4results about How to "Small flow pulsation" patented technology

The invention discloses a high-stability controllable hydraulic rotary actuator low-speed stability performance testing device and method. The testing device comprises a mechanical system, a hydraulic system and an electrical system. Wherein the mechanical system comprises a rack, a winch, a twisted rope and the like, the hydraulic system comprises a hydraulic cylinder, a tested element, a fixed-displacement radial plunger pump and the like, and the electrical system comprises a load feedback system and a flow feedback system. According to the testing device, a highly controllable hydraulic winch based on a hydraulic cylinder is designed, and stable loading torque is provided; a proportional servo hydraulic system is established, and the stability of load torque and input flow can be greatly improved through the design of a two-stage flow controller. The stable loading torque and the stable input flow can ensure the stable and accurate measurement of the large-torque ultra-low-speed hydraulic rotary actuator.

The invention provides a flow-expandable hose diaphragm pump system and a control method. Comprising a feeding one-way valve (101), a discharging one-way valve (102), a diaphragm chamber (103), a propulsive liquid actuator (104), a closed variable pump (1), a cooling flush valve (2), an overflow valve (3), a first one-way valve (4), a second one-way valve (5), a double-acting actuator (6) and a variable rotating speed motor (7). The closed variable pump (1) is connected with the double-acting actuator (6); and the double-acting actuator (6) is connected with the diaphragm chamber (103) through the propulsive liquid actuator (104). The conveying loop of each diaphragm chamber (103) is an independent unit and is realized by increasing or reducing the number of the conveying loops of the diaphragm chambers and the single displacement, and the adaptability of the control system is high. Left-right staggered reciprocating control over movement of the double-acting actuator is achieved, the stacking speed of the double cylinders is always stable, flow pulsation in the conveying process is small, and the energy-saving efficiency is high.

The utility model relates to a kind of helical gear pump with multiple-tooth number asymmetric same modulus involute tooth profile, belong to helical gear pump technical field. Including back cover, positioning pin, floating sleeve, driving helical gear, driven helical gear, high-pressure sealing assembly, sealing ring, front cover, rotating lip skeleton oil seal, hole with clasp spring, bolt and pump body;Driving helical gear and driven helical gear are multiple-tooth number asymmetric same modulus involute tooth profile helical gear.The driving helical gear and driven helical gear in the utility model adopt multiple-tooth number asymmetric same modulus involute tooth profile, while increasing tooth thickness, leave out rotation space for addendum, ensure the strength and the stability of operation of gear, under the same addendum circle diameter, compared with standard helical gear, increase 4-6 tooth number, reduce flow pulsation, reduce noise.

The present invention discloses a control method for suppressing flow pulsation of an axial piston pump, the method comprising: obtaining an initial rotor phase angle and an initial swash plate inclination angle of the axial piston pump; using the initial rotor phase angle as the current rotor phase angle; using the initial swash plate inclination angle as the current swash plate inclination angle; determining the current flow of the axial piston pump according to the current rotor phase angle and the current swash plate inclination angle; when the absolute value of the difference between the current flow and the flow threshold is greater than the difference threshold, determining the target rotation speed of the swash plate in the axial piston pump according to the current rotor phase angle and the current swash plate inclination angle; the rotation speed of the swash plate is used to control the rate of change of the swash plate inclination angle; the swash plate inclination angle is used to control the flow of the axial piston pump. The present invention reduces the flow pulsation by adjusting the swash plate inclination angle, thereby reducing damage to the axial piston pump.