Adapter pipe penetrating through casing

The invention belongs to the field of adapter pipe design, and relates to an adapter pipe penetrating through a casing, which comprises an adapter pipe, a floating ring, a pipeline and the casing. The adapter pipe is vertically and coaxially connected with the pipeline and comprises a guide pipe, an outer cone connector and an outer sleeve nut. The guide pipe and the outer cone connector are coaxially arranged, a profiled groove matched with the floating ring is formed in the outer wall of the guide pipe, and the guide pipe is matched with the floating ring and an inner hole of the cartridge receiver installation base through the profiled groove, so that sealing and reliable connection are achieved. Due to the fact that the number of related scattered parts is small, the pipeline connecting and assembling process of the inner casing and the outer casing is very simple, and the requirements for the assembling process and sequence are greatly lowered. After the adapter tube is simplified, under the condition th