摘要:
This wheel comprises a plurality of vanes (2) arranged on a crown (3) and is equipped with a tip-forming member (10) attached to a central region (32) of the crown or hub of the wheel (1), radially inside the vanes (2), the crown defining a wet surface (31) for guiding a flow (E) passing between the vanes. The tip-forming member (10) is provided with at least one opening (121) for diverting a fraction (E1) of the flow towards the internal volume (V10) of this member. This member comprises a frustoconical annular skirt (11) and at least one fin (15) arranged in its internal volume (V10) and able to modify the path of the flow fraction (E1) entering this volume through the opening (121). This fin (15) extends as far as the edge (112) of the skirt (11) which defines an outlet opening (14) of the member (10) for the flow fraction (E1).
摘要:
A hydraulic engine which may generate rotational power by using environmentally friendly electric energy and have improved performance and a long life span, and more particularly, environmentally friendly hydraulic power units that that may extrude a working fluid to realize an engine and has a long life span. The hydraulic engine includes: a housing; a rotor that is rotatably supported in the housing and allows rotor blades to be disposed therearound; a plurality of hydraulic power units that are disposed around the rotor to be spaced apart from one another; and an output shaft that rotates as the rotor rotates and the output shaft protrudes beyond the housing, wherein a fluid extruded from hydraulic power units pressurizes the rotor blades and generates a rotational force of the output shaft.
摘要:
A method of controlling wicket gates of a pump-turbine which prevents abnormal hydraulic pressure variation when load carried on the pump-turbine is removed during the turbine operation thereof. The wicket gates are controlled to open when it is detected that discharge per unit head reduces with the reduction of speed per unit head. When it is once detected that the ratio of variation in the discharge per unit head to the variation in the speed per unit head is reversed from a positive value to a negative value, the wicket gates are closed.
摘要:
A high pressure centrifugal pump has an impeller assembly including two mating impeller sections which are each constituted by a shroud with fixed geometry blades. The impeller sections are fixedly mounted upon a rotatable shaft and are of a construction which permits the pressure between the impeller sections to engender flexure of the sections away from each other so as to vary the breadth of the impeller assembly. A servo control device is adapted to control the pressure behind the shrouds such that the pump delivers a constant flow at varying back pressures.
摘要:
In a control system for a hydroelectric power station system including upper and lower water reservoirs connected through a water channel, an intermediate water reservoir having a smaller storage capacity than those of the upper and lower reservoirs and provided on the water channel in cascade with the upper and lower reservoirs, and two power stations disposed between the upper and intermediate reservoirs and between the intermediate and lower reservoirs, respectively, the control system is arranged such that the water level of the intermediate reservoir is detected continuously and the detected value of the water level is used to correct the load instructions which are applied to the power stations for controlling outputs of the power stations whereby the water level of the intermediate reservoir is maintained substantially constant, while the power generation of the power stations is controlled so as to satisfactorily meet with the load instruction applied to the power system.
摘要:
Choke valves are provided in association with submergible pumps employed in oil wells or the like to prevent the flow of well fluid toward the well head when the pump is not operating. Differential pressure across the pump is employed to open the valve, and the valve closes automatically when the pump is deenergized. Bottom-hole pressure merely closes the valve more tightly. The pump may be located above or below the valve, and several different choke configurations with different modes of valve operation are disclosed. The storm chokes can be opened by fluid pressure applied from the earth''s surface in order to permit ''''killing the well'''' or flushing sand from the choke.
摘要:
A control system for opening and closing a butterfly valve rotatably mounted in a fluid channel is provided. The piston of a servo-motor is operatively connected to the butterfly valve through a weight member and will close the butterfly valve at either a rapid or a slow speed in accordance with the rate of flow of the fluid detected within the channel. The rapid or slow rate of closure is obtained by coupling a main pipe line and a manifold pipe line to a fluid contained tank and to the cylinder of the servo-motor. The main pipe line and the manifold pipe line are separately operative in accordance with valves attached thereto and the rate of closure control is provided by having the cross-sectional area of the main pipe line larger than that of the manifold pipe line so that a different rate of exhaustion of the fluid within the servo-motor will occur depending which line is utilized.
摘要:
A hydraulically driven radial inflow turbine having power takeoff means attached thereto is actuated and controlled by an axially translatable nozzle ring. A manually actuatable trigger mechanism admits a small amount of control fluid which is tapped from a primary source of liquid under pressure into a chamber defined by the nozzle ring and the turbine housing to move the nozzle ring in registering alignment with the primary liquid inlet apertures to the turbine impeller blades. The trigger assembly proportionately supplies hydraulic pressure to the turbine to control the flow of fluid to the turbine thereby controlling the power output.