Power device capable of generating greater propelling force

A power device comprising an impeller driven by a rotary shaft, wherein inner channels and outer channels which communicate with outside are sequentially formed in the shell body of the impeller in a direction from inside to outside, and fluid layers which have different flow speeds are respectively formed in the inner channels and the outer channels;

• wherein flow speeds of the fluid layers in the inner channels is slower than flow speeds of the fluid layers in the outer channels, resulting in outward pressure differences, so that a pressure the impeller bears is guided to the outside to reduce energy consumption;
• the outer channels communicate with the outside through a plurality of first air ports, the first air ports arranged along the length direction of the shell body of the impeller communicate with exhaust ports arranged on the farthest end face of the shell body of the impeller through the outer channels, and flow disturbing devices are arranged in the outer channels, so that an outer surface of the shell body of the impeller and the outer channels in the shell body jointly form high-speed fluid layers;
• and
• the inner channels communicate with the outside through a plurality of second air ports and/or communicating pipes, and opening areas of the first air ports are larger than opening areas of the second air ports;
• different flow speeds between the fluid layers in the inner channels and the high-speed fluid layers generate pressure differences in a direction from inside to outside, whose pressure direction is opposite to a direction of the outside fluid pressure of the shell body of the impeller for them to be mutually counteracted, and their mutually counteracted portion is the impeller's increased propelling force sources.