Screw Spindle Pump With 360° Pressure Chamber Stabilization
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Solution Overview
Problem
Screw spindle pumps face issues with local excessive pressure and deformation due to unsymmetrical pressure distribution, particularly when manufactured from softer materials, which can lead to operational inefficiencies and potential damage.
Innovation Solution
A screw spindle pump design featuring a 360° annular fluid chamber between the spindle housing and outer housing, providing radial pressure stabilization and ensuring symmetrical pressure conditions, which avoids local pressure increases and deformations by allowing axial fluid exit and deflection into a radial pressure chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a narrow connecting space is provided between the spindle housing and outer housing for fluid flow, then the pump can deliver fluid at high pressure, but local excessive pressure and deformation occur on the spindle housing
Solution Approach 1:
The fluid outlet structure is segmented into two distinct parts: an axial fluid outlet opening on the spindle housing and a separate radial fluid chamber in the outer housing. This segmentation allows the high-pressure fluid to be delivered axially while the radial chamber distributes the pressure uniformly, preventing local excessive pressure and deformation on the spindle housing.
Solution Approach 2:
The radial fluid chamber acts as an intermediary between the axial fluid outlet and the radial outlet port. The chamber receives the high-pressure fluid axially from the spindle housing and redistributes it radially through its 360° annular structure, mediating the pressure distribution to avoid concentrated loads on the spindle housing.
2Ease of manufacture
If softer materials are used for the spindle housing, then manufacturing complexity and cost are reduced, but the housing becomes more susceptible to pressure-induced deformation
Solution Approach 1:
The radial fluid chamber creates equipotential pressure distribution around the spindle housing by surrounding it with fluid at uniform pressure. This equalizes the pressure loading on all sides of the housing, preventing localized stress concentrations that would cause deformation, thereby enabling the use of softer, easier-to-manufacture materials.
3Device complexity
If an axial inlet port is provided on the outer housing, then the pump structure is simplified, but the fluid flow path creates unsymmetrical pressure distribution
Solution Approach 1:
The invention intentionally introduces asymmetry through the axial fluid outlet opening on the spindle housing, which breaks the symmetry of the traditional radial outlet configuration. This asymmetric axial outlet feeds into the radial chamber, creating a flow path that distributes pressure uniformly around the housing, thereby achieving symmetrical pressure distribution despite the asymmetric outlet orientation.
Data Source
AI summary
A screw spindle pump having a spindle housing, in which a drive spindle and at least one running spindle which meshes therewith are received in spindle bores, and having an outer housing which encloses the spindle housing and on which an axial inlet port and a radial outlet port are provided, wherein the spindle housing has an axial fluid outlet for the fluid delivered through the spindle housing by the drive spindle and the running spindle, which axial fluid outlet communicates with a fluid chamber, which is formed between the spindle housing and the outer housing, extends around 360°, and in turn communicates with the radial outlet port.