11results about How to "Reduce impact noise" patented technology

The utility model relates to the technical field of swimming pool water outlet, disclose a straight -in type water mouth with side water outlet. It aims at solving the technical problem of low work efficiency of big workload that the water outlet direction setting is on the top cover in the prior art, and the design of vertical direction leads to the dust and sundries of pool bottom gathering at the water outlet position, and only can use the dirt -suction machine to clean, the workload is big, and the work efficiency is low. The utility model includes base, detachable installation top cover above base, set up a plurality of side water outlets on the side of base, base is connected with backwater pipe through side water outlet to form water flow channel, annular supporting block is set up in the inner wall of backwater pipe to support adjustable pressing plate, adjustable pressing plate is installed in the middle of adjustable screw rod, adjustable screw rod is installed in hollow cylindrical structure, hollow cylindrical structure is fixed in annular supporting block through connecting rod, the thread of adjustable screw rod is set up in the inner wall of hollow cylindrical structure. The utility model has the advantages of saving construction time, high work efficiency, low construction difficulty and the like.

This utility model belongs to the field of fan blade technology and discloses a multi-blade noise-reducing blower fan blade, including: a fan blade assembly comprising 53 forward-curved fan blades evenly distributed along the circumference of a hub, with a motor mounting cavity at the center of the hub; the axial end face of the hub has several heat dissipation holes, arranged equidistantly along the circumference to form an annular heat dissipation channel; a motor assembly comprising a thickened silicon steel sheet frame, the silicon steel sheet thickness being 0.5-0.8mm; the ratio of the fan blade diameter D to the fan outer diameter D0 is 75%-78%; this utility model, by using 53 forward-curved fan blades with an optimized bending angle of 15°-25°, and a chord length ratio of the leading edge to the trailing edge of the blades of 1:0.8-1:0.9, effectively suppresses turbulence and eddy noise. An arc-shaped transition section with a transition radius R = 3-5mm is provided at the connection between the hub and the fan blades to reduce airflow separation noise.

This invention discloses a low-noise hydraulic cylinder with adjustable end stroke and its assembly method, belonging to the field of ship vibration reduction and noise reduction technology. The cylinder includes a bow end cap, cylinder barrel, piston, connecting rod, buffer sleeve, stern end cap, and structures such as a reversing oil passage, a buffer oil passage, a reversing oil chamber, and a buffer oil chamber. The buffer sleeve is fitted onto both sides of the connecting rod, forming a closed buffer oil chamber in cooperation with the end cap, cylinder barrel, and piston. During operation, the oil flow rate and pressure of the buffer oil chamber are controlled by adjusting the oil pressure at the buffer port, achieving precise adjustment of the piston and connecting rod end stroke, avoiding rigid collision between the piston and the end cap, and suppressing impact noise at the source. This invention has a compact structure, reliable sealing, and convenient assembly, significantly reducing vibration impact and operating noise, improving the stealth of ships, and is suitable for scenarios with high vibration reduction and noise reduction requirements, such as the opening and closing of ship hull covers.

This application discloses an architectural planning and design model sand table, belonging to the field of sand table technology. The model sand table includes a base, a box mounted on the base, and a main body of the model sand table located at the end of the box away from the base. The box is equipped with a storage mechanism for storing the main body of the model sand table. The storage mechanism includes a frame that moves axially on the box, a drive component mounted on the box for moving the frame closer to or away from the base, and a dustproof cover at the end of the frame away from the base. Through the cooperation of the height-adjustable frame and the dustproof cover, the model sand table achieves the dual functions of dustproof storage and enclosure protection. During storage, the frame can be raised above the model's height using the drive component, and then the dustproof cover can be closed to effectively isolate dust. During display, the frame can be adjusted to a suitable height to form a fence surrounding the model, reducing damage from external collisions and improving the practicality and protection of the sand table.

The utility model provides a kind of engine cooling system, including engine, air inlet cover, air duct and heat exchanger, air duct is arranged between air inlet cover and heat exchanger, air duct is respectively communicated with the cold air inlet end of air inlet cover and heat exchanger, one end of engine is provided with fan, fan is set in air duct, the heat dissipation port of engine is communicated with the heat exchange air inlet of heat exchanger, at least one air guide channel and at least two first sound attenuation components are provided in air duct, first sound attenuation component is provided on the both sides of air guide channel, first sound attenuation component includes first air deflector and first sound attenuation cotton, first cavity is provided in first air deflector, a plurality of first perforations are set on the surface of first air deflector, first perforation is communicated with first cavity, and first sound attenuation cotton is set in first cavity;The utility model has the advantages of simple structure, high cooling efficiency and low noise.

This invention discloses a volute, a fan, a smart appliance, and a method for generating the volute profile. The volute's annular wall includes a volute tongue segment, a first helical segment, a second helical segment, a third helical segment, and a fourth helical segment connected sequentially. The first height boundary point of the volute is located between a first feature point and a first width boundary point. The second feature point is the first width boundary point. The third feature point is located between the second width boundary point and the second height boundary point of the volute. The fourth feature point is the second width boundary point. The first helical segment includes a first helical sub-segment and a second helical sub-segment. The profiles of the first helical sub-segment and the second helical segment have opposite helical directions. Using the embodiments disclosed in this invention, even in limited space, uniform airflow within the volute can be ensured, thereby improving the aerodynamic performance of the fan.

The utility model discloses electric steamer, including the base of being equipped with water tank and the juice receiving disc of being placed on the base, be equipped with the water storage cavity and steam generation cavity of independent setting in the water tank, be equipped with the water replenishment channel of limiting water by the water storage cavity flow to steam generation cavity between the water storage cavity and steam generation cavity, and the water storage cavity top is open and forms the water inlet, and the water replenishment channel has the water outlet with steam generation cavity intercommunication and higher than steam generation cavity bottom surface, and the base still includes the water control switch for controlling the opening and closing of water replenishment channel, and the water control switch is used for closing water replenishment channel when the juice receiving disc is separated from the base, and the juice receiving disc is sealed with the base cooperation to water inlet, and the water control switch is used for opening water replenishment channel when water inlet is sealed. The utility model discloses electric steamer, and the user is convenient to the water storage cavity and adds water, and the water is simple and convenient to add, in addition, can also realize the automatic replenishment of a certain water amount to steam generation cavity, to realize the effect of fast steam, prevent dry burning.

This invention discloses a geared motor and a refrigeration appliance. The geared motor includes a motor body, a gearbox assembly, and a drive plate. The drive plate is electrically connected to the motor body. The gearbox assembly includes a gearbox body and a gear set, where at least some gears have helical teeth. The motor body includes a motor bracket located outside the gearbox body. The output shaft of the motor body passes through the motor bracket and connects to the gear set inside the gearbox assembly. This invention fundamentally solves the problem of motor installation concentricity deviation, eliminates abnormal vibration and noise caused by eccentricity, and thus significantly reduces operating noise while maintaining good concentricity.

This application relates to the field of noise reduction equipment technology, and provides a noise reduction device, including: a plurality of noise reduction pipes, each having a noise reduction chamber for eliminating the impact noise of exhaust from the pneumatic device's exhaust valve; the plurality of noise reduction pipes being interconnected; at least one air inlet port located on the outer surface of the noise reduction pipes, connected to the noise reduction chamber, and used to connect to the exhaust valve port of the pneumatic device; and a negative pressure generating device located on the noise reduction pipes, used to draw air from the noise reduction chambers. This invention isolates the impact noise of high-frequency airflow from the pneumatic device through the noise reduction chambers of the noise reduction pipes and discharges the high-pressure airflow outdoors, preventing the exhaust airflow from disturbing the working environment, thereby effectively reducing the noise generated by the pneumatic device's exhaust valve. Furthermore, the negative pressure environment within the noise reduction chambers buffers the impact of the airflow, further reducing noise.

This invention discloses a self-generating ground spring lock for use in glass doors. The glass door has a pivot, and a pin seat is located at the bottom of the glass door near the pivot. The self-generating ground spring lock includes a housing, within which a power generation component and a control motor are housed. The rotating end of the power generation component is fixedly connected to the pivot of the glass door. The output end of the control motor is connected to a pin assembly, which corresponds to the pin seat. A cam is provided within the housing, fixedly engaged with the pivot. One end of the cam has a return spring plate that rolls with the cam, and both ends of the return spring plate are connected to damping components. This invention enables self-generation and provides damping buffering, effectively reducing damage to the door from impacts.