Elastic displacement compensating fixed-connection unit and deep sea multi-pressure-body combined type pressure structure

The invention discloses an elastic displacement compensating fixed-connection unit and a deep sea multi-pressure-body combined type pressure structure. The elastic displacement compensating fixed-connection unit comprises a circular disc-shaped pre-tightening cover, a locating cylinder section, an elastic element, a displacement compensation element and a sliding coating; the displacement compensation element is mounted at the internal bottom of the locating cylinder section; the sliding coating is plated on the external bottom surface of the displacement compensation element; the elastic element is mounted above the displacement compensation element; and the circular disc-shaped pre-tightening cover is screwed into the upper portion of the locating cylinder section and compresses the elastic element so as to push the displacement compensation element by using the elastic element. According to the elastic displacement compensating fixed-connection unit and the deep sea multi-pressure-body combined type pressu