62results about How to "Achieve beneficial effects" patented technology

The invention discloses an array substrate, a display device and a drive method thereof, relating to the technical field of display. The array substrate comprises grid lines, data lines and pixel electrodes, and also comprises two pixel switches with multi-gate structures, wherein the pixel switches are arranged on cross joints of the grid lines and the data lines, one pixel switch is opened by a positive voltage of a grid, the other one pixel switch is opened by a negative voltage of the grid, the two pixel switches with multi-grid structures on the cross joint of one grid line and one data line are used for driving two pixel electrodes arranged on two sides of the data line and connected with the data line; and all grids of the two pixel switches with multi-grid structures on the cross joint of one grid line and one data line are connected with the grid line. Because the pixel switch opened by the negative voltage of the grid and the pixel switch opened by the positive voltage of the grid are of a multi-grid structure, according to the array substrate provided by the invention, a leak current can be effectively inhibited.

Embodiments of the invention provide a data transmission method and device. The method comprises the following steps that a multicast transmission control network element receives a first non-access layer message, wherein the first non-access layer message comprises receiving quality indication information of a terminal for receiving data on a multicast transmission path; after the multicast transmission control network element receives the receiving quality indication information, the multicast transmission control network element determines to start a unicast transmission path; and the multicast transmission control network element sends a first indication message to a user plane network element, wherein the first indication message is used for indicating to start a first unicast transmission path, and the first unicast transmission path is used for assisting the multicast transmission path to transmit data to the terminal. Through the application of the embodiments of the invention,the data receiving quality indication information of the terminal can be obtained through the non-access layer message, and the unicast transmission path is used for assisting the multicast transmission path to transmit the data to the terminal, so that the data transmission in a double-flow mode is realized, and the method and the device have the advantages that the reporting efficiency of the data receiving quality is improved, the data transmission reliability is enhanced and the data transmission efficiency is improved.

The present invention discloses a signal sending method and device for increasing the accuracy degree of channel estimation of a receiving end, thereby increasing the accuracy degree of data decoding of the receiving end. The method is applied to a system in which a physical layer frame structure includes a preamble and a payload PL field, and the method includes: inserting, among OFDM time domain symbols in the PL field, one or more pilot-frequency time-domain symbols to obtain a physical layer frame; and sending, to the receiving end, the physical layer frame; wherein the preamble and the pilot-frequency time-domain symbols are used together to enable the receiving end to conduct channel estimation.

The embodiment of the invention discloses an ultraviolet early-warning system and a wearing device. The method comprises that the wearing device detects the ultraviolet intensity value of a current environment and user skin parameters, wherein the user skin parameters comprise moisture and oil content under the surface of a user skin; the wearing device determines a user skin type according to the user skin parameters; the wearing device determines the limit duration of a user located in the current environment based on the ultraviolet intensity value and the user skin type; and when the wearing device detects that the duration of the user located in the current environment is more than the limit duration, the wearing device generates and outputs prompting information. According to the technical scheme provided by the embodiment of the invention, the defect that the existing wearing device is single in ultraviolet detection function is overcome; and the method and device are beneficial for realizing the diversity of the ultraviolet detection function of the wearing device.

The invention discloses an AR display device which comprises a display lens, a power supply component, a motion detection component and a control component. The display lens comprises an electrochromic layer, the motion detection component detects the motion parameters of the AR display device and outputs the motion parameters to the control component, the control component determines a first output voltage according to the motion parameters and sends a first output voltage to the power supply component, and the power supply component supplies power to the electrochromic layer according to thefirst output voltage so as to adjust the transmittance of the electrochromic layer. When the transmittance of the electrochromic layer is adjusted to be higher according to the motion parameters, thetransmittance of the display lens is higher, so that a user can clearly see the environment of the real world through the display lens when using the display lens; and when the transmittance of the electrochromic layer is adjusted to be lower according to the motion parameters, the electrochromic layer can provide a darker display background for the display lens, so that the contrast ratio and the definition of a display image of the display lens are improved, and the user experience is improved. The invention further discloses a transmittance adjusting method of the AR display device and a wearable system.

The invention relates to the technical field of lithium battery production equipment, in particular to a pole piece cutting and conveying device and a piece stacking system. The pole piece cutting and conveying device comprises a pole piece unwinding mechanism, a pole piece cutting mechanism and a pole piece conveying mechanism which are arranged in sequence, the pole piece cutting mechanism is used for cutting the pole piece material belt unwound by the pole piece unwinding mechanism to obtain a pole piece; the pole piece conveying mechanism comprises an annular feeding track and a plurality of conveying trolleys; the annular feeding track comprises a feeding section and a backflow section which are connected end to end, the end-to-end connecting positions of the feeding section and the backflow section are a feeding station and a discharging station respectively, and each conveying trolley can pick up the pole pieces at the feeding station and release the pole pieces at the discharging station. The lamination system comprises the pole piece cutting and conveying device. According to the pole piece cutting and conveying device and the piece stacking system, the pole pieces are picked up, conveyed and released through the material conveying trolley, the transfer offset is small, the transfer process is few, and piece cutting, conveying and piece stacking can be efficiently and accurately conducted.

The invention provides a split type insulation intermediate tank induction heater. The split type insulation intermediate tank induction heater can effectively solve the problems that according to existing intermediate tank induction heating equipment, heating can be caused by interaction vortexes generated by an intermediate tank and peripheral equipment during work, and consequently the efficiency is low, and the using power is limited; and electromagnetic force is made to break through a critical point for extruding non-metallic inclusions, and the practical effect of refining molten steelis achieved. The split type insulation intermediate tank induction heater is composed of two parts including the split type insulation intermediate tank and a split insulation induction heater body, the split type insulation intermediate tank is composed of an intermediate tank split steel shell and an intermediate tank sub-cavity refractory body, the intermediate tank sub-cavity refractory body is composed of a molten steel impact cavity, a heater protection refractory body and a molten steel casting cavity, and the heater protection refractory body is internally provided with a heating channel and is used for communicating the molten steel casting cavity and the molten steel casting cavity; and meanwhile, a heater coil installing hole is formed, the split insulation induction heater bodyis composed of an upper iron core, a lower iron core and an initial coil, and all components are fixedly connected with the intermediate tank split steel shell, and an insulation structure is arranged.

The invention discloses a light-emitting diode. The light-emitting diode comprises a base plate and a luminous epitaxial layer, wherein the base plate is provided with a front main surface and a back main surface, a V-shaped slot is formed in the front main surface of the conductive base plate, and the surface of the V-shaped slot is a reflecting surface; and the luminous epitaxial layer is formed in the base plate, and the projection of the edge of the luminous epitaxial layer in the vertical direction is positioned between the bottom and the internal side edge of the V-shaped slot, so that the light sent out from the edge of the luminous epitaxial layer is emitted into a mirror surface of the V-shaped slot, and is emitted out towards the outside. The structure of the light-emitting diode can efficiently enhance the light extraction efficiency of a device, and controls a path of light at the marginal area of the luminous epitaxial layer.

The invention relates to the technical field of material circulation and storage, in particular to a material storage box mechanism and a material storage device. The material storage box mechanism comprises a box body, a pressing plate and an elastic reset component, wherein a containing space allowing materials to be sequentially stacked in the first direction is formed in the box body, and the box body is provided with a first end and a second end in the first direction; and the elastic reset component is connected between the box body and the pressing plate, the pressing plate is movably arranged in the containing space, and the elastic reset component enables the pressing plate to face the first end to abut against the materials. According to the material storage box mechanism, the materials can be always kept in the state of being pressed towards the first end of the box body through the pressing plate, on one hand, the remaining materials can be kept to be neatly stored at any time, on the other hand, due to the fact that the remaining materials are always pressed towards the first end, continuous memory material taking through the first end can be facilitated, the material taking action cannot be interrupted, and the material taking efficiency is further improved.

The embodiment of the invention discloses a multimedia stream playing method and electronic equipment, and relates to the field of electronic equipment, so that the multimedia stream can be more accurately and stably played continuously among different pieces of equipment, and the operation is easy. According to the specific scheme, first electronic equipment detects first biological recognition information, the first biological recognition information is used for identifying a first user, and biological recognition information of different users is different. And the first electronic equipment acquires a first broadcast control record corresponding to the first user according to the first biological recognition information. Wherein the first broadcast control record is acquired from the second electronic equipment, the first broadcast control record comprises the first time of the first multimedia stream recorded by the second electronic equipment, and the second electronic equipment is the electronic equipment corresponding to the first user. And the first electronic equipment plays the first multimedia stream from the first time according to the first broadcast control record.

The invention relates to the technical field of photoetching equipment and process, concretely relates to a mask alignment system, a mask alignment method and photoetching equipment. The mask alignment system comprises a data processing device, an image acquisition device, a workbench, a mask table, an imaging device and a projection objective lens. The workbench and the mask table are arranged on the two sides of the projection objective lens respectively, a reference mark of the reference plate is projected on the mask plate in an inverted magnified image mode through the projection objective lens, the object side of the imaging device faces the mask plate, the image collecting device is arranged on the image side of the imaging device, and the data processing device can carry out image processing on shot images to determine the relative position relationship between the mask plate and the workbench. The mask alignment method and the photoetching equipment both adopt the mask alignment system. According to the mask alignment system, the mask alignment method and the photoetching equipment, the limitation on the measurement range is small, and various sleeving marks can be coped with.

The invention relates to the technical field of laser resistance trimming, in particular to an acquisition method of a laser resistance trimming scheme, the laser resistance trimming scheme and a chipresistor. The acquisition method of the laser resistance trimming scheme comprises the following steps that a to-be-trimmed resistor is subjected to primary cutting through a serpentine knife edge, so that the resistance value precision of the to-be-trimmed resistor reaches the preset precision, and the value range of the preset precision is 0.1%-1%; the to-be-trimmed resistor is subjected to secondary cutting through the cutter edge; it is judged whether the resistance precision of the to-be-trimmed resistor reaches the target precision or not; and if the resistance precision of the to-be-trimmed resistor reaches the target precision, it is determined that the laser resistance trimming scheme is that the blank resistor is cut by the serpentine knife edge and the bisection knife edge in sequence. The laser resistance trimming scheme is obtained by adopting the obtaining method of the laser resistance trimming scheme. The chip resistor is produced through the laser resistance adjustingscheme. According to the acquisition method of the laser resistance trimming scheme, the laser resistance trimming scheme and the chip resistor, the precision and the yield of the finished resistor can be improved.

The invention relates to the technical field of fuel filtering and cleaning of mechanical equipment, in particular to a fuel filter and mechanical equipment. The fuel filter comprises a drainage mechanism and a water storage body, wherein a drain hole is formed in the bottom of the water storage body, and a pressure relief hole is formed in the water storage body at a preset height away from the drain hole; the drainage mechanism comprises a drainage valve and a hollow elastic body which are connected, the interior of the hollow elastic body communicates with the pressure relief hole, and a first drainage through hole is formed in the bottom of the hollow elastic body; and the drainage valve is arranged at the drainage hole, and the hollow elastic body can expand or contract to drive the drainage valve to open or close the drainage hole. The mechanical equipment comprises the fuel filter. According to the fuel filter and the mechanical equipment, drainage can be automatically started or stopped in time, the manual maintenance workload is reduced, fuel and water are prevented from being mixed for use due to the fact that fuel and water are not separated in time, the quality of output fuel can be continuously and effectively guaranteed, the working performance of the mechanical equipment is protected, and the service life of the mechanical equipment is prolonged.

The invention relates to an integrated circuit test, and discloses a wiring method and a testing method of wiring resources of an FPGA. The wiring method specifically comprises the following steps ofselecting a direction; executing the wiring process of a unit step length sequentially from each row or each column of the starting wiring unit to each row or each column of the ending wiring unit, and executing the wiring process of the unit step length once from each row or each column of the starting wiring unit in a direction opposite to the selected direction. The testing method is used for testing the distributed tested line segments on the basis of the wiring method. According to the embodiment of the invention, the existing FPGA logic resources can be utilized in a balanced manner, thewiring channels are tested as much as possible in one test pad, the number of test pads required by FPGA wiring resource testing is reduced, the FPGA testing time is shortened, and the test pad development time is shortened.

The invention relates to the technical field of core mold vibration forming, in particular to a rolling disc cleaning device and rolling disc equipment. The rolling disc cleaning device comprises a driving mechanism, a cross beam mechanism and a sweeping mechanism; the driving mechanism is connected with the cross beam mechanism and can drive the cross beam mechanism to rotate around a preset axis; the sweeping mechanism comprises a supporting assembly and a scraping assembly arranged at the top of the supporting assembly; the bottom of the supporting assembly is arranged on the position, awayfrom the preset axis by a preset distance correspondingly, of the cross beam mechanism, and the supporting assembly rotates along with the cross beam mechanism; and the scraping assembly can abut against and scrape the inner wall of a rolling disc. The rolling disc equipment comprises the rolling disc cleaning device. According to the rolling disc cleaning device and the rolling disc equipment, cement paste, fine sand and the like on the inner wall of the rolling disc are stripped and blown off through the scraping assembly of the sweeping mechanism, manual cleaning is replaced with the rolling disc cleaning device, the cleaning duration is shortened, and the working efficiency is improved.

The embodiment of the invention discloses an antenna power control method and electronic equipment. The data processing pressure of a processor in the electronic equipment can be reduced in a multi-antenna scene. According to the specific scheme, a first sensor obtains the states of at least two detection channels, each detection channel corresponds to one state, the state is any one of the first state and the second state, the first state is used for indicating that the capacitance value between an antenna corresponding to the detection channel and a human body is larger than a first threshold value, and the second state is used for indicating that the capacitance value is larger than a second threshold value; the second state is used for indicating that the capacitance between the antenna corresponding to the detection channel and the human body is smaller than a first threshold. The first driving module determines a first gear value according to the states of the at least two detection channels. And the processor controls the transmitting power of the at least two antennas according to the first gear value.

The invention discloses a multifunctional physiotherapy instrument and a physiotherapy system. The physiotherapy instrument includes a physiotherapy head used for multifunctional physiotherapy. The physiotherapy head includes a base and a control box. The control box is connected to the base. The base is provided with a physiotherapy piece. The control box is therein provided with a control circuit electrically connected with the physiotherapy piece and used for controlling the strength of far infrared physiotherapy, magnet therapy and electric stimulation physiotherapy of the physiotherapy piece. A problem that far infrared physiotherapy, electric stimulation physiotherapy and magnet therapy cannot be realized at the same time is solved. The physiotherapy system includes the physiotherapyinstrument and a smart terminal. Information interaction with the smart terminal is also realized through a wireless communicator. The setting of control parameters is performed through the smart terminal and the control parameters are converted to control commands, and the control commands are sent to the multifunctional physiotherapy instrument through the wireless communicator for physiotherapy control.

The invention relates to the technical field of gas turbine air inlet flow testing equipment, in particular to an air inlet flow nozzle assembly and an air inlet flow measuring device. The air inlet flow nozzle assembly comprises a plurality of nozzle flowmeters and a connecting base with a plurality of connecting through holes distributed in an array mode, and the nozzle flowmeters are arranged in the connecting through holes in a one-to-one correspondence mode. A preset number of nozzle flowmeters which are uniformly distributed relative to the connecting seat in the plurality of nozzle flowmeters can be simultaneously started, so that the measurement upper limit of the air inlet flow nozzle assembly reaches the preset air inlet flow. According to the air inlet flow nozzle assembly and the air inlet flow measuring device, the preset number of nozzle flowmeters are combined, so that the air inlet flow nozzle assembly and the air inlet flow measuring device can be suitable for air inlet flow measurement during tests of gas turbines of various models and power levels, and the flexibility is very high.

The invention relates to the technical field of port handling, in particular to a sling torsion proof device, a lifting winding system, and a port crane. The sling torsion proof device includes driving assemblies, transmission assemblies, and fixing assemblies, the fixing assemblies are arranged on the transmission assemblies and are used to fix steel wire rope assemblies connected with a sling, the driving assemblies can drive the transmission assemblies to translate to and fro along a first direction so that the fixing assemblies pull the steel wire rope assemblies to and fro along the firstdirection, the lifting winding system includes the sling torsion proof device, and the port crane includes the lifting winding system. According to the sling torsion proof device, the lifting windingsystem, and the port crane, the torsion of the sling need not to be restored manually by operating personnel, the sling can rotate quickly and reach the tank aligning position, the manpower is savedand the tank aligning efficiency is improved, so that the handling efficiency of a shore bridge can be improved, the inertia torsion of the sling can be eliminated, the occurrence of an accident of tank colliding is prevented, and the sling is prevented from torsion intensification.

The invention provides a double-rail curtain driving assembly and a double-rail curtain driving device, and relates to the field of automatic household products. The double-rail curtain driving assembly comprises a shell body, a first rotating shaft, a second rotating shaft, a main driving mechanism and a switching mechanism; the first rotating shaft and the second rotating shaft are arranged in the shell body, and the two ends of the first rotating shaft and the two ends of the second rotating shaft are rotatably connected to the shell wall of the shell body; the first rotating shaft is separated from the second rotating shaft; the main driving mechanism is installed on the shell body and configured to drive the first rotating shaft to rotate under the first working condition and drive the second rotating shaft to rotate under the second working condition; the switching mechanism is installed on the shell body and configured to drive the main driving mechanism to switch between the first working condition and the second working condition; and the double-rail curtain driving device comprises the double-rail curtain driving assembly. The double-rail curtain driving assembly and thedouble-rail curtain driving device are applied to a double-rail automatic curtain, the curtains on an inner rail or an outer rail can be correspondingly controlled according to needs, and the beneficial effects of stable structure and convenient operation are achieved.

The invention relates to the technical field of product cleaning equipment, in particular to a cleaning platform and an ion cleaning device. The cleaning platform comprises a platform body, cleaning supporting plates, a feeding transfer module and a discharging transfer module; the platform body is provided with a cleaning station and a vacant station, and the two sides of the platform body are a first side and a second side correspondingly in the arrangement direction of the vacant station and the cleaning station; the plurality of cleaning supporting plates are movably arranged on the platform body so as to reciprocate between the cleaning station and the vacant station; the feeding transfer module picks up and transports to-be-cleaned products, so that the to-be-cleaned products are placed on the cleaning supporting plates at the vacant station through the first side; and the discharging transfer module picks up and transports cleaned products so that the cleaned products can be taken out of the cleaning supporting plates at the vacant station through the second side. The ion cleaning device comprises the cleaning platform. According to the cleaning platform and the ion cleaning device, uninterrupted work of feeding, cleaning and discharging of the plurality of products is achieved, and the cleaning efficiency is improved.

The invention relates to the technical field of subway train maintenance, and in particular relates to a coupling disassembling device and a coupling disassembling method. The coupling disassembling device comprises a maintenance track and a traction mechanism; a train to be overhauled is driven into the maintenance track; the traction mechanism is detachably connected with a gear transmission device and exerts traction force on the gear transmission device so that the gear transmission device can rotate between the first state that a first half coupling and a second half coupling are opposite and the second state that the first half coupling and the second half coupling are staggered around the output shaft of the gear transmission device. The coupling disassembling method adopts the coupling disassembling device. When the coupling disassembling device and method are used for overhauling the couplings, a normal train lifting track is not occupied, the operation safety is improved, overhauling of other subway trains is not influenced, the whole bogie does not need to be disassembled from the train, the workload is greatly reduced, the overhauling time is shortened, and the overhauling efficiency is improved.

The invention relates to the technical field of plastic product production, in particular to a color master batch supply device and production equipment. The color master batch supply device comprises a mixing box and a plurality of storage boxes, and the mixing box is provided with an outlet for outputting a mixed color master batch; the mixing box is provided with a plurality of inlets, and discharge ports of the storage boxes are connected with the interior of the mixing box in an on-off manner through the inlets in a one-to-one correspondence manner; and the production equipment comprises the color master batch supply device. According to the color master batch supply device and the production equipment, on the one hand, the frequency of adding the color master batch is reduced, the phenomenon of supply interruption is effectively avoided, manpower is saved, and the working efficiency is improved; and on the other hand, in the multi-color production process, the steps of cleaning and filling are omitted, and therefore the working efficiency can be further improved.

The invention relates to the technical field of ship power equipment and particularly relates to a ventilation device and power equipment. The ventilation device comprises a cabin, a first air supply assembly, a second air supply assembly, a first control assembly and a second control assembly, wherein an air supply outlet of the first air supply assembly extends into the cabin and supplies air to an air inlet of an internal combustion engine, and the first control assembly is electrically connected with the first air supply assembly so as to control the air supply amount of the first air supply assembly; an air supply outlet of the second air supply assembly extends into the cabin and supplies air into the cabin, and the second control assembly is electrically connected with the second air supply assembly so as to control the air supply amount of the second air supply assembly. The power equipment comprises the ventilation device. According to the ventilation device and the power equipment, the ventilation device can ensure that adjustment of environmental parameters in a cabin is not affected by changes of combustion requirements of the internal combustion engine, and therefore the internal combustion engine can continuously and stably operate in a constant external environment.

The embodiment of the invention discloses a collaborative login method, relates to the field of electronic equipment, and enables a user to conveniently complete the effect of code scanning login through a small amount of operation on a computer. According to the specific scheme, a login two-dimensional code is displayed, wherein the login two-dimensional code is used for logging in a first application program or a first website; and sending a first message to the second electronic equipment, wherein the first message comprises the image information of the login two-dimensional code. And receiving display information of an authorized login interface from the second electronic equipment, wherein the display information of the authorized login interface is automatically acquired by the second electronic equipment. According to the display information of the authorized login interface, the authorized login interface is displayed in the first collaborative window, the authorized login interface comprises a first option, and the first option corresponds to an authorized login function. And receiving a first operation of the user in the first collaborative window, wherein the first operation is an operation on the first option. And in response to the first operation, logging in the first application program or the first website through the first account information.

The invention relates to a cable protective sheath and a cable. The cable protective sheath comprises a protective sheath body and a power source. One side, in contact with the cable, of the protective sheath body is used as an inner side and one side, away from the cable, of the protective sheath body, is used as an outer side. The protective sheath body includes a shielding layer, a conductive layer and an insulating layer that are laminated successively from the inside to outside; the conductive layer is electrically connected to the power source; and the output voltage of the power sourceis lower than the body safety voltage. In addition, the cable includes the cable protective sheath. Compared with the anti-rat anti-ant cable in the prior art, the provided cable protective sheath andcable have advantages of good anti-rat and anti-ant effects, high usage flexibility, and simple structure.

The invention relates to the technical field of steam turbine moving blade equipment, in particular to a moving blade design method, a moving blade and a steam turbine for driving an air separation compressor. The moving blade design method comprises the following steps that a moving blade is designed to comprise a blade root, a blade body and a shroud ring, and the blade body and the blade root serve as a base part; the wheel disc assembly is designed to comprise a wheel disc and a plurality of moving blades surrounding the wheel disc; keeping the basic part of the wheel disc assembly unchanged, continuously adjusting the parameters of the shroud ring, and solving the resonance rotating speed avoiding interval of the wheel disc assembly for avoiding the triple key points; and determining the moving blade design result as the moving blade corresponding to the wheel disc assembly until the target operation interval falls into the resonance rotating speed avoiding interval of the wheel disc assembly. The moving blade is designed according to a moving blade design method. A steam turbine driving the air separation compressor includes a rotor blade. The invention relates to a moving blade design method, a moving blade and a steam turbine for driving an air separation compressor. A shaped blade which only operates in a specific operation interval is improved into a universal blade which meets various operation intervals.

The invention relates to the technical field of refrigeration equipment, in particular to a refrigeration compressor shell, a refrigeration compressor and a refrigeration system. The refrigeration compressor shell comprises a shell body, wherein a compression cavity is defined by the shell body; the shell body is provided with a first inlet, a first outlet and a heat exchange runner, and the heat exchange runner and the compression cavity are located on the outer side and the inner side of the inner surface of the shell body correspondingly; the heat exchange runner is provided with a first end and a second end, the first end communicates with the first inlet, and the second end extends to communicate with the first outlet along a preset path relative to the first end. The refrigeration compressor comprises the refrigeration compressor shell. The refrigeration system comprises the refrigeration compressor. According to the refrigeration compressor shell, the refrigeration compressor and the refrigeration system, the heat exchange medium exchanges heat with the shell body and the refrigeration medium, so that the refrigeration medium can be at least subjected to heat regeneration, and the refrigeration compressor shell can also be used for cooling the refrigeration medium and a motor.

The invention relates to the technical field of small oil fume suction equipment, in particular to a volute-free air bellow and a desktop range hood. The volute-free air bellow is used for the desktop range hood and comprises a volute-free box body and an impeller arranged in the volute-free box body. The impeller is provided with an air inlet end and an air outlet end. The volute-free box body is provided with an air inlet and an air outlet. The air inlet faces the air inlet end, and the air outlet faces the air outlet end. The desktop range hood comprises a volute-free draught fan. According to the volute-free air bellow and the desktop range hood, on the premise that the air bellow effect equal to that of a traditional volute is achieved, abnormal noise generated when blades of the impeller pass through a volute tongue is eliminated, the noise peak value is reduced, the sound quality is improved, and accordingly the running noise of the desktop range hood applying the volute-free air bellow is reduced.

The invention relates to the technical field of supercritical working medium circulation, in particular to rotary mechanical equipment, a supercritical working medium recompression cycle power generation system and process. The rotary mechanical equipment comprises a turbine and a first compressor, wherein a driving shaft of the turbine and a transmission shaft of the first compressor are coaxially connected to form a first rotating shaft; and an inlet of the first compressor is opposite to an outlet of the turbine, or an outlet of the first compressor is opposite to an inlet of the turbine. The supercritical working medium recompression cycle power generation system involves the rotary mechanical equipment. The supercritical working medium recompression cycle power generation process adopts the power generation system. According to the rotary mechanical equipment, the supercritical working medium recompression cycle power generation system and process, the turbine and the first compressor are arranged in the mode that the axial thrust directions are opposite, the axial load borne by the first rotating shaft is effectively reduced, the operation reliability and safety are improved,and the rotary mechanical equipment has the advantages of being simple and compact in structure and high in acting power.