Two-Stage Pump Segmented Chambers for Flow Efficiency
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Solution Overview
Problem
Existing two-stage pumps face challenges in achieving high volumetric efficiency, precise limit pressure setting, and operational reliability due to shared pressure valves and interconnected pumping chambers, leading to inefficiencies and wear on reciprocating pistons.
Innovation Solution
The design features separate reciprocating pump elements with independent pumping chambers and valves, a switching valve that routes flow efficiently to a tank at the limit pressure, and a compact housing configuration that allows for precise pressure control and low-loss flow paths, ensuring high volumetric efficiency and structural simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the low-pressure and high-pressure delivery chambers are connected via the suction valve of the high-pressure delivery chamber, then the pump can deliver high flow rates at low pressures, but the pressure valve must be impractically large to cope with combined delivery flows
Solution Approach 1:
The patent divides the delivery system into separate low-pressure and high-pressure delivery chambers with independent pressure valves. Each chamber handles its own flow separately, eliminating the need for an oversized pressure valve that would be required to handle combined flows simultaneously. The low-pressure chamber has its own pressure valve sized for low-pressure flows, and the high-pressure chamber has its own pressure valve sized for high-pressure flows.
2Device complexity
If the low-pressure reciprocating piston is connected to the high-pressure reciprocating piston with a common return spring, then the structure is simplified, but the reciprocating pistons are subject to heavy wear
Solution Approach 1:
The patent separates the drive mechanisms for the low-pressure and high-pressure reciprocating pistons, giving each piston its own return spring. This segmentation prevents the heavy wear that would occur if both pistons were connected and subjected to combined forces, while maintaining reasonable structural complexity through the use of a common drive shaft.
3Reliability
If the two pump elements work independently with separate pumping chambers and valves, then volumetric efficiency increases, but the device complexity increases
Solution Approach 1:
The patent combines two independently operating pump elements into a single integrated device with a common drive shaft and housing. While the pump elements operate independently with separate pumping chambers and valves to maintain high volumetric efficiency, they are merged into one compact unit that reduces overall device complexity compared to having completely separate pump systems.
4Loss of energy
If the switching valve routes low-pressure flow to the tank when pressure exceeds limit pressure, then energy losses are reduced, but the housing channel complexity increases
Solution Approach 1:
The patent uses a switching valve as an intermediary device that automatically routes low-pressure flow to the tank when the limit pressure is exceeded. This mediator component manages the complex flow path logic without requiring complex housing channels, as the switching valve itself handles the decision-making and routing function.
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 volumetric efficiency, precise limit pressure setting, and reduced wear on components, allowing the two-stage pump to efficiently manage flow rates and reach high working pressures with minimal losses and structural complexity.
Implementation Method 1
a closing element (11) that can be adjusted against a prestressing spring (10) from the shut-off position shown to an open position
Implementation Method 2
the pressure in the pressure outlet keeping the pressure valve of the low-pressure pump element closed, so that no part of the delivery flow
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The pump (P) has a high-pressure and low-pressure pumping element (H,N) for small and high flow rate, and common pressure outlet (2). A switching valve (9) arranged between low-pressure pumping element and tank is opened to tank dependent on pressure in discharge outlet, such that piston pump elements of two pumping elements are equipped with suction and pressure valves (4,5). A common housing is shared by suction and discharge valves and changeover valve (9), so that piston (16,17) is divided into separate high-pressure and low-pressure delivery spaces (3,6).