Oil-Tight Motor Jacket for Vacuum Pump Oil Leak Containment
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Solution Overview
Problem
Conventional vacuum pumping systems using rotary vane vacuum pumps suffer from oil leaks due to the use of expensive dynamic seals, which are prone to failure and increase operational costs.
Innovation Solution
A vacuum pumping system with an oil-lubricated vacuum pump that incorporates an oil-tight unit, such as a cylindrical jacket or disc-shaped components made of non-metallic, oil-resistant resin, to collect and contain any oil leaks, eliminating the need for dynamic seals and reducing noise and vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dynamic seals are used to prevent oil leaks, then sealing effectiveness is improved, but reliability deteriorates due to seal failure and high operational costs
Solution Approach 1:
The invention extracts and eliminates the dynamic seal component from the system by providing direct oil-tight engagement between the motor casing and pump casing through interlocking sealing surfaces. This removes the failure-prone dynamic seal while maintaining oil leakage prevention.
Solution Approach 2:
The invention merges the sealing function into the structural connection between motor and pump casings. The motor casing and pump casing are directly coupled with integrated sealing surfaces, combining mechanical support and sealing functions into a single robust structure.
2Reliability
If dynamic seals are used to prevent oil leaks, then sealing effectiveness is improved, but device complexity increases due to expensive seal components
Solution Approach 1:
The invention extracts and eliminates the dynamic seal component from the system by providing direct oil-tight engagement between the motor casing and pump casing through interlocking sealing surfaces. This removes the failure-prone dynamic seal while maintaining oil leakage prevention.
Solution Approach 2:
The invention merges the sealing function into the structural connection between motor and pump casings. The motor casing and pump casing are directly coupled with integrated sealing surfaces, combining mechanical support and sealing functions into a single robust structure.
3Temperature
If additional air gaps are provided for thermal expansion, then thermal management is improved, but device complexity increases
Solution Approach 1:
The invention merges the thermal expansion accommodation function into the existing motor air gap structure. The motor air gap serves dual purposes: providing thermal management space and accommodating thermal expansion, eliminating the need for separate structural provisions.
Solution Approach 2:
The motor air gap is designed to perform multiple functions simultaneously: thermal management, thermal expansion accommodation, and mechanical clearance. This multi-functionality reduces overall device complexity while maintaining thermal performance.
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 system effectively prevents oil leaks, reduces costs, and enhances thermal dissipation and cooling efficiency by using a resin-based container that does not require additional air gaps for thermal expansion, thus improving overall system performance.
Implementation Method 1
an oil-tight unit arranged to enclose at least a portion of the motor rotor and forming at least part of a container intended to collect and keep inside the motor any oil leaking from the pump
Implementation Method 2
enhances thermal dissipation and cooling efficiency by using a resin-based container that does not require additional air gaps for thermal expansion
Data Source
AI summary
A vacuum pumping system includes an oil-lubricated vacuum pump, including a stationary pump stator and a rotatable pump rotor, and a motor, including a stationary motor stator and a rotatable motor rotor cooperating with each other for driving in rotation the pump rotor. The motor further includes an oil-tight unit including a metal jacket enclosing the motor rotor and forming a container intended to collect and keep inside the motor any oil leaking from the pump.