Anti-dry rotation protection device for screw pump

The utility model discloses an anti-dry rotation protection device for a screw pump, relates to the field of screw pumps, and solves the problem that an existing screw pump is possibly damaged due to dry rotation caused by lack of liquid. According to the technical scheme, a top hole is formed in the top of a suction chamber of the screw pump, a bottom hole is formed in the bottom of the suction chamber of the screw pump, the top hole and the bottom hole are connected through a communicating pipe, and a high liquid level sensor and a low liquid level sensor are arranged on the communicating pipe. The installation height of the high liquid level sensor is located between the center of the suction chamber and the top hole, the installation height of the low liquid level sensor is located between the center of the suction chamber and the one-third height from the bottom hole to the top hole, and the high liquid level sensor and the low liquid level sensor are electrically connected with the relay controller. The