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- #POINT BY POINT METHOD CENTRIFUGAL IMPELLER DESIGN GENERATOR#
- #POINT BY POINT METHOD CENTRIFUGAL IMPELLER DESIGN FREE#
Open impeller. Open impellers have the vanes free on both sides.The impeller of a centrifugal pump can be of three basic types: A properly designed impeller optimizes flow while minimizing turbulence and maximizing efficiency. Impeller design is the most significant factor for determining the performance of a centrifugal pump. Auxilliary systems. Oil lubrication system, oil lift system, seal leakoff system, seal cooling system etc.Flywheel. The flywheel provides flow coastdown in case of loss of power.
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RCPs usually use a combination of fluid dynamic bearings and hydrostatic bearings in the radial bearing assembly ( water-lubricated close to the primary coolant) and oil lubricated bearings used in the thrust (axial) bearing assembly (in the motor section). Bearings constrain the relative motion of the shaft (rotor) and reduce friction between the rotating shaft and the stator. A shaft seal package is used to prevent any water from leaking up the shaft into the containment. A shaft is a mechanical component for transmitting torque from the motor to the impeller. An impeller is a rotor used to increase the pressure and flow of a coolant. The motor is a large, air or water (seal-less RCPs) cooled induction motor. The main components of a reactor coolant pump The coolant will then pass through the nuclear core and through the fuel, where it collects heat and is sent back to the steam generators. After the coolant leaves the discharge side of the pump, it will enter the cold leg and continue to the reactor. At the discharge of the reactor coolant pump, the reactor coolant pressure will be approximately 0,5MPa higher than the inlet pressure. This increase in velocity is converted to pressure in the discharge volute. The water is increased in velocity by the pump impeller. The reactor coolant enters the suction side of the pump at high pressure and temperature ( ~16MPa 290☌ 554☏).
#POINT BY POINT METHOD CENTRIFUGAL IMPELLER DESIGN GENERATOR#
Most RCPs are vertically installed on a cold leg of a primary loop, but a direct connection to a steam generator is possible. Generally, reactor coolant pumps are powerful, they can consume up to 6 MW each, and therefore they can be used for heating the primary coolant before a reactor startup. Most of PWRs use four RCPs in two or four loops design. This article is focused on RCPs for pressurized water reactors.
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There are significant differences between pumps for different reactor types. There are many designs of these pumps, and there are many designs of primary coolant loops. The purpose of the reactor coolant pump is to provide forced primary coolant flow to remove and transfer the amount of heat generated in the reactor core. Reactor coolant pumps (RCPs) are used to pump primary coolant around the primary circuit. There are at least 5 common types of bearing, each of which operates on different principles: Centrifugal pumps are provided with packing rings or mechanical seal, which helps prevent the leakage of the pumped liquid. The diffuser directs the flow, allows a more gradual expansion, and therefore increases the efficiency of the centrifugal pump. A diffuser is a set of stationary vanes that surround the impeller. Some centrifugal pumps contain diffusers. Therefore, according to Bernoulli’s principle, the volute converts kinetic energy into pressure by reducing speed while increasing pressure. The volute of a centrifugal pump is the casing that receives the fluid being pumped by the impeller, slowing down the fluid’s flow rate. The volute is a curved funnel that increases in area as it approaches the discharge port. The casing contains the liquid and acts as a pressure containment vessel that directs the liquid flow in and out of the centrifugal pump. An impeller is a rotor used to increase the kinetic energy of the flow. These components are designed to perform specific tasks: The mechanical end of the pump includes the pump shaft, sealing, bearings, and shaft sleeve. The mechanical end includes those parts that support the impeller within the casing. In this case, also bearing can belong to wet ends. In some cases, the first radial bearing can be water lubricated.
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The two primary wet ends are the impeller and casing. The wet end of the pump includes those parts that determine the hydraulic performance of the pump. These components can be subdivided into the wet end and the mechanical end. There are a few components that virtually every centrifugal pump has in common. Each centrifugal pump is made of hundreds of parts.