The invention discloses a high-pressure sealed
nitrogen spring. A
nitrogen cylinder component filled with
nitrogen is placed in oil in an oil cylinder component. The oil cylinder component comprises an oil cylinder cavity
plunger and an oil cylinder body, a space between the oil cylinder cavity
plunger and a guide sleeve is sealed, the oil cylinder cavity
plunger is movably connected with the guide sleeve, a space between the guide sleeve and the oil cylinder body is sealed, and the guide sleeve is fixedly connected with the oil cylinder body. The
nitrogen cylinder component comprises a
nitrogen cylinder end cover, a
nitrogen cylinder body and a nitrogen cavity plunger, wherein the lower end of the nitrogen cavity plunger is placed on the bottom face of the oil cylinder body, the upper end of the nitrogen cavity plunger is inserted into an inner cavity of the nitrogen cylinder body, and the nitrogen cylinder end cover is arranged at the top of the nitrogen cylinder body. By the adoption of the structure that the nitrogen cylinder component is sealed by oil contained in the oil cylinder component, sealing of the nitrogen spring is effectively achieved under high temperature and
high pressure, structural design is simple and reasonable, manufacturing cost is low, a nitrogen
system is controlled stably, and temperature change is controlled stably; meanwhile, due to the lubricating function of the oil, the oil cylinder component and the nitrogen cylinder component have very good
lubricity.