33results about How to "Reduce airflow loss" patented technology

The invention discloses a centrifugal fan and a dust collector provided with the same. The centrifugal fan comprises an impeller and a pressure expander. The pressure expander is arranged on the periphery of the impeller. The pressure expander comprises a plurality of rows of blade sets arranged sequentially from inside to outside. Each row of blade sets comprises a plurality of blades arranged at intervals in the peripheral direction of the impeller. The blades in the multiple rows of blade sets correspond in a one-to-one correspondence mode. At least one row of blades, located on the inner side of the impeller, of the multiple rows of blade sets, deviates from the radial direction of the impeller. The included angles, between the blades in the multiple rows of blade sets and a datum line, from inside to outside are gradually decreased. The datum line is a line connecting the inner ends of the blades in the row, at the innermost side, of the multiple rows of blade sets and the center of the impeller. According to the centrifugal fan, by arranging the multiple rows of blade sets sequentially from inside to outside, the included angles between the blades of the multiple rows of blade sets and the datum line are gradually decreased from inside to outside, airflow can be forced to flow in the radial direction of the impeller, the number of procedures can be decreased, the airflow loss of the centrifugal fan can be reduced, and the efficiency of the centrifugal fan is improved.

The invention relates to a blast protection mixed flow blower for a ship. The blower comprises an air inlet, an axial flow motor, a centrifugal impeller, an inner barrel, an outer barrel, a back-positioned guide vane and an air outlet, wherein the centrifugal impeller is mounted to a motor shaft of the axial flow motor; the axial flow motor is mounted into the inner barrel; the inner barrel and the outer barrel are coupled via the back-positioned guide vane; the air inlet and the centrifugal impeller are cooperatively mounted to one end of the outer barrel; and the air outlet is mounted to the other end of the outer barrel. Through combining the air supply structures of traditional axial flow blower and centrifugal blower, the blast protection mixed flow blower for the ship meets the air quantity and air pressure requirements of the centrifugal blower, and possesses the advantage of installation flexibility of the axial flow blower, and is suitable to be used in ship equipment with high requirement.

The invention discloses a general gasoline engine, which comprises a general gasoline engine box body, two general gasoline engine cylinder heads and an upper air passage assembly, wherein the two general gasoline engine cylinder heads are connected with the general gasoline engine box body, the upper air passage assembly surrounds the outside of the general gasoline engine cylinder heads, and comprises a fan cover and a flow guide cover, and the flow guide cover and the fan cover are matched in an inserting connection mode and are used for forming a cooling air passage through which cooling air flows between the two general gasoline engine cylinder heads. Through the inserting and connecting type matching between the flow guide cover and the fan cover, the matching among all components is tighter, the sealing performance of the cooling space is improved, the airflow loss in the cooling space is reduced to the greatest degree, the heat radiation effect is ensured, and the integral structure is compact; in addition, the realization of the structure is simple, the operation is convenient, the dismounting, the mounting and the maintenance are easy, and the replacement is easy.

The invention relates to a brushless motor and an impeller thereof. The brushless motorcomprises a shell, a stator assembly, a rotor assembly, a rear cover, a front bearing, a rear bearing and an air duct system component, wherein the shell is provided with a stator assembly fixing block, the air duct system component comprises a fan cover and the impeller; the fan cover comprises a rear end part provided with a front bearing fixing block, and a front end part; the front end of the stator assembly is fixed on a first central through hole of the stator assembly fixing block of the shell; the rear bearing is arranged in a rear bearing chamber of the rear cover; the rear cover is fixed at the rear end of the shell; the front bearing is arranged in a front bearing chamber of the front bearing fixing block of the fan cover; the rear end part of the fan cover is fixed at the front end of the shell; and the rear end of a rotating shaft of the rotor assembly is inserted from an inner hole of the rear bearing, the front end of the rotating shaft penetrates through an inner hole of the front bearing, and the impeller is fixed to the front end of the rotating shaft and located in a first circular-truncated-cone-shaped containing cavity in the front end of the fan cover. The brushless motor has the advantages of high rotating speed, large suction force, small size, light weight, low noise, high efficiency and the like.

The invention discloses a dual-drive turbine, and belongs to the technical field of turbochargers. The dual-drive turbine comprises a turbine body arranged in a volute, an air inlet channel A and an air inlet channel B which are axially parallel are formed in the volute, the turbine body comprises a closed flow guiding face, a hub and a plurality of blades bent towards the same side, and the lowerends of the blades are fixed to the upper surface of the closed flow guiding face; and a flowing channel interval wall is arranged between the air inlet channel A and the air inlet channel B, a driving face A and a driving face B facing the hub are formed on the surfaces of the blades along air flows flowing out of the air inlet channel A and the air inlet channel B, the edge of the driving faceA abuts against the flowing channel interval wall, the air flow, flowing to the driving face A, of the air inlet channel A forms the air flow A, the air flow, flowing to the driving face B, of the airinlet channel B forms the air flow B, and the air flow A and the air flow B form dual-driving on the turbine. The air flow B can prevent a turbulent flow from being formed at the bottoms of the blades, and the driving force of the turbocharger and the working power of the turbine are increased.

The invention discloses a ventilating machine provided with a tight fitting type fan cover. The ventilating machine comprises a ventilating machine box body and two side cylinder heads connected with the ventilating machine box body and further comprises the fan cover and an air guide cover module penetrating through an airtight air channel and used for cooling the ventilating machine box body and the two side cylinder heads. Due to the fact that the edge peripheries of the air guide cover module and the fan cover form an airtight through cooling space through right fitting, the leakproofness of the whole cooling space is greatly improved, air flow loss in the cooling space is reduced, and heat dissipation effect is ensured. In addition, in the mode that the fan cover and the air guide cover module form the tight fitting structure, the ventilating machine is more compact in overall structure and capable of saving space.

The invention relates to a gas-leading sealing structure of a gas turbine. The gas-leading sealing structure comprises a shell, a flame barrel, a rotor and a turbine guider hollow blade, wherein an air compressor rotor and a turbine rotor are arranged on the rotor; compressed air channels are formed between the shell and the outer wall of the flame barrel as well as between the shell and the front wall of the flame barrel; and comb tooth sealing structures which are respectively positioned in front of the air compressor rotor, behind the turbine rotor, on the front wall and on the inner wall are arranged on the rotor. Compressed air in the invention can reach the comb tooth sealing structures through the channels and seals lubricating oil and the flame barrel which are arranged behind the air compressor rotor and the turbine rotor, so that the structural design of an engine is simplified and clear; the mass of the engine can be greatly reduced; and therefore, the push ratio optimization is greatly improved, the energy can be effectively saved, and cost can be reduced.

A method for manufacturing the intake manifold of electrojet engine includes blanking tube, bending by 180 deg., blanking metal sheet, die pressing, stretching shaping, making pressure-stabilizing box, binding the block with the pressure-stabilizing box, rivetting its periphery, welding the intake manifold to its seat, and welding the holder to the intake manifold. Its advantages are simple technology, good sealing, smooth airflow channel and less loss of airflow.

The invention provides a volute, a fan and a range hood and relates to the technical field of purification equipment. The volute comprises a coaming and two side plates; the coaming is connected between the two side plates to form an air flue together in an enclosing manner; each side plate is provided with an opening; at least one side plate is provided with a flow guide area; the bottom edge ofthe flow guide area is coincided with the bottom edge of the corresponding side plate; and the flow guide area is inclined inwards from top to bottom. The fan comprises an impeller, a drive device andthe volute; the impeller is installed in the volute; and the drive end of the drive device is connected with the impeller and is used for driving the impeller to rotate. The range hood comprises a box body and the fan; the box body is provided with a smoke suction hole and a smoke exhaust which are mutually communicated; and the fan is installed in the box body. The fan applying the volute is relatively high in performance in the running process and small in generated noise pollution.

The invention discloses an air suction silencer for a reciprocating piston type compressor. The air suction silencer comprises a silencing cavity, wherein an air inlet and an air outlet are formed in the silencing cavity, an inner inserting pipe with the two ends communicated with the air inlet and the air outlet correspondingly is arranged in the silencing cavity, and the silencing cavity comprises an expansion cavity and a resonant cavity which are separated; the two ends of the inner inserting pipe are arranged in the expansion cavity and the resonant cavity respectively, the first end located in the expansion cavity directly faces the air inlet or the air outlet, a distance is formed between the air inlet or the air outlet and the first end, and the resonant cavity comprises a first resonant cavity and a second resonant cavity which are separated; and a first silencing hole and a second silencing hole which are respectively communicated with the first resonant cavity and the second resonant cavity are formed in the pipe wall, positioned in the resonant cavity, of the inner inserting pipe, and the time required for airflow to flow to the first silencing hole and the second silencing hole along the inner inserting pipe is the same. According to the air suction silencer, the noise reduction capacity of the air suction silencer is improved while high air conveying efficiency is guaranteed.

The invention discloses an integrated efficient turbine with an air outlet constraint structure. The integrated efficient turbine comprises a turbine housing, wherein a turbine and an air outlet diversion trench are arranged in the turbine housing; the air outlet diversion trench is positioned at the air outlet end of the turbine housing, can increase the turbine rear pressure and improves the stability of turbine rear airflow; the initial end of the air outlet diversion trench is close to the turbine; the final end of the air outlet diversion trench extends towards the air outlet end of the turbine housing; and the external diameter of the air outlet diversion trench is gradually increased from the initial end to the tail end. The integrated efficient turbine has the advantages that the turbine front pressure is high, realization of EGR is facilitated, the turbine rear airflow is stable and the turbine is high in efficiency.

The invention relates to an enhanced spraying device of a cleaning and sweeping vehicle. The enhanced spraying device comprises a fan connecting pipe, a rear air pipe and a spraying pipe. According to the enhanced spraying device of the cleaning and sweeping vehicle, the air outlet of a fan of the cleaning and sweeping vehicle is guided to the position below the spraying pipe for assisting spraying, the air outlet airflow direction and the spraying direction can be controlled to be consistent all the time when the spraying incidence angle is adjusted, airflow loss is reduced, and the problems that the fixed spraying range of the cleaning and sweeping vehicle is limited and the spraying strength is poor are solved; the spraying effect of the cleaning and sweeping vehicle is effectively improved, and the application range of the cleaning and sweeping vehicle is widened.