First, the concept of self-priming pump and classification:

1, pump means do not need to be filled with water can be automatically pumped water centrifugal pump known as the self-priming pump in suction line. Most suction pump with an internal combustion engine matching, mounted on a movable trolley, suitable for field work.

2, structure type self-priming pump is mainly divided into two types: external mixing self-priming pump and within the mixed-type self-priming pump.

Second, self-priming pump works:

    1, external mixing self-priming pump works is: before the pump starts to pump casing filled with water (or pump housing there own water). After starting the high-speed rotation of the impeller channel impeller in the water to the volute, then the entrance to form a vacuum, so that the inlet check the door is opened, the intake air tube into the pump and reaches the outer edge of the impeller through the channel. On the other hand, the impeller is discharged to the gas-water separation chamber of water but also by the backwater hole flow back around the outer edge of the impeller. Left backwater hole flow back into the water under the action of pressure difference and gravity, fired at the impeller channel, and impeller crushed, and after the air suction line to mix and directed spiral flow to the direction of rotation. Then with the right backwater hole to flow mingled along the volute flow. Since the liquid in the volute continue to impact the cascade, constantly being crushed impeller, on the strong mixing with air to produce a mixture of gas and water, and we will continue to flow so that air and water can not be separated. The mixture was stripped in the tongue volute outlet, along the short tube into the separation chamber. It is separated in the air separation chamber out from the outlet pipe to drain, and the water still flows through the impeller backwater hole around the outer edge, and mixed with the air suction pipe. This repeated cycle, and gradually the suction pipe in the air drained, the water enters the pump, complete self-absorption process.

    2, inner recirculation pump, the same works the outer recirculation pump, the difference is only the outer edge of the impeller backwater does not flow, and the flow of the impeller inlet. Internal - mixing self-priming pump at startup, required to open the return valve before the bottom of the impeller, so that the liquid flows back to the pump impeller inlet. Of water at high speed rotation of the impeller action mixed with air suction pipe to form a mixture of gas and water discharge to the separation chamber. Here the water and from the air discharge and return valve to return to the impeller inlet. This is repeated until the air to drain suction Sheung Shui.

    Priming pump is self-priming height, and impeller seal gap before, the number of revolutions of the pump, the separation chamber liquid height and other factors. Impeller before sealing the smaller the gap, the greater the height of self-absorption, and generally 0.3 to 0.5 mm; when the gap increases, in addition to self-priming height decrease, the pump head, efficiency decreased. Self-priming pump impeller with a high degree of circumferential speed u2 increases, but when the maximum height of self-absorption, self-absorption and increase the number of revolutions will not increase the height, then just shorten the time self-priming; when the number of revolutions when dropped, self-priming height, along with the decline. In other conditions remain unchanged, self-priming height also increases storage height increase (but not exceeding the optimum storage height of the separation chamber). Self-priming pump in order to better enable the air-water mixing, the impeller blades to be less, so that the pitch of the cascade increases; and should adopt the semi-open impeller (impeller or impeller channel wide), which is more convenient for backwater fired into the impeller cascade depth in.

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