Axial-flow water pump with blades turning at the water inlet side

Abstract

The invention provides an axial flow type water pump with a foldable blade water inlet side. The axial flow type water pump comprises a bade, two sections of concentric pivots, crank arms with different lengths, connecting rods with the same length and an operating frame, wherein the blade is divided into front and rear sections at the part of a rotating shaft; the front and rear sections of blades can rotate around the axis, are combined by adopting a cylindrical surface and are mounted on a hub through the pivots; and the pivots pass the crank arms and are connected to the operating frame through the connecting rods. When the operating frame moves up and down, as the crank arms have different lengths, the rotating radii are also different, and the front section of blade, namely the water inlet side, can be folded while the placing angle of the whole blade is changed. As a result, the molded lines of the front and rear sections of blades can be regulated into different angles within a certain range. The water pump enables the placing angles of the inlet and the outlet of the blade to adapt to the turning angle of water flow, so that hydraulic losses can be reduced. The efficiency of the pump is improved, and the cavitation performance of the pump is improved.

Description

technical field [0001] The invention relates to a pump, in particular to an axial-flow water pump whose water inlet side can be turned. Background technique [0002] Vane pumps are widely used in fields such as farmland irrigation, drought resistance and drainage, ecological environment improvement, and water diversion projects. When the existing low-lift axial flow pumps adopt the blade adjustment method, the placement angle of the blades varies with the water level difference between the upstream and downstream ( That is, the head) or the flow change needs to change. When the head decreases or a large flow is required, the blade placement angle increases, otherwise the blade placement angle decreases. In this way, the inlet angle of attack of the blade can be closer to the direction of the water flow, and the impact loss can be reduced. According to relevant test data, when there is no backflow in the impeller of the axial flow pump, the water flow at the impeller inlet d...

AI Technical Summary

Problems solved by technology

Since the guide vanes are not rotating parts and act differently from the pump blades, the pump cannot operate efficiently over a wide area when operating conditions change

[0012] CN102588329A is the previous research result of the inventor, which can better improve the flow state of the liquid in the pump and improve the cavitation performance. However, in this technology, the pump is connected to the operating frame with crank arms of the same length and connecting rods of different lengths. Such a setting still has some disadvantages, especially it cannot effectively adapt to the requirements of the water inlet attack angle and outlet water flow angle under different working conditions, and the work efficiency still needs to be improved.

Increase the angle of attack so that the lift coefficient C y increase, but the flow around the blade will deviate from the better quality coefficient C y / C x , resulting in a possible increase in loss, which is always a contradiction

[0014] Obviously, when the operating parameters change, the efficiency will still be affected although the blade placement angle of the impeller can be adjusted to maintain a wider operating area.

After deviating from the optimal working point, the efficiency and cavitation performance will drop more, the economic benefit will decrease, and the energy consumption will increase

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