5344results about "Fluid-pressure actuator components" patented technology

Hydraulic fill and drain of a clutch chamber is controlled with a blocking valve and a trim valve. The blocking valve selectively provides pressurized fluid to the trim valve which in turn selectively provides the pressurized fluid to the clutch chamber. Exhausting of the clutch chamber is effected through one of two alternate paths utilizing deactivation of one of the trim and blocking valves. Back up exhausting of the clutch chamber is effected through the other of the alternative paths. Such system allows for determination of valve failures and continued operation until such failures can be rectified.

Micro-fluid devices and methods for their use are provided. The subject devices are characterized by the presence of at least one micro-valve comprising a phase reversible material, e.g. a reversible gel, that reversibly changes its physical state in response to an applied stimulus, e.g. a thermoreversible gel. In using the subject device, fluid flow along a flow path of the device is modulated by applying an appropriate stimulus, e.g. changing the temperature, to the microvalve. The subject devices find use in a variety of applications, including micro-analytical applications.

A microfluidic device comprises first and second inlet passages (13) for respective immiscible fluids, these inlet passages merging into a third passage (8) along which the two fluids flow under parallel laminar flow conditions, the third passage being formed with a constriction or other discontinuity (9) causing the two fluids to form into a flow of alternate segments.

The invention relates to systems and methods for rapidly and isothermally expanding and compressing gas in energy storage and recovery systems that use open-air hydraulic-pneumatic cylinder assemblies, such as an accumulator and an intensifier in communication with a high-pressure gas storage reservoir on a gas-side of the circuits and a combination fluid motor/pump, coupled to a combination electric generator/motor on the fluid side of the circuits. The systems use heat transfer subsystems in communication with at least one of the cylinder assemblies or reservoir to thermally condition the gas being expanded or compressed.

A microfluidic system includes a bubble valve for regulating fluid flow through a microchannel. The bubble valve includes a fluid meniscus interfacing the microchannel interior and an actuator for deflecting the membrane into the microchannel interior to regulate fluid flow. The actuator generates a gas bubble in a liquid in the microchannel when a sufficient pressure is generated on the membrane.

In order to provide a construction machine by which energy regeneration can be performed reliably and battery and electrical power generator can be miniaturized, a construction machine has an engine, a hydraulic pump driven by the engine, and an actuator driven by discharge oil from the hydraulic pump, and a regenerative motor which rotates by return oil from the actuator is connected to the rotation shaft of the hydraulic pump. The hydraulic pump is driven by the engine and the regenerative motor when drive torque necessary in the hydraulic pump is larger than output torque generated by operation of the regenerative motor. Meanwhile, the hydraulic pump is driven by the regenerative motor when the drive torque of the hydraulic pump is smaller than output torque of the regenerative motor, and an electrical power generator connected to the rotation shaft of the hydraulic pump is operated to generate electricity by excess torque which has not been energy-regenerated in the hydraulic pump so that this generated electrical power is charged in a battery.

An energy recovery system for a machine is disclosed. The energy recovery system may have a pump configured to provide a flow of pressurized fluid. The energy recovery system may also have a first fluid actuator with a first chamber and a second chamber and being configured to receive the pressurized fluid, a second fluid actuator with a third chamber and a fourth chamber and being configured to receive the pressurized fluid, and a first valve fluidly connected between the pump and the first and second actuators. The energy recovery system may additionally include an isolation unit with a first selectively restrictable passageway fluidly connecting the first chamber, the third chamber, and a first outlet of the first valve, and a second selectively restrictable passageway fluidly connecting the second chamber, the fourth chamber, and a second outlet of the first valve, as well as an energy recovery unit in fluid communication with the isolation unit. The isolation unit may be configured to direct a flow of pressurized fluid from the second actuator to the energy recovery unit. The energy recovery unit may be configured to convert the flow of pressurized fluid to a first mechanical power output.

The invention relates to a microfluidic device for making a liquid/liquid or gas biphasic system using a first liquid or a gas and a second liquid, non-miscible with each other, the device having a first hydrophobic surface for the second liquid, the first liquid forming a layer (6) on said first hydrophobic surface. The device comprises means for introducing a drop (7) of the second liquid into the layer of first liquid or gas and in contact with said first hydrophobic surface, and means for displacing the drop on said first hydrophobic surface along a determined path, the device having on the path of the drop, at least one wetting defect causing, upon passing of the drop over this defect, failure of the triple line of contact of the drop on the first hydrophobic surface and inclusion of first liquid (8) or gas into the drop.

The invention also relates to the associated method.

A hydraulic system has a valve assembly with two workports coupled to chambers of first and second cylinders which are connected mechanically in parallel to a machine component. A separation control valve is connected between first chambers of both cylinders, and a shunt control valve is connected between the workports. A recovery control valve couples an accumulator to the first chamber of the second cylinder. Opening and closing the valves in different combinations routes fluid from one or both cylinders into the accumulator where the fluid is stored under pressure, and thereafter enables stored fluid to be used to power one or both cylinders. The shunt control valve is used to route fluid exhausting from one chamber of each cylinder to the other chambers of those cylinders. Thus the hydraulic system recovers and reuses energy in various manners.

Methods of fabricating high-k dielectric layers having reduced impurities for use in semiconductor applications are disclosed. The methods include the steps of: forming a stacked dielectric layer having a first dielectric layer and a second dielectric layer formed on a semiconductor substrate using an ALD method, in combination with a post-treatment step performed to the stacked dielectric layer. The steps of forming the stacked dielectric layer and performing the post-treatment are repeated at least once, thereby fabricating the high-k dielectric layer.

A driving device of a work machine includes a power generator adapted to be driven by an engine, and a power storage device for storing the electric power generated by the power generator. Electric motors and a motor generator, both adapted to be operated by electric power supplied from either one or both of the power generator and the power storage device respectively drive pumps and a pump motor. Supporting circuits for feeding supporting hydraulic oil are provided between a plurality of driving circuits that drive a plurality of hydraulic actuators of a working unit by oil hydraulics generated by the pumps and the pump motor. By enabling the plurality of driving circuits to effectively share excess energy, the invention makes possible a compact construction of a driving device of a work machine.

A hybrid machine with a hydraulic drive device having hydraulic actuators allowed to operate against and by external loads is provided. To this end, the hybrid machine comprises hydraulic cylinders (7), first hydraulic pumps (P1) connected, with closed circuits, to head side pressure receiving chambers (7S) and bottom side pressure receiving chambers (7L) of the hydraulic cylinders (7), and second hydraulic pumps (P2) connected, with open circuits, to the bottom side pressure receiving chambers (7L) and an external oil chamber (10), wherein the first and second hydraulic pumps (P1, P2) are connected to electric motors (M) so as to be driven.

The invention belongs to the technical field of compressed natural gas filling, and particularly relates to an integrated hydraulic station which realizes high integration of an oil tank, plunger pumps, motors, a valve block, a cooler, an instrument and a sensor. The reversing function of hydraulic oil is provided through cooperation of an electro-hydraulic reversing valve and a proximity switch on a hydraulic cylinder, the functions of circulating heating of the low-temperature hydraulic oil, discharging of the high-pressure hydraulic oil and avoiding the hydraulic oil channeling back betweenthe double pumps are realized through cooperation of an unloading valve, a one-way valve and the electro-hydraulic reversing valve in the valve block, the high-pressure difference automatic stop function and the high-pressure gas discharging function are provided, combustible gas leakage and expansion deformation of the oil tank which cannot be recovered caused by high-pressure gas channeling back are avoided, the functions of low oil level monitoring alarm, temperature monitoring alarm and low oil temperature automatic circulating heating before starting of the hydraulic oil tank are provided, a three-way ball valve is adopted to replace an oil return valve block in the aspect of cooling oil return of the hydraulic oil, thus the oil return control function is realize, and the cost and space of the hydraulic station are also reduced.

The present invention relates to a method for attenuating the motion of hydraulic cylinders of mobile work machinery, in particular of hydraulic excavators, in which prior to the hydraulic cylinder reaching one of the limits of travel, its motion speed is reduced, and the hydraulic cylinder is moved to the respective limit of travel at reduced speed; wherein for the purpose of reducing the speed, the inflow to, and/or the outflow from, the hydraulic cylinder are/is throttled by a flow control device. According to the invention, the method is characterized by, prior to the respective limit of travel being reached, the motion speed of the hydraulic cylinder is registered, and the point in time when throttling commences is changed depending on the registered motion speed. Furthermore, the present invention relates to a device for attenuating the motion of hydraulic cylinders of mobile work machinery, in particular of hydraulic excavators, a position registering device for registering a preliminary limit position of the hydraulic cylinder, a control device for throttling the inflow and/or outflow of the hydraulic cylinder, and a control device for controlling the flow control device when the preliminary limit position is reached. According the invention, the device has a speed registering device for registering the motion speed of the hydraulic cylinder when the preliminary limit position is reached, and the control device has a delay device for delaying driving the flow control device, depending on the recorded motion speed.

A work vehicle having a hydrostatic drive system provides for the recovery and reuse of the vehicle's kinetic energy by conducting pressurized hydraulic fluid out of the hydrostatic drive system into an accumulator during vehicle deceleration, and conducting the pressurized fluid back into the drive system during vehicle acceleration to assist the vehicle's engine in accelerating the vehicle.

The system includes a hydraulic powered actuator. A pump system having first and second hydraulic lines is coupled to the first and second ports, respectively and is capable of providing hydraulic fluid to either the first and second lines. First and second pressure sensors are coupled to the first and second lines, respectively. A third line is coupled between the first and second lines and includes first and second valves mounted in series therein. Preferably, the first and second valves are capable of latching in the open position. A reservoir is coupled to the third line between the first and second valves. A shut off valve is included for cutting off the flow from the reservoir.

A heat exchange system includes an electrode configured to electrostatically control a flow of a heated gas stream in the vicinity of a heat transfer surface and/or a heat-sensitive surface.

A hydraulic system is provided having a reservoir configured to hold a supply of fluid. The hydraulic system also has a variable displacement pump configured to supply charge fluid and pilot control fluid to the hydraulic system. In addition, the hydraulic system has a closed-loop portion configured to receive charge fluid from the variable displacement pump and drive a mechanism. The hydraulic system further has a pilot fluid supply portion configured to direct pilot control fluid from the variable displacement pump to closed-loop portion.

Generally, the invention relates to power generation and energy storage. In particular, to systems and methods for providing constant power from hydraulic inputs having widely-varying pressures. More particularly, the invention relates to hydraulic-pneumatic energy storage and recovery systems that include either a fixed or variable displacement hydraulic motor and control systems that allow a user to maintain constant power from the fixed or variable displacement hydraulic motor.

A hydraulic circuit that enables smooth absorption of the energy of a return fluid from a hydraulic actuator by means of an energy recovery motor. A return fluid passage to which the fluid discharged from a boom cylinder is branched is provided at the tank passage side of a solenoid valve of a boom control circuit. The return fluid passage comprises two return passages, which are provided with a flow rate ratio control valve for controlling a ratio of fluid that branches off into the return passages. The flow rate ratio control valve is comprised of a solenoid valve disposed in the return passage, which is provided with an energy recovery motor, and a solenoid valve disposed in the return passage, which branches off the upstream side of the solenoid valve.

A compressed-air energy storage system according to embodiments of the present invention comprises a reversible mechanism to compress and expand air, one or more compressed air storage tanks, a control system, one or more heat exchangers, and, in certain embodiments of the invention, a motor-generator. The reversible air compressor-expander uses mechanical power to compress air (when it is acting as a compressor) and converts the energy stored in compressed air to mechanical power (when it is acting as an expander). In certain embodiments, the compressor-expander comprises one or more stages, each stage consisting of pressure vessel (the “pressure cell”) partially filled with water or other liquid. In some embodiments, the pressure vessel communicates with one or more cylinder devices to exchange air and liquid with the cylinder chamber(s) thereof. Suitable valving allows air to enter and leave the pressure cell and cylinder device, if present, under electronic control.

A compressed-air energy storage system according to embodiments of the present invention comprises a reversible mechanism to compress and expand air, one or more compressed air storage tanks, a control system, one or more heat exchangers, and, in certain embodiments of the invention, a motor-generator. The reversible air compressor-expander uses mechanical power to compress air (when it is acting as a compressor) and converts the energy stored in compressed air to mechanical power (when it is acting as an expander). In certain embodiments, the compressor-expander comprises one or more stages, each stage consisting of pressure vessel (the “pressure cell”) partially filled with water or other liquid. In some embodiments, the pressure vessel communicates with one or more cylinder devices to exchange air and liquid with the cylinder chamber(s) thereof. Suitable valving allows air to enter and leave the pressure cell and cylinder device, if present, under electronic control.

The invention relates to an oil condition on-line monitoring system of hydraulic oil and lubricating oil, and is characterized in that the system consists of an oil condition detection and sensing system, an environment monitoring system, a data collection and conversion system, an operation procedure, a warning (caution) system and an automatic implementing system; a bypass and an oil storage chamber are arranged on an oil station; each monitoring unit is fixed to monitor an oil viscosity, a micro-moisture content, a temperature, impurity, a pressure and other parameters in real time; an actual measured value is compared with the set value; when the actual measured value excesses an allowed range, the system automatically warns or implements the functions of closing, self-locking, etc.

A cylinder driving system capable of reducing the number of hydraulic devices and the amount of energy loss and an energy regenerating method thereof are provided. To this end, the system includes i) a hydraulic cylinder, ii) a hydraulic pump having three suction/discharge ports of a first port for supplying oil to a bottom chamber of the hydraulic cylinder or draining oil from the bottom chamber, a second port for draining oil from a head chamber of the hydraulic cylinder or supplying oil to the head chamber, and a third port for draining oil from a tank or supplying oil to the tank, the suction rate or the discharge rate in the first port being the sum of the respective discharge rates or suction rates in the second port and the third port, and iii) a driving source for driving the hydraulic pump.

A dialysis machine valve manifold assembly includes a plurality of pneumatic valves; a plate including a first side and a second side, the plurality of pneumatic valves mounted to the first side of the plate, the second side of the plate defining a plurality of pneumatic flow paths; and a port header mounted removably to the plate, the port header including a plurality of ports configured to connect sealingly to pneumatic tubing, the ports in fluid communication with the pneumatic valves via the pneumatic flow paths defined in the plate.

First and second hydraulic pumps each adapted to operate plural actuators are activated by separate electric motors respectively. In accordance with signals provided from a controller on the basis of operations of levers, the number of revolutions of the electric motor and that of the electric motor are controlled each independently and simultaneously to control the discharge rates of both hydraulic pumps.

A hydraulic system for a work machine is provided. The hydraulic regeneration system has a tank, a primary source, a first actuator, an accumulator, and a first valve mechanism. The tank is configured to hold a supply of fluid. The primary source is configured to pressurize the fluid and has a suction inlet and a discharge outlet. The first actuator is configured to receive pressurized fluid from the discharge outlet of the primary source. The accumulator is in fluid communication with the tank, the suction inlet of the primary source, and the first actuator. The first valve mechanism is disposed between the suction inlet of the primary source and the accumulator, and is movable between a first position at which fluid returning from the first actuator is directed to the suction inlet of the primary source, and a second position at which fluid returning from the first actuator is directed to only the accumulator.

A hydraulic system is disclosed. The hydraulic system includes an actuator including a first, a second, and a third fluid chamber. The hydraulic system also includes a high pressure source of pressurized fluid in selective fluid communication with the first and second fluid chambers. The hydraulic system also includes a low pressure source of pressurized fluid in selective fluid communication with the first and second fluid chambers. The hydraulic system further includes a hydraulic motor in fluid communication with the third fluid chamber.

The invention discloses a differential energy recovery device and a method for a seawater desalination system. The differential energy recovery device comprises two hydraulic cylinders connected in parallel. A piston divides each hydraulic cylinder into two cavities. The piston is fixedly connected with a piston rod. A low-pressure raw water inlet is connected with two left cavities through liquid inlet valves. The left cavities are connected with a high-pressure raw water outlet through liquid drain valves. Two right cavities are connected with reversing valves. The reversing valves are connected with a high-pressure concentrated water inlet and are connected with a low-pressure concentrated drain outlet. The method is that high-pressure concentrated water coming from a reverse osmosis device is enabled to enter the right cavities of the two hydraulic cylinders through the reversing valves, and low-pressure raw water in the left cavities is pushed and pressurized to enter the reverse osmosis device. Since the direct pressurization principle of the hydraulic cylinders is used for the special design, one-time energy conversion is adopted and the pressure of high-pressure seawater after pressure exchange is larger than the pressure of concentrated saline water, the invention has the advantages that the pressurizing pumps are not required for pressurization once more, the energy conversion efficiency is high, the operating cost is saved and the energy consumption of the reverse osmosis system is further reduced.

A flow rate control device in a hydraulic excavator, comprising a hydraulic pump which is driven rotatively by an engine, a hydraulic actuator which is driven by a hydraulic oil discharged from the hydraulic pump, a control valve which controls the supply of the hydraulic oil to the hydraulic actuator, an operating means which operates the control valve so as to change over the valve from one position to another, a relief valve disposed in a discharge oil path extending from the hydraulic pump to limit the maximum pressure in the discharge oil path, an operational condition detecting means for detecting an operational condition of the hydraulic actuator, a pump pressure detecting means for detecting the discharge pressure of the hydraulic oil discharged from the hydraulic pump, a flow rate adjusting means for adjusting the discharge flow rate of the hydraulic oil discharged from the hydraulic pump, and a control means to which are inputted detection signals from both the operational condition detecting means and the pump pressure detecting means. When a specific operational condition of the hydraulic actuator is detected and when the said discharge pressure is held at a predetermined relief cut-off pressure or higher for a predetermined period of time, the control means makes control so that the discharge flow rate of the hydraulic oil discharged from the hydraulic pump is decreased to a relief cut-off pressure by the flow rate adjusting means. According to this construction, the relief cut-off control can be made only where required for each of various works of different conditions which the hydraulic excavator performs, such as excavating work, crushing work and land readjusting work. That is, even when the discharge pressure is held at a predetermined relief cut-off pressure or higher for a predetermined period of time, the relief cut-off control is made if the hydraulic actuator is in the specific operational condition.