Water circulation device for combined sewage-suction vehicle

The utility model discloses a water circulation device for a combined sewage-suction vehicle. The water circulation device comprises a power set, a transfer case, a high pressure water pump, a water tank, a dredging water pipe, and a high pressure nozzle disposed on a tail end, wherein the power set transmits power to the transfer case through a transmission shaft, the transfer case transmits the power to the high pressure water pump which is connected to the water tank through a water pipe A, and the water tank and the dredging water pipe are connected to a water pipe B via a three-way valve with the water pipe B disposed between the water tank and the dredging water pipe. According to the device, the problem of water waste caused by simultaneous working of a hydraulic gear pump and a high pressure water pump of a conventional combined sewage-suction vehicle during dredging operations is solved. The water circulation device for the combined sewage-suction vehicle is scientific and reasonable in structure, lo