Vacuum Pump Outlet Port Offset for Blade Fragment Containment
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Solution Overview
Problem
Existing vacuum pumps are prone to rotor blade breakage, which can cause broken pieces to scatter from the outlet port, potentially damaging downstream equipment and leading to pressure loss and reduced exhaust performance.
Innovation Solution
The vacuum pump design includes a rotor blade configured to rotate about a vertical axis, with an outlet port positioned offset from the gas exit portion of the rotor blade in the direction of the vertical axis, allowing gas to be exhausted radially and reducing the likelihood of broken pieces scattering from the outlet port.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outlet port is provided at the same height position as the gas exit portion of the rotor blade, then the structure is simple, but broken pieces of the rotor blade may scatter from the outlet port and damage downstream equipment
Solution Approach 1:
The outlet port is positioned at a different height (vertical dimension) than the gas exit portion of the rotor blade. Specifically, the upper end of the outlet port is offset downward from the lower end of the gas exit portion by a predetermined distance. This spatial separation in the vertical dimension prevents broken rotor blade pieces from scattering through the outlet port while maintaining structural simplicity.
2Reliability
If the outlet port is positioned offset from the gas exit portion in the vertical axis direction, then broken pieces are less likely to scatter, but the gas flow path becomes more complex causing pressure loss
Solution Approach 1:
The outlet port is positioned at a different height (vertical dimension) than the gas exit portion of the rotor blade. Specifically, the upper end of the outlet port is offset downward from the lower end of the gas exit portion by a predetermined distance. This spatial separation in the vertical dimension prevents broken rotor blade pieces from scattering through the outlet port while maintaining structural simplicity.
Solution Approach 2:
An annular flow passage is introduced as an intermediary structure to guide the gas flow from the gas exit portion of the rotor blade to the outlet port. This flow passage smoothly transitions the gas flow direction and maintains efficient flow characteristics despite the vertical offset between the gas exit portion and the outlet port, thereby minimizing pressure loss.
3Productivity
If the outlet port is provided at the same height as the gas exit portion, then the exhaust structure is simple, but pressure loss occurs due to misalignment with the velocity vector of the gas
Solution Approach 1:
An annular flow passage is introduced as an intermediary structure to guide the gas flow from the gas exit portion of the rotor blade to the outlet port. This flow passage smoothly transitions the gas flow direction and maintains efficient flow characteristics despite the vertical offset between the gas exit portion and the outlet port, thereby minimizing pressure loss.
Solution Approach 2:
The outlet port is positioned at a different height (vertical dimension) than the gas exit portion of the rotor blade. Specifically, the upper end of the outlet port is offset downward from the lower end of the gas exit portion by a predetermined distance. This spatial separation in the vertical dimension prevents broken rotor blade pieces from scattering through the outlet port while maintaining structural simplicity.
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 configuration effectively prevents broken rotor blade pieces from scattering into the outlet port, enhancing the reliability of the vacuum pump and improving its exhaust performance by minimizing pressure loss.
Implementation Method 1
a rotor blade (103) configured to rotate about a vertical axis (CL)... the vacuum pump is configured to exhaust sucked gas in a radial direction of the rotor blade (103) by rotation of the rotor blade (103)
Data Source
AI summary
A vacuum pump is provided with which, even in the event of breakage of a rotor blade, broken pieces of the rotor blade are unlikely to scatter from an outlet port. A vacuum pump includes a rotor blade configured to rotate about a vertical axis and a casing housing the rotor blade, and is configured to exhaust sucked gas in a radial direction of the rotor blade by rotation of the rotor blade. An outlet port for the gas is provided at a position that is offset from a position of a gas exit portion of the rotor blade in a direction of the vertical axis.