Vacuum Pump Connection Nipple for Offset Compensation
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Solution Overview
Problem
Existing vacuum pumps with cup-shaped housings face challenges in reliably connecting to an external oil supply due to the need for precise alignment and sealing of the rotor shaft with the drive and lubricating oil bore.
Innovation Solution
A vacuum pump design featuring a plug connection nipple made of plastic or elastomer, with a stepped bore and engaging circumferential beads for secure and fluid-tight connection, allowing for axial and angular offset compensation without additional sealing elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a rigid connection member is used between rotor shaft and drive, then alignment precision is improved, but adaptability to manufacturing tolerances deteriorates
Solution Approach 1:
The connection member is made from elastomeric material, changing the physical parameter of rigidity to flexibility. This allows the connection member to adapt to axial and angular offsets while maintaining secure connection, resolving the contradiction between alignment precision and adaptability to manufacturing tolerances.
Solution Approach 2:
The connection member is designed as a flexible elastomeric plug that can deform to accommodate misalignments. This flexible structure enables the system to adapt to offset conditions while maintaining functional connection between the rotor shaft and drive.
2Reliability
If multiple sealing elements are added to ensure fluid-tight connection, then sealing reliability is improved, but device complexity increases
Solution Approach 1:
The sealing function is merged into the connection member itself. The elastomeric material provides both mechanical connection and sealing functions in a single integrated component, eliminating the need for separate sealing elements and reducing overall device complexity while maintaining sealing reliability.
Solution Approach 2:
The connection member serves multiple functions simultaneously: it provides mechanical connection, accommodates misalignments, and creates fluid-tight sealing. This multi-functional design eliminates the need for additional dedicated sealing components.
3Manufacturing precision
If manual alignment and assembly is performed, then connection precision is improved, but installation time increases
Solution Approach 1:
The elastomeric connection member performs self-alignment during installation. The material's flexibility allows it to automatically accommodate and correct minor misalignments without requiring precise manual positioning, enabling simple automated installation while maintaining connection precision.
Solution Approach 2:
The elastomeric material properties enable the connection member to deform and self-adjust during installation, providing self-alignment capability that eliminates the need for time-consuming manual alignment procedures while maintaining connection precision.
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
Ensures reliable, automated, and secure connection to an external lubricating oil supply, preventing faulty insertions and optimizing lubricating oil distribution while compensating for misalignments and providing a fluid-tight seal.
Implementation Method 1
the connection nipple is made of plastic, especially of an elastomer or soft-elastic thermoplastic. As a result, an axial offset and an angle offset can be compensated in a simple manner.
Data Source
AI summary
The invention relates to a vacuum pump comprising a cup-shaped housing, a rotor eccentrically mounted for rotation in the housing, and a housing cover closing the cup-shaped housing, wherein the rotor has a rotor shaft that passes through the cup-shaped housing and by which the rotor is driven, wherein the rotor shaft is provided with a bore for delivering a lubricant, and a connection nipple is seated in the free end section of the bore.