Vacuum siphon device

According to the vacuum siphon device, a siphon tank is additionally arranged between a phenol-containing waste liquid tank and a centrifugal pump, negative-pressure water absorption of a water pump is changed into positive-pressure water absorption through the siphon tank, the use effect is good, operation is reliable, and the defect that normal operation of the water pump is affected due to water leakage of a bottom valve is overcome. According to the utility model, a vacuum pump and a gas-water separation tank can be saved, and a bottom valve does not need to be arranged on the water suction pipe, so that the engineering cost is saved, the operation is convenient, and the occupied area is small; impurities are prevented from entering the pipeline and the centrifugal pump along with water flow to cause pipeline blockage or abrasion aggravation of the centrifugal pump, meanwhile, the phenomenon that the impurities are accumulated at the bottom of the siphon tank to affect normal use of the siphon tank can be