Screw Spindle Pump Motor Cooling Without Rotative Seals
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Solution Overview
Problem
Existing screw pumps lack an efficient cooling mechanism for the drive engine and rely on rotative sealing elements that are prone to wear and tear.
Innovation Solution
The screw pump design incorporates an axial fluid outlet that allows a portion of the pressurized fluid to flow through a sealless hole along the drive shaft into the drive engine for cooling, eliminating the need for rotative sealing elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a radial outlet connection is used for fluid discharge, then the pump structure is simple, but the drive motor cannot be cooled effectively
Solution Approach 1:
The axial outlet connection serves dual functions: it discharges pumped fluid and simultaneously channels cooling fluid to the drive motor. This multi-functionality resolves the contradiction by integrating cooling capability into the existing outlet structure without adding separate cooling pathways.
Solution Approach 2:
The outlet connection is divided into two separate inlets: one for pumped fluid discharge and one for cooling fluid supply. This segmentation allows independent optimization of each function while maintaining a compact overall structure.
2Reliability
If rotative sealing elements are used at the drive shaft, then the sealing function is achieved, but wear and reliability issues occur
Solution Approach 1:
The sealing function is extracted from the rotating drive shaft and transferred to a stationary seal at the housing. This eliminates rotative sealing elements that are prone to wear, achieving the sealing function through a static interface between the drive shaft and housing.
Solution Approach 2:
The mechanical rotative sealing system is replaced with a stationary sealing arrangement. The seal is fixed in the housing and interfaces with the rotating drive shaft without being attached to it, substituting a wear-prone mechanical sealing system with a more reliable stationary sealing mechanism.
3Temperature
If the drive motor is cooled by diverting pumped fluid, then cooling is achieved, but sealing elements subject to rotational stress are required
Solution Approach 1:
The sealing function is extracted from the rotating components and placed in a stationary housing seal. This allows cooling fluid to be diverted through the drive motor without requiring rotative sealing elements, as the seal remains stationary and is not subject to rotational stress.
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 provides active cooling for the drive engine, enhancing efficiency and engine power, while eliminating the risk of wear associated with rotative sealing elements.
Implementation Method 1
a part of the fluid flowing from the fluid outlet of the spindle housing flows through the sealless bore along the drive shaft into the drive motor, cools it
Data Source
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AI summary
A 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, 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), and a drive motor (11) comprising a drive shaft (12) which runs through a bore (23) in a housing wall (15) axially closing the interior of the outer housing (5) and is coupled to the drive spindle (12), wherein a portion of the fluid flowing from the fluid outlet of the spindle housing (2) flows through the sealless bore (23) along the drive shaft (12) into the drive motor (11), cooling it. and flows back into the outer casing (5).