37results about How to "Reduce turbulence noise" patented technology

An inlet duct, an induction system, and a system are disclosed for directing an inlet flow into an inlet compressor for use in an internal combustion engine. An example inlet duct may include one or more relief features disposed on an inner surface of the inlet duct. The one or more relief features may be made integral with the inlet duct. The one or more relief features may be disposed to protrude into the inlet flow to cause the inlet flow to swirl before reaching the inlet compressor.

The invention discloses a novel multi-blade centrifugal fan. The novel multi-blade centrifugal fan comprises a volute, a volute tongue and a plurality of fan blades fixed in the volute, wherein one lateral side of the volute tongue is fixed on the inner lateral side of the air outlet of the volute, the other lateral side of the volute tongue is a concave face, a plurality of air guide grooves are formed in the concave face, the two end faces of each fan blade are arc-shaped faces, a zigzag structure is arranged on one arc-shaped face of each fan blade, a bionic non-smooth structure is arranged on the other arc-shaped face of each fan blade, and airflow sequentially passes the bionic non-smooth structures and the zigzag structures and then is discharged from the air outlet of the volute. The novel multi-blade centrifugal fan has the advantages that the air quantity and air pressure of the fan are increased effectively, the noise of the fan is lowered effectively, and the efficiency of the fan is increased effectively.

A double deck elevator comprising an upper cage and a lower cage vertically movable together in a hositway, wherein a space between the upper cage and the lower cage is covered by covers. The covers guide airflow flowing around the space to reduce air turbulence noise, and consequently the quietness and comfortableness in the cages is improved.

A passive cooling device 10 for removing waste heat from a component 50 is disclosed. The passive cooling device 10 includes a heat mass 11 and a stem 13 extending outward therefrom and including a plurality of fins 24 with stem slots SS therebetween. A plurality of vanes 21 that include fins 23 formed therein surround the stem 13 and define a chamber 30. A duct 90 connects with a top face 29 of the vanes 21 and an air flow source 70 that generates an air flow F through the chamber 30, the stem fins 24, the fins 23, and the vanes 21 to dissipate heat from the heat mass 11. The air flow source 70 can supply a positive FP or a negative FN air flow.

The invention discloses an efficient and environment-friendly automobile muffler and a sound elimination method thereof. The efficient and environment-friendly automobile muffler comprises an outer barrel body and a sound absorption cavity formed in the outer barrel body, wherein a perforated air inlet tube of which air hole arrays are distributed at the two ends is arranged in the sound absorption cavity; an air inlet cavity baffle plate is arranged in the middle of the perforated air inlet tube; with the air inlet cavity baffle plate adopted as the boundary, the sound absorption cavity is divided into an air inlet cavity surrounded by first-grade foamed aluminium sound absorbing boards, and a middle cavity surrounded by second-grade foamed aluminium sound absorbing boards; and a middle cavity outer barrel is arranged at the outer parts of the second-grade foamed aluminium sound absorbing boards in a sleeving manner. According to the muffler structure, gases need to pass through multi-level damping loops composed of the perforated air inlet tube, the first-grade foamed aluminium sound absorbing boards, the second-grade foamed aluminium sound absorbing boards, the movable baffle plate, and the like, so that gases with higher kinetic energy are enabled to flow through more loops, the turbulent noise is effectively reduced, and a relatively high sound elimination capacity is achieved.

Adding dome-shaped protuberances, or polydomes, to an engine system increases the structural integrity of the engine component to which they are added and allows noise radiated in the engine system to be reduced in certain regions of the frequency spectrum without incurring a significant increase in the mass of the engine part to which they are added, which may result in a longer solidification time during the mold injection process. The size and spatial arrangement of polydomes relative to one another can be further adjusted to reduce noise within the engine system and polydomes may be reinforced with ribs to increase the structural stiffness of plastic engine components. Because plastic engine components are created using an injection mold process during the manufacturing process, added surface features (e.g. polydomes and ribs) are continuous with the underlying planar surface to which they are added.

The invention discloses a scroll compressor with an enhanced cooling function. The scroll compressor comprises a shell and a motor, the motor is arranged in the shell, and a first cavity is formed between the motor and one end of the shell; and the scroll compressor further comprises a flow guide plate, the flow guide plate is arranged in the first cavity, the flow guide plate is fixedly connected with one end of the shell, at least one flow guide channel is formed in the flow guide plate, and the flow guide channel makes contact with one end of the shell. According to the scroll compressor, the flow guide plate is arranged to intensively cool one end of the shell, so that the reliability of a control part is improved.

Provided is an adjustable air director. The adjustable air director comprises an air director body, an air guiding ring, a sealing strip, studs and nuts, wherein the air guiding ring and the sealing strip are arranged on the studs of the air director body in a sleeved mode, and then are fastened through the nuts. The adjustable air director is installed on a radiator of a power system arranged between a radiator and an engine, and can guide or change the flow field of air flowing through the radiators and a cooling fan, air turbulence noise caused by rotation of the cooling fan is lowered, assembly and adjustment of the power system, maintenance of a complete machine, and replacement of the cooling fan or belts are facilitated, and the heat dissipation capacity of a cooling system is well ensured.

The invention provides a fan assembly and a communication device. The fan assembly comprises a housing for containing an axial fan, wherein the axial fan of a fan assembly is arranged within the housing when arranged. In addition, the housing is further connected with an air guide cover, the air guide cover is provided with an air inlet, and a rectifying grid is arranged in the air inlet of the air guide cover. In use, non-uniformity on a plane of airflow entering from the air inlet creates a strong vortex, thereby increasing axial flow fan broadband and narrow-band noise. Through the arrangedaxial fan, the air supply amount can be increased, air inlet air guide and flow equalizing functions can be realized by the rectifying grid, so that turbulence noise of the fan assembly in the air inlet can be reduced, and the noise of the whole axial fan can be reduced. Moreover, the rectifying grid is arranged in the air inlet, so that occupied space is reduced.

The invention discloses a high-air-flow low-noise vertical type mounting axial flow fan for a comprehensive pipe rack. The fan comprises an air cylinder, a motor, a hub and blades, the motor is fixedly connected to the interior axis of the air cylinder trough connecting plates, the hub is fixedly connected to an output shaft of the motor, the blades are fixedly connected to the side wall of the hub, the axial flow fan further comprises an air outlet flow equalizing noise elimination guide blade, the air outlet flow equalizing noise elimination guide blade is located at one end of the air cylinder, through the air outlet flow equalizing noise elimination guide blade at one end of the air cylinder, before an air flow generated in the fan flows out of the air cylinder, the air flow firstly flows through the air outlet flow equalizing noise elimination guide blade, a part is a dedicated noise elimination device customized and designed according to the flow and the pressure energy magnitudeof the pneumatic property, a main material comprises a galvanized steel sheet, a galvanized silenced perforated plate and a noise elimination cotton material, the flow equalizing guide blade is madeof the galvanized silenced perforated plate and the noise elimination cotton material, and the sound power noise of the air flow flowing through the fan can be efficiently reduced.

The invention provides an air outlet device. The air outlet device comprises a hub; the fan blades are arranged on the hub, and the fan blades are arranged in a double-end symmetrical wing shape. The fan blades are arranged to be in a double-end symmetrical wing shape, so that when the fan blades are driven by external force to rotate in different rotating directions, the symmetrically-arranged fan blades are the same in blade shape in different windward directions, it is guaranteed that the pneumatic states of the fan blades are the same when the fan blades rotate forwards and backwards, and the air outlet amount of the two sides of the hub is effectively balanced when the fan blades rotate forwards and backwards; and the blowing requirements can be met in two directions during forward and reverse air outlet.

A Coanda-effect-based air-conditioned plant roof air-film cooling apparatus comprises Coanda wing plates, an arc upper cover, connection blocks, end plates, an air box, a draught fan and a bottom plate; the Coanda wing plates are arranged above the bottom plate below the lateral edges of the arc upper cover, one end of each Coanda wing plate is provided with an arc guide head, the arc upper cover is connected with the arc guide heads through the connection blocks, a special-shaped air outlet is arranged between the arc upper cover and each Coanda wing plate, the Coanda wing plates, the arc upper cover, the end plates and the bottom plate form an air outlet cavity, the air box is mounted on the bottom plate, a static cavity and a draught cavity are arranged in the air box, the draught fan is mounted in the draught cavity, and the bottom plate is provided with an air hole communicated with the static cavity. Exhausted air from an air-conditioned plant is supplied out of narrow slits of a Coanda-effect-based air guidance unit and flows along Coanda surface, the air around the roof is guided under low volume, air film is finally formed on the outer surface of the roof, the air film attaches to a wall at high speed, heat may be brought away sufficiently, and the temperature of the outer surface of the roof is reduced.

The invention discloses a draught fan system. The draught fan system comprises a volute and an impeller arranged in the volute, and an air inlet is formed in the volute. The draught fan system is characterized in that a flow guiding device used for guiding airflow into the air inlet is arranged at the position, adjacent to the air inlet, outside the volute; when an air outlet of the volute faces upwards, one point passing through the axis of the impeller is taken as a first center, a coordinate system is established by taking the first center as an original point, in the coordinate system, a horizontal line passing through the first center is taken as as an X axis, a vertical line passing through the first center is taken as a Y axis, the side, opposite to the air outlet of the volute, ofthe X axis is taken as the forward direction, and the upward direction of the first center is taken as the forward direction of the Y axis; and the flow guiding device is positioned in a second quadrant of the coordinate system. The invention further discloses an extractor hood with the above draught fan system and a control method of the extractor hood.