The function of the pump suction chamber is to direct the liquid in the inlet pipe uniformly to the impeller with minimal loss. Common suction chamber has three forms: First, the tapered tube suction chamber using retractable tapered tube, so that the liquid flow rate increased impeller necessary to import the flow rate. And the flow velocity distribution, radial can enter the impeller. He is mostly used in cantilever pumps. Inhalation chamber taper is generally 7 º ~ 18 º. Second, the annular suction chamber In this suction chamber, as the pump shaft through the suction chamber, formed in the pump shaft swirl zone, causing uneven flow velocity before the impeller, the liquid into the impeller impact and eddy current losses. This suction chamber used in multi-stage pump, multi-stage pump head higher, the loss of hydraulic losses in the suction chamber accounted for the proportion is not large. Third, the semi-spiral suction chamber The suction chamber cross-section is gradually reduced, can make the water flow in the aqueduct to accelerate, on the other hand makes the liquid before entering the impeller produced pre-rotation, reducing the pump head, However, the vortex area behind the pump shaft can be eliminated, so that the liquid flow can enter the impeller more evenly. There are separate ribs in the upper part of the spiral suction chamber in the direction of 45º. Semi-spiral suction chamber is widely used in double suction centrifugal pump and multi-stage scroll pump.
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