Two-way air inlet cap

The utility model discloses a two-way air inlet cap, which belongs to the technical field of air inlet systems of engines and comprises an air inlet cap shell, a central air pipe and a straight-through rotational flow pipe, one end of the air inlet cap shell is an air inlet end, the other end of the air inlet cap shell is an air outlet end, and the air inlet end is provided with an air inlet hole used for enabling air to enter an inner cavity of the air inlet cap shell; the central air pipe is arranged in the air inlet cap shell in a sleeved mode, and an air channel of the central air pipe has the two states of communicating with the air inlet end of the air inlet cap shell and closing the air inlet end of the air inlet cap shell. The more than one straight-through rotational flow pipe is fixedly mounted on the peripheral side of the central gas pipe, a gas inlet of each straight-through rotational flow pipe is communicated with the gas inlet end of the gas inlet cap shell, and a dust discharge channel of eac