Double-Action Pump Changeover for Stable Spray Pressure
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Solution Overview
Problem
Reciprocating pumps in fluid spray systems experience pressure fluctuations during changeover due to halts in pumping, leading to increased downtime and undesirable pressure variations.
Innovation Solution
A controller signals the reciprocating plunger to stop and coordinates the closure and opening of inlet and outlet valves to overlap dwell times, ensuring the second set of valves opens only after the first set has fully closed, minimizing downtime and pressure fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If reciprocating pumps are used to provide spray pressure, then adequate spray pressure is achieved, but pressure fluctuations occur during changeover due to halts in pumping
Solution Approach 1:
The pump system is divided into two independent pumping circuits (first circuit with first pump and valves, second circuit with second pump and valves), allowing one circuit to be operational while the other undergoes changeover, thereby maintaining continuous stable pressure output
Solution Approach 2:
The controller coordinates valve operations in advance to ensure smooth transitions between pumping circuits, initiating valve closure and opening sequences that minimize pressure disruptions during changeover from first circuit to second circuit
2Adaptability or versatility
If reciprocating pumps halt during changeover to switch pump states, then pump switching is achieved, but downtime increases
Solution Approach 1:
While one pumping circuit undergoes changeover, the other circuit continues to operate and deliver spray pressure, ensuring continuous useful action without interruption to the spraying process
Solution Approach 2:
Valve operations are coordinated in advance to prepare the standby circuit for immediate operation, reducing the actual switching time when transitioning from active first circuit to standby second circuit
Data Source
AI summary
A method of actuating a double-action pump assembly with a reciprocating plunger includes signaling the reciprocating plunger to stop for a changeover period; while the pump is stopping, signaling the first inlet and outlet valves to close; while the first inlet and outlet valves are closing, signaling the second inlet and outlet valves to open, such that the second inlet and outlet valves begin to mechanically open at least a dwell period after the first inlet and outlet valves have entirely closed; and signaling the reciprocating plunger to begin moving while the second inlet and outlet valves are closing.