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 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 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.

An electric energy conversion and switching system and method applied to a thermal power plant, through which the frequency and/or voltage of at least one connection terminal can be adjusted, and the electric energy can be controlled to flow between plant buses of different frequencies, or both Controlling electric energy at different frequencies can also control electric energy flowing between plant buses of the same frequency, reduce or even eliminate throttling loss, give full play to the performance of variable frequency generator sets, improve the overall efficiency of the system, thereby reducing energy consumption and creating greater economy At the same time, it improves the method of starting and switching the electric motor of the factory auxiliary machine, and improves the flexibility of the overall operation mode of the system.

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 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.

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.