47results about How to "Eliminate throttling losses" patented technology

The invention discloses a digital electric-hydraulic synchronous control system, which comprises a hydraulic actuating mechanism, a digital synchronous control mechanism for performing synchronous control on the hydraulic actuating mechanism, an electric-hydraulic power source for providing power oil for the hydraulic actuating mechanism and the digital synchronous control mechanism, and an electric-hydraulic control system for controlling the power source and the synchronous control mechanism. The hydraulic actuating mechanism is a hydrocylinder; the electric-hydraulic power source comprises an oil storage tank, a double-acting hydraulic oil pump and a driving motor; the electric-hydraulic control system comprises a detector for detecting the oil pressure of the hydraulic oil pump and the rotating speed of the motor respectively and a variable frequency speed regulator and a controller for controlling the motor; and the digital synchronous control mechanism comprises a digital synchronization valve, a digital synchronization controller and a displacement transducer for detecting the displacement of an output shaft of the hydrocylinder. The digital electric-hydraulic synchronous control system has the advantages of simple structure, simple and convenient use and operation, good use effect, energy conservation and no oil leakage, and can achieve the aims of stepless speed regulation and high-precision synchronization according to operating characteristic requirements of different types of controlled objects.

The invention discloses a loader constant and variable hydraulic system based on flow amplifying steering. The loader constant and variable hydraulic system comprises a hydraulic oil tank, a variable pump, a steering gear, a right limiting valve, a left limiting valve, a flow amplifying valve, a left steering cylinder, a right steering cylinder, a flow control valve block, an energy accumulator, a distribution valve, a tipping bucket cylinder, a movable arm cylinder, a pilot valve, an unloading valve block, a constant flow pump, a working mode switching electromagnetic valve and a working mode selector switch. The small-displacement steering gear is adopted to serve as a hydraulic pilot stage of the flow amplifying valve, throttling losses inside a coaxial flow amplifying steering gear in the rapid steering process can be removed, and fuel consumption is reduced; a low-cost home-made element is adopted to replace an inlet element, and steering stability of a variable system is achieved; a feedback signal of the flow amplifying valve is controlled in a time-shared manner, stability of a steering system is improved, and energy consumption is reduced; and meanwhile, the energy-saving effect and good control characteristics of the variable pump can be played out well, and the energy-saving effect and the control precision of a working system are improved.

The invention discloses an active and passive compound control system for a hybrid power hydraulic excavator. According to the active and passive compound control system for the hybrid power hydraulic excavator, a control circuit comprises a hydraulic pump A, a hydraulic pump B, a hydraulic pump C, a movable arm cylinder control valve bank, a bucket rod cylinder control valve bank, a bucket control valve, a rotation control valve, a rotating motor control valve bank, a two-position and two-way valve I, a two-position and two-way valve II, a two-position and two-way valve III, a two-position and two-way valve IV, a two-position and two-way valve V, a two-position and two-way valve VI, a two-position and two-way valve VII, a two-position and three-way valve I, a two-position and three-way valve II, an energy accumulator I and an energy accumulator II, an open type control circuit is adopted to serve as the control circuit, the two cavities of a hydraulic cylinder are each controlled through a power source, and the pressure and the flow of each cavity are regulated independently. The active and passive compound control system for the hybrid power hydraulic excavator has the multiple technical advantages that the energy efficiency is high, the degree of integration is high, power consumption is low, power supply redundancy is avoided, a pilot oil source is not needed, the noise is low, and kinetic energy recovery and potential energy recovery are integrated.

The invention relates to a pump valve coordinated multi-actuator electro-hydraulic control system. The pump valve coordinated multi-actuator electro-hydraulic control system comprises a prime motor, a transfer case, one or more hydraulic cylinders, distributed pump control units and a hydraulic cylinder displacement sensor, a centralized flow power compensation unit is additionally arranged for the distributed pump control units, and the centralized flow power compensation unit comprises a main hydraulic pump, a first overflow valve and an oil tank, a first pressure sensor, a pressure compensator, a control valve set, a bypass proportional valve and an oil supplementing energy accumulator. A valve core displacement sensor is additionally arranged on the pressure compensator. Each distributed pump control unit comprises a two-way variable pump / motor, a first oil supplementing one-way valve, a second oil supplementing one-way valve, a second overflow valve and a third overflow valve. By additionally arranging the centralized flow power compensation unit, the asymmetric flow of all the distributed pump control units is subjected to centralized compensation and power supplementation, various flow compensation auxiliary elements are not needed, a small-power pump control system drives and drags a high-power actuator, and the total installed power of the pump control multi-actuator system is remarkably reduced.

The invention discloses a hydraulic hybrid power excavator hydraulic system with a switching control function, and relates to an excavator hydraulic system, aiming at realizing the excavator hydraulic system and reducing the manufacturing cost. An A port of a second hydraulic transformer is communicated with a rodless cavity oil port of a bucket hydraulic cylinder; a rod cavity oil port of the bucket hydraulic cylinder is communicated with a B port of the second hydraulic transformer; the two oil ports of the bucket hydraulic cylinder are connected in parallel with a first travel constant displacement motor; a loop formed between the bucket hydraulic cylinder and the first travel constant displacement motor is provided with a first switching valve bank; an A port of a third hydraulic transformer is communicated with the rodless cavity oil port of the bucket hydraulic cylinder; the rod cavity oil port of the bucket hydraulic cylinder is communicated with a B port of the third hydraulic transformer; the two oil ports of the bucket hydraulic cylinder are connected in parallel with a second travel constant displacement motor; and a loop formed between the bucket hydraulic cylinder and the second travel constant displacement motor is provided with a second switching valve bank. The switching control over the travel constant displacement motors is realized by using the hydraulic transformers for controlling the bucket and a bucket rod through two valve banks, so that the reconstruction difficulty and cost are reduced.

The invention relates to a hybrid power engineering machine multi-actuator control system which comprises a double-pump double-loop hydraulic control system. A backpressure adjusting unit, a first conversion control valve, a second conversion control valve, a third conversion control valve, a fourth conversion control valve, a fifth conversion control valve, a sixth conversion control valve and a hydraulic control one-way valve set. According to the hybrid power engineering machine multi-actuator control system, a hybrid power system is additionally arranged, recycling of movable arm potential energy and rotation braking kinetic energy is achieved, integrated control over energy recycling and load difference throttling loss eliminating is achieved, shortcomings in the prior art are effectively eliminated, and the beneficial effects of high energy efficiency, low emission and the like are achieved.

The invention discloses a load difference oil-electro-hydraulic composite back pressure regulation double-actuator system. A power regulation unit, a back pressure regulation unit, a controller, conversion control valves, pilot operated check valves and pressure sensors are additionally arranged, an energy recycling structure is adopted, the pressures of oil return cavities of actuators expect a maximum load actuator are controlled to enable the differential pressures of oil inlet cavities of all the actuators and all control valve ports to be equal, thus, the pressure and flow of a hydraulic pump are matched with all the actuators, and throttling losses of multi-actuator systems caused by load differences are eliminated. Defects in the prior art are effectively overcome, and the double-actuator system has the advantages of high energy efficiency, low emission, kinetic energy recycling, power matching integration and the like in many aspects.

The invention discloses a double-hydraulic-cylinder mixed drive control system. A control loop of the system comprises a power element A, a power element B, a hydraulic pump, a power source, a control valve set, a three-position four-way valve, an energy accumulator and a two-position two-way valve. A closed control composite control loop with an independent inlet and an independent outlet is adopted for the control system, mixed drive and energy recycling are achieved for double hydraulic cylinders, and energy is provided for the double hydraulic cylinders while power can be provided for other executing mechanisms. The double-hydraulic-cylinder mixed drive control system has the technical advantages of being high in energy efficiency, small in throttling loss, small in machine installing power, redundant in power source, free of pilot oil source, low in cost and noise, integrated in kinetic potential energy recycling and the like.

The invention discloses an integrated hydraulic transformer, relates to a hydraulic transformer, and aims to solve the problems that throttling losses exist in an existing transformer, and the transformer is small in regulating ratio range and large in noise in the operating process. A left end cover, a shell and a right end cover are sequentially connected from left to right, an outer annular swash plate is rotatably arranged in the left end cover, an inner annular swash plate is arranged on the outer annular swash plate, an outer swash plate adjusting rod penetrates through the left end cover and is connected with the outer annular swash plate, an inner swash plate adjusting rod sequentially penetrates through the left end cover and the outer annular swash plate and then is connected with the inner annular swash plate, a cylinder block and a thrust plate are sequentially arranged in a sealing inner cavity from left to right, a needle bearing is externally arranged on the cylinder block, one ends of a plurality of plungers are matched with plunger holes in the cylinder block, the other ends of the plungers are hinged to piston shoes, and the piston shoes are restrained on the swash plates through inner baffle rings and outer baffle rings. The integrated hydraulic transformer is used for hydraulic transformation.

The invention provides a device and control method for achieving full throttle valve running of an internal combustion engine through hydrogen mixing and particularly relates to a lean combustion, fuel control and full throttle valve combustion technologies. A combustion information feedback device and a combustion electronic control unit are added to a system on the basis of reserving all parts of an internal combustion engine body. The combustion electronic control unit can control a throttle valve to be fully open when the internal combustion engine runs; the actual torque is the same as the target torque through the adjustment of the fuel injection pulse width; through the adjustment of the hydrogen injection pulse width, the cyclical variation of the internal combustion engine is controlled, so that the internal combustion engine can stably run in a fully open mode of the throttle valve under part of load, the throttling loss at the position of the throttle valve is eliminated, and the thermal efficiency of the internal combustion engine is effectively improved.

The invention discloses an electric energy converting-switching system and method applied to a thermal power plant. The frequency and / or voltage of at least one connection end can be adjusted through an electric energy transducer, and electric energy is controlled to flow among plant buses of different frequencies, or the electric energy can be controlled at different frequencies and can be controlled to flow among the plant buses of different frequencies, so that the throttling loss is reduced and even eliminated, the performance of a variable-frequency generating set is brought into full play, and the overall system efficiency is increased, thereby lowering the energy consumption and creating a greater economic benefit; meanwhile, a method of starting and switching through a motor of an auxiliary machine for a plant is improved, so that the flexibility of the overall running manner of the system is improved.

Disclosed is a backpressure and power matching hydraulic hybrid power control double-actuator system. By additionally arranging a power control unit, a backpressure control unit, a controller, a switching control valve, a hydraulic control one-way valve and a pressure sensor, oil return cavity pressure of each actuator except a maximum load actuator is controlled; pressure of an oil inlet cavity of each actuator is the same with differential pressure of a control valve opening, and the fact that pressure flow of a hydraulic pump is matched with that of each hydraulic actuator is achieved; meanwhile, the hydraulic hybrid power function is further extended to the dynamic potential energy recycle, and throttling loss of a multi-actuator system caused by load difference is further eliminated; and the energy-saving effect is greatly improved, the investment recovery cycle is shortened, and application and promotion are facilitated.

The invention discloses a three-freedom-degree lifting device directly driven by hydraulic pumps and belongs to the field of fluid pressure control mechanisms. The three-freedom-degree lifting device comprises a top board, a bottom board and a flow division valve block fixed to the center of the bottom board. An energy accumulator is arranged on the flow division valve block. Three lifting mechanisms of the same structure surround the energy accumulator. The upper ends of the three lifting mechanisms are connected with the top board and the lower ends of the three lifting mechanisms are connected with the bottom board. The flow division valve block is connected with the hydraulic pumps of three hydraulic drive systems which are of the same structure and independent of one another through pipelines. The hydraulic pump of each hydraulic drive system controls the corresponding lifting mechanism and serves as an independent oil source of the corresponding lifting mechanism. The three-freedom-degree lifting device is suitable for being used as an auxiliary tool for heavy object lifting and carrying, vehicle overhauling and other work and meanwhile the device can be carried for emergency occasions of field vehicle fault maintenance or dragging and the like.

The invention provides an electric energy conversion and switching system for multiple buses in a thermal power plant. The frequency and / or the voltage of at least one connection end can be adjusted by an electric energy converter. Meanwhile, the electric energy is controlled to flow among the buses of the thermal power plant, wherein the buses are different in frequency. Or, the electric energy is controlled to flow among the buses of the thermal power plant, wherein the buses are the same in frequency or are different in frequency. Moreover, the throttling loss is reduced and even eliminated. The performance of a frequency-conversion generator set is fully played and the overall efficiency of the system is improved. As a result, the energy consumption is reduced and higher economic benefits are created. Meanwhile, a bus is divided into a plurality of segments for power supply, so that the running safety and the running reliability of the auxiliary machine of the frequency-conversion system are improved. In addition, through improving the motor starting and switching method of the auxiliary machine of the thermal power plant, the flexibility of the overall operation mode of the system is improved.

The invention discloses a power and backpressure oil electro-hydraulic rigid and flexible combined adjustment and control multi-actuator system. According to the combined adjustment and control multi-actuator system, pressures of oil returning cavities of all actuators, except the actuator with the maximum load, are utilized and controlled through energy regeneration, so that pressures of oil inlet cavities of all the actuators are the same; the pressure differences of all control valve openings are the same, so that the pressure and flow rate of a hydraulic pump are matched with all the hydraulic actuators; and throttling losses, caused by the load differences, of the multi-actuator system are eliminated. By controlling the pressures of the oil returning cavities of the actuators, workingpoints of a power source can be adjusted and controlled; in addition, an adjustment and control unit can be in nonrigid connection with the power source, and the hybrid power function is further expanded to kinetic potential recycling and throttling loss reduction; the energy saving effect is greatly improved, and the investment recovery cycle is greatly shortened; and the power and backpressureoil electro-hydraulic rigid and flexible combined adjustment and control multi-actuator system can be applied and popularized conveniently.

A numerical control hydraulic system of a switched reluctance motor pump belongs to the filed of the hydraulic transmission and the hydraulic machinery. The invention is characterized in that the invention comprises a hydraulic system and a reversible stepless speed regulating system which are connected with each other. Compared with the prior art, the invention realizes speed regulating, direction changing, numerical control of pressure and displacement, which can simplify the structure of the hydraulic system greatly and eliminate the throttling loss in the system. Meanwhile, the invention has the advantages of simple structure, credible work, strong mechanical strength, high efficiency, energy saving, high speed regulating precision, small start electrical current and frequent positive inversion operation, which can realize the high efficient operation in the broad speed regulating range. The invention is applicable to transport machine, forging machine, metallurgy machine, molding machine, oil press, injection molding machine, die casting machine, rolling mill, pressurizer, etc.

The invention relates to a novel system and a method for electric energy conversion and motor switching in a thermal power plant. The method has the advantages that the frequency and / or voltage of at least one connecting end can be adjusted by an electric energy converter, and the electric energy is controlled to flow between auxiliary buses of different frequency, or the electric energy is controlled to flow between the auxiliary buses of the same frequency and different frequency, so that the throttling loss is decreased and even eliminated, the property of a variable-frequency power generator is fully played, and the efficiency of whole system is improved, thereby decreasing the energy consumption, and creating larger economic benefit; the electric connecting relationship of the electric energy converter is increased, more motor starting and switching methods of the auxiliary units with more variety are improved and realized, and the flexibility in running type of the whole system is improved.

The invention discloses a direct-drive hydraulic transmission coal mining machine cutting rotary drum height regulating system. The system comprises a variable-frequency control device (4), a servo electric motor (1), a hydraulic pump (2) and a hydraulic motor (3) which are sequentially connected, wherein an output shaft of the hydraulic motor (3) is hinged to a rocker arm (5); the top of the rocker arm (5) is provided with a rotary drum (6); a detection device (7) used for detecting the rotating direction, the rotating speed and torque signals of the rocker arm (5) is also arranged on the rocker arm (5); and the detection device (7) transmits the actual detection value to the variable-frequency control device (4) to be compared with a preset value and to perform feedback control. Meanwhile, the invention also discloses a height regulating method using the system. When the variable-frequency hydraulic system is used, the electric motor drives the hydraulic pump and can directly realize the speed change, direction change and torque change functions of a height regulating mechanism at the same time; a hydraulic loop structure of the system is greatly simplified; meanwhile, the throttle loss in the hydraulic loop is eliminated; and the obvious energy-saving effect is achieved.

Disclosed is a multi-actuator system for electrohydraulic compound control of backpressure and power oil. A power control unit, a backpressure control unit, a controller, a switching control valve, a hydraulic control one-way valve and a pressure sensor are additionally arranged, pressure of a return oil cavity of an actuator is controlled by an electrical regeneration mode of hydraulic energy, the situation that pressure differentials of actuator control valves of the multi-actuator system under large load differential condition are identical is realized, output pressure and flow of a hydraulic pump are matched with the actuators as required, throttling loss generated from load inconformity is removed, problems that an engineering mechanical hydraulic tank is small resulting in heating and aging of hydraulic oil are solved, discharging is reduced, and energy efficiency is improved.

The invention discloses a direct-drive hydraulic transmission coal mining machine cutting rotary drum height regulating system. The system comprises a variable-frequency control device (4), a servo electric motor (1), a hydraulic pump (2) and a hydraulic motor (3) which are sequentially connected, wherein an output shaft of the hydraulic motor (3) is hinged to a rocker arm (5); the top of the rocker arm (5) is provided with a rotary drum (6); a detection device (7) used for detecting the rotating direction, the rotating speed and torque signals of the rocker arm (5) is also arranged on the rocker arm (5); and the detection device (7) transmits the actual detection value to the variable-frequency control device (4) to be compared with a preset value and to perform feedback control. Meanwhile, the invention also discloses a height regulating method using the system. When the variable-frequency hydraulic system is used, the electric motor drives the hydraulic pump and can directly realize the speed change, direction change and torque change functions of a height regulating mechanism at the same time; a hydraulic loop structure of the system is greatly simplified; meanwhile, the throttle loss in the hydraulic loop is eliminated; and the obvious energy-saving effect is achieved.

The invention designs a throttle-free rotor engine control method, and particularly relates to a throttle-free rotor engine control technology and a hydrogen and gasoline dual-fuel combustion control method. According to the throttle-free rotor engine control method, by eliminating a rotor engine throttle valve device, the hydrogen and gasoline dual-fuel injection strategy of the rotor engine is reasonably regulated and controlled through the output torque and the average indicated pressure cyclic variation coefficient, so that it is guaranteed that the rotor engine stably operates in the throttle-free state. According to the throttle-free rotor engine control method, while the throttling loss of the throttle valve is eliminated and the charge coefficient is improved, the efficient and clean operation of the rotor engine is realized by utilizing the hydrogen fuel injection technology.

The invention discloses a pipe bender with constant pressure hydraulic circuit system. An existing pushing hydraulic cylinder is replaced by an electro-hydraulic mechanical cylinder or a hydraulic mechanical cylinder; a constant pressure network based on secondary regulation is adopted by a hydraulic circuit, a pushing cylinder and a clamping device are connected between a high-pressure oil passage and a low-pressure oil passage in parallel, and control over the pushing cylinder and the clamping device is achieved through displacement of a variable displacement motor. An existing mechanical structure of the pipe bender does not need to be changed, only the hydraulic circuit needs to be changed, the hydraulic cylinder needs to be replaced, thus, the control precision and the operation efficiency can be improved, and resources are saved.

The invention discloses a radial plunger digital variable hydraulic transformer. The rotary oil distribution valve is provided with an oil inlet, an oil return port and multiple oil outlets. The multiple oil outlets are connected to multiple plunger cylinders. The oil tank is connected; the external module is connected through the oil supply check valve, the motor two-position four-way solenoid valve and the rotary oil distribution valve; the oil tank is connected through the oil suction check valve and the hydraulic pump two-position four-way solenoid valve, and the hydraulic pump two-position four-way solenoid valve The valve is connected to the external module through the oil discharge check valve, the two-position four-way solenoid valve of the hydraulic pump is connected to multiple plunger cylinders, and the multiple plunger cylinders are connected to the oil tank through the two-position two-way solenoid valve; the digital controller is connected to the To the hydraulic pump two-position four-way solenoid valve and the motor two-position four-way solenoid valve and two-position two-way solenoid valve. The invention can simultaneously adjust the output flow and output pressure of the transformer to realize power regulation, and can design hydraulic transformers with different voltage regulation accuracy and voltage regulation range according to actual working conditions.

The invention discloses a load difference oil-electro-hydraulic composite back pressure regulation double-actuator system. A power regulation unit, a back pressure regulation unit, a controller, conversion control valves, pilot operated check valves and pressure sensors are additionally arranged, an energy recycling structure is adopted, the pressures of oil return cavities of actuators expect a maximum load actuator are controlled to enable the differential pressures of oil inlet cavities of all the actuators and all control valve ports to be equal, thus, the pressure and flow of a hydraulic pump are matched with all the actuators, and throttling losses of multi-actuator systems caused by load differences are eliminated. Defects in the prior art are effectively overcome, and the double-actuator system has the advantages of high energy efficiency, low emission, kinetic energy recycling, power matching integration and the like in many aspects.

The invention relates to a novel multi-port electric energy conversion and switching system for a thermal power plant. The novel multi-port electric energy conversion and switching system has the advantages that the frequency and / or voltage of at least one connecting end can be adjusted by an electric energy converter, and the electric energy is controlled to flow between auxiliary buses of different frequency, or the electric energy is controlled to flow between the auxiliary buses of the same frequency and different frequency, so that the throttling loss is decreased and even eliminated, the property of a variable-frequency power generator is fully played, and the efficiency of whole system is improved; by adjusting the frequencies of different connecting ends of the electric energy converter, the requirement of motors of auxiliary units using different buses for supplying power running at different frequency in the same period is met, so as to decrease energy consumption, and create larger economic benefit; by improving the motor starting and switching method of the auxiliary units, the flexibility in the running type of the whole system is improved.