53 results about "Variable displacement pump" patented technology

The invention relates to the technical field of non-variable-capacity pump set parallel control, and discloses a multi-blower parallel air volume control method, which comprises the following steps of: acquiring the real-time rotating speed and the real-time input power of a driving frequency converter of each single blower in a parallel system, and superposing a periodic rotating speed perturbation signal at a common pressure given value to obtain a multi-blower parallel air volume control result; power response amplitudes of all single blowers are extracted synchronously, the change rate of real-time power relative to the rotating speed is calculated to generate a power response gradient representing the energy conversion characteristic of the unit, the unbalanced blowers are recognized according to deviation parameters of the power response gradient relative to the global average value, the rotating speed instruction gain of the blowers is reduced, and the unit energy conversion characteristic is obtained. According to the method, load distribution is converted into an active adjustment mechanism based on the physical characteristics of the impeller, accurate identification of the offset of the physical operation sites of the parallel unit is achieved, and the accuracy of the offset of the physical operation sites of the parallel unit is improved on the premise that branch flow sensing hardware is not needed. And the recessive surge risk caused by single-machine performance discretization is inhibited.

The application relates to the technical field of centrifugal pumps, and particularly discloses a high-sealing non-variable-volume pump and components thereof, which comprises a pump shell and an impeller, a water inlet and a water outlet are respectively arranged on the pump shell, the pump shell is in a volute type, the volute type comprises a wide section and a narrow section, and the pump shell further comprises a flow assisting mechanism which comprises a flow distribution port and a flow distribution sleeve arranged on the narrow section of the pump shell, a plurality of liquid inlet holes are arranged in a circular array on the water inlet, and the flow distribution sleeve is covered on the flow distribution port and the liquid inlet hole at two ends respectively. In the application, the flow distribution sleeve guides the fluid into the flow distribution sleeve along the flow distribution port at the narrow section of the volute type with the largest pressure during the operation of the impeller, then the flow distribution sleeve supplements the fluid to the water inlet of the pump shell, and the negative pressure at the water inlet is supplemented to reduce the cavitation and prolong the service life of the centrifugal pump.

A hydraulic pump circuit for a hydraulic system on a work machine may include a variable displacement pump in fluid communication with a hydraulic system via a supply line on a work machine. The variable displacement pump may be configured to provide hydraulic fluid flow to the hydraulic system. The hydraulic pump circuit may also include a stroke actuator in fluid communication with the supply line via a restriction orifice and may be configured for controlling the displacement volume of the variable displacement pump. The hydraulic pump circuit may also include a control valve configured for controlling the stroke actuator to upstroke and de-stroke the pump. The hydraulic pump circuit may also include a cutoff valve arranged and configured to de-stroke the pump when a threshold pressure develops within the hydraulic system.

This utility model relates to the field of hydraulic pumping unit technology, and in particular to a one-to-two hydraulic pumping unit, comprising a mounting base plate, with support frames mounted on both the left and right sides of the top front side of the mounting base plate. Servo hydraulic cylinders are installed inside the support frames, and displacement sensors are installed inside the servo hydraulic cylinders. A hydraulic oil tank is bolted to the rear side of the top of the mounting base plate, and a proportional valve and a variable displacement pump motor are bolted to the top of the hydraulic oil tank. An accumulator is connected to the front side of the solenoid valve assembly. The proportional valve controls the two variable displacement pump motors to alternately work to supply oil to the servo hydraulic cylinders at both ends. When one servo hydraulic cylinder rises, the other servo hydraulic cylinder descends, transferring hydraulic energy to the other lifting variable displacement pump motor, causing the servo hydraulic cylinders at both ends to reciprocate. This one-to-two configuration achieves energy recovery and improves production efficiency.

The utility model relates to the technical field of hydraulic pressure, in particular to an open type plunger variable pump which comprises a pump body, a control valve body is installed on the pump body, the control valve body comprises a flow control valve and a pressure valve, a flow valve cavity is formed in the flow control valve, and a pressure valve cavity is formed in the pressure valve. A middle oil channel connecting the flow valve cavity and the pressure valve cavity is arranged in the control valve body, a pressure oil channel connecting the pressure valve cavity and the variable cavity is arranged in the control valve body, a flow oil channel connecting the flow valve cavity and the pressure valve cavity is arranged in the control valve body, an oil return channel is arranged on the pump body, one end of the oil return channel is connected with the flow oil channel, and the other end of the oil return channel is connected with the variable cavity. The other end of the oil return channel is connected with the oil outlet, the control valve body is provided with a load oil port connected with a load pipeline, and the load oil port is communicated with the flow valve cavity. According to the open type plunger variable pump, the flow and the pressure of the variable pump can be accurately and visually controlled, and the response speed, the equipment stability and the operation convenience of a system are improved.

A hydraulic pump circuit for a hydraulic system on a work machine may include a variable displacement pump in fluid communication with a hydraulic system via a supply line on a work machine. The variable displacement pump may be configured to provide hydraulic fluid flow to the hydraulic system. The hydraulic pump circuit may also include a stroke actuator in fluid communication with the supply line via a restriction orifice and may be configured for controlling the displacement volume of the variable displacement pump. The hydraulic pump circuit may also include a control valve configured for controlling the stroke actuator to upstroke and de-stroke the pump. The hydraulic pump circuit may also include a cutoff valve arranged and configured to de-stroke the pump when a threshold pressure develops within the hydraulic system.

This utility model provides a hydraulic system and a dump truck. The hydraulic system includes a hydraulic oil tank, a variable displacement pump, a steering valve assembly, a steering mechanism, a brake valve assembly, a parking brake, a lifting mechanism, an emergency pump, and an emergency valve assembly. The variable displacement pump and the emergency pump are connected to the hydraulic oil tank. The steering valve assembly is connected to the variable displacement pump and supplies oil to the steering mechanism. The lifting mechanism is connected to the steering valve assembly via a first oil circuit. The brake valve assembly is connected to the parking brake via a second oil circuit. The emergency valve assembly is connected to the emergency pump, and is connected to the steering valve assembly via a first emergency line and to the brake valve assembly via a second emergency line. The oil passing through the emergency pump is defined as emergency oil. The emergency oil, via the emergency valve assembly, can be used for emergency steering, emergency lifting, and releasing the parking brake. This utility model's hydraulic system can solve the problem of dump trucks being unable to work normally under fault conditions and the need for relocation and repair, improving relocation and repair capabilities.

The invention relates to the technical field of driving gear shifting control of hydrostatic driving vehicles, in particular to an electro-hydraulic system of a hydrostatic driving vehicle, a control method and engineering machinery. Comprising a variable displacement motor, a forward rotation oil port and a reverse rotation oil port are connected with a variable displacement pump through a forward rotation oil way and a reverse rotation oil way respectively, and the variable displacement motor is further connected with a displacement control mechanism. The bypass valve group is connected between the forward rotation oil way and the reverse rotation oil way and comprises a bypass control mechanism used for controlling connection and disconnection between the forward rotation oil way and the reverse rotation oil way. The input end of the gearbox is connected with an output shaft of the variable displacement motor, the output end of the gearbox is connected with the wheel transmission mechanism, and the synchronizer is connected with the gear switching control mechanism. Zero displacement control of the motor can be achieved through the displacement control mechanism, on the basis of achieving zero displacement control of the motor, the bypass control mechanism can prevent a gearbox from being damaged by heavy load sliding abrasion when the gear switching control mechanism executes gear shifting through unloading, and safety control over the gear shifting process is achieved.

The invention discloses an agricultural machinery chassis closed type hydraulic walking system and agricultural machinery equipment, and relates to the technical field of agricultural equipment control, the agricultural machinery chassis closed type hydraulic walking system comprises an engine, the engine is connected with a first output shaft and a second output shaft through a one-to-two dragging box, and the first output shaft is connected with a driving module of two right wheels; a second output shaft is connected with a driving module of the two left wheels; the driving module comprises a variable pump and a double-speed hydraulic motor, and two working oil ports of the variable pump are correspondingly connected with two oil ports of the double-speed hydraulic motor to form a closed circulation loop; the double-speed hydraulic motor is connected with a motor control loop and a heat dissipation branch; the motor control loop comprises an electromagnetic reversing valve, the heat dissipation branch comprises an overflow valve, a spring reset reversing valve and a radiator, the electromagnetic reversing valve and the spring reset reversing valve are both connected with two oil ports of the double-speed hydraulic motor in parallel, and the radiator is connected with the spring reset reversing valve through the overflow valve. Through four-pump four-motor closed driving and electromagnetic proportional control, the movement reliability of the chassis is ensured.

The invention discloses a rock drill drilling hydraulic system, which relates to the technical field of rock drill hydraulic systems and comprises a hydraulic power unit, an impact execution unit, a propulsion execution unit, a geological sensing unit, an intelligent control unit and an oil temperature adjusting unit. A variable displacement piston pump of the hydraulic power unit supplies energy to the system; the geological sensing unit collects geological parameters through a drill rod torque sensor and a vibration sensor; the intelligent control unit calls a pre-stored mapping relation table to be matched with target impact pressure, precise pressure control is achieved through a PID adjusting impact valve set, and the displacement of a variable pump is synchronously adjusted; the oil temperature adjusting unit is linked with the plate heat exchanger through the temperature sensor to cool oil temperature. According to the system, self-adaptive adjustment of impact pressure of different geological stratums is achieved, throttling loss is avoided, oil temperature rising is relieved, the drilling efficiency is improved by 15%-20% through cooperation of the two, the continuous operation oil temperature is controlled to be 60 DEG C or below, the service life of equipment is prolonged, and the maintenance cost is reduced.

A drive system for a work vehicle, for example a truck-mounted forklift, with at least one driven wheel, and the drive system includes a hydraulic pump designed to drive the driven wheel, and an electric motor mechanically coupled to the hydraulic pump. The electric motor is designed to drive the hydraulic pump, and the hydraulic pump is a variable displacement pump.

A refuse vehicle includes a chassis and a vehicle body. A variable displacement pump is positioned within the vehicle body and is configured to pump hydraulic fluid from a hydraulic fluid reservoir into a high pressure line of a hydraulic circuit. A lifting system on the vehicle includes at least one actuator in fluid communication with the variable displacement pump, which delivers pressurized hydraulic fluid from the hydraulic fluid reservoir to the actuator through the high pressure line to adjust a position of the actuator. A valve is positioned downstream of the variable displacement pump. In a first valve position, the valve restricts flow outward from the high pressure line. In a second valve position, the valve directs fluid from the high pressure line into a lower pressure line to reduce a hydraulic pressure within the high pressure line and adjust an output parameter of the variable displacement pump.

This invention relates to the field of variable displacement pump technology and discloses a crankshaft pump assembly, including a housing. Within the housing are a plunger pump assembly and a crankshaft drive assembly. The plunger pump assembly includes a pump cylinder and a plunger. A transfer chamber is located at the bottom of the pump cylinder, and a gap-sealing chamber is located between the transfer chamber and the pump cylinder. A gap-sealing assembly is located at the bottom of the plunger, including a connecting seat and a slip ring. The slip ring and the connecting seat are connected by multiple elastic connecting pieces. A flexible filter screen is installed in the gap between the slip ring and the connecting seat. This invention utilizes a flexible filter screen to completely seal the gap between the plunger and the gap-sealing chamber. During the downward movement of the plunger, solid particles are prevented from moving towards the outer wall area of ​​the plunger, avoiding collisions and damage to the outer surface of the plunger caused by harder solid particles. This further improves the service life of the plunger and the sliding sealing assembly, enhancing the long-term sealing effectiveness of the crankshaft pump.

A system comprises an actuation pump sub-system (APS) with an APS inlet to feed fuel from a fuel source into the APS, a first outlet for connecting the APS in fluid communication with an actuation sys

The utility model relates to a hydrostatic engineering machinery drive axle, which comprises an engine, a gearbox, a front transmission shaft, a front axle drive, a rear transmission shaft and a rear axle drive, the hydrostatic transmission system comprises a variable pump connected with the engine, a hydraulic motor connected with the input end of the gearbox and a reversing control valve connected between the variable pump and the hydraulic motor, and the variable pump, the reversing control valve and the hydraulic motor are connected to form a closed hydraulic loop; the front output shaft is provided with an off-axle clutch for controlling the front transmission shaft to be combined with or disconnected from the front output shaft, and the hydrostatic transmission system is connected with the off-axle clutch and controls the off-axle clutch to be combined with or disconnected from the front output shaft. The closed hydraulic loop is used for replacing a hydraulic torque converter, the transmission efficiency is improved, the energy consumption is reduced, the working condition adaptability of the whole machine is improved, and good fuel economy is achieved.

The invention relates to the technical field of variable displacement pumps, and discloses a crankshaft pump assembly which comprises a machine shell, a plunger pump assembly and a crankshaft driving assembly are arranged in the machine shell, the plunger pump assembly comprises a pump cylinder and a plunger, a transfer cavity is formed in the bottom of the pump cylinder, a gap increasing cavity is formed between the transfer cavity and the pump cylinder, and a gap blocking assembly is arranged at the bottom of the plunger. The seam blocking assembly comprises a connecting base and a sliding ring, the sliding ring and the connecting base are connected through a plurality of elastic connecting pieces, and a flexible filter screen is arranged in a gap between the sliding ring and the connecting base. The gap between the plunger and the gap increasing cavity is blocked in the whole process by means of the flexible filter screen, solid particles can be prevented from moving towards the outer wall area of the plunger in the downward movement process of the plunger, damage caused by collision between some hard solid particles and the outer surface of the plunger is avoided, and the service life of the plunger is prolonged. The service life of the plunger and the sliding sealing assembly is further prolonged, and the long-term sealing effectiveness of the crankshaft pump is improved.

Apparatus and associated methods relate to a fueldraulic valve configured to provide bypass regulation of fueldraulic power provided by a variable-displacement hydraulic pump and to simultaneously provide backup fueldraulic power for the variable displacement actuator pump. Bypass regulation is provided by moving a bilaterally moveable spool within a hydraulic cylinder from a first position so as to provide fluid conductivity between an actuation-supply port and a drain port. Backup fueldraulic power is provide by moving the bilaterally moveable spool further within a hydraulic cylinder from a first position so as to provide fluid conductivity between an actuation-supply port and an afterburner-supply port.

A hydraulic pump circuit for a hydraulic system on a work machine may include a variable displacement pump in fluid communication with a hydraulic system via a supply line on a work machine. The variable displacement pump may be configured to provide hydraulic fluid flow to the hydraulic system. The hydraulic pump circuit may also include a stroke actuator in fluid communication with the supply line via a restriction orifice and may be configured for controlling the displacement volume of the variable displacement pump. The hydraulic pump circuit may also include a control valve configured for controlling the stroke actuator to upstroke and de-stroke the pump. The hydraulic pump circuit may also include a cutoff valve arranged and configured to de-stroke the pump when a threshold pressure develops within the hydraulic system.

Hydrostatic drive with a variable displacement pump (12), with two hydraulic motors (10, 11) arranged in series and supplied with hydraulic fluid by the variable displacement pump (12) in a closed hydraulic circuit, and with a flow control valve (20) through which a hydraulic fluid flow rate flows from a line section (15) between the two hydraulic motors (10, 11) to a pressure sink, characterized in that the flow control valve (20) is integrated into the housing (30) of a first of the two hydraulic motors (10), wherein the hydraulic fluid flow rate limited by the flow control valve (20) flows into the housing (30) of the first hydraulic motor (10) and flows back to a tank (24) via its leakage port (L).

The present disclosure relates to a method for controlling a backhoe loader and a backhoe loader, and relates to the field of engineering machinery. The method for controlling a backhoe loader includes: setting a power upper threshold P_0 for a variable displacement pump of the backhoe loader according to an operating mode of the backhoe loader; where the backhoe loader includes an engine, the variable displacement pump, a traveling system, a loading operation system, and a digging operation system; the operating mode includes: a traveling mode, a loading operation mode, and a digging operation mode; and adjusting the power upper threshold P_0 of the variable displacement pump according to an actual load of the backhoe loader in a current operating mode. In the technical solutions, the power upper thresholds P_0 are different in different operating modes. Power of the variable displacement pump is adjusted in real time.

A fluid system 10 comprises a boost pump 14 connected to an inlet line 22 to receive input flow, a boost line 24 connected to an outlet of the boost pump 14, a variable displacement pump 16 connected

The present application relates to diesel generator set test equipment technical field, specifically for remote management cabinet integrated diesel generator test load air inlet alarm control device based on non variable displacement pump, including non variable displacement pump unit, air inlet baffle control unit, operation range monitoring unit, central processing unit and alarm unit, central processing unit receives starting signal, dynamic adjustment centrifugal fan speed and PID control air inlet baffle opening, ensure that the heat dissipation air volume meets the demand;Operation range monitoring unit acquires point cloud data through 3D camera, and the moving target in the warning area is identified by intrusion detection algorithm, and multi-stage alarm and safety interlocking forced shutdown are triggered;After test stops, calculate delay time to close air duct, and protect components cooling;The air pressure sensor monitors the air duct state in real time, and timely early warning blockage or leakage fault.The present application has high integration degree, precise heat dissipation, comprehensive safety protection, strong adaptability, effectively improves diesel generator test load operation stability and safety.

A piston-based pump machine can include a reciprocating driver; at least one piston arranged at least partially in a respective at least one cylinder that is arranged relative to the reciprocating driver for selective engagement with the at least one piston; and a controller configured, in operation, to electronically modulate a time-varying magnetic field for the at least one cylinder such that interaction between the reciprocating driver and the at least one piston caused by the time-varying magnetic field causes selective engagement, disengagement, or modulation of displacement of each piston relative to the at least one cylinder. Related systems and methods are also disclosed.

A system for intelligent lubrication control in a high-speed mechanical transmission, the system comprising: a transmission housing enclosing a plurality of meshing gears mounted on rotating shafts and supported by bearing units; a plurality of sensor units physically mounted at predetermined locations within the transmission housing near gear engagement surfaces, bearing raceways, and shaft journals, each sensor unit comprising at least one temperature sensor, at least one vibration sensor, and at least one speed sensor, as well as an associated signal conditioning circuit configured to generate conditioned electrical signals representing operating parameters;a data acquisition module electrically connected to the plurality of sensor units and comprising an analog-to-digital conversion circuit configured to digitize the processed electrical signals; a hardware-based control unit comprising a microcontroller, a field-programmable gate array, and associated memory and input / output circuitry, wherein the control unit is configured to receive the digitized signals and generate control outputs based on predetermined threshold conditions; a lubricant supply system comprising a variable displacement pump driven by an electromechanical actuator, a plurality of electronically actuated microvalves arranged along a distributed lubricant network, and a plurality of lubrication channels formed in the gearbox housing and terminating at targeted lubrication points;and a multitude of flow control nozzles configured to direct lubricant to selected areas of the multitude of meshing gears and bearing units, the control unit being electrically coupled to the variable displacement pump and the multitude of electronically actuated microvalves to control lubricant flow rate, pressure and distribution depending on the operating parameters.

This invention relates to the field of hydraulic technology, specifically to a displacement-adjusting hydraulic unit and a travel hydraulic system. The displacement-adjusting hydraulic unit acts on a hydraulic pump, which is a variable displacement pump driven by a speed-adjustable engine. It includes: a variable displacement piston configured to adjust the displacement of the hydraulic pump; a control valve configured to control the oil inlet and outlet of the variable displacement piston; and a DA valve, whose inlet X is connected to a replenishment oil source M, and whose outlet Y generates an actuation pressure proportional to the engine speed. The pilot pressure of the control valve comes from the actuation pressure generated by the DA valve, and the hydraulic oil source controlled by the control valve to be output to the variable displacement piston comes from the replenishment oil source M. This invention solves the technical problem in the prior art where the series closed-loop pump uses a combination of hydraulic direct control and a DA valve, resulting in different swing forces between the front and rear pumps due to differences in internal components, leading to a large difference in the output flow rate between the front and rear pumps, and causing high deviation in the travel machinery.

The present application relates to the technical field of non-variable displacement pump design, and discloses a micro centrifugal pump blade setting angle correction method based on Reynolds number sensitivity analysis, which comprises the following steps: firstly, constructing a reference parameterized geometric model and a calculation domain; secondly, based on the dynamic similarity principle, constructing an equivalent Reynolds number working condition library by adjusting the fluid dynamic viscosity, performing CFD numerical simulation and extracting a velocity vector; then, calculating an actual fluid outflow angle, constructing a Reynolds number sensitivity function and a slip amplification coefficient; finally, deriving a target theoretical outflow angle based on a target lift, combining a prediction model to perform reverse amplification compensation on the blade setting angle, and automatically reconstructing a corrected impeller entity model. The present application quantifies the nonlinear slip rule under micro scale, ensures that the micro impeller can still output the expected theoretical lift under extremely small space and extremely low Reynolds number, realizes lift standard without repeatedly manufacturing physical prototypes, and greatly reduces trial and error costs.

The invention discloses a swing piston variable displacement pump for an electric automobile. The swing piston variable displacement pump comprises a main body bracket and a driving mechanism mounted in the main body bracket, the driving mechanism is provided with two output shafts rotating synchronously, and the two output shafts extend out of the two opposite side faces of the main body support respectively. Comprising pump bodies in one-to-one correspondence with the two output shafts. The two pump bodies are respectively connected with the same fixed shaft at the upper end of the main body bracket; a matched swing piston is arranged in a pump cavity in each pump body, a piston rod of each swing piston is connected with the eccentric disc of the corresponding output shaft through a hinge shaft, each eccentric disc is rotationally connected with the corresponding hinge shaft through a bearing, and the fixed shaft is rotationally connected with the corresponding pump body through a bearing. Lubricating oil is mixed in compressed air, so that the bearing is always in an oil lubrication state, the lubricating oil takes away more heat, a lubricating system of the bearing is prevented from being damaged by high temperature, and the probability of lubrication failure faults caused by high-speed rotation and long-term rotation of the bearing is greatly reduced.

A system includes an actuation pump sub-system (APS) with an inlet configured to feed fuel from a fuel source into the actuation pump sub-system, a first outlet configured for connecting the APS in fluid communication with an afterburner selector valve, a second outlet, and a third outlet for connecting the APS in fluid communication with an actuation system to supply washed fuel flow for actuation. A main pump and control sub-system (MPCS) has a main inlet connected in fluid communication with the supply line downstream of the second outlet of the APS, and a main outlet for supplying fuel to a downstream gas generator. An afterburner pump in fluid communication to supply an afterburner control. An afterburner selector valve (ASV) in fluid communication with the MPCS, the wash line, and the afterburner pump.

A hydraulic system includes: a first bi-directional pump connected to a head-side chamber of a single-rod cylinder by a head-side line and connected to a rod-side chamber of the single-rod cylinder by a rod-side line; and a second bi-directional pump connected to the head-side line by a supply / discharge line, the second bi-directional pump being a variable displacement pump. The hydraulic system further includes a low-pressure selection valve connected to the head-side line by a first discharge line and connected to the rod-side line by a second discharge line, wherein the low-pressure selection valve allows the second discharge line or the first discharge line to communicate with a relief line on which a relief valve is located.

The invention relates to the field of variable displacement pump assemblies, in particular to a PEEK valve plate and air valve assembly with excellent wear resistance, which comprises a threaded column, a lower valve seat sleeves the lower part of the outer surface of the threaded column in an attached manner, a lower valve plate and a PEEK valve plate sleeve the outer surface of the threaded column above the lower valve seat, the PEEK valve plate is attached to the upper end of the lower valve plate, and the PEEK valve plate is attached to the upper end of the lower valve plate. The lower valve seat, the lower valve plate and the air channel in the PEEK valve plate are aligned, an elastic supporting adjusting piece is arranged among the PEEK valve plate, the lower valve plate and the lower valve seat, the outer surface of the threaded column is sleeved with an upper valve seat in an attached mode, the upper valve seat is tightly pressed at the upper end of the PEEK valve plate, and the upper valve seat and the air channel in the PEEK valve plate are arranged in a staggered mode. A nut is screwed on the upper portion of the outer surface of the threaded column. According to the air valve assembly, stable operation of the air valve assembly is ensured, use is convenient, air with different air pressures can be flexibly obtained, the use requirement is effectively met, and assembly is convenient.