73results about How to "Reduce rotational noise" patented technology

The invention provides an electric heating device. A radiating fin component comprises a flow-inlet surface adjacent to a connecting surface; and the flow-inlet surface of the radiating fin component is an inclined surface and is intersected with the central line of a heating pipe to form an inclined angle. The invention also provides an air conditioner. The electric heating device is positioned beside a bending position of an evaporator and is arranged in an air-inlet area of a ventilating device. Therefore, the structure of the radiating fin of the electric heating device is improved, the resistance of the electric heating device to air flow is reduced, the interference noise of the electric heating device to the air conditioner is reduced, meanwhile, rotary noise between a cross-flow blade of the ventilating device and the electric heating device is reduced, the total heating noise of the air conditioner is reduced by about 2dB (A), the noise performance of the air conditioner is improved, and the tone quality of the air conditioner during running is improved.

The technological process of making wing type centrifugal vane wheel includes the steps of: making the profile with single layer of boss and planar, arc or conic surface in ribbed hollow aluminum section bar with unequal wall thickness and wing, forming slots on the flat front and back disc and arc or conic front disc, inserting, bending and connecting to form vane wheel. The technological process has no welding and no limitation in vane number, and the produced vane wheel has high efficiency, low noise, small size and low cost.

A heat-resistant noise-reduction grease and a bearing containing the grease for a small motor such as a motor for imaging equipment such as a blower fan and motor bearing for a household electrical appliance such as an air conditioner, which is eco-friendly and excellent in noise-reduction properties is provided.The heat-resistant lithium grease composition is composed of 5 to 20% by weight of a thickener and 95 to 80% by weight of a base oil, wherein long-chain fatty acid lithium soap with 26 to 32 carbon atoms and lithium soap comprising a higher fatty acid with 10 to 20 carbon atoms and / or a higher hydroxyfatty acid with one or more hydroxyl groups and 10 or more carbon atoms are used as the thickener, and the base oil contains, as a main component, polymer ester oil (A) in which 8 or more ester groups are arranged in comb tooth form on one side of chain molecules of oil constituted with 8 or more carbon atoms, which is expressed by the following general formula:(where each of R1, R2, R3 and R4 represents an alkyl group, x represents an integer satisfying x≧2, and y represents an integer satisfying y≧2).and the base oil has a viscosity (40° C.) of 30 to 100 mm2 / s.

The invention relates to a transverse-flow fan for the wall room unit of the air conditioner, in which a plurality of blades is fixed on a disk to make above-mentioned each blade incline a certain angle to the central shaft of the disk, and meanwhile the mounting space of the said blades presents an unequal one and the angle included between the two adjacent blades and the central shaft of the disk is distributed randomly between 9~11deg. to form a section of the impeller with several blades. Several sections of above-mentioned impellers are firm-jointed to a needed length and two ends are sealed to form the transverse-flow fan of the invention.

The invention discloses an air conditioner outdoor unit with an inclined centrifugal fan and an air conditioner and relates to the air conditioner technical field. The air-in and air-out directions of the air conditioner outdoor unit can be changed; the influence on outdoor environment is reduced; and air-in and air-out angles are made to be wider; the heat exchange performance of the air conditioner outdoor unit is improved. The problems of the big influence on the outdoor environment, the small air supply volume and the low efficiency of an air conditioner outdoor unit in the prior art are solved. The inclined centrifugal fan comprises an upper hub, a lower hub and vanes arranged between the upper hub and the lower hub. The tops of the vanes are connected with the upper hub, and the root portions of the vanes are connected with the lower hub. The edges, close to the circle centers of the upper hub and the lower hub, of the vanes are the air-in edges of the vanes, and the edges, far away from the circle centers of the upper hub and the lower hub, of the vanes are the air-out edges of the vanes. The side, close to the lower hub, of the inclined centrifugal fan is the air-in side; the side, close to the upper hub, of the inclined centrifugal fan and the outer sides of the air-out edges are air-out sides. The diameter of the lower hub is bigger than the diameter of the upper hub.

The invention relates to the field of ventilation equipment, in particular to an injection molding centrifugal fan blade for an air conditioner. The injection molding centrifugal fan blade comprises a base plate, a hub, a plurality of blade bodies and an outer ring. The outer side of the hub and the inner side of the base plate are connected into a whole. The bottom ends of the blade bodies and the base plate are connected into a whole. The outer ring and the outer side walls of the tops of the blades are connected into a whole. The hub is provided with a plurality of material saving openings. The base plate is provided with 4-10 material saving holes. Not all the blade bodies have the same central angle. The air inlet end of each blade body is provided with a plurality of tooth-shaped notches. A plurality of bumps are arranged on the backpressure face of each blade body. The inner side end of the top of each blade is provided with an arc chamfer. The injection molding centrifugal fan blade for the air conditioner has the advantages that the structure is novel, and the base plate cannot deform during injection molding; the initial unbalance of the fan blade is adjusted, so that the product weight and cost are not increased, and noise is low.

The invention relates to a centrifugal fan which comprises a fan frame, wherein the fan frame comprises a convergence part, a first frame body and a second frame body which are connected with the convergence part; the first frame body and the second frame body are respectively arranged at two sides of one end of the convergence part; the other end of the convergence part forms an air outlet; a first containing space is formed in the first frame body; a second containing space is formed in the second frame body; a first fan wheel is arranged in the first containing space; a second fan wheel is arranged in the second containing space; the first frame body is provided with a first notch communicated with the convergence part; the second frame body is provided with a second notch communicated with the convergence part; and the air flow generated by the first fan wheel and the air flow generated by the second fan wheel are converged by the convergence part, and exhausted to the outer side of the centrifugal fan through the air outlet.

The invention relates to a centrifugal blower volute of a range hood. A molded line of the volute (1) consists of a first curve AB, a second curve BC, a log spiral CD and a straight line DE which are in smooth transition connection with each other, and the first curve AB and the second curve BC which form a volute tongue are front edge parts of a wing profile molded line, wherein the first curve AB is the front edge part of a wing profile upper airfoil molded line BAF, the second curve BC is the front edge part of a wing profile lower airfoil molded line BCF, and the upper airfoil molded line BAF and the lower airfoil molded line BCF form the wing profile molded line. The centrifugal blower volute uses the wing profile front edge parts with good streamline forms as the molded lines of the centrifugal blower volute tongue. The volute adopting the wing profile volute tongue can greatly reduce the probability of generating flow separations and back flows at the volute tongue and reduce impact losses, and is favorable for improving the wind quantity, the wind pressure and the efficiency of a centrifugal blower and reducing aerodynamic noises.

A laser marker / pointer for projecting circular or elliptical laser beam patterns onto a target surface such as a portion of a presentation screen or to assist in the aiming of a firearm, comprises a handheld shell body in which is mounted a laser light source, a rotating optical mirror driven by a motor, and an electronic drive circuit, whereby the aspect ratio of the marking pattern is determined by the geometric relationship of the motor shaft axis, the laser beam, and the mirror surface. The motor drive circuit when initially powered (along with the laser diode), applies full power (a continuous DC voltage to the motor to overcome inertia), followed by a pulsed voltage to lower the duty cycle of the motor, increase battery life, and reduce rotational noise.

A shroud includes a ring portion (210) surrounding a radial outer rim of an axial flow fan (100) for blowing air, and an air introducing part (220), for introducing air to the ring portion (210), enlarged from the ring portion (210) towards upstream in the airflow. The fan is located opposite to a heat exchanger (1) positioned upstream of the fan (100) in the airflow, and a center of the ring portion (210) is eccentric with respect to a center of the air introducing part (220). In the shroud, an airflow regulating plate (221) protrudes toward an upstream side of the airflow and forms a circular arc shape concentric with the ring portion (210) within a larger-area part (220a) of the air introducing part (220), which is formed due to the eccentrically located ring portion (210). Therefore, the first noise component of fan rotation noise can be effectively reduced without reducing an air amount passing through a heat exchanger.

In a multi-blade fan for an air-cooled engine, by defining the inlet angle β1 and the angle β′2 to make the sum thereof less than 80° (preferably defining β1 as 32° and β′2 as 36°), the multi-blade fan achieves greater air volume than in the case where the sum is made 80° or greater, where β1 is the angle between the relative velocity direction and the peripheral direction on the inlet side of the blades,β2 is the angle between the relative velocity direction and the peripheral direction on the outlet side of the blades, and β′2 is the difference obtained by subtracting β2 from 180°. The number of blades can therefore be reduced to realize lower noise level while still maintaining the same air volume as the prior art multi-blade fan.

A motor having more magnets on effective area of the rotor includes a stator, a rotor and a rotation shaft, the rotor has a plurality number of rotor magnetic poles, a magnet is installed inside each of rotor magnetic pole, and a concave arc is on the outer side of each magnet and forms the first, the second and the third surfaces near inside of each magnet. The concave arc connects to the first and the third surfaces with a connecting plan respectively, each connecting plan nears the periphery surface of the rotor. The motor has more magnets on the effective area of the rotor for higher motor efficiency.

A mining combined local fan with a tandem cascade comprises a collector (1), a pre-silencer (2), fan power, a two-stage main set and a silencing diffuser section (10). A two-stage impeller of a primary fan, a two-stage impeller of a secondary fan and two groups of guide blades are serially connected to form a four-stage series fan. By the aid of the tandem cascade and a combined series structure, airflow separation is suppressed, aerodynamic noise of the fan is reduced, and total pressure of the fan is increased. The fan runs at the rotation speed of a four-pole motor, rotation noise of the fan is effectively reduced, the sound level A of the fan is reduced by about 10dB according to detection, and wind pressure and flow of a two-pole motor in running are achieved. A contra-rotating axial flow integrated structure is reserved, a flow channel of the fan is kept smooth, and the running efficiency of the fan is improved. Motor shells directly contact with airflow in the flow channel, the motors are cooled by the airflow generated by the fan, temperature rise of the motors is reduced, the service lives of the motors are prolonged, and running safety of the fan is ensured.

The invention provides a fan structure, a fresh air device and an indoor unit of an air conditioner. The fan structure comprises a volute assembly and blades, wherein the volute assembly is provided with a first air inlet and a first air outlet; the blades are disposed in the volute assembly, and are used for sucking gas into the volute assembly from the first air inlet and discharging the gas through the first air outlet; the shell of the volute assembly is provided with a plurality of air outlet holes, so that part of the gas in the volute assembly flows out through the plurality of air outlet holes. The fan structure of the present invention solves the problems of excessive noise and small air output in the fan structure of the prior art.

The invention discloses a fast denoising blower fan comprising a spiral case and an impeller, and a second impeller; the impeller and second impeller are staggered; a worm tongue is arranged between the spiral case and the air outlet; the worm tongue tip leans to the impeller; the air outlet end is screwed with a denoising barrel; 1 / 2 inner wall, close to the worm tongue, of the denosing barrel is provided with a first denoising member; the rest 1 / 2 inner wall of the denoising barrel is fixedly provided with a second denoising member; the distance between the highest point of the first denoising member and the denoising barrel inner wall is A; the distance between the highest point of the second denoising member and the denoising barrel inner wall is B, and A>B. The first denoising member can denoise high db rotation noises formed by fast airflow and the worm tongue; the second denoising member can denoise low db rotation noises; airflow layers of different speeds in the spiral case can be differentially treated, thus ensuring airflow in the air outlet to quietly and stably output.

The invention provides an air guide ring, used for air-conditioner outdoor unit, which includes side plate, top cover and axial-flow windwheel. Air-ducting ring includes: air-ducting ring body, which has the cavity of opening for upper and lower ends; multiple notches, which are arranged on the side wall of air-ducting ring body. And axial-flow windwheel is arranged in cavity, and side plate is arranged in the circumference of air-ducting ring body, and the upper port of side plate and air-ducting ring body are equipped with top cover. Air-ducting ring body, side plate and top cover define chamber jointly. The air guide ring provided by the invention, which has a plurality of slits formed on the side wall, forms a relatively closed cavity with the side plates around and the top cover, reducing the rotation noise of the axial flow fan by adopting the principle of resonance noise elimination of the perforated plate.

A lithium grease composition which can be sealed in a small motor bearing to reduce noise, composed of 5-20% by weight of a thickener and 95-80% by weight of a base oil, wherein said grease composition adopts lithium soap as the thickener, which is synthesized from lithium hydroxide and a higher fatty acid with 10 to 20 carbon atoms and / or a higher hydroxyfatty acid with one or more hydroxyl groups and 10 or more carbon atoms, and the base oil includes, as a main component, a polymer ester oil (A) in which 8 or more ester groups are arranged in a comb tooth form on one side of chain molecules constituted by eight or more carbon atoms which is expressed by general formula 1: (In the formula, each of R1, R2, R3 and R4 is an alkyl group, where x is an integer and x≧2, and y is an integer and y≧2.) and the base oil (40 C) has a viscosity of 25 to 80 mm2 / s.

The invention discloses a cross-flow wind wheel, a cross-flow fan and an air-conditioning indoor unit, wherein the cross-flow wind wheel includes a rotating shaft and an impeller mounted on the rotating shaft, and the impeller includes two end plates arranged in parallel, and a A plurality of blades correspondingly fixed to the two end plates, at least one of the end plates is fixed to the rotating shaft, the plurality of blades are distributed at intervals on a ring area around the axis of the rotating shaft, and the The number of leaves is a prime number. The technical scheme of the invention can reduce the rotation noise of the cross-flow wind wheel.

The invention discloses a low-noise fan for directional cooling. The low-noise fan comprises a fan frame which is of an overall spindle type cavity structure, wherein a plurality of ventilation slots are uniformly formed in the center of the fan frame in the circumferential direction; the slotting direction of each ventilation slot is matched with the rotation direction of the low-noise fan; the outlet end of each ventilation slot is communicated with a fan frame cavity at the center of the fan frame; a transmission bearing and a linkage rod for connecting a motor are arranged on one side of the fan frame; the center of the other side of the fan frame is connected with a vent pipe; an induced draft passageway is arranged inside the vent pipe; the inlet end of the induced draft passageway is communicated with the outlet end of the fan frame cavity; during the use, the outlet end of the vent pipe is connected to a target cooling component. According to the low-noise fan for directional cooling, the fan frame and fan blades are integrally designed and the rotation of fan blades of the traditional fan is replaced by the whole rotation of the fan frame, so that the local vibration caused by the mass eccentricity of the parts in the rotation process is reduced; the design of pipe induced draft is used, so that directional air supply effect can be realized, the local heat dissipation efficiency is improved and the blind spots of air supply on the blowing surface can be eliminated at the same time.

The invention provides a motor which at least comprises a base, a stator assembly and a rotor, wherein the base is provided with a shaft tube, and the shaft tube is provided with a peripheral wall; the stator assembly is combined with the shaft tube of the base and is provided with an assembling hole, a plurality of close fit parts are formed between the inner side hole wall of the assembling hole and the peripheral wall of the shaft tube, and an adjusting gap is respectively arranged between the close fit parts; and the rotor is provided with a central shaft which is rotatably combined with the shaft tube of the base. By means of the simple structural design of the adjusting gap, the problem that the shaft tube has high possibility of being excessively oppressed by the stator assembly issolved.

The invention relates to an air-conditioning accessory. A cross-flow fan comprises a steel shaft end wheel, a plurality of medium wind wheels and a rubber end impeller. The inner end of a middle discis provided with a circular groove. The rubber end impeller comprises a wheel disc and a rubber shaft sleeve assembly. The rubber shaft sleeve assembly is fixed at the middle of the wheel disc in an embedded mode. The diameter of the wheel disc is matched with the diameter of the circular groove. The front end of the wheel disc is welded to and fixed to the circular groove. The rubber end impelleris fixed in the circular groove in a medium disc of the medium wind wheel at the last end. The angles of the blade inclination angle of any adjacent blades are different. The angles of central anglesof the adjacent blades are different. The cross-flow fan has the advantages of being novel in structure, low in production cost, low in vibration, low in noise and natural in wind outlet sound.

The invention provides a centrifugal fan and an air conditioner with the centrifugal fan. The centrifugal fan comprises a hub (10), a base plate (20) and multiple vanes (30), wherein the base plate (20) is arranged on the hub (10) in a sleeved mode, and the multiple vanes (30) are arranged on the base plate (20) and are located on the outer side of the hub (10) in the circumferential direction. Each vane (30) comprises an edge section which is far away from the hub (10) and extends out of the base plate (20), wherein the edge section comprises a first surface (31) and a second surface (32) which is opposite to the first surface (31), a backpressure surface is formed by the first surface (31), a pressure surface is formed by the second surface (32), and the first surface (31) is provided with a first concave-convex structure used for weakening an eddy. By the adoption of the centrifugal fan, the problem that in the prior art, a centrifugal fan is high in noise is solved.

A starter motor for vehicle is provided to reduce the noise due to a stopping operation of an armature assembly by forming a magnet groove on a magnet opposite to a core. A starter motor for vehicle includes an armature assembly(10), a yoke assembly(20), a plurality of planetary gears, an internal gear, an overrunning clutch, a pinion gear, a lever, and a magnetic switch. The armature assembly(10) includes a core(11) having coils(22). The yoke assembly(20) is formed by connecting a plurality of magnets(22) to the outside of the armature assembly(10). The planetary gears are used for receiving the driving force of a driving shaft. The internal gear is installed at the outside of the planetary gears. The overrunning clutch is connected to the internal gear. The pinion gear is connected to the overrunning clutch. The lever is used for shifting the pinion gear. The magnetic switch is used for driving the lever. A magnet groove(90) is formed on an inner circumference of the magnet(22) opposite to an outer circumference of the core(11) in order to enlarge an interval between the inner circumference of the magnet(22) and the outer circumference of the core(11).

The invention discloses a wind engine volute of Europe-type kitchen ventilator, which can adsorb wind via two surfaces. Wherein, the edge of front cover plate (1) is formed by a straight line (AB), several arcs (BC, CD, DE, EF, FG, GH), a straight line (GH), several arcs (HJ, JK) and straight lines (KL, LA); the edge of back cover plate (2) is formed by a straight line (A'B'), several arcs (B'C, C'D', D'E', E'F', F'G, G'H'), a straight line (GH'), several arcs (H'J', J'K') and straight lines (K'L', L'A'); the ratio between the radius of edge (JK) at the volute tongue of front cover plate (1) and the edge radius of edge (J'K') at the volute tongue of back cover plate (2) is 8-18.5. Compared to present technique, the invention has different curves at the edges of front and back cover plats, to control the separation of airflow when passes through the volute to confirm high efficiency, and reduce the rotary noise.

A laser marker / pointer for projecting circular or elliptical laser beam patterns onto a target surface such as a portion of a presentation screen or to assist in the aiming of a firearm, comprises a handheld shell body in which is mounted a laser light source, a rotating optical mirror driven by a motor, and an electronic drive circuit, whereby the aspect ratio of the marking pattern is determined by the geometric relationship of the motor shaft axis, the laser beam, and the mirror surface. The motor drive circuit when initially powered (along with the laser diode), applies full power (a continuous DC voltage to the motor to overcome inertia), followed by a pulsed voltage to lower the duty cycle of the motor, increase battery life, and reduce rotational noise.

The invention discloses a counter-rotating fan. The counter-rotating fan comprises a first-stage impeller and a second-stage impeller which are coaxial and arranged in a spaced mode, the rotating directions of the first-stage impeller and the second-stage impeller are opposite, the first-stage impeller comprises a plurality of first blades distributed in the circumferential direction, the two sideedges, in the circumferential direction, of each first blade are a first front edge and a first rear edge correspondingly, the first front edges and the first rear edges are bent towards the rotatingdirection in the radial direction from inside to outside, the second-stage impeller comprises a plurality of second blades distributed in the circumferential direction, the two side edges, in the circumferential direction, of each second blade are a second front edge and a second rear edge correspondingly, and the second front edges and the second rear edges are bent towards the rotating direction in the radial direction from inside to outside. According to the counter-rotating fan, the efficiency of the counter-rotating fan is improved, and the rotating noise of the second blades is reducedwhile the pneumatic performance of the second blades is ensured.

The invention discloses a dual-blade denoising blower fan comprising a spiral case and a first impeller; a worm tongue is arranged between the spiral case and the air outlet; the air outlet end is connected with a denoising barrel; the 1 / 2 inner wall, close to the worm tongue, of the denoising barrel is provided with a first denoising member; the rest 1 / 2 inner wall of the denoising barrel is fixedly provided with a second denoising member; the distance between the highest point of the first denoising member and the denoising barrel inner wall is A; the distance between the highest point of the second denoising member and the denoising barrel inner wall is B, and A>B. The blower fan also comprises a stop flow ring; the first impeller is provided with a leakage flow gap right opposite to the bottom of the stop flow ring. The first denoising member can denoise high db rotation noises formed by fast airflow and the worm tongue; the second denoising member can denoise low db rotation noises; airflow layers of different speeds in the spiral case can be differentially treated, thus ensuring airflow in the air outlet to quietly and stably output.

The invention provides an electric heating device. A radiating fin component comprises a flow-inlet surface adjacent to a connecting surface; and the flow-inlet surface of the radiating fin component is an inclined surface and is intersected with the central line of a heating pipe to form an inclined angle. The invention also provides an air conditioner. The electric heating device is positioned beside a bending position of an evaporator and is arranged in an air-inlet area of a ventilating device. Therefore, the structure of the radiating fin of the electric heating device is improved, the resistance of the electric heating device to air flow is reduced, the interference noise of the electric heating device to the air conditioner is reduced, meanwhile, rotary noise between a cross-flow blade of the ventilating device and the electric heating device is reduced, the total heating noise of the air conditioner is reduced by about 2dB (A), the noise performance of the air conditioner is improved, and the tone quality of the air conditioner during running is improved.