Manufacturing method of automobile air filter structure DocumentNo.: 1 1430008 Reading: 909 Source: National Maritime Bureau: X Technology >; The invention relates to the technical field of automobile power devices, in particular to an automobile air filter.
Background: Undoubtedly, noise has become a public hazard that affects people's comfortable life, and the automobile industry is no exception. Major automobile manufacturers attach great importance to the improvement of nvh performance while ensuring other performance of automobiles. The noise of air intake system is one of the sources that affect automobile noise, and air filter, as the gateway of air entering the engine, can filter out the dust in the air on the one hand and avoid the wear and damage of the engine; On the other hand, the air filter, as an expansion muffler, can reduce the intake noise. Therefore, the noise reduction design of air filter is very important.
The air filtration design is mostly simple cavity structure, and generally adopts single circular tube for air intake and exhaust, and the cross section has no obvious change, which can not effectively increase the acoustic impedance, thus improving the noise reduction effect; In addition, the general air filters are installed on the battery and the front baffle by bolts, and the rigidity of the installation points is generally weak, and most of them fail to effectively reduce the intake noise. Even considering the noise, the resonant cavity is connected with the intake pipe, but it takes up the cabin space with narrow layout space and brings inconvenience to the layout.
In the patent "An air cleaner with integrated resonant cavity" (patent publication number: cn 103629024a), although the resonant cavity is set inside the air cleaner, which can reduce the noise to a certain extent, the cross section of the intake pipe has not changed, which is not conducive to further increasing the acoustic impedance to reduce the noise, and the factor that the body is highly vulnerable to vibration is not considered. In addition, the air filter designed in this way has a large volume, which is not conducive to the engine compartment.
Technical realization factors: The technical problem to be solved by the invention is to realize an automobile air filter structure capable of improving intake noise.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: an automobile air filter structure comprises an air filter upper shell and an air filter lower shell, wherein an air inlet chamber, a resonant cavity, a filter chamber and an air outlet chamber are arranged in the air filter lower shell, the air inlet chamber is provided with an air filter inlet, the air outlet chamber is provided with an air filter outlet, and a filter element is arranged in the filter chamber. Air enters from the air inlet of the air cleaner, passes through the air inlet chamber, the resonant cavity, the filter chamber and the air outlet chamber in turn, and is discharged from the air outlet of the air cleaner. The air inlet chamber is a pipe arranged in the resonant cavity, one end of the air inlet chamber is the air inlet of the air cleaner, and the other end of the air inlet chamber is provided with a connecting hole communicated with the resonant cavity.
The cross-sectional area of the air inlet chamber decreases from outside to inside.
The connecting hole is a circular hole with a diameter of10 mm.
The upper air cleaner housing and the lower air cleaner housing are made of pp-gf30, and the material thickness is set to 2.5 mm ..
The air inlet chamber is a straight tube with a square cross section, the air inlet end of the air inlet chamber extends out of the resonant cavity, and the cross section of the air inlet chamber has a decreasing gradient from outside to inside.
The air filter upper shell and the air filter lower shell form a flat square box, and the vertical height of the square box is 130mm- 160mm, and cross-shaped reinforcing rib structures are distributed on the air filter upper shell and the air filter lower shell.
(Photo/Text/Photo: Pacific Auto Network Q&A called Beast)