946results about How to "Avoid cavitation" patented technology

Methods and systems for noninvasive mastopexy through deep tissue tightening with ultrasound are provided. An exemplary method and system comprise a therapeutic ultrasound system configured for providing ultrasound treatment to a deep tissue region, such as a region comprising muscular fascia and ligaments. In accordance with various exemplary embodiments, a therapeutic ultrasound system can be configured to achieve depth from 1 mm to 4 cm with a conformal selective deposition of ultrasound energy without damaging an intervening tissue in the range of frequencies from 1 to 15 MHz. In addition, a therapeutic ultrasound can also be configured in combination with ultrasound imaging or imaging / monitoring capabilities, either separately configured with imaging, therapy and monitoring systems or any level of integration thereof.

Shock absorber components, such as a radial bypass damper, an anti-cavitation valve (ACV) and an incremental flow metering valve IFMV. The damper is of a continuous, unitary construction with a main hole and auxiliary holes interconnected by passageways. The ACV has openings that angle obliquely relative to entry surfaces of valving shims and extend at an incline continuously through the valving shims. The metering valve linearly regulates flow, substantially independent of piston displacement.

Shock absorber components, such as a radial bypass damper, an anti-cavitation valve (ACV) and an incremental flow metering valve IFMV. The damper is of a continuous, unitary construction with a main hole and auxiliary holes interconnected by passageways. The ACV has openings that angle obliquely relative to entry surfaces of valving shims and extend at an incline continuously through the valving shims. The metering valve linearly regulates flow, substantially independent of piston displacement.

A running control device for a watercraft controls propulsion force and tilt angle of a propulsion device relative to the hull of the watercraft. The running control device also sets an optimum trim angle automatically. The running control device includes a propulsion force control section that controls the propulsion force of the propulsion device. The running control device also includes a tilt angle control section that controls the tilt angle of the propulsion device. A target propulsion force calculation module responds to first input information (e.g., watercraft velocity) to calculate a target propulsion force. An amount-of-operation calculation module responds to second input information to calculate an amount of operation of the propulsion device to produce the target propulsion force. The tilt angle control section includes a tilt angle calculation module that determines the tilt angle based on the propulsion force.

A magnetorheological damper system comprising a reservoir in communication with a damper. The damper comprises a damper cylinder defining a damper chamber, wherein the damper chamber contains a magnetorheological fluid and a movable damper piston. The damper piston comprises at least two coil windings on the outer surface of the damper piston, wherein the damper piston is capable of generating a magnetic field between the damper piston and a wall of the damper cylinder. The reservoir comprises a reservoir cylinder defining a passageway, wherein the reservoir includes a magnetorheological electromagnet capable of generating a magnetic field between the magnetorheological piston and a wall of the passageway. The combination of the an MR reservoir and MR damper leads to a damping system capable of damping a wide range of extreme forces.

A magnetorheological damper system comprising a reservoir in communication with a damper. The damper comprises a damper cylinder defining a damper chamber, wherein the damper chamber contains a magnetorheological fluid and a movable damper piston. The damper piston comprises at least two coil windings on the outer surface of the damper piston, wherein the damper piston is capable of generating a magnetic field between the damper piston and a wall of the damper cylinder. The reservoir comprises a reservoir cylinder defining a passageway, wherein the reservoir includes a magnetorheological electromagnet capable of generating a magnetic field between the magnetorheological piston and a wall of the passageway. The combination of the an MR reservoir and MR damper leads to a damping system capable of damping a wide range of extreme forces.

A switching circuit for an electromagnetic source for generating acoustic waves has at least one first capacitor connected in parallel with a series circuit formed by a second capacitor and an electronic switch. The switching circuit is connected to a coil of the electromagnetic source, and the first and second capacitors are switched so as to both discharged into the coil, thereby supplying the coil with current.

Shock absorber components, such as a radial bypass damper, an anti-cavitation valve (ACV) and an incremental flow metering valve IFMV. The damper is of a continuous, unitary construction with a main hole and auxiliary holes interconnected by passageways. The ACV has openings that angle obliquely relative to entry surfaces of valving shims and extend at an incline continuously through the valving shims. The metering valve linearly regulates flow, substantially independent of piston displacement.

A two-phase liquid cooling system includes an active venting system for regulating an amount of non-condensable gas within the cooling system. Various venting structures may be used to remove gases from the cooling system, some of which are designed to remove the non-condensable gases and avoid removing the vapor-phase coolant. A control system activates the venting system to achieve a desired pressure, which may be based on measured process conditions within the cooling system.

A system for transmitting power hydraulically to and from the wheels of a motor vehicle includes an accumulator containing fluid at relatively high pressure, a reservoir containing fluid at lower pressure, and a pump / motor driveably connected to the wheels and having a variable volumetric displacement for pumping fluid between the accumulator and the reservoir. A first circuit connects the inlet to the reservoir and the outlet to the accumulator. A second circuit includes a first path having a low flow rate capacity, a second path having a higher flow rate capacity. A controller switches between pumping operation and motoring operation, opens and closes the first path during motoring operation, and reduces the displacement before switching between pumping operation and motoring operation.

This invention relates to a double- cycle high efficient heat pipe heat exchanging system that can control the heat exchanging quantity. There are evaporator and condenser two types of heat exchangers. The number of each type is one or several that formed by connected in parallel. This system includes: condensate supplying and distributing system; gas-liquid two phases flowing and separating system; gaseous phase transmitting and distributing system, liquid phase collecting and storing system; heat exchanging quantity controlling system. The evaporator of heat pipe, condenser, gas-liquid separator, liquid storage, solution circulating pump, liquid distributor, the connecting pipeline and related controlling parts are connected together to form the double cycles controllable heat pipe system. The solution pump, liquid distributor, evaporator and gas-liquid separator are connected together to form independent working fluid cycle, which settle the problems that working fluid carrying capacity is not enough and liquid distribution is uneven.

A pressure intensifier for fluids has an intensifier piston with a high-pressure piston and a low-pressure piston having a greater diameter than the high-pressure piston. The pistons are moveable in a high-pressure cylinder and a low-pressure cylinder, respectively, and move together. The high-pressure cylinder is connected to a high-pressure connection. A first control line is connected to a supply connector. A second control line is connected to a control valve having first and second switching positions. A first connection connects the control lines. The low-pressure cylinder is connected via the control valve in the first switching position to a supply connector and in the second switching position to a return connector. The switching positions are controlled by the intensifier piston. The intensifier piston opens or closes the first connection between the control lines. The first connection is arranged completely within a movement stroke of the high-pressure piston.

Shock absorber components, such as a radial bypass damper, an anti-cavitation valve (ACV) and an incremental flow metering valve IFMV. The damper is of a continuous, unitary construction with a main hole and auxiliary holes interconnected by passageways. The ACV has openings that angle obliquely relative to entry surfaces of valving shims and extend at an incline continuously through the valving shims. The metering valve linearly regulates flow, substantially independent of piston displacement.

A sliding component, which achieves both sealing and lubrication by preventing cavitation from occurring in the dynamic-pressure generation mechanism and thereby solving the problem of leakage that will otherwise result from such cavitation, is characterized in that, on a sealing face of one of a pair of sliding parts that slide against each other, extremely shallow grooves constituting a Rayleigh step mechanism are provided in a manner facing the high-pressure fluid side of the sealing face, while deep fluid-introduction grooves for introducing the high-pressure fluid are provided on the upstream side of the extremely shallow grooves in a manner continuing to the high-pressure fluid side.

A torque converter includes an impeller shell and a backing plate defining at least a portion of a first hydraulic chamber, a cover and a piston plate defining at least a portion of a second hydraulic chamber, and a third hydraulic chamber. The third chamber is sealed from the first and second hydraulic chambers such that a hydraulic flow between the third chamber and the other chambers is at least restricted. In an example embodiment, the first chamber is for being pressurized to prevent cavitation in the turbine, stator, or impeller, the second or third chamber is for being pressurized to engage the lockup clutch, and the other of the second or third chamber is for being de-pressurized to reduce a back pressure on the lockup clutch piston plate.

An automotive engine oil pump assembly having first and second pump mechanisms contained within a common housing. A shaft rotatably supported in the housing drives the pump mechanisms in a conventional manner. The pump mechanisms are offset in phase to reduce flow pulsations through the housing and limit pump noise and vibration. The first pump mechanism communicates with a common inlet and first outlet of the housing. The second pump mechanism communicates with the common inlet and second outlet of the housing. A common reservoir connected to inlets of the first and second oil pump mechanisms provides a supplemental oil source to balance oil pressures at the pump inlets to prevent pump cavitation and further reduce pump noise and vibration.

A two-phase liquid cooling system includes an active venting system for regulating an amount of non-condensable gas within the cooling system. Various venting structures may be used to remove gases from the cooling system, some of which are designed to remove the non-condensable gases and avoid removing the vapor-phase coolant. A control system activates the venting system to achieve a desired pressure, which may be based on measured process conditions within the cooling system. A venting and refilling system may serve multiple cooling systems in a parallel arrangement.

A system according to this invention for transmitting power hydraulically to and from the wheels of a motor vehicle includes an accumulator containing fluid at relatively high pressure, a reservoir containing fluid at lower pressure, and a pump / motor driveably connected to the wheels and having an inlet, an outlet, and a variable volumetric displacement for pumping fluid between the accumulator and the reservoir. A first circuit connects the inlet to the reservoir and the outlet to the accumulator. A second circuit, which connects the inlet to the accumulator and the outlet to the reservoir, includes a first path having a low flow rate capacity, a second path having a higher flow rate capacity. A controller switches between pumping operation and motoring operation, opens and closes the first path during motoring operation, and reduces the displacement before switching between pumping operation and motoring operation. The first path includes a first valve responsive to the controller for opening and closing a connection between the accumulator and the inlet, and a first orifice arranged in series with the first valve having a relatively low flow rate capacity. The second path, arranged in parallel with the first path between the accumulator and the inlet, includes a second valve responsive to the controller for opening and closing a connection between the accumulator and the inlet, and a second orifice arranged in series with the second valve having a higher flow rate capacity than that of the first orifice.

A dual pumping element fluid system for an engine or other system which reduces the driving power consumption by unloading one pumping element through the use of recirculation when a fluid pressure target value is achieved. A cross-over port fluid system prevents cavitation of the unloaded pump. A pressure-activated flow control valve mechanism is utilized to open and close the passageways from the secondary pump. The fluid system works in conjunction with an engine balance shaft system to control gear rattle at low speeds without adding undue gear loads at high speeds.

The present invention is directed to methods and apparatus for using a formation tester to perform a pretest, in a formation having low permeability, by intermittently collecting a portion of fluid at a constant drawdown rate. The drawdown pressure is monitored until a maximum differential pressure is reached between the formation and the tester. Then the piston is stopped until the differential pressure increases to a set value, at which time the piston is restarted. The controlled intermittent operation of the piston continues until a set pretest volume is reached. The modulated drawdown allows for an accurate collection of pressure versus time data that is then used to calculate the formation pressure and permeability. The present invention also finds applicability in logging-while-drilling and measurement-while drilling applications where power conservation is critical.

The invention discloses a cooling system of a flywheel energy storage device. The flywheel energy storage device consists of a shell and an internal disc-type motor, wherein the shell has a vacuum sealing structure; an upper oil cavity and a lower oil cavity are respectively arranged at the upper part and lower part of the shell; the shell internally comprises at least one set of flywheel; a center shaft of each flywheel is a hollow mandrel, and an axle hole is formed in the center of the center shaft and is communicated with the upper oil cavity and the lower oil cavity; an oil tank is arranged outside the shell; the oil tank is communicated with the upper oil cavity by an upper oil pipe and is communicated with the lower oil cavity by an oil return pipe; the oil return pipe is provided with a third valve, an oil pump and a radiator. The cooling system can be used for cooling a rotor by the axle hole, so that a great deal of heat of the rotor which rotates at a high speed can be taken away in time, and safe and stable operation of the flywheel energy storage device is guaranteed. An upper bearing, a lower bearing and a stator disc are cooled in time by part of cooling oil, and the bearings can be lubricated, so that the reliable work of key parts can be guaranteed, and the defects of cavitation and the like of a pump caused by low pressure can be avoided.

A process and apparatus is provided for burning liquid ammonia in an energy device such as a diesel engine, boiler or gas turbine. In particular, the process and apparatus include mixing a renewable fuel with a low flame speed and high ignition temperature, e.g., ammonia, with a combustible liquid fossil or bio-fuel and supplying the mixture into a closed fuel loop where part is efficiently burned in an engine combustion chamber, and part is used to cool the engine and returned by the loop for mixture with fresh incoming fuel mixture. The invention provides for the mixing and emulsifying in such a way that vapour lock is avoided. In the loop, the mixture is emulsified into a disperse distribution of fuel droplets such that upon injection of a portion into the combustion chamber, the renewable fuel in an emulsified droplet evaporates, mixes with the air and forms a small combustion cell surrounding the liquid fuel droplet. The fuel droplet burns and then serves as an ignition kernel for the gas mixture in the small combustion cell producing efficient and rapid combustion of the renewable fuel. The fuel loop allows the fuel system to automatically scale for engines varying in power output from 1 to 35,000 horsepower.

The invention relates to an embedded micro streamline axial flow blood pump, which can be used for assisting blood circulation of failed heart. The blood pump comprises a pump body arranged in a sleeve body and a driving device arranged outside the pump body, wherein the pump body comprises the sleeve body, a front guide vane, a rotor and a back guide vane; the hubs of the front guide vane, a rotor and the back guide vane are designed integrally in an integral streamline form; and the front half part of the rotor is provided with an inductive blade. The blood pump can reduce the on-way pressure loss of the blood in the flow channel of the blood pump, improve efficiency and reduce hemolysis; and can promote the circumferential speed of the blood after entering into a rotor area due to the inductive blade arranged on the front half part of the rotor, and avoids the occurrence of vacuole phenomenon.

The invention relates to a piezoelectric stack pump, which belongs to a piezoelectric driver. A stack support body is permanently connected with a supporting block. A group of belleville springs are sheathed on a plunger. Two fixing nuts are connected with the plunger though thread. Piezoelectric stacks are arranged on the fixing nuts. A lower cover permanently connects a valve base and a metallic seal diaphragm with the supporting block. The plunger is permanently bonded with the metallic seal diaphragm. An intake one-way valve is permanently connected with the valve base. A water outlet one-way valve is permanently connected with the valve base. The metallic seal diaphragm and the valve base form a working chamber. A cushion chamber is formed between the lower cover and the valve base. The lower cover is provided with an intake and a water outlet, and is connected with the cushion chamber. The cone angles of the intake and the water outlet are 30 degrees to 40 degrees. The invention is a novel piezoelectric stack pump with simple structure, large flow, high output pressure, simple process, stable performance and high precision.

This invention refers to a method about low-temperature multiple-effect desalination of sea water, especially about a new method which effectively applied thermal pumping power-saving technology to desalination of sea water. The desalination of sea water system which apply this method has n effect evaporator(n=2-50) and one condensator aggregately, containing six systems of feeding seawater, recirculated salt water, product water, vacuum, incoagulable gas removal, thermal pumping circulation and starting heating in addition. This invention is based on irreversible thermodynamics principle, via organic integration of evaporator, condensator and low-temperature multiple-effect desalination of sea water system in closed circuit thermal pumping system, as well as special design of energy recovery tache in low-temperature multiple-effect desalination of sea water, decreasing irreversible loss of diversified thermal transmission course which the desalination of sea water refers to in maximum limit, sequentially letting the entropy increasing of whole desalination of sea water course be the least, realizing efficient energy-saving desalination of sea water course.

The present invention provides an axially-rotated valve which permits increased flow rates and lower pressure drop (characterized by a lower loss coefficient) by using an axial eccentric split venturi with two portions where at least one portion is rotatable with respect to the other portion. The axially-rotated valve typically may be designed to avoid flow separation and / or cavitation at full flow under a variety of conditions. Similarly, the valve is designed, in some embodiments, to produce streamlined flow within the valve. An axially aligned outlet may also increase the flow efficiency. A typical cross section of the eccentric split venturi may be non-axisymmetric such as a semicircular cross section which may assist in both throttling capabilities and in maximum flow capacity using the design of the present invention. Such a design can include applications for freeze resistant axially-rotated valves and may be fully-opened and fully-closed in one-half of a complete rotation. An internal wide radius elbow typically connected to a rotatable portion of the eccentric venturi may assist in directing flow with lower friction losses. A valve actuator may actuate in an axial manner yet be uniquely located outside of the axial flow path to further reduce friction losses. A seal may be used between the two portions that may include a peripheral and diametrical seal in the same plane. A seal separator may increase the useful life of the seal between the fixed and rotatable portions.

The invention discloses a serial axial-flow water jet propulsion pump which comprises a water suction elbow (1), a pump shaft (7), an impeller chamber (6), an inducer (2) and a main impeller (3), wherein the inducer (2) and the main impeller (3) are positioned in the impeller chamber (6); the pump shaft (7) is horizontally arranged; the inducer (2) and the main impeller (3) are fixed on the pump shaft (7) through keys; the outlet of the water suction elbow (1) is connected with the inlet of the inducer (2); the outlet of the main impeller (3) is orderly connected with a rectifier (4) and a jet pipe (5); and the area of the overflowing cross section gradually reduces along the central line of the flow channel to form a contracting flow channel. The invention avoids cavitation in the main impeller, solves the problems of cavitation under the operating conditions of large thrust and high speed of the water jet propulsion pump and reduces the axial size of the propulsion pump.

The invention relates to an active hydraulic damper specially for railway vehicles, comprising a hydraulic cylinder, an electric motor, a hydraulic accumulator, at least a pump and at least a control valve. According to the invention, all components of the active hydraulic damper are arranged at the hydraulic cylinder.

A MagnetoRheolocial Fluid Elastic (MRFE) lag damper system for adaptive lead-lag damping of helicopter main rotors. Embodiments include snubber dampers especially for hingeless helicopter rotors, and concentric bearing dampers. The snubber lag dampers include a flexible snubber body defining a cavity, a flexible or rigid interior (e.g., center) wall subdividing the cavity, and a flow valve in the interior wall or external to the cavity. The flexible snubber body may comprise elastomeric materials and metal rings stacked together to create a sealed MR fluid cavity. The shear deformation of the snubber body induces MR fluid flow through the valve, controlled by a magnetic field in the valve. An MRFE concentric bearing damper is also disclosed, comprising a pair of concentric tubes with elastomeric material injected and cured in an annular gap between the two tubes, and an MR fluid reservoir with piston-mounted MR valve housed inside the innermost tube.