2569 results about "Volute" patented technology

The invention relates to a centrifugal fan, a range hood and a design method of the centrifugal fan, and relates to the technical field of range hoods. According to the centrifugal fan, the three-section type lines of the first arc section, the second arc section and the third arc section of the arc section protrusion are designed differently, diffusion is conducted on the volute in the axial direction, compared with two-dimensional flow of a traditional volute, diffusion in the axial direction is considered, and therefore the flow efficiency of the volute is greatly improved. And three-dimensional flow of airflow in a flow channel in the volute is considered. On one hand, the arc section protrusions designed in this way can well eliminate angle vortexes, and airflow can flow in a flow channel in the volute better; secondly, the arc section protrusions designed in this way are better attached to real flow in the volute, and the air inlet efficiency is improved; and thirdly, the arc section protrusions designed in this way can eliminate the assembling gap between a volute and a case of a traditional range hood, noise of the range hood is reduced, and user experience is improved.

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 provides welding equipment for volute type fan machining, and relates to the technical field of welding devices.The welding equipment comprises a mounting mechanism, during use, a screw is rotated, a positioning block is moved to the corresponding height, a prefabricated rod is sleeved with a pressing plate from top to bottom, and when the pressing plate is pressed to the upper end of a volute type fan, the positioning block is moved to the corresponding height; the elastic block can be clamped into the fixing groove in the pressing plate, the pressing plate can be fixed on the prefabricated rod while pressing and fixing the volute type fan, in this way, the pressing plate can be conveniently installed on the prefabricated rod, the fixing height of the pressing plate can be changed by adjusting the installation position of the positioning block, and therefore the volute type fan can be conveniently installed. Therefore, the fixing device can adapt to more types of volute fans, and the problems that an existing volute fan shell is fixed to a rotary disc through a screw and a pressing plate, the pressing plate is very inconvenient to mount and dismount through the screw fixing mode, workers need to spend a certain time for mounting and dismounting, and the working efficiency is high are solved. And therefore, the processing efficiency is reduced.

Disclosed in the present invention is a delivery pump for a cleaning system using an ice-containing medium. The delivery pump comprises a volute (10), an impeller (20), a diffuser (30) and a rotary shaft (40), wherein the impeller comprises a front disc (21), a rear disc (22) and blades (23); and the diffuser comprises a first side wall (31) and a second side wall (32). The delivery pump is characterized in that the second side wall comprises an arc-shaped transition portion (33); a backflow channel is formed in the arc-shaped transition portion; the backflow channel comprises a first arc-shaped channel (34) and a second arc-shaped channel (35); the front disc is provided with communication grooves (24); and a plurality of communication grooves are distributed in a circumferential direction, such that part of a liquid in the diffuser flows back into an impeller flow channel outlet portion of the impeller through the backflow channel and the communication grooves. The present invention can effectively reduce pressure fluctuation, pressure loss and vibration, thus improving the hydraulic performance and stability of the delivery pump.

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 relates to an air supply component, air conditioning equipment and an air supply control method and device.The air supply component comprises a shell, a lower air guide assembly, cross-flow fan blades and a volute, and the cross-flow fan blades and the volute are arranged in the shell; the lower air guide assembly is located below the cross-flow fan blades. In the first state of upward air supply, the volute is located above the cross-flow fan blades, and the volute is connected with the shell on one side. And in the second state of downward air supply, the volute is located on one side of the cross-flow fan blade, and the volute and the lower air guide assembly are in butt joint to form a molded line. Therefore, through the design of the volute with the variable position, a better air supply effect can be provided under the condition of air supply in different air directions.

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 technical field of cooling water pumps for engines, and particularly discloses an electronic water pump which comprises a water pump shell, an impeller, a middle shaft, a stator assembly and a rotor assembly, one end of the water pump shell is in butt joint with a volute cavity in an engine cylinder, a mounting cavity is integrally formed in the water pump shell, and a PCB is mounted in the mounting cavity; a flow channel is formed in the center of the center shaft, a plurality of liquid drainage holes are formed in the part, located in the cavity, of the center shaft in a surrounding mode in the radial direction and located in the end, away from the impeller, of the cavity, a plurality of through holes are further formed in the water pump shell, and the two ends of each through hole communicate with the cavity and the volute cavity correspondingly. The middle shaft further communicates with a first conveying pipe; a plurality of cooling channels are formed in the part, between the mounting cavity and the cavity, of the water pump shell at intervals, one end of each cooling channel communicates with the volute cavity, and the other end of each cooling channel communicates with the first conveying pipe through a second conveying pipe; the electronic water pump can respectively cool the motor and the PCB according to the cooling requirements of the motor and the PCB.

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 discloses a heating and ventilation indoor unit and a heating and ventilation system. The heating and ventilation indoor unit comprises a first box body, a second box body, a partition plate, a mounting frame and a centrifugal fan. The second box body is connected with the first box body, and the partition plate is arranged between the first box body and the second box body; the mounting frame is arranged in the first box body; the centrifugal fan is arranged in the first box body and comprises a volute, an impeller and a flange, the volute is installed on the installation frame and penetrates through the partition plate, the impeller is contained in the volute, and the flange is arranged on the volute and abuts against the partition plate. In this way, the gravity center of the volute is close to the installation position, and therefore the downward pulling force borne by the volute is reduced. Therefore, after installation, the position of the volute is not prone to deviation, the position stability of the volute is improved, the anti-seismic performance of the volute is improved, the position of the impeller in the volute is not prone to deviation, and therefore the wind field noise of the centrifugal fan area can be reduced.

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 utility model discloses a centrifugal machine and an air conditioning system. The centrifugal machine comprises a shell, a bearing protection part, a volute and an impeller, wherein a first cavity is formed in the shell; the bearing protection part is arranged on the shell and forms a bearing cavity communicated with the first cavity, and a bearing used for supporting the pivotal shaft is arranged in the bearing cavity; the volute is arranged on the shell, and a second cavity is defined between the volute and the shell. The impeller is connected with the pivot shaft and is rotatably arranged on the volute; a first channel for communicating the second cavity with the bearing cavity is formed between the impeller and the shell; a second channel communicated with the bearing cavity is formed in the shell. According to the centrifugal machine, the second channel is arranged on the shell to introduce low-temperature and high-pressure gas to be opposite to high-temperature and high-pressure gas in the first channel, the gas leakage loss of the first channel is reduced, the efficiency of the centrifugal machine is improved, meanwhile, the low-temperature gas enters the motor cavity to cool and dissipate heat of electrical components, and the service life of the centrifugal machine is prolonged. The service life of the centrifuge is prolonged.

The invention relates to a multi-stage centrifugal pump transition flow channel and a flow channel design method. The transition flow channel comprises a delivery chamber, a flow channel diffusion section and a suction chamber. An outlet of the delivery chamber located at the upper stage is communicated with an inlet of the flow channel diffusion section, and an outlet of the flow channel diffusion section is communicated with an inlet of the suction chamber; the delivery chamber is of a double-volute structure and is symmetrically arranged about the center line of the volute, and the sum of the areas of the two symmetrical throats is equal to the area of a single volute; the flow channel diffusion section obliquely penetrates through the pump body, the internal sectional area of the flow channel diffusion section is gradually increased in the direction from an inlet to an outlet until the sectional area is equal to or slightly smaller than the inlet area of the suction chamber, the flow channel diffusion section is symmetrically arranged about the center line of the volute, and the suction chamber is symmetrically arranged about the center line of the volute. The radial force can be basically balanced, so that the pump operates stably, and the noise and vibration of a unit are reduced; the radial size of the pump body is small and space is saved; the efficient range is wide; the axial distance of the transition flow channel is reduced, and the axial size of the pump body is reduced.

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 purifier comprises a shell, a volute and an impeller, the shell is provided with an air inlet and an air outlet, the volute is arranged in the shell, the impeller is arranged in the volute, a first airflow channel is formed between the outer edge of the impeller and the inner wall of the volute, the impeller can drive external air of the shell to enter the shell from the air inlet, and the impeller can drive external air of the shell to enter the shell from the air outlet. The wall face of the volute comprises a plurality of face sets, the face sets are arranged in the circumferential direction of the impeller, each face set comprises a first surface, a second surface and a third surface, and the first surface, the second surface and the third surface are arranged in the circumferential direction of the impeller. On the radial section of the purifier, the curvature of the first surface is smaller than or equal to that of the third surface, and the curvature of the third surface is smaller than that of the second surface. Through curvature change, accumulation of rotating airflow in the volute can be avoided, the axial airflow speed of the purifier is increased, and the wind speed and the flow guide amount of the whole purifier are increased.

A water drainage device for a water turbine volute comprises a push-pull device and a valve plate, the push-pull device is located below a water drainage hole of the water turbine volute, the water turbine volute is connected with a water drainage pipe on the lower side of the water drainage hole, a telescopic rod of the push-pull device extends upwards to penetrate through the water drainage pipe and the water drainage hole, and the valve plate is connected to the top of the telescopic rod; the telescopic rod is a hollow pipe body, a plurality of water spraying holes are formed in the upper end of the telescopic rod, and a connector is arranged at the lower end of the telescopic rod. A telescopic rod of the push-pull device is a hollow pipe body, a plurality of water spraying holes are formed in the upper end of the telescopic rod, and high-pressure water sprayed out of the water spraying holes is used for backflushing the drainage holes, so that sundries on the periphery of the drainage holes are removed, and the valve plate can seal the drainage holes.

The water pump comprises a shell assembly, a rotor assembly and a stator assembly, the shell assembly comprises a machine shell, a pump cover and a volute, the pump cover is connected with the front end of the machine shell in a sealed mode, the pump cover is provided with a water pumping cavity, a water inlet pipeline and a water outlet pipeline, the water inlet pipeline and the water outlet pipeline are communicated with the water pumping cavity, and the volute is arranged in the machine shell; the front end of the volute extends to the front end of the machine shell and is connected with the machine shell in a sealed mode, the volute is provided with a rotor cavity communicated with the water pumping cavity, the rear end of the volute is provided with a drainage pipeline extending out of the machine shell, and an annular stator cavity is formed between the machine shell and the volute. The rotor assembly comprises a rotor and an impeller, the rotor is rotatably installed in the rotor cavity, the impeller is fixedly connected to the end of the rotor and located in the water pumping cavity, a cooling channel is formed between the rotor and the volute, and the two ends of the cooling channel communicate with the water pumping cavity and the drainage pipeline correspondingly; the stator assembly is arranged in the stator cavity. According to the embodiment of the invention, the rotor is water-cooled by introducing liquid, and the pressure in the water pump can be balanced.

Aircraft turbomachine including a centrifugal compressor, a combustion chamber, the combustion chamber being supplied by the compressor via a diffuser and via a straightener, and a heat exchanger, the exchanger including a first circuit, supplied with exhaust gas from the turbomachine, and a second circuit, which are connected by volutes on the one hand to an outlet of the diffuser and on the other hand to an inlet of the straightener, the volutes having reversed winding directions such that their connection ports to the exchanger are independent of one another and are substantially diametrically opposed, and such that the minimum cross section of each duct is situated at a larger cross section of the other duct.

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.