Vertical Self-Priming Pump Backflow Gap Control
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Solution Overview
Problem
Self-priming pumps experience significant volume efficiency loss due to backflow gaps, leading to reduced efficiency, inability to reach normal flow and pump head, and increased energy consumption.
Innovation Solution
A vertical self-priming pump design incorporating a medium backflow blocking device with a static ring and moving ring, supported by an elastic sleeve, which blocks the backflow gap channel under liquid pressure, reducing volume loss and enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a backflow gap is provided between the impeller and flow guide body, then the pump can maintain self-priming functionality, but volume efficiency loss increases by about 8%
Solution Approach 1:
The patent employs a movable ring that can dynamically adjust its position along the impeller axis. During self-priming operation, the movable ring retracts to expose the backflow gap, enabling gas-liquid mixing. During normal operation, the movable ring extends to close the backflow gap, eliminating volume efficiency loss. This dynamic adjustment resolves the contradiction between maintaining self-priming functionality and reducing energy loss.
Solution Approach 2:
The patent changes the flow path parameters dynamically by adjusting the position of the movable ring. The backflow gap dimension changes from open to closed state based on operating conditions. This parameter change allows the pump to optimize performance for different operating modes, achieving both self-priming capability and high efficiency.
2Reliability
If a backflow gap is provided for self-priming operation, then gas can be discharged from the liquid inlet pipe, but the pump cannot reach normal flow and pump head
Solution Approach 1:
The movable ring provides dynamic control of the backflow gap opening. During self-priming, the gap is open to allow gas discharge. During normal operation, the gap is closed to achieve normal flow and pump head. This dynamic mechanism resolves the contradiction between gas discharge capability and normal operating performance.
3Reliability
If a backflow gap is provided, then self-priming can be achieved, but energy consumption increases
Solution Approach 1:
The movable ring dynamically closes the backflow gap during normal operation, preventing recirculation and reducing energy consumption. During self-priming, the gap opens to enable the self-priming process. This dynamic control resolves the contradiction between self-priming capability and energy 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
The solution improves pump efficiency by 5%-8% by eliminating backflow loss and maintaining self-priming functionality, while minimizing impeller wear and energy consumption.
Implementation Method 1
During normal working, the elastic supporting sleeve of the present invention in the medium backflow blocking device generates a downward deformation under the action of liquid medium pressure
Implementation Method 2
the impeller 1 rotates at a high speed to eliminate liquid medium in the impeller flow channel 2, so as to form negative pressure at the liquid inlet opening of the impeller 1 to suck gas in the liquid inlet pipe 4 into the pump cavity
Implementation Method 3
because the exit area of the impeller flow channel 2 becomes big suddenly, the flow velocity decreases suddenly, so the gas separates from the liquid
Implementation Method 4
the liquid medium sinks and flows back to the outer edge of the impeller 1 through the backflow gap 3 because it is heavy
Data Source
AI summary
The present invention claims a vertical self-priming pump which comprises a pump body, a motor and a medium backflow blocking device, the medium backflow blocking device comprises a static ring and a moving ring which are vertically and oppositely arranged, and an elastic supporting sleeve; the moving ring is embedded on the upper surface of the impeller, the elastic supporting sleeve is fixed on the upper surface of the flow guide body, and the static ring is embedded on the lower surface of an elastic supporting ring. During normal working, the elastic supporting sleeve of the present invention in the medium backflow blocking device generates a downward deformation under the action of liquid medium pressure, thus the moving ring and the static ring closely contact with each other and block the backflow gap channel, and the pump efficiency is improved.