80results about How to "Small flow pulsation" patented technology

The invention discloses a low-noise axial plunger pump based on an indexing angle of pumps in series, mainly comprising a main shaft, a bearing, a shell body, a bolt component, a connecting body, an inclined disc, a back-stroke tray, a plunger, a flow distribution plate, a cylinder body and a slippage shoe. The axial plunger pump is provided with two sets of rotor structures which consist of the sliding shoe, the plunger, the cylinder body and the flow distribution plate, an oil sucking hole and an oil discharging hole are shared by two rotor structures, the indexing angle exists between two rotor structures, therefore, a fixed phase difference exists between the dynamic changes of oil discharging quantities of two rotor structures, when two oil flows is converged at the oil discharging hole position, an average effect is generated, the actual exit flow pulsation of the axial plunger pump is reduced by more than 50%, the fluid noise of flow pulsation as a shock excitation source is greatly reduced.

A seawater piston motor low in pulsation belongs to the technical field of hydraulic application and comprises a swash plate, an even number of piston shoes, a piston, a cylinder shaft, a valve plate, an end cover, a casing, a miniature check valve and the like. Damping holes are formed in an upper stop point and a lower stop point of the valve plate and in the end cover. The miniature check valve is arranged between the damping hole of the lower stop point of the valve plate and the damping hole of the end cover. When a high-pressure piston cavity finishes water sucking, and the upper stop point position is reached, high-pressure water in the piston cavity enters the damping hole of the end cover through a damping hole to flow into the inlet position of the check valve. Then the check valve is opened, and the high-pressure water enters a low-pressure piston cavity through the damping hole at the lower stop point position. The high-pressure piston cavity conducts pre-depressurizing, and the low-pressure piston cavity conducts pre-pressurizing. Under the condition of combining the pressures, a pre-pressurizing and a pre-depressurizing effect of the piston cavity is approximately equal to half of the pressure difference of an axial piston motor high-pressure oil draining kidney-shaped groove and a low-pressure oil sucking kidney-shaped groove, pressure impact at the piston motor transition area is reduced, motor output rotating speed and torque pulse are reduced, and the stability is improved.

The invention relates to a hydraulic control frequency stabilized wind power generation apparatus. A system comprises a wind energy collection unit, an energy conversion and remote distance transmission unit and a hydraulic control frequency stabilized power generation unit, wherein the wind energy collection unit converts wind energy into mechanical energy, the energy conversion and remote distance transmission unit is connected with the wind energy collection unit, converts the mechanical energy to hydraulic energy, and realizes the remote distance transmission of the wind energy by adopting a hydraulic transmission principle, and the hydraulic control frequency stabilized power generation unit is connected with the energy conversion and remote distance transmission unit through a hydraulic pipeline, can convert the hydraulic energy into the mechanical energy, and can also convert the mechanical energy into electric energy, wherein the energy conversion and remote distance transmission unit and the hydraulic control frequency stabilized power generation unit are made into a closed type hydraulic loop through the hydraulic pipeline. The invention adopts the initial phase angle change arrangement of a hydraulic pump, and reduces the flow pulsation output by the hydraulic energy. The invention adopts the optimal matching of controlling the entering flow rate of a hydraulic motor and the output volume of the hydraulic motor, generates the constant rotating speed output of the hydraulic motor, drives an ordinary power generator set for generating constant frequency electric energy, and improves the quality of the electric energy.

The invention discloses a valve core of a vane hydraulic motor controller. Triangular grooves (1) are formed along the radial direction on the outer surface of the valve core, the slope angles of the triangular grooves (1) are 45 to 75 degrees, and 12 to 16 triangular grooves (1) are formed. According to the valve core of the vane hydraulic motor controller, by rationally designing the dimensions and the number of the triangular grooves, flow pulsation can be reduced maximally, fluid noise can be controlled maximally, and the processing difficulty and the structure cost of the valve core can be controlled.

The invention provides a low flow pulsation hydraulic pressure transformer, which comprises a spindle, a tilting tray, a left pressure transformation component and a right pressure transformation component, the tilting tray is a conical column table, a transverse through hole is machined in the center of the tilting tray, the spindle is transversely mounted in the through hole, and the left pressure transformation component and the right pressure transformation component are mounted at the left end and the right end of the spindle respectively and symmetrically arranged along a central axis of the tilting tray. By means of coaxial rotation of double rotators, the number of plungers working at each distributing port is doubled in each moment of the rotation process of the rotators, so that the flow pulsation of the hydraulic pressure transformer can be reduced, and system operation stability is improved. By the aid of the tilting tray capable of bidirectionally and freely rotating around the spindle, the pressure of an oil source can be adjusted to an arbitrary value without energy loss.

A cylindrical cam-driven multi-cylinder bi-directional plunger pump comprises a cylindrical cam, a roller, plunger push rods, cylinder bodies and small cylinder bodies, wherein the cylindrical cam is in a cylindrical shape, the top surface and the bottom surface of the cylindrical cam are respectively provided with a cylindrical shaft, the side face of the cylindrical cam is provided with a groove, the roller is arranged in the groove, can slide in the groove and is fixedly connected with the plunger push rods through connecting devices, the two ends of each plunger push rod are provided with plungers which are arranged in the corresponding small cylinder bodies, the small cylinder bodies are positioned in the cylinder bodies and are provided with oil inlets and oil outlets, the cylinder bodies are provided with a main oil inlet and a main oil outlet, and the main oil inlet is communicated with the oil inlets. The cylindrical cam-driven multi-cylinder bi-directional plunger pump provided by the invention can meet the requirements of the plunger pump and reduce the flow pulsation of a reciprocating pump and improve the working efficiency, and has the characteristics of simple and reliable structure, low requirement on the bending resistance of the push rod, larger output and small flow pulsation.

The invention discloses a uniform motion pipeline pump. The uniform motion pipeline pump comprises a pump casing; a cylindrical inner cavity is formed in the pump casing; a plurality of convex curved surfaces are arranged on the inner wall of the cylindrical inner cavity; a central shaft is arranged in the inner cavity of the pump casing; two eccentric wheels are arranged on the central shaft; a bearing is fixed outside each eccentric wheel; a pressing wheel is fixed on each bearing; two gaps are formed between the two pressing wheels and the inner cavity wall of the pump casing; liquid passing pipes which can be deformed elastically are arranged in the two gaps; a filtering joint is arranged on the pump casing, and is provided with a liquid inlet hole and a liquid outlet hole. The liquid passing pipes are compressed completely by pressing wheels at the minimum gaps, and the liquid cannot pass; when the central shaft is driven by the motor to rotate, the pressing wheels press the liquid in the pipes through the liquid passing pipes; pressure difference is formed on the two sides of the minimum gaps; the liquid is inhaled on the low pressure side; the liquid is exhausted on the high pressure side; pulsating flow rates output by the two liquid passing pipes is combined into a flow rate with a relatively uniform pulsating range at the liquid inlet hole and the liquid outlet hole of the filtering joint.

The invention provides a pump. The pump comprises a shell, a driving part and a fluid pumping part. A supporting separation part is arranged in the shell and divides the interior of the shell into a first cavity and a second cavity. An annular groove communicating with the second cavity is formed between the supporting separation part and the inner wall of the shell. The fluid pumping part is mounted in a mounting cavity of the supporting separation part. One end of the driving part penetrates through a through hole in the supporting separation part and then is connected with the fluid pumping part. The fluid pumping part presses fluid in the first cavity into the second cavity and pumps the fluid out of the second cavity. According to the pump, noise generated by the fluid pumping part in the rotating process is effectively absorbed and lowered through fluid filled up in the annular groove, and heat of the shell and the supporting separation part can be taken away. Overall heat dissipation of the shell is facilitated. Flow pulsation is small. The motor efficiency is high. The pump has the characteristics of being compact in structure, low in cost and noise and good in heat dissipation.

The invention discloses a high-temperature dynamic internal gear flowmeter. An internal gear and a shell are fixed together, and the number of small pinions can be 2 to 4. Three pinions are taken as instance for description as follows: a liquid to be measured passes through a pintle valve and a retainer through an oil inlet to enter three oil inlet cavities of the internal gear; the three pinions and the retainer are pushed to move so as to bring the oil into three oil outlet cavities of the internal gear; the oil passes through the retainer and the pintle valve to reach an oil outlet; a flow rate signal of the liquid to be measured is converted to a rotating speed signal of the retainer, and the rotating speed signal is converted to an electric signal by a rotary transducer; and the dynamic flow rate of a system to be measured is determined by the measured electric signal finally. The pinions and the retainer are made of light wear resistant materials and have small moment of inertia; the tooth number of the internal gear is a non-three interger multiple, and the flow rate realizes dislocation and superposition; the flow pulsation of the flowmeter is very small, and the flow quality is obviously improved; and because the flowmeter belongs to a volumetric flowmeter, the flowmeter is not influenced by testing environmental conditions, can accurately measure the high-pressure flow rate of a hydraulic system, has the advantages of wide measuring range, high precision, good reliability and the like, and can be widely used for measuring the flow rate of high-pressure hydraulic systems in the industries such as chemical engineering, coal mine, metallurgy and the like.

The invention discloses a contraposition linear reciprocating pump driving mechanism. The contraposition linear reciprocating pump driving mechanism comprises a slide block mechanism, a crankshaft andan eccentric slide block, wherein the slide block mechanism is composed of a slide block, two connection rods and two pistons, and the central axis of the two pistons is orthogonal to that of the slide block; a crank throw of the crankshaft is sleeved with the eccentric slide block, the slide block concentrically sleeves the eccentric slide block, and the pistons are coaxially inserted into two symmetric slide ways on a reciprocating pump rack; the eccentric slide block rotates on the axis of the slide block around the crank throw while following the crank throw to rotate around the crankshaft, in the entire rotation process, the center axis of the eccentric slide block is maintained parallel to the center axis of the crank throw all the time, so that the movement trail of the eccentric slide block in the horizontal direction is approximately linear, through the eccentric slide block, the slide block is driven to conduct linear movement, and then the two pistons conduct reciprocatinglinear movement in the two symmetric slide ways of the reciprocating pump respectively.

The invention discloses a tandem type low impulse internally engaged gear pump with a malposition angle. A front gear box is connected and mounted between a front cover and a connection body, a rear gear box is connected and mounted between a rear cover and the connection body, and the front gear box and the rear gear box are of a same structure, and each comprises a front bearing disc, a shell and a rear bearing disc. A driving gear shaft is coaxially connected with a linkage gear shaft, power is input into the driving gear shaft, and the driving gear shaft drives the linkage gear shaft to conduct torque transmission. The driving gear shaft and the linkage gear shaft are both of a stepped shaft structure which is mainly composed of a front shaft section, a rear shaft section and a gear section. The gear sections of the driving gear shaft and the linkage gear shaft are mounted in the front gear box and the rear gear box correspondingly in a sleeving mode, and the gear sections of the driving gear shaft and the linkage gear shaft are mounted in the gear boxes through crescent gear ring assemblies. The tandem type low impulse internally engaged gear pump can make the flow impulse atan outlet decrease by more than 65%, and the purpose that the flow impulse at the outlet of the gear pump is reduced is achieved.

The invention relates to an integrated low-pulsation seawater desalination energy recovery and pressurization device. A structure type of a rotary pressure exchanger and a swash plate plunger type booster pump is adopted; the low-pressure area of a fresh seawater valve plate has an open design; a pressure exchanger cylinder hole directly sucks water from a cavity of a device shell during operation, so that the suction performance is improved; the inlet of the booster pump is equipped with high-pressure water, so that the self-suction performance is improved; the flow pulsation of a high-pressure seawater outlet is reduced through water suction and drainage of a plurality of plungers, the flow quality of an energy recovery supercharging device is improved, the impact of the outlet flow pulsation of the device outlet on a reverse osmosis membrane is reduced, and the service life of the reverse osmosis membrane is improved. The device provided by the invention overcomes the defects of lowintegration degree, large flow pulsation, large volume weight and the like of a rotary energy recovery device in the prior reverse osmosis seawater desalination system, and has the obvious technicaladvantages of high energy recovery rate, high flow quality, high integration degree, small structure size and the like.

The invention discloses an axial flow type mud pulse slow release machine. The axial flow type mud pulse slow release machine comprises a cavity filled with inert gas; the cavity includes a cover and a rubber inner cylinder; two ends of the rubber inner cylinder are respectively connected with a first outlet pipe and a second outlet pipe; and the inner diameters of the first outlet pipe and the second outlet pipe are the same, and are smaller than the inner diameter of the rubber inner cylinder. The axial flow type mud pulse slow release machine reduces pressure fluctuation and flow pulsation in an absorption pipeline through the large-diameter cavity and the inert gas filled between the rubber inner cylinder and an outer cylinder. In addition, an adjustable mechanism is designed by using a mud inlet pipe with a rectangular thread, an added pre-pressure spring and self elasticity of the rubber inner cylinder; and an adjustable rotating drum out of an end cover rotates to stretch the rubber inner cylinder to change the rigidity of the rubber cylinder to adapt to mud currents with different parameters so as to achieve an effect of reducing the mud pulse to the maximum extent. Finally, the mud pulse slow release machine adopts a split design; and although the part number is relatively increased, the part manufacturing difficulty is reduced.

The invention discloses a vehicle frame fatigue test machine for a hand moving vehicle. The vehicle frame fatigue test machine for the hand moving vehicle comprises a pedestal, a supporting platform plate and a hydraulic oil cylinder, wherein the supporting platform plate is arranged on the pedestal and is adjustable in height; the hydraulic oil cylinder is rotatably connected with the pedestal; arocker arm fixing base is arranged on the hydraulic oil cylinder; an upper position sensor and a lower position sensor which are fixedly connected with the hydraulic oil cylinder are arranged above the rocker arm fixing base; the upper position sensor and the lower position sensor are in signal connection with a control assembly; the hydraulic oil cylinder is connected with an oil supply system;the oil supply system is controlled by the control assembly; the vehicle frame fatigue test machine for the hand moving vehicle also comprises a balancing weight positioned above the pedestal; and side frames which are in rolling connection with the pedestal are arranged on the two sides of the balancing weight. The fatigue test machine adopts automatic control, has high test efficiency, has a memory function after power failure, is safe and convenient to operate, and has perfect integrated function and high practicability.

The invention provides a coaxial pump set double-pump converging working condition flow pulsation phase complementary structure. The structure comprises a driving shaft, a driven shaft, a first gear pump set and a second gear pump set, and a pair of spur gears in each gear pump set are connected with key groove sets in the driving shaft and the driven shaft through multiple keys respectively; a spline is arranged at one end of the driving shaft, the end face of the driving shaft on one side of the spline is taken as a datum plane, the driving shaft and the driven shaft are provided with a first key groove set close to the datum plane and used for installing the first gear pump set and a second key groove set away from the datum plane and used for installing second gear pump set, and a staggered phase angle exists between the first key groove set and the second key groove set. Through staggered tooth phase adjustment of the spur gears, so that the phase deviation exists in the meshing process of the two gear pumps, the peak-valley superimposition of the meshing stiffness of the spur gears is achieved, the meshing stiffness fluctuation coefficient is reduced, two flow pulsations arecaused to be counteracted from each other, and the outlet flow pulsation of the gear pumps is reduced.

The invention belongs to the field of fluid drive and control, and particularly relates to a noise reduction method for a plunger pump and a noise reduction device thereof. A filtering cavity is connected with a valve plate, the filtering cavity has a filtering function utilized to filter hydraulic oil in a plunger cavity, and after the plunger cavity is contacted with the filtering cavity, the pressure fluctuation in the plunger cavity can be reduced; oil fluid in the plunger cavity is pressurized through a pressure boost cavity, a differential pressure between the plunger cavity and a plunger pump eduction oil cavity can be reduced so as to reduce the outlet flow fluctuation of a fluid pump. A metal corrugated pipe is connected with the valve plate through damping pinholes to form an RCfilter, the metal corrugated pipe can be dismantled and has different specifications, the damping pinholes can be adjusted, and the filter range can be adjusted by changing parameters of the metal corrugated pipe and damping pinholes. According to the plunger pump working in different conditions, the parameters can be adjusted to achieve a best noise reduction effect.

The invention discloses a horizontal type spatial multiphase crank pump which comprises a bottom plate, an outer baffle plate, hydraulic cylinders, an inner baffle plate, two connecting rods, a secondcrank, a bearing pedestal, pistons, a first crank pin, a bearing transparent cover, a first crank, a second crank pin, a bearing end cover, a bearing, a third crank, a third crank pin, a motor rack and a motor. The horizontal type spatial multiphase crank pump has the following advantages: a sectional type crankshaft is adopted to drive the two connecting rods to move; and multiple groups of cylinder blocks work simultaneously to meet the long stroke requirement of the piston, realize large flow operation and greatly improve the overall performance of the pump. The three crank pins are distributed on the circumference in 120-degree phase difference; each of the crank pins drives the two connecting rods to move simultaneously; the pistons driven by the two connecting rods are in 180-degreephase difference; through flow superposition of the multiple cylinders, the pump is ensured to have smaller flow pulsation and liquid supply pressure; the six hydraulic cylinders adopt opposite horizontal type layout; and compared with the traditional reciprocating pump structure, the horizontal type spatial multiphase crank pump is more compact and stable in structure, so that the size and weight of the pump are reduced.

Disclosed is a roller type force balancing unit pump. A rolling bearing is mounted between a right coupling and a right roller assembly. Left and right cams are symmetrically distributed on both sidesof a pump core assembly with the phase difference of 90 DEG. A roller assembly rolls on the cam surfaces. Four conical rollers are distributed on the single side. Every two conical rollers are fixedto a C-shaped roller support as a group through a pin shaft. A copper sleeve of a pump core assembly and a cylinder body are respectively provided with two pairs of rectangular high pressure and low pressure oil holes uniformly distributed in the circumferential direction. The rectangular high pressure and low pressure oil holes correspondingly make contact with first and second flow distributiongrooves in the upper portions of a piston to suck and discharge oil. The cylinder body is provided with an annular oil groove communicating with the high-pressure oil holes, and oil liquid flowing outof the two high-pressure oil holes is collected together. The mass of a rotor which is composed of a first roller support assembly, a third roller support assembly, a transmission shaft and left andright concentric rings should be equal to the sum of the mass of a rotor which is composed of a second roller set, a fourth roller support assembly and the piston. First high pressure and low pressurecavities in a pump core communicate with the first flow distribution groove of the piston all the time. Second high pressure and low pressure cavities communicate with the second flow distribution groove of the piston all the time.

The invention provides a duplex external gear pump which comprises a pump body, a driving gear, a first-stage driven gear set, a second-stage driven gear set and a variable plunger. The driving gear, the first-stage driven gear set and the second-stage driven gear set are located in the pump body, the first-stage driven gear set and the second-stage driven gear set are in meshing connection with different radial sections of the driving gear respectively, a first-stage oil suction cavity and a first-stage oil discharge cavity are formed in the meshing position of the driving gear and the first-stage driven gear set, and a second-stage oil suction cavity and a second-stage oil discharge cavity are formed in the meshing position of the driving gear and the second-stage driven gear set. The variable plunger is movably connected with the pump body so as to control the communication relation between an oil inlet and the first-stage oil suction cavity and the second-stage oil suction cavity, the communication relation between an oil outlet and the first-stage oil discharge cavity and the second-stage oil discharge cavity and the communication relation between the first-stage oil discharge cavity and the second-stage oil suction cavity. The duplex external gear pump disclosed by the invention can be switched between high-pressure small flow and low-pressure large flow, can be used under more working conditions, and has higher use efficiency.

The invention provides a plunger pump water-supply system, a fire-fighting machine and a building. The plunger pump water-supply system comprises a plurality of plunger pumps, oil pumps and reversing valves. Each plunger pump comprises an oil cylinder and a water cylinder connected with the oil cylinder through a piston rod and further comprises a controller and a position sensor, wherein the position sensor is used for acquiring the moving position of the piston rod of the plunger pump, the signal output end of the position sensor is connected with the controller, and the signal output end of the controller is connected with the reversing valve. The controllers are used for controlling the action sequence of the multiple plunger pumps according to signals of the position sensors and/or controlling the moving speeds of the piston rods of the plunger pumps according to the signals of the position sensors. According to the plunger pump water-supply system, closed-loop control is adopted so that it can be ensured that the multiple plunger pumps act in the designed sequence for a long time, the pumping continuity is good, and flow pulsation is small. Meanwhile, through the position sensors, the speeds of the plunger pumps can be monitored and adjusted in time, and the water supply continuity of the system can be improved.

The invention discloses a rotating speed control system and method of water hydraulic motor. The method comprises the following steps that 1, fuzzy control is used for overcoming the defect that because a traditional control mode is not high in control precision, the traditional control mode cannot adapt to the variable quantity and non linearity of a water hydraulic system; 2, feedforward is carried out by utilizing target rotating speed, and the rotating speed fluctuation of the water hydraulic motor is compensated in advance according to the total volume efficiency feedback mode of the system; 3, the difference between the theoretical rotating speed of a servo motor and the actual rotating speed is fed back, a local small closed loop is formed on the control of the rotating speed of theservo motor, and the precision of the rotating speed control of the servo motor is improved; 4, the interference components in the flow signals are stripped based on a multi-resolution analysis theory, and then the signals are reconstructed; and 5, wavelet transformation is carried out on the rotating speed signals to reduce or eliminate quantization errors in the rotating speed information. Thecontrol precision of the rotating speed of the hydraulic motor is high, and the response speed is high, the anti-disturbance capability is strong, and the rotating speed of the water hydraulic motor is smooth.