Abstract

A motor-driven centrifugal pump for circulating a coolant in a primary circuit of a nuclear reactor comprises a sealed motor unit, a hydraulic part and a shaft which is immersed in the coolant, turned by the sealed motor unit and pumping the coolant by means of an impeller of the hydraulic part secured to the shaft; the motor unit comprising a dry stator and an immersed rotor mounted securely on the shaft. The motor-driven pump also comprises an immersed flywheel mounted securely on the shaft between the rotor of the motor unit and the impeller of the hydraulic part, allowing a minimum slowing-down time after the electrical power supply is cut; the flywheel comprising a vaned wheel generating a circulation of the coolant to cool the motor unit.

IPC Classes  ?

• F04D 7/08 - Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being radioactive
• F04D 13/06 - Units comprising pumps and their driving means the pump being electrically driven
• F04D 13/14 - Combinations of two or more pumps the pumps being all of centrifugal type
• F04D 15/00 - Control, e.g. regulation, of pumps, pumping installations, or systems
• F04D 29/04 - Shafts or bearings, or assemblies thereof
• F04D 29/06 - Lubrication
• F04D 29/00 - NON-POSITIVE-DISPLACEMENT PUMPS - Details, component parts, or accessories
• F04D 29/58 - Cooling; Heating; Diminishing heat transfer
• F04D 29/047 - Bearings hydrodynamic
• G21C 15/243 - Promoting flow of the coolant for liquids
• H02K 5/12 - Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
• H02K 7/02 - Additional mass for increasing inertia, e.g. flywheels
• F04D 1/00 - Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
• F04D 13/02 - Units comprising pumps and their driving means
• F04D 29/049 - Roller bearings
• F04D 29/22 - Rotors specially for centrifugal pumps
• F04D 29/42 - Casings; Connections for working fluid for radial or helico-centrifugal pumps
• G21C 1/32 - Integral reactors, i.e. reactors wherein parts functionally associated with the reactor but not essential to the reaction, e.g. heat exchangers, are disposed inside the enclosure with the core

Abstract

A motor-driven centrifugal pump for circulating a coolant in a primary circuit of a nuclear reactor comprises a sealed motor unit, a hydraulic part and a shaft which is immersed in the coolant, turned by the sealed motor unit and pumping the coolant by an impeller of the hydraulic part secured to the shaft. The motor unit comprises a dry stator and an immersed rotor, mounted securely on the shaft. The motor-driven pump also comprises an immersed flywheel mounted securely on the shaft between the rotor of the motor unit and the impeller of the hydraulic part, allowing a minimum slowing-down time after the electrical power supply is cut; and an immersed anti-backspin device, configured to mechanically block the rotation of the shaft in a predetermined direction.

IPC Classes  ?

• F04D 13/00 - Pumping installations or systems
• G21C 15/243 - Promoting flow of the coolant for liquids
• F16D 41/18 - Freewheels or freewheel clutches with non-hinged detent
• F16D 43/04 - Internally controlled automatic clutches actuated entirely mechanically controlled by angular speed
• F04D 13/06 - Units comprising pumps and their driving means the pump being electrically driven
• F04D 7/08 - Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being radioactive
• F04D 15/00 - Control, e.g. regulation, of pumps, pumping installations, or systems
• F04D 29/58 - Cooling; Heating; Diminishing heat transfer
• H02K 7/02 - Additional mass for increasing inertia, e.g. flywheels
• H02K 5/173 - Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
• H02K 5/20 - Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
• H02K 7/08 - Structural association with bearings
• H02K 7/10 - Structural association with clutches, brakes, gears, pulleys or mechanical starters
• H02K 7/14 - Structural association with mechanical loads, e.g. with hand-held machine tools or fans
• H02K 9/19 - Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
• F04D 25/06 - Units comprising pumps and their driving means the pump being electrically driven
• H02K 5/12 - Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas

Abstract

The invention relates to a motor-driven centrifugal pump for circulation of heat transfer fluid in the primary circuit of a nuclear reactor. The motor-driven pump comprises a hermetic motor unit (12), a hydraulic section (13) and a shaft (17) immersed in the heat transfer fluid, rotated by the hermetic motor unit (12), and pumping the heat transfer fluid by means of an impeller (22) of the hydraulic section (13) that is rigidly connected to the shaft (17); the motor unit (12) comprising a dry stator (18) and an immersed rotor (19) rigidly connected to the shaft (17). The motor-driven pump also comprises an immersed flywheel (23) rigidly mounted on the shaft (17) between the rotor (19) of the motor unit (12) and the impeller (22) of the hydraulic section (13), enabling a minimum slowing-down time after cutting of the electrical power supply; the flywheel (23) comprising a vane wheel (40) generating circulation of the heat transfer fluid for cooling the motor unit (12).

IPC Classes  ?

• F04D 7/08 - Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being radioactive
• F04D 15/00 - Control, e.g. regulation, of pumps, pumping installations, or systems
• F04D 29/58 - Cooling; Heating; Diminishing heat transfer
• G21C 15/243 - Promoting flow of the coolant for liquids
• H02K 5/12 - Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
• H02K 7/02 - Additional mass for increasing inertia, e.g. flywheels
• H02K 7/118 - Structural association with clutches, brakes, gears, pulleys or mechanical starters with starting devices

Abstract

The invention relates to a motor-driven centrifugal pump for circulation of heat transfer fluid in the primary circuit of a nuclear reactor. The motor-driven pump comprises a hermetic motor unit (12), a hydraulic section (13) and a shaft (17) immersed in the heat transfer fluid, rotated by the hermetic motor unit (12) and pumping the heat transfer fluid by means of an impeller (22) of the hydraulic section (13) rigidly connected to the shaft (17). The motor unit (12) comprises a dry stator (18) and an immersed rotor (19), rigidly connected to the shaft (17). The motor-driven pump also comprises an immersed flywheel (23) rigidly connected to the shaft (17) between the rotor (19) of the motor unit (12) and the impeller (22) of the hydraulic section (13), enabling a minimum slowing down time after cutting of the electrical power supply; and an immersed device for preventing rotation in the wrong direction, configured so as to mechanically block rotation of the shaft (17) in a predetermined direction.

IPC Classes  ?

• F04D 7/08 - Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being radioactive
• F04D 15/00 - Control, e.g. regulation, of pumps, pumping installations, or systems
• F04D 29/58 - Cooling; Heating; Diminishing heat transfer
• G21C 15/243 - Promoting flow of the coolant for liquids
• H02K 5/12 - Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
• H02K 7/02 - Additional mass for increasing inertia, e.g. flywheels
• H02K 7/118 - Structural association with clutches, brakes, gears, pulleys or mechanical starters with starting devices

Abstract

The invention relates to a motor-driven centrifugal pump for circulation of heat transfer fluid in the primary circuit of a nuclear reactor. The motor-driven pump comprises a hermetic motor unit (12), a hydraulic section (13) and a shaft (17) immersed in the heat transfer fluid, rotated by the hermetic motor unit (12), and pumping the heat transfer fluid by means of an impeller (22) of the hydraulic section (13) that is rigidly connected to the shaft (17); the motor unit (12) comprising a dry stator (18) and an immersed rotor (19) rigidly connected to the shaft (17). The motor-driven pump also comprises an immersed flywheel (23) rigidly mounted on the shaft (17) between the rotor (19) of the motor unit (12) and the impeller (22) of the hydraulic section (13), enabling a minimum slowing-down time after cutting of the electrical power supply; the flywheel (23) comprising a vane wheel (40) generating circulation of the heat transfer fluid for cooling the motor unit (12).

IPC Classes  ?

• F04D 7/08 - Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being radioactive
• F04D 15/00 - Control, e.g. regulation, of pumps, pumping installations, or systems
• F04D 29/58 - Cooling; Heating; Diminishing heat transfer
• G21C 15/243 - Promoting flow of the coolant for liquids
• H02K 5/12 - Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
• H02K 7/02 - Additional mass for increasing inertia, e.g. flywheels
• H02K 7/118 - Structural association with clutches, brakes, gears, pulleys or mechanical starters with starting devices

Abstract

The invention relates to a motor-driven centrifugal pump for circulation of heat transfer fluid in the primary circuit of a nuclear reactor. The motor-driven pump comprises a hermetic motor unit (12), a hydraulic section (13) and a shaft (17) immersed in the heat transfer fluid, rotated by the hermetic motor unit (12) and pumping the heat transfer fluid by means of an impeller (22) of the hydraulic section (13) rigidly connected to the shaft (17). The motor unit (12) comprises a dry stator (18) and an immersed rotor (19), rigidly connected to the shaft (17). The motor-driven pump also comprises an immersed flywheel (23) rigidly connected to the shaft (17) between the rotor (19) of the motor unit (12) and the impeller (22) of the hydraulic section (13), enabling a minimum slowing down time after cutting of the electrical power supply; and an immersed device for preventing rotation in the wrong direction, configured so as to mechanically block rotation of the shaft (17) in a predetermined direction.

IPC Classes  ?

• F04D 7/08 - Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being radioactive
• F04D 15/00 - Control, e.g. regulation, of pumps, pumping installations, or systems
• F04D 29/58 - Cooling; Heating; Diminishing heat transfer
• G21C 15/243 - Promoting flow of the coolant for liquids
• H02K 5/12 - Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
• H02K 7/02 - Additional mass for increasing inertia, e.g. flywheels
• H02K 7/118 - Structural association with clutches, brakes, gears, pulleys or mechanical starters with starting devices

Goods & Services

Machines et machines-outils; moteurs (excepté pour véhicules); accouplements et courroies de transmission (excepté pour véhicules); grands instruments pour l'agriculture; couveuses et, notamment, des pompes. Appareils et instruments scientifiques, nautiques, géodésiques, électriques (y compris la T.S.F.), photographiques, cinématographiques, optiques, de pesage, de mesurage, de signalisation, de contrôle (inspection), de secours (sauvetage) et d'enseignement; appareils automatiques déclenchés par l'introduction d'une pièce de monnaie ou d'un jeton; machines parlantes; caisses enregistreuses, machines à calculer; appareils extincteurs et, notamment, des pompes.