Sealed and improved single-screw pump

The utility model relates to a sealed and improved single-screw pump, comprising a pump body and a packing box. The sealed and improved single-screw pump is characterized by further comprising a cooling water outlet, a water ring, a fluororubber sealing ring, a cooling water inlet and a stepless speed-regulating frequency converter; the pump body is internally provided with the packing box which is internally provided with the fluororubber sealing ring; the packing box is provided with a cooling water circulating system, the upper end of the packing box is provided with the cooling water inlet and the upper end of the packing box is provided with the cooling water outlet; and the cooling water inlet and the cooling water outlet are connected by the water ring in the packing box. The sealed and improved single-screw pump overcomes the problem of frequent leakage at the packing part, reduces the material loss, protects the environment, and simultaneously can regulate the rotating speed automatically according t