111results about How to "Reduce resonance noise" patented technology

The invention discloses an ultrasonic self-cleaned extractor hood and a method thereof. The ultrasonic self-cleaned extractor hood comprises a controller, a machine shell and a centrifugal fan arranged in the machine shell. A cleaning liquid sucking and discharging pump and a cleaning liquid sucking and discharging port are formed in the machine shell. One connector of the cleaning liquid sucking and discharging pump communicates with the cleaning liquid sucking and discharging port through a pipeline. The other connector of the cleaning liquid sucking and discharging pump directly communicates with the bottom of a volute through a pipeline. At least two through holes are formed in the bottom of the volute. Ultrasonic transducers are fixed to the lower sides of the through holes. The fan, the cleaning liquid sucking and discharging pump and the ultrasonic transducers are connected with the controller. The problem that an extractor hood in the prior art is hard to clean or the cleaning effect is not ideal is effectively solved. The ultrasonic self-cleaned extractor hood is high in automation degree, automation cleaning of the extractor hood is truly achieved, and very high practical value is achieved.

The invention provides a double-wind wheel ventilator which comprises a lower body and an upper body. The upper body is provided with an electric motor as well as a rotor shaft, a left spiral case, a right spiral case, a left wind wheel and a right wind wheel arranged on the electric motor. A shockproof fixing ring is arranged between the electric motor and the spiral cases. The shockproof fixing ring consists of an inner ring, an outer ring and a shockproof elastic ring. The shockproof elastic ring is arranged between the inner ring and the outer ring. The electric motor is fixedly arranged on the inner ring end surface of the shockproof elastic ring. The rotor shaft of the electric motor extends out to the two side of the electric motor. The left end and the right end of the rotor shaft are fixedly provided with the left wind wheel and the right wind wheel correspondingly. The joint surface of the left spiral case and the right spiral case and the outer ring in the shockproof fixing ring are movably connected. The left spiral case and the right spiral case are respectively provided with a suction opening corresponding to the left wind wheel and the right wind wheel. After adopting the scheme, the invention can reach the advantages of increasing the air suction and exhaust amount, reducing the noise and being easy to disassemble and wash.

The invention discloses a bathroom anti-skid ceramic tile equally-dividing cutting device, comprising a base, a dual-axle motor, a cutting wheel, a left clamping jaw and a right clamping jaw. Connecting shafts are connected to output shafts on both ends of the dual-axle motor through shaft couplings. A wire winding wheel is fixedly mounted on each connecting shaft. The wire winding wheels are wound with pull wires. A lifting plate is connected with the other ends of the pull wires. A first screw rod is provided with a threaded sliding block in a threaded mode. The threaded sliding block is further arranged on the first screw rod in a sliding mode. A motor frame is fixedly arranged on the lower side of the threaded sliding block through bolts. A cutting motor is fixedly arranged on the rearside of the motor frame. An output shaft of the cutting motor is provided with the cutting wheel in an interference fit mode. Moving up and down of the lifting plate is realized, so that the cuttingwheel on the cutting motor is driven indirectly to go down and anti-skid ceramic tiles are subjected to equally-dividing cutting, and equally-dividing cutting of the anti-skid ceramic tiles with different thicknesses is achieved.

A pneumatic tire comprises grooves 1 to 3 formed in a tread and land portions 4 each having an acute angle portion 5 formed by the grooves 2 and 3. The acute angle portion 5 is chamfered by a plurality of chamfered surfaces 11 and 12 to form into a step shape by the chamfered surfaces 11 and 12 and a connecting surface 21 that connects the adjacent chamfered surfaces 11 and 12. Furthermore, from one sidewall to the other sidewall of the acute angle portion 5 at an end 6 of the acute angle portion 5, a height H1 of the chamfered surface 11 and a height H2 of the chamfered surface 12 are gradually decreased while a length L1 of the chamfered surface 11 and a length L2 of the chamfered surface 12 are gradually increased.

The invention provides a transmission assembly and a lifting vertical column. The transmission assembly comprises a first screw rod, a second screw rod, a third screw rod, a driving device, a first nut which is in transmission fit with the first screw rod, a first sleeve fixedly connected with the first nut, a second nut which is in transmission fit with the second screw rod, a second sleeve fixedly connected with the second nut, a third nut which is in transmission fit with the third screw rod, and a third sleeve fixedly connected with the third nut; the first nut, the second nut and the third nut are fixedly arranged in the circumferential direction, the second screw rod and the third screw rod are hollow, the first screw rod and the second screw rod can rotate synchronously and expand and contract relatively in the axial direction, and the second screw rod and the third screw rod can rotate synchronously and expand and contract relatively in the axial direction; and the four-sectiontransmission assembly achieves driving through rotation of the screw rods, the sleeves are driven by the nuts to achieve expanding and contracting, and thus, transmission of the transmission assemblyis stable and reliable.

The invention provides an air deflector drive structure and air conditioner comprising the same. The air deflector drive structure comprises a driving box (10), a driving box motor (11) and a connecting rod assexcelsior boardembly (20), the driving box motor (11) is arranged on the driving box (10), the first end of the connecting rod assembly (20) is connected with the driving box motor (11) and can be driven by the driving box motor (11), and a vibration-damping block (30) is arranged on the driving box (10). The resonant noise of the air deflector drive structure based on the invention can be effectively reduced in the process of operation.

The invention discloses a low-noise air pump which comprises an upper cover, a cylinder, a piston, a base, a unidirectional inlet and outlet air distributing device, a motor, a linkage mechanism and a partition plate. The upper cover is provided with an exhaust port and an air inlet, and the piston is integrally provided with at least two air bags; the partition plate is provided with a first air outlet hole and first air inlet holes; the partition plate is fixed to a position between the upper cover and the unidirectional inlet and outlet air distributing device, the partition plate and the upper cover are hermetically matched with each other to form a sealed cavity, the air inlet of the upper cover and the first air inlet holes of the partition plate are respectively communicated with the sealed cavity, the first air outlet hole of the partition plate is communicated with the exhaust port of the upper cover, and the first air outlet hole and the first air inlet holes are respectively correspondingly matched with the unidirectional inlet and outlet air distributing device to realize a unidirectional outlet air distributing effect and a unidirectional inlet air distributing effect. The low-noise air pump has the advantages that owing to the partition plate, an airflow passage is prolonged, inlet air can be buffered, impact force is reduced, accordingly, running noise of the air pump is greatly reduced, and tilting deformation of an air inlet check valve of the unidirectional inlet and outlet air distributing device due to long-term direct stress can be prevented.

A permanent magnetic rotor for motor and making method thereof, which contains permanent magnetic ring, rotor core, rotor axle, axle hole for rotor axle penetrating rotor core, high temperature liquid rubber filled between permanent ring and rotor core, the rubber consolidated with permanent magnetic ring and rotor core after cooling. Said invention can effectively eliminate the resonance between motor and fan blade and noise.

Tread having a tread surface intended to come into contact with a road surface and comprising at least one groove of width W and of depth P delimited by two walls facing one another, these walls being joined together by a groove bottom, at least one groove comprising at least one closure device for at least partially closing this groove as it passes through the contact patch, each closure device comprising at least one flexible blade of suitable thickness that allows it to flex under the effect of a circulation of liquid, this at least one flexible blade projecting from the bottom of the groove, each flexible blade being delimited by a contact wall intended to come into contact with the road surface and by end walls each facing a wall delimiting the groove and lateral walls, this tread further comprising at least one passage between the bottom of the groove and each blade of the device, this passage being intended to ensure a minimal flow of water when driving on a water-covered road surface.

A rotor of a BLDC motor includes: a rotor divided into a north pole and a south pole on the basis of a magnetic pole separating line; and a stator at which the rotor is disposed with an air gap, the stator having a first pole shoe, a second pole shoe and a pair of detent grooves at its inner surface, wherein an air gap forming portion for enlarging an air gap between the rotor and the detent grooves is formed at both end portions of the rotor where the magnetic pole separating line passes, so that the rotor can maintain the motor performance and reduce resonance noise by reducing only higher degree of cogging torque from cogging torque generated when the motor is driven.

The invention discloses a laser marking machine with smoke and dust removing functions. The laser marking machine comprises a base, a platform, a double-shaft motor, a laser marking head and smoke anddust removing mechanisms, wherein a marking table is further arranged at the center of the upper surface of the platform, the smoke and dust removing mechanisms are arranged on the two sides of the marking table, a dust removing screen and a smoke removing filter screen are sequentially arranged inside each smoke and dust removing mechanism, a shell is fixedly installed in each smoke and dust removing mechanism, and a dust suction machine is arranged in each shell. Meanwhile, the dust suction machines work in the marking process, and dust and smoke which are generated in the marking process are adsorbed into the dust removal screens and the smoke removing filter screens, so that the functions of removing dust and removing smoke are achieved, and the environment of a processing site is improved. Meanwhile, the dust removing screens and the smoke removing filter screens are all inserted, so that cleaning is convenient to achieve. In the marking process, damping columns and damping spring pieces can play a role in damping, so that resonance noise generated in the marking process is reduced, the operation site environment is improved, and the ear hearing capacity of operators can be protected.