Control system for changing pressure of single water pump

The invention discloses a control system for changing pressure of a single water pump. The system comprises a flow control valve, a water sprinkle control valve, a sprinkling pump driving motor and a sprinkling pump; after flowing through the flow control valve and being measured, pressure oil enters the water sprinkle control valve, and the flow rate of the pressure oil entering the sprinkling pump driving motor is controlled through the water sprinkle control valve; the sprinkling pump is driven by the sprinkling pump driving motor to rotate, suck water from a water tank and drain the water into a sprinkling system; the sprinkling system achieves water sprinkle between a high pressure water route and a low pressure water route in a switched-over mode. The theoretical basis of the design is the energy conservation law of flowing liquid, and by changing the through-flow cross section, the matching between the pressure and the flow rate is achieved. According to the control system, the direction is switched over through a manually-operated ball valve, so that the switchover between a high pressure sprinkling loop and a low pressure sprinkling loop is achieved. By changing the circulation cross-sectional areas of the high pressure loop and the low pressure loop, the fluid pressure and flow rate are changed, and the control over change between the high pressure and the low pressure is achieved. The design cost is low, and the reliability is high; by means of the control system, the complexity degree of the system can be reduced ingeniously, the service life can be prolonged, and the product stability can be improved.