Screw Spindle Pump With 360° Pressure-Balancing Fluid Chamber
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Solution Overview
Problem
Existing screw spindle pumps experience asymmetric pressure distribution and local pressure increases, leading to deformations and operational issues, particularly when using softer materials like plastic.
Innovation Solution
A 360° radial fluid chamber is introduced between the spindle housing and outer housing, providing a symmetrical pressure distribution and stabilizing the spindle housing by applying radial pressure through a fluid jacket.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an axial inlet connection is provided off-center on the outer housing, then the fluid can be conveyed through the pump, but asymmetric pressure distribution occurs leading to local pressure increases and deformations of the spindle housing
Solution Approach 1:
The invention introduces a deliberate asymmetric element (the off-center axial inlet connection) and compensates for it by creating a symmetric counterbalancing structure (the 360° radial fluid chamber). The asymmetric fluid inlet creates localized pressure, but the circumferential fluid chamber distributes pressure uniformly around the spindle housing, counteracting the asymmetric loading and preventing deformations.
Solution Approach 2:
The radial fluid chamber extending 360° around the spindle housing creates an equipotential pressure distribution. By ensuring the fluid chamber surrounds the entire spindle housing circumferentially, the pressure is equalized at all radial positions, eliminating the asymmetric stress concentrations that would otherwise occur due to the off-center inlet connection.
2Power
If high pump pressure is generated, then the pump can effectively convey fluid, but local pressure increases cause deformations of the spindle housing
Solution Approach 1:
The radial fluid chamber acts as a counterbalancing pressure system. The high pump pressure generated for fluid conveyance is counteracted by the distributed pressure from the radial fluid chamber acting on the outer surface of the spindle housing. This creates a balancing effect where the internal pressure forces are counterweighted by the external fluid pressure, preventing deformations.
Solution Approach 2:
The invention changes the pressure distribution parameter from localized/high-gradient to uniform/distributed. By introducing the radial fluid chamber that extends 360° around the spindle housing, the pressure parameter is transformed from concentrated local pressure increases to a uniformly distributed pressure field, eliminating the shape-changing stress concentrations.
3Ease of manufacture
If the spindle housing is made of softer material like plastic, then manufacturing is easier and cost is reduced, but the housing is more susceptible to pressure-induced deformations
Solution Approach 1:
The radial fluid chamber serves as an intermediary pressure-distributing element between the pump's internal high-pressure fluid and the spindle housing structure. Instead of the high-pressure fluid directly loading the plastic spindle housing, the fluid chamber mediates by distributing the pressure uniformly, allowing softer materials to withstand the operating pressures without deformation.
Solution Approach 2:
The invention changes the mechanical loading parameter on the spindle housing from concentrated high-stress to distributed low-stress. By using the radial fluid chamber to distribute pressure uniformly around the housing, the stress parameter is reduced at any given location, enabling the use of softer, easier-to-manufacture materials like plastic that would otherwise be too weak to withstand localized high pressures.
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 stabilizes the spindle housing, reduces deformations, and minimizes flow noise, while allowing the use of softer materials like plastic, even at high pump pressures.
Implementation Method 1
a radial outlet connection, via which the pressurized fluid exits radially. In the area of this radial outlet bore of the spindle housing and the narrow connecting space, i.e. the pressure side, the conveyed fluid is present at a correspondingly high pump pressure, so that a high local pressure is exerted on the spindle housing
Data Source
Figure 1~2
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Figure 4
AI summary
Screw spindle pump, comprising a spindle housing (2) in which a drive spindle (3) and at least one meshing running spindle (4) are received in spindle bores (28), and an outer housing (5) enclosing the spindle housing (2), on which an axial inlet port (6) and a radial outlet port (9) are provided, wherein the spindle housing (2) has an axial fluid outlet for the fluid conveyed through the spindle housing (2) via the drive and running spindles (3, 4), which communicates with a fluid chamber (10) extending by 360° formed between the spindle housing (2) and the outer housing (5), which in turn communicates with the radial outlet port (9).