Damper

An inner pipe comprises two inner pipe sections, an outer pipe is arranged outside the two inner pipe sections in a sleeving mode, a friction energy dissipation part is located in the outer pipe and comprises a lead screw and an internal thread sleeve part, the lead screw is sleeved with the internal thread sleeve part, the internal thread sleeve part is in threaded fit with the lead screw, and the two opposite ends of the two inner pipe sections are connected through the lead screw; the internal thread sleeve piece and the outer pipe are positioned and matched in the axial direction of the outer pipe, and the internal thread sleeve piece and the outer pipe are tightly attached in the direction around the lead screw to form a rotating friction pair; the two inner pipe sections are sleeved with elastic parts; the inner wall of the outer pipe is provided with a first limiting part and a second limiting part in the opposite area of each inner pipe section, each inner pipe section is sleeved with a first pressing