摘要:
A fluid transport device defining a centerline axis therethrough includes at least one rotatable member including a first portion and a second portion axially opposite the first portion. The fluid transport device also includes at least one stationary member positioned proximate the at least one rotatable member. The at least one rotatable member and the at least one stationary member define at least one stage. The at least one rotatable member defines at least one pressure balance port extending from the second portion to the first portion. The at least one pressure balance port is configured to substantially equalize a fluid pressure proximate the second portion with a pressure of a fluid proximate the first portion.
摘要:
According to a first aspect, the present invention relates to a propeller pump comprising a pump housing and a pump core that is arranged in the pump housing and has a propeller, which together delimit a channel, and which are connected by means of a guide vane. The propeller pump is characterized in that a cross-sectional area (A2) of the channel (27) at the rear edge (30) of the guide vane (13) has a measure that is greater than, and that is less than a factor of 1,1 times, a cross-sectional area (A1) at the rear edge (29) of the blades (21) of the propeller, and that the specific rotational speed of the propeller pump is greater than 200 and less than 300. According to a second aspect, the present invention relates to a pump station comprising such a propeller pump.
摘要:
According to a first aspect, the present invention relates to a propeller pump comprising a pump housing and a pump core that is arranged in the pump housing and has a propeller, which together delimit a channel, and which are connected by means of a guide vane. The propeller pump is characterized in that a cross-sectional area (A2) of the channel (27) at the rear edge (30) of the guide vane (13) has a measure that is greater than, and that is less than a factor of 1,1 times, a cross-sectional area (A1) at the rear edge (29) of the blades (21) of the propeller, and that the specific rotational speed of the propeller pump is greater than 200 and less than 300. According to a second aspect, the present invention relates to a pump station comprising such a propeller pump.
摘要:
A mechanically reconfigurable marine propulsion device (10) that adapts to engine torque and/or vessel speed thereby providing improved propulsive efficiency and performance. The axial flow propulsion device has two or more stages each having an impeller section and a stator section. Stator vanes (40, 42, 44) and/or the pumping chamber (19) provide a flow diffusion that generates increased hydrostatic pressure from ram pressure recovered from high velocity working fluid which, due to reduced fluid velocity and increased hydrostatic pressure, lowers cavitation events and frictional losses within the propulsion device. Optionally, variable-pitch vanes (80, 82) in the stator section control the amount of ram pressure imparted to the working fluid. Also optionally, variable-pitch inlet guide vanes (46) control the whirl angle and/or mass flow rate of incoming fluid independently of rotor or vessel speed. A set of fixed or variable exit guide vanes aft of the pumping chamber provides flow straightening.
摘要:
L'invention concerne une pompe hydraulique (10) comprenant un arbre de pompe (52) et un carter (46) délimitant un canal de circulation de liquide (44) présentant un orifice de sortie (12) de section aplatie et étant orienté de manière à ce que le liquide s'en échappe selon un axe de sortie de liquide (14) incliné par rapport à un axe longitudinal (22) de l'arbre de pompe traversant le carter, celui-ci comprenant un premier tronçon (100a) dont la surface intérieure (102a) est de section circulaire centrée sur l'axe longitudinal (22) et entourant un impulseur de pompe (60) porté par l'arbre de pompe (52). Selon l'invention, le premier tronçon (100a) présente une extrémité aval à partir de laquelle la section de la surface intérieure du carter s'aplatit.
摘要:
A pressurized water reactor (PWR) comprises: a nuclear core comprising a fissile material; a cylindrical pressure vessel having a vertically oriented cylinder axis and containing the nuclear core immersed in primary coolant water; and a hollow cylindrical central riser disposed concentrically with and inside the cylindrical pressure vessel. A downcomer annulus is defined between the hollow cylindrical central riser and the cylindrical pressure vessel. The hollow cylindrical central riser has a radially expanding upper orifice that merges into an annular divider plate that separates an upper plenum above the annular divider plate from a lower plenum below the annular divider plate. The upper plenum is in fluid communication with the radially expanding upper orifice and the lower plenum is in fluid communication with the downcomer annulus. A weir may extend away from a bottom wall of the lower plenum into the lower plenum. An emergency core cooling system (ECCS) return line nozzle may be arranged to inject water into the upper plenum. A pump support plate spans the inner diameter of the cylindrical pressure vessel and forms a portion of the pressure boundary of the cylindrical pressure vessel, and reactor coolant pumps (RCPs) are supported by the pump support plate. Alternatively, reactor coolant pumps (RCPs) are supported by an arcuate annular ledge formed in the upper portion of the cylindrical pressure vessel.
摘要:
An inducer with an exterior housing and/or interior hub that incorporates grooves or vanes that are helical in nature and in counter rotation with respect to the rotation of the blades of the inducer, which grooves or vanes capture fluid rotating with the inducer blades and use that rotation to guide the fluid up along paths formed by the grooves or vanes and into an impeller, pump or other device.
摘要:
Es wird eine elektrische Fluidpumpe in Halbaxialbauweise vorgeschlagen, bei der ein druckseitiges Motorgehäuseteil (9) einen Nachleitapparat (42) aufweist. Durch diesen Nachleitapparat (42) kann eine beinahe vollständige Drallfreiheit erzielt werden, so dass die kinetische Energie der Tangentialkomponente der Ström ungsgeschwindigkeit mit geringen Reibungsverlusten in Druckenergie umgewandelt wird. Dies erhöht den Wirkungsgrad der Fluidpumpe. Zur Erzielung einer gleichen Fördermenge kann somit die Baugröße auch des Elektromotors reduziert werden.