187results about How to "Reduce airflow noise" patented technology

A dust collection unit for a vacuum cleaner includes a first filtering chamber filtering relatively large foreign objects, a second filtering chamber filtering relatively small foreign objects when air exhausted from the first filtering chamber is introduced into the second filtering chamber, an exhaust member disposed above the filtering chambers to guide airflow, a storing chamber disposed under the filtering chambers to store the foreign objects filtered in the filtering chambers, a sealing member sealing bottoms of the filtering chambers, and a rectifying unit formed on an exhaust side of the second filtering chamber to rectify airflow, thereby reducing noise generated by the airflow.

A draft inducer blower for high efficiency furnaces, including a blower housing which facilitates maximum air flow efficiency through the blower housing while reducing air flow noises. The blower housing generally includes a housing body and housing cover which define an exhaust transition therebetween, which transitions the air flow from the circular main cavity of the blower housing to the blower housing outlet. The housing body and housing cover are attached to one another via a lobed joint along the exhaust transition, and each include complementary, smoothly contoured inner surfaces to facilitate smooth air flow through the exhaust transition toward the outlet. Additionally, the housing body and housing cover include cooperating cutoff surfaces which form a broadly radiused cutoff within the blower housing to reduce or eliminate the blade pass noise associated with contact of the air flow from the impeller with the cutoff.

A motor vehicle headlamp includes numerous semiconductor light sources disposed in a matrix, which can be activated individually for emitting light, numerous primary lenses disposed in a matrix, allocated to the semiconductor light sources, for bundling the light emitted by the semiconductor light sources and for generating a primary light distribution on light exit surfaces of the primary lenses, and a shared secondary lens for projecting the primary light distributions as secondary light distributions onto a roadway in front of the motor vehicle, such that the secondary light distributions illuminate a high-beam region. To reduce the structural height of the secondary lens without losses in terms of efficiency, the motor vehicle headlamp includes a cylindrical lens having a cylinder axis disposed in the beam path of the light module between the primary lenses and the secondary lens that is oriented such that it is substantially horizontal.

A method and systems are disclosed for reducing fluid flow noise. The method and systems use a thermal mechanism to deploy a flap edge fence during landing and / or other operating conditions, and stow the flap edge fence during other operational conditions such as cruise. The flap edge fence is controlled passively by ambient temperature or actively by a controller based on temperature changes corresponding to various operating conditions.

The invention discloses an air conditioner. The air conditioner comprises a machine body, an air guiding plate and a driving device, wherein an air outlet is formed in the machine body; the air guiding plate comprises a first air supply section and a second air supply section, and the first air supply section and the second air supply section are hinged to each other; the driving device is arranged on the machine body, and the driving device drives the first air supply section and / or the second air supply section to rotate so as to change an included angle between the first air supply section and the second air supply section. According to the air conditioner disclosed by the embodiment of the invention, the turbulence of air flow is not easily generated during refrigerating and heating, and the noise of the air flow is low.

The invention discloses an energy-saving defrosting air source heat pump system, relates to a heat pump system, and solves the problems that the existing air source heat pump adopts reverse cycle to defrost so as to influence indoor comfort, when a four-way reversing valve reverses, the four-way reversing valve leaks, so that the property of the system is reduced, the safety operation of the heat pump is influenced, hot-gas bypass is adopted to defrost, the defrosting time is long, and the safe operation of a compressor is influenced. The energy-saving defrosting air source heat pump system comprises a compressor, a four-way reversing valve, an indoor machine, a filter, a first throttling device, an outdoor machine, a gas-liquid separator and a second throttling device, wherein the outlet of the compressor is communicated with the four-way reversing valve, and the four-way reversing valve is respectively communicated with the indoor machine and the outdoor machine; the energy-saving defrosting air source heat pump system comprises a thermal storage heat exchanger, a first magnetic valve, a second magnetic valve, wherein the thermal storage heat exchanger comprises a thermal storage sleeve, a heat exchanging pipe and a phase-change material, the inner surface of the thermal storage sleeve is covered on the compressor, and the four-way reversing valve is connected with the first magnetic valve and the second magnetic valve. The energy-saving defrosting air source heat pump system provided by the invention is used for defrosting the air source heat pump system.

A dust collection unit for a vacuum cleaner includes a first filtering chamber filtering relatively large foreign objects, a second filtering chamber filtering relatively small foreign objects when air exhausted from the first filtering chamber is introduced into the second filtering chamber, an exhaust member disposed above the filtering chambers to guide airflow, a storing chamber disposed under the filtering chambers to store the foreign objects filtered in the filtering chambers, a sealing member sealing bottoms of the filtering chambers, and a rectifying unit formed on an exhaust side of the second filtering chamber to rectify airflow, thereby reducing noise generated by the airflow.

In a vehicle air conditioner, two foot openings are provided in right and left wall portions of a case, and are opened and closed by two foot doors, respectively. Each door surface of the foot doors is moved along a surface of the right and left wall portions for opening and closing the foot openings. A face opening is provided in a top wall part of the case to be opened an closed by a face door. An operation locus of the foot doors is overlapped with that of the face door when being viewed from a direction perpendicular to the door surface of the foot door, while the face door is operated between the foot doors to have a clearance between the face door and each foot door.

A mower capable of reducing noise generated by rotation of a cutter blade is provided. A mower is provided with an upper cutter blade and a lower cutter blade (15) inside a housing. The lower cutter blade has a wing portion (42) and a wing chamfered portion (51). The wing portion overhangs upward from a second rear end portion (47) of the lower cutter blade on an opposite side in a rotational direction, at both end portions (45) in a longitudinal direction. The wing chamfered portion is chamfered so that a wing outer end portion (53) of the wing portion is inclined from an upper surface to a lower surface.

The invention discloses an air conditioner indoor unit. The air conditioner indoor unit comprises a shell body, a heat exchanger and at least two centrifugal fans. The shell body is provided with an air inlet and at least two air outlets. At least two spaced air channels are limited in the shell body. The at least two air channels are in one-to-one correspondence with the at least two air outlets and communicated with the air inlet and the corresponding air outlets respectively. An air tunnel penetrating through the shell body is formed in the shell body. The heat exchanger is arranged in the shell body. The at least two centrifugal fans are arranged in the at least two air channels respectively to drive external air to enter from the air inlet and blow out from the corresponding air outlet after being subjected to heat exchange with the heat exchanger. The air tunnel is located between the air outlets of the at least two air channels, and the air blowing out from the at least two air outlets forms negative pressure on the front side of the air tunnel to drive the air on the rear side of the air tunnel to flow on the front side of the backward part of the air tunnel. According to the air conditioner indoor unit, the attenuation degree of air volume is small, air is sent farther, and the structure is simpler.

A draft inducer blower housing for high efficiency furnaces, including a housing body and housing cover which define an exhaust transition therebetween, which transitions the air flow from the circular main cavity of the blower housing to the blower housing outlet. A cutoff portion of the blower housing is formed as an insert member or third housing component, which is located within a recess defined within the housing body proximate the outlet. The cutoff insert member may be attached to the housing body and captured between the housing body and housing cover, and includes a broadly radiused cutoff portion defining the exhaust cutoff of the blower housing. The housing body includes reduced-height mounting lugs, and indentations provided in the outer wall of the housing body above each mounting lug. The reduced height mounting lugs reduce the amount of material needed to form the housing body, and allow the use of shorter fasteners to secure the blower housing to the wall of a furnace. The indentations in the outer wall of the blower housing facilitate easier access to the openings of the mounting lugs during installation of the fasteners.

The invention discloses an air-conditioner and an air feeding device thereof. The air feeding device of the air-conditioner comprises a housing and a guide plate. An air outlet duct is defined inside the housing, an air hole penetrating the housing in the forward-backward direction is formed in the housing, and an annular air blowing nozzle communicating the air hole and the air duct is formed on the circumferential wall; the guide plate is arranged inside the air vent and formed in a an arc shape and enclose at least a part of the outer circumferential wall of the air hole. According to the air feeding device of the air-conditioner, by enclosing at least a part of the outer circumferential wall of the air hole, the arc-shaped guide plate can divert airflow inside the air slowly to achieve rectification of the airflow and enable the flow direction of the airflow to be more uniform and easier, so that air capacity losses and airflow noise can be reduced. The air feeding device of the air-conditioner is small in the air capacity losses, low in airflow noise and simple in structure.

A rotor blade assembly is provided having an airflow modifying element for suppressing airflow noise caused by a drain hole. The rotor blade assembly includes at least one rotor blade including a body shell extending between a blade root and a blade tip. Further, the rotor blade includes at least one drain hole having a diameter. The drain hole is configured within the body shell of the rotor blade. At least one airflow modifying element is configured on the body shell a predetermined distance from the drain hole such that the airflow modifying element reduces airflow noise caused by the drain hole. In one embodiment, the predetermined distance is substantially equal to the diameter of the drain hole.

The invention provides a built-in spiral cyclone separator, comprising a handle, an airflow inlet, a dust collection barrel, an upper cover, an air outlet formed at one side of the lower part of the round dust collection barrel, a cyclone chamber formed in the round dust collection barrel, a crescent exhaust chamber, a dust collection chamber, and a filtration sponge in the exhaust chamber. The cyclone chamber is formed by the space between the inner wall of the round dust collection barrel and the bent side wall of the round dust collection barrel; the cyclone chamber is internally provided with a spiral staircase, wherein the lower end of the spiral staircase is connected with the airflow inlet and rises spirally; one end of the cyclone chamber is enclosed by a baffle while the other end forms a dust falling opening at the top of the spiral staircase; the crescent exhaust chamber is formed by the space between the side wall and a separation wall, the curvature of the separation wall is less than that of the side wall and the two ends of the separation wall is connected with the side wall, and a plurality of outer meshes are arranged on the side wall; the dust collection chamber is formed by the other space of the dust collection barrel; and the airflow inlet is formed at the lower part of the dust collection barrel and is tangent to the wall of the dust collection barrel. The built-in spiral cyclone separator reduces the airflow noise and eliminates the harsh shriek, and has the advantages of compact and simple structure, high separation efficiency, large dust collection amount, and simple and easy operation.

The invention provides an engine cover structure and a dust collector. The engine cover structure comprises an engine cover and a motor. The engine cover is in the dust collector, and is a closed loop air duct surrounding out of a motor of the dust collector. The motor is arranged in the engine cover, and is used to drive airflow from a dust cup of the dust collector to flow to external environment through the closed loop air duct. Through the above technical scheme, the engine cover is provided with more available space, and on the premise of small space occupation, length of the air duct of the engine cover is increased, and airflow noise is eliminated in the closed loop air duct of the engine cover, so that performance of the dust collector is greatly improved.

The invention discloses an automobile fuel tank valve function testing device which comprises a gas source device, wherein the gas source device is connected in series with a positive pressure tank, a negative pressure tank, an accumulator tank and a fuel tank valve in sequence; the positive pressure tank and the negative pressure tank are connected in parallel; the accumulator tank and the fuel tank valve are connected in parallel; a gas outlet of the gas source device is respectively connected with gas inlets of the positive pressure tank and the negative pressure tank; gas outlets of the positive pressure tank and the negative pressure tank are connected with a gas inlet of the accumulator tank; a gas outlet of the accumulator tank is connected with a gas inlet of the fuel tank valve; a valve intake pressure sensor and a valve intake flow quality sensor are arranged on the gas inlet of the fuel tank valve; a valve gassing pressure sensor and a valve intake flow quality sensor are arranged on the gas outlet of the fuel tank valve; the fuel tank valve is fixed on a rotatable testboard. According to the automobile fuel tank valve function testing device, the positive pressure tank, the negative pressure tank, the accumulator tank and the testboard are connected and coordinated skillfully, so as to collect the analytical pressure and flow quantity data. Therefore, the opening pressure, closing pressure and reversed closing angle of the fuel tank valve can be obtained accurately, and whether the fuel tank valve function being tested is qualified or not can be judged.

The invention provides an expansion valve control method and device and an air conditioner. A up-to-temperature shutdown opening of an expansion valve is preset in the air conditioner, the expansion valve control method comprises the steps that when the opening of the expansion valve is reduced to a first opening value according to the obtained up-to-temperature shutdown instruction and the expansion valve operates for the first duration with the first opening value, the opening of the expansion valve is reduced to a second opening value from the first opening value, the first opening value isgreater than the up-to-temperature shutdown opening, and the second opening value is less than the up-to-temperature shutdown opening; operating data corresponding to the operation of the air conditioner with the second opening value are obtained; and if the operating data of the air conditioner meet the preset conditions, the opening of the expansion valve is restored to the up-to-temperature shutdown opening to enable the air conditioner to be maintained in a shutdown mode. In the way, airflow noise of the air conditioner can be effectively reduced or eliminated in the whole shutdown mode so as to avoid the impact on the experience of users.

A blower fan includes a shroud, a hub for guiding airflow being discharged, and a plurality of blades disposed between the shroud and the hub. A first outer diameter of a first portion, which is close to the hub, of the blade is different from a second outer diameter of a second portion, which is close to the shroud, of the blade.

The invention relates to the field of air conditioners and discloses a local air supply system based on a bed. The local air supply system based on the bed comprises an upper air supply bellows, a lower air supply bellows, the bed, an upper air supply outlet, a lower air supply outlet, an air pipe connector, an air pipe and a three-way valve. The bed has the certain height and divides a room to be an upper local space and a lower local space which are different in use function, wherein the upper local space is an upper sleeping area and the lower local space is a lower working area. By selecting different air conditioner air supply branches or supplying air to the upper air supply bellows, the temperature of air of the upper sleeping area of the bed is controlled; or by supplying air to the lower air supply bellows, the temperature of air of the working area is controlled. The upper air supply outlet and the lower air supply outlet are respectively provided with a guide device, so that the air conditioner wind airflow direction is adjusted within the large range. According to the local air supply system based on the bed, hot wind of an air conditioner under the heating operating condition in winter can be conveyed to the lower layer indoors, so that not only is the thermal comfort of the air conditioner improved, but also heat energy gathered at the upper layer indoors in winter can be utilized, and the energy-saving type local air conditioner air supply system is flexible to adjust, remarkable in effect and large in air conditioner control area.

The invention relates to an induced draft channel structure of a rail traffic vehicle cab. The induced draft channel structure comprises a main air duct body, wherein an air inlet is formed in one end of the main air duct body, an air outlet is formed in the other end of the main air duct body, the air inlet is communicated with an air source treated by an air conditioning unit in a passenger carriage air duct, and the air outlet is connected with a cab ventilation unit through a pipeline; and the induced draft channel structure is characterized in that a guide plate is arranged in the main air duct, the guide plate allows a guide passage to be formed between the air inlet and the air outlet, the end of the guide passage, adjacent to the air outlet, is provided with a resistance plate perpendicular to the flowing direction of the wind, and one side of the resistance plate is provided with a static pressure cavity. The induced draft channel structure can effectively suppress the action of the dynamic pressure of the passenger carriage air conditioning unit and control the air volume sent into a cab.

A personal valve apparatus may include a nozzle, a valve seat, and a moveable poppet valve. The nozzle may comprise an inner air-flow surface having a nozzle cavity extending through the inner air-flow surface. The valve seat may comprise a seat member disposed at an end of the inner-air-flow surface with the seat member disposed over the nozzle cavity. The moveable poppet valve may be disposed over the seat member and the nozzle cavity. The moveable poppet valve may comprise a convex surface. When the moveable poppet valve is in an open position, the convex surface may be disposed over and apart from the seat member to allow air to flow from the nozzle cavity, against the convex surface, between the seat member and the convex surface, and beyond the seat member. The convex surface of the poppet valve may reduce air turbulence, drag, flow separation, and / or noise within the valve apparatus.

The invention provides an air conditioner, an axial flow fan and a stator blade of the axial flow fan. The stator blade of the axial flow fan comprises a blade body and a lug boss. Particularly, the blade body has a pressure surface and a suction surface. The pressure surface is concave. The suction surface is convex. The blade body is provided with a front edge and a rear edge. The lug boss is arranged at the rear edge of the blade body. The lug boss protrudes from the pressure surface of the blade body. The stator blade of the axial flow fan, provided by the invention, has the advantages that air flow at an air outlet of the axial flow fan can be straightened, the separation phenomenon generated at the air inlet of the axial flow fan can be prevented, trailing edge loss is reduced, and the purpose of reducing the kinetic energy loss of the air flow and the noise of the air flow are achieved.

Disclosed are a method for determining pitches of cooling pins for a pneumatic tire so that the heat dissipation performance of the sidewall may be improved and an airflow noise generated by a high speed air may be decreased, and a pneumatic tire including the cooling pins arranged by the same. The method for determining pitches of cooling pins for a pneumatic tire, including: selecting a total number of cooling fins, the number of pitch-types, and a size of each pitch; generating a random number and arranging each type of pitch sequentially by the generated random number to produce a random pitch arrangement; Fourier transforming the obtained pitch arrangement to calculate a result value (FT); and repeatedly performing the steps of producing a random pitch arrangement and calculating the FT to determine a pitch arrangement when a change in amplitude of the FT is smallest.

The invention relates to the field of motors and discloses a compressor and a permanent magnet motor thereof. The permanent magnet motor comprises a stator and a rotor, wherein the stator comprises a stator core and a stator winding; the stator core comprises multiple stator teeth, stator slots and a rotor containing part; the stator teeth are distributed in the peripheral direction of the stator at intervals; each stator slot is formed between two adjacent stator teeth; the rotor containing part is defined by inner end edges of the multiple stator teeth; the stator winding is arranged in the stator slots; the rotor can be rotationally arranged in the rotor containing part relative to the stator; the rotor comprises a rotor core; multiple magnet slots are formed in the rotor core in the peripheral direction at intervals; the rotor further comprises multiple magnetic parts which are respectively arranged in the multiple magnet slots; the distance between the rotation center of the rotor and an outer edge of the rotor containing part is Ris; the distance between the rotation center of the rotor and an outer edge of the rotor core is Ror; Ris-Ror is greater than or equal to 0.9 mm and less than or equal to 2.2 mm.

The invention provides a flow-mixing fan with sine type meridional flow channels. The flow-mixing fan with the sine type meridional flow channels comprises a motor, a machine case, an impeller, guidevanes and a flow collector. The guide vanes are coaxially and fixedly arranged on the inner side of one end of the machine case. The motor is arranged in the center of wheel hubs of the guide vanes. The output shaft of the motor is fixedly connected with the center of the impeller. The flow collector is arranged on the inner side of the other end of the machine case. The flow collector and the impeller are on the same side. The wheel hubs of the guide vanes and wheel hub of the impeller share the same diameter. According to the flow-mixing fan with the sine type meridional flow channels, the scheme is reasonable, and the structure is simple and easy to achieve; full play can be given to advantages of the flow-mixing fan; and in addition, the fan structure is compact, the air volume is large, noise is little, and static pressure efficiency is high.

A mixed flow fan comprises a motor, a casing, an impeller, guide vanes and a flow collector. The guide vanes are coaxially and fixedly arranged on the inner side of one end of the casing; the motor isarranged in the center of a hub of the guide vanes; an output shaft of the motor is fixedly connected with the center of the impeller; the flow collector is arranged on the inner side of the other end of the casing, and the flow collector and the impeller are on the same side; the hub of the guide vanes and the hub of the impeller have the same diameter. The variable concave-convex casing line provided by the invention is formed by tangency of a section of concave arc and a section of convex arc, so that the included angle between the inlet and the outlet and the rotating shaft is zero, meanwhile, a large diameter difference between the inlet and the outlet of the impeller can be ensured, and the airflow pressure is increased by fully utilizing centrifugal force. By the adoption of the design, the size of a non-acting area is reduced, airflow axially enters the non-acting area, energy is obtained in the impeller and converted into axial flow from inclined upward flow, then part of kinetic energy of the airflow is converted into pressure energy in the guide vanes, and airflow pressure is improved.

The invention provides an air conditioner low-temperature heating starting control method, an air conditioner and a storage medium. The air conditioner low-temperature heating starting control method comprises the steps that whether the outdoor environment temperature Tao is smaller than a first preset temperature T1 or not is obtained and judged; and if yes, a four-way valve of the air conditioner is controlled to conduct frequent switching with the preset duration t0 as a switching period. By frequently switching the four-way valve, a high-temperature and high-pressure gaseous refrigerant returns to a low-pressure side to enter a compressor, so that the temperature of the compressor is quickly increased; and meanwhile, lubricating oil mixed in the refrigerant quickly returns to the compressor, the oil discharge rate is reduced, and the operation reliability of the compressor is improved.

The invention relates to a straight pipe type silencer which comprises an outer cylinder, wherein an air inlet end plate is arranged at an air inlet end of the outer cylinder, a damping air outlet hole plate is arranged at the air outlet end of the outer cylinder, and a baffle with a through hole is arranged in the middle of the outer cylinder and divides the inside of the outer cylinder into an upper inner chamber and a lower inner chamber. The straight pipe type silencer is characterized in that a spherical damping hole plate and a planar damping hole plate are successively arranged in the lower inner chamber in the air flowing direction, an air guide pipe integrally positioned in the upper inner chamber is welded onto the baffle coaxially, one end of the air guide pipe is communicated with the lower inner chamber through the through hole in the baffle, the other end of the air guide pipe is closed, a group of silencing holes are formed in the lateral walls of the air guide pipe, and a silencing device is arranged outside the air guide pipe coaxially. The silencing device comprises an inner hole plate and an outer hole plate which are arranged between the air guide pipe and the outer cylinder coaxially, the space between the inner hole plate and the outer hole plate is filled with glass fiber cotton, and the space between the outer hole plate and the outer cylinder is filled with wave crest sound-absorbing sponge firmly adhering to the cylindrical surface on the inner side of the outer cylinder. The straight pipe type silencer has the advantages of being good in sound silencing and noise attenuation effect, high in exhaust speed and the like.

The invention discloses an air conditioner outdoor unit piping, a method for forming a damping material on the piping and an air conditioner outdoor unit.The air conditioner outdoor unit piping comprises an air suction pipe section and an exhaust pipe section, and the damping material which has the damping and denoising properties is formed on the outer surfaces of the air suction pipe section and the exhaust pipe section.According to the air conditioner outdoor unit piping, the method for forming the damping material on the piping and the air conditioner outdoor unit, due to the fact that the damping material which has the damping and denoising properties is sprayed on the outer surfaces of the air suction pipe section and the exhaust pipe section of the air conditioner outdoor unit, vibration of the air suction pipe section and the exhaust pipe section can be weakened, and noise caused by vibration is reduced; the piping design on the air suction pipe section and the exhaust pipe section is simple; meanwhile, airflow noise caused by refrigerant circulating in the air suction pipe section and the exhaust pipe section can be reduced, vibration and noise of the air conditioner outdoor unit can be reduced, and the refrigerating efficiency of the air conditioner outdoor unit is improved.