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US 12,215,689 B2Granted
Eccentric screw pump with a pressure chamber between an elastomeric stator portion and a casing
AssigneeGrundfos Holding A/S
InventorNiels Erik Linnemann Nielsen
Life of this patent
Estimating the term…
Abstract
An eccentric screw pump with a rotor (2) and with a rotationally fixed stator (6; 6′) surrounding the rotor (2). The rotationally fixed stator includes at least one elastomeric portion, wherein a pressure chamber (16) is arranged on this elastomeric portion of the stator (6; 6′) at a side facing away from the rotor (2). The pressure chamber (16) is connected to a pressure region of the eccentric screw pump such that the at least one elastomeric portion of the stator (6; 6′) is subjected to a pressure produced by the eccentric screw pump.
Claims20
An eccentric screw pump comprising:
- a rotor;
- and
- a stator surrounding the rotor, the stator comprising at least one elastomeric stator portion in contact with the rotor and a pressure chamber formed on a radial outer side of said elastomeric stator portion, the radial outer side facing away from said rotor, wherein said pressure chamber is connected to a pressure region of the eccentric screw pump such that the at least one elastomeric stator portion is subjected to a pressure produced by the eccentric screw pump, the pressure chamber being connected to a pressure region of a delivery end of the pump via at least one pressure channel, the at least one pressure channel being arranged inside a casing of the stator, wherein the pressure in the pressure chamber is greater than the pressure on a radial inner side of the at least one elastomeric stator portion, the at least one elastomeric stator portion comprising elastomeric material, the pressure channel being formed inside the elastomeric material of the elastomeric stator portion, wherein the pressure channel has a cross section that is less than a cross section of the pressure chamber.
An eccentric screw pump comprising:
- a rotor;
- and
- a stator surrounding the rotor, the stator comprising at least one elastomeric stator portion and a pressure chamber formed on a radial outer side of said elastomeric stator portion, the radial outer side facing away from said rotor, wherein said pressure chamber is connected to a pressure region of the eccentric screw pump such that the at least one elastomeric stator portion is subjected to a pressure produced by the eccentric screw pump, wherein the elastomeric stator portion of the stator has a varying thickness over an axial extension thereof, wherein a flexibility of the elastomeric stator portion at a delivery end of the eccentric screw pump is greater than a flexibility of the elastomeric stator portion at a suction end of the eccentric screw pump, the pressure in the pressure chamber being greater than the pressure on a radial inner side of the at least one elastomeric stator portion, the at least one elastomeric stator portion comprising elastomeric material, the pressure channel being formed in the elastomeric material of the elastomeric stator portion, wherein the pressure channel has a cross section that is less than a cross section of the pressure chamber.
An eccentric screw pump comprising:
- a rotor;
- and
- a stator surrounding the rotor, the stator comprising at least one elastomeric stator portion in contact with the rotor and a pressure chamber formed on a radial outer side of said elastomeric stator portion, the radial outer side facing away from said rotor, wherein said pressure chamber is connected to a pressure region of the eccentric screw pump such that the at least one elastomeric stator portion is subjected to a pressure produced by the eccentric screw pump, wherein the pressure in the pressure chamber is greater than the pressure on a radial inner side of the at least one elastomeric stator portion, the pressure chamber being connected to the pressure region in the flow path for the fluid pumped by the pump, the pressure chamber being connected to the pressure region via at least one pressure channel, the stator being arranged in a casing and the pressure chamber being formed between the casing and the at least one elastomeric stator portion, the at least one elastomeric stator portion comprising elastomeric material, the elastomeric material of the elastomeric stator portion defining the pressure channel, wherein the pressure channel has a pressure channel cross section, the pressure chamber having a pressure chamber cross section, wherein the pressure channel cross section is less than the pressure chamber cross section.
Dependencies are inferred from the claim text.