Rotary feeding device

The invention relates to a feeding device used for feeding material equipment, in particular to a rotary feeding device. The rotary feeding device is used for supplying material to the material equipment, wherein the material is gas or liquid or powder solids. The rotary feeding device comprises a rotary shaft and an outer ring, the rotary shaft is sleeved with the outer ring, the outer ring can rotate relative to the rotary shaft, and at least one annular sealed cavity which surrounds the rotary shaft is formed by the outer side face of the rotary shaft and the inner side face of the outer ring. Each annular cavity is communicated with the first end of at least one channel located inside the rotary shaft and the first end of at least one channel located in the outer ring. The second end of each channel located in the rotary shaft is communicated with the exterior of the rotary shaft from the exposed position of the surface of the rotary shaft, the second end of each channel located in the outer ring is communicated with the exterior of the outer ring from the exposed position of the surface of the outer ring, the second ends of the channels in one of the rotary shaft and the outer ring are used for being communicated with a material source to take the material from the material source, and the other one is used for fixing the material equipment. The second ends of the channels in the other one are used for being communicated with the material equipment to supply the material to the material equipment.