Vacuum Scroll Pump Counterbalancing Chamber for Axial Load Offset
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Solution Overview
Problem
Vacuum scroll pumps face issues with axial loads on the orbiting plate scroll, which can lead to complex bearing architectures and reduced bearing life due to reversing axial gas loads, necessitating a solution to counteract these forces and extend bearing longevity.
Innovation Solution
The implementation of a vacuum scroll pump design that includes a counterbalancing chamber and gas bypass passage, utilizing a spring-loaded check valve to offset axial loads, and a tubular bellows to manage pressure, along with a pressure relief valve to prevent overcompensation, allowing for a simpler bearing architecture and prolonged bearing life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional scroll pump design is used, then the pump can operate, but axial loads on the orbiting plate scroll cause complex bearing architecture and reduced bearing life
Solution Approach 1:
The patent applies counterbalancing features including a counterbalancing chamber and spring-loaded check valve that generate opposing forces to neutralize the axial gas loads acting on the orbiting plate scroll. This counterweight approach eliminates the need for complex bearing architectures designed to handle reversing axial loads, thereby extending bearing life while maintaining operational reliability
2Device complexity
If axial loads are not counteracted, then the bearing architecture must be complex to handle reversing axial gas loads, but counterbalancing features simplify the bearing architecture
Solution Approach 1:
By introducing counterbalancing features that generate forces opposite to the axial gas loads, the patent enables the use of simpler bearing architectures. The counterbalancing chamber and spring-loaded check valve system neutralizes reversing axial loads, allowing for easier manufacturing and maintenance of the bearing system
3Duration of action of moving object
If counterbalancing features are added, then bearing life is extended, but the device complexity increases
Solution Approach 1:
The counterbalancing chamber and spring-loaded check valve create a relatively simple counterweight mechanism that generates forces to neutralize axial gas loads. This approach extends bearing useful life by eliminating reversing axial loads while adding minimal complexity to the overall pump system
Solution Approach 2:
The spring-loaded check valve acts as an intermediary component that controls gas flow between the compression stage and counterbalancing chamber. This mediator enables the counterbalancing function while maintaining a relatively simple device architecture that does not significantly increase overall system complexity
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 effectively counteracts axial loads on the orbiting plate scroll, reducing the stress on bearings, thereby increasing their lifespan and allowing for a more straightforward bearing architecture, leading to improved operational efficiency and longer useful life.
Implementation Method 1
spring-loaded check valve to offset axial loads
Implementation Method 2
counterbalancing chamber and gas bypass passage, utilizing a spring-loaded check valve to offset axial loads
Data Source
AI summary
A vacuum scroll pump has a frame, a stationary plate scroll fixed to the frame, an orbiting plate scroll, an eccentric drive mechanism for driving the orbiting plate scroll, and counterbalancing features by which axial loads produced on the eccentric drive mechanism are offset. Scroll blades of the stationary and orbiting plate scrolls are nested to define pockets which constitute a compression stage between opposing front sides of plates of the stationary and orbiting plate scrolls. The counterbalancing features include an axial counterbalancing chamber defined at a back side of the plate of the orbiting plate scroll, i.e., opposite the side at which the compression stage is provided, and a mechanism by which an intermediate one of the pockets can be placed in communication with the counterbalancing chamber through the plate of the orbiting plate scroll.