Fluid machine

• US 6,206,668 B1
• Filed: 02/03/1998
• Issued: 03/27/2001
• Est. Priority Date: 02/07/1997
• Status: Expired due to Fees

• Current Assignee: Tochigi Fuji Sangyo Kabushiki Kaisha (Melrose Industries Plc)
• Original Assignee: Tochigi Fuji Sangyo Kabushiki Kaisha (Melrose Industries Plc)
• Inventors: Hiraishi, Kenji, Teraoka, Masao
• Primary Examiner(s): Denion, Thomas
• Assistant Examiner(s): Trieu, Theresa
• Application Number:
  US09/017,580
• Time in Patent Office: 1,148 Days
• Field of Search: 418/206.4, 418/206.1
• US Class Current: 418/206.4
• CPC Class Codes: F01C 1/126 with elements extending radially from the rotor body not necessarily cooperating with corresponding recesses in the other rotor, e.g. lobes, Roots type
• CPC Class Codes: F01C 21/106 with a radial surface, e.g. cam rings

Abstract

A fluid machine comprises a rotor (7, 9) meshed with each other in concave and convex portions (23, 26) and (25, 24), and a casing (3) enveloping these elements within cylindrical portions (43, 45) of a rotor chamber (5) and having a flow inlet port (31) and a flow outlet port (33). The cylindrical portions (43, 45) are moved to moved centers (47, 49) from standard centers (35, 37) at a predetermined distance L toward the flow inlet port (31), so that the rotor chambers (5) is expanded to cylindrical portions (55, 57) from the cylindrical portions (43, 45).

Claims

1. A fluid machine, comprising:

a pair of rotors formed with a concave portion and a convex portion in such a manner as to extend to an axial direction, the pair of rotors meshed with each other at the concave portion and the convex portion; and

a casing having a rotor chamber formed with a first pair of cylindrical portions enveloping each of the rotors, the casing having a flow inlet port and a flow outlet port for a fluid formed in the casing at a position substantially perpendicular to the axial direction of each of the rotors, the flow inlet port and the flow outlet port disposed inside two lines Y1 and Y2 which are perpendicular to a line X connecting centers of both of the cylindrical portions and pass through the center of each of the cylindrical portions, wherein,

the rotor chamber is formed with a second pair of cylindrical portions including a horizontal cross sectional shape which is constituted by a part of a circle corresponding to a second rotation track of each of the rotors, together with the first pair of cylindrical portions including a horizontal cross sectional shape which is constituted by a part of a circle corresponding to a first rotation track of each of the rotors, and

wherein the second pair of cylindrical portions are moved toward a lower pressure end among the flow inlet port and the flow outlet port from a position of the first pair of cylindrical portions at a predetermined distance L, thereby the volume of the rotor chamber is expanded, and

a first component (x) of the predetermined distance in a direction of the vertical line (X) is set to he “

x”

, a relation 0.05 (mm)≦

x≦

0.3 (mm) is made and a second component (y1, y2) of the predetermined distance in a direction perpendicular to the vertical line (X) is set to be “

y1”

or “

y2”

, a relation 0.05 (mm)≦

y1, y2≦

0.3 (mm) is made.

2. The fluid machine according to claim 1, wherein each of the rotors is rotated by a prime mover and the fluid is sucked from the flow inlet port of the casing and is discharged from the flow outlet port.

3. A pair of rotors formed with a concave portion and a convex portion in such a manner as to extend to an axial direction, the pair of rotors meshed with each other at the concave portion and the convex portion;

and

a casing having a rotor chamber formed with a first pair of cylindrical portions enveloping each of the rotors, the casing having a flow inlet port and a flow outlet port for a fluid formed in the casing at a position substantially perpendicular to the axial direction of each of the rotors, the flow inlet port and the flow outlet port disposed inside two lines Y1 and Y2 which are perpendicular to a line X connecting centers of both of the cylindrical portions and pass through the center of each of the cylindrical portions, wherein,

the rotor chamber is formed with a second pair of cylindrical portions including a horizontal cross sectional shape which is constituted by a part of a circle corresponding to a second rotation track of each of the rotors, together with the first pair of cylindrical portions including a horizontal cross sectional shape which is constituted by a part of a circle corresponding to a first rotation track of each of the rotors, and

wherein the second pair of cylindrical portions are moved toward a lower pressure end among the flow inlet port and the flow outlet port from a position of the first pair of cylindrical portions at a predetermined distance L, thereby the volume of the rotor chamber is expanded, and

wherein each of the cylindrical portions are crossed to each other so as to form a round portion having a predetermined radius r on one or both of a convex portion formed in the flow inlet port end and the flow outlet port end, and

wherein when a radius of a circle corresponding to a rotating track of each of the rotors is set to be R, and the predetermined radius of the convex formed on the cross point between the first upper and lower cylindrical portions is set to be r, a relation {fraction (1/10)}R (mm)≦

r≦

⅕

R (mm) is made.

6. The fluid machine according to claim 3, wherein each of the rotors is rotated by a prime mover and a fluid is sucked from a flow inlet port of the casing and is discharged from the flow outlet port.

5. A pair of rotors formed with a concave portion and a convex portion in such a manner as to extend to an axial direction, the pair of rotors meshed with each other at the concave portion and the convex portion;

and

a casing having a rotor chamber formed with a first pair of cylindrical portions enveloping each of the rotors, the casing having a flow inlet port and a flow outlet port for a fluid formed in the casing at a position substantially perpendicular to the axial direction of each of the rotors, the flow inlet port and the flow outlet port disposed inside two lines Y1 and Y2 which are perpendicular to a line X connecting centers of both of the cylindrical portions and pass through the center of each of the cylindrical portions, wherein,

the rotor chamber is formed with a second pair of cylindrical portions including a horizontal cross sectional shape which is constituted by a part of a circle corresponding to a second rotation track of each of the rotors, together with the first pair of cylindrical portions including a horizontal cross sectional shape which is constituted by a part of a circle corresponding to a first rotation track of each of the rotors, and

wherein the second pair of cylindrical portions are moved toward a lower pressure end among the flow inlet port and the flow outlet port from a position of the first pair of cylindrical portions at a predetermined distance L, thereby the volume of the rotor chamber is expanded, and

wherein each of the cylindrical portions are crossed to each other so as to form a round portion having a predetermined radius r on one or both of a convex portion formed in the flow inlet port end and the flow outlet port end, and

wherein the predetermined radius r is set to be a different value along an axial direction of each of the rotors.

4. The fluid machine according to claim 5, wherein each of the rotors is rotated by a prime mover and a fluid is sucked from a flow inlet port of the casing and is discharged from the flow outlet port.