98 results about "Liquid piston" patented technology

Height adjustable seat posts for bicycles are described herein. An example height adjustable seat post includes an upper tube and a lower tube configured in a telescopic arrangement. The height adjustable seat post also includes a shaft coupled to the lower tube and extending into the upper tube a piston assembly coupled to the shaft and disposed in the upper tube. The piston assembly includes a piston dividing the upper tube into a first chamber and a second chamber. The first and second chambers are filled with fluid. The piston assembly includes a valve operable between a closed state in which the fluid is blocked from flowing between the first and second chambers and an open state to enable the fluid to flow between the first and second chambers. The height adjustable seat post also includes a solenoid to control the valve.

The liquid piston compressor comprises a compression assembly, the compression assembly comprises a first compression tank, a second compression tank, a third compression tank and a plunger pump, a liquid inlet of the plunger pump communicates with a compressed liquid pool, a first electromagnetic valve is arranged between the plunger pump and the first compression tank, and a second electromagnetic valve is arranged between the plunger pump and the second compression tank; a first one-way valve is arranged between the first compression tank and the low-pressure air source, a second one-way valve is arranged between the second compression tank and the low-pressure air source, a third one-way valve is arranged between the third compression tank and the low-pressure air source, and a fourth one-way valve is arranged between the first compression tank and the high-pressure tank. A fifth one-way valve is arranged between the second compression tank and the high-pressure tank, a sixth one-way valve is arranged between the third compression tank and the high-pressure tank, and the high-pressure tank is communicated with a heat exchange mechanism. Liquid is always located below, gas is located above, the compression tank is easily filled with the liquid, and the efficiency is higher than that of a traditional compressor.

The utility model discloses a liquid detection device of a pipette. The liquid detection device comprises a pipette tip, a piston air pump, a pressure air pump, an air pressure sensor and a controller, the pipetting tip comprises an inlet end and an outlet end which are oppositely arranged, and the outlet end is used for being in contact with liquid; the piston air pump is communicated with the pipetting suction head and is used for generating air pressure for sucking liquid into the pipetting suction head or discharging the liquid out of the pipetting suction head; the pressure air pump is communicated with the pipetting suction head and is used for generating gas pressure with adjustable duration in the pipetting suction head; the air pressure sensor is connected in an air path formed by the pipetting suction head and the pressure air pump and is used for detecting the air pressure in the air path; and the controller is electrically connected with the air pressure sensor and is used for judging whether the pipetting suction head is in contact with liquid or not according to a detection signal of the air pressure sensor. The pressure air pump is additionally arranged, the pressure air pump can generate gas pressure with adjustable duration, airflow can be generated for a long time, the limitation that a piston air pump is limited by the stroke during liquid detection is broken through, and the liquid detection requirements of different heights of reagent liquid levels can be met.

A toe valve system positioned along a tubing string. The toe valve system a piston sleeve slidably disposed in an outer housing which has ports therethrough. The toe valve system comprises a shifting sleeve shiftable between positions with respect to the ports. A piston sleeve initially held in a position closing off the at least one port to prevent flow between the interior and exterior of the tubing string. A compensator sleeve mounted within the outer housing, wherein the compensator sleeve is free floating and can accommodate changes in tubing pressure. A piston chamber filled with a liquid which is located between the piston sleeve, the compensator sleeve and the outer housing. The liquid in the piston chamber is retained by a rupture disk that can release the liquid when sufficient pressure is applied within the toe valve system causing the piston sleeve to move and opening the ports.

The invention discloses a liquid piston and water foam compounded multi-stage isothermal compression device and method, the device mainly comprises a low-pressure compression cavity and a high-pressure compression cavity, the liquid piston is utilized to realize preliminary compression of gas, and the water foam is introduced in the multi-stage compression process to enhance heat exchange. Gas compressed by the low-pressure compression cavity is introduced into a liquid working medium at the bottom of the high-pressure compression cavity, water foam is spontaneously generated, compression heat is efficiently absorbed through the large specific surface area of the foam, and the nearly isothermal compression process is achieved. According to the device, single-stage power loss is reduced through multi-stage compression, the throttling valve is used for regulating and controlling the gas inlet rate so as to control foam generation, a liquid working medium is recycled through the gas-liquid separation mechanism, and therefore the system energy efficiency and the output gas purity are improved. Different from an existing mode of generating foam by depending on an additional power mechanism, the device can form foam by directly blowing the low-pressure compressed gas into the liquid without additional energy consumption, so that the efficiency and the economical efficiency of the compressed air energy storage system can be remarkably improved.

A refrigeration system includes a pressure exchanger (PX). The PX is a rotary liquid piston compressor. The PX includes: a first PX inlet fluidly coupled to a heat exchanger outlet of a heat exchanger comprising a gas cooler or condenser; a first PX outlet fluidly coupled to a heat exchanger inlet of the heat exchanger; a second PX inlet fluidly coupled to an evaporator outlet of an evaporator; and a second PX outlet fluidly coupled to an evaporator inlet of the evaporator.

A multi-stage radially rotating cylinder liquid piston reciprocating compressor relates to the field of compressor design and manufacturing, comprising a compressor housing, a compression assembly, a control assembly, a cooling circulation system, a gas-liquid processing device, a purging device and a safety protection device; the inner cylinder body of the compression assembly is arranged in an outer cylinder body, a transmission shaft is fixed in the center hole of the inner cylinder body, and the center of the inner cylinder body is concentrically arranged with the geometric center of the outer cylinder body; a plurality of mounting holes are evenly distributed radially and radially along the outer edge surface of the inner cylinder body, and the mounting holes are arranged from the inside to the outside in sequence. The choke plug is connected to the outer cylinder body and a retainer on the side wall thereof through the bearing, and conducting holes are opened in the cylinder chamber along the axis direction of the inner cylinder body, and the conducting holes are connected to the control assembly; through the control and regulation of the control assembly, a single compressor can realize a multi-stage series or multi-cylinder parallel compression process, thereby realizing multi-stage and multiple compressions.

SLOW-ACTUATING MECHANICAL-LIQUID PISTON HEAT PUMP The slow-acting mechanical-liquid piston heat pump (1) comprises a blind liquid cylinder (8) in which translates a double-acting hydraulic piston (10) which is integral with a connecting rod (11) connected to connecting rod actuating means (144), said piston (10) forming with said cylinder (8) a compressor hydraulic variable volume (12) which communicates with a compressor gas and liquid reservoir (14) in which heat exchange and accumulation means (16) are housed to form a compressor (3), and an expander hydraulic variable volume (134) which communicates with an expander gas and liquid reservoir (137) in which expander heat exchange and accumulation means (139) are housed to form an expander (4). Figure for the abstract: Fig. 6

A slow expansion compressor (1) of the mechanical liquid piston type comprises a liquid cylinder (8) which pivots about a tilt axis (9) and in which a hydraulic piston (10) is translated, which hydraulic piston is firmly fixed to a connecting rod (11) of a crank (26) connected to a crankshaft (24), the axis of rotation of which is parallel to the tilt axis (9), and a piston guide member (23) maintaining the connecting rod (11) and the hydraulic piston (10) always parallel to the hydraulic cylinder (8), both forming a variable hydraulic volume (12) filled with the working liquid (13), communicating with a gas and liquid reservoir (14) in which the heat exchange and accumulation member (16) is housed, the reservoir (14) and the liquid (13) form a variable pneumatic volume (2) in which the working gas (5) is compressed or expanded.

According to the piston rotation duration measuring and calculating device for the liquid piston type pressure gauge, the piston to be measured is installed through the installation base on the inspection bench, the piston can rotate on the installation base, images are collected in real time through the high-speed camera assembly above the piston in the piston rotation process, and the piston rotation duration measuring and calculating device is used for measuring and calculating the piston rotation duration of the liquid piston type pressure gauge. The camera is used for collecting images of the piston to be measured and transmitting the collected images to the industrial control host assembly, and the industrial control host assembly is used for analyzing the obtained images, so that measurement and calculation of the rotation duration of the piston are completed, and data of the rotation duration of the piston to be measured are obtained. According to the utility model, image detection is used for measuring and calculating the rotation duration of the piston, and the obtained images are identified frame by frame, so that the measurement result of the rotation duration of the piston is obtained; the technical problems that in the prior art, the rotation duration of the piston of the liquid piston type pressure gauge is measured and calculated through a manual meter clamping mode or a photoelectric sensor and a coded disc mode, errors are large, and use is inconvenient are solved.

The utility model discloses an efficient waste liquid purification system for processing, which relates to the technical field of electrophoresis waste liquid purification treatment and comprises a pump liquid piston inserted into a driving seat. The mixing assembly can be driven by the driving motor to mix waste water and liquid medicine in the treatment barrel for use, meanwhile, the liquid pumping assembly can pump the agent in the liquid storage barrel into the treatment barrel in the stirring and mixing process, the agent can be pumped into different depths of the waste liquid in the treatment barrel in a layered mode, and the treatment efficiency is improved. The flocculation reaction device can be fully mixed, stirred and flocculated with waste liquids at different depths, is high in mixing efficiency and mixing uniformity, and solves the problems that when a flocculation reaction device used in the existing electrophoresis waste liquid purification treatment is used, a flocculation agent and to-be-treated waste water enter a treatment barrel in batches, so that the flocculation agent and the to-be-treated waste water are layered, and the flocculation effect is poor. The mixing efficiency is slow and the mixing uniformity is poor during subsequent stirring and mixing.

The present invention relates to the technical field of pipetting workstations, and discloses a micro-automated pipetting workstation, comprising a pipetting assembly, a workbench, and a tray member, wherein the workbench is used to carry the tray member or drive the tray member to move, the tray member is used to place a feed tray, a mother tray, and a daughter tray, the feed tray is used to place a pipette, and the mother tray and the daughter tray are respectively used to receive liquid; the pipetting assembly comprises a transfer structure, a tube plate, and a lifting structure, the transfer structure is used to drive the tube plate to move, the tube plate is used to take a plurality of pipettes, the pipette comprises a tube body and a piston needle, the lifting structure is used to drive the piston needle to move relative to the tube body, the piston needle is used to absorb or distribute liquid, the lower end of the piston needle forms a lower needle portion, and when distributing liquid, the lower needle portion moves to the outside of the tube body for arrangement. The volume of the pipetting workstation is greatly reduced, and at the same time, the absorption and distribution of trace liquids are achieved, meeting the needs of micro-pipetting, and reducing liquid residue, thereby greatly ensuring the accuracy of the data used in micro-experiments.

The invention discloses a two-stage push rod assembly based on a built-in spring and a foam pump distributor thereof. Comprising a push rod body, a connecting piece, an elastic reset piece and a transmission rod. The foam pump distributor further comprises a main body, a thread outer sleeve, a pump head, a gas pumping piston, a liquid pumping piston and the secondary push rod assembly. A pump head is pressed to drive an air pumping piston and a liquid pumping piston to be pushed downwards, the cooperative work of pumping and pushing is synchronously completed in the pressing stroke, and liquid and air are quantitatively conveyed to a mixing cavity through a flow divider to be foamed and sprayed out; meanwhile, the pump liquid piston abuts against and pushes the push rod body to press the push rod body downwards to a preset extending stroke position; on the premise that the overall size of the distributor is not increased, the foam pumping function and the push rod stretching-out function are highly integrated in single-time pressing operation, the structure is compact, the action is reliable, and the function integration degree and the user experience of a product are remarkably improved.

GROUPED MECHANO-LIQUID PISTON HEAT PUMP The grouped mechano-liquid piston heat pump (1) comprises a blind liquid cylinder of compressors (8) in which a double-acting hydraulic piston of compressors (10) moves to form a first and second hydraulic variable volume of compressor (12, 134), and a blind liquid cylinder of expansion valves (30) in which a double-acting hydraulic piston of expansion valves (39) moves to form a first and second hydraulic variable volume of expansion valve (44, 46), said hydraulic variable volumes (12, 134, 44, 46) communicating with compressor and expansion valve gas and liquid reservoirs (14, 29, 50, 55) in which are housed compressor and expansion valve heat exchange and accumulation means (16, 59, 139, 70), this to form a compressor (3) and a regulator (4). Figure for the abbreviation: Fig. 4

The application provides a kind of liquid piston compressor segmented speed trajectory optimization control method and system, it is related to liquid piston compressor control technical field, obtains initial gas state, target termination volume, target pressure ratio and total compression time, according to initial gas volume, target termination volume and liquid piston equivalent action area determine total stroke and reference average speed;Compression process is divided into multiple speed control sections, non-dimensional speed and time coefficient are used for segmented speed trajectory parameterization, to generate candidate trajectory;Candidate trajectory is subjected to termination displacement constraint check and normalization repair;With peak temperature and maximum pressure change rate as evaluation index, under the constraint of maximum speed, maximum acceleration and termination pressure ratio allowable deviation, fitness function is constructed and speed parameter is optimized;According to the optimization result, speed command or displacement command is generated;Under the premise of meeting the ability of actuator and termination pressure ratio deviation requirement, effectively reduce the peak temperature and pressure change rate of compression process.

A liquid delivery system includes a source of hydraulic fluid and a hydraulic cylinder fluidically coupled to the source of hydraulic fluid and having a hydraulic piston movable between first and second limit positions. The liquid deliver system includes a rod connected to the piston and extending out of the hydraulic cylinder and a sensor device located outside the hydraulic cylinder and configured to sense a position of the rod and to generate a signal indicating the sensed position. The liquid delivery system includes a liquid cylinder comprising a liquid piston, operably driven by the rod, to pump a liquid along a flow path to a fluid applicator.

The paper presents an invention regarding a SPM smart power module, intended for the creation of distributed, safe and efficient energy networks. An elementary module is composed of an innovative Carnot Battery, with high power density, consisting of a heat engine / heat pump whose working agent (gas or vapor) goes through a Carnot / Ericsson / Stirling cycle and which transfers thermal energy between two accumulators with different temperatures. In supply mode, the cycle is run in the direct direction and supplies mechanical / electrical energy, and in charging mode, the heat pump receives energy from the outside (from the network or from renewable sources), and the cycle is run in the opposite direction, transferring thermal energy from the cold reservoir to the hot reservoir. The maximum efficiency of the battery is ensured by at least two isothermalizers, similar to the one described in PCT / R02023 / 050009. Through a system of tanks, heat exchangers, circulation pumps, solenoid valves and pipes, the elementary module can receive a series of extensions, both on the thermal energy capture and distribution side. An intelligent processor collects signals from the SPM system, from a dispatcher, from the Internet, etc, processes them, then sends commands to the motors that actuate the solid pistons of the isothermalizers, the flow regulators of the liquid pistons and of the cooling systems, the solenoid valves, the circulation pumps, in such a way as to ensure the maximum exergetic and economic efficiency of the module, the flattening of load peaks, the maximum safety, the maximum utilization coefficient of all components. Any energy production unit and any consumer can be included in a smart module that ensures the storage, then the supply of the entire energy offers, ensuring consumers a safe, uninterrupted supply.

The application relates to a damping buffer device for connecting large floating bodies, which comprises a shell, even liquid dampers are arranged on both sides of the shell, the liquid dampers on the same side are symmetrically arranged in pairs with respect to the shell, piston shafts connected with the floating bodies are arranged on the liquid dampers, the liquid dampers comprise cylinder bodies, piston plates in sliding connection with the inner walls of the cylinder bodies are arranged in the cylinder bodies, the lower side regions of the piston plates are in communication with the interiors of the shells and are filled with buffer damping liquid, the upper side surfaces of the piston plates are fixedly connected with the piston shafts, the upper ends of the cylinder bodies are closed structures and form branch buffer cavities with the piston plates, the branch buffer cavities are filled with buffer damping liquid, the branch buffer cavities on the two liquid dampers symmetrically arranged with respect to the shell are communicated with each other through connecting pipes, the application has simple structure and low manufacturing cost, can realize flexible liquid buffering of different dimensions and different angles of the floating bodies connected on both sides, and can avoid the breakage or damage of the floating bodies caused by rigid contact.

The utility model belongs to the technical field of spray covers, and mainly relates to a spray cover and an aerosol can, the spray cover comprises a pressing block movably assembled on a can body, the pressing block is provided with an insertion pipe and a nozzle which are communicated with each other, and the outer side of the insertion pipe is sleeved with a slow release assembly; the slow release assembly comprises a piston and a cavity with a sealed cavity, the piston and the cavity are connected to the outer side of the insertion pipe in a sleeving mode, and the piston is fixedly connected with the pressing block through a sleeve connected to the insertion pipe in a sleeving mode. The cavity is used for being filled with liquid with viscous resistance, the piston divides the cavity into a first cavity and a second cavity which are communicated with each other, and the pressing block is moved to drive the piston to slide in the cavity so that the liquid can flow between the first cavity and the second cavity; the insertion pipe is sleeved with a spring, and the two ends of the spring are connected with the pressing block and the cavity respectively. The reset speed of the pressing block is delayed through the synergistic effect of the viscous resistance of the slow release assembly and the elastic force of the spring, and therefore the valve rod can still be kept in the open state temporarily after pressing is stopped, and continuous release of spray is achieved.

The slow-actuation mechanical liquid piston heat pump (1) with a blind liquid cylinder (8) in which a double-acting hydraulic piston (10) translates which is secured to a connecting rod (11) connected to connecting rod actuating means (144), a piston (10) forming with a cylinder (8) a compressor hydraulic variable volume (12) which communicates with a compressor gas and liquid reservoir (14) in which are housed heat exchange and accumulation means (16) to form a compressor (3), and a expander hydraulic variable volume (134) which communicates with a expander gas and liquid reservoir (137) in which are housed expander heat exchange and accumulation means (139) to form an expander (4).

The present invention belongs to the technical field of shale reservoir development, and specifically relates to a shale reservoir fracturing flowback simulation system and method and a flowback efficiency evaluation method. The system of the present invention includes a core holder, and the core holder is connected to a confining pressure pump, an axial pressure pump, a gas piston container, a liquid piston container, a flowback simulation control and measurement system and a back pressure system; and also includes a CT scanning device. The shale reservoir fracturing flowback simulation method includes core preparation, core evacuation and saturation, core fracturing, well blocking simulation, and flowback simulation. The shale reservoir fracturing flowback efficiency evaluation method includes: recording the total amount of liquid injected from fracturing to well blocking stage; measuring the amount of fracture fluid and the amount of output fluid at different times in the flowback stage; calculating the change in matrix liquid volume by subtracting the change in fracture liquid volume from the output liquid volume; and calculating the total flowback rate, the flowback rate of fracturing fluid in the matrix, and the flowback rate of fracturing fluid in the fracture respectively. The present invention provides a shale reservoir fracturing flowback simulation system and method and a flowback efficiency evaluation method.

Disclosed is a forced external circulation compression or expansion device intended for pseudo-isothermal transformations. The invention relates to a device that reduces the increases or decreases in temperature of the fluids (3) during these thermodynamic transformations. It consists of a fluid-tight cylinder (1), a mobile piston (2), of elongate shape free of rotational symmetries, performing the compression or expansion, a gaseous or supercritical fluid (3) undergoing this transformation, and two orifices, namely one (11) for discharging and one (10) for admitting the fluid (3). Outside the cylinder (1), the device includes a heat exchanger (4), pipes (6) and a fan (5). In the case of liquid piston, a pump or a hydraulic expander (8) ensures the displacement of the hydraulic liquid (9) via a hydraulic orifice (14). The device may include mobile, fluid-impermeable physical partitions (4), and external thermal reserves (7). The device improves the thermodynamic performance of compressors, heat pumps, ORCs, energy storage and liquefaction units.

SLOW-MOUNTING MECHANICAL-LIQUID PISTON COMPRESSOR-EXPENSOR The slow-moving mechanical-liquid piston compressor-expander (1) comprises a liquid cylinder (8) that pivots about a tilting axis (9) and in which a hydraulic piston (10) translates. The piston is fixedly attached to a connecting rod (11) connected to a crank (26) of a crankshaft (24) whose axis of rotation is parallel to the tilting axis (9). Piston guiding means (23) maintain the connecting rod (11) and the hydraulic piston (10) always parallel to the liquid cylinder (8). These two form a variable hydraulic volume (12) filled with a working fluid (13) that communicates with a gas and liquid reservoir (14) in which heat exchange and accumulation means (16) are housed. The reservoir (14) and the fluid (13) form a variable pneumatic volume (2) in which is compressed or expanded a working gas (5). Figure for the abbreviation: Fig. 1

A reciprocating pump for pressurizing a cryogenic liquid includes a pump housing, a suction chamber, a discharge chamber and a piston rod and a piston. The pump housing has a suction part into which a target liquid flows. The suction chamber is disposed in the pump housing, has an inner space divided into an upper space and a lower space, and is configured to inhale the target liquid then to pressurize the inhaled target liquid primarily. The discharge chamber is disposed under the suction chamber, has an inner space formed to be connected with the upper space of the suction chamber, and is configured to receive the pressurized target liquid in the suction chamber, to pressurized the received target liquid secondarily and then to discharge the pressurized target liquid. The piston rod and the piston are configured to the target liquid in the suction chamber and the discharge chamber.

The invention relates to a device for isothermal expansion and compression of a gas (3), which ensures the compression of the gas by consuming mechanical energy and the recovery of the mechanical energy by the expansion of the gas. The device comprises at least two liquid pistons (4, 41, 42) movable in at least two chambers (31, 32) each comprising a gas that can be compressed or expanded by the movement of said liquid pistons. Comprising at least one solid piston ensures the movement of the liquid piston in the chamber. Each chamber comprises an insert (51, 52) through which the liquid (4) and the gas can circulate, the insert comprising a through-unit (53) extending in a direction parallel to the direction of movement of the liquid piston in the insert. The apparatus comprises at least one first phase separator connected to the outlet of each of the chambers and to a tank (5) for storing pressurized gas.

This invention discloses a four-stage series double-acting liquid piston Stirling refrigeration and heating device, relating to the field of Stirling refrigeration technology. It includes an outdoor unit and an indoor unit. The indoor unit includes a first refrigeration unit and a second refrigeration unit, while the outdoor unit includes an engine first and an engine second. Engine first is connected to a first solar collector, and engine second is connected to a second solar collector. This invention employs the aforementioned four-stage series double-acting liquid piston Stirling refrigeration and heating device. By replacing the traditional mechanical piston with a liquid piston, it solves the inherent problems of traditional Stirling refrigeration machines, such as working fluid leakage and difficult maintenance. This improves the stability and reliability of the refrigeration system, significantly extending its service life. The four-stage series mechanism enables cascaded energy utilization, reducing energy consumption. It allows for switching between refrigeration and heating modes, has a simple structure, is economical and environmentally friendly, and can greatly meet the needs of daily life.

A pump dispenser includes an air cylinder, an air piston provided in the air cylinder to reciprocate, a liquid cylinder, a liquid piston provided in the liquid cylinder to reciprocate, a mixing chamber having a communication hole in an upper wall thereof and provided on the secondary side of the air piston and the liquid piston to mix a liquid material and air supplied by reciprocation of the air piston and the liquid piston, a porous body provided on the secondary side of the mixing chamber, and a nozzle including a flow path formed on the secondary side of the porous body and a discharge hole whose opening area is smaller than an opening area of the flow path to reciprocate thereby to cause the air piston and the liquid piston to reciprocate.

The mechanical liquid piston slow expansion compressor (1) comprises a liquid cylinder (8) which pivots about a tilt axis (9) and into which a hydraulic piston (10) translates, which is fixedly secured to a connecting rod (11) connected to a crank (26) of a crankshaft (24), the axis of rotation of which is parallel to the tilt axis (9), while piston guiding means (23) maintain the connecting rod (11) and the hydraulic piston (10) always parallel to the liquid cylinder (8), these two latter forming a variable hydraulic volume (12) filled with a working liquid (13) which communicates with a gas and liquid reservoir (14) in which heat exchange and accumulation means (16) are housed, said reservoir (14) and said liquid (13) forming a variable pneumatic volume (2) in which a working gas (5) is compressed or expanded.

The invention belongs to the technical field of energy storage, and discloses a high-pressure compressed air energy storage system and method based on a double-tank liquid piston system.The system comprises two pressure tanks, a water pump, a control valve set, a compressed air inlet system, a high-pressure air outlet system and a heat energy management system, a heat insulation air bag is arranged in at least one pressure tank, air which is pre-compressed to original energy storage pressure is guided into the heat insulation air bag through a compressed air inlet system, air which is compressed to the highest safety pressure of a salt cavern is transferred to the salt cavern to be stored through a high-pressure air outlet system, and heat generated in the compression process is recycled through a heat energy management system. According to the method, high-pressure compressed air energy storage is achieved through the system, and two compression processes are included. Compressed air can be further compressed to the highest safety pressure of the salt cavern from the conventional energy storage pressure, so that the capacity and efficiency of an energy storage system are improved, and the unit energy storage cost is reduced.

The present invention discloses a high-flow-rate liquid piston system, which includes a power grid connected to a water pump, a generator connected to a water turbine, a hydraulic cylinder, and a reversible power device. The piston rod of each hydraulic cylinder is connected to a reversible power device. A water pool is connected to the hydraulic cylinder through a main pipeline. The input and output of the reversible drive device are connected to an external power grid. During operation, by controlling the working water flow rate of the water turbine to slow down and the working water flow rate of the water pump to speed up, kinetic energy recovery is achieved. A steady-flow control strategy is used to issue motion instructions to each reversible power device, enabling them to operate in a time-interleaved manner. The start-stop and commutation times of the hydraulic cylinders are staggered with each other, ensuring that the liquids flowing out of the parallel hydraulic cylinders compensate each other, and realizing the stable flow rate of the main pipeline on the water pool side at the target flow rate, thus forming a piston system with a stable flow rate, high flow rate, and recoverable kinetic energy.