The water pump of the water sprinkler truck adopts an external mixing type self-priming structure, and there should be an appropriate amount of liquid in the pump. After the pump is started, the impeller rotates, and negative pressure is formed at the inlet of the impeller, and the gas in the suction pipeline is mixed with the liquid in the pump, and enters the gas-liquid separation chamber through the press-out chamber.

Due to the difference in specific gravity of the gas and liquid, the gas is separated from the liquid and discharged from the outlet pipe, and the liquid sinks in the gas-liquid separation chamber. After many cycles, the gas in the suction pipe is discharged and filled with liquid, and the self-priming process is completed. The pump starts normal infusion. Therefore, in order to ensure that the pump has good self-priming performance, the following conditions must be met:

1. Before the pump works, the liquid stock in the pump must be higher than the pump shaft, so the pump inlet must be connected with an upwardly bent pipe and then a horizontal pipe and a quick connector. The center line of the quick connector must be 300 degrees higher than the center line of the pump shaft. mm.

2. The inlet piping system must ensure no air leakage.

3. The suction head of the suction pipe must be submerged in water to prevent air from being sucked into the water pipe.

4. When the outlet pipe is connected to the pump outlet, it must be ensured that the length of the straight pipe is ≥ 200 mm before connecting the elbow.

What should I do if the pressure of the sprinkler pump is low? First of all, the most likely problem is that the filter of the sprinkler is blocked, because the water loaded by the sprinkler cannot be all clean tap water, it may be a dirty pool or pumped water from a pond, so that there are too many impurities in the water, and the filter was blocked by debris, such as sand, plastic bags. Just remove the filter element in the filter screen and clean it, and it can resume normal work. The location of the filter screen is near the water pump of the sprinkler.

Another possibility is that the pressure of the sprinkler pump is insufficient, causing the sprinkler pump to not be able to pump water. The lack of pressure of the sprinkler pump is usually caused by two reasons:

a. The impeller flow channel or suction pipeline is blocked, or the impeller is worn and damaged.

b. The power is insufficient and the speed is too low.

If the impeller is damaged, the water pump needs to be replaced, the power is not enough, just increase the throttle.