What is a tangent pump, the working principle of tangent pump

the tangent pump, what is the tangent pump, the working principle of tangent pump

a, what is the tangent water pump

the tangent pump ( Also called a partial emission pump, high-speed pump) , by the American Sundyne company first research success, is mainly used in the rocket engine. In the petrochemical industry can also be part instead of vortex pump and multistage pump. At present this kind of pump speed can reach 30000 r/min head above 2000 m. When the specific speed of the centrifugal pump ns< 40, particularly in the case of small flow rate, because the width of the impeller and the pressurized water chamber throat area is too narrow, brings to the casting and machining are a lot of difficulties, and the characteristics of the pump is difficult to guarantee the design point is the point of the rate, so should not adopt the conventional design method of centrifugal pump, and the tangent pump design method should be adopted.

2, the working principle of tangent pump

tangent water pump flow components by suction pipe, the impeller, peripheral of annular space and discharge diffuser, as shown in figure 6 & ndash; 54.

no tangent pump impeller cover plate, is open, the blade is straight blade radiation type. The straight blade impeller rotation within the annular space, can approximate thought of fluid rotation speed and the rotation of the impeller speed is equal, namely & nu; = u, that is, no relative fluid relative impeller speed. In fact because of u is very high, the relative velocity is very small.

this is also the tangent pump features in particularly compelling. That is, the original form of dead lift pump clearance, stepan's proposed the most commonly used numerical value is 0. In the same impeller diameter, 57, under the same speed, tangent pump with the original type pump ( 1. 2 to 1. 4) Times of high lift and the lift used in the whole flow range is almost the same. Conversely, high lift coefficient, means that under the same rotational speed of impeller needed to generate the same head diameter is small, so low specific speed of the disc friction loss will correspond to reduce a lot.

in addition, the tangent pump within the scope of its practical use, the rotation of the pump shell basically do not have relative flow between fluid flow and the impeller, the impeller and water to keep the relationship between a rigid body. Therefore, it is different from the original form of pump, it has not caused by backflow from the mouth ring leakage loss, and even if there is a big gap between the impeller and casing is not affected, and the advantages of small disc friction loss, constitutes the tangent pump in ns< Within the scope of low specific speed 100 is of high efficiency.

it is commonly believed in the specific speed near ns = 56, tangent pump efficiency is highest, and the specific speed is more than 56, efficiency decline. Therefore, specific speed is more than 56 when there is no need to use tangent pump.

fluid in the impeller peripheral rotate at a speed of u2, is only part of the fluid at the entrance of diffusion tube output, most of the fluid in the annular space still spinning. And general centrifugal pump impeller flow of fluid flow to all of the pressurized water chamber output in the diffusion tube, so this kind of pump (also known as the partial emission water pump Some fluid flow out) 。

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the what is tangent pump, the working principle of tangent pump pump technology news articles by professional pump original.

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