Heat transfer device

The heat transfer device has an outer casing which has a floor extending from the side walls and an open surface. The inner housing (2) has a port (22) with an opening (20) in a side wall (14) of the outer housing (4). An outer wall (54) is formed at a section of a spherical zone, which is arranged in the corresponding spherical zone at the opening which delimits inner wall (56) of the outer housing.