Rotor for a rotary screw machine
AssigneeSvenska Rotor Maskiner AB
InventorKarlis Timuska
Life of this patent
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Abstract
A rotor for a rotary screw machine having helical lobes and intermediate grooves, the rotor having a core including a shaft 1 of a first material and a rotor body 2 of a second material mounted on the shaft. The surface of the rotor is coated with a plastic layer 3.
Claims23
In a rotor for a rotary screw machine having helical lobes and intermediate grooves forming the working surface of the rotor, the rotor being axially limited by two radial end surfaces and having a core with a coating on at least said working surface, said coating comprising at least one layer of substantially uniform thickness and being made of plastic,
- the improvement wherein:
- said core includes a shaft of a first material and a rotor body of a second material mounted on said shaft, and the coefficient of thermal expansion of said plastic is 1 to 3 times as great as that of said second material, and the coefficient of thermal expansion of said second material is 1 to 6 times as great as that of said first material.
In a rotary screw machine having a housing provided with a rotor therein, the rotor having helical lobes and intermediate grooves forming the working surface of the rotor, the rotor being axially limited by two radial end surfaces and having a core with a coating on at least said working surface, said coating comprising at least one layer of substantially uniform thickness and being made of plastic,
- the improvement wherein:
- said core includes a shaft of a first material and a rotor body of a second material mounted on said shaft, and the coefficient of thermal expansion of said plastic is 1 to 3 times as great as that of said second material, and the coefficient of thermal expansion of said second material is 1 to 6 times as great as that of said first material.
In a rotor for a rotary screw machine having helical lobes and intermediate grooves forming the working surface of the rotor, the rotor being axially limited by two radial end surfaces and having a core with a coating on at least said working surface, said coating being of substantially uniform thickness and being made of plastic,
- the improvement wherein:
- said core includes a shaft of a first material and a rotor body of a second material mounted on said shaft,
- said plastics coating consists of two layers,
- the coefficient of thermal expansion of said plastic is 1 to 3 times as great as that of said second material, and
- the coefficient of thermal expansion of said second material is 1 to 6 times as great as that of said first material.
In a rotary screw machine having a housing provided with a rotor therein, the rotor having helical lobes and intermediate grooves forming the working surface of the rotor, the rotor being axially limited by two radial end surfaces and having a core with a coating on at least said working surface, said coating being of substantially uniform thickness and being made of plastic,
- the improvement wherein:
- said core includes a shaft of a first material and a rotor body of a second material mounted on said shaft,
- said plastics coating consists of two layers,
- the coefficient of thermal expansion of said plastic is 1 to 3 times as great as that of said second material, and
- the coefficient of thermal expansion of said second material is 1 to 6 times as great as that of said first material.
Dependencies are inferred from the claim text.