Improved return air filter net structure of bus air conditoner

The utility model discloses an improved return air filter screen structure for autobus air conditioners. The utility model is characterized in that a return air opening of a casing of an evaporator of an autobus air conditioning system is provided with and fixes at least one filter screen frame; the inner side of the filter screen frame is provided with two transverse sliding grooves and two penetrating and extending openings which are communicated with the sliding grooves. A filter screen is formed by that a plastic material frame and filter material are combined together, and the filter screen is inserted, inlaid and led in the sliding grooves of the filter screen frame in a sliding manner through the penetrating and extending openings. Relative inclined planes are arranged between the penetrating and extending openings of the filter screen frame and the withdrawing ends of the filter screen, thereby, the filter screen has the slip resistance. The utility model can prevent the filter screen from generating noise and looseness because of swing, and cause the filter screen to achieve the effects of simple and easy installation, withdrawing and cleaning.