271 results about "Hydraulic accumulator" patented technology

A hydraulic arrangement (14, 214) for a work machine (1) comprising: a body (2) and a hydraulically actuated work implement (6); said hydraulic arrangement (14) comprises: pumping means (17) to suck hydraulic fluid from a tank (18) and to provide at outlet a pressurized flow of hydraulic fluid; one actuator (7) to operate the hydraulically actuated work implement (6); a hydraulic circuit (20) to put the source of hydraulic fluid (17) in communication with the hydraulic actuator (7); and a control valve arrangement (22) to selectively put the hydraulic circuit (20) in fluid communication with the hydraulic actuator (7); the hydraulic circuit (20) comprises: a first hydraulic line (21a) connecting the pumping means (17) with the actuator (7); a second hydraulic line (21c) connecting the tank (18) with the actuator (7); one hydraulic accumulator (26, 28) fluidly connected to the first hydraulic line (21a); the hydraulic accumulator (26, 28) comprises a first chamber (31a) connected to the first hydraulic line (21a) and a second preload chamber (31b), opposite to the first chamber (31a), connected to pumping means (17).

A hydraulic system for a passenger restraint device includes a hydraulic pump and a hydraulic section. The hydraulic section includes a hydraulic accumulator, a valve arrangement and a hydraulic cylinder unit with a piston. The valve arrangement is connected to the hydraulic pump, the hydraulic accumulator and the hydraulic cylinder unit. The piston can be moved between an open position and a first closed position. The hydraulic pump can pressurize the hydraulic cylinder unit so that the piston moves from the first closed position to the open position. The hydraulic accumulator is configured so that the piston moves from the open position to the first closed position. The hydraulic cylinder unit can be pressurized in a first switching position of the valve arrangement with a first pressure stage and in a second switching position of the valve arrangement with a second pressure stage lower than the first pressure stage.

The disclosure relates to an hydraulic accumulator, in particular a diaphragm accumulator, having an accumulator housing and a separating element disposed therein, which separates two media spaces from each other, wherein a weld seam is formed by a laser or electron beam welding process without any filler materials, in that at least a part of the wall parts delimiting the transition point are melted to form the weld seam, which closes off the transition point towards the surroundings, in a manner that is free of protrusions with respect to an outer circumferential surface of a connection element.

A method is provided for determining a gas charge pressure PcalcGC of a hydraulic accumulator within a hydraulic fluid system. The method includes receiving pressure decay data representing the pressure decay within a self-pressurizing hydraulic reservoir of the hydraulic fluid system as the self-pressurizing hydraulic reservoir depressurizes from an operating pressure of the self-pressurizing hydraulic reservoir towards atmospheric pressure. The method also includes calculating the gas charge pressure PcalcGC of the hydraulic accumulator using the received pressure decay data of the self-pressurizing hydraulic reservoir.

A damping arrangement of an active chassis for an axle of a motor vehicle. A damping system cooperates with each wheel of the axle, wherein each of the damping systems includes a damper, a hydraulic pump, and an electric motor. A hydraulic unit includes a hydraulic reservoir and valves, wherein the hydraulic pump and the hydraulic unit of the respective damping system cooperate with hydraulic chambers of the hydraulic cylinder of the respective damping system, such that, depending on the conveying direction of the hydraulic pump of the hydraulic unit, a movement of the piston in a first actuation direction or in a second actuation direction can be provided. The hydraulic pumps and the electric motors of both damping systems are combined to form a motor-pump unit. The motor-pump unit is fastened on both sides thereof to an axle carrier of the axle via two bearings.

The utility model relates to a buffer device of an actuating mechanism. The buffer device comprises a pneumatic actuator, a buffer block, an energy accumulator, a buffer shell, a buffer piston and a buffer spring, the pneumatic actuator comprises an actuator shell, an actuator upper cover, an actuator piston and an actuator push rod; the actuator piston can axially slide along the inner wall of the actuator shell; a plurality of actuator guide shafts are arranged between the actuator upper cover and the actuator piston; the actuator piston is fixedly connected with the actuator push rod; the buffer block is fixed to the lower end of the actuator shell, and a closed air storage space is formed between the buffer block and the actuator piston. The buffer block is provided with an exhaust port which can be controlled to be opened and closed; the actuator push rod penetrates through the buffer block and is in sliding fit with the buffer block; the buffer shell limits the maximum stroke of downward movement of the actuator piston. The buffer piston is annular and is arranged between the actuator push rod and the buffer shell in a sleeved mode, the upper portion of the buffer piston abuts against the actuator piston, the lower portion of the buffer piston is communicated with an oil discharge channel embedded in the buffer block, and the oil discharge channel is communicated with the hydraulic energy accumulator.

An additional hydraulic device for a pitch system of a wind turbine, the additional hydraulic device including a hydraulic motor, a hydraulic accumulator for storing hydraulic energy, a valve unit, a return line and a reservoir. The return line is connected to the reservoir. The valve unit is switchable to a drive switching position, and the hydraulic motor is connected to the hydraulic accumulator in the drive switching position. The energy stored in the hydraulic accumulator drives the hydraulic motor in the drive switching position so that the hydraulic motor delivers an additional force component.

The invention discloses an air compressor energy-saving system based on hydraulic energy recovery and an operation method of the air compressor energy-saving system, and relates to the technical field of air compressor energy saving. According to the system, under the unloading or low-load state of the air compressor, residual mechanical energy is converted into hydraulic energy through the hydraulic pump in linkage with the air compressor, and the hydraulic energy is stored in the hydraulic energy accumulator. And when the system load rises or the air compressor needs to be quickly started, the stored hydraulic energy is released through the hydraulic motor, and the air compressor is assisted to be accelerated to a rated state. The system adopts closed-loop PID control, feedforward control and a self-adaptive adjustment algorithm, ensures that the energy recovery and release process is stable and efficient, has a multi-stage safety protection function, and achieves the purposes of saving energy, reducing consumption, shortening starting response and prolonging the service life of equipment.

The utility model relates to a wind power generation system for marine ship navigation, which comprises a vertical fan, a constant-pressure oil pump, an oil storage tank, a hydraulic distributor, a hydraulic motor, a generator and a hydraulic accumulator, a blade shaft of the vertical fan is provided with a rotating speed sensor and connected with the constant-pressure oil pump, and the rotating speed sensor is connected with the generator. The constant-pressure oil pump is connected with an oil storage tank, the oil storage tank is provided with a hydraulic distributor, the hydraulic distributor is connected with a plurality of generator sets, and electric energy generated by each generator set is merged into the ship micro-grid combined cabinet. According to the utility model, liquid energy with rated pressure is respectively output to each generator set through the liquid energy distributor, 380V and 220V alternating current and 48V direct current can be obtained, each path of liquid energy has rated liquid energy for the generator set with hydraulic power to stably generate electricity, the generated electric energy is combined and input into a ship-ship micro-grid, the wind energy is comprehensively absorbed, and the conversion rate of the wind energy reaches more than 60%.

The invention relates to the field of energy accumulators, and discloses a hydraulic energy accumulator fastening and sealing structure which comprises a shell, a cylinder cover is arranged at the top of the shell, a gas conveying pipe is fixedly connected to the middle of the cylinder cover, an oil conveying pipe is fixedly connected to the bottom of the shell, a piston is installed in the shell, and a first annular groove is formed in the middle of the piston; a first annular groove is formed in the piston, a sealing structure is arranged in the first annular groove of the piston, first D-shaped sealing rings are symmetrically arranged on the outer wall of the piston, arc-shaped baffle rings are symmetrically arranged on one sides of the first D-shaped sealing rings, and sliding discs are symmetrically connected to one side of the piston in a sliding mode. The sliding disc slides on the piston, so that the first spring and the second spring are compressed, partial energy storage operation is conducted, the pushing structure is driven to operate, the first D-shaped sealing ring is pushed, the contact stress of the arc-shaped edge of the first D-shaped sealing ring and the inner wall of the shell is increased along with rising of oil pressure, and dynamic sealing compensation is formed.

1. Method 2. The invention relates to a method for producing at least one part of an accumulator housing (10) for a hydraulic accumulator, said method having the following method steps: - providing accumulator housing parts (12, 14) which are to be connected to one another along mutually adjacent end sides (16, 18), of which at least one end side (16) has a material accumulation (20); - moving the adjacent accumulator housing parts (12, 14) together in such a way that the material accumulation (20) comes into contact with the adjacent end side (18); and simultaneously or subsequently - melting the material accumulation (20) by means of a welding process, and further moving the two accumulator housing parts (12, 14) together during the welding process with a predefinable pressing force; and simultaneously - forming a weld seam running along a connecting point (42) between the accumulator housing parts.

A damping system of an active chassis for one wheel of a motor vehicle. The system includes a double-acting hydraulic cylinder and a damper having a piston, which damper is couplable to a wheel suspension system for the wheel. The system also includes a hydraulic pump, and a hydraulic unit having a hydraulic reservoir and valves. The hydraulic pump and the hydraulic unit cooperate with hydraulic chambers of the hydraulic cylinder such that, depending on the direction of conveyance of the hydraulic pump, a movement of the piston in a first direction of actuation or in a second direction of actuation can be provided. The damper includes the hydraulic cylinder and the piston is designed such that, in the region of the damper, a flow of hydraulic oil via the piston or along the piston of the damper is at most 3 L / min.

The hydraulic accumulator comprises an accumulator housing (18), a separation element (10) arranged longitudinally movably therein for separating two medium chambers (12, 14) within the accumulator housing (18), in particular a chamber containing a working gas, such as nitrogen gas, from another chamber containing a liquid, such as hydraulic oil, and a rupture device (66) for reducing an unacceptably high pressure within the accumulator housing (18), the rupture device (66) being arranged within the separation element (10) and, upon rupture, opening a medium communicating connection (84) between the two medium chambers (12, 14) via the separation element (10).

The utility model relates to a fixed die ejection energy storage device for a die-casting machine, which comprises a hydraulic energy accumulator, a fixed die ejection energy storage device, a fixed die ejection energy storage device and a fixed die ejection energy storage device, the oil tank is connected with the hydraulic energy accumulator, the hydraulic energy accumulator is filled with hydraulic oil through the oil tank, the internal pressure of the hydraulic energy accumulator is increased, and energy is stored in the hydraulic energy accumulator; the control valve is used for controlling the pressure release of the hydraulic energy accumulator; hydraulic oil is filled into the hydraulic energy accumulator through the oil tank, so that the internal pressure of the hydraulic energy accumulator is increased, energy is stored in the hydraulic energy accumulator, kinetic energy is consumed when the die-casting machine works, at the moment, the control valve is opened, high-pressure oil stored in the hydraulic energy accumulator is rapidly released, powerful power is provided for movement of a die, products are ejected out, and the ejection efficiency of the die-casting machine is improved.

The invention discloses a loader and a double-pump two-way interchange energy recovery system of a movable arm oil cylinder of the loader, and relates to the technical field of hydraulic drive of loaders. The system comprises a two-position four-way electromagnetic directional valve, a three-position four-way electromagnetic directional valve, a hydraulic energy accumulator, a third two-position two-way electromagnetic directional valve connected to the hydraulic energy accumulator, a first pump motor, a second pump motor, a first motor and a second motor, wherein oil inlets of the first pump motor and the second pump motor are connected to a hydraulic oil tank, and the first motor and the second motor are in transmission connection with the first pump motor and the second pump motor respectively. The hydraulic oil cylinder is provided with a rodless cavity and a rod cavity, and the first two-position two-way electromagnetic directional valve and the second two-position two-way electromagnetic directional valve are connected to the rod cavity and the rodless cavity respectively; and the two-position four-way electromagnetic directional valve is used for communicating oil outlets of the first pump motor and the second pump motor with the first two-position two-way electromagnetic directional valve and the second two-position two-way electromagnetic directional valve respectively. And the three-position four-way electromagnetic directional valve is used for switching and communicating the third two-position two-way electromagnetic directional valve with the rodless cavity, the rod cavity and an oil inlet of the first pump motor.

An ABS device for a hydraulic braking system of a bicycle or motorcycle, in particular for bicycles, comprises an electrically actuated valve unit (13) which is switchable between a first operating state in which a master cylinder (2) associated with a brake lever is in contact with an actuating cylinder (3) of a brake device and a second operating state in which the connection is interrupted and the actuating cylinder (3) of the brake device is in contact with a fluid accumulator (9).An electronic control (E) is designed to control the position of the moving element (11) of the fluid accumulator (9) both during activation of the ABS function and during deactivation of the ABS function in order to effect: a non-abrupt, but progressive, change in the pressure (CP) in the line (8) connected to the actuating cylinder (3) of the brake device (F), as a function of the rotational speed (ω) of the wheel (R1) to which the brake device is assigned, and as a function of a second parameter, which is the pressure (CP) in the actuating cylinder (3) of the brake device or the deceleration of the vehicle, which is detected or calculated from a sensor assigned to the vehicle.

A press (1) for forging metal items, in particular, ingots, comprising - a movable crossbeam (3); - a plurality of hydraulic cylinders (2) adapted to move the movable crossbeam (3); - a first tank (21), adapted to contain oil; - a pumping system (4) adapted to send oil from the first tank (21) to the hydraulic cylinders (2), in particular to pressurize the hydraulic cylinders (2); - an energy recovery system comprising one or more hydraulic accumulators (5) adapted to receive and release oil, in particular pressurized oil, discharged from the hydraulic cylinders (2) during a step of decompressing the hydraulic cylinders (2) in which the oil passes from the forging pressure to a lower pressure; a first valve (7), adapted to control the oil flow from the hydraulic cylinders (2) to said one or more hydraulic accumulators (5).

An aircraft hydraulic braking system having at least one hydraulic accumulator and a brake actuator. The at least one hydraulic accumulator is the sole source of pressurised hydraulic fluid in the aircraft hydraulic braking system for operating the brake actuator and thereby apply a braking force to a wheel on an aircraft.

An agricultural tractor mounting assembly comprising a toolbar engaged with a first implement engaging a soil subsurface and also equipped with a carrying tool for engaging another implement. The carrying tool may include hydraulic cylinders and hydraulic charged accumulators which lift, suspend, and support implements behind a toolbar engaged to a tractor. The implement engaging the soil and the carrier tool may be engaged to the toolbar of the tractor mounting assembly which is engaged to the tractor.

The utility model provides a hydraulic press with balance cylinders, which is characterized in that a plurality of return cylinders and balance cylinders are arranged between a workbench and a slide block component, the number of the balance cylinders is the same as that of the return cylinders, the balance cylinders and the return cylinders are arranged on the workbench diagonally, and the return cylinders are driven by a hydraulic power system. The balance cylinder is driven by a balance cylinder energy accumulator set, and the balance cylinder energy accumulator set is fixedly arranged on one side of the workbench. According to the utility model, the balance cylinder energy accumulator group device is additionally arranged on the hydraulic machine, so that the capacity of the hydraulic energy accumulator group can be effectively reduced, the heating and the energy consumption are greatly reduced, no vibration exists, and the stability and the safety of equipment can be improved; the balance cylinder hydraulic energy accumulator sets are designed in a modularized mode, multiple sets can be used in a matched mode, and meanwhile assembly and equipment maintenance are facilitated.

A method and system for monitoring the performance of a pair of hydraulic accumulators on board an aircraft. The method comprises: collecting (401) pressure values from the accumulators during each of N flights of the aircraft, with N ≥ 2; for each of the N flights, calculating (403) an average pressure value for each accumulator; for each accumulator, calculating (404) an average of the N previously calculated average pressure values; calculating (405) a parameter P which is the absolute value of the difference between the two averages; calculating (408) a leakage indicator which is a function of the difference between the parameter P and a given reference value; and triggering (410) an alert if the indicator is greater than a first predetermined threshold, and not triggering (411) an alert if the indicator is not greater than the first predetermined threshold. This provides reliable monitoring which is easy to implement, so that maintenance alerts can be issued sufficiently in advance.

The utility model relates to the field of hydraulic energy accumulators, and discloses an anti-impact piston type hydraulic energy accumulator which comprises an energy accumulator shell, a front end plate is fixedly connected to the front side of the energy accumulator shell, a first hydraulic oil channel is formed in the middle of the front end plate, and a buffering assembly is arranged on the rear side of the front end plate. Limiting rods are fixedly connected to the left and right sides of the rear side of the inner wall of the energy accumulator shell, piston bodies are slidably connected to the outer sides of the limiting rods, the buffer assembly comprises telescopic columns, springs, a buffer plate and a second hydraulic oil channel, and the telescopic columns are fixedly connected to the left and right sides of the rear part of the front end plate. According to the piston type hydraulic energy accumulator, through cooperation of the telescopic column, the spring, the buffer plate, the second hydraulic oil channel and other structures, the piston type hydraulic energy accumulator can protect impact, the situation that when the internal pressure of the hydraulic cavity drops suddenly, the piston impacts the front end plate, and consequently equipment is damaged is prevented, and the service life of the piston type hydraulic energy accumulator is prolonged.

The application provides an electric loader distributed hydraulic system using an electro-hydraulic composite cylinder. Mainly includes steering drive subsystem, first pumping device, bucket distributed valve group, bucket electro-hydraulic composite cylinder, second sending device, boom distributed valve group, boom electro-hydraulic composite cylinder, whole vehicle controller, control handle, steering wheel, proportional electromagnetic on-off valve and hydraulic accumulator. By decoupling the steering, boom and bucket devices of the traditional loader, independent and efficient driving of each part is realized. The bypass throttling loss is effectively reduced, the overall machine efficiency is greatly improved, each actuator is not disturbed, the system control difficulty is reduced, the response time is shortened, and the control performance is enhanced. The advantages of electric drive and hydraulic drive are effectively combined, and the performance requirements of the overall vehicle economy and power are effectively improved.

The invention relates to a hydraulic accumulator, in particular in the form of a piston accumulator, comprising a separation element (10), which is arranged in an accumulator housing (14) and separates two fluid chambers (16, 18) in a fluid-tight manner, in particular a closed-off storage chamber (20) containing a working gas, from a liquid chamber (22) containing an operating liquid, such as hydraulic oil, a fluid connection (24) being connected in a fluid-conducting manner to one of the fluid chambers (18), characterised in that a magnetic-field-generating device (42) is received in a part of the accumulator housing (14) which comprises the fluid connection (24), in such a way that magnetisable particles can be separated, in a cleaning manner, from the fluid located between the part of the storage housing (14) and the separation element (10) and deposited in the direction of the magnetic-field-generating device (42), on the latter.

The invention relates to a hydraulic system (10) for adjusting a pitch angle of a rotor blade (108) of a wind turbine (100). The hydraulic system (10) comprises a variable pump (12), a hydraulic energy accumulator (14), a dynamic valve (16), a control valve (18), an oil tank (20) and a variable pitch cylinder (22). The invention also relates to a wind turbine having such a hydraulic system (10).

The present invention discloses an active and passive motion compensating trestle luffing system, comprising a servo valve PS, an active oil cylinder, an active and passive oil cylinder, an accumulator and a high-pressure nitrogen bottle group; the active oil cylinder is a single-acting hydraulic cylinder, and its oil chamber is chamber a; the active and passive oil cylinders are double-acting hydraulic cylinders, and its rod chamber is chamber b, and its rodless chamber is chamber c; the accumulator is arranged on the active and passive oil cylinders, and the oil end of the accumulator is connected to the chamber c of the active and passive oil cylinders through an isolation valve group, and the gas end of the accumulator is connected to the high-pressure nitrogen bottle group; the servo valve PS is used to control the active oil cylinder and the active and passive oil cylinders, and the servo valve PS is connected to a hydraulic accumulator group. The present invention also discloses a trestle including the active and passive motion compensating trestle luffing system. The present invention adopts a double hydraulic cylinder instead of a three-chamber composite oil cylinder to solve the defects and shortcomings existing in the prior art.

A method of supporting a trailer using a portable trailer stabilizer, the method comprising: (i) contacting a trailer engagement element of a portable trailer stabilizer with a forward end portion of a parked trailer using a tractor coupled to the portable trailer stabilizer; (ii) compressing a hydraulic cylinder containing pressurized hydraulic fluid and directing the pressurized hydraulic fluid to a hydraulic accumulator via an open isolation valve by pressing the trailer engagement element against the forward end portion of the parked trailer to compress the hydraulic cylinder to move the trailer engagement element from the fully extended configuration to a partially extended configuration by positioning the portable trailer stabilizer at least partially beneath and the forward end portion of the parked trailer using the tractor, the hydraulic cylinder operatively coupled to extend the trailer engagement element relative to a support surface engagement element, the isolation valve fluidically interposing the hydraulic cylinder and the hydraulic accumulator; (iii) extending the hydraulic cylinder while maintaining contact between the trailer engagement element and the forward end portion of the parked trailer by lowering the support surface engagement element to engage a support surface beneath the trailer; and (iv) shutting the isolation valve and securing the trailer engagement element against the forward end portion of the trailer by disengaging the tractor from the portable trailer stabilizer, shutting the isolation valve preventing compression of the hydraulic cylinder, where disengaging the tractor from the portable trailer stabilizer actuates a valve operator mechanism operatively coupled to the isolation valve, the valve operator mechanism being operative to open the isolation valve when the portable trailer stabilizer is coupled to the tractor and to shut the isolation valve when the portable trailer stabilizer is uncoupled from the tractor, and where the hydraulic cylinder, the hydraulic accumulator, and the isolation valve are operatively connected in a closed hydraulic system.

The invention belongs to the technical field of underwater vehicles, and provides an underwater self-powered system of an unmanned underwater vehicle. The hydraulic motor and the generator are in mutual transmission. The first-stage hydraulic transmission structure is provided with a first spring reset type hydraulic oil cylinder, a first piston and a first sealing type oil cylinder barrel, wherein the first piston and the first sealing type oil cylinder barrel are matched in a telescopic mode. The first piston is divided into a first action cavity and a first liquid return cavity, the first action cavity and the first liquid return cavity are communicated through a first pipeline provided with a first one-way valve and connected with a liquid inlet and a liquid outlet of the hydraulic motor respectively, the driving end of the first spring reset type hydraulic oil cylinder pushes the first piston and compresses the first action cavity, and the volume of the first sealing type oil cylinder barrel is larger. In addition, a hydraulic energy accumulator is used for converting seawater pressure into hydraulic energy, an oil outlet of the hydraulic energy accumulator is communicated with an oil cavity of the first spring reset type hydraulic oil cylinder through a first two-position three-way electromagnetic valve, and a port R and an oil inlet are both connected with an oil tank. The system efficiently converts seawater pressure into electric energy, and the endurance performance of the aircraft is greatly improved.

A backup emergency valve drive system for a liquified gas container, having hydraulic accumulators 4 supplying hydraulic fluid to emergency valves 6 of a liquefied gas vessel, and hydraulic pressure i

The invention relates to a hydraulic accumulator, in particular a piston accumulator, in the form of a separation element 10 arranged in an accumulator housing 14 and separating two fluid chambers 16, 18 from one another in a fluid-tight manner, in particular the separation element 10 separating in a fluid-tight manner a closed storage chamber 20 containing a working gas from a liquid chamber 22 containing a hydraulic fluid, such as a hydraulic oil, a fluid connection 24 being fluidly connected to one of the two fluid chambers 18, and a mounting part fixed to the accumulator housing 14 outside the accumulator housing 14, the mounting part having a magnetic field generating device 44 acting on the fluid connection 46 between the fluid connection 24 of the accumulator housing 14 and the fluid connection 25 of the mounting part 26, such that magnetizable particles can be washed away from the fluid passing through the fluid connection 46.