48results about How to "Low operating noise" patented technology

A switched reluctance motor has a rotor and a stator. The stator has first and second stator magnetic pole groups sequentially placed in an axial direction of the rotor. First and second stator magnetic poles in each group are alternately arranged on a same circumference. The first stator magnetic poles are placed every electrical angle 2π and reversely magnetized to each other. The second stator magnetic poles are placed every electrical angle 2π and reversely magnetized to each other. The first magnetic pole is apart from the second magnetic pole by electrical angle π. Each stator magnetic pole in the first stator magnetic pole group is apart from that in the second magnetic pole group by electrical angle π / 2 in the circumferential direction.

An airflow control system for a blower providing the combustion air for an HVAC system comprises a single phase AC blower motor driving a blower wheel within a blower housing, a vacuum sensor mounted to the housing to sense the vacuum or pressure differential created by the blower as it operates, and a controller that receives as its only feedback signal a variable signal from the vacuum sensor which signal is proportional to the sensed vacuum within the housing and provides an output voltage to the blower motor to adjust the blower motor speed to thereby preferably produce a constant air flow.

The invention discloses a feeding device. The feeding device comprises a jig, a rack, a first conveying mechanism and second conveying mechanisms, wherein the first conveying mechanism comprises a conveying driving assembly and a bearing guide assembly which are arranged on the rack, the bearing guide assembly comprises a bearing conveying piece and a guide rail which are arranged on the rack and are in parallel with each other, the jig loaded with a workpiece is born by the bearing conveying piece and is in sliding fit with the guide rail, and the conveying driving assembly is associated with the jig or the bearing conveying piece to drive the jig to move along a direction in parallel with the guide rail; at least one clamping station is distributed on the rack along a direction in parallel with the guide rail, any clamping station is correspondingly provided with a second conveying mechanism, each second conveying mechanism comprises a turnover assembly and at least one clamping assembly which are arranged on the rack, the clamping assembly is connected to the turnover assembly, an avoiding part which is distributed along the pivoting direction of the clamping assembly and is used for avoiding the turnover action of the jig is arranged at the clamping station on the guide rail, the clamping assembly is provided with an auxiliary guide rail corresponding to the avoiding part, and the jig is in sliding fit with the auxiliary guide rail.

A modular gear train mechanism with an internal motor includes a hollow casing with an opening, a flywheel, a motor, a fixing gear, a rotating gear and a top cap sealing the opening. The flywheel is mounted between the interior of the top cap and the interior of the casing. A first and a second planet gears are mounted on the exterior of the flywheel pivotally. The motor received in the flywheel has a rotor shaft on which the flywheel is mounted pivotally. The fixing gear is fixed in the flywheel and engages with the first planet gear. The rotating gear is connected to an inner wall of the top cap and engages with the second planet gear. When the rotor shaft turns, the rotating gear is driven to turn and drive the top cap to turn synchronously. Accordingly, the present invention has a reduced volume and is easily used.

Provided is an actuator manufactured using a material obtained by mixing a film material featuring stable motion and high speed of response and used for ion conductive polymer actuators with conductive fine particles. According to the present invention, an actuator which is light in weight, produces low operating noise, and can be used safely and stably, and at the same time, produces expansion / contraction motion, and has speed of response comparable to that of a natural muscle can be obtained.

An illumination system adapted to be used in a projection apparatus is provided. The illumination system includes a solid-state light source group, a cooling module, and an ion fan. The cooling module is thermally coupled to the solid-state light source group. The cooling module is located on a path of a forced convection air generated by the ion fan. Moreover, the invention further discloses a projection apparatus including the aforementioned illumination system, and the projection apparatus avails prolonging a life time of the illumination system, and the ion fan does not have a magnetic shearing sound of a motor and a wind shearing sound of fan blades to avail reducing an operation noise of the illumination system.

The invention relates to a diagonal fan having a housing, an impeller driven by an electric motor whose hub together with an air conduction sleeve surrounding the impeller defines an essentially annular flow channel having an air intake opening and an air exit opening. The hub takes the form of a truncated cone that widens towards the air exit opening, the air conduction sleeve being essentially profiled, the electric motor being held in the housing by means of bridges that essentially extend in a radially outwards direction. The invention is characterized by the fact that the bridges to secure the motor are arranged in the region of the air intake opening of the flow channel.

The invention relates to a household garbage smashing, winnowing and compressing transportation car. The household garbage smashing, winnowing and compressing transportation car comprises a car chassis which is provided with a garbage collecting and compressing tank, an automatic charging device, a garbage can and a smashing and winnowing device; the garbage collecting and compressing tank is arranged on the tail portion of the car; the garbage can and the smashing and winnowing device are arranged between the head portion and the tail portion of the car; the automatic charging device used for grabbing a roadside garbage can is connected with the side edge of the car chassis below the garbage can; and the smashing and winnowing device used for smashing and classifying the garbage is connected with the garbage can and the garbage collecting and compressing tank. The household garbage smashing, winnowing and compressing transportation car has the beneficial effects that the garbage pretreatment function of garbage smashing and plastic thin film winnowing is achieved, the garbage is stored in different bins after being classified, the sealing performance is good, secondary pollution cannot be caused, the garbage smashing and compressing loading capacity is high, the automation level is high, loading and unloading are safe and reliable, and the work efficiency is high.

The invention discloses a hollowed cast-in-place pile hole forming structure of a rigid rock stratum water grinding drill and a construction method. The structure comprises a rock core and a walling crib; the walling crib is positioned at the outer periphery of the rock core; a coating layer is coated on the inner wall of the walling crib; hollowed discs are distributed in the walling crib according to the depth of a pile; a lap of pile hole ring is arranged on a single disc; the pile hole ring comprises multiple core drilling holes; two adjacent core drilling holes are intersected, and the outer sides are tangential to the inner wall of the walling crib; the rock core in the core drilling holes is cut through the water grinding drill to form a free face; and then, a central rock body is hollowed. The method comprises such steps as construction preparation, positioned lofting, pile hole locking, pile hole hollowing, rock slag discharge, pile hole control, pile hole correction and pile hole acceptance. The hollowed cast-in-place pile hole forming construction process applying the water grinding drill efficiently finishes the foundation construction of piles with various specifications, effectively controls the influence on surrounding dense complicated environments and commercial downtowns by the construction, guarantees safe and smooth engineering construction, and achieves excellent economic benefit and social benefit.

A sludge concentration-dehydration-drying integrated treatment plant and a treating method thereof are disclosed. The integrated treatment plant includes a sludge concentration device and a sludge deep-dehydration device. The sludge concentration device includes a wedge-shaped filter screen and a rotating first spiral shaft. The wedge-shaped filter screen includes a low-concentration sewage filtration segment, a sludge concentration segment and a sludge extruding segment. The first spiral shaft includes a central shaft, a first rubber ring and a first spiral blade. The sludge deep-dehydration device includes a spiral conveying-extrusion integrated machine and an extruding dehydrating chamber. The spiral conveying-extrusion integrated machine includes a second spiral blade, a conveying shell and a second spiral shaft varying in pitch. The extruding dehydrating chamber includes a left filtration plate, a right filtration plate and a middle filtration plate. The left and right filtration plates adopt the middle filtration plate as an axis and expand outward or close inward. The integrated treatment plant overcomes problems of the prior art that water contents after sludge treatment are high and a running cost is high.

The invention discloses a cleaning car single-engine system and a cleaning car thereof. The cleaning car single-engine system comprises an engine, a generator, an AC / DC controller, a DC / AC controller, an upper loading controller, a driving motor, a clutch and a transmission; the generator and the clutch coat an output shaft of the engine in sequence; the engine drives the generator to generate electricity; the output shaft of the engine is connected with the transmission through the clutch; an output end of the generator is connected with the AC / DC controller; the AC / DC controller is connected with the DC / AC controller through a direct-current high-voltage wire; an output end of the DC / AC controller is connected with the driving motor through a three-phase wire; an output end of the driving motor is connected with loading equipment; and the upper loading controller is respectively connected with the AC / DC controller and the DC / AC controller through CAN buses. The invention adopts the single-engine system, so that the whole car oil consumption is reduced, and the emission is reduced; and an upper loading system has a relatively independent and stable power source, so that the safety is high.

A light-weight pneumatic massage apparatus with low operation noise is provided. This apparatus includes a pneumatic massage device (12) and a pump (142) separated from the massage device. The apparatus further includes electromagnetic valves (20, 96) for controlling supply and discharge of pressurized air to and from air chambers (16A to 16H) of the pneumatic massage device (12), respectively. Each of the electromagnetic valves includes a displaceable valve member (46) having an armature (74), and a solenoid (44) for attracting the armature to move the displaceable valve member when a voltage is applied to the solenoid. The apparatus further includes an electromagnetic valve control unit (150) which controls a voltage supplied to the solenoid to open the electromagnetic valves such that the voltage increases from V1 to V2 gradually with the passage of time T1. The armature is attracted onto the end surface of the solenoid within the time period T1. Then, in a state in which the voltage is reduced to V3, the armature is maintained attracted onto the solenoid to keep the open state. After that, voltage supply is stopped to close the valve.

The invention discloses a deep sludge dehydration treatment device and a treatment method thereof. The deep sludge dehydration treatment device comprises a screw conveying and extrusion integral machine and an extrusion dehydration chamber, wherein the screw conveying and extrusion integral machine comprises a conveying shell and a screw shaft of a varying pitch; the extrusion dehydration chamber comprises a left filtering plate, a right filtering plate and a middle filtering plate; the left filtering plate and the right filtering plate are opened outwards or closed inwards by taking the middle filtering plate as a shaft. By adopting the deep sludge dehydration treatment device, the problems that in the prior art sludge is high in water content after being treated and the operation cost is high can be solved.

The invention discloses a control method of a heat pump air conditioning system for an automobile. According to the control method, action time of all electromagnetic valves is alternated, the risk of noise superposition caused by simultaneous action of the plurality of electromagnetic valves is avoided; the front-back pressure difference of the electromagnetic valves is enabled to be smaller than valve opening pressure value when the electromagnetic valves are opened and actuated, so that the risk that pneumatic noise is generated when the valves are opened in the case of large front-back pressure difference is avoided, and valve opening noise of the electromagnetic valves is reduced; action time of starting, rotating speed reduction, stopping and rotating speed recovery of a compressor is alternated with the action time of the electromagnetic valves, and operation noise of the compressor is reduced; the action frequency of each electromagnetic valve and the action frequency of an electronic expansion valve are reduced, and action noise of the electromagnetic valves and action noise of the electronic expansion valve are reduced; and under the working condition where noise of the compressor is easily identified, the rotating speed is reduced to low speed or medium speed, and the operation noise of the compressor is reduced. According to the control method, NVH performance of the heat pump air conditioning system for the automobile is effectively improved, so that the NVH performance of the whole automobile is further improved.

The invention relates to the field of home appliances, and discloses a fan assembly and an exhaust hood. The fan assembly comprises a volute (1), an impeller (2) and a cleaning device (3), wherein theimpeller is mounted in the volute; the cleaning device comprises a jet mechanism capable of performing reciprocating motion; and a nozzle (31) of the jet mechanism is positioned between the outer circumferential wall of the impeller and the inner circumferential wall of the volute, and used for jetting a cleaning medium towards the outer circumferential wall of the impeller in a reciprocating moving manner; Through the above arrangement, the area of the cleaning effect of the nozzle on the inner circumferential wall of the volute can be greatly increased, the dead corner of cleaning can be reduced, and then oil dirt gathering on the impeller and the volute can be more effectively removed; and consequently, not only can the exhaust effect of the fan assembly and the exhaust hood be improved, but also the operation noise of the complete exhaust hood can be effectively reduced and the user experience can be improved.

An idling-time target phase setting unit (130) variably sets a target phase based on a target idle speed that is set by a target idle speed setting unit. (110) Especially, when the target idle speed is lower than a predetermined rotational speed and operating noise of a variable valve timing mechanism (2000) is easily heard by, for example, a driver, the.idling-time′ target phase setting unit (130) sets the target phase so that a range, in which the valve phase is allowed to change, is restricted within a phase region where a speed reduction ratio is high and the operating noise is relatively low.

A linear oscillating pressurizing includes a main body having an air outlet end and an air outlet valve, two electromagnetic elements disposed in the main body, a piston element disposed between the two electromagnetic elements, which has an air inlet valve disposed thereon, and a control circuit to generate oscillating current pulses. By using a series of current pulses generated from the control circuit, one can magnetize the two electromagnetic elements to the same polarity. By changing the polarity of the electromagnetic element, the attractive force and the repulsive force exerted on the piston element doubles the magnetic force used for reciprocating the piston element. By further incorporating the reciprocating movement of the piston element with the air flow, a pressurizing device having a doubled pressurizing output is obtained.

A heat-dissipating fan of the invention has an axle, a bearing, a rotor and a stator. The axle and the bearing are made of a ceramic material, and are located at a central location of the rotor and the stator. The bearing is a hollow cylinder integrally formed into a single body, and has a central hole and a recess at its bottom. The axle penetrates through the central hole of the bearing to contact the recess. A magnetic force center of the silicon steel sheet is at a level lower than that of the magnetic bar to generate radial and axial force components, allowing stable rotation of the rotor. The heat-dissipating fan of the invention provides advantages such as low friction, lower noise, low energy consumption, high performance and high stability.

An illumination system disposed in a projection apparatus includes a solid-state light source group, a cooling module, and an ion fan. The cooling module is thermally coupled to the solid-state light source group. The cooling module is located on a path of a forced convection air generated by the ion fan. The projection apparatus avails prolonging a life time of the illumination system, and the ion fan does not have a magnetic shearing sound of a motor and a wind shearing sound of fan blades to avail reducing an operation noise of the illumination system.

The invention discloses a multi-grade screening machine capable of automatically feeding. The multi-grade screening machine comprises a feeding cylinder, a multi-grade screening box and a vibration exciter. A feeding screw conveyer is arranged in the feeding cylinder, a casting hopper is arranged on the lower side of the feeding cylinder, a bearing seat is arranged on the lower side of the castinghopper, and a feeding cylinder base is arranged on the lower side of the bearing seat. A feeding screw conveyer driving shaft is arranged in the middle of the upper side of the feeding cylinder, anda feeding screw conveyer driving wheel is arranged at the upper end of the feeding screw conveyer driving shaft. The feeding cylinder is arranged at a feeding port, raw materials are conveyed evenly from the lower end of the feeding cylinder to the upper end through the feeding screw conveyer in the interior, thus the conveying efficiency of the materials is improved. A screening box cover plate is arranged so that smoke and dust in a box body can be prevented from drifting in the vibration process of a screening plate in the multi-grade screening box, thus the mechanical accuracy of the equipment cannot be influenced. Supporting columns sleeved with springs are arranged on the lower side of the multi-grade screening box, operation noises generated by vibration can be reduced, and the rotation accuracy of the equipment is ensured.

A cooling fan includes a base, a lid, a fan wheel, and an auxiliary shaft assembly. The lid is arranged above the base. The fan wheel has a shaft rotatably coupling with the base and a highest point spaced from the lid by a first gap. The auxiliary shaft assembly is arranged between a top of a hub of the fan wheel and a bottom face of the lid, with a second gap formed between the auxiliary shaft assembly and the top of the hub or between the auxiliary shaft assembly and the bottom face of the lid. The second gap is smaller than the first gap. Alternatively, the auxiliary shaft assembly has a first auxiliary shaft protruding from the top of the hub and a second auxiliary shaft disposed on the bottom face of the lid, with a second gap formed between the first and second auxiliary shafts smaller than the first gap.

The invention relates to a household garbage smashing, winnowing and compressing transportation car. The household garbage smashing, winnowing and compressing transportation car comprises a car chassis which is provided with a garbage collecting and compressing tank, an automatic charging device, a garbage can and a smashing and winnowing device; the garbage collecting and compressing tank is arranged on the tail portion of the car; the garbage can and the smashing and winnowing device are arranged between the head portion and the tail portion of the car; the automatic charging device used for grabbing a roadside garbage can is connected with the side edge of the car chassis below the garbage can; and the smashing and winnowing device used for smashing and classifying the garbage is connected with the garbage can and the garbage collecting and compressing tank. The household garbage smashing, winnowing and compressing transportation car has the beneficial effects that the garbage pretreatment function of garbage smashing and plastic thin film winnowing is achieved, the garbage is stored in different bins after being classified, the sealing performance is good, secondary pollution cannot be caused, the garbage smashing and compressing loading capacity is high, the automation level is high, loading and unloading are safe and reliable, and the work efficiency is high.

A light-weight pneumatic massage apparatus with low operation noise is provided. This apparatus includes a pneumatic massage device and a pump separated from the massage device. The apparatus further includes electromagnetic valves for controlling supply and discharge of pressurized air to and from air chambers of the pneumatic massage device, respectively. Each of the electromagnetic valves includes a displaceable valve member having an armature, and a solenoid for attracting the armature to move the displaceable valve member when a voltage is applied to the solenoid. The apparatus further includes an electromagnetic valve control unit which controls a voltage supplied to the solenoid to open the electromagnetic valves such that the voltage increases from gradually with the passage of time. The armature is attracted onto the end surface of the solenoid within the time period. Then, in a state in which the voltage is reduced to, the armature is maintained attracted onto the solenoid to keep the open state. After that, voltage supply is stopped to close the valve.

A light device including a housing, a cooling unit and a light emitting unit is disclosed. The housing has an assembly opening and an electrical base. The cooling unit is in the housing and has a heat dissipating seat, a driving member electrically connecting with the electrical base, and a fan wheel rotatably coupled with the driving member. The heat dissipating seat has a lateral wall coupled with the housing, an inner air channel formed in the lateral wall, a base portion arranged in the inner air channel for the driving member to be mounted, and at least one through hole penetrating the base portion and communicating with the inner air channel. The light emitting unit is coupled with the heat dissipating seat and electrically connects with the electrical base. An outer air channel is formed between the lateral wall and the housing.

A master cylinder having a body with a bore therein delimited by a piston into a work chamber and a supply chamber. The work chamber (16) is connected to wheel brakes, while the supply chamber is connected to a fluid supply, through a supply duct. The piston has a shank retained by a guide ring mounted in the bore and a head bears against a thrust ring in a rest position. A first end of the supply duct is connected to the fluid supply, while a end is connected to the supply chamber. A hydraulic damping arrangement that dampens movement of the piston toward the thrust ring and includes structure for shutting off the second end of the supply duct such that brake fluid flows at a reduced flow rate from the supply chamber to the supply duct through at least one exhaust duct.

The invention discloses a rotary excavating drilling bucket pushing type deslagging noise reduction construction method, belongs to the technical field of rotary excavating drilling buckets, and aims to solve the problems that when a rotary excavating drill encounters the condition that deslagging is difficult, a rotary excavating machinist usually operates a drilling bucket to rotate forwards and backwards alternately to impact and throw soil, or drilling slag in the drilling bucket is shaken out through an emergency brake measure in the rotating process, the whole deslagging process generates large noise, and the deslagging effect is poor. The noise of the surrounding environment severely exceeds the standard. The pressure-bearing disc on the upper portion of the drilling bucket is pushed downwards through the drilling machine power head, the pressure-bearing disc pushes the slag discharging plate arranged in the drilling bucket to move downwards through the dowel bar, and therefore slag adhering to the inner wall of the drilling bucket is completely pushed out; the pushing type drilling bucket is adopted for deslagging, deslagging can be completed only by lifting the drilling bucket to make contact with a power pressure plate of the rotary drilling machine to generate continuous pushing force, noise pollution in the deslagging process is greatly reduced, and the noise pollution is greatly reduced especially in a site with strict noise control. And the construction period delay loss caused by shutdown due to complaint caused by overlarge noise is effectively avoided.

The invention provides an automatic water taking device for a water quality monitoring unmanned aerial vehicle. The device comprises a main control box (1), a rollback controller (2), a water collection hose sag limiting block (3), a water collection hose mechanical arm (4) and a collection sample bottle (5), wherein the main control box (1) comprises two sets of steering engines and guide wheels;the main control box (1) is connected to the rollback controller (2); the water collection hose sag limiting block (3) is connected to the water collection hose mechanical arm (4); the main control box (1) adopts two sets of steering engine parallel structures used for respectively controlling forward and reverse rotations of the rollback controller (2); a sectional type mechanical arm capable ofcarrying out rollback action is designed in the rollback controller (2); a groove is reserved in the inner side of each section of the mechanical arm; a water collection hose can be placed in the groove and is arranged in a circular mode, and the length of each circle of the water collection hose is the same; through the rotation of an angle wheel in the controller, the lowering length and the retraction length of the water collection hose can be controlled; through the angle adjustment of the limiting block, an extension angle of the water collection hose can be limited, and an included angle between the water collection hose and a working plane is controlled within an angle range capable of smoothly collecting water in a water collection process of the water collection hose.