The body of the air filter bag is the basic body of the entire filter bag, and it is the primary carrier. It largely determines the appearance and flow characteristics of the air filter. The data of the main body is usually made of die-cast aluminum alloy or zinc alloy, and the plastic material is cheap but has low strength. At the time of depiction, the exterior type of the air filter should be similar to the appearance of the pressure reducing valve and the oil mister, and should be summarized and considered. The appearance design is very important. It relates to whether or not it can excel in the triple products of many manufacturers and turn over the expenses. In the process of depicting the author, the exterior design accounted for about 40% of the workload, which is a difficult point. The general principle of exterior design is: In the premise of ensuring the internal layout, the appearance is characteristic, simple, compact, easy to assemble and modularize, and especially to think about how to connect with other components. Among the current products, there are mainly two types of articulation methods. One is that the main body has an inclined surface and is fixed by a slant on the fixing member; the other is connected by a bolt. The former is easy to dismantle and repair, while the latter is compact. Together, in order to guarantee that the filter will not be reversed, the valve body must have a positive indication of the direction of gas movement.
The depiction of the inside of the air liquid filter bag body is primarily the depiction of the flow channel, since the flow channel is one of the primary factors that affect the flow characteristics.
Flow path design should pay attention to:
(1) It is necessary to expand the inlet area of the inlet flow path as much as possible. The area of the inlet flow path is 1.5 to 2 times of the area of the drawing area. (2) The flow path should be as short as possible. Under the premise of satisfactory strength, the deflector should be as far as possible. Move up close to the air intake. The short flow path also shortens the layout.
When designing a die-casting part, the air filter body should try its best to reduce the machining allowance, usually 0.5 to 1.5 mm. Too much cutting allowance will add data cost and processing cost, and also add the defective rate. This is due to the fact that the inside of the die-casting process will inevitably show shrinkage and other undesirable phenomena. The thickness of the relatively fine metal layer is relatively thin, and excessive cutting amounts will damage the fine layer. When designing, it is necessary to make the wall thickness uniform and not to have arc transition at the wall thickness to reduce the occurrence of concentrated stress.
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