Water injection sealing body and method for online replacing nozzle of compressor water injection system

The invention provides a water injection sealing body which comprises a movable seal composed of a sealing ring, a static seal comprising a sealing cavity, and a pressing device used for pressing or loosening the static seal. The movable seal, the static seal and the pressing device are sequentially and adjacently arranged and are arranged in a cavity, wherein the cavity is provided with two gas cavity connectors, the first gas cavity connector 18 communicates with the static seal, and the second gas cavity connector 19 communicates with the pressing device. The invention further provides a method for online replacing a nozzle of a compressor water injection system. According to the water injection sealing body and the method, compressed gas in the compressor cannot be leaked and is not polluted when the nozzle is replaced online, and a very good sealing effect is achieved. 本发明提供种注水密封体，包括依次相邻设置的由密封环构成的动密封、含有密封腔体的静密封及用于压紧或放松所述静密封的压紧装置，所述动密封、静密封及压紧装置设置在腔体中，所述腔体开设有两气腔接口，所述第气腔接口18与所述静密封相通，所述第二气腔接口19与所述压紧装置相通。本发明还