Centrifugal Pump Impeller with Variable External Channel Width
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Solution Overview
Problem
Conventional centrifugal pumps face difficulties in achieving high head pumping in small flow rate ranges due to a large channel area in the external channel, which increases energy consumption and requires excessive pump power.
Innovation Solution
The impeller design features an internal channel with a predetermined passage diameter for solid matter discharge and an external channel with a narrower channel width than the outlet, reducing the discharge flow rate and creating a sharply inclined head curve, allowing for high head pumping with reduced energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the channel area in the external channel is increased to improve solid matter discharge capability, then the passage diameter is enlarged, but the discharge flow rate increases excessively leading to high energy consumption
Solution Approach 1:
The patent applies different channel width characteristics to different parts of the external channel. Specifically, a first channel width is provided in a first region and a second channel width narrower than the first is provided in a second region. This local differentiation allows the channel to maintain adequate passage for solids in the first region while restricting overall flow rate in the second region, thereby reducing energy consumption without compromising solid matter discharge capability.
2Stress or pressure
If the pump power is increased to achieve high head pumping, then the head increases, but the energy consumption and required pump power become excessive
Solution Approach 1:
The patent changes the geometric parameters of the external channel by providing different channel widths in different regions. The second channel width in the second region is specifically designed to be narrower than the first channel width, creating a flow restriction that generates a sharply inclined head curve. This allows the pump to achieve high head pumping capability without requiring excessive pump power, as the narrowed channel creates backpressure that increases head efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables high head pumping in small flow rate ranges with equivalent power to conventional pumps, suppressing energy consumption and maintaining pump efficiency without vortex generation or sudden channel width increases.
Implementation Method 1
an impeller and a casing as essential components... an impeller body in which an internal channel is formed, the internal channel extending inside the impeller body in a direction of a rotation axis spirally about the rotation axis
Data Source
AI summary
An example impeller includes: an impeller body in which an internal channel is formed, the internal channel extending inside the impeller body in a direction of a rotation axis spirally about the rotation axis to connect an inlet and an outlet; and at least one centrifugal vane provided in the impeller body. The internal channel including the inlet and the outlet has a predetermined passage diameter. An external channel is formed so as to continue to the outlet and go around the circumferential surface of the impeller body, the external channel being defined by the centrifugal vane and being recessed inward in the radial direction from the circumferential surface of the impeller body. At least a part in a flow direction of the external channel has a channel width in the direction of the rotation axis smaller than the width of the outlet.