8results about How to "Effective noise reduction" patented technology

The invention discloses an airborne equipment acceleration monitoring and outrange control method and system, which cover acceleration monitoring of the whole flight process, combine dynamic scene modeling and a hierarchical response mechanism, and can timely identify an abnormal state and start corresponding measures. Through system calibration, noise identification, dynamic filtering, mistaken touch prevention parameter setting and a collision algorithm, false alarm and missing alarm caused by vibration, impact or sensor faults are effectively avoided, double modes of automatic collision detection alarm and manual triggering alarm are supported, the flexibility and safety of the system are improved, and once it is confirmed that the system is in distress, the system is safe and reliable. Rescue signals including position, time, height and other key information can be automatically sent, and the emergency response time is remarkably shortened.

The utility model discloses a low -noisy rear wheel cover assembly, including wheel cover main part, flexible connecting piece and shock attenuation subassembly. The wheel cover main part surface is equipped with a plurality of locating block for installing flexible connecting piece, and flexible connecting piece includes the screw bushing pipe and the ring seat fixed in the inboard of locating block, and the inboard of ring seat is equipped with a plurality of lug and screw bushing pipe fixed connection, realizes flexible support and radial limit. Shock attenuation subassembly includes the pasting box, props foot and the vibration piece fixed in the end of props foot, and the vibration piece is fixed in the inboard of pasting box through props foot, and can set up different size and slot structure to realize the multi -frequency vibration stop. This structure can effectively absorb the multi -frequency vibration in the vehicle driving process, reduces the wheel cover resonance noise, and promotes the stability and the comfort of whole car driving.

The utility model provides a medical oxygen generator's noise reduction device, the medical oxygen generator's noise reduction device includes Y-type air inlet pipe, Y-type air inlet pipe includes straight pipe portion and Y-type pipe portion, straight pipe portion one end is connected with the second slip pipe of Y-type pipe portion, straight pipe portion one end is equipped with the first slip pipe that connects with the Y-type pipe portion, the first slip pipe is equipped with the second slip pipe, the second slip pipe is equipped with the second slip pipe, and the second slip pipe is equipped with the second slip pipe. The second sliding pipe is sleeved with the first sliding pipe in a sliding mode, a buffering corrugated pipe part is integrally formed on the first clamping ring, and the other end of the buffering corrugated pipe part is connected with the second clamping ring on the straight pipe part. When airflow enters and gathers along the two pipe ends of the Y-shaped pipe part, the second sliding pipe and the first sliding pipe can slide when the airflow gathers and impacts, and the buffering corrugated pipe part can play a role in damping and buffering, so that vibration noise generated by airflow gathering is reduced, and the service life of the air conditioner is prolonged. A plurality of lubricating oil storage annular grooves used for being filled with solid lubricating oil are formed in the inner wall of the first sliding pipe, so that sliding between the first sliding pipe and the second sliding pipe is smoother, and noise generated by sliding is avoided.

The application relates to the technical field of toothbrush control, and discloses an electric toothbrush, which comprises a handle cylinder, a first machine core frame and a second machine core frame which are detachably connected and are installed in the handle cylinder, a sound wave motor is arranged between the first machine core frame and the second machine core frame, a brush head assembly is clamped on a driving shaft of the sound wave motor, and a control board is arranged on one side of the first machine core frame; a switch board is arranged on one side of the second machine core frame, a micro switch for sensing the pressure of the brush head assembly is arranged on the switch board, a guide rail is arranged on the side wall of the first machine core frame, a sliding groove which is in sliding cooperation with the guide rail is arranged in the handle cylinder, a convex point is arranged on the guide rail, the first machine core frame is in interference cooperation with the handle cylinder through the convex point, a shock-absorbing ring is sleeved with one end of the first machine core frame and the second machine core frame, and the shock-absorbing ring is in abutment with the inner wall of the handle cylinder. The application simplifies the pressure sensing structure, can reduce the manufacturing cost of the electric toothbrush, can effectively reduce the noise of the electric toothbrush due to the shock-absorbing and positioning effects of the shock-absorbing ring, and enhances the use experience of users.

The present application relates to air conditioning technical field, specifically disclose a kind of vehicle vibration control method and air conditioner based on parking air conditioner, to solve the problem of large noise of existing top parking air conditioner.To this end, the parking air conditioner of the present application is arranged on the top of the vehicle, and the air outlet of the parking air conditioner is communicated with the interior of the vehicle, and the control method comprises the following steps: obtaining the vibration data of the top of the vehicle;Obtain the operating parameters of the parking air conditioner;According to the vibration data and operating parameters, it is judged whether the condition of needing to suppress vibration is met;When the condition of needing to suppress vibration is met, adjust the operating parameters of the parking air conditioner.In the present application, according to the vibration data of the top of the vehicle and the operating parameters of the parking air conditioner, the adjustment of the operating parameters of the parking air conditioner is completed, so as to reduce the vibration amplitude of the top of the vehicle or avoid the resonance frequency between the top of the vehicle and the parking air conditioner, realize the effective noise reduction of the vehicle, and improve the user experience.

The utility model provides an air inlet panel and an exhaust fume collecting hood and a range hood comprising the air inlet panel, the air inlet panel comprises a noise reduction part, the noise reduction part is arranged in the middle area of the air inlet panel, and the noise reduction part is flat and is arranged perpendicular to the air inlet direction of the air inlet panel; the air inlet is annularly formed in the peripheral side of the noise reduction part, and the air inlet is formed close to the edge of the air inlet panel; and the connecting piece is arranged in the air inlet, one end of the connecting piece is connected with the side part of the noise reduction part, and the other end of the connecting piece is connected with the inner wall of the air inlet. By arranging the noise reduction part and annularly forming the air inlet in the peripheral side of the noise reduction part, the arrangement position of a traditional air inlet is changed, and the suction force distribution range is expanded, so that the oil fume absorption effect of the air inlet on the edge of the air inlet panel can be correspondingly improved, and the noise reduction part can absorb noise; and the noise is prevented from radiating outwards from the air inlet panel to influence the use experience of a user.

The invention relates to the technical field of axial flow pumps, and discloses a multi-working-condition adaptive fluorine material axial flow pump which comprises a guide vane body and a horn tube which are fixed to each other, an upper fluorine material sleeve body is arranged on the inner wall of the guide vane body, a lower fluorine material sleeve body is arranged on the inner wall of the horn tube, and a fluorine material clamping sleeve is arranged at the butt joint position of the guide vane body and the horn tube in a clamped mode. The upper fluorine material sleeve body and the lower fluorine material sleeve body are in sealed butt joint with the fluorine material jacket; a movable sealing kit is arranged on the portion, located between the shaft sleeve and the impeller, of the main shaft and used for limiting the impeller and sealing the gap between the main shaft and the shaft sleeve and the impeller. By adopting the split fluorine material shell structure of the upper fluorine material sleeve body, the lower fluorine material sleeve body and the fluorine material jacket, the split fluorine material shell structure can adapt to various corrosive media such as strong acid, strong alkali and organic solvents, and the multi-working-condition requirements of industries such as chemical engineering, metallurgy and environmental protection are met; the movable sealing sleeve forms mechanical locking and fixing, the connecting strength is high, and gaps caused by high-speed medium scouring are effectively prevented.

The invention relates to the technical field of civil engineering, in particular to an efficient high-frequency induction welding process and tool for a wiring board and a connecting board of a current transformer. The process is based on a double-station welding tool, welding operation is completed through tool pre-debugging, wiring board positioning, brazing filler metal presetting, supporting assembly adjusting, connecting plate clamping, double-station synchronous heating and finished product taking in sequence, and synchronous welding of two sets of wiring boards and connecting plates is achieved through the design that double-station synchronous high-frequency induction heating is combined with preset bent soldering lugs. The tool comprises a high-frequency welding induction heating ring, a high-temperature-resistant mounting base, a double-station gear meshing lifting assembly, a bending welding piece and a double-station adjustable connecting plate supporting assembly. Welding of two sets of products can be completed within 120 s, the average consumed time of a single set is 60 s, and the welding efficiency is improved by about 60% compared with a traditional mode; the tool is matched with the wiring board and the connecting board with the length smaller than or equal to 90 mm, frequent replacement is not needed, the problem of false welding in the welding process is solved, welding meat is full, and consistency is good.