Rotary fluid machine
First Claim
1. A rotary fluid machine comprising:
- a casing having a double-cylinder bore portion formed in said casing, a fluid inlet formed in one side of said casing communicated with said bore portion, and a fluid outlet formed in the other side of said casing opposite to said fluid inlet fluidically communicated with said bore portion through a check valve formed between said outlet and said bore portion; and
a pair of intermeshing Roots type rotors respectively mounted on a pair of shafts rotatably mounted in said double-cylinder bore portion of said casing and respectively driven by a pair of gears,each said rotor having a pair of lobe portions respectively disposed on two opposite ends of a long coordinate axis of a profile of said rotor, and a waist portion formed on a central portion of said rotor having a pair of shallow recess portions formed on two opposite sides of a short coordinate axis perpendicular to said long coordinate axis of said profile of said rotor, both said axes intersected at an origin of a center of said rotor,the improvement which comprises;
each said lobe portion of said rotor having a curvature radius r of one half of a radius R of said rotor rotatably defined in each cylinder of said double-cylinder bore portion of said casing, said cylinder of said double-cylinder bore portion having the same radius R of said rotor, each said shallow recess portion of said waist portion having a curvature radius R as same as the radius R of said rotor, of which each said recess portion is obtained by plotting an arc with the radius R around a curvature center on a line extrapolated from said short coordinate axis of said rotor, and said curvature center for plotting said recess portion having a distance of √
2 R separated from center of said rotor and also said center of said cylinder of said double-cylinder bore portion, said waist portion having a transverse thickness of 2R (√
2-1), a distance between two said centers of two said cylinders or between two centers of two said rotors intermeshed and rotatably mounted in said double-cylinder bore portion being √
2 R,whereby upon a tangential intersecting between each said shallow recess portion and each said lobe portion, a smooth rotor profile will be formed for ensuring a single-point contact between the two intermeshing rotors for a smooth running of said rotors.
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Accused Products
Abstract
A rotary fluid machine includes two intermeshing rotors rotatably mounted in a double-cylinder bore portion of a casing, each rotor having two lobe portions disposed on two opposite ends of a long coordinate axis of the rotor and having a waist portion confined by two shallow recess portions formed on two opposite sides of a short coordinate axis of the rotor so that one rotor can be smoothly rotatably engageable with the other rotor in a single-point contact for a smooth running of the two rotors. For a buffer of a higher output fluid pressure, a balancing chamber is formed between the bore portion and a fluid outlet so that a fluid suddenly increased with fluid pressure may be backflowed into the bore portion through a plurality of holes formed in a partition plate between the chamber and the bore portion for preventing water or air hammer when handling high-pressure fluid.
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Citations
5 Claims
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1. A rotary fluid machine comprising:
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a casing having a double-cylinder bore portion formed in said casing, a fluid inlet formed in one side of said casing communicated with said bore portion, and a fluid outlet formed in the other side of said casing opposite to said fluid inlet fluidically communicated with said bore portion through a check valve formed between said outlet and said bore portion; and a pair of intermeshing Roots type rotors respectively mounted on a pair of shafts rotatably mounted in said double-cylinder bore portion of said casing and respectively driven by a pair of gears, each said rotor having a pair of lobe portions respectively disposed on two opposite ends of a long coordinate axis of a profile of said rotor, and a waist portion formed on a central portion of said rotor having a pair of shallow recess portions formed on two opposite sides of a short coordinate axis perpendicular to said long coordinate axis of said profile of said rotor, both said axes intersected at an origin of a center of said rotor, the improvement which comprises; each said lobe portion of said rotor having a curvature radius r of one half of a radius R of said rotor rotatably defined in each cylinder of said double-cylinder bore portion of said casing, said cylinder of said double-cylinder bore portion having the same radius R of said rotor, each said shallow recess portion of said waist portion having a curvature radius R as same as the radius R of said rotor, of which each said recess portion is obtained by plotting an arc with the radius R around a curvature center on a line extrapolated from said short coordinate axis of said rotor, and said curvature center for plotting said recess portion having a distance of √
2 R separated from center of said rotor and also said center of said cylinder of said double-cylinder bore portion, said waist portion having a transverse thickness of 2R (√
2-1), a distance between two said centers of two said cylinders or between two centers of two said rotors intermeshed and rotatably mounted in said double-cylinder bore portion being √
2 R,whereby upon a tangential intersecting between each said shallow recess portion and each said lobe portion, a smooth rotor profile will be formed for ensuring a single-point contact between the two intermeshing rotors for a smooth running of said rotors. - View Dependent Claims (2, 3, 4, 5)
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Specification