Abstract: A passage structure for an air compressor mainly has a trough extended from inside of a casing that communicates with a second space to increase the contact area of air and the casing. The trough has an outer surface with a plurality of cooling fins located thereon to enhance total heat dissipation effect. The trough forms an additional space to increase air capacity and can reduce noise during compression operation.

Abstract: The present invention relates to an airbag structure comprising an airbag with multiple straight walls defining a hermetic interior; a plurality of baffles received in the interior of the airbag and a plurality of valves for communicating the interior with an air supply. Thus, contact area between the airbags and the human body is widely good,and the shape of the airbag structure of the mattress results in good comfort for a bed patient.

Abstract: A heat sink structure for air mattress mainly has a control unit having an air pump which is a powered device for supply of compressed air, and a controlling valve which is a fluid connector for selecting some of components to connect; and an air mattress having many groups of airbags arranged designedly while each airbag is a cannular structure which is expanded with pumping up and shrunken with draining off, and a heat sink layer which is a hollow structure; wherein the heat sink layer which is breathed and is connected to the controlling valve through an exhaust conduit; and each of the airbag groups is connected to the controlling valve through one conduit respectively and the controlling valve operated by the control unit selects any one group of the airbags to be connected for fluid flow and alternates the first conduit and the second conduit to connect with the air pump.