Internal locking retractable shower curtain rod and connector

An internal locking retractable connector, wherein the connector comprises a first connecting piece (10) and a second connecting piece (20);

• the first connecting piece (10) comprises a fixed part (110) and a screw part (120) which is integrally connected to the fixed part (110);
• the second connecting piece (20) comprises a threaded core (210) and a tensioning piece (220), the threaded core (210) comprises an internal thread part (2110) and a clearance (2120), the tensioning piece (220) comprises a tensioning sleeve (2210) with an open-ring structure, a wedge-shaped structure (2220) is arranged in the tensioning sleeve (2210), the tensioning piece (220) is wrapped around the outside of the threaded core (210) through the tensioning sleeve (2210) and the wedge-shaped structure (2220) extends into the clearance (2120);
• the screw part (120) of the first connecting piece (10) is arranged in the threaded core (210) of the second connecting piece (20) and connected to the internal thread part (2110) of the threaded core (210) through thread, when the screw part (120) of the first connecting piece (10) gradually rotates and retracts from the threaded core (210), the screw part can press the wedge-shaped structure (2220) to make the tensioning sleeve (2210) expand outward and deform.