Pump device

Abstract

A pump device for delivering fluid to be pumped includes at least one drive unit with a drive and at least one receiving region on which at least two pump cartridges can be positioned so as to be hydraulically connected in series.

1 .- 83 . (canceled) 
     
     
         84 . A pump device for delivering a fluid to be pumped, comprising:
 at least one drive,   a pump element for generating a pressure differential,   a connecting section and an electrical supply means, wherein the pump element is arranged between the drive and the connecting section, and   a drive shaft, which is connected to the drive in a torque-proof manner,   wherein the drive shaft either is or comprises a hollow shaft and the electrical supply means runs inside the drive shaft.   
     
     
         85 . The pump device according to  claim 84 , wherein a central anchor is arranged inside the hollow shaft and coaxially to the hollow shaft,
 the electrical supply means runs in a clearance between the central anchor and the hollow shaft, and   an electrical conductor of the electrical supply means is arranged uniformly around the anchor in a circumferential direction, wherein the electrical supply means includes at least two electrical conductors.   
     
     
         86 . The pump device according to  claim 84 , wherein an inner insulating layer is arranged between electrical conductors of the electrical supply means and a central anchor, and
 an outer insulating layer is arranged between the electrical conductors of the electrical supply means and the hollow shaft, wherein said outer insulating layer does not contact the hollow shaft.   
     
     
         87 . The pump device according to  claim 84 , wherein the electrical supply means runs inside a tube, which runs inside the hollow shaft. 
     
     
         88 . A pump device for delivering a fluid to be pumped, comprising:
 at least one first pump element for generating a pressure differential,   at least one second pump element for generating a pressure differential, wherein the first pump element and the second pump element are arranged in relation to one another and configured such that an axial thrust, which acts on the first pump element when the pressure differential is generated, is opposed to an axial thrust, which acts on the second pump element when the pressure differential is generated,   wherein the second pump element is configured and arranged substantially mirror-symmetrically to the first pump element.   
     
     
         89 . The pump device according to  claim 88 , wherein the first pump element has a first impeller with a suction nozzle, the second pump element has a second impeller with a suction nozzle, and the suction nozzle of the first impeller and the suction nozzle of the second impeller face one another. 
     
     
         90 . The pump device according to  claim 88 , wherein the first pump element is arranged in a first pressure generation region, which has an axial suction opening,
 the second pump element is arranged in a second pressure generation region, which has an axial suction opening,   the axial suction opening of the first pressure generation region and the axial suction opening of the second pressure generation region are directed in opposing directions,   the first pressure generation region and the second pressure generation region are arranged adjacent to one another,   the axial suction opening of the first pressure generation region and the axial suction opening of the second pressure generation region are arranged at sides of the first pressure generation region and of the second pressure generation region facing away from one another,   the first pressure generation region is delimited in a radial direction outwards by a first radial partition wall, which has at least one suction opening of the first pressure generation region,   the at least one suction opening is configured to establish a fluidically-effective connection from the first pressure generation region to a fluid passage, which connects the at least one suction opening of the first pressure generation region to the axial suction opening of the second pressure generation region in a fluidically-effective manner.   
     
     
         91 . The pump device according to  claim 90 , wherein at least one first fluid channel extends from the at least one suction opening of the first pressure generation region to a return region,
 an extension of the first fluid channel is delimited in a circumferential direction and is delimited in the radial direction outwards by a cylindrical outer wall of the pump device and inwards by the first radial partition wall and a second radial partition wall,   the second pressure generation region is delimited in the radial direction outwards by the second radial partition wall, which has at least one output opening of the second pressure generation region,   at least one second fluid channel extends from the at least one output opening of the second pressure generation region to a return and outlet region, and   the at least one second fluid channel is delimited in the circumferential direction and arranged offset in the circumferential direction to the at least one first fluid channel.   
     
     
         92 . A pump cartridge for a pump device according to  claim 88 , wherein the first pump element and the second pump element are arranged in relation to one another and designed such that the axial thrust, which acts on the first pump element when the pressure differential is generated, is opposed to the axial thrust, which acts on the second pump element when the pressure differential is generated. 
     
     
         93 . A pump device for delivering a fluid, comprising:
 a drive,   a drive shaft, and   at least two pump elements, which are each configured as an impeller or comprise an impeller,   the drive shaft is or has a hollow shaft, the at least two pump elements are connected to the drive shaft in a torque-proof manner in a first region of the drive shaft, and the drive shaft is mounted in a second region of the drive shaft, which is different from the first region,   the hollow shaft extends from a drive section of the pump device to a connecting section of the pump device,   the hollow shaft is mounted in the connecting section of the pump device, and   the hollow shaft is mounted in the drive section of the pump device.   
     
     
         94 . The pump device according to  claim 93 , wherein the pump device has a first mounting device, which mounts the hollow shaft and has a fixing and mounting device, which mounts the hollow shaft,
 the first mounting device has at least one radial ring bearing by which the hollow shaft is mounted, and   the at least one radial ring bearing is arranged inside an electric motor of the drive.   
     
     
         95 . The pump device according to  claim 94 , wherein the fixing and mounting device has at least one radial ring bearing by which the hollow shaft is mounted, and the at least one radial ring bearing of the fixing and mounting device is located inside of a support section of the fixing and mounting device, which is arranged in the connecting section of the pump device. 
     
     
         96 . A pump device for delivering a fluid to be pumped, comprising:
 a drive unit with a drive and with a drive shaft, wherein the drive shaft is or comprises a hollow shaft and an anchor for absorbing axial forces which run through the hollow shaft.   
     
     
         97 . The pump device according to  claim 96 , wherein the anchor is configured to absorb pump forces, which occur at the pump device when pressure is generated, and the anchor is arranged coaxially to a rotational axis of a pump element for generating a pressure differential. 
     
     
         98 . A pump device for delivering a fluid to be pumped, comprising:
 an outer wall,   at least one drive having an electric motor with windings, wherein the electric motor is arranged in a region filled with a coolant, which comprises a coolant circuit,   the coolant circuit has at least one branch, which extends at least in sections along the outer wall of the pump device, and a coolant circulation in the coolant circuit is driven during operation of the electric motor,   a drive shaft comprising a hollow shaft for torque transmission between the drive and at least one pump element to generate a pressure differential,   the at least one branch extending at least in sections inside the hollow shaft, and   the hollow shaft having at least one bore, which provides a fluidically-effective connection from an interior of the hollow shaft to an exterior of the hollow shaft, and   the at least one bore in the hollow shaft being arranged inside the electric motor,   the electric motor has a rotor with a connection section by which the rotor is held on the hollow shaft, and the connection section has at least one bore,   the at least one bore of the hollow shaft is aligned with the at least one bore in the connection section,   at least one radial ring bearing by which the hollow shaft is mounted against a tube arranged in the hollow shaft,   the tube has at least one bore, which provides a connection from an interior of the tube to an exterior of the tube, and   the at least one bore of the tube is arranged behind the at least one radial ring bearing, as viewed from the at least one drive.   
     
     
         99 . The pump device according to  claim 98 , wherein the at least one radial ring bearing is arranged inside the region filled with coolant and the coolant circuit has at least one branch, which extends at least in sections along the at least one radial ring bearing. 
     
     
         100 . The pump device according to  claim 98 , wherein the pump device is configured as a borehole pump or comprises a borehole pump. 
     
     
         101 . A pump device for delivering a fluid, comprising:
 an outer wall,   at least one drive, which has an electric motor with windings,   at least one pump element for generating a pressure differential,   a drive shaft having a hollow shaft for torque transmission between the at least one drive and the at least one pump element,   the electric motor is arranged in a region filled with a coolant, which comprises a coolant circuit, wherein a coolant circulation is driven during operation of the electric motor,   at least one first radial ring bearing on which the drive shaft is mounted and which is arranged inside the region filled with coolant,   at least one second radial ring bearing on which the hollow shaft of the drive shaft is mounted against a tube arranged in the hollow shaft,   the tube has at least one bore, which provides a connection from an interior of the tube to an exterior of the tube,   the second radial ring bearing, as viewed from the at least one drive, is arranged behind the pump element, and   the tube has at least one bore, which, as viewed from the at least one drive, is arranged at least one of (i) behind the second radial ring bearing, and (ii) inside of the second radial ring bearing, and   wherein the coolant circuit has a branch, which extends at least in sections inside the tube.   
     
     
         102 . The pump device according to  claim 101 , wherein the hollow shaft has at least one bore, which provides a fluidically-effective connection from an interior of the hollow shaft to an exterior of the hollow shaft, and the at least one bore in the hollow shaft is arranged inside the first radial ring bearing, which is arranged inside the drive. 
     
     
         103 . The pump device according to  claim 101 , wherein the coolant circuit has at least one branch, which extends at least in sections along the outer wall of the pump device,
 the electric motor has a rotor with a connection section by which the rotor is held on the hollow shaft, and   the connection section has at least one bore that is aligned with the bore in the connection section.   
     
     
         104 . The pump device according to  claim 101 , wherein the coolant circuit has at least one branch, which extends at least in sections along the windings of the electric motor. 
     
     
         105 . A construction kit for a pump device for delivering fluid to be pumped, the construction kit comprising:
 at least one drive unit with a drive and at least one receiving region;   at least two pump cartridges positioned on the at least one receiving region and hydraulically connected to each other in series, each pump cartridge comprising a housing including a first connecting side, which has a suction opening, and a second connecting side, which has an outlet opening,   wherein at least two of the pump cartridges have different pump capacities.   
     
     
         106 . The construction kit according to  claim 105 , wherein at least one of the pump cartridges comprises at least one pump element arranged in the housing to generate a pressure differential between the suction opening and the outlet opening,
 the at least one pump element comprises an impeller, and   at least two of the pump cartridges have different pump capacities by virtue of a distance between a first wall of the impeller and a second wall of the impeller being different sizes between which the fluid to be pumped is set into rotation.   
     
     
         107 . The construction kit according to  claim 105 , wherein the drive unit has a drive shaft that extends through the receiving region,
 at least one of the pump cartridges has an inner sleeve, which is slidable over the drive shaft of the drive unit,   the inner sleeve is held on the drive shaft in a torque-proof manner by a positive-locking connection,   the inner sleeve extends over an entire height of the respective pump cartridge, and   at least one of the pump cartridges has a pump element, which is held on the inner sleeve of the pump cartridge in a torque-proof manner and fixedly in an axial direction.   
     
     
         108 . A construction kit according to  claim 105 , wherein the construction kit has at least two drive units, which have different drive capacities, and the at least two drive units include different motors having different stator heights and rotor heights. 
     
     
         109 . A method for manufacturing the pump device of the construction kit of  claim 105 , comprising:
 determining a required pump capacity of the pump device;   selecting the pump cartridges required to achieve the pump capacity from said at least two of the pump cartridges; and   selecting a drive unit having a drive capacity required to drive the pump cartridges.   
     
     
         110 . The method according to  claim 109 , further comprising:
 positioning the pump cartridges at a receiving region of the drive unit after the pump cartridges and the drive unit have been selected such that no additional elements have to be inserted into the drive unit when positioning the pump cartridges or the empty cartridges,   placing a connecting section on the drive unit after the pump cartridges have been positioned at the receiving region of the drive unit such that the connecting section encloses the pump cartridges in the drive unit,   fixing the connecting section on the drive unit by at least one fastening element, and   fastening a retaining nut on a securing section of a central anchor after the connecting section has been placed on the drive unit.