128 results about "Overall efficiency" patented technology

The invention relates to the technical field of air blowers, in particular to an energy-saving air blower for a roasting furnace, which comprises a shell and a driving frame rotationally arranged in the shell, a plurality of impeller blades are arranged on the driving frame, a driving disc is arranged on the driving frame, and a connecting rod assembly is arranged on the driving disc; an air inlet pipe is arranged on the shell; a fixing disc is arranged on the air inlet pipe, an adjusting mechanism is arranged on the fixing disc, the adjusting mechanism comprises a worm gear and a worm, angle adjustment is achieved on impeller blades, the air volume adjusting function is directly integrated in an impeller area, and indirect influences of adjustment of a traditional diffuser on the air volume are avoided; and the self-locking characteristic of the worm gear and the worm is utilized to ensure that the adjusted impeller blade angle does not deviate under the influence of vibration or external force, and the stability is enhanced. And the driving disc can be driven by the adjusting mechanism in the process of rotating along with the driving frame. The purposes of optimizing an airflow path, reducing energy loss and improving the overall efficiency of the air blower are achieved through angle adjustment of the impeller blades.

The invention relates to the technical field of motor cooling, in particular to a cooling control method and device for an oil-cooled motor and a medium. The method comprises the following steps: acquiring a motor working condition; different branch cooling oil spraying strategies are adopted according to different motor working conditions, so that the temperature of the motor is increased to a designed temperature limit value. And branch cooling oil spraying strategies corresponding to different motor working conditions are optimized and obtained by adopting a particle swarm optimization algorithm. The motor can work in the optimal temperature interval, compared with a traditional cooling mode, the average efficiency of the working condition of the motor is improved from 95.21% to 95.64%, the overall efficiency is improved by 0.43%, and then the endurance mileage is improved.

The invention discloses a new energy automobile speed reducer efficiency optimization system based on multi-physics field coupling, and belongs to the technical field of new energy automobiles. The system constructs a structure-heat-fluid multi-physics field intensity coupling simulation model: firstly, the structure-heat model calculates friction heat generated by gear engagement based on a finite element method; then, the heat source is input into a heat-fluid sub-model to calculate a whole machine temperature field and oil stirring loss; the key point is that the temperature field can perform bidirectional feedback to update material attributes, lubricating oil viscosity and thermal deformation in real time, and a high-fidelity coupling solution is obtained through iterative solution. Based on the precise model, the system adopts intelligent optimization methods such as a genetic algorithm to carry out iterative optimization on variables such as gear parameters or lubricating oil viscosity, and outputs a design combination enabling the comprehensive efficiency to be optimal. According to the invention, the strong coupling effect among force-heat-fluid is accurately simulated, the deviation of traditional decoupling analysis is overcome, and the efficiency of the speed reducer and the energy efficiency of the whole vehicle can be systematically improved.

The invention discloses a gas turbine exhaust temperature control method and system, and relates to the technical field of gas turbines.The method comprises the steps that operation data of a gas turbine unit are collected, and the generating efficiency of the unit is calculated in real time; according to the starting condition of IGV temperature control reference correction, whether the unit load triggers IGV temperature control reference correction logic or not is judged; and based on IGV temperature control reference correction logic, the IGV temperature control reference is dynamically adjusted, and the turbine exhaust temperature is controlled. According to the method, the generating efficiency of the unit is calculated in real time and compared with a historical efficiency value, the IGV temperature control reference correction is dynamically adjusted, so that the turbine exhaust temperature is always close to the optimal value within a safe range, the output matching degree of a gas turbine and a steam turbine is improved, and therefore the overall efficiency of the combined cycle unit is improved; and by setting a manual switching mechanism, an operator can disable a correction function at any time, a traditional control mode is recovered, and safe operation of the unit is prevented from being influenced when algorithm abnormity or extreme working conditions occur.

To provide an axial flow turbine which can be improved in the overall efficiency.SOLUTION: An axial flow turbine includes: a turbine shaft; a turbine rotor blade row; and a turbine housing having an exhaust chamber on a downstream side of the turbine rotor blade row. The turbine housing includes a flow guide portion having an inner peripheral-side wall surface forming a diffuser flow path for guiding the working fluid that has passed through the turbine rotor blade row to the gap from an inner wall of the exhaust chamber in a radially outward side. When a minimum distance between a rear edge end and a negative pressure surface of the other adjacent turbine rotor blade is denoted as throat s, a pitch of the plurality of turbine rotor blade is denoted as t, a blade height position at a blade root is 0%, and the blade height position at the blade tip end is 100%, a distribution of throat / pitch ratio in a blade height direction having a throat / pitch ratio at the 25% blade height position is smaller than a line segment between the blade root portion and a center portion in the blade height direction, and a throat / pitch ratio at the 75% blade height position is smaller than a line segment between the center portion and the blade distal end portion.SELECTED DRAWING: Figure 3

The invention provides a flow matching control system and an electric engineering machine, and relates to the technical field of flow matching control. The power source flow matching mode of the existing electric engineering machinery has the problem of insufficient efficiency improvement space. According to the system, the motor efficiency model and the hydraulic pump efficiency model are established, the rotating speed of the motor and the displacement of the hydraulic pump are dynamically adjusted according to the target flow of the system by combining an optimization algorithm and weighting processing, so that the power source keeps high-efficiency operation in real time, and the overall efficiency of the system is improved. The device is suitable for combination of various power sources and hydraulic systems, can be widely applied to the field of electric engineering machinery, and has the advantages of remarkable energy-saving effect and dynamic response.

The invention belongs to the technical field of automation control, and particularly relates to an intelligent cutting control method and system for a PVC foam sheet, and the method comprises the following steps: collecting and preprocessing cutting working condition data, the cutting working condition data including the measurement current of a main shaft motor, the regional temperature in a saw blade protective cover and the current real-time feeding speed; performing moving average filtering on the measurement current to obtain smoothed spindle current; and a thermal viscous resistance index model is constructed, and a thermal viscous resistance index representing the saw blade adhesion risk degree is calculated according to the smoothed main shaft current, the rated working voltage of a system main shaft motor, the real-time feeding speed, the effective cutting sectional area and the area temperature. According to the invention, the phenomenon of serious tooth pasting is eliminated from the source, the smoothness and flatness of the cutting surface of the plate are ensured, the saw blade always works in a proper temperature interval, the service life of a cutter is obviously prolonged, and the overall efficiency of an automatic production line is improved.

The invention discloses an isobaric multi-stage flexible compressed air energy storage system and an operation strategy thereof, relates to the technical field of compressed air energy storage, solves the problems that an air storage device is poor in universality and cannot fundamentally achieve efficient and flexible operation under variable working conditions, and comprises a multi-stage compressor unit, a multi-stage expansion unit and an air storage unit. The multi-stage compressor unit is composed of a first compressor unit, a second compressor unit and a third compressor unit, and the multi-stage expansion unit is composed of a first expansion unit, a second expansion unit and a third expansion unit. Through the isobaric gas storage technology, the non-design working condition caused by the pressure change of the storage tank is eliminated, the compressor and the turbine always work near the optimal pressure ratio, through the multi-machine parallel flexible combination, each device can operate at an efficient point close to the rated power of the device, the low-efficiency problem that a large horse pulls a small trolley in a single large device is avoided, and the working efficiency of the whole device is improved. And the overall efficiency of the system is greatly improved.

The invention provides a gravity energy storage circulation system with stable output, the gravity energy storage circulation system with stable output comprises a transition conversion module and transportation modules, the transportation modules are arranged at two ends of the transition conversion module, and the transition conversion module comprises a constant speed output part, a speed regulation part and a converter. The converter can be connected with the constant-speed output part and / or the speed regulation part, the transportation module comprises a bearing mechanism, and the converter is connected with the bearing mechanism. According to the gravity energy storage circulating system with stable output, continuous and stable power generation can be achieved, loading and unloading of the weight blocks form a continuous event, sudden change of driving force on the bearing mechanism is avoided, the output power is stable, and the fatigue life of a mechanical system is prolonged; the whole system runs continuously and stably, and does not need to stop running under the condition of loading and unloading, so that the continuous running capability and the overall efficiency are improved; loading and unloading of the heavy blocks can be completed synchronously, fluctuation of driving force is further reduced, and stability of the output power of the whole system is guaranteed.

The invention provides a shaft-seal-free pump and a liquid flow dividing and leakage preventing method. The shaft-seal-free pump comprises a pump body, a backflow pipe is arranged on the pump body, an impeller rear opening ring is lengthened or a lengthened sleeve is assembled on the inner side of the rear opening ring, the lengthened sleeve is matched with a pump cover rear end fixing ring to form a tail end gap, and a thread seal or a spiral blade seal is arranged at the tail end gap. And an open hole leading to the suction side or the low-pressure side is formed between the wear ring gap and the tail end gap. Through the static seal at the joint of the flow blocking sleeve and the pump cover, the seal design at the rear opening ring of the impeller and the thread seal or spiral blade seal at the tail end gap formed by matching the lengthening sleeve and the fixing ring at the rear end of the pump cover, liquid leakage is effectively prevented, the working efficiency of the pump is improved, and energy waste is reduced. Through the spiral groove and the liquid backflow system, part of liquid returns to the low-pressure position of the inlet of the pump body through the backflow pipe, recycling of the liquid is achieved, maintaining of pressure balance in the pump is facilitated, and the overall efficiency of the pump is improved.

A gas turbine engine is provided. The gas turbine engine includes: a turbomachine having a compressor section, a combustion section, and a turbine section arranged in serial flow order, the compressor section having a high pressure compressor defining a high pressure compressor exit area (AHPCExit) in square inches; wherein the gas turbine engine defines a redline exhaust gas temperature (EGT) in degrees Celsius, a total sea level static thrust output (FnTotal) in pounds, and a corrected specific thrust, wherein the corrected specific thrust is greater than or equal to 42 and less than or equal to 90, the corrected specific determined as follows: FnTotal×EGT / (AHPCExit2×1000). In some instances, a gas turbine engine also comprises a gearbox efficiency rating and / or an overall efficiency rating.

The invention discloses a pump efficiency correction calculation modeling method, a calculation method, equipment, a storage medium and a product, and the modeling method comprises the steps: building an electro-hydraulic proportioning pump efficiency correction calculation model based on a traditional hydraulic pump total efficiency theoretical calculation formula; experimental measurement values of the total efficiency of the electro-hydraulic proportioning pump under different flows are obtained; according to the experimental measurement value of the total efficiency of the electro-hydraulic proportioning pump under each flow, determining the specific value of each correction coefficient under each flow in the efficiency correction calculation model of the electro-hydraulic proportioning pump; obtaining a specific expression of each correction coefficient according to the specific value of each correction coefficient under each flow; and substituting the specific expression of each correction coefficient into the electro-hydraulic proportioning pump efficiency correction calculation model to obtain the electro-hydraulic proportioning pump efficiency correction calculation model. The problem that the error between the calculation result and the experiment result of the traditional hydraulic pump total efficiency theoretical calculation formula is large is effectively solved.

The invention discloses a rapid fine regulation and control method and system for improving the efficiency level of a gas extraction pump, and relates to the technical field of gas extraction. Comprising the following steps: analyzing and constructing an efficiency evaluation coupling relational expression between the comprehensive efficiency and state parameters of the gas extraction pump; and the theoretical optimal liquid supply flow under the current working condition is determined, the maximum adjustment difference between the theoretical optimal liquid supply flow and the actual optimal liquid supply flow is calculated, and the liquid supply flow regulation and control interval is determined. The adjustment is carried out by taking the interval minimum value as the start and combining the initial adjustment step pitch of the set liquid supply flow according to the following logics: if the positive income is generated after the adjustment, the adjustment is continued based on the current step pitch until the scaling condition is met, and the adjustment is continued after the step pitch is scaled; and if no forward earnings exist, zooming the step pitch and adjusting the step pitch to the minimum step pitch, and finally taking the parameter for generating the forward earnings last time as a regulation and control target. According to the method, the gas extraction efficiency and the precision and flexibility of energy consumption optimization are improved.

The disclosure relates to the technical field of blow dryers, and in particular to a compact continuous high-speed blow dryer. By improving optimized design of an air duct, while a wind resistance coefficient of guide vanes is reduced, values of flow rates in paths can be ensured, so that a fluid can be led out of the air duct linearly and uniformly and a fan blade can operate stably. Auxiliary support structures such as a spring, bearings and an air guide pad further stabilize a position of the fan blade and avoid centrifugal vibration of the fan blade, which eventually reacts on a rotating shaft and affects rotational efficiency of the rotating shaft. Therefore, an operating environment of the fan blade is greatly improved, and overall efficiency of the fan is improved, Moreover, since the operating environment of the fan blade is optimized, stability of the fan is enhanced, and further, service life of the fan is prolonged.

The utility model belongs to the technical field of shaft production, and particularly relates to a regrinding device for shaft production, which comprises a shaft material body, and further comprises a chassis, a guide rod, a tailstock, a spring, a mounting frame, a clamping groove and a grinding plate which are arranged on one side of the shaft material body, the chassis is arranged on one side of the shaft material body, and the chassis is further connected with the surface of the guide rod in a sliding manner; according to the device, through the arrangement type combined structure of the grinding plates, assembling can be conducted according to shaft material bodies of different lengths, efficient regrinding work can be conducted on the surfaces of the shaft material bodies through the grinding plates, the time needed by regrinding can be greatly shortened, the working efficiency is improved, and the device is suitable for popularization and application. And when the grinding plate is disassembled and assembled, the purpose can be achieved only by sliding the grinding plate and the mounting frame, and the overall efficiency of regrinding is further improved.

A method of controlling a pumping stage of a fracturing fleet at a wellsite with at least two electric frac pumps to increase the efficiency of the electric frac pumps comprises communicating an interim flowrate to the electric frac pumps and calculating an efficiency value from measured power from the VFD and measured flow rate, intake pressure, and discharge pressure. The method can increase a total efficiency of the fracturing fleet above a threshold efficiency value by iterating the interim setpoint from a first interim setpoint to a second interim setpoint for the electric frac pumps, wherein the second interim setpoint decreases the flowrate to the less efficient electric frac pumps and increases the flowrate an equal amount to the more efficient electric frac pumps.

The utility model relates to the technical field of denitration provides a kind of booster fan for denitration, including base, the top of base is provided with machine shell, the side of machine shell is provided with motor, the side of machine shell away from motor is provided with air intake, the end of air intake away from motor is provided with air intake pipe, the end of air intake pipe away from air intake is provided with clamping pipe, the side wall of clamping pipe is symmetrically provided with link component, the side wall of link component is provided with second recess, the inside of second recess is provided with clamping shaft, clamping shaft is provided with buckle;By moving the buckle designed on clamping pipe, make it and the first recess on the side wall of air intake pipe disengage tight engagement state, it can easily realize the steady and rapid separation of clamping pipe and air intake pipe, this design simplifies the disassembly process, improves the overall efficiency of maintenance work, ensures that booster fan can be completed in shorter time overhaul, quickly restore efficient operation, effectively reduce downtime, provide strong guarantee for the continuous and stable operation of equipment.

The application discloses a compressor, which comprises a cylinder, a moving blade, a variable-diameter ring and an adjusting assembly. An inner wall surface of the cylinder is provided with an annular groove. The moving blade is rotatably arranged in the cylinder. The variable-diameter ring is arranged in the annular groove. The variable-diameter ring comprises a plurality of adjusting members and an elastic sealing member. The adjusting members are arranged at intervals along the circumference of the cylinder. One end of the elastic sealing member is connected with one of the two adjacent adjusting members, and the other end of the elastic sealing member is connected with the other of the two adjacent adjusting members. The variable-diameter ring is arranged opposite to the blade tip of the moving blade and has a gap. The adjusting assembly is used for adjusting the position of the adjusting members in the radial direction of the cylinder, so as to change the gap size between the variable-diameter ring and the blade tip of the moving blade. The application guarantees the wear compensation during the operation of the compressor, avoids the defect that the traditional abradable coating cannot be recovered, and improves the overall efficiency and reliability of the gas turbine.

The invention discloses automatic shaft pressing equipment which comprises a rack, and a supporting table used for placing and fixing an actuator shell and an automatic feeding mechanism located above the supporting table and used for continuously conveying a steel shaft to a set position above the actuator shell are installed on the rack. And the pressing cylinder mechanism is used for pressing the steel shaft into the actuator shell for fixing. Automatic shaft pressing equipment is innovatively designed according to the steel shaft assembling scene of the actuator, the operation of automatically feeding small steel shafts and accurately inserting the small steel shafts into the set positions on the inner side of an actuator shell is achieved, reliable press fitting and fixing are achieved through mechanical force, a traditional tedious and time-consuming manual adjusting mode is replaced, and the production efficiency is improved. Therefore, the safety and the accuracy of operation are remarkably improved, the overall efficiency of a production line is greatly improved, the investment of human resources is reduced, and the consistency of batch quality of products can be improved.

The application provides a winter anti-freezing device for a wet cooling tower and a control method thereof, relates to the technical field of cooling towers, and comprises a bypass pipe connected with a tower pipe on a main pipe, a bypass shutoff valve and a bypass flow adjusting valve arranged on the bypass pipe along the water flow direction, and a double-ring distribution pipe assembly connected with a water outlet end of the bypass pipe; a louver assembly is arranged in the circumferential direction at the air inlet of the cooling tower, a driving mechanism is arranged on the louver assembly, and a thermometer is arranged at the louver assembly; the control method comprises the following steps: a controller collects real-time operation parameters, determines the current operation condition according to the parameters, controls the valves, and distributes the main pipe and the bypass flow of the circulating water; and the opening degree of the louver assembly is controlled through the driving mechanism; the problems of poor anti-freezing effect of the wind shield, the lack of automatic adjusting capacity, flexible control, the reduction of unit back pressure, the reduction of cold end loss, the improvement of the overall efficiency of a thermal power generation enterprise, the adaptation to the flexibility requirement of the unit, and the technical effect of preventing the wet cooling tower from freezing are solved.

The utility model relates to the technical field of mining production, in particular to a three-way air door for non-coal mine mining, and aims to solve the problems that in the drift mining process of a non-coal mine at present, the overall dispatching efficiency of mining is greatly influenced due to the fact that the three-way air door which is generally adopted is limited in ventilation capacity, short in drift length and large in drift number. An air door on one side of the three-way air door is connected with an exhaust fan through a hard air duct, two air doors on the other side of the three-way air door are connected into two mechanical mining access paths through hard air ducts respectively, ventilation air paths of the three-way air door are switched in real time through movement of the air blocking door, alternate ventilation and dust removal of the two access paths are achieved, the length of the access paths can be increased, and the service life of the three-way air door is prolonged. And the wind blocking door is driven by external power to rotate and displace under the action of the movable screw rod, so that in the long-route mechanical mining process, the machine retreating distance during equipment transition is effectively shortened, and the overall mining efficiency and management scientificity are further improved.

The invention discloses a method, device and equipment for determining the double-pump displacement of an electric drive system and a storage medium, and belongs to the technical field of electric drive system control. The method comprises the steps that a first mapping relation between time and total required flow under a preset working condition is determined, and the total flow comprises cooling liquid required flow and lubricating liquid required flow; according to the first mapping relation, the first maximum rotating speed of the first oil pump and the second maximum rotating speed of the second oil pump, multiple target displacement combinations of the first oil pump and the second oil pump are determined; according to a second mapping relation among the flow, the pressure and the total efficiency of the first oil pump and a third mapping relation among the flow, the pressure and the total efficiency of the second oil pump, the power consumption of each group of target displacement combination is determined; and the target displacement combination with the minimum power consumption is determined as the displacement of the first oil pump and the second oil pump. According to the scheme, the optimal displacement combination of the two oil pumps can be designed, and then the power consumption of the electric drive system with the double pumps is reduced.

The present application belongs to the technical field of aviation turbine engine, and discloses an intercooling regenerative water enhanced turbofan engine, which comprises a Brayton cycle and a supercritical water vapor Rankine cycle in a main flow path, the two cycles are closely related, and are coupled by increasing a steam turbine, a steam generator and a condenser. The steam turbine does work to supply a high-pressure compressor, and liquid water appears at the steam turbine outlet, the liquid water is injected into the high-low pressure compressor for intercooling, the intermediate temperature of the compressor is reduced, the power consumption of the compressor is reduced, the unit working medium thrust is improved, the intercooler is saved, and the application is facilitated, the low-temperature steam at the steam turbine outlet can be injected into the low-pressure turbine inlet for cooling, and the cold air amount can be effectively reduced and the unit working medium thrust can be improved. The present application effectively overcomes the high temperature difference and large loss of the steam generator, compared with the conventional aviation engine, the total efficiency of the engine can be greatly improved, the fuel consumption rate and the pollutant emission are reduced.

The invention discloses an automatic press fitting device and method for a gear pump shaft sleeve, and relates to the technical field of shaft sleeve press fitting. The automatic press-fitting device and method for the gear pump shaft sleeve comprise a press-fitting machine body and a pressing plate installed on the press-fitting machine body and driven by a hydraulic unit, and a feeding assembly used for feeding the shaft sleeve and a rotating shaft, a moving assembly driving the rotating shaft to move and an adjusting assembly changing the concentricity rate of the shaft sleeve and the rotating shaft are arranged in the press-fitting machine body. The moving assembly comprises a power push rod which is fixed in the pressing machine body and provides power for the movement of the rotating shaft; the sliding seat is arranged in the pressing machine body in a sliding manner and drives the rotating shaft to move under the driving of the power push rod; therefore, the overall efficiency of a production line is remarkably improved, high consistency can be kept in each operation, accurate alignment of the shaft sleeve and the rotating shaft is ensured, and the assembly quality of each product is guaranteed.

The utility model discloses a ferrite steel drop hammer impact test's feeding device, including base, the upper end of base is installed hammer drop testing machine, a plurality of sample anvil are fixed with in the bottom of hammer drop testing machine, one side of base is installed two support rods, the upper end one side of support rod is rotatably connected with the cylinder, the piston rod end of two cylinders rotatably connected with the bearing plate in common, the bearing plate is fixed with the feeding frame, four stoppers are installed on the feeding frame with equal interval, and two stoppers are a group, and two groups of stoppers are staggered arrangement. Compared with traditional manual feeding mode, the automatic feeding reduces the link of manual intervention, greatly shortens the feeding time, improves the overall efficiency of test, in addition can satisfy the feeding demand of various types of sample, improves the versatility and applicability of feeding device, can also effectively avoid the damage to feeding frame due to the operation mistake, guarantees the safety of equipment and operating personnel.

The utility model relates to the technical field of water conservancy projects, and discloses a water conservancy project pipeline mounting and supporting device which is provided with an expansion mechanism and a fixing mechanism, the expansion mechanism is used for increasing the contact area with a pipeline, and the fixing mechanism is used for fixing the pipeline, so that the problem that in the current water conservancy project practice, the pipeline cannot be fixed easily is solved. In the prior art, a universal supporting device specially designed for supporting installation of pipelines with different sizes and lengths is lacked, so that in the actual construction process, when the pipelines with various specifications face, temporary building or customization solutions are often needed, the construction difficulty and cost are increased, and the construction period is shortened. In the prior art, the overall efficiency and safety of a project are affected, a traditional pipeline installation method generally can only adapt to pipelines with specific sizes, and additional time and resources are needed to adjust an existing supporting structure once the size or length of the pipelines exceeding an expected range is met.

The invention discloses an arc-shaped bent plate passive control device for reducing the damage of a flow field to a submarine cable. The device comprises a set of front bent plates and a set of rear bent plates, the front bent plates and the rear bent plates are installed on a pipeline in a segmented mode, the front bent plates are installed in the direction, right facing the incoming flow, of the pipeline, the rear bent plates are installed in the direction, back to the incoming flow, of the pipeline, and the center positions of the front bent plates and the center positions of the rear bent plates are kept consistent with a horizontal shaft. The front bent plate and the rear bent plate are symmetrical about the horizontal axis. The arc-shaped bent plate is installed outside the pipeline, the fluid streaming path can be effectively changed, then the resistance and lifting force effects of fluid on the pipeline are reduced, and through application of the arc-shaped bent plate, the overall efficiency of a pipeline system can be improved. Particularly in a uniform flow field, the device can remarkably reduce pressure and friction force borne by the surface of the pipeline, vibration and fatigue of the pipeline are reduced, and therefore the service life of the pipeline is prolonged.

The application aims to provide a compressor aerodynamic performance analysis method, an analysis system and a medium. The compressor aerodynamic performance analysis method comprises the following steps: obtaining a design value of the overall efficiency of the compressor; obtaining an over-limit value and a design value of the tip clearance of the rotor blade of any specified stage of the compressor; obtaining an efficiency difference value when the tip clearance is the over-limit value and the design value; calculating a third efficiency value when the tip clearance is the design value, so that the actual efficiency is equal to the difference between the third efficiency value and the efficiency difference value, and recording the outlet temperature calculation amount; obtaining the compressor outlet temperature calculation amount according to the outlet temperature calculation amount; and obtaining the actual overall efficiency of the compressor when the tip clearance of the rotor blade of the specified stage is the over-limit value according to the compressor outlet temperature calculation amount. The compressor aerodynamic performance analysis method can improve the efficiency and accuracy of analyzing the influence of the tip clearance change of the multistage axial flow compressor on the performance.

The invention discloses a feeding mechanism in the round steel straightening production process and a positioning method of the feeding mechanism, and relates to the technical field of straightening workpiece conveying, the feeding mechanism comprises a first vertical plate, a bottom connecting rod and a second vertical plate, the two ends of the bottom connecting rod are fixedly connected with the first vertical plate and the second vertical plate respectively, and the second vertical plate is fixedly connected to a straightening machine; a collaborative feeding chain is formed through the material storage slope, the follow-up feeding assembly and the crank rocker feeding assembly, full-automatic and continuous operation of round steel can be achieved in all stages of arrangement, material taking, transferring and pushing, the follow-up feeding assembly and a crank rocker mechanism have a mechanical linkage relation, the mechanical linkage relation between the follow-up feeding assembly and the crank rocker mechanism is achieved, and therefore the round steel can be automatically and continuously conveyed. The synchronous action can be realized after the driving motor drives the reduction gear, so that the next round steel can be automatically extracted in each material pushing cycle, the stability and efficiency of the feeding rhythm are improved, pause and non-uniformity caused by manual intervention are avoided, and the overall efficiency of straightening production is obviously improved.

The utility model discloses a large single-stage shield pump with a balance disc structure. The large single-stage shield pump comprises a front balance disc mechanism, a motor high-pressure outer circulation structure and a main shaft. According to the large-scale single-stage shield pump with the balance disc structure, a medium in a high-pressure area reaches the front of the balance disc through the gap between the impeller and the balance plate, pushes away the balance disc and then flows to the inlet direction, the force for pushing the balance disc is counteracted with the axial force generated by the pump, and the effect of completely balancing the axial force is achieved. The whole structure does not have a fine machining size or sensitive gap which is particularly accurate, so that various high-risk media which are highly corrosive or contain trace particles can be easily handled; due to the pressurization effect of the auxiliary impeller, a flow outlet of motor circulation can be selected as a pump body outlet, the possibility of cavitation is avoided, the motor circulation flow is converged into the outlet flow, the motor circulation flow is reasonably utilized, and the overall efficiency of the pump is improved.