Vacuum Pump Piping Structure With Elastic Displacement Absorption
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Solution Overview
Problem
Vacuum pumps face issues with gas leakage due to misalignment of piping components during rotation, as existing solutions like Japanese Patent No. 4484470 only address displacement at the inlet port, neglecting other piping ports like outlet and purge ports.
Innovation Solution
Incorporating an elastic portion in the piping structural portion of the vacuum pump, which can elastically deform to absorb positional deviations, thereby limiting damage and gas leakage, even when the pump is displaced in the rotation direction. This elastic portion can be part of a bellows structure or an elastic component sandwiched between piping and the casing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid piping structure is used, then structural strength is improved, but positional deviation occurs during rotor collision causing gas leakage
Solution Approach 1:
The piping structural portion is designed to be movable relative to the casing, allowing it to dynamically adjust its position during rotor collision to maintain gas tightness while accommodating the impact force
Solution Approach 2:
The piping structural portion acts as a flexible element that can deform elastically during rotor collision, absorbing the impact while maintaining the vacuum seal, similar to how flexible membranes absorb shocks
2Manufacturing precision
If the piping structural portion is fixed to the casing, then manufacturing precision is improved, but damage occurs to external piping components during rotor collision
Solution Approach 1:
The movable piping structural portion serves as a cushioning mechanism that absorbs the impact energy from rotor collision before it can be transmitted to the external piping components, preventing damage in advance
3Device complexity
If the piping structural portion is rigidly connected, then device complexity is reduced, but gas leakage occurs during rotor displacement
Solution Approach 1:
The piping structural portion is designed with movable connection to the casing, allowing it to shift position during rotor collision while maintaining gas tightness, balancing simplicity with reliability
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 elastic deformation of the piping structural portion effectively limits positional deviations and gas leakage, reducing damage to connected components and maintaining a stable vacuum environment by absorbing displacements in various directions, including those not aligned with the rotor's rotation direction.
Implementation Method 1
at least a part of the piping structural portion includes an elastic portion that is configured to elastically deform to absorb a displacement
Data Source
AI summary
A vacuum pump and a piping structural portion for a vacuum pump are provided that limit damage to a component connected to external piping and limit gas leakage even when the vacuum pump is displaced in a rotation direction due to damage to the vacuum pump. The vacuum pump draws in gas through an inlet port by rotation of a rotor and includes a casing, which rotatably houses the rotor, and a piping structural portion disposed in the casing. At least a part of the piping structural portion includes an elastic portion that is configured to elastically deform to absorb a displacement.