81results about How to "Reduce fan noise" patented technology

To provide a reliable high brightness and definition image display by inhibiting a possible increase in fan noise and promoting cooling of an upper, hot portion of a display panel module, various boards, and image processing electronic components, an image display includes a flat display panel module, a display surface side cover on a display surface side of the display panel module, a non display surface side cover on a non display surface side of the display panel module, a display driving board, a power supply board, and a cooling fan, wherein a case of the cooling fan is larger than a distance between the display panel module and the non display surface side cover in an area where the cooling fan is installed, and a first end of the case of the cooling fan closer to the non display surface-side cover is positioned above a second end of the case closer to the display panel module.

An air blower is provided with a drive motor and an air blowing fan which has a hub mounted to the drive motor and blades which are provided to the hub. The air blower is characterized in that serrations comprising triangle-shaped protrusions are provided to the front edge of each of the blades so as to be arranged along the front edge and in that the pitch, the height, or the direction of the serrations is changed according to the flow of air at a radial position on the air blowing fan.

The invention relates to a sound-proofed helicocentrifugal fan comprising a helicocentrifugal propeller (6) associated with a motor (5), housed in a casing formed by a central piece (1) and respective end pieces (2 and 3), which pieces are perforated with holes distributed over the entire surface except for the area around the propeller (6), a sound-absorbing blanket (8) being incorporated on said casing and an outer casing (7) being incorporated around the entire assembly.

A portable lighting apparatus includes an envelope which contains a frame supporting an illuminating device typically an electric light bulb inside the envelope. The envelope is mounted on a telescopic mast supported by a movable base element incorporating stabilising legs. The envelope may be inflatable or rigid. For an inflatable envelope, various sensors are provided for sensing deformation of the envelope and / or pressure in the envelope including a photosensor. A means to supply air or other gas to inflate the envelope are provided. A rigid envelope formed from two conjoined sheets of acrylic deformed into dome shapes is also disclosed which overcomes many of the problems of inflatable envelopes particularly, their slow inflation rate, the tendency to deform due to air currents and the adverse effect of punctures. Although a fan is not required for inflation of the rigid envelope fan forced air is preferred for cooling the electric light bulb.

A centrifugal fan has a circular main plate driven and rotated by a motor rotary shaft, a plurality of blades fixed to an outer circumferential portion of the main plate and spaced apart at predetermined intervals in a circumferential direction of the main plate, and a side plate attached to ends of the blades opposite to the main plate. An air inlet port is formed at the center of the side plate. The side plate inclines outward in centrifugal directions from the air inlet port and has an arcuate cross section with a predetermined radius of curvature. A dead water region reducing space is formed between the blades and the side plate. The dead water region reducing space forms a smooth flow between the two surfaces of each blade, bringing about desirable blade performance.

An acoustic panel liner includes a face sheet, back plate, and liner core positioned therebetween, which may be used in an engine nacelle. Elongated chambers contain variable amounts of septa at a calibrated depth or depths. The septa may have varying DC flow resistance. The chambers may have a hexagonal or other polygonal cross sections. The septa, such as mesh caps, may be bonded to an inner wall of a corresponding chamber. The insertion depths may be the same or different. If different, the pattern of distribution of the depths may be randomized.

This invention prevents a deterioration of efficiency of a power supply apparatus due to a semiconductor power supply voltage drop, prevents an increase in wasted power, and prevents erroneous operations due to feeder wire voltage drop. In the mounting structure of electronic circuits having a plurality of busbars as current paths on a printed circuit board, the plurality of busbars have almost parallel portions spaced a predetermined distance apart; a span of the parallel portions of the plurality of busbars is greater than the predetermined distance; and in the parallel portions of the plurality of busbars, the plurality of busbars are connected by a wiring pattern. In the switching power supply apparatus built on a printed circuit board, with its output voltage of less than 2 V and its output current of more than 100 A, a means is provided for making the power efficiency higher than 70%.

The invention provides a method for accurately controlling the rotating speed of a fan and relates to the field of system heat dissipation. The method comprises the steps that difference values of actual temperatures read by a plurality of sensors and a preset temperature are simultaneously calculated and compared, the fan PWM capable of meeting the need for heat dissipation of all monitored heat emitting points at the same time is determined through certain mathematical calculation, and finally the PWM is transmitted to the fan through a mainboard to achieve the real-time monitoring and quick feedback control over the rotating speed of the fan.

A fan of an aircraft engine is provided with a rotating fan rotor for feeding air aftward as a spiral flow and a stator vane for rectifying the spiral flow to be an axial flow. The fan stator vane is provided with a hub end portion extending radially relative to a rotating axis of the fan rotor and a tip end portion leaning toward a suction side. Leading edges of the hub end portion and the tip end portion have sweepback angles of from 27 degrees to 33 degrees relative to a radial direction defined by the rotating axis.

An HVAC system having a main circuit and a subcooler circuit. The main circuit includes a main circuit evaporator, a main circuit expansion device, a main circuit condenser and a main circuit compressor connected in a closed refrigerant loop. The subcooler circuit includes a subcooler evaporator, a subcooler expansion device, a subcooler condenser and a subcooler compressor connected in a closed refrigerant loop. The subcooler evaporator is arranged and disposed to exchange heat between liquid refrigerant in the main circuit and the refrigerant in the subcooler circuit to cool the liquid refrigerant in the main circuit prior to entering the main circuit evaporator. The operation of the subcooler circuit provides an increased cooling capacity per unit of a mass flow of cooling fluid through the main circuit condenser and subcooler condenser for the HVAC system with a predetermined design efficiency.

A fan system with enhanced air flow-static pressure characteristics and reduced fan noise compared to the related art is provided. The number of duct blades of a duct is the same as the number of stationary blades of an axial flow fan located in front of the duct, and the duct blades correspond to the stationary blades respectively. An end surface of a rear end portion of each stationary blade and an end surface of a front portion of a duct blade corresponding to the stationary blade have the same shape, and they align together and contact each other to form one composite stationary blade, with a discharge port of each axial flow fan communicating with an inlet port of a duct housing located behind the axial flow fan.

An optical device and a projector having the optical device is provided, which have a liquid-crystal display having, on an exit side, a first exit polarizer plate and a second exit polarizer plate arranged thermally insulated from each other and separated in an optical axis direction, the first exit polarizer plate being bonded on a first heat conductor plate which is bonded on an incident surface of a color-combining optical unit while the second exit polarizer plate is bonded on a second heat conductor plate held by a polarization-plate holding frame. By heat release through respective independent routes, it is possible to suppress the deterioration due to the temperature rise on the exit polarizer plates and liquid-crystal display.

The described embodiments relate generally to control of rotational components in a computer system. In one embodiment, the rotational component includes a cooling fan, the cooling fan being controlled in accordance with data tailored to reduce the acoustic noise produced by the cooling fan. In one embodiment, the cooling fan is operated with non-uniform pulse width modulated signals. The non-uniform pulse width modulated signals can be a function of desired rotation speed and can include fundamental and harmonic components.

A fan has an air conveying conduit (16) and a fan wheel (22) arranged therein, which wheel is rotatable about a central axis (25) and is formed with a central hub (20; 120) having an outer periphery (27) on which fan blades (26) are mounted. These extend with their radially outer rims (40) as far as a surface (17) that is substantially coaxial with the central axis (25) and delimits the air conveying conduit (16) externally. The blades (26) have a profile similar to an airfoil profile. A flow element (42) is provided along the radial outer edge (40) of a fan blade and serves as an obstacle to a compensating flow proceeding around that radial outer edge (40) from the delivery side to the intake side, and likewise has, in cross section, an airfoil profile.Adjacent the front edge (28) and rear edge (36) of a blade (26), it has substantially the same outline as the adjacent part of the associated blade (26), and in a middle region (48) between the front and back edge is wider, by an approximately constant amount, than the adjacent part of the blade (26).

A pet grooming tool, for use with a furry pet such as a dog or cat having loose hair and non-loose hair, is adapted for removing the loose hair from the pet. The grooming tool comprises a sharp edged comb with short tines mounted in front of an atrium open near the comb, and is also connected to a suction hose attached to a vacuum cleaner or similar.The comb is drawn through the pet's hair where it pulls loose undercoat and guard hairs, fleas, ticks, dander, and other items out of the animal's fur. When the tines are full, the comb is tipped on its trailing side and passed over a stripping pad or the animals hide. This pulls the hair mass out of the tines and deposits it at the entrance of the suction nozzle from whence it is whisked away by vacuum to a collection chamber.

In the invention, stator blades are arranged in such a manner that respective intervals between the adjacent stator blades (SV) become unequal at least partly. If the stator blades are arranged as mentioned above, there are formed wave fronts having different moving directions and phases, and these wave fronts are interfered with each other so as to be attenuated. Accordingly, an interference noise is reduced. Therefore, in accordance with the invention, it is possible to reduce an interference noise without enlarging a rotor stator blade interval as well as reducing a used amount of a sound absorption material.

A heat dissipation device which is pre-built with an air vent structure uses primarily a plurality of cooling fins, which are formed into different lengths, to assemble into the heat dissipation devices of different shapes, for shunning away from other elements inside a computer host. In addition, diversion baffles of a different angle can be arranged and assembled, so as to form air ducts following an angle of wind direction, allowing an air flow to be smoothly guided in by a fan, and to quickly flow into a heat transmission zone in a gap between the cooling fins, such that a heat source can be dissipated more quickly.

A brushless DC fan motor capable of communicating with an external apparatus while simplifying the circuitry. A speed control command generator, which generates a command for controlling the rotational speed of the rotor, include a microcomputer (9a) capable of bi-directional communication with an external apparatus (1) by serial communication based on a predetermined communication protocol. The microcomputer (9a) operates the speed control command based on control conditions transmitted from the external apparatus (1) and a signal indicative of the rotational speed and / or the exciting current detected by a speed detector (13) and / or a current detector (15) incorporated in the brushless DC fan motor (1). A drive circuit (7) controls the exciting current by PWM control according to an optimal speed control command.

A mixed flow fan assembly uses induced reverse ambient air flow through the in-line motor enclosure for motor cooling, motor segregation from primary exhaust contamination, and augmentation of volumetric flow rate. Induced ambient airflow through openings in and / or around the base of the fan housing balances low pressure around the fan wheel and the inlet cone to inhibit primary exhaust recirculation and increase volumetric flow rate. Guide vanes downstream of the fan wheel are used to axially reorient radial and tangential velocity components of primary effluent flow. The geometry of the fan assembly is optimized to minimize exhaust gas recirculation and maximize overall efficiency.

A fan system with enhanced air flow-static pressure characteristics and reduced fan noise compared to the related art is provided. The number of duct blades of a duct is the same as the number of stationary blades of an axial flow fan located in front of the duct, and the duct blades correspond to the stationary blades respectively. An end surface of a rear end portion of each stationary blade and an end surface of a front portion of a duct blade corresponding to the stationary blade have the same shape, and they align together and contact each other to form one composite stationary blade, with a discharge port of each axial flow fan communicating with an inlet port of a duct housing located behind the axial flow fan.

An optical device and a projector having the same is provided, which has a liquid-crystal display 400 having, on an exit side, a first exit polarizer plate 920 and a second exit polarizer plate 934 arranged thermally insulated from each other by separated in an optical axis direction, the first exit polarizer plate 920 being bonded on a first heat conductor plate 926 bonded on an incident surface of a color-combining optical unit 500while the second exit polarizer plate 934 being bonded on a second heat conductor plate 936 held by a polarization-plate holding frame 904, whereby, by heat release through respective independent routes, it is possible to suppress the deterioration-due to the temperature rise on the exit polarizer plates and liquid-crystal display.

Provided is a method for controlling a magnet type fan clutch, by which method engine performance, fuel efficiency, engine life, vehicle acceleration capability and other properties of a magnet type fan clutch can be further improved and its fan noise can be further reduced. This method is adopted for controlling a magnet type fan clutch which includes a magnet coupling, an electromagnetic clutch combined with the magnet coupling to control the on / off switching of the magnet coupling, and a fan attached to the magnet coupling. The control method is characterized in that the electromagnetic clutch is turned on or off based on at least one signal of temperatures of radiator coolant, engine oil and transmission oil, a vehicle speed, a rotational speed of an engine, compressor pressure of an air conditioner, and an on / off signal of the air conditioner, etc., so as to control the rotation of the fan.

A battery cooling structure which cools a battery equipped on a vehicle, the battery cooling structure including: a fan sending an air to cool the battery; and a sound insulation wall including a sound insulation material which insulates noise wherein the sound insulation wall faces an exhaust outlet of the fan.

Provided is a method for controlling a magnet type fan clutch, by which method engine performance, fuel efficiency, engine life, vehicle acceleration capability and other properties of a magnet type fan clutch can be further improved and its fan noise can be further reduced. This method is adopted for controlling a magnet type fan clutch which includes a magnet coupling, an electromagnetic clutch combined with the magnet coupling to control the on / off switching of the magnet coupling, and a fan attached to the magnet coupling. The control method is characterized in that the electromagnetic clutch is turned on or off based on at least one signal of temperatures of radiator coolant, engine oil and transmission oil, a vehicle speed, a rotational speed of an engine, compressor pressure of an air conditioner, and an on / off signal of the air conditioner, etc., so as to control the rotation of the fan.

A noise-reducing fan system, comprising a motor, a fan body, a plurality of magnetic-inducing elements, a magnetic field generator and a noise-reducing sound source device, is provided. Here, the fan body is mounted on the motor. The fan body comprises a plurality of blades, on which the plurality of magnetic-inducing elements are disposed, respectively. The magnetic field generator, which may generate a magnetic field, is employed for driving the plurality of magnetic-inducing elements to vibrate the plurality of blades and generate a vibration sound, so that at least one portion of the noise emitted from the fan body as rotating may be counterbalanced. The noise-reducing sound source device is disposed on a predetermined position and may send out a noise-reducing sound, so that the noise-reducing sound may counterbalance at least the other portion of the noise emitted from the fan body as rotating.

The present invention provides a fan motor capable of achieving both an improvement in a self cooling function of the fan motor and a reduction in fan noise, and of preventing the occurrence of heat damage, problems, and the like caused by external radiation heat and by self-heating, fan noise, and deterioration in fan performance and in fan efficiency. The fan motor (1) includes: a shroud (2); a motor (3) secured to and supported at the shroud (2); an axial-flow fan (4) connected to a rotation shaft part of the motor (3); and a heat shield panel (5) mounted at the rear side of the motor (3) with a gap being provided therebetween, in which the heat shield panel (5) has a spatula-shaped air guiding part (52) projecting outward in a radial direction at at least one location on an outer circumference portion; and the air guiding part (52) has a width gradually reducing toward an outer side and a fan-rotational-direction leading edge part (53) having an arc shape.

A system and method for reducing fan noise by controlling the drive current to the fan motor. In one embodiment the system approximates a linear drive using a number of transistors in parallel and sequentially deploying the transistors. In another embodiment, a scheme is used to activate and deactivate transistors in discrete steps thereby achieving the benefits of the linear controller topology.

A home cooking appliance includes a housing, a cooking compartment in the housing, a flue in the housing and in fluid communication with the cooking compartment for exhausting flue gases from the cooking compartment, an exhaust outlet for exhausting the flue gases from the housing, and a flue boundary connecting the flue and the exhaust outlet, the flue boundary separating flue gases from cooling air flowing through the housing and preventing dilution of flue gases with cooling air. The housing includes a cooling rough-in box having a cooling air flow channel for cooling the rear wall of the flue boundary. The cooling rough-in box includes an opening permitting the cooling air to be drawn into the cooling air flow channel from an exterior of the housing by convection owing to heat on the rear wall of the flue boundary.

An apparatus and method are provided for facilitating the cooling of engine coolant flowing through a radiator operatively connected to the engine of an engine-driven, electrical generator set. The engine has a crankshaft rotatable about a first axis and a radiator having a first side directed towards the engine and a second side. The apparatus includes a fan positionable on the second side of the radiator that is rotatable about a second axis generally parallel to and vertically spaced from the first axis. The apparatus includes a thermally responsive clutch having a driven portion. The clutch is movable between a first disengaged position wherein the driven portion is isolated from the crankshaft and a second engaged position wherein the driven portion rotates in unison with the crankshaft in response to a predetermined temperature. A fan drive system interconnects the driven portion of the clutch and the fan for translating rotation of the driven portion to the fan.

The present invention provides a fan motor capable of achieving both an improvement in a self cooling function of the fan motor and a reduction in fan noise, and of preventing the occurrence of heat damage, problems, and the like caused by external radiation heat and by self-heating, fan noise, and deterioration in fan performance and in fan efficiency. The fan motor (1) includes: a shroud (2); a motor (3) secured to and supported at the shroud (2); an axial-flow fan (4) connected to a rotation shaft part of the motor (3); and a heat shield panel (5) mounted at the rear side of the motor (3) with a gap being provided therebetween, in which the heat shield panel (5) has a spatula-shaped air guiding part (52) projecting outward in a radial direction at least one location on an outer circumference portion; and the air guiding part (52) has a width gradually reducing toward an outer side and a fan-rotational-direction leading edge part (53) having an arc shape.