124 results about "Volumetric efficiency" patented technology

The invention provides an intelligent performance test method and system for a multistage series Roots vapor compressor. The method comprises the following steps: introducing vapor into equipment to be tested as a test medium; the to-be-tested equipment comprises a control unit, multiple stages of Roots vapor compressors connected in series, an interstage spraying device and a parameter detection unit; the opening degree of each valve in the pipeline valve assembly and the spraying water flow of the inter-stage spraying device are cooperatively controlled through the control unit, so that each stage of compressor in the to-be-tested equipment is stabilized at a preset test working condition point; after the to-be-tested equipment operates stably, acquiring steady-state operation data within a preset duration through a parameter detection unit; calculating a performance evaluation index of the to-be-tested equipment by using the steady-state operation data; the performance evaluation indexes comprise isentropic efficiency and / or volume efficiency of the compressor. The invention further provides a test system for implementing the method. According to the invention, through intelligent automatic control, the performance test of the multi-stage compressor is realized.

The invention discloses an operation method and system of a liquid-gas dual-mode liquid hydrogen refueling station, the system realizes the switching of a refueling route through a plurality of liquid hydrogen control valves and a control switch of a gas hydrogen control valve, liquid hydrogen output from a liquid hydrogen storage tank is primarily pressurized through a first liquid hydrogen booster pump, and in the liquid hydrogen refueling route, the liquid hydrogen output from the liquid hydrogen storage tank is pressurized through a second liquid hydrogen booster pump. The liquid hydrogen pressurized for the first time is in a supercooled state and is not easy to evaporate, the generation of BOG is greatly inhibited, the leakage amount of the liquid hydrogen in a liquid-liquid filling process can be reduced, the filling efficiency is improved, in a high-pressure hydrogen filling route, the liquid hydrogen in a supercritical state can also effectively reduce the cavitation problem of a pump during secondary pressurization, waste of liquid hydrogen cold energy is reduced, and the production cost is reduced. High volume efficiency can be effectively guaranteed, and durability of equipment and efficient operation of the hydrogen refueling station are guaranteed.

This invention provides a pump body assembly and a rotary compressor to improve volumetric efficiency and reduce exhaust noise. The pump body assembly includes: a front-stage cylinder with a first exhaust port; a rear-stage cylinder with a first intake port; a connecting component having a connecting channel; one end of the connecting channel communicating with the first exhaust port and the other end communicating with the first intake port; and a first movable component disposed within the connecting channel. The first movable component includes a first movable member movably disposed along the axial direction of the connecting channel, allowing the connecting channel to have a connected state and a disconnected state, thereby connecting or disconnecting the first exhaust port and the first intake port.

The application discloses a high-end equipment pump motor high-fidelity state evaluation method, comprising the following steps: sequentially constructing an ideal mathematical model, an internal leakage amount mechanism model and an actual output torque calculation model, obtaining theoretical performance parameters, dynamic volumetric efficiency and torque benchmarks; based on health state test data, adopting a multi-objective optimization algorithm to inverse model undetermined parameters, and establishing an individualized health benchmark model; inputting real-time performance signals into the model, calculating the residual error of measured data and model response, extracting a dimensionless health feature vector through normalization processing, obtaining a comprehensive health index through weighted fusion, and realizing precise quantitative evaluation of the health state of the pump motor.

The utility model discloses a compressor volumetric efficiency testing device based on an air medium, and relates to the technical field of compressor performance detection. The device comprises a first gas storage tank, a motor, a belt pulley group, a first pressure reducing valve, a second pressure reducing valve, a third pressure reducing valve, an oil storage tank, a second gas storage tank, a third gas storage tank, a first oil-water separator, a second oil-water separator and a support frame, according to the utility model, through the combination of the first gas storage tank, the motor, the belt pulley set, the first pressure reducing valve, the second pressure reducing valve, the third pressure reducing valve, the oil storage tank, the second gas storage tank, the third gas storage tank, the first oil-water separator and the second oil-water separator, the equipment is simplified, the cost is reduced, and complicated parts such as a condenser, an evaporator and an expansion valve are not needed; equipment design and manufacturing cost is reduced, operation is simple, precision is higher, air media have no phase change problem, the testing process is simple, data are more stable, and measuring precision is higher.

The application provides a compressor back pressure adjusting structure and a compressor. The compressor back pressure adjusting structure comprises a support for supporting a compression assembly of the compressor; a main body arranged on the support, wherein a gas flow discharged by the compression assembly can at least partially flow between the main body and the support and push the support to rotate; and a plurality of first channels with different flow areas are arranged on the main body, wherein the first channels have first ends and second ends, the first ends are open towards the compression assembly, and the second ends are arranged on the outer wall of the main body, and the gas flow between the main body and the support flows into one of the first channels through the second end and is discharged from the first end. According to the application, the defect that the back pressure of the compressor cannot be adjusted in the prior art, which leads to poor stability of the compressor in operation, can be overcome, and the volumetric efficiency of the compressor can be effectively improved and the power consumption of the compressor can be reduced.

The invention relates to the technical field of agricultural machinery, in particular to a crawler belt straight movement keeping hydraulic system, a control method and agricultural machinery. In the hydraulic system, a left track closed pump is connected with a left track walking motor through a left flow regulating valve group, and a right track closed pump is connected with a right track walking motor through a right flow regulating valve group; the left flow regulating valve group and the right flow regulating valve group respectively comprise a proportional valve and a constant pressure difference pressure reducing valve, the inlet and outlet pressure difference of the proportional valve is kept at a preset value through the constant pressure difference pressure reducing valve, and the flow of hydraulic oil entering the left crawler walking motor and the right crawler walking motor is regulated by changing the current of the proportional valve. The proportional valve and the constant pressure difference pressure reducing valve are adopted for flow control and pressure compensation, and the flow control precision is high, so that the rotating speeds of the walking motors on the left side and the right side can be accurately adjusted, and it is ensured that the rotating speeds of the two walking motors tend to be consistent; closed-loop control is adopted, the actual rotating speed serves as the target, and the influence of the volume efficiency of the closed pump and the travel motor is avoided.

The application discloses an axial flexible sealing scroll compressor, a driving mechanism is in sealing connection with an upper support, the driving mechanism is connected with a moving scroll, a fixed scroll is in sealing connection with a top end surface of the upper support, a back pressure cavity flexible sealing structure and an anti-rotation mechanism are arranged between the moving scroll and the upper support, the fixed scroll is in sealing connection with an upper shell, a pressure leading channel and a pressure releasing channel are arranged in the fixed scroll, a back pressure valve base and a back pressure valve float are arranged in the fixed scroll, the back pressure valve base is in sealing connection with the fixed scroll, and the back pressure valve float is in axial sliding sealing connection with the fixed scroll. The back pressure valve structure is added in the low-pressure area of the fixed scroll to lead pressure, the temperature change of the working area of the back pressure valve is small, the thermal deformation is small, the leakage probability of the back pressure valve is small, and the back pressure floating effect is good; the back pressure valve is arranged in the fixed scroll, and the machining process is simple; and the axial sealing structure driven by the back pressure valve can greatly improve the operation volume efficiency of the compressor.

The application provides a pump body assembly, a compressor and an air conditioner with the same. The pump body assembly comprises a compression structure and a force applying structure. The compression structure comprises a static vortex disc and a dynamic vortex disc which are engaged with each other. The force applying structure applies a pre-tightening force in a first direction to the dynamic vortex disc. The first direction is opposite to the rotating direction of the dynamic vortex disc. According to the pump body assembly, the compressor and the air conditioner with the same, the dynamic and static vortex discs can be more stable in radial action clearance, and the compressor has high volumetric efficiency in a full frequency range.

The utility model discloses a shell, a compressor and a vehicle, the shell comprises a high-pressure part, a low-pressure part and a heat insulation part, the high-pressure part defines a high-pressure cavity, the low-pressure part defines a low-pressure cavity, the heat insulation part is located between the high-pressure part and the low-pressure part, and at least part of the heat insulation part participates in defining the high-pressure cavity; at least in part, the low-pressure chamber is defined to reduce heat transfer between the low-pressure portion and the low-pressure portion. According to the shell, the heat insulation part is arranged between the high-pressure part and the low-pressure part of the shell, heat exchange generated between the high-pressure cavity and the low-pressure cavity through the shell can be reduced, and therefore heat dissipation of high-temperature and high-pressure media in the high-pressure cavity can be reduced, and the temperature adjusting effect and energy efficiency of a compressor are improved; and the influence of high temperature on the low-pressure cavity can be reduced, so that the air inlet volume efficiency is improved, the energy efficiency of the compressor can be improved, the working performance of the compressor is improved, and the service life of the compressor is prolonged.

The application relates to a diaphragm head assembly and a diaphragm compressor. The diaphragm head assembly comprises a cylinder, a guide oil disc, an oil distribution disc, a cylinder cover and a diaphragm. The cylinder is provided with a first channel and a chamber which are connected with each other. The guide oil disc is arranged in the chamber and is opposite to the first channel in the axial direction of the guide oil disc. The guide oil disc is spaced apart from the wall surface of the chamber so that an oil distribution area is defined between the surface of the guide oil disc and the opposite wall surface of the chamber. The oil distribution disc is provided with a first through hole and an oil side diaphragm chamber which are connected with each other. The oil distribution disc is arranged on the side of the guide oil disc which is away from the first channel in the axial direction of the guide oil disc. The oil distribution disc is spaced apart from one side of the guide oil disc. The first through hole is communicated with the oil distribution area. The cylinder cover is connected with the cylinder. The diaphragm head assembly can avoid the center of the diaphragm being first attached to the wall surface of the gas side diaphragm chamber before the edge of the diaphragm, thereby avoiding the problem that the gas in the gas side diaphragm chamber cannot be completely discharged during the compression of the exhaust gas, reducing the clearance volume of the diaphragm compressor and improving the volumetric efficiency of the diaphragm compressor.

The application discloses a high-volume-efficiency combined gear pump and relates to the technical field of gear pumps.The combined gear pump comprises a gear pump shell, a gear pump end cover is connected to the upper end opening of the gear pump shell, a driving cycloid gear shaft is rotationally connected in the gear pump shell, a cycloid gear is arranged on the outer wall of the driving cycloid gear shaft, a driving gear is arranged on the outer side of the cycloid gear, the outer ring teeth of the driving gear are meshed with the outer ring teeth of a driven gear, upper side floating shaft sleeves are arranged at the upper ends of the driving gear and the driven gear, upper side oil pressing holes are arranged on the upper side floating shaft sleeves, lower side floating shaft sleeves are arranged at the lower ends of the driving gear and the driven gear, lower side oil pressing holes are arranged on the lower side floating shaft sleeves, an oil inlet and an oil outlet are arranged on the outer wall of the gear pump shell, a pre-pressing oil channel and a constant-pressure oil channel are arranged on the gear pump end cover, an overflow valve can be arranged between the pre-pressing oil channel and the constant-pressure oil channel, and the meshing and merging positions of the driving gear and the driven gear are communicated with the oil outlet.The combined gear pump has high volume efficiency and small pressure pulse.

Methods and systems for a mechanically driven pump are provided. The pump is for lubrication and comprises: a cam lobe or an eccentric mounted on and driven by a shaft; a piston being in contact with the cam lobe or the eccentric; a spring acting on the piston; an inlet check valve positioned in an inlet port; and an outlet check valve positioned in an outlet port, where the inlet check valve and the outlet check valve do not comprise preload springs and are installed vertically in a normally closed position due to a force of gravity acting on internal balls of the check valves. Orifices fluidly coupled to the inlet check valve and the outlet check valve are position outside the piston stroke to prevent the piston from acting as a guillotine valve, which may increase volumetric efficiency of the mechanically driven pump.

The present invention provides an external gear pump that can suppress a reduction in the volumetric efficiency of the pump even when the liquid being sucked in and discharged is a liquid with low lubricity, such as water. [Solution] The casing 1 includes a main body member 3 that slides against one side of both gears 11 and 12. The main body member 3 divides the sliding contact surface 3A that slides against one side of both gears 11 and 12 into a discharge pressure acting region where the force based on the discharge pressure of the liquid being drawn in and discharged acts in the axial direction away from both gears 11 and 12, and an suction pressure acting region where the suction pressure of the liquid being drawn in and discharged acts. The main body member 3 divides the back surface 3B, which is the back side of the sliding contact surface 3A, into a back discharge pressure acting region 19 where the force based on the discharge pressure of the liquid being drawn in and discharged acts in the axial direction approaching both gears 11 and 12, opposite to the force acting in the discharge pressure acting region. The back discharge pressure acting region 19 is shaped to overlap with the discharge pressure acting region in a plan view, but not overlap with the suction pressure acting region.

The application provides a radial plunger hydraulic device and relates to the technical field of hydraulic transmission. The radial plunger hydraulic device comprises a flow distribution part connected with an eccentric main shaft, the flow distribution part comprises a first high-pressure flow distribution window, a first low-pressure flow distribution window, a second high-pressure flow distribution window, a second low-pressure flow distribution window, a high-pressure oil hole and a low-pressure oil hole; the flow distribution part is adapted to rotate with the eccentric main shaft and is configured to be capable of controlling the first high-pressure flow distribution window and the first low-pressure flow distribution window to be connected with the first control oil path in advance / delayed or controlling the second high-pressure flow distribution window and the second low-pressure flow distribution window to be connected with the second control oil path in advance / delayed, so that the hydraulic control one-way valve is closed when the two-way plug-in valve is opened or the hydraulic control one-way valve is opened when the two-way plug-in valve is closed. Through the scheme, the volumetric efficiency of the radial plunger hydraulic device can be improved and the impact and vibration can be relieved.

The invention relates to the field of air compressors, in particular to a plateau pressurizing air inlet air compressor structure which comprises an external pipe, an air inlet is formed in the right side of the external pipe, an air outlet is formed in the left portion of the external pipe, an outer ring is rotationally installed at the position of the air inlet, an air rod is rotationally arranged on the left side of the outer ring, and a mounting base is rotationally connected to the bottom of the air rod. A plurality of second connecting pieces are connected to the outer edge of the outer ring, first rotating pieces are rotationally connected to the second connecting pieces, second rotating pieces are rotationally connected to the first rotating pieces, ball heads are arranged between the second rotating pieces and the adjacent first rotating pieces, and blades are connected to the inner sides of the second rotating pieces. By arranging the adjustable air inlet mechanism composed of the outer ring, the air rod, the connecting piece set and the blades and combining the Venturi structure and the spiral flow guide plate, accurate manual control over the air inlet amount and efficient pressurization and rectification of air flow are achieved, insufficient air inlet caused by plateau low-density air is effectively compensated, and the air inlet efficiency is improved. And the volume efficiency and the output performance of the air compressor are obviously improved.

The utility model discloses a kind of high-pressure check valve for mud pump, it is related to mud pump technical field.The check valve includes valve cover, valve body, valve core, spring, locating support rod and the like component;Valve cover is equipped with water V mouth using V-shaped camber structure, can avoid medium flow to produce bubble, prevent cavitation erosion;Valve cover is integrally formed by thread connection with valve body, valve core is equipped with valve core structure seal, in combination with the cooperation of valve cover chamfer and valve core arc surface, realize complete sealing;Valve body is equipped with spring groove, locating hole and movement limit step, respectively guarantee spring stability, valve core accurate movement and stroke limit.The utility model solves the problem that existing check valve is easy to wear under high pressure, poor sealing, realizes long time stable work, improves the volumetric efficiency and reliability of mud pump, applicable to various high-pressure mud pump.

The utility model discloses a pump body assembly, and discloses a compressor and refrigeration equipment wherein the pump body assembly comprises a crankshaft, a first cylinder, a second cylinder and a clapboard assembly, the eccentricity of a first eccentric part is e1, the eccentricity of a second eccentric part is e2, the width of the end face of a first piston is L1, and the width of the end face of a second piston is L2, the height of the first air cylinder is H1, the diameter of the low-pressure compression cavity is D1, the working volume of the first air cylinder is V1, the height of the second air cylinder is H2, the diameter of the high-pressure compression cavity is D2, the working volume of the second air cylinder is V2, the thickness of the first sliding sheet is T1, the thickness of the second sliding sheet is T2, and the specified relation U is met, U = (V2 / V1) * (Di * Li * Ti) / (Hi * ei), i = 1 or i = 2, 1 < = U < = 51, the sealing performance of the low-pressure compression cavity and the high-pressure compression cavity can be improved, and therefore the volume efficiency of the compressor is improved.

The utility model relates to the technical field of sulfuric acid pumps, in particular to an improved cooling and flushing lower bearing of a submerged sulfuric acid pump, which adopts an annular flushing groove without a balance hole design, and utilizes the principle of fluid dynamics to promote pressure difference to be formed at two ends of the flushing groove so as to drive medium fluid to flow directionally. The lower bearing is provided with a spiral flow guide type water retaining ring which is obliquely distributed at an angle of 45 degrees along the periphery of the bearing to effectively restrain the motion trail of flushing water flow, a balance hole is omitted, a lower bearing flushing groove is redesigned, liquid flows through the lower bearing to achieve flushing and cooling, and the problem of abrasion is solved. The new design change is small, the cost is not increased, the size of the auxiliary sealing ring is not changed, the pressure of the balance chamber is increased, leakage is reduced, the volume efficiency is improved, and the pump efficiency is improved by 0.5%-1%. The scheme prolongs the service life of the lower bearing and reduces the maintenance and overhaul period of the pump body.

The application relates to the field of fluid machines, in particular to an anti-cavitation centrifugal water pump device based on flow channel optimization and a method thereof; the device comprises a pump shell with a bypass backflow channel, an impeller with a flow guide micro groove, a valve assembly and a controller; the system combines the operation parameters of a main driving motor to solve the stator current variance, so as to evaluate the cavitation impact strength; the core is that when the current variance is greater than a preset safety threshold, a stepping motor is controlled to drive a rotating valve core, and the flow passage sectional area of the bypass backflow channel is dynamically adjusted; the application discards the traditional architecture of deploying sensors in the pump shell, accurately inverts the cavitation degree by using the current variance and dynamically compensates, so that the system hardware architecture and assembly process are simplified, and the continuous volume efficiency loss caused by the fixed large-opening backflow under the non-cavitation stable working condition is effectively avoided.

The invention relates to the technical field of compressors, particularly provides a crankshaft assembly, a compressor and an air conditioner, and aims at solving the problem that an existing compressor is poor in stability. In order to achieve the purpose, the crankshaft body comprises an eccentric part, the eccentric part is connected to the crankshaft body, the eccentric part is of an integrated structure, and the peripheral face of the eccentric part is provided with a grain structure. According to the compressor, the eccentric part is arranged to be of the integrated structure, the volume efficiency of the compressor can be maintained as much as possible in the long-term operation process of the compressor, the stability of the compressor is improved, meanwhile, the friction force between the eccentric part and the air cylinder can be reduced by arranging the line structure on the peripheral face of the eccentric part, and the sealing effect can be achieved; gas leakage in the tangential direction of the eccentric part is reduced, and the compression capacity is improved.

The invention relates to the technical field of air compressor systems, and discloses an energy-saving air inlet system of an air compressor, which comprises the following modules: a traveling wave thermoacoustic refrigeration module for performing passive refrigeration on inlet air by using pressure pulsation energy in a main air inlet pipeline; the acoustic impedance matching and harmonic filtering coupling structure is used for optimizing sound energy transmission between modules and purifying driving sound waves; the self-adaptive Helmholtz resonance pressurization module is provided with variable geometric parameters and is used for realizing pulsating pressurization; and a cooperative control unit. And the cooperative control unit controls variable geometric parameters of the self-adaptive Helmholtz resonance pressurization module according to the real-time operation working condition of the compressor, so that the natural resonance frequency of the self-adaptive Helmholtz resonance pressurization module is dynamically matched with the fundamental frequency of air inlet pulsation. According to the air compressor, cooperative work of air inlet passive refrigeration and all-working-condition self-adaptive resonance pressurization is achieved, and the volume efficiency and the system energy efficiency of the air compressor are remarkably improved.

A kind of micro water hydraulic motor pump driven by roller frame, including micro motor, rotating frame with roller, space cam guide rail, cross yoke and pump core piston, by micro motor shaft input an initial torque, motor shaft passes through cross yoke and transmits torque to roller rotating frame, the roller on rotating frame is under the constraint of space cam guide rail, rotating frame drives pump core piston reciprocating motion, so pump core piston does reciprocating motion and rotation motion;When piston rotates and axially moves, piston groove is communicated with two groups of holes on cylinder body perpendicular to each other respectively, the volume of piston cavity increases or reduces, and the pump realizes suction or discharge function.The micro motor of the present application is directly connected with the cross yoke in the micro pump, the structure is compact, and the volume is small;The piston driving mechanism of micro pump is arranged on one side of the piston, and oil-water separation is realized through sealing element, which improves the service life of hydraulic pump;The pump rotation speed is high, and the volumetric efficiency is high.

The invention discloses an intelligent control system of an internal gear pump. The detection module collects working condition parameters such as meshing clearance, four types of external interference parameters and tooth surface fatigue-lubrication parameters containing acoustic emission signals and metal abrasive particle content in real time. The edge calculation module calculates the volume efficiency based on the meshing clearance and the lubrication state, performs dimensionless weighting on external interference to obtain an interference comprehensive coefficient, and obtains the fatigue damage degree according to acoustic emission, abrasive particles, the clearance and the time length; a full-link energy consumption model with the meshing clearance, the interference comprehensive coefficient and the fatigue damage degree as correction factors is constructed, and real-time energy consumption is calculated; the weight is dynamically adjusted and optimized with the minimum energy consumption as the target to solve the optimal operation parameter, and a cooperative control signal is generated after the PID coefficient is set according to the triple variables with the optimal flow as the given value. The execution module responds to the signal to cooperatively adjust the motor rotating speed, the pipe network valve opening degree and the active lubrication parameters. According to the invention, full-closed-loop intelligent control of mechanical state-external interference-tooth surface fatigue coupling is realized.

An integrated electro-hydraulic unit including an electric machine, a hydraulic machine, and a shared casing. The electric machine includes a winding and a stator. The hydraulic machine includes a shaft, a cylinder block, a plurality of pistons, and a valve plate. The shared casing includes a cooling channel located between the electric machine and the hydraulic machine. By action of the pistons, a first port on the valve plate receives working fluid pulled into the cylinder block and a second port on the valve plate receives working fluid pushed out. By action of the pistons, a third port on the valve plate is configured to receive a cooling flow of the working fluid. The cooling flow through the third port is separate from the first port and the second port, such that volumetric efficiency measured between the first port and the second port is not affected by the cooling flow.

The utility model provides an internal gear pump and an integrated motor pump, the internal gear pump comprises a pump shell, a driving gear, a driven gear ring, a moon-shaped partition plate and a positioning component, the pump shell comprises a shell and a cover plate, the shell and the cover plate define a volume cavity, the driving gear and the driven gear ring are rotatably arranged in the volume cavity, and the moon-shaped partition plate is arranged in the volume cavity. An offset gap is formed between the driving gear and the driven gear ring, the moon-shaped partition plate is arranged in the offset gap and comprises a main plate and an auxiliary plate, the positioning assembly is provided with a positioning pin, in the rotating process of the driving gear, oil pressure in the pump shell enables the main plate to move in the radial direction of the driving gear relative to the auxiliary plate, and one end of the positioning pin is connected to the cover plate. The other end of the positioning pin is used for abutting against the main board so as to limit the maximum moving distance of the main board back to the auxiliary board. According to the utility model, tooth crest gaps can be reduced, liquid leakage is reduced, and the volume efficiency and performance of the pump are obviously improved.

The invention discloses a method for dynamically adjusting the exhaust pressure of a screw air compressor by keeping the air pressure of a terminal unchanged. The method comprises the following steps of: A, calculating the theoretical displacement V < theoretical > per revolution of a rotor according to a formula; b, calculating the volumetric efficiency eta v according to a formula; c, calculating a constant coefficient s according to a formula; d, according to a formula, calculating a pressure difference delta P current generated due to pipeline transmission when the terminal gas flow is changed but the terminal gas pressure is not changed; and E, the exhaust pressure of the screw air compressor is dynamically adjusted to be equal to P terminal + delta P current.

A method for operating a refrigeration system with a heat pump function for a motor vehicle with an at least partially electric drive. The refrigeration system has a refrigerant compressor; a first heat exchanger; at least one further heat exchanger; a sensor device arranged upstream of the refrigerant compressor on the low-pressure side for detecting a first refrigerant pressure and / or a first refrigerant temperature; a sensor device arranged downstream of the refrigerant compressor on the high-pressure side for detecting a second refrigerant pressure and / or a second refrigerant temperature, the method includes detecting the first refrigerant pressure and / or the first refrigerant temperature; detecting the second refrigerant pressure and / or the second refrigerant temperature; detecting a speed of the refrigerant compressor; determining a refrigerant volumetric efficiency; and determining a refrigerant mass flow based on the refrigerant volumetric efficiency.

This invention relates to the field of data processing technology, and discloses a method, apparatus, construction machinery, and medium for determining pump pressure in a hydraulic system. The method includes: when a first pressure detection device corresponding to a target auxiliary pump is detected to be in a fault state, acquiring the output torque of the engine side connected to the hydraulic system and the first input torque corresponding to each of the other auxiliary pumps; calculating the second input torque corresponding to the target auxiliary pump based on the output torque and the first input torque corresponding to each of the other auxiliary pumps; and calculating the current pump pressure of the target auxiliary pump based on the second input torque and the pump displacement and volumetric efficiency corresponding to the target auxiliary pump. This invention provides accurate pressure data for the stable operation of the hydraulic system after the pressure detection device on the target auxiliary pump malfunctions, avoiding safety risks, ensuring the performance stability of the construction machinery, and contributing to extending the service life of the entire construction machinery.

The utility model discloses a groove outer vertical type pumping, including main body pump shell, front cover, install in the top of main body pump shell, impeller subassembly is installed in the inside of front cover, drive shaft, rotates and is installed in the inside of main body pump shell, and its top end extends to the inside of front cover and is connected with impeller subassembly, through the setting of impeller subassembly, the back rib of impeller in impeller subassembly is located in the inside of main body pump shell top reservation space, and this ingenious design effectively reduces the gap between impeller and main body pump shell, in the process of pumping operation, and the gap control makes the liquid leakage amount reduce greatly, and more liquid can be transported according to the predetermined path, thereby the volumetric efficiency of pumping is improved significantly, and because the gap reduces, the friction and abrasion produced between impeller and pump shell by relative movement also reduce accordingly, make the service life of impeller and pump shell be effectively prolonged, and the maintenance cost and replacement frequency of equipment are reduced.