Plunger type slime pump constant pressure drop plunger water spray control system

The utility model provides a plunger type slime pump constant pressure drop plunger water spray control system against the synchronous change between the water spray system pressure and the plunger output pressure of a traditional plunger. A frequency converter installed on a flushing pump motor conducts the frequency converting control on the variable frequency starting of the flushing pump motor, and a flushing pump outlet pressure sensor installed on a flushing pump outlet pipe conducts real time monitoring on flushing water pressure; a slime pump outlet pressure sensor is installed on a slime pump connected with a flushing pump through the flushing pump outlet pipe and the slime pump outlet pressure sensor conducts real time monitoring on slime pump outlet pressure, input signals of the flushing pump outlet pressure sensor and the slime pump outlet pressure sensor get access to a flushing pump frequency converting control system to control the flushing water pressure to vary with slime pump output pressure. By means of the plunger type slime pump constant pressure drop plunger water spray control system, it is guaranteed that the flushing water pressure is greater than the slime pump output pressure in real time, and the flushing water pressure is within a controllable range. A high pressure water ring can be formed by flushing water inside the plunger to seal, lubricate and effectively support the plunger, and the defect of short service life of the traditional flushing pumps is improved.