| 摘要 |
The invention relates to an agricultural spray apparatus whereby chemical to be sprayed is injected into spray liquid before the mixture of liquid and chemical is sprayed. The invention comprises a closed loop circulating system having a pump with an inlet and an outlet, a loop line connecting the pump inlet and outlet, a spray nozzle connected to the loop line downstream of the pump via a spray line, a spray liquid inlet connected to the loop line upstream of the pump, a chemical injection system connected to the loop line upstream of the pump and downstream of the spray liquid inlet, a venturi device, a return line, an agitation line, and a valve device in the spray line, reversing liquid flowing to the spray nozzle through the agitation line past the spray nozzle and through the return line.
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