Oil-submersible linear motor

The invention discloses a submersible linear motor, comprising a stator and a rotor which carries out linear motion in the stator; the stator comprises a stator internal pipe, a stator external pipe which is sheathed outside the stator internal pipe and a plurality of silicon steel rings and coils which are arranged between the stator external pipe and the stator internal pipe in axial array; the submersible linear motor also comprises at least a joint which is arranged at the ends of the stator external pipe and the stator internal pipe; the connection between the joint and the stator external pipe and connection between the joint and the stator internal pipe are respectively provided with a sealing ring; the joint is closely matched with the stator external pipe and the stator internal pipe so as to form a sealing chamber; the submersible linear motor works under oil wells and is connected with an oil pump. In the submersible linear motor, the joint is closely matched with the stator internal pipe and the stator external pipe by the sealing ring and forms a sealed chamber together with the stator internal pipe and the stator external pipe, thus ensuring the sealing performance of elements which are arranged between the stator internal pipe and the stator external pipe and blocking the entrance of the external oil, water and the like.