919 results about "Centrifugal compressor" patented technology

The embodiment of the invention provides a centrifugal compressor performance data determination method and a centrifugal compressor performance optimization method, and belongs to the technical field of centrifugal compressors. The method comprises the steps that the inlet guide vane opening degree and the compressor rotating speed are combined to obtain an operation mode combination; grouping the original compressor operation parameters based on the operation mode combination to obtain grouped operation parameters, wherein the grouped operation parameters comprise evaporator parameters, condenser parameters, refrigerating capacity of a refrigerating machine and unit operation efficiency parameters; calculating a flow coefficient and a pressure ratio of a compressor according to evaporator parameters, condenser parameters and refrigerating capacity of a refrigerator; the isentropic compression efficiency of the compressor is calculated according to the condenser parameters; calculating the isentropic compression efficiency of the compressor unit based on the unit operation efficiency parameter and the isentropic compression efficiency of the compressor; and constructing a performance curve based on the compressor flow coefficient, the pressure ratio, the compressor isentropic compression efficiency and the compressor unit isentropic compression efficiency. According to the embodiment of the invention, the performance data of the centrifugal compressor can be accurately obtained, and the accuracy of performance optimization is improved.

According to the centrifugal compressor, a motor cavity is defined by a shell, and a plurality of pressing wheels are arranged at the two ends of a rotor shaft respectively; in the height direction of the centrifugal compressor, the first medium inlet is located in the lower end of the shell, the second medium inlet is located in the upper end of the shell, the medium outlet is located between the first medium inlet and the second medium inlet, and the first medium inlet, the second medium inlet and the medium outlet all communicate with the motor cavity. Therefore, the multiple pressing wheels are arranged at the two ends of the rotor shaft correspondingly, staged compression of gas can be achieved, the centrifugal compressor can achieve the higher pressure ratio, and the operation efficiency of the centrifugal compressor is improved; according to the centrifugal compressor, the first medium inlet is located in the lower end of the shell, the second medium inlet is located in the upper end of the shell, and the medium outlet is located between the first medium inlet and the second medium inlet, so that the flowing-in and flowing-out positions and the flowing speed of media are reasonable, the cooling effect of the centrifugal compressor can be remarkably improved, and the working performance of the centrifugal compressor is improved.

A centrifugal compressor includes a rotary shaft, an electric motor, an impeller, a thrust bearing, and a housing having a passage that includes a motor cooling passage and a bearing cooling passage. The housing includes an inner housing and an outer housing. The motor cooling passage is defined by the inner housing and the outer housing. The passage includes a branching passage through which cooling fluid is divided and flows into the motor cooling passage and the bearing cooling passage and a joining passage through which the cooling fluid flowing through the bearing cooling passage joins the cooling fluid flowing through the motor cooling passage. The motor cooling passage includes a guide wall that guides the cooling fluid flowing through the motor cooling passage.

The invention discloses an energy-saving type magnetic suspension centrifugal water chilling unit, and relates to the technical field of refrigeration, the energy-saving type magnetic suspension centrifugal water chilling unit comprises a magnetic suspension compressor, a variable-diameter throttling mechanism and a heat exchange system, the heat exchange system is fixedly installed on the side face of the outer wall of the magnetic suspension compressor, and the variable-diameter throttling mechanism is fixedly installed on the side face of the outer wall of the heat exchange system; an outlet of the magnetic suspension compressor is directly connected with the heat exchange system through a pipeline, and the reducing throttling mechanism is connected with the heat exchange system through a pipeline. The front-stage closed impeller and the rear-stage semi-open impeller are coaxially connected in series, efficient compression without mechanical contact and oil lubrication is achieved, the problems that a centrifugal compressor is high in energy consumption and large in vibration due to mechanical friction are solved, and the energy efficiency ratio of a unit is effectively increased.

The utility model discloses a heat management system based on an air floatation centrifugal compressor and a machine room. The heat management system comprises the air floatation centrifugal compressor, an evaporator, a condenser and a throttling element. An air inlet of the air flotation centrifugal compressor communicates with an outlet of the evaporator, a liquid cooling module is arranged in the air flotation centrifugal compressor to cool a motor of the air flotation centrifugal compressor, an inlet of the liquid cooling module is connected to an outlet of the condenser through a first control valve, and an outlet of the liquid cooling module is connected to an inlet of the evaporator. The evaporator is arranged at the to-be-cooled device to absorb heat emitted by the to-be-cooled device. An inlet of the condenser communicates with an exhaust port of the air flotation centrifugal compressor, and the throttling element is arranged at an inlet of the evaporator and used for conducting throttling expansion on the cooled refrigerant. The heat management system is applied to the machine room, an oil separator and corresponding pipelines are omitted, the overall structure is simple, and meanwhile the heat dissipation efficiency can be improved.

The centrifugal compressor provided by the application comprises an impeller, a diffuser and a backflow device. The diffuser comprises a cover plate and a partition plate. The cover plate is installed on the backflow device and forms a containing cavity with the backflow device. The partition plate is accommodated in the containing cavity and divides the containing cavity into a supply air passage communicated with an air inlet. The supply air passage comprises a diffuser passage, a reversing passage and a backflow passage. The reversing passage has opposite first and second side walls. The first side wall is arranged on the inner side wall of the cover plate, and the second side wall is arranged on the outer side wall of the partition plate. The first side wall comprises a first arc surface, a second arc surface and a first plane arranged between the first arc surface and the second arc surface. The second side wall comprises a third arc surface and a fourth arc surface. According to the scheme, the gas in the diffuser passage is smoothly transitioned into the backflow passage, and the loss of gas flow from the diffuser passage into the backflow passage is avoided.

The invention discloses a centrifugal compressor assembly error modeling method integrating manufacturing error and assembly deformation, which comprises the following specific steps: S1, measuring an assembly surface by adopting line laser and a three-coordinate measuring machine, assembling surface point clouds of all assembling parts of the centrifugal impeller of the centrifugal compressor are obtained through feature extraction, a surface model of the assembling parts in interference fit with the centrifugal impeller is reconstructed based on an NURBS curved surface modeling method, and deformation calculation of interference fit of the centrifugal impeller is conducted; s2, calculating a matching error of the assembly surface of each assembly part by adopting a point cloud constraint registration method; and S3, based on the assembly constraint relation between the matching surfaces and the improved Jacobian-spinor model, a centrifugal compressor centrifugal impeller assembly chain error transfer model is established. The method has the advantages that the problem that error sources are not comprehensively considered in the actual assembly process is solved, the constraint relation between assembly surface matching errors is considered, and the assembly chain error transmission model is constructed and used for improving the assembly error prediction precision.

The invention discloses a multistage closed-loop recovery method and system for industrial flue gas waste heat, and particularly relates to the technical field of waste heat recovery. The method comprises the following steps: predicting a process steam demand through a high-temperature section temperature parameter in flue gas monitoring data, and predicting a preheating medium demand based on a low-temperature section temperature parameter in the flue gas monitoring data; inputting the high-temperature-section demand prediction result and the low-temperature-section demand prediction result into a dynamic heat balance equation, calculating an optimized set point of a three-stage compressor unit, and adjusting the rotating speeds of a centrifugal compressor, a screw compressor and a scroll compressor by adopting a fuzzy PID (Proportion Integration Differentiation) algorithm; collecting temperature and flow data of secondary waste heat after the industrial equipment is reused, and generating secondary waste heat monitoring data; according to a compressor adjusting instruction and secondary waste heat monitoring data, the real-time opening degrees of the two-way stop valve and the electric adjusting valve are controlled, backflow of secondary waste heat to the interstage heat exchanger set is achieved, closed-loop recycling of industrial flue gas waste heat is completed through countercurrent flow heat exchange, and the waste heat recycling efficiency and the system stability are improved.

According to the equipment and the method, hydrogen is pre-cooled with a mechanical low-temperature pre-cooling cycle and a helium cycle through a first-stage heat exchanger, is subjected to ortho-secondary conversion through a second heat exchanger, a fourth heat exchanger and a fifth heat exchanger, and is subjected to heat exchange with cold helium discharged from a first turbo expander in the helium cycle; and liquid hydrogen generated after the liquid hydrogen enters the liquid hydrogen throttling valve to be throttled enters the liquid storage tank, and the hydrogen liquefaction process is completed. Helium entering and exiting the helium circulation low-temperature compressor unit is subjected to mechanical low-temperature precooling, the compression work is reduced through helium low-temperature compression, the expansion work is recycled through the turbo expander, and the thermodynamic efficiency of the system is improved; the hydrogen liquefying system only depends on the cooling capacity provided by the helium circulating system and the mechanical low-temperature pre-cooling circulating system, hydrogen liquefying can be completed without compression, and the system safety is improved; the helium circulation low-temperature compressor unit and the mechanical low-temperature compressor both adopt oil-free gas suspension centrifugal compressors, so that the problems of oil removal and oil return are avoided, and the reliability is remarkably improved.

The invention relates to a centrifugal compressor PIV speed measurement and analysis method, device and equipment and a medium. The method comprises the following steps: acquiring flow field optical measurement data of the centrifugal compressor through a particle image velocity measurement technology; inputting optical measurement data of the flow field into a deep learning model, and extracting dynamic characteristics of the flow field through a characteristic extraction layer of the deep learning model; reconstructing the dynamic characteristics of the flow field into a three-dimensional flow field velocity vector field by using a velocity vector reconstruction layer in the deep learning model; and generating a velocity measurement analysis result based on the three-dimensional flow field velocity vector field. By adopting the method, the multi-scale dynamic characteristics in the complex three-dimensional rotating flow field of the centrifugal compressor can be effectively captured, high-precision three-dimensional velocity vector reconstruction is realized, and the spatial resolution and robustness of flow field measurement are improved.

A discharge system for bulk tank trailers unloads dry bulk material from a bulk product trailer that is configured to be pulled by a vehicle. The discharge system includes a centrifugal compressor, a drive mechanism and a speed increaser. The centrifugal compressor is configured to deliver compressed air to force the dry bulk material from the bulk product trailer and convey the dry bulk material to a storage tank. The drive mechanism furnished rotational motion to the centrifugal compressor (e.g., via a power take-off of the vehicle). The speed increaser is disposed between the centrifugal compressor and the drive mechanism and is configured to increase the speed of the rotational motion furnished by the drive mechanism to the speed compressor. The drive mechanism may include a hydraulic system configured to drive a liquid product pump for pumping liquid product from a liquid product storage tank trailer pulled by the vehicle.

To provide a centrifugal compressor which can reduce a processing cost while suppressing reduction in efficiency due to power loss while reducing a flow rate of a surge point flow.SOLUTION: In a centrifugal compressor of the present disclosure, a casing includes an inflow passage in which a fluid flows, a discharge passage, and an impeller storing part which stores an impeller and has a facing face forming an outer passage extending in one axial direction from an upstream end of the discharge passage along with a cover. The inflow passage includes a limit point at a position where a center angle of an arc of a chip-side flat face from a reference point toward a downstream side is 30°. The casing includes a circulation passage which communicates a region between a plurality of blades and the inflow passage, and communicates with an end part on one axial direction side of the outer passage. An inlet-side opening on the impeller side of the circulation passage is positioned at a boundary between an upstream end face of the cover and the casing. An outlet-side opening on the inflow passage side of the circulation passage is positioned on an upstream side from the limit point.SELECTED DRAWING: Figure 2

The invention relates to an air suspension high-speed centrifugal compressor applied to the technical field of centrifugal machines, and the air suspension high-speed centrifugal compressor comprises a machine body, a centrifugal rotor, a pneumatic bearing, a magnetic suspension system, an end magnetic disk, a shaft magnet, a brake magnet, a magnetic core, an arc rail groove, a brake module and a steering rib. Vector electromagnetic phase modulation is adopted by the electromagnet, active damping control and gyroscopic effect compensation of the centrifugal rotor are achieved through magnetic field vector synthesis, the centrifugal rotor is accelerated and decelerated through magnetic force, the critical rotation speed acceleration time and deceleration time of the centrifugal rotor are effectively shortened, and the hybrid magnetic locking technology is adopted in the shutdown stage of the centrifugal machine. When the centrifugal rotor is static, the brake module is triggered, magnetic pole reversal of the brake magnet is achieved through a reconstruction mechanism generated by the brake magnet, and the centrifugal rotor is in a stable magnetic attraction brake state through the cooperative magnetic attraction effect of the permanent magnet and the brake magnet.

The invention discloses a method for calculating the strength of an end face tooth coupling of an energy storage centrifugal compressor, relates to a method for calculating the strength of an end face tooth coupling, and aims to solve the problem that a method for accurately judging whether the strength of the end face tooth coupling of the compressor is qualified or not by a conventional end face tooth calculation and checking method does not exist at present. The method is implemented according to the following steps that firstly, axial component force generated when the end face teeth transmit torque is obtained; 2, the axial expansion difference of the end face teeth, the main shaft and the screw at the working temperature is calculated, and the actual pre-tightening force of the screw during unit operation is calculated; 3, impeller thrust generated by the front and back pressure difference of the impeller is calculated, the effective tooth surface area of the end face teeth is calculated, and the end face tooth root bending stress, the end face tooth maximum extrusion stress and the end face tooth axial tensioning force safety coefficient of the centrifugal compressor are calculated; and 4, judging the strength of the end face tooth coupling of the energy storage centrifugal compressor. The invention belongs to the field of end face tooth coupling checking.

A centrifugal compressor is described comprising an anti-surge return line is disclosed, wherein a radial expansion impeller is arranged downstream a compressor discharge and one or more flow regulators are arranged between the compressor discharge and the radial expansion impeller, and wherein the radial expansion impeller discharge is connected with the anti-surge return line. A method for controlling surge in a compressor is also described, the method comprising a step of directing at least a portion or volume of the continuous flow of fluid from the compressor to a radial expansion impeller and to a return line.

The invention relates to the technical field of organic solid waste treatment, in particular to a process system for hydrogen production and co-production of biological natural gas from biological crude synthesis gas, which comprises a purification unit, a hydrocarbon regulation unit, an acid removal unit, a methane upgrading unit, a hydrogen recycling and purifying unit and a methane recycling and purifying unit which are connected in sequence. The purification unit is used for removing impurities through pre-impurity removal, compression, dry-process impurity removal and wet-process desulfurization to produce purified synthesis gas and sulfur; the hydrocarbon adjusting unit is pressurized through a centrifugal compressor and adjusts the hydrogen-carbon ratio; the acid removal unit is used for removing acid gas and organic sulfur; the methane upgrading unit is used for converting CO / CO2 into methane through methanation reaction; and the recycling unit purifies hydrogen through pressure swing adsorption and recycles methane by using a membrane separation technology to produce biogas. The problems of low purity and insufficient raw material utilization rate of the traditional process are solved through the circulation process, the co-production of high-purity hydrogen and biogas is realized, and the additional value of resources is improved.

The present application relates to the technical field of compressors, and discloses a centrifugal compressor and a refrigeration device. The centrifugal compressor comprises: a housing, which is provided with a gas inlet and a gas outlet; a centrifugal compression mechanism, which is located in the housing and used for pressurizing a fluid flowing in from the gas inlet and then flowing out of the housing from the gas outlet; a main shaft, which extends in the vertical direction and is arranged in the housing, wherein the main shaft can rotate around the axis thereof; a bearing assembly, which is arranged on the outer side of the main shaft in a sleeving manner; and a centrifugal pump, which is arranged on the outer side of the main shaft in a sleeving manner and can rotate along with the main shaft. The housing defines lubricating channels and an oil cavity, the lubricating channels are communicated with the oil cavity and the bearing assembly, the centrifugal pump is communicated with the oil cavity, and the centrifugal pump can drive oil to circularly flow between the oil cavity and the bearing assembly through the lubricating channels. The coaxial centrifugal pump arranged on the vertical main shaft is used as an oil pump, omitting an oil pump driven by a motor, reducing the power consumption of the oil pump, and improving the efficiency of the compressor.

The invention relates to the field of centrifugal compressors, in particular to a high-pressure centrifugal compressor which comprises a high-pressure centrifugal compressor body, an air inlet pipe and an exhaust pipe are arranged on the high-pressure centrifugal compressor body, the exhaust pipe is connected with an external pipeline through a connecting mechanism, and a detection mechanism is arranged between the exhaust pipe and the external pipeline in a covering mode. Through the synergistic effect of a tensioning assembly (meshing transmission of a gear ring and a gear) of the connecting mechanism and a spring energy storage structure, rapid fastening sealing of the exhaust pipe and an external pipeline can be achieved only by rotating an operation ring, compared with traditional flange connection, bolts do not need to be operated one by one, the assembling efficiency is remarkably improved, meanwhile, a first spring provides continuous axial pressing force, and the assembling efficiency is improved. A connecting gap caused by vibration or temperature change can be dynamically compensated, it is ensured that the sealing ring is in a tight fit state all the time, and the air leakage risk is effectively avoided.

The invention relates to a centrifugal compressor high-altitude environment dynamic simulation test system. The system comprises a compressor test module; the high-altitude environment simulation module comprises an air inlet surge tank, an air inlet assembly and a first air exhaust assembly which are arranged at the upstream of the air inlet pipeline, and an air exhaust surge tank and a second air exhaust assembly which are arranged at the downstream of the air exhaust pipeline; a measurement module; the control module is used for comparing the first actually-measured pressure value with a target altitude pressure value of the air inlet end and controlling the air inlet amount of the air inlet assembly and the air suction amount of the first air suction assembly according to a comparison result, so that the pressure of the air inlet pressure stabilizing tank is stabilized at the target altitude pressure of the air inlet end; and the control module compares the second actually measured pressure value with the target altitude pressure value of the exhaust end, and controls the air suction amount of the second air suction assembly according to the comparison result, so that the pressure of the exhaust surge tank is stabilized at the target altitude pressure value of the exhaust end. It is ensured that test data can truly reflect the actual plateau working condition performance of the gas compressor.

The invention discloses an organic Rankine cycle power generation system driven by exhaust waste heat of a centrifugal compressor, and the system comprises a self-adaptive variable structure waste heat collection module which drives a fin through a stepping motor to adjust a helical angle, matches exhaust temperature fluctuation, and is provided with a double-medium heat exchange loop to realize dynamic storage and release of waste heat; according to the cascade expansion power generation module, two-stage expansion machines are connected in series with a pressure matcher, and a working medium diverter valve is configured to dynamically adjust the working medium proportion; the intelligent coupling power generation and electric energy management module integrates a magnetic resistance switching type permanent magnet synchronous generator technology and a virtual synchronous generator technology and is provided with a dynamic reactive power compensation device; and the multi-parameter cooperative control module optimizes system parameters based on a model prediction control algorithm, and introduces entropy production analysis to monitor irreversible loss. The self-adaptive structure optimizes the heat exchange process, cascade expansion widens the working condition adaptation range, cooperative control reduces irreversible loss, the self-repairing system prolongs the maintenance period, and deep utilization and efficient conversion of waste heat of the centrifugal compressor are achieved.

The invention relates to the technical field of energy storage, and provides a compressed air energy storage power station centrifugal compressor impeller optimization design method and system, and the method comprises the steps: S1, building a centrifugal compressor sample database under various rated conditions; s2, constructing a deep belief neural network model of the centrifugal compressor, training the model by using the sample database, and optimizing model parameters; and S3, giving performance index parameters of the centrifugal compressor to be designed, obtaining optimized structure parameters of the centrifugal compressor by utilizing the trained model, and carrying out modeling and performance verification on the impeller according to the optimized structure parameters. The system comprises a centrifugal compressor sample database unit, a centrifugal compressor deep belief neural network model training unit and an impeller optimization design unit. The method has strong non-linear mapping capability and self-learning capability, and can excavate the non-linear relationship between the structure parameters and the performance parameters of the centrifugal compressor impeller, so that the design parameters of the impeller are optimized more accurately and quickly.

The invention discloses an intelligent load distribution system and method for a centrifugal compressor unit. The system comprises a data sensing module, an intelligent decision-making module, an instruction execution module and a model updating module. The method comprises the steps that operation parameters of multiple parallel centrifugal compressors are synchronously collected in a high-precision mode through an industrial real-time network supporting hardware timestamps, and time-aligned system state observation data are obtained; constructing a state vector based on the data and a load prediction result, inputting a deep reinforcement learning agent fused with compressor physical characteristic constraints, and generating a load distribution instruction and a unit start-stop suggestion; after safety boundary verification is conducted on the original action, the guide vane opening degree is adjusted through a feedforward speed planning and fuzzy self-adaption PID composite servo control algorithm, and starting and stopping operation is executed; meanwhile, empirical data are collected online, and model parameters are periodically and finely adjusted. According to the invention, efficient, safe, accurate and self-evolution compressor group control is realized.

The utility model provides a stand-alone system air suspension frequency conversion centrifugal water chilling unit which comprises a circulation main loop formed by connecting an evaporator, an air suspension centrifugal compressor, a condenser and an economizer through refrigerant pipelines so as to form a refrigeration circulation loop; wherein throttling pipelines are respectively arranged on a refrigerant pipeline between the condenser and the economizer and a refrigerant pipeline between the economizer and the evaporator, so that secondary throttling is carried out on a liquid refrigerant in the refrigerant pipelines; one end of the air supply pipeline is communicated with the economizer, and the other end of the air supply pipeline is communicated with the air suspension centrifugal compressor; the variable-frequency cooling pipeline comprises a frequency converter, one end of the frequency converter is communicated with the condenser through a frequency converter cooling liquid inlet pipeline, and the other end of the frequency converter is communicated with the evaporator through a frequency converter cooling air return pipeline. The unit provided by the utility model can effectively improve the refrigeration efficiency and performance, and reduce the energy consumption and operation cost, thereby realizing the efficient, energy-saving and environment-friendly refrigeration effect.

The invention discloses a magnetic suspension centrifugal heat pump heat recovery system applied to tea beverage making, which comprises a hot water tank, a first heating unit, an extraction hot side, a first cooling unit, a blending water side, a heat recovery pipeline and a high-temperature heat pump unit which are connected in sequence, the high-temperature heat pump unit is provided with a high-temperature heat absorption side, a high-temperature heat release side and a high-temperature magnetic suspension centrifugal compressor, the hot water tank is provided with a water outlet pipeline, and the water outlet pipeline is connected between the first heating unit and the extraction hot side after passing through the second heat exchanger. Hot water obtained after the extraction process is led through the heat recovery pipeline, waste heat of the hot water is recovered through the high-temperature heat pump unit, work is applied through the high-temperature magnetic suspension centrifugal compressor, heat energy generated by the waste heat and work is transmitted to the front end of the extraction process, and meanwhile water in the heat recovery pipeline is subjected to heat absorption cooling or cooling to be used for the blending process. And heat energy recycling is achieved, and the comprehensive energy utilization rate is greatly increased.

A connection passage is formed by a first impeller housing member, a motor housing member, and a second impeller housing member. This prevents, for example, the formation of a gap between a housing and a pipe, which is separate from the housing, in a centrifugal compressor like in a configuration in which a first discharge port and a second suction port are connected to each other by attaching the pipe to the housing. The connection passage is formed only by sequentially overlapping and coupling the first impeller housing member, the motor housing member, and the second impeller housing member with each other in an axial direction of the rotary shaft. This eliminates, for example, the need to provide a structure in the pipe that absorbs the dimensional tolerances that occur between the housing and the pipe when attaching the pipe to the housing.

The invention discloses a centrifugal compressor inlet guide vane deflection angle measuring and adjusting device and method, and mainly solves the technical problems that an existing measuring method is difficult to measure and low in measuring precision and accuracy. The measuring device comprises a base and a measuring assembly. The A surface of the base is provided with a clamping groove for clamping the inlet guide vane, and the B surface is a plane, is used for installing the measuring assembly and is parallel to the vertical split surface of the inlet guide vane; the measuring assembly comprises a main graduated scale, an auxiliary graduated scale and a guide rod; one end of the main graduated scale is vertically mounted on the surface B, and the other end of the main graduated scale is suspended; the auxiliary graduated scale comprises a base and an auxiliary graduated disc, and the auxiliary graduated disc is fixedly mounted on the base; the auxiliary dial is provided with an arc-shaped groove matched with the main graduated scale, and the main graduated scale is clamped in the arc-shaped groove and movably connected with the auxiliary dial. The circle center of the main graduated scale and the circle center of the auxiliary graduated disc coincide and are located on the B surface; the guide rod is connected with the suspended end of the base close to the main graduated scale.

The utility model relates to the technical field of centrifugal refrigeration compressors, in particular to a multistage compression magnetic suspension centrifugal compressor with an independent rotating speed. The compressor comprises a flange plate, a first-stage motor and a second-stage motor, the first-stage motor and the second-stage motor operate independently, the two sides of the flange plate are fixedly connected to one end of the first-stage motor and one end of the second-stage motor, and the first-stage motor and the second-stage motor basically extend in the direction of a first straight line L1; a first-stage impeller and a second-stage impeller are respectively arranged in the first-stage motor and the second-stage motor, and the number of the first-stage impeller and the number of the second-stage impeller are respectively one or a plurality of the first-stage impeller and the second-stage impeller which are connected in series. According to the compressor, adjustment of different rotating speeds of the first-stage motor and the second-stage motor of the compressor can be achieved, adjustment of optimal inter-stage pressure of the compressor under the large pressure ratio is achieved, the optimal isentropic compression efficiency is achieved, and then the energy-saving effect is achieved.

A turbocharger heat management structure relates to the technical field of internal combustion engine supercharging devices and comprises a radial flow turbine, a centrifugal compressor and a bearing system which are connected, and the heat management structure is arranged between the radial flow turbine and the bearing system. The heat management structure comprises a first heat insulation cover, a second heat insulation cover and a third heat insulation cover which are in a revolving body metal sheet shape and arranged at the turbine back disc, a first heat insulation cavity is formed between the first heat insulation cover and the second heat insulation cover, a second heat insulation cavity is formed between the second heat insulation cover and the third heat insulation cover, and a third heat insulation cavity is formed between the third heat insulation cover and the annular cooling groove. The first heat insulation cavity communicates with a gap in the turbine back disc, and the third heat insulation cavity is connected with a cold air hole. The third heat insulation cavity, the second heat insulation cavity and the first heat insulation cavity are sequentially communicated through an air guide structure. On the premise that the weight and the size are not greatly increased, the heat insulation efficiency is greatly improved, and the purpose of actively and efficiently cooling a key area is achieved.

A steam compressor, specifically a multistage centrifugal compressor which could have an operating pressure between 0.2 bar and 12 bar and be used in industrial processes with heat pumps or for the mechanical compression of steam in general.The present invention is to improve the state of the art for steam compressors by means of an optimized architecture that minimizes the manufacturing cost, such that it makes it comparable to that of a fan, without compromising its typical performance.

The invention discloses a carbon dioxide purification system based on multi-stage cryogenic coupling, and relates to the technical field of carbon dioxide purification, the carbon dioxide purification system comprises a pretreatment module, a multi-stage compression cooling module, a cryogenic coupling separation module, an adsorption separation module and an intelligent regulation and control module which are sequentially connected through pipelines; through the synergistic effect of the three-stage centrifugal compressor and vortex tube refrigeration, the carbon dioxide liquefaction efficiency is remarkably improved, meanwhile, the system utilizes the pressure balance valve to dynamically couple gradient temperature control of the cryogenic adsorption tower and the membrane separation assembly, the gas-liquid entrainment problem in the phase change process is effectively solved, and the carbon dioxide liquefaction efficiency is improved. Through cooperation of high-temperature cascade refrigeration and low-temperature vortex refrigeration, gradient temperature control layered adsorption of a cryogenic adsorption tower and dynamic separation of a membrane separation assembly are integrated, the recovery efficiency can be greatly improved, in addition, the system is provided with a multi-physics field sensor array, and operation parameters are dynamically regulated and controlled in combination with an intelligent optimization algorithm of a distributed edge calculation unit, so that the recovery efficiency is improved. And the energy efficiency ratio and the operation stability of the system can be obviously improved.