Fluid pump having a pressure sealed motor chamber
OwnerGotz Heidelberg, Peter Ehrhart +2inventors
InventorsGotz Heidelberg, Peter Ehrhart, Otto W. Stuckmann, Roland Fischer
Life of this patent
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Abstract
A pump of compact design, which is hermetically sealed to the outside and has no shaft lead-outs to the outside, includes a housing with an internal partition dividing the inside of the housing into a drive section and a pump section. A single shaft, which is supported in the partition, carries on one side the rotor of an electric drive motor and on the other side the impeller of the pump. In the cavity of the drive section, a gas pressure is generated which assists in preventing the pumping material from passing into the drive section.
Claims22
A fluid pump comprising:
- a hermetically sealed housing;
- a partition located within said housing and having a passage bore therethrough;
- a drive section formed within said housing and defining a cavity containing a gas having a specific pressure, said drive section comprising an electric drive motor located within the cavity, said electric drive motor including:
- a stator;
- a drive shaft extending through the passage bore of said partition and being located entirely within said housing;
- and
- a cup-shaped rotor externally located relative to said stator and having a rotor bottom located on a side of said partition and connected to said drive shaft, and being supported in a cantilevered manner by said partition;
- whereby said motor is subject to an excitation caused by permanent magnets and to electronic commutation of a stator current;
- and
- a pump section formed within said housing and being separated from said drive section by said partition, and comprising an impeller mounted on said drive shaft.
A fluid pump comprising:
- a hermetically sealed housing having an end wall member;
- a partition located within said housing and having a passage bore therethrough;
- a drive section formed within said housing and defining a cavity containing a gas having a specific pressure, said drive section comprising an electric drive motor located within the cavity, said electric drive motor including:
- a stator;
- a drive shaft extending through the passage bore of said partition and being located entirely within said housing, said drive shaft being supported by said end wall member at a location concentrically corresponding to a center of said stator and being additionally supported by a support at a position located at one of between said drive section and said pump section, and inside said drive section;
- and
- a cup-shaped rotor coaxially arranged with said stator and externally located relative to said stator and having a rotor bottom located on a side of said partition and connected to said drive shaft;
- whereby said motor is subject to an excitation caused by permanent magnets and to electronic commutation of a stator current;
- and
- a pump section formed within said housing and being separated from said drive section by said partition, and comprising an impeller mounted on said drive shaft.
Dependencies are inferred from the claim text.