Submersible Pump Coupling Base Vertical Ball Sealing
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Solution Overview
Problem
Existing coupling bases for submersible motor pumps in sewage collection shafts face issues with backflow prevention due to oblique ball movement, leading to increased lateral dimensions and reliance on water pressure for sealing, which can result in premature ball displacement during pressure surges, causing unnecessary pumping.
Innovation Solution
A coupling base design where the ball is guided for vertical movement only, with a horizontally aligned sealing seat at the lower end, ensuring sealing force through the ball's weight, and incorporating a spring tongue for rotation, allowing new sealing surfaces to be used, and a cage formed from twisted bars for enhanced movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the ball performs mixed motion (sideways and up and down) to open the flow passage, then the sealing position is achieved, but the lateral dimensions of the coupling foot become relatively large
Solution Approach 1:
Instead of allowing the ball to move obliquely (sideways and up), the invention inverts the approach by guiding the ball to move only vertically through a cage structure. The sealing seat is positioned at the top of the vertical path, and the ball opens the passage by moving straight up, eliminating sideways movement and reducing lateral dimensions.
Solution Approach 2:
The coupling foot is divided into functional sections with the cage structure separating the ball's movement path from the lateral space. The cage confines the ball to a narrow vertical path, while the sealing seat and outlet passage are arranged to accommodate this constrained motion, effectively segmenting the space requirements.
2Reliability
If the ball is pressed into a vertical sealing seat by water pressure, then sealing is achieved, but pressure surges cause the ball to leave the sealed position and trigger unnecessary pumping
Solution Approach 1:
The invention inverts the sealing mechanism by positioning the sealing seat at the top of the ball's vertical path rather than at the bottom. The ball seals by being pushed upward into the horizontal sealing seat, and the cage structure with vertical guidance prevents the ball from being displaced sideways by pressure surges, maintaining sealing reliability while allowing pressure variations.
Solution Approach 2:
The sealing mechanism transitions from relying on water pressure in a vertical plane to using the ball's weight and vertical positioning. The sealing force is generated by the ball being pushed into the horizontal sealing seat at the top of its vertical path, changing the dimension of the sealing action from pressure-based to position-based.
3Ease of operation
If the ball performs oblique movement for sealing, then sealing position is achieved, but the coupling foot requires larger lateral space
Solution Approach 1:
The invention inverts the traditional sealing approach by guiding the ball to move vertically upward into a horizontal sealing seat at the top, rather than moving obliquely into a vertical sealing seat at the bottom. This inversion eliminates the need for lateral space and reduces the coupling foot's lateral dimensions while maintaining effective sealing.
Solution Approach 2:
The sealing action is moved from the lateral dimension to the vertical dimension. The ball travels vertically through the cage and seals at the top against a horizontal seat, utilizing the vertical space within the coupling foot to achieve sealing without requiring additional lateral space.
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 design reduces the lateral dimensions of the coupling base, ensures reliable sealing without water pressure, and prevents premature wear by utilizing new surfaces, allowing for efficient operation and reduced likelihood of unnecessary pumping during pressure surges.
Implementation Method 1
the required sealing force is ensured solely by the weight of the ball, regardless of the water pressure
Implementation Method 2
a spring tongue protrudes into the path of movement of the ball and is sized to impart torque to the ball and cause it to rotate about its center point
Data Source
Figure 1
Figure 2
AI summary
The base has a housing, and a coupling part (2) for a motor, an outlet pipe connection and closable cleaning connecting pieces that are designed on an outer side of the housing. A backflow preventer in a form of a ball (4) and a sealing hub (8) for the ball are arranged on an inner side of the housing. The ball is guided into a retainer (3) for vertical movements, and the sealing hub is horizontally designed at a lower end of the ball.