39results about How to "Reduce suction noise" patented technology

The present invention relates to a blower for vehicles, which includes guide walls formed on a bypass passageway formed between a scroll case and an outer case to send the indoor air and the outdoor air to a lower suction opening of the scroll case, thereby reducing suction noise by guiding a uniform flow of air introduced into the lower suction opening, preventing deformation of the outer case, and preventing a droop of the air filter by supporting a lower portion of an air filter when an intake duct injection-molded in a vertically parted mold is applied thereto.

The invention relates to a drive assembly of a pulsator washing machine. The drive assembly comprises a mounting tray. A spindle and a shaft sleeve sleeved on the spindle are rotatably disposed on the mounting tray. A reduction electromagnetic clutch mechanism is disposed between the spindle and the shaft sleeve. A drive mechanism is disposed on the lower portion of the spindle. The reduction electromagnetic clutch mechanism is an electromagnetic clutch mechanism having a function of electromagnetic clutch planetary gear reduction. The reduction electromagnetic clutch mechanism is provided with a planetary gear component and an electromagnetic clutch component. The drive mechanism is an external rotor direct-drive motor comprising a rotor and a stator. The stator is fixedly connected to the mounting tray. The rotor is fixedly connected with the spindle. The spindle and the electromagnetic clutch and planetary gear reduction mechanism are directly driven by an external rotor motor, and accordingly defects such as complex ratchet and pawl structure, large size and low control accuracy in the prior art are broken through. Electromagnetic clutching is high in transmission efficiency, accurate in transmission and clutching control and low in noise; the whole drive assembly is light in weight, pull-in voltage and holding voltage are less demanded in electromagnetic clutching, and energy consumption is reduced effectively.

The invention relates to an intake apparatus for internal combustion engine. The intake apparatus including two intake ducts and a flap mechanism disposed in one of the two intake ducts, the flap mechanism including a main flap, a damper flap, a damper chamber cooperating with the damper flap to form a damper space, and a biasing member biasing the main flap in a closing direction. When the main flap is located in an angular range between the fully closing position and a predetermined opening angle, a peripheral edge of the damper flap is opposed to an inner wall surface of the damper chamber with a fine clearance to thereby render the damper space substantially closed. When the main flap is located with an opening angle larger than the predetermined opening angle, a communication passage to open the damper space is formed between the inner wall surface of the damper chamber and the peripheral edge of the damper flap.

The invention provides an air valve noise suppression system and method for a rail transit oilless air compressor. The air valve noise suppression system comprises an air filter, a cylinder cover, a crankcase and an air inlet pipeline. An air inlet of the crankcase communicates with an exhaust port of the air filter, and an air outlet of the crankcase communicates with the cylinder cover through the air inlet pipeline. The cylinder cover comprises a cylinder air inlet, a cylinder air outlet, a suction cavity and an exhaust cavity. The cylinder air inlet communicates with the suction cavity, and the cylinder air outlet communicates with the exhaust cavity. The suction cavity and the exhaust cavity are both annular inner cavities arranged in the cylinder cover. The suction cavity is arranged between the inner ring side face of the exhaust cavity and the central axis of the cylinder cover. The air valve noise suppression system is simple in structure, the crankcase is used as a buffer tank of the air inlet pipeline through the creative design, and suction noise generated before inlet air flow enters a cylinder can be lowered by absorbing noise on the air valve suction side multiple times in a labyrinth mode. In addition, through the unique design of the cylinder cover, suction noise can be prevented from coming out, and the high-frequency spectrum is lowered.

The invention provides a suction muffler, a compressor, and a refrigerator, wherein the suction muffler includes a casing, the casing is configured with an air inlet and an exhaust port, and the inner cavity of the casing is provided with A baffle, the baffle divides the inner cavity into an upper cavity corresponding to the exhaust port and a lower cavity corresponding to the air inlet, and the baffle is configured with a The multiple through holes of the cavity also include multiple oil-gas separation covers, and the multiple oil-gas separation covers are respectively one-to-one covered on the multiple through holes and are located on the side of the partition facing the upper chamber. On the side, the oil-gas separation cover has a flow hole to pass through the upper chamber and the lower chamber. According to the suction muffler, compressor, and refrigerator of the present invention, the amount of oil carried by the suction of the cylinder can be reduced, and at the same time, the resistance of the suction air flow and the noise of suction can be reduced, so that the suction is more uniform and smooth.