The invention relates to a circulator. The circulator comprises a shell body and a transmission device, wherein the transmission device is mounted on the shell body, a rotary wheel is mounted on the transmission device, a plurality of vanes are arranged on the periphery of the rotary wheel, the rotary wheel is arranged in the shell body, a circulation cavity is formed in the inner wall of the shell body at the periphery of the rotary wheel, a circulation cavity port A is formed in one end of the circulation cavity, a circulation cavity port B is formed in the other end of the circulation cavity, and an isolating body is arranged on the inner wall of the shell body between the circulation cavity port A and the circulation cavity port B. According to the circulator provided by the invention, circular motion and fluid motion are used sufficiently; torsion is better converted into pressure through fluid; pressure is better converted into torsion through the fluid; and the fluid separation is realized by using vortex. The circulator provided by the invention can serve as a water pump, a slurry pump, a sewage pump, a blower, a compressor, spray equipment, a reactor, a steam turbine, vacuum equipment or a separator and be applied to wastewater treatment, seawater desalination, marine chemical engineering, mineral processing, waste disposal, hydrogen production, carbon dioxide decomposition, harmful gas decomposition, air purification, dedusting, dust absorption, refrigeration, oxygen production, oil refining and the like; and the blue sky and water can be completely realized, and foamed materials can be produced so as to bring a material revolution.