38results 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.

The invention provides a bowl-shaped internal and external circulation type air door, which is arranged in an air inlet box shell of an air conditioning cabinet in an automobile. The bowl-shaped internal and external circulation type air door comprises an air damper, two side plates and two rotating shafts, wherein the two side plates are arranged on the two sides of the air damper respectively; the two rotating shafts are arranged in the two side plates in a penetration way respectively, and can rotate to drive the two side plates and the air damper to rotate together; and a staggered grid is arranged on the side, which is away from the rotating shafts, of the air damper. According to the bowl-shaped internal and external circulation type air door, variable radius chamfers have stronger structural strength and higher stress relief resistant capability, can be used for better supporting the side plates of the air door, and are favorable for preventing the deformation of the air door, so that the risk that the air door is separated from the air inlet box shell is lowered; the design of the staggered grid can have a function of rectifying airflow at an inlet of the air conditioning cabinet, so that the problem that turbulence noise is easily produced when the air damper runs to a specific position is improved; and in addition, the staggered grid can also have a function of supporting and strengthening the air damper.

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 indoor air ventilation device based on the Coanda Effect. The indoor air ventilation device comprises a Coanda airfoil-shaped panel, an arc-shaped shield plate, a bottom plate, side plates, an air inlet barrel, an annular frame and a variable frequency fan, wherein the Coanda airfoil-shaped panel, the arc-shaped shield plate and the side plates are arranged on the bottom plate; the arc-shaped shield plate is arranged on the upper end, on which a flow guidance head provided with a smooth curve surface is arranged, of the Coanda airfoil-shaped panel; the two side plates are separately arranged on the two sides of the Coanda airfoil-shaped panel and the arc-shaped shield plate; an air inlet cavity is formed by the Coanda airfoil-shaped panel, the arc-shaped shield plate, the side plates and the bottom plate; a strip-shaped air outlet is formed between the arc-shaped flow guidance head of the Coanda airfoil-shaped panel and the arc-shaped shield plate; the air inlet barrel is arranged on the bottom plate, and is communicated with the air inlet cavity; the assembly height of the air inlet barrel is lower than that of the strip-shaped air outlet, so that noise which is generated when air flow flows out of the air inlet cavity is reduced; the annular frame is arranged in a barrel hole at one end of the air inlet barrel; and the variable frequency fan is arranged in the barrel hole of the air inlet barrel, and is fixed on the annular frame through screws.

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.

In a radial fan wheel for supplying cooling air for an electrical machine, with a number of fan blades (16) attached along the circumference of the fan wheel (10) that have arc-shaped blade ends (18), which, at their radially inner edge, enclose a first angle (β1) with a tangent (20) to the inner circumference (20) of the fan wheel (10) and at their radially outer edge, enclose a second angle (β2) with a tangent (22) to the outer circumference (24) of the fan wheel (10), the invention proposes that the second angle (β2) be selected to be 75% or more greater than the first angle (β1) in order to minimize the turbulence noise in the vicinity of the fan blades (16) during operation of the fan wheel (10).

The present invention provides a blower impeller which can restrain performance deterioration of air amount and increase of turbulence noise when light weight of the blades is obtained. The blower impeller of the invention is provided with a wheel hub 12 which is rotatably driven and a plurality of blades 13 that are configured to the periphery of the wheel hub 12 and radially extend from the wheel hub 12. The cross section at the side of a front edge 14 in the circumferntial direction of each blade 13 is wing-shaped. The cross section at the side of a back edge 15 in the circumferential direction of each blade 13 is a shape with a certain thickness.

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.

In a radial fan wheel for supplying cooling air for an electrical machine, with a number of fan blades (16) attached along the circumference of the fan wheel (10) that have arc-shaped blade ends (18), which, at their radially inner edge, enclose a first angle (β1) with a tangent (20) to the inner circumference (20) of the fan wheel (10) and at their radially outer edge, enclose a second angle (β2) with a tangent (22) to the outer circumference (24) of the fan wheel (10), the invention proposes that the second angle (β2) be selected to be 75% or more greater than the first angle (β1) in order to minimize the turbulence noise in the vicinity of the fan blades (16) during operation of the fan wheel (10).

The invention discloses a range hood. The range hood comprises a draught fan system, the draught fan system involves a volute and an impeller located in the volute, and a first air inlet is formed in the volute; the range hood further comprises an air intake device, and the air intake device comprises a first flow guide cover arranged opposite to the first air inlet; and the range hood is characterized in that the air intake device further comprises a partition tongue, the partition tongue is arranged outside the volute and adjacent to the first air inlet, the first flow guide cover and the partition tongue form a complete whole, an air intake duct is formed in the first flow guide cover and the partition tongue, the partition tongue can rotate relative to the volute so as to change the shape of the air intake duct, and a rotating shaft of the partition tongue is parallel to the axis of the impeller. The invention further discloses a control method of the range hood.

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.

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 fan assembly capable of reducing the fan noise comprises a fan and an air guide channel communicating with an air outlet of the fan, the thickness of the side wall of the air guide channel is larger than a preset value, and a first elastic structure is attached to the inner wall of the air guide channel. The invention also relates to a display device.

The present application provides a fan assembly and a communication device. The fan assembly includes a casing for accommodating an axial flow fan, and the axial flow fan of the fan assembly is arranged in the casing during installation. In addition, the casing is also connected with an air guide cover, and 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. When in use, the non-uniformity of the airflow entering from the air inlet on the plane will generate a strong vortex, thereby increasing the broadband and narrow-band noise of the axial fan. The air supply volume can be increased by setting the axial flow fan, and the rectification grid realizes the function of air inlet guide and flow equalization, thereby reducing the turbulent flow noise of the fan assembly at the air inlet, thereby reducing the noise of the entire axial flow fan. And the rectifying grid is set in the air inlet, which reduces the occupied space.

The invention provides a bowl-shaped internal and external circulation type air door, which is arranged in an air inlet box shell of an air conditioning cabinet in an automobile. The bowl-shaped internal and external circulation type air door comprises an air damper, two side plates and two rotating shafts, wherein the two side plates are arranged on the two sides of the air damper respectively; the two rotating shafts are arranged in the two side plates in a penetration way respectively, and can rotate to drive the two side plates and the air damper to rotate together; and a staggered grid is arranged on the side, which is away from the rotating shafts, of the air damper. According to the bowl-shaped internal and external circulation type air door, variable radius chamfers have stronger structural strength and higher stress relief resistant capability, can be used for better supporting the side plates of the air door, and are favorable for preventing the deformation of the air door, so that the risk that the air door is separated from the air inlet box shell is lowered; the design of the staggered grid can have a function of rectifying airflow at an inlet of the air conditioning cabinet, so that the problem that turbulence noise is easily produced when the air damper runs to a specific position is improved; and in addition, the staggered grid can also have a function of supporting and strengthening the air damper.

The invention discloses an air guide ring and an air conditioner outdoor unit, which relate to the technical field of refrigeration devices. The air guide ring and the air conditioner outdoor unit are invented to solve the problem of generation of turbulence noise since the edge of an air outlet of the air guide ring in the prior art generates whirl airflow. The air guide ring comprises an air guide ring main body; the air guide ring main body encircles to form an air guide duct, the air guide ring main body comprises an outer layer side wall and an inner layer side wall, an annular air guide groove is formed between the outer layer side wall and the inner layer side wall, one end of the annular air guide groove close to the inlet of the air guide duct is closed, and one end of the annular air guide groove away from the inlet of the air guide duct is open. The air guide ring can be used for guiding the airflows generated by an axial flow fan.

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 relates to a high-pressure cooling fan for a high-flow low-noise fuel cell vehicle, which includes a hub, fan blades, an outer ring and a wind protection ring, the hub and the outer ring are coaxially arranged, and the fan blades are fixed between the hub and the outer ring and rotate The axis is centered and distributed at equal intervals in the circumferential direction. The wind protection ring is arranged outside the outer ring. The fan blades include a plurality of two-dimensional blades. The two-dimensional blades are inclined at a certain blade installation angle. The two-dimensional blades The three-dimensional blade shape is projected onto the corresponding circumferential cylindrical section. The three-dimensional blade shape from the root to the tip of the fan blade is superimposed on the inner side of the outer ring along the set leading edge stacking line. The installation of each two-dimensional blade shape The relationship between the angle and the normalized radius of the cylindrical section of the two-dimensional airfoil is a polynomial function, and the normalized radius is the ratio of the radius of the cylindrical section of the three-dimensional airfoil to the radius of the cylindrical section at the blade tip of the fan blade. Compared with the prior art, the fan of the invention improves gas flow and effectively suppresses turbulent noise, and has low-noise and high-flow characteristics at high rotational speed.

The invention discloses a fan blade suitable for an axial flow fan with a front motor frame. The fan blade comprises a wheel rim and a plurality of blades which are evenly distributed on the peripheral face of the wheel rim and are of a three-dimensional twisted structure, wherein a plurality of pits which are arranged in a matrix mode are formed in a windward side of each blade, each row of pits are arranged in a flow direction at the same spanwise height, flow direction spacing S of each row of pits is equal, and spanwise spacings C between the rows are equal. According to the invention, the pits formed in the windward sides of the blades have the effect of a vortex generator, and low-speed areas are formed in the pits when airflow flows through the blades, so that thickness of a boundary layer of a pressure surface is increased, and outlet pressure of a fan is improved; and meanwhile, vortex structures are formed in the pits when the airflow flows through the pits, so that the turbulence energy level of the boundary layer is improved, the boundary layer is transited in advance, a large-scale vortex structure formed by streaming of a motor frame is favorably damaged, small-scale isotropic turbulence is formed, turbulence noise is reduced, flowing uniformity is improved, a flowing state of the fan is improved, and performance of the axial flow fan is further improved.

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.

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.