axes are in parallel with each other and two end walls disposed vertically with respect to said axes at each axial end of said inner peripheral wall for forming a closed space in said casing, a male rotor having helical protrusions in the outer periphery thereof and a female rotor having helical concaves in the outer periphery thereof for receiving said protrusions of said mail rotor, said male and female rotors being disposed within said closed space formed in said casing to be rotatable and meshed with each other and an inlet and an outlet ports formed in said casing connected with said closed space formed in said casing, respectively, whereby a compressible fluid introduced in an acting space formed by both said rotors and inner peripheral walls of said casing through said inlet port is compressed or expanded during the rotation of said rotors and is discharged from said outlet port, characterized in that,
a contour line of a tooth profile in a plane perpendicular to a rotating axis of said female rotor is such that a major concave portion except an addundum (Af) formed outside a pitch circle of meshing rotation with the male rotor is formed inside said pitch circle and a contour line of a tooth profile in a plane perpendicular to a rotating axis of said male rotor is such that a major portion except a dedendum (Dm) formed inside a pitch circle of meshing rotation with the female rotor is formed outside said pitch circle; -
the tooth profile of the female rotor is formed such that a first portion (G2 -H2) connecting two outermost points (G2) and (H2) located on tip of said addendum (Af) is formed by a circular arc having a radius equal to the outer diameter of said female rotor and a center of the arc being located at a rotating axis of said female rotor;
a second portion (H2 -A2) connecting said point (H2) and a point (A2) located on the pitch circle of said female rotor is generated by a point (A1) located on the pitch circle of the male rotor tooth profile;
a third portion (A2 -B2) connecting said point (A2) and a point (B2) is formed by a convex circular arc having a radius (R7) and a center (O7) of the arc being located on a line tangent to the pitch circle of the female rotor at said point (A2) and outside the tooth profile of the female rotor;
a fourth portion (B2 -C2) connecting said point (B2) and a point (C2) is formed by an envelope developed by a circular arc (B1 -C1) which is a portion of the tooth profile of the male rotor;
a fifth portion (D2 -E2) connecting points (D2) and (E2) is formed by a concave circular arc having a radius (R1) and center (O1) of the arc being located on a line (3-4) connecting the rotation centers (3) and (4) of the male and female rotors and outside the pitch circle of the female rotor;
a sixth portion (C2 -D2) connecting said points (C2) and (D2) is formed by a common tangent or similar concave curve of said fourth portion (B2 -C2) and fifth portion (D2 -E2);
a seventh portion (E2 -F2) connecting said point (E2) and a point (F2) is formed a convex circular arc having a radius (R2) and a center (O2) of the arc being located on an extension of line (O1 -E2) intersecting at an angle (θ
1) with said line (3-4) at a position opposite to the center (O1) of the fifth portion (D2 -E2) with respect to the point (E2) and an eighth portion (F2 -G2) is formed by convex circular arc having a radius (R8) and a center (O8) of the arc being located on a line connecting said center (O2) of said seventh portion (E2 -F2) and said point (F2);the tooth profile of the male rotor is formed such that a first portion (H1 -A1) connecting a point H1 located on a bottom land (G1 -H1) of the dedendum (Dm) and the point (A1) located on the pitch circle of the male rotor is a generated curve of the point H2 located on the female rotor tooth profile;
a second portion (A1 -B1) connecting said point (A1) and a point (B1) is formed by an envelope developed by said the arc of said third portion (A2 -B2) of the female rotor tooth profile;
a third portion (B1 -C1) connecting said point (B1) and a point (C1) is formed by a convex circular arc having a radius (R4) and a center (O4) of the arc being located on a line (3-O4) intersecting at an angle (θ
5) with said line (3-4) connecting the rotating centers (3) and (4) of said male and female rotors and at a predetermined distance apart from said line (3-4);
a fourth portion (E'"'"'1 -E1) connecting points (E'"'"'1) and (E1) is formed by an envelope developed by said arc of said fifth portion (D2 -E2) of the female rotor tooth profile;
a fifth portion (E1 -F1) is formed by an envelope developed by said seventh portion (E2 -F2) of the female rotor tooth profile, a sixth portion (F1 -G1) is formed by an envelope developed by said eighth portion (F2 -G2) of the female rotor tooth profile and a seventh portion (C1 -E'"'"'1 ) is formed such that a portion (E'"'"'1 -D3) connecting said point (E'"'"'1) and a point (D3) is formed by a convex circular arc having a radius (R6) and a center (O6) of the arc being located on a line (3-O6) intersecting at an angle (θ
6) with said line (3-4) which is tangent to said fourth portion (E'"'"'1 -E1) at the point (E'"'"'1);
a portion (C1 -WL1) connecting said point (C1) and a point (WL1) located at a predetermined distance apart from said line (3-4) and on the same side with the point (C1) with respect to said line (3-4) which is tangent to said third portion (B1 -C1) at the point (C1);
a portion (D3 -WL2) connecting said point (D3) and point (WL2) located at a predetermined distance apart from said line (3-4) and on the same side with the point (D3) with respect to said line (3-4) which is tangent to said circular arc (E'"'"'1 -D3) at the point (D3);
a portion (WD1 -WD2) connecting two points (WD1) and (WD2) located on a circular arc having similar radius with the outer radius of the male rotor and a center of the arc being located on the rotating center of the male rotor and located opposite positions with resepct to said line (3-4) is formed by a line intersecting said line (3-4), and line (WD1 -WL1) connecting said points (WD1) and (WL1) and line (WD2 -WL2) connecting said points (WD2) and (WL2), respectively, are formed by a line whereby a seal strip portion formed by said portions (C1 -WL1), (WD1 -WL1), (WD1 -WD2), (WD2 -WL2) and (D3 -WL2) is provided on the tip of the male rotor tooth profile. - View Dependent Claims (2, 3)
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Specification
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- Resources
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Current AssigneeHokuetsu Industries Co., Ltd.
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Original AssigneeHokuetsu Industries Co., Ltd.
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InventorsKanai, Junichi, Maehara, Atsushi, Tanaka, Masanori
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Primary Examiner(s)Croyle, Carlton R.
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Assistant Examiner(s)Obee, Jane E.
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Application NumberUS06/878,800Time in Patent Office383 DaysField of Search418/150, 418/201, 74/424.5, 74/458US Class Current418/201.3CPC Class CodesF01C 1/084 Toothed wheels
