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US 2008/0166247 A1Published application
Single-Shaft Vacuum Positive Displacement Pump
OwnerMichael Holzemerinventor
Life of this patent
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Abstract
A single-shaft vacuum positive displacement pump (10) comprises two pump stages (12,14) each provided with a pump rotor (13,15) and a drive motor (16). The drive motor (16) is axially arranged between the two pump stages (12,14), wherein the shaft (22) supports the pump rotors (13,15) and the motor rotor (17).
Claims12
A single-shaft vacuum positive displacement pump comprising:
- two pump stages, each stare including a pump rotor;
- and
- a drive motor said drive motor being axially arranged between said two pump stages, and a shaft supporting pump rotors of said pump stages and a motor rotor.
A pump comprising:
- a motor stator;
- a motor rotor rotatably mounted in the motor stator on a shaft, the motor rotor and the motor stator defining a fluid passage therebetween;
- a first pump stage having a rotor mounted on the shaft on one side of the rotor to pump fluid from a fluid inlet into the fluid passage between the motor rotor and the motor stator;
- and
- a second pump stage having a rotor mounted on the shaft on an opposite side of the rotor from the first pump stage rotor to pump fluid from the fluid passage between the motor rotor and the motor stator to an outlet.
2 more elements
Dependencies are inferred from the claim text.