451results about How to "Reduce cavitation" patented technology

Apparatuses and methods for electrohydraulic generation of Shockwaves at a rate of between 10 Hz and 5 MHz, and / or that permit a user to view a region of a patient comprising target cells during application of generated Shockwaves to the region. Methods of applying electro-hydraulically generated Shockwaves to target tissues (e.g., for reducing the appearance of tattoos, treatment or reduction of certain conditions and / or maladies).

A Francis turbine with an improved shape of blades, which can reduce cavitations generated on the surface of the blades or reduce the secondary flow around the blades, is provided. A Francis turbine comprises a rotating shaft, a crown, a plurality of blades, and a band. The crown can rotate with the rotating shaft. The blades are circumferentially arranged on the crown, each of which including an inner end as a trailing edge. The band is coaxially coupled with the crown by the blades. The rotating shaft, the crown, the blades, and the band as a whole rotate toward a turbine direction during a turbine operation. A projected profile of the trailing edge on a perpendicular plane, which is perpendicular to a center axis of the rotating shaft, is curved toward a direction opposite to the turbine direction at least in the crown side.

A control valve that reduces noise and controls flow includes a slotted cylindrical skirt and / or a tapered metal ring. The metal ring has a tapered external surface for engaging a matching tapered bore within a valve housing. One embodiment is directed to a control valve including a housing defining a central orifice in fluid in communication with an inlet port and an outlet port, and a movable valve plug assembly having a skirt portion slidably engaged within the central orifice to control fluid flowing through the housing. The skirt portion defines a plurality of openings, which can be slots, to gradually control the flow of fluid through the housing while reducing cavitation. A method of controlling fluid flow in a process includes receiving fluids via an inlet port of a control valve, and controlling the flow of the fluid via a movable skirted valve plug with a plurality of tapered slots.

The invention discloses a kind of pure water off-loading overflow valve consisting of a king pressure control valve and pure water electromagnet switching ball valve. The king pressure control valve consists of a king valve and a guide valve. The king valve plug having a secondary throttling cone valve structure with high pressure conduction is effective to restrain air muddy. The guide valve having cone valve structure with damping piston can increase motion damp and advance working stability of the overflow valve; constant pressure precision of the overflow valve is increased, if set constant liquid damp at the entrance of the guide valve. The electromagnet switching ball valve is generated by dry-type DC electromagnet, and is switched fast by mechanism of force amplification. The invention achieves zero leakage by sealing directly valve plug and valve cover, valve cover and valve body, improve static performance of the overflow valve by add valve port damper and achieve fast over-loading by electromagnets with larger thrust. The invention has characters of good versatility, integrated multifunction and being easy to standardize so as to fit to work under conditions of middle and high pressure water medium.

The invention belongs to the field of circulating cooling water conveying systems and particularly relates to a method for optimizing a circulating cooling water convey system. The method comprises acquisition of date in all procedures of the circulating cooling water system, date analysis, and system optimization. The model number of a water pump actually needed in the system is determined through data acquisition and analysis, and valve loss, local circumfluence, high-low pressure blending, pipeline blockage and unnecessary loss in the system are correspondingly eliminated. By adopting the method, unfavorable working conditions caused by overlarge resistance of the circulating cooling water system, such as overlarge electric motor power, over temperature, cavitation erosion on a water pump, low operation efficiency and the like are improved, and most importantly, the pipeline characteristic matching problem in the circulating cooling water system is solved. By adopting the tailor-made water pump to meet actual needs, the efficiency of the machine set is more than 15% higher than that of the original pump, the cavitation erosion phenomenon is remarkably relieved, the electric motor is protected, the service life is longer, the energy saving effect is greatly improved to reach above 25%, and the actual operation efficiency of the system is greatly improved.

A fluid end assembly includes a fluid end and a plurality of valve assemblies each located within a cavity that has curved internal profiles. The curved internal profiles of the cavities are concaved outward. A plunger is included to provide variations in pressure within the fluid end so as to facilitate movement of the working fluid. A discharge plug is included in communication with the fluid end. The discharge plug may include a curved profile along an inner surface that corresponds with one of the cavities therein. A suction plug is releasably coupled to the fluid end and includes a curved profile along an inner surface. The suction plug also includes a recess for acceptance of a spring retainer. The spring retainer is included to support a suction valve assembly.

A method for controlling a histotripsy using a confocal fundamental and harmonic superposition combined with hundred-microsecond ultrasound pulses, including: 1) positioning a target tissue by a monitoring and guiding system and adjusting a position of the target tissue to a focal point of a transducer; 2) first stage: controlling the confocal fundamental and harmonic superposition combined with hundred-microsecond ultrasound pulses to form a shock wave in a focal zone; wherein a negative acoustic pressure exceeds a cavitation threshold; an inertial cavitation occurs to generate boiling bubbles; the boiling bubbles collapse and achieve partial homogenization of the target tissue; 3) second stage: controlling the confocal fundamental and harmonic superposition combined with hundred-microsecond pulsed-ultrasound sequences to simultaneously irradiate a target zone and further mechanically disintegrate and homogenize the target tissue.

A high pressure common rail fuel system is provided including a fuel supply, a high pressure pump assembly fluidly connected to receive fuel from the fuel supply, and a gas supply system fluidly connected to provide gas to the high pressure pump assembly to create a high pressure gas fuel mixture. A common rail fuel system is fluidly connected to the high pressure pump assembly to receive the high pressure gas fuel mixture.

The invention relates to a method reducing cavitation on the surface of a half-balanced suspension rudder leaf at the tail of the ship. The method adopts the measures in the area of the half-balanced suspension rudder leaf which is easy to be cavitated: (1) the right angle at the riverside position at the lower edge of the rudder leaf is changed into fillet; (2) a guide fin is additionally added at the vertical rudder from the lower edge of the rudder leaf to the midpoint of the central line of the oar shaft; (3) a guide bar is additionally added nearby the frontage of the connection between the rubber supporting and the rudder leaf. After adopting the method of the invention, the change of the linetype of the tangential plane of the rear rudder is flat, and the vortex cavitation of a prop can still keep vortex cavitation when floats to the lower edge of the rudder leaf and does not cavitate the rudder leaf at the position; when the rudder angle turns to a certain angle, the prop vortex cavitation floated to the position does not change the performance owning to the demulcent change of pressure field; meanwhile, with the wake flow continuing to drift to the rear of the ship, the added guide bar can reduce the water flux flowing to the clearance and leads the water flow to stably slide by; meanwhile, the unavoidable cavitation is guided out of the surface of the rudder surface, thus relieving the cavitation phenomenon at the position.

A method of reducing underwater hydrofoil cavitation is described; hydrofoil steering vanes trade a small degree of efficiency for significant cavitation reduction, through perforations in the hydrofoil. Some pattern examples are discussed. A method of further cavitation reduction through surface texture variation also reduces underwater hydrofoil drag; some patterns are discussed. Combining the methods provides maximum cavitation reduction.

The invention discloses a gas-liquid dispersing and stirring device and belongs to the technical field of fluid mixing. Every blade of the gas-liquid dispersing and stirring device consists of a radially extending and highly shrinking concave, the vertex of the concave is positioned at the intersection position of the concave and a disk plane and extends perpendicularly along the tangential direction. The upper half and the lower half of an inner margin curve of every concave are asymmetric, the upper half extension length is greater than the lower half extension length, but the upper half and the lower half of an outer margin curve of the concave are symmetric; the vertical height of the inner margin of the concave is greater than that of the outer margin thereof, but the tangential extension length of the outer margin of the concave is greater than that of the inner margin thereof. The inner sides of the blades are beneficial to catching ascending bubbles and making the same disperse into a liquid phase, and in an outward extension process of the blades, the vertical height of every blade decreases gradually. The gas-liquid dispersing and stirring device has the advantages of low power consumption, high gas-liquid dispersion efficiency and mixing performance and capability of dispersing gas into a liquid phase system or liquid-solid system in an efficient energy-saving way.

Disclosed is a liquid-sealed vibration isolator (10) provided with a main liquid chamber (42), a portion of the chamber wall of which is formed from a vibration isolating base (16), a subsidiary liquid chamber (44), a portion of the chamber wall of which is formed from a first diaphragm (38), and a first orifice flow path (50) which connects both liquid chambers, wherein a high-frequency second orifice flow path (54) which connects the main liquid chamber (42) and the subsidiary liquid chamber (44) is formed on a partitioning body (40), and a second diaphragm (60) is provided on the opening (59A) of the second orifice flow path (54) on the side of the main liquid chamber. The outer peripheral portion (60A) of the second diaphragm is held by the partitioning body (40) in a liquid-tight manner, and the second diaphragm (60) abuts the peripheral edge portion of the opening (54A) so as to block said opening with a flexible membrane section (60B) which is provided on the inside of the second diaphragm (60). Moreover, a through hole (74) is disposed on the flexible membrane section (60B) at a position which does not overlap the opening (54A).

The invention provides a novel efficient hydrofoil. The novel efficient hydrofoil comprises hydrofins and a hydrofoil strut. The hydrofins are fixedly mounted below a naval ship through the hydrofoil strut, and the outer surfaces of the hydrofins are provided with antidrag structures composed of rough belts, grooves, pits or texture structures. The hydrofins with the antidrag structures have high lift-drag ratio when moving in the water, frictional drag and viscous drag of the hydrofoil to the water can be reduced, energy efficiency of driving delivery tools such as foilcrafts can be improved, and the novel efficient hydrofoil has the advantages that ship navigation speed is improved and energy conservation and emission reduction are realized.