摘要:
A variable displacement pump-motor includes a pump-motor having a plurality of cylinders and pistons, and further including a main shaft rotatable relative to the system body. A hydro mechanical control system includes a plurality of main stage valves in communication with the plurality of cylinders. Each of the main stage valves is configured to open and close a cylinder of the plurality of cylinders to one or more of high or low pressure fluid sources. A pilot spool valve is in selective communication with each of the main stage valves. The pilot spool rotates with the main shaft. The pilot spool includes coding configured to operate each of the main stage valves to open and close the respective cylinders to the one or more high and low pressure fluid sources according to a translational position of the pilot spool and rotation of the pilot spool by the main shaft.
摘要:
A method of controlling a piston pump is disclosed. The method includes actuating a plurality of pistons housed within a cylinder barrel to cause each of the plurality of pistons to engage in reciprocating motion. Fluid supplied to each of the pistons may be regulated by changing a clock position of an intake cam ring to cause a plurality of intake valves to open and close relative to the clock position of the intake cam ring. Fluid discharged by each of the pistons may be regulated by changing a clock position of an exhaust cam ring to cause a plurality of exhaust valves to open and close relative the clock position of the exhaust cam ring.
摘要:
A method of controlling a piston pump is disclosed. The method includes actuating a plurality of pistons housed within a cylinder barrel to cause each of the plurality of pistons to engage in reciprocating motion. Fluid supplied to each of the pistons may be regulated by changing a clock position of an intake cam ring to cause a plurality of intake valves to open and close relative to the clock position of the intake cam ring. Fluid discharged by each of the pistons may be regulated by changing a clock position of an exhaust cam ring to cause a plurality of exhaust valves to open and close relative the clock position of the exhaust cam ring.
摘要:
A distributing valve for a concrete pump and the concrete pump are provided, the distributing valve comprises a valve body (200) and a valve core (300), and a delivering cavity (213) is internally formed in the valve body (200) and is provided with a material inlet, a material outlet (212) and material suction openings (251,252). The material outlet (212) is communicated with a delivery pipe and the material suction opening (251,252) is communicated with a delivery cylinder (500). The valve core (300) is a L-shaped pipe formed by a first pipe section (310) and a second pipe section (320), and one end of the L-shaped pipe is connected with a hopper (600) and a revolution fitting surface is formed between the end face of the other end of the L-shaped pipe and the internal face of the valve body (200).
摘要:
An object of the present invention is to provide a suction-discharge device for fluids capable of sucking fluids continuously and discharging fluids continuously under fixed flow rate and pressure, without substantially bringing about pulsations of even one unit. The device comprising a device body having a fitting hole and set comprising a suction hole and a discharge hole, an inner tube fitted rotatably in the fitting hole of the device body, a piston fitted slidably in said inner tube, and a plurality of through-holes formed in said inner tube, said through-holes of said inner tube each being a slot which is long in a rotational direction and inclined with respect to an axis of the inner tube, the suction hole and the discharge hole of said device body each being a slot which can partially overlap with said through-hole wherein when one of the through-holes of said inner tube communicates with the suction hole of said device body, the other through-hole of the inner tube communicates with a discharge hole of said device body, and when a fluid is sucked from the communicated suction hole said fluid is discharged from the communicated discharge hole.
摘要:
A constant flow concrete pump having a number of hydraulically actuated concrete pump assemblies connected to inlet openings in one wall of a semi-fluid concrete hopper which has a single discharge opening in the opposite wall, and a valve mounted in the hopper and having an inlet of sufficient length to encompass at least two of the inlet openings in the hopper wall, relative movement is provided between the valves and inlet openings to provide constant flow of concrete through the hopper. The valve can be fixed, oscillated or rotated.
摘要:
An object of the present invention is to provide a suction-discharge device for fluids capable of sucking fluids continuously and discharging fluids continuously under fixed flow rate and pressure, without substantially bringing about pulsations even one unit. This invention comprising an inner tube fitted rotatably in a fitting hole of a device body, a cylinder fitted slidably in the inner tube, and a plurality of through-holes formed in the inner tube, wherein when one of the through-holes of said inner tube comes into communication with a suction hole of the device body, the other through-hole of the inner tube comes into communication with a discharge hole of the device body, and when a fluid is sucked from the suction hole communicated, the fluid is discharged from the discharge hole communicated, through-hole of the inner tube being formed into a slot which is long in a rotational direction and inclined, the suction hole and the discharge hole of the device body being formed into a slot to be crossed with the through-hole.
摘要:
It is an object of the present invention to provide a fluid suction and discharge apparatus capable of continuously discharging fluid with a predetermined flow rate and pressure continuously sucking the fluid without substantially giving rise to pulsation. This invention comprises an inner tube rotatably fitted in a fitting hole of the apparatus body, a cylinder slidably fitted into the inner tube, and a plurality of through-holes formed in the inner tube, wherein when the cylinder is reciprocated in association with rotation of the inner tube, and when one of the through-holes of the inner tube is communicated with a suction hole of the apparatus body, the other through-hole of the inner tube is communicated with a discharge hole of the apparatus body, and when fluid is sucked from a communication suction hole thus communicated, fluid is discharged from the discharge hole thus communicated.
摘要:
Method and apparatus overcoming gas-lock in reciprocating downhole pumps. On the downstroke of a plunger in a barrel, gassy fluid is compressed in the pump chamber between standing and travelling valves. Downhole plunger movement drags a sleeve over a mandrel for opening a chamber valve to a staging chamber located at a downhole end of the travelling valve for receiving at least a portion of the compressed and gassy fluid therein. On the upstroke, the chamber valve is dragged closed for sealably retaining the compressed gassy fluid therein while drawing an additional increment of fluid through the standing valve into the pump chamber. Continued downstroke and upstroke cycles increases pressure of the compressed gassy fluid in the pump chamber until it exceeds the hydrostatic head above the travelling valve for resumption of normal fluid pumping.