Screw Spindle Pump Layout With Seal-Free Motor Cooling
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Solution Overview
Problem
Screw spindle pumps face challenges with fluid distribution and sealing, leading to inefficiencies and wear in the drive motor and spindle housing due to asymmetrical pressure distribution and the use of rotationally stressed sealing elements.
Innovation Solution
The screw spindle pump design incorporates an axial fluid outlet for the spindle housing, allowing pressurized fluid to cool the drive motor and return, eliminating the need for rotationally stressed sealing elements by using a seal-free bore and annular gap for fluid flow, and a 360° radial fluid chamber to stabilize the spindle housing with symmetrical pressure application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an axial inlet connection is provided eccentrically on the external housing, then the fluid can flow to the spindle housing, but asymmetrical pressure distribution occurs leading to inefficiencies and wear
Solution Approach 1:
The patent applies asymmetry by providing the axial inlet connection eccentrically on the external housing, deliberately creating an asymmetrical flow path that directs fluid to cool the drive motor while maintaining reliable operation through controlled asymmetrical pressure distribution
2Reliability
If rotationally stressed sealing elements are used for the drive shaft, then sealing is achieved, but wear and reliability issues occur
Solution Approach 1:
The patent extracts the problematic rotationally stressed sealing elements from the system by providing a seal-free bore through the housing wall, allowing the drive shaft to pass without rotational seals, thereby eliminating wear while maintaining the necessary sealing function through alternative means
Solution Approach 2:
The patent uses hydraulic principles by allowing pressurized fluid to flow through the seal-free bore along the drive shaft to cool the drive motor, replacing mechanical sealing with fluid-based sealing and cooling
3Volume of moving object
If the drive motor is located inside the external housing, then compact design is achieved, but cooling becomes difficult without rotationally stressed seals
Solution Approach 1:
The patent applies multi-functionality by using the conveyed fluid for dual purposes: maintaining the asymmetrical pressure distribution for reliable pump operation and simultaneously cooling the drive motor through the seal-free bore, eliminating the need for separate cooling systems
Solution Approach 2:
The patent uses hydraulic cooling by directing pressurized fluid through the seal-free bore along the drive shaft to cool the drive motor, replacing mechanical sealing with fluid-based cooling and sealing
4Productivity
If a radial outlet connection is used, then fluid discharge is achieved, but additional cooling function is not provided
Solution Approach 1:
The patent applies multi-functionality by configuring the axial inlet connection to serve dual purposes: maintaining asymmetrical pressure distribution for reliable pump operation and providing cooling flow to the drive motor, while the radial outlet continues its primary discharge 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 design enhances motor efficiency through active cooling and reduces wear by eliminating rotationally stressed seals, while stabilizing the spindle housing with symmetrical pressure, improving pump performance and longevity.
Implementation Method 1
a part of the fluid flowing out of the fluid outlet of the spindle housing flows through the seal-free bore along the drive shaft into the drive motor, cools this drive motor and flows back into the external housing
Data Source
AI summary
A screw spindle pump having a spindle housing in which a drive spindle and at least one running spindle meshing therewith are received in spindle bores, and an external housing which accommodates the spindle housing, an axial inlet connection and a radial outlet connection being provided on the external housing. The spindle housing has an axial fluid outlet for the fluid conveyed via the drive spindle and the running spindle through the spindle housing, as well as a drive motor having a drive shaft which runs through a bore in a housing wall, which axially closes the interior of the external housing, and which is coupled to the drive spindle. A part of the fluid flowing out of the fluid outlet of the spindle housing flows through the seal-free bore along the drive shaft into the drive motor, cools this drive motor and flows back into the external housing.