2073 results about "Volute" patented technology

An aircraft engine, has: a turbine; a scroll case having an inlet connected to a source of combustion gases and an outlet connected to the turbine, and a conduit extending from the inlet to the outlet; a bearing housing including a support flange; an exhaust case downstream of the turbine; and a turbine support case secured to the bearing housing and to the exhaust case, the turbine support case having spokes extending along a direction having an axial component, the spokes extending through the scroll case and radially supported by the bearing housing, a spoke having a distal end secured to the support flange via: one or more fasteners, and a retaining member at the distal end, the retaining member defining an abutment face facing an axial direction and circumferentially overlapping the support flange, a portion of the support flange located axially between the distal end and the abutment face.

The invention discloses a noise reduction method of a bionic fish scale blade centrifugal pump, which comprises the following steps that a long and short blade centrifugal pump is selected for research, and the main design parameters of the long and short blade centrifugal pump are as follows: the specific speed ns is equal to 40.79, the rated flow Qd is equal to 10.6 m < 3 > / h, the lift H is equal to 34m, and the rotating speed n is equal to 2900r / min; a computational domain three-dimensional model of the long and short vane centrifugal pump is established through Creo8.0; in order to prevent backflow of inlet and outlet sections, ensure that fluid stably flows into an impeller and ensure the accuracy of a simulation result, extension pipelines are additionally arranged at an impeller inlet and a volute outlet of the centrifugal pump, the pipe diameter of the inlet extension section is 4 times that of the outlet extension section, and the pipe diameter of the outlet extension section is 8 times that of the inlet extension section; in order to verify the accuracy of a calculation result, a centrifugal pump experiment platform is built for external characteristic experiments; the bionic fish scale pit has the advantages that the dynamic and static interference between the impeller and the volute is reduced, the pressure fluctuation in the pump is stabilized, the amplitude fluctuation of a wave number-frequency spectrum and the energy region of a low wave number region are reduced, the migration of a wave number-frequency spectrum peak ridge is reduced, the curve change is gentle, and then the noise reduction effect is achieved.

The invention discloses a slurry circulating pump state monitoring method and related equipment, and aims to overcome the defects of high false alarm rate and late early warning caused by multi-fault coupling effect and strong background noise interference in the prior art. The method comprises the following steps: synchronously acquiring vibration, acoustic emission, pressure pulsation and temperature signals of a pump volute, an outlet pipeline and a bearing seat; performing wavelet packet decomposition on the acoustic emission signals, extracting features and generating cavitation sensitive factors; a digital twinborn model adapted to fluid-structure coupling simulation and transfer learning is utilized to calculate a deviation value between the monitoring feature and a normal baseline; and when the deviation value exceeds a threshold value, fault identification and life prediction are carried out. Through multi-signal fusion and a dynamic threshold mechanism, a multi-fault coupling effect and strong background noise interference are effectively overcome, and the reliability of a monitoring system is improved.

The invention relates to the field of centrifugal fan industry, in particular to a high-pressure centrifugal fan with a three-dimensional flow impeller, which comprises a volute, the three-dimensional flow impeller and a current collector, the volute is fixedly connected with the current collector, and the three-dimensional flow impeller is arranged in the volute and partially extends into the current collector; the three-dimensional flow impeller comprises a rear disc and a hub, the hub penetrates through the center of the rear disc and is fixedly connected with the rear disc, the rear disc is of a conical structure, and a plurality of blades are arrayed on the rear disc in a surrounding mode. According to the three-dimensional flow fan, the small-size three-dimensional flow impeller is adopted, by increasing the rotating speed of the impeller, it is achieved that the fan in unit volume provides larger gas flow and pressure, the size and weight of the fan are reduced, and the problems that in the prior art, a high-centrifugal fan is generally insufficient in static pressure, low in efficiency and heavy in weight are solved.

The invention provides an analysis method and device for flow, efficiency and water consumption rate of a hydraulic power plant generator set. A distributed flow measurement unit based on a domestic PLC controller and a domestic operating system is constructed, and each unit is independently configured with the flow measurement unit to realize decentralization of data acquisition and processing; active power, guide vane opening, water head difference, instantaneous flow and volute inlet pressure data are collected in real time through a distributed flow measurement unit, and a unit efficiency and water consumption rate calculation model is dynamically fitted based on the data; sending an output result of the calculation model to a monitoring system through an anti-interference communication network, wherein the communication network adopts layered wiring and a double-shielded twisted pair to reduce the signal bit error rate; and the IMC integrated management and control platform is used for remote monitoring and diagnosis of the flow measurement unit, and seamless connection with a smart power plant data medium station is realized. The system reliability and the maintenance flexibility are improved, and the autonomous controllable requirements of domestic substitution and intelligent power plants are comprehensively met.

The utility model provides an air pipe type air conditioner, and relates to the technical field of household appliances. The air pipe type air conditioner comprises a shell provided with an air return opening; the volute assembly is located in the shell and comprises a first volute and a second volute, the first volute is provided with a first connecting part, the second volute is provided with a second connecting part, the first connecting part and the second connecting part are matched and fixed to form a matching part, and the matching part is perpendicular to the plane where the air return opening is located so that the matching part can be disassembled through the air return opening. According to the air pipe type air conditioner, the matching part formed by matching the first connecting part of the first volute and the second connecting part of the second volute is perpendicular to the plane where the air return opening is located, and the second connecting part can be pushed and pulled in the direction perpendicular to the plane where the air return opening is located; therefore, the second volute is installed in the shell or separated out of the shell through the air return opening, the structure is simple, operation is convenient, and the disassembly and assembly efficiency is improved.

The invention provides a wall-mounted indoor unit, an air conditioner and a control method. The wall-mounted indoor unit comprises a shell, a plurality of heat exchangers and a plurality of centrifugal fans are arranged in the shell, a third air opening is formed in the top of the shell, and the heat exchangers are located between the centrifugal fans and the third air opening; the centrifugal fan comprises a volute, the volute is provided with a first air outlet and a second air outlet, an opening of the first air outlet faces the heat exchanger, an opening of the second air outlet is opposite to the heat exchanger, a volute tongue is arranged in the volute, the volute tongue can move in the volute, and the first air outlet and the second air outlet are arranged in the volute. The volute tongue is provided with a first position for sealing the first air outlet and a second position for sealing the second air outlet. According to the air conditioner, the technical problem that in the prior art, a switching structure of an air conditioner with a reversible air supply duct occupies part of the air duct space, and consequently the user experience is poor can be solved.

The invention relates to a compressor and an air compressor system.The compressor comprises a machine shell, an air compressor, an air compressor, an air compressor, an air compressor and an air compressor, the first volute assembly is installed on one side of the machine shell in the axial direction, the first volute assembly is provided with an inner cavity, and a sealing separation part is arranged in the inner cavity; the rotor shaft is rotatably arranged in the accommodating cavity, and part of the rotor shaft is arranged in the inner cavity in a penetrating manner; the first impeller is arranged in the containing cavity and fixedly arranged on the rotor shaft in a sleeving mode. The second impeller is arranged in the containing cavity and fixedly arranged on the rotor shaft in a sleeving mode. Wherein the first impeller and the second impeller are arranged in a back-to-back mode and are in rotary sealing fit with the sealing separation part, the sealing separation part, the first impeller and the second impeller jointly divide the inner cavity into a first compression cavity and a second compression cavity, at least blades of the first impeller are arranged in the first compression cavity, and blades of the second impeller are arranged in the second compression cavity. According to the compressor, the occupied axial space is reduced, and the length of the rotor shaft can be shortened.

The invention discloses a compressor system and a method for realizing stable boundary control of a gas compressor thereof, which can actively adjust parameters B of the system and realize switching of an instability mode of the gas compressor between surging and rotating stall by only depending on an independent, small and adjustable switching section on the premise of not modifying large basic hardware (such as a volute and a pipeline). According to the principle of the compressor system provided by the embodiment of the invention, the effective flow area is changed by adjusting the angle of the turbine guider, so that the stability boundary of an upstream gas compressor or a fan is actively expanded, low-cost and rapid adjustment of the stability of the gas compressor is realized, the research and development efficiency is improved, and the test period is effectively shortened. The compressor system provided by the embodiment of the invention has the characteristic of wide applicability, can be applied to an independent compression system part test environment, and can also be applied to a complex complete machine environment comprising a compression system.

The invention belongs to the field of fluid machinery, and particularly discloses a centrifugal pump volute with a composite noise reduction structure. The centrifugal pump volute comprises a volute body with the base circle radius being R. A volute chamber is formed in the volute body, and a plurality of micro flow deflectors are distributed on the inner side of an inlet of the volute body in the circumferential direction; two sections of semicircular grooves are symmetrically formed in the upstream section of the volute inner wall baffle tongue front and back along the spiral line; two flow guide plates are arranged at a baffle tongue of the volute body, the flow guide plate close to one side of an inlet of the volute body is a front flow guide plate, and a plurality of flow guide holes are formed in the front flow guide plate; a plurality of cavities are uniformly arrayed on the wall surface of the baffle tongue of the volute body; and the bending directions of the micro flow deflectors and the flow deflectors are consistent with the water flowing direction. Inlet flow is optimized through the micro flow deflectors, vortex is restrained through the semicircular grooves, pressure pulsation is reduced through cooperation of the flow deflectors and the cavity structure, the hydraulic performance is kept while fluid noise is effectively reduced, and the comprehensive performance is obviously improved.

The invention relates to the technical field of auxiliary power, in particular to an air supply device of an auxiliary power system. The device comprises an air inlet duct shell, an air inlet air pocket, an air inlet duct outer ring, an air inlet volute, a labyrinth ring, a locking unit and a rotor. The axial end face of the air inlet air pocket is coaxially connected with the air inlet channel shell in an abutting mode. The air inlet channel outer ring comprises an outer sealing cylinder and an outer extending ring which are coaxially and fixedly connected, and the axial end face of the outer extending ring is coaxially connected with the air inlet air pocket in an abutting mode. The air inlet volute comprises a volute positioning cylinder and a spiral air channel shell which are fixedly connected, and the end face of the air inlet volute coaxially abuts against the outer extending ring. The labyrinth ring is clamped between the air inlet channel outer ring and the air inlet volute, the inner peripheral wall and the outer peripheral wall are attached to the first sealing face and the second sealing face respectively, the radial linear expansion coefficient of the labyrinth ring is larger than that of the first sealing face and that of the second sealing face, the labyrinth ring comprises a ring body and a plurality of pressure reduction gear rings axially arranged at intervals, and a stepped pressure relief cavity is formed between every two adjacent pressure reduction gear rings. In this way, the problem that gas leakage is prone to occurring at the connecting position of the air inlet end shell of the auxiliary power system is solved.

The invention provides a single-stage centrifugal air compressor. An air path cooling system of the single-stage centrifugal air compressor comprises a first cooling air path and a second cooling air path. The first cooling gas path comprises a shell cooling gas channel; an annular channel; a plurality of bearing seat air inlets; the housing cavity is provided with a main air outlet; the bearing seat air outlet hole is communicated between a fit clearance between a first radial air bearing, far away from the volute, of the motor and a motor stator and the housing cavity; the second cooling air path comprises an air inlet gap between the back of the impeller and the end face of the shell close to the impeller, a fit gap between a second radial air bearing of the motor close to the volute and the main shaft, a fit gap between the stator and the main shaft, a fit gap between the stator and the first radial air bearing and a bearing seat air outlet hole which are communicated in sequence; the air inlet gap communicates with the air outlet side of the impeller. The first cooling air path and the second cooling air path can cool rotor parts at different parts of the motor, so that the cooling effect on the rotor parts of the motor is improved, and the use performance of the motor is ensured.

A dual pump unit having a pair of pumps that provide parallel hydraulic paths, and are configured to operate concurrently in opposite rotational directions. The dual pump unit has a sealed casing which includes a suction flange, two volutes in hydraulically parallel configuration, and a discharge flange. The pair of pumps are located within a respective volute of the casing and, in an example, are radially inline and horizontally inline. The casing may include a flattened bottom. Each pump may include a touchscreen for configuration of the respective pump. The pumps are controllable to circulate a circulating medium to collectively provide output to source a load.

The utility model discloses a hydropower station volute pressure maintaining pouring monitoring and early warning device which comprises a volute pressure maintaining pouring assembly, and a monitoring and early warning assembly is arranged on the peripheral side of a volute top cover piece and located on the outer wall of a volute body. The monitoring and early warning assembly comprises a top cover outer sleeve ring arranged on the peripheral side of the volute top cover part in a sleeving mode, a movable arc-shaped mounting plate with the arc-shaped movement adjusting position on the outer wall of the volute body and a sliding block support slidably installed on the outer wall of the movable arc-shaped mounting plate. A first displacement sensor for monitoring displacement of the volute body after concrete pouring is arranged on the outer wall of the sliding block support, and second displacement sensors for monitoring the displacement condition of the seat ring piece are arranged on the inner walls of the upper side and the lower side of the seat ring piece correspondingly. A stress protection adjusting assembly used for resetting and adjusting the displaced volute body is further arranged outside the peripheral side of the volute body, and the terminal of the stress protection adjusting assembly is used for applying force to push the volute body to reset.

The invention relates to a range hood and a control method of the range hood, the range hood comprises a centrifugal fan, the centrifugal fan comprises a volute and a current collector, the volute comprises a front side plate, an air inlet is formed in the front side plate, and the current collector is connected to the air inlet of the front side plate; the current collector comprises an annular flow guide part and a connecting ring extending outwards from the flow guide part in the radial direction, and further comprises a locking rotary knob rotationally arranged on the connecting ring and used for locking the connecting ring and a front side plate of the volute, and a magnet capable of rotating along with the locking rotary knob is further arranged on the portion, located on the front side of the connecting ring, of the locking rotary knob. The volute is further provided with a Hall sensor, the Hall sensor is electrically connected with a control system of the range hood, the control system judges the amount of oil dirt attached to the centrifugal fan according to the variable quantity of a magnetic field signal transmitted by the Hall sensor, and then cleaning reminding is given out through an alarm device. The method has the advantages that oil contamination amount detection is more accurate, and the misjudgment condition of cleaning reminding can be effectively reduced.

The utility model provides an upper air outlet cavity of a mobile air conditioner. The upper air outlet cavity comprises an upper volute assembly and a lower volute assembly which are arranged in an air conditioner shell. The upper volute assembly comprises an upper volute and a first impeller arranged in the upper volute, a first air inlet and a first air outlet are formed in the side wall of the upper volute, the first air outlet is formed upwards, one or more cold air outlets corresponding to the first air outlet are formed in the top of the air conditioner shell, and the first air inlet is communicated with the first air outlet. An evaporator for cooling airflow is arranged on an air inlet path of the first air inlet; the lower volute assembly comprises a lower volute and a second impeller arranged in the lower volute, a second air inlet and a second air outlet are formed in the side wall of the lower volute, the second air inlet is arranged downwards, and a condenser is arranged on an air inlet path of the second air inlet. The upper air outlet cavity of the mobile air conditioner is compact in structure, long in air supply distance, capable of adjusting the air outlet direction and angle and good in using effect.

The invention relates to a centrifugal fan and an air conditioner in the technical field of air conditioners, the centrifugal fan comprises a volute and an impeller, the volute is provided with an air inlet and an air outlet, the impeller is arranged in the volute, an air duct structure comprises n partition plates, and n is larger than or equal to 2; n partition plates are designed to be arranged in the volute at different radial positions and extend in the unfolding direction of the volute molded line; the front ends, away from the air outlet, of the n partition plates are not located on the same circumferential angle, the closer the partition plates on the side wall of the volute are, the larger the circumferential angle of the partition plates on the side wall of the volute is, through the multi-layer and asymmetric flow channel division design of the n partition plates, the aerodynamic performance, efficiency and noise performance of the centrifugal fan are comprehensively improved, and the service life of the centrifugal fan is prolonged. And the complex three-dimensional flowing air flow in the volute is precisely regulated and controlled.

The utility model discloses a novel turbocharger which comprises a gas compressor volute, a bearing body and a turbine box. The left end and the right end of the bearing body are in sealed connection with the gas compressor volute and the turbine box correspondingly. Two full-floating bearings are arranged in the bearing body; a turbine rotating shaft is pivoted in the full-floating bearing; the upper part of the bearing body is provided with a bent oil inlet channel; an oil inlet formed in the lower end of the oil inlet channel communicates with a top opening in the left end of the lubricating oil way. An oil return cavity is formed in the lower part of a shell of the bearing body; an oil return hole is formed in the bottom of the oil return cavity; and a water cooling cavity is formed in the bearing body. The supercharger is provided with the oil return cavity and the water cooling cavity, the two ends of the water cooling cavity are connected with the water inlet and the water outlet, the internal space can be effectively utilized, the structure is more compact, the efficient heat dissipation effect can be achieved in the limited space, and the overall space of the supercharger is saved; according to the utility model, the problems of incompact structure, large volume and the like of the water-cooling row can be solved, and the effects of compact structure and small volume are achieved.

The invention relates to the field of mechanical engineering, in particular to a hydraulic-structure collaborative optimization design method for a shield pump, and aims to solve the problems of load distortion and structure matching imbalance caused by traditional staged optimization. The method comprises the following steps: constructing a fluid-solid bidirectional coupling simulation model, and extracting transient hydraulic loads under multiple working conditions; establishing a structure dynamic response agent model based on modal superposition and Gaussian process regression; key coupling parameters such as the impeller outlet width and the volute base circle diameter are recognized through a Sobol method; and the efficiency, the lift fluctuation rate, the stress and the vibration are taken as multiple targets, and a Pareto optimal solution is searched through an improved genetic algorithm. Manufacturing constraints are embedded in the optimization process, the single period is shorter than 48 hours, and fatigue life evaluation and knowledge base intelligent recommendation are supported. According to the method, closed-loop cooperation of hydraulic excitation and structural response is achieved, the vibration prediction error is lower than 10%, the optimization dimension is compressed to be within 5 dimensions, the efficiency is improved by 20 times or above, and the performance reliability and the design intelligence level of the shield pump are remarkably improved.

An aspect of an exhaust turbine according to the present disclosure is provided with: a rotating shaft; a turbine wheel attached to one end side of the rotating shaft; a turbine housing having a scroll portion formed on an outer peripheral side of the turbine wheel; a bearing housing that accommodates a bearing for supporting the rotating shaft; a fastening member that fastens a first flange portion of the turbine housing and a second flange portion of the bearing housing together; and a heat-shielding plate having an outer peripheral edge portion held between the first flange portion and the second flange portion. In a first cross section that passes through the center of the rotating shaft and a tongue portion of the turbine housing along an axial direction of the rotating shaft, when the innermost position, in a radial direction of the rotating shaft, of a contact surface between the first flange portion and the outer peripheral edge portion of the heat-shielding plate is defined as a first seal inner end, the innermost position, in the radial direction, of a contact surface between the second flange portion and the outer peripheral edge portion of the heat-shielding plate is defined as a second seal inner end, and one of the first seal inner end and the second seal inner end that is positioned outside in the radial direction is defined as a seal inner end, the seal inner end is disposed outside the tongue portion in the radial direction.

According to the refrigeration extractor hood system and the control method thereof, a first three-way valve and a first temperature sensor for detecting the temperature of an exhaust pipe are installed on the exhaust pipe of a refrigeration system, a first heat exchange pipe is installed on the volute annular wall of an oil smoke suction fan, and a first port of the first three-way valve communicates with an outlet of a compressor; a second port of the first three-way valve is communicated with an inlet of the condenser, a third port of the first three-way valve is communicated with an inlet of the first heat exchange pipe, an outlet of the first heat exchange pipe is communicated with an inlet of the condenser, and the controller receives output signals of the first temperature sensor and correspondingly controls the first three-way valve. The controller of the system adjusts the guiding of the three-way valve according to the temperature of the exhaust pipe, and adjusts the amount of refrigerant entering the first heat exchanger on the volute annular wall, so that the temperature of the volute annular wall reaches a grease melting point, grease can smoothly flow into an oil cup, and the volute is self-cleaned. In addition, an oil fume suction fan is used for conducting auxiliary heat dissipation on the heat dissipation module, and oil fume is subjected to grease separation by means of the cooling capacity of the refrigerating system.

The invention discloses a high-stability sealing process gas compressor and a shaft sealing structure thereof. The high-stability sealing process gas compressor comprises a compressor volute, a compressor sealing body, an impeller and a driving shaft. The driving shaft is arranged in the compressor sealing body, and the driving shaft is fixedly connected with the impeller; the compressor volute and the compressor sealing body are assembled in the radial direction of the driving shaft to form a vortex channel, and the impeller is assembled at an inlet of the vortex channel. A rotary sealing structure assembled in the radial direction is arranged between the compressor sealing body and the driving shaft. According to the compressor structure, the compressor volute, the compressor sealing body and the special rotary sealing structure are assembled in the radial direction, vertical horizontal assembly is not needed, and rapid assembly of the compressor structure is achieved; the compressor volute and the compressor sealing body are integrally cast respectively, and the rotary sealing structure is specially matched with the structural improvement of the radially-assembled compressor structure, so that the risk of process gas leakage is reduced.

The invention relates to the technical field of auxiliary power systems, in particular to a manufacturing method of an air supply device of an auxiliary power system. The method comprises the steps that a high-pressure air pressure distribution area under the working state of an auxiliary power system air supply device is obtained; determining a positioning surface and a sealing surface of the air supply device of the auxiliary power system according to the distribution area; the assembly tolerance of the auxiliary power system air supply device is determined according to the positioning face and the sealing face; an air inlet channel shell, an air inlet air pocket, an air inlet channel outer ring, an air inlet volute, a labyrinth ring, a locking unit and a rotor are machined according to the assembly tolerance; and an auxiliary power system air supply device is assembled, so that the air inlet channel shell, the air inlet air pocket, the air inlet channel outer ring and the air inlet volute sequentially abut against one another in the axial direction, the labyrinth ring is pressed between the outer side ring face of the outer sealing barrel and the inner side ring face of the volute positioning barrel, and a stepped pressure relief cavity is formed between every two adjacent pressure relief ring gears. Therefore, the problem that the air inlet end shell of the auxiliary power system is very difficult to position and seal well is solved.

The invention discloses a powder concentrator for powder materials, and relates to the technical field of powder concentrators, the powder concentrator comprises an annular volute and a grading area arranged in the annular volute, the grading area comprises a plurality of guide blades, the guide blades are arranged in the annular volute in an annular array mode, and the angles of the guide blades can be adjusted according to different particle sizes; the rotating cage is rotationally installed in the annular volute and located in the center of the inner sides of the multiple guide blades; materials enter the base flow guide cone and flow upwards; annular airflow fed by the annular volute on the periphery enters the rotating cage through the tangential angle regulated and controlled by the guide blades, and is separated under the rotating action of the rotating cage. The invention provides a dynamic powder selecting channel with an inner ring for supplying air materials and an outer ring for discharging coarse materials for the first time, and a complete spiral shear flow field is constructed; an annular auxiliary air supply fan is externally arranged, the front shearing and particle staying path of the rotating cage is enhanced, and separation dead angles are avoided; the angles of the guide blades are adjustable, different particle size / productivity requirements are met, and the working condition matching performance is improved.

The utility model provides an obliquely-installed air duct of a mobile air conditioner, which comprises a shell serving as an installation carrier, and the shell is hollow and forms an installation cavity; the volute assembly is obliquely arranged in the mounting cavity, the volute assembly comprises an upper volute assembly and a lower volute assembly located below the upper volute assembly, an upper volute cavity and a lower volute cavity are formed in the upper volute assembly and the lower volute assembly respectively, the upper volute cavity and the lower volute cavity are coaxially arranged, and the axis of the upper volute cavity and the axis of the lower volute cavity incline to the horizontal plane; the side wall of the upper volute cavity is provided with an exhaust channel, the exhaust channel extends upwards, is in butt joint with a first air outlet in the top of the shell and is used for discharging air, an evaporator is arranged on an air inlet path of the upper volute cavity, and a condenser is arranged on an air inlet path of the lower volute cavity. The inclined air duct of the mobile air conditioner is compact in structure, small in size, low in manufacturing cost and use cost, convenient to assemble, high in air outlet speed, long in air supply distance, low in working noise and good in use effect.

The invention discloses an air suspension turbine power generation and refrigeration integrated device which comprises a shell, a stator and a rotor spindle, the rotor spindle is rotationally arranged in the shell through a bearing assembly, the stator is fixed in the shell and is coaxial with the rotor spindle, and an air gap exists between the stator and the rotor spindle to form a permanent magnet synchronous generator. The rotor further comprises a first-stage volute, a second-stage volute, a first-stage radial flow turbine, a second-stage radial flow turbine, a volute connecting pipe and a cooling water jacket, the first-stage volute and the second-stage volute are fixed to the two ends of the shell respectively, and the first-stage radial flow turbine and the second-stage radial flow turbine are coaxially fixed to the two ends of the rotor spindle respectively and are arranged back to back; the first-stage radial flow turbine is located in the first-stage volute, the second-stage radial flow turbine is located in the second-stage volute, the first-stage volute is provided with a high-temperature and high-pressure air inlet and a first-stage air outlet, and the second-stage volute is provided with a second-stage air inlet and an expansion cooling air exhaust port; the device has the advantages of being capable of stably running at a high speed in a high-altitude low-pressure environment and simultaneously achieving efficient power generation and refrigeration functions.

The invention relates to the technical field of drainage pumps, in particular to a non-shaft seal type energy-saving centrifugal pump with a flow dividing function, which comprises a pump body, a volute, a water inlet and a water outlet, the water inlet is formed in the front end surface of the volute, the water outlet is formed in the circumferential surface of the volute, and the water inlet is communicated with the water outlet; the first backflow hole is formed in the volute; the impeller is arranged in the inner cavity of the volute, and a balance hole is formed in the impeller; the front end of the servo motor shaft is provided with an installation shaft head, and the installation shaft head and the impeller are installed and fixed in a threaded mode. Residual liquid does not leak like the rear portion, if leakage occurs, the residual liquid flows back to the interior of a low-pressure position through the backflow groove and the backflow hole, a set of auxiliary blades are arranged behind the backflow groove, the auxiliary blades rotate together with the shaft during starting, and it is further guaranteed that the residual liquid does not leak in the axial direction.

The utility model discloses a straw cleaning device and a returning machine adopting the straw cleaning device, the straw cleaning device comprises one or a plurality of cleaning assemblies arranged in parallel, each cleaning assembly comprises a volute, the volute is fixedly arranged and sleeved outside a first auger, the first auger comprises a shaft rod, the shaft rod is sleeved outside the volute, and the shaft rod is sleeved outside the first auger. A spiral extending blade is arranged on the shaft rod, the volute comprises a cambered surface section, the two ends of the cambered surface section extend outwards to form a first free end and a second free end, the volute and the first auger define a removing cavity, and the first free end and the second free end jointly form a suction inlet with a downward opening. When the first auger rotates under the action of an external driving unit, guiding airflow can be generated on the periphery of the first auger, so that straw enters the clearing cavity through the suction inlet. The field returning machine comprises a machine frame, and a straw smashing unit and a straw cleaning device are sequentially arranged on the machine frame. The straw cleaning device is reasonable in structure and good in straw cleaning effect.

The impeller type centrifugal pump suitable for the low-specific-speed working condition comprises a volute and an impeller, the impeller comprises a rotating shaft, a first impeller cover plate, a second impeller cover plate and a plurality of blades, and the first impeller cover plate, the blades and the second impeller cover plate are sequentially and tightly arranged in the axial direction of the rotating shaft. The impeller is arranged in the volute; the volute is provided with a fluid inlet and a fluid outlet; in the axial direction, the distance between the opposite vertical faces of the radial edges of the first impeller cover plate and the second impeller cover plate is smaller than the width of the fluid outlet. And the distance between the opposite vertical surfaces of the radial edges is greater than the width of the fluid outlet. The axial width of the fluid outlet of the centrifugal pump is discussed separately from a general centrifugal pump design theory, so that the design accuracy of the low-specific-speed centrifugal pump is improved, the number of design iterations can be reduced, and the development cost is reduced.

The invention provides a leading pretreatment device for pumping and cleaning clustered marine organisms and floaters, the leading pretreatment device comprises a buoyancy platform, a butt joint structure, a controller and a dispersion assembly, a treatment cabin is arranged in the middle of the buoyancy platform, and the dispersion assembly is composed of a turbulent flow triggering assembly and a liquid spraying assembly; impurities are collected in a suction mode, the device is provided with self-buoyancy and a modular structure and can be rapidly in butt joint with a tail bag of an interception net, the optimal suction posture is achieved, and the core innovation of the device is that a dispersing assembly and a cutting device are sequentially arranged in the suction direction, material distribution is achieved through a rotating cylinder and a conical column, and high-frequency vibration and a reverse micro-impact mechanism are combined; the block mass structure is effectively damaged; by adopting the unique design of the fixed impeller and the rotary volute, an annular liquid curtain is formed when the barrel rotates, so that the winding property and the overall strength of disaster-causing objects can be reduced, the disaster-causing objects are more easily scattered and cut by subsequent components, the subsequent mechanical load is reduced, the problem of blockage of a flow channel is solved, and the energy consumption and the abrasion of equipment are reduced.