447results 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).

In the embodiments described in the specification, a rim-driven propulsion pod arrangement has a cylindrical housing with a duct providing a flow path for water and a rotor assembly supported from a central shaft and containing a rotating blade row and driven by a rim drive permanent magnet motor recessed in the housing. An array of vanes downstream from the rotating blade row is arranged to straighten the flow of water emerging from the rotating blade row. Radial bearing members on the rotor have a hardness less than that of the shaft on which the rotor is supported and relatively soft protrusions are provided in the space between the rotor and the housing to limit excursion of the rotor. A thrust bearing has wedges arranged to form a water wedge between facing surfaces of the rotor and the rotor support during rotation of the rotor.

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.

Apparatus for the ultrasonic treatment of tissue, including: a housing having a space therewithin and an opening adapted for placement against the tissue, the housing being adapted for introducing liquid therein such that when so placed, the space is filled with liquid; and an ultrasonic power source that introduces ultrasonic vibrations toward the damaged tissue, said vibrations having a frequency and power level sufficient to produce cavitation of the liquid at or near the surface of the tissue.

A variable marine jet propulsion system incorporates a motor, a variable-pitch propeller pump in a spherical housing, a variable housing and a variable inlet duct, and a microcontroller. The pump, the nozzle and the inlet are controlled by the microcontroller, which is programmed to control the pump as a continuously variable power transmission for maintaining efficient motor operation, the nozzle for maintaining efficient pump operation, and the inlet for maintaining efficient recovery of the total dynamic head of the incoming water. The spherical pump housing maintains close fits to the propeller vane tips for more efficient operation at all pitches, including zero and reverse pitches. Zero pitch results in no effective pumping action, effectively a true neutral in fluid power transmission. Reverse pitch in combination with the large variable nozzle provides reverse flow and consequently reverse thrust, which eliminates the need for the “backing bucket”.

A variable displacement vane-type fluid pump is provided which permits improved regulation of the pump discharge such that the pump can meet the various requirements of lubrication for internal combustion engines at all speeds with minimized use of power. Of course, the vane pump may also be utilized in a wide range of power transmission and other fluid distribution applications. The variable displacement vane pump of the invention may utilize both hydrostatic and mechanical assistance in radially positioning its vanes to ensure efficient and quiet operation of the pump and to facilitate priming of the pump. The vane pump of the invention may also use both hydrostatic and mechanical actuators to control the position of its containment ring or eccentric ring and hence, regulate the output of the pump. According to yet another aspect of the present invention, to prevent inlet flow restriction or cavitation, a valve may be provided to permit some of the pump outlet or discharge flow to bleed into the pump inlet to provide needed velocity and energy to the fluid flow into the pump inlet.

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).

A valve includes a body, a throttling ball, and a shoe. The body includes an upstream flow passage and a downstream flow passage in fluid communication with an interior cavity of the body. The throttling ball is rotatable within the interior cavity on an axis to adjust the valve from a closed position to an open position and includes a fluid conduit extending through the throttling ball, where the fluid conduit is alignable with the upstream flow passage and the downstream flow passage. The shoe is disposed in the cavity abutting an interior surface of the cavity and includes a fluid passage there through having an inlet being alignable with the flow conduit of the throttling ball and an outlet being alignable with the downstream flow passage of the body. The interior surface of the shoe is disposed adjacent to and tracking an external surface of the throttling ball.

A boat stabilizer that is attachable to the anti-cavitation plate or other structure of the lower drive unit of a boat motor without permanently modifying the structure of the anti-cavitation plate or other structure is provided. The shape and size of the boat stabilizer causes the stabilizer to effectively harness and control the thrust energy generated by the propeller resulting in improved thrust and fuel efficiency. Due to various features, the drag associated with the boat stabilizer is kept to a minimum. Finally, decals and other decorative elements are integrally embedded into the top surface of the inventive boat stabilizer using in-mold decoration (“IMD”) technology which makes the elements resistant to ultra-violet light, virtually indestructible and highly appealing. A boat motor, a method of attaching a boat stabilizer to a boat motor and a method of molding a boat stabilizer having at least one decorative element integrally embedded in the top surface thereof are also provided.

A sacrificial body mitigates cavitation damage to components within a pump. The sacrificial body is mounted in the pump so that flowing fluid passes over the sacrificial body, which causes the sacrificial body to shed electrons into the flowing fluid in the vicinity of the cavitation. The excess electrons tend to suppress hydrogen ions from releasing, which can mitigate cavitation. The sacrificial body is formed of a material having less resistance to corrosion due to the flowing fluid than the components of the pump. Needles are attached to the sacrificial body for immersion in the flowing fluid to facilitate the release of the electrons for the sacrificial body.

A system having reduced gas interference that includes a fluid chamber and a resonant sensor device in fluid communication with a fluid in the fluid chamber. The system includes a fluid control device adapted to change at least one of the fluid flow or pressure within the fluid chamber to achieve substantial wetting of surfaces in proximity to the resonant sensor device. Fluid surfaces of the system can include a material to increase the wettability (e.g., hydrophilicity) of the fluid surfaces.

The invention relates to a multi-cavity baffle type electrolytic milling and grinding complicated machining tool cathode and a method and belongs to the field of electrolytic milling and grinding complicated machining. According to the multi-cavity baffle type electrolytic milling and grinding complicated machining tool cathode and the method, by arranging a plurality of sector-shaped blind hole cavities in the tool cathode, and arranging an annular baffle above a cathode diamond abrasive particle layer, the defect that supplied liquid in a machining gap is not sufficient is overcome, the flow field uniformity is improved, and the stability and the machining precision of electrolytic milling and grinding complicated machining are effectively improved.

A system and method for reducing or eliminating pump cavitation in a closed system having at least one or a plurality of fluid phase changes. The system comprises a venturi having a throat which is coupled to a reservoir tank.

A country comprehensive sewage treatment system and country comprehensive sewage treatment method belongs to the technical field of water treatment. The system includes, in a successively connected manner, a pre-treatment system for filtering suspended solids in water, a container-type integrated water treatment system, a soil infiltration system, a solar energy power supply system for supplying power to the container-type integrated water treatment system, and a process management system. The system and the method achieve dispersion and separation and integrated treatment of country comprehensive sewage, is convenient to operate and manage, is suitable for distribution characteristics of water quality and water amount of country household sewage and cultivation sewage, and overcome defects in country comprehensive sewage mixed treatment and household dispersed treatment in the prior art.

The present invention discloses waterproof and oil-proof agent for papermaking industry. Acrylate monomer, cation monomer and fluroric monomer as well as dispersing emulsifier, initiator and stabilizer are emulsion polymerized under the synergistic action of ultrasonic wave irradiation and microwave irradiation to prepare the emulsified waterproof and oil-proof agent. The waterproof and oil-proof agent is added into the paper pulp or painted to the surface of paper, and can raise the water preventing and oil preventing function obviously.

The invention discloses an orifice-plate type adjustable throttle valve and a manufacturing method of the orifice-plate type adjustable throttle valve. The orifice-plate type adjustable throttle valve comprises a valve body, a valve cover, a valve rod and valve plates, wherein at least one through hole 26 is axially arranged on each of two disk type valve plates 4, so that under the situation of same flow, not only the escaping volume of gas phase components in a pipeline is increased, but also dead area accumulation of dinas at the entrance of the orifice plate of the throttle valve and occurrence of cavitation erosion of the gas are reduced; most importantly, the exit of the orifice plate with a plurality of orifices is positioned at an intersectional zone of high-pressure jet, multiphase fluid forms a hedging energy consumption depressurizing area, so as to reduce internal kinetic energy of high-speed fluid and scour to the wall of the pipe, so that the service life of the throttle valve is greatly improved; for an equally grading throttling depressurizing pipeline, the orifice-plate type adjustable throttle valve can reduce throttling grade number of the pipeline to reduce the operating cost of a company. The orifice-plate type adjustable throttle valve can be widely applied in fields such as metallurgy, mine, infrastructure, wastewater treatment, and port shipping, as well as in pipelines for conveying multiphase mixed fluid in industries.

A marine propulsion device such as an outboard motor includes a submersible electric motor having a propeller connected directly with the drive shaft of the motor. The motor is an efficient brushless motor having symmetrical elliptical coils connected with a stator which generate magnetic flux when current is passed through the coils to rotate a rotor for driving the drive shaft. The motor is arranged in a housing having a nozzle connected with a rear portion thereof which surrounds the propeller to reduce cavitation. Cooling fins are provided on the outer surface of the housing to assist with cooling the motor and a motor controller arranged in the housing.