In-vehicle air pressure balance device with noise reduction function

Abstract

The invention relates to an in-vehicle air pressure balance device with a noise reduction function. The device comprises a shell, two partition plates, an air inlet pipe, a transition pipe and a pressure reduction valve. An inlet and an outlet are formed in the shell, and an inner cavity of the shell is divided into a resonant cavity, an expansion cavity and an output cavity through the two partition plates; one end of the air inlet pipe is matched with the inlet and is communicated with the interior of a vehicle, and the other end of the air inlet pipe penetrates the two partition plates to be communicated with the output cavity; noise reduction holes are evenly distributed in the portion, located in the expansion cavity, of the air inlet pipe, and two ends of the transition pipe stretch into the resonant cavity and the expansion cavity respectively; the pressure reduction valve comprises blades and gratings, wherein the blades cover the outlet, and the gratings are used for supporting the blades; the pressure reduction valve is arranged at the position of the outlet, and is used for preventing air from flowing into the output cavity from the outer portion of the vehicle; and when the air pressure in the output cavity exceeds the large air pressure, the pressure reduction valve is opened, and therefore the air is allowed to flow to the outer portion of the vehicle from the output cavity. The air pressure inside the vehicle can be balanced, and meanwhile the noise transmitted to the interior of the vehicle from the outlet can be removed.

Description

technical field [0001] The invention relates to a structure for releasing pressure from the interior of the automobile to the exterior of the automobile, in particular to an air pressure balance device in the automobile with the function of noise reduction. Background technique [0002] With the improvement of people's requirements for car ride comfort, in order to improve the sound insulation performance of the whole car, the sealing performance of cars has been greatly improved at present. As a result, once the air pressure inside the car changes, it is difficult to return to the normal air pressure range that the human ear feels comfortable. When the car is closing the door, opening the external circulation, and turning on the air conditioner, the air pressure inside the car will rise. In order to reduce the air pressure inside the car, a balance port is usually set on the body sheet metal to release the pressure. To achieve the purpose of balancing the air pressure insi...

AI Technical Summary

Problems solved by technology

In the prior art, when designing the air pressure balance device in the car at the balance port, only the ventilation problem inside the car is considered, and no noise reduction treatment is performed. The noise transmitted from the air pressure balance device in the car to the inside of the car is difficult to meet the requirements

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